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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];
138
139#ifndef VT_SINGLE_DRIVER
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141#endif
142
143static int con_open(struct tty_struct *, struct file *);
144static void vc_init(struct vc_data *vc, unsigned int rows,
145 unsigned int cols, int do_clear);
146static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147static void save_cur(struct vc_data *vc);
148static void reset_terminal(struct vc_data *vc, int do_clear);
149static void con_flush_chars(struct tty_struct *tty);
150static int set_vesa_blanking(char __user *p);
151static void set_cursor(struct vc_data *vc);
152static void hide_cursor(struct vc_data *vc);
153static void console_callback(struct work_struct *ignored);
154static void con_driver_unregister_callback(struct work_struct *ignored);
155static void blank_screen_t(struct timer_list *unused);
156static void set_palette(struct vc_data *vc);
157static void unblank_screen(void);
158
159#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
160
161int default_utf8 = true;
162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165
166static int cur_default = CUR_UNDERLINE;
167module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
169/*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int 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;
193int last_console;
194int want_console = -1;
195static int saved_fg_console;
196static int saved_last_console;
197static int saved_want_console;
198static int saved_vc_mode;
199static int saved_console_blanked;
200
201/*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207static struct vc_data *master_display_fg;
208
209/*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216/*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219static int scrollback_delta;
220
221/*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225int (*console_blank_hook)(int);
226
227static DEFINE_TIMER(console_timer, blank_screen_t);
228static int blank_state;
229static int blank_timer_expired;
230enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234};
235
236/*
237 * /sys/class/tty/tty0/
238 *
239 * the attribute 'active' contains the name of the current vc
240 * console and it supports poll() to detect vc switches
241 */
242static struct device *tty0dev;
243
244/*
245 * Notifier list for console events.
246 */
247static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249int register_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255int unregister_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261static void notify_write(struct vc_data *vc, unsigned int unicode)
262{
263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
265}
266
267static void notify_update(struct vc_data *vc)
268{
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
271}
272/*
273 * Low-Level Functions
274 */
275
276static inline bool con_is_fg(const struct vc_data *vc)
277{
278 return vc->vc_num == fg_console;
279}
280
281static inline bool con_should_update(const struct vc_data *vc)
282{
283 return con_is_visible(vc) && !console_blanked;
284}
285
286static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
287 bool viewed)
288{
289 unsigned short *p;
290
291 if (!viewed)
292 p = (unsigned short *)(vc->vc_origin + offset);
293 else if (!vc->vc_sw->con_screen_pos)
294 p = (unsigned short *)(vc->vc_visible_origin + offset);
295 else
296 p = vc->vc_sw->con_screen_pos(vc, offset);
297 return p;
298}
299
300/* Called from the keyboard irq path.. */
301static inline void scrolldelta(int lines)
302{
303 /* FIXME */
304 /* scrolldelta needs some kind of consistency lock, but the BKL was
305 and still is not protecting versus the scheduled back end */
306 scrollback_delta += lines;
307 schedule_console_callback();
308}
309
310void schedule_console_callback(void)
311{
312 schedule_work(&console_work);
313}
314
315/*
316 * Code to manage unicode-based screen buffers
317 */
318
319#ifdef NO_VC_UNI_SCREEN
320/* this disables and optimizes related code away at compile time */
321#define get_vc_uniscr(vc) NULL
322#else
323#define get_vc_uniscr(vc) vc->vc_uni_screen
324#endif
325
326#define VC_UNI_SCREEN_DEBUG 0
327
328typedef uint32_t char32_t;
329
330/*
331 * Our screen buffer is preceded by an array of line pointers so that
332 * scrolling only implies some pointer shuffling.
333 */
334struct uni_screen {
335 char32_t *lines[0];
336};
337
338static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
339{
340 struct uni_screen *uniscr;
341 void *p;
342 unsigned int memsize, i;
343
344 /* allocate everything in one go */
345 memsize = cols * rows * sizeof(char32_t);
346 memsize += rows * sizeof(char32_t *);
347 p = vzalloc(memsize);
348 if (!p)
349 return NULL;
350
351 /* initial line pointers */
352 uniscr = p;
353 p = uniscr->lines + rows;
354 for (i = 0; i < rows; i++) {
355 uniscr->lines[i] = p;
356 p += cols * sizeof(char32_t);
357 }
358 return uniscr;
359}
360
361static void vc_uniscr_free(struct uni_screen *uniscr)
362{
363 vfree(uniscr);
364}
365
366static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
367{
368 vc_uniscr_free(vc->vc_uni_screen);
369 vc->vc_uni_screen = new_uniscr;
370}
371
372static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
373{
374 struct uni_screen *uniscr = get_vc_uniscr(vc);
375
376 if (uniscr)
377 uniscr->lines[vc->state.y][vc->state.x] = uc;
378}
379
380static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
381{
382 struct uni_screen *uniscr = get_vc_uniscr(vc);
383
384 if (uniscr) {
385 char32_t *ln = uniscr->lines[vc->state.y];
386 unsigned int x = vc->state.x, cols = vc->vc_cols;
387
388 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
389 memset32(&ln[x], ' ', nr);
390 }
391}
392
393static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
394{
395 struct uni_screen *uniscr = get_vc_uniscr(vc);
396
397 if (uniscr) {
398 char32_t *ln = uniscr->lines[vc->state.y];
399 unsigned int x = vc->state.x, cols = vc->vc_cols;
400
401 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
402 memset32(&ln[cols - nr], ' ', nr);
403 }
404}
405
406static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
407 unsigned int nr)
408{
409 struct uni_screen *uniscr = get_vc_uniscr(vc);
410
411 if (uniscr) {
412 char32_t *ln = uniscr->lines[vc->state.y];
413
414 memset32(&ln[x], ' ', nr);
415 }
416}
417
418static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
419 unsigned int nr)
420{
421 struct uni_screen *uniscr = get_vc_uniscr(vc);
422
423 if (uniscr) {
424 unsigned int cols = vc->vc_cols;
425
426 while (nr--)
427 memset32(uniscr->lines[y++], ' ', cols);
428 }
429}
430
431static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
432 enum con_scroll dir, unsigned int nr)
433{
434 struct uni_screen *uniscr = get_vc_uniscr(vc);
435
436 if (uniscr) {
437 unsigned int i, j, k, sz, d, clear;
438
439 sz = b - t;
440 clear = b - nr;
441 d = nr;
442 if (dir == SM_DOWN) {
443 clear = t;
444 d = sz - nr;
445 }
446 for (i = 0; i < gcd(d, sz); i++) {
447 char32_t *tmp = uniscr->lines[t + i];
448 j = i;
449 while (1) {
450 k = j + d;
451 if (k >= sz)
452 k -= sz;
453 if (k == i)
454 break;
455 uniscr->lines[t + j] = uniscr->lines[t + k];
456 j = k;
457 }
458 uniscr->lines[t + j] = tmp;
459 }
460 vc_uniscr_clear_lines(vc, clear, nr);
461 }
462}
463
464static void vc_uniscr_copy_area(struct uni_screen *dst,
465 unsigned int dst_cols,
466 unsigned int dst_rows,
467 struct uni_screen *src,
468 unsigned int src_cols,
469 unsigned int src_top_row,
470 unsigned int src_bot_row)
471{
472 unsigned int dst_row = 0;
473
474 if (!dst)
475 return;
476
477 while (src_top_row < src_bot_row) {
478 char32_t *src_line = src->lines[src_top_row];
479 char32_t *dst_line = dst->lines[dst_row];
480
481 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
482 if (dst_cols - src_cols)
483 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
484 src_top_row++;
485 dst_row++;
486 }
487 while (dst_row < dst_rows) {
488 char32_t *dst_line = dst->lines[dst_row];
489
490 memset32(dst_line, ' ', dst_cols);
491 dst_row++;
492 }
493}
494
495/*
496 * Called from vcs_read() to make sure unicode screen retrieval is possible.
497 * This will initialize the unicode screen buffer if not already done.
498 * This returns 0 if OK, or a negative error code otherwise.
499 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
500 */
501int vc_uniscr_check(struct vc_data *vc)
502{
503 struct uni_screen *uniscr;
504 unsigned short *p;
505 int x, y, mask;
506
507 if (__is_defined(NO_VC_UNI_SCREEN))
508 return -EOPNOTSUPP;
509
510 WARN_CONSOLE_UNLOCKED();
511
512 if (!vc->vc_utf)
513 return -ENODATA;
514
515 if (vc->vc_uni_screen)
516 return 0;
517
518 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
519 if (!uniscr)
520 return -ENOMEM;
521
522 /*
523 * Let's populate it initially with (imperfect) reverse translation.
524 * This is the next best thing we can do short of having it enabled
525 * from the start even when no users rely on this functionality. True
526 * unicode content will be available after a complete screen refresh.
527 */
528 p = (unsigned short *)vc->vc_origin;
529 mask = vc->vc_hi_font_mask | 0xff;
530 for (y = 0; y < vc->vc_rows; y++) {
531 char32_t *line = uniscr->lines[y];
532 for (x = 0; x < vc->vc_cols; x++) {
533 u16 glyph = scr_readw(p++) & mask;
534 line[x] = inverse_translate(vc, glyph, true);
535 }
536 }
537
538 vc->vc_uni_screen = uniscr;
539 return 0;
540}
541
542/*
543 * Called from vcs_read() to get the unicode data from the screen.
544 * This must be preceded by a successful call to vc_uniscr_check() once
545 * the console lock has been taken.
546 */
547void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
548 unsigned int row, unsigned int col, unsigned int nr)
549{
550 struct uni_screen *uniscr = get_vc_uniscr(vc);
551 int offset = row * vc->vc_size_row + col * 2;
552 unsigned long pos;
553
554 BUG_ON(!uniscr);
555
556 pos = (unsigned long)screenpos(vc, offset, viewed);
557 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
558 /*
559 * Desired position falls in the main screen buffer.
560 * However the actual row/col might be different if
561 * scrollback is active.
562 */
563 row = (pos - vc->vc_origin) / vc->vc_size_row;
564 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
565 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
566 } else {
567 /*
568 * Scrollback is active. For now let's simply backtranslate
569 * the screen glyphs until the unicode screen buffer does
570 * synchronize with console display drivers for a scrollback
571 * buffer of its own.
572 */
573 u16 *p = (u16 *)pos;
574 int mask = vc->vc_hi_font_mask | 0xff;
575 char32_t *uni_buf = dest;
576 while (nr--) {
577 u16 glyph = scr_readw(p++) & mask;
578 *uni_buf++ = inverse_translate(vc, glyph, true);
579 }
580 }
581}
582
583/* this is for validation and debugging only */
584static void vc_uniscr_debug_check(struct vc_data *vc)
585{
586 struct uni_screen *uniscr = get_vc_uniscr(vc);
587 unsigned short *p;
588 int x, y, mask;
589
590 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
591 return;
592
593 WARN_CONSOLE_UNLOCKED();
594
595 /*
596 * Make sure our unicode screen translates into the same glyphs
597 * as the actual screen. This is brutal indeed.
598 */
599 p = (unsigned short *)vc->vc_origin;
600 mask = vc->vc_hi_font_mask | 0xff;
601 for (y = 0; y < vc->vc_rows; y++) {
602 char32_t *line = uniscr->lines[y];
603 for (x = 0; x < vc->vc_cols; x++) {
604 u16 glyph = scr_readw(p++) & mask;
605 char32_t uc = line[x];
606 int tc = conv_uni_to_pc(vc, uc);
607 if (tc == -4)
608 tc = conv_uni_to_pc(vc, 0xfffd);
609 if (tc == -4)
610 tc = conv_uni_to_pc(vc, '?');
611 if (tc != glyph)
612 pr_err_ratelimited(
613 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
614 __func__, x, y, glyph, tc);
615 }
616 }
617}
618
619
620static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
621 enum con_scroll dir, unsigned int nr)
622{
623 u16 *clear, *d, *s;
624
625 if (t + nr >= b)
626 nr = b - t - 1;
627 if (b > vc->vc_rows || t >= b || nr < 1)
628 return;
629 vc_uniscr_scroll(vc, t, b, dir, nr);
630 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
631 return;
632
633 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
634 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
635
636 if (dir == SM_UP) {
637 clear = s + (b - t - nr) * vc->vc_cols;
638 swap(s, d);
639 }
640 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
641 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
642}
643
644static void do_update_region(struct vc_data *vc, unsigned long start, int count)
645{
646 unsigned int xx, yy, offset;
647 u16 *p;
648
649 p = (u16 *) start;
650 if (!vc->vc_sw->con_getxy) {
651 offset = (start - vc->vc_origin) / 2;
652 xx = offset % vc->vc_cols;
653 yy = offset / vc->vc_cols;
654 } else {
655 int nxx, nyy;
656 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
657 xx = nxx; yy = nyy;
658 }
659 for(;;) {
660 u16 attrib = scr_readw(p) & 0xff00;
661 int startx = xx;
662 u16 *q = p;
663 while (xx < vc->vc_cols && count) {
664 if (attrib != (scr_readw(p) & 0xff00)) {
665 if (p > q)
666 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
667 startx = xx;
668 q = p;
669 attrib = scr_readw(p) & 0xff00;
670 }
671 p++;
672 xx++;
673 count--;
674 }
675 if (p > q)
676 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
677 if (!count)
678 break;
679 xx = 0;
680 yy++;
681 if (vc->vc_sw->con_getxy) {
682 p = (u16 *)start;
683 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
684 }
685 }
686}
687
688void update_region(struct vc_data *vc, unsigned long start, int count)
689{
690 WARN_CONSOLE_UNLOCKED();
691
692 if (con_should_update(vc)) {
693 hide_cursor(vc);
694 do_update_region(vc, start, count);
695 set_cursor(vc);
696 }
697}
698
699/* Structure of attributes is hardware-dependent */
700
701static u8 build_attr(struct vc_data *vc, u8 _color,
702 enum vc_intensity _intensity, bool _blink, bool _underline,
703 bool _reverse, bool _italic)
704{
705 if (vc->vc_sw->con_build_attr)
706 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 _blink, _underline, _reverse, _italic);
708
709/*
710 * ++roman: I completely changed the attribute format for monochrome
711 * mode (!can_do_color). The formerly used MDA (monochrome display
712 * adapter) format didn't allow the combination of certain effects.
