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tty: fix out-of-bounds access in tty_driver_lookup_tty()
[linux-2.6-block.git] / drivers / tty / vt / vt.c
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e3b3d0f5 1// SPDX-License-Identifier: GPL-2.0
1da177e4 2/*
1da177e4
LT		 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
e1f8e874 61 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
d4328b40
AT		 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
1da177e4
LT		 72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
3f07c014 76#include <linux/sched/signal.h>
1da177e4
LT		 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>
9a98e7a8 84#include <linux/vmalloc.h>
1da177e4
LT		 85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
c831c338 89#include <linux/mutex.h>
1da177e4
LT		 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>
1da177e4 97#include <linux/workqueue.h>
1da177e4
LT		 98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
b293d758 101#include <linux/notifier.h>
d81ed103
AC		 102#include <linux/device.h>
103#include <linux/io.h>
d81ed103 104#include <linux/uaccess.h>
81d44507 105#include <linux/kdb.h>
74c807ce 106#include <linux/ctype.h>
f0a8d84f 107#include <linux/bsearch.h>
d541ae4e 108#include <linux/gcd.h>
1da177e4 109
3e795de7 110#define MAX_NR_CON_DRIVER 16
1da177e4 111
6db4063c 112#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 115#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
805952a8 120 struct device *dev;
6db4063c 121 int node;
3e795de7
AD		 122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 128const struct consw *conswitchp;
129
1da177e4
LT		 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)
bd63364c 135#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 136
1da177e4
LT		 137struct vc vc_cons [MAX_NR_CONSOLES];
138
139#ifndef VT_SINGLE_DRIVER
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141#endif
142
143static int con_open(struct tty_struct *, struct file *);
144static void vc_init(struct vc_data *vc, unsigned int rows,
145 unsigned int cols, int do_clear);
146static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147static void save_cur(struct vc_data *vc);
148static void reset_terminal(struct vc_data *vc, int do_clear);
149static void con_flush_chars(struct tty_struct *tty);
403aac96 150static int set_vesa_blanking(char __user *p);
1da177e4
LT		 151static void set_cursor(struct vc_data *vc);
152static void hide_cursor(struct vc_data *vc);
65f27f38 153static void console_callback(struct work_struct *ignored);
d364b5c3 154static void con_driver_unregister_callback(struct work_struct *ignored);
24ed960a 155static void blank_screen_t(struct timer_list *unused);
1da177e4 156static void set_palette(struct vc_data *vc);
0a64ce6e 157static void unblank_screen(void);
1da177e4 158
52c40fca
PH		 159#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
160
77bf2bab 161int default_utf8 = true;
042f10ec 162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 165
4dfa3c54 166static int cur_default = CUR_UNDERLINE;
9ea9a886
CL		 167module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
1da177e4
LT		 169/*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 179static int vesa_off_interval;
a4199f5e 180static int blankinterval;
f324edc8 181core_param(consoleblank, blankinterval, int, 0444);
1da177e4 182
65f27f38 183static DECLARE_WORK(console_work, console_callback);
d364b5c3 184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 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,
b45cfba4 190 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 191 */
192int fg_console;
193int last_console;
194int want_console = -1;
fed891c8
JW		 195static int saved_fg_console;
196static int saved_last_console;
197static int saved_want_console;
198static int saved_vc_mode;
beed5336 199static int saved_console_blanked;
1da177e4
LT		 200
201/*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207static struct vc_data *master_display_fg;
208
209/*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216/*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219static int scrollback_delta;
220
221/*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225int (*console_blank_hook)(int);
226
1d27e3e2 227static DEFINE_TIMER(console_timer, blank_screen_t);
1da177e4
LT		 228static int blank_state;
229static int blank_timer_expired;
230enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234};
235
fbc92a34
KS		 236/*
237 * /sys/class/tty/tty0/
238 *
239 * the attribute 'active' contains the name of the current vc
240 * console and it supports poll() to detect vc switches
241 */
242static struct device *tty0dev;
243
b293d758
ST		 244/*
245 * Notifier list for console events.
246 */
247static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249int register_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255int unregister_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261static void notify_write(struct vc_data *vc, unsigned int unicode)
262{
502fcb79 263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
265}
266
267static void notify_update(struct vc_data *vc)
268{
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
271}
1da177e4
LT		 272/*
273 * Low-Level Functions
274 */
275
6ca8dfd7
JS		 276static inline bool con_is_fg(const struct vc_data *vc)
277{
278 return vc->vc_num == fg_console;
279}
280
281static inline bool con_should_update(const struct vc_data *vc)
282{
283 return con_is_visible(vc) && !console_blanked;
284}
1da177e4 285
d73568c4 286static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
b8209f69 287 bool viewed)
1da177e4
LT		 288{
289 unsigned short *p;
290
291 if (!viewed)
292 p = (unsigned short *)(vc->vc_origin + offset);
293 else if (!vc->vc_sw->con_screen_pos)
294 p = (unsigned short *)(vc->vc_visible_origin + offset);
295 else
296 p = vc->vc_sw->con_screen_pos(vc, offset);
297 return p;
298}
299
e33ac1c1 300/* Called from the keyboard irq path.. */
1da177e4
LT		 301static inline void scrolldelta(int lines)
302{
e33ac1c1
AC		 303 /* FIXME */
304 /* scrolldelta needs some kind of consistency lock, but the BKL was
305 and still is not protecting versus the scheduled back end */
1da177e4
LT		 306 scrollback_delta += lines;
307 schedule_console_callback();
308}
309
310void schedule_console_callback(void)
311{
312 schedule_work(&console_work);
313}
314
d8ae7242
NP		 315/*
316 * Code to manage unicode-based screen buffers
317 */
318
319#ifdef NO_VC_UNI_SCREEN
320/* this disables and optimizes related code away at compile time */
321#define get_vc_uniscr(vc) NULL
322#else
323#define get_vc_uniscr(vc) vc->vc_uni_screen
324#endif
325
0224080f
NP		 326#define VC_UNI_SCREEN_DEBUG 0
327
d8ae7242
NP		 328typedef uint32_t char32_t;
329
330/*
331 * Our screen buffer is preceded by an array of line pointers so that
332 * scrolling only implies some pointer shuffling.
333 */
334struct uni_screen {
335 char32_t *lines[0];
336};
337
338static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
339{
340 struct uni_screen *uniscr;
341 void *p;
342 unsigned int memsize, i;
343
344 /* allocate everything in one go */
345 memsize = cols * rows * sizeof(char32_t);
346 memsize += rows * sizeof(char32_t *);
af77c56a 347 p = vzalloc(memsize);
d8ae7242
NP		 348 if (!p)
349 return NULL;
350
351 /* initial line pointers */
352 uniscr = p;
353 p = uniscr->lines + rows;
354 for (i = 0; i < rows; i++) {
355 uniscr->lines[i] = p;
356 p += cols * sizeof(char32_t);
357 }
358 return uniscr;
359}
360
57d38f26
NP		 361static void vc_uniscr_free(struct uni_screen *uniscr)
362{
363 vfree(uniscr);
364}
365
d8ae7242
NP		 366static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
367{
57d38f26 368 vc_uniscr_free(vc->vc_uni_screen);
d8ae7242
NP		 369 vc->vc_uni_screen = new_uniscr;
370}
371
372static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
373{
374 struct uni_screen *uniscr = get_vc_uniscr(vc);
375
376 if (uniscr)
28bc24fc 377 uniscr->lines[vc->state.y][vc->state.x] = uc;
d8ae7242
NP		 378}
379
380static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
381{
382 struct uni_screen *uniscr = get_vc_uniscr(vc);
383
384 if (uniscr) {
28bc24fc
JS		 385 char32_t *ln = uniscr->lines[vc->state.y];
386 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 387
388 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
389 memset32(&ln[x], ' ', nr);
390 }
391}
392
393static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
394{
395 struct uni_screen *uniscr = get_vc_uniscr(vc);
396
397 if (uniscr) {
28bc24fc
JS		 398 char32_t *ln = uniscr->lines[vc->state.y];
399 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 400
401 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
402 memset32(&ln[cols - nr], ' ', nr);
403 }
404}
405
406static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
407 unsigned int nr)
408{
409 struct uni_screen *uniscr = get_vc_uniscr(vc);
410
411 if (uniscr) {
28bc24fc 412 char32_t *ln = uniscr->lines[vc->state.y];
d8ae7242
NP		 413
414 memset32(&ln[x], ' ', nr);
415 }
416}
417
418static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
419 unsigned int nr)
420{
421 struct uni_screen *uniscr = get_vc_uniscr(vc);
422
423 if (uniscr) {
424 unsigned int cols = vc->vc_cols;
425
426 while (nr--)
427 memset32(uniscr->lines[y++], ' ', cols);
428 }
429}
430
431static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
432 enum con_scroll dir, unsigned int nr)
433{
434 struct uni_screen *uniscr = get_vc_uniscr(vc);
435
436 if (uniscr) {
d541ae4e
NP		 437 unsigned int i, j, k, sz, d, clear;
438
439 sz = b - t;
440 clear = b - nr;
441 d = nr;
442 if (dir == SM_DOWN) {
443 clear = t;
444 d = sz - nr;
445 }
446 for (i = 0; i < gcd(d, sz); i++) {
447 char32_t *tmp = uniscr->lines[t + i];
448 j = i;
449 while (1) {
450 k = j + d;
451 if (k >= sz)
452 k -= sz;
453 if (k == i)
454 break;
455 uniscr->lines[t + j] = uniscr->lines[t + k];
456 j = k;
457 }
458 uniscr->lines[t + j] = tmp;
d8ae7242 459 }
d8ae7242
NP		 460 vc_uniscr_clear_lines(vc, clear, nr);
461 }
462}
463
464static void vc_uniscr_copy_area(struct uni_screen *dst,
465 unsigned int dst_cols,
466 unsigned int dst_rows,
467 struct uni_screen *src,
468 unsigned int src_cols,
469 unsigned int src_top_row,
470 unsigned int src_bot_row)
471{
472 unsigned int dst_row = 0;
473
474 if (!dst)
475 return;
476
477 while (src_top_row < src_bot_row) {
478 char32_t *src_line = src->lines[src_top_row];
479 char32_t *dst_line = dst->lines[dst_row];
480
481 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
482 if (dst_cols - src_cols)
483 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
484 src_top_row++;
485 dst_row++;
486 }
487 while (dst_row < dst_rows) {
488 char32_t *dst_line = dst->lines[dst_row];
489
490 memset32(dst_line, ' ', dst_cols);
491 dst_row++;
492 }
493}
494
d21b0be2
NP		 495/*
496 * Called from vcs_read() to make sure unicode screen retrieval is possible.
497 * This will initialize the unicode screen buffer if not already done.
498 * This returns 0 if OK, or a negative error code otherwise.
499 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
500 */
501int vc_uniscr_check(struct vc_data *vc)
502{
503 struct uni_screen *uniscr;
504 unsigned short *p;
505 int x, y, mask;
506
507 if (__is_defined(NO_VC_UNI_SCREEN))
508 return -EOPNOTSUPP;
509
510 WARN_CONSOLE_UNLOCKED();
511
512 if (!vc->vc_utf)
513 return -ENODATA;
514
515 if (vc->vc_uni_screen)
516 return 0;
517
518 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
519 if (!uniscr)
520 return -ENOMEM;
521
522 /*
523 * Let's populate it initially with (imperfect) reverse translation.
524 * This is the next best thing we can do short of having it enabled
525 * from the start even when no users rely on this functionality. True
526 * unicode content will be available after a complete screen refresh.
527 */
528 p = (unsigned short *)vc->vc_origin;
529 mask = vc->vc_hi_font_mask | 0xff;
530 for (y = 0; y < vc->vc_rows; y++) {
531 char32_t *line = uniscr->lines[y];
532 for (x = 0; x < vc->vc_cols; x++) {
533 u16 glyph = scr_readw(p++) & mask;
534 line[x] = inverse_translate(vc, glyph, true);
535 }
536 }
537
538 vc->vc_uni_screen = uniscr;
539 return 0;
540}
541
542/*
543 * Called from vcs_read() to get the unicode data from the screen.
544 * This must be preceded by a successful call to vc_uniscr_check() once
545 * the console lock has been taken.
546 */
b8209f69 547void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
d21b0be2
NP		 548 unsigned int row, unsigned int col, unsigned int nr)
549{
550 struct uni_screen *uniscr = get_vc_uniscr(vc);
708d0bff
NP		 551 int offset = row * vc->vc_size_row + col * 2;
552 unsigned long pos;
d21b0be2
NP		 553
554 BUG_ON(!uniscr);
708d0bff
NP		 555
556 pos = (unsigned long)screenpos(vc, offset, viewed);
557 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
558 /*
559 * Desired position falls in the main screen buffer.
560 * However the actual row/col might be different if
561 * scrollback is active.
562 */
563 row = (pos - vc->vc_origin) / vc->vc_size_row;
564 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
565 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
566 } else {
567 /*
568 * Scrollback is active. For now let's simply backtranslate
569 * the screen glyphs until the unicode screen buffer does
570 * synchronize with console display drivers for a scrollback
571 * buffer of its own.
572 */
573 u16 *p = (u16 *)pos;
574 int mask = vc->vc_hi_font_mask | 0xff;
575 char32_t *uni_buf = dest;
576 while (nr--) {
577 u16 glyph = scr_readw(p++) & mask;
578 *uni_buf++ = inverse_translate(vc, glyph, true);
579 }
580 }
d21b0be2
NP		 581}
582
0224080f
NP		 583/* this is for validation and debugging only */
584static void vc_uniscr_debug_check(struct vc_data *vc)
585{
586 struct uni_screen *uniscr = get_vc_uniscr(vc);
587 unsigned short *p;
588 int x, y, mask;
589
590 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
591 return;
592
593 WARN_CONSOLE_UNLOCKED();
594
595 /*
596 * Make sure our unicode screen translates into the same glyphs
597 * as the actual screen. This is brutal indeed.
598 */
599 p = (unsigned short *)vc->vc_origin;
600 mask = vc->vc_hi_font_mask | 0xff;
601 for (y = 0; y < vc->vc_rows; y++) {
602 char32_t *line = uniscr->lines[y];
603 for (x = 0; x < vc->vc_cols; x++) {
604 u16 glyph = scr_readw(p++) & mask;
605 char32_t uc = line[x];
606 int tc = conv_uni_to_pc(vc, uc);
607 if (tc == -4)
608 tc = conv_uni_to_pc(vc, 0xfffd);
609 if (tc == -4)
610 tc = conv_uni_to_pc(vc, '?');
611 if (tc != glyph)
612 pr_err_ratelimited(
613 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
614 __func__, x, y, glyph, tc);
615 }
616 }
617}
618
d8ae7242 619
89765b94
JS		 620static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
621 enum con_scroll dir, unsigned int nr)
1da177e4 622{
89765b94 623 u16 *clear, *d, *s;
1da177e4 624
89765b94 625 if (t + nr >= b)
1da177e4
LT		 626 nr = b - t - 1;
627 if (b > vc->vc_rows || t >= b || nr < 1)
628 return;
d8ae7242 629 vc_uniscr_scroll(vc, t, b, dir, nr);
89765b94 630 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
1da177e4 631 return;
1da177e4 632
89765b94
JS		 633 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
634 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
1da177e4 635
89765b94
JS		 636 if (dir == SM_UP) {
637 clear = s + (b - t - nr) * vc->vc_cols;
638 swap(s, d);
639 }
640 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
641 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
1da177e4
LT		 642}
643
644static void do_update_region(struct vc_data *vc, unsigned long start, int count)
645{
1da177e4
LT		 646 unsigned int xx, yy, offset;
647 u16 *p;
648
649 p = (u16 *) start;
650 if (!vc->vc_sw->con_getxy) {
651 offset = (start - vc->vc_origin) / 2;
652 xx = offset % vc->vc_cols;
653 yy = offset / vc->vc_cols;
654 } else {
655 int nxx, nyy;
656 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
657 xx = nxx; yy = nyy;
658 }
659 for(;;) {
660 u16 attrib = scr_readw(p) & 0xff00;
661 int startx = xx;
662 u16 *q = p;
663 while (xx < vc->vc_cols && count) {
664 if (attrib != (scr_readw(p) & 0xff00)) {
665 if (p > q)
666 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
667 startx = xx;
668 q = p;
669 attrib = scr_readw(p) & 0xff00;
670 }
671 p++;
672 xx++;
673 count--;
674 }
675 if (p > q)
676 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
677 if (!count)
678 break;
679 xx = 0;
680 yy++;
681 if (vc->vc_sw->con_getxy) {
682 p = (u16 *)start;
683 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
684 }
685 }
1da177e4
LT		 686}
687
688void update_region(struct vc_data *vc, unsigned long start, int count)
689{
690 WARN_CONSOLE_UNLOCKED();
691
6ca8dfd7 692 if (con_should_update(vc)) {
1da177e4
LT		 693 hide_cursor(vc);
694 do_update_region(vc, start, count);
695 set_cursor(vc);
696 }
697}
698
699/* Structure of attributes is hardware-dependent */
700
b84ae3dc 701static u8 build_attr(struct vc_data *vc, u8 _color,
77bc14f2
JS		 702 enum vc_intensity _intensity, bool _blink, bool _underline,
703 bool _reverse, bool _italic)
1da177e4
LT		 704{
705 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 706 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 _blink, _underline, _reverse, _italic);
1da177e4 708
1da177e4
LT		 709/*
710 * ++roman: I completely changed the attribute format for monochrome
711 * mode (!can_do_color). The formerly used MDA (monochrome display
712 * adapter) format didn't allow the combination of certain effects.
