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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
76#include <linux/sched/signal.h>
77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/vmalloc.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
89#include <linux/mutex.h>
90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
97#include <linux/workqueue.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101#include <linux/notifier.h>
102#include <linux/device.h>
103#include <linux/io.h>
104#include <linux/uaccess.h>
105#include <linux/kdb.h>
106#include <linux/ctype.h>
107#include <linux/bsearch.h>
108#include <linux/gcd.h>
109
110#define MAX_NR_CON_DRIVER 16
111
112#define CON_DRIVER_FLAG_MODULE 1
113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
115#define CON_DRIVER_FLAG_ZOMBIE 8
116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128const struct consw *conswitchp;
129
130/*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133#define DEFAULT_BELL_PITCH 750
134#define DEFAULT_BELL_DURATION (HZ/8)
135#define DEFAULT_CURSOR_BLINK_MS 200
136
137struct vc vc_cons [MAX_NR_CONSOLES];
138EXPORT_SYMBOL(vc_cons);
139
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141
142static int con_open(struct tty_struct *, struct file *);
143static void vc_init(struct vc_data *vc, int do_clear);
144static void gotoxy(struct vc_data *vc, int new_x, int new_y);
145static void save_cur(struct vc_data *vc);
146static void reset_terminal(struct vc_data *vc, int do_clear);
147static void con_flush_chars(struct tty_struct *tty);
148static int set_vesa_blanking(char __user *p);
149static void set_cursor(struct vc_data *vc);
150static void hide_cursor(struct vc_data *vc);
151static void console_callback(struct work_struct *ignored);
152static void con_driver_unregister_callback(struct work_struct *ignored);
153static void blank_screen_t(struct timer_list *unused);
154static void set_palette(struct vc_data *vc);
155static void unblank_screen(void);
156
157#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
159int default_utf8 = true;
160module_param(default_utf8, int, S_IRUGO | S_IWUSR);
161int global_cursor_default = -1;
162module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
163EXPORT_SYMBOL(global_cursor_default);
164
165static int cur_default = CUR_UNDERLINE;
166module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168/*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172static int ignore_poke;
173
174int do_poke_blanked_console;
175int console_blanked;
176EXPORT_SYMBOL(console_blanked);
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179static int vesa_off_interval;
180static int blankinterval;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192int fg_console;
193EXPORT_SYMBOL(fg_console);
194int last_console;
195int want_console = -1;
196
197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
201static int saved_console_blanked;
202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
228EXPORT_SYMBOL(console_blank_hook);
229
230static DEFINE_TIMER(console_timer, blank_screen_t);
231static int blank_state;
232static int blank_timer_expired;
233enum {
234 blank_off = 0,
235 blank_normal_wait,
236 blank_vesa_wait,
237};
238
239/*
240 * /sys/class/tty/tty0/
241 *
242 * the attribute 'active' contains the name of the current vc
243 * console and it supports poll() to detect vc switches
244 */
245static struct device *tty0dev;
246
247/*
248 * Notifier list for console events.
249 */
250static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252int register_vt_notifier(struct notifier_block *nb)
253{
254 return atomic_notifier_chain_register(&vt_notifier_list, nb);
255}
256EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258int unregister_vt_notifier(struct notifier_block *nb)
259{
260 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
261}
262EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264static void notify_write(struct vc_data *vc, unsigned int unicode)
265{
266 struct vt_notifier_param param = { .vc = vc, .c = unicode };
267 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
268}
269
270static void notify_update(struct vc_data *vc)
271{
272 struct vt_notifier_param param = { .vc = vc };
273 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
274}
275/*
276 * Low-Level Functions
277 */
278
279static inline bool con_is_fg(const struct vc_data *vc)
280{
281 return vc->vc_num == fg_console;
282}
283
284static inline bool con_should_update(const struct vc_data *vc)
285{
286 return con_is_visible(vc) && !console_blanked;
287}
288
289static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
290 bool viewed)
291{
292 unsigned short *p;
293
294 if (!viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
298 else
299 p = vc->vc_sw->con_screen_pos(vc, offset);
300 return p;
301}
302
303/* Called from the keyboard irq path.. */
304static inline void scrolldelta(int lines)
305{
306 /* FIXME */
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
309 scrollback_delta += lines;
310 schedule_console_callback();
311}
312
313void schedule_console_callback(void)
314{
315 schedule_work(&console_work);
316}
317
318/*
319 * Code to manage unicode-based screen buffers
320 */
321
322/*
323 * Our screen buffer is preceded by an array of line pointers so that
324 * scrolling only implies some pointer shuffling.
325 */
326
327static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
328{
329 u32 **uni_lines;
330 void *p;
331 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
332
333 /* allocate everything in one go */
334 memsize = col_size * rows;
335 memsize += rows * sizeof(*uni_lines);
336 uni_lines = vzalloc(memsize);
337 if (!uni_lines)
338 return NULL;
339
340 /* initial line pointers */
341 p = uni_lines + rows;
342 for (i = 0; i < rows; i++) {
343 uni_lines[i] = p;
344 p += col_size;
345 }
346
347 return uni_lines;
348}
349
350static void vc_uniscr_free(u32 **uni_lines)
351{
352 vfree(uni_lines);
353}
354
355static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
356{
357 vc_uniscr_free(vc->vc_uni_lines);
358 vc->vc_uni_lines = new_uni_lines;
359}
360
361static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
362{
363 if (vc->vc_uni_lines)
364 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
365}
366
367static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
368{
369 if (vc->vc_uni_lines) {
370 u32 *ln = vc->vc_uni_lines[vc->state.y];
371 unsigned int x = vc->state.x, cols = vc->vc_cols;
372
373 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
374 memset32(&ln[x], ' ', nr);
375 }
376}
377
378static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
379{
380 if (vc->vc_uni_lines) {
381 u32 *ln = vc->vc_uni_lines[vc->state.y];
382 unsigned int x = vc->state.x, cols = vc->vc_cols;
383
384 memmove(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
385 memset32(&ln[cols - nr], ' ', nr);
386 }
387}
388
389static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
390 unsigned int nr)
391{
392 if (vc->vc_uni_lines)
393 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
394}
395
396static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
397 unsigned int nr)
398{
399 if (vc->vc_uni_lines)
400 while (nr--)
401 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
402}
403
404/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
405static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
406{
407 unsigned int gcd_idx;
408
409 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
410 u32 *gcd_idx_val = array[gcd_idx];
411 unsigned int dst_idx = gcd_idx;
412
413 while (1) {
414 unsigned int src_idx = (dst_idx + nr) % size;
415 if (src_idx == gcd_idx)
416 break;
417
418 array[dst_idx] = array[src_idx];
419 dst_idx = src_idx;
420 }
421
422 array[dst_idx] = gcd_idx_val;
423 }
424}
425
426static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
427 unsigned int bottom, enum con_scroll dir,
428 unsigned int nr)
429{
430 u32 **uni_lines = vc->vc_uni_lines;
431 unsigned int size = bottom - top;
432
433 if (!uni_lines)
434 return;
435
436 if (dir == SM_DOWN) {
437 juggle_array(&uni_lines[top], size, size - nr);
438 vc_uniscr_clear_lines(vc, top, nr);
439 } else {
440 juggle_array(&uni_lines[top], size, nr);
441 vc_uniscr_clear_lines(vc, bottom - nr, nr);
442 }
443}
444
445static void vc_uniscr_copy_area(u32 **dst_lines,
446 unsigned int dst_cols,
447 unsigned int dst_rows,
448 u32 **src_lines,
449 unsigned int src_cols,
450 unsigned int src_top_row,
451 unsigned int src_bot_row)
452{
453 unsigned int dst_row = 0;
454
455 if (!dst_lines)
456 return;
457
458 while (src_top_row < src_bot_row) {
459 u32 *src_line = src_lines[src_top_row];
460 u32 *dst_line = dst_lines[dst_row];
461
462 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
463 if (dst_cols - src_cols)
464 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
465 src_top_row++;
466 dst_row++;
467 }
468 while (dst_row < dst_rows) {
469 u32 *dst_line = dst_lines[dst_row];
470
471 memset32(dst_line, ' ', dst_cols);
472 dst_row++;
473 }
474}
475
476/*
477 * Called from vcs_read() to make sure unicode screen retrieval is possible.
478 * This will initialize the unicode screen buffer if not already done.
479 * This returns 0 if OK, or a negative error code otherwise.
480 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
481 */
482int vc_uniscr_check(struct vc_data *vc)
483{
484 u32 **uni_lines;
485 unsigned short *p;
486 int x, y, mask;
487
488 WARN_CONSOLE_UNLOCKED();
489
490 if (!vc->vc_utf)
491 return -ENODATA;
492
493 if (vc->vc_uni_lines)
494 return 0;
495
496 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
497 if (!uni_lines)
498 return -ENOMEM;
499
500 /*
501 * Let's populate it initially with (imperfect) reverse translation.
502 * This is the next best thing we can do short of having it enabled
503 * from the start even when no users rely on this functionality. True
504 * unicode content will be available after a complete screen refresh.
505 */
506 p = (unsigned short *)vc->vc_origin;
507 mask = vc->vc_hi_font_mask | 0xff;
508 for (y = 0; y < vc->vc_rows; y++) {
509 u32 *line = uni_lines[y];
510 for (x = 0; x < vc->vc_cols; x++) {
511 u16 glyph = scr_readw(p++) & mask;
512 line[x] = inverse_translate(vc, glyph, true);
513 }
514 }
515
516 vc->vc_uni_lines = uni_lines;
517
518 return 0;
519}
520
521/*
522 * Called from vcs_read() to get the unicode data from the screen.
523 * This must be preceded by a successful call to vc_uniscr_check() once
524 * the console lock has been taken.
525 */
526void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
527 unsigned int row, unsigned int col, unsigned int nr)
528{
529 u32 **uni_lines = vc->vc_uni_lines;
530 int offset = row * vc->vc_size_row + col * 2;
531 unsigned long pos;
532
533 if (WARN_ON_ONCE(!uni_lines))
534 return;
535
536 pos = (unsigned long)screenpos(vc, offset, viewed);
537 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
538 /*
539 * Desired position falls in the main screen buffer.
540 * However the actual row/col might be different if
541 * scrollback is active.
542 */
543 row = (pos - vc->vc_origin) / vc->vc_size_row;
544 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
545 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
546 } else {
547 /*
548 * Scrollback is active. For now let's simply backtranslate
549 * the screen glyphs until the unicode screen buffer does
550 * synchronize with console display drivers for a scrollback
551 * buffer of its own.
552 */
553 u16 *p = (u16 *)pos;
554 int mask = vc->vc_hi_font_mask | 0xff;
555 u32 *uni_buf = dest;
556 while (nr--) {
557 u16 glyph = scr_readw(p++) & mask;
558 *uni_buf++ = inverse_translate(vc, glyph, true);
559 }
560 }
561}
562
563static void con_scroll(struct vc_data *vc, unsigned int top,
564 unsigned int bottom, enum con_scroll dir,
565 unsigned int nr)
566{
567 unsigned int rows = bottom - top;
568 u16 *clear, *dst, *src;
569
570 if (top + nr >= bottom)
571 nr = rows - 1;
572 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
573 return;
574
575 vc_uniscr_scroll(vc, top, bottom, dir, nr);
576 if (con_is_visible(vc) &&
577 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
578 return;
579
580 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
581 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
582
583 if (dir == SM_UP) {
584 clear = src + (rows - nr) * vc->vc_cols;
585 swap(src, dst);
586 }
587 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
588 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
589}
590
591static void do_update_region(struct vc_data *vc, unsigned long start, int count)
592{
593 unsigned int xx, yy, offset;
594 u16 *p;
595
596 p = (u16 *) start;
597 if (!vc->vc_sw->con_getxy) {
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
601 } else {
602 int nxx, nyy;
603 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
604 xx = nxx; yy = nyy;
605 }
606 for(;;) {
607 u16 attrib = scr_readw(p) & 0xff00;
608 int startx = xx;
609 u16 *q = p;
610 while (xx < vc->vc_cols && count) {
611 if (attrib != (scr_readw(p) & 0xff00)) {
612 if (p > q)
613 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
614 startx = xx;
615 q = p;
616 attrib = scr_readw(p) & 0xff00;
617 }
618 p++;
619 xx++;
620 count--;
621 }
622 if (p > q)
623 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
624 if (!count)
625 break;
626 xx = 0;
627 yy++;
628 if (vc->vc_sw->con_getxy) {
629 p = (u16 *)start;
630 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
631 }
632 }
633}
634
635void update_region(struct vc_data *vc, unsigned long start, int count)
636{
637 WARN_CONSOLE_UNLOCKED();
638
639 if (con_should_update(vc)) {
640 hide_cursor(vc);
641 do_update_region(vc, start, count);
642 set_cursor(vc);
643 }
644}
645EXPORT_SYMBOL(update_region);
646
647/* Structure of attributes is hardware-dependent */
648
649static u8 build_attr(struct vc_data *vc, u8 _color,
650 enum vc_intensity _intensity, bool _blink, bool _underline,
651 bool _reverse, bool _italic)
652{
653 if (vc->vc_sw->con_build_attr)
654 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
655 _blink, _underline, _reverse, _italic);
656
657/*
658 * ++roman: I completely changed the attribute format for monochrome
659 * mode (!can_do_color). The formerly used MDA (monochrome display
660 * adapter) format didn't allow the combination of certain effects.
661 * Now the attribute is just a bit vector:
662 * Bit 0..1: intensity (0..2)
663 * Bit 2 : underline
664 * Bit 3 : reverse
665 * Bit 7 : blink
666 */
667 {
668 u8 a = _color;
669 if (!vc->vc_can_do_color)
670 return _intensity |
671 (_italic << 1) |
672 (_underline << 2) |
673 (_reverse << 3) |
674 (_blink << 7);
675 if (_italic)
676 a = (a & 0xF0) | vc->vc_itcolor;
677 else if (_underline)
678 a = (a & 0xf0) | vc->vc_ulcolor;
679 else if (_intensity == VCI_HALF_BRIGHT)
680 a = (a & 0xf0) | vc->vc_halfcolor;
681 if (_reverse)
682 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
683 if (_blink)
684 a ^= 0x80;
685 if (_intensity == VCI_BOLD)
686 a ^= 0x08;
687 if (vc->vc_hi_font_mask == 0x100)
688 a <<= 1;
689 return a;
690 }
691}
692
693static void update_attr(struct vc_data *vc)
694{
695 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
696 vc->state.blink, vc->state.underline,
697 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
698 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
699 VCI_NORMAL, vc->state.blink, false,
700 vc->vc_decscnm, false) << 8);
701}
702
703/* Note: inverting the screen twice should revert to the original state */
704void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
705{
706 unsigned short *p;
707
708 WARN_CONSOLE_UNLOCKED();
709
710 count /= 2;
711 p = screenpos(vc, offset, viewed);
712 if (vc->vc_sw->con_invert_region) {
713 vc->vc_sw->con_invert_region(vc, p, count);
714 } else {
715 u16 *q = p;
716 int cnt = count;
717 u16 a;
718
719 if (!vc->vc_can_do_color) {
720 while (cnt--) {
721 a = scr_readw(q);
722 a ^= 0x0800;
723 scr_writew(a, q);
724 q++;
725 }
726 } else if (vc->vc_hi_font_mask == 0x100) {
727 while (cnt--) {
728 a = scr_readw(q);
729 a = (a & 0x11ff) |
730 ((a & 0xe000) >> 4) |
731 ((a & 0x0e00) << 4);
732 scr_writew(a, q);
733 q++;
734 }
735 } else {
736 while (cnt--) {
737 a = scr_readw(q);
738 a = (a & 0x88ff) |
739 ((a & 0x7000) >> 4) |
740 ((a & 0x0700) << 4);
741 scr_writew(a, q);
742 q++;
743 }
744 }
745 }
746
747 if (con_should_update(vc))
748 do_update_region(vc, (unsigned long) p, count);
749 notify_update(vc);
750}
751
752/* used by selection: complement pointer position */
753void complement_pos(struct vc_data *vc, int offset)
754{
755 static int old_offset = -1;
756 static unsigned short old;
757 static unsigned short oldx, oldy;
758
759 WARN_CONSOLE_UNLOCKED();
760
761 if (old_offset != -1 && old_offset >= 0 &&
762 old_offset < vc->vc_screenbuf_size) {
763 scr_writew(old, screenpos(vc, old_offset, true));
764 if (con_should_update(vc))
765 vc->vc_sw->con_putc(vc, old, oldy, oldx);
766 notify_update(vc);
767 }
768
769 old_offset = offset;
770
771 if (offset != -1 && offset >= 0 &&
772 offset < vc->vc_screenbuf_size) {
773 unsigned short new;
774 unsigned short *p;
775 p = screenpos(vc, offset, true);
776 old = scr_readw(p);
777 new = old ^ vc->vc_complement_mask;
778 scr_writew(new, p);
779 if (con_should_update(vc)) {
780 oldx = (offset >> 1) % vc->vc_cols;
781 oldy = (offset >> 1) / vc->vc_cols;
782 vc->vc_sw->con_putc(vc, new, oldy, oldx);
783 }
784 notify_update(vc);
785 }
786}
787
788static void insert_char(struct vc_data *vc, unsigned int nr)
789{
790 unsigned short *p = (unsigned short *) vc->vc_pos;
791
792 vc_uniscr_insert(vc, nr);
793 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
794 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
795 vc->vc_need_wrap = 0;
796 if (con_should_update(vc))
797 do_update_region(vc, (unsigned long) p,
798 vc->vc_cols - vc->state.x);
799}
800
801static void delete_char(struct vc_data *vc, unsigned int nr)
802{
803 unsigned short *p = (unsigned short *) vc->vc_pos;
804
805 vc_uniscr_delete(vc, nr);
806 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
807 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
808 nr * 2);
809 vc->vc_need_wrap = 0;
810 if (con_should_update(vc))
811 do_update_region(vc, (unsigned long) p,
812 vc->vc_cols - vc->state.x);
813}
814
815static int softcursor_original = -1;
816
817static void add_softcursor(struct vc_data *vc)
818{
819 int i = scr_readw((u16 *) vc->vc_pos);
820 u32 type = vc->vc_cursor_type;
821
822 if (!(type & CUR_SW))
823 return;
824 if (softcursor_original != -1)
825 return;
826 softcursor_original = i;
827 i |= CUR_SET(type);
828 i ^= CUR_CHANGE(type);
829 if ((type & CUR_ALWAYS_BG) &&
830 (softcursor_original & CUR_BG) == (i & CUR_BG))
831 i ^= CUR_BG;
832 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
833 i ^= CUR_FG;
834 scr_writew(i, (u16 *)vc->vc_pos);
835 if (con_should_update(vc))
836 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
837}
838
839static void hide_softcursor(struct vc_data *vc)
840{
841 if (softcursor_original != -1) {
842 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
843 if (con_should_update(vc))
844 vc->vc_sw->con_putc(vc, softcursor_original,
845 vc->state.y, vc->state.x);
846 softcursor_original = -1;
847 }
848}
849
850static void hide_cursor(struct vc_data *vc)
851{
852 if (vc_is_sel(vc))
853 clear_selection();
854
855 vc->vc_sw->con_cursor(vc, CM_ERASE);
856 hide_softcursor(vc);
857}
858
859static void set_cursor(struct vc_data *vc)
860{
861 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
862 return;
863 if (vc->vc_deccm) {
864 if (vc_is_sel(vc))
865 clear_selection();
866 add_softcursor(vc);
867 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
868 vc->vc_sw->con_cursor(vc, CM_DRAW);
869 } else
870 hide_cursor(vc);
871}
872
873static void set_origin(struct vc_data *vc)
874{
875 WARN_CONSOLE_UNLOCKED();
876
877 if (!con_is_visible(vc) ||
878 !vc->vc_sw->con_set_origin ||
879 !vc->vc_sw->con_set_origin(vc))
880 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
881 vc->vc_visible_origin = vc->vc_origin;
882 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
883 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
884 2 * vc->state.x;
885}
886
887static void save_screen(struct vc_data *vc)
888{
889 WARN_CONSOLE_UNLOCKED();
890
891 if (vc->vc_sw->con_save_screen)
892 vc->vc_sw->con_save_screen(vc);
893}
894
895static void flush_scrollback(struct vc_data *vc)
896{
897 WARN_CONSOLE_UNLOCKED();
898
899 set_origin(vc);
900 if (vc->vc_sw->con_flush_scrollback) {
901 vc->vc_sw->con_flush_scrollback(vc);
902 } else if (con_is_visible(vc)) {
903 /*
904 * When no con_flush_scrollback method is provided then the
905 * legacy way for flushing the scrollback buffer is to use
906 * a side effect of the con_switch method. We do it only on
907 * the foreground console as background consoles have no
908 * scrollback buffers in that case and we obviously don't
909 * want to switch to them.
910 */
911 hide_cursor(vc);
912 vc->vc_sw->con_switch(vc);
913 set_cursor(vc);
914 }
915}
916
917/*
918 * Redrawing of screen
919 */
920
921void clear_buffer_attributes(struct vc_data *vc)
922{
923 unsigned short *p = (unsigned short *)vc->vc_origin;
924 int count = vc->vc_screenbuf_size / 2;
925 int mask = vc->vc_hi_font_mask | 0xff;
926
927 for (; count > 0; count--, p++) {
928 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
929 }
930}
931
932void redraw_screen(struct vc_data *vc, int is_switch)
933{
934 int redraw = 0;
935
936 WARN_CONSOLE_UNLOCKED();
937
938 if (!vc) {
939 /* strange ... */
940 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
941 return;
942 }
943
944 if (is_switch) {
945 struct vc_data *old_vc = vc_cons[fg_console].d;
946 if (old_vc == vc)
947 return;
948 if (!con_is_visible(vc))
949 redraw = 1;
950 *vc->vc_display_fg = vc;
951 fg_console = vc->vc_num;
952 hide_cursor(old_vc);
953 if (!con_is_visible(old_vc)) {
954 save_screen(old_vc);
955 set_origin(old_vc);
956 }
957 if (tty0dev)
958 sysfs_notify(&tty0dev->kobj, NULL, "active");
959 } else {
960 hide_cursor(vc);
961 redraw = 1;
962 }
963
964 if (redraw) {
965 int update;
966 int old_was_color = vc->vc_can_do_color;
967
968 set_origin(vc);
969 update = vc->vc_sw->con_switch(vc);
970 set_palette(vc);
971 /*
972 * If console changed from mono<->color, the best we can do
973 * is to clear the buffer attributes. As it currently stands,
974 * rebuilding new attributes from the old buffer is not doable
975 * without overly complex code.
976 */
977 if (old_was_color != vc->vc_can_do_color) {
978 update_attr(vc);
979 clear_buffer_attributes(vc);
980 }
981
982 if (update && vc->vc_mode != KD_GRAPHICS)
983 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
984 }
985 set_cursor(vc);
986 if (is_switch) {
987 vt_set_leds_compute_shiftstate();
988 notify_update(vc);
989 }
990}
991EXPORT_SYMBOL(redraw_screen);
992
993/*
994 * Allocation, freeing and resizing of VTs.
995 */
996
997int vc_cons_allocated(unsigned int i)
998{
999 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1000}
1001
1002static void visual_init(struct vc_data *vc, int num, int init)
1003{
1004 /* ++Geert: vc->vc_sw->con_init determines console size */
1005 if (vc->vc_sw)
1006 module_put(vc->vc_sw->owner);
1007 vc->vc_sw = conswitchp;
1008
1009 if (con_driver_map[num])
1010 vc->vc_sw = con_driver_map[num];
1011
1012 __module_get(vc->vc_sw->owner);
1013 vc->vc_num = num;
1014 vc->vc_display_fg = &master_display_fg;
1015 if (vc->uni_pagedict_loc)
1016 con_free_unimap(vc);
1017 vc->uni_pagedict_loc = &vc->uni_pagedict;
1018 vc->uni_pagedict = NULL;
1019 vc->vc_hi_font_mask = 0;
1020 vc->vc_complement_mask = 0;
1021 vc->vc_can_do_color = 0;
1022 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1023 vc->vc_sw->con_init(vc, init);
1024 if (!vc->vc_complement_mask)
1025 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1026 vc->vc_s_complement_mask = vc->vc_complement_mask;
1027 vc->vc_size_row = vc->vc_cols << 1;
1028 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1029}
1030
1031
1032static void visual_deinit(struct vc_data *vc)
1033{
1034 vc->vc_sw->con_deinit(vc);
1035 module_put(vc->vc_sw->owner);
1036}
1037
1038static void vc_port_destruct(struct tty_port *port)
1039{
1040 struct vc_data *vc = container_of(port, struct vc_data, port);
1041
1042 kfree(vc);
1043}
1044
1045static const struct tty_port_operations vc_port_ops = {
1046 .destruct = vc_port_destruct,
1047};
1048
1049/*
1050 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1051 * [this is to be used together with some user program
1052 * like resize that changes the hardware videomode]
1053 */
1054#define VC_MAXCOL (32767)
1055#define VC_MAXROW (32767)
1056
1057int vc_allocate(unsigned int currcons) /* return 0 on success */
1058{
1059 struct vt_notifier_param param;
1060 struct vc_data *vc;
1061 int err;
1062
1063 WARN_CONSOLE_UNLOCKED();
1064
1065 if (currcons >= MAX_NR_CONSOLES)
1066 return -ENXIO;
1067
1068 if (vc_cons[currcons].d)
1069 return 0;
1070
1071 /* due to the granularity of kmalloc, we waste some memory here */
1072 /* the alloc is done in two steps, to optimize the common situation
1073 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1074 /* although the numbers above are not valid since long ago, the
1075 point is still up-to-date and the comment still has its value
1076 even if only as a historical artifact. --mj, July 1998 */
1077 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1078 if (!vc)
1079 return -ENOMEM;
1080
1081 vc_cons[currcons].d = vc;
1082 tty_port_init(&vc->port);
1083 vc->port.ops = &vc_port_ops;
1084 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1085
1086 visual_init(vc, currcons, 1);
1087
1088 if (!*vc->uni_pagedict_loc)
1089 con_set_default_unimap(vc);
1090
1091 err = -EINVAL;
1092 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1093 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1094 goto err_free;
1095 err = -ENOMEM;
1096 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1097 if (!vc->vc_screenbuf)
1098 goto err_free;
1099
1100 /* If no drivers have overridden us and the user didn't pass a
1101 boot option, default to displaying the cursor */
1102 if (global_cursor_default == -1)
1103 global_cursor_default = 1;
1104
1105 vc_init(vc, 1);
1106 vcs_make_sysfs(currcons);
1107 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1108
1109 return 0;
1110err_free:
1111 visual_deinit(vc);
1112 kfree(vc);
1113 vc_cons[currcons].d = NULL;
1114 return err;
1115}
1116
1117static inline int resize_screen(struct vc_data *vc, int width, int height,
1118 int user)
1119{
1120 /* Resizes the resolution of the display adapater */
1121 int err = 0;
1122
1123 if (vc->vc_sw->con_resize)
1124 err = vc->vc_sw->con_resize(vc, width, height, user);
1125
1126 return err;
1127}
1128
1129/**
1130 * vc_do_resize - resizing method for the tty
1131 * @tty: tty being resized
1132 * @vc: virtual console private data
1133 * @cols: columns
1134 * @lines: lines
1135 *
1136 * Resize a virtual console, clipping according to the actual constraints.
1137 * If the caller passes a tty structure then update the termios winsize
1138 * information and perform any necessary signal handling.
1139 *
1140 * Caller must hold the console semaphore. Takes the termios rwsem and
1141 * ctrl.lock of the tty IFF a tty is passed.
1142 */
1143
1144static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1145 unsigned int cols, unsigned int lines)
1146{
1147 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1148 unsigned long end;
1149 unsigned int old_rows, old_row_size, first_copied_row;
1150 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1151 unsigned int user;
1152 unsigned short *oldscreen, *newscreen;
1153 u32 **new_uniscr = NULL;
1154
1155 WARN_CONSOLE_UNLOCKED();
1156
1157 if (!vc)
1158 return -ENXIO;
1159
1160 user = vc->vc_resize_user;
1161 vc->vc_resize_user = 0;
1162
1163 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1164 return -EINVAL;
1165
1166 new_cols = (cols ? cols : vc->vc_cols);
1167 new_rows = (lines ? lines : vc->vc_rows);
1168 new_row_size = new_cols << 1;
1169 new_screen_size = new_row_size * new_rows;
1170
1171 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1172 /*
1173 * This function is being called here to cover the case
1174 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1175 * passing the same fb_var_screeninfo containing the fields
1176 * yres/xres equal to a number non-multiple of vc_font.height
1177 * and yres_virtual/xres_virtual equal to number lesser than the
1178 * vc_font.height and yres/xres.
1179 * In the second call, the struct fb_var_screeninfo isn't
1180 * being modified by the underlying driver because of the
1181 * if above, and this causes the fbcon_display->vrows to become
1182 * negative and it eventually leads to out-of-bound
1183 * access by the imageblit function.
1184 * To give the correct values to the struct and to not have
1185 * to deal with possible errors from the code below, we call
1186 * the resize_screen here as well.
1187 */
1188 return resize_screen(vc, new_cols, new_rows, user);
1189 }
1190
1191 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1192 return -EINVAL;
1193 newscreen = kzalloc(new_screen_size, GFP_USER);
1194 if (!newscreen)
1195 return -ENOMEM;
1196
1197 if (vc->vc_uni_lines) {
1198 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1199 if (!new_uniscr) {
1200 kfree(newscreen);
1201 return -ENOMEM;
1202 }
1203 }
1204
1205 if (vc_is_sel(vc))
1206 clear_selection();
1207
1208 old_rows = vc->vc_rows;
1209 old_row_size = vc->vc_size_row;
1210
1211 err = resize_screen(vc, new_cols, new_rows, user);
1212 if (err) {
1213 kfree(newscreen);
1214 vc_uniscr_free(new_uniscr);
1215 return err;
1216 }
1217
1218 vc->vc_rows = new_rows;
1219 vc->vc_cols = new_cols;
1220 vc->vc_size_row = new_row_size;
1221 vc->vc_screenbuf_size = new_screen_size;
1222
1223 rlth = min(old_row_size, new_row_size);
1224 rrem = new_row_size - rlth;
1225 old_origin = vc->vc_origin;
1226 new_origin = (long) newscreen;
1227 new_scr_end = new_origin + new_screen_size;
1228
1229 if (vc->state.y > new_rows) {
1230 if (old_rows - vc->state.y < new_rows) {
1231 /*
1232 * Cursor near the bottom, copy contents from the
1233 * bottom of buffer
1234 */
1235 first_copied_row = (old_rows - new_rows);
1236 } else {
1237 /*
1238 * Cursor is in no man's land, copy 1/2 screenful
1239 * from the top and bottom of cursor position
1240 */
1241 first_copied_row = (vc->state.y - new_rows/2);
1242 }
1243 old_origin += first_copied_row * old_row_size;
1244 } else
1245 first_copied_row = 0;
1246 end = old_origin + old_row_size * min(old_rows, new_rows);
1247
1248 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1249 vc->vc_uni_lines, rlth/2, first_copied_row,
1250 min(old_rows, new_rows));
1251 vc_uniscr_set(vc, new_uniscr);
1252
1253 update_attr(vc);
1254
1255 while (old_origin < end) {
1256 scr_memcpyw((unsigned short *) new_origin,
1257 (unsigned short *) old_origin, rlth);
1258 if (rrem)
1259 scr_memsetw((void *)(new_origin + rlth),
1260 vc->vc_video_erase_char, rrem);
1261 old_origin += old_row_size;
1262 new_origin += new_row_size;
1263 }
1264 if (new_scr_end > new_origin)
1265 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1266 new_scr_end - new_origin);
1267 oldscreen = vc->vc_screenbuf;
1268 vc->vc_screenbuf = newscreen;
1269 vc->vc_screenbuf_size = new_screen_size;
1270 set_origin(vc);
1271 kfree(oldscreen);
1272
1273 /* do part of a reset_terminal() */
1274 vc->vc_top = 0;
1275 vc->vc_bottom = vc->vc_rows;
1276 gotoxy(vc, vc->state.x, vc->state.y);
1277 save_cur(vc);
1278
1279 if (tty) {
1280 /* Rewrite the requested winsize data with the actual
1281 resulting sizes */
1282 struct winsize ws;
1283 memset(&ws, 0, sizeof(ws));
1284 ws.ws_row = vc->vc_rows;
1285 ws.ws_col = vc->vc_cols;
1286 ws.ws_ypixel = vc->vc_scan_lines;
1287 tty_do_resize(tty, &ws);
1288 }
1289
1290 if (con_is_visible(vc))
1291 update_screen(vc);
1292 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1293 notify_update(vc);
1294 return err;
1295}
1296
1297/**
1298 * vc_resize - resize a VT
1299 * @vc: virtual console
1300 * @cols: columns
1301 * @rows: rows
1302 *
1303 * Resize a virtual console as seen from the console end of things. We
1304 * use the common vc_do_resize methods to update the structures. The
1305 * caller must hold the console sem to protect console internals and
1306 * vc->port.tty
1307 */
1308
1309int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1310{
1311 return vc_do_resize(vc->port.tty, vc, cols, rows);
1312}
1313EXPORT_SYMBOL(vc_resize);
1314
1315/**
1316 * vt_resize - resize a VT
1317 * @tty: tty to resize
1318 * @ws: winsize attributes
1319 *
1320 * Resize a virtual terminal. This is called by the tty layer as we
1321 * register our own handler for resizing. The mutual helper does all
1322 * the actual work.
1323 *
1324 * Takes the console sem and the called methods then take the tty
1325 * termios_rwsem and the tty ctrl.lock in that order.
