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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/major.h>
85#include <linux/mm.h>
86#include <linux/console.h>
87#include <linux/init.h>
88#include <linux/mutex.h>
89#include <linux/vt_kern.h>
90#include <linux/selection.h>
91#include <linux/tiocl.h>
92#include <linux/kbd_kern.h>
93#include <linux/consolemap.h>
94#include <linux/timer.h>
95#include <linux/interrupt.h>
96#include <linux/workqueue.h>
97#include <linux/pm.h>
98#include <linux/font.h>
99#include <linux/bitops.h>
100#include <linux/notifier.h>
101#include <linux/device.h>
102#include <linux/io.h>
103#include <linux/uaccess.h>
104#include <linux/kdb.h>
105#include <linux/ctype.h>
106#include <linux/bsearch.h>
107
108#define MAX_NR_CON_DRIVER 16
109
110#define CON_DRIVER_FLAG_MODULE 1
111#define CON_DRIVER_FLAG_INIT 2
112#define CON_DRIVER_FLAG_ATTR 4
113#define CON_DRIVER_FLAG_ZOMBIE 8
114
115struct con_driver {
116 const struct consw *con;
117 const char *desc;
118 struct device *dev;
119 int node;
120 int first;
121 int last;
122 int flag;
123};
124
125static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
126const struct consw *conswitchp;
127
128/* A bitmap for codes <32. A bit of 1 indicates that the code
129 * corresponding to that bit number invokes some special action
130 * (such as cursor movement) and should not be displayed as a
131 * glyph unless the disp_ctrl mode is explicitly enabled.
132 */
133#define CTRL_ACTION 0x0d00ff81
134#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
135
136/*
137 * Here is the default bell parameters: 750HZ, 1/8th of a second
138 */
139#define DEFAULT_BELL_PITCH 750
140#define DEFAULT_BELL_DURATION (HZ/8)
141#define DEFAULT_CURSOR_BLINK_MS 200
142
143struct vc vc_cons [MAX_NR_CONSOLES];
144
145#ifndef VT_SINGLE_DRIVER
146static const struct consw *con_driver_map[MAX_NR_CONSOLES];
147#endif
148
149static int con_open(struct tty_struct *, struct file *);
150static void vc_init(struct vc_data *vc, unsigned int rows,
151 unsigned int cols, int do_clear);
152static void gotoxy(struct vc_data *vc, int new_x, int new_y);
153static void save_cur(struct vc_data *vc);
154static void reset_terminal(struct vc_data *vc, int do_clear);
155static void con_flush_chars(struct tty_struct *tty);
156static int set_vesa_blanking(char __user *p);
157static void set_cursor(struct vc_data *vc);
158static void hide_cursor(struct vc_data *vc);
159static void console_callback(struct work_struct *ignored);
160static void con_driver_unregister_callback(struct work_struct *ignored);
161static void blank_screen_t(struct timer_list *unused);
162static void set_palette(struct vc_data *vc);
163
164#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
165
166static int printable; /* Is console ready for printing? */
167int default_utf8 = true;
168module_param(default_utf8, int, S_IRUGO | S_IWUSR);
169int global_cursor_default = -1;
170module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
171
172static int cur_default = CUR_DEFAULT;
173module_param(cur_default, int, S_IRUGO | S_IWUSR);
174
175/*
176 * ignore_poke: don't unblank the screen when things are typed. This is
177 * mainly for the privacy of braille terminal users.
178 */
179static int ignore_poke;
180
181int do_poke_blanked_console;
182int console_blanked;
183
184static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
185static int vesa_off_interval;
186static int blankinterval;
187core_param(consoleblank, blankinterval, int, 0444);
188
189static DECLARE_WORK(console_work, console_callback);
190static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
191
192/*
193 * fg_console is the current virtual console,
194 * last_console is the last used one,
195 * want_console is the console we want to switch to,
196 * saved_* variants are for save/restore around kernel debugger enter/leave
197 */
198int fg_console;
199int last_console;
200int want_console = -1;
201static int saved_fg_console;
202static int saved_last_console;
203static int saved_want_console;
204static int saved_vc_mode;
205static int saved_console_blanked;
206
207/*
208 * For each existing display, we have a pointer to console currently visible
209 * on that display, allowing consoles other than fg_console to be refreshed
210 * appropriately. Unless the low-level driver supplies its own display_fg
211 * variable, we use this one for the "master display".
212 */
213static struct vc_data *master_display_fg;
214
215/*
216 * Unfortunately, we need to delay tty echo when we're currently writing to the
217 * console since the code is (and always was) not re-entrant, so we schedule
218 * all flip requests to process context with schedule-task() and run it from
219 * console_callback().
220 */
221
222/*
223 * For the same reason, we defer scrollback to the console callback.
224 */
225static int scrollback_delta;
226
227/*
228 * Hook so that the power management routines can (un)blank
229 * the console on our behalf.
230 */
231int (*console_blank_hook)(int);
232
233static DEFINE_TIMER(console_timer, blank_screen_t);
234static int blank_state;
235static int blank_timer_expired;
236enum {
237 blank_off = 0,
238 blank_normal_wait,
239 blank_vesa_wait,
240};
241
242/*
243 * /sys/class/tty/tty0/
244 *
245 * the attribute 'active' contains the name of the current vc
246 * console and it supports poll() to detect vc switches
247 */
248static struct device *tty0dev;
249
250/*
251 * Notifier list for console events.
252 */
253static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
254
255int register_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_register(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(register_vt_notifier);
260
261int unregister_vt_notifier(struct notifier_block *nb)
262{
263 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
264}
265EXPORT_SYMBOL_GPL(unregister_vt_notifier);
266
267static void notify_write(struct vc_data *vc, unsigned int unicode)
268{
269 struct vt_notifier_param param = { .vc = vc, .c = unicode };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m);
271}
272
273static void notify_update(struct vc_data *vc)
274{
275 struct vt_notifier_param param = { .vc = vc };
276 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m);
277}
278/*
279 * Low-Level Functions
280 */
281
282static inline bool con_is_fg(const struct vc_data *vc)
283{
284 return vc->vc_num == fg_console;
285}
286
287static inline bool con_should_update(const struct vc_data *vc)
288{
289 return con_is_visible(vc) && !console_blanked;
290}
291
292static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
293{
294 unsigned short *p;
295
296 if (!viewed)
297 p = (unsigned short *)(vc->vc_origin + offset);
298 else if (!vc->vc_sw->con_screen_pos)
299 p = (unsigned short *)(vc->vc_visible_origin + offset);
300 else
301 p = vc->vc_sw->con_screen_pos(vc, offset);
302 return p;
303}
304
305/* Called from the keyboard irq path.. */
306static inline void scrolldelta(int lines)
307{
308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
311 scrollback_delta += lines;
312 schedule_console_callback();
313}
314
315void schedule_console_callback(void)
316{
317 schedule_work(&console_work);
318}
319
320static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
321 enum con_scroll dir, unsigned int nr)
322{
323 u16 *clear, *d, *s;
324
325 if (t + nr >= b)
326 nr = b - t - 1;
327 if (b > vc->vc_rows || t >= b || nr < 1)
328 return;
329 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
330 return;
331
332 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
333 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
334
335 if (dir == SM_UP) {
336 clear = s + (b - t - nr) * vc->vc_cols;
337 swap(s, d);
338 }
339 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
340 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
341}
342
343static void do_update_region(struct vc_data *vc, unsigned long start, int count)
344{
345 unsigned int xx, yy, offset;
346 u16 *p;
347
348 p = (u16 *) start;
349 if (!vc->vc_sw->con_getxy) {
350 offset = (start - vc->vc_origin) / 2;
351 xx = offset % vc->vc_cols;
352 yy = offset / vc->vc_cols;
353 } else {
354 int nxx, nyy;
355 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
356 xx = nxx; yy = nyy;
357 }
358 for(;;) {
359 u16 attrib = scr_readw(p) & 0xff00;
360 int startx = xx;
361 u16 *q = p;
362 while (xx < vc->vc_cols && count) {
363 if (attrib != (scr_readw(p) & 0xff00)) {
364 if (p > q)
365 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
366 startx = xx;
367 q = p;
368 attrib = scr_readw(p) & 0xff00;
369 }
370 p++;
371 xx++;
372 count--;
373 }
374 if (p > q)
375 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
376 if (!count)
377 break;
378 xx = 0;
379 yy++;
380 if (vc->vc_sw->con_getxy) {
381 p = (u16 *)start;
382 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
383 }
384 }
385}
386
387void update_region(struct vc_data *vc, unsigned long start, int count)
388{
389 WARN_CONSOLE_UNLOCKED();
390
391 if (con_should_update(vc)) {
392 hide_cursor(vc);
393 do_update_region(vc, start, count);
394 set_cursor(vc);
395 }
396}
397
398/* Structure of attributes is hardware-dependent */
399
400static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
401 u8 _underline, u8 _reverse, u8 _italic)
402{
403 if (vc->vc_sw->con_build_attr)
404 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
405 _blink, _underline, _reverse, _italic);
406
407/*
408 * ++roman: I completely changed the attribute format for monochrome
409 * mode (!can_do_color). The formerly used MDA (monochrome display
410 * adapter) format didn't allow the combination of certain effects.
411 * Now the attribute is just a bit vector:
412 * Bit 0..1: intensity (0..2)
413 * Bit 2 : underline
414 * Bit 3 : reverse
415 * Bit 7 : blink
416 */
417 {
418 u8 a = _color;
419 if (!vc->vc_can_do_color)
420 return _intensity |
421 (_italic ? 2 : 0) |
422 (_underline ? 4 : 0) |
423 (_reverse ? 8 : 0) |
424 (_blink ? 0x80 : 0);
425 if (_italic)
426 a = (a & 0xF0) | vc->vc_itcolor;
427 else if (_underline)
428 a = (a & 0xf0) | vc->vc_ulcolor;
429 else if (_intensity == 0)
430 a = (a & 0xf0) | vc->vc_halfcolor;
431 if (_reverse)
432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
433 if (_blink)
434 a ^= 0x80;
435 if (_intensity == 2)
436 a ^= 0x08;
437 if (vc->vc_hi_font_mask == 0x100)
438 a <<= 1;
439 return a;
440 }
441}
442
443static void update_attr(struct vc_data *vc)
444{
445 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
446 vc->vc_blink, vc->vc_underline,
447 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
448 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
449}
450
451/* Note: inverting the screen twice should revert to the original state */
452void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
453{
454 unsigned short *p;
455
456 WARN_CONSOLE_UNLOCKED();
457
458 count /= 2;
459 p = screenpos(vc, offset, viewed);
460 if (vc->vc_sw->con_invert_region) {
461 vc->vc_sw->con_invert_region(vc, p, count);
462 } else {
463 u16 *q = p;
464 int cnt = count;
465 u16 a;
466
467 if (!vc->vc_can_do_color) {
468 while (cnt--) {
469 a = scr_readw(q);
470 a ^= 0x0800;
471 scr_writew(a, q);
472 q++;
473 }
474 } else if (vc->vc_hi_font_mask == 0x100) {
475 while (cnt--) {
476 a = scr_readw(q);
477 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
478 scr_writew(a, q);
479 q++;
480 }
481 } else {
482 while (cnt--) {
483 a = scr_readw(q);
484 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
485 scr_writew(a, q);
486 q++;
487 }
488 }
489 }
490
491 if (con_should_update(vc))
492 do_update_region(vc, (unsigned long) p, count);
493 notify_update(vc);
494}
495
496/* used by selection: complement pointer position */
497void complement_pos(struct vc_data *vc, int offset)
498{
499 static int old_offset = -1;
500 static unsigned short old;
501 static unsigned short oldx, oldy;
502
503 WARN_CONSOLE_UNLOCKED();
504
505 if (old_offset != -1 && old_offset >= 0 &&
506 old_offset < vc->vc_screenbuf_size) {
507 scr_writew(old, screenpos(vc, old_offset, 1));
508 if (con_should_update(vc))
509 vc->vc_sw->con_putc(vc, old, oldy, oldx);
510 notify_update(vc);
511 }
512
513 old_offset = offset;
514
515 if (offset != -1 && offset >= 0 &&
516 offset < vc->vc_screenbuf_size) {
517 unsigned short new;
518 unsigned short *p;
519 p = screenpos(vc, offset, 1);
520 old = scr_readw(p);
521 new = old ^ vc->vc_complement_mask;
522 scr_writew(new, p);
523 if (con_should_update(vc)) {
524 oldx = (offset >> 1) % vc->vc_cols;
525 oldy = (offset >> 1) / vc->vc_cols;
526 vc->vc_sw->con_putc(vc, new, oldy, oldx);
527 }
528 notify_update(vc);
529 }
530}
531
532static void insert_char(struct vc_data *vc, unsigned int nr)
533{
534 unsigned short *p = (unsigned short *) vc->vc_pos;
535
536 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
537 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
538 vc->vc_need_wrap = 0;
539 if (con_should_update(vc))
540 do_update_region(vc, (unsigned long) p,
541 vc->vc_cols - vc->vc_x);
542}
543
544static void delete_char(struct vc_data *vc, unsigned int nr)
545{
546 unsigned short *p = (unsigned short *) vc->vc_pos;
547
548 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
549 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
550 nr * 2);
551 vc->vc_need_wrap = 0;
552 if (con_should_update(vc))
553 do_update_region(vc, (unsigned long) p,
554 vc->vc_cols - vc->vc_x);
555}
556
557static int softcursor_original = -1;
558
559static void add_softcursor(struct vc_data *vc)
560{
561 int i = scr_readw((u16 *) vc->vc_pos);
562 u32 type = vc->vc_cursor_type;
563
564 if (! (type & 0x10)) return;
565 if (softcursor_original != -1) return;
566 softcursor_original = i;
567 i |= ((type >> 8) & 0xff00 );
568 i ^= ((type) & 0xff00 );
569 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
570 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
571 scr_writew(i, (u16 *) vc->vc_pos);
572 if (con_should_update(vc))
573 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
574}
575
576static void hide_softcursor(struct vc_data *vc)
577{
578 if (softcursor_original != -1) {
579 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
580 if (con_should_update(vc))
581 vc->vc_sw->con_putc(vc, softcursor_original,
582 vc->vc_y, vc->vc_x);
583 softcursor_original = -1;
584 }
585}
586
587static void hide_cursor(struct vc_data *vc)
588{
589 if (vc == sel_cons)
590 clear_selection();
591 vc->vc_sw->con_cursor(vc, CM_ERASE);
592 hide_softcursor(vc);
593}
594
595static void set_cursor(struct vc_data *vc)
596{
597 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
598 return;
599 if (vc->vc_deccm) {
600 if (vc == sel_cons)
601 clear_selection();
602 add_softcursor(vc);
603 if ((vc->vc_cursor_type & 0x0f) != 1)
604 vc->vc_sw->con_cursor(vc, CM_DRAW);
605 } else
606 hide_cursor(vc);
607}
608
609static void set_origin(struct vc_data *vc)
610{
611 WARN_CONSOLE_UNLOCKED();
612
613 if (!con_is_visible(vc) ||
614 !vc->vc_sw->con_set_origin ||
615 !vc->vc_sw->con_set_origin(vc))
616 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
617 vc->vc_visible_origin = vc->vc_origin;
618 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
619 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
620}
621
622static void save_screen(struct vc_data *vc)
623{
624 WARN_CONSOLE_UNLOCKED();
625
626 if (vc->vc_sw->con_save_screen)
627 vc->vc_sw->con_save_screen(vc);
628}
629
630static void flush_scrollback(struct vc_data *vc)
631{
632 WARN_CONSOLE_UNLOCKED();
633
634 if (vc->vc_sw->con_flush_scrollback)
635 vc->vc_sw->con_flush_scrollback(vc);
636}
637
638/*
639 * Redrawing of screen
640 */
641
642void clear_buffer_attributes(struct vc_data *vc)
643{
644 unsigned short *p = (unsigned short *)vc->vc_origin;
645 int count = vc->vc_screenbuf_size / 2;
646 int mask = vc->vc_hi_font_mask | 0xff;
647
648 for (; count > 0; count--, p++) {
649 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
650 }
651}
652
653void redraw_screen(struct vc_data *vc, int is_switch)
654{
655 int redraw = 0;
656
657 WARN_CONSOLE_UNLOCKED();
658
659 if (!vc) {
660 /* strange ... */
661 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
662 return;
663 }
664
665 if (is_switch) {
666 struct vc_data *old_vc = vc_cons[fg_console].d;
667 if (old_vc == vc)
668 return;
669 if (!con_is_visible(vc))
670 redraw = 1;
671 *vc->vc_display_fg = vc;
672 fg_console = vc->vc_num;
673 hide_cursor(old_vc);
674 if (!con_is_visible(old_vc)) {
675 save_screen(old_vc);
676 set_origin(old_vc);
677 }
678 if (tty0dev)
679 sysfs_notify(&tty0dev->kobj, NULL, "active");
680 } else {
681 hide_cursor(vc);
682 redraw = 1;
683 }
684
685 if (redraw) {
686 int update;
687 int old_was_color = vc->vc_can_do_color;
688
689 set_origin(vc);
690 update = vc->vc_sw->con_switch(vc);
691 set_palette(vc);
692 /*
693 * If console changed from mono<->color, the best we can do
694 * is to clear the buffer attributes. As it currently stands,
695 * rebuilding new attributes from the old buffer is not doable
696 * without overly complex code.