713 * Now the attribute is just a bit vector:
714 * Bit 0..1: intensity (0..2)
715 * Bit 2 : underline
716 * Bit 3 : reverse
717 * Bit 7 : blink
718 */
719 {
c9e587ab 720 u8 a = _color;
1da177e4
LT		 721 if (!vc->vc_can_do_color)
722 return _intensity |
c5c717e7
JS		 723 (_italic << 1) |
724 (_underline << 2) |
725 (_reverse << 3) |
726 (_blink << 7);
fa6ce9ab
JE		 727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
1da177e4 730 a = (a & 0xf0) | vc->vc_ulcolor;
b84ae3dc 731 else if (_intensity == VCI_HALF_BRIGHT)
1c65a879 732 a = (a & 0xf0) | vc->vc_halfcolor;
1da177e4 733 if (_reverse)
faace51b 734 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
1da177e4
LT		 735 if (_blink)
736 a ^= 0x80;
b84ae3dc 737 if (_intensity == VCI_BOLD)
1da177e4
LT		 738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
1da177e4
LT		 743}
744
745static void update_attr(struct vc_data *vc)
746{
28bc24fc
JS		 747 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
748 vc->state.blink, vc->state.underline,
749 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
b84ae3dc 750 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
77bc14f2
JS		 751 VCI_NORMAL, vc->state.blink, false,
752 vc->vc_decscnm, false) << 8);
1da177e4
LT		 753}
754
755/* Note: inverting the screen twice should revert to the original state */
b8209f69 756void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
1da177e4
LT		 757{
758 unsigned short *p;
759
760 WARN_CONSOLE_UNLOCKED();
761
762 count /= 2;
763 p = screenpos(vc, offset, viewed);
6af39ed3 764 if (vc->vc_sw->con_invert_region) {
1da177e4 765 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 766 } else {
1da177e4
LT		 767 u16 *q = p;
768 int cnt = count;
769 u16 a;
770
771 if (!vc->vc_can_do_color) {
772 while (cnt--) {
773 a = scr_readw(q);
774 a ^= 0x0800;
775 scr_writew(a, q);
776 q++;
777 }
778 } else if (vc->vc_hi_font_mask == 0x100) {
779 while (cnt--) {
780 a = scr_readw(q);
faace51b
JS		 781 a = (a & 0x11ff) |
782 ((a & 0xe000) >> 4) |
783 ((a & 0x0e00) << 4);
1da177e4
LT		 784 scr_writew(a, q);
785 q++;
786 }
787 } else {
788 while (cnt--) {
789 a = scr_readw(q);
faace51b
JS		 790 a = (a & 0x88ff) |
791 ((a & 0x7000) >> 4) |
792 ((a & 0x0700) << 4);
1da177e4
LT		 793 scr_writew(a, q);
794 q++;
795 }
796 }
797 }
6af39ed3 798
6ca8dfd7 799 if (con_should_update(vc))
1da177e4 800 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 801 notify_update(vc);
1da177e4
LT		 802}
803
804/* used by selection: complement pointer position */
805void complement_pos(struct vc_data *vc, int offset)
806{
414edcd3 807 static int old_offset = -1;
1da177e4
LT		 808 static unsigned short old;
809 static unsigned short oldx, oldy;
810
811 WARN_CONSOLE_UNLOCKED();
812
414edcd3
AD		 813 if (old_offset != -1 && old_offset >= 0 &&
814 old_offset < vc->vc_screenbuf_size) {
b8209f69 815 scr_writew(old, screenpos(vc, old_offset, true));
6ca8dfd7 816 if (con_should_update(vc))
1da177e4 817 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 818 notify_update(vc);
1da177e4 819 }
414edcd3
AD		 820
821 old_offset = offset;
822
823 if (offset != -1 && offset >= 0 &&
824 offset < vc->vc_screenbuf_size) {
1da177e4 825 unsigned short new;
414edcd3 826 unsigned short *p;
b8209f69 827 p = screenpos(vc, offset, true);
1da177e4
LT		 828 old = scr_readw(p);
829 new = old ^ vc->vc_complement_mask;
830 scr_writew(new, p);
6ca8dfd7 831 if (con_should_update(vc)) {
1da177e4
LT		 832 oldx = (offset >> 1) % vc->vc_cols;
833 oldy = (offset >> 1) / vc->vc_cols;
834 vc->vc_sw->con_putc(vc, new, oldy, oldx);
835 }
19e3ae6b 836 notify_update(vc);
1da177e4
LT		 837 }
838}
839
840static void insert_char(struct vc_data *vc, unsigned int nr)
841{
81732c3b 842 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 843
d8ae7242 844 vc_uniscr_insert(vc, nr);
28bc24fc 845 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
81732c3b 846 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 847 vc->vc_need_wrap = 0;
6ca8dfd7 848 if (con_should_update(vc))
81732c3b 849 do_update_region(vc, (unsigned long) p,
28bc24fc 850 vc->vc_cols - vc->state.x);
1da177e4
LT		 851}
852
853static void delete_char(struct vc_data *vc, unsigned int nr)
854{
81732c3b 855 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 856
d8ae7242 857 vc_uniscr_delete(vc, nr);
39cdb68c 858 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
28bc24fc 859 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
81732c3b 860 nr * 2);
1da177e4 861 vc->vc_need_wrap = 0;
6ca8dfd7 862 if (con_should_update(vc))
81732c3b 863 do_update_region(vc, (unsigned long) p,
28bc24fc 864 vc->vc_cols - vc->state.x);
1da177e4
LT		 865}
866
e882f715 867static int softcursor_original = -1;
1da177e4
LT		 868
869static void add_softcursor(struct vc_data *vc)
870{
871 int i = scr_readw((u16 *) vc->vc_pos);
872 u32 type = vc->vc_cursor_type;
873
c0e4b3ad 874 if (!(type & CUR_SW))
dc219db6
JS		 875 return;
876 if (softcursor_original != -1)
877 return;
1da177e4 878 softcursor_original = i;
c0e4b3ad
JS		 879 i |= CUR_SET(type);
880 i ^= CUR_CHANGE(type);
881 if ((type & CUR_ALWAYS_BG) &&
882 (softcursor_original & CUR_BG) == (i & CUR_BG))
883 i ^= CUR_BG;
884 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
885 i ^= CUR_FG;
dc219db6 886 scr_writew(i, (u16 *)vc->vc_pos);
6ca8dfd7 887 if (con_should_update(vc))
28bc24fc 888 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
1da177e4
LT		 889}
890
891static void hide_softcursor(struct vc_data *vc)
892{
893 if (softcursor_original != -1) {
894 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 895 if (con_should_update(vc))
1da177e4 896 vc->vc_sw->con_putc(vc, softcursor_original,
28bc24fc 897 vc->state.y, vc->state.x);
1da177e4
LT		 898 softcursor_original = -1;
899 }
900}
901
902static void hide_cursor(struct vc_data *vc)
903{
dce05aa6 904 if (vc_is_sel(vc))
1da177e4 905 clear_selection();
dce05aa6 906
1da177e4
LT		 907 vc->vc_sw->con_cursor(vc, CM_ERASE);
908 hide_softcursor(vc);
909}
910
911static void set_cursor(struct vc_data *vc)
912{
6ca8dfd7 913 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 914 return;
915 if (vc->vc_deccm) {
dce05aa6 916 if (vc_is_sel(vc))
1da177e4
LT		 917 clear_selection();
918 add_softcursor(vc);
c0e4b3ad 919 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
1da177e4
LT		 920 vc->vc_sw->con_cursor(vc, CM_DRAW);
921 } else
922 hide_cursor(vc);
923}
924
925static void set_origin(struct vc_data *vc)
926{
927 WARN_CONSOLE_UNLOCKED();
928
6ca8dfd7 929 if (!con_is_visible(vc) ||
1da177e4
LT		 930 !vc->vc_sw->con_set_origin ||
931 !vc->vc_sw->con_set_origin(vc))
932 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
933 vc->vc_visible_origin = vc->vc_origin;
934 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
28bc24fc
JS		 935 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
936 2 * vc->state.x;
1da177e4
LT		 937}
938
c0f160a7 939static void save_screen(struct vc_data *vc)
1da177e4
LT		 940{
941 WARN_CONSOLE_UNLOCKED();
942
943 if (vc->vc_sw->con_save_screen)
944 vc->vc_sw->con_save_screen(vc);
945}
946
bcd375f7
MS		 947static void flush_scrollback(struct vc_data *vc)
948{
949 WARN_CONSOLE_UNLOCKED();
950
a6dbe442 951 set_origin(vc);
3f4ef485 952 if (vc->vc_sw->con_flush_scrollback) {
bcd375f7 953 vc->vc_sw->con_flush_scrollback(vc);
3f4ef485
NP		 954 } else if (con_is_visible(vc)) {
955 /*
956 * When no con_flush_scrollback method is provided then the
957 * legacy way for flushing the scrollback buffer is to use
958 * a side effect of the con_switch method. We do it only on
959 * the foreground console as background consoles have no
960 * scrollback buffers in that case and we obviously don't
961 * want to switch to them.
962 */
963 hide_cursor(vc);
a6dbe442 964 vc->vc_sw->con_switch(vc);
3f4ef485
NP		 965 set_cursor(vc);
966 }
bcd375f7
MS		 967}
968
1da177e4
LT		 969/*
970 * Redrawing of screen
971 */
972
2a248307 973void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 974{
975 unsigned short *p = (unsigned short *)vc->vc_origin;
976 int count = vc->vc_screenbuf_size / 2;
977 int mask = vc->vc_hi_font_mask | 0xff;
978
979 for (; count > 0; count--, p++) {
980 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
981 }
982}
983
984void redraw_screen(struct vc_data *vc, int is_switch)
985{
986 int redraw = 0;
987
988 WARN_CONSOLE_UNLOCKED();
989
990 if (!vc) {
991 /* strange ... */
992 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
993 return;
994 }
995
996 if (is_switch) {
997 struct vc_data *old_vc = vc_cons[fg_console].d;
998 if (old_vc == vc)
999 return;
6ca8dfd7 1000 if (!con_is_visible(vc))
1da177e4
LT		 1001 redraw = 1;
1002 *vc->vc_display_fg = vc;
1003 fg_console = vc->vc_num;
1004 hide_cursor(old_vc);
6ca8dfd7 1005 if (!con_is_visible(old_vc)) {
1da177e4
LT		 1006 save_screen(old_vc);
1007 set_origin(old_vc);
1008 }
fbc92a34
KS		 1009 if (tty0dev)
1010 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 1011 } else {
1012 hide_cursor(vc);
1013 redraw = 1;
1014 }
1015
1016 if (redraw) {
1017 int update;
1018 int old_was_color = vc->vc_can_do_color;
1019
1020 set_origin(vc);
1021 update = vc->vc_sw->con_switch(vc);
1022 set_palette(vc);
1023 /*
1024 * If console changed from mono<->color, the best we can do
1025 * is to clear the buffer attributes. As it currently stands,
1026 * rebuilding new attributes from the old buffer is not doable
1027 * without overly complex code.
1028 */
1029 if (old_was_color != vc->vc_can_do_color) {
1030 update_attr(vc);
1031 clear_buffer_attributes(vc);
1032 }
8fd4bd22 1033
8d7fc299 1034 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 1035 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1036 }
1037 set_cursor(vc);
1038 if (is_switch) {
63f24a7f 1039 vt_set_leds_compute_shiftstate();
8182ec49 1040 notify_update(vc);
1da177e4
LT		 1041 }
1042}
1043
1044/*
1045 * Allocation, freeing and resizing of VTs.
1046 */
1047
1048int vc_cons_allocated(unsigned int i)
1049{
1050 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1051}
1052
1053static void visual_init(struct vc_data *vc, int num, int init)
1054{
1055 /* ++Geert: vc->vc_sw->con_init determines console size */
1056 if (vc->vc_sw)
1057 module_put(vc->vc_sw->owner);
1058 vc->vc_sw = conswitchp;
1059#ifndef VT_SINGLE_DRIVER
1060 if (con_driver_map[num])
1061 vc->vc_sw = con_driver_map[num];
1062#endif
1063 __module_get(vc->vc_sw->owner);
1064 vc->vc_num = num;
1065 vc->vc_display_fg = &master_display_fg;
8da443b1 1066 if (vc->uni_pagedict_loc)
08b33249 1067 con_free_unimap(vc);
8da443b1
JS		 1068 vc->uni_pagedict_loc = &vc->uni_pagedict;
1069 vc->uni_pagedict = NULL;
1da177e4
LT		 1070 vc->vc_hi_font_mask = 0;
1071 vc->vc_complement_mask = 0;
1072 vc->vc_can_do_color = 0;
1b45996d 1073 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1074 vc->vc_sw->con_init(vc, init);
1075 if (!vc->vc_complement_mask)
1076 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077 vc->vc_s_complement_mask = vc->vc_complement_mask;
1078 vc->vc_size_row = vc->vc_cols << 1;
1079 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1080}
1081
a1ad1cc9
GH		 1082
1083static void visual_deinit(struct vc_data *vc)
1084{
1085 vc->vc_sw->con_deinit(vc);
1086 module_put(vc->vc_sw->owner);
1087}
1088
ca4463bf
EB		 1089static void vc_port_destruct(struct tty_port *port)
1090{
1091 struct vc_data *vc = container_of(port, struct vc_data, port);
1092
1093 kfree(vc);
1094}
1095
1096static const struct tty_port_operations vc_port_ops = {
1097 .destruct = vc_port_destruct,
1098};
1099
ce684552
TH		 1100/*
1101 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1102 * [this is to be used together with some user program
1103 * like resize that changes the hardware videomode]
1104 */
1105#define VC_MAXCOL (32767)
1106#define VC_MAXROW (32767)
1107
1da177e4
LT		 1108int vc_allocate(unsigned int currcons) /* return 0 on success */
1109{
34902b7f
JS		 1110 struct vt_notifier_param param;
1111 struct vc_data *vc;
ce684552 1112 int err;
34902b7f 1113
1da177e4
LT		 1114 WARN_CONSOLE_UNLOCKED();
1115
1116 if (currcons >= MAX_NR_CONSOLES)
1117 return -ENXIO;
34902b7f
JS		 1118
1119 if (vc_cons[currcons].d)
1120 return 0;
1121
1122 /* due to the granularity of kmalloc, we waste some memory here */
1123 /* the alloc is done in two steps, to optimize the common situation
1124 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1125 /* although the numbers above are not valid since long ago, the
1126 point is still up-to-date and the comment still has its value
1127 even if only as a historical artifact. --mj, July 1998 */
1128 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1129 if (!vc)
1da177e4 1130 return -ENOMEM;
34902b7f
JS		 1131
1132 vc_cons[currcons].d = vc;
1133 tty_port_init(&vc->port);
ca4463bf 1134 vc->port.ops = &vc_port_ops;
34902b7f
JS		 1135 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1136
1137 visual_init(vc, currcons, 1);
1138
8da443b1 1139 if (!*vc->uni_pagedict_loc)
1da177e4 1140 con_set_default_unimap(vc);
f6c06b68 1141
ce684552
TH		 1142 err = -EINVAL;
1143 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1144 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1145 goto err_free;
1146 err = -ENOMEM;
21eff69a 1147 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1148 if (!vc->vc_screenbuf)
1149 goto err_free;
1150
1151 /* If no drivers have overridden us and the user didn't pass a
1152 boot option, default to displaying the cursor */
1153 if (global_cursor_default == -1)
1154 global_cursor_default = 1;
1155
1156 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1157 vcs_make_sysfs(currcons);
1158 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1159
1da177e4 1160 return 0;
34902b7f 1161err_free:
a1ad1cc9 1162 visual_deinit(vc);
34902b7f
JS		 1163 kfree(vc);
1164 vc_cons[currcons].d = NULL;
ce684552 1165 return err;
1da177e4
LT		 1166}
1167
e400b6ec
AD		 1168static inline int resize_screen(struct vc_data *vc, int width, int height,
1169 int user)
1da177e4
LT		 1170{
1171 /* Resizes the resolution of the display adapater */
1172 int err = 0;
1173
ffb324e6 1174 if (vc->vc_sw->con_resize)
e400b6ec
AD		 1175 err = vc->vc_sw->con_resize(vc, width, height, user);
1176
1da177e4
LT		 1177 return err;
1178}
1179
8c9a9dd0
AC		 1180/**
1181 * vc_do_resize - resizing method for the tty
1182 * @tty: tty being resized
8c9a9dd0
AC		 1183 * @vc: virtual console private data
1184 * @cols: columns
1185 * @lines: lines
1186 *
1187 * Resize a virtual console, clipping according to the actual constraints.