1326 */
1327static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1328{
1329 struct vc_data *vc = tty->driver_data;
1330 int ret;
1331
1332 console_lock();
1333 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1334 console_unlock();
1335 return ret;
1336}
1337
1338struct vc_data *vc_deallocate(unsigned int currcons)
1339{
1340 struct vc_data *vc = NULL;
1341
1342 WARN_CONSOLE_UNLOCKED();
1343
1344 if (vc_cons_allocated(currcons)) {
1345 struct vt_notifier_param param;
1346
1347 param.vc = vc = vc_cons[currcons].d;
1348 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1349 vcs_remove_sysfs(currcons);
1350 visual_deinit(vc);
1351 con_free_unimap(vc);
1352 put_pid(vc->vt_pid);
1353 vc_uniscr_set(vc, NULL);
1354 kfree(vc->vc_screenbuf);
1355 vc_cons[currcons].d = NULL;
1356 }
1357 return vc;
1358}
1359
1360/*
1361 * VT102 emulator
1362 */
1363
1364enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1365
1366#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1367#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1368#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1369
1370#define decarm VC_REPEAT
1371#define decckm VC_CKMODE
1372#define kbdapplic VC_APPLIC
1373#define lnm VC_CRLF
1374
1375const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1376 8,12,10,14, 9,13,11,15 };
1377EXPORT_SYMBOL(color_table);
1378
1379/* the default colour table, for VGA+ colour systems */
1380unsigned char default_red[] = {
1381 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1382 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1383};
1384module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1385EXPORT_SYMBOL(default_red);
1386
1387unsigned char default_grn[] = {
1388 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1389 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1390};
1391module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1392EXPORT_SYMBOL(default_grn);
1393
1394unsigned char default_blu[] = {
1395 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1396 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1397};
1398module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1399EXPORT_SYMBOL(default_blu);
1400
1401/*
1402 * gotoxy() must verify all boundaries, because the arguments
1403 * might also be negative. If the given position is out of
1404 * bounds, the cursor is placed at the nearest margin.
1405 */
1406static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1407{
1408 int min_y, max_y;
1409
1410 if (new_x < 0)
1411 vc->state.x = 0;
1412 else {
1413 if (new_x >= vc->vc_cols)
1414 vc->state.x = vc->vc_cols - 1;
1415 else
1416 vc->state.x = new_x;
1417 }
1418
1419 if (vc->vc_decom) {
1420 min_y = vc->vc_top;
1421 max_y = vc->vc_bottom;
1422 } else {
1423 min_y = 0;
1424 max_y = vc->vc_rows;
1425 }
1426 if (new_y < min_y)
1427 vc->state.y = min_y;
1428 else if (new_y >= max_y)
1429 vc->state.y = max_y - 1;
1430 else
1431 vc->state.y = new_y;
1432 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1433 (vc->state.x << 1);
1434 vc->vc_need_wrap = 0;
1435}
1436
1437/* for absolute user moves, when decom is set */
1438static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1439{
1440 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1441}
1442
1443void scrollback(struct vc_data *vc)
1444{
1445 scrolldelta(-(vc->vc_rows / 2));
1446}
1447
1448void scrollfront(struct vc_data *vc, int lines)
1449{
1450 if (!lines)
1451 lines = vc->vc_rows / 2;
1452 scrolldelta(lines);
1453}
1454
1455static void lf(struct vc_data *vc)
1456{
1457 /* don't scroll if above bottom of scrolling region, or
1458 * if below scrolling region
1459 */
1460 if (vc->state.y + 1 == vc->vc_bottom)
1461 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1462 else if (vc->state.y < vc->vc_rows - 1) {
1463 vc->state.y++;
1464 vc->vc_pos += vc->vc_size_row;
1465 }
1466 vc->vc_need_wrap = 0;
1467 notify_write(vc, '\n');
1468}
1469
1470static void ri(struct vc_data *vc)
1471{
1472 /* don't scroll if below top of scrolling region, or
1473 * if above scrolling region
1474 */
1475 if (vc->state.y == vc->vc_top)
1476 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1477 else if (vc->state.y > 0) {
1478 vc->state.y--;
1479 vc->vc_pos -= vc->vc_size_row;
1480 }
1481 vc->vc_need_wrap = 0;
1482}
1483
1484static inline void cr(struct vc_data *vc)
1485{
1486 vc->vc_pos -= vc->state.x << 1;
1487 vc->vc_need_wrap = vc->state.x = 0;
1488 notify_write(vc, '\r');
1489}
1490
1491static inline void bs(struct vc_data *vc)
1492{
1493 if (vc->state.x) {
1494 vc->vc_pos -= 2;
1495 vc->state.x--;
1496 vc->vc_need_wrap = 0;
1497 notify_write(vc, '\b');
1498 }
1499}
1500
1501static inline void del(struct vc_data *vc)
1502{
1503 /* ignored */
1504}
1505
1506static void csi_J(struct vc_data *vc, int vpar)
1507{
1508 unsigned int count;
1509 unsigned short * start;
1510
1511 switch (vpar) {
1512 case 0: /* erase from cursor to end of display */
1513 vc_uniscr_clear_line(vc, vc->state.x,
1514 vc->vc_cols - vc->state.x);
1515 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1516 vc->vc_rows - vc->state.y - 1);
1517 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1518 start = (unsigned short *)vc->vc_pos;
1519 break;
1520 case 1: /* erase from start to cursor */
1521 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1522 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1523 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1524 start = (unsigned short *)vc->vc_origin;
1525 break;
1526 case 3: /* include scrollback */
1527 flush_scrollback(vc);
1528 fallthrough;
1529 case 2: /* erase whole display */
1530 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1531 count = vc->vc_cols * vc->vc_rows;
1532 start = (unsigned short *)vc->vc_origin;
1533 break;
1534 default:
1535 return;
1536 }
1537 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1538 if (con_should_update(vc))
1539 do_update_region(vc, (unsigned long) start, count);
1540 vc->vc_need_wrap = 0;
1541}
1542
1543static void csi_K(struct vc_data *vc, int vpar)
1544{
1545 unsigned int count;
1546 unsigned short *start = (unsigned short *)vc->vc_pos;
1547 int offset;
1548
1549 switch (vpar) {
1550 case 0: /* erase from cursor to end of line */
1551 offset = 0;
1552 count = vc->vc_cols - vc->state.x;
1553 break;
1554 case 1: /* erase from start of line to cursor */
1555 offset = -vc->state.x;
1556 count = vc->state.x + 1;
1557 break;
1558 case 2: /* erase whole line */
1559 offset = -vc->state.x;
1560 count = vc->vc_cols;
1561 break;
1562 default:
1563 return;
1564 }
1565 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1566 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1567 vc->vc_need_wrap = 0;
1568 if (con_should_update(vc))
1569 do_update_region(vc, (unsigned long)(start + offset), count);
1570}
1571
1572/* erase the following vpar positions */
1573static void csi_X(struct vc_data *vc, unsigned int vpar)
1574{ /* not vt100? */
1575 unsigned int count;
1576
1577 if (!vpar)
1578 vpar++;
1579
1580 count = min(vpar, vc->vc_cols - vc->state.x);
1581
1582 vc_uniscr_clear_line(vc, vc->state.x, count);
1583 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1584 if (con_should_update(vc))
1585 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1586 vc->vc_need_wrap = 0;
1587}
1588
1589static void default_attr(struct vc_data *vc)
1590{
1591 vc->state.intensity = VCI_NORMAL;
1592 vc->state.italic = false;
1593 vc->state.underline = false;
1594 vc->state.reverse = false;
1595 vc->state.blink = false;
1596 vc->state.color = vc->vc_def_color;
1597}
1598
1599struct rgb { u8 r; u8 g; u8 b; };
1600
1601static void rgb_from_256(int i, struct rgb *c)
1602{
1603 if (i < 8) { /* Standard colours. */
1604 c->r = i&1 ? 0xaa : 0x00;
1605 c->g = i&2 ? 0xaa : 0x00;
1606 c->b = i&4 ? 0xaa : 0x00;
1607 } else if (i < 16) {
1608 c->r = i&1 ? 0xff : 0x55;
1609 c->g = i&2 ? 0xff : 0x55;
1610 c->b = i&4 ? 0xff : 0x55;
1611 } else if (i < 232) { /* 6x6x6 colour cube. */
1612 c->r = (i - 16) / 36 * 85 / 2;
1613 c->g = (i - 16) / 6 % 6 * 85 / 2;
1614 c->b = (i - 16) % 6 * 85 / 2;
1615 } else /* Grayscale ramp. */
1616 c->r = c->g = c->b = i * 10 - 2312;
1617}
1618
1619static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1620{
1621 u8 hue = 0, max = max3(c->r, c->g, c->b);
1622
1623 if (c->r > max / 2)
1624 hue |= 4;
1625 if (c->g > max / 2)
1626 hue |= 2;
1627 if (c->b > max / 2)
1628 hue |= 1;
1629
1630 if (hue == 7 && max <= 0x55) {
1631 hue = 0;
1632 vc->state.intensity = VCI_BOLD;
1633 } else if (max > 0xaa)
1634 vc->state.intensity = VCI_BOLD;
1635 else
1636 vc->state.intensity = VCI_NORMAL;
1637
1638 vc->state.color = (vc->state.color & 0xf0) | hue;
1639}
1640
1641static void rgb_background(struct vc_data *vc, const struct rgb *c)
1642{
1643 /* For backgrounds, err on the dark side. */
1644 vc->state.color = (vc->state.color & 0x0f)
1645 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1646}
1647
1648/*
1649 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1650 * and thus need to be detected and ignored by hand. That standard also
1651 * wants : rather than ; as separators but sequences containing : are currently
1652 * completely ignored by the parser.
1653 *
1654 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1655 * supporting them.
1656 */
1657static int vc_t416_color(struct vc_data *vc, int i,
1658 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1659{
1660 struct rgb c;
1661
1662 i++;
1663 if (i > vc->vc_npar)
1664 return i;
1665
1666 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1667 /* 256 colours */
1668 i++;
1669 rgb_from_256(vc->vc_par[i], &c);
1670 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1671 /* 24 bit */
1672 c.r = vc->vc_par[i + 1];
1673 c.g = vc->vc_par[i + 2];
1674 c.b = vc->vc_par[i + 3];
1675 i += 3;
1676 } else
1677 return i;
1678
1679 set_color(vc, &c);
1680
1681 return i;
1682}
1683
1684/* console_lock is held */
1685static void csi_m(struct vc_data *vc)
1686{
1687 int i;
1688
1689 for (i = 0; i <= vc->vc_npar; i++)
1690 switch (vc->vc_par[i]) {
1691 case 0: /* all attributes off */
1692 default_attr(vc);
1693 break;
1694 case 1:
1695 vc->state.intensity = VCI_BOLD;
1696 break;
1697 case 2:
1698 vc->state.intensity = VCI_HALF_BRIGHT;
1699 break;
1700 case 3:
1701 vc->state.italic = true;
1702 break;
1703 case 21:
1704 /*
1705 * No console drivers support double underline, so
1706 * convert it to a single underline.
1707 */
1708 case 4:
1709 vc->state.underline = true;
1710 break;
1711 case 5:
1712 vc->state.blink = true;
1713 break;
1714 case 7:
1715 vc->state.reverse = true;
1716 break;
1717 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1718 * Select primary font, don't display control chars if
1719 * defined, don't set bit 8 on output.
1720 */
1721 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1722 vc->vc_disp_ctrl = 0;
1723 vc->vc_toggle_meta = 0;
1724 break;
1725 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1726 * Select first alternate font, lets chars < 32 be
1727 * displayed as ROM chars.
1728 */
1729 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1730 vc->vc_disp_ctrl = 1;
1731 vc->vc_toggle_meta = 0;
1732 break;
1733 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1734 * Select second alternate font, toggle high bit
1735 * before displaying as ROM char.
1736 */
1737 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1738 vc->vc_disp_ctrl = 1;
1739 vc->vc_toggle_meta = 1;
1740 break;
1741 case 22:
1742 vc->state.intensity = VCI_NORMAL;
1743 break;
1744 case 23:
1745 vc->state.italic = false;
1746 break;
1747 case 24:
1748 vc->state.underline = false;
1749 break;
1750 case 25:
1751 vc->state.blink = false;
1752 break;
1753 case 27:
1754 vc->state.reverse = false;
1755 break;
1756 case 38:
1757 i = vc_t416_color(vc, i, rgb_foreground);
1758 break;
1759 case 48:
1760 i = vc_t416_color(vc, i, rgb_background);
1761 break;
1762 case 39:
1763 vc->state.color = (vc->vc_def_color & 0x0f) |
1764 (vc->state.color & 0xf0);
1765 break;
1766 case 49:
1767 vc->state.color = (vc->vc_def_color & 0xf0) |
1768 (vc->state.color & 0x0f);
1769 break;
1770 default:
1771 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1772 if (vc->vc_par[i] < 100)
1773 vc->state.intensity = VCI_BOLD;
1774 vc->vc_par[i] -= 60;
1775 }
1776 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1777 vc->state.color = color_table[vc->vc_par[i] - 30]
1778 | (vc->state.color & 0xf0);
1779 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1780 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1781 | (vc->state.color & 0x0f);
1782 break;
1783 }
1784 update_attr(vc);
1785}
1786
1787static void respond_string(const char *p, size_t len, struct tty_port *port)
1788{
1789 tty_insert_flip_string(port, p, len);
1790 tty_flip_buffer_push(port);
1791}
1792
1793static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1794{
1795 char buf[40];
1796 int len;
1797
1798 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1799 (vc->vc_decom ? vc->vc_top + 1 : 1),
1800 vc->state.x + 1);
1801 respond_string(buf, len, tty->port);
1802}
1803
1804static inline void status_report(struct tty_struct *tty)
1805{
1806 static const char teminal_ok[] = "\033[0n";
1807
1808 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1809}
1810
1811static inline void respond_ID(struct tty_struct *tty)
1812{
1813 /* terminal answer to an ESC-Z or csi0c query. */
1814 static const char vt102_id[] = "\033[?6c";
1815
1816 respond_string(vt102_id, strlen(vt102_id), tty->port);
1817}
1818
1819void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1820{
1821 char buf[8];
1822 int len;
1823
1824 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1825 (char)('!' + mrx), (char)('!' + mry));
1826 respond_string(buf, len, tty->port);
1827}
1828
1829/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1830int mouse_reporting(void)
1831{
1832 return vc_cons[fg_console].d->vc_report_mouse;
1833}
1834
1835/* console_lock is held */
1836static void set_mode(struct vc_data *vc, int on_off)
1837{
1838 int i;
1839
1840 for (i = 0; i <= vc->vc_npar; i++)
1841 if (vc->vc_priv == EPdec) {
1842 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1843 case 1: /* Cursor keys send ^[Ox/^[[x */
1844 if (on_off)
1845 set_kbd(vc, decckm);
1846 else
1847 clr_kbd(vc, decckm);
1848 break;
1849 case 3: /* 80/132 mode switch unimplemented */
1850#if 0
1851 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1852 /* this alone does not suffice; some user mode
1853 utility has to change the hardware regs */
1854#endif
1855 break;
1856 case 5: /* Inverted screen on/off */
1857 if (vc->vc_decscnm != on_off) {
1858 vc->vc_decscnm = on_off;
1859 invert_screen(vc, 0,
1860 vc->vc_screenbuf_size,
1861 false);
1862 update_attr(vc);
1863 }
1864 break;
1865 case 6: /* Origin relative/absolute */
1866 vc->vc_decom = on_off;
1867 gotoxay(vc, 0, 0);
1868 break;
1869 case 7: /* Autowrap on/off */
1870 vc->vc_decawm = on_off;
1871 break;
1872 case 8: /* Autorepeat on/off */
1873 if (on_off)
1874 set_kbd(vc, decarm);
1875 else
1876 clr_kbd(vc, decarm);
1877 break;
1878 case 9:
1879 vc->vc_report_mouse = on_off ? 1 : 0;
1880 break;
1881 case 25: /* Cursor on/off */
1882 vc->vc_deccm = on_off;
1883 break;
1884 case 1000:
1885 vc->vc_report_mouse = on_off ? 2 : 0;
1886 break;
1887 }
1888 } else {
1889 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1890 case 3: /* Monitor (display ctrls) */
1891 vc->vc_disp_ctrl = on_off;
1892 break;
1893 case 4: /* Insert Mode on/off */
1894 vc->vc_decim = on_off;
1895 break;
1896 case 20: /* Lf, Enter == CrLf/Lf */
1897 if (on_off)
1898 set_kbd(vc, lnm);
1899 else
1900 clr_kbd(vc, lnm);
1901 break;
1902 }
1903 }
1904}
1905
1906/* console_lock is held */
1907static void setterm_command(struct vc_data *vc)
1908{
1909 switch (vc->vc_par[0]) {
1910 case 1: /* set color for underline mode */
1911 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1912 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1913 if (vc->state.underline)
1914 update_attr(vc);
1915 }
1916 break;
1917 case 2: /* set color for half intensity mode */
1918 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1919 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1920 if (vc->state.intensity == VCI_HALF_BRIGHT)
1921 update_attr(vc);
1922 }
1923 break;
1924 case 8: /* store colors as defaults */
1925 vc->vc_def_color = vc->vc_attr;
1926 if (vc->vc_hi_font_mask == 0x100)
1927 vc->vc_def_color >>= 1;
1928 default_attr(vc);
1929 update_attr(vc);
1930 break;
1931 case 9: /* set blanking interval */
1932 blankinterval = min(vc->vc_par[1], 60U) * 60;
1933 poke_blanked_console();
1934 break;
1935 case 10: /* set bell frequency in Hz */
1936 if (vc->vc_npar >= 1)
1937 vc->vc_bell_pitch = vc->vc_par[1];
1938 else
1939 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1940 break;
1941 case 11: /* set bell duration in msec */
1942 if (vc->vc_npar >= 1)
1943 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1944 msecs_to_jiffies(vc->vc_par[1]) : 0;
1945 else
1946 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1947 break;
1948 case 12: /* bring specified console to the front */
1949 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1950 set_console(vc->vc_par[1] - 1);
1951 break;
1952 case 13: /* unblank the screen */
1953 poke_blanked_console();
1954 break;
1955 case 14: /* set vesa powerdown interval */
1956 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1957 break;
1958 case 15: /* activate the previous console */
1959 set_console(last_console);
1960 break;
1961 case 16: /* set cursor blink duration in msec */
1962 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1963 vc->vc_par[1] <= USHRT_MAX)
1964 vc->vc_cur_blink_ms = vc->vc_par[1];
1965 else
1966 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1967 break;
1968 }
1969}
1970
1971/* console_lock is held */
1972static void csi_at(struct vc_data *vc, unsigned int nr)
1973{
1974 if (nr > vc->vc_cols - vc->state.x)
1975 nr = vc->vc_cols - vc->state.x;
1976 else if (!nr)
1977 nr = 1;
1978 insert_char(vc, nr);
1979}
1980
1981/* console_lock is held */
1982static void csi_L(struct vc_data *vc, unsigned int nr)
1983{
1984 if (nr > vc->vc_rows - vc->state.y)
1985 nr = vc->vc_rows - vc->state.y;
1986 else if (!nr)
1987 nr = 1;
1988 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1989 vc->vc_need_wrap = 0;
1990}
1991
1992/* console_lock is held */
1993static void csi_P(struct vc_data *vc, unsigned int nr)
1994{
1995 if (nr > vc->vc_cols - vc->state.x)
1996 nr = vc->vc_cols - vc->state.x;
1997 else if (!nr)
1998 nr = 1;
1999 delete_char(vc, nr);
2000}
2001
2002/* console_lock is held */
2003static void csi_M(struct vc_data *vc, unsigned int nr)
2004{
2005 if (nr > vc->vc_rows - vc->state.y)
2006 nr = vc->vc_rows - vc->state.y;
2007 else if (!nr)
2008 nr=1;
2009 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2010 vc->vc_need_wrap = 0;
2011}
2012
2013/* console_lock is held (except via vc_init->reset_terminal */
2014static void save_cur(struct vc_data *vc)
2015{
2016 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2017}
2018
2019/* console_lock is held */
2020static void restore_cur(struct vc_data *vc)
2021{
2022 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2023
2024 gotoxy(vc, vc->state.x, vc->state.y);
2025 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2026 vc);
2027 update_attr(vc);
2028 vc->vc_need_wrap = 0;
2029}
2030
2031enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2032 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2033 ESpalette, ESosc, ESapc, ESpm, ESdcs };
2034
2035/* console_lock is held (except via vc_init()) */
2036static void reset_terminal(struct vc_data *vc, int do_clear)
2037{
2038 unsigned int i;
2039
2040 vc->vc_top = 0;
2041 vc->vc_bottom = vc->vc_rows;
2042 vc->vc_state = ESnormal;
2043 vc->vc_priv = EPecma;
2044 vc->vc_translate = set_translate(LAT1_MAP, vc);
2045 vc->state.Gx_charset[0] = LAT1_MAP;
2046 vc->state.Gx_charset[1] = GRAF_MAP;
2047 vc->state.charset = 0;
2048 vc->vc_need_wrap = 0;
2049 vc->vc_report_mouse = 0;
2050 vc->vc_utf = default_utf8;
2051 vc->vc_utf_count = 0;
2052
2053 vc->vc_disp_ctrl = 0;
2054 vc->vc_toggle_meta = 0;
2055
2056 vc->vc_decscnm = 0;
2057 vc->vc_decom = 0;
2058 vc->vc_decawm = 1;
2059 vc->vc_deccm = global_cursor_default;
2060 vc->vc_decim = 0;
2061
2062 vt_reset_keyboard(vc->vc_num);
2063
2064 vc->vc_cursor_type = cur_default;
2065 vc->vc_complement_mask = vc->vc_s_complement_mask;
2066
2067 default_attr(vc);
2068 update_attr(vc);
2069
2070 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2071 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2072 set_bit(i, vc->vc_tab_stop);
2073
2074 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2075 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2076 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2077
2078 gotoxy(vc, 0, 0);
2079 save_cur(vc);
2080 if (do_clear)
2081 csi_J(vc, 2);
2082}
2083
2084static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2085{
2086 unsigned char *charset = &vc->state.Gx_charset[which];
2087
2088 switch (c) {
2089 case '0':
2090 *charset = GRAF_MAP;
2091 break;
2092 case 'B':
2093 *charset = LAT1_MAP;
2094 break;
2095 case 'U':
2096 *charset = IBMPC_MAP;
2097 break;
2098 case 'K':
2099 *charset = USER_MAP;
2100 break;
2101 }
2102
2103 if (vc->state.charset == which)
2104 vc->vc_translate = set_translate(*charset, vc);
2105}
2106
2107/* is this state an ANSI control string? */
2108static bool ansi_control_string(unsigned int state)
2109{
2110 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2111 return true;
2112 return false;
2113}
2114
2115/* console_lock is held */
2116static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2117{
2118 /*
2119 * Control characters can be used in the _middle_
2120 * of an escape sequence, aside from ANSI control strings.
2121 */
2122 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
2123 return;
2124 switch (c) {
2125 case 0:
2126 return;
2127 case 7:
2128 if (ansi_control_string(vc->vc_state))
2129 vc->vc_state = ESnormal;
2130 else if (vc->vc_bell_duration)
2131 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2132 return;
2133 case 8:
2134 bs(vc);
2135 return;
2136 case 9:
2137 vc->vc_pos -= (vc->state.x << 1);
2138
2139 vc->state.x = find_next_bit(vc->vc_tab_stop,
2140 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2141 vc->state.x + 1);
2142 if (vc->state.x >= VC_TABSTOPS_COUNT)
2143 vc->state.x = vc->vc_cols - 1;
2144
2145 vc->vc_pos += (vc->state.x << 1);
2146 notify_write(vc, '\t');
2147 return;
2148 case 10: case 11: case 12:
2149 lf(vc);
2150 if (!is_kbd(vc, lnm))
2151 return;
2152 fallthrough;
2153 case 13:
2154 cr(vc);
2155 return;
2156 case 14:
2157 vc->state.charset = 1;
2158 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2159 vc->vc_disp_ctrl = 1;
2160 return;
2161 case 15:
2162 vc->state.charset = 0;
2163 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2164 vc->vc_disp_ctrl = 0;
2165 return;
2166 case 24: case 26:
2167 vc->vc_state = ESnormal;
2168 return;
2169 case 27:
2170 vc->vc_state = ESesc;
2171 return;
2172 case 127:
2173 del(vc);
2174 return;
2175 case 128+27:
2176 vc->vc_state = ESsquare;
2177 return;
2178 }
2179 switch(vc->vc_state) {
2180 case ESesc:
2181 vc->vc_state = ESnormal;
2182 switch (c) {
2183 case '[':
2184 vc->vc_state = ESsquare;
2185 return;
2186 case ']':
2187 vc->vc_state = ESnonstd;
2188 return;
2189 case '_':
2190 vc->vc_state = ESapc;
2191 return;
2192 case '^':
2193 vc->vc_state = ESpm;
2194 return;
2195 case '%':
2196 vc->vc_state = ESpercent;
2197 return;
2198 case 'E':
2199 cr(vc);
2200 lf(vc);
2201 return;
2202 case 'M':
2203 ri(vc);
2204 return;
2205 case 'D':
2206 lf(vc);
2207 return;
2208 case 'H':
2209 if (vc->state.x < VC_TABSTOPS_COUNT)
2210 set_bit(vc->state.x, vc->vc_tab_stop);
2211 return;
2212 case 'P':
2213 vc->vc_state = ESdcs;
2214 return;
2215 case 'Z':
2216 respond_ID(tty);
2217 return;
2218 case '7':
2219 save_cur(vc);
2220 return;
2221 case '8':
2222 restore_cur(vc);
2223 return;
2224 case '(':
2225 vc->vc_state = ESsetG0;
2226 return;
2227 case ')':
2228 vc->vc_state = ESsetG1;
2229 return;
2230 case '#':
2231 vc->vc_state = EShash;
2232 return;
2233 case 'c':
2234 reset_terminal(vc, 1);
2235 return;
2236 case '>': /* Numeric keypad */
2237 clr_kbd(vc, kbdapplic);
2238 return;
2239 case '=': /* Appl. keypad */
2240 set_kbd(vc, kbdapplic);
2241 return;
2242 }
2243 return;
2244 case ESnonstd:
2245 if (c=='P') { /* palette escape sequence */
2246 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2247 vc->vc_par[vc->vc_npar] = 0;
2248 vc->vc_npar = 0;
2249 vc->vc_state = ESpalette;
2250 return;
2251 } else if (c=='R') { /* reset palette */
2252 reset_palette(vc);
2253 vc->vc_state = ESnormal;
2254 } else if (c>='0' && c<='9')
2255 vc->vc_state = ESosc;
2256 else
2257 vc->vc_state = ESnormal;
2258 return;
2259 case ESpalette:
2260 if (isxdigit(c)) {
2261 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2262 if (vc->vc_npar == 7) {
2263 int i = vc->vc_par[0] * 3, j = 1;
2264 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2265 vc->vc_palette[i++] += vc->vc_par[j++];
2266 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2267 vc->vc_palette[i++] += vc->vc_par[j++];
2268 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2269 vc->vc_palette[i] += vc->vc_par[j];
2270 set_palette(vc);
2271 vc->vc_state = ESnormal;
2272 }
2273 } else
2274 vc->vc_state = ESnormal;
2275 return;
2276 case ESsquare:
2277 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2278 vc->vc_par[vc->vc_npar] = 0;
2279 vc->vc_npar = 0;
2280 vc->vc_state = ESgetpars;
2281 if (c == '[') { /* Function key */
2282 vc->vc_state=ESfunckey;
2283 return;
2284 }
2285 switch (c) {
2286 case '?':
2287 vc->vc_priv = EPdec;
2288 return;
2289 case '>':
2290 vc->vc_priv = EPgt;
2291 return;
2292 case '=':
2293 vc->vc_priv = EPeq;
2294 return;
2295 case '<':
2296 vc->vc_priv = EPlt;
2297 return;
2298 }
2299 vc->vc_priv = EPecma;
2300 fallthrough;
2301 case ESgetpars:
2302 if (c == ';' && vc->vc_npar < NPAR - 1) {
2303 vc->vc_npar++;
2304 return;
2305 } else if (c>='0' && c<='9') {
2306 vc->vc_par[vc->vc_npar] *= 10;
2307 vc->vc_par[vc->vc_npar] += c - '0';
2308 return;
2309 }
2310 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2311 vc->vc_state = EScsiignore;
2312 return;
2313 }
2314 vc->vc_state = ESnormal;
2315 switch(c) {
2316 case 'h':
2317 if (vc->vc_priv <= EPdec)
2318 set_mode(vc, 1);
2319 return;
2320 case 'l':
2321 if (vc->vc_priv <= EPdec)
2322 set_mode(vc, 0);
2323 return;
2324 case 'c':
2325 if (vc->vc_priv == EPdec) {
2326 if (vc->vc_par[0])
2327 vc->vc_cursor_type =
2328 CUR_MAKE(vc->vc_par[0],
2329 vc->vc_par[1],
2330 vc->vc_par[2]);
2331 else
2332 vc->vc_cursor_type = cur_default;
2333 return;
2334 }
2335 break;
2336 case 'm':
2337 if (vc->vc_priv == EPdec) {
2338 clear_selection();
2339 if (vc->vc_par[0])
2340 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2341 else
2342 vc->vc_complement_mask = vc->vc_s_complement_mask;
2343 return;
2344 }
2345 break;
2346 case 'n':
2347 if (vc->vc_priv == EPecma) {
2348 if (vc->vc_par[0] == 5)
2349 status_report(tty);
2350 else if (vc->vc_par[0] == 6)
2351 cursor_report(vc, tty);
2352 }
2353 return;
2354 }
2355 if (vc->vc_priv != EPecma) {
2356 vc->vc_priv = EPecma;
2357 return;
2358 }
2359 switch(c) {
2360 case 'G': case '`':
2361 if (vc->vc_par[0])
2362 vc->vc_par[0]--;
2363 gotoxy(vc, vc->vc_par[0], vc->state.y);
2364 return;
2365 case 'A':
2366 if (!vc->vc_par[0])
2367 vc->vc_par[0]++;
2368 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2369 return;
2370 case 'B': case 'e':
2371 if (!vc->vc_par[0])
2372 vc->vc_par[0]++;
2373 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2374 return;
2375 case 'C': case 'a':
2376 if (!vc->vc_par[0])
2377 vc->vc_par[0]++;
2378 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2379 return;
2380 case 'D':
2381 if (!vc->vc_par[0])
2382 vc->vc_par[0]++;
2383 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2384 return;
2385 case 'E':
2386 if (!vc->vc_par[0])
2387 vc->vc_par[0]++;
2388 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2389 return;
2390 case 'F':
2391 if (!vc->vc_par[0])
2392 vc->vc_par[0]++;
2393 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2394 return;
2395 case 'd':
2396 if (vc->vc_par[0])
2397 vc->vc_par[0]--;
2398 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2399 return;
2400 case 'H': case 'f':
2401 if (vc->vc_par[0])
2402 vc->vc_par[0]--;
2403 if (vc->vc_par[1])
2404 vc->vc_par[1]--;
2405 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2406 return;
2407 case 'J':
2408 csi_J(vc, vc->vc_par[0]);
2409 return;
2410 case 'K':
2411 csi_K(vc, vc->vc_par[0]);
2412 return;
2413 case 'L':
2414 csi_L(vc, vc->vc_par[0]);
2415 return;
2416 case 'M':
2417 csi_M(vc, vc->vc_par[0]);
2418 return;
2419 case 'P':
2420 csi_P(vc, vc->vc_par[0]);
2421 return;
2422 case 'c':
2423 if (!vc->vc_par[0])
2424 respond_ID(tty);
2425 return;
2426 case 'g':
2427 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2428 set_bit(vc->state.x, vc->vc_tab_stop);
2429 else if (vc->vc_par[0] == 3)
2430 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2431 return;
2432 case 'm':
2433 csi_m(vc);
2434 return;
2435 case 'q': /* DECLL - but only 3 leds */
2436 /* map 0,1,2,3 to 0,1,2,4 */
2437 if (vc->vc_par[0] < 4)
2438 vt_set_led_state(vc->vc_num,
2439 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2440 return;
2441 case 'r':
2442 if (!vc->vc_par[0])
2443 vc->vc_par[0]++;
2444 if (!vc->vc_par[1])
2445 vc->vc_par[1] = vc->vc_rows;
2446 /* Minimum allowed region is 2 lines */
2447 if (vc->vc_par[0] < vc->vc_par[1] &&
2448 vc->vc_par[1] <= vc->vc_rows) {
2449 vc->vc_top = vc->vc_par[0] - 1;
2450 vc->vc_bottom = vc->vc_par[1];
2451 gotoxay(vc, 0, 0);
2452 }
2453 return;
2454 case 's':
2455 save_cur(vc);
2456 return;
2457 case 'u':
2458 restore_cur(vc);
2459 return;
2460 case 'X':
2461 csi_X(vc, vc->vc_par[0]);
2462 return;
2463 case '@':
2464 csi_at(vc, vc->vc_par[0]);
2465 return;
2466 case ']': /* setterm functions */
2467 setterm_command(vc);
2468 return;
2469 }
2470 return;
2471 case EScsiignore:
2472 if (c >= 20 && c <= 0x3f)
2473 return;
2474 vc->vc_state = ESnormal;
2475 return;
2476 case ESpercent:
2477 vc->vc_state = ESnormal;
2478 switch (c) {
2479 case '@': /* defined in ISO 2022 */
2480 vc->vc_utf = 0;
2481 return;
2482 case 'G': /* prelim official escape code */
2483 case '8': /* retained for compatibility */
2484 vc->vc_utf = 1;
2485 return;
2486 }
2487 return;
2488 case ESfunckey:
2489 vc->vc_state = ESnormal;
2490 return;
2491 case EShash:
2492 vc->vc_state = ESnormal;
2493 if (c == '8') {
2494 /* DEC screen alignment test. kludge :-) */
2495 vc->vc_video_erase_char =
2496 (vc->vc_video_erase_char & 0xff00) | 'E';
2497 csi_J(vc, 2);
2498 vc->vc_video_erase_char =
2499 (vc->vc_video_erase_char & 0xff00) | ' ';
2500 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2501 }
2502 return;
2503 case ESsetG0:
2504 vc_setGx(vc, 0, c);
2505 vc->vc_state = ESnormal;
2506 return;
2507 case ESsetG1:
2508 vc_setGx(vc, 1, c);
2509 vc->vc_state = ESnormal;
2510 return;
2511 case ESapc:
2512 return;
2513 case ESosc:
2514 return;
2515 case ESpm:
2516 return;
2517 case ESdcs:
2518 return;
2519 default:
2520 vc->vc_state = ESnormal;
2521 }
2522}
2523
2524/* is_double_width() is based on the wcwidth() implementation by
2525 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2526 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2527 */
2528struct interval {
2529 uint32_t first;
2530 uint32_t last;
2531};
2532
2533static int ucs_cmp(const void *key, const void *elt)
2534{
2535 uint32_t ucs = *(uint32_t *)key;
2536 struct interval e = *(struct interval *) elt;
2537
2538 if (ucs > e.last)
2539 return 1;
2540 else if (ucs < e.first)
2541 return -1;
2542 return 0;
2543}
2544
2545static int is_double_width(uint32_t ucs)
2546{
2547 static const struct interval double_width[] = {
2548 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2549 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2550 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2551 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2552 };
2553 if (ucs < double_width[0].first ||
2554 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2555 return 0;
2556
2557 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2558 sizeof(struct interval), ucs_cmp) != NULL;
2559}
2560
2561struct vc_draw_region {
2562 unsigned long from, to;
2563 int x;
2564};
2565
2566static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2567{
2568 if (draw->x < 0)
2569 return;
2570
2571 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2572 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2573 draw->x);
2574 draw->x = -1;
2575}
2576
2577static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2578{
2579 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2580 if (vc->vc_toggle_meta)
2581 c |= 0x80;
2582
2583 return vc->vc_translate[c];
2584 }
2585
2586 return c;
2587}
2588
2589
2590/**
2591 * vc_sanitize_unicode - Replace invalid Unicode code points with U+FFFD
2592 * @c: the received character, or U+FFFD for invalid sequences.