713 * Now the attribute is just a bit vector:
714 * Bit 0..1: intensity (0..2)
715 * Bit 2 : underline
716 * Bit 3 : reverse
717 * Bit 7 : blink
718 */
719 {
720 u8 a = _color;
721 if (!vc->vc_can_do_color)
722 return _intensity |
723 (_italic << 1) |
724 (_underline << 2) |
725 (_reverse << 3) |
726 (_blink << 7);
727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
730 a = (a & 0xf0) | vc->vc_ulcolor;
731 else if (_intensity == VCI_HALF_BRIGHT)
732 a = (a & 0xf0) | vc->vc_halfcolor;
733 if (_reverse)
734 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
735 if (_blink)
736 a ^= 0x80;
737 if (_intensity == VCI_BOLD)
738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
743}
744
745static void update_attr(struct vc_data *vc)
746{
747 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
748 vc->state.blink, vc->state.underline,
749 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
750 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
751 VCI_NORMAL, vc->state.blink, false,
752 vc->vc_decscnm, false) << 8);
753}
754
755/* Note: inverting the screen twice should revert to the original state */
756void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
757{
758 unsigned short *p;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 count /= 2;
763 p = screenpos(vc, offset, viewed);
764 if (vc->vc_sw->con_invert_region) {
765 vc->vc_sw->con_invert_region(vc, p, count);
766 } else {
767 u16 *q = p;
768 int cnt = count;
769 u16 a;
770
771 if (!vc->vc_can_do_color) {
772 while (cnt--) {
773 a = scr_readw(q);
774 a ^= 0x0800;
775 scr_writew(a, q);
776 q++;
777 }
778 } else if (vc->vc_hi_font_mask == 0x100) {
779 while (cnt--) {
780 a = scr_readw(q);
781 a = (a & 0x11ff) |
782 ((a & 0xe000) >> 4) |
783 ((a & 0x0e00) << 4);
784 scr_writew(a, q);
785 q++;
786 }
787 } else {
788 while (cnt--) {
789 a = scr_readw(q);
790 a = (a & 0x88ff) |
791 ((a & 0x7000) >> 4) |
792 ((a & 0x0700) << 4);
793 scr_writew(a, q);
794 q++;
795 }
796 }
797 }
798
799 if (con_should_update(vc))
800 do_update_region(vc, (unsigned long) p, count);
801 notify_update(vc);
802}
803
804/* used by selection: complement pointer position */
805void complement_pos(struct vc_data *vc, int offset)
806{
807 static int old_offset = -1;
808 static unsigned short old;
809 static unsigned short oldx, oldy;
810
811 WARN_CONSOLE_UNLOCKED();
812
813 if (old_offset != -1 && old_offset >= 0 &&
814 old_offset < vc->vc_screenbuf_size) {
815 scr_writew(old, screenpos(vc, old_offset, true));
816 if (con_should_update(vc))
817 vc->vc_sw->con_putc(vc, old, oldy, oldx);
818 notify_update(vc);
819 }
820
821 old_offset = offset;
822
823 if (offset != -1 && offset >= 0 &&
824 offset < vc->vc_screenbuf_size) {
825 unsigned short new;
826 unsigned short *p;
827 p = screenpos(vc, offset, true);
828 old = scr_readw(p);
829 new = old ^ vc->vc_complement_mask;
830 scr_writew(new, p);
831 if (con_should_update(vc)) {
832 oldx = (offset >> 1) % vc->vc_cols;
833 oldy = (offset >> 1) / vc->vc_cols;
834 vc->vc_sw->con_putc(vc, new, oldy, oldx);
835 }
836 notify_update(vc);
837 }
838}
839
840static void insert_char(struct vc_data *vc, unsigned int nr)
841{
842 unsigned short *p = (unsigned short *) vc->vc_pos;
843
844 vc_uniscr_insert(vc, nr);
845 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
846 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
847 vc->vc_need_wrap = 0;
848 if (con_should_update(vc))
849 do_update_region(vc, (unsigned long) p,
850 vc->vc_cols - vc->state.x);
851}
852
853static void delete_char(struct vc_data *vc, unsigned int nr)
854{
855 unsigned short *p = (unsigned short *) vc->vc_pos;
856
857 vc_uniscr_delete(vc, nr);
858 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
859 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
860 nr * 2);
861 vc->vc_need_wrap = 0;
862 if (con_should_update(vc))
863 do_update_region(vc, (unsigned long) p,
864 vc->vc_cols - vc->state.x);
865}
866
867static int softcursor_original = -1;
868
869static void add_softcursor(struct vc_data *vc)
870{
871 int i = scr_readw((u16 *) vc->vc_pos);
872 u32 type = vc->vc_cursor_type;
873
874 if (!(type & CUR_SW))
875 return;
876 if (softcursor_original != -1)
877 return;
878 softcursor_original = i;
879 i |= CUR_SET(type);
880 i ^= CUR_CHANGE(type);
881 if ((type & CUR_ALWAYS_BG) &&
882 (softcursor_original & CUR_BG) == (i & CUR_BG))
883 i ^= CUR_BG;
884 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
885 i ^= CUR_FG;
886 scr_writew(i, (u16 *)vc->vc_pos);
887 if (con_should_update(vc))
888 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
889}
890
891static void hide_softcursor(struct vc_data *vc)
892{
893 if (softcursor_original != -1) {
894 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
895 if (con_should_update(vc))
896 vc->vc_sw->con_putc(vc, softcursor_original,
897 vc->state.y, vc->state.x);
898 softcursor_original = -1;
899 }
900}
901
902static void hide_cursor(struct vc_data *vc)
903{
904 if (vc_is_sel(vc))
905 clear_selection();
906
907 vc->vc_sw->con_cursor(vc, CM_ERASE);
908 hide_softcursor(vc);
909}
910
911static void set_cursor(struct vc_data *vc)
912{
913 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
914 return;
915 if (vc->vc_deccm) {
916 if (vc_is_sel(vc))
917 clear_selection();
918 add_softcursor(vc);
919 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
920 vc->vc_sw->con_cursor(vc, CM_DRAW);
921 } else
922 hide_cursor(vc);
923}
924
925static void set_origin(struct vc_data *vc)
926{
927 WARN_CONSOLE_UNLOCKED();
928
929 if (!con_is_visible(vc) ||
930 !vc->vc_sw->con_set_origin ||
931 !vc->vc_sw->con_set_origin(vc))
932 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
933 vc->vc_visible_origin = vc->vc_origin;
934 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
935 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
936 2 * vc->state.x;
937}
938
939static void save_screen(struct vc_data *vc)
940{
941 WARN_CONSOLE_UNLOCKED();
942
943 if (vc->vc_sw->con_save_screen)
944 vc->vc_sw->con_save_screen(vc);
945}
946
947static void flush_scrollback(struct vc_data *vc)
948{
949 WARN_CONSOLE_UNLOCKED();
950
951 set_origin(vc);
952 if (vc->vc_sw->con_flush_scrollback) {
953 vc->vc_sw->con_flush_scrollback(vc);
954 } else if (con_is_visible(vc)) {
955 /*
956 * When no con_flush_scrollback method is provided then the
957 * legacy way for flushing the scrollback buffer is to use
958 * a side effect of the con_switch method. We do it only on
959 * the foreground console as background consoles have no
960 * scrollback buffers in that case and we obviously don't
961 * want to switch to them.
962 */
963 hide_cursor(vc);
964 vc->vc_sw->con_switch(vc);
965 set_cursor(vc);
966 }
967}
968
969/*
970 * Redrawing of screen
971 */
972
973void clear_buffer_attributes(struct vc_data *vc)
974{
975 unsigned short *p = (unsigned short *)vc->vc_origin;
976 int count = vc->vc_screenbuf_size / 2;
977 int mask = vc->vc_hi_font_mask | 0xff;
978
979 for (; count > 0; count--, p++) {
980 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
981 }
982}
983
984void redraw_screen(struct vc_data *vc, int is_switch)
985{
986 int redraw = 0;
987
988 WARN_CONSOLE_UNLOCKED();
989
990 if (!vc) {
991 /* strange ... */
992 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
993 return;
994 }
995
996 if (is_switch) {
997 struct vc_data *old_vc = vc_cons[fg_console].d;
998 if (old_vc == vc)
999 return;
1000 if (!con_is_visible(vc))
1001 redraw = 1;
1002 *vc->vc_display_fg = vc;
1003 fg_console = vc->vc_num;
1004 hide_cursor(old_vc);
1005 if (!con_is_visible(old_vc)) {
1006 save_screen(old_vc);
1007 set_origin(old_vc);
1008 }
1009 if (tty0dev)
1010 sysfs_notify(&tty0dev->kobj, NULL, "active");
1011 } else {
1012 hide_cursor(vc);
1013 redraw = 1;
1014 }
1015
1016 if (redraw) {
1017 int update;
1018 int old_was_color = vc->vc_can_do_color;
1019
1020 set_origin(vc);
1021 update = vc->vc_sw->con_switch(vc);
1022 set_palette(vc);
1023 /*
1024 * If console changed from mono<->color, the best we can do
1025 * is to clear the buffer attributes. As it currently stands,
1026 * rebuilding new attributes from the old buffer is not doable
1027 * without overly complex code.
1028 */
1029 if (old_was_color != vc->vc_can_do_color) {
1030 update_attr(vc);
1031 clear_buffer_attributes(vc);
1032 }
1033
1034 if (update && vc->vc_mode != KD_GRAPHICS)
1035 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1036 }
1037 set_cursor(vc);
1038 if (is_switch) {
1039 vt_set_leds_compute_shiftstate();
1040 notify_update(vc);
1041 }
1042}
1043
1044/*
1045 * Allocation, freeing and resizing of VTs.
1046 */
1047
1048int vc_cons_allocated(unsigned int i)
1049{
1050 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1051}
1052
1053static void visual_init(struct vc_data *vc, int num, int init)
1054{
1055 /* ++Geert: vc->vc_sw->con_init determines console size */
1056 if (vc->vc_sw)
1057 module_put(vc->vc_sw->owner);
1058 vc->vc_sw = conswitchp;
1059#ifndef VT_SINGLE_DRIVER
1060 if (con_driver_map[num])
1061 vc->vc_sw = con_driver_map[num];
1062#endif
1063 __module_get(vc->vc_sw->owner);
1064 vc->vc_num = num;
1065 vc->vc_display_fg = &master_display_fg;
1066 if (vc->uni_pagedict_loc)
1067 con_free_unimap(vc);
1068 vc->uni_pagedict_loc = &vc->uni_pagedict;
1069 vc->uni_pagedict = NULL;
1070 vc->vc_hi_font_mask = 0;
1071 vc->vc_complement_mask = 0;
1072 vc->vc_can_do_color = 0;
1073 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1074 vc->vc_sw->con_init(vc, init);
1075 if (!vc->vc_complement_mask)
1076 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077 vc->vc_s_complement_mask = vc->vc_complement_mask;
1078 vc->vc_size_row = vc->vc_cols << 1;
1079 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1080}
1081
1082
1083static void visual_deinit(struct vc_data *vc)
1084{
1085 vc->vc_sw->con_deinit(vc);
1086 module_put(vc->vc_sw->owner);
1087}
1088
1089static void vc_port_destruct(struct tty_port *port)
1090{
1091 struct vc_data *vc = container_of(port, struct vc_data, port);
1092
1093 kfree(vc);
1094}
1095
1096static const struct tty_port_operations vc_port_ops = {
1097 .destruct = vc_port_destruct,
1098};
1099
1100/*
1101 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1102 * [this is to be used together with some user program
1103 * like resize that changes the hardware videomode]
1104 */
1105#define VC_MAXCOL (32767)
1106#define VC_MAXROW (32767)
1107
1108int vc_allocate(unsigned int currcons) /* return 0 on success */
1109{
1110 struct vt_notifier_param param;
1111 struct vc_data *vc;
1112 int err;
1113
1114 WARN_CONSOLE_UNLOCKED();
1115
1116 if (currcons >= MAX_NR_CONSOLES)
1117 return -ENXIO;
1118
1119 if (vc_cons[currcons].d)
1120 return 0;
1121
1122 /* due to the granularity of kmalloc, we waste some memory here */
1123 /* the alloc is done in two steps, to optimize the common situation
1124 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1125 /* although the numbers above are not valid since long ago, the
1126 point is still up-to-date and the comment still has its value
1127 even if only as a historical artifact. --mj, July 1998 */
1128 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1129 if (!vc)
1130 return -ENOMEM;
1131
1132 vc_cons[currcons].d = vc;
1133 tty_port_init(&vc->port);
1134 vc->port.ops = &vc_port_ops;
1135 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1136
1137 visual_init(vc, currcons, 1);
1138
1139 if (!*vc->uni_pagedict_loc)
1140 con_set_default_unimap(vc);
1141
1142 err = -EINVAL;
1143 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1144 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1145 goto err_free;
1146 err = -ENOMEM;
1147 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1148 if (!vc->vc_screenbuf)
1149 goto err_free;
1150
1151 /* If no drivers have overridden us and the user didn't pass a
1152 boot option, default to displaying the cursor */
1153 if (global_cursor_default == -1)
1154 global_cursor_default = 1;
1155
1156 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1157 vcs_make_sysfs(currcons);
1158 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
1159
1160 return 0;
1161err_free:
1162 visual_deinit(vc);
1163 kfree(vc);
1164 vc_cons[currcons].d = NULL;
1165 return err;
1166}
1167
1168static inline int resize_screen(struct vc_data *vc, int width, int height,
1169 int user)
1170{
1171 /* Resizes the resolution of the display adapater */
1172 int err = 0;
1173
1174 if (vc->vc_sw->con_resize)
1175 err = vc->vc_sw->con_resize(vc, width, height, user);
1176
1177 return err;
1178}
1179
1180/**
1181 * vc_do_resize - resizing method for the tty
1182 * @tty: tty being resized
1183 * @vc: virtual console private data
1184 * @cols: columns
1185 * @lines: lines
1186 *
1187 * Resize a virtual console, clipping according to the actual constraints.
1188 * If the caller passes a tty structure then update the termios winsize
1189 * information and perform any necessary signal handling.
1190 *
1191 * Caller must hold the console semaphore. Takes the termios rwsem and
1192 * ctrl.lock of the tty IFF a tty is passed.
1193 */
1194
1195static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1196 unsigned int cols, unsigned int lines)
1197{
1198 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1199 unsigned long end;
1200 unsigned int old_rows, old_row_size, first_copied_row;
1201 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1202 unsigned int user;
1203 unsigned short *oldscreen, *newscreen;
1204 struct uni_screen *new_uniscr = NULL;
1205
1206 WARN_CONSOLE_UNLOCKED();
1207
1208 if (!vc)
1209 return -ENXIO;
1210
1211 user = vc->vc_resize_user;
1212 vc->vc_resize_user = 0;
1213
1214 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1215 return -EINVAL;
1216
1217 new_cols = (cols ? cols : vc->vc_cols);
1218 new_rows = (lines ? lines : vc->vc_rows);
1219 new_row_size = new_cols << 1;
1220 new_screen_size = new_row_size * new_rows;
1221
1222 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1223 /*
1224 * This function is being called here to cover the case
1225 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1226 * passing the same fb_var_screeninfo containing the fields
1227 * yres/xres equal to a number non-multiple of vc_font.height
1228 * and yres_virtual/xres_virtual equal to number lesser than the
1229 * vc_font.height and yres/xres.
1230 * In the second call, the struct fb_var_screeninfo isn't
1231 * being modified by the underlying driver because of the
1232 * if above, and this causes the fbcon_display->vrows to become
1233 * negative and it eventually leads to out-of-bound
1234 * access by the imageblit function.
1235 * To give the correct values to the struct and to not have
1236 * to deal with possible errors from the code below, we call
1237 * the resize_screen here as well.
1238 */
1239 return resize_screen(vc, new_cols, new_rows, user);
1240 }
1241
1242 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1243 return -EINVAL;
1244 newscreen = kzalloc(new_screen_size, GFP_USER);
1245 if (!newscreen)
1246 return -ENOMEM;
1247
1248 if (get_vc_uniscr(vc)) {
1249 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1250 if (!new_uniscr) {
1251 kfree(newscreen);
1252 return -ENOMEM;
1253 }
1254 }
1255
1256 if (vc_is_sel(vc))
1257 clear_selection();
1258
1259 old_rows = vc->vc_rows;
1260 old_row_size = vc->vc_size_row;
1261
1262 err = resize_screen(vc, new_cols, new_rows, user);
1263 if (err) {
1264 kfree(newscreen);
1265 vc_uniscr_free(new_uniscr);
1266 return err;
1267 }
1268
1269 vc->vc_rows = new_rows;
1270 vc->vc_cols = new_cols;
1271 vc->vc_size_row = new_row_size;
1272 vc->vc_screenbuf_size = new_screen_size;
1273
1274 rlth = min(old_row_size, new_row_size);
1275 rrem = new_row_size - rlth;
1276 old_origin = vc->vc_origin;
1277 new_origin = (long) newscreen;
1278 new_scr_end = new_origin + new_screen_size;
1279
1280 if (vc->state.y > new_rows) {
1281 if (old_rows - vc->state.y < new_rows) {
1282 /*
1283 * Cursor near the bottom, copy contents from the
1284 * bottom of buffer
1285 */
1286 first_copied_row = (old_rows - new_rows);
1287 } else {
1288 /*
1289 * Cursor is in no man's land, copy 1/2 screenful
1290 * from the top and bottom of cursor position
1291 */
1292 first_copied_row = (vc->state.y - new_rows/2);
1293 }
1294 old_origin += first_copied_row * old_row_size;
1295 } else
1296 first_copied_row = 0;
1297 end = old_origin + old_row_size * min(old_rows, new_rows);
1298
1299 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1300 get_vc_uniscr(vc), rlth/2, first_copied_row,
1301 min(old_rows, new_rows));
1302 vc_uniscr_set(vc, new_uniscr);
1303
1304 update_attr(vc);
1305
1306 while (old_origin < end) {
1307 scr_memcpyw((unsigned short *) new_origin,
1308 (unsigned short *) old_origin, rlth);
1309 if (rrem)
1310 scr_memsetw((void *)(new_origin + rlth),
1311 vc->vc_video_erase_char, rrem);
1312 old_origin += old_row_size;
1313 new_origin += new_row_size;
1314 }
1315 if (new_scr_end > new_origin)
1316 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1317 new_scr_end - new_origin);
1318 oldscreen = vc->vc_screenbuf;
1319 vc->vc_screenbuf = newscreen;
1320 vc->vc_screenbuf_size = new_screen_size;
1321 set_origin(vc);
1322 kfree(oldscreen);
1323
1324 /* do part of a reset_terminal() */
1325 vc->vc_top = 0;
1326 vc->vc_bottom = vc->vc_rows;
1327 gotoxy(vc, vc->state.x, vc->state.y);
1328 save_cur(vc);
1329
1330 if (tty) {
1331 /* Rewrite the requested winsize data with the actual
1332 resulting sizes */
1333 struct winsize ws;
1334 memset(&ws, 0, sizeof(ws));
1335 ws.ws_row = vc->vc_rows;
1336 ws.ws_col = vc->vc_cols;
1337 ws.ws_ypixel = vc->vc_scan_lines;
1338 tty_do_resize(tty, &ws);
1339 }
1340
1341 if (con_is_visible(vc))
1342 update_screen(vc);
1343 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1344 notify_update(vc);
1345 return err;
1346}
1347
1348/**
1349 * vc_resize - resize a VT
1350 * @vc: virtual console
1351 * @cols: columns
1352 * @rows: rows
1353 *
1354 * Resize a virtual console as seen from the console end of things. We
1355 * use the common vc_do_resize methods to update the structures. The
1356 * caller must hold the console sem to protect console internals and
1357 * vc->port.tty
1358 */
1359
1360int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1361{
1362 return vc_do_resize(vc->port.tty, vc, cols, rows);
1363}
1364
1365/**
1366 * vt_resize - resize a VT
1367 * @tty: tty to resize
1368 * @ws: winsize attributes
1369 *
1370 * Resize a virtual terminal. This is called by the tty layer as we
1371 * register our own handler for resizing. The mutual helper does all
1372 * the actual work.