1188 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1189 * information and perform any necessary signal handling.
8c9a9dd0 1190 *
6a1c0680 1191 * Caller must hold the console semaphore. Takes the termios rwsem and
64d608db 1192 * ctrl.lock of the tty IFF a tty is passed.
8c9a9dd0
AC		 1193 */
1194
fc6f6238
AC		 1195static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1196 unsigned int cols, unsigned int lines)
1da177e4
LT		 1197{
1198 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1199 unsigned long end;
d8ae7242 1200 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1201 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1202 unsigned int user;
f8d1653d 1203 unsigned short *oldscreen, *newscreen;
d8ae7242 1204 struct uni_screen *new_uniscr = NULL;
1da177e4
LT		 1205
1206 WARN_CONSOLE_UNLOCKED();
1207
1208 if (!vc)
1209 return -ENXIO;
1210
e400b6ec
AD		 1211 user = vc->vc_resize_user;
1212 vc->vc_resize_user = 0;
1213
ce684552 1214 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1da177e4
LT		 1215 return -EINVAL;
1216
1217 new_cols = (cols ? cols : vc->vc_cols);
1218 new_rows = (lines ? lines : vc->vc_rows);
1219 new_row_size = new_cols << 1;
1220 new_screen_size = new_row_size * new_rows;
1221
3b0c4061
IMAT		 1222 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1223 /*
1224 * This function is being called here to cover the case
1225 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1226 * passing the same fb_var_screeninfo containing the fields
1227 * yres/xres equal to a number non-multiple of vc_font.height
1228 * and yres_virtual/xres_virtual equal to number lesser than the
1229 * vc_font.height and yres/xres.
1230 * In the second call, the struct fb_var_screeninfo isn't
1231 * being modified by the underlying driver because of the
1232 * if above, and this causes the fbcon_display->vrows to become
1233 * negative and it eventually leads to out-of-bound
1234 * access by the imageblit function.
1235 * To give the correct values to the struct and to not have
1236 * to deal with possible errors from the code below, we call
1237 * the resize_screen here as well.
1238 */
1239 return resize_screen(vc, new_cols, new_rows, user);
1240 }
1da177e4 1241
ce684552 1242 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
32b2921e 1243 return -EINVAL;
21eff69a 1244 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1245 if (!newscreen)
1246 return -ENOMEM;
1247
d8ae7242
NP		 1248 if (get_vc_uniscr(vc)) {
1249 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1250 if (!new_uniscr) {
1251 kfree(newscreen);
1252 return -ENOMEM;
1253 }
1254 }
1255
dce05aa6 1256 if (vc_is_sel(vc))
009e39ae
SD		 1257 clear_selection();
1258
1da177e4 1259 old_rows = vc->vc_rows;
1da177e4 1260 old_row_size = vc->vc_size_row;
1da177e4 1261
e400b6ec 1262 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1263 if (err) {
1264 kfree(newscreen);
57d38f26 1265 vc_uniscr_free(new_uniscr);
1da177e4
LT		 1266 return err;
1267 }
1268
1269 vc->vc_rows = new_rows;
1270 vc->vc_cols = new_cols;
1271 vc->vc_size_row = new_row_size;
1272 vc->vc_screenbuf_size = new_screen_size;
1273
1274 rlth = min(old_row_size, new_row_size);
1275 rrem = new_row_size - rlth;
1276 old_origin = vc->vc_origin;
1277 new_origin = (long) newscreen;
1278 new_scr_end = new_origin + new_screen_size;
3b41dc1a 1279
28bc24fc
JS		 1280 if (vc->state.y > new_rows) {
1281 if (old_rows - vc->state.y < new_rows) {
3b41dc1a
AD		 1282 /*
1283 * Cursor near the bottom, copy contents from the
1284 * bottom of buffer
1285 */
d8ae7242 1286 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1287 } else {
1288 /*
1289 * Cursor is in no man's land, copy 1/2 screenful
1290 * from the top and bottom of cursor position
1291 */
28bc24fc 1292 first_copied_row = (vc->state.y - new_rows/2);
3b41dc1a 1293 }
d8ae7242
NP		 1294 old_origin += first_copied_row * old_row_size;
1295 } else
1296 first_copied_row = 0;
9fc2b2d0 1297 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1298
d8ae7242
NP		 1299 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1300 get_vc_uniscr(vc), rlth/2, first_copied_row,
1301 min(old_rows, new_rows));
1302 vc_uniscr_set(vc, new_uniscr);
1303
1da177e4
LT		 1304 update_attr(vc);
1305
3b41dc1a
AD		 1306 while (old_origin < end) {
1307 scr_memcpyw((unsigned short *) new_origin,
1308 (unsigned short *) old_origin, rlth);
1da177e4 1309 if (rrem)
3b41dc1a
AD		 1310 scr_memsetw((void *)(new_origin + rlth),
1311 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1312 old_origin += old_row_size;
1313 new_origin += new_row_size;
1314 }
1315 if (new_scr_end > new_origin)
3b41dc1a
AD		 1316 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1317 new_scr_end - new_origin);
f8d1653d 1318 oldscreen = vc->vc_screenbuf;
1da177e4 1319 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1320 vc->vc_screenbuf_size = new_screen_size;
1321 set_origin(vc);
f8d1653d 1322 kfree(oldscreen);
1da177e4
LT		 1323
1324 /* do part of a reset_terminal() */
1325 vc->vc_top = 0;
1326 vc->vc_bottom = vc->vc_rows;
28bc24fc 1327 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 1328 save_cur(vc);
1329
8c9a9dd0
AC		 1330 if (tty) {
1331 /* Rewrite the requested winsize data with the actual
1332 resulting sizes */
1333 struct winsize ws;
1da177e4
LT		 1334 memset(&ws, 0, sizeof(ws));
1335 ws.ws_row = vc->vc_rows;
1336 ws.ws_col = vc->vc_cols;
1337 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1338 tty_do_resize(tty, &ws);
1da177e4
LT		 1339 }
1340
6ca8dfd7 1341 if (con_is_visible(vc))
1da177e4 1342 update_screen(vc);
8b92e87d 1343 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1344 notify_update(vc);
1da177e4
LT		 1345 return err;
1346}
1347
8c9a9dd0
AC		 1348/**
1349 * vc_resize - resize a VT
1350 * @vc: virtual console
1351 * @cols: columns
1352 * @rows: rows
1353 *
1354 * Resize a virtual console as seen from the console end of things. We
1355 * use the common vc_do_resize methods to update the structures. The
1356 * caller must hold the console sem to protect console internals and
8ce73264 1357 * vc->port.tty
8c9a9dd0
AC		 1358 */
1359
1360int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1361{
8ce73264 1362 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 1363}
1364
1365/**
1366 * vt_resize - resize a VT
1367 * @tty: tty to resize
8c9a9dd0
AC		 1368 * @ws: winsize attributes
1369 *
1370 * Resize a virtual terminal. This is called by the tty layer as we
1371 * register our own handler for resizing. The mutual helper does all
1372 * the actual work.
1373 *
1374 * Takes the console sem and the called methods then take the tty
64d608db 1375 * termios_rwsem and the tty ctrl.lock in that order.
8c9a9dd0 1376 */
da2bdf9a 1377static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1378{
8c9a9dd0
AC		 1379 struct vc_data *vc = tty->driver_data;
1380 int ret;
ca9bda00 1381
ac751efa 1382 console_lock();
fc6f6238 1383 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1384 console_unlock();
8c9a9dd0 1385 return ret;
ca9bda00 1386}
1da177e4 1387
421b40a6 1388struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1389{
421b40a6
PH		 1390 struct vc_data *vc = NULL;
1391
1da177e4
LT		 1392 WARN_CONSOLE_UNLOCKED();
1393
1394 if (vc_cons_allocated(currcons)) {
421b40a6 1395 struct vt_notifier_param param;
4995f8ef 1396
421b40a6 1397 param.vc = vc = vc_cons[currcons].d;
b293d758 1398 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1399 vcs_remove_sysfs(currcons);
a1ad1cc9 1400 visual_deinit(vc);
211b4d42 1401 con_free_unimap(vc);
bde0d2c9 1402 put_pid(vc->vt_pid);
d8ae7242 1403 vc_uniscr_set(vc, NULL);
5c9228f0 1404 kfree(vc->vc_screenbuf);
1da177e4
LT		 1405 vc_cons[currcons].d = NULL;
1406 }
421b40a6 1407 return vc;
1da177e4
LT		 1408}
1409
1410/*
1411 * VT102 emulator
1412 */
1413
2ff5c5a1
MH		 1414enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1415
079c9534
AC		 1416#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1417#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1418#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1419
1420#define decarm VC_REPEAT
1421#define decckm VC_CKMODE
1422#define kbdapplic VC_APPLIC
1423#define lnm VC_CRLF
1424
8ede5cce 1425const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1426 8,12,10,14, 9,13,11,15 };
1427
1428/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1429unsigned char default_red[] = {
1430 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1431 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1432};
1433module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1434
1435unsigned char default_grn[] = {
1436 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1437 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1438};
1439module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1440
1441unsigned char default_blu[] = {
1442 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1443 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1444};
1445module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1446
1da177e4
LT		 1447/*
1448 * gotoxy() must verify all boundaries, because the arguments
1449 * might also be negative. If the given position is out of
1450 * bounds, the cursor is placed at the nearest margin.
1451 */
1452static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1453{
1454 int min_y, max_y;
1455
1456 if (new_x < 0)
28bc24fc 1457 vc->state.x = 0;
1da177e4
LT		 1458 else {
1459 if (new_x >= vc->vc_cols)
28bc24fc 1460 vc->state.x = vc->vc_cols - 1;
1da177e4 1461 else
28bc24fc 1462 vc->state.x = new_x;
1da177e4
LT		 1463 }
1464
1465 if (vc->vc_decom) {
1466 min_y = vc->vc_top;
1467 max_y = vc->vc_bottom;
1468 } else {
1469 min_y = 0;
1470 max_y = vc->vc_rows;
1471 }
1472 if (new_y < min_y)
28bc24fc 1473 vc->state.y = min_y;
1da177e4 1474 else if (new_y >= max_y)
28bc24fc 1475 vc->state.y = max_y - 1;
1da177e4 1476 else
28bc24fc
JS		 1477 vc->state.y = new_y;
1478 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1479 (vc->state.x << 1);
1da177e4
LT		 1480 vc->vc_need_wrap = 0;
1481}
1482
1483/* for absolute user moves, when decom is set */
1484static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1485{
1486 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1487}
1488
1b0ec88a 1489void scrollback(struct vc_data *vc)
1da177e4 1490{
1b0ec88a 1491 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1492}
1493
1494void scrollfront(struct vc_data *vc, int lines)
1495{
1496 if (!lines)
1497 lines = vc->vc_rows / 2;
1498 scrolldelta(lines);
1499}
1500
1501static void lf(struct vc_data *vc)
1502{
1503 /* don't scroll if above bottom of scrolling region, or
1504 * if below scrolling region
1505 */
28bc24fc 1506 if (vc->state.y + 1 == vc->vc_bottom)
89765b94 1507 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
28bc24fc
JS		 1508 else if (vc->state.y < vc->vc_rows - 1) {
1509 vc->state.y++;
1da177e4
LT		 1510 vc->vc_pos += vc->vc_size_row;
1511 }
1512 vc->vc_need_wrap = 0;
b293d758 1513 notify_write(vc, '\n');
1da177e4
LT		 1514}
1515
1516static void ri(struct vc_data *vc)
1517{
1518 /* don't scroll if below top of scrolling region, or
1519 * if above scrolling region
1520 */
28bc24fc 1521 if (vc->state.y == vc->vc_top)
89765b94 1522 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
28bc24fc
JS		 1523 else if (vc->state.y > 0) {
1524 vc->state.y--;
1da177e4
LT		 1525 vc->vc_pos -= vc->vc_size_row;
1526 }
1527 vc->vc_need_wrap = 0;
1528}
1529
1530static inline void cr(struct vc_data *vc)
1531{
28bc24fc
JS		 1532 vc->vc_pos -= vc->state.x << 1;
1533 vc->vc_need_wrap = vc->state.x = 0;
b293d758 1534 notify_write(vc, '\r');
1da177e4
LT		 1535}
1536
1537static inline void bs(struct vc_data *vc)
1538{
28bc24fc 1539 if (vc->state.x) {
1da177e4 1540 vc->vc_pos -= 2;
28bc24fc 1541 vc->state.x--;
1da177e4 1542 vc->vc_need_wrap = 0;
b293d758 1543 notify_write(vc, '\b');
1da177e4
LT		 1544 }
1545}
1546
1547static inline void del(struct vc_data *vc)
1548{
1549 /* ignored */
1550}
1551
1552static void csi_J(struct vc_data *vc, int vpar)
1553{
1554 unsigned int count;
1555 unsigned short * start;
1556
1557 switch (vpar) {
1558 case 0: /* erase from cursor to end of display */
28bc24fc
JS		 1559 vc_uniscr_clear_line(vc, vc->state.x,
1560 vc->vc_cols - vc->state.x);
1561 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1562 vc->vc_rows - vc->state.y - 1);
1da177e4
LT		 1563 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1564 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1565 break;
1566 case 1: /* erase from start to cursor */
28bc24fc
JS		 1567 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1568 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1da177e4
LT		 1569 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1570 start = (unsigned short *)vc->vc_origin;
1da177e4 1571 break;
a6dbe442
NP		 1572 case 3: /* include scrollback */
1573 flush_scrollback(vc);
df561f66 1574 fallthrough;
1da177e4 1575 case 2: /* erase whole display */
d8ae7242 1576 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1577 count = vc->vc_cols * vc->vc_rows;
1578 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1579 break;
1580 default:
1581 return;
1582 }
1583 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
b2ecf006
MP		 1584 if (con_should_update(vc))
1585 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1586 vc->vc_need_wrap = 0;
1587}
1588
1589static void csi_K(struct vc_data *vc, int vpar)
1590{
1591 unsigned int count;
d8ae7242
NP		 1592 unsigned short *start = (unsigned short *)vc->vc_pos;
1593 int offset;
1da177e4
LT		 1594
1595 switch (vpar) {
1596 case 0: /* erase from cursor to end of line */
d8ae7242 1597 offset = 0;
28bc24fc 1598 count = vc->vc_cols - vc->state.x;
1da177e4
LT		 1599 break;
1600 case 1: /* erase from start of line to cursor */
28bc24fc
JS		 1601 offset = -vc->state.x;
1602 count = vc->state.x + 1;
1da177e4
LT		 1603 break;
1604 case 2: /* erase whole line */
28bc24fc 1605 offset = -vc->state.x;
1da177e4 1606 count = vc->vc_cols;
1da177e4
LT		 1607 break;
1608 default:
1609 return;
1610 }
28bc24fc 1611 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
d8ae7242 1612 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1613 vc->vc_need_wrap = 0;
6ca8dfd7 1614 if (con_should_update(vc))
943210ba 1615 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1616}
1617
e8548296
JS		 1618/* erase the following vpar positions */
1619static void csi_X(struct vc_data *vc, unsigned int vpar)
1da177e4 1620{ /* not vt100? */
e8548296 1621 unsigned int count;
1da177e4
LT		 1622
1623 if (!vpar)
1624 vpar++;
e8548296
JS		 1625
1626 count = min(vpar, vc->vc_cols - vc->state.x);
1da177e4 1627
28bc24fc 1628 vc_uniscr_clear_line(vc, vc->state.x, count);
1da177e4 1629 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1630 if (con_should_update(vc))
28bc24fc 1631 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1da177e4
LT		 1632 vc->vc_need_wrap = 0;
1633}
1634
1635static void default_attr(struct vc_data *vc)
1636{
b84ae3dc 1637 vc->state.intensity = VCI_NORMAL;
77bc14f2
JS		 1638 vc->state.italic = false;
1639 vc->state.underline = false;
1640 vc->state.reverse = false;
1641 vc->state.blink = false;
28bc24fc 1642 vc->state.color = vc->vc_def_color;
1da177e4
LT		 1643}
1644
cec5b2a9
AB		 1645struct rgb { u8 r; u8 g; u8 b; };
1646
0f91e142 1647static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1648{
cec5b2a9 1649 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1650 c->r = i&1 ? 0xaa : 0x00;
1651 c->g = i&2 ? 0xaa : 0x00;
1652 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1653 } else if (i < 16) {
0f91e142
JS		 1654 c->r = i&1 ? 0xff : 0x55;
1655 c->g = i&2 ? 0xff : 0x55;
1656 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1657 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1658 c->r = (i - 16) / 36 * 85 / 2;
1659 c->g = (i - 16) / 6 % 6 * 85 / 2;
1660 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1661 } else /* Grayscale ramp. */
0f91e142 1662 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1663}
1664
0f91e142 1665static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1666{
193df022
JS		 1667 u8 hue = 0, max = max3(c->r, c->g, c->b);
1668
1669 if (c->r > max / 2)
1670 hue |= 4;
1671 if (c->g > max / 2)
1672 hue |= 2;
1673 if (c->b > max / 2)
1674 hue |= 1;
1675
1676 if (hue == 7 && max <= 0x55) {
1677 hue = 0;
b84ae3dc 1678 vc->state.intensity = VCI_BOLD;
193df022 1679 } else if (max > 0xaa)
b84ae3dc 1680 vc->state.intensity = VCI_BOLD;
cec5b2a9 1681 else
b84ae3dc 1682 vc->state.intensity = VCI_NORMAL;
193df022 1683
28bc24fc 1684 vc->state.color = (vc->state.color & 0xf0) | hue;
cec5b2a9
AB		 1685}
1686
0f91e142 1687static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1688{
1689 /* For backgrounds, err on the dark side. */
28bc24fc 1690 vc->state.color = (vc->state.color & 0x0f)
0f91e142 1691 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1692}
1693
e05ab238
JS		 1694/*
1695 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1696 * and thus need to be detected and ignored by hand. That standard also
1697 * wants : rather than ; as separators but sequences containing : are currently
1698 * completely ignored by the parser.