697 */
698 if (old_was_color != vc->vc_can_do_color) {
699 update_attr(vc);
700 clear_buffer_attributes(vc);
701 }
702
703 /* Forcibly update if we're panicing */
704 if ((update && vc->vc_mode != KD_GRAPHICS) ||
705 vt_force_oops_output(vc))
706 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
707 }
708 set_cursor(vc);
709 if (is_switch) {
710 set_leds();
711 compute_shiftstate();
712 notify_update(vc);
713 }
714}
715
716/*
717 * Allocation, freeing and resizing of VTs.
718 */
719
720int vc_cons_allocated(unsigned int i)
721{
722 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
723}
724
725static void visual_init(struct vc_data *vc, int num, int init)
726{
727 /* ++Geert: vc->vc_sw->con_init determines console size */
728 if (vc->vc_sw)
729 module_put(vc->vc_sw->owner);
730 vc->vc_sw = conswitchp;
731#ifndef VT_SINGLE_DRIVER
732 if (con_driver_map[num])
733 vc->vc_sw = con_driver_map[num];
734#endif
735 __module_get(vc->vc_sw->owner);
736 vc->vc_num = num;
737 vc->vc_display_fg = &master_display_fg;
738 if (vc->vc_uni_pagedir_loc)
739 con_free_unimap(vc);
740 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
741 vc->vc_uni_pagedir = NULL;
742 vc->vc_hi_font_mask = 0;
743 vc->vc_complement_mask = 0;
744 vc->vc_can_do_color = 0;
745 vc->vc_panic_force_write = false;
746 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
747 vc->vc_sw->con_init(vc, init);
748 if (!vc->vc_complement_mask)
749 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
750 vc->vc_s_complement_mask = vc->vc_complement_mask;
751 vc->vc_size_row = vc->vc_cols << 1;
752 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
753}
754
755int vc_allocate(unsigned int currcons) /* return 0 on success */
756{
757 struct vt_notifier_param param;
758 struct vc_data *vc;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 if (currcons >= MAX_NR_CONSOLES)
763 return -ENXIO;
764
765 if (vc_cons[currcons].d)
766 return 0;
767
768 /* due to the granularity of kmalloc, we waste some memory here */
769 /* the alloc is done in two steps, to optimize the common situation
770 of a 25x80 console (structsize=216, screenbuf_size=4000) */
771 /* although the numbers above are not valid since long ago, the
772 point is still up-to-date and the comment still has its value
773 even if only as a historical artifact. --mj, July 1998 */
774 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
775 if (!vc)
776 return -ENOMEM;
777
778 vc_cons[currcons].d = vc;
779 tty_port_init(&vc->port);
780 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
781
782 visual_init(vc, currcons, 1);
783
784 if (!*vc->vc_uni_pagedir_loc)
785 con_set_default_unimap(vc);
786
787 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
788 if (!vc->vc_screenbuf)
789 goto err_free;
790
791 /* If no drivers have overridden us and the user didn't pass a
792 boot option, default to displaying the cursor */
793 if (global_cursor_default == -1)
794 global_cursor_default = 1;
795
796 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
797 vcs_make_sysfs(currcons);
798 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m);
799
800 return 0;
801err_free:
802 kfree(vc);
803 vc_cons[currcons].d = NULL;
804 return -ENOMEM;
805}
806
807static inline int resize_screen(struct vc_data *vc, int width, int height,
808 int user)
809{
810 /* Resizes the resolution of the display adapater */
811 int err = 0;
812
813 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
814 err = vc->vc_sw->con_resize(vc, width, height, user);
815
816 return err;
817}
818
819/*
820 * Change # of rows and columns (0 means unchanged/the size of fg_console)
821 * [this is to be used together with some user program
822 * like resize that changes the hardware videomode]
823 */
824#define VC_RESIZE_MAXCOL (32767)
825#define VC_RESIZE_MAXROW (32767)
826
827/**
828 * vc_do_resize - resizing method for the tty
829 * @tty: tty being resized
830 * @real_tty: real tty (different to tty if a pty/tty pair)
831 * @vc: virtual console private data
832 * @cols: columns
833 * @lines: lines
834 *
835 * Resize a virtual console, clipping according to the actual constraints.
836 * If the caller passes a tty structure then update the termios winsize
837 * information and perform any necessary signal handling.
838 *
839 * Caller must hold the console semaphore. Takes the termios rwsem and
840 * ctrl_lock of the tty IFF a tty is passed.
841 */
842
843static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
844 unsigned int cols, unsigned int lines)
845{
846 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
847 unsigned long end;
848 unsigned int old_rows, old_row_size;
849 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
850 unsigned int user;
851 unsigned short *newscreen;
852
853 WARN_CONSOLE_UNLOCKED();
854
855 if (!vc)
856 return -ENXIO;
857
858 user = vc->vc_resize_user;
859 vc->vc_resize_user = 0;
860
861 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
862 return -EINVAL;
863
864 new_cols = (cols ? cols : vc->vc_cols);
865 new_rows = (lines ? lines : vc->vc_rows);
866 new_row_size = new_cols << 1;
867 new_screen_size = new_row_size * new_rows;
868
869 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
870 return 0;
871
872 if (new_screen_size > (4 << 20))
873 return -EINVAL;
874 newscreen = kmalloc(new_screen_size, GFP_USER);
875 if (!newscreen)
876 return -ENOMEM;
877
878 if (vc == sel_cons)
879 clear_selection();
880
881 old_rows = vc->vc_rows;
882 old_row_size = vc->vc_size_row;
883
884 err = resize_screen(vc, new_cols, new_rows, user);
885 if (err) {
886 kfree(newscreen);
887 return err;
888 }
889
890 vc->vc_rows = new_rows;
891 vc->vc_cols = new_cols;
892 vc->vc_size_row = new_row_size;
893 vc->vc_screenbuf_size = new_screen_size;
894
895 rlth = min(old_row_size, new_row_size);
896 rrem = new_row_size - rlth;
897 old_origin = vc->vc_origin;
898 new_origin = (long) newscreen;
899 new_scr_end = new_origin + new_screen_size;
900
901 if (vc->vc_y > new_rows) {
902 if (old_rows - vc->vc_y < new_rows) {
903 /*
904 * Cursor near the bottom, copy contents from the
905 * bottom of buffer
906 */
907 old_origin += (old_rows - new_rows) * old_row_size;
908 } else {
909 /*
910 * Cursor is in no man's land, copy 1/2 screenful
911 * from the top and bottom of cursor position
912 */
913 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
914 }
915 }
916
917 end = old_origin + old_row_size * min(old_rows, new_rows);
918
919 update_attr(vc);
920
921 while (old_origin < end) {
922 scr_memcpyw((unsigned short *) new_origin,
923 (unsigned short *) old_origin, rlth);
924 if (rrem)
925 scr_memsetw((void *)(new_origin + rlth),
926 vc->vc_video_erase_char, rrem);
927 old_origin += old_row_size;
928 new_origin += new_row_size;
929 }
930 if (new_scr_end > new_origin)
931 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
932 new_scr_end - new_origin);
933 kfree(vc->vc_screenbuf);
934 vc->vc_screenbuf = newscreen;
935 vc->vc_screenbuf_size = new_screen_size;
936 set_origin(vc);
937
938 /* do part of a reset_terminal() */
939 vc->vc_top = 0;
940 vc->vc_bottom = vc->vc_rows;
941 gotoxy(vc, vc->vc_x, vc->vc_y);
942 save_cur(vc);
943
944 if (tty) {
945 /* Rewrite the requested winsize data with the actual
946 resulting sizes */
947 struct winsize ws;
948 memset(&ws, 0, sizeof(ws));
949 ws.ws_row = vc->vc_rows;
950 ws.ws_col = vc->vc_cols;
951 ws.ws_ypixel = vc->vc_scan_lines;
952 tty_do_resize(tty, &ws);
953 }
954
955 if (con_is_visible(vc))
956 update_screen(vc);
957 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
958 return err;
959}
960
961/**
962 * vc_resize - resize a VT
963 * @vc: virtual console
964 * @cols: columns
965 * @rows: rows
966 *
967 * Resize a virtual console as seen from the console end of things. We
968 * use the common vc_do_resize methods to update the structures. The
969 * caller must hold the console sem to protect console internals and
970 * vc->port.tty
971 */
972
973int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
974{
975 return vc_do_resize(vc->port.tty, vc, cols, rows);
976}
977
978/**
979 * vt_resize - resize a VT
980 * @tty: tty to resize
981 * @ws: winsize attributes
982 *
983 * Resize a virtual terminal. This is called by the tty layer as we
984 * register our own handler for resizing. The mutual helper does all
985 * the actual work.
986 *
987 * Takes the console sem and the called methods then take the tty
988 * termios_rwsem and the tty ctrl_lock in that order.
989 */
990static int vt_resize(struct tty_struct *tty, struct winsize *ws)
991{
992 struct vc_data *vc = tty->driver_data;
993 int ret;
994
995 console_lock();
996 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
997 console_unlock();
998 return ret;
999}
1000
1001struct vc_data *vc_deallocate(unsigned int currcons)
1002{
1003 struct vc_data *vc = NULL;
1004
1005 WARN_CONSOLE_UNLOCKED();
1006
1007 if (vc_cons_allocated(currcons)) {
1008 struct vt_notifier_param param;
1009
1010 param.vc = vc = vc_cons[currcons].d;
1011 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m);
1012 vcs_remove_sysfs(currcons);
1013 vc->vc_sw->con_deinit(vc);
1014 put_pid(vc->vt_pid);
1015 module_put(vc->vc_sw->owner);
1016 kfree(vc->vc_screenbuf);
1017 vc_cons[currcons].d = NULL;
1018 }
1019 return vc;
1020}
1021
1022/*
1023 * VT102 emulator
1024 */
1025
1026#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1027#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1028#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1029
1030#define decarm VC_REPEAT
1031#define decckm VC_CKMODE
1032#define kbdapplic VC_APPLIC
1033#define lnm VC_CRLF
1034
1035/*
1036 * this is what the terminal answers to a ESC-Z or csi0c query.
1037 */
1038#define VT100ID "\033[?1;2c"
1039#define VT102ID "\033[?6c"
1040
1041const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1042 8,12,10,14, 9,13,11,15 };
1043
1044/* the default colour table, for VGA+ colour systems */
1045unsigned char default_red[] = {
1046 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1047 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1048};
1049module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1050
1051unsigned char default_grn[] = {
1052 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1053 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1054};
1055module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1056
1057unsigned char default_blu[] = {
1058 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1059 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1060};
1061module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1062
1063/*
1064 * gotoxy() must verify all boundaries, because the arguments
1065 * might also be negative. If the given position is out of
1066 * bounds, the cursor is placed at the nearest margin.