2593 */
2594static inline int vc_sanitize_unicode(const int c)
2595{
2596 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2597 return 0xfffd;
2598
2599 return c;
2600}
2601
2602/**
2603 * vc_translate_unicode - Combine UTF-8 into Unicode in @vc_utf_char
2604 * @vc: virtual console
2605 * @c: character to translate
2606 * @rescan: we return true if we need more (continuation) data
2607 *
2608 * @vc_utf_char is the being-constructed unicode character.
2609 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2610 * @vc_npar is the number of continuation bytes arrived so far.
2611 */
2612static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2613{
2614 static const u32 utf8_length_changes[] = {
2615 0x0000007f, 0x000007ff, 0x0000ffff,
2616 0x001fffff, 0x03ffffff, 0x7fffffff
2617 };
2618
2619 /* Continuation byte received */
2620 if ((c & 0xc0) == 0x80) {
2621 /* Unexpected continuation byte? */
2622 if (!vc->vc_utf_count)
2623 return 0xfffd;
2624
2625 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2626 vc->vc_npar++;
2627 if (--vc->vc_utf_count)
2628 goto need_more_bytes;
2629
2630 /* Got a whole character */
2631 c = vc->vc_utf_char;
2632 /* Reject overlong sequences */
2633 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2634 c > utf8_length_changes[vc->vc_npar])
2635 return 0xfffd;
2636
2637 return vc_sanitize_unicode(c);
2638 }
2639
2640 /* Single ASCII byte or first byte of a sequence received */
2641 if (vc->vc_utf_count) {
2642 /* Continuation byte expected */
2643 *rescan = true;
2644 vc->vc_utf_count = 0;
2645 return 0xfffd;
2646 }
2647
2648 /* Nothing to do if an ASCII byte was received */
2649 if (c <= 0x7f)
2650 return c;
2651
2652 /* First byte of a multibyte sequence received */
2653 vc->vc_npar = 0;
2654 if ((c & 0xe0) == 0xc0) {
2655 vc->vc_utf_count = 1;
2656 vc->vc_utf_char = (c & 0x1f);
2657 } else if ((c & 0xf0) == 0xe0) {
2658 vc->vc_utf_count = 2;
2659 vc->vc_utf_char = (c & 0x0f);
2660 } else if ((c & 0xf8) == 0xf0) {
2661 vc->vc_utf_count = 3;
2662 vc->vc_utf_char = (c & 0x07);
2663 } else if ((c & 0xfc) == 0xf8) {
2664 vc->vc_utf_count = 4;
2665 vc->vc_utf_char = (c & 0x03);
2666 } else if ((c & 0xfe) == 0xfc) {
2667 vc->vc_utf_count = 5;
2668 vc->vc_utf_char = (c & 0x01);
2669 } else {
2670 /* 254 and 255 are invalid */
2671 return 0xfffd;
2672 }
2673
2674need_more_bytes:
2675 return -1;
2676}
2677
2678static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2679{
2680 /* Do no translation at all in control states */
2681 if (vc->vc_state != ESnormal)
2682 return *c;
2683
2684 if (vc->vc_utf && !vc->vc_disp_ctrl)
2685 return *c = vc_translate_unicode(vc, *c, rescan);
2686
2687 /* no utf or alternate charset mode */
2688 return vc_translate_ascii(vc, *c);
2689}
2690
2691static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2692{
2693 if (!vc->vc_can_do_color)
2694 return vc->vc_attr ^ 0x08;
2695
2696 if (vc->vc_hi_font_mask == 0x100)
2697 return (vc->vc_attr & 0x11) |
2698 ((vc->vc_attr & 0xe0) >> 4) |
2699 ((vc->vc_attr & 0x0e) << 4);
2700
2701 return (vc->vc_attr & 0x88) |
2702 ((vc->vc_attr & 0x70) >> 4) |
2703 ((vc->vc_attr & 0x07) << 4);
2704}
2705
2706static bool vc_is_control(struct vc_data *vc, int tc, int c)
2707{
2708 /*
2709 * A bitmap for codes <32. A bit of 1 indicates that the code
2710 * corresponding to that bit number invokes some special action (such
2711 * as cursor movement) and should not be displayed as a glyph unless
2712 * the disp_ctrl mode is explicitly enabled.
2713 */
2714 static const u32 CTRL_ACTION = 0x0d00ff81;
2715 /* Cannot be overridden by disp_ctrl */
2716 static const u32 CTRL_ALWAYS = 0x0800f501;
2717
2718 if (vc->vc_state != ESnormal)
2719 return true;
2720
2721 if (!tc)
2722 return true;
2723
2724 /*
2725 * If the original code was a control character we only allow a glyph
2726 * to be displayed if the code is not normally used (such as for cursor
2727 * movement) or if the disp_ctrl mode has been explicitly enabled.
2728 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2729 * displayed as control characters, as the console would be pretty
2730 * useless without them; to display an arbitrary font position use the
2731 * direct-to-font zone in UTF-8 mode.
2732 */
2733 if (c < 32) {
2734 if (vc->vc_disp_ctrl)
2735 return CTRL_ALWAYS & BIT(c);
2736 else
2737 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2738 }
2739
2740 if (c == 127 && !vc->vc_disp_ctrl)
2741 return true;
2742
2743 if (c == 128 + 27)
2744 return true;
2745
2746 return false;
2747}
2748
2749static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2750 struct vc_draw_region *draw)
2751{
2752 int next_c;
2753 unsigned char vc_attr = vc->vc_attr;
2754 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2755 u8 width = 1;
2756 bool inverse = false;
2757
2758 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2759 if (is_double_width(c))
2760 width = 2;
2761 }
2762
2763 /* Now try to find out how to display it */
2764 tc = conv_uni_to_pc(vc, tc);
2765 if (tc & ~charmask) {
2766 if (tc == -1 || tc == -2)
2767 return -1; /* nothing to display */
2768
2769 /* Glyph not found */
2770 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2771 !(c & ~charmask)) {
2772 /*
2773 * In legacy mode use the glyph we get by a 1:1
2774 * mapping.
2775 * This would make absolutely no sense with Unicode in
2776 * mind, but do this for ASCII characters since a font
2777 * may lack Unicode mapping info and we don't want to
2778 * end up with having question marks only.
2779 */
2780 tc = c;
2781 } else {
2782 /*
2783 * Display U+FFFD. If it's not found, display an inverse
2784 * question mark.
2785 */
2786 tc = conv_uni_to_pc(vc, 0xfffd);
2787 if (tc < 0) {
2788 inverse = true;
2789 tc = conv_uni_to_pc(vc, '?');
2790 if (tc < 0)
2791 tc = '?';
2792
2793 vc_attr = vc_invert_attr(vc);
2794 con_flush(vc, draw);
2795 }
2796 }
2797 }
2798
2799 next_c = c;
2800 while (1) {
2801 if (vc->vc_need_wrap || vc->vc_decim)
2802 con_flush(vc, draw);
2803 if (vc->vc_need_wrap) {
2804 cr(vc);
2805 lf(vc);
2806 }
2807 if (vc->vc_decim)
2808 insert_char(vc, 1);
2809 vc_uniscr_putc(vc, next_c);
2810
2811 if (himask)
2812 tc = ((tc & 0x100) ? himask : 0) |
2813 (tc & 0xff);
2814 tc |= (vc_attr << 8) & ~himask;
2815
2816 scr_writew(tc, (u16 *)vc->vc_pos);
2817
2818 if (con_should_update(vc) && draw->x < 0) {
2819 draw->x = vc->state.x;
2820 draw->from = vc->vc_pos;
2821 }
2822 if (vc->state.x == vc->vc_cols - 1) {
2823 vc->vc_need_wrap = vc->vc_decawm;
2824 draw->to = vc->vc_pos + 2;
2825 } else {
2826 vc->state.x++;
2827 draw->to = (vc->vc_pos += 2);
2828 }
2829
2830 if (!--width)
2831 break;
2832
2833 /* A space is printed in the second column */
2834 tc = conv_uni_to_pc(vc, ' ');
2835 if (tc < 0)
2836 tc = ' ';
2837 next_c = ' ';
2838 }
2839 notify_write(vc, c);
2840
2841 if (inverse)
2842 con_flush(vc, draw);
2843
2844 return 0;
2845}
2846
2847/* acquires console_lock */
2848static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
2849{
2850 struct vc_draw_region draw = {
2851 .x = -1,
2852 };
2853 int c, tc, n = 0;
2854 unsigned int currcons;
2855 struct vc_data *vc;
2856 struct vt_notifier_param param;
2857 bool rescan;
2858
2859 if (in_interrupt())
2860 return count;
2861
2862 console_lock();
2863 vc = tty->driver_data;
2864 if (vc == NULL) {
2865 pr_err("vt: argh, driver_data is NULL !\n");
2866 console_unlock();
2867 return 0;
2868 }
2869
2870 currcons = vc->vc_num;
2871 if (!vc_cons_allocated(currcons)) {
2872 /* could this happen? */
2873 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2874 console_unlock();
2875 return 0;
2876 }
2877
2878
2879 /* undraw cursor first */
2880 if (con_is_fg(vc))
2881 hide_cursor(vc);
2882
2883 param.vc = vc;
2884
2885 while (!tty->flow.stopped && count) {
2886 int orig = *buf;
2887 buf++;
2888 n++;
2889 count--;
2890rescan_last_byte:
2891 c = orig;
2892 rescan = false;
2893
2894 tc = vc_translate(vc, &c, &rescan);
2895 if (tc == -1)
2896 continue;
2897
2898 param.c = tc;
2899 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2900 ¶m) == NOTIFY_STOP)
2901 continue;
2902
2903 if (vc_is_control(vc, tc, c)) {
2904 con_flush(vc, &draw);
2905 do_con_trol(tty, vc, orig);
2906 continue;
2907 }
2908
2909 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2910 continue;
2911
2912 if (rescan)
2913 goto rescan_last_byte;
2914 }
2915 con_flush(vc, &draw);
2916 console_conditional_schedule();
2917 notify_update(vc);
2918 console_unlock();
2919 return n;
2920}
2921
2922/*
2923 * This is the console switching callback.
2924 *
2925 * Doing console switching in a process context allows
2926 * us to do the switches asynchronously (needed when we want
2927 * to switch due to a keyboard interrupt). Synchronization
2928 * with other console code and prevention of re-entrancy is
2929 * ensured with console_lock.
2930 */
2931static void console_callback(struct work_struct *ignored)
2932{
2933 console_lock();
2934
2935 if (want_console >= 0) {
2936 if (want_console != fg_console &&
2937 vc_cons_allocated(want_console)) {
2938 hide_cursor(vc_cons[fg_console].d);
2939 change_console(vc_cons[want_console].d);
2940 /* we only changed when the console had already
2941 been allocated - a new console is not created
2942 in an interrupt routine */
2943 }
2944 want_console = -1;
2945 }
2946 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2947 do_poke_blanked_console = 0;
2948 poke_blanked_console();
2949 }
2950 if (scrollback_delta) {
2951 struct vc_data *vc = vc_cons[fg_console].d;
2952 clear_selection();
2953 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2954 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2955 scrollback_delta = 0;
2956 }
2957 if (blank_timer_expired) {
2958 do_blank_screen(0);
2959 blank_timer_expired = 0;
2960 }
2961 notify_update(vc_cons[fg_console].d);
2962
2963 console_unlock();
2964}
2965
2966int set_console(int nr)
2967{
2968 struct vc_data *vc = vc_cons[fg_console].d;
2969
2970 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2971 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2972
2973 /*
2974 * Console switch will fail in console_callback() or
2975 * change_console() so there is no point scheduling
2976 * the callback
2977 *
2978 * Existing set_console() users don't check the return
2979 * value so this shouldn't break anything
2980 */
2981 return -EINVAL;
2982 }
2983
2984 want_console = nr;
2985 schedule_console_callback();
2986
2987 return 0;
2988}
2989
2990struct tty_driver *console_driver;
2991
2992#ifdef CONFIG_VT_CONSOLE
2993
2994/**
2995 * vt_kmsg_redirect() - Sets/gets the kernel message console
2996 * @new: The new virtual terminal number or -1 if the console should stay
2997 * unchanged
2998 *
2999 * By default, the kernel messages are always printed on the current virtual
3000 * console. However, the user may modify that default with the
3001 * TIOCL_SETKMSGREDIRECT ioctl call.
3002 *
3003 * This function sets the kernel message console to be @new. It returns the old
3004 * virtual console number. The virtual terminal number 0 (both as parameter and
3005 * return value) means no redirection (i.e. always printed on the currently
3006 * active console).
3007 *
3008 * The parameter -1 means that only the current console is returned, but the
3009 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3010 * case to make the code more understandable.
3011 *
3012 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3013 * the parameter and always returns 0.
3014 */
3015int vt_kmsg_redirect(int new)
3016{
3017 static int kmsg_con;
3018
3019 if (new != -1)
3020 return xchg(&kmsg_con, new);
3021 else
3022 return kmsg_con;
3023}
3024
3025/*
3026 * Console on virtual terminal
3027 *
3028 * The console must be locked when we get here.
3029 */
3030
3031static void vt_console_print(struct console *co, const char *b, unsigned count)
3032{
3033 struct vc_data *vc = vc_cons[fg_console].d;
3034 unsigned char c;
3035 static DEFINE_SPINLOCK(printing_lock);
3036 const ushort *start;
3037 ushort start_x, cnt;
3038 int kmsg_console;
3039
3040 WARN_CONSOLE_UNLOCKED();
3041
3042 /* this protects against concurrent oops only */
3043 if (!spin_trylock(&printing_lock))
3044 return;
3045
3046 kmsg_console = vt_get_kmsg_redirect();
3047 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3048 vc = vc_cons[kmsg_console - 1].d;
3049
3050 if (!vc_cons_allocated(fg_console)) {
3051 /* impossible */
3052 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3053 goto quit;
3054 }
3055
3056 if (vc->vc_mode != KD_TEXT)
3057 goto quit;
3058
3059 /* undraw cursor first */
3060 if (con_is_fg(vc))
3061 hide_cursor(vc);
3062
3063 start = (ushort *)vc->vc_pos;
3064 start_x = vc->state.x;
3065 cnt = 0;
3066 while (count--) {
3067 c = *b++;
3068 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3069 if (cnt && con_is_visible(vc))
3070 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3071 cnt = 0;
3072 if (c == 8) { /* backspace */
3073 bs(vc);
3074 start = (ushort *)vc->vc_pos;
3075 start_x = vc->state.x;
3076 continue;
3077 }
3078 if (c != 13)
3079 lf(vc);
3080 cr(vc);
3081 start = (ushort *)vc->vc_pos;
3082 start_x = vc->state.x;
3083 if (c == 10 || c == 13)
3084 continue;
3085 }
3086 vc_uniscr_putc(vc, c);
3087 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3088 notify_write(vc, c);
3089 cnt++;
3090 if (vc->state.x == vc->vc_cols - 1) {
3091 vc->vc_need_wrap = 1;
3092 } else {
3093 vc->vc_pos += 2;
3094 vc->state.x++;
3095 }
3096 }
3097 if (cnt && con_is_visible(vc))
3098 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3099 set_cursor(vc);
3100 notify_update(vc);
3101
3102quit:
3103 spin_unlock(&printing_lock);
3104}
3105
3106static struct tty_driver *vt_console_device(struct console *c, int *index)
3107{
3108 *index = c->index ? c->index-1 : fg_console;
3109 return console_driver;
3110}
3111
3112static int vt_console_setup(struct console *co, char *options)
3113{
3114 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3115}
3116
3117static struct console vt_console_driver = {
3118 .name = "tty",
3119 .setup = vt_console_setup,
3120 .write = vt_console_print,
3121 .device = vt_console_device,
3122 .unblank = unblank_screen,
3123 .flags = CON_PRINTBUFFER,
3124 .index = -1,
3125};
3126#endif
3127
3128/*
3129 * Handling of Linux-specific VC ioctls
3130 */
3131
3132/*
3133 * Generally a bit racy with respect to console_lock();.
3134 *
3135 * There are some functions which don't need it.
3136 *
3137 * There are some functions which can sleep for arbitrary periods
3138 * (paste_selection) but we don't need the lock there anyway.
3139 *
3140 * set_selection_user has locking, and definitely needs it
3141 */
3142
3143int tioclinux(struct tty_struct *tty, unsigned long arg)
3144{
3145 char type, data;
3146 char __user *p = (char __user *)arg;
3147 int lines;
3148 int ret;
3149
3150 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3151 return -EPERM;
3152 if (get_user(type, p))
3153 return -EFAULT;
3154 ret = 0;
3155
3156 switch (type) {
3157 case TIOCL_SETSEL:
3158 if (!capable(CAP_SYS_ADMIN))
3159 return -EPERM;
3160 return set_selection_user((struct tiocl_selection
3161 __user *)(p+1), tty);
3162 case TIOCL_PASTESEL:
3163 if (!capable(CAP_SYS_ADMIN))
3164 return -EPERM;
3165 return paste_selection(tty);
3166 case TIOCL_UNBLANKSCREEN:
3167 console_lock();
3168 unblank_screen();
3169 console_unlock();
3170 break;
3171 case TIOCL_SELLOADLUT:
3172 if (!capable(CAP_SYS_ADMIN))
3173 return -EPERM;
3174 console_lock();
3175 ret = sel_loadlut(p);
3176 console_unlock();
3177 break;
3178 case TIOCL_GETSHIFTSTATE:
3179 /*
3180 * Make it possible to react to Shift+Mousebutton. Note that
3181 * 'shift_state' is an undocumented kernel-internal variable;
3182 * programs not closely related to the kernel should not use
3183 * this.
3184 */
3185 data = vt_get_shift_state();
3186 return put_user(data, p);
3187 case TIOCL_GETMOUSEREPORTING:
3188 console_lock(); /* May be overkill */
3189 data = mouse_reporting();
3190 console_unlock();
3191 return put_user(data, p);
3192 case TIOCL_SETVESABLANK:
3193 console_lock();
3194 ret = set_vesa_blanking(p);
3195 console_unlock();
3196 break;
3197 case TIOCL_GETKMSGREDIRECT:
3198 data = vt_get_kmsg_redirect();
3199 return put_user(data, p);
3200 case TIOCL_SETKMSGREDIRECT:
3201 if (!capable(CAP_SYS_ADMIN))
3202 return -EPERM;
3203
3204 if (get_user(data, p+1))
3205 return -EFAULT;
3206
3207 vt_kmsg_redirect(data);
3208
3209 break;
3210 case TIOCL_GETFGCONSOLE:
3211 /*
3212 * No locking needed as this is a transiently correct return
3213 * anyway if the caller hasn't disabled switching.
3214 */
3215 return fg_console;
3216 case TIOCL_SCROLLCONSOLE:
3217 if (get_user(lines, (s32 __user *)(p+4)))
3218 return -EFAULT;
3219
3220 /*
3221 * Needs the console lock here. Note that lots of other calls
3222 * need fixing before the lock is actually useful!
3223 */
3224 console_lock();
3225 scrollfront(vc_cons[fg_console].d, lines);
3226 console_unlock();
3227 break;
3228 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3229 console_lock();
3230 ignore_poke = 1;
3231 do_blank_screen(0);
3232 console_unlock();
3233 break;
3234 case TIOCL_BLANKEDSCREEN:
3235 return console_blanked;
3236 default:
3237 return -EINVAL;
3238 }
3239
3240 return ret;
3241}
3242
3243/*
3244 * /dev/ttyN handling
3245 */
3246
3247static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3248{
3249 int retval;
3250
3251 retval = do_con_write(tty, buf, count);
3252 con_flush_chars(tty);
3253
3254 return retval;
3255}
3256
3257static int con_put_char(struct tty_struct *tty, u8 ch)
3258{
3259 return do_con_write(tty, &ch, 1);
3260}
3261
3262static unsigned int con_write_room(struct tty_struct *tty)
3263{
3264 if (tty->flow.stopped)
3265 return 0;
3266 return 32768; /* No limit, really; we're not buffering */
3267}
3268
3269/*
3270 * con_throttle and con_unthrottle are only used for
3271 * paste_selection(), which has to stuff in a large number of
3272 * characters...
3273 */
3274static void con_throttle(struct tty_struct *tty)
3275{
3276}
3277
3278static void con_unthrottle(struct tty_struct *tty)
3279{
3280 struct vc_data *vc = tty->driver_data;
3281
3282 wake_up_interruptible(&vc->paste_wait);
3283}
3284
3285/*
3286 * Turn the Scroll-Lock LED on when the tty is stopped
3287 */
3288static void con_stop(struct tty_struct *tty)
3289{
3290 int console_num;
3291 if (!tty)
3292 return;
3293 console_num = tty->index;
3294 if (!vc_cons_allocated(console_num))
3295 return;
3296 vt_kbd_con_stop(console_num);
3297}
3298
3299/*
3300 * Turn the Scroll-Lock LED off when the console is started
3301 */
3302static void con_start(struct tty_struct *tty)
3303{
3304 int console_num;
3305 if (!tty)
3306 return;
3307 console_num = tty->index;
3308 if (!vc_cons_allocated(console_num))
3309 return;
3310 vt_kbd_con_start(console_num);
3311}
3312
3313static void con_flush_chars(struct tty_struct *tty)
3314{
3315 struct vc_data *vc;
3316
3317 if (in_interrupt()) /* from flush_to_ldisc */
3318 return;
3319
3320 /* if we race with con_close(), vt may be null */
3321 console_lock();
3322 vc = tty->driver_data;
3323 if (vc)
3324 set_cursor(vc);
3325 console_unlock();
3326}
3327
3328/*
3329 * Allocate the console screen memory.
3330 */
3331static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3332{
3333 unsigned int currcons = tty->index;
3334 struct vc_data *vc;
3335 int ret;
3336
3337 console_lock();
3338 ret = vc_allocate(currcons);
3339 if (ret)
3340 goto unlock;
3341
3342 vc = vc_cons[currcons].d;
3343
3344 /* Still being freed */
3345 if (vc->port.tty) {
3346 ret = -ERESTARTSYS;
3347 goto unlock;
3348 }
3349
3350 ret = tty_port_install(&vc->port, driver, tty);
3351 if (ret)
3352 goto unlock;
3353
3354 tty->driver_data = vc;
3355 vc->port.tty = tty;
3356 tty_port_get(&vc->port);
3357
3358 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3359 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3360 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3361 }
3362 if (vc->vc_utf)
3363 tty->termios.c_iflag |= IUTF8;
3364 else
3365 tty->termios.c_iflag &= ~IUTF8;
3366unlock:
3367 console_unlock();
3368 return ret;
3369}
3370
3371static int con_open(struct tty_struct *tty, struct file *filp)
3372{
3373 /* everything done in install */
3374 return 0;
3375}
3376
3377
3378static void con_close(struct tty_struct *tty, struct file *filp)
3379{
3380 /* Nothing to do - we defer to shutdown */
3381}
3382
3383static void con_shutdown(struct tty_struct *tty)
3384{
3385 struct vc_data *vc = tty->driver_data;
3386 BUG_ON(vc == NULL);
3387 console_lock();
3388 vc->port.tty = NULL;
3389 console_unlock();
3390}
3391
3392static void con_cleanup(struct tty_struct *tty)
3393{
3394 struct vc_data *vc = tty->driver_data;
3395
3396 tty_port_put(&vc->port);
3397}
3398
3399static int default_color = 7; /* white */
3400static int default_italic_color = 2; // green (ASCII)
3401static int default_underline_color = 3; // cyan (ASCII)
3402module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3403module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3404module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3405
3406static void vc_init(struct vc_data *vc, int do_clear)
3407{
3408 int j, k ;
3409
3410 set_origin(vc);
3411 vc->vc_pos = vc->vc_origin;
3412 reset_vc(vc);
3413 for (j=k=0; j<16; j++) {
3414 vc->vc_palette[k++] = default_red[j] ;
3415 vc->vc_palette[k++] = default_grn[j] ;
3416 vc->vc_palette[k++] = default_blu[j] ;
3417 }
3418 vc->vc_def_color = default_color;
3419 vc->vc_ulcolor = default_underline_color;
3420 vc->vc_itcolor = default_italic_color;
3421 vc->vc_halfcolor = 0x08; /* grey */
3422 init_waitqueue_head(&vc->paste_wait);
3423 reset_terminal(vc, do_clear);
3424}
3425
3426/*
3427 * This routine initializes console interrupts, and does nothing
3428 * else. If you want the screen to clear, call tty_write with
3429 * the appropriate escape-sequence.
3430 */
3431
3432static int __init con_init(void)
3433{
3434 const char *display_desc = NULL;
3435 struct vc_data *vc;
3436 unsigned int currcons = 0, i;
3437
3438 console_lock();
3439
3440 if (!conswitchp)
3441 conswitchp = &dummy_con;
3442 display_desc = conswitchp->con_startup();
3443 if (!display_desc) {
3444 fg_console = 0;
3445 console_unlock();
3446 return 0;
3447 }
3448
3449 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450 struct con_driver *con_driver = ®istered_con_driver[i];
3451
3452 if (con_driver->con == NULL) {
3453 con_driver->con = conswitchp;
3454 con_driver->desc = display_desc;
3455 con_driver->flag = CON_DRIVER_FLAG_INIT;
3456 con_driver->first = 0;
3457 con_driver->last = MAX_NR_CONSOLES - 1;
3458 break;
3459 }
3460 }
3461
3462 for (i = 0; i < MAX_NR_CONSOLES; i++)
3463 con_driver_map[i] = conswitchp;
3464
3465 if (blankinterval) {
3466 blank_state = blank_normal_wait;
3467 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3468 }
3469
3470 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3471 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3472 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3473 tty_port_init(&vc->port);
3474 visual_init(vc, currcons, 1);
3475 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3476 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3477 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
3478 }
3479 currcons = fg_console = 0;
3480 master_display_fg = vc = vc_cons[currcons].d;
3481 set_origin(vc);
3482 save_screen(vc);
3483 gotoxy(vc, vc->state.x, vc->state.y);
3484 csi_J(vc, 0);
3485 update_screen(vc);
3486 pr_info("Console: %s %s %dx%d\n",
3487 vc->vc_can_do_color ? "colour" : "mono",
3488 display_desc, vc->vc_cols, vc->vc_rows);
3489
3490 console_unlock();
3491
3492#ifdef CONFIG_VT_CONSOLE
3493 register_console(&vt_console_driver);
3494#endif
3495 return 0;
3496}
3497console_initcall(con_init);
3498
3499static const struct tty_operations con_ops = {
3500 .install = con_install,
3501 .open = con_open,
3502 .close = con_close,
3503 .write = con_write,
3504 .write_room = con_write_room,
3505 .put_char = con_put_char,
3506 .flush_chars = con_flush_chars,
3507 .ioctl = vt_ioctl,
3508#ifdef CONFIG_COMPAT
3509 .compat_ioctl = vt_compat_ioctl,
3510#endif
3511 .stop = con_stop,
3512 .start = con_start,
3513 .throttle = con_throttle,
3514 .unthrottle = con_unthrottle,
3515 .resize = vt_resize,
3516 .shutdown = con_shutdown,
3517 .cleanup = con_cleanup,
3518};
3519
3520static struct cdev vc0_cdev;
3521
3522static ssize_t show_tty_active(struct device *dev,
3523 struct device_attribute *attr, char *buf)
3524{
3525 return sprintf(buf, "tty%d\n", fg_console + 1);
3526}
3527static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3528
3529static struct attribute *vt_dev_attrs[] = {
3530 &dev_attr_active.attr,
3531 NULL
3532};
3533
3534ATTRIBUTE_GROUPS(vt_dev);
3535
3536int __init vty_init(const struct file_operations *console_fops)
3537{
3538 cdev_init(&vc0_cdev, console_fops);
3539 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3540 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3541 panic("Couldn't register /dev/tty0 driver\n");
3542 tty0dev = device_create_with_groups(&tty_class, NULL,
3543 MKDEV(TTY_MAJOR, 0), NULL,
3544 vt_dev_groups, "tty0");
3545 if (IS_ERR(tty0dev))
3546 tty0dev = NULL;
3547
3548 vcs_init();
3549
3550 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3551 TTY_DRIVER_RESET_TERMIOS);
3552 if (IS_ERR(console_driver))
3553 panic("Couldn't allocate console driver\n");
3554
3555 console_driver->name = "tty";
3556 console_driver->name_base = 1;
3557 console_driver->major = TTY_MAJOR;
3558 console_driver->minor_start = 1;
3559 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3560 console_driver->init_termios = tty_std_termios;
3561 if (default_utf8)
3562 console_driver->init_termios.c_iflag |= IUTF8;
3563 tty_set_operations(console_driver, &con_ops);
3564 if (tty_register_driver(console_driver))
3565 panic("Couldn't register console driver\n");
3566 kbd_init();
3567 console_map_init();
3568#ifdef CONFIG_MDA_CONSOLE
3569 mda_console_init();
3570#endif
3571 return 0;
3572}
3573
3574static const struct class vtconsole_class = {
3575 .name = "vtconsole",
3576};
3577
3578static int do_bind_con_driver(const struct consw *csw, int first, int last,
3579 int deflt)
3580{
3581 struct module *owner = csw->owner;
3582 const char *desc = NULL;
3583 struct con_driver *con_driver;
3584 int i, j = -1, k = -1, retval = -ENODEV;
3585
3586 if (!try_module_get(owner))
3587 return -ENODEV;
3588
3589 WARN_CONSOLE_UNLOCKED();
3590
3591 /* check if driver is registered */
3592 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3593 con_driver = ®istered_con_driver[i];
3594
3595 if (con_driver->con == csw) {
3596 desc = con_driver->desc;
3597 retval = 0;
3598 break;
3599 }
3600 }
3601
3602 if (retval)
3603 goto err;
3604
3605 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3606 csw->con_startup();
3607 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3608 }
3609
3610 if (deflt) {
3611 if (conswitchp)
3612 module_put(conswitchp->owner);
3613
3614 __module_get(owner);
3615 conswitchp = csw;
3616 }
3617
3618 first = max(first, con_driver->first);
3619 last = min(last, con_driver->last);
3620
3621 for (i = first; i <= last; i++) {
3622 int old_was_color;
3623 struct vc_data *vc = vc_cons[i].d;
3624
3625 if (con_driver_map[i])
3626 module_put(con_driver_map[i]->owner);
3627 __module_get(owner);
3628 con_driver_map[i] = csw;
3629
3630 if (!vc || !vc->vc_sw)
3631 continue;
3632
3633 j = i;
3634
3635 if (con_is_visible(vc)) {
3636 k = i;
3637 save_screen(vc);
3638 }
3639
3640 old_was_color = vc->vc_can_do_color;
3641 vc->vc_sw->con_deinit(vc);
3642 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3643 visual_init(vc, i, 0);
3644 set_origin(vc);
3645 update_attr(vc);
3646
3647 /* If the console changed between mono <-> color, then
3648 * the attributes in the screenbuf will be wrong. The
3649 * following resets all attributes to something sane.
3650 */
3651 if (old_was_color != vc->vc_can_do_color)
3652 clear_buffer_attributes(vc);
3653 }
3654
3655 pr_info("Console: switching ");
3656 if (!deflt)
3657 pr_cont("consoles %d-%d ", first + 1, last + 1);
3658 if (j >= 0) {
3659 struct vc_data *vc = vc_cons[j].d;
3660
3661 pr_cont("to %s %s %dx%d\n",
3662 vc->vc_can_do_color ? "colour" : "mono",
3663 desc, vc->vc_cols, vc->vc_rows);
3664
3665 if (k >= 0) {
3666 vc = vc_cons[k].d;
3667 update_screen(vc);
3668 }
3669 } else {
3670 pr_cont("to %s\n", desc);
3671 }
3672
3673 retval = 0;
3674err:
3675 module_put(owner);
3676 return retval;
3677};
3678
3679
3680#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3681int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3682{
3683 struct module *owner = csw->owner;
3684 const struct consw *defcsw = NULL;
3685 struct con_driver *con_driver = NULL, *con_back = NULL;
3686 int i, retval = -ENODEV;
3687
3688 if (!try_module_get(owner))
3689 return -ENODEV;
3690
3691 WARN_CONSOLE_UNLOCKED();
3692
3693 /* check if driver is registered and if it is unbindable */
3694 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3695 con_driver = ®istered_con_driver[i];
3696
3697 if (con_driver->con == csw &&
3698 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3699 retval = 0;
3700 break;
3701 }
3702 }
3703
3704 if (retval)
3705 goto err;
3706
3707 retval = -ENODEV;
3708
3709 /* check if backup driver exists */
3710 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3711 con_back = ®istered_con_driver[i];
3712
3713 if (con_back->con && con_back->con != csw) {
3714 defcsw = con_back->con;
3715 retval = 0;
3716 break;
3717 }
3718 }
3719
3720 if (retval)
3721 goto err;
3722
3723 if (!con_is_bound(csw))
3724 goto err;
3725
3726 first = max(first, con_driver->first);
3727 last = min(last, con_driver->last);
3728
3729 for (i = first; i <= last; i++) {
3730 if (con_driver_map[i] == csw) {
3731 module_put(csw->owner);
3732 con_driver_map[i] = NULL;
3733 }
3734 }
3735
3736 if (!con_is_bound(defcsw)) {
3737 const struct consw *defconsw = conswitchp;
3738
3739 defcsw->con_startup();
3740 con_back->flag |= CON_DRIVER_FLAG_INIT;
3741 /*
3742 * vgacon may change the default driver to point
3743 * to dummycon, we restore it here...