e05ab238
JS		 1699 *
1700 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1701 * supporting them.
1702 */
1703static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1704 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1705{
0f91e142
JS		 1706 struct rgb c;
1707
e05ab238
JS		 1708 i++;
1709 if (i > vc->vc_npar)
1710 return i;
1711
0bf1f4a8 1712 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1713 /* 256 colours */
e05ab238 1714 i++;
0f91e142 1715 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1716 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1717 /* 24 bit */
0f91e142
JS		 1718 c.r = vc->vc_par[i + 1];
1719 c.g = vc->vc_par[i + 2];
1720 c.b = vc->vc_par[i + 3];
e05ab238 1721 i += 3;
0f91e142
JS		 1722 } else
1723 return i;
1724
1725 set_color(vc, &c);
e05ab238
JS		 1726
1727 return i;
1728}
1729
ac751efa 1730/* console_lock is held */
1da177e4
LT		 1731static void csi_m(struct vc_data *vc)
1732{
1733 int i;
1734
1735 for (i = 0; i <= vc->vc_npar; i++)
1736 switch (vc->vc_par[i]) {
aada0a34
JS		 1737 case 0: /* all attributes off */
1738 default_attr(vc);
1739 break;
1740 case 1:
b84ae3dc 1741 vc->state.intensity = VCI_BOLD;
aada0a34
JS		 1742 break;
1743 case 2:
b84ae3dc 1744 vc->state.intensity = VCI_HALF_BRIGHT;
aada0a34
JS		 1745 break;
1746 case 3:
77bc14f2 1747 vc->state.italic = true;
aada0a34 1748 break;
65d9982d
MF		 1749 case 21:
1750 /*
1751 * No console drivers support double underline, so
1752 * convert it to a single underline.
1753 */
aada0a34 1754 case 4:
77bc14f2 1755 vc->state.underline = true;
aada0a34
JS		 1756 break;
1757 case 5:
77bc14f2 1758 vc->state.blink = true;
aada0a34
JS		 1759 break;
1760 case 7:
77bc14f2 1761 vc->state.reverse = true;
aada0a34
JS		 1762 break;
1763 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1764 * Select primary font, don't display control chars if
1765 * defined, don't set bit 8 on output.
1766 */
b70ec4d9 1767 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
aada0a34
JS		 1768 vc->vc_disp_ctrl = 0;
1769 vc->vc_toggle_meta = 0;
1770 break;
1771 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1772 * Select first alternate font, lets chars < 32 be
1773 * displayed as ROM chars.
1774 */
1775 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1776 vc->vc_disp_ctrl = 1;
1777 vc->vc_toggle_meta = 0;
1778 break;
1779 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1780 * Select second alternate font, toggle high bit
1781 * before displaying as ROM char.
1782 */
1783 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1784 vc->vc_disp_ctrl = 1;
1785 vc->vc_toggle_meta = 1;
1786 break;
aada0a34 1787 case 22:
b84ae3dc 1788 vc->state.intensity = VCI_NORMAL;
aada0a34
JS		 1789 break;
1790 case 23:
77bc14f2 1791 vc->state.italic = false;
aada0a34
JS		 1792 break;
1793 case 24:
77bc14f2 1794 vc->state.underline = false;
aada0a34
JS		 1795 break;
1796 case 25:
77bc14f2 1797 vc->state.blink = false;
aada0a34
JS		 1798 break;
1799 case 27:
77bc14f2 1800 vc->state.reverse = false;
aada0a34
JS		 1801 break;
1802 case 38:
1803 i = vc_t416_color(vc, i, rgb_foreground);
1804 break;
1805 case 48:
1806 i = vc_t416_color(vc, i, rgb_background);
1807 break;
1808 case 39:
28bc24fc
JS		 1809 vc->state.color = (vc->vc_def_color & 0x0f) |
1810 (vc->state.color & 0xf0);
aada0a34
JS		 1811 break;
1812 case 49:
28bc24fc
JS		 1813 vc->state.color = (vc->vc_def_color & 0xf0) |
1814 (vc->state.color & 0x0f);
aada0a34
JS		 1815 break;
1816 default:
fadb4244
AB		 1817 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1818 if (vc->vc_par[i] < 100)
b84ae3dc 1819 vc->state.intensity = VCI_BOLD;
cc67dc28
AB		 1820 vc->vc_par[i] -= 60;
1821 }
aada0a34 1822 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
28bc24fc
JS		 1823 vc->state.color = color_table[vc->vc_par[i] - 30]
1824 | (vc->state.color & 0xf0);
aada0a34 1825 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
28bc24fc
JS		 1826 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1827 | (vc->state.color & 0x0f);
aada0a34 1828 break;
1da177e4
LT		 1829 }
1830 update_attr(vc);
1831}
1832
de53ce04 1833static void respond_string(const char *p, size_t len, struct tty_port *port)
1da177e4 1834{
de53ce04 1835 tty_insert_flip_string(port, p, len);
5f6a8515 1836 tty_flip_buffer_push(port);
1da177e4
LT		 1837}
1838
1839static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1840{
1841 char buf[40];
de53ce04 1842 int len;
1da177e4 1843
de53ce04
JS		 1844 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1845 (vc->vc_decom ? vc->vc_top + 1 : 1),
1846 vc->state.x + 1);
1847 respond_string(buf, len, tty->port);
1da177e4
LT		 1848}
1849
1850static inline void status_report(struct tty_struct *tty)
1851{
de53ce04
JS		 1852 static const char teminal_ok[] = "\033[0n";
1853
1854 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1da177e4
LT		 1855}
1856
6732c8bb 1857static inline void respond_ID(struct tty_struct *tty)
1da177e4 1858{
9a6f72d9
JS		 1859 /* terminal answer to an ESC-Z or csi0c query. */
1860 static const char vt102_id[] = "\033[?6c";
1861
1862 respond_string(vt102_id, strlen(vt102_id), tty->port);
1da177e4
LT		 1863}
1864
1865void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1866{
1867 char buf[8];
de53ce04 1868 int len;
1da177e4 1869
de53ce04
JS		 1870 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1871 (char)('!' + mrx), (char)('!' + mry));
1872 respond_string(buf, len, tty->port);
1da177e4
LT		 1873}
1874
496124e5 1875/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1da177e4
LT		 1876int mouse_reporting(void)
1877{
1878 return vc_cons[fg_console].d->vc_report_mouse;
1879}
1880
ac751efa 1881/* console_lock is held */
1da177e4
LT		 1882static void set_mode(struct vc_data *vc, int on_off)
1883{
1884 int i;
1885
1886 for (i = 0; i <= vc->vc_npar; i++)
2ff5c5a1 1887 if (vc->vc_priv == EPdec) {
1da177e4
LT		 1888 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1889 case 1: /* Cursor keys send ^[Ox/^[[x */
1890 if (on_off)
1891 set_kbd(vc, decckm);
1892 else
1893 clr_kbd(vc, decckm);
1894 break;
1895 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1896#if 0
1897 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1898 /* this alone does not suffice; some user mode
1899 utility has to change the hardware regs */
1900#endif
1901 break;
1902 case 5: /* Inverted screen on/off */
1903 if (vc->vc_decscnm != on_off) {
1904 vc->vc_decscnm = on_off;
b8209f69
JS		 1905 invert_screen(vc, 0,
1906 vc->vc_screenbuf_size,
1907 false);
1da177e4
LT		 1908 update_attr(vc);
1909 }
1910 break;
1911 case 6: /* Origin relative/absolute */
1912 vc->vc_decom = on_off;
1913 gotoxay(vc, 0, 0);
1914 break;
1915 case 7: /* Autowrap on/off */
1916 vc->vc_decawm = on_off;
1917 break;
1918 case 8: /* Autorepeat on/off */
1919 if (on_off)
1920 set_kbd(vc, decarm);
1921 else
1922 clr_kbd(vc, decarm);
1923 break;
1924 case 9:
1925 vc->vc_report_mouse = on_off ? 1 : 0;
1926 break;
1927 case 25: /* Cursor on/off */
1928 vc->vc_deccm = on_off;
1929 break;
1930 case 1000:
1931 vc->vc_report_mouse = on_off ? 2 : 0;
1932 break;
1933 }
1934 } else {
1935 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1936 case 3: /* Monitor (display ctrls) */
1937 vc->vc_disp_ctrl = on_off;
1938 break;
1939 case 4: /* Insert Mode on/off */
1940 vc->vc_decim = on_off;
1941 break;
1942 case 20: /* Lf, Enter == CrLf/Lf */
1943 if (on_off)
1944 set_kbd(vc, lnm);
1945 else
1946 clr_kbd(vc, lnm);
1947 break;
1948 }
1949 }
1950}
1951
ac751efa 1952/* console_lock is held */
1da177e4
LT		 1953static void setterm_command(struct vc_data *vc)
1954{
c3a834e8
JS		 1955 switch (vc->vc_par[0]) {
1956 case 1: /* set color for underline mode */
1957 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1958 vc->vc_ulcolor = color_table[vc->vc_par[1]];
28bc24fc 1959 if (vc->state.underline)
c3a834e8
JS		 1960 update_attr(vc);
1961 }
1962 break;
1963 case 2: /* set color for half intensity mode */
1964 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1965 vc->vc_halfcolor = color_table[vc->vc_par[1]];
b84ae3dc 1966 if (vc->state.intensity == VCI_HALF_BRIGHT)
c3a834e8
JS		 1967 update_attr(vc);
1968 }
1969 break;
1970 case 8: /* store colors as defaults */
1971 vc->vc_def_color = vc->vc_attr;
1972 if (vc->vc_hi_font_mask == 0x100)
1973 vc->vc_def_color >>= 1;
1974 default_attr(vc);
1975 update_attr(vc);
1976 break;
1977 case 9: /* set blanking interval */
1978 blankinterval = min(vc->vc_par[1], 60U) * 60;
1979 poke_blanked_console();
1980 break;
1981 case 10: /* set bell frequency in Hz */
1982 if (vc->vc_npar >= 1)
1983 vc->vc_bell_pitch = vc->vc_par[1];
1984 else
1985 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1986 break;
1987 case 11: /* set bell duration in msec */
1988 if (vc->vc_npar >= 1)
1989 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1990 msecs_to_jiffies(vc->vc_par[1]) : 0;
1991 else
1992 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1993 break;
1994 case 12: /* bring specified console to the front */
1995 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1996 set_console(vc->vc_par[1] - 1);
1997 break;
1998 case 13: /* unblank the screen */
1999 poke_blanked_console();
2000 break;
2001 case 14: /* set vesa powerdown interval */
2002 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2003 break;
2004 case 15: /* activate the previous console */
2005 set_console(last_console);
2006 break;
2007 case 16: /* set cursor blink duration in msec */
2008 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2009 vc->vc_par[1] <= USHRT_MAX)
2010 vc->vc_cur_blink_ms = vc->vc_par[1];
2011 else
2012 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2013 break;
1da177e4
LT		 2014 }
2015}
2016
ac751efa 2017/* console_lock is held */
1da177e4
LT		 2018static void csi_at(struct vc_data *vc, unsigned int nr)
2019{
28bc24fc
JS		 2020 if (nr > vc->vc_cols - vc->state.x)
2021 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 2022 else if (!nr)
2023 nr = 1;
2024 insert_char(vc, nr);
2025}
2026
ac751efa 2027/* console_lock is held */
1da177e4
LT		 2028static void csi_L(struct vc_data *vc, unsigned int nr)
2029{
28bc24fc
JS		 2030 if (nr > vc->vc_rows - vc->state.y)
2031 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 2032 else if (!nr)
2033 nr = 1;
28bc24fc 2034 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 2035 vc->vc_need_wrap = 0;
2036}
2037
ac751efa 2038/* console_lock is held */
1da177e4
LT		 2039static void csi_P(struct vc_data *vc, unsigned int nr)
2040{
28bc24fc
JS		 2041 if (nr > vc->vc_cols - vc->state.x)
2042 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 2043 else if (!nr)
2044 nr = 1;
2045 delete_char(vc, nr);
2046}
2047
ac751efa 2048/* console_lock is held */
1da177e4
LT		 2049static void csi_M(struct vc_data *vc, unsigned int nr)
2050{
28bc24fc
JS		 2051 if (nr > vc->vc_rows - vc->state.y)
2052 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 2053 else if (!nr)
2054 nr=1;
28bc24fc 2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 2056 vc->vc_need_wrap = 0;
2057}
2058
ac751efa 2059/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 2060static void save_cur(struct vc_data *vc)
2061{
28bc24fc 2062 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
1da177e4
LT		 2063}
2064
ac751efa 2065/* console_lock is held */
1da177e4
LT		 2066static void restore_cur(struct vc_data *vc)
2067{
28bc24fc
JS		 2068 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2069
2070 gotoxy(vc, vc->state.x, vc->state.y);
b70ec4d9
JS		 2071 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2072 vc);
1da177e4
LT		 2073 update_attr(vc);
2074 vc->vc_need_wrap = 0;
2075}
2076
b290af68 2077enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
7a99565f 2078 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
3a2b2eb5 2079 ESpalette, ESosc, ESapc, ESpm, ESdcs };
1da177e4 2080
ac751efa 2081/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2082static void reset_terminal(struct vc_data *vc, int do_clear)
2083{
dbee4cff
JS		 2084 unsigned int i;
2085
1da177e4
LT		 2086 vc->vc_top = 0;
2087 vc->vc_bottom = vc->vc_rows;
2088 vc->vc_state = ESnormal;
2ff5c5a1 2089 vc->vc_priv = EPecma;
1da177e4 2090 vc->vc_translate = set_translate(LAT1_MAP, vc);
b70ec4d9
JS		 2091 vc->state.Gx_charset[0] = LAT1_MAP;
2092 vc->state.Gx_charset[1] = GRAF_MAP;
28bc24fc 2093 vc->state.charset = 0;
1da177e4
LT		 2094 vc->vc_need_wrap = 0;
2095 vc->vc_report_mouse = 0;
042f10ec 2096 vc->vc_utf = default_utf8;
1da177e4
LT		 2097 vc->vc_utf_count = 0;
2098
2099 vc->vc_disp_ctrl = 0;
2100 vc->vc_toggle_meta = 0;
2101
2102 vc->vc_decscnm = 0;
2103 vc->vc_decom = 0;
2104 vc->vc_decawm = 1;
f6c06b68 2105 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2106 vc->vc_decim = 0;
2107
079c9534 2108 vt_reset_keyboard(vc->vc_num);
1da177e4 2109
9ea9a886 2110 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2111 vc->vc_complement_mask = vc->vc_s_complement_mask;
2112
2113 default_attr(vc);
2114 update_attr(vc);
2115
dbee4cff
JS		 2116 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2117 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2118 set_bit(i, vc->vc_tab_stop);
1da177e4
LT		 2119
2120 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2121 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2122 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2123
2124 gotoxy(vc, 0, 0);
2125 save_cur(vc);
2126 if (do_clear)
2127 csi_J(vc, 2);
2128}
2129
b4d92b65
JS		 2130static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2131{
b70ec4d9 2132 unsigned char *charset = &vc->state.Gx_charset[which];
b4d92b65
JS		 2133
2134 switch (c) {
2135 case '0':
2136 *charset = GRAF_MAP;
2137 break;
2138 case 'B':
2139 *charset = LAT1_MAP;
2140 break;
2141 case 'U':
2142 *charset = IBMPC_MAP;
2143 break;
2144 case 'K':
2145 *charset = USER_MAP;
2146 break;
2147 }
2148
2149 if (vc->state.charset == which)
2150 vc->vc_translate = set_translate(*charset, vc);
2151}
2152
3a2b2eb5 2153/* is this state an ANSI control string? */
2154static bool ansi_control_string(unsigned int state)
2155{
2156 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2157 return true;
2158 return false;
2159}
2160
ac751efa 2161/* console_lock is held */
1da177e4
LT		 2162static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2163{
2164 /*
2165 * Control characters can be used in the _middle_
3a2b2eb5 2166 * of an escape sequence, aside from ANSI control strings.