1373 *
1374 * Takes the console sem and the called methods then take the tty
1375 * termios_rwsem and the tty ctrl.lock in that order.
1376 */
1377static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1378{
1379 struct vc_data *vc = tty->driver_data;
1380 int ret;
1381
1382 console_lock();
1383 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1384 console_unlock();
1385 return ret;
1386}
1387
1388struct vc_data *vc_deallocate(unsigned int currcons)
1389{
1390 struct vc_data *vc = NULL;
1391
1392 WARN_CONSOLE_UNLOCKED();
1393
1394 if (vc_cons_allocated(currcons)) {
1395 struct vt_notifier_param param;
1396
1397 param.vc = vc = vc_cons[currcons].d;
1398 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1399 vcs_remove_sysfs(currcons);
1400 visual_deinit(vc);
1401 con_free_unimap(vc);
1402 put_pid(vc->vt_pid);
1403 vc_uniscr_set(vc, NULL);
1404 kfree(vc->vc_screenbuf);
1405 vc_cons[currcons].d = NULL;
1406 }
1407 return vc;
1408}
1409
1410/*
1411 * VT102 emulator
1412 */
1413
1414enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1415
1416#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1417#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1418#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1419
1420#define decarm VC_REPEAT
1421#define decckm VC_CKMODE
1422#define kbdapplic VC_APPLIC
1423#define lnm VC_CRLF
1424
1425const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1426 8,12,10,14, 9,13,11,15 };
1427
1428/* the default colour table, for VGA+ colour systems */
1429unsigned char default_red[] = {
1430 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1431 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1432};
1433module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1434
1435unsigned char default_grn[] = {
1436 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1437 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1438};
1439module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1440
1441unsigned char default_blu[] = {
1442 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1443 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1444};
1445module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1446
1447/*
1448 * gotoxy() must verify all boundaries, because the arguments
1449 * might also be negative. If the given position is out of
1450 * bounds, the cursor is placed at the nearest margin.
1451 */
1452static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1453{
1454 int min_y, max_y;
1455
1456 if (new_x < 0)
1457 vc->state.x = 0;
1458 else {
1459 if (new_x >= vc->vc_cols)
1460 vc->state.x = vc->vc_cols - 1;
1461 else
1462 vc->state.x = new_x;
1463 }
1464
1465 if (vc->vc_decom) {
1466 min_y = vc->vc_top;
1467 max_y = vc->vc_bottom;
1468 } else {
1469 min_y = 0;
1470 max_y = vc->vc_rows;
1471 }
1472 if (new_y < min_y)
1473 vc->state.y = min_y;
1474 else if (new_y >= max_y)
1475 vc->state.y = max_y - 1;
1476 else
1477 vc->state.y = new_y;
1478 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1479 (vc->state.x << 1);
1480 vc->vc_need_wrap = 0;
1481}
1482
1483/* for absolute user moves, when decom is set */
1484static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1485{
1486 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1487}
1488
1489void scrollback(struct vc_data *vc)
1490{
1491 scrolldelta(-(vc->vc_rows / 2));
1492}
1493
1494void scrollfront(struct vc_data *vc, int lines)
1495{
1496 if (!lines)
1497 lines = vc->vc_rows / 2;
1498 scrolldelta(lines);
1499}
1500
1501static void lf(struct vc_data *vc)
1502{
1503 /* don't scroll if above bottom of scrolling region, or
1504 * if below scrolling region
1505 */
1506 if (vc->state.y + 1 == vc->vc_bottom)
1507 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1508 else if (vc->state.y < vc->vc_rows - 1) {
1509 vc->state.y++;
1510 vc->vc_pos += vc->vc_size_row;
1511 }
1512 vc->vc_need_wrap = 0;
1513 notify_write(vc, '\n');
1514}
1515
1516static void ri(struct vc_data *vc)
1517{
1518 /* don't scroll if below top of scrolling region, or
1519 * if above scrolling region
1520 */
1521 if (vc->state.y == vc->vc_top)
1522 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1523 else if (vc->state.y > 0) {
1524 vc->state.y--;
1525 vc->vc_pos -= vc->vc_size_row;
1526 }
1527 vc->vc_need_wrap = 0;
1528}
1529
1530static inline void cr(struct vc_data *vc)
1531{
1532 vc->vc_pos -= vc->state.x << 1;
1533 vc->vc_need_wrap = vc->state.x = 0;
1534 notify_write(vc, '\r');
1535}
1536
1537static inline void bs(struct vc_data *vc)
1538{
1539 if (vc->state.x) {
1540 vc->vc_pos -= 2;
1541 vc->state.x--;
1542 vc->vc_need_wrap = 0;
1543 notify_write(vc, '\b');
1544 }
1545}
1546
1547static inline void del(struct vc_data *vc)
1548{
1549 /* ignored */
1550}
1551
1552static void csi_J(struct vc_data *vc, int vpar)
1553{
1554 unsigned int count;
1555 unsigned short * start;
1556
1557 switch (vpar) {
1558 case 0: /* erase from cursor to end of display */
1559 vc_uniscr_clear_line(vc, vc->state.x,
1560 vc->vc_cols - vc->state.x);
1561 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1562 vc->vc_rows - vc->state.y - 1);
1563 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1564 start = (unsigned short *)vc->vc_pos;
1565 break;
1566 case 1: /* erase from start to cursor */
1567 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1568 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1569 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1570 start = (unsigned short *)vc->vc_origin;
1571 break;
1572 case 3: /* include scrollback */
1573 flush_scrollback(vc);
1574 fallthrough;
1575 case 2: /* erase whole display */
1576 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1577 count = vc->vc_cols * vc->vc_rows;
1578 start = (unsigned short *)vc->vc_origin;
1579 break;
1580 default:
1581 return;
1582 }
1583 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1584 if (con_should_update(vc))
1585 do_update_region(vc, (unsigned long) start, count);
1586 vc->vc_need_wrap = 0;
1587}
1588
1589static void csi_K(struct vc_data *vc, int vpar)
1590{
1591 unsigned int count;
1592 unsigned short *start = (unsigned short *)vc->vc_pos;
1593 int offset;
1594
1595 switch (vpar) {
1596 case 0: /* erase from cursor to end of line */
1597 offset = 0;
1598 count = vc->vc_cols - vc->state.x;
1599 break;
1600 case 1: /* erase from start of line to cursor */
1601 offset = -vc->state.x;
1602 count = vc->state.x + 1;
1603 break;
1604 case 2: /* erase whole line */
1605 offset = -vc->state.x;
1606 count = vc->vc_cols;
1607 break;
1608 default:
1609 return;
1610 }
1611 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1612 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1613 vc->vc_need_wrap = 0;
1614 if (con_should_update(vc))
1615 do_update_region(vc, (unsigned long)(start + offset), count);
1616}
1617
1618/* erase the following vpar positions */
1619static void csi_X(struct vc_data *vc, unsigned int vpar)
1620{ /* not vt100? */
1621 unsigned int count;
1622
1623 if (!vpar)
1624 vpar++;
1625
1626 count = min(vpar, vc->vc_cols - vc->state.x);
1627
1628 vc_uniscr_clear_line(vc, vc->state.x, count);
1629 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1630 if (con_should_update(vc))
1631 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1632 vc->vc_need_wrap = 0;
1633}
1634
1635static void default_attr(struct vc_data *vc)
1636{
1637 vc->state.intensity = VCI_NORMAL;
1638 vc->state.italic = false;
1639 vc->state.underline = false;
1640 vc->state.reverse = false;
1641 vc->state.blink = false;
1642 vc->state.color = vc->vc_def_color;
1643}
1644
1645struct rgb { u8 r; u8 g; u8 b; };
1646
1647static void rgb_from_256(int i, struct rgb *c)
1648{
1649 if (i < 8) { /* Standard colours. */
1650 c->r = i&1 ? 0xaa : 0x00;
1651 c->g = i&2 ? 0xaa : 0x00;
1652 c->b = i&4 ? 0xaa : 0x00;
1653 } else if (i < 16) {
1654 c->r = i&1 ? 0xff : 0x55;
1655 c->g = i&2 ? 0xff : 0x55;
1656 c->b = i&4 ? 0xff : 0x55;
1657 } else if (i < 232) { /* 6x6x6 colour cube. */
1658 c->r = (i - 16) / 36 * 85 / 2;
1659 c->g = (i - 16) / 6 % 6 * 85 / 2;
1660 c->b = (i - 16) % 6 * 85 / 2;
1661 } else /* Grayscale ramp. */
1662 c->r = c->g = c->b = i * 10 - 2312;
1663}
1664
1665static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1666{
1667 u8 hue = 0, max = max3(c->r, c->g, c->b);
1668
1669 if (c->r > max / 2)
1670 hue |= 4;
1671 if (c->g > max / 2)
1672 hue |= 2;
1673 if (c->b > max / 2)
1674 hue |= 1;
1675
1676 if (hue == 7 && max <= 0x55) {
1677 hue = 0;
1678 vc->state.intensity = VCI_BOLD;
1679 } else if (max > 0xaa)
1680 vc->state.intensity = VCI_BOLD;
1681 else
1682 vc->state.intensity = VCI_NORMAL;
1683
1684 vc->state.color = (vc->state.color & 0xf0) | hue;
1685}
1686
1687static void rgb_background(struct vc_data *vc, const struct rgb *c)
1688{
1689 /* For backgrounds, err on the dark side. */
1690 vc->state.color = (vc->state.color & 0x0f)
1691 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1692}
1693
1694/*
1695 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1696 * and thus need to be detected and ignored by hand. That standard also
1697 * wants : rather than ; as separators but sequences containing : are currently
1698 * completely ignored by the parser.
1699 *
1700 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1701 * supporting them.
1702 */
1703static int vc_t416_color(struct vc_data *vc, int i,
1704 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1705{
1706 struct rgb c;
1707
1708 i++;
1709 if (i > vc->vc_npar)
1710 return i;
1711
1712 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1713 /* 256 colours */
1714 i++;
1715 rgb_from_256(vc->vc_par[i], &c);
1716 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1717 /* 24 bit */
1718 c.r = vc->vc_par[i + 1];
1719 c.g = vc->vc_par[i + 2];
1720 c.b = vc->vc_par[i + 3];
1721 i += 3;
1722 } else
1723 return i;
1724
1725 set_color(vc, &c);
1726
1727 return i;
1728}
1729
1730/* console_lock is held */
1731static void csi_m(struct vc_data *vc)
1732{
1733 int i;
1734
1735 for (i = 0; i <= vc->vc_npar; i++)
1736 switch (vc->vc_par[i]) {
1737 case 0: /* all attributes off */
1738 default_attr(vc);
1739 break;
1740 case 1:
1741 vc->state.intensity = VCI_BOLD;
1742 break;
1743 case 2:
1744 vc->state.intensity = VCI_HALF_BRIGHT;
1745 break;
1746 case 3:
1747 vc->state.italic = true;
1748 break;
1749 case 21:
1750 /*
1751 * No console drivers support double underline, so
1752 * convert it to a single underline.
1753 */
1754 case 4:
1755 vc->state.underline = true;
1756 break;
1757 case 5:
1758 vc->state.blink = true;
1759 break;
1760 case 7:
1761 vc->state.reverse = true;
1762 break;
1763 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1764 * Select primary font, don't display control chars if
1765 * defined, don't set bit 8 on output.
1766 */
1767 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1768 vc->vc_disp_ctrl = 0;
1769 vc->vc_toggle_meta = 0;
1770 break;
1771 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1772 * Select first alternate font, lets chars < 32 be
1773 * displayed as ROM chars.
1774 */
1775 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1776 vc->vc_disp_ctrl = 1;
1777 vc->vc_toggle_meta = 0;
1778 break;
1779 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1780 * Select second alternate font, toggle high bit
1781 * before displaying as ROM char.