3744 */
3745 conswitchp = defconsw;
3746 }
3747
3748 if (!con_is_bound(csw))
3749 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3750
3751 /* ignore return value, binding should not fail */
3752 do_bind_con_driver(defcsw, first, last, deflt);
3753err:
3754 module_put(owner);
3755 return retval;
3756
3757}
3758EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3759
3760static int vt_bind(struct con_driver *con)
3761{
3762 const struct consw *defcsw = NULL, *csw = NULL;
3763 int i, more = 1, first = -1, last = -1, deflt = 0;
3764
3765 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3766 goto err;
3767
3768 csw = con->con;
3769
3770 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771 struct con_driver *con = ®istered_con_driver[i];
3772
3773 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3774 defcsw = con->con;
3775 break;
3776 }
3777 }
3778
3779 if (!defcsw)
3780 goto err;
3781
3782 while (more) {
3783 more = 0;
3784
3785 for (i = con->first; i <= con->last; i++) {
3786 if (con_driver_map[i] == defcsw) {
3787 if (first == -1)
3788 first = i;
3789 last = i;
3790 more = 1;
3791 } else if (first != -1)
3792 break;
3793 }
3794
3795 if (first == 0 && last == MAX_NR_CONSOLES -1)
3796 deflt = 1;
3797
3798 if (first != -1)
3799 do_bind_con_driver(csw, first, last, deflt);
3800
3801 first = -1;
3802 last = -1;
3803 deflt = 0;
3804 }
3805
3806err:
3807 return 0;
3808}
3809
3810static int vt_unbind(struct con_driver *con)
3811{
3812 const struct consw *csw = NULL;
3813 int i, more = 1, first = -1, last = -1, deflt = 0;
3814 int ret;
3815
3816 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3817 goto err;
3818
3819 csw = con->con;
3820
3821 while (more) {
3822 more = 0;
3823
3824 for (i = con->first; i <= con->last; i++) {
3825 if (con_driver_map[i] == csw) {
3826 if (first == -1)
3827 first = i;
3828 last = i;
3829 more = 1;
3830 } else if (first != -1)
3831 break;
3832 }
3833
3834 if (first == 0 && last == MAX_NR_CONSOLES -1)
3835 deflt = 1;
3836
3837 if (first != -1) {
3838 ret = do_unbind_con_driver(csw, first, last, deflt);
3839 if (ret != 0)
3840 return ret;
3841 }
3842
3843 first = -1;
3844 last = -1;
3845 deflt = 0;
3846 }
3847
3848err:
3849 return 0;
3850}
3851#else
3852static inline int vt_bind(struct con_driver *con)
3853{
3854 return 0;
3855}
3856static inline int vt_unbind(struct con_driver *con)
3857{
3858 return 0;
3859}
3860#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3861
3862static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3863 const char *buf, size_t count)
3864{
3865 struct con_driver *con = dev_get_drvdata(dev);
3866 int bind = simple_strtoul(buf, NULL, 0);
3867
3868 console_lock();
3869
3870 if (bind)
3871 vt_bind(con);
3872 else
3873 vt_unbind(con);
3874
3875 console_unlock();
3876
3877 return count;
3878}
3879
3880static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3881 char *buf)
3882{
3883 struct con_driver *con = dev_get_drvdata(dev);
3884 int bind;
3885
3886 console_lock();
3887 bind = con_is_bound(con->con);
3888 console_unlock();
3889
3890 return sysfs_emit(buf, "%i\n", bind);
3891}
3892
3893static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3894 char *buf)
3895{
3896 struct con_driver *con = dev_get_drvdata(dev);
3897
3898 return sysfs_emit(buf, "%s %s\n",
3899 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3900 con->desc);
3901
3902}
3903
3904static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3905static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3906
3907static struct attribute *con_dev_attrs[] = {
3908 &dev_attr_bind.attr,
3909 &dev_attr_name.attr,
3910 NULL
3911};
3912
3913ATTRIBUTE_GROUPS(con_dev);
3914
3915static int vtconsole_init_device(struct con_driver *con)
3916{
3917 con->flag |= CON_DRIVER_FLAG_ATTR;
3918 return 0;
3919}
3920
3921static void vtconsole_deinit_device(struct con_driver *con)
3922{
3923 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3924}
3925
3926/**
3927 * con_is_bound - checks if driver is bound to the console
3928 * @csw: console driver
3929 *
3930 * RETURNS: zero if unbound, nonzero if bound
3931 *
3932 * Drivers can call this and if zero, they should release
3933 * all resources allocated on con_startup()
3934 */
3935int con_is_bound(const struct consw *csw)
3936{
3937 int i, bound = 0;
3938
3939 WARN_CONSOLE_UNLOCKED();
3940
3941 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3942 if (con_driver_map[i] == csw) {
3943 bound = 1;
3944 break;
3945 }
3946 }
3947
3948 return bound;
3949}
3950EXPORT_SYMBOL(con_is_bound);
3951
3952/**
3953 * con_is_visible - checks whether the current console is visible
3954 * @vc: virtual console
3955 *
3956 * RETURNS: zero if not visible, nonzero if visible
3957 */
3958bool con_is_visible(const struct vc_data *vc)
3959{
3960 WARN_CONSOLE_UNLOCKED();
3961
3962 return *vc->vc_display_fg == vc;
3963}
3964EXPORT_SYMBOL(con_is_visible);
3965
3966/**
3967 * con_debug_enter - prepare the console for the kernel debugger
3968 * @vc: virtual console
3969 *
3970 * Called when the console is taken over by the kernel debugger, this
3971 * function needs to save the current console state, then put the console
3972 * into a state suitable for the kernel debugger.
3973 *
3974 * RETURNS:
3975 * Zero on success, nonzero if a failure occurred when trying to prepare
3976 * the console for the debugger.
3977 */
3978int con_debug_enter(struct vc_data *vc)
3979{
3980 int ret = 0;
3981
3982 saved_fg_console = fg_console;
3983 saved_last_console = last_console;
3984 saved_want_console = want_console;
3985 saved_vc_mode = vc->vc_mode;
3986 saved_console_blanked = console_blanked;
3987 vc->vc_mode = KD_TEXT;
3988 console_blanked = 0;
3989 if (vc->vc_sw->con_debug_enter)
3990 ret = vc->vc_sw->con_debug_enter(vc);
3991#ifdef CONFIG_KGDB_KDB
3992 /* Set the initial LINES variable if it is not already set */
3993 if (vc->vc_rows < 999) {
3994 int linecount;
3995 char lns[4];
3996 const char *setargs[3] = {
3997 "set",
3998 "LINES",
3999 lns,
4000 };
4001 if (kdbgetintenv(setargs[0], &linecount)) {
4002 snprintf(lns, 4, "%i", vc->vc_rows);
4003 kdb_set(2, setargs);
4004 }
4005 }
4006 if (vc->vc_cols < 999) {
4007 int colcount;
4008 char cols[4];
4009 const char *setargs[3] = {
4010 "set",
4011 "COLUMNS",
4012 cols,
4013 };
4014 if (kdbgetintenv(setargs[0], &colcount)) {
4015 snprintf(cols, 4, "%i", vc->vc_cols);
4016 kdb_set(2, setargs);
4017 }
4018 }
4019#endif /* CONFIG_KGDB_KDB */
4020 return ret;
4021}
4022EXPORT_SYMBOL_GPL(con_debug_enter);
4023
4024/**
4025 * con_debug_leave - restore console state
4026 *
4027 * Restore the console state to what it was before the kernel debugger
4028 * was invoked.
4029 *
4030 * RETURNS:
4031 * Zero on success, nonzero if a failure occurred when trying to restore
4032 * the console.
4033 */
4034int con_debug_leave(void)
4035{
4036 struct vc_data *vc;
4037 int ret = 0;
4038
4039 fg_console = saved_fg_console;
4040 last_console = saved_last_console;
4041 want_console = saved_want_console;
4042 console_blanked = saved_console_blanked;
4043 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4044
4045 vc = vc_cons[fg_console].d;
4046 if (vc->vc_sw->con_debug_leave)
4047 ret = vc->vc_sw->con_debug_leave(vc);
4048 return ret;
4049}
4050EXPORT_SYMBOL_GPL(con_debug_leave);
4051
4052static int do_register_con_driver(const struct consw *csw, int first, int last)
4053{
4054 struct module *owner = csw->owner;
4055 struct con_driver *con_driver;
4056 const char *desc;
4057 int i, retval;
4058
4059 WARN_CONSOLE_UNLOCKED();
4060
4061 if (!try_module_get(owner))
4062 return -ENODEV;
4063
4064 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4065 con_driver = ®istered_con_driver[i];
4066
4067 /* already registered */
4068 if (con_driver->con == csw) {
4069 retval = -EBUSY;
4070 goto err;
4071 }
4072 }
4073
4074 desc = csw->con_startup();
4075 if (!desc) {
4076 retval = -ENODEV;
4077 goto err;
4078 }
4079
4080 retval = -EINVAL;
4081
4082 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4083 con_driver = ®istered_con_driver[i];
4084
4085 if (con_driver->con == NULL &&
4086 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4087 con_driver->con = csw;
4088 con_driver->desc = desc;
4089 con_driver->node = i;
4090 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4091 CON_DRIVER_FLAG_INIT;
4092 con_driver->first = first;
4093 con_driver->last = last;
4094 retval = 0;
4095 break;
4096 }
4097 }
4098
4099 if (retval)
4100 goto err;
4101
4102 con_driver->dev =
4103 device_create_with_groups(&vtconsole_class, NULL,
4104 MKDEV(0, con_driver->node),
4105 con_driver, con_dev_groups,
4106 "vtcon%i", con_driver->node);
4107 if (IS_ERR(con_driver->dev)) {
4108 pr_warn("Unable to create device for %s; errno = %ld\n",
4109 con_driver->desc, PTR_ERR(con_driver->dev));
4110 con_driver->dev = NULL;
4111 } else {
4112 vtconsole_init_device(con_driver);
4113 }
4114
4115err:
4116 module_put(owner);
4117 return retval;
4118}
4119
4120
4121/**
4122 * do_unregister_con_driver - unregister console driver from console layer
4123 * @csw: console driver
4124 *
4125 * DESCRIPTION: All drivers that registers to the console layer must
4126 * call this function upon exit, or if the console driver is in a state
4127 * where it won't be able to handle console services, such as the
4128 * framebuffer console without loaded framebuffer drivers.
4129 *
4130 * The driver must unbind first prior to unregistration.
4131 */
4132int do_unregister_con_driver(const struct consw *csw)
4133{
4134 int i;
4135
4136 /* cannot unregister a bound driver */
4137 if (con_is_bound(csw))
4138 return -EBUSY;
4139
4140 if (csw == conswitchp)
4141 return -EINVAL;
4142
4143 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4144 struct con_driver *con_driver = ®istered_con_driver[i];
4145
4146 if (con_driver->con == csw) {
4147 /*
4148 * Defer the removal of the sysfs entries since that
4149 * will acquire the kernfs s_active lock and we can't
4150 * acquire this lock while holding the console lock:
4151 * the unbind sysfs entry imposes already the opposite
4152 * order. Reset con already here to prevent any later
4153 * lookup to succeed and mark this slot as zombie, so
4154 * it won't get reused until we complete the removal
4155 * in the deferred work.
4156 */
4157 con_driver->con = NULL;
4158 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4159 schedule_work(&con_driver_unregister_work);
4160
4161 return 0;
4162 }
4163 }
4164
4165 return -ENODEV;
4166}
4167EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4168
4169static void con_driver_unregister_callback(struct work_struct *ignored)
4170{
4171 int i;
4172
4173 console_lock();
4174
4175 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4176 struct con_driver *con_driver = ®istered_con_driver[i];
4177
4178 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4179 continue;
4180
4181 console_unlock();
4182
4183 vtconsole_deinit_device(con_driver);
4184 device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
4185
4186 console_lock();
4187
4188 if (WARN_ON_ONCE(con_driver->con))
4189 con_driver->con = NULL;
4190 con_driver->desc = NULL;
4191 con_driver->dev = NULL;
4192 con_driver->node = 0;
4193 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4194 con_driver->flag = 0;
4195 con_driver->first = 0;
4196 con_driver->last = 0;
4197 }
4198
4199 console_unlock();
4200}
4201
4202/*
4203 * If we support more console drivers, this function is used
4204 * when a driver wants to take over some existing consoles
4205 * and become default driver for newly opened ones.
4206 *
4207 * do_take_over_console is basically a register followed by bind
4208 */
4209int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4210{
4211 int err;
4212
4213 err = do_register_con_driver(csw, first, last);
4214 /*
4215 * If we get an busy error we still want to bind the console driver
4216 * and return success, as we may have unbound the console driver
4217 * but not unregistered it.
4218 */
4219 if (err == -EBUSY)
4220 err = 0;
4221 if (!err)
4222 do_bind_con_driver(csw, first, last, deflt);
4223
4224 return err;
4225}
4226EXPORT_SYMBOL_GPL(do_take_over_console);
4227
4228
4229/*
4230 * give_up_console is a wrapper to unregister_con_driver. It will only
4231 * work if driver is fully unbound.
4232 */
4233void give_up_console(const struct consw *csw)
4234{
4235 console_lock();
4236 do_unregister_con_driver(csw);
4237 console_unlock();
4238}
4239EXPORT_SYMBOL(give_up_console);
4240
4241static int __init vtconsole_class_init(void)
4242{
4243 int i;
4244
4245 i = class_register(&vtconsole_class);
4246 if (i)
4247 pr_warn("Unable to create vt console class; errno = %d\n", i);
4248
4249 /* Add system drivers to sysfs */
4250 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4251 struct con_driver *con = ®istered_con_driver[i];
4252
4253 if (con->con && !con->dev) {
4254 con->dev =
4255 device_create_with_groups(&vtconsole_class, NULL,
4256 MKDEV(0, con->node),
4257 con, con_dev_groups,
4258 "vtcon%i", con->node);
4259
4260 if (IS_ERR(con->dev)) {
4261 pr_warn("Unable to create device for %s; errno = %ld\n",
4262 con->desc, PTR_ERR(con->dev));
4263 con->dev = NULL;
4264 } else {
4265 vtconsole_init_device(con);
4266 }
4267 }
4268 }
4269
4270 return 0;
4271}
4272postcore_initcall(vtconsole_class_init);
4273
4274/*
4275 * Screen blanking
4276 */
4277
4278static int set_vesa_blanking(char __user *p)
4279{
4280 unsigned int mode;
4281
4282 if (get_user(mode, p + 1))
4283 return -EFAULT;
4284
4285 vesa_blank_mode = (mode < 4) ? mode : 0;
4286 return 0;
4287}
4288
4289void do_blank_screen(int entering_gfx)
4290{
4291 struct vc_data *vc = vc_cons[fg_console].d;
4292 int i;
4293
4294 might_sleep();
4295
4296 WARN_CONSOLE_UNLOCKED();
4297
4298 if (console_blanked) {
4299 if (blank_state == blank_vesa_wait) {
4300 blank_state = blank_off;
4301 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4302 }
4303 return;
4304 }
4305
4306 /* entering graphics mode? */
4307 if (entering_gfx) {
4308 hide_cursor(vc);
4309 save_screen(vc);
4310 vc->vc_sw->con_blank(vc, -1, 1);
4311 console_blanked = fg_console + 1;
4312 blank_state = blank_off;
4313 set_origin(vc);
4314 return;
4315 }
4316
4317 blank_state = blank_off;
4318
4319 /* don't blank graphics */
4320 if (vc->vc_mode != KD_TEXT) {
4321 console_blanked = fg_console + 1;
4322 return;
4323 }
4324
4325 hide_cursor(vc);
4326 del_timer_sync(&console_timer);
4327 blank_timer_expired = 0;
4328
4329 save_screen(vc);
4330 /* In case we need to reset origin, blanking hook returns 1 */
4331 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4332 console_blanked = fg_console + 1;
4333 if (i)
4334 set_origin(vc);
4335
4336 if (console_blank_hook && console_blank_hook(1))
4337 return;
4338
4339 if (vesa_off_interval && vesa_blank_mode) {
4340 blank_state = blank_vesa_wait;
4341 mod_timer(&console_timer, jiffies + vesa_off_interval);
4342 }
4343 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4344}
4345EXPORT_SYMBOL(do_blank_screen);
4346
4347/*
4348 * Called by timer as well as from vt_console_driver
4349 */
4350void do_unblank_screen(int leaving_gfx)
4351{
4352 struct vc_data *vc;
4353
4354 /* This should now always be called from a "sane" (read: can schedule)
4355 * context for the sake of the low level drivers, except in the special
4356 * case of oops_in_progress
4357 */
4358 if (!oops_in_progress)
4359 might_sleep();
4360
4361 WARN_CONSOLE_UNLOCKED();
4362
4363 ignore_poke = 0;
4364 if (!console_blanked)
4365 return;
4366 if (!vc_cons_allocated(fg_console)) {
4367 /* impossible */
4368 pr_warn("unblank_screen: tty %d not allocated ??\n",
4369 fg_console + 1);
4370 return;
4371 }
4372 vc = vc_cons[fg_console].d;
4373 if (vc->vc_mode != KD_TEXT)
4374 return; /* but leave console_blanked != 0 */
4375
4376 if (blankinterval) {
4377 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4378 blank_state = blank_normal_wait;
4379 }
4380
4381 console_blanked = 0;
4382 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4383 /* Low-level driver cannot restore -> do it ourselves */
4384 update_screen(vc);
4385 if (console_blank_hook)
4386 console_blank_hook(0);
4387 set_palette(vc);
4388 set_cursor(vc);
4389 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4390}
4391EXPORT_SYMBOL(do_unblank_screen);
4392
4393/*
4394 * This is called by the outside world to cause a forced unblank, mostly for
4395 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4396 * call it with 1 as an argument and so force a mode restore... that may kill
4397 * X or at least garbage the screen but would also make the Oops visible...
4398 */
4399static void unblank_screen(void)
4400{
4401 do_unblank_screen(0);
4402}
4403
4404/*
4405 * We defer the timer blanking to work queue so it can take the console mutex
4406 * (console operations can still happen at irq time, but only from printk which
4407 * has the console mutex. Not perfect yet, but better than no locking
4408 */
4409static void blank_screen_t(struct timer_list *unused)
4410{
4411 blank_timer_expired = 1;
4412 schedule_work(&console_work);
4413}
4414
4415void poke_blanked_console(void)
4416{
4417 WARN_CONSOLE_UNLOCKED();
4418
4419 /* Add this so we quickly catch whoever might call us in a non
4420 * safe context. Nowadays, unblank_screen() isn't to be called in
4421 * atomic contexts and is allowed to schedule (with the special case
4422 * of oops_in_progress, but that isn't of any concern for this
4423 * function. --BenH.
4424 */
4425 might_sleep();
4426
4427 /* This isn't perfectly race free, but a race here would be mostly harmless,
4428 * at worst, we'll do a spurious blank and it's unlikely
4429 */
4430 del_timer(&console_timer);
4431 blank_timer_expired = 0;
4432
4433 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4434 return;
4435 if (console_blanked)
4436 unblank_screen();
4437 else if (blankinterval) {
4438 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4439 blank_state = blank_normal_wait;
4440 }
4441}
4442
4443/*
4444 * Palettes
4445 */
4446
4447static void set_palette(struct vc_data *vc)
4448{
4449 WARN_CONSOLE_UNLOCKED();
4450
4451 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4452 vc->vc_sw->con_set_palette(vc, color_table);
4453}
4454
4455/*
4456 * Load palette into the DAC registers. arg points to a colour
4457 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4458 */
4459
4460int con_set_cmap(unsigned char __user *arg)
4461{
4462 int i, j, k;
4463 unsigned char colormap[3*16];
4464
4465 if (copy_from_user(colormap, arg, sizeof(colormap)))
4466 return -EFAULT;
4467
4468 console_lock();
4469 for (i = k = 0; i < 16; i++) {
4470 default_red[i] = colormap[k++];
4471 default_grn[i] = colormap[k++];
4472 default_blu[i] = colormap[k++];
4473 }
4474 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4475 if (!vc_cons_allocated(i))
4476 continue;
4477 for (j = k = 0; j < 16; j++) {
4478 vc_cons[i].d->vc_palette[k++] = default_red[j];
4479 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4480 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4481 }
4482 set_palette(vc_cons[i].d);
4483 }
4484 console_unlock();
4485
4486 return 0;
4487}
4488
4489int con_get_cmap(unsigned char __user *arg)
4490{
4491 int i, k;
4492 unsigned char colormap[3*16];
4493
4494 console_lock();
4495 for (i = k = 0; i < 16; i++) {
4496 colormap[k++] = default_red[i];
4497 colormap[k++] = default_grn[i];
4498 colormap[k++] = default_blu[i];
4499 }
4500 console_unlock();
4501
4502 if (copy_to_user(arg, colormap, sizeof(colormap)))
4503 return -EFAULT;
4504
4505 return 0;
4506}
4507
4508void reset_palette(struct vc_data *vc)
4509{
4510 int j, k;
4511 for (j=k=0; j<16; j++) {
4512 vc->vc_palette[k++] = default_red[j];
4513 vc->vc_palette[k++] = default_grn[j];
4514 vc->vc_palette[k++] = default_blu[j];
4515 }
4516 set_palette(vc);
4517}
4518
4519/*
4520 * Font switching
4521 *
4522 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4523 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4524 * (shorts/ints, depending on width) reserved for each character which is
4525 * kinda wasty, but this is done in order to maintain compatibility with the
4526 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4527 * into its favorite format (maybe we should add a `fontoffset' field to the
4528 * `display' structure so we won't have to convert the fontdata all the time.
4529 * /Jes
4530 */
4531
4532#define max_font_width 64
4533#define max_font_height 128
4534#define max_font_glyphs 512
4535#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4536
4537static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4538{
4539 struct console_font font;
4540 int rc = -EINVAL;
4541 int c;
4542 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4543
4544 if (vpitch > max_font_height)
4545 return -EINVAL;
4546
4547 if (op->data) {
4548 font.data = kvmalloc(max_font_size, GFP_KERNEL);
4549 if (!font.data)
4550 return -ENOMEM;
4551 } else
4552 font.data = NULL;
4553
4554 console_lock();
4555 if (vc->vc_mode != KD_TEXT)
4556 rc = -EINVAL;
4557 else if (vc->vc_sw->con_font_get)
4558 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
4559 else
4560 rc = -ENOSYS;
4561 console_unlock();
4562
4563 if (rc)
4564 goto out;
4565
4566 c = (font.width+7)/8 * vpitch * font.charcount;
4567
4568 if (op->data && font.charcount > op->charcount)
4569 rc = -ENOSPC;
4570 if (font.width > op->width || font.height > op->height)
4571 rc = -ENOSPC;
4572 if (rc)
4573 goto out;
4574
4575 op->height = font.height;
4576 op->width = font.width;
4577 op->charcount = font.charcount;
4578
4579 if (op->data && copy_to_user(op->data, font.data, c))
4580 rc = -EFAULT;
4581
4582out:
4583 kvfree(font.data);
4584 return rc;
4585}
4586
4587static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4588{
4589 struct console_font font;
4590 int rc = -EINVAL;
4591 int size;
4592 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4593
4594 if (vc->vc_mode != KD_TEXT)
4595 return -EINVAL;
4596 if (!op->data)
4597 return -EINVAL;
4598 if (op->charcount > max_font_glyphs)
4599 return -EINVAL;
4600 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4601 op->height > max_font_height)
4602 return -EINVAL;
4603 if (vpitch < op->height)
4604 return -EINVAL;
4605 size = (op->width+7)/8 * vpitch * op->charcount;
4606 if (size > max_font_size)
4607 return -ENOSPC;
4608
4609 font.data = memdup_user(op->data, size);
4610 if (IS_ERR(font.data))
4611 return PTR_ERR(font.data);
4612
4613 font.charcount = op->charcount;
4614 font.width = op->width;
4615 font.height = op->height;
4616
4617 console_lock();
4618 if (vc->vc_mode != KD_TEXT)
4619 rc = -EINVAL;
4620 else if (vc->vc_sw->con_font_set) {
4621 if (vc_is_sel(vc))
4622 clear_selection();
4623 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4624 } else
4625 rc = -ENOSYS;
4626 console_unlock();
4627 kfree(font.data);
4628 return rc;
4629}
4630
4631static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4632{
4633 struct console_font font = {.width = op->width, .height = op->height};
4634 char name[MAX_FONT_NAME];
4635 char *s = name;
4636 int rc;
4637
4638
4639 if (!op->data)
4640 s = NULL;
4641 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4642 return -EFAULT;
4643 else
4644 name[MAX_FONT_NAME - 1] = 0;
4645
4646 console_lock();
4647 if (vc->vc_mode != KD_TEXT) {
4648 console_unlock();
4649 return -EINVAL;
4650 }
4651 if (vc->vc_sw->con_font_default) {
4652 if (vc_is_sel(vc))
4653 clear_selection();
4654 rc = vc->vc_sw->con_font_default(vc, &font, s);
4655 } else
4656 rc = -ENOSYS;
4657 console_unlock();
4658 if (!rc) {
4659 op->width = font.width;
4660 op->height = font.height;
4661 }
4662 return rc;
4663}
4664
4665int con_font_op(struct vc_data *vc, struct console_font_op *op)
4666{
4667 switch (op->op) {
4668 case KD_FONT_OP_SET:
4669 case KD_FONT_OP_SET_TALL:
4670 return con_font_set(vc, op);
4671 case KD_FONT_OP_GET:
4672 case KD_FONT_OP_GET_TALL:
4673 return con_font_get(vc, op);
4674 case KD_FONT_OP_SET_DEFAULT:
4675 return con_font_default(vc, op);
4676 case KD_FONT_OP_COPY:
4677 /* was buggy and never really used */
4678 return -EINVAL;
4679 }
4680 return -ENOSYS;
4681}
4682
4683/*
4684 * Interface exported to selection and vcs.
4685 */
4686
4687/* used by selection */
4688u16 screen_glyph(const struct vc_data *vc, int offset)
4689{
4690 u16 w = scr_readw(screenpos(vc, offset, true));
4691 u16 c = w & 0xff;
4692
4693 if (w & vc->vc_hi_font_mask)
4694 c |= 0x100;
4695 return c;
4696}
4697EXPORT_SYMBOL_GPL(screen_glyph);
4698
4699u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4700{
4701 u32 **uni_lines = vc->vc_uni_lines;
4702
4703 if (uni_lines)
4704 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4705
4706 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4707}
4708EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4709
4710/* used by vcs - note the word offset */
4711unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4712{
4713 return screenpos(vc, 2 * w_offset, viewed);
4714}
4715EXPORT_SYMBOL_GPL(screen_pos);
4716
4717void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4718{
4719 /* clamp values if they don't fit */
4720 xy[0] = min(vc->state.x, 0xFFu);
4721 xy[1] = min(vc->state.y, 0xFFu);
4722}
4723
4724void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4725{
4726 hide_cursor(vc);
4727 gotoxy(vc, xy[0], xy[1]);
4728 set_cursor(vc);
4729}
4730
4731u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4732{
4733 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4734 return softcursor_original;
4735 return scr_readw(org);
4736}
4737
4738void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4739{
4740 scr_writew(val, org);
4741 if ((unsigned long)org == vc->vc_pos) {
4742 softcursor_original = -1;
4743 add_softcursor(vc);
4744 }
4745}
4746
4747void vcs_scr_updated(struct vc_data *vc)
4748{
4749 notify_update(vc);
4750}
4751
4752void vc_scrolldelta_helper(struct vc_data *c, int lines,
4753 unsigned int rolled_over, void *base, unsigned int size)
4754{
4755 unsigned long ubase = (unsigned long)base;
4756 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4757 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4758 ptrdiff_t origin = (void *)c->vc_origin - base;
4759 int margin = c->vc_size_row * 4;
4760 int from, wrap, from_off, avail;
4761
4762 /* Turn scrollback off */
4763 if (!lines) {
4764 c->vc_visible_origin = c->vc_origin;
4765 return;
4766 }
4767
4768 /* Do we have already enough to allow jumping from 0 to the end? */
4769 if (rolled_over > scr_end + margin) {
4770 from = scr_end;
4771 wrap = rolled_over + c->vc_size_row;
4772 } else {
4773 from = 0;
4774 wrap = size;
4775 }
4776
4777 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4778 avail = (origin - from + wrap) % wrap;
4779
4780 /* Only a little piece would be left? Show all incl. the piece! */
4781 if (avail < 2 * margin)
4782 margin = 0;
4783 if (from_off < margin)
4784 from_off = 0;
4785 if (from_off > avail - margin)
4786 from_off = avail;
4787
4788 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4789}
4790EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
61 * deletion SMP-safe. 17Jun00, Andrew Morton
62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
76#include <linux/sched/signal.h>
77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/vmalloc.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
89#include <linux/mutex.h>
90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
97#include <linux/workqueue.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101#include <linux/notifier.h>
102#include <linux/device.h>
103#include <linux/io.h>
104#include <linux/uaccess.h>
105#include <linux/kdb.h>
106#include <linux/ctype.h>
107#include <linux/bsearch.h>
108#include <linux/gcd.h>
109
110#define MAX_NR_CON_DRIVER 16
111
112#define CON_DRIVER_FLAG_MODULE 1
113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
115#define CON_DRIVER_FLAG_ZOMBIE 8
116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
120 struct device *dev;
121 int node;
122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
128const struct consw *conswitchp;
129
130/*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133#define DEFAULT_BELL_PITCH 750
134#define DEFAULT_BELL_DURATION (HZ/8)
135#define DEFAULT_CURSOR_BLINK_MS 200
136
137struct vc vc_cons [MAX_NR_CONSOLES];
138EXPORT_SYMBOL(vc_cons);
139
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141
142static int con_open(struct tty_struct *, struct file *);
143static void vc_init(struct vc_data *vc, int do_clear);
144static void gotoxy(struct vc_data *vc, int new_x, int new_y);
145static void save_cur(struct vc_data *vc);
146static void reset_terminal(struct vc_data *vc, int do_clear);
147static void con_flush_chars(struct tty_struct *tty);
148static int set_vesa_blanking(u8 __user *mode);
149static void set_cursor(struct vc_data *vc);
150static void hide_cursor(struct vc_data *vc);
151static void console_callback(struct work_struct *ignored);
152static void con_driver_unregister_callback(struct work_struct *ignored);
153static void blank_screen_t(struct timer_list *unused);
154static void set_palette(struct vc_data *vc);
155static void unblank_screen(void);
156
157#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
159int default_utf8 = true;
160module_param(default_utf8, int, S_IRUGO | S_IWUSR);
161int global_cursor_default = -1;
162module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
163EXPORT_SYMBOL(global_cursor_default);
164
165static int cur_default = CUR_UNDERLINE;
166module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168/*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172static int ignore_poke;
173
174int do_poke_blanked_console;
175int console_blanked;
176EXPORT_SYMBOL(console_blanked);
177
178static enum vesa_blank_mode vesa_blank_mode;
179static int vesa_off_interval;
180static int blankinterval;
181core_param(consoleblank, blankinterval, int, 0444);
182
183static DECLARE_WORK(console_work, console_callback);
184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192int fg_console;
193EXPORT_SYMBOL(fg_console);
194int last_console;
195int want_console = -1;
196
197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
201static int saved_console_blanked;
202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
228EXPORT_SYMBOL(console_blank_hook);
229
230static DEFINE_TIMER(console_timer, blank_screen_t);
231static int blank_state;
232static int blank_timer_expired;
233enum {
234 blank_off = 0,
235 blank_normal_wait,
236 blank_vesa_wait,
237};
238
239/*
240 * /sys/class/tty/tty0/
241 *
242 * the attribute 'active' contains the name of the current vc
243 * console and it supports poll() to detect vc switches
244 */
245static struct device *tty0dev;
246
247/*
248 * Notifier list for console events.
249 */
250static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252int register_vt_notifier(struct notifier_block *nb)
253{
254 return atomic_notifier_chain_register(&vt_notifier_list, nb);
255}
256EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258int unregister_vt_notifier(struct notifier_block *nb)
259{
260 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
261}
262EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264static void notify_write(struct vc_data *vc, unsigned int unicode)
265{
266 struct vt_notifier_param param = { .vc = vc, .c = unicode };
267 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
268}
269
270static void notify_update(struct vc_data *vc)
271{
272 struct vt_notifier_param param = { .vc = vc };
273 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
274}
275/*
276 * Low-Level Functions
277 */
278
279static inline bool con_is_fg(const struct vc_data *vc)
280{
281 return vc->vc_num == fg_console;
282}
283
284static inline bool con_should_update(const struct vc_data *vc)
285{
286 return con_is_visible(vc) && !console_blanked;
287}
288
289static inline u16 *screenpos(const struct vc_data *vc, unsigned int offset,
290 bool viewed)
291{
292 unsigned long origin = viewed ? vc->vc_visible_origin : vc->vc_origin;
293
294 return (u16 *)(origin + offset);
295}
296
297static void con_putc(struct vc_data *vc, u16 ca, unsigned int y, unsigned int x)
298{
299 if (vc->vc_sw->con_putc)
300 vc->vc_sw->con_putc(vc, ca, y, x);
301 else
302 vc->vc_sw->con_putcs(vc, &ca, 1, y, x);
303}
304
305/* Called from the keyboard irq path.. */
306static inline void scrolldelta(int lines)
307{
308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
311 scrollback_delta += lines;
312 schedule_console_callback();
313}
314
315void schedule_console_callback(void)
316{
317 schedule_work(&console_work);
318}
319
320/*
321 * Code to manage unicode-based screen buffers
322 */
323
324/*
325 * Our screen buffer is preceded by an array of line pointers so that
326 * scrolling only implies some pointer shuffling.