1067 */
1068static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1069{
1070 int min_y, max_y;
1071
1072 if (new_x < 0)
1073 vc->vc_x = 0;
1074 else {
1075 if (new_x >= vc->vc_cols)
1076 vc->vc_x = vc->vc_cols - 1;
1077 else
1078 vc->vc_x = new_x;
1079 }
1080
1081 if (vc->vc_decom) {
1082 min_y = vc->vc_top;
1083 max_y = vc->vc_bottom;
1084 } else {
1085 min_y = 0;
1086 max_y = vc->vc_rows;
1087 }
1088 if (new_y < min_y)
1089 vc->vc_y = min_y;
1090 else if (new_y >= max_y)
1091 vc->vc_y = max_y - 1;
1092 else
1093 vc->vc_y = new_y;
1094 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1095 vc->vc_need_wrap = 0;
1096}
1097
1098/* for absolute user moves, when decom is set */
1099static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1100{
1101 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1102}
1103
1104void scrollback(struct vc_data *vc)
1105{
1106 scrolldelta(-(vc->vc_rows / 2));
1107}
1108
1109void scrollfront(struct vc_data *vc, int lines)
1110{
1111 if (!lines)
1112 lines = vc->vc_rows / 2;
1113 scrolldelta(lines);
1114}
1115
1116static void lf(struct vc_data *vc)
1117{
1118 /* don't scroll if above bottom of scrolling region, or
1119 * if below scrolling region
1120 */
1121 if (vc->vc_y + 1 == vc->vc_bottom)
1122 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1123 else if (vc->vc_y < vc->vc_rows - 1) {
1124 vc->vc_y++;
1125 vc->vc_pos += vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
1128 notify_write(vc, '\n');
1129}
1130
1131static void ri(struct vc_data *vc)
1132{
1133 /* don't scroll if below top of scrolling region, or
1134 * if above scrolling region
1135 */
1136 if (vc->vc_y == vc->vc_top)
1137 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1138 else if (vc->vc_y > 0) {
1139 vc->vc_y--;
1140 vc->vc_pos -= vc->vc_size_row;
1141 }
1142 vc->vc_need_wrap = 0;
1143}
1144
1145static inline void cr(struct vc_data *vc)
1146{
1147 vc->vc_pos -= vc->vc_x << 1;
1148 vc->vc_need_wrap = vc->vc_x = 0;
1149 notify_write(vc, '\r');
1150}
1151
1152static inline void bs(struct vc_data *vc)
1153{
1154 if (vc->vc_x) {
1155 vc->vc_pos -= 2;
1156 vc->vc_x--;
1157 vc->vc_need_wrap = 0;
1158 notify_write(vc, '\b');
1159 }
1160}
1161
1162static inline void del(struct vc_data *vc)
1163{
1164 /* ignored */
1165}
1166
1167static void csi_J(struct vc_data *vc, int vpar)
1168{
1169 unsigned int count;
1170 unsigned short * start;
1171
1172 switch (vpar) {
1173 case 0: /* erase from cursor to end of display */
1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175 start = (unsigned short *)vc->vc_pos;
1176 break;
1177 case 1: /* erase from start to cursor */
1178 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1179 start = (unsigned short *)vc->vc_origin;
1180 break;
1181 case 3: /* erase scroll-back buffer (and whole display) */
1182 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1183 vc->vc_screenbuf_size);
1184 flush_scrollback(vc);
1185 set_origin(vc);
1186 if (con_is_visible(vc))
1187 update_screen(vc);
1188 /* fall through */
1189 case 2: /* erase whole display */
1190 count = vc->vc_cols * vc->vc_rows;
1191 start = (unsigned short *)vc->vc_origin;
1192 break;
1193 default:
1194 return;
1195 }
1196 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1197 if (con_should_update(vc))
1198 do_update_region(vc, (unsigned long) start, count);
1199 vc->vc_need_wrap = 0;
1200}
1201
1202static void csi_K(struct vc_data *vc, int vpar)
1203{
1204 unsigned int count;
1205 unsigned short * start;
1206
1207 switch (vpar) {
1208 case 0: /* erase from cursor to end of line */
1209 count = vc->vc_cols - vc->vc_x;
1210 start = (unsigned short *)vc->vc_pos;
1211 break;
1212 case 1: /* erase from start of line to cursor */
1213 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1214 count = vc->vc_x + 1;
1215 break;
1216 case 2: /* erase whole line */
1217 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1218 count = vc->vc_cols;
1219 break;
1220 default:
1221 return;
1222 }
1223 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1224 vc->vc_need_wrap = 0;
1225 if (con_should_update(vc))
1226 do_update_region(vc, (unsigned long) start, count);
1227}
1228
1229static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1230{ /* not vt100? */
1231 int count;
1232
1233 if (!vpar)
1234 vpar++;
1235 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1236
1237 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1238 if (con_should_update(vc))
1239 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1240 vc->vc_need_wrap = 0;
1241}
1242
1243static void default_attr(struct vc_data *vc)
1244{
1245 vc->vc_intensity = 1;
1246 vc->vc_italic = 0;
1247 vc->vc_underline = 0;
1248 vc->vc_reverse = 0;
1249 vc->vc_blink = 0;
1250 vc->vc_color = vc->vc_def_color;
1251}
1252
1253struct rgb { u8 r; u8 g; u8 b; };
1254
1255static void rgb_from_256(int i, struct rgb *c)
1256{
1257 if (i < 8) { /* Standard colours. */
1258 c->r = i&1 ? 0xaa : 0x00;
1259 c->g = i&2 ? 0xaa : 0x00;
1260 c->b = i&4 ? 0xaa : 0x00;
1261 } else if (i < 16) {
1262 c->r = i&1 ? 0xff : 0x55;
1263 c->g = i&2 ? 0xff : 0x55;
1264 c->b = i&4 ? 0xff : 0x55;
1265 } else if (i < 232) { /* 6x6x6 colour cube. */
1266 c->r = (i - 16) / 36 * 85 / 2;
1267 c->g = (i - 16) / 6 % 6 * 85 / 2;
1268 c->b = (i - 16) % 6 * 85 / 2;
1269 } else /* Grayscale ramp. */
1270 c->r = c->g = c->b = i * 10 - 2312;
1271}
1272
1273static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1274{
1275 u8 hue = 0, max = max3(c->r, c->g, c->b);
1276
1277 if (c->r > max / 2)
1278 hue |= 4;
1279 if (c->g > max / 2)
1280 hue |= 2;
1281 if (c->b > max / 2)
1282 hue |= 1;
1283
1284 if (hue == 7 && max <= 0x55) {
1285 hue = 0;
1286 vc->vc_intensity = 2;
1287 } else if (max > 0xaa)
1288 vc->vc_intensity = 2;
1289 else
1290 vc->vc_intensity = 1;
1291
1292 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1293}
1294
1295static void rgb_background(struct vc_data *vc, const struct rgb *c)
1296{
1297 /* For backgrounds, err on the dark side. */
1298 vc->vc_color = (vc->vc_color & 0x0f)
1299 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1300}
1301
1302/*
1303 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1304 * and thus need to be detected and ignored by hand. Strictly speaking, that
1305 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1306 * no one produces such codes and almost no one accepts them.
1307 *
1308 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1309 * supporting them.
1310 */
1311static int vc_t416_color(struct vc_data *vc, int i,
1312 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1313{
1314 struct rgb c;
1315
1316 i++;
1317 if (i > vc->vc_npar)
1318 return i;
1319
1320 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1321 /* 256 colours */
1322 i++;
1323 rgb_from_256(vc->vc_par[i], &c);
1324 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1325 /* 24 bit */
1326 c.r = vc->vc_par[i + 1];
1327 c.g = vc->vc_par[i + 2];
1328 c.b = vc->vc_par[i + 3];
1329 i += 3;
1330 } else
1331 return i;
1332
1333 set_color(vc, &c);
1334
1335 return i;
1336}
1337
1338/* console_lock is held */
1339static void csi_m(struct vc_data *vc)
1340{
1341 int i;
1342
1343 for (i = 0; i <= vc->vc_npar; i++)
1344 switch (vc->vc_par[i]) {
1345 case 0: /* all attributes off */
1346 default_attr(vc);
1347 break;
1348 case 1:
1349 vc->vc_intensity = 2;
1350 break;
1351 case 2:
1352 vc->vc_intensity = 0;
1353 break;
1354 case 3:
1355 vc->vc_italic = 1;
1356 break;
1357 case 21:
1358 /*
1359 * No console drivers support double underline, so
1360 * convert it to a single underline.
1361 */
1362 case 4:
1363 vc->vc_underline = 1;
1364 break;
1365 case 5:
1366 vc->vc_blink = 1;
1367 break;
1368 case 7:
1369 vc->vc_reverse = 1;
1370 break;
1371 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1372 * Select primary font, don't display control chars if
1373 * defined, don't set bit 8 on output.
1374 */
1375 vc->vc_translate = set_translate(vc->vc_charset == 0
1376 ? vc->vc_G0_charset
1377 : vc->vc_G1_charset, vc);
1378 vc->vc_disp_ctrl = 0;
1379 vc->vc_toggle_meta = 0;
1380 break;
1381 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1382 * Select first alternate font, lets chars < 32 be
1383 * displayed as ROM chars.
1384 */
1385 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1386 vc->vc_disp_ctrl = 1;
1387 vc->vc_toggle_meta = 0;
1388 break;
1389 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1390 * Select second alternate font, toggle high bit
1391 * before displaying as ROM char.
1392 */
1393 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1394 vc->vc_disp_ctrl = 1;
1395 vc->vc_toggle_meta = 1;
1396 break;
1397 case 22:
1398 vc->vc_intensity = 1;
1399 break;
1400 case 23:
1401 vc->vc_italic = 0;
1402 break;
1403 case 24:
1404 vc->vc_underline = 0;
1405 break;
1406 case 25:
1407 vc->vc_blink = 0;
1408 break;
1409 case 27:
1410 vc->vc_reverse = 0;
1411 break;
1412 case 38:
1413 i = vc_t416_color(vc, i, rgb_foreground);
1414 break;
1415 case 48:
1416 i = vc_t416_color(vc, i, rgb_background);
1417 break;
1418 case 39:
1419 vc->vc_color = (vc->vc_def_color & 0x0f) |
1420 (vc->vc_color & 0xf0);
1421 break;
1422 case 49:
1423 vc->vc_color = (vc->vc_def_color & 0xf0) |
1424 (vc->vc_color & 0x0f);
1425 break;
1426 default:
1427 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1428 if (vc->vc_par[i] < 100)
1429 vc->vc_intensity = 2;
1430 vc->vc_par[i] -= 60;
1431 }
1432 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1433 vc->vc_color = color_table[vc->vc_par[i] - 30]
1434 | (vc->vc_color & 0xf0);
1435 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1436 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1437 | (vc->vc_color & 0x0f);
1438 break;
1439 }
1440 update_attr(vc);
1441}
1442
1443static void respond_string(const char *p, struct tty_port *port)
1444{
1445 while (*p) {
1446 tty_insert_flip_char(port, *p, 0);
1447 p++;
1448 }
1449 tty_schedule_flip(port);
1450}
1451
1452static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1453{
1454 char buf[40];
1455
1456 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1457 respond_string(buf, tty->port);
1458}
1459
1460static inline void status_report(struct tty_struct *tty)
1461{
1462 respond_string("\033[0n", tty->port); /* Terminal ok */
1463}
1464
1465static inline void respond_ID(struct tty_struct *tty)
1466{
1467 respond_string(VT102ID, tty->port);
1468}
1469
1470void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1471{
1472 char buf[8];
1473
1474 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1475 (char)('!' + mry));
1476 respond_string(buf, tty->port);
1477}
1478
1479/* invoked via ioctl(TIOCLINUX) and through set_selection */
1480int mouse_reporting(void)
1481{
1482 return vc_cons[fg_console].d->vc_report_mouse;
1483}
1484
1485/* console_lock is held */
1486static void set_mode(struct vc_data *vc, int on_off)
1487{
1488 int i;
1489
1490 for (i = 0; i <= vc->vc_npar; i++)
1491 if (vc->vc_ques) {
1492 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1493 case 1: /* Cursor keys send ^[Ox/^[[x */
1494 if (on_off)
1495 set_kbd(vc, decckm);
1496 else
1497 clr_kbd(vc, decckm);
1498 break;
1499 case 3: /* 80/132 mode switch unimplemented */
1500#if 0
1501 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1502 /* this alone does not suffice; some user mode
1503 utility has to change the hardware regs */
1504#endif
1505 break;
1506 case 5: /* Inverted screen on/off */
1507 if (vc->vc_decscnm != on_off) {
1508 vc->vc_decscnm = on_off;
1509 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1510 update_attr(vc);
1511 }
1512 break;
1513 case 6: /* Origin relative/absolute */
1514 vc->vc_decom = on_off;
1515 gotoxay(vc, 0, 0);
1516 break;
1517 case 7: /* Autowrap on/off */
1518 vc->vc_decawm = on_off;
1519 break;
1520 case 8: /* Autorepeat on/off */
1521 if (on_off)
1522 set_kbd(vc, decarm);
1523 else
1524 clr_kbd(vc, decarm);
1525 break;
1526 case 9:
1527 vc->vc_report_mouse = on_off ? 1 : 0;
1528 break;
1529 case 25: /* Cursor on/off */
1530 vc->vc_deccm = on_off;
1531 break;
1532 case 1000:
1533 vc->vc_report_mouse = on_off ? 2 : 0;
1534 break;
1535 }
1536 } else {
1537 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1538 case 3: /* Monitor (display ctrls) */
1539 vc->vc_disp_ctrl = on_off;
1540 break;
1541 case 4: /* Insert Mode on/off */
1542 vc->vc_decim = on_off;
1543 break;
1544 case 20: /* Lf, Enter == CrLf/Lf */
1545 if (on_off)
1546 set_kbd(vc, lnm);
1547 else
1548 clr_kbd(vc, lnm);
1549 break;
1550 }
1551 }
1552}
1553
1554/* console_lock is held */
1555static void setterm_command(struct vc_data *vc)
1556{
1557 switch(vc->vc_par[0]) {
1558 case 1: /* set color for underline mode */
1559 if (vc->vc_can_do_color &&
1560 vc->vc_par[1] < 16) {
1561 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1562 if (vc->vc_underline)
1563 update_attr(vc);
1564 }
1565 break;
1566 case 2: /* set color for half intensity mode */
1567 if (vc->vc_can_do_color &&
1568 vc->vc_par[1] < 16) {
1569 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1570 if (vc->vc_intensity == 0)
1571 update_attr(vc);
1572 }
1573 break;
1574 case 8: /* store colors as defaults */
1575 vc->vc_def_color = vc->vc_attr;
1576 if (vc->vc_hi_font_mask == 0x100)
1577 vc->vc_def_color >>= 1;
1578 default_attr(vc);
1579 update_attr(vc);
1580 break;
1581 case 9: /* set blanking interval */
1582 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1583 poke_blanked_console();
1584 break;
1585 case 10: /* set bell frequency in Hz */
1586 if (vc->vc_npar >= 1)
1587 vc->vc_bell_pitch = vc->vc_par[1];
1588 else
1589 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1590 break;
1591 case 11: /* set bell duration in msec */
1592 if (vc->vc_npar >= 1)
1593 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1594 msecs_to_jiffies(vc->vc_par[1]) : 0;
1595 else
1596 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1597 break;
1598 case 12: /* bring specified console to the front */
1599 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1600 set_console(vc->vc_par[1] - 1);
1601 break;
1602 case 13: /* unblank the screen */
1603 poke_blanked_console();
1604 break;
1605 case 14: /* set vesa powerdown interval */
1606 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1607 break;
1608 case 15: /* activate the previous console */
1609 set_console(last_console);
1610 break;
1611 case 16: /* set cursor blink duration in msec */
1612 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1613 vc->vc_par[1] <= USHRT_MAX)
1614 vc->vc_cur_blink_ms = vc->vc_par[1];
1615 else
1616 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1617 break;
1618 }
1619}
1620
1621/* console_lock is held */
1622static void csi_at(struct vc_data *vc, unsigned int nr)
1623{
1624 if (nr > vc->vc_cols - vc->vc_x)
1625 nr = vc->vc_cols - vc->vc_x;
1626 else if (!nr)
1627 nr = 1;
1628 insert_char(vc, nr);
1629}
1630
1631/* console_lock is held */
1632static void csi_L(struct vc_data *vc, unsigned int nr)
1633{
1634 if (nr > vc->vc_rows - vc->vc_y)
1635 nr = vc->vc_rows - vc->vc_y;
1636 else if (!nr)
1637 nr = 1;
1638 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1639 vc->vc_need_wrap = 0;
1640}
1641
1642/* console_lock is held */
1643static void csi_P(struct vc_data *vc, unsigned int nr)
1644{
1645 if (nr > vc->vc_cols - vc->vc_x)
1646 nr = vc->vc_cols - vc->vc_x;
1647 else if (!nr)
1648 nr = 1;
1649 delete_char(vc, nr);
1650}
1651
1652/* console_lock is held */
1653static void csi_M(struct vc_data *vc, unsigned int nr)
1654{
1655 if (nr > vc->vc_rows - vc->vc_y)
1656 nr = vc->vc_rows - vc->vc_y;
1657 else if (!nr)
1658 nr=1;
1659 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1660 vc->vc_need_wrap = 0;
1661}
1662
1663/* console_lock is held (except via vc_init->reset_terminal */
1664static void save_cur(struct vc_data *vc)
1665{
1666 vc->vc_saved_x = vc->vc_x;
1667 vc->vc_saved_y = vc->vc_y;
1668 vc->vc_s_intensity = vc->vc_intensity;
1669 vc->vc_s_italic = vc->vc_italic;
1670 vc->vc_s_underline = vc->vc_underline;
1671 vc->vc_s_blink = vc->vc_blink;
1672 vc->vc_s_reverse = vc->vc_reverse;
1673 vc->vc_s_charset = vc->vc_charset;
1674 vc->vc_s_color = vc->vc_color;
1675 vc->vc_saved_G0 = vc->vc_G0_charset;
1676 vc->vc_saved_G1 = vc->vc_G1_charset;
1677}
1678
1679/* console_lock is held */
1680static void restore_cur(struct vc_data *vc)
1681{
1682 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1683 vc->vc_intensity = vc->vc_s_intensity;
1684 vc->vc_italic = vc->vc_s_italic;
1685 vc->vc_underline = vc->vc_s_underline;
1686 vc->vc_blink = vc->vc_s_blink;
1687 vc->vc_reverse = vc->vc_s_reverse;
1688 vc->vc_charset = vc->vc_s_charset;
1689 vc->vc_color = vc->vc_s_color;
1690 vc->vc_G0_charset = vc->vc_saved_G0;
1691 vc->vc_G1_charset = vc->vc_saved_G1;
1692 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1693 update_attr(vc);
1694 vc->vc_need_wrap = 0;
1695}
1696
1697enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1698 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1699 ESpalette, ESosc };
1700
1701/* console_lock is held (except via vc_init()) */
1702static void reset_terminal(struct vc_data *vc, int do_clear)
1703{
1704 vc->vc_top = 0;
1705 vc->vc_bottom = vc->vc_rows;
1706 vc->vc_state = ESnormal;
1707 vc->vc_ques = 0;
1708 vc->vc_translate = set_translate(LAT1_MAP, vc);
1709 vc->vc_G0_charset = LAT1_MAP;
1710 vc->vc_G1_charset = GRAF_MAP;
1711 vc->vc_charset = 0;
1712 vc->vc_need_wrap = 0;
1713 vc->vc_report_mouse = 0;
1714 vc->vc_utf = default_utf8;
1715 vc->vc_utf_count = 0;
1716
1717 vc->vc_disp_ctrl = 0;
1718 vc->vc_toggle_meta = 0;
1719
1720 vc->vc_decscnm = 0;
1721 vc->vc_decom = 0;
1722 vc->vc_decawm = 1;
1723 vc->vc_deccm = global_cursor_default;
1724 vc->vc_decim = 0;
1725
1726 vt_reset_keyboard(vc->vc_num);
1727
1728 vc->vc_cursor_type = cur_default;
1729 vc->vc_complement_mask = vc->vc_s_complement_mask;
1730
1731 default_attr(vc);
1732 update_attr(vc);
1733
1734 vc->vc_tab_stop[0] =
1735 vc->vc_tab_stop[1] =
1736 vc->vc_tab_stop[2] =
1737 vc->vc_tab_stop[3] =
1738 vc->vc_tab_stop[4] =
1739 vc->vc_tab_stop[5] =
1740 vc->vc_tab_stop[6] =
1741 vc->vc_tab_stop[7] = 0x01010101;
1742
1743 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1744 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1745 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1746
1747 gotoxy(vc, 0, 0);
1748 save_cur(vc);
1749 if (do_clear)
1750 csi_J(vc, 2);
1751}
1752
1753/* console_lock is held */
1754static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1755{
1756 /*
1757 * Control characters can be used in the _middle_
1758 * of an escape sequence.