1da177e4 2167 */
3a2b2eb5 2168 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
63f3a16d 2169 return;
1da177e4
LT		 2170 switch (c) {
2171 case 0:
2172 return;
2173 case 7:
3a2b2eb5 2174 if (ansi_control_string(vc->vc_state))
63f3a16d
AB		 2175 vc->vc_state = ESnormal;
2176 else if (vc->vc_bell_duration)
1da177e4
LT		 2177 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2178 return;
2179 case 8:
2180 bs(vc);
2181 return;
2182 case 9:
28bc24fc 2183 vc->vc_pos -= (vc->state.x << 1);
dbee4cff
JS		 2184
2185 vc->state.x = find_next_bit(vc->vc_tab_stop,
2186 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2187 vc->state.x + 1);
2188 if (vc->state.x >= VC_TABSTOPS_COUNT)
2189 vc->state.x = vc->vc_cols - 1;
2190
28bc24fc 2191 vc->vc_pos += (vc->state.x << 1);
b293d758 2192 notify_write(vc, '\t');
1da177e4
LT		 2193 return;
2194 case 10: case 11: case 12:
2195 lf(vc);
2196 if (!is_kbd(vc, lnm))
2197 return;
df561f66 2198 fallthrough;
1da177e4
LT		 2199 case 13:
2200 cr(vc);
2201 return;
2202 case 14:
28bc24fc 2203 vc->state.charset = 1;
b70ec4d9 2204 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
1da177e4
LT		 2205 vc->vc_disp_ctrl = 1;
2206 return;
2207 case 15:
28bc24fc 2208 vc->state.charset = 0;
b70ec4d9 2209 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
1da177e4
LT		 2210 vc->vc_disp_ctrl = 0;
2211 return;
2212 case 24: case 26:
2213 vc->vc_state = ESnormal;
2214 return;
2215 case 27:
2216 vc->vc_state = ESesc;
2217 return;
2218 case 127:
2219 del(vc);
2220 return;
2221 case 128+27:
2222 vc->vc_state = ESsquare;
2223 return;
2224 }
2225 switch(vc->vc_state) {
2226 case ESesc:
2227 vc->vc_state = ESnormal;
2228 switch (c) {
2229 case '[':
2230 vc->vc_state = ESsquare;
2231 return;
2232 case ']':
2233 vc->vc_state = ESnonstd;
2234 return;
3a2b2eb5 2235 case '_':
2236 vc->vc_state = ESapc;
2237 return;
2238 case '^':
2239 vc->vc_state = ESpm;
2240 return;
1da177e4
LT		 2241 case '%':
2242 vc->vc_state = ESpercent;
2243 return;
2244 case 'E':
2245 cr(vc);
2246 lf(vc);
2247 return;
2248 case 'M':
2249 ri(vc);
2250 return;
2251 case 'D':
2252 lf(vc);
2253 return;
2254 case 'H':
dbee4cff
JS		 2255 if (vc->state.x < VC_TABSTOPS_COUNT)
2256 set_bit(vc->state.x, vc->vc_tab_stop);
1da177e4 2257 return;
3a2b2eb5 2258 case 'P':
2259 vc->vc_state = ESdcs;
2260 return;
1da177e4
LT		 2261 case 'Z':
2262 respond_ID(tty);
2263 return;
2264 case '7':
2265 save_cur(vc);
2266 return;
2267 case '8':
2268 restore_cur(vc);
2269 return;
2270 case '(':
2271 vc->vc_state = ESsetG0;
2272 return;
2273 case ')':
2274 vc->vc_state = ESsetG1;
2275 return;
2276 case '#':
2277 vc->vc_state = EShash;
2278 return;
2279 case 'c':
2280 reset_terminal(vc, 1);
2281 return;
2282 case '>': /* Numeric keypad */
2283 clr_kbd(vc, kbdapplic);
2284 return;
2285 case '=': /* Appl. keypad */
2286 set_kbd(vc, kbdapplic);
2287 return;
2288 }
2289 return;
2290 case ESnonstd:
2291 if (c=='P') { /* palette escape sequence */
2292 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2293 vc->vc_par[vc->vc_npar] = 0;
2294 vc->vc_npar = 0;
2295 vc->vc_state = ESpalette;
2296 return;
2297 } else if (c=='R') { /* reset palette */
2298 reset_palette(vc);
2299 vc->vc_state = ESnormal;
63f3a16d
AB		 2300 } else if (c>='0' && c<='9')
2301 vc->vc_state = ESosc;
2302 else
1da177e4
LT		 2303 vc->vc_state = ESnormal;
2304 return;
2305 case ESpalette:
74c807ce
AS		 2306 if (isxdigit(c)) {
2307 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2308 if (vc->vc_npar == 7) {
2309 int i = vc->vc_par[0] * 3, j = 1;
2310 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2311 vc->vc_palette[i++] += vc->vc_par[j++];
2312 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2313 vc->vc_palette[i++] += vc->vc_par[j++];
2314 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2315 vc->vc_palette[i] += vc->vc_par[j];
2316 set_palette(vc);
2317 vc->vc_state = ESnormal;
2318 }
2319 } else
2320 vc->vc_state = ESnormal;
2321 return;
2322 case ESsquare:
2323 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2324 vc->vc_par[vc->vc_npar] = 0;
2325 vc->vc_npar = 0;
2326 vc->vc_state = ESgetpars;
2327 if (c == '[') { /* Function key */
2328 vc->vc_state=ESfunckey;
2329 return;
2330 }
5445447b
MH		 2331 switch (c) {
2332 case '?':
2333 vc->vc_priv = EPdec;
2334 return;
2335 case '>':
2336 vc->vc_priv = EPgt;
2337 return;
2338 case '=':
2339 vc->vc_priv = EPeq;
1da177e4 2340 return;
5445447b
MH		 2341 case '<':
2342 vc->vc_priv = EPlt;
2343 return;
2344 }
2345 vc->vc_priv = EPecma;
df561f66 2346 fallthrough;
1da177e4
LT		 2347 case ESgetpars:
2348 if (c == ';' && vc->vc_npar < NPAR - 1) {
2349 vc->vc_npar++;
2350 return;
2351 } else if (c>='0' && c<='9') {
2352 vc->vc_par[vc->vc_npar] *= 10;
2353 vc->vc_par[vc->vc_npar] += c - '0';
2354 return;
b290af68 2355 }
04afcd3a 2356 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
7a99565f
MH		 2357 vc->vc_state = EScsiignore;
2358 return;
2359 }
1da177e4
LT		 2360 vc->vc_state = ESnormal;
2361 switch(c) {
2362 case 'h':
5445447b
MH		 2363 if (vc->vc_priv <= EPdec)
2364 set_mode(vc, 1);
1da177e4
LT		 2365 return;
2366 case 'l':
5445447b
MH		 2367 if (vc->vc_priv <= EPdec)
2368 set_mode(vc, 0);
1da177e4
LT		 2369 return;
2370 case 'c':
2ff5c5a1 2371 if (vc->vc_priv == EPdec) {
1da177e4 2372 if (vc->vc_par[0])
c0e4b3ad
JS		 2373 vc->vc_cursor_type =
2374 CUR_MAKE(vc->vc_par[0],
2375 vc->vc_par[1],
2376 vc->vc_par[2]);
1da177e4 2377 else
9ea9a886 2378 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2379 return;
2380 }
2381 break;
2382 case 'm':
2ff5c5a1 2383 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2384 clear_selection();
2385 if (vc->vc_par[0])
2386 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2387 else
2388 vc->vc_complement_mask = vc->vc_s_complement_mask;
2389 return;
2390 }
2391 break;
2392 case 'n':
2ff5c5a1 2393 if (vc->vc_priv == EPecma) {
1da177e4
LT		 2394 if (vc->vc_par[0] == 5)
2395 status_report(tty);
2396 else if (vc->vc_par[0] == 6)
2397 cursor_report(vc, tty);
2398 }
2399 return;
2400 }
2ff5c5a1
MH		 2401 if (vc->vc_priv != EPecma) {
2402 vc->vc_priv = EPecma;
1da177e4
LT		 2403 return;
2404 }
2405 switch(c) {
2406 case 'G': case '`':
2407 if (vc->vc_par[0])
2408 vc->vc_par[0]--;
28bc24fc 2409 gotoxy(vc, vc->vc_par[0], vc->state.y);
1da177e4
LT		 2410 return;
2411 case 'A':
2412 if (!vc->vc_par[0])
2413 vc->vc_par[0]++;
28bc24fc 2414 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2415 return;
2416 case 'B': case 'e':
2417 if (!vc->vc_par[0])
2418 vc->vc_par[0]++;
28bc24fc 2419 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2420 return;
2421 case 'C': case 'a':
2422 if (!vc->vc_par[0])
2423 vc->vc_par[0]++;
28bc24fc 2424 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
1da177e4
LT		 2425 return;
2426 case 'D':
2427 if (!vc->vc_par[0])
2428 vc->vc_par[0]++;
28bc24fc 2429 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
1da177e4
LT		 2430 return;
2431 case 'E':
2432 if (!vc->vc_par[0])
2433 vc->vc_par[0]++;
28bc24fc 2434 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2435 return;
2436 case 'F':
2437 if (!vc->vc_par[0])
2438 vc->vc_par[0]++;
28bc24fc 2439 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2440 return;
2441 case 'd':
2442 if (vc->vc_par[0])
2443 vc->vc_par[0]--;
28bc24fc 2444 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
1da177e4
LT		 2445 return;
2446 case 'H': case 'f':
2447 if (vc->vc_par[0])
2448 vc->vc_par[0]--;
2449 if (vc->vc_par[1])
2450 vc->vc_par[1]--;
2451 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2452 return;
2453 case 'J':
2454 csi_J(vc, vc->vc_par[0]);
2455 return;
2456 case 'K':
2457 csi_K(vc, vc->vc_par[0]);
2458 return;
2459 case 'L':
2460 csi_L(vc, vc->vc_par[0]);
2461 return;
2462 case 'M':
2463 csi_M(vc, vc->vc_par[0]);
2464 return;
2465 case 'P':
2466 csi_P(vc, vc->vc_par[0]);
2467 return;
2468 case 'c':
2469 if (!vc->vc_par[0])
2470 respond_ID(tty);
2471 return;
2472 case 'g':
dbee4cff
JS		 2473 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2474 set_bit(vc->state.x, vc->vc_tab_stop);
2475 else if (vc->vc_par[0] == 3)
2476 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
1da177e4
LT		 2477 return;
2478 case 'm':
2479 csi_m(vc);
2480 return;
2481 case 'q': /* DECLL - but only 3 leds */
2482 /* map 0,1,2,3 to 0,1,2,4 */
2483 if (vc->vc_par[0] < 4)
079c9534 2484 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2485 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2486 return;
2487 case 'r':
2488 if (!vc->vc_par[0])
2489 vc->vc_par[0]++;
2490 if (!vc->vc_par[1])
2491 vc->vc_par[1] = vc->vc_rows;
2492 /* Minimum allowed region is 2 lines */
2493 if (vc->vc_par[0] < vc->vc_par[1] &&
2494 vc->vc_par[1] <= vc->vc_rows) {
2495 vc->vc_top = vc->vc_par[0] - 1;
2496 vc->vc_bottom = vc->vc_par[1];
2497 gotoxay(vc, 0, 0);
2498 }
2499 return;
2500 case 's':
2501 save_cur(vc);
2502 return;
2503 case 'u':
2504 restore_cur(vc);
2505 return;
2506 case 'X':
2507 csi_X(vc, vc->vc_par[0]);
2508 return;
2509 case '@':
2510 csi_at(vc, vc->vc_par[0]);
2511 return;
2512 case ']': /* setterm functions */
2513 setterm_command(vc);
2514 return;
2515 }
2516 return;
7a99565f
MH		 2517 case EScsiignore:
2518 if (c >= 20 && c <= 0x3f)
2519 return;
2520 vc->vc_state = ESnormal;
2521 return;
1da177e4
LT		 2522 case ESpercent:
2523 vc->vc_state = ESnormal;
2524 switch (c) {
2525 case '@': /* defined in ISO 2022 */
2526 vc->vc_utf = 0;
2527 return;
2528 case 'G': /* prelim official escape code */
2529 case '8': /* retained for compatibility */
2530 vc->vc_utf = 1;
2531 return;
2532 }
2533 return;
2534 case ESfunckey:
2535 vc->vc_state = ESnormal;
2536 return;
2537 case EShash:
2538 vc->vc_state = ESnormal;
2539 if (c == '8') {
2540 /* DEC screen alignment test. kludge :-) */
2541 vc->vc_video_erase_char =
2542 (vc->vc_video_erase_char & 0xff00) | 'E';
2543 csi_J(vc, 2);
2544 vc->vc_video_erase_char =
2545 (vc->vc_video_erase_char & 0xff00) | ' ';
2546 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2547 }
2548 return;
2549 case ESsetG0:
b4d92b65 2550 vc_setGx(vc, 0, c);
1da177e4
LT		 2551 vc->vc_state = ESnormal;
2552 return;
2553 case ESsetG1:
b4d92b65 2554 vc_setGx(vc, 1, c);
1da177e4
LT		 2555 vc->vc_state = ESnormal;
2556 return;
3a2b2eb5 2557 case ESapc:
2558 return;
63f3a16d
AB		 2559 case ESosc:
2560 return;
3a2b2eb5 2561 case ESpm:
2562 return;
2563 case ESdcs:
2564 return;
1da177e4
LT		 2565 default:
2566 vc->vc_state = ESnormal;
2567 }
2568}
2569
2f1a2ccb 2570/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2571 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
a6fdf0c7 2572 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2f1a2ccb
EK		 2573 */
2574struct interval {
2575 uint32_t first;
2576 uint32_t last;
2577};
2578
f0a8d84f 2579static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2580{
f0a8d84f
TM		 2581 uint32_t ucs = *(uint32_t *)key;
2582 struct interval e = *(struct interval *) elt;
2f1a2ccb 2583
f0a8d84f
TM		 2584 if (ucs > e.last)
2585 return 1;
2586 else if (ucs < e.first)
2587 return -1;
2f1a2ccb
EK		 2588 return 0;
2589}
2590
2591static int is_double_width(uint32_t ucs)
2592{
2593 static const struct interval double_width[] = {
2594 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2595 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2596 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2597 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2598 };
f0a8d84f
TM		 2599 if (ucs < double_width[0].first ||
2600 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2601 return 0;
2602
2603 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2604 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2605}
2606
917ae1a9
JS		 2607struct vc_draw_region {
2608 unsigned long from, to;
2609 int x;
2610};
2611
2612static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
d711ea8f 2613{
917ae1a9 2614 if (draw->x < 0)
d711ea8f
JS		 2615 return;
2616
917ae1a9
JS		 2617 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2618 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2619 draw->x);
2620 draw->x = -1;
d711ea8f
JS		 2621}
2622
a018180c
JS		 2623static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2624{
2625 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2626 if (vc->vc_toggle_meta)
2627 c |= 0x80;
2628
2629 return vc->vc_translate[c];
2630 }
2631
2632 return c;
2633}
2634
ede98d12
JS		 2635
2636/**
2637 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2638 * @c: the received character, or U+FFFD for invalid sequences.