327 */
328
329static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
330{
331 u32 **uni_lines;
332 void *p;
333 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
334
335 /* allocate everything in one go */
336 memsize = col_size * rows;
337 memsize += rows * sizeof(*uni_lines);
338 uni_lines = vzalloc(memsize);
339 if (!uni_lines)
340 return NULL;
341
342 /* initial line pointers */
343 p = uni_lines + rows;
344 for (i = 0; i < rows; i++) {
345 uni_lines[i] = p;
346 p += col_size;
347 }
348
349 return uni_lines;
350}
351
352static void vc_uniscr_free(u32 **uni_lines)
353{
354 vfree(uni_lines);
355}
356
357static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
358{
359 vc_uniscr_free(vc->vc_uni_lines);
360 vc->vc_uni_lines = new_uni_lines;
361}
362
363static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
364{
365 if (vc->vc_uni_lines)
366 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
367}
368
369static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
370{
371 if (vc->vc_uni_lines) {
372 u32 *ln = vc->vc_uni_lines[vc->state.y];
373 unsigned int x = vc->state.x, cols = vc->vc_cols;
374
375 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
376 memset32(&ln[x], ' ', nr);
377 }
378}
379
380static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
381{
382 if (vc->vc_uni_lines) {
383 u32 *ln = vc->vc_uni_lines[vc->state.y];
384 unsigned int x = vc->state.x, cols = vc->vc_cols;
385
386 memmove(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
387 memset32(&ln[cols - nr], ' ', nr);
388 }
389}
390
391static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
392 unsigned int nr)
393{
394 if (vc->vc_uni_lines)
395 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
396}
397
398static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
399 unsigned int nr)
400{
401 if (vc->vc_uni_lines)
402 while (nr--)
403 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
404}
405
406/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
407static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
408{
409 unsigned int gcd_idx;
410
411 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
412 u32 *gcd_idx_val = array[gcd_idx];
413 unsigned int dst_idx = gcd_idx;
414
415 while (1) {
416 unsigned int src_idx = (dst_idx + nr) % size;
417 if (src_idx == gcd_idx)
418 break;
419
420 array[dst_idx] = array[src_idx];
421 dst_idx = src_idx;
422 }
423
424 array[dst_idx] = gcd_idx_val;
425 }
426}
427
428static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
429 unsigned int bottom, enum con_scroll dir,
430 unsigned int nr)
431{
432 u32 **uni_lines = vc->vc_uni_lines;
433 unsigned int size = bottom - top;
434
435 if (!uni_lines)
436 return;
437
438 if (dir == SM_DOWN) {
439 juggle_array(&uni_lines[top], size, size - nr);
440 vc_uniscr_clear_lines(vc, top, nr);
441 } else {
442 juggle_array(&uni_lines[top], size, nr);
443 vc_uniscr_clear_lines(vc, bottom - nr, nr);
444 }
445}
446
447static void vc_uniscr_copy_area(u32 **dst_lines,
448 unsigned int dst_cols,
449 unsigned int dst_rows,
450 u32 **src_lines,
451 unsigned int src_cols,
452 unsigned int src_top_row,
453 unsigned int src_bot_row)
454{
455 unsigned int dst_row = 0;
456
457 if (!dst_lines)
458 return;
459
460 while (src_top_row < src_bot_row) {
461 u32 *src_line = src_lines[src_top_row];
462 u32 *dst_line = dst_lines[dst_row];
463
464 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
465 if (dst_cols - src_cols)
466 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
467 src_top_row++;
468 dst_row++;
469 }
470 while (dst_row < dst_rows) {
471 u32 *dst_line = dst_lines[dst_row];
472
473 memset32(dst_line, ' ', dst_cols);
474 dst_row++;
475 }
476}
477
478/*
479 * Called from vcs_read() to make sure unicode screen retrieval is possible.
480 * This will initialize the unicode screen buffer if not already done.
481 * This returns 0 if OK, or a negative error code otherwise.
482 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
483 */
484int vc_uniscr_check(struct vc_data *vc)
485{
486 u32 **uni_lines;
487 unsigned short *p;
488 int x, y, mask;
489
490 WARN_CONSOLE_UNLOCKED();
491
492 if (!vc->vc_utf)
493 return -ENODATA;
494
495 if (vc->vc_uni_lines)
496 return 0;
497
498 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
499 if (!uni_lines)
500 return -ENOMEM;
501
502 /*
503 * Let's populate it initially with (imperfect) reverse translation.
504 * This is the next best thing we can do short of having it enabled
505 * from the start even when no users rely on this functionality. True
506 * unicode content will be available after a complete screen refresh.
507 */
508 p = (unsigned short *)vc->vc_origin;
509 mask = vc->vc_hi_font_mask | 0xff;
510 for (y = 0; y < vc->vc_rows; y++) {
511 u32 *line = uni_lines[y];
512 for (x = 0; x < vc->vc_cols; x++) {
513 u16 glyph = scr_readw(p++) & mask;
514 line[x] = inverse_translate(vc, glyph, true);
515 }
516 }
517
518 vc->vc_uni_lines = uni_lines;
519
520 return 0;
521}
522
523/*
524 * Called from vcs_read() to get the unicode data from the screen.
525 * This must be preceded by a successful call to vc_uniscr_check() once
526 * the console lock has been taken.
527 */
528void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
529 unsigned int row, unsigned int col, unsigned int nr)
530{
531 u32 **uni_lines = vc->vc_uni_lines;
532 int offset = row * vc->vc_size_row + col * 2;
533 unsigned long pos;
534
535 if (WARN_ON_ONCE(!uni_lines))
536 return;
537
538 pos = (unsigned long)screenpos(vc, offset, viewed);
539 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
540 /*
541 * Desired position falls in the main screen buffer.
542 * However the actual row/col might be different if
543 * scrollback is active.
544 */
545 row = (pos - vc->vc_origin) / vc->vc_size_row;
546 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
547 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
548 } else {
549 /*
550 * Scrollback is active. For now let's simply backtranslate
551 * the screen glyphs until the unicode screen buffer does
552 * synchronize with console display drivers for a scrollback
553 * buffer of its own.
554 */
555 u16 *p = (u16 *)pos;
556 int mask = vc->vc_hi_font_mask | 0xff;
557 u32 *uni_buf = dest;
558 while (nr--) {
559 u16 glyph = scr_readw(p++) & mask;
560 *uni_buf++ = inverse_translate(vc, glyph, true);
561 }
562 }
563}
564
565static void con_scroll(struct vc_data *vc, unsigned int top,
566 unsigned int bottom, enum con_scroll dir,
567 unsigned int nr)
568{
569 unsigned int rows = bottom - top;
570 u16 *clear, *dst, *src;
571
572 if (top + nr >= bottom)
573 nr = rows - 1;
574 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
575 return;
576
577 vc_uniscr_scroll(vc, top, bottom, dir, nr);
578 if (con_is_visible(vc) &&
579 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
580 return;
581
582 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
583 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
584
585 if (dir == SM_UP) {
586 clear = src + (rows - nr) * vc->vc_cols;
587 swap(src, dst);
588 }
589 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
590 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
591}
592
593static void do_update_region(struct vc_data *vc, unsigned long start, int count)
594{
595 unsigned int xx, yy, offset;
596 u16 *p = (u16 *)start;
597
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
601
602 for(;;) {
603 u16 attrib = scr_readw(p) & 0xff00;
604 int startx = xx;
605 u16 *q = p;
606 while (xx < vc->vc_cols && count) {
607 if (attrib != (scr_readw(p) & 0xff00)) {
608 if (p > q)
609 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
610 startx = xx;
611 q = p;
612 attrib = scr_readw(p) & 0xff00;
613 }
614 p++;
615 xx++;
616 count--;
617 }
618 if (p > q)
619 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
620 if (!count)
621 break;
622 xx = 0;
623 yy++;
624 }
625}
626
627void update_region(struct vc_data *vc, unsigned long start, int count)
628{
629 WARN_CONSOLE_UNLOCKED();
630
631 if (con_should_update(vc)) {
632 hide_cursor(vc);
633 do_update_region(vc, start, count);
634 set_cursor(vc);
635 }
636}
637EXPORT_SYMBOL(update_region);
638
639/* Structure of attributes is hardware-dependent */
640
641static u8 build_attr(struct vc_data *vc, u8 _color,
642 enum vc_intensity _intensity, bool _blink, bool _underline,
643 bool _reverse, bool _italic)
644{
645 if (vc->vc_sw->con_build_attr)
646 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
647 _blink, _underline, _reverse, _italic);
648
649/*
650 * ++roman: I completely changed the attribute format for monochrome
651 * mode (!can_do_color). The formerly used MDA (monochrome display
652 * adapter) format didn't allow the combination of certain effects.
653 * Now the attribute is just a bit vector:
654 * Bit 0..1: intensity (0..2)
655 * Bit 2 : underline
656 * Bit 3 : reverse
657 * Bit 7 : blink
658 */
659 {
660 u8 a = _color;
661 if (!vc->vc_can_do_color)
662 return _intensity |
663 (_italic << 1) |
664 (_underline << 2) |
665 (_reverse << 3) |
666 (_blink << 7);
667 if (_italic)
668 a = (a & 0xF0) | vc->vc_itcolor;
669 else if (_underline)
670 a = (a & 0xf0) | vc->vc_ulcolor;
671 else if (_intensity == VCI_HALF_BRIGHT)
672 a = (a & 0xf0) | vc->vc_halfcolor;
673 if (_reverse)
674 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
675 if (_blink)
676 a ^= 0x80;
677 if (_intensity == VCI_BOLD)
678 a ^= 0x08;
679 if (vc->vc_hi_font_mask == 0x100)
680 a <<= 1;
681 return a;
682 }
683}
684
685static void update_attr(struct vc_data *vc)
686{
687 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
688 vc->state.blink, vc->state.underline,
689 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
690 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
691 VCI_NORMAL, vc->state.blink, false,
692 vc->vc_decscnm, false) << 8);
693}
694
695/* Note: inverting the screen twice should revert to the original state */
696void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
697{
698 u16 *p;
699
700 WARN_CONSOLE_UNLOCKED();
701
702 count /= 2;
703 p = screenpos(vc, offset, viewed);
704 if (vc->vc_sw->con_invert_region) {
705 vc->vc_sw->con_invert_region(vc, p, count);
706 } else {
707 u16 *q = p;
708 int cnt = count;
709 u16 a;
710
711 if (!vc->vc_can_do_color) {
712 while (cnt--) {
713 a = scr_readw(q);
714 a ^= 0x0800;
715 scr_writew(a, q);
716 q++;
717 }
718 } else if (vc->vc_hi_font_mask == 0x100) {
719 while (cnt--) {
720 a = scr_readw(q);
721 a = (a & 0x11ff) |
722 ((a & 0xe000) >> 4) |
723 ((a & 0x0e00) << 4);
724 scr_writew(a, q);
725 q++;
726 }
727 } else {
728 while (cnt--) {
729 a = scr_readw(q);
730 a = (a & 0x88ff) |
731 ((a & 0x7000) >> 4) |
732 ((a & 0x0700) << 4);
733 scr_writew(a, q);
734 q++;
735 }
736 }
737 }
738
739 if (con_should_update(vc))
740 do_update_region(vc, (unsigned long) p, count);
741 notify_update(vc);
742}
743
744/* used by selection: complement pointer position */
745void complement_pos(struct vc_data *vc, int offset)
746{
747 static int old_offset = -1;
748 static unsigned short old;
749 static unsigned short oldx, oldy;
750
751 WARN_CONSOLE_UNLOCKED();
752
753 if (old_offset != -1 && old_offset >= 0 &&
754 old_offset < vc->vc_screenbuf_size) {
755 scr_writew(old, screenpos(vc, old_offset, true));
756 if (con_should_update(vc))
757 con_putc(vc, old, oldy, oldx);
758 notify_update(vc);
759 }
760
761 old_offset = offset;
762
763 if (offset != -1 && offset >= 0 &&
764 offset < vc->vc_screenbuf_size) {
765 unsigned short new;
766 u16 *p = screenpos(vc, offset, true);
767 old = scr_readw(p);
768 new = old ^ vc->vc_complement_mask;
769 scr_writew(new, p);
770 if (con_should_update(vc)) {
771 oldx = (offset >> 1) % vc->vc_cols;
772 oldy = (offset >> 1) / vc->vc_cols;
773 con_putc(vc, new, oldy, oldx);
774 }
775 notify_update(vc);
776 }
777}
778
779static void insert_char(struct vc_data *vc, unsigned int nr)
780{
781 unsigned short *p = (unsigned short *) vc->vc_pos;
782
783 vc_uniscr_insert(vc, nr);
784 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
785 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
786 vc->vc_need_wrap = 0;
787 if (con_should_update(vc))
788 do_update_region(vc, (unsigned long) p,
789 vc->vc_cols - vc->state.x);
790}
791
792static void delete_char(struct vc_data *vc, unsigned int nr)
793{
794 unsigned short *p = (unsigned short *) vc->vc_pos;
795
796 vc_uniscr_delete(vc, nr);
797 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
798 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
799 nr * 2);
800 vc->vc_need_wrap = 0;
801 if (con_should_update(vc))
802 do_update_region(vc, (unsigned long) p,
803 vc->vc_cols - vc->state.x);
804}
805
806static int softcursor_original = -1;
807
808static void add_softcursor(struct vc_data *vc)
809{
810 int i = scr_readw((u16 *) vc->vc_pos);
811 u32 type = vc->vc_cursor_type;
812
813 if (!(type & CUR_SW))
814 return;
815 if (softcursor_original != -1)
816 return;
817 softcursor_original = i;
818 i |= CUR_SET(type);
819 i ^= CUR_CHANGE(type);
820 if ((type & CUR_ALWAYS_BG) &&
821 (softcursor_original & CUR_BG) == (i & CUR_BG))
822 i ^= CUR_BG;
823 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
824 i ^= CUR_FG;
825 scr_writew(i, (u16 *)vc->vc_pos);
826 if (con_should_update(vc))
827 con_putc(vc, i, vc->state.y, vc->state.x);
828}
829
830static void hide_softcursor(struct vc_data *vc)
831{
832 if (softcursor_original != -1) {
833 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
834 if (con_should_update(vc))
835 con_putc(vc, softcursor_original, vc->state.y,
836 vc->state.x);
837 softcursor_original = -1;
838 }
839}
840
841static void hide_cursor(struct vc_data *vc)
842{
843 if (vc_is_sel(vc))
844 clear_selection();
845
846 vc->vc_sw->con_cursor(vc, false);
847 hide_softcursor(vc);
848}
849
850static void set_cursor(struct vc_data *vc)
851{
852 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
853 return;
854 if (vc->vc_deccm) {
855 if (vc_is_sel(vc))
856 clear_selection();
857 add_softcursor(vc);
858 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
859 vc->vc_sw->con_cursor(vc, true);
860 } else
861 hide_cursor(vc);
862}
863
864static void set_origin(struct vc_data *vc)
865{
866 WARN_CONSOLE_UNLOCKED();
867
868 if (!con_is_visible(vc) ||
869 !vc->vc_sw->con_set_origin ||
870 !vc->vc_sw->con_set_origin(vc))
871 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
872 vc->vc_visible_origin = vc->vc_origin;
873 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
874 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
875 2 * vc->state.x;
876}
877
878static void save_screen(struct vc_data *vc)
879{
880 WARN_CONSOLE_UNLOCKED();
881
882 if (vc->vc_sw->con_save_screen)
883 vc->vc_sw->con_save_screen(vc);
884}
885
886static void flush_scrollback(struct vc_data *vc)
887{
888 WARN_CONSOLE_UNLOCKED();
889
890 set_origin(vc);
891 if (!con_is_visible(vc))
892 return;
893
894 /*
895 * The legacy way for flushing the scrollback buffer is to use a side
896 * effect of the con_switch method. We do it only on the foreground
897 * console as background consoles have no scrollback buffers in that
898 * case and we obviously don't want to switch to them.
899 */
900 hide_cursor(vc);
901 vc->vc_sw->con_switch(vc);
902 set_cursor(vc);
903}
904
905/*
906 * Redrawing of screen
907 */
908
909void clear_buffer_attributes(struct vc_data *vc)
910{
911 unsigned short *p = (unsigned short *)vc->vc_origin;
912 int count = vc->vc_screenbuf_size / 2;
913 int mask = vc->vc_hi_font_mask | 0xff;
914
915 for (; count > 0; count--, p++) {
916 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
917 }
918}
919
920void redraw_screen(struct vc_data *vc, int is_switch)
921{
922 int redraw = 0;
923
924 WARN_CONSOLE_UNLOCKED();
925
926 if (!vc) {
927 /* strange ... */
928 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
929 return;
930 }
931
932 if (is_switch) {
933 struct vc_data *old_vc = vc_cons[fg_console].d;
934 if (old_vc == vc)
935 return;
936 if (!con_is_visible(vc))
937 redraw = 1;
938 *vc->vc_display_fg = vc;
939 fg_console = vc->vc_num;
940 hide_cursor(old_vc);
941 if (!con_is_visible(old_vc)) {
942 save_screen(old_vc);
943 set_origin(old_vc);
944 }
945 if (tty0dev)
946 sysfs_notify(&tty0dev->kobj, NULL, "active");
947 } else {
948 hide_cursor(vc);
949 redraw = 1;
950 }
951
952 if (redraw) {
953 bool update;
954 int old_was_color = vc->vc_can_do_color;
955
956 set_origin(vc);
957 update = vc->vc_sw->con_switch(vc);
958 set_palette(vc);
959 /*
960 * If console changed from mono<->color, the best we can do
961 * is to clear the buffer attributes. As it currently stands,
962 * rebuilding new attributes from the old buffer is not doable
963 * without overly complex code.
964 */
965 if (old_was_color != vc->vc_can_do_color) {
966 update_attr(vc);
967 clear_buffer_attributes(vc);
968 }
969
970 if (update && vc->vc_mode != KD_GRAPHICS)
971 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
972 }
973 set_cursor(vc);
974 if (is_switch) {
975 vt_set_leds_compute_shiftstate();
976 notify_update(vc);
977 }
978}
979EXPORT_SYMBOL(redraw_screen);
980
981/*
982 * Allocation, freeing and resizing of VTs.
983 */
984
985int vc_cons_allocated(unsigned int i)
986{
987 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
988}
989
990static void visual_init(struct vc_data *vc, int num, bool init)
991{
992 /* ++Geert: vc->vc_sw->con_init determines console size */
993 if (vc->vc_sw)
994 module_put(vc->vc_sw->owner);
995 vc->vc_sw = conswitchp;
996
997 if (con_driver_map[num])
998 vc->vc_sw = con_driver_map[num];
999
1000 __module_get(vc->vc_sw->owner);
1001 vc->vc_num = num;
1002 vc->vc_display_fg = &master_display_fg;
1003 if (vc->uni_pagedict_loc)
1004 con_free_unimap(vc);
1005 vc->uni_pagedict_loc = &vc->uni_pagedict;
1006 vc->uni_pagedict = NULL;
1007 vc->vc_hi_font_mask = 0;
1008 vc->vc_complement_mask = 0;
1009 vc->vc_can_do_color = 0;
1010 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1011 vc->vc_sw->con_init(vc, init);
1012 if (!vc->vc_complement_mask)
1013 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1014 vc->vc_s_complement_mask = vc->vc_complement_mask;
1015 vc->vc_size_row = vc->vc_cols << 1;
1016 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1017}
1018
1019
1020static void visual_deinit(struct vc_data *vc)
1021{
1022 vc->vc_sw->con_deinit(vc);
1023 module_put(vc->vc_sw->owner);
1024}
1025
1026static void vc_port_destruct(struct tty_port *port)
1027{
1028 struct vc_data *vc = container_of(port, struct vc_data, port);
1029
1030 kfree(vc);
1031}
1032
1033static const struct tty_port_operations vc_port_ops = {
1034 .destruct = vc_port_destruct,
1035};
1036
1037/*
1038 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1039 * [this is to be used together with some user program
1040 * like resize that changes the hardware videomode]
1041 */
1042#define VC_MAXCOL (32767)
1043#define VC_MAXROW (32767)
1044
1045int vc_allocate(unsigned int currcons) /* return 0 on success */
1046{
1047 struct vt_notifier_param param;
1048 struct vc_data *vc;
1049 int err;
1050
1051 WARN_CONSOLE_UNLOCKED();
1052
1053 if (currcons >= MAX_NR_CONSOLES)
1054 return -ENXIO;
1055
1056 if (vc_cons[currcons].d)
1057 return 0;
1058
1059 /* due to the granularity of kmalloc, we waste some memory here */
1060 /* the alloc is done in two steps, to optimize the common situation
1061 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1062 /* although the numbers above are not valid since long ago, the
1063 point is still up-to-date and the comment still has its value
1064 even if only as a historical artifact. --mj, July 1998 */
1065 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1066 if (!vc)
1067 return -ENOMEM;
1068
1069 vc_cons[currcons].d = vc;
1070 tty_port_init(&vc->port);
1071 vc->port.ops = &vc_port_ops;
1072 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1073
1074 visual_init(vc, currcons, true);
1075
1076 if (!*vc->uni_pagedict_loc)
1077 con_set_default_unimap(vc);
1078
1079 err = -EINVAL;
1080 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1081 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1082 goto err_free;
1083 err = -ENOMEM;
1084 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1085 if (!vc->vc_screenbuf)
1086 goto err_free;
1087
1088 /* If no drivers have overridden us and the user didn't pass a
1089 boot option, default to displaying the cursor */
1090 if (global_cursor_default == -1)
1091 global_cursor_default = 1;
1092
1093 vc_init(vc, 1);
1094 vcs_make_sysfs(currcons);
1095 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1096
1097 return 0;
1098err_free:
1099 visual_deinit(vc);
1100 kfree(vc);
1101 vc_cons[currcons].d = NULL;
1102 return err;
1103}
1104
1105static inline int resize_screen(struct vc_data *vc, int width, int height,
1106 bool from_user)
1107{
1108 /* Resizes the resolution of the display adapater */
1109 int err = 0;
1110
1111 if (vc->vc_sw->con_resize)
1112 err = vc->vc_sw->con_resize(vc, width, height, from_user);
1113
1114 return err;
1115}
1116
1117/**
1118 * vc_do_resize - resizing method for the tty
1119 * @tty: tty being resized
1120 * @vc: virtual console private data
1121 * @cols: columns
1122 * @lines: lines
1123 * @from_user: invoked by a user?
1124 *
1125 * Resize a virtual console, clipping according to the actual constraints. If
1126 * the caller passes a tty structure then update the termios winsize
1127 * information and perform any necessary signal handling.
1128 *
1129 * Locking: Caller must hold the console semaphore. Takes the termios rwsem and
1130 * ctrl.lock of the tty IFF a tty is passed.
1131 */
1132static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1133 unsigned int cols, unsigned int lines, bool from_user)
1134{
1135 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1136 unsigned long end;
1137 unsigned int old_rows, old_row_size, first_copied_row;
1138 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1139 unsigned short *oldscreen, *newscreen;
1140 u32 **new_uniscr = NULL;
1141
1142 WARN_CONSOLE_UNLOCKED();
1143
1144 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1145 return -EINVAL;
1146
1147 new_cols = (cols ? cols : vc->vc_cols);
1148 new_rows = (lines ? lines : vc->vc_rows);
1149 new_row_size = new_cols << 1;
1150 new_screen_size = new_row_size * new_rows;
1151
1152 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1153 /*
1154 * This function is being called here to cover the case
1155 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1156 * passing the same fb_var_screeninfo containing the fields
1157 * yres/xres equal to a number non-multiple of vc_font.height
1158 * and yres_virtual/xres_virtual equal to number lesser than the
1159 * vc_font.height and yres/xres.
1160 * In the second call, the struct fb_var_screeninfo isn't
1161 * being modified by the underlying driver because of the
1162 * if above, and this causes the fbcon_display->vrows to become
1163 * negative and it eventually leads to out-of-bound
1164 * access by the imageblit function.
1165 * To give the correct values to the struct and to not have
1166 * to deal with possible errors from the code below, we call
1167 * the resize_screen here as well.
1168 */
1169 return resize_screen(vc, new_cols, new_rows, from_user);
1170 }
1171
1172 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1173 return -EINVAL;
1174 newscreen = kzalloc(new_screen_size, GFP_USER);
1175 if (!newscreen)
1176 return -ENOMEM;
1177
1178 if (vc->vc_uni_lines) {
1179 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1180 if (!new_uniscr) {
1181 kfree(newscreen);
1182 return -ENOMEM;
1183 }
1184 }
1185
1186 if (vc_is_sel(vc))
1187 clear_selection();
1188
1189 old_rows = vc->vc_rows;
1190 old_row_size = vc->vc_size_row;
1191
1192 err = resize_screen(vc, new_cols, new_rows, from_user);
1193 if (err) {
1194 kfree(newscreen);
1195 vc_uniscr_free(new_uniscr);
1196 return err;
1197 }
1198
1199 vc->vc_rows = new_rows;
1200 vc->vc_cols = new_cols;
1201 vc->vc_size_row = new_row_size;
1202 vc->vc_screenbuf_size = new_screen_size;
1203
1204 rlth = min(old_row_size, new_row_size);
1205 rrem = new_row_size - rlth;
1206 old_origin = vc->vc_origin;
1207 new_origin = (long) newscreen;
1208 new_scr_end = new_origin + new_screen_size;
1209
1210 if (vc->state.y > new_rows) {
1211 if (old_rows - vc->state.y < new_rows) {
1212 /*
1213 * Cursor near the bottom, copy contents from the
1214 * bottom of buffer
1215 */
1216 first_copied_row = (old_rows - new_rows);
1217 } else {
1218 /*
1219 * Cursor is in no man's land, copy 1/2 screenful
1220 * from the top and bottom of cursor position
1221 */
1222 first_copied_row = (vc->state.y - new_rows/2);
1223 }
1224 old_origin += first_copied_row * old_row_size;
1225 } else
1226 first_copied_row = 0;
1227 end = old_origin + old_row_size * min(old_rows, new_rows);
1228
1229 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1230 vc->vc_uni_lines, rlth/2, first_copied_row,
1231 min(old_rows, new_rows));
1232 vc_uniscr_set(vc, new_uniscr);
1233
1234 update_attr(vc);
1235
1236 while (old_origin < end) {
1237 scr_memcpyw((unsigned short *) new_origin,
1238 (unsigned short *) old_origin, rlth);
1239 if (rrem)
1240 scr_memsetw((void *)(new_origin + rlth),
1241 vc->vc_video_erase_char, rrem);
1242 old_origin += old_row_size;
1243 new_origin += new_row_size;
1244 }
1245 if (new_scr_end > new_origin)
1246 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1247 new_scr_end - new_origin);
1248 oldscreen = vc->vc_screenbuf;
1249 vc->vc_screenbuf = newscreen;
1250 vc->vc_screenbuf_size = new_screen_size;
1251 set_origin(vc);
1252 kfree(oldscreen);
1253
1254 /* do part of a reset_terminal() */
1255 vc->vc_top = 0;
1256 vc->vc_bottom = vc->vc_rows;
1257 gotoxy(vc, vc->state.x, vc->state.y);
1258 save_cur(vc);
1259
1260 if (tty) {
1261 /* Rewrite the requested winsize data with the actual
1262 resulting sizes */
1263 struct winsize ws;
1264 memset(&ws, 0, sizeof(ws));
1265 ws.ws_row = vc->vc_rows;
1266 ws.ws_col = vc->vc_cols;
1267 ws.ws_ypixel = vc->vc_scan_lines;
1268 tty_do_resize(tty, &ws);
1269 }
1270
1271 if (con_is_visible(vc))
1272 update_screen(vc);
1273 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1274 notify_update(vc);
1275 return err;
1276}
1277
1278/**
1279 * __vc_resize - resize a VT
1280 * @vc: virtual console
1281 * @cols: columns
1282 * @rows: rows
1283 * @from_user: invoked by a user?
1284 *
1285 * Resize a virtual console as seen from the console end of things. We use the
1286 * common vc_do_resize() method to update the structures.
1287 *
1288 * Locking: The caller must hold the console sem to protect console internals
1289 * and @vc->port.tty.
1290 */
1291int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows,
1292 bool from_user)
1293{
1294 return vc_do_resize(vc->port.tty, vc, cols, rows, from_user);
1295}
1296EXPORT_SYMBOL(__vc_resize);
1297
1298/**
1299 * vt_resize - resize a VT
1300 * @tty: tty to resize
1301 * @ws: winsize attributes
1302 *
1303 * Resize a virtual terminal. This is called by the tty layer as we register
1304 * our own handler for resizing. The mutual helper does all the actual work.
1305 *
1306 * Locking: Takes the console sem and the called methods then take the tty
1307 * termios_rwsem and the tty ctrl.lock in that order.
1308 */
1309static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1310{
1311 struct vc_data *vc = tty->driver_data;
1312 int ret;
1313
1314 console_lock();
1315 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
1316 console_unlock();
1317 return ret;
1318}
1319
1320struct vc_data *vc_deallocate(unsigned int currcons)
1321{
1322 struct vc_data *vc = NULL;
1323
1324 WARN_CONSOLE_UNLOCKED();
1325
1326 if (vc_cons_allocated(currcons)) {
1327 struct vt_notifier_param param;
1328
1329 param.vc = vc = vc_cons[currcons].d;
1330 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1331 vcs_remove_sysfs(currcons);
1332 visual_deinit(vc);
1333 con_free_unimap(vc);
1334 put_pid(vc->vt_pid);
1335 vc_uniscr_set(vc, NULL);
1336 kfree(vc->vc_screenbuf);
1337 vc_cons[currcons].d = NULL;
1338 }
1339 return vc;
1340}
1341
1342/*
1343 * VT102 emulator
1344 */
1345
1346enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1347
1348#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1349#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1350#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1351
1352#define decarm VC_REPEAT
1353#define decckm VC_CKMODE
1354#define kbdapplic VC_APPLIC
1355#define lnm VC_CRLF
1356
1357const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1358 8,12,10,14, 9,13,11,15 };
1359EXPORT_SYMBOL(color_table);
1360
1361/* the default colour table, for VGA+ colour systems */
1362unsigned char default_red[] = {
1363 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1364 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1365};
1366module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1367EXPORT_SYMBOL(default_red);
1368
1369unsigned char default_grn[] = {
1370 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1371 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1372};
1373module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1374EXPORT_SYMBOL(default_grn);
1375
1376unsigned char default_blu[] = {
1377 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1378 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1379};
1380module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1381EXPORT_SYMBOL(default_blu);
1382
1383/*
1384 * gotoxy() must verify all boundaries, because the arguments
1385 * might also be negative. If the given position is out of
1386 * bounds, the cursor is placed at the nearest margin.