1759 */
1760 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1761 return;
1762 switch (c) {
1763 case 0:
1764 return;
1765 case 7:
1766 if (vc->vc_state == ESosc)
1767 vc->vc_state = ESnormal;
1768 else if (vc->vc_bell_duration)
1769 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1770 return;
1771 case 8:
1772 bs(vc);
1773 return;
1774 case 9:
1775 vc->vc_pos -= (vc->vc_x << 1);
1776 while (vc->vc_x < vc->vc_cols - 1) {
1777 vc->vc_x++;
1778 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1779 break;
1780 }
1781 vc->vc_pos += (vc->vc_x << 1);
1782 notify_write(vc, '\t');
1783 return;
1784 case 10: case 11: case 12:
1785 lf(vc);
1786 if (!is_kbd(vc, lnm))
1787 return;
1788 case 13:
1789 cr(vc);
1790 return;
1791 case 14:
1792 vc->vc_charset = 1;
1793 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1794 vc->vc_disp_ctrl = 1;
1795 return;
1796 case 15:
1797 vc->vc_charset = 0;
1798 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1799 vc->vc_disp_ctrl = 0;
1800 return;
1801 case 24: case 26:
1802 vc->vc_state = ESnormal;
1803 return;
1804 case 27:
1805 vc->vc_state = ESesc;
1806 return;
1807 case 127:
1808 del(vc);
1809 return;
1810 case 128+27:
1811 vc->vc_state = ESsquare;
1812 return;
1813 }
1814 switch(vc->vc_state) {
1815 case ESesc:
1816 vc->vc_state = ESnormal;
1817 switch (c) {
1818 case '[':
1819 vc->vc_state = ESsquare;
1820 return;
1821 case ']':
1822 vc->vc_state = ESnonstd;
1823 return;
1824 case '%':
1825 vc->vc_state = ESpercent;
1826 return;
1827 case 'E':
1828 cr(vc);
1829 lf(vc);
1830 return;
1831 case 'M':
1832 ri(vc);
1833 return;
1834 case 'D':
1835 lf(vc);
1836 return;
1837 case 'H':
1838 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1839 return;
1840 case 'Z':
1841 respond_ID(tty);
1842 return;
1843 case '7':
1844 save_cur(vc);
1845 return;
1846 case '8':
1847 restore_cur(vc);
1848 return;
1849 case '(':
1850 vc->vc_state = ESsetG0;
1851 return;
1852 case ')':
1853 vc->vc_state = ESsetG1;
1854 return;
1855 case '#':
1856 vc->vc_state = EShash;
1857 return;
1858 case 'c':
1859 reset_terminal(vc, 1);
1860 return;
1861 case '>': /* Numeric keypad */
1862 clr_kbd(vc, kbdapplic);
1863 return;
1864 case '=': /* Appl. keypad */
1865 set_kbd(vc, kbdapplic);
1866 return;
1867 }
1868 return;
1869 case ESnonstd:
1870 if (c=='P') { /* palette escape sequence */
1871 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1872 vc->vc_par[vc->vc_npar] = 0;
1873 vc->vc_npar = 0;
1874 vc->vc_state = ESpalette;
1875 return;
1876 } else if (c=='R') { /* reset palette */
1877 reset_palette(vc);
1878 vc->vc_state = ESnormal;
1879 } else if (c>='0' && c<='9')
1880 vc->vc_state = ESosc;
1881 else
1882 vc->vc_state = ESnormal;
1883 return;
1884 case ESpalette:
1885 if (isxdigit(c)) {
1886 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1887 if (vc->vc_npar == 7) {
1888 int i = vc->vc_par[0] * 3, j = 1;
1889 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1890 vc->vc_palette[i++] += vc->vc_par[j++];
1891 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1892 vc->vc_palette[i++] += vc->vc_par[j++];
1893 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1894 vc->vc_palette[i] += vc->vc_par[j];
1895 set_palette(vc);
1896 vc->vc_state = ESnormal;
1897 }
1898 } else
1899 vc->vc_state = ESnormal;
1900 return;
1901 case ESsquare:
1902 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1903 vc->vc_par[vc->vc_npar] = 0;
1904 vc->vc_npar = 0;
1905 vc->vc_state = ESgetpars;
1906 if (c == '[') { /* Function key */
1907 vc->vc_state=ESfunckey;
1908 return;
1909 }
1910 vc->vc_ques = (c == '?');
1911 if (vc->vc_ques)
1912 return;
1913 case ESgetpars:
1914 if (c == ';' && vc->vc_npar < NPAR - 1) {
1915 vc->vc_npar++;
1916 return;
1917 } else if (c>='0' && c<='9') {
1918 vc->vc_par[vc->vc_npar] *= 10;
1919 vc->vc_par[vc->vc_npar] += c - '0';
1920 return;
1921 }
1922 vc->vc_state = ESnormal;
1923 switch(c) {
1924 case 'h':
1925 set_mode(vc, 1);
1926 return;
1927 case 'l':
1928 set_mode(vc, 0);
1929 return;
1930 case 'c':
1931 if (vc->vc_ques) {
1932 if (vc->vc_par[0])
1933 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1934 else
1935 vc->vc_cursor_type = cur_default;
1936 return;
1937 }
1938 break;
1939 case 'm':
1940 if (vc->vc_ques) {
1941 clear_selection();
1942 if (vc->vc_par[0])
1943 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1944 else
1945 vc->vc_complement_mask = vc->vc_s_complement_mask;
1946 return;
1947 }
1948 break;
1949 case 'n':
1950 if (!vc->vc_ques) {
1951 if (vc->vc_par[0] == 5)
1952 status_report(tty);
1953 else if (vc->vc_par[0] == 6)
1954 cursor_report(vc, tty);
1955 }
1956 return;
1957 }
1958 if (vc->vc_ques) {
1959 vc->vc_ques = 0;
1960 return;
1961 }
1962 switch(c) {
1963 case 'G': case '`':
1964 if (vc->vc_par[0])
1965 vc->vc_par[0]--;
1966 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1967 return;
1968 case 'A':
1969 if (!vc->vc_par[0])
1970 vc->vc_par[0]++;
1971 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1972 return;
1973 case 'B': case 'e':
1974 if (!vc->vc_par[0])
1975 vc->vc_par[0]++;
1976 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1977 return;
1978 case 'C': case 'a':
1979 if (!vc->vc_par[0])
1980 vc->vc_par[0]++;
1981 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1982 return;
1983 case 'D':
1984 if (!vc->vc_par[0])
1985 vc->vc_par[0]++;
1986 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1987 return;
1988 case 'E':
1989 if (!vc->vc_par[0])
1990 vc->vc_par[0]++;
1991 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1992 return;
1993 case 'F':
1994 if (!vc->vc_par[0])
1995 vc->vc_par[0]++;
1996 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1997 return;
1998 case 'd':
1999 if (vc->vc_par[0])
2000 vc->vc_par[0]--;
2001 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2002 return;
2003 case 'H': case 'f':
2004 if (vc->vc_par[0])
2005 vc->vc_par[0]--;
2006 if (vc->vc_par[1])
2007 vc->vc_par[1]--;
2008 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2009 return;
2010 case 'J':
2011 csi_J(vc, vc->vc_par[0]);
2012 return;
2013 case 'K':
2014 csi_K(vc, vc->vc_par[0]);
2015 return;
2016 case 'L':
2017 csi_L(vc, vc->vc_par[0]);
2018 return;
2019 case 'M':
2020 csi_M(vc, vc->vc_par[0]);
2021 return;
2022 case 'P':
2023 csi_P(vc, vc->vc_par[0]);
2024 return;
2025 case 'c':
2026 if (!vc->vc_par[0])
2027 respond_ID(tty);
2028 return;
2029 case 'g':
2030 if (!vc->vc_par[0])
2031 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2032 else if (vc->vc_par[0] == 3) {
2033 vc->vc_tab_stop[0] =
2034 vc->vc_tab_stop[1] =
2035 vc->vc_tab_stop[2] =
2036 vc->vc_tab_stop[3] =
2037 vc->vc_tab_stop[4] =
2038 vc->vc_tab_stop[5] =
2039 vc->vc_tab_stop[6] =
2040 vc->vc_tab_stop[7] = 0;
2041 }
2042 return;
2043 case 'm':
2044 csi_m(vc);
2045 return;
2046 case 'q': /* DECLL - but only 3 leds */
2047 /* map 0,1,2,3 to 0,1,2,4 */
2048 if (vc->vc_par[0] < 4)
2049 vt_set_led_state(vc->vc_num,
2050 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2051 return;
2052 case 'r':
2053 if (!vc->vc_par[0])
2054 vc->vc_par[0]++;
2055 if (!vc->vc_par[1])
2056 vc->vc_par[1] = vc->vc_rows;
2057 /* Minimum allowed region is 2 lines */
2058 if (vc->vc_par[0] < vc->vc_par[1] &&
2059 vc->vc_par[1] <= vc->vc_rows) {
2060 vc->vc_top = vc->vc_par[0] - 1;
2061 vc->vc_bottom = vc->vc_par[1];
2062 gotoxay(vc, 0, 0);
2063 }
2064 return;
2065 case 's':
2066 save_cur(vc);
2067 return;
2068 case 'u':
2069 restore_cur(vc);
2070 return;
2071 case 'X':
2072 csi_X(vc, vc->vc_par[0]);
2073 return;
2074 case '@':
2075 csi_at(vc, vc->vc_par[0]);
2076 return;
2077 case ']': /* setterm functions */
2078 setterm_command(vc);
2079 return;
2080 }
2081 return;
2082 case ESpercent:
2083 vc->vc_state = ESnormal;
2084 switch (c) {
2085 case '@': /* defined in ISO 2022 */
2086 vc->vc_utf = 0;
2087 return;
2088 case 'G': /* prelim official escape code */
2089 case '8': /* retained for compatibility */
2090 vc->vc_utf = 1;
2091 return;
2092 }
2093 return;
2094 case ESfunckey:
2095 vc->vc_state = ESnormal;
2096 return;
2097 case EShash:
2098 vc->vc_state = ESnormal;
2099 if (c == '8') {
2100 /* DEC screen alignment test. kludge :-) */
2101 vc->vc_video_erase_char =
2102 (vc->vc_video_erase_char & 0xff00) | 'E';
2103 csi_J(vc, 2);
2104 vc->vc_video_erase_char =
2105 (vc->vc_video_erase_char & 0xff00) | ' ';
2106 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2107 }
2108 return;
2109 case ESsetG0:
2110 if (c == '0')
2111 vc->vc_G0_charset = GRAF_MAP;
2112 else if (c == 'B')
2113 vc->vc_G0_charset = LAT1_MAP;
2114 else if (c == 'U')
2115 vc->vc_G0_charset = IBMPC_MAP;
2116 else if (c == 'K')
2117 vc->vc_G0_charset = USER_MAP;
2118 if (vc->vc_charset == 0)
2119 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2120 vc->vc_state = ESnormal;
2121 return;
2122 case ESsetG1:
2123 if (c == '0')
2124 vc->vc_G1_charset = GRAF_MAP;
2125 else if (c == 'B')
2126 vc->vc_G1_charset = LAT1_MAP;
2127 else if (c == 'U')
2128 vc->vc_G1_charset = IBMPC_MAP;
2129 else if (c == 'K')
2130 vc->vc_G1_charset = USER_MAP;
2131 if (vc->vc_charset == 1)
2132 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2133 vc->vc_state = ESnormal;
2134 return;
2135 case ESosc:
2136 return;
2137 default:
2138 vc->vc_state = ESnormal;
2139 }
2140}
2141
2142/* is_double_width() is based on the wcwidth() implementation by
2143 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2144 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2145 */
2146struct interval {
2147 uint32_t first;
2148 uint32_t last;
2149};
2150
2151static int ucs_cmp(const void *key, const void *elt)
2152{
2153 uint32_t ucs = *(uint32_t *)key;
2154 struct interval e = *(struct interval *) elt;
2155
2156 if (ucs > e.last)
2157 return 1;
2158 else if (ucs < e.first)
2159 return -1;
2160 return 0;
2161}
2162
2163static int is_double_width(uint32_t ucs)
2164{
2165 static const struct interval double_width[] = {
2166 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2167 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2168 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2169 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2170 };
2171 if (ucs < double_width[0].first ||
2172 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2173 return 0;
2174
2175 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2176 sizeof(struct interval), ucs_cmp) != NULL;
2177}
2178
2179static void con_flush(struct vc_data *vc, unsigned long draw_from,
2180 unsigned long draw_to, int *draw_x)
2181{
2182 if (*draw_x < 0)
2183 return;
2184
2185 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2186 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2187 *draw_x = -1;
2188}
2189
2190/* acquires console_lock */
2191static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2192{
2193 int c, tc, ok, n = 0, draw_x = -1;
2194 unsigned int currcons;
2195 unsigned long draw_from = 0, draw_to = 0;
2196 struct vc_data *vc;
2197 unsigned char vc_attr;
2198 struct vt_notifier_param param;
2199 uint8_t rescan;
2200 uint8_t inverse;
2201 uint8_t width;
2202 u16 himask, charmask;
2203
2204 if (in_interrupt())
2205 return count;
2206
2207 might_sleep();
2208
2209 console_lock();
2210 vc = tty->driver_data;
2211 if (vc == NULL) {
2212 pr_err("vt: argh, driver_data is NULL !\n");
2213 console_unlock();
2214 return 0;
2215 }
2216
2217 currcons = vc->vc_num;
2218 if (!vc_cons_allocated(currcons)) {
2219 /* could this happen? */
2220 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2221 console_unlock();
2222 return 0;
2223 }
2224
2225 himask = vc->vc_hi_font_mask;
2226 charmask = himask ? 0x1ff : 0xff;
2227
2228 /* undraw cursor first */
2229 if (con_is_fg(vc))
2230 hide_cursor(vc);
2231
2232 param.vc = vc;
2233
2234 while (!tty->stopped && count) {
2235 int orig = *buf;
2236 c = orig;
2237 buf++;
2238 n++;
2239 count--;
2240 rescan = 0;
2241 inverse = 0;
2242 width = 1;
2243
2244 /* Do no translation at all in control states */
2245 if (vc->vc_state != ESnormal) {
2246 tc = c;
2247 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2248 /* Combine UTF-8 into Unicode in vc_utf_char.