2639 */
2640static inline int vc_sanitize_unicode(const int c)
2641{
2642 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2643 return 0xfffd;
2644
2645 return c;
2646}
2647
694d8a48
JS		 2648/**
2649 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
ea239f1e
JS		 2650 * @vc: virtual console
2651 * @c: character to translate
2652 * @rescan: we return true if we need more (continuation) data
694d8a48
JS		 2653 *
2654 * @vc_utf_char is the being-constructed unicode character.
2655 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2656 * @vc_npar is the number of continuation bytes arrived so far.
2657 */
2658static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2659{
2660 static const u32 utf8_length_changes[] = {
2661 0x0000007f, 0x000007ff, 0x0000ffff,
2662 0x001fffff, 0x03ffffff, 0x7fffffff
2663 };
2664
ede98d12 2665 /* Continuation byte received */
694d8a48 2666 if ((c & 0xc0) == 0x80) {
ede98d12
JS		 2667 /* Unexpected continuation byte? */
2668 if (!vc->vc_utf_count)
694d8a48 2669 return 0xfffd;
ede98d12
JS		 2670
2671 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2672 vc->vc_npar++;
2673 if (--vc->vc_utf_count)
2674 goto need_more_bytes;
2675
2676 /* Got a whole character */
2677 c = vc->vc_utf_char;
2678 /* Reject overlong sequences */
2679 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2680 c > utf8_length_changes[vc->vc_npar])
694d8a48 2681 return 0xfffd;
ede98d12
JS		 2682
2683 return vc_sanitize_unicode(c);
694d8a48 2684 }
ede98d12
JS		 2685
2686 /* Single ASCII byte or first byte of a sequence received */
2687 if (vc->vc_utf_count) {
2688 /* Continuation byte expected */
2689 *rescan = true;
2690 vc->vc_utf_count = 0;
694d8a48 2691 return 0xfffd;
ede98d12 2692 }
694d8a48 2693
ede98d12
JS		 2694 /* Nothing to do if an ASCII byte was received */
2695 if (c <= 0x7f)
2696 return c;
2697
2698 /* First byte of a multibyte sequence received */
2699 vc->vc_npar = 0;
2700 if ((c & 0xe0) == 0xc0) {
2701 vc->vc_utf_count = 1;
2702 vc->vc_utf_char = (c & 0x1f);
2703 } else if ((c & 0xf0) == 0xe0) {
2704 vc->vc_utf_count = 2;
2705 vc->vc_utf_char = (c & 0x0f);
2706 } else if ((c & 0xf8) == 0xf0) {
2707 vc->vc_utf_count = 3;
2708 vc->vc_utf_char = (c & 0x07);
2709 } else if ((c & 0xfc) == 0xf8) {
2710 vc->vc_utf_count = 4;
2711 vc->vc_utf_char = (c & 0x03);
2712 } else if ((c & 0xfe) == 0xfc) {
2713 vc->vc_utf_count = 5;
2714 vc->vc_utf_char = (c & 0x01);
2715 } else {
2716 /* 254 and 255 are invalid */
2717 return 0xfffd;
2718 }
2719
2720need_more_bytes:
2721 return -1;
694d8a48
JS		 2722}
2723
a4236348
JS		 2724static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2725{
2726 /* Do no translation at all in control states */
2727 if (vc->vc_state != ESnormal)
2728 return *c;
2729
2730 if (vc->vc_utf && !vc->vc_disp_ctrl)
2731 return *c = vc_translate_unicode(vc, *c, rescan);
2732
2733 /* no utf or alternate charset mode */
2734 return vc_translate_ascii(vc, *c);
2735}
2736
881c8783
JS		 2737static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2738{
2739 if (!vc->vc_can_do_color)
2740 return vc->vc_attr ^ 0x08;
2741
2742 if (vc->vc_hi_font_mask == 0x100)
2743 return (vc->vc_attr & 0x11) |
2744 ((vc->vc_attr & 0xe0) >> 4) |
2745 ((vc->vc_attr & 0x0e) << 4);
2746
2747 return (vc->vc_attr & 0x88) |
2748 ((vc->vc_attr & 0x70) >> 4) |
2749 ((vc->vc_attr & 0x07) << 4);
2750}
2751
754bda98
JS		 2752static bool vc_is_control(struct vc_data *vc, int tc, int c)
2753{
2754 /*
2755 * A bitmap for codes <32. A bit of 1 indicates that the code
2756 * corresponding to that bit number invokes some special action (such
2757 * as cursor movement) and should not be displayed as a glyph unless
2758 * the disp_ctrl mode is explicitly enabled.
2759 */
2760 static const u32 CTRL_ACTION = 0x0d00ff81;
2761 /* Cannot be overridden by disp_ctrl */
2762 static const u32 CTRL_ALWAYS = 0x0800f501;
2763
2764 if (vc->vc_state != ESnormal)
2765 return true;
2766
2767 if (!tc)
2768 return true;
2769
2770 /*
2771 * If the original code was a control character we only allow a glyph
2772 * to be displayed if the code is not normally used (such as for cursor
2773 * movement) or if the disp_ctrl mode has been explicitly enabled.
2774 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2775 * displayed as control characters, as the console would be pretty
2776 * useless without them; to display an arbitrary font position use the
2777 * direct-to-font zone in UTF-8 mode.
2778 */
2779 if (c < 32) {
2780 if (vc->vc_disp_ctrl)
2781 return CTRL_ALWAYS & BIT(c);
2782 else
2783 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2784 }
2785
2786 if (c == 127 && !vc->vc_disp_ctrl)
2787 return true;
2788
2789 if (c == 128 + 27)
2790 return true;
2791
2792 return false;
2793}
2794
391536ab
JS		 2795static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2796 struct vc_draw_region *draw)
2797{
2798 int next_c;
f3205b29 2799 unsigned char vc_attr = vc->vc_attr;
391536ab
JS		 2800 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2801 u8 width = 1;
2802 bool inverse = false;
2803
2804 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2805 if (is_double_width(c))
2806 width = 2;
2807 }
2808
2809 /* Now try to find out how to display it */
2810 tc = conv_uni_to_pc(vc, tc);
2811 if (tc & ~charmask) {
2812 if (tc == -1 || tc == -2)
2813 return -1; /* nothing to display */
2814
2815 /* Glyph not found */
6923e2d7 2816 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
391536ab
JS		 2817 !(c & ~charmask)) {
2818 /*
2819 * In legacy mode use the glyph we get by a 1:1
2820 * mapping.
2821 * This would make absolutely no sense with Unicode in
2822 * mind, but do this for ASCII characters since a font
2823 * may lack Unicode mapping info and we don't want to
2824 * end up with having question marks only.
2825 */
2826 tc = c;
2827 } else {
2828 /*
2829 * Display U+FFFD. If it's not found, display an inverse
2830 * question mark.
2831 */
2832 tc = conv_uni_to_pc(vc, 0xfffd);
2833 if (tc < 0) {
2834 inverse = true;
2835 tc = conv_uni_to_pc(vc, '?');
2836 if (tc < 0)
2837 tc = '?';
f3205b29
JS		 2838
2839 vc_attr = vc_invert_attr(vc);
2840 con_flush(vc, draw);
391536ab
JS		 2841 }
2842 }
2843 }
2844
391536ab
JS		 2845 next_c = c;
2846 while (1) {
2847 if (vc->vc_need_wrap || vc->vc_decim)
2848 con_flush(vc, draw);
2849 if (vc->vc_need_wrap) {
2850 cr(vc);
2851 lf(vc);
2852 }
2853 if (vc->vc_decim)
2854 insert_char(vc, 1);
2855 vc_uniscr_putc(vc, next_c);
f1bcbe14
JS		 2856
2857 if (himask)
2858 tc = ((tc & 0x100) ? himask : 0) |
2859 (tc & 0xff);
2860 tc |= (vc_attr << 8) & ~himask;
2861
2862 scr_writew(tc, (u16 *)vc->vc_pos);
2863
391536ab
JS		 2864 if (con_should_update(vc) && draw->x < 0) {
2865 draw->x = vc->state.x;
2866 draw->from = vc->vc_pos;
2867 }
2868 if (vc->state.x == vc->vc_cols - 1) {
2869 vc->vc_need_wrap = vc->vc_decawm;
2870 draw->to = vc->vc_pos + 2;
2871 } else {
2872 vc->state.x++;
2873 draw->to = (vc->vc_pos += 2);
2874 }
2875
2876 if (!--width)
2877 break;
2878
2879 /* A space is printed in the second column */
2880 tc = conv_uni_to_pc(vc, ' ');
2881 if (tc < 0)
2882 tc = ' ';
2883 next_c = ' ';
2884 }
2885 notify_write(vc, c);
2886
2887 if (inverse)
2888 con_flush(vc, draw);
2889
2890 return 0;
2891}
2892
ac751efa 2893/* acquires console_lock */
1da177e4
LT		 2894static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2895{
917ae1a9
JS		 2896 struct vc_draw_region draw = {
2897 .x = -1,
2898 };
391536ab 2899 int c, tc, n = 0;
1da177e4 2900 unsigned int currcons;
1da177e4 2901 struct vc_data *vc;
0341a4d0 2902 struct vt_notifier_param param;
da823b2d 2903 bool rescan;
1da177e4
LT		 2904
2905 if (in_interrupt())
2906 return count;
2907
ac751efa 2908 console_lock();
1da177e4
LT		 2909 vc = tty->driver_data;
2910 if (vc == NULL) {
bccf1da3 2911 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2912 console_unlock();
1da177e4
LT		 2913 return 0;
2914 }
2915
2916 currcons = vc->vc_num;
2917 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2918 /* could this happen? */
2919 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2920 console_unlock();
2921 return 0;
1da177e4 2922 }
1da177e4 2923
1da177e4
LT		 2924
2925 /* undraw cursor first */
6ca8dfd7 2926 if (con_is_fg(vc))
1da177e4
LT		 2927 hide_cursor(vc);
2928
0341a4d0
KD		 2929 param.vc = vc;
2930
6e94dbc7 2931 while (!tty->flow.stopped && count) {
1da177e4 2932 int orig = *buf;
1da177e4
LT		 2933 buf++;
2934 n++;
2935 count--;
0d1ffef5
JS		 2936rescan_last_byte:
2937 c = orig;
da823b2d 2938 rescan = false;
1da177e4 2939
a4236348
JS		 2940 tc = vc_translate(vc, &c, &rescan);
2941 if (tc == -1)
2942 continue;
1da177e4 2943
0341a4d0
KD		 2944 param.c = tc;
2945 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2946 &param) == NOTIFY_STOP)
2947 continue;
2948
391536ab
JS		 2949 if (vc_is_control(vc, tc, c)) {
2950 con_flush(vc, &draw);
2951 do_con_trol(tty, vc, orig);
1da177e4
LT		 2952 continue;
2953 }
391536ab
JS		 2954
2955 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2956 continue;
2957
2958 if (rescan)
2959 goto rescan_last_byte;
1da177e4 2960 }
917ae1a9 2961 con_flush(vc, &draw);
0224080f 2962 vc_uniscr_debug_check(vc);
1da177e4 2963 console_conditional_schedule();
b293d758 2964 notify_update(vc);
7e1d2263 2965 console_unlock();
1da177e4 2966 return n;
1da177e4
LT		 2967}
2968
2969/*
2970 * This is the console switching callback.
2971 *
2972 * Doing console switching in a process context allows
2973 * us to do the switches asynchronously (needed when we want
2974 * to switch due to a keyboard interrupt). Synchronization
2975 * with other console code and prevention of re-entrancy is
ac751efa 2976 * ensured with console_lock.
1da177e4 2977 */
65f27f38 2978static void console_callback(struct work_struct *ignored)
1da177e4 2979{
ac751efa 2980 console_lock();
1da177e4
LT		 2981
2982 if (want_console >= 0) {
2983 if (want_console != fg_console &&
2984 vc_cons_allocated(want_console)) {
2985 hide_cursor(vc_cons[fg_console].d);
2986 change_console(vc_cons[want_console].d);
2987 /* we only changed when the console had already
2988 been allocated - a new console is not created
2989 in an interrupt routine */
2990 }
2991 want_console = -1;
2992 }
2993 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2994 do_poke_blanked_console = 0;
2995 poke_blanked_console();
2996 }
2997 if (scrollback_delta) {
2998 struct vc_data *vc = vc_cons[fg_console].d;
2999 clear_selection();
97293de9 3000 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 3001 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3002 scrollback_delta = 0;
3003 }
3004 if (blank_timer_expired) {
3005 do_blank_screen(0);
3006 blank_timer_expired = 0;
3007 }
b293d758 3008 notify_update(vc_cons[fg_console].d);
1da177e4 3009
ac751efa 3010 console_unlock();
1da177e4
LT		 3011}
3012
b257bc05 3013int set_console(int nr)
1da177e4 3014{
b257bc05
AJ		 3015 struct vc_data *vc = vc_cons[fg_console].d;
3016
3017 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3018 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3019
3020 /*
3021 * Console switch will fail in console_callback() or
3022 * change_console() so there is no point scheduling
3023 * the callback
3024 *
3025 * Existing set_console() users don't check the return
3026 * value so this shouldn't break anything
3027 */
3028 return -EINVAL;
3029 }
3030
1da177e4
LT		 3031 want_console = nr;
3032 schedule_console_callback();
b257bc05
AJ		 3033
3034 return 0;
1da177e4
LT		 3035}
3036
3037struct tty_driver *console_driver;
3038
3039#ifdef CONFIG_VT_CONSOLE
3040
5ada918b
BW		 3041/**
3042 * vt_kmsg_redirect() - Sets/gets the kernel message console
3043 * @new: The new virtual terminal number or -1 if the console should stay
3044 * unchanged
3045 *
3046 * By default, the kernel messages are always printed on the current virtual
3047 * console. However, the user may modify that default with the
3048 * TIOCL_SETKMSGREDIRECT ioctl call.