1387 */
1388static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1389{
1390 int min_y, max_y;
1391
1392 if (new_x < 0)
1393 vc->state.x = 0;
1394 else {
1395 if (new_x >= vc->vc_cols)
1396 vc->state.x = vc->vc_cols - 1;
1397 else
1398 vc->state.x = new_x;
1399 }
1400
1401 if (vc->vc_decom) {
1402 min_y = vc->vc_top;
1403 max_y = vc->vc_bottom;
1404 } else {
1405 min_y = 0;
1406 max_y = vc->vc_rows;
1407 }
1408 if (new_y < min_y)
1409 vc->state.y = min_y;
1410 else if (new_y >= max_y)
1411 vc->state.y = max_y - 1;
1412 else
1413 vc->state.y = new_y;
1414 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1415 (vc->state.x << 1);
1416 vc->vc_need_wrap = 0;
1417}
1418
1419/* for absolute user moves, when decom is set */
1420static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1421{
1422 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1423}
1424
1425void scrollback(struct vc_data *vc)
1426{
1427 scrolldelta(-(vc->vc_rows / 2));
1428}
1429
1430void scrollfront(struct vc_data *vc, int lines)
1431{
1432 if (!lines)
1433 lines = vc->vc_rows / 2;
1434 scrolldelta(lines);
1435}
1436
1437static void lf(struct vc_data *vc)
1438{
1439 /* don't scroll if above bottom of scrolling region, or
1440 * if below scrolling region
1441 */
1442 if (vc->state.y + 1 == vc->vc_bottom)
1443 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1444 else if (vc->state.y < vc->vc_rows - 1) {
1445 vc->state.y++;
1446 vc->vc_pos += vc->vc_size_row;
1447 }
1448 vc->vc_need_wrap = 0;
1449 notify_write(vc, '\n');
1450}
1451
1452static void ri(struct vc_data *vc)
1453{
1454 /* don't scroll if below top of scrolling region, or
1455 * if above scrolling region
1456 */
1457 if (vc->state.y == vc->vc_top)
1458 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1459 else if (vc->state.y > 0) {
1460 vc->state.y--;
1461 vc->vc_pos -= vc->vc_size_row;
1462 }
1463 vc->vc_need_wrap = 0;
1464}
1465
1466static inline void cr(struct vc_data *vc)
1467{
1468 vc->vc_pos -= vc->state.x << 1;
1469 vc->vc_need_wrap = vc->state.x = 0;
1470 notify_write(vc, '\r');
1471}
1472
1473static inline void bs(struct vc_data *vc)
1474{
1475 if (vc->state.x) {
1476 vc->vc_pos -= 2;
1477 vc->state.x--;
1478 vc->vc_need_wrap = 0;
1479 notify_write(vc, '\b');
1480 }
1481}
1482
1483static inline void del(struct vc_data *vc)
1484{
1485 /* ignored */
1486}
1487
1488enum CSI_J {
1489 CSI_J_CURSOR_TO_END = 0,
1490 CSI_J_START_TO_CURSOR = 1,
1491 CSI_J_VISIBLE = 2,
1492 CSI_J_FULL = 3,
1493};
1494
1495static void csi_J(struct vc_data *vc, enum CSI_J vpar)
1496{
1497 unsigned short *start;
1498 unsigned int count;
1499
1500 switch (vpar) {
1501 case CSI_J_CURSOR_TO_END:
1502 vc_uniscr_clear_line(vc, vc->state.x,
1503 vc->vc_cols - vc->state.x);
1504 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1505 vc->vc_rows - vc->state.y - 1);
1506 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1507 start = (unsigned short *)vc->vc_pos;
1508 break;
1509 case CSI_J_START_TO_CURSOR:
1510 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1511 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1512 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1513 start = (unsigned short *)vc->vc_origin;
1514 break;
1515 case CSI_J_FULL:
1516 flush_scrollback(vc);
1517 fallthrough;
1518 case CSI_J_VISIBLE:
1519 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1520 count = vc->vc_cols * vc->vc_rows;
1521 start = (unsigned short *)vc->vc_origin;
1522 break;
1523 default:
1524 return;
1525 }
1526 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1527 if (con_should_update(vc))
1528 do_update_region(vc, (unsigned long) start, count);
1529 vc->vc_need_wrap = 0;
1530}
1531
1532enum {
1533 CSI_K_CURSOR_TO_LINEEND = 0,
1534 CSI_K_LINESTART_TO_CURSOR = 1,
1535 CSI_K_LINE = 2,
1536};
1537
1538static void csi_K(struct vc_data *vc)
1539{
1540 unsigned int count;
1541 unsigned short *start = (unsigned short *)vc->vc_pos;
1542 int offset;
1543
1544 switch (vc->vc_par[0]) {
1545 case CSI_K_CURSOR_TO_LINEEND:
1546 offset = 0;
1547 count = vc->vc_cols - vc->state.x;
1548 break;
1549 case CSI_K_LINESTART_TO_CURSOR:
1550 offset = -vc->state.x;
1551 count = vc->state.x + 1;
1552 break;
1553 case CSI_K_LINE:
1554 offset = -vc->state.x;
1555 count = vc->vc_cols;
1556 break;
1557 default:
1558 return;
1559 }
1560 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1561 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1562 vc->vc_need_wrap = 0;
1563 if (con_should_update(vc))
1564 do_update_region(vc, (unsigned long)(start + offset), count);
1565}
1566
1567/* erase the following count positions */
1568static void csi_X(struct vc_data *vc)
1569{ /* not vt100? */
1570 unsigned int count = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
1571
1572 vc_uniscr_clear_line(vc, vc->state.x, count);
1573 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1574 if (con_should_update(vc))
1575 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, count);
1576 vc->vc_need_wrap = 0;
1577}
1578
1579static void default_attr(struct vc_data *vc)
1580{
1581 vc->state.intensity = VCI_NORMAL;
1582 vc->state.italic = false;
1583 vc->state.underline = false;
1584 vc->state.reverse = false;
1585 vc->state.blink = false;
1586 vc->state.color = vc->vc_def_color;
1587}
1588
1589struct rgb { u8 r; u8 g; u8 b; };
1590
1591static void rgb_from_256(unsigned int i, struct rgb *c)
1592{
1593 if (i < 8) { /* Standard colours. */
1594 c->r = i&1 ? 0xaa : 0x00;
1595 c->g = i&2 ? 0xaa : 0x00;
1596 c->b = i&4 ? 0xaa : 0x00;
1597 } else if (i < 16) {
1598 c->r = i&1 ? 0xff : 0x55;
1599 c->g = i&2 ? 0xff : 0x55;
1600 c->b = i&4 ? 0xff : 0x55;
1601 } else if (i < 232) { /* 6x6x6 colour cube. */
1602 i -= 16;
1603 c->b = i % 6 * 255 / 6;
1604 i /= 6;
1605 c->g = i % 6 * 255 / 6;
1606 i /= 6;
1607 c->r = i * 255 / 6;
1608 } else /* Grayscale ramp. */
1609 c->r = c->g = c->b = i * 10 - 2312;
1610}
1611
1612static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1613{
1614 u8 hue = 0, max = max3(c->r, c->g, c->b);
1615
1616 if (c->r > max / 2)
1617 hue |= 4;
1618 if (c->g > max / 2)
1619 hue |= 2;
1620 if (c->b > max / 2)
1621 hue |= 1;
1622
1623 if (hue == 7 && max <= 0x55) {
1624 hue = 0;
1625 vc->state.intensity = VCI_BOLD;
1626 } else if (max > 0xaa)
1627 vc->state.intensity = VCI_BOLD;
1628 else
1629 vc->state.intensity = VCI_NORMAL;
1630
1631 vc->state.color = (vc->state.color & 0xf0) | hue;
1632}
1633
1634static void rgb_background(struct vc_data *vc, const struct rgb *c)
1635{
1636 /* For backgrounds, err on the dark side. */
1637 vc->state.color = (vc->state.color & 0x0f)
1638 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1639}
1640
1641/*
1642 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1643 * and thus need to be detected and ignored by hand. That standard also
1644 * wants : rather than ; as separators but sequences containing : are currently
1645 * completely ignored by the parser.
1646 *
1647 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1648 * supporting them.
1649 */
1650static int vc_t416_color(struct vc_data *vc, int i,
1651 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1652{
1653 struct rgb c;
1654
1655 i++;
1656 if (i > vc->vc_npar)
1657 return i;
1658
1659 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1660 /* 256 colours */
1661 i++;
1662 rgb_from_256(vc->vc_par[i], &c);
1663 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1664 /* 24 bit */
1665 c.r = vc->vc_par[i + 1];
1666 c.g = vc->vc_par[i + 2];
1667 c.b = vc->vc_par[i + 3];
1668 i += 3;
1669 } else
1670 return i;
1671
1672 set_color(vc, &c);
1673
1674 return i;
1675}
1676
1677enum {
1678 CSI_m_DEFAULT = 0,
1679 CSI_m_BOLD = 1,
1680 CSI_m_HALF_BRIGHT = 2,
1681 CSI_m_ITALIC = 3,
1682 CSI_m_UNDERLINE = 4,
1683 CSI_m_BLINK = 5,
1684 CSI_m_REVERSE = 7,
1685 CSI_m_PRI_FONT = 10,
1686 CSI_m_ALT_FONT1 = 11,
1687 CSI_m_ALT_FONT2 = 12,
1688 CSI_m_DOUBLE_UNDERLINE = 21,
1689 CSI_m_NORMAL_INTENSITY = 22,
1690 CSI_m_NO_ITALIC = 23,
1691 CSI_m_NO_UNDERLINE = 24,
1692 CSI_m_NO_BLINK = 25,
1693 CSI_m_NO_REVERSE = 27,
1694 CSI_m_FG_COLOR_BEG = 30,
1695 CSI_m_FG_COLOR_END = 37,
1696 CSI_m_FG_COLOR = 38,
1697 CSI_m_DEFAULT_FG_COLOR = 39,
1698 CSI_m_BG_COLOR_BEG = 40,
1699 CSI_m_BG_COLOR_END = 47,
1700 CSI_m_BG_COLOR = 48,
1701 CSI_m_DEFAULT_BG_COLOR = 49,
1702 CSI_m_BRIGHT_FG_COLOR_BEG = 90,
1703 CSI_m_BRIGHT_FG_COLOR_END = 97,
1704 CSI_m_BRIGHT_FG_COLOR_OFF = CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
1705 CSI_m_BRIGHT_BG_COLOR_BEG = 100,
1706 CSI_m_BRIGHT_BG_COLOR_END = 107,
1707 CSI_m_BRIGHT_BG_COLOR_OFF = CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
1708};
1709
1710/* console_lock is held */
1711static void csi_m(struct vc_data *vc)
1712{
1713 int i;
1714
1715 for (i = 0; i <= vc->vc_npar; i++)
1716 switch (vc->vc_par[i]) {
1717 case CSI_m_DEFAULT: /* all attributes off */
1718 default_attr(vc);
1719 break;
1720 case CSI_m_BOLD:
1721 vc->state.intensity = VCI_BOLD;
1722 break;
1723 case CSI_m_HALF_BRIGHT:
1724 vc->state.intensity = VCI_HALF_BRIGHT;
1725 break;
1726 case CSI_m_ITALIC:
1727 vc->state.italic = true;
1728 break;
1729 case CSI_m_DOUBLE_UNDERLINE:
1730 /*
1731 * No console drivers support double underline, so
1732 * convert it to a single underline.
1733 */
1734 case CSI_m_UNDERLINE:
1735 vc->state.underline = true;
1736 break;
1737 case CSI_m_BLINK:
1738 vc->state.blink = true;
1739 break;
1740 case CSI_m_REVERSE:
1741 vc->state.reverse = true;
1742 break;
1743 case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
1744 * Select primary font, don't display control chars if
1745 * defined, don't set bit 8 on output.
1746 */
1747 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1748 vc->vc_disp_ctrl = 0;
1749 vc->vc_toggle_meta = 0;
1750 break;
1751 case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
1752 * Select first alternate font, lets chars < 32 be
1753 * displayed as ROM chars.
1754 */
1755 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1756 vc->vc_disp_ctrl = 1;
1757 vc->vc_toggle_meta = 0;
1758 break;
1759 case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
1760 * Select second alternate font, toggle high bit
1761 * before displaying as ROM char.
1762 */
1763 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1764 vc->vc_disp_ctrl = 1;
1765 vc->vc_toggle_meta = 1;
1766 break;
1767 case CSI_m_NORMAL_INTENSITY:
1768 vc->state.intensity = VCI_NORMAL;
1769 break;
1770 case CSI_m_NO_ITALIC:
1771 vc->state.italic = false;
1772 break;
1773 case CSI_m_NO_UNDERLINE:
1774 vc->state.underline = false;
1775 break;
1776 case CSI_m_NO_BLINK:
1777 vc->state.blink = false;
1778 break;
1779 case CSI_m_NO_REVERSE:
1780 vc->state.reverse = false;
1781 break;
1782 case CSI_m_FG_COLOR:
1783 i = vc_t416_color(vc, i, rgb_foreground);
1784 break;
1785 case CSI_m_BG_COLOR:
1786 i = vc_t416_color(vc, i, rgb_background);
1787 break;
1788 case CSI_m_DEFAULT_FG_COLOR:
1789 vc->state.color = (vc->vc_def_color & 0x0f) |
1790 (vc->state.color & 0xf0);
1791 break;
1792 case CSI_m_DEFAULT_BG_COLOR:
1793 vc->state.color = (vc->vc_def_color & 0xf0) |
1794 (vc->state.color & 0x0f);
1795 break;
1796 case CSI_m_BRIGHT_FG_COLOR_BEG ... CSI_m_BRIGHT_FG_COLOR_END:
1797 vc->state.intensity = VCI_BOLD;
1798 vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
1799 fallthrough;
1800 case CSI_m_FG_COLOR_BEG ... CSI_m_FG_COLOR_END:
1801 vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
1802 vc->state.color = color_table[vc->vc_par[i]] |
1803 (vc->state.color & 0xf0);
1804 break;
1805 case CSI_m_BRIGHT_BG_COLOR_BEG ... CSI_m_BRIGHT_BG_COLOR_END:
1806 vc->vc_par[i] -= CSI_m_BRIGHT_BG_COLOR_OFF;
1807 fallthrough;
1808 case CSI_m_BG_COLOR_BEG ... CSI_m_BG_COLOR_END:
1809 vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
1810 vc->state.color = (color_table[vc->vc_par[i]] << 4) |
1811 (vc->state.color & 0x0f);
1812 break;
1813 }
1814 update_attr(vc);
1815}
1816
1817static void respond_string(const char *p, size_t len, struct tty_port *port)
1818{
1819 tty_insert_flip_string(port, p, len);
1820 tty_flip_buffer_push(port);
1821}
1822
1823static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1824{
1825 char buf[40];
1826 int len;
1827
1828 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1829 (vc->vc_decom ? vc->vc_top + 1 : 1),
1830 vc->state.x + 1);
1831 respond_string(buf, len, tty->port);
1832}
1833
1834static inline void status_report(struct tty_struct *tty)
1835{
1836 static const char teminal_ok[] = "\033[0n";
1837
1838 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1839}
1840
1841static inline void respond_ID(struct tty_struct *tty)
1842{
1843 /* terminal answer to an ESC-Z or csi0c query. */
1844 static const char vt102_id[] = "\033[?6c";
1845
1846 respond_string(vt102_id, strlen(vt102_id), tty->port);
1847}
1848
1849void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1850{
1851 char buf[8];
1852 int len;
1853
1854 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1855 (char)('!' + mrx), (char)('!' + mry));
1856 respond_string(buf, len, tty->port);
1857}
1858
1859/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1860int mouse_reporting(void)
1861{
1862 return vc_cons[fg_console].d->vc_report_mouse;
1863}
1864
1865enum {
1866 CSI_DEC_hl_CURSOR_KEYS = 1, /* CKM: cursor keys send ^[Ox/^[[x */
1867 CSI_DEC_hl_132_COLUMNS = 3, /* COLM: 80/132 mode switch */
1868 CSI_DEC_hl_REVERSE_VIDEO = 5, /* SCNM */
1869 CSI_DEC_hl_ORIGIN_MODE = 6, /* OM: origin relative/absolute */
1870 CSI_DEC_hl_AUTOWRAP = 7, /* AWM */
1871 CSI_DEC_hl_AUTOREPEAT = 8, /* ARM */
1872 CSI_DEC_hl_MOUSE_X10 = 9,
1873 CSI_DEC_hl_SHOW_CURSOR = 25, /* TCEM */
1874 CSI_DEC_hl_MOUSE_VT200 = 1000,
1875};
1876
1877/* console_lock is held */
1878static void csi_DEC_hl(struct vc_data *vc, bool on_off)
1879{
1880 unsigned int i;
1881
1882 for (i = 0; i <= vc->vc_npar; i++)
1883 switch (vc->vc_par[i]) {
1884 case CSI_DEC_hl_CURSOR_KEYS:
1885 if (on_off)
1886 set_kbd(vc, decckm);
1887 else
1888 clr_kbd(vc, decckm);
1889 break;
1890 case CSI_DEC_hl_132_COLUMNS: /* unimplemented */
1891#if 0
1892 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1893 /* this alone does not suffice; some user mode
1894 utility has to change the hardware regs */
1895#endif
1896 break;
1897 case CSI_DEC_hl_REVERSE_VIDEO:
1898 if (vc->vc_decscnm != on_off) {
1899 vc->vc_decscnm = on_off;
1900 invert_screen(vc, 0, vc->vc_screenbuf_size,
1901 false);
1902 update_attr(vc);
1903 }
1904 break;
1905 case CSI_DEC_hl_ORIGIN_MODE:
1906 vc->vc_decom = on_off;
1907 gotoxay(vc, 0, 0);
1908 break;
1909 case CSI_DEC_hl_AUTOWRAP:
1910 vc->vc_decawm = on_off;
1911 break;
1912 case CSI_DEC_hl_AUTOREPEAT:
1913 if (on_off)
1914 set_kbd(vc, decarm);
1915 else
1916 clr_kbd(vc, decarm);
1917 break;
1918 case CSI_DEC_hl_MOUSE_X10:
1919 vc->vc_report_mouse = on_off ? 1 : 0;
1920 break;
1921 case CSI_DEC_hl_SHOW_CURSOR:
1922 vc->vc_deccm = on_off;
1923 break;
1924 case CSI_DEC_hl_MOUSE_VT200:
1925 vc->vc_report_mouse = on_off ? 2 : 0;
1926 break;
1927 }
1928}
1929
1930enum {
1931 CSI_hl_DISPLAY_CTRL = 3, /* handle ansi control chars */
1932 CSI_hl_INSERT = 4, /* IRM: insert/replace */
1933 CSI_hl_AUTO_NL = 20, /* LNM: Enter == CrLf/Lf */
1934};
1935
1936/* console_lock is held */
1937static void csi_hl(struct vc_data *vc, bool on_off)
1938{
1939 unsigned int i;
1940
1941 for (i = 0; i <= vc->vc_npar; i++)
1942 switch (vc->vc_par[i]) { /* ANSI modes set/reset */
1943 case CSI_hl_DISPLAY_CTRL:
1944 vc->vc_disp_ctrl = on_off;
1945 break;
1946 case CSI_hl_INSERT:
1947 vc->vc_decim = on_off;
1948 break;
1949 case CSI_hl_AUTO_NL:
1950 if (on_off)
1951 set_kbd(vc, lnm);
1952 else
1953 clr_kbd(vc, lnm);
1954 break;
1955 }
1956}
1957
1958enum CSI_right_square_bracket {
1959 CSI_RSB_COLOR_FOR_UNDERLINE = 1,
1960 CSI_RSB_COLOR_FOR_HALF_BRIGHT = 2,
1961 CSI_RSB_MAKE_CUR_COLOR_DEFAULT = 8,
1962 CSI_RSB_BLANKING_INTERVAL = 9,
1963 CSI_RSB_BELL_FREQUENCY = 10,
1964 CSI_RSB_BELL_DURATION = 11,
1965 CSI_RSB_BRING_CONSOLE_TO_FRONT = 12,
1966 CSI_RSB_UNBLANK = 13,
1967 CSI_RSB_VESA_OFF_INTERVAL = 14,
1968 CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT = 15,
1969 CSI_RSB_CURSOR_BLINK_INTERVAL = 16,
1970};
1971
1972/*
1973 * csi_RSB - csi+] (Right Square Bracket) handler
1974 *
1975 * These are linux console private sequences.
1976 *
1977 * console_lock is held
1978 */
1979static void csi_RSB(struct vc_data *vc)
1980{
1981 switch (vc->vc_par[0]) {
1982 case CSI_RSB_COLOR_FOR_UNDERLINE:
1983 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1984 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1985 if (vc->state.underline)
1986 update_attr(vc);
1987 }
1988 break;
1989 case CSI_RSB_COLOR_FOR_HALF_BRIGHT:
1990 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1991 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1992 if (vc->state.intensity == VCI_HALF_BRIGHT)
1993 update_attr(vc);
1994 }
1995 break;
1996 case CSI_RSB_MAKE_CUR_COLOR_DEFAULT:
1997 vc->vc_def_color = vc->vc_attr;
1998 if (vc->vc_hi_font_mask == 0x100)
1999 vc->vc_def_color >>= 1;
2000 default_attr(vc);
2001 update_attr(vc);
2002 break;
2003 case CSI_RSB_BLANKING_INTERVAL:
2004 blankinterval = min(vc->vc_par[1], 60U) * 60;
2005 poke_blanked_console();
2006 break;
2007 case CSI_RSB_BELL_FREQUENCY:
2008 if (vc->vc_npar >= 1)
2009 vc->vc_bell_pitch = vc->vc_par[1];
2010 else
2011 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2012 break;
2013 case CSI_RSB_BELL_DURATION:
2014 if (vc->vc_npar >= 1)
2015 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
2016 msecs_to_jiffies(vc->vc_par[1]) : 0;
2017 else
2018 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2019 break;
2020 case CSI_RSB_BRING_CONSOLE_TO_FRONT:
2021 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
2022 set_console(vc->vc_par[1] - 1);
2023 break;
2024 case CSI_RSB_UNBLANK:
2025 poke_blanked_console();
2026 break;
2027 case CSI_RSB_VESA_OFF_INTERVAL:
2028 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2029 break;
2030 case CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT:
2031 set_console(last_console);
2032 break;
2033 case CSI_RSB_CURSOR_BLINK_INTERVAL:
2034 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2035 vc->vc_par[1] <= USHRT_MAX)
2036 vc->vc_cur_blink_ms = vc->vc_par[1];
2037 else
2038 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2039 break;
2040 }
2041}
2042
2043/* console_lock is held */
2044static void csi_at(struct vc_data *vc, unsigned int nr)
2045{
2046 nr = clamp(nr, 1, vc->vc_cols - vc->state.x);
2047 insert_char(vc, nr);
2048}
2049
2050/* console_lock is held */
2051static void csi_L(struct vc_data *vc)
2052{
2053 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2054
2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2056 vc->vc_need_wrap = 0;
2057}
2058
2059/* console_lock is held */
2060static void csi_P(struct vc_data *vc)
2061{
2062 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
2063
2064 delete_char(vc, nr);
2065}
2066
2067/* console_lock is held */
2068static void csi_M(struct vc_data *vc)
2069{
2070 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2071
2072 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2073 vc->vc_need_wrap = 0;
2074}
2075
2076/* console_lock is held (except via vc_init->reset_terminal */
2077static void save_cur(struct vc_data *vc)
2078{
2079 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2080}
2081
2082/* console_lock is held */
2083static void restore_cur(struct vc_data *vc)
2084{
2085 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2086
2087 gotoxy(vc, vc->state.x, vc->state.y);
2088 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2089 vc);
2090 update_attr(vc);
2091 vc->vc_need_wrap = 0;
2092}
2093
2094/**
2095 * enum vc_ctl_state - control characters state of a vt
2096 *
2097 * @ESnormal: initial state, no control characters parsed
2098 * @ESesc: ESC parsed
2099 * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
2100 * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
2101 * @ESfunckey: CSI [ parsed
2102 * @EShash: ESC # parsed
2103 * @ESsetG0: ESC ( parsed
2104 * @ESsetG1: ESC ) parsed
2105 * @ESpercent: ESC % parsed
2106 * @EScsiignore: CSI [0x20-0x3f] parsed
2107 * @ESnonstd: OSC parsed
2108 * @ESpalette: OSC P parsed
2109 * @ESosc: OSC [0-9] parsed
2110 * @ESANSI_first: first state for ignoring ansi control sequences
2111 * @ESapc: ESC _ parsed
2112 * @ESpm: ESC ^ parsed
2113 * @ESdcs: ESC P parsed
2114 * @ESANSI_last: last state for ignoring ansi control sequences
2115 */
2116enum vc_ctl_state {
2117 ESnormal,
2118 ESesc,
2119 ESsquare,
2120 ESgetpars,
2121 ESfunckey,
2122 EShash,
2123 ESsetG0,
2124 ESsetG1,
2125 ESpercent,
2126 EScsiignore,
2127 ESnonstd,
2128 ESpalette,
2129 ESosc,
2130 ESANSI_first = ESosc,
2131 ESapc,
2132 ESpm,
2133 ESdcs,
2134 ESANSI_last = ESdcs,
2135};
2136
2137/* console_lock is held (except via vc_init()) */
2138static void reset_terminal(struct vc_data *vc, int do_clear)
2139{
2140 unsigned int i;
2141
2142 vc->vc_top = 0;
2143 vc->vc_bottom = vc->vc_rows;
2144 vc->vc_state = ESnormal;
2145 vc->vc_priv = EPecma;
2146 vc->vc_translate = set_translate(LAT1_MAP, vc);
2147 vc->state.Gx_charset[0] = LAT1_MAP;
2148 vc->state.Gx_charset[1] = GRAF_MAP;
2149 vc->state.charset = 0;
2150 vc->vc_need_wrap = 0;
2151 vc->vc_report_mouse = 0;
2152 vc->vc_utf = default_utf8;
2153 vc->vc_utf_count = 0;
2154
2155 vc->vc_disp_ctrl = 0;
2156 vc->vc_toggle_meta = 0;
2157
2158 vc->vc_decscnm = 0;
2159 vc->vc_decom = 0;
2160 vc->vc_decawm = 1;
2161 vc->vc_deccm = global_cursor_default;
2162 vc->vc_decim = 0;
2163
2164 vt_reset_keyboard(vc->vc_num);
2165
2166 vc->vc_cursor_type = cur_default;
2167 vc->vc_complement_mask = vc->vc_s_complement_mask;
2168
2169 default_attr(vc);
2170 update_attr(vc);
2171
2172 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2173 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2174 set_bit(i, vc->vc_tab_stop);
2175
2176 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2177 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2178 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2179
2180 gotoxy(vc, 0, 0);
2181 save_cur(vc);
2182 if (do_clear)
2183 csi_J(vc, CSI_J_VISIBLE);
2184}
2185
2186static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
2187{
2188 unsigned char *charset = &vc->state.Gx_charset[which];
2189
2190 switch (c) {
2191 case '0':
2192 *charset = GRAF_MAP;
2193 break;
2194 case 'B':
2195 *charset = LAT1_MAP;
2196 break;
2197 case 'U':
2198 *charset = IBMPC_MAP;
2199 break;
2200 case 'K':
2201 *charset = USER_MAP;
2202 break;
2203 }
2204
2205 if (vc->state.charset == which)
2206 vc->vc_translate = set_translate(*charset, vc);
2207}
2208
2209static bool ansi_control_string(enum vc_ctl_state state)
2210{
2211 return state >= ESANSI_first && state <= ESANSI_last;
2212}
2213
2214enum {
2215 ASCII_NULL = 0,
2216 ASCII_BELL = 7,
2217 ASCII_BACKSPACE = 8,
2218 ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
2219 ASCII_HTAB = 9,
2220 ASCII_LINEFEED = 10,
2221 ASCII_VTAB = 11,
2222 ASCII_FORMFEED = 12,
2223 ASCII_CAR_RET = 13,
2224 ASCII_IGNORE_LAST = ASCII_CAR_RET,
2225 ASCII_SHIFTOUT = 14,
2226 ASCII_SHIFTIN = 15,
2227 ASCII_CANCEL = 24,
2228 ASCII_SUBSTITUTE = 26,
2229 ASCII_ESCAPE = 27,
2230 ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
2231 ASCII_CSI_IGNORE_LAST = '?',
2232 ASCII_DEL = 127,
2233 ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
2234};
2235
2236/*
2237 * Handle ascii characters in control sequences and change states accordingly.
2238 * E.g. ESC sets the state of vc to ESesc.
2239 *
2240 * Returns: true if @c handled.
2241 */
2242static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
2243{
2244 switch (c) {
2245 case ASCII_NULL:
2246 return true;
2247 case ASCII_BELL:
2248 if (ansi_control_string(vc->vc_state))
2249 vc->vc_state = ESnormal;
2250 else if (vc->vc_bell_duration)
2251 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2252 return true;
2253 case ASCII_BACKSPACE:
2254 bs(vc);
2255 return true;
2256 case ASCII_HTAB:
2257 vc->vc_pos -= (vc->state.x << 1);
2258
2259 vc->state.x = find_next_bit(vc->vc_tab_stop,
2260 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2261 vc->state.x + 1);
2262 if (vc->state.x >= VC_TABSTOPS_COUNT)
2263 vc->state.x = vc->vc_cols - 1;
2264
2265 vc->vc_pos += (vc->state.x << 1);
2266 notify_write(vc, '\t');
2267 return true;
2268 case ASCII_LINEFEED:
2269 case ASCII_VTAB:
2270 case ASCII_FORMFEED:
2271 lf(vc);
2272 if (!is_kbd(vc, lnm))
2273 return true;
2274 fallthrough;
2275 case ASCII_CAR_RET:
2276 cr(vc);
2277 return true;
2278 case ASCII_SHIFTOUT:
2279 vc->state.charset = 1;
2280 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2281 vc->vc_disp_ctrl = 1;
2282 return true;
2283 case ASCII_SHIFTIN:
2284 vc->state.charset = 0;
2285 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2286 vc->vc_disp_ctrl = 0;
2287 return true;
2288 case ASCII_CANCEL:
2289 case ASCII_SUBSTITUTE:
2290 vc->vc_state = ESnormal;
2291 return true;
2292 case ASCII_ESCAPE:
2293 vc->vc_state = ESesc;
2294 return true;
2295 case ASCII_DEL:
2296 del(vc);
2297 return true;
2298 case ASCII_EXT_CSI:
2299 vc->vc_state = ESsquare;
2300 return true;
2301 }
2302
2303 return false;
2304}
2305
2306/*
2307 * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
2308 * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
2309 * CSI).
2310 */
2311static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
2312{
2313 vc->vc_state = ESnormal;
2314 switch (c) {
2315 case '[':
2316 vc->vc_state = ESsquare;
2317 break;
2318 case ']':
2319 vc->vc_state = ESnonstd;
2320 break;
2321 case '_':
2322 vc->vc_state = ESapc;
2323 break;
2324 case '^':
2325 vc->vc_state = ESpm;
2326 break;
2327 case '%':
2328 vc->vc_state = ESpercent;
2329 break;
2330 case 'E':
2331 cr(vc);
2332 lf(vc);
2333 break;
2334 case 'M':
2335 ri(vc);
2336 break;
2337 case 'D':
2338 lf(vc);
2339 break;
2340 case 'H':
2341 if (vc->state.x < VC_TABSTOPS_COUNT)
2342 set_bit(vc->state.x, vc->vc_tab_stop);
2343 break;
2344 case 'P':
2345 vc->vc_state = ESdcs;
2346 break;
2347 case 'Z':
2348 respond_ID(tty);
2349 break;
2350 case '7':
2351 save_cur(vc);
2352 break;
2353 case '8':
2354 restore_cur(vc);
2355 break;
2356 case '(':
2357 vc->vc_state = ESsetG0;
2358 break;
2359 case ')':
2360 vc->vc_state = ESsetG1;
2361 break;
2362 case '#':
2363 vc->vc_state = EShash;
2364 break;
2365 case 'c':
2366 reset_terminal(vc, 1);
2367 break;
2368 case '>': /* Numeric keypad */
2369 clr_kbd(vc, kbdapplic);
2370 break;
2371 case '=': /* Appl. keypad */
2372 set_kbd(vc, kbdapplic);
2373 break;
2374 }
2375}
2376
2377/*
2378 * Handle special DEC control sequences ("ESC [ ? parameters char"). Parameters
2379 * are in @vc->vc_par and the char is in @c here.
2380 */
2381static void csi_DEC(struct tty_struct *tty, struct vc_data *vc, u8 c)
2382{
2383 switch (c) {
2384 case 'h':
2385 csi_DEC_hl(vc, true);
2386 break;
2387 case 'l':
2388 csi_DEC_hl(vc, false);
2389 break;
2390 case 'c':
2391 if (vc->vc_par[0])
2392 vc->vc_cursor_type = CUR_MAKE(vc->vc_par[0],
2393 vc->vc_par[1],
2394 vc->vc_par[2]);
2395 else
2396 vc->vc_cursor_type = cur_default;
2397 break;
2398 case 'm':
2399 clear_selection();
2400 if (vc->vc_par[0])
2401 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2402 else
2403 vc->vc_complement_mask = vc->vc_s_complement_mask;
2404 break;
2405 case 'n':
2406 if (vc->vc_par[0] == 5)
2407 status_report(tty);
2408 else if (vc->vc_par[0] == 6)
2409 cursor_report(vc, tty);
2410 break;
2411 }
2412}
2413
2414/*
2415 * Handle Control Sequence Introducer control characters. That is
2416 * "ESC [ parameters char". Parameters are in @vc->vc_par and the char is in
2417 * @c here.
2418 */
2419static void csi_ECMA(struct tty_struct *tty, struct vc_data *vc, u8 c)
2420{
2421 switch (c) {
2422 case 'G':
2423 case '`':
2424 if (vc->vc_par[0])
2425 vc->vc_par[0]--;
2426 gotoxy(vc, vc->vc_par[0], vc->state.y);
2427 break;
2428 case 'A':
2429 if (!vc->vc_par[0])
2430 vc->vc_par[0]++;
2431 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2432 break;
2433 case 'B':
2434 case 'e':
2435 if (!vc->vc_par[0])
2436 vc->vc_par[0]++;
2437 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2438 break;
2439 case 'C':
2440 case 'a':
2441 if (!vc->vc_par[0])
2442 vc->vc_par[0]++;
2443 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2444 break;
2445 case 'D':
2446 if (!vc->vc_par[0])
2447 vc->vc_par[0]++;
2448 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2449 break;
2450 case 'E':
2451 if (!vc->vc_par[0])
2452 vc->vc_par[0]++;
2453 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2454 break;
2455 case 'F':
2456 if (!vc->vc_par[0])
2457 vc->vc_par[0]++;
2458 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2459 break;
2460 case 'd':
2461 if (vc->vc_par[0])
2462 vc->vc_par[0]--;
2463 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2464 break;
2465 case 'H':
2466 case 'f':
2467 if (vc->vc_par[0])
2468 vc->vc_par[0]--;
2469 if (vc->vc_par[1])
2470 vc->vc_par[1]--;
2471 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2472 break;
2473 case 'J':
2474 csi_J(vc, vc->vc_par[0]);
2475 break;
2476 case 'K':
2477 csi_K(vc);
2478 break;
2479 case 'L':
2480 csi_L(vc);
2481 break;
2482 case 'M':
2483 csi_M(vc);
2484 break;
2485 case 'P':
2486 csi_P(vc);
2487 break;
2488 case 'c':
2489 if (!vc->vc_par[0])
2490 respond_ID(tty);
2491 break;
2492 case 'g':
2493 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2494 set_bit(vc->state.x, vc->vc_tab_stop);
2495 else if (vc->vc_par[0] == 3)
2496 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2497 break;
2498 case 'h':
2499 csi_hl(vc, true);
2500 break;
2501 case 'l':
2502 csi_hl(vc, false);
2503 break;
2504 case 'm':
2505 csi_m(vc);
2506 break;
2507 case 'n':
2508 if (vc->vc_par[0] == 5)
2509 status_report(tty);
2510 else if (vc->vc_par[0] == 6)
2511 cursor_report(vc, tty);
2512 break;
2513 case 'q': /* DECLL - but only 3 leds */
2514 /* map 0,1,2,3 to 0,1,2,4 */
2515 if (vc->vc_par[0] < 4)
2516 vt_set_led_state(vc->vc_num,
2517 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2518 break;
2519 case 'r':
2520 if (!vc->vc_par[0])
2521 vc->vc_par[0]++;
2522 if (!vc->vc_par[1])
2523 vc->vc_par[1] = vc->vc_rows;
2524 /* Minimum allowed region is 2 lines */
2525 if (vc->vc_par[0] < vc->vc_par[1] &&
2526 vc->vc_par[1] <= vc->vc_rows) {
2527 vc->vc_top = vc->vc_par[0] - 1;
2528 vc->vc_bottom = vc->vc_par[1];
2529 gotoxay(vc, 0, 0);
2530 }
2531 break;
2532 case 's':
2533 save_cur(vc);
2534 break;
2535 case 'u':
2536 restore_cur(vc);
2537 break;
2538 case 'X':
2539 csi_X(vc);
2540 break;
2541 case '@':
2542 csi_at(vc, vc->vc_par[0]);
2543 break;
2544 case ']':
2545 csi_RSB(vc);
2546 break;
2547 }
2548
2549}
2550
2551static void vc_reset_params(struct vc_data *vc)
2552{
2553 memset(vc->vc_par, 0, sizeof(vc->vc_par));
2554 vc->vc_npar = 0;
2555}
2556
2557/* console_lock is held */
2558static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
2559{
2560 /*
2561 * Control characters can be used in the _middle_
2562 * of an escape sequence, aside from ANSI control strings.