2249 * vc_utf_count is the number of continuation bytes still
2250 * expected to arrive.
2251 * vc_npar is the number of continuation bytes arrived so
2252 * far
2253 */
2254rescan_last_byte:
2255 if ((c & 0xc0) == 0x80) {
2256 /* Continuation byte received */
2257 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2258 if (vc->vc_utf_count) {
2259 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2260 vc->vc_npar++;
2261 if (--vc->vc_utf_count) {
2262 /* Still need some bytes */
2263 continue;
2264 }
2265 /* Got a whole character */
2266 c = vc->vc_utf_char;
2267 /* Reject overlong sequences */
2268 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2269 c > utf8_length_changes[vc->vc_npar])
2270 c = 0xfffd;
2271 } else {
2272 /* Unexpected continuation byte */
2273 vc->vc_utf_count = 0;
2274 c = 0xfffd;
2275 }
2276 } else {
2277 /* Single ASCII byte or first byte of a sequence received */
2278 if (vc->vc_utf_count) {
2279 /* Continuation byte expected */
2280 rescan = 1;
2281 vc->vc_utf_count = 0;
2282 c = 0xfffd;
2283 } else if (c > 0x7f) {
2284 /* First byte of a multibyte sequence received */
2285 vc->vc_npar = 0;
2286 if ((c & 0xe0) == 0xc0) {
2287 vc->vc_utf_count = 1;
2288 vc->vc_utf_char = (c & 0x1f);
2289 } else if ((c & 0xf0) == 0xe0) {
2290 vc->vc_utf_count = 2;
2291 vc->vc_utf_char = (c & 0x0f);
2292 } else if ((c & 0xf8) == 0xf0) {
2293 vc->vc_utf_count = 3;
2294 vc->vc_utf_char = (c & 0x07);
2295 } else if ((c & 0xfc) == 0xf8) {
2296 vc->vc_utf_count = 4;
2297 vc->vc_utf_char = (c & 0x03);
2298 } else if ((c & 0xfe) == 0xfc) {
2299 vc->vc_utf_count = 5;
2300 vc->vc_utf_char = (c & 0x01);
2301 } else {
2302 /* 254 and 255 are invalid */
2303 c = 0xfffd;
2304 }
2305 if (vc->vc_utf_count) {
2306 /* Still need some bytes */
2307 continue;
2308 }
2309 }
2310 /* Nothing to do if an ASCII byte was received */
2311 }
2312 /* End of UTF-8 decoding. */
2313 /* c is the received character, or U+FFFD for invalid sequences. */
2314 /* Replace invalid Unicode code points with U+FFFD too */
2315 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2316 c = 0xfffd;
2317 tc = c;
2318 } else { /* no utf or alternate charset mode */
2319 tc = vc_translate(vc, c);
2320 }
2321
2322 param.c = tc;
2323 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2324 ¶m) == NOTIFY_STOP)
2325 continue;
2326
2327 /* If the original code was a control character we
2328 * only allow a glyph to be displayed if the code is
2329 * not normally used (such as for cursor movement) or
2330 * if the disp_ctrl mode has been explicitly enabled.
2331 * Certain characters (as given by the CTRL_ALWAYS
2332 * bitmap) are always displayed as control characters,
2333 * as the console would be pretty useless without
2334 * them; to display an arbitrary font position use the
2335 * direct-to-font zone in UTF-8 mode.
2336 */
2337 ok = tc && (c >= 32 ||
2338 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2339 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2340 && (c != 127 || vc->vc_disp_ctrl)
2341 && (c != 128+27);
2342
2343 if (vc->vc_state == ESnormal && ok) {
2344 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2345 if (is_double_width(c))
2346 width = 2;
2347 }
2348 /* Now try to find out how to display it */
2349 tc = conv_uni_to_pc(vc, tc);
2350 if (tc & ~charmask) {
2351 if (tc == -1 || tc == -2) {
2352 continue; /* nothing to display */
2353 }
2354 /* Glyph not found */
2355 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2356 /* In legacy mode use the glyph we get by a 1:1 mapping.
2357 This would make absolutely no sense with Unicode in mind,
2358 but do this for ASCII characters since a font may lack
2359 Unicode mapping info and we don't want to end up with
2360 having question marks only. */
2361 tc = c;
2362 } else {
2363 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2364 tc = conv_uni_to_pc(vc, 0xfffd);
2365 if (tc < 0) {
2366 inverse = 1;
2367 tc = conv_uni_to_pc(vc, '?');
2368 if (tc < 0) tc = '?';
2369 }
2370 }
2371 }
2372
2373 if (!inverse) {
2374 vc_attr = vc->vc_attr;
2375 } else {
2376 /* invert vc_attr */
2377 if (!vc->vc_can_do_color) {
2378 vc_attr = (vc->vc_attr) ^ 0x08;
2379 } else if (vc->vc_hi_font_mask == 0x100) {
2380 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2381 } else {
2382 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2383 }
2384 con_flush(vc, draw_from, draw_to, &draw_x);
2385 }
2386
2387 while (1) {
2388 if (vc->vc_need_wrap || vc->vc_decim)
2389 con_flush(vc, draw_from, draw_to,
2390 &draw_x);
2391 if (vc->vc_need_wrap) {
2392 cr(vc);
2393 lf(vc);
2394 }
2395 if (vc->vc_decim)
2396 insert_char(vc, 1);
2397 scr_writew(himask ?
2398 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2399 (vc_attr << 8) + tc,
2400 (u16 *) vc->vc_pos);
2401 if (con_should_update(vc) && draw_x < 0) {
2402 draw_x = vc->vc_x;
2403 draw_from = vc->vc_pos;
2404 }
2405 if (vc->vc_x == vc->vc_cols - 1) {
2406 vc->vc_need_wrap = vc->vc_decawm;
2407 draw_to = vc->vc_pos + 2;
2408 } else {
2409 vc->vc_x++;
2410 draw_to = (vc->vc_pos += 2);
2411 }
2412
2413 if (!--width) break;
2414
2415 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2416 if (tc < 0) tc = ' ';
2417 }
2418 notify_write(vc, c);
2419
2420 if (inverse)
2421 con_flush(vc, draw_from, draw_to, &draw_x);
2422
2423 if (rescan) {
2424 rescan = 0;
2425 inverse = 0;
2426 width = 1;
2427 c = orig;
2428 goto rescan_last_byte;
2429 }
2430 continue;
2431 }
2432 con_flush(vc, draw_from, draw_to, &draw_x);
2433 do_con_trol(tty, vc, orig);
2434 }
2435 con_flush(vc, draw_from, draw_to, &draw_x);
2436 console_conditional_schedule();
2437 console_unlock();
2438 notify_update(vc);
2439 return n;
2440}
2441
2442/*
2443 * This is the console switching callback.
2444 *
2445 * Doing console switching in a process context allows
2446 * us to do the switches asynchronously (needed when we want
2447 * to switch due to a keyboard interrupt). Synchronization
2448 * with other console code and prevention of re-entrancy is
2449 * ensured with console_lock.
2450 */
2451static void console_callback(struct work_struct *ignored)
2452{
2453 console_lock();
2454
2455 if (want_console >= 0) {
2456 if (want_console != fg_console &&
2457 vc_cons_allocated(want_console)) {
2458 hide_cursor(vc_cons[fg_console].d);
2459 change_console(vc_cons[want_console].d);
2460 /* we only changed when the console had already
2461 been allocated - a new console is not created
2462 in an interrupt routine */
2463 }
2464 want_console = -1;
2465 }
2466 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2467 do_poke_blanked_console = 0;
2468 poke_blanked_console();
2469 }
2470 if (scrollback_delta) {
2471 struct vc_data *vc = vc_cons[fg_console].d;
2472 clear_selection();
2473 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2474 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2475 scrollback_delta = 0;
2476 }
2477 if (blank_timer_expired) {
2478 do_blank_screen(0);
2479 blank_timer_expired = 0;
2480 }
2481 notify_update(vc_cons[fg_console].d);
2482
2483 console_unlock();
2484}
2485
2486int set_console(int nr)
2487{
2488 struct vc_data *vc = vc_cons[fg_console].d;
2489
2490 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2491 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2492
2493 /*
2494 * Console switch will fail in console_callback() or
2495 * change_console() so there is no point scheduling
2496 * the callback
2497 *
2498 * Existing set_console() users don't check the return
2499 * value so this shouldn't break anything
2500 */
2501 return -EINVAL;
2502 }
2503
2504 want_console = nr;
2505 schedule_console_callback();
2506
2507 return 0;
2508}
2509
2510struct tty_driver *console_driver;
2511
2512#ifdef CONFIG_VT_CONSOLE
2513
2514/**
2515 * vt_kmsg_redirect() - Sets/gets the kernel message console
2516 * @new: The new virtual terminal number or -1 if the console should stay
2517 * unchanged
2518 *
2519 * By default, the kernel messages are always printed on the current virtual
2520 * console. However, the user may modify that default with the
2521 * TIOCL_SETKMSGREDIRECT ioctl call.
2522 *
2523 * This function sets the kernel message console to be @new. It returns the old
2524 * virtual console number. The virtual terminal number 0 (both as parameter and
2525 * return value) means no redirection (i.e. always printed on the currently
2526 * active console).
2527 *
2528 * The parameter -1 means that only the current console is returned, but the
2529 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2530 * case to make the code more understandable.
2531 *
2532 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2533 * the parameter and always returns 0.
2534 */
2535int vt_kmsg_redirect(int new)
2536{
2537 static int kmsg_con;
2538
2539 if (new != -1)
2540 return xchg(&kmsg_con, new);
2541 else
2542 return kmsg_con;
2543}
2544
2545/*
2546 * Console on virtual terminal
2547 *
2548 * The console must be locked when we get here.
2549 */
2550
2551static void vt_console_print(struct console *co, const char *b, unsigned count)
2552{
2553 struct vc_data *vc = vc_cons[fg_console].d;
2554 unsigned char c;
2555 static DEFINE_SPINLOCK(printing_lock);
2556 const ushort *start;
2557 ushort cnt = 0;
2558 ushort myx;
2559 int kmsg_console;
2560
2561 /* console busy or not yet initialized */
2562 if (!printable)
2563 return;
2564 if (!spin_trylock(&printing_lock))
2565 return;
2566
2567 kmsg_console = vt_get_kmsg_redirect();
2568 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2569 vc = vc_cons[kmsg_console - 1].d;
2570
2571 /* read `x' only after setting currcons properly (otherwise
2572 the `x' macro will read the x of the foreground console). */
2573 myx = vc->vc_x;
2574
2575 if (!vc_cons_allocated(fg_console)) {
2576 /* impossible */
2577 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2578 goto quit;
2579 }
2580
2581 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2582 goto quit;
2583
2584 /* undraw cursor first */
2585 if (con_is_fg(vc))
2586 hide_cursor(vc);
2587
2588 start = (ushort *)vc->vc_pos;
2589
2590 /* Contrived structure to try to emulate original need_wrap behaviour
2591 * Problems caused when we have need_wrap set on '\n' character */
2592 while (count--) {
2593 c = *b++;
2594 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2595 if (cnt > 0) {
2596 if (con_is_visible(vc))
2597 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2598 vc->vc_x += cnt;
2599 if (vc->vc_need_wrap)
2600 vc->vc_x--;
2601 cnt = 0;
2602 }
2603 if (c == 8) { /* backspace */
2604 bs(vc);
2605 start = (ushort *)vc->vc_pos;
2606 myx = vc->vc_x;
2607 continue;
2608 }
2609 if (c != 13)
2610 lf(vc);
2611 cr(vc);
2612 start = (ushort *)vc->vc_pos;
2613 myx = vc->vc_x;
2614 if (c == 10 || c == 13)
2615 continue;
2616 }
2617 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2618 notify_write(vc, c);
2619 cnt++;
2620 if (myx == vc->vc_cols - 1) {
2621 vc->vc_need_wrap = 1;
2622 continue;
2623 }
2624 vc->vc_pos += 2;
2625 myx++;
2626 }
2627 if (cnt > 0) {
2628 if (con_is_visible(vc))
2629 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2630 vc->vc_x += cnt;
2631 if (vc->vc_x == vc->vc_cols) {
2632 vc->vc_x--;
2633 vc->vc_need_wrap = 1;
2634 }
2635 }
2636 set_cursor(vc);
2637 notify_update(vc);
2638
2639quit:
2640 spin_unlock(&printing_lock);
2641}
2642
2643static struct tty_driver *vt_console_device(struct console *c, int *index)
2644{
2645 *index = c->index ? c->index-1 : fg_console;
2646 return console_driver;
2647}
2648
2649static struct console vt_console_driver = {
2650 .name = "tty",
2651 .write = vt_console_print,
2652 .device = vt_console_device,
2653 .unblank = unblank_screen,
2654 .flags = CON_PRINTBUFFER,
2655 .index = -1,
2656};
2657#endif
2658
2659/*
2660 * Handling of Linux-specific VC ioctls
2661 */
2662
2663/*
2664 * Generally a bit racy with respect to console_lock();.
2665 *
2666 * There are some functions which don't need it.
2667 *
2668 * There are some functions which can sleep for arbitrary periods
2669 * (paste_selection) but we don't need the lock there anyway.
2670 *
2671 * set_selection has locking, and definitely needs it
2672 */
2673
2674int tioclinux(struct tty_struct *tty, unsigned long arg)
2675{
2676 char type, data;
2677 char __user *p = (char __user *)arg;
2678 int lines;
2679 int ret;
2680
2681 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2682 return -EPERM;
2683 if (get_user(type, p))
2684 return -EFAULT;
2685 ret = 0;
2686
2687 switch (type)
2688 {
2689 case TIOCL_SETSEL:
2690 console_lock();
2691 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2692 console_unlock();
2693 break;
2694 case TIOCL_PASTESEL:
2695 ret = paste_selection(tty);
2696 break;
2697 case TIOCL_UNBLANKSCREEN:
2698 console_lock();
2699 unblank_screen();
2700 console_unlock();
2701 break;
2702 case TIOCL_SELLOADLUT:
2703 console_lock();
2704 ret = sel_loadlut(p);
2705 console_unlock();
2706 break;
2707 case TIOCL_GETSHIFTSTATE:
2708
2709 /*
2710 * Make it possible to react to Shift+Mousebutton.
2711 * Note that 'shift_state' is an undocumented
2712 * kernel-internal variable; programs not closely
2713 * related to the kernel should not use this.