3049 *
3050 * This function sets the kernel message console to be @new. It returns the old
3051 * virtual console number. The virtual terminal number 0 (both as parameter and
3052 * return value) means no redirection (i.e. always printed on the currently
3053 * active console).
3054 *
3055 * The parameter -1 means that only the current console is returned, but the
3056 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3057 * case to make the code more understandable.
3058 *
3059 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3060 * the parameter and always returns 0.
3061 */
3062int vt_kmsg_redirect(int new)
3063{
3064 static int kmsg_con;
3065
3066 if (new != -1)
3067 return xchg(&kmsg_con, new);
3068 else
3069 return kmsg_con;
3070}
3071
1da177e4
LT		 3072/*
3073 * Console on virtual terminal
3074 *
3075 * The console must be locked when we get here.
3076 */
3077
3078static void vt_console_print(struct console *co, const char *b, unsigned count)
3079{
3080 struct vc_data *vc = vc_cons[fg_console].d;
3081 unsigned char c;
b0940003 3082 static DEFINE_SPINLOCK(printing_lock);
1da177e4 3083 const ushort *start;
6609cff6 3084 ushort start_x, cnt;
5ada918b 3085 int kmsg_console;
1da177e4 3086
b74dbbe1
DV		 3087 WARN_CONSOLE_UNLOCKED();
3088
3089 /* this protects against concurrent oops only */
b0940003 3090 if (!spin_trylock(&printing_lock))
1da177e4
LT		 3091 return;
3092
5ada918b
BW		 3093 kmsg_console = vt_get_kmsg_redirect();
3094 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3095 vc = vc_cons[kmsg_console - 1].d;
1da177e4 3096
1da177e4
LT		 3097 if (!vc_cons_allocated(fg_console)) {
3098 /* impossible */
3099 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3100 goto quit;
3101 }
3102
8d7fc299 3103 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 3104 goto quit;
3105
3106 /* undraw cursor first */
6ca8dfd7 3107 if (con_is_fg(vc))
1da177e4
LT		 3108 hide_cursor(vc);
3109
3110 start = (ushort *)vc->vc_pos;
28bc24fc 3111 start_x = vc->state.x;
6609cff6 3112 cnt = 0;
1da177e4
LT		 3113 while (count--) {
3114 c = *b++;
3115 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
6609cff6 3116 if (cnt && con_is_visible(vc))
28bc24fc 3117 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
6609cff6 3118 cnt = 0;
1da177e4
LT		 3119 if (c == 8) { /* backspace */
3120 bs(vc);
3121 start = (ushort *)vc->vc_pos;
28bc24fc 3122 start_x = vc->state.x;
1da177e4
LT		 3123 continue;
3124 }
3125 if (c != 13)
3126 lf(vc);
3127 cr(vc);
3128 start = (ushort *)vc->vc_pos;
28bc24fc 3129 start_x = vc->state.x;
1da177e4
LT		 3130 if (c == 10 || c == 13)
3131 continue;
3132 }
6609cff6 3133 vc_uniscr_putc(vc, c);
1da177e4 3134 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 3135 notify_write(vc, c);
1da177e4 3136 cnt++;
28bc24fc 3137 if (vc->state.x == vc->vc_cols - 1) {
1da177e4 3138 vc->vc_need_wrap = 1;
6609cff6
NP		 3139 } else {
3140 vc->vc_pos += 2;
28bc24fc 3141 vc->state.x++;
1da177e4
LT		 3142 }
3143 }
6609cff6 3144 if (cnt && con_is_visible(vc))
28bc24fc 3145 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
1da177e4 3146 set_cursor(vc);
b293d758 3147 notify_update(vc);
1da177e4
LT		 3148
3149quit:
b0940003 3150 spin_unlock(&printing_lock);
1da177e4
LT		 3151}
3152
3153static struct tty_driver *vt_console_device(struct console *c, int *index)
3154{
3155 *index = c->index ? c->index-1 : fg_console;
3156 return console_driver;
3157}
3158
3159static struct console vt_console_driver = {
3160 .name = "tty",
3161 .write = vt_console_print,
3162 .device = vt_console_device,
3163 .unblank = unblank_screen,
3164 .flags = CON_PRINTBUFFER,
3165 .index = -1,
3166};
3167#endif
3168
3169/*
3170 * Handling of Linux-specific VC ioctls
3171 */
3172
3173/*
ac751efa 3174 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3175 *
3176 * There are some functions which don't need it.
3177 *
3178 * There are some functions which can sleep for arbitrary periods
3179 * (paste_selection) but we don't need the lock there anyway.
3180 *
496124e5 3181 * set_selection_user has locking, and definitely needs it
1da177e4
LT		 3182 */
3183
3184int tioclinux(struct tty_struct *tty, unsigned long arg)
3185{
3186 char type, data;
3187 char __user *p = (char __user *)arg;
3188 int lines;
3189 int ret;
3190
1da177e4
LT		 3191 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3192 return -EPERM;
3193 if (get_user(type, p))
3194 return -EFAULT;
3195 ret = 0;
04f378b1 3196
1da177e4
LT		 3197 switch (type)
3198 {
3199 case TIOCL_SETSEL:
496124e5
OK		 3200 ret = set_selection_user((struct tiocl_selection
3201 __user *)(p+1), tty);
1da177e4
LT		 3202 break;
3203 case TIOCL_PASTESEL:
3204 ret = paste_selection(tty);
3205 break;
3206 case TIOCL_UNBLANKSCREEN:
ac751efa 3207 console_lock();
1da177e4 3208 unblank_screen();
ac751efa 3209 console_unlock();
1da177e4
LT		 3210 break;
3211 case TIOCL_SELLOADLUT:
5289475d 3212 console_lock();
1da177e4 3213 ret = sel_loadlut(p);
5289475d 3214 console_unlock();
1da177e4
LT		 3215 break;
3216 case TIOCL_GETSHIFTSTATE:
04f378b1 3217
1da177e4
LT		 3218 /*
3219 * Make it possible to react to Shift+Mousebutton.
3220 * Note that 'shift_state' is an undocumented
3221 * kernel-internal variable; programs not closely
3222 * related to the kernel should not use this.
3223 */
079c9534 3224 data = vt_get_shift_state();
6987dc8a 3225 ret = put_user(data, p);
1da177e4
LT		 3226 break;
3227 case TIOCL_GETMOUSEREPORTING:
20f62579 3228 console_lock(); /* May be overkill */
1da177e4 3229 data = mouse_reporting();
20f62579 3230 console_unlock();
6987dc8a 3231 ret = put_user(data, p);
1da177e4
LT		 3232 break;
3233 case TIOCL_SETVESABLANK:
20f62579 3234 console_lock();
403aac96 3235 ret = set_vesa_blanking(p);
20f62579 3236 console_unlock();
1da177e4 3237 break;
0ca07731 3238 case TIOCL_GETKMSGREDIRECT:
5ada918b 3239 data = vt_get_kmsg_redirect();
6987dc8a 3240 ret = put_user(data, p);
0ca07731 3241 break;
1da177e4
LT		 3242 case TIOCL_SETKMSGREDIRECT:
3243 if (!capable(CAP_SYS_ADMIN)) {
3244 ret = -EPERM;
3245 } else {
3246 if (get_user(data, p+1))
3247 ret = -EFAULT;
3248 else
5ada918b 3249 vt_kmsg_redirect(data);
1da177e4
LT		 3250 }
3251 break;
3252 case TIOCL_GETFGCONSOLE:
20f62579
AC		 3253 /* No locking needed as this is a transiently
3254 correct return anyway if the caller hasn't
3255 disabled switching */
1da177e4
LT		 3256 ret = fg_console;
3257 break;
3258 case TIOCL_SCROLLCONSOLE:
3259 if (get_user(lines, (s32 __user *)(p+4))) {
3260 ret = -EFAULT;
3261 } else {
20f62579
AC		 3262 /* Need the console lock here. Note that lots
3263 of other calls need fixing before the lock
3264 is actually useful ! */
3265 console_lock();
1da177e4 3266 scrollfront(vc_cons[fg_console].d, lines);
20f62579 3267 console_unlock();
1da177e4
LT		 3268 ret = 0;
3269 }
3270 break;
3271 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 3272 console_lock();
1da177e4
LT		 3273 ignore_poke = 1;
3274 do_blank_screen(0);
ac751efa 3275 console_unlock();
1da177e4
LT		 3276 break;
3277 case TIOCL_BLANKEDSCREEN:
3278 ret = console_blanked;
3279 break;
3280 default:
3281 ret = -EINVAL;
3282 break;
3283 }
3284 return ret;
3285}
3286
3287/*
3288 * /dev/ttyN handling
3289 */
3290
3291static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3292{
3293 int retval;
3294
3295 retval = do_con_write(tty, buf, count);
3296 con_flush_chars(tty);
3297
3298 return retval;
3299}
3300
5d19f546 3301static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4 3302{
5d19f546 3303 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3304}
3305
03b3b1a2 3306static unsigned int con_write_room(struct tty_struct *tty)
1da177e4 3307{
6e94dbc7 3308 if (tty->flow.stopped)
1da177e4 3309 return 0;
a88a69c9 3310 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3311}
3312
1da177e4
LT		 3313/*
3314 * con_throttle and con_unthrottle are only used for
3315 * paste_selection(), which has to stuff in a large number of
3316 * characters...
3317 */
3318static void con_throttle(struct tty_struct *tty)
3319{
3320}
3321
3322static void con_unthrottle(struct tty_struct *tty)
3323{
3324 struct vc_data *vc = tty->driver_data;
3325
3326 wake_up_interruptible(&vc->paste_wait);
3327}
3328
3329/*
3330 * Turn the Scroll-Lock LED on when the tty is stopped
3331 */
3332static void con_stop(struct tty_struct *tty)
3333{
3334 int console_num;
3335 if (!tty)
3336 return;
3337 console_num = tty->index;
3338 if (!vc_cons_allocated(console_num))
3339 return;
079c9534 3340 vt_kbd_con_stop(console_num);
1da177e4
LT		 3341}
3342
3343/*
3344 * Turn the Scroll-Lock LED off when the console is started
3345 */
3346static void con_start(struct tty_struct *tty)
3347{
3348 int console_num;
3349 if (!tty)
3350 return;
3351 console_num = tty->index;
3352 if (!vc_cons_allocated(console_num))
3353 return;
079c9534 3354 vt_kbd_con_start(console_num);
1da177e4
LT		 3355}
3356
3357static void con_flush_chars(struct tty_struct *tty)
3358{
3359 struct vc_data *vc;
3360
3361 if (in_interrupt()) /* from flush_to_ldisc */
3362 return;
3363
3364 /* if we race with con_close(), vt may be null */
ac751efa 3365 console_lock();
1da177e4
LT		 3366 vc = tty->driver_data;
3367 if (vc)
3368 set_cursor(vc);
ac751efa 3369 console_unlock();
1da177e4
LT		 3370}
3371
3372/*
3373 * Allocate the console screen memory.
3374 */
bc1e99d9 3375static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3376{
3377 unsigned int currcons = tty->index;
bc1e99d9
JS		 3378 struct vc_data *vc;
3379 int ret;
1da177e4 3380
ac751efa 3381 console_lock();
bc1e99d9
JS		 3382 ret = vc_allocate(currcons);
3383 if (ret)
3384 goto unlock;
feebed65 3385
bc1e99d9 3386 vc = vc_cons[currcons].d;
1da177e4 3387
bc1e99d9
JS		 3388 /* Still being freed */
3389 if (vc->port.tty) {
3390 ret = -ERESTARTSYS;
3391 goto unlock;
3392 }
3393
3394 ret = tty_port_install(&vc->port, driver, tty);
3395 if (ret)
3396 goto unlock;
3397
3398 tty->driver_data = vc;
3399 vc->port.tty = tty;
ca4463bf 3400 tty_port_get(&vc->port);
bc1e99d9
JS		 3401
3402 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3403 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3404 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3405 }
bc1e99d9 3406 if (vc->vc_utf)
adc8d746 3407 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3408 else
adc8d746 3409 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3410unlock:
ac751efa 3411 console_unlock();
1da177e4
LT		 3412 return ret;
3413}
3414
bc1e99d9
JS		 3415static int con_open(struct tty_struct *tty, struct file *filp)
3416{
3417 /* everything done in install */
3418 return 0;
3419}
3420
3421
1da177e4
LT		 3422static void con_close(struct tty_struct *tty, struct file *filp)
3423{
feebed65
AC		 3424 /* Nothing to do - we defer to shutdown */
3425}
1da177e4 3426
feebed65
AC		 3427static void con_shutdown(struct tty_struct *tty)
3428{
3429 struct vc_data *vc = tty->driver_data;
3430 BUG_ON(vc == NULL);
ac751efa 3431 console_lock();
8ce73264 3432 vc->port.tty = NULL;
ac751efa 3433 console_unlock();
1da177e4
LT		 3434}
3435
ca4463bf
EB		 3436static void con_cleanup(struct tty_struct *tty)
3437{
3438 struct vc_data *vc = tty->driver_data;
3439
3440 tty_port_put(&vc->port);
3441}
3442
3855ae1c 3443static int default_color = 7; /* white */
fa6ce9ab
JE		 3444static int default_italic_color = 2; // green (ASCII)
3445static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3446module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3447module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3448module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3449
1da177e4
LT		 3450static void vc_init(struct vc_data *vc, unsigned int rows,
3451 unsigned int cols, int do_clear)
3452{
3453 int j, k ;
3454
3455 vc->vc_cols = cols;
3456 vc->vc_rows = rows;
3457 vc->vc_size_row = cols << 1;
3458 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3459
3460 set_origin(vc);
3461 vc->vc_pos = vc->vc_origin;
3462 reset_vc(vc);
3463 for (j=k=0; j<16; j++) {
3464 vc->vc_palette[k++] = default_red[j] ;
3465 vc->vc_palette[k++] = default_grn[j] ;
3466 vc->vc_palette[k++] = default_blu[j] ;
3467 }
3855ae1c 3468 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3469 vc->vc_ulcolor = default_underline_color;
3470 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3471 vc->vc_halfcolor = 0x08; /* grey */
3472 init_waitqueue_head(&vc->paste_wait);
3473 reset_terminal(vc, do_clear);
3474}
3475
3476/*
3477 * This routine initializes console interrupts, and does nothing
3478 * else. If you want the screen to clear, call tty_write with
3479 * the appropriate escape-sequence.