2563 */
2564 if (ansi_control_string(vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
2565 c <= ASCII_IGNORE_LAST)
2566 return;
2567
2568 if (handle_ascii(tty, vc, c))
2569 return;
2570
2571 switch(vc->vc_state) {
2572 case ESesc: /* ESC */
2573 handle_esc(tty, vc, c);
2574 return;
2575 case ESnonstd: /* ESC ] aka OSC */
2576 switch (c) {
2577 case 'P': /* palette escape sequence */
2578 vc_reset_params(vc);
2579 vc->vc_state = ESpalette;
2580 return;
2581 case 'R': /* reset palette */
2582 reset_palette(vc);
2583 break;
2584 case '0' ... '9':
2585 vc->vc_state = ESosc;
2586 return;
2587 }
2588 vc->vc_state = ESnormal;
2589 return;
2590 case ESpalette: /* ESC ] P aka OSC P */
2591 if (isxdigit(c)) {
2592 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2593 if (vc->vc_npar == 7) {
2594 int i = vc->vc_par[0] * 3, j = 1;
2595 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2596 vc->vc_palette[i++] += vc->vc_par[j++];
2597 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2598 vc->vc_palette[i++] += vc->vc_par[j++];
2599 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2600 vc->vc_palette[i] += vc->vc_par[j];
2601 set_palette(vc);
2602 vc->vc_state = ESnormal;
2603 }
2604 } else
2605 vc->vc_state = ESnormal;
2606 return;
2607 case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
2608 vc_reset_params(vc);
2609
2610 vc->vc_state = ESgetpars;
2611 switch (c) {
2612 case '[': /* Function key */
2613 vc->vc_state = ESfunckey;
2614 return;
2615 case '?':
2616 vc->vc_priv = EPdec;
2617 return;
2618 case '>':
2619 vc->vc_priv = EPgt;
2620 return;
2621 case '=':
2622 vc->vc_priv = EPeq;
2623 return;
2624 case '<':
2625 vc->vc_priv = EPlt;
2626 return;
2627 }
2628 vc->vc_priv = EPecma;
2629 fallthrough;
2630 case ESgetpars: /* ESC [ aka CSI, parameters expected */
2631 switch (c) {
2632 case ';':
2633 if (vc->vc_npar < NPAR - 1) {
2634 vc->vc_npar++;
2635 return;
2636 }
2637 break;
2638 case '0' ... '9':
2639 vc->vc_par[vc->vc_npar] *= 10;
2640 vc->vc_par[vc->vc_npar] += c - '0';
2641 return;
2642 }
2643 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
2644 vc->vc_state = EScsiignore;
2645 return;
2646 }
2647
2648 /* parameters done, handle the control char @c */
2649
2650 vc->vc_state = ESnormal;
2651
2652 switch (vc->vc_priv) {
2653 case EPdec:
2654 csi_DEC(tty, vc, c);
2655 return;
2656 case EPecma:
2657 csi_ECMA(tty, vc, c);
2658 return;
2659 default:
2660 return;
2661 }
2662 case EScsiignore:
2663 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
2664 return;
2665 vc->vc_state = ESnormal;
2666 return;
2667 case ESpercent: /* ESC % */
2668 vc->vc_state = ESnormal;
2669 switch (c) {
2670 case '@': /* defined in ISO 2022 */
2671 vc->vc_utf = 0;
2672 return;
2673 case 'G': /* prelim official escape code */
2674 case '8': /* retained for compatibility */
2675 vc->vc_utf = 1;
2676 return;
2677 }
2678 return;
2679 case ESfunckey: /* ESC [ [ aka CSI [ */
2680 vc->vc_state = ESnormal;
2681 return;
2682 case EShash: /* ESC # */
2683 vc->vc_state = ESnormal;
2684 if (c == '8') {
2685 /* DEC screen alignment test. kludge :-) */
2686 vc->vc_video_erase_char =
2687 (vc->vc_video_erase_char & 0xff00) | 'E';
2688 csi_J(vc, CSI_J_VISIBLE);
2689 vc->vc_video_erase_char =
2690 (vc->vc_video_erase_char & 0xff00) | ' ';
2691 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2692 }
2693 return;
2694 case ESsetG0: /* ESC ( */
2695 vc_setGx(vc, 0, c);
2696 vc->vc_state = ESnormal;
2697 return;
2698 case ESsetG1: /* ESC ) */
2699 vc_setGx(vc, 1, c);
2700 vc->vc_state = ESnormal;
2701 return;
2702 case ESapc: /* ESC _ */
2703 return;
2704 case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
2705 return;
2706 case ESpm: /* ESC ^ */
2707 return;
2708 case ESdcs: /* ESC P */
2709 return;
2710 default:
2711 vc->vc_state = ESnormal;
2712 }
2713}
2714
2715/* is_double_width() is based on the wcwidth() implementation by
2716 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2717 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2718 */
2719struct interval {
2720 uint32_t first;
2721 uint32_t last;
2722};
2723
2724static int ucs_cmp(const void *key, const void *elt)
2725{
2726 uint32_t ucs = *(uint32_t *)key;
2727 struct interval e = *(struct interval *) elt;
2728
2729 if (ucs > e.last)
2730 return 1;
2731 else if (ucs < e.first)
2732 return -1;
2733 return 0;
2734}
2735
2736static int is_double_width(uint32_t ucs)
2737{
2738 static const struct interval double_width[] = {
2739 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2740 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2741 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2742 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2743 };
2744 if (ucs < double_width[0].first ||
2745 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2746 return 0;
2747
2748 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2749 sizeof(struct interval), ucs_cmp) != NULL;
2750}
2751
2752struct vc_draw_region {
2753 unsigned long from, to;
2754 int x;
2755};
2756
2757static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2758{
2759 if (draw->x < 0)
2760 return;
2761
2762 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2763 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2764 draw->x);
2765 draw->x = -1;
2766}
2767
2768static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2769{
2770 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2771 if (vc->vc_toggle_meta)
2772 c |= 0x80;
2773
2774 return vc->vc_translate[c];
2775 }
2776
2777 return c;
2778}
2779
2780
2781/**
2782 * vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
2783 * @c: the received code point
2784 */
2785static inline int vc_sanitize_unicode(const int c)
2786{
2787 if (c >= 0xd800 && c <= 0xdfff)
2788 return 0xfffd;
2789
2790 return c;
2791}
2792
2793/**
2794 * vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
2795 * @vc: virtual console
2796 * @c: UTF-8 byte to translate
2797 * @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
2798 *
2799 * * &vc_data.vc_utf_char is the being-constructed Unicode code point.
2800 * * &vc_data.vc_utf_count is the number of continuation bytes still expected to
2801 * arrive.
2802 * * &vc_data.vc_npar is the number of continuation bytes arrived so far.
2803 *
2804 * Return:
2805 * * %-1 - Input OK so far, @c consumed, further bytes expected.
2806 * * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
2807 * desc. of @rescan). Possibility 2: input OK, @c consumed,
2808 * ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
2809 * ``REPLACEMENT CHARACTER``.
2810 * * otherwise - Input OK, @c consumed, resulting code point returned.
2811 */
2812static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2813{
2814 static const u32 utf8_length_changes[] = {0x7f, 0x7ff, 0xffff, 0x10ffff};
2815
2816 /* Continuation byte received */
2817 if ((c & 0xc0) == 0x80) {
2818 /* Unexpected continuation byte? */
2819 if (!vc->vc_utf_count)
2820 return 0xfffd;
2821
2822 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2823 vc->vc_npar++;
2824 if (--vc->vc_utf_count)
2825 goto need_more_bytes;
2826
2827 /* Got a whole character */
2828 c = vc->vc_utf_char;
2829 /* Reject overlong sequences */
2830 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2831 c > utf8_length_changes[vc->vc_npar])
2832 return 0xfffd;
2833
2834 return vc_sanitize_unicode(c);
2835 }
2836
2837 /* Single ASCII byte or first byte of a sequence received */
2838 if (vc->vc_utf_count) {
2839 /* Continuation byte expected */
2840 *rescan = true;
2841 vc->vc_utf_count = 0;
2842 return 0xfffd;
2843 }
2844
2845 /* Nothing to do if an ASCII byte was received */
2846 if (c <= 0x7f)
2847 return c;
2848
2849 /* First byte of a multibyte sequence received */
2850 vc->vc_npar = 0;
2851 if ((c & 0xe0) == 0xc0) {
2852 vc->vc_utf_count = 1;
2853 vc->vc_utf_char = (c & 0x1f);
2854 } else if ((c & 0xf0) == 0xe0) {
2855 vc->vc_utf_count = 2;
2856 vc->vc_utf_char = (c & 0x0f);
2857 } else if ((c & 0xf8) == 0xf0) {
2858 vc->vc_utf_count = 3;
2859 vc->vc_utf_char = (c & 0x07);
2860 } else {
2861 return 0xfffd;
2862 }
2863
2864need_more_bytes:
2865 return -1;
2866}
2867
2868static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2869{
2870 /* Do no translation at all in control states */
2871 if (vc->vc_state != ESnormal)
2872 return *c;
2873
2874 if (vc->vc_utf && !vc->vc_disp_ctrl)
2875 return *c = vc_translate_unicode(vc, *c, rescan);
2876
2877 /* no utf or alternate charset mode */
2878 return vc_translate_ascii(vc, *c);
2879}
2880
2881static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2882{
2883 if (!vc->vc_can_do_color)
2884 return vc->vc_attr ^ 0x08;
2885
2886 if (vc->vc_hi_font_mask == 0x100)
2887 return (vc->vc_attr & 0x11) |
2888 ((vc->vc_attr & 0xe0) >> 4) |
2889 ((vc->vc_attr & 0x0e) << 4);
2890
2891 return (vc->vc_attr & 0x88) |
2892 ((vc->vc_attr & 0x70) >> 4) |
2893 ((vc->vc_attr & 0x07) << 4);
2894}
2895
2896static bool vc_is_control(struct vc_data *vc, int tc, int c)
2897{
2898 /*
2899 * A bitmap for codes <32. A bit of 1 indicates that the code
2900 * corresponding to that bit number invokes some special action (such
2901 * as cursor movement) and should not be displayed as a glyph unless
2902 * the disp_ctrl mode is explicitly enabled.
2903 */
2904 static const u32 CTRL_ACTION = BIT(ASCII_NULL) |
2905 GENMASK(ASCII_SHIFTIN, ASCII_BELL) | BIT(ASCII_CANCEL) |
2906 BIT(ASCII_SUBSTITUTE) | BIT(ASCII_ESCAPE);
2907 /* Cannot be overridden by disp_ctrl */
2908 static const u32 CTRL_ALWAYS = BIT(ASCII_NULL) | BIT(ASCII_BACKSPACE) |
2909 BIT(ASCII_LINEFEED) | BIT(ASCII_SHIFTIN) | BIT(ASCII_SHIFTOUT) |
2910 BIT(ASCII_CAR_RET) | BIT(ASCII_FORMFEED) | BIT(ASCII_ESCAPE);
2911
2912 if (vc->vc_state != ESnormal)
2913 return true;
2914
2915 if (!tc)
2916 return true;
2917
2918 /*
2919 * If the original code was a control character we only allow a glyph
2920 * to be displayed if the code is not normally used (such as for cursor
2921 * movement) or if the disp_ctrl mode has been explicitly enabled.
2922 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2923 * displayed as control characters, as the console would be pretty
2924 * useless without them; to display an arbitrary font position use the
2925 * direct-to-font zone in UTF-8 mode.
2926 */
2927 if (c < BITS_PER_TYPE(CTRL_ALWAYS)) {
2928 if (vc->vc_disp_ctrl)
2929 return CTRL_ALWAYS & BIT(c);
2930 else
2931 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2932 }
2933
2934 if (c == ASCII_DEL && !vc->vc_disp_ctrl)
2935 return true;
2936
2937 if (c == ASCII_EXT_CSI)
2938 return true;
2939
2940 return false;
2941}
2942
2943static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2944 struct vc_draw_region *draw)
2945{
2946 int next_c;
2947 unsigned char vc_attr = vc->vc_attr;
2948 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2949 u8 width = 1;
2950 bool inverse = false;
2951
2952 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2953 if (is_double_width(c))
2954 width = 2;
2955 }
2956
2957 /* Now try to find out how to display it */
2958 tc = conv_uni_to_pc(vc, tc);
2959 if (tc & ~charmask) {
2960 if (tc == -1 || tc == -2)
2961 return -1; /* nothing to display */
2962
2963 /* Glyph not found */
2964 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2965 !(c & ~charmask)) {
2966 /*
2967 * In legacy mode use the glyph we get by a 1:1
2968 * mapping.
2969 * This would make absolutely no sense with Unicode in
2970 * mind, but do this for ASCII characters since a font
2971 * may lack Unicode mapping info and we don't want to
2972 * end up with having question marks only.
2973 */
2974 tc = c;
2975 } else {
2976 /*
2977 * Display U+FFFD. If it's not found, display an inverse
2978 * question mark.
2979 */
2980 tc = conv_uni_to_pc(vc, 0xfffd);
2981 if (tc < 0) {
2982 inverse = true;
2983 tc = conv_uni_to_pc(vc, '?');
2984 if (tc < 0)
2985 tc = '?';
2986
2987 vc_attr = vc_invert_attr(vc);
2988 con_flush(vc, draw);
2989 }
2990 }
2991 }
2992
2993 next_c = c;
2994 while (1) {
2995 if (vc->vc_need_wrap || vc->vc_decim)
2996 con_flush(vc, draw);
2997 if (vc->vc_need_wrap) {
2998 cr(vc);
2999 lf(vc);
3000 }
3001 if (vc->vc_decim)
3002 insert_char(vc, 1);
3003 vc_uniscr_putc(vc, next_c);
3004
3005 if (himask)
3006 tc = ((tc & 0x100) ? himask : 0) |
3007 (tc & 0xff);
3008 tc |= (vc_attr << 8) & ~himask;
3009
3010 scr_writew(tc, (u16 *)vc->vc_pos);
3011
3012 if (con_should_update(vc) && draw->x < 0) {
3013 draw->x = vc->state.x;
3014 draw->from = vc->vc_pos;
3015 }
3016 if (vc->state.x == vc->vc_cols - 1) {
3017 vc->vc_need_wrap = vc->vc_decawm;
3018 draw->to = vc->vc_pos + 2;
3019 } else {
3020 vc->state.x++;
3021 draw->to = (vc->vc_pos += 2);
3022 }
3023
3024 if (!--width)
3025 break;
3026
3027 /* A space is printed in the second column */
3028 tc = conv_uni_to_pc(vc, ' ');
3029 if (tc < 0)
3030 tc = ' ';
3031 next_c = ' ';
3032 }
3033 notify_write(vc, c);
3034
3035 if (inverse)
3036 con_flush(vc, draw);
3037
3038 return 0;
3039}
3040
3041/* acquires console_lock */
3042static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
3043{
3044 struct vc_draw_region draw = {
3045 .x = -1,
3046 };
3047 int c, tc, n = 0;
3048 unsigned int currcons;
3049 struct vc_data *vc = tty->driver_data;
3050 struct vt_notifier_param param;
3051 bool rescan;
3052
3053 if (in_interrupt())
3054 return count;
3055
3056 console_lock();
3057 currcons = vc->vc_num;
3058 if (!vc_cons_allocated(currcons)) {
3059 /* could this happen? */
3060 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
3061 console_unlock();
3062 return 0;
3063 }
3064
3065
3066 /* undraw cursor first */
3067 if (con_is_fg(vc))
3068 hide_cursor(vc);
3069
3070 param.vc = vc;
3071
3072 while (!tty->flow.stopped && count) {
3073 u8 orig = *buf;
3074 buf++;
3075 n++;
3076 count--;
3077rescan_last_byte:
3078 c = orig;
3079 rescan = false;
3080
3081 tc = vc_translate(vc, &c, &rescan);
3082 if (tc == -1)
3083 continue;
3084
3085 param.c = tc;
3086 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
3087 ¶m) == NOTIFY_STOP)
3088 continue;
3089
3090 if (vc_is_control(vc, tc, c)) {
3091 con_flush(vc, &draw);
3092 do_con_trol(tty, vc, orig);
3093 continue;
3094 }
3095
3096 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
3097 continue;
3098
3099 if (rescan)
3100 goto rescan_last_byte;
3101 }
3102 con_flush(vc, &draw);
3103 console_conditional_schedule();
3104 notify_update(vc);
3105 console_unlock();
3106 return n;
3107}
3108
3109/*
3110 * This is the console switching callback.
3111 *
3112 * Doing console switching in a process context allows
3113 * us to do the switches asynchronously (needed when we want
3114 * to switch due to a keyboard interrupt). Synchronization
3115 * with other console code and prevention of re-entrancy is
3116 * ensured with console_lock.
3117 */
3118static void console_callback(struct work_struct *ignored)
3119{
3120 console_lock();
3121
3122 if (want_console >= 0) {
3123 if (want_console != fg_console &&
3124 vc_cons_allocated(want_console)) {
3125 hide_cursor(vc_cons[fg_console].d);
3126 change_console(vc_cons[want_console].d);
3127 /* we only changed when the console had already
3128 been allocated - a new console is not created
3129 in an interrupt routine */
3130 }
3131 want_console = -1;
3132 }
3133 if (do_poke_blanked_console) { /* do not unblank for a LED change */
3134 do_poke_blanked_console = 0;
3135 poke_blanked_console();
3136 }
3137 if (scrollback_delta) {
3138 struct vc_data *vc = vc_cons[fg_console].d;
3139 clear_selection();
3140 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3141 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3142 scrollback_delta = 0;
3143 }
3144 if (blank_timer_expired) {
3145 do_blank_screen(0);
3146 blank_timer_expired = 0;
3147 }
3148 notify_update(vc_cons[fg_console].d);
3149
3150 console_unlock();
3151}
3152
3153int set_console(int nr)
3154{
3155 struct vc_data *vc = vc_cons[fg_console].d;
3156
3157 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3158 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3159
3160 /*
3161 * Console switch will fail in console_callback() or
3162 * change_console() so there is no point scheduling
3163 * the callback
3164 *
3165 * Existing set_console() users don't check the return
3166 * value so this shouldn't break anything
3167 */
3168 return -EINVAL;
3169 }
3170
3171 want_console = nr;
3172 schedule_console_callback();
3173
3174 return 0;
3175}
3176
3177struct tty_driver *console_driver;
3178
3179#ifdef CONFIG_VT_CONSOLE
3180
3181/**
3182 * vt_kmsg_redirect() - sets/gets the kernel message console
3183 * @new: the new virtual terminal number or -1 if the console should stay
3184 * unchanged
3185 *
3186 * By default, the kernel messages are always printed on the current virtual
3187 * console. However, the user may modify that default with the
3188 * %TIOCL_SETKMSGREDIRECT ioctl call.
3189 *
3190 * This function sets the kernel message console to be @new. It returns the old
3191 * virtual console number. The virtual terminal number %0 (both as parameter and
3192 * return value) means no redirection (i.e. always printed on the currently
3193 * active console).
3194 *
3195 * The parameter -1 means that only the current console is returned, but the
3196 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3197 * case to make the code more understandable.
3198 *
3199 * When the kernel is compiled without %CONFIG_VT_CONSOLE, this function ignores
3200 * the parameter and always returns %0.
3201 */
3202int vt_kmsg_redirect(int new)
3203{
3204 static int kmsg_con;
3205
3206 if (new != -1)
3207 return xchg(&kmsg_con, new);
3208 else
3209 return kmsg_con;
3210}
3211
3212/*
3213 * Console on virtual terminal
3214 *
3215 * The console must be locked when we get here.
3216 */
3217
3218static void vt_console_print(struct console *co, const char *b, unsigned count)
3219{
3220 struct vc_data *vc = vc_cons[fg_console].d;
3221 unsigned char c;
3222 static DEFINE_SPINLOCK(printing_lock);
3223 const ushort *start;
3224 ushort start_x, cnt;
3225 int kmsg_console;
3226
3227 WARN_CONSOLE_UNLOCKED();
3228
3229 /* this protects against concurrent oops only */
3230 if (!spin_trylock(&printing_lock))
3231 return;
3232
3233 kmsg_console = vt_get_kmsg_redirect();
3234 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3235 vc = vc_cons[kmsg_console - 1].d;
3236
3237 if (!vc_cons_allocated(fg_console)) {
3238 /* impossible */
3239 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3240 goto quit;
3241 }
3242
3243 if (vc->vc_mode != KD_TEXT)
3244 goto quit;
3245
3246 /* undraw cursor first */
3247 if (con_is_fg(vc))
3248 hide_cursor(vc);
3249
3250 start = (ushort *)vc->vc_pos;
3251 start_x = vc->state.x;
3252 cnt = 0;
3253 while (count--) {
3254 c = *b++;
3255 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET ||
3256 c == ASCII_BACKSPACE || vc->vc_need_wrap) {
3257 if (cnt && con_is_visible(vc))
3258 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3259 cnt = 0;
3260 if (c == ASCII_BACKSPACE) {
3261 bs(vc);
3262 start = (ushort *)vc->vc_pos;
3263 start_x = vc->state.x;
3264 continue;
3265 }
3266 if (c != ASCII_CAR_RET)
3267 lf(vc);
3268 cr(vc);
3269 start = (ushort *)vc->vc_pos;
3270 start_x = vc->state.x;
3271 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET)
3272 continue;
3273 }
3274 vc_uniscr_putc(vc, c);
3275 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3276 notify_write(vc, c);
3277 cnt++;
3278 if (vc->state.x == vc->vc_cols - 1) {
3279 vc->vc_need_wrap = 1;
3280 } else {
3281 vc->vc_pos += 2;
3282 vc->state.x++;
3283 }
3284 }
3285 if (cnt && con_is_visible(vc))
3286 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3287 set_cursor(vc);
3288 notify_update(vc);
3289
3290quit:
3291 spin_unlock(&printing_lock);
3292}
3293
3294static struct tty_driver *vt_console_device(struct console *c, int *index)
3295{
3296 *index = c->index ? c->index-1 : fg_console;
3297 return console_driver;
3298}
3299
3300static int vt_console_setup(struct console *co, char *options)
3301{
3302 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3303}
3304
3305static struct console vt_console_driver = {
3306 .name = "tty",
3307 .setup = vt_console_setup,
3308 .write = vt_console_print,
3309 .device = vt_console_device,
3310 .unblank = unblank_screen,
3311 .flags = CON_PRINTBUFFER,
3312 .index = -1,
3313};
3314#endif
3315
3316/*
3317 * Handling of Linux-specific VC ioctls
3318 */
3319
3320/*
3321 * Generally a bit racy with respect to console_lock();.
3322 *
3323 * There are some functions which don't need it.
3324 *
3325 * There are some functions which can sleep for arbitrary periods
3326 * (paste_selection) but we don't need the lock there anyway.
3327 *
3328 * set_selection_user has locking, and definitely needs it
3329 */
3330
3331int tioclinux(struct tty_struct *tty, unsigned long arg)
3332{
3333 char type, data;
3334 char __user *p = (char __user *)arg;
3335 void __user *param_aligned32 = (u32 __user *)arg + 1;
3336 void __user *param = (void __user *)arg + 1;
3337 int lines;
3338 int ret;
3339
3340 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3341 return -EPERM;
3342 if (get_user(type, p))
3343 return -EFAULT;
3344 ret = 0;
3345
3346 switch (type) {
3347 case TIOCL_SETSEL:
3348 return set_selection_user(param, tty);
3349 case TIOCL_PASTESEL:
3350 if (!capable(CAP_SYS_ADMIN))
3351 return -EPERM;
3352 return paste_selection(tty);
3353 case TIOCL_UNBLANKSCREEN:
3354 console_lock();
3355 unblank_screen();
3356 console_unlock();
3357 break;
3358 case TIOCL_SELLOADLUT:
3359 if (!capable(CAP_SYS_ADMIN))
3360 return -EPERM;
3361 return sel_loadlut(param_aligned32);
3362 case TIOCL_GETSHIFTSTATE:
3363 /*
3364 * Make it possible to react to Shift+Mousebutton. Note that
3365 * 'shift_state' is an undocumented kernel-internal variable;
3366 * programs not closely related to the kernel should not use
3367 * this.
3368 */
3369 data = vt_get_shift_state();
3370 return put_user(data, p);
3371 case TIOCL_GETMOUSEREPORTING:
3372 console_lock(); /* May be overkill */
3373 data = mouse_reporting();
3374 console_unlock();
3375 return put_user(data, p);
3376 case TIOCL_SETVESABLANK:
3377 return set_vesa_blanking(param);
3378 case TIOCL_GETKMSGREDIRECT:
3379 data = vt_get_kmsg_redirect();
3380 return put_user(data, p);
3381 case TIOCL_SETKMSGREDIRECT:
3382 if (!capable(CAP_SYS_ADMIN))
3383 return -EPERM;
3384
3385 if (get_user(data, p+1))
3386 return -EFAULT;
3387
3388 vt_kmsg_redirect(data);
3389
3390 break;
3391 case TIOCL_GETFGCONSOLE:
3392 /*
3393 * No locking needed as this is a transiently correct return
3394 * anyway if the caller hasn't disabled switching.
3395 */
3396 return fg_console;
3397 case TIOCL_SCROLLCONSOLE:
3398 if (get_user(lines, (s32 __user *)param_aligned32))
3399 return -EFAULT;
3400
3401 /*
3402 * Needs the console lock here. Note that lots of other calls
3403 * need fixing before the lock is actually useful!
3404 */
3405 console_lock();
3406 scrollfront(vc_cons[fg_console].d, lines);
3407 console_unlock();
3408 break;
3409 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3410 console_lock();
3411 ignore_poke = 1;
3412 do_blank_screen(0);
3413 console_unlock();
3414 break;
3415 case TIOCL_BLANKEDSCREEN:
3416 return console_blanked;
3417 default:
3418 return -EINVAL;
3419 }
3420
3421 return ret;
3422}
3423
3424/*
3425 * /dev/ttyN handling
3426 */
3427
3428static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
3429{
3430 int retval;
3431
3432 retval = do_con_write(tty, buf, count);
3433 con_flush_chars(tty);
3434
3435 return retval;
3436}
3437
3438static int con_put_char(struct tty_struct *tty, u8 ch)
3439{
3440 return do_con_write(tty, &ch, 1);
3441}
3442
3443static unsigned int con_write_room(struct tty_struct *tty)
3444{
3445 if (tty->flow.stopped)
3446 return 0;
3447 return 32768; /* No limit, really; we're not buffering */
3448}
3449
3450/*
3451 * con_throttle and con_unthrottle are only used for
3452 * paste_selection(), which has to stuff in a large number of
3453 * characters...
3454 */
3455static void con_throttle(struct tty_struct *tty)
3456{
3457}
3458
3459static void con_unthrottle(struct tty_struct *tty)
3460{
3461 struct vc_data *vc = tty->driver_data;
3462
3463 wake_up_interruptible(&vc->paste_wait);
3464}
3465
3466/*
3467 * Turn the Scroll-Lock LED on when the tty is stopped
3468 */
3469static void con_stop(struct tty_struct *tty)
3470{
3471 int console_num;
3472 if (!tty)
3473 return;
3474 console_num = tty->index;
3475 if (!vc_cons_allocated(console_num))
3476 return;
3477 vt_kbd_con_stop(console_num);
3478}
3479
3480/*
3481 * Turn the Scroll-Lock LED off when the console is started
3482 */
3483static void con_start(struct tty_struct *tty)
3484{
3485 int console_num;
3486 if (!tty)
3487 return;
3488 console_num = tty->index;
3489 if (!vc_cons_allocated(console_num))
3490 return;
3491 vt_kbd_con_start(console_num);
3492}
3493
3494static void con_flush_chars(struct tty_struct *tty)
3495{
3496 struct vc_data *vc = tty->driver_data;
3497
3498 if (in_interrupt()) /* from flush_to_ldisc */
3499 return;
3500
3501 console_lock();
3502 set_cursor(vc);
3503 console_unlock();
3504}
3505
3506/*
3507 * Allocate the console screen memory.
3508 */
3509static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3510{
3511 unsigned int currcons = tty->index;
3512 struct vc_data *vc;
3513 int ret;
3514
3515 console_lock();
3516 ret = vc_allocate(currcons);
3517 if (ret)
3518 goto unlock;
3519
3520 vc = vc_cons[currcons].d;
3521
3522 /* Still being freed */
3523 if (vc->port.tty) {
3524 ret = -ERESTARTSYS;
3525 goto unlock;
3526 }
3527
3528 ret = tty_port_install(&vc->port, driver, tty);
3529 if (ret)
3530 goto unlock;
3531
3532 tty->driver_data = vc;
3533 vc->port.tty = tty;
3534 tty_port_get(&vc->port);
3535
3536 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3537 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3538 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3539 }
3540 if (vc->vc_utf)
3541 tty->termios.c_iflag |= IUTF8;
3542 else
3543 tty->termios.c_iflag &= ~IUTF8;
3544unlock:
3545 console_unlock();
3546 return ret;
3547}
3548
3549static int con_open(struct tty_struct *tty, struct file *filp)
3550{
3551 /* everything done in install */
3552 return 0;
3553}
3554
3555
3556static void con_close(struct tty_struct *tty, struct file *filp)
3557{
3558 /* Nothing to do - we defer to shutdown */
3559}
3560
3561static void con_shutdown(struct tty_struct *tty)
3562{
3563 struct vc_data *vc = tty->driver_data;
3564 BUG_ON(vc == NULL);
3565 console_lock();
3566 vc->port.tty = NULL;
3567 console_unlock();
3568}
3569
3570static void con_cleanup(struct tty_struct *tty)
3571{
3572 struct vc_data *vc = tty->driver_data;
3573
3574 tty_port_put(&vc->port);
3575}
3576
3577/*
3578 * We can't deal with anything but the N_TTY ldisc,
3579 * because we can sleep in our write() routine.
3580 */
3581static int con_ldisc_ok(struct tty_struct *tty, int ldisc)
3582{
3583 return ldisc == N_TTY ? 0 : -EINVAL;
3584}
3585
3586static int default_color = 7; /* white */
3587static int default_italic_color = 2; // green (ASCII)
3588static int default_underline_color = 3; // cyan (ASCII)
3589module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3590module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3591module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3592
3593static void vc_init(struct vc_data *vc, int do_clear)
3594{
3595 int j, k ;
3596
3597 set_origin(vc);
3598 vc->vc_pos = vc->vc_origin;
3599 reset_vc(vc);
3600 for (j=k=0; j<16; j++) {
3601 vc->vc_palette[k++] = default_red[j] ;
3602 vc->vc_palette[k++] = default_grn[j] ;
3603 vc->vc_palette[k++] = default_blu[j] ;
3604 }
3605 vc->vc_def_color = default_color;
3606 vc->vc_ulcolor = default_underline_color;
3607 vc->vc_itcolor = default_italic_color;
3608 vc->vc_halfcolor = 0x08; /* grey */
3609 init_waitqueue_head(&vc->paste_wait);
3610 reset_terminal(vc, do_clear);
3611}
3612
3613/*
3614 * This routine initializes console interrupts, and does nothing
3615 * else. If you want the screen to clear, call tty_write with
3616 * the appropriate escape-sequence.