2714 */
2715 data = vt_get_shift_state();
2716 ret = put_user(data, p);
2717 break;
2718 case TIOCL_GETMOUSEREPORTING:
2719 console_lock(); /* May be overkill */
2720 data = mouse_reporting();
2721 console_unlock();
2722 ret = put_user(data, p);
2723 break;
2724 case TIOCL_SETVESABLANK:
2725 console_lock();
2726 ret = set_vesa_blanking(p);
2727 console_unlock();
2728 break;
2729 case TIOCL_GETKMSGREDIRECT:
2730 data = vt_get_kmsg_redirect();
2731 ret = put_user(data, p);
2732 break;
2733 case TIOCL_SETKMSGREDIRECT:
2734 if (!capable(CAP_SYS_ADMIN)) {
2735 ret = -EPERM;
2736 } else {
2737 if (get_user(data, p+1))
2738 ret = -EFAULT;
2739 else
2740 vt_kmsg_redirect(data);
2741 }
2742 break;
2743 case TIOCL_GETFGCONSOLE:
2744 /* No locking needed as this is a transiently
2745 correct return anyway if the caller hasn't
2746 disabled switching */
2747 ret = fg_console;
2748 break;
2749 case TIOCL_SCROLLCONSOLE:
2750 if (get_user(lines, (s32 __user *)(p+4))) {
2751 ret = -EFAULT;
2752 } else {
2753 /* Need the console lock here. Note that lots
2754 of other calls need fixing before the lock
2755 is actually useful ! */
2756 console_lock();
2757 scrollfront(vc_cons[fg_console].d, lines);
2758 console_unlock();
2759 ret = 0;
2760 }
2761 break;
2762 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2763 console_lock();
2764 ignore_poke = 1;
2765 do_blank_screen(0);
2766 console_unlock();
2767 break;
2768 case TIOCL_BLANKEDSCREEN:
2769 ret = console_blanked;
2770 break;
2771 default:
2772 ret = -EINVAL;
2773 break;
2774 }
2775 return ret;
2776}
2777
2778/*
2779 * /dev/ttyN handling
2780 */
2781
2782static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2783{
2784 int retval;
2785
2786 retval = do_con_write(tty, buf, count);
2787 con_flush_chars(tty);
2788
2789 return retval;
2790}
2791
2792static int con_put_char(struct tty_struct *tty, unsigned char ch)
2793{
2794 if (in_interrupt())
2795 return 0; /* n_r3964 calls put_char() from interrupt context */
2796 return do_con_write(tty, &ch, 1);
2797}
2798
2799static int con_write_room(struct tty_struct *tty)
2800{
2801 if (tty->stopped)
2802 return 0;
2803 return 32768; /* No limit, really; we're not buffering */
2804}
2805
2806static int con_chars_in_buffer(struct tty_struct *tty)
2807{
2808 return 0; /* we're not buffering */
2809}
2810
2811/*
2812 * con_throttle and con_unthrottle are only used for
2813 * paste_selection(), which has to stuff in a large number of
2814 * characters...
2815 */
2816static void con_throttle(struct tty_struct *tty)
2817{
2818}
2819
2820static void con_unthrottle(struct tty_struct *tty)
2821{
2822 struct vc_data *vc = tty->driver_data;
2823
2824 wake_up_interruptible(&vc->paste_wait);
2825}
2826
2827/*
2828 * Turn the Scroll-Lock LED on when the tty is stopped
2829 */
2830static void con_stop(struct tty_struct *tty)
2831{
2832 int console_num;
2833 if (!tty)
2834 return;
2835 console_num = tty->index;
2836 if (!vc_cons_allocated(console_num))
2837 return;
2838 vt_kbd_con_stop(console_num);
2839}
2840
2841/*
2842 * Turn the Scroll-Lock LED off when the console is started
2843 */
2844static void con_start(struct tty_struct *tty)
2845{
2846 int console_num;
2847 if (!tty)
2848 return;
2849 console_num = tty->index;
2850 if (!vc_cons_allocated(console_num))
2851 return;
2852 vt_kbd_con_start(console_num);
2853}
2854
2855static void con_flush_chars(struct tty_struct *tty)
2856{
2857 struct vc_data *vc;
2858
2859 if (in_interrupt()) /* from flush_to_ldisc */
2860 return;
2861
2862 /* if we race with con_close(), vt may be null */
2863 console_lock();
2864 vc = tty->driver_data;
2865 if (vc)
2866 set_cursor(vc);
2867 console_unlock();
2868}
2869
2870/*
2871 * Allocate the console screen memory.
2872 */
2873static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2874{
2875 unsigned int currcons = tty->index;
2876 struct vc_data *vc;
2877 int ret;
2878
2879 console_lock();
2880 ret = vc_allocate(currcons);
2881 if (ret)
2882 goto unlock;
2883
2884 vc = vc_cons[currcons].d;
2885
2886 /* Still being freed */
2887 if (vc->port.tty) {
2888 ret = -ERESTARTSYS;
2889 goto unlock;
2890 }
2891
2892 ret = tty_port_install(&vc->port, driver, tty);
2893 if (ret)
2894 goto unlock;
2895
2896 tty->driver_data = vc;
2897 vc->port.tty = tty;
2898
2899 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2900 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2901 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2902 }
2903 if (vc->vc_utf)
2904 tty->termios.c_iflag |= IUTF8;
2905 else
2906 tty->termios.c_iflag &= ~IUTF8;
2907unlock:
2908 console_unlock();
2909 return ret;
2910}
2911
2912static int con_open(struct tty_struct *tty, struct file *filp)
2913{
2914 /* everything done in install */
2915 return 0;
2916}
2917
2918
2919static void con_close(struct tty_struct *tty, struct file *filp)
2920{
2921 /* Nothing to do - we defer to shutdown */
2922}
2923
2924static void con_shutdown(struct tty_struct *tty)
2925{
2926 struct vc_data *vc = tty->driver_data;
2927 BUG_ON(vc == NULL);
2928 console_lock();
2929 vc->port.tty = NULL;
2930 console_unlock();
2931}
2932
2933static int default_color = 7; /* white */
2934static int default_italic_color = 2; // green (ASCII)
2935static int default_underline_color = 3; // cyan (ASCII)
2936module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2937module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2938module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2939
2940static void vc_init(struct vc_data *vc, unsigned int rows,
2941 unsigned int cols, int do_clear)
2942{
2943 int j, k ;
2944
2945 vc->vc_cols = cols;
2946 vc->vc_rows = rows;
2947 vc->vc_size_row = cols << 1;
2948 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2949
2950 set_origin(vc);
2951 vc->vc_pos = vc->vc_origin;
2952 reset_vc(vc);
2953 for (j=k=0; j<16; j++) {
2954 vc->vc_palette[k++] = default_red[j] ;
2955 vc->vc_palette[k++] = default_grn[j] ;
2956 vc->vc_palette[k++] = default_blu[j] ;
2957 }
2958 vc->vc_def_color = default_color;
2959 vc->vc_ulcolor = default_underline_color;
2960 vc->vc_itcolor = default_italic_color;
2961 vc->vc_halfcolor = 0x08; /* grey */
2962 init_waitqueue_head(&vc->paste_wait);
2963 reset_terminal(vc, do_clear);
2964}
2965
2966/*
2967 * This routine initializes console interrupts, and does nothing
2968 * else. If you want the screen to clear, call tty_write with
2969 * the appropriate escape-sequence.
2970 */
2971
2972static int __init con_init(void)
2973{
2974 const char *display_desc = NULL;
2975 struct vc_data *vc;
2976 unsigned int currcons = 0, i;
2977
2978 console_lock();
2979
2980 if (conswitchp)
2981 display_desc = conswitchp->con_startup();
2982 if (!display_desc) {
2983 fg_console = 0;
2984 console_unlock();
2985 return 0;
2986 }
2987
2988 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2989 struct con_driver *con_driver = ®istered_con_driver[i];
2990
2991 if (con_driver->con == NULL) {
2992 con_driver->con = conswitchp;
2993 con_driver->desc = display_desc;
2994 con_driver->flag = CON_DRIVER_FLAG_INIT;
2995 con_driver->first = 0;
2996 con_driver->last = MAX_NR_CONSOLES - 1;
2997 break;
2998 }
2999 }
3000
3001 for (i = 0; i < MAX_NR_CONSOLES; i++)
3002 con_driver_map[i] = conswitchp;
3003
3004 if (blankinterval) {
3005 blank_state = blank_normal_wait;
3006 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3007 }
3008
3009 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3010 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3011 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3012 tty_port_init(&vc->port);
3013 visual_init(vc, currcons, 1);
3014 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3015 vc_init(vc, vc->vc_rows, vc->vc_cols,
3016 currcons || !vc->vc_sw->con_save_screen);
3017 }
3018 currcons = fg_console = 0;
3019 master_display_fg = vc = vc_cons[currcons].d;
3020 set_origin(vc);
3021 save_screen(vc);
3022 gotoxy(vc, vc->vc_x, vc->vc_y);
3023 csi_J(vc, 0);
3024 update_screen(vc);
3025 pr_info("Console: %s %s %dx%d\n",
3026 vc->vc_can_do_color ? "colour" : "mono",
3027 display_desc, vc->vc_cols, vc->vc_rows);
3028 printable = 1;
3029
3030 console_unlock();
3031
3032#ifdef CONFIG_VT_CONSOLE
3033 register_console(&vt_console_driver);
3034#endif
3035 return 0;
3036}
3037console_initcall(con_init);
3038
3039static const struct tty_operations con_ops = {
3040 .install = con_install,
3041 .open = con_open,
3042 .close = con_close,
3043 .write = con_write,
3044 .write_room = con_write_room,
3045 .put_char = con_put_char,
3046 .flush_chars = con_flush_chars,
3047 .chars_in_buffer = con_chars_in_buffer,
3048 .ioctl = vt_ioctl,
3049#ifdef CONFIG_COMPAT
3050 .compat_ioctl = vt_compat_ioctl,
3051#endif
3052 .stop = con_stop,
3053 .start = con_start,
3054 .throttle = con_throttle,
3055 .unthrottle = con_unthrottle,
3056 .resize = vt_resize,
3057 .shutdown = con_shutdown
3058};
3059
3060static struct cdev vc0_cdev;
3061
3062static ssize_t show_tty_active(struct device *dev,
3063 struct device_attribute *attr, char *buf)
3064{
3065 return sprintf(buf, "tty%d\n", fg_console + 1);
3066}
3067static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3068
3069static struct attribute *vt_dev_attrs[] = {
3070 &dev_attr_active.attr,
3071 NULL
3072};
3073
3074ATTRIBUTE_GROUPS(vt_dev);
3075
3076int __init vty_init(const struct file_operations *console_fops)
3077{
3078 cdev_init(&vc0_cdev, console_fops);
3079 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3080 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3081 panic("Couldn't register /dev/tty0 driver\n");
3082 tty0dev = device_create_with_groups(tty_class, NULL,
3083 MKDEV(TTY_MAJOR, 0), NULL,
3084 vt_dev_groups, "tty0");
3085 if (IS_ERR(tty0dev))
3086 tty0dev = NULL;
3087
3088 vcs_init();
3089
3090 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3091 if (!console_driver)
3092 panic("Couldn't allocate console driver\n");
3093
3094 console_driver->name = "tty";
3095 console_driver->name_base = 1;
3096 console_driver->major = TTY_MAJOR;
3097 console_driver->minor_start = 1;
3098 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3099 console_driver->init_termios = tty_std_termios;
3100 if (default_utf8)
3101 console_driver->init_termios.c_iflag |= IUTF8;
3102 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3103 tty_set_operations(console_driver, &con_ops);
3104 if (tty_register_driver(console_driver))
3105 panic("Couldn't register console driver\n");
3106 kbd_init();
3107 console_map_init();
3108#ifdef CONFIG_MDA_CONSOLE
3109 mda_console_init();
3110#endif
3111 return 0;
3112}
3113
3114#ifndef VT_SINGLE_DRIVER
3115
3116static struct class *vtconsole_class;
3117
3118static int do_bind_con_driver(const struct consw *csw, int first, int last,
3119 int deflt)
3120{
3121 struct module *owner = csw->owner;
3122 const char *desc = NULL;
3123 struct con_driver *con_driver;
3124 int i, j = -1, k = -1, retval = -ENODEV;
3125
3126 if (!try_module_get(owner))
3127 return -ENODEV;
3128
3129 WARN_CONSOLE_UNLOCKED();
3130
3131 /* check if driver is registered */
3132 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3133 con_driver = ®istered_con_driver[i];
3134
3135 if (con_driver->con == csw) {
3136 desc = con_driver->desc;
3137 retval = 0;
3138 break;
3139 }
3140 }
3141
3142 if (retval)
3143 goto err;
3144
3145 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3146 csw->con_startup();
3147 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3148 }
3149
3150 if (deflt) {
3151 if (conswitchp)
3152 module_put(conswitchp->owner);
3153
3154 __module_get(owner);
3155 conswitchp = csw;
3156 }
3157
3158 first = max(first, con_driver->first);
3159 last = min(last, con_driver->last);
3160
3161 for (i = first; i <= last; i++) {
3162 int old_was_color;
3163 struct vc_data *vc = vc_cons[i].d;
3164
3165 if (con_driver_map[i])
3166 module_put(con_driver_map[i]->owner);
3167 __module_get(owner);
3168 con_driver_map[i] = csw;
3169
3170 if (!vc || !vc->vc_sw)
3171 continue;
3172
3173 j = i;
3174
3175 if (con_is_visible(vc)) {
3176 k = i;
3177 save_screen(vc);
3178 }
3179
3180 old_was_color = vc->vc_can_do_color;
3181 vc->vc_sw->con_deinit(vc);
3182 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3183 visual_init(vc, i, 0);
3184 set_origin(vc);
3185 update_attr(vc);
3186
3187 /* If the console changed between mono <-> color, then
3188 * the attributes in the screenbuf will be wrong. The
3189 * following resets all attributes to something sane.
3190 */
3191 if (old_was_color != vc->vc_can_do_color)
3192 clear_buffer_attributes(vc);
3193 }
3194
3195 pr_info("Console: switching ");
3196 if (!deflt)
3197 pr_cont("consoles %d-%d ", first + 1, last + 1);
3198 if (j >= 0) {
3199 struct vc_data *vc = vc_cons[j].d;
3200
3201 pr_cont("to %s %s %dx%d\n",
3202 vc->vc_can_do_color ? "colour" : "mono",
3203 desc, vc->vc_cols, vc->vc_rows);
3204
3205 if (k >= 0) {
3206 vc = vc_cons[k].d;
3207 update_screen(vc);
3208 }
3209 } else {
3210 pr_cont("to %s\n", desc);
3211 }
3212
3213 retval = 0;
3214err:
3215 module_put(owner);
3216 return retval;
3217};
3218
3219
3220#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3221/* unlocked version of unbind_con_driver() */
3222int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3223{
3224 struct module *owner = csw->owner;
3225 const struct consw *defcsw = NULL;
3226 struct con_driver *con_driver = NULL, *con_back = NULL;
3227 int i, retval = -ENODEV;
3228
3229 if (!try_module_get(owner))
3230 return -ENODEV;
3231
3232 WARN_CONSOLE_UNLOCKED();
3233
3234 /* check if driver is registered and if it is unbindable */
3235 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3236 con_driver = ®istered_con_driver[i];
3237
3238 if (con_driver->con == csw &&
3239 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3240 retval = 0;
3241 break;
3242 }
3243 }
3244
3245 if (retval)
3246 goto err;
3247
3248 retval = -ENODEV;
3249
3250 /* check if backup driver exists */
3251 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3252 con_back = ®istered_con_driver[i];
3253
3254 if (con_back->con && con_back->con != csw) {
3255 defcsw = con_back->con;
3256 retval = 0;
3257 break;
3258 }
3259 }
3260
3261 if (retval)
3262 goto err;
3263
3264 if (!con_is_bound(csw))
3265 goto err;
3266
3267 first = max(first, con_driver->first);
3268 last = min(last, con_driver->last);
3269
3270 for (i = first; i <= last; i++) {
3271 if (con_driver_map[i] == csw) {
3272 module_put(csw->owner);
3273 con_driver_map[i] = NULL;
3274 }
3275 }
3276
3277 if (!con_is_bound(defcsw)) {
3278 const struct consw *defconsw = conswitchp;
3279
3280 defcsw->con_startup();
3281 con_back->flag |= CON_DRIVER_FLAG_INIT;
3282 /*
3283 * vgacon may change the default driver to point
3284 * to dummycon, we restore it here...