1782 */
1783 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1784 vc->vc_disp_ctrl = 1;
1785 vc->vc_toggle_meta = 1;
1786 break;
1787 case 22:
1788 vc->state.intensity = VCI_NORMAL;
1789 break;
1790 case 23:
1791 vc->state.italic = false;
1792 break;
1793 case 24:
1794 vc->state.underline = false;
1795 break;
1796 case 25:
1797 vc->state.blink = false;
1798 break;
1799 case 27:
1800 vc->state.reverse = false;
1801 break;
1802 case 38:
1803 i = vc_t416_color(vc, i, rgb_foreground);
1804 break;
1805 case 48:
1806 i = vc_t416_color(vc, i, rgb_background);
1807 break;
1808 case 39:
1809 vc->state.color = (vc->vc_def_color & 0x0f) |
1810 (vc->state.color & 0xf0);
1811 break;
1812 case 49:
1813 vc->state.color = (vc->vc_def_color & 0xf0) |
1814 (vc->state.color & 0x0f);
1815 break;
1816 default:
1817 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1818 if (vc->vc_par[i] < 100)
1819 vc->state.intensity = VCI_BOLD;
1820 vc->vc_par[i] -= 60;
1821 }
1822 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1823 vc->state.color = color_table[vc->vc_par[i] - 30]
1824 | (vc->state.color & 0xf0);
1825 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1826 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1827 | (vc->state.color & 0x0f);
1828 break;
1829 }
1830 update_attr(vc);
1831}
1832
1833static void respond_string(const char *p, size_t len, struct tty_port *port)
1834{
1835 tty_insert_flip_string(port, p, len);
1836 tty_flip_buffer_push(port);
1837}
1838
1839static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1840{
1841 char buf[40];
1842 int len;
1843
1844 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1845 (vc->vc_decom ? vc->vc_top + 1 : 1),
1846 vc->state.x + 1);
1847 respond_string(buf, len, tty->port);
1848}
1849
1850static inline void status_report(struct tty_struct *tty)
1851{
1852 static const char teminal_ok[] = "\033[0n";
1853
1854 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1855}
1856
1857static inline void respond_ID(struct tty_struct *tty)
1858{
1859 /* terminal answer to an ESC-Z or csi0c query. */
1860 static const char vt102_id[] = "\033[?6c";
1861
1862 respond_string(vt102_id, strlen(vt102_id), tty->port);
1863}
1864
1865void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1866{
1867 char buf[8];
1868 int len;
1869
1870 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1871 (char)('!' + mrx), (char)('!' + mry));
1872 respond_string(buf, len, tty->port);
1873}
1874
1875/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1876int mouse_reporting(void)
1877{
1878 return vc_cons[fg_console].d->vc_report_mouse;
1879}
1880
1881/* console_lock is held */
1882static void set_mode(struct vc_data *vc, int on_off)
1883{
1884 int i;
1885
1886 for (i = 0; i <= vc->vc_npar; i++)
1887 if (vc->vc_priv == EPdec) {
1888 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1889 case 1: /* Cursor keys send ^[Ox/^[[x */
1890 if (on_off)
1891 set_kbd(vc, decckm);
1892 else
1893 clr_kbd(vc, decckm);
1894 break;
1895 case 3: /* 80/132 mode switch unimplemented */
1896#if 0
1897 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1898 /* this alone does not suffice; some user mode
1899 utility has to change the hardware regs */
1900#endif
1901 break;
1902 case 5: /* Inverted screen on/off */
1903 if (vc->vc_decscnm != on_off) {
1904 vc->vc_decscnm = on_off;
1905 invert_screen(vc, 0,
1906 vc->vc_screenbuf_size,
1907 false);
1908 update_attr(vc);
1909 }
1910 break;
1911 case 6: /* Origin relative/absolute */
1912 vc->vc_decom = on_off;
1913 gotoxay(vc, 0, 0);
1914 break;
1915 case 7: /* Autowrap on/off */
1916 vc->vc_decawm = on_off;
1917 break;
1918 case 8: /* Autorepeat on/off */
1919 if (on_off)
1920 set_kbd(vc, decarm);
1921 else
1922 clr_kbd(vc, decarm);
1923 break;
1924 case 9:
1925 vc->vc_report_mouse = on_off ? 1 : 0;
1926 break;
1927 case 25: /* Cursor on/off */
1928 vc->vc_deccm = on_off;
1929 break;
1930 case 1000:
1931 vc->vc_report_mouse = on_off ? 2 : 0;
1932 break;
1933 }
1934 } else {
1935 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1936 case 3: /* Monitor (display ctrls) */
1937 vc->vc_disp_ctrl = on_off;
1938 break;
1939 case 4: /* Insert Mode on/off */
1940 vc->vc_decim = on_off;
1941 break;
1942 case 20: /* Lf, Enter == CrLf/Lf */
1943 if (on_off)
1944 set_kbd(vc, lnm);
1945 else
1946 clr_kbd(vc, lnm);
1947 break;
1948 }
1949 }
1950}
1951
1952/* console_lock is held */
1953static void setterm_command(struct vc_data *vc)
1954{
1955 switch (vc->vc_par[0]) {
1956 case 1: /* set color for underline mode */
1957 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1958 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1959 if (vc->state.underline)
1960 update_attr(vc);
1961 }
1962 break;
1963 case 2: /* set color for half intensity mode */
1964 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1965 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1966 if (vc->state.intensity == VCI_HALF_BRIGHT)
1967 update_attr(vc);
1968 }
1969 break;
1970 case 8: /* store colors as defaults */
1971 vc->vc_def_color = vc->vc_attr;
1972 if (vc->vc_hi_font_mask == 0x100)
1973 vc->vc_def_color >>= 1;
1974 default_attr(vc);
1975 update_attr(vc);
1976 break;
1977 case 9: /* set blanking interval */
1978 blankinterval = min(vc->vc_par[1], 60U) * 60;
1979 poke_blanked_console();
1980 break;
1981 case 10: /* set bell frequency in Hz */
1982 if (vc->vc_npar >= 1)
1983 vc->vc_bell_pitch = vc->vc_par[1];
1984 else
1985 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1986 break;
1987 case 11: /* set bell duration in msec */
1988 if (vc->vc_npar >= 1)
1989 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1990 msecs_to_jiffies(vc->vc_par[1]) : 0;
1991 else
1992 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1993 break;
1994 case 12: /* bring specified console to the front */
1995 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1996 set_console(vc->vc_par[1] - 1);
1997 break;
1998 case 13: /* unblank the screen */
1999 poke_blanked_console();
2000 break;
2001 case 14: /* set vesa powerdown interval */
2002 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2003 break;
2004 case 15: /* activate the previous console */
2005 set_console(last_console);
2006 break;
2007 case 16: /* set cursor blink duration in msec */
2008 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2009 vc->vc_par[1] <= USHRT_MAX)
2010 vc->vc_cur_blink_ms = vc->vc_par[1];
2011 else
2012 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2013 break;
2014 }
2015}
2016
2017/* console_lock is held */
2018static void csi_at(struct vc_data *vc, unsigned int nr)
2019{
2020 if (nr > vc->vc_cols - vc->state.x)
2021 nr = vc->vc_cols - vc->state.x;
2022 else if (!nr)
2023 nr = 1;
2024 insert_char(vc, nr);
2025}
2026
2027/* console_lock is held */
2028static void csi_L(struct vc_data *vc, unsigned int nr)
2029{
2030 if (nr > vc->vc_rows - vc->state.y)
2031 nr = vc->vc_rows - vc->state.y;
2032 else if (!nr)
2033 nr = 1;
2034 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2035 vc->vc_need_wrap = 0;
2036}
2037
2038/* console_lock is held */
2039static void csi_P(struct vc_data *vc, unsigned int nr)
2040{
2041 if (nr > vc->vc_cols - vc->state.x)
2042 nr = vc->vc_cols - vc->state.x;
2043 else if (!nr)
2044 nr = 1;
2045 delete_char(vc, nr);
2046}
2047
2048/* console_lock is held */
2049static void csi_M(struct vc_data *vc, unsigned int nr)
2050{
2051 if (nr > vc->vc_rows - vc->state.y)
2052 nr = vc->vc_rows - vc->state.y;
2053 else if (!nr)
2054 nr=1;
2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2056 vc->vc_need_wrap = 0;
2057}
2058
2059/* console_lock is held (except via vc_init->reset_terminal */
2060static void save_cur(struct vc_data *vc)
2061{
2062 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2063}
2064
2065/* console_lock is held */
2066static void restore_cur(struct vc_data *vc)
2067{
2068 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2069
2070 gotoxy(vc, vc->state.x, vc->state.y);
2071 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2072 vc);
2073 update_attr(vc);
2074 vc->vc_need_wrap = 0;
2075}
2076
2077enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2078 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2079 ESpalette, ESosc, ESapc, ESpm, ESdcs };
2080
2081/* console_lock is held (except via vc_init()) */
2082static void reset_terminal(struct vc_data *vc, int do_clear)
2083{
2084 unsigned int i;
2085
2086 vc->vc_top = 0;
2087 vc->vc_bottom = vc->vc_rows;
2088 vc->vc_state = ESnormal;
2089 vc->vc_priv = EPecma;
2090 vc->vc_translate = set_translate(LAT1_MAP, vc);
2091 vc->state.Gx_charset[0] = LAT1_MAP;
2092 vc->state.Gx_charset[1] = GRAF_MAP;
2093 vc->state.charset = 0;
2094 vc->vc_need_wrap = 0;
2095 vc->vc_report_mouse = 0;
2096 vc->vc_utf = default_utf8;
2097 vc->vc_utf_count = 0;
2098
2099 vc->vc_disp_ctrl = 0;
2100 vc->vc_toggle_meta = 0;
2101
2102 vc->vc_decscnm = 0;
2103 vc->vc_decom = 0;
2104 vc->vc_decawm = 1;
2105 vc->vc_deccm = global_cursor_default;
2106 vc->vc_decim = 0;
2107
2108 vt_reset_keyboard(vc->vc_num);
2109
2110 vc->vc_cursor_type = cur_default;
2111 vc->vc_complement_mask = vc->vc_s_complement_mask;
2112
2113 default_attr(vc);
2114 update_attr(vc);
2115
2116 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2117 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2118 set_bit(i, vc->vc_tab_stop);
2119
2120 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2121 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2122 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2123
2124 gotoxy(vc, 0, 0);
2125 save_cur(vc);
2126 if (do_clear)
2127 csi_J(vc, 2);
2128}
2129
2130static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2131{
2132 unsigned char *charset = &vc->state.Gx_charset[which];
2133
2134 switch (c) {
2135 case '0':
2136 *charset = GRAF_MAP;
2137 break;
2138 case 'B':
2139 *charset = LAT1_MAP;
2140 break;
2141 case 'U':
2142 *charset = IBMPC_MAP;
2143 break;
2144 case 'K':
2145 *charset = USER_MAP;
2146 break;
2147 }
2148
2149 if (vc->state.charset == which)
2150 vc->vc_translate = set_translate(*charset, vc);
2151}
2152
2153/* is this state an ANSI control string? */
2154static bool ansi_control_string(unsigned int state)
2155{
2156 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2157 return true;
2158 return false;
2159}
2160
2161/* console_lock is held */
2162static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2163{
2164 /*
2165 * Control characters can be used in the _middle_
2166 * of an escape sequence, aside from ANSI control strings.
2167 */
2168 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
2169 return;
2170 switch (c) {
2171 case 0:
2172 return;
2173 case 7:
2174 if (ansi_control_string(vc->vc_state))
2175 vc->vc_state = ESnormal;
2176 else if (vc->vc_bell_duration)
2177 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2178 return;
2179 case 8:
2180 bs(vc);
2181 return;
2182 case 9:
2183 vc->vc_pos -= (vc->state.x << 1);
2184
2185 vc->state.x = find_next_bit(vc->vc_tab_stop,
2186 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2187 vc->state.x + 1);
2188 if (vc->state.x >= VC_TABSTOPS_COUNT)
2189 vc->state.x = vc->vc_cols - 1;
2190
2191 vc->vc_pos += (vc->state.x << 1);
2192 notify_write(vc, '\t');
2193 return;
2194 case 10: case 11: case 12:
2195 lf(vc);
2196 if (!is_kbd(vc, lnm))
2197 return;
2198 fallthrough;
2199 case 13:
2200 cr(vc);
2201 return;
2202 case 14:
2203 vc->state.charset = 1;
2204 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2205 vc->vc_disp_ctrl = 1;
2206 return;
2207 case 15:
2208 vc->state.charset = 0;
2209 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2210 vc->vc_disp_ctrl = 0;
2211 return;
2212 case 24: case 26:
2213 vc->vc_state = ESnormal;
2214 return;
2215 case 27:
2216 vc->vc_state = ESesc;
2217 return;
2218 case 127:
2219 del(vc);
2220 return;
2221 case 128+27:
2222 vc->vc_state = ESsquare;
2223 return;
2224 }
2225 switch(vc->vc_state) {
2226 case ESesc:
2227 vc->vc_state = ESnormal;
2228 switch (c) {
2229 case '[':
2230 vc->vc_state = ESsquare;
2231 return;
2232 case ']':
2233 vc->vc_state = ESnonstd;
2234 return;
2235 case '_':
2236 vc->vc_state = ESapc;
2237 return;
2238 case '^':
2239 vc->vc_state = ESpm;
2240 return;
2241 case '%':
2242 vc->vc_state = ESpercent;
2243 return;
2244 case 'E':
2245 cr(vc);
2246 lf(vc);
2247 return;
2248 case 'M':
2249 ri(vc);
2250 return;
2251 case 'D':
2252 lf(vc);
2253 return;
2254 case 'H':
2255 if (vc->state.x < VC_TABSTOPS_COUNT)
2256 set_bit(vc->state.x, vc->vc_tab_stop);
2257 return;
2258 case 'P':
2259 vc->vc_state = ESdcs;
2260 return;
2261 case 'Z':
2262 respond_ID(tty);
2263 return;
2264 case '7':
2265 save_cur(vc);
2266 return;
2267 case '8':
2268 restore_cur(vc);
2269 return;
2270 case '(':
2271 vc->vc_state = ESsetG0;
2272 return;
2273 case ')':
2274 vc->vc_state = ESsetG1;
2275 return;
2276 case '#':
2277 vc->vc_state = EShash;
2278 return;
2279 case 'c':
2280 reset_terminal(vc, 1);
2281 return;
2282 case '>': /* Numeric keypad */
2283 clr_kbd(vc, kbdapplic);
2284 return;
2285 case '=': /* Appl. keypad */
2286 set_kbd(vc, kbdapplic);
2287 return;
2288 }
2289 return;
2290 case ESnonstd:
2291 if (c=='P') { /* palette escape sequence */
2292 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2293 vc->vc_par[vc->vc_npar] = 0;
2294 vc->vc_npar = 0;
2295 vc->vc_state = ESpalette;
2296 return;
2297 } else if (c=='R') { /* reset palette */
2298 reset_palette(vc);
2299 vc->vc_state = ESnormal;
2300 } else if (c>='0' && c<='9')
2301 vc->vc_state = ESosc;
2302 else
2303 vc->vc_state = ESnormal;
2304 return;
2305 case ESpalette:
2306 if (isxdigit(c)) {
2307 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2308 if (vc->vc_npar == 7) {
2309 int i = vc->vc_par[0] * 3, j = 1;
2310 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2311 vc->vc_palette[i++] += vc->vc_par[j++];
2312 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2313 vc->vc_palette[i++] += vc->vc_par[j++];
2314 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2315 vc->vc_palette[i] += vc->vc_par[j];
2316 set_palette(vc);
2317 vc->vc_state = ESnormal;
2318 }
2319 } else
2320 vc->vc_state = ESnormal;
2321 return;
2322 case ESsquare:
2323 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2324 vc->vc_par[vc->vc_npar] = 0;
2325 vc->vc_npar = 0;
2326 vc->vc_state = ESgetpars;
2327 if (c == '[') { /* Function key */
2328 vc->vc_state=ESfunckey;
2329 return;
2330 }
2331 switch (c) {
2332 case '?':
2333 vc->vc_priv = EPdec;
2334 return;
2335 case '>':
2336 vc->vc_priv = EPgt;
2337 return;
2338 case '=':
2339 vc->vc_priv = EPeq;
2340 return;
2341 case '<':
2342 vc->vc_priv = EPlt;
2343 return;
2344 }
2345 vc->vc_priv = EPecma;
2346 fallthrough;
2347 case ESgetpars:
2348 if (c == ';' && vc->vc_npar < NPAR - 1) {
2349 vc->vc_npar++;
2350 return;
2351 } else if (c>='0' && c<='9') {
2352 vc->vc_par[vc->vc_npar] *= 10;
2353 vc->vc_par[vc->vc_npar] += c - '0';
2354 return;
2355 }
2356 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2357 vc->vc_state = EScsiignore;
2358 return;
2359 }
2360 vc->vc_state = ESnormal;
2361 switch(c) {
2362 case 'h':
2363 if (vc->vc_priv <= EPdec)
2364 set_mode(vc, 1);
2365 return;
2366 case 'l':
2367 if (vc->vc_priv <= EPdec)
2368 set_mode(vc, 0);
2369 return;
2370 case 'c':
2371 if (vc->vc_priv == EPdec) {
2372 if (vc->vc_par[0])
2373 vc->vc_cursor_type =
2374 CUR_MAKE(vc->vc_par[0],
2375 vc->vc_par[1],
2376 vc->vc_par[2]);
2377 else
2378 vc->vc_cursor_type = cur_default;
2379 return;
2380 }
2381 break;
2382 case 'm':
2383 if (vc->vc_priv == EPdec) {
2384 clear_selection();
2385 if (vc->vc_par[0])
2386 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2387 else
2388 vc->vc_complement_mask = vc->vc_s_complement_mask;
2389 return;
2390 }
2391 break;
2392 case 'n':
2393 if (vc->vc_priv == EPecma) {
2394 if (vc->vc_par[0] == 5)
2395 status_report(tty);
2396 else if (vc->vc_par[0] == 6)
2397 cursor_report(vc, tty);
2398 }
2399 return;
2400 }
2401 if (vc->vc_priv != EPecma) {
2402 vc->vc_priv = EPecma;
2403 return;
2404 }
2405 switch(c) {
2406 case 'G': case '`':
2407 if (vc->vc_par[0])
2408 vc->vc_par[0]--;
2409 gotoxy(vc, vc->vc_par[0], vc->state.y);
2410 return;
2411 case 'A':
2412 if (!vc->vc_par[0])
2413 vc->vc_par[0]++;
2414 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2415 return;
2416 case 'B': case 'e':
2417 if (!vc->vc_par[0])
2418 vc->vc_par[0]++;
2419 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2420 return;
2421 case 'C': case 'a':
2422 if (!vc->vc_par[0])
2423 vc->vc_par[0]++;
2424 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2425 return;
2426 case 'D':
2427 if (!vc->vc_par[0])
2428 vc->vc_par[0]++;
2429 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2430 return;
2431 case 'E':
2432 if (!vc->vc_par[0])
2433 vc->vc_par[0]++;
2434 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2435 return;
2436 case 'F':
2437 if (!vc->vc_par[0])
2438 vc->vc_par[0]++;
2439 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2440 return;
2441 case 'd':
2442 if (vc->vc_par[0])
2443 vc->vc_par[0]--;
2444 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2445 return;
2446 case 'H': case 'f':
2447 if (vc->vc_par[0])
2448 vc->vc_par[0]--;
2449 if (vc->vc_par[1])
2450 vc->vc_par[1]--;
2451 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2452 return;
2453 case 'J':
2454 csi_J(vc, vc->vc_par[0]);
2455 return;
2456 case 'K':
2457 csi_K(vc, vc->vc_par[0]);
2458 return;
2459 case 'L':
2460 csi_L(vc, vc->vc_par[0]);
2461 return;
2462 case 'M':
2463 csi_M(vc, vc->vc_par[0]);
2464 return;
2465 case 'P':
2466 csi_P(vc, vc->vc_par[0]);
2467 return;
2468 case 'c':
2469 if (!vc->vc_par[0])
2470 respond_ID(tty);
2471 return;
2472 case 'g':
2473 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2474 set_bit(vc->state.x, vc->vc_tab_stop);
2475 else if (vc->vc_par[0] == 3)
2476 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2477 return;
2478 case 'm':
2479 csi_m(vc);
2480 return;
2481 case 'q': /* DECLL - but only 3 leds */
2482 /* map 0,1,2,3 to 0,1,2,4 */
2483 if (vc->vc_par[0] < 4)
2484 vt_set_led_state(vc->vc_num,
2485 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2486 return;
2487 case 'r':
2488 if (!vc->vc_par[0])
2489 vc->vc_par[0]++;
2490 if (!vc->vc_par[1])
2491 vc->vc_par[1] = vc->vc_rows;
2492 /* Minimum allowed region is 2 lines */
2493 if (vc->vc_par[0] < vc->vc_par[1] &&
2494 vc->vc_par[1] <= vc->vc_rows) {
2495 vc->vc_top = vc->vc_par[0] - 1;
2496 vc->vc_bottom = vc->vc_par[1];
2497 gotoxay(vc, 0, 0);
2498 }
2499 return;
2500 case 's':
2501 save_cur(vc);
2502 return;
2503 case 'u':
2504 restore_cur(vc);
2505 return;
2506 case 'X':
2507 csi_X(vc, vc->vc_par[0]);
2508 return;
2509 case '@':
2510 csi_at(vc, vc->vc_par[0]);
2511 return;
2512 case ']': /* setterm functions */
2513 setterm_command(vc);
2514 return;
2515 }
2516 return;
2517 case EScsiignore:
2518 if (c >= 20 && c <= 0x3f)
2519 return;
2520 vc->vc_state = ESnormal;
2521 return;
2522 case ESpercent:
2523 vc->vc_state = ESnormal;
2524 switch (c) {
2525 case '@': /* defined in ISO 2022 */
2526 vc->vc_utf = 0;
2527 return;
2528 case 'G': /* prelim official escape code */
2529 case '8': /* retained for compatibility */
2530 vc->vc_utf = 1;
2531 return;
2532 }
2533 return;
2534 case ESfunckey:
2535 vc->vc_state = ESnormal;
2536 return;
2537 case EShash:
2538 vc->vc_state = ESnormal;
2539 if (c == '8') {
2540 /* DEC screen alignment test. kludge :-) */
2541 vc->vc_video_erase_char =
2542 (vc->vc_video_erase_char & 0xff00) | 'E';
2543 csi_J(vc, 2);
2544 vc->vc_video_erase_char =
2545 (vc->vc_video_erase_char & 0xff00) | ' ';
2546 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2547 }
2548 return;
2549 case ESsetG0:
2550 vc_setGx(vc, 0, c);
2551 vc->vc_state = ESnormal;
2552 return;
2553 case ESsetG1:
2554 vc_setGx(vc, 1, c);
2555 vc->vc_state = ESnormal;
2556 return;
2557 case ESapc:
2558 return;
2559 case ESosc:
2560 return;
2561 case ESpm:
2562 return;
2563 case ESdcs:
2564 return;
2565 default:
2566 vc->vc_state = ESnormal;
2567 }
2568}
2569
2570/* is_double_width() is based on the wcwidth() implementation by
2571 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2572 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2573 */
2574struct interval {
2575 uint32_t first;
2576 uint32_t last;
2577};
2578
2579static int ucs_cmp(const void *key, const void *elt)
2580{
2581 uint32_t ucs = *(uint32_t *)key;
2582 struct interval e = *(struct interval *) elt;
2583
2584 if (ucs > e.last)
2585 return 1;
2586 else if (ucs < e.first)
2587 return -1;
2588 return 0;
2589}
2590
2591static int is_double_width(uint32_t ucs)
2592{
2593 static const struct interval double_width[] = {
2594 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2595 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2596 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2597 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2598 };
2599 if (ucs < double_width[0].first ||
2600 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2601 return 0;
2602
2603 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2604 sizeof(struct interval), ucs_cmp) != NULL;
2605}
2606
2607struct vc_draw_region {
2608 unsigned long from, to;
2609 int x;
2610};
2611
2612static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2613{
2614 if (draw->x < 0)
2615 return;
2616
2617 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2618 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2619 draw->x);
2620 draw->x = -1;
2621}
2622
2623static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2624{
2625 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2626 if (vc->vc_toggle_meta)
2627 c |= 0x80;
2628
2629 return vc->vc_translate[c];
2630 }
2631
2632 return c;
2633}
2634
2635
2636/**
2637 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2638 * @c: the received character, or U+FFFD for invalid sequences.