3617 */
3618
3619static int __init con_init(void)
3620{
3621 const char *display_desc = NULL;
3622 struct vc_data *vc;
3623 unsigned int currcons = 0, i;
3624
3625 console_lock();
3626
3627 if (!conswitchp)
3628 conswitchp = &dummy_con;
3629 display_desc = conswitchp->con_startup();
3630 if (!display_desc) {
3631 fg_console = 0;
3632 console_unlock();
3633 return 0;
3634 }
3635
3636 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3637 struct con_driver *con_driver = ®istered_con_driver[i];
3638
3639 if (con_driver->con == NULL) {
3640 con_driver->con = conswitchp;
3641 con_driver->desc = display_desc;
3642 con_driver->flag = CON_DRIVER_FLAG_INIT;
3643 con_driver->first = 0;
3644 con_driver->last = MAX_NR_CONSOLES - 1;
3645 break;
3646 }
3647 }
3648
3649 for (i = 0; i < MAX_NR_CONSOLES; i++)
3650 con_driver_map[i] = conswitchp;
3651
3652 if (blankinterval) {
3653 blank_state = blank_normal_wait;
3654 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3655 }
3656
3657 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3658 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3659 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3660 tty_port_init(&vc->port);
3661 visual_init(vc, currcons, true);
3662 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3663 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3664 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
3665 }
3666 currcons = fg_console = 0;
3667 master_display_fg = vc = vc_cons[currcons].d;
3668 set_origin(vc);
3669 save_screen(vc);
3670 gotoxy(vc, vc->state.x, vc->state.y);
3671 csi_J(vc, CSI_J_CURSOR_TO_END);
3672 update_screen(vc);
3673 pr_info("Console: %s %s %dx%d\n",
3674 vc->vc_can_do_color ? "colour" : "mono",
3675 display_desc, vc->vc_cols, vc->vc_rows);
3676
3677 console_unlock();
3678
3679#ifdef CONFIG_VT_CONSOLE
3680 register_console(&vt_console_driver);
3681#endif
3682 return 0;
3683}
3684console_initcall(con_init);
3685
3686static const struct tty_operations con_ops = {
3687 .install = con_install,
3688 .open = con_open,
3689 .close = con_close,
3690 .write = con_write,
3691 .write_room = con_write_room,
3692 .put_char = con_put_char,
3693 .flush_chars = con_flush_chars,
3694 .ioctl = vt_ioctl,
3695#ifdef CONFIG_COMPAT
3696 .compat_ioctl = vt_compat_ioctl,
3697#endif
3698 .stop = con_stop,
3699 .start = con_start,
3700 .throttle = con_throttle,
3701 .unthrottle = con_unthrottle,
3702 .resize = vt_resize,
3703 .shutdown = con_shutdown,
3704 .cleanup = con_cleanup,
3705 .ldisc_ok = con_ldisc_ok,
3706};
3707
3708static struct cdev vc0_cdev;
3709
3710static ssize_t show_tty_active(struct device *dev,
3711 struct device_attribute *attr, char *buf)
3712{
3713 return sprintf(buf, "tty%d\n", fg_console + 1);
3714}
3715static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3716
3717static struct attribute *vt_dev_attrs[] = {
3718 &dev_attr_active.attr,
3719 NULL
3720};
3721
3722ATTRIBUTE_GROUPS(vt_dev);
3723
3724int __init vty_init(const struct file_operations *console_fops)
3725{
3726 cdev_init(&vc0_cdev, console_fops);
3727 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3728 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3729 panic("Couldn't register /dev/tty0 driver\n");
3730 tty0dev = device_create_with_groups(&tty_class, NULL,
3731 MKDEV(TTY_MAJOR, 0), NULL,
3732 vt_dev_groups, "tty0");
3733 if (IS_ERR(tty0dev))
3734 tty0dev = NULL;
3735
3736 vcs_init();
3737
3738 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3739 TTY_DRIVER_RESET_TERMIOS);
3740 if (IS_ERR(console_driver))
3741 panic("Couldn't allocate console driver\n");
3742
3743 console_driver->name = "tty";
3744 console_driver->name_base = 1;
3745 console_driver->major = TTY_MAJOR;
3746 console_driver->minor_start = 1;
3747 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3748 console_driver->init_termios = tty_std_termios;
3749 if (default_utf8)
3750 console_driver->init_termios.c_iflag |= IUTF8;
3751 tty_set_operations(console_driver, &con_ops);
3752 if (tty_register_driver(console_driver))
3753 panic("Couldn't register console driver\n");
3754 kbd_init();
3755 console_map_init();
3756#ifdef CONFIG_MDA_CONSOLE
3757 mda_console_init();
3758#endif
3759 return 0;
3760}
3761
3762static const struct class vtconsole_class = {
3763 .name = "vtconsole",
3764};
3765
3766static int do_bind_con_driver(const struct consw *csw, int first, int last,
3767 int deflt)
3768{
3769 struct module *owner = csw->owner;
3770 const char *desc = NULL;
3771 struct con_driver *con_driver;
3772 int i, j = -1, k = -1, retval = -ENODEV;
3773
3774 if (!try_module_get(owner))
3775 return -ENODEV;
3776
3777 WARN_CONSOLE_UNLOCKED();
3778
3779 /* check if driver is registered */
3780 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3781 con_driver = ®istered_con_driver[i];
3782
3783 if (con_driver->con == csw) {
3784 desc = con_driver->desc;
3785 retval = 0;
3786 break;
3787 }
3788 }
3789
3790 if (retval)
3791 goto err;
3792
3793 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3794 csw->con_startup();
3795 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3796 }
3797
3798 if (deflt) {
3799 if (conswitchp)
3800 module_put(conswitchp->owner);
3801
3802 __module_get(owner);
3803 conswitchp = csw;
3804 }
3805
3806 first = max(first, con_driver->first);
3807 last = min(last, con_driver->last);
3808
3809 for (i = first; i <= last; i++) {
3810 int old_was_color;
3811 struct vc_data *vc = vc_cons[i].d;
3812
3813 if (con_driver_map[i])
3814 module_put(con_driver_map[i]->owner);
3815 __module_get(owner);
3816 con_driver_map[i] = csw;
3817
3818 if (!vc || !vc->vc_sw)
3819 continue;
3820
3821 j = i;
3822
3823 if (con_is_visible(vc)) {
3824 k = i;
3825 save_screen(vc);
3826 }
3827
3828 old_was_color = vc->vc_can_do_color;
3829 vc->vc_sw->con_deinit(vc);
3830 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3831 visual_init(vc, i, false);
3832 set_origin(vc);
3833 update_attr(vc);
3834
3835 /* If the console changed between mono <-> color, then
3836 * the attributes in the screenbuf will be wrong. The
3837 * following resets all attributes to something sane.
3838 */
3839 if (old_was_color != vc->vc_can_do_color)
3840 clear_buffer_attributes(vc);
3841 }
3842
3843 pr_info("Console: switching ");
3844 if (!deflt)
3845 pr_cont("consoles %d-%d ", first + 1, last + 1);
3846 if (j >= 0) {
3847 struct vc_data *vc = vc_cons[j].d;
3848
3849 pr_cont("to %s %s %dx%d\n",
3850 vc->vc_can_do_color ? "colour" : "mono",
3851 desc, vc->vc_cols, vc->vc_rows);
3852
3853 if (k >= 0) {
3854 vc = vc_cons[k].d;
3855 update_screen(vc);
3856 }
3857 } else {
3858 pr_cont("to %s\n", desc);
3859 }
3860
3861 retval = 0;
3862err:
3863 module_put(owner);
3864 return retval;
3865};
3866
3867
3868#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3869int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3870{
3871 struct module *owner = csw->owner;
3872 const struct consw *defcsw = NULL;
3873 struct con_driver *con_driver = NULL, *con_back = NULL;
3874 int i, retval = -ENODEV;
3875
3876 if (!try_module_get(owner))
3877 return -ENODEV;
3878
3879 WARN_CONSOLE_UNLOCKED();
3880
3881 /* check if driver is registered and if it is unbindable */
3882 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3883 con_driver = ®istered_con_driver[i];
3884
3885 if (con_driver->con == csw &&
3886 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3887 retval = 0;
3888 break;
3889 }
3890 }
3891
3892 if (retval)
3893 goto err;
3894
3895 retval = -ENODEV;
3896
3897 /* check if backup driver exists */
3898 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3899 con_back = ®istered_con_driver[i];
3900
3901 if (con_back->con && con_back->con != csw) {
3902 defcsw = con_back->con;
3903 retval = 0;
3904 break;
3905 }
3906 }
3907
3908 if (retval)
3909 goto err;
3910
3911 if (!con_is_bound(csw))
3912 goto err;
3913
3914 first = max(first, con_driver->first);
3915 last = min(last, con_driver->last);
3916
3917 for (i = first; i <= last; i++) {
3918 if (con_driver_map[i] == csw) {
3919 module_put(csw->owner);
3920 con_driver_map[i] = NULL;
3921 }
3922 }
3923
3924 if (!con_is_bound(defcsw)) {
3925 const struct consw *defconsw = conswitchp;
3926
3927 defcsw->con_startup();
3928 con_back->flag |= CON_DRIVER_FLAG_INIT;
3929 /*
3930 * vgacon may change the default driver to point
3931 * to dummycon, we restore it here...
3932 */
3933 conswitchp = defconsw;
3934 }
3935
3936 if (!con_is_bound(csw))
3937 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3938
3939 /* ignore return value, binding should not fail */
3940 do_bind_con_driver(defcsw, first, last, deflt);
3941err:
3942 module_put(owner);
3943 return retval;
3944
3945}
3946EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3947
3948static int vt_bind(struct con_driver *con)
3949{
3950 const struct consw *defcsw = NULL, *csw = NULL;
3951 int i, more = 1, first = -1, last = -1, deflt = 0;
3952
3953 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3954 goto err;
3955
3956 csw = con->con;
3957
3958 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3959 struct con_driver *con = ®istered_con_driver[i];
3960
3961 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3962 defcsw = con->con;
3963 break;
3964 }
3965 }
3966
3967 if (!defcsw)
3968 goto err;
3969
3970 while (more) {
3971 more = 0;
3972
3973 for (i = con->first; i <= con->last; i++) {
3974 if (con_driver_map[i] == defcsw) {
3975 if (first == -1)
3976 first = i;
3977 last = i;
3978 more = 1;
3979 } else if (first != -1)
3980 break;
3981 }
3982
3983 if (first == 0 && last == MAX_NR_CONSOLES -1)
3984 deflt = 1;
3985
3986 if (first != -1)
3987 do_bind_con_driver(csw, first, last, deflt);
3988
3989 first = -1;
3990 last = -1;
3991 deflt = 0;
3992 }
3993
3994err:
3995 return 0;
3996}
3997
3998static int vt_unbind(struct con_driver *con)
3999{
4000 const struct consw *csw = NULL;
4001 int i, more = 1, first = -1, last = -1, deflt = 0;
4002 int ret;
4003
4004 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
4005 goto err;
4006
4007 csw = con->con;
4008
4009 while (more) {
4010 more = 0;
4011
4012 for (i = con->first; i <= con->last; i++) {
4013 if (con_driver_map[i] == csw) {
4014 if (first == -1)
4015 first = i;
4016 last = i;
4017 more = 1;
4018 } else if (first != -1)
4019 break;
4020 }
4021
4022 if (first == 0 && last == MAX_NR_CONSOLES -1)
4023 deflt = 1;
4024
4025 if (first != -1) {
4026 ret = do_unbind_con_driver(csw, first, last, deflt);
4027 if (ret != 0)
4028 return ret;
4029 }
4030
4031 first = -1;
4032 last = -1;
4033 deflt = 0;
4034 }
4035
4036err:
4037 return 0;
4038}
4039#else
4040static inline int vt_bind(struct con_driver *con)
4041{
4042 return 0;
4043}
4044static inline int vt_unbind(struct con_driver *con)
4045{
4046 return 0;
4047}
4048#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
4049
4050static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
4051 const char *buf, size_t count)
4052{
4053 struct con_driver *con = dev_get_drvdata(dev);
4054 int bind = simple_strtoul(buf, NULL, 0);
4055
4056 console_lock();
4057
4058 if (bind)
4059 vt_bind(con);
4060 else
4061 vt_unbind(con);
4062
4063 console_unlock();
4064
4065 return count;
4066}
4067
4068static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
4069 char *buf)
4070{
4071 struct con_driver *con = dev_get_drvdata(dev);
4072 int bind;
4073
4074 console_lock();
4075 bind = con_is_bound(con->con);
4076 console_unlock();
4077
4078 return sysfs_emit(buf, "%i\n", bind);
4079}
4080
4081static ssize_t show_name(struct device *dev, struct device_attribute *attr,
4082 char *buf)
4083{
4084 struct con_driver *con = dev_get_drvdata(dev);
4085
4086 return sysfs_emit(buf, "%s %s\n",
4087 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
4088 con->desc);
4089
4090}
4091
4092static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
4093static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
4094
4095static struct attribute *con_dev_attrs[] = {
4096 &dev_attr_bind.attr,
4097 &dev_attr_name.attr,
4098 NULL
4099};
4100
4101ATTRIBUTE_GROUPS(con_dev);
4102
4103static int vtconsole_init_device(struct con_driver *con)
4104{
4105 con->flag |= CON_DRIVER_FLAG_ATTR;
4106 return 0;
4107}
4108
4109static void vtconsole_deinit_device(struct con_driver *con)
4110{
4111 con->flag &= ~CON_DRIVER_FLAG_ATTR;
4112}
4113
4114/**
4115 * con_is_bound - checks if driver is bound to the console
4116 * @csw: console driver
4117 *
4118 * RETURNS: zero if unbound, nonzero if bound
4119 *
4120 * Drivers can call this and if zero, they should release
4121 * all resources allocated on &consw.con_startup()
4122 */
4123int con_is_bound(const struct consw *csw)
4124{
4125 int i, bound = 0;
4126
4127 WARN_CONSOLE_UNLOCKED();
4128
4129 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4130 if (con_driver_map[i] == csw) {
4131 bound = 1;
4132 break;
4133 }
4134 }
4135
4136 return bound;
4137}
4138EXPORT_SYMBOL(con_is_bound);
4139
4140/**
4141 * con_is_visible - checks whether the current console is visible
4142 * @vc: virtual console
4143 *
4144 * RETURNS: zero if not visible, nonzero if visible
4145 */
4146bool con_is_visible(const struct vc_data *vc)
4147{
4148 WARN_CONSOLE_UNLOCKED();
4149
4150 return *vc->vc_display_fg == vc;
4151}
4152EXPORT_SYMBOL(con_is_visible);
4153
4154/**
4155 * con_debug_enter - prepare the console for the kernel debugger
4156 * @vc: virtual console
4157 *
4158 * Called when the console is taken over by the kernel debugger, this
4159 * function needs to save the current console state, then put the console
4160 * into a state suitable for the kernel debugger.
4161 */
4162void con_debug_enter(struct vc_data *vc)
4163{
4164 saved_fg_console = fg_console;
4165 saved_last_console = last_console;
4166 saved_want_console = want_console;
4167 saved_vc_mode = vc->vc_mode;
4168 saved_console_blanked = console_blanked;
4169 vc->vc_mode = KD_TEXT;
4170 console_blanked = 0;
4171 if (vc->vc_sw->con_debug_enter)
4172 vc->vc_sw->con_debug_enter(vc);
4173#ifdef CONFIG_KGDB_KDB
4174 /* Set the initial LINES variable if it is not already set */
4175 if (vc->vc_rows < 999) {
4176 int linecount;
4177 char lns[4];
4178 const char *setargs[3] = {
4179 "set",
4180 "LINES",
4181 lns,
4182 };
4183 if (kdbgetintenv(setargs[0], &linecount)) {
4184 snprintf(lns, 4, "%i", vc->vc_rows);
4185 kdb_set(2, setargs);
4186 }
4187 }
4188 if (vc->vc_cols < 999) {
4189 int colcount;
4190 char cols[4];
4191 const char *setargs[3] = {
4192 "set",
4193 "COLUMNS",
4194 cols,
4195 };
4196 if (kdbgetintenv(setargs[0], &colcount)) {
4197 snprintf(cols, 4, "%i", vc->vc_cols);
4198 kdb_set(2, setargs);
4199 }
4200 }
4201#endif /* CONFIG_KGDB_KDB */
4202}
4203EXPORT_SYMBOL_GPL(con_debug_enter);
4204
4205/**
4206 * con_debug_leave - restore console state
4207 *
4208 * Restore the console state to what it was before the kernel debugger
4209 * was invoked.
4210 */
4211void con_debug_leave(void)
4212{
4213 struct vc_data *vc;
4214
4215 fg_console = saved_fg_console;
4216 last_console = saved_last_console;
4217 want_console = saved_want_console;
4218 console_blanked = saved_console_blanked;
4219 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4220
4221 vc = vc_cons[fg_console].d;
4222 if (vc->vc_sw->con_debug_leave)
4223 vc->vc_sw->con_debug_leave(vc);
4224}
4225EXPORT_SYMBOL_GPL(con_debug_leave);
4226
4227static int do_register_con_driver(const struct consw *csw, int first, int last)
4228{
4229 struct module *owner = csw->owner;
4230 struct con_driver *con_driver;
4231 const char *desc;
4232 int i, retval;
4233
4234 WARN_CONSOLE_UNLOCKED();
4235
4236 if (!try_module_get(owner))
4237 return -ENODEV;
4238
4239 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4240 con_driver = ®istered_con_driver[i];
4241
4242 /* already registered */
4243 if (con_driver->con == csw) {
4244 retval = -EBUSY;
4245 goto err;
4246 }
4247 }
4248
4249 desc = csw->con_startup();
4250 if (!desc) {
4251 retval = -ENODEV;
4252 goto err;
4253 }
4254
4255 retval = -EINVAL;
4256
4257 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4258 con_driver = ®istered_con_driver[i];
4259
4260 if (con_driver->con == NULL &&
4261 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4262 con_driver->con = csw;
4263 con_driver->desc = desc;
4264 con_driver->node = i;
4265 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4266 CON_DRIVER_FLAG_INIT;
4267 con_driver->first = first;
4268 con_driver->last = last;
4269 retval = 0;
4270 break;
4271 }
4272 }
4273
4274 if (retval)
4275 goto err;
4276
4277 con_driver->dev =
4278 device_create_with_groups(&vtconsole_class, NULL,
4279 MKDEV(0, con_driver->node),
4280 con_driver, con_dev_groups,
4281 "vtcon%i", con_driver->node);
4282 if (IS_ERR(con_driver->dev)) {
4283 pr_warn("Unable to create device for %s; errno = %ld\n",
4284 con_driver->desc, PTR_ERR(con_driver->dev));
4285 con_driver->dev = NULL;
4286 } else {
4287 vtconsole_init_device(con_driver);
4288 }
4289
4290err:
4291 module_put(owner);
4292 return retval;
4293}
4294
4295
4296/**
4297 * do_unregister_con_driver - unregister console driver from console layer
4298 * @csw: console driver
4299 *
4300 * DESCRIPTION: All drivers that registers to the console layer must
4301 * call this function upon exit, or if the console driver is in a state
4302 * where it won't be able to handle console services, such as the
4303 * framebuffer console without loaded framebuffer drivers.
4304 *
4305 * The driver must unbind first prior to unregistration.
4306 */
4307int do_unregister_con_driver(const struct consw *csw)
4308{
4309 int i;
4310
4311 /* cannot unregister a bound driver */
4312 if (con_is_bound(csw))
4313 return -EBUSY;
4314
4315 if (csw == conswitchp)
4316 return -EINVAL;
4317
4318 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4319 struct con_driver *con_driver = ®istered_con_driver[i];
4320
4321 if (con_driver->con == csw) {
4322 /*
4323 * Defer the removal of the sysfs entries since that
4324 * will acquire the kernfs s_active lock and we can't
4325 * acquire this lock while holding the console lock:
4326 * the unbind sysfs entry imposes already the opposite
4327 * order. Reset con already here to prevent any later
4328 * lookup to succeed and mark this slot as zombie, so
4329 * it won't get reused until we complete the removal
4330 * in the deferred work.
4331 */
4332 con_driver->con = NULL;
4333 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4334 schedule_work(&con_driver_unregister_work);
4335
4336 return 0;
4337 }
4338 }
4339
4340 return -ENODEV;
4341}
4342EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4343
4344static void con_driver_unregister_callback(struct work_struct *ignored)
4345{
4346 int i;
4347
4348 console_lock();
4349
4350 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4351 struct con_driver *con_driver = ®istered_con_driver[i];
4352
4353 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4354 continue;
4355
4356 console_unlock();
4357
4358 vtconsole_deinit_device(con_driver);
4359 device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
4360
4361 console_lock();
4362
4363 if (WARN_ON_ONCE(con_driver->con))
4364 con_driver->con = NULL;
4365 con_driver->desc = NULL;
4366 con_driver->dev = NULL;
4367 con_driver->node = 0;
4368 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4369 con_driver->flag = 0;
4370 con_driver->first = 0;
4371 con_driver->last = 0;
4372 }
4373
4374 console_unlock();
4375}
4376
4377/*
4378 * If we support more console drivers, this function is used
4379 * when a driver wants to take over some existing consoles
4380 * and become default driver for newly opened ones.
4381 *
4382 * do_take_over_console is basically a register followed by bind
4383 */
4384int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4385{
4386 int err;
4387
4388 err = do_register_con_driver(csw, first, last);
4389 /*
4390 * If we get an busy error we still want to bind the console driver
4391 * and return success, as we may have unbound the console driver
4392 * but not unregistered it.
4393 */
4394 if (err == -EBUSY)
4395 err = 0;
4396 if (!err)
4397 do_bind_con_driver(csw, first, last, deflt);
4398
4399 return err;
4400}
4401EXPORT_SYMBOL_GPL(do_take_over_console);
4402
4403
4404/*
4405 * give_up_console is a wrapper to unregister_con_driver. It will only
4406 * work if driver is fully unbound.
4407 */
4408void give_up_console(const struct consw *csw)
4409{
4410 console_lock();
4411 do_unregister_con_driver(csw);
4412 console_unlock();
4413}
4414EXPORT_SYMBOL(give_up_console);
4415
4416static int __init vtconsole_class_init(void)
4417{
4418 int i;
4419
4420 i = class_register(&vtconsole_class);
4421 if (i)
4422 pr_warn("Unable to create vt console class; errno = %d\n", i);
4423
4424 /* Add system drivers to sysfs */
4425 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4426 struct con_driver *con = ®istered_con_driver[i];
4427
4428 if (con->con && !con->dev) {
4429 con->dev =
4430 device_create_with_groups(&vtconsole_class, NULL,
4431 MKDEV(0, con->node),
4432 con, con_dev_groups,
4433 "vtcon%i", con->node);
4434
4435 if (IS_ERR(con->dev)) {
4436 pr_warn("Unable to create device for %s; errno = %ld\n",
4437 con->desc, PTR_ERR(con->dev));
4438 con->dev = NULL;
4439 } else {
4440 vtconsole_init_device(con);
4441 }
4442 }
4443 }
4444
4445 return 0;
4446}
4447postcore_initcall(vtconsole_class_init);
4448
4449/*
4450 * Screen blanking
4451 */
4452
4453static int set_vesa_blanking(u8 __user *mode_user)
4454{
4455 u8 mode;
4456
4457 if (get_user(mode, mode_user))
4458 return -EFAULT;
4459
4460 console_lock();
4461 vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
4462 console_unlock();
4463
4464 return 0;
4465}
4466
4467void do_blank_screen(int entering_gfx)
4468{
4469 struct vc_data *vc = vc_cons[fg_console].d;
4470 int i;
4471
4472 might_sleep();
4473
4474 WARN_CONSOLE_UNLOCKED();
4475
4476 if (console_blanked) {
4477 if (blank_state == blank_vesa_wait) {
4478 blank_state = blank_off;
4479 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4480 }
4481 return;
4482 }
4483
4484 /* entering graphics mode? */
4485 if (entering_gfx) {
4486 hide_cursor(vc);
4487 save_screen(vc);
4488 vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
4489 console_blanked = fg_console + 1;
4490 blank_state = blank_off;
4491 set_origin(vc);
4492 return;
4493 }
4494
4495 blank_state = blank_off;
4496
4497 /* don't blank graphics */
4498 if (vc->vc_mode != KD_TEXT) {
4499 console_blanked = fg_console + 1;
4500 return;
4501 }
4502
4503 hide_cursor(vc);
4504 del_timer_sync(&console_timer);
4505 blank_timer_expired = 0;
4506
4507 save_screen(vc);
4508 /* In case we need to reset origin, blanking hook returns 1 */
4509 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
4510 (vesa_blank_mode + 1), 0);
4511 console_blanked = fg_console + 1;
4512 if (i)
4513 set_origin(vc);
4514
4515 if (console_blank_hook && console_blank_hook(1))
4516 return;
4517
4518 if (vesa_off_interval && vesa_blank_mode) {
4519 blank_state = blank_vesa_wait;
4520 mod_timer(&console_timer, jiffies + vesa_off_interval);
4521 }
4522 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4523}
4524EXPORT_SYMBOL(do_blank_screen);
4525
4526/*
4527 * Called by timer as well as from vt_console_driver
4528 */
4529void do_unblank_screen(int leaving_gfx)
4530{
4531 struct vc_data *vc;
4532
4533 /* This should now always be called from a "sane" (read: can schedule)
4534 * context for the sake of the low level drivers, except in the special
4535 * case of oops_in_progress
4536 */
4537 if (!oops_in_progress)
4538 might_sleep();
4539
4540 WARN_CONSOLE_UNLOCKED();
4541
4542 ignore_poke = 0;
4543 if (!console_blanked)
4544 return;
4545 if (!vc_cons_allocated(fg_console)) {
4546 /* impossible */
4547 pr_warn("unblank_screen: tty %d not allocated ??\n",
4548 fg_console + 1);
4549 return;
4550 }
4551 vc = vc_cons[fg_console].d;
4552 if (vc->vc_mode != KD_TEXT)
4553 return; /* but leave console_blanked != 0 */
4554
4555 if (blankinterval) {
4556 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4557 blank_state = blank_normal_wait;
4558 }
4559
4560 console_blanked = 0;
4561 if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
4562 /* Low-level driver cannot restore -> do it ourselves */
4563 update_screen(vc);
4564 if (console_blank_hook)
4565 console_blank_hook(0);
4566 set_palette(vc);
4567 set_cursor(vc);
4568 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4569}
4570EXPORT_SYMBOL(do_unblank_screen);
4571
4572/*
4573 * This is called by the outside world to cause a forced unblank, mostly for
4574 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4575 * call it with 1 as an argument and so force a mode restore... that may kill
4576 * X or at least garbage the screen but would also make the Oops visible...
4577 */
4578static void unblank_screen(void)
4579{
4580 do_unblank_screen(0);
4581}
4582
4583/*
4584 * We defer the timer blanking to work queue so it can take the console mutex
4585 * (console operations can still happen at irq time, but only from printk which
4586 * has the console mutex. Not perfect yet, but better than no locking
4587 */
4588static void blank_screen_t(struct timer_list *unused)
4589{
4590 blank_timer_expired = 1;
4591 schedule_work(&console_work);
4592}
4593
4594void poke_blanked_console(void)
4595{
4596 WARN_CONSOLE_UNLOCKED();
4597
4598 /* Add this so we quickly catch whoever might call us in a non
4599 * safe context. Nowadays, unblank_screen() isn't to be called in
4600 * atomic contexts and is allowed to schedule (with the special case
4601 * of oops_in_progress, but that isn't of any concern for this
4602 * function. --BenH.
4603 */
4604 might_sleep();
4605
4606 /* This isn't perfectly race free, but a race here would be mostly harmless,
4607 * at worst, we'll do a spurious blank and it's unlikely
4608 */
4609 del_timer(&console_timer);
4610 blank_timer_expired = 0;
4611
4612 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4613 return;
4614 if (console_blanked)
4615 unblank_screen();
4616 else if (blankinterval) {
4617 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4618 blank_state = blank_normal_wait;
4619 }
4620}
4621
4622/*
4623 * Palettes
4624 */
4625
4626static void set_palette(struct vc_data *vc)
4627{
4628 WARN_CONSOLE_UNLOCKED();
4629
4630 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4631 vc->vc_sw->con_set_palette(vc, color_table);
4632}
4633
4634/*
4635 * Load palette into the DAC registers. arg points to a colour
4636 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4637 */
4638
4639int con_set_cmap(unsigned char __user *arg)
4640{
4641 int i, j, k;
4642 unsigned char colormap[3*16];
4643
4644 if (copy_from_user(colormap, arg, sizeof(colormap)))
4645 return -EFAULT;
4646
4647 console_lock();
4648 for (i = k = 0; i < 16; i++) {
4649 default_red[i] = colormap[k++];
4650 default_grn[i] = colormap[k++];
4651 default_blu[i] = colormap[k++];
4652 }
4653 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4654 if (!vc_cons_allocated(i))
4655 continue;
4656 for (j = k = 0; j < 16; j++) {
4657 vc_cons[i].d->vc_palette[k++] = default_red[j];
4658 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4659 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4660 }
4661 set_palette(vc_cons[i].d);
4662 }
4663 console_unlock();
4664
4665 return 0;
4666}
4667
4668int con_get_cmap(unsigned char __user *arg)
4669{
4670 int i, k;
4671 unsigned char colormap[3*16];
4672
4673 console_lock();
4674 for (i = k = 0; i < 16; i++) {
4675 colormap[k++] = default_red[i];
4676 colormap[k++] = default_grn[i];
4677 colormap[k++] = default_blu[i];
4678 }
4679 console_unlock();
4680
4681 if (copy_to_user(arg, colormap, sizeof(colormap)))
4682 return -EFAULT;
4683
4684 return 0;
4685}
4686
4687void reset_palette(struct vc_data *vc)
4688{
4689 int j, k;
4690 for (j=k=0; j<16; j++) {
4691 vc->vc_palette[k++] = default_red[j];
4692 vc->vc_palette[k++] = default_grn[j];
4693 vc->vc_palette[k++] = default_blu[j];
4694 }
4695 set_palette(vc);
4696}
4697
4698/*
4699 * Font switching
4700 *
4701 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4702 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4703 * (shorts/ints, depending on width) reserved for each character which is
4704 * kinda wasty, but this is done in order to maintain compatibility with the
4705 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4706 * into its favorite format (maybe we should add a `fontoffset' field to the
4707 * `display' structure so we won't have to convert the fontdata all the time.
4708 * /Jes
4709 */
4710
4711#define max_font_width 64
4712#define max_font_height 128
4713#define max_font_glyphs 512
4714#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
4715
4716static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4717{
4718 struct console_font font;
4719 int rc = -EINVAL;
4720 int c;
4721 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
4722
4723 if (vpitch > max_font_height)
4724 return -EINVAL;
4725
4726 if (op->data) {
4727 font.data = kvzalloc(max_font_size, GFP_KERNEL);
4728 if (!font.data)
4729 return -ENOMEM;
4730 } else
4731 font.data = NULL;
4732
4733 console_lock();
4734 if (vc->vc_mode != KD_TEXT)
4735 rc = -EINVAL;
4736 else if (vc->vc_sw->con_font_get)
4737 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
4738 else
4739 rc = -ENOSYS;
4740 console_unlock();
4741
4742 if (rc)
4743 goto out;
4744
4745 c = (font.width+7)/8 * vpitch * font.charcount;
4746
4747 if (op->data && font.charcount > op->charcount)
4748 rc = -ENOSPC;
4749 if (font.width > op->width || font.height > op->height)
4750 rc = -ENOSPC;
4751 if (rc)
4752 goto out;
4753
4754 op->height = font.height;
4755 op->width = font.width;
4756 op->charcount = font.charcount;
4757
4758 if (op->data && copy_to_user(op->data, font.data, c))
4759 rc = -EFAULT;
4760
4761out:
4762 kvfree(font.data);
4763 return rc;
4764}
4765
4766static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
4767{
4768 struct console_font font;
4769 int rc = -EINVAL;
4770 int size;
4771 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
4772
4773 if (vc->vc_mode != KD_TEXT)
4774 return -EINVAL;
4775 if (!op->data)
4776 return -EINVAL;
4777 if (op->charcount > max_font_glyphs)
4778 return -EINVAL;
4779 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4780 op->height > max_font_height)
4781 return -EINVAL;
4782 if (vpitch < op->height)
4783 return -EINVAL;
4784 size = (op->width+7)/8 * vpitch * op->charcount;
4785 if (size > max_font_size)
4786 return -ENOSPC;
4787
4788 font.data = memdup_user(op->data, size);
4789 if (IS_ERR(font.data))
4790 return PTR_ERR(font.data);
4791
4792 font.charcount = op->charcount;
4793 font.width = op->width;
4794 font.height = op->height;
4795
4796 console_lock();
4797 if (vc->vc_mode != KD_TEXT)
4798 rc = -EINVAL;
4799 else if (vc->vc_sw->con_font_set) {
4800 if (vc_is_sel(vc))
4801 clear_selection();
4802 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
4803 } else
4804 rc = -ENOSYS;
4805 console_unlock();
4806 kfree(font.data);
4807 return rc;
4808}
4809
4810static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4811{
4812 struct console_font font = {.width = op->width, .height = op->height};
4813 char name[MAX_FONT_NAME];
4814 char *s = name;
4815 int rc;
4816
4817
4818 if (!op->data)
4819 s = NULL;
4820 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4821 return -EFAULT;
4822 else
4823 name[MAX_FONT_NAME - 1] = 0;
4824
4825 console_lock();
4826 if (vc->vc_mode != KD_TEXT) {
4827 console_unlock();
4828 return -EINVAL;
4829 }
4830 if (vc->vc_sw->con_font_default) {
4831 if (vc_is_sel(vc))
4832 clear_selection();
4833 rc = vc->vc_sw->con_font_default(vc, &font, s);
4834 } else
4835 rc = -ENOSYS;
4836 console_unlock();
4837 if (!rc) {
4838 op->width = font.width;
4839 op->height = font.height;
4840 }
4841 return rc;
4842}
4843
4844int con_font_op(struct vc_data *vc, struct console_font_op *op)
4845{
4846 switch (op->op) {
4847 case KD_FONT_OP_SET:
4848 case KD_FONT_OP_SET_TALL:
4849 return con_font_set(vc, op);
4850 case KD_FONT_OP_GET:
4851 case KD_FONT_OP_GET_TALL:
4852 return con_font_get(vc, op);
4853 case KD_FONT_OP_SET_DEFAULT:
4854 return con_font_default(vc, op);
4855 case KD_FONT_OP_COPY:
4856 /* was buggy and never really used */
4857 return -EINVAL;
4858 }
4859 return -ENOSYS;
4860}
4861
4862/*
4863 * Interface exported to selection and vcs.
4864 */
4865
4866/* used by selection */
4867u16 screen_glyph(const struct vc_data *vc, int offset)
4868{
4869 u16 w = scr_readw(screenpos(vc, offset, true));
4870 u16 c = w & 0xff;
4871
4872 if (w & vc->vc_hi_font_mask)
4873 c |= 0x100;
4874 return c;
4875}
4876EXPORT_SYMBOL_GPL(screen_glyph);
4877
4878u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4879{
4880 u32 **uni_lines = vc->vc_uni_lines;
4881
4882 if (uni_lines)
4883 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
4884
4885 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4886}
4887EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4888
4889/* used by vcs - note the word offset */
4890unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4891{
4892 return screenpos(vc, 2 * w_offset, viewed);
4893}
4894EXPORT_SYMBOL_GPL(screen_pos);
4895
4896void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4897{
4898 /* clamp values if they don't fit */
4899 xy[0] = min(vc->state.x, 0xFFu);
4900 xy[1] = min(vc->state.y, 0xFFu);
4901}
4902
4903void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4904{
4905 hide_cursor(vc);
4906 gotoxy(vc, xy[0], xy[1]);
4907 set_cursor(vc);
4908}
4909
4910u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4911{
4912 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4913 return softcursor_original;
4914 return scr_readw(org);
4915}
4916
4917void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4918{
4919 scr_writew(val, org);
4920 if ((unsigned long)org == vc->vc_pos) {
4921 softcursor_original = -1;
4922 add_softcursor(vc);
4923 }
4924}
4925
4926void vcs_scr_updated(struct vc_data *vc)
4927{
4928 notify_update(vc);
4929}