3285 */
3286 conswitchp = defconsw;
3287 }
3288
3289 if (!con_is_bound(csw))
3290 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3291
3292 /* ignore return value, binding should not fail */
3293 do_bind_con_driver(defcsw, first, last, deflt);
3294err:
3295 module_put(owner);
3296 return retval;
3297
3298}
3299EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3300
3301static int vt_bind(struct con_driver *con)
3302{
3303 const struct consw *defcsw = NULL, *csw = NULL;
3304 int i, more = 1, first = -1, last = -1, deflt = 0;
3305
3306 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3307 goto err;
3308
3309 csw = con->con;
3310
3311 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3312 struct con_driver *con = ®istered_con_driver[i];
3313
3314 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3315 defcsw = con->con;
3316 break;
3317 }
3318 }
3319
3320 if (!defcsw)
3321 goto err;
3322
3323 while (more) {
3324 more = 0;
3325
3326 for (i = con->first; i <= con->last; i++) {
3327 if (con_driver_map[i] == defcsw) {
3328 if (first == -1)
3329 first = i;
3330 last = i;
3331 more = 1;
3332 } else if (first != -1)
3333 break;
3334 }
3335
3336 if (first == 0 && last == MAX_NR_CONSOLES -1)
3337 deflt = 1;
3338
3339 if (first != -1)
3340 do_bind_con_driver(csw, first, last, deflt);
3341
3342 first = -1;
3343 last = -1;
3344 deflt = 0;
3345 }
3346
3347err:
3348 return 0;
3349}
3350
3351static int vt_unbind(struct con_driver *con)
3352{
3353 const struct consw *csw = NULL;
3354 int i, more = 1, first = -1, last = -1, deflt = 0;
3355 int ret;
3356
3357 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3358 goto err;
3359
3360 csw = con->con;
3361
3362 while (more) {
3363 more = 0;
3364
3365 for (i = con->first; i <= con->last; i++) {
3366 if (con_driver_map[i] == csw) {
3367 if (first == -1)
3368 first = i;
3369 last = i;
3370 more = 1;
3371 } else if (first != -1)
3372 break;
3373 }
3374
3375 if (first == 0 && last == MAX_NR_CONSOLES -1)
3376 deflt = 1;
3377
3378 if (first != -1) {
3379 ret = do_unbind_con_driver(csw, first, last, deflt);
3380 if (ret != 0)
3381 return ret;
3382 }
3383
3384 first = -1;
3385 last = -1;
3386 deflt = 0;
3387 }
3388
3389err:
3390 return 0;
3391}
3392#else
3393static inline int vt_bind(struct con_driver *con)
3394{
3395 return 0;
3396}
3397static inline int vt_unbind(struct con_driver *con)
3398{
3399 return 0;
3400}
3401#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3402
3403static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3404 const char *buf, size_t count)
3405{
3406 struct con_driver *con = dev_get_drvdata(dev);
3407 int bind = simple_strtoul(buf, NULL, 0);
3408
3409 console_lock();
3410
3411 if (bind)
3412 vt_bind(con);
3413 else
3414 vt_unbind(con);
3415
3416 console_unlock();
3417
3418 return count;
3419}
3420
3421static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3422 char *buf)
3423{
3424 struct con_driver *con = dev_get_drvdata(dev);
3425 int bind = con_is_bound(con->con);
3426
3427 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3428}
3429
3430static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3431 char *buf)
3432{
3433 struct con_driver *con = dev_get_drvdata(dev);
3434
3435 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3436 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3437 con->desc);
3438
3439}
3440
3441static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3442static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3443
3444static struct attribute *con_dev_attrs[] = {
3445 &dev_attr_bind.attr,
3446 &dev_attr_name.attr,
3447 NULL
3448};
3449
3450ATTRIBUTE_GROUPS(con_dev);
3451
3452static int vtconsole_init_device(struct con_driver *con)
3453{
3454 con->flag |= CON_DRIVER_FLAG_ATTR;
3455 return 0;
3456}
3457
3458static void vtconsole_deinit_device(struct con_driver *con)
3459{
3460 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3461}
3462
3463/**
3464 * con_is_bound - checks if driver is bound to the console
3465 * @csw: console driver
3466 *
3467 * RETURNS: zero if unbound, nonzero if bound
3468 *
3469 * Drivers can call this and if zero, they should release
3470 * all resources allocated on con_startup()
3471 */
3472int con_is_bound(const struct consw *csw)
3473{
3474 int i, bound = 0;
3475
3476 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3477 if (con_driver_map[i] == csw) {
3478 bound = 1;
3479 break;
3480 }
3481 }
3482
3483 return bound;
3484}
3485EXPORT_SYMBOL(con_is_bound);
3486
3487/**
3488 * con_debug_enter - prepare the console for the kernel debugger
3489 * @sw: console driver
3490 *
3491 * Called when the console is taken over by the kernel debugger, this
3492 * function needs to save the current console state, then put the console
3493 * into a state suitable for the kernel debugger.
3494 *
3495 * RETURNS:
3496 * Zero on success, nonzero if a failure occurred when trying to prepare
3497 * the console for the debugger.
3498 */
3499int con_debug_enter(struct vc_data *vc)
3500{
3501 int ret = 0;
3502
3503 saved_fg_console = fg_console;
3504 saved_last_console = last_console;
3505 saved_want_console = want_console;
3506 saved_vc_mode = vc->vc_mode;
3507 saved_console_blanked = console_blanked;
3508 vc->vc_mode = KD_TEXT;
3509 console_blanked = 0;
3510 if (vc->vc_sw->con_debug_enter)
3511 ret = vc->vc_sw->con_debug_enter(vc);
3512#ifdef CONFIG_KGDB_KDB
3513 /* Set the initial LINES variable if it is not already set */
3514 if (vc->vc_rows < 999) {
3515 int linecount;
3516 char lns[4];
3517 const char *setargs[3] = {
3518 "set",
3519 "LINES",
3520 lns,
3521 };
3522 if (kdbgetintenv(setargs[0], &linecount)) {
3523 snprintf(lns, 4, "%i", vc->vc_rows);
3524 kdb_set(2, setargs);
3525 }
3526 }
3527 if (vc->vc_cols < 999) {
3528 int colcount;
3529 char cols[4];
3530 const char *setargs[3] = {
3531 "set",
3532 "COLUMNS",
3533 cols,
3534 };
3535 if (kdbgetintenv(setargs[0], &colcount)) {
3536 snprintf(cols, 4, "%i", vc->vc_cols);
3537 kdb_set(2, setargs);
3538 }
3539 }
3540#endif /* CONFIG_KGDB_KDB */
3541 return ret;
3542}
3543EXPORT_SYMBOL_GPL(con_debug_enter);
3544
3545/**
3546 * con_debug_leave - restore console state
3547 * @sw: console driver
3548 *
3549 * Restore the console state to what it was before the kernel debugger
3550 * was invoked.
3551 *
3552 * RETURNS:
3553 * Zero on success, nonzero if a failure occurred when trying to restore
3554 * the console.
3555 */
3556int con_debug_leave(void)
3557{
3558 struct vc_data *vc;
3559 int ret = 0;
3560
3561 fg_console = saved_fg_console;
3562 last_console = saved_last_console;
3563 want_console = saved_want_console;
3564 console_blanked = saved_console_blanked;
3565 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3566
3567 vc = vc_cons[fg_console].d;
3568 if (vc->vc_sw->con_debug_leave)
3569 ret = vc->vc_sw->con_debug_leave(vc);
3570 return ret;
3571}
3572EXPORT_SYMBOL_GPL(con_debug_leave);
3573
3574static int do_register_con_driver(const struct consw *csw, int first, int last)
3575{
3576 struct module *owner = csw->owner;
3577 struct con_driver *con_driver;
3578 const char *desc;
3579 int i, retval;
3580
3581 WARN_CONSOLE_UNLOCKED();
3582
3583 if (!try_module_get(owner))
3584 return -ENODEV;
3585
3586 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3587 con_driver = ®istered_con_driver[i];
3588
3589 /* already registered */
3590 if (con_driver->con == csw) {
3591 retval = -EBUSY;
3592 goto err;
3593 }
3594 }
3595
3596 desc = csw->con_startup();
3597 if (!desc) {
3598 retval = -ENODEV;
3599 goto err;
3600 }
3601
3602 retval = -EINVAL;
3603
3604 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3605 con_driver = ®istered_con_driver[i];
3606
3607 if (con_driver->con == NULL &&
3608 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3609 con_driver->con = csw;
3610 con_driver->desc = desc;
3611 con_driver->node = i;
3612 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3613 CON_DRIVER_FLAG_INIT;
3614 con_driver->first = first;
3615 con_driver->last = last;
3616 retval = 0;
3617 break;
3618 }
3619 }
3620
3621 if (retval)
3622 goto err;
3623
3624 con_driver->dev =
3625 device_create_with_groups(vtconsole_class, NULL,
3626 MKDEV(0, con_driver->node),
3627 con_driver, con_dev_groups,
3628 "vtcon%i", con_driver->node);
3629 if (IS_ERR(con_driver->dev)) {
3630 pr_warn("Unable to create device for %s; errno = %ld\n",
3631 con_driver->desc, PTR_ERR(con_driver->dev));
3632 con_driver->dev = NULL;
3633 } else {
3634 vtconsole_init_device(con_driver);
3635 }
3636
3637err:
3638 module_put(owner);
3639 return retval;
3640}
3641
3642
3643/**
3644 * do_unregister_con_driver - unregister console driver from console layer
3645 * @csw: console driver
3646 *
3647 * DESCRIPTION: All drivers that registers to the console layer must
3648 * call this function upon exit, or if the console driver is in a state
3649 * where it won't be able to handle console services, such as the
3650 * framebuffer console without loaded framebuffer drivers.
3651 *
3652 * The driver must unbind first prior to unregistration.
3653 */
3654int do_unregister_con_driver(const struct consw *csw)
3655{
3656 int i;
3657
3658 /* cannot unregister a bound driver */
3659 if (con_is_bound(csw))
3660 return -EBUSY;
3661
3662 if (csw == conswitchp)
3663 return -EINVAL;
3664
3665 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3666 struct con_driver *con_driver = ®istered_con_driver[i];
3667
3668 if (con_driver->con == csw) {
3669 /*
3670 * Defer the removal of the sysfs entries since that
3671 * will acquire the kernfs s_active lock and we can't
3672 * acquire this lock while holding the console lock:
3673 * the unbind sysfs entry imposes already the opposite
3674 * order. Reset con already here to prevent any later
3675 * lookup to succeed and mark this slot as zombie, so
3676 * it won't get reused until we complete the removal
3677 * in the deferred work.
3678 */
3679 con_driver->con = NULL;
3680 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3681 schedule_work(&con_driver_unregister_work);
3682
3683 return 0;
3684 }
3685 }
3686
3687 return -ENODEV;
3688}
3689EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3690
3691static void con_driver_unregister_callback(struct work_struct *ignored)
3692{
3693 int i;
3694
3695 console_lock();
3696
3697 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3698 struct con_driver *con_driver = ®istered_con_driver[i];
3699
3700 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3701 continue;
3702
3703 console_unlock();
3704
3705 vtconsole_deinit_device(con_driver);
3706 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3707
3708 console_lock();
3709
3710 if (WARN_ON_ONCE(con_driver->con))
3711 con_driver->con = NULL;
3712 con_driver->desc = NULL;
3713 con_driver->dev = NULL;
3714 con_driver->node = 0;
3715 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3716 con_driver->flag = 0;
3717 con_driver->first = 0;
3718 con_driver->last = 0;
3719 }
3720
3721 console_unlock();
3722}
3723
3724/*
3725 * If we support more console drivers, this function is used
3726 * when a driver wants to take over some existing consoles
3727 * and become default driver for newly opened ones.
3728 *
3729 * do_take_over_console is basically a register followed by unbind
3730 */
3731int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3732{
3733 int err;
3734
3735 err = do_register_con_driver(csw, first, last);
3736 /*
3737 * If we get an busy error we still want to bind the console driver
3738 * and return success, as we may have unbound the console driver
3739 * but not unregistered it.
3740 */
3741 if (err == -EBUSY)
3742 err = 0;
3743 if (!err)
3744 do_bind_con_driver(csw, first, last, deflt);
3745
3746 return err;
3747}
3748EXPORT_SYMBOL_GPL(do_take_over_console);
3749
3750
3751/*
3752 * give_up_console is a wrapper to unregister_con_driver. It will only
3753 * work if driver is fully unbound.