2639 */
2640static inline int vc_sanitize_unicode(const int c)
2641{
2642 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2643 return 0xfffd;
2644
2645 return c;
2646}
2647
2648/**
2649 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2650 * @vc: virtual console
2651 * @c: character to translate
2652 * @rescan: we return true if we need more (continuation) data
2653 *
2654 * @vc_utf_char is the being-constructed unicode character.
2655 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2656 * @vc_npar is the number of continuation bytes arrived so far.
2657 */
2658static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2659{
2660 static const u32 utf8_length_changes[] = {
2661 0x0000007f, 0x000007ff, 0x0000ffff,
2662 0x001fffff, 0x03ffffff, 0x7fffffff
2663 };
2664
2665 /* Continuation byte received */
2666 if ((c & 0xc0) == 0x80) {
2667 /* Unexpected continuation byte? */
2668 if (!vc->vc_utf_count)
2669 return 0xfffd;
2670
2671 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2672 vc->vc_npar++;
2673 if (--vc->vc_utf_count)
2674 goto need_more_bytes;
2675
2676 /* Got a whole character */
2677 c = vc->vc_utf_char;
2678 /* Reject overlong sequences */
2679 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2680 c > utf8_length_changes[vc->vc_npar])
2681 return 0xfffd;
2682
2683 return vc_sanitize_unicode(c);
2684 }
2685
2686 /* Single ASCII byte or first byte of a sequence received */
2687 if (vc->vc_utf_count) {
2688 /* Continuation byte expected */
2689 *rescan = true;
2690 vc->vc_utf_count = 0;
2691 return 0xfffd;
2692 }
2693
2694 /* Nothing to do if an ASCII byte was received */
2695 if (c <= 0x7f)
2696 return c;
2697
2698 /* First byte of a multibyte sequence received */
2699 vc->vc_npar = 0;
2700 if ((c & 0xe0) == 0xc0) {
2701 vc->vc_utf_count = 1;
2702 vc->vc_utf_char = (c & 0x1f);
2703 } else if ((c & 0xf0) == 0xe0) {
2704 vc->vc_utf_count = 2;
2705 vc->vc_utf_char = (c & 0x0f);
2706 } else if ((c & 0xf8) == 0xf0) {
2707 vc->vc_utf_count = 3;
2708 vc->vc_utf_char = (c & 0x07);
2709 } else if ((c & 0xfc) == 0xf8) {
2710 vc->vc_utf_count = 4;
2711 vc->vc_utf_char = (c & 0x03);
2712 } else if ((c & 0xfe) == 0xfc) {
2713 vc->vc_utf_count = 5;
2714 vc->vc_utf_char = (c & 0x01);
2715 } else {
2716 /* 254 and 255 are invalid */
2717 return 0xfffd;
2718 }
2719
2720need_more_bytes:
2721 return -1;
2722}
2723
2724static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2725{
2726 /* Do no translation at all in control states */
2727 if (vc->vc_state != ESnormal)
2728 return *c;
2729
2730 if (vc->vc_utf && !vc->vc_disp_ctrl)
2731 return *c = vc_translate_unicode(vc, *c, rescan);
2732
2733 /* no utf or alternate charset mode */
2734 return vc_translate_ascii(vc, *c);
2735}
2736
2737static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2738{
2739 if (!vc->vc_can_do_color)
2740 return vc->vc_attr ^ 0x08;
2741
2742 if (vc->vc_hi_font_mask == 0x100)
2743 return (vc->vc_attr & 0x11) |
2744 ((vc->vc_attr & 0xe0) >> 4) |
2745 ((vc->vc_attr & 0x0e) << 4);
2746
2747 return (vc->vc_attr & 0x88) |
2748 ((vc->vc_attr & 0x70) >> 4) |
2749 ((vc->vc_attr & 0x07) << 4);
2750}
2751
2752static bool vc_is_control(struct vc_data *vc, int tc, int c)
2753{
2754 /*
2755 * A bitmap for codes <32. A bit of 1 indicates that the code
2756 * corresponding to that bit number invokes some special action (such
2757 * as cursor movement) and should not be displayed as a glyph unless
2758 * the disp_ctrl mode is explicitly enabled.
2759 */
2760 static const u32 CTRL_ACTION = 0x0d00ff81;
2761 /* Cannot be overridden by disp_ctrl */
2762 static const u32 CTRL_ALWAYS = 0x0800f501;
2763
2764 if (vc->vc_state != ESnormal)
2765 return true;
2766
2767 if (!tc)
2768 return true;
2769
2770 /*
2771 * If the original code was a control character we only allow a glyph
2772 * to be displayed if the code is not normally used (such as for cursor
2773 * movement) or if the disp_ctrl mode has been explicitly enabled.
2774 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2775 * displayed as control characters, as the console would be pretty
2776 * useless without them; to display an arbitrary font position use the
2777 * direct-to-font zone in UTF-8 mode.
2778 */
2779 if (c < 32) {
2780 if (vc->vc_disp_ctrl)
2781 return CTRL_ALWAYS & BIT(c);
2782 else
2783 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2784 }
2785
2786 if (c == 127 && !vc->vc_disp_ctrl)
2787 return true;
2788
2789 if (c == 128 + 27)
2790 return true;
2791
2792 return false;
2793}
2794
2795static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2796 struct vc_draw_region *draw)
2797{
2798 int next_c;
2799 unsigned char vc_attr = vc->vc_attr;
2800 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2801 u8 width = 1;
2802 bool inverse = false;
2803
2804 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2805 if (is_double_width(c))
2806 width = 2;
2807 }
2808
2809 /* Now try to find out how to display it */
2810 tc = conv_uni_to_pc(vc, tc);
2811 if (tc & ~charmask) {
2812 if (tc == -1 || tc == -2)
2813 return -1; /* nothing to display */
2814
2815 /* Glyph not found */
2816 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2817 !(c & ~charmask)) {
2818 /*
2819 * In legacy mode use the glyph we get by a 1:1
2820 * mapping.
2821 * This would make absolutely no sense with Unicode in
2822 * mind, but do this for ASCII characters since a font
2823 * may lack Unicode mapping info and we don't want to
2824 * end up with having question marks only.
2825 */
2826 tc = c;
2827 } else {
2828 /*
2829 * Display U+FFFD. If it's not found, display an inverse
2830 * question mark.
2831 */
2832 tc = conv_uni_to_pc(vc, 0xfffd);
2833 if (tc < 0) {
2834 inverse = true;
2835 tc = conv_uni_to_pc(vc, '?');
2836 if (tc < 0)
2837 tc = '?';
2838
2839 vc_attr = vc_invert_attr(vc);
2840 con_flush(vc, draw);
2841 }
2842 }
2843 }
2844
2845 next_c = c;
2846 while (1) {
2847 if (vc->vc_need_wrap || vc->vc_decim)
2848 con_flush(vc, draw);
2849 if (vc->vc_need_wrap) {
2850 cr(vc);
2851 lf(vc);
2852 }
2853 if (vc->vc_decim)
2854 insert_char(vc, 1);
2855 vc_uniscr_putc(vc, next_c);
2856
2857 if (himask)
2858 tc = ((tc & 0x100) ? himask : 0) |
2859 (tc & 0xff);
2860 tc |= (vc_attr << 8) & ~himask;
2861
2862 scr_writew(tc, (u16 *)vc->vc_pos);
2863
2864 if (con_should_update(vc) && draw->x < 0) {
2865 draw->x = vc->state.x;
2866 draw->from = vc->vc_pos;
2867 }
2868 if (vc->state.x == vc->vc_cols - 1) {
2869 vc->vc_need_wrap = vc->vc_decawm;
2870 draw->to = vc->vc_pos + 2;
2871 } else {
2872 vc->state.x++;
2873 draw->to = (vc->vc_pos += 2);
2874 }
2875
2876 if (!--width)
2877 break;
2878
2879 /* A space is printed in the second column */
2880 tc = conv_uni_to_pc(vc, ' ');
2881 if (tc < 0)
2882 tc = ' ';
2883 next_c = ' ';
2884 }
2885 notify_write(vc, c);
2886
2887 if (inverse)
2888 con_flush(vc, draw);
2889
2890 return 0;
2891}
2892
2893/* acquires console_lock */
2894static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2895{
2896 struct vc_draw_region draw = {
2897 .x = -1,
2898 };
2899 int c, tc, n = 0;
2900 unsigned int currcons;
2901 struct vc_data *vc;
2902 struct vt_notifier_param param;
2903 bool rescan;
2904
2905 if (in_interrupt())
2906 return count;
2907
2908 console_lock();
2909 vc = tty->driver_data;
2910 if (vc == NULL) {
2911 pr_err("vt: argh, driver_data is NULL !\n");
2912 console_unlock();
2913 return 0;
2914 }
2915
2916 currcons = vc->vc_num;
2917 if (!vc_cons_allocated(currcons)) {
2918 /* could this happen? */
2919 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2920 console_unlock();
2921 return 0;
2922 }
2923
2924
2925 /* undraw cursor first */
2926 if (con_is_fg(vc))
2927 hide_cursor(vc);
2928
2929 param.vc = vc;
2930
2931 while (!tty->flow.stopped && count) {
2932 int orig = *buf;
2933 buf++;
2934 n++;
2935 count--;
2936rescan_last_byte:
2937 c = orig;
2938 rescan = false;
2939
2940 tc = vc_translate(vc, &c, &rescan);
2941 if (tc == -1)
2942 continue;
2943
2944 param.c = tc;
2945 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2946 ¶m) == NOTIFY_STOP)
2947 continue;
2948
2949 if (vc_is_control(vc, tc, c)) {
2950 con_flush(vc, &draw);
2951 do_con_trol(tty, vc, orig);
2952 continue;
2953 }
2954
2955 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2956 continue;
2957
2958 if (rescan)
2959 goto rescan_last_byte;
2960 }
2961 con_flush(vc, &draw);
2962 vc_uniscr_debug_check(vc);
2963 console_conditional_schedule();
2964 notify_update(vc);
2965 console_unlock();
2966 return n;
2967}
2968
2969/*
2970 * This is the console switching callback.
2971 *
2972 * Doing console switching in a process context allows
2973 * us to do the switches asynchronously (needed when we want
2974 * to switch due to a keyboard interrupt). Synchronization
2975 * with other console code and prevention of re-entrancy is
2976 * ensured with console_lock.
2977 */
2978static void console_callback(struct work_struct *ignored)
2979{
2980 console_lock();
2981
2982 if (want_console >= 0) {
2983 if (want_console != fg_console &&
2984 vc_cons_allocated(want_console)) {
2985 hide_cursor(vc_cons[fg_console].d);
2986 change_console(vc_cons[want_console].d);
2987 /* we only changed when the console had already
2988 been allocated - a new console is not created
2989 in an interrupt routine */
2990 }
2991 want_console = -1;
2992 }
2993 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2994 do_poke_blanked_console = 0;
2995 poke_blanked_console();
2996 }
2997 if (scrollback_delta) {
2998 struct vc_data *vc = vc_cons[fg_console].d;
2999 clear_selection();
3000 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3001 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3002 scrollback_delta = 0;
3003 }
3004 if (blank_timer_expired) {
3005 do_blank_screen(0);
3006 blank_timer_expired = 0;
3007 }
3008 notify_update(vc_cons[fg_console].d);
3009
3010 console_unlock();
3011}
3012
3013int set_console(int nr)
3014{
3015 struct vc_data *vc = vc_cons[fg_console].d;
3016
3017 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3018 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3019
3020 /*
3021 * Console switch will fail in console_callback() or
3022 * change_console() so there is no point scheduling
3023 * the callback
3024 *
3025 * Existing set_console() users don't check the return
3026 * value so this shouldn't break anything
3027 */
3028 return -EINVAL;
3029 }
3030
3031 want_console = nr;
3032 schedule_console_callback();
3033
3034 return 0;
3035}
3036
3037struct tty_driver *console_driver;
3038
3039#ifdef CONFIG_VT_CONSOLE
3040
3041/**
3042 * vt_kmsg_redirect() - Sets/gets the kernel message console
3043 * @new: The new virtual terminal number or -1 if the console should stay
3044 * unchanged
3045 *
3046 * By default, the kernel messages are always printed on the current virtual
3047 * console. However, the user may modify that default with the
3048 * TIOCL_SETKMSGREDIRECT ioctl call.
3049 *
3050 * This function sets the kernel message console to be @new. It returns the old
3051 * virtual console number. The virtual terminal number 0 (both as parameter and
3052 * return value) means no redirection (i.e. always printed on the currently
3053 * active console).
3054 *
3055 * The parameter -1 means that only the current console is returned, but the
3056 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3057 * case to make the code more understandable.
3058 *
3059 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3060 * the parameter and always returns 0.
3061 */
3062int vt_kmsg_redirect(int new)
3063{
3064 static int kmsg_con;
3065
3066 if (new != -1)
3067 return xchg(&kmsg_con, new);
3068 else
3069 return kmsg_con;
3070}
3071
3072/*
3073 * Console on virtual terminal
3074 *
3075 * The console must be locked when we get here.