3480 */
3481
3482static int __init con_init(void)
3483{
3484 const char *display_desc = NULL;
3485 struct vc_data *vc;
3e795de7 3486 unsigned int currcons = 0, i;
1da177e4 3487
ac751efa 3488 console_lock();
1da177e4 3489
805ece2a
AS		 3490 if (!conswitchp)
3491 conswitchp = &dummy_con;
3492 display_desc = conswitchp->con_startup();
1da177e4
LT		 3493 if (!display_desc) {
3494 fg_console = 0;
ac751efa 3495 console_unlock();
1da177e4
LT		 3496 return 0;
3497 }
3498
3e795de7
AD		 3499 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500 struct con_driver *con_driver = &registered_con_driver[i];
3501
3502 if (con_driver->con == NULL) {
3503 con_driver->con = conswitchp;
3504 con_driver->desc = display_desc;
3505 con_driver->flag = CON_DRIVER_FLAG_INIT;
3506 con_driver->first = 0;
3507 con_driver->last = MAX_NR_CONSOLES - 1;
3508 break;
3509 }
3510 }
3511
3512 for (i = 0; i < MAX_NR_CONSOLES; i++)
3513 con_driver_map[i] = conswitchp;
3514
1da177e4
LT		 3515 if (blankinterval) {
3516 blank_state = blank_normal_wait;
f324edc8 3517 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3518 }
3519
1da177e4 3520 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3521 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3522 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3523 tty_port_init(&vc->port);
1da177e4 3524 visual_init(vc, currcons, 1);
ce684552 3525 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
a5f4f52e 3526 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3527 vc_init(vc, vc->vc_rows, vc->vc_cols,
3528 currcons || !vc->vc_sw->con_save_screen);
3529 }
3530 currcons = fg_console = 0;
3531 master_display_fg = vc = vc_cons[currcons].d;
3532 set_origin(vc);
3533 save_screen(vc);
28bc24fc 3534 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 3535 csi_J(vc, 0);
3536 update_screen(vc);
5da527aa 3537 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3538 vc->vc_can_do_color ? "colour" : "mono",
3539 display_desc, vc->vc_cols, vc->vc_rows);
1da177e4 3540
ac751efa 3541 console_unlock();
1da177e4
LT		 3542
3543#ifdef CONFIG_VT_CONSOLE
3544 register_console(&vt_console_driver);
3545#endif
3546 return 0;
3547}
3548console_initcall(con_init);
3549
b68e31d0 3550static const struct tty_operations con_ops = {
bc1e99d9 3551 .install = con_install,
1da177e4
LT		 3552 .open = con_open,
3553 .close = con_close,
3554 .write = con_write,
3555 .write_room = con_write_room,
3556 .put_char = con_put_char,
3557 .flush_chars = con_flush_chars,
1da177e4 3558 .ioctl = vt_ioctl,
e9216651
AB		 3559#ifdef CONFIG_COMPAT
3560 .compat_ioctl = vt_compat_ioctl,
3561#endif
1da177e4
LT		 3562 .stop = con_stop,
3563 .start = con_start,
3564 .throttle = con_throttle,
3565 .unthrottle = con_unthrottle,
8c9a9dd0 3566 .resize = vt_resize,
ca4463bf
EB		 3567 .shutdown = con_shutdown,
3568 .cleanup = con_cleanup,
1da177e4
LT		 3569};
3570
d81ed103
AC		 3571static struct cdev vc0_cdev;
3572
fbc92a34
KS		 3573static ssize_t show_tty_active(struct device *dev,
3574 struct device_attribute *attr, char *buf)
3575{
3576 return sprintf(buf, "tty%d\n", fg_console + 1);
3577}
3578static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3579
1083a7be
TI		 3580static struct attribute *vt_dev_attrs[] = {
3581 &dev_attr_active.attr,
3582 NULL
3583};
3584
3585ATTRIBUTE_GROUPS(vt_dev);
3586
d81ed103 3587int __init vty_init(const struct file_operations *console_fops)
1da177e4 3588{
d81ed103
AC		 3589 cdev_init(&vc0_cdev, console_fops);
3590 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3591 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3592 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3593 tty0dev = device_create_with_groups(tty_class, NULL,
3594 MKDEV(TTY_MAJOR, 0), NULL,
3595 vt_dev_groups, "tty0");
fbc92a34
KS		 3596 if (IS_ERR(tty0dev))
3597 tty0dev = NULL;
d81ed103 3598
1da177e4
LT		 3599 vcs_init();
3600
39b7b42b
JS		 3601 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3602 TTY_DRIVER_RESET_TERMIOS);
3603 if (IS_ERR(console_driver))
1da177e4 3604 panic("Couldn't allocate console driver\n");
2f16669d 3605
1da177e4
LT		 3606 console_driver->name = "tty";
3607 console_driver->name_base = 1;
3608 console_driver->major = TTY_MAJOR;
3609 console_driver->minor_start = 1;
3610 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3611 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3612 if (default_utf8)
3613 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3614 tty_set_operations(console_driver, &con_ops);
3615 if (tty_register_driver(console_driver))
3616 panic("Couldn't register console driver\n");
1da177e4
LT		 3617 kbd_init();
3618 console_map_init();
1da177e4
LT		 3619#ifdef CONFIG_MDA_CONSOLE
3620 mda_console_init();
3621#endif
3622 return 0;
3623}
3624
3625#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3626
3627static struct class *vtconsole_class;
3628
50e244cc 3629static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3630 int deflt)
1da177e4 3631{
3e795de7
AD		 3632 struct module *owner = csw->owner;
3633 const char *desc = NULL;
3634 struct con_driver *con_driver;
3635 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3636
1da177e4
LT		 3637 if (!try_module_get(owner))
3638 return -ENODEV;
3639
50e244cc 3640 WARN_CONSOLE_UNLOCKED();
1c8ce271 3641
3e795de7
AD		 3642 /* check if driver is registered */
3643 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3644 con_driver = &registered_con_driver[i];
3645
3646 if (con_driver->con == csw) {
3647 desc = con_driver->desc;
3648 retval = 0;
3649 break;
3650 }
3651 }
3652
3653 if (retval)
3654 goto err;
3655
3656 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3657 csw->con_startup();
3658 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3659 }
1c8ce271 3660
1da177e4
LT		 3661 if (deflt) {
3662 if (conswitchp)
3663 module_put(conswitchp->owner);
1c8ce271 3664
1da177e4
LT		 3665 __module_get(owner);
3666 conswitchp = csw;
3667 }
3668
3e795de7
AD		 3669 first = max(first, con_driver->first);
3670 last = min(last, con_driver->last);
3671
1da177e4
LT		 3672 for (i = first; i <= last; i++) {
3673 int old_was_color;
3674 struct vc_data *vc = vc_cons[i].d;
3675
3676 if (con_driver_map[i])
3677 module_put(con_driver_map[i]->owner);
3678 __module_get(owner);
3679 con_driver_map[i] = csw;
3680
3681 if (!vc || !vc->vc_sw)
3682 continue;
3683
3684 j = i;
1c8ce271 3685
6ca8dfd7 3686 if (con_is_visible(vc)) {
4ee1acce 3687 k = i;
1da177e4 3688 save_screen(vc);
4ee1acce
DH		 3689 }
3690
1da177e4
LT		 3691 old_was_color = vc->vc_can_do_color;
3692 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3693 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3694 visual_init(vc, i, 0);
1c8ce271 3695 set_origin(vc);
1da177e4
LT		 3696 update_attr(vc);
3697
3698 /* If the console changed between mono <-> color, then
3699 * the attributes in the screenbuf will be wrong. The
3700 * following resets all attributes to something sane.
3701 */
3702 if (old_was_color != vc->vc_can_do_color)
3703 clear_buffer_attributes(vc);
1da177e4 3704 }
4ee1acce 3705
1ffdda95 3706 pr_info("Console: switching ");
1da177e4 3707 if (!deflt)
bccf1da3 3708 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3709 if (j >= 0) {
3710 struct vc_data *vc = vc_cons[j].d;
3711
bccf1da3
JP		 3712 pr_cont("to %s %s %dx%d\n",
3713 vc->vc_can_do_color ? "colour" : "mono",
3714 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3715
3716 if (k >= 0) {
3717 vc = vc_cons[k].d;
3718 update_screen(vc);
3719 }
bccf1da3
JP		 3720 } else {
3721 pr_cont("to %s\n", desc);
3722 }
1da177e4 3723
3e795de7
AD		 3724 retval = 0;
3725err:
1da177e4 3726 module_put(owner);
3e795de7
AD		 3727 return retval;
3728};
1da177e4 3729
50e244cc 3730
13ae6645 3731#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86 3732int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3733{
3e795de7
AD		 3734 struct module *owner = csw->owner;
3735 const struct consw *defcsw = NULL;
3736 struct con_driver *con_driver = NULL, *con_back = NULL;
3737 int i, retval = -ENODEV;
1da177e4 3738
3e795de7
AD		 3739 if (!try_module_get(owner))
3740 return -ENODEV;
3741
e93a9a86 3742 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3743
3744 /* check if driver is registered and if it is unbindable */
3745 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3746 con_driver = &registered_con_driver[i];
3747
3748 if (con_driver->con == csw &&
6db4063c 3749 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3750 retval = 0;
3751 break;
3752 }
3753 }
3754
e93a9a86 3755 if (retval)
3e795de7 3756 goto err;
3e795de7 3757
6db4063c
AD		 3758 retval = -ENODEV;
3759
3e795de7
AD		 3760 /* check if backup driver exists */
3761 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3762 con_back = &registered_con_driver[i];
3763
249f7b3e 3764 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3765 defcsw = con_back->con;
3766 retval = 0;
3767 break;
3768 }
3769 }
3770
e93a9a86 3771 if (retval)
3e795de7 3772 goto err;
3e795de7 3773
e93a9a86 3774 if (!con_is_bound(csw))
3e795de7 3775 goto err;
3e795de7
AD		 3776
3777 first = max(first, con_driver->first);
3778 last = min(last, con_driver->last);
3779
3780 for (i = first; i <= last; i++) {
1da177e4
LT		 3781 if (con_driver_map[i] == csw) {
3782 module_put(csw->owner);
3783 con_driver_map[i] = NULL;
3784 }
3e795de7
AD		 3785 }
3786
3787 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3788 const struct consw *defconsw = conswitchp;
3789
3e795de7
AD		 3790 defcsw->con_startup();
3791 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3792 /*
3793 * vgacon may change the default driver to point
3794 * to dummycon, we restore it here...
3795 */
3796 conswitchp = defconsw;
3e795de7
AD		 3797 }
3798
3799 if (!con_is_bound(csw))
3800 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3801
6db4063c 3802 /* ignore return value, binding should not fail */
50e244cc 3803 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3804err:
3805 module_put(owner);
3806 return retval;
3807
3808}
e93a9a86 3809EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3810
6db4063c
AD		 3811static int vt_bind(struct con_driver *con)
3812{
3813 const struct consw *defcsw = NULL, *csw = NULL;
3814 int i, more = 1, first = -1, last = -1, deflt = 0;
3815
77232f79 3816 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3817 goto err;
3818
3819 csw = con->con;
3820
3821 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3822 struct con_driver *con = &registered_con_driver[i];
3823
3824 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3825 defcsw = con->con;
3826 break;
3827 }
3828 }
3829
3830 if (!defcsw)
3831 goto err;
3832
3833 while (more) {
3834 more = 0;
3835
3836 for (i = con->first; i <= con->last; i++) {
3837 if (con_driver_map[i] == defcsw) {
3838 if (first == -1)
3839 first = i;
3840 last = i;
3841 more = 1;
3842 } else if (first != -1)
3843 break;
3844 }
3845
3846 if (first == 0 && last == MAX_NR_CONSOLES -1)
3847 deflt = 1;
3848
4c215fe8 3849 if (first != -1)
c62a1e57 3850 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3851
3852 first = -1;
3853 last = -1;
3854 deflt = 0;
3855 }
3856
3857err:
3858 return 0;
3859}
3860
3861static int vt_unbind(struct con_driver *con)
3862{
3863 const struct consw *csw = NULL;
3864 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3865 int ret;
6db4063c 3866
77232f79 3867 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3868 goto err;
3869
3870 csw = con->con;
3871
3872 while (more) {
3873 more = 0;
3874
3875 for (i = con->first; i <= con->last; i++) {
3876 if (con_driver_map[i] == csw) {
3877 if (first == -1)
3878 first = i;
3879 last = i;
3880 more = 1;
3881 } else if (first != -1)
3882 break;
3883 }
3884
3885 if (first == 0 && last == MAX_NR_CONSOLES -1)
3886 deflt = 1;
3887
618f2b90 3888 if (first != -1) {
f418f2ec 3889 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3890 if (ret != 0)
3891 return ret;
618f2b90 3892 }
6db4063c
AD		 3893
3894 first = -1;
3895 last = -1;
3896 deflt = 0;
3897 }
3898
3899err:
3900 return 0;
3901}
13ae6645
AD		 3902#else
3903static inline int vt_bind(struct con_driver *con)
3904{
3905 return 0;
3906}
3907static inline int vt_unbind(struct con_driver *con)
3908{
3909 return 0;
3910}
3911#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3912
805952a8 3913static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3914 const char *buf, size_t count)
3915{
805952a8 3916 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3917 int bind = simple_strtoul(buf, NULL, 0);
3918
4c215fe8
ID		 3919 console_lock();
3920
6db4063c
AD		 3921 if (bind)
3922 vt_bind(con);
3923 else
3924 vt_unbind(con);
3925
4c215fe8
ID		 3926 console_unlock();
3927
6db4063c
AD		 3928 return count;
3929}
3930
805952a8
GKH		 3931static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3932 char *buf)
6db4063c 3933{
805952a8 3934 struct con_driver *con = dev_get_drvdata(dev);
61d51456
DV		 3935 int bind;
3936
3937 console_lock();
3938 bind = con_is_bound(con->con);
3939 console_unlock();
6db4063c 3940
ebaed53c 3941 return sysfs_emit(buf, "%i\n", bind);
6db4063c
AD		 3942}
3943
805952a8
GKH		 3944static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3945 char *buf)
6db4063c 3946{
805952a8 3947 struct con_driver *con = dev_get_drvdata(dev);
6db4063c 3948
ebaed53c 3949 return sysfs_emit(buf, "%s %s\n",
6db4063c
AD		 3950 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3951 con->desc);
3952
3953}
3954
1083a7be
TI		 3955static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3956static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3957
3958static struct attribute *con_dev_attrs[] = {
3959 &dev_attr_bind.attr,
3960 &dev_attr_name.attr,
3961 NULL
6db4063c
AD		 3962};
3963
1083a7be
TI		 3964ATTRIBUTE_GROUPS(con_dev);
3965
805952a8 3966static int vtconsole_init_device(struct con_driver *con)
6db4063c 3967{
928e964f 3968 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3969 return 0;
6db4063c
AD		 3970}
3971
805952a8 3972static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3973{
1083a7be 3974 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3975}
3976
3e795de7
AD		 3977/**
3978 * con_is_bound - checks if driver is bound to the console
3979 * @csw: console driver
3980 *
3981 * RETURNS: zero if unbound, nonzero if bound
3982 *
3983 * Drivers can call this and if zero, they should release
3984 * all resources allocated on con_startup()
3985 */
3986int con_is_bound(const struct consw *csw)
3987{
3988 int i, bound = 0;
3989
ddde3c18
DV		 3990 WARN_CONSOLE_UNLOCKED();
3991
3e795de7
AD		 3992 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3993 if (con_driver_map[i] == csw) {
3994 bound = 1;
3995 break;
3996 }
3997 }
3998
3999 return bound;
4000}
4001EXPORT_SYMBOL(con_is_bound);
4002
ddde3c18
DV		 4003/**
4004 * con_is_visible - checks whether the current console is visible
4005 * @vc: virtual console
4006 *
4007 * RETURNS: zero if not visible, nonzero if visible
4008 */
4009bool con_is_visible(const struct vc_data *vc)
4010{
4011 WARN_CONSOLE_UNLOCKED();
4012
4013 return *vc->vc_display_fg == vc;
4014}
4015EXPORT_SYMBOL(con_is_visible);
4016
b45cfba4
JB		 4017/**
4018 * con_debug_enter - prepare the console for the kernel debugger
ea239f1e 4019 * @vc: virtual console
b45cfba4
JB		 4020 *
4021 * Called when the console is taken over by the kernel debugger, this
4022 * function needs to save the current console state, then put the console
4023 * into a state suitable for the kernel debugger.
4024 *
4025 * RETURNS:
4026 * Zero on success, nonzero if a failure occurred when trying to prepare
4027 * the console for the debugger.
4028 */
4029int con_debug_enter(struct vc_data *vc)
4030{
4031 int ret = 0;
4032
4033 saved_fg_console = fg_console;
4034 saved_last_console = last_console;
4035 saved_want_console = want_console;
4036 saved_vc_mode = vc->vc_mode;
beed5336 4037 saved_console_blanked = console_blanked;
b45cfba4
JB		 4038 vc->vc_mode = KD_TEXT;
4039 console_blanked = 0;
4040 if (vc->vc_sw->con_debug_enter)
4041 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 4042#ifdef CONFIG_KGDB_