3754 */
3755void give_up_console(const struct consw *csw)
3756{
3757 console_lock();
3758 do_unregister_con_driver(csw);
3759 console_unlock();
3760}
3761
3762static int __init vtconsole_class_init(void)
3763{
3764 int i;
3765
3766 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3767 if (IS_ERR(vtconsole_class)) {
3768 pr_warn("Unable to create vt console class; errno = %ld\n",
3769 PTR_ERR(vtconsole_class));
3770 vtconsole_class = NULL;
3771 }
3772
3773 /* Add system drivers to sysfs */
3774 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3775 struct con_driver *con = ®istered_con_driver[i];
3776
3777 if (con->con && !con->dev) {
3778 con->dev =
3779 device_create_with_groups(vtconsole_class, NULL,
3780 MKDEV(0, con->node),
3781 con, con_dev_groups,
3782 "vtcon%i", con->node);
3783
3784 if (IS_ERR(con->dev)) {
3785 pr_warn("Unable to create device for %s; errno = %ld\n",
3786 con->desc, PTR_ERR(con->dev));
3787 con->dev = NULL;
3788 } else {
3789 vtconsole_init_device(con);
3790 }
3791 }
3792 }
3793
3794 return 0;
3795}
3796postcore_initcall(vtconsole_class_init);
3797
3798#endif
3799
3800/*
3801 * Screen blanking
3802 */
3803
3804static int set_vesa_blanking(char __user *p)
3805{
3806 unsigned int mode;
3807
3808 if (get_user(mode, p + 1))
3809 return -EFAULT;
3810
3811 vesa_blank_mode = (mode < 4) ? mode : 0;
3812 return 0;
3813}
3814
3815void do_blank_screen(int entering_gfx)
3816{
3817 struct vc_data *vc = vc_cons[fg_console].d;
3818 int i;
3819
3820 WARN_CONSOLE_UNLOCKED();
3821
3822 if (console_blanked) {
3823 if (blank_state == blank_vesa_wait) {
3824 blank_state = blank_off;
3825 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3826 }
3827 return;
3828 }
3829
3830 /* entering graphics mode? */
3831 if (entering_gfx) {
3832 hide_cursor(vc);
3833 save_screen(vc);
3834 vc->vc_sw->con_blank(vc, -1, 1);
3835 console_blanked = fg_console + 1;
3836 blank_state = blank_off;
3837 set_origin(vc);
3838 return;
3839 }
3840
3841 if (blank_state != blank_normal_wait)
3842 return;
3843 blank_state = blank_off;
3844
3845 /* don't blank graphics */
3846 if (vc->vc_mode != KD_TEXT) {
3847 console_blanked = fg_console + 1;
3848 return;
3849 }
3850
3851 hide_cursor(vc);
3852 del_timer_sync(&console_timer);
3853 blank_timer_expired = 0;
3854
3855 save_screen(vc);
3856 /* In case we need to reset origin, blanking hook returns 1 */
3857 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3858 console_blanked = fg_console + 1;
3859 if (i)
3860 set_origin(vc);
3861
3862 if (console_blank_hook && console_blank_hook(1))
3863 return;
3864
3865 if (vesa_off_interval && vesa_blank_mode) {
3866 blank_state = blank_vesa_wait;
3867 mod_timer(&console_timer, jiffies + vesa_off_interval);
3868 }
3869 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3870}
3871EXPORT_SYMBOL(do_blank_screen);
3872
3873/*
3874 * Called by timer as well as from vt_console_driver
3875 */
3876void do_unblank_screen(int leaving_gfx)
3877{
3878 struct vc_data *vc;
3879
3880 /* This should now always be called from a "sane" (read: can schedule)
3881 * context for the sake of the low level drivers, except in the special
3882 * case of oops_in_progress
3883 */
3884 if (!oops_in_progress)
3885 might_sleep();
3886
3887 WARN_CONSOLE_UNLOCKED();
3888
3889 ignore_poke = 0;
3890 if (!console_blanked)
3891 return;
3892 if (!vc_cons_allocated(fg_console)) {
3893 /* impossible */
3894 pr_warn("unblank_screen: tty %d not allocated ??\n",
3895 fg_console + 1);
3896 return;
3897 }
3898 vc = vc_cons[fg_console].d;
3899 /* Try to unblank in oops case too */
3900 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3901 return; /* but leave console_blanked != 0 */
3902
3903 if (blankinterval) {
3904 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3905 blank_state = blank_normal_wait;
3906 }
3907
3908 console_blanked = 0;
3909 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3910 /* Low-level driver cannot restore -> do it ourselves */
3911 update_screen(vc);
3912 if (console_blank_hook)
3913 console_blank_hook(0);
3914 set_palette(vc);
3915 set_cursor(vc);
3916 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3917}
3918EXPORT_SYMBOL(do_unblank_screen);
3919
3920/*
3921 * This is called by the outside world to cause a forced unblank, mostly for
3922 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3923 * call it with 1 as an argument and so force a mode restore... that may kill
3924 * X or at least garbage the screen but would also make the Oops visible...
3925 */
3926void unblank_screen(void)
3927{
3928 do_unblank_screen(0);
3929}
3930
3931/*
3932 * We defer the timer blanking to work queue so it can take the console mutex
3933 * (console operations can still happen at irq time, but only from printk which
3934 * has the console mutex. Not perfect yet, but better than no locking
3935 */
3936static void blank_screen_t(struct timer_list *unused)
3937{
3938 blank_timer_expired = 1;
3939 schedule_work(&console_work);
3940}
3941
3942void poke_blanked_console(void)
3943{
3944 WARN_CONSOLE_UNLOCKED();
3945
3946 /* Add this so we quickly catch whoever might call us in a non
3947 * safe context. Nowadays, unblank_screen() isn't to be called in
3948 * atomic contexts and is allowed to schedule (with the special case
3949 * of oops_in_progress, but that isn't of any concern for this
3950 * function. --BenH.
3951 */
3952 might_sleep();
3953
3954 /* This isn't perfectly race free, but a race here would be mostly harmless,
3955 * at worse, we'll do a spurrious blank and it's unlikely
3956 */
3957 del_timer(&console_timer);
3958 blank_timer_expired = 0;
3959
3960 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3961 return;
3962 if (console_blanked)
3963 unblank_screen();
3964 else if (blankinterval) {
3965 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3966 blank_state = blank_normal_wait;
3967 }
3968}
3969
3970/*
3971 * Palettes
3972 */
3973
3974static void set_palette(struct vc_data *vc)
3975{
3976 WARN_CONSOLE_UNLOCKED();
3977
3978 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
3979 vc->vc_sw->con_set_palette(vc, color_table);
3980}
3981
3982/*
3983 * Load palette into the DAC registers. arg points to a colour
3984 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3985 */
3986
3987int con_set_cmap(unsigned char __user *arg)
3988{
3989 int i, j, k;
3990 unsigned char colormap[3*16];
3991
3992 if (copy_from_user(colormap, arg, sizeof(colormap)))
3993 return -EFAULT;
3994
3995 console_lock();
3996 for (i = k = 0; i < 16; i++) {
3997 default_red[i] = colormap[k++];
3998 default_grn[i] = colormap[k++];
3999 default_blu[i] = colormap[k++];
4000 }
4001 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4002 if (!vc_cons_allocated(i))
4003 continue;
4004 for (j = k = 0; j < 16; j++) {
4005 vc_cons[i].d->vc_palette[k++] = default_red[j];
4006 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4007 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4008 }
4009 set_palette(vc_cons[i].d);
4010 }
4011 console_unlock();
4012
4013 return 0;
4014}
4015
4016int con_get_cmap(unsigned char __user *arg)
4017{
4018 int i, k;
4019 unsigned char colormap[3*16];
4020
4021 console_lock();
4022 for (i = k = 0; i < 16; i++) {
4023 colormap[k++] = default_red[i];
4024 colormap[k++] = default_grn[i];
4025 colormap[k++] = default_blu[i];
4026 }
4027 console_unlock();
4028
4029 if (copy_to_user(arg, colormap, sizeof(colormap)))
4030 return -EFAULT;
4031
4032 return 0;
4033}
4034
4035void reset_palette(struct vc_data *vc)
4036{
4037 int j, k;
4038 for (j=k=0; j<16; j++) {
4039 vc->vc_palette[k++] = default_red[j];
4040 vc->vc_palette[k++] = default_grn[j];
4041 vc->vc_palette[k++] = default_blu[j];
4042 }
4043 set_palette(vc);
4044}
4045
4046/*
4047 * Font switching
4048 *
4049 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4050 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4051 * depending on width) reserved for each character which is kinda wasty, but
4052 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4053 * is up to the actual low-level console-driver convert data into its favorite
4054 * format (maybe we should add a `fontoffset' field to the `display'
4055 * structure so we won't have to convert the fontdata all the time.
4056 * /Jes
4057 */
4058
4059#define max_font_size 65536
4060
4061static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4062{
4063 struct console_font font;
4064 int rc = -EINVAL;
4065 int c;
4066
4067 if (op->data) {
4068 font.data = kmalloc(max_font_size, GFP_KERNEL);
4069 if (!font.data)
4070 return -ENOMEM;
4071 } else
4072 font.data = NULL;
4073
4074 console_lock();
4075 if (vc->vc_mode != KD_TEXT)
4076 rc = -EINVAL;
4077 else if (vc->vc_sw->con_font_get)
4078 rc = vc->vc_sw->con_font_get(vc, &font);
4079 else
4080 rc = -ENOSYS;
4081 console_unlock();
4082
4083 if (rc)
4084 goto out;
4085
4086 c = (font.width+7)/8 * 32 * font.charcount;
4087
4088 if (op->data && font.charcount > op->charcount)
4089 rc = -ENOSPC;
4090 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4091 if (font.width > op->width || font.height > op->height)
4092 rc = -ENOSPC;
4093 } else {
4094 if (font.width != 8)
4095 rc = -EIO;
4096 else if ((op->height && font.height > op->height) ||
4097 font.height > 32)
4098 rc = -ENOSPC;
4099 }
4100 if (rc)
4101 goto out;
4102
4103 op->height = font.height;
4104 op->width = font.width;
4105 op->charcount = font.charcount;
4106
4107 if (op->data && copy_to_user(op->data, font.data, c))
4108 rc = -EFAULT;
4109
4110out:
4111 kfree(font.data);
4112 return rc;
4113}
4114
4115static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4116{
4117 struct console_font font;
4118 int rc = -EINVAL;
4119 int size;
4120
4121 if (vc->vc_mode != KD_TEXT)
4122 return -EINVAL;
4123 if (!op->data)
4124 return -EINVAL;
4125 if (op->charcount > 512)
4126 return -EINVAL;
4127 if (op->width <= 0 || op->width > 32 || op->height > 32)
4128 return -EINVAL;
4129 size = (op->width+7)/8 * 32 * op->charcount;
4130 if (size > max_font_size)
4131 return -ENOSPC;
4132
4133 font.data = memdup_user(op->data, size);
4134 if (IS_ERR(font.data))
4135 return PTR_ERR(font.data);
4136
4137 if (!op->height) { /* Need to guess font height [compat] */
4138 int h, i;
4139 u8 *charmap = font.data;
4140
4141 /*
4142 * If from KDFONTOP ioctl, don't allow things which can be done
4143 * in userland,so that we can get rid of this soon
4144 */
4145 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4146 kfree(font.data);
4147 return -EINVAL;
4148 }
4149
4150 for (h = 32; h > 0; h--)
4151 for (i = 0; i < op->charcount; i++)
4152 if (charmap[32*i+h-1])
4153 goto nonzero;
4154
4155 kfree(font.data);
4156 return -EINVAL;
4157
4158 nonzero:
4159 op->height = h;
4160 }
4161
4162 font.charcount = op->charcount;
4163 font.width = op->width;
4164 font.height = op->height;
4165
4166 console_lock();
4167 if (vc->vc_mode != KD_TEXT)
4168 rc = -EINVAL;
4169 else if (vc->vc_sw->con_font_set)
4170 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4171 else
4172 rc = -ENOSYS;
4173 console_unlock();
4174 kfree(font.data);
4175 return rc;
4176}
4177
4178static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4179{
4180 struct console_font font = {.width = op->width, .height = op->height};
4181 char name[MAX_FONT_NAME];
4182 char *s = name;
4183 int rc;
4184
4185
4186 if (!op->data)
4187 s = NULL;
4188 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4189 return -EFAULT;
4190 else
4191 name[MAX_FONT_NAME - 1] = 0;
4192
4193 console_lock();
4194 if (vc->vc_mode != KD_TEXT) {
4195 console_unlock();
4196 return -EINVAL;
4197 }
4198 if (vc->vc_sw->con_font_default)
4199 rc = vc->vc_sw->con_font_default(vc, &font, s);
4200 else
4201 rc = -ENOSYS;
4202 console_unlock();
4203 if (!rc) {
4204 op->width = font.width;
4205 op->height = font.height;
4206 }
4207 return rc;
4208}
4209
4210static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4211{
4212 int con = op->height;
4213 int rc;
4214
4215
4216 console_lock();
4217 if (vc->vc_mode != KD_TEXT)
4218 rc = -EINVAL;
4219 else if (!vc->vc_sw->con_font_copy)
4220 rc = -ENOSYS;
4221 else if (con < 0 || !vc_cons_allocated(con))
4222 rc = -ENOTTY;
4223 else if (con == vc->vc_num) /* nothing to do */
4224 rc = 0;
4225 else
4226 rc = vc->vc_sw->con_font_copy(vc, con);
4227 console_unlock();
4228 return rc;
4229}
4230
4231int con_font_op(struct vc_data *vc, struct console_font_op *op)
4232{
4233 switch (op->op) {
4234 case KD_FONT_OP_SET:
4235 return con_font_set(vc, op);
4236 case KD_FONT_OP_GET:
4237 return con_font_get(vc, op);
4238 case KD_FONT_OP_SET_DEFAULT:
4239 return con_font_default(vc, op);
4240 case KD_FONT_OP_COPY:
4241 return con_font_copy(vc, op);
4242 }
4243 return -ENOSYS;
4244}
4245
4246/*
4247 * Interface exported to selection and vcs.
4248 */
4249
4250/* used by selection */
4251u16 screen_glyph(struct vc_data *vc, int offset)
4252{
4253 u16 w = scr_readw(screenpos(vc, offset, 1));
4254 u16 c = w & 0xff;
4255
4256 if (w & vc->vc_hi_font_mask)
4257 c |= 0x100;
4258 return c;
4259}
4260EXPORT_SYMBOL_GPL(screen_glyph);
4261
4262/* used by vcs - note the word offset */
4263unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4264{
4265 return screenpos(vc, 2 * w_offset, viewed);
4266}
4267EXPORT_SYMBOL_GPL(screen_pos);
4268
4269void getconsxy(struct vc_data *vc, unsigned char *p)
4270{
4271 p[0] = vc->vc_x;
4272 p[1] = vc->vc_y;
4273}
4274
4275void putconsxy(struct vc_data *vc, unsigned char *p)
4276{
4277 hide_cursor(vc);
4278 gotoxy(vc, p[0], p[1]);
4279 set_cursor(vc);
4280}
4281
4282u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4283{
4284 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4285 return softcursor_original;
4286 return scr_readw(org);
4287}
4288
4289void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4290{
4291 scr_writew(val, org);
4292 if ((unsigned long)org == vc->vc_pos) {
4293 softcursor_original = -1;
4294 add_softcursor(vc);
4295 }
4296}
4297
4298void vcs_scr_updated(struct vc_data *vc)
4299{
4300 notify_update(vc);
4301}
4302
4303void vc_scrolldelta_helper(struct vc_data *c, int lines,
4304 unsigned int rolled_over, void *base, unsigned int size)
4305{
4306 unsigned long ubase = (unsigned long)base;
4307 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4308 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4309 ptrdiff_t origin = (void *)c->vc_origin - base;
4310 int margin = c->vc_size_row * 4;
4311 int from, wrap, from_off, avail;
4312
4313 /* Turn scrollback off */
4314 if (!lines) {
4315 c->vc_visible_origin = c->vc_origin;
4316 return;
4317 }
4318
4319 /* Do we have already enough to allow jumping from 0 to the end? */
4320 if (rolled_over > scr_end + margin) {
4321 from = scr_end;
4322 wrap = rolled_over + c->vc_size_row;
4323 } else {
4324 from = 0;
4325 wrap = size;
4326 }
4327
4328 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4329 avail = (origin - from + wrap) % wrap;
4330
4331 /* Only a little piece would be left? Show all incl. the piece! */
4332 if (avail < 2 * margin)
4333 margin = 0;
4334 if (from_off < margin)
4335 from_off = 0;
4336 if (from_off > avail - margin)
4337 from_off = avail;
4338
4339 c->vc_visible_origin = ubase + (from + from_off) % wrap;
4340}
4341EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4342
4343/*
4344 * Visible symbols for modules
4345 */
4346
4347EXPORT_SYMBOL(color_table);
4348EXPORT_SYMBOL(default_red);
4349EXPORT_SYMBOL(default_grn);
4350EXPORT_SYMBOL(default_blu);
4351EXPORT_SYMBOL(update_region);
4352EXPORT_SYMBOL(redraw_screen);
4353EXPORT_SYMBOL(vc_resize);
4354EXPORT_SYMBOL(fg_console);
4355EXPORT_SYMBOL(console_blank_hook);
4356EXPORT_SYMBOL(console_blanked);
4357EXPORT_SYMBOL(vc_cons);
4358EXPORT_SYMBOL(global_cursor_default);
4359#ifndef VT_SINGLE_DRIVER
4360EXPORT_SYMBOL(give_up_console);
4361#endif