3076 */
3077
3078static void vt_console_print(struct console *co, const char *b, unsigned count)
3079{
3080 struct vc_data *vc = vc_cons[fg_console].d;
3081 unsigned char c;
3082 static DEFINE_SPINLOCK(printing_lock);
3083 const ushort *start;
3084 ushort start_x, cnt;
3085 int kmsg_console;
3086
3087 WARN_CONSOLE_UNLOCKED();
3088
3089 /* this protects against concurrent oops only */
3090 if (!spin_trylock(&printing_lock))
3091 return;
3092
3093 kmsg_console = vt_get_kmsg_redirect();
3094 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3095 vc = vc_cons[kmsg_console - 1].d;
3096
3097 if (!vc_cons_allocated(fg_console)) {
3098 /* impossible */
3099 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3100 goto quit;
3101 }
3102
3103 if (vc->vc_mode != KD_TEXT)
3104 goto quit;
3105
3106 /* undraw cursor first */
3107 if (con_is_fg(vc))
3108 hide_cursor(vc);
3109
3110 start = (ushort *)vc->vc_pos;
3111 start_x = vc->state.x;
3112 cnt = 0;
3113 while (count--) {
3114 c = *b++;
3115 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3116 if (cnt && con_is_visible(vc))
3117 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3118 cnt = 0;
3119 if (c == 8) { /* backspace */
3120 bs(vc);
3121 start = (ushort *)vc->vc_pos;
3122 start_x = vc->state.x;
3123 continue;
3124 }
3125 if (c != 13)
3126 lf(vc);
3127 cr(vc);
3128 start = (ushort *)vc->vc_pos;
3129 start_x = vc->state.x;
3130 if (c == 10 || c == 13)
3131 continue;
3132 }
3133 vc_uniscr_putc(vc, c);
3134 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3135 notify_write(vc, c);
3136 cnt++;
3137 if (vc->state.x == vc->vc_cols - 1) {
3138 vc->vc_need_wrap = 1;
3139 } else {
3140 vc->vc_pos += 2;
3141 vc->state.x++;
3142 }
3143 }
3144 if (cnt && con_is_visible(vc))
3145 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3146 set_cursor(vc);
3147 notify_update(vc);
3148
3149quit:
3150 spin_unlock(&printing_lock);
3151}
3152
3153static struct tty_driver *vt_console_device(struct console *c, int *index)
3154{
3155 *index = c->index ? c->index-1 : fg_console;
3156 return console_driver;
3157}
3158
3159static struct console vt_console_driver = {
3160 .name = "tty",
3161 .write = vt_console_print,
3162 .device = vt_console_device,
3163 .unblank = unblank_screen,
3164 .flags = CON_PRINTBUFFER,
3165 .index = -1,
3166};
3167#endif
3168
3169/*
3170 * Handling of Linux-specific VC ioctls
3171 */
3172
3173/*
3174 * Generally a bit racy with respect to console_lock();.
3175 *
3176 * There are some functions which don't need it.
3177 *
3178 * There are some functions which can sleep for arbitrary periods
3179 * (paste_selection) but we don't need the lock there anyway.
3180 *
3181 * set_selection_user has locking, and definitely needs it
3182 */
3183
3184int tioclinux(struct tty_struct *tty, unsigned long arg)
3185{
3186 char type, data;
3187 char __user *p = (char __user *)arg;
3188 int lines;
3189 int ret;
3190
3191 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3192 return -EPERM;
3193 if (get_user(type, p))
3194 return -EFAULT;
3195 ret = 0;
3196
3197 switch (type)
3198 {
3199 case TIOCL_SETSEL:
3200 ret = set_selection_user((struct tiocl_selection
3201 __user *)(p+1), tty);
3202 break;
3203 case TIOCL_PASTESEL:
3204 ret = paste_selection(tty);
3205 break;
3206 case TIOCL_UNBLANKSCREEN:
3207 console_lock();
3208 unblank_screen();
3209 console_unlock();
3210 break;
3211 case TIOCL_SELLOADLUT:
3212 console_lock();
3213 ret = sel_loadlut(p);
3214 console_unlock();
3215 break;
3216 case TIOCL_GETSHIFTSTATE:
3217
3218 /*
3219 * Make it possible to react to Shift+Mousebutton.
3220 * Note that 'shift_state' is an undocumented
3221 * kernel-internal variable; programs not closely
3222 * related to the kernel should not use this.
3223 */
3224 data = vt_get_shift_state();
3225 ret = put_user(data, p);
3226 break;
3227 case TIOCL_GETMOUSEREPORTING:
3228 console_lock(); /* May be overkill */
3229 data = mouse_reporting();
3230 console_unlock();
3231 ret = put_user(data, p);
3232 break;
3233 case TIOCL_SETVESABLANK:
3234 console_lock();
3235 ret = set_vesa_blanking(p);
3236 console_unlock();
3237 break;
3238 case TIOCL_GETKMSGREDIRECT:
3239 data = vt_get_kmsg_redirect();
3240 ret = put_user(data, p);
3241 break;
3242 case TIOCL_SETKMSGREDIRECT:
3243 if (!capable(CAP_SYS_ADMIN)) {
3244 ret = -EPERM;
3245 } else {
3246 if (get_user(data, p+1))
3247 ret = -EFAULT;
3248 else
3249 vt_kmsg_redirect(data);
3250 }
3251 break;
3252 case TIOCL_GETFGCONSOLE:
3253 /* No locking needed as this is a transiently
3254 correct return anyway if the caller hasn't
3255 disabled switching */
3256 ret = fg_console;
3257 break;
3258 case TIOCL_SCROLLCONSOLE:
3259 if (get_user(lines, (s32 __user *)(p+4))) {
3260 ret = -EFAULT;
3261 } else {
3262 /* Need the console lock here. Note that lots
3263 of other calls need fixing before the lock
3264 is actually useful ! */
3265 console_lock();
3266 scrollfront(vc_cons[fg_console].d, lines);
3267 console_unlock();
3268 ret = 0;
3269 }
3270 break;
3271 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3272 console_lock();
3273 ignore_poke = 1;
3274 do_blank_screen(0);
3275 console_unlock();
3276 break;
3277 case TIOCL_BLANKEDSCREEN:
3278 ret = console_blanked;
3279 break;
3280 default:
3281 ret = -EINVAL;
3282 break;
3283 }
3284 return ret;
3285}
3286
3287/*
3288 * /dev/ttyN handling
3289 */
3290
3291static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3292{
3293 int retval;
3294
3295 retval = do_con_write(tty, buf, count);
3296 con_flush_chars(tty);
3297
3298 return retval;
3299}
3300
3301static int con_put_char(struct tty_struct *tty, unsigned char ch)
3302{
3303 return do_con_write(tty, &ch, 1);
3304}
3305
3306static unsigned int con_write_room(struct tty_struct *tty)
3307{
3308 if (tty->flow.stopped)
3309 return 0;
3310 return 32768; /* No limit, really; we're not buffering */
3311}
3312
3313/*
3314 * con_throttle and con_unthrottle are only used for
3315 * paste_selection(), which has to stuff in a large number of
3316 * characters...
3317 */
3318static void con_throttle(struct tty_struct *tty)
3319{
3320}
3321
3322static void con_unthrottle(struct tty_struct *tty)
3323{
3324 struct vc_data *vc = tty->driver_data;
3325
3326 wake_up_interruptible(&vc->paste_wait);
3327}
3328
3329/*
3330 * Turn the Scroll-Lock LED on when the tty is stopped
3331 */
3332static void con_stop(struct tty_struct *tty)
3333{
3334 int console_num;
3335 if (!tty)
3336 return;
3337 console_num = tty->index;
3338 if (!vc_cons_allocated(console_num))
3339 return;
3340 vt_kbd_con_stop(console_num);
3341}
3342
3343/*
3344 * Turn the Scroll-Lock LED off when the console is started
3345 */
3346static void con_start(struct tty_struct *tty)
3347{
3348 int console_num;
3349 if (!tty)
3350 return;
3351 console_num = tty->index;
3352 if (!vc_cons_allocated(console_num))
3353 return;
3354 vt_kbd_con_start(console_num);
3355}
3356
3357static void con_flush_chars(struct tty_struct *tty)
3358{
3359 struct vc_data *vc;
3360
3361 if (in_interrupt()) /* from flush_to_ldisc */
3362 return;
3363
3364 /* if we race with con_close(), vt may be null */
3365 console_lock();
3366 vc = tty->driver_data;
3367 if (vc)
3368 set_cursor(vc);
3369 console_unlock();
3370}
3371
3372/*
3373 * Allocate the console screen memory.
3374 */
3375static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3376{
3377 unsigned int currcons = tty->index;
3378 struct vc_data *vc;
3379 int ret;
3380
3381 console_lock();
3382 ret = vc_allocate(currcons);
3383 if (ret)
3384 goto unlock;
3385
3386 vc = vc_cons[currcons].d;
3387
3388 /* Still being freed */
3389 if (vc->port.tty) {
3390 ret = -ERESTARTSYS;
3391 goto unlock;
3392 }
3393
3394 ret = tty_port_install(&vc->port, driver, tty);
3395 if (ret)
3396 goto unlock;
3397
3398 tty->driver_data = vc;
3399 vc->port.tty = tty;
3400 tty_port_get(&vc->port);
3401
3402 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3403 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3404 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3405 }
3406 if (vc->vc_utf)
3407 tty->termios.c_iflag |= IUTF8;
3408 else
3409 tty->termios.c_iflag &= ~IUTF8;
3410unlock:
3411 console_unlock();
3412 return ret;
3413}
3414
3415static int con_open(struct tty_struct *tty, struct file *filp)
3416{
3417 /* everything done in install */
3418 return 0;
3419}
3420
3421
3422static void con_close(struct tty_struct *tty, struct file *filp)
3423{
3424 /* Nothing to do - we defer to shutdown */
3425}
3426
3427static void con_shutdown(struct tty_struct *tty)
3428{
3429 struct vc_data *vc = tty->driver_data;
3430 BUG_ON(vc == NULL);
3431 console_lock();
3432 vc->port.tty = NULL;
3433 console_unlock();
3434}
3435
3436static void con_cleanup(struct tty_struct *tty)
3437{
3438 struct vc_data *vc = tty->driver_data;
3439
3440 tty_port_put(&vc->port);
3441}
3442
3443static int default_color = 7; /* white */
3444static int default_italic_color = 2; // green (ASCII)
3445static int default_underline_color = 3; // cyan (ASCII)
3446module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3447module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3448module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3449
3450static void vc_init(struct vc_data *vc, unsigned int rows,
3451 unsigned int cols, int do_clear)
3452{
3453 int j, k ;
3454
3455 vc->vc_cols = cols;
3456 vc->vc_rows = rows;
3457 vc->vc_size_row = cols << 1;
3458 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3459
3460 set_origin(vc);
3461 vc->vc_pos = vc->vc_origin;
3462 reset_vc(vc);
3463 for (j=k=0; j<16; j++) {
3464 vc->vc_palette[k++] = default_red[j] ;
3465 vc->vc_palette[k++] = default_grn[j] ;
3466 vc->vc_palette[k++] = default_blu[j] ;
3467 }
3468 vc->vc_def_color = default_color;
3469 vc->vc_ulcolor = default_underline_color;
3470 vc->vc_itcolor = default_italic_color;
3471 vc->vc_halfcolor = 0x08; /* grey */
3472 init_waitqueue_head(&vc->paste_wait);
3473 reset_terminal(vc, do_clear);
3474}
3475
3476/*
3477 * This routine initializes console interrupts, and does nothing
3478 * else. If you want the screen to clear, call tty_write with
3479 * the appropriate escape-sequence.
3480 */
3481
3482static int __init con_init(void)
3483{
3484 const char *display_desc = NULL;
3485 struct vc_data *vc;
3486 unsigned int currcons = 0, i;
3487
3488 console_lock();
3489
3490 if (!conswitchp)
3491 conswitchp = &dummy_con;
3492 display_desc = conswitchp->con_startup();
3493 if (!display_desc) {
3494 fg_console = 0;
3495 console_unlock();
3496 return 0;
3497 }
3498
3499 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500 struct con_driver *con_driver = ®istered_con_driver[i];
3501
3502 if (con_driver->con == NULL) {
3503 con_driver->con = conswitchp;
3504 con_driver->desc = display_desc;
3505 con_driver->flag = CON_DRIVER_FLAG_INIT;
3506 con_driver->first = 0;
3507 con_driver->last = MAX_NR_CONSOLES - 1;
3508 break;
3509 }
3510 }
3511
3512 for (i = 0; i < MAX_NR_CONSOLES; i++)
3513 con_driver_map[i] = conswitchp;
3514
3515 if (blankinterval) {
3516 blank_state = blank_normal_wait;
3517 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3518 }
3519
3520 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3521 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3522 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3523 tty_port_init(&vc->port);
3524 visual_init(vc, currcons, 1);
3525 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3526 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3527 vc_init(vc, vc->vc_rows, vc->vc_cols,
3528 currcons || !vc->vc_sw->con_save_screen);
3529 }
3530 currcons = fg_console = 0;
3531 master_display_fg = vc = vc_cons[currcons].d;
3532 set_origin(vc);
3533 save_screen(vc);
3534 gotoxy(vc, vc->state.x, vc->state.y);
3535 csi_J(vc, 0);
3536 update_screen(vc);
3537 pr_info("Console: %s %s %dx%d\n",
3538 vc->vc_can_do_color ? "colour" : "mono",
3539 display_desc, vc->vc_cols, vc->vc_rows);
3540
3541 console_unlock();
3542
3543#ifdef CONFIG_VT_CONSOLE
3544 register_console(&vt_console_driver);
3545#endif
3546 return 0;
3547}
3548console_initcall(con_init);
3549
3550static const struct tty_operations con_ops = {
3551 .install = con_install,
3552 .open = con_open,
3553 .close = con_close,
3554 .write = con_write,
3555 .write_room = con_write_room,
3556 .put_char = con_put_char,
3557 .flush_chars = con_flush_chars,
3558 .ioctl = vt_ioctl,
3559#ifdef CONFIG_COMPAT
3560 .compat_ioctl = vt_compat_ioctl,
3561#endif
3562 .stop = con_stop,
3563 .start = con_start,
3564 .throttle = con_throttle,
3565 .unthrottle = con_unthrottle,
3566 .resize = vt_resize,
3567 .shutdown = con_shutdown,
3568 .cleanup = con_cleanup,
3569};
3570
3571static struct cdev vc0_cdev;
3572
3573static ssize_t show_tty_active(struct device *dev,
3574 struct device_attribute *attr, char *buf)
3575{
3576 return sprintf(buf, "tty%d\n", fg_console + 1);
3577}
3578static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3579
3580static struct attribute *vt_dev_attrs[] = {
3581 &dev_attr_active.attr,
3582 NULL
3583};
3584
3585ATTRIBUTE_GROUPS(vt_dev);
3586
3587int __init vty_init(const struct file_operations *console_fops)
3588{
3589 cdev_init(&vc0_cdev, console_fops);
3590 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3591 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3592 panic("Couldn't register /dev/tty0 driver\n");
3593 tty0dev = device_create_with_groups(tty_class, NULL,
3594 MKDEV(TTY_MAJOR, 0), NULL,
3595 vt_dev_groups, "tty0");
3596 if (IS_ERR(tty0dev))
3597 tty0dev = NULL;
3598
3599 vcs_init();
3600
3601 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3602 TTY_DRIVER_RESET_TERMIOS);
3603 if (IS_ERR(console_driver))
3604 panic("Couldn't allocate console driver\n");
3605
3606 console_driver->name = "tty";
3607 console_driver->name_base = 1;
3608 console_driver->major = TTY_MAJOR;
3609 console_driver->minor_start = 1;
3610 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3611 console_driver->init_termios = tty_std_termios;
3612 if (default_utf8)
3613 console_driver->init_termios.c_iflag |= IUTF8;
3614 tty_set_operations(console_driver, &con_ops);
3615 if (tty_register_driver(console_driver))
3616 panic("Couldn't register console driver\n");
3617 kbd_init();
3618 console_map_init();
3619#ifdef CONFIG_MDA_CONSOLE
3620 mda_console_init();
3621#endif
3622 return 0;
3623}
3624
3625#ifndef VT_SINGLE_DRIVER
3626
3627static struct class *vtconsole_class;
3628
3629static int do_bind_con_driver(const struct consw *csw, int first, int last,
3630 int deflt)
3631{
3632 struct module *owner = csw->owner;
3633 const char *desc = NULL;
3634 struct con_driver *con_driver;
3635 int i, j = -1, k = -1, retval = -ENODEV;
3636
3637 if (!try_module_get(owner))
3638 return -ENODEV;
3639
3640 WARN_CONSOLE_UNLOCKED();
3641
3642 /* check if driver is registered */
3643 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3644 con_driver = ®istered_con_driver[i];
3645
3646 if (con_driver->con == csw) {
3647 desc = con_driver->desc;
3648 retval = 0;
3649 break;
3650 }
3651 }
3652
3653 if (retval)
3654 goto err;
3655
3656 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3657 csw->con_startup();
3658 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3659 }
3660
3661 if (deflt) {
3662 if (conswitchp)
3663 module_put(conswitchp->owner);
3664
3665 __module_get(owner);
3666 conswitchp = csw;
3667 }
3668
3669 first = max(first, con_driver->first);
3670 last = min(last, con_driver->last);
3671
3672 for (i = first; i <= last; i++) {
3673 int old_was_color;
3674 struct vc_data *vc = vc_cons[i].d;
3675
3676 if (con_driver_map[i])
3677 module_put(con_driver_map[i]->owner);
3678 __module_get(owner);
3679 con_driver_map[i] = csw;
3680
3681 if (!vc || !vc->vc_sw)
3682 continue;
3683
3684 j = i;
3685
3686 if (con_is_visible(vc)) {
3687 k = i;
3688 save_screen(vc);
3689 }
3690
3691 old_was_color = vc->vc_can_do_color;
3692 vc->vc_sw->con_deinit(vc);
3693 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3694 visual_init(vc, i, 0);
3695 set_origin(vc);
3696 update_attr(vc);
3697
3698 /* If the console changed between mono <-> color, then
3699 * the attributes in the screenbuf will be wrong. The
3700 * following resets all attributes to something sane.
3701 */
3702 if (old_was_color != vc->vc_can_do_color)
3703 clear_buffer_attributes(vc);
3704 }
3705
3706 pr_info("Console: switching ");
3707 if (!deflt)
3708 pr_cont("consoles %d-%d ", first + 1, last + 1);
3709 if (j >= 0) {
3710 struct vc_data *vc = vc_cons[j].d;
3711
3712 pr_cont("to %s %s %dx%d\n",
3713 vc->vc_can_do_color ? "colour" : "mono",
3714 desc, vc->vc_cols, vc->vc_rows);
3715
3716 if (k >= 0) {
3717 vc = vc_cons[k].d;
3718 update_screen(vc);
3719 }
3720 } else {
3721 pr_cont("to %s\n", desc);
3722 }
3723
3724 retval = 0;
3725err:
3726 module_put(owner);
3727 return retval;
3728};
3729
3730
3731#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3732int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3733{
3734 struct module *owner = csw->owner;
3735 const struct consw *defcsw = NULL;
3736 struct con_driver *con_driver = NULL, *con_back = NULL;
3737 int i, retval = -ENODEV;
3738
3739 if (!try_module_get(owner))
3740 return -ENODEV;
3741
3742 WARN_CONSOLE_UNLOCKED();
3743
3744 /* check if driver is registered and if it is unbindable */
3745 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3746 con_driver = ®istered_con_driver[i];
3747
3748 if (con_driver->con == csw &&
3749 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3750 retval = 0;
3751 break;
3752 }
3753 }
3754
3755 if (retval)
3756 goto err;
3757
3758 retval = -ENODEV;
3759
3760 /* check if backup driver exists */
3761 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3762 con_back = ®istered_con_driver[i];
3763
3764 if (con_back->con && con_back->con != csw) {
3765 defcsw = con_back->con;
3766 retval = 0;
3767 break;
3768 }
3769 }
3770
3771 if (retval)
3772 goto err;
3773
3774 if (!con_is_bound(csw))
3775 goto err;
3776
3777 first = max(first, con_driver->first);
3778 last = min(last, con_driver->last);
3779
3780 for (i = first; i <= last; i++) {
3781 if (con_driver_map[i] == csw) {
3782 module_put(csw->owner);
3783 con_driver_map[i] = NULL;
3784 }
3785 }
3786
3787 if (!con_is_bound(defcsw)) {
3788 const struct consw *defconsw = conswitchp;
3789
3790 defcsw->con_startup();
3791 con_back->flag |= CON_DRIVER_FLAG_INIT;
3792 /*
3793 * vgacon may change the default driver to point
3794 * to dummycon, we restore it here...
3795 */
3796 conswitchp = defconsw;
3797 }
3798
3799 if (!con_is_bound(csw))
3800 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3801
3802 /* ignore return value, binding should not fail */
3803 do_bind_con_driver(defcsw, first, last, deflt);
3804err:
3805 module_put(owner);
3806 return retval;
3807
3808}
3809EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3810
3811static int vt_bind(struct con_driver *con)
3812{
3813 const struct consw *defcsw = NULL, *csw = NULL;
3814 int i, more = 1, first = -1, last = -1, deflt = 0;
3815
3816 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3817 goto err;
3818
3819 csw = con->con;
3820
3821 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3822 struct con_driver *con = ®istered_con_driver[i];
3823
3824 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3825 defcsw = con->con;
3826 break;
3827 }
3828 }
3829
3830 if (!defcsw)
3831 goto err;
3832
3833 while (more) {
3834 more = 0;
3835
3836 for (i = con->first; i <= con->last; i++) {
3837 if (con_driver_map[i] == defcsw) {
3838 if (first == -1)
3839 first = i;
3840 last = i;
3841 more = 1;
3842 } else if (first != -1)
3843 break;
3844 }
3845
3846 if (first == 0 && last == MAX_NR_CONSOLES -1)
3847 deflt = 1;
3848
3849 if (first != -1)
3850 do_bind_con_driver(csw, first, last, deflt);
3851
3852 first = -1;
3853 last = -1;
3854 deflt = 0;
3855 }
3856
3857err:
3858 return 0;
3859}
3860
3861static int vt_unbind(struct con_driver *con)
3862{
3863 const struct consw *csw = NULL;
3864 int i, more = 1, first = -1, last = -1, deflt = 0;
3865 int ret;
3866
3867 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3868 goto err;
3869
3870 csw = con->con;
3871
3872 while (more) {
3873 more = 0;
3874
3875 for (i = con->first; i <= con->last; i++) {
3876 if (con_driver_map[i] == csw) {
3877 if (first == -1)
3878 first = i;
3879 last = i;
3880 more = 1;
3881 } else if (first != -1)
3882 break;
3883 }
3884
3885 if (first == 0 && last == MAX_NR_CONSOLES -1)
3886 deflt = 1;
3887
3888 if (first != -1) {
3889 ret = do_unbind_con_driver(csw, first, last, deflt);
3890 if (ret != 0)
3891 return ret;
3892 }
3893
3894 first = -1;
3895 last = -1;
3896 deflt = 0;
3897 }
3898
3899err:
3900 return 0;
3901}
3902#else
3903static inline int vt_bind(struct con_driver *con)
3904{
3905 return 0;
3906}
3907static inline int vt_unbind(struct con_driver *con)
3908{
3909 return 0;
3910}
3911#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3912
3913static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3914 const char *buf, size_t count)
3915{
3916 struct con_driver *con = dev_get_drvdata(dev);
3917 int bind = simple_strtoul(buf, NULL, 0);
3918
3919 console_lock();
3920
3921 if (bind)
3922 vt_bind(con);
3923 else
3924 vt_unbind(con);
3925
3926 console_unlock();
3927
3928 return count;
3929}
3930
3931static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3932 char *buf)
3933{
3934 struct con_driver *con = dev_get_drvdata(dev);
3935 int bind;
3936
3937 console_lock();
3938 bind = con_is_bound(con->con);
3939 console_unlock();
3940
3941 return sysfs_emit(buf, "%i\n", bind);
3942}
3943
3944static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3945 char *buf)
3946{
3947 struct con_driver *con = dev_get_drvdata(dev);
3948
3949 return sysfs_emit(buf, "%s %s\n",
3950 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3951 con->desc);
3952
3953}
3954
3955static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3956static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3957
3958static struct attribute *con_dev_attrs[] = {
3959 &dev_attr_bind.attr,
3960 &dev_attr_name.attr,
3961 NULL
3962};
3963
3964ATTRIBUTE_GROUPS(con_dev);
3965
3966static int vtconsole_init_device(struct con_driver *con)
3967{
3968 con->flag |= CON_DRIVER_FLAG_ATTR;
3969 return 0;
3970}
3971
3972static void vtconsole_deinit_device(struct con_driver *con)
3973{
3974 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3975}
3976
3977/**
3978 * con_is_bound - checks if driver is bound to the console
3979 * @csw: console driver
3980 *
3981 * RETURNS: zero if unbound, nonzero if bound
3982 *
3983 * Drivers can call this and if zero, they should release
3984 * all resources allocated on con_startup()
3985 */
3986int con_is_bound(const struct consw *csw)
3987{
3988 int i, bound = 0;
3989
3990 WARN_CONSOLE_UNLOCKED();
3991
3992 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3993 if (con_driver_map[i] == csw) {
3994 bound = 1;
3995 break;
3996 }
3997 }
3998
3999 return bound;
4000}
4001EXPORT_SYMBOL(con_is_bound);
4002
4003/**
4004 * con_is_visible - checks whether the current console is visible
4005 * @vc: virtual console
4006 *
4007 * RETURNS: zero if not visible, nonzero if visible
4008 */
4009bool con_is_visible(const struct vc_data *vc)
4010{
4011 WARN_CONSOLE_UNLOCKED();
4012
4013 return *vc->vc_display_fg == vc;
4014}
4015EXPORT_SYMBOL(con_is_visible);
4016
4017/**
4018 * con_debug_enter - prepare the console for the kernel debugger
4019 * @vc: virtual console
4020 *
4021 * Called when the console is taken over by the kernel debugger, this
4022 * function needs to save the current console state, then put the console
4023 * into a state suitable for the kernel debugger.
4024 *
4025 * RETURNS:
4026 * Zero on success, nonzero if a failure occurred when trying to prepare
4027 * the console for the debugger.
4028 */
4029int con_debug_enter(struct vc_data *vc)
4030{
4031 int ret = 0;
4032
4033 saved_fg_console = fg_console;
4034 saved_last_console = last_console;
4035 saved_want_console = want_console;
4036 saved_vc_mode = vc->vc_mode;
4037 saved_console_blanked = console_blanked;
4038 vc->vc_mode = KD_TEXT;
4039 console_blanked = 0;
4040 if (vc->vc_sw->con_debug_enter)
4041 ret = vc->vc_sw->con_debug_enter(vc);
4042#ifdef CONFIG_KGDB_KDB
4043 /* Set the initial LINES variable if it is not already set */
4044 if (vc->vc_rows < 999) {
4045 int linecount;
4046 char lns[4];
4047 const char *setargs[3] = {
4048 "set",
4049 "LINES",
4050 lns,
4051 };
4052 if (kdbgetintenv(setargs[0], &linecount)) {
4053 snprintf(lns, 4, "%i", vc->vc_rows);
4054 kdb_set(2, setargs);
4055 }
4056 }
4057 if (vc->vc_cols < 999) {
4058 int colcount;
4059 char cols[4];
4060 const char *setargs[3] = {
4061 "set",
4062 "COLUMNS",
4063 cols,
4064 };
4065 if (kdbgetintenv(setargs[0], &colcount)) {
4066 snprintf(cols, 4, "%i", vc->vc_cols);
4067 kdb_set(2, setargs);
4068 }
4069 }
4070#endif /* CONFIG_KGDB_KDB */
4071 return ret;
4072}
4073EXPORT_SYMBOL_GPL(con_debug_enter);
4074
4075/**
4076 * con_debug_leave - restore console state
4077 *
4078 * Restore the console state to what it was before the kernel debugger
4079 * was invoked.
4080 *
4081 * RETURNS:
4082 * Zero on success, nonzero if a failure occurred when trying to restore
4083 * the console.
4084 */
4085int con_debug_leave(void)
4086{
4087 struct vc_data *vc;
4088 int ret = 0;
4089
4090 fg_console = saved_fg_console;
4091 last_console = saved_last_console;
4092 want_console = saved_want_console;
4093 console_blanked = saved_console_blanked;
4094 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4095
4096 vc = vc_cons[fg_console].d;
4097 if (vc->vc_sw->con_debug_leave)
4098 ret = vc->vc_sw->con_debug_leave(vc);
4099 return ret;
4100}
4101EXPORT_SYMBOL_GPL(con_debug_leave);
4102
4103static int do_register_con_driver(const struct consw *csw, int first, int last)
4104{
4105 struct module *owner = csw->owner;
4106 struct con_driver *con_driver;
4107 const char *desc;
4108 int i, retval;
4109
4110 WARN_CONSOLE_UNLOCKED();
4111
4112 if (!try_module_get(owner))
4113 return -ENODEV;
4114
4115 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4116 con_driver = ®istered_con_driver[i];
4117
4118 /* already registered */
4119 if (con_driver->con == csw) {
4120 retval = -EBUSY;
4121 goto err;
4122 }
4123 }
4124
4125 desc = csw->con_startup();
4126 if (!desc) {
4127 retval = -ENODEV;
4128 goto err;
4129 }
4130
4131 retval = -EINVAL;
4132
4133 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4134 con_driver = ®istered_con_driver[i];
4135
4136 if (con_driver->con == NULL &&
4137 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4138 con_driver->con = csw;
4139 con_driver->desc = desc;
4140 con_driver->node = i;
4141 con_driver->flag = CON_DRIVER_FLAG_MODULE |
4142 CON_DRIVER_FLAG_INIT;
4143 con_driver->first = first;
4144 con_driver->last = last;
4145 retval = 0;
4146 break;
4147 }
4148 }
4149
4150 if (retval)
4151 goto err;
4152
4153 con_driver->dev =
4154 device_create_with_groups(vtconsole_class, NULL,
4155 MKDEV(0, con_driver->node),
4156 con_driver, con_dev_groups,
4157 "vtcon%i", con_driver->node);
4158 if (IS_ERR(con_driver->dev)) {
4159 pr_warn("Unable to create device for %s; errno = %ld\n",
4160 con_driver->desc, PTR_ERR(con_driver->dev));
4161 con_driver->dev = NULL;
4162 } else {
4163 vtconsole_init_device(con_driver);
4164 }
4165
4166err:
4167 module_put(owner);
4168 return retval;
4169}
4170
4171
4172/**
4173 * do_unregister_con_driver - unregister console driver from console layer
4174 * @csw: console driver
4175 *
4176 * DESCRIPTION: All drivers that registers to the console layer must
4177 * call this function upon exit, or if the console driver is in a state
4178 * where it won't be able to handle console services, such as the
4179 * framebuffer console without loaded framebuffer drivers.
4180 *
4181 * The driver must unbind first prior to unregistration.
4182 */
4183int do_unregister_con_driver(const struct consw *csw)
4184{
4185 int i;
4186
4187 /* cannot unregister a bound driver */
4188 if (con_is_bound(csw))
4189 return -EBUSY;
4190
4191 if (csw == conswitchp)
4192 return -EINVAL;
4193
4194 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4195 struct con_driver *con_driver = ®istered_con_driver[i];
4196
4197 if (con_driver->con == csw) {
4198 /*
4199 * Defer the removal of the sysfs entries since that
4200 * will acquire the kernfs s_active lock and we can't
4201 * acquire this lock while holding the console lock:
4202 * the unbind sysfs entry imposes already the opposite
4203 * order. Reset con already here to prevent any later
4204 * lookup to succeed and mark this slot as zombie, so
4205 * it won't get reused until we complete the removal
4206 * in the deferred work.
4207 */
4208 con_driver->con = NULL;
4209 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4210 schedule_work(&con_driver_unregister_work);
4211
4212 return 0;
4213 }
4214 }
4215
4216 return -ENODEV;
4217}
4218EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4219
4220static void con_driver_unregister_callback(struct work_struct *ignored)
4221{
4222 int i;
4223
4224 console_lock();
4225
4226 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4227 struct con_driver *con_driver = ®istered_con_driver[i];
4228
4229 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4230 continue;
4231
4232 console_unlock();
4233
4234 vtconsole_deinit_device(con_driver);
4235 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4236
4237 console_lock();
4238
4239 if (WARN_ON_ONCE(con_driver->con))
4240 con_driver->con = NULL;
4241 con_driver->desc = NULL;
4242 con_driver->dev = NULL;
4243 con_driver->node = 0;
4244 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4245 con_driver->flag = 0;
4246 con_driver->first = 0;
4247 con_driver->last = 0;
4248 }
4249
4250 console_unlock();
4251}
4252
4253/*
4254 * If we support more console drivers, this function is used
4255 * when a driver wants to take over some existing consoles
4256 * and become default driver for newly opened ones.
4257 *
4258 * do_take_over_console is basically a register followed by bind
4259 */
4260int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4261{
4262 int err;
4263
4264 err = do_register_con_driver(csw, first, last);
4265 /*
4266 * If we get an busy error we still want to bind the console driver
4267 * and return success, as we may have unbound the console driver
4268 * but not unregistered it.
4269 */
4270 if (err == -EBUSY)
4271 err = 0;
4272 if (!err)
4273 do_bind_con_driver(csw, first, last, deflt);
4274
4275 return err;
4276}
4277EXPORT_SYMBOL_GPL(do_take_over_console);
4278
4279
4280/*
4281 * give_up_console is a wrapper to unregister_con_driver. It will only
4282 * work if driver is fully unbound.
4283 */
4284void give_up_console(const struct consw *csw)
4285{
4286 console_lock();
4287 do_unregister_con_driver(csw);
4288 console_unlock();
4289}
4290
4291static int __init vtconsole_class_init(void)
4292{
4293 int i;
4294
4295 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4296 if (IS_ERR(vtconsole_class)) {
4297 pr_warn("Unable to create vt console class; errno = %ld\n",
4298 PTR_ERR(vtconsole_class));
4299 vtconsole_class = NULL;
4300 }
4301
4302 /* Add system drivers to sysfs */
4303 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4304 struct con_driver *con = ®istered_con_driver[i];
4305
4306 if (con->con && !con->dev) {
4307 con->dev =
4308 device_create_with_groups(vtconsole_class, NULL,
4309 MKDEV(0, con->node),
4310 con, con_dev_groups,
4311 "vtcon%i", con->node);
4312
4313 if (IS_ERR(con->dev)) {
4314 pr_warn("Unable to create device for %s; errno = %ld\n",
4315 con->desc, PTR_ERR(con->dev));
4316 con->dev = NULL;
4317 } else {
4318 vtconsole_init_device(con);
4319 }
4320 }
4321 }
4322
4323 return 0;
4324}
4325postcore_initcall(vtconsole_class_init);
4326
4327#endif
4328
4329/*
4330 * Screen blanking
4331 */
4332
4333static int set_vesa_blanking(char __user *p)
4334{
4335 unsigned int mode;
4336
4337 if (get_user(mode, p + 1))
4338 return -EFAULT;
4339
4340 vesa_blank_mode = (mode < 4) ? mode : 0;
4341 return 0;
4342}
4343
4344void do_blank_screen(int entering_gfx)
4345{
4346 struct vc_data *vc = vc_cons[fg_console].d;
4347 int i;
4348
4349 might_sleep();
4350
4351 WARN_CONSOLE_UNLOCKED();
4352
4353 if (console_blanked) {
4354 if (blank_state == blank_vesa_wait) {
4355 blank_state = blank_off;
4356 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4357 }
4358 return;
4359 }
4360
4361 /* entering graphics mode? */
4362 if (entering_gfx) {
4363 hide_cursor(vc);
4364 save_screen(vc);
4365 vc->vc_sw->con_blank(vc, -1, 1);
4366 console_blanked = fg_console + 1;
4367 blank_state = blank_off;
4368 set_origin(vc);
4369 return;
4370 }
4371
4372 blank_state = blank_off;
4373
4374 /* don't blank graphics */
4375 if (vc->vc_mode != KD_TEXT) {
4376 console_blanked = fg_console + 1;
4377 return;
4378 }
4379
4380 hide_cursor(vc);
4381 del_timer_sync(&console_timer);
4382 blank_timer_expired = 0;
4383
4384 save_screen(vc);
4385 /* In case we need to reset origin, blanking hook returns 1 */
4386 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4387 console_blanked = fg_console + 1;
4388 if (i)
4389 set_origin(vc);
4390
4391 if (console_blank_hook && console_blank_hook(1))
4392 return;
4393
4394 if (vesa_off_interval && vesa_blank_mode) {
4395 blank_state = blank_vesa_wait;
4396 mod_timer(&console_timer, jiffies + vesa_off_interval);
4397 }
4398 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4399}
4400EXPORT_SYMBOL(do_blank_screen);
4401
4402/*
4403 * Called by timer as well as from vt_console_driver
4404 */
4405void do_unblank_screen(int leaving_gfx)
4406{
4407 struct vc_data *vc;
4408
4409 /* This should now always be called from a "sane" (read: can schedule)
4410 * context for the sake of the low level drivers, except in the special
4411 * case of oops_in_progress
4412 */
4413 if (!oops_in_progress)
4414 might_sleep();
4415
4416 WARN_CONSOLE_UNLOCKED();
4417
4418 ignore_poke = 0;
4419 if (!console_blanked)
4420 return;
4421 if (!vc_cons_allocated(fg_console)) {
4422 /* impossible */
4423 pr_warn("unblank_screen: tty %d not allocated ??\n",
4424 fg_console + 1);
4425 return;
4426 }
4427 vc = vc_cons[fg_console].d;
4428 if (vc->vc_mode != KD_TEXT)
4429 return; /* but leave console_blanked != 0 */
4430
4431 if (blankinterval) {
4432 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4433 blank_state = blank_normal_wait;
4434 }
4435
4436 console_blanked = 0;
4437 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4438 /* Low-level driver cannot restore -> do it ourselves */
4439 update_screen(vc);
4440 if (console_blank_hook)
4441 console_blank_hook(0);
4442 set_palette(vc);
4443 set_cursor(vc);
4444 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4445}
4446EXPORT_SYMBOL(do_unblank_screen);
4447
4448/*
4449 * This is called by the outside world to cause a forced unblank, mostly for
4450 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4451 * call it with 1 as an argument and so force a mode restore... that may kill
4452 * X or at least garbage the screen but would also make the Oops visible...
4453 */
4454static void unblank_screen(void)
4455{
4456 do_unblank_screen(0);
4457}
4458
4459/*
4460 * We defer the timer blanking to work queue so it can take the console mutex
4461 * (console operations can still happen at irq time, but only from printk which
4462 * has the console mutex. Not perfect yet, but better than no locking
4463 */
4464static void blank_screen_t(struct timer_list *unused)
4465{
4466 blank_timer_expired = 1;
4467 schedule_work(&console_work);
4468}
4469
4470void poke_blanked_console(void)
4471{
4472 WARN_CONSOLE_UNLOCKED();
4473
4474 /* Add this so we quickly catch whoever might call us in a non
4475 * safe context. Nowadays, unblank_screen() isn't to be called in
4476 * atomic contexts and is allowed to schedule (with the special case
4477 * of oops_in_progress, but that isn't of any concern for this
4478 * function. --BenH.
4479 */
4480 might_sleep();
4481
4482 /* This isn't perfectly race free, but a race here would be mostly harmless,
4483 * at worst, we'll do a spurious blank and it's unlikely
4484 */
4485 del_timer(&console_timer);
4486 blank_timer_expired = 0;
4487
4488 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4489 return;
4490 if (console_blanked)
4491 unblank_screen();
4492 else if (blankinterval) {
4493 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4494 blank_state = blank_normal_wait;
4495 }
4496}
4497
4498/*
4499 * Palettes
4500 */
4501
4502static void set_palette(struct vc_data *vc)
4503{
4504 WARN_CONSOLE_UNLOCKED();
4505
4506 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4507 vc->vc_sw->con_set_palette(vc, color_table);
4508}
4509
4510/*
4511 * Load palette into the DAC registers. arg points to a colour
4512 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4513 */
4514
4515int con_set_cmap(unsigned char __user *arg)
4516{
4517 int i, j, k;
4518 unsigned char colormap[3*16];
4519
4520 if (copy_from_user(colormap, arg, sizeof(colormap)))
4521 return -EFAULT;
4522
4523 console_lock();
4524 for (i = k = 0; i < 16; i++) {
4525 default_red[i] = colormap[k++];
4526 default_grn[i] = colormap[k++];
4527 default_blu[i] = colormap[k++];
4528 }
4529 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4530 if (!vc_cons_allocated(i))
4531 continue;
4532 for (j = k = 0; j < 16; j++) {
4533 vc_cons[i].d->vc_palette[k++] = default_red[j];
4534 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4535 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4536 }
4537 set_palette(vc_cons[i].d);
4538 }
4539 console_unlock();
4540
4541 return 0;
4542}
4543
4544int con_get_cmap(unsigned char __user *arg)
4545{
4546 int i, k;
4547 unsigned char colormap[3*16];
4548
4549 console_lock();
4550 for (i = k = 0; i < 16; i++) {
4551 colormap[k++] = default_red[i];
4552 colormap[k++] = default_grn[i];
4553 colormap[k++] = default_blu[i];
4554 }
4555 console_unlock();
4556
4557 if (copy_to_user(arg, colormap, sizeof(colormap)))
4558 return -EFAULT;
4559
4560 return 0;
4561}
4562
4563void reset_palette(struct vc_data *vc)
4564{
4565 int j, k;
4566 for (j=k=0; j<16; j++) {
4567 vc->vc_palette[k++] = default_red[j];
4568 vc->vc_palette[k++] = default_grn[j];
4569 vc->vc_palette[k++] = default_blu[j];
4570 }
4571 set_palette(vc);
4572}
4573
4574/*
4575 * Font switching
4576 *
4577 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4578 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4579 * depending on width) reserved for each character which is kinda wasty, but
4580 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4581 * is up to the actual low-level console-driver convert data into its favorite
4582 * format (maybe we should add a `fontoffset' field to the `display'
4583 * structure so we won't have to convert the fontdata all the time.
4584 * /Jes
4585 */
4586
4587#define max_font_size 65536
4588
4589static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4590{
4591 struct console_font font;
4592 int rc = -EINVAL;
4593 int c;
4594
4595 if (op->data) {
4596 font.data = kmalloc(max_font_size, GFP_KERNEL);
4597 if (!font.data)
4598 return -ENOMEM;
4599 } else
4600 font.data = NULL;
4601
4602 console_lock();
4603 if (vc->vc_mode != KD_TEXT)
4604 rc = -EINVAL;
4605 else if (vc->vc_sw->con_font_get)
4606 rc = vc->vc_sw->con_font_get(vc, &font);
4607 else
4608 rc = -ENOSYS;
4609 console_unlock();
4610
4611 if (rc)
4612 goto out;
4613
4614 c = (font.width+7)/8 * 32 * font.charcount;
4615
4616 if (op->data && font.charcount > op->charcount)
4617 rc = -ENOSPC;
4618 if (font.width > op->width || font.height > op->height)
4619 rc = -ENOSPC;
4620 if (rc)
4621 goto out;
4622
4623 op->height = font.height;
4624 op->width = font.width;
4625 op->charcount = font.charcount;
4626
4627 if (op->data && copy_to_user(op->data, font.data, c))
4628 rc = -EFAULT;
4629
4630out:
4631 kfree(font.data);
4632 return rc;
4633}
4634
4635static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4636{
4637 struct console_font font;
4638 int rc = -EINVAL;
4639 int size;
4640
4641 if (vc->vc_mode != KD_TEXT)
4642 return -EINVAL;
4643 if (!op->data)
4644 return -EINVAL;
4645 if (op->charcount > 512)
4646 return -EINVAL;
4647 if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
4648 return -EINVAL;
4649 size = (op->width+7)/8 * 32 * op->charcount;
4650 if (size > max_font_size)
4651 return -ENOSPC;
4652
4653 font.data = memdup_user(op->data, size);
4654 if (IS_ERR(font.data))
4655 return PTR_ERR(font.data);
4656
4657 font.charcount = op->charcount;
4658 font.width = op->width;
4659 font.height = op->height;
4660
4661 console_lock();
4662 if (vc->vc_mode != KD_TEXT)
4663 rc = -EINVAL;
4664 else if (vc->vc_sw->con_font_set) {
4665 if (vc_is_sel(vc))
4666 clear_selection();
4667 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4668 } else
4669 rc = -ENOSYS;
4670 console_unlock();
4671 kfree(font.data);
4672 return rc;
4673}
4674
4675static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4676{
4677 struct console_font font = {.width = op->width, .height = op->height};
4678 char name[MAX_FONT_NAME];
4679 char *s = name;
4680 int rc;
4681
4682
4683 if (!op->data)
4684 s = NULL;
4685 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4686 return -EFAULT;
4687 else
4688 name[MAX_FONT_NAME - 1] = 0;
4689
4690 console_lock();
4691 if (vc->vc_mode != KD_TEXT) {
4692 console_unlock();
4693 return -EINVAL;
4694 }
4695 if (vc->vc_sw->con_font_default) {
4696 if (vc_is_sel(vc))
4697 clear_selection();
4698 rc = vc->vc_sw->con_font_default(vc, &font, s);
4699 } else
4700 rc = -ENOSYS;
4701 console_unlock();
4702 if (!rc) {
4703 op->width = font.width;
4704 op->height = font.height;
4705 }
4706 return rc;
4707}
4708
4709int con_font_op(struct vc_data *vc, struct console_font_op *op)
4710{
4711 switch (op->op) {
4712 case KD_FONT_OP_SET:
4713 return con_font_set(vc, op);
4714 case KD_FONT_OP_GET:
4715 return con_font_get(vc, op);
4716 case KD_FONT_OP_SET_DEFAULT:
4717 return con_font_default(vc, op);
4718 case KD_FONT_OP_COPY:
4719 /* was buggy and never really used */
4720 return -EINVAL;
4721 }
4722 return -ENOSYS;
4723}
4724
4725/*
4726 * Interface exported to selection and vcs.
4727 */
4728
4729/* used by selection */
4730u16 screen_glyph(const struct vc_data *vc, int offset)
4731{
4732 u16 w = scr_readw(screenpos(vc, offset, true));
4733 u16 c = w & 0xff;
4734
4735 if (w & vc->vc_hi_font_mask)
4736 c |= 0x100;
4737 return c;
4738}
4739EXPORT_SYMBOL_GPL(screen_glyph);
4740
4741u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4742{
4743 struct uni_screen *uniscr = get_vc_uniscr(vc);
4744
4745 if (uniscr)
4746 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4747 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4748}
4749EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4750
4751/* used by vcs - note the word offset */
4752unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4753{
4754 return screenpos(vc, 2 * w_offset, viewed);
4755}
4756EXPORT_SYMBOL_GPL(screen_pos);
4757
4758void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4759{
4760 /* clamp values if they don't fit */
4761 xy[0] = min(vc->state.x, 0xFFu);
4762 xy[1] = min(vc->state.y, 0xFFu);
4763}
4764
4765void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4766{
4767 hide_cursor(vc);
4768 gotoxy(vc, xy[0], xy[1]);
4769 set_cursor(vc);
4770}
4771
4772u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4773{
4774 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4775 return softcursor_original;
4776 return scr_readw(org);
4777}
4778
4779void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4780{
4781 scr_writew(val, org);
4782 if ((unsigned long)org == vc->vc_pos) {
4783 softcursor_original = -1;
4784 add_softcursor(vc);
4785 }
4786}
4787
4788void vcs_scr_updated(struct vc_data *vc)
4789{
4790 notify_update(vc);
4791}
4792
4793void vc_scrolldelta_helper(struct vc_data *c, int lines,
4794 unsigned int rolled_over, void *base, unsigned int size)
4795{
4796 unsigned long ubase = (unsigned long)base;
4797 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4798 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4799 ptrdiff_t origin = (void *)c->vc_origin - base;
4800 int margin = c->vc_size_row * 4;
4801 int from, wrap, from_off, avail;
4802
4803 /* Turn scrollback off */
4804 if (!lines) {
4805 c->vc_visible_origin = c->vc_origin;
4806 return;
4807 }
4808
4809 /* Do we have already enough to allow jumping from 0 to the end? */
4810 if (rolled_over > scr_end + margin) {
4811 from = scr_end;
4812 wrap = rolled_over + c->vc_size_row;
4813 } else {
4814 from = 0;
4815 wrap = size;
4816 }
4817
4818 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4819 avail = (origin - from + wrap) % wrap;
4820
4821 /* Only a little piece would be left? Show all incl. the piece! */
4822 if (avail < 2 * margin)
4823 margin = 0;
4824 if (from_off < margin)
4825 from_off = 0;
4826 if (from_off > avail - margin)
4827 from_off = avail;
4828
4829 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4830}
4831EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4832
4833/*
4834 * Visible symbols for modules
4835 */
4836
4837EXPORT_SYMBOL(color_table);
4838EXPORT_SYMBOL(default_red);
4839EXPORT_SYMBOL(default_grn);
4840EXPORT_SYMBOL(default_blu);
4841EXPORT_SYMBOL(update_region);
4842EXPORT_SYMBOL(redraw_screen);
4843EXPORT_SYMBOL(vc_resize);
4844EXPORT_SYMBOL(fg_console);
4845EXPORT_SYMBOL(console_blank_hook);
4846EXPORT_SYMBOL(console_blanked);
4847EXPORT_SYMBOL(vc_cons);
4848EXPORT_SYMBOL(global_cursor_default);
4849#ifndef VT_SINGLE_DRIVER
4850EXPORT_SYMBOL(give_up_console);
4851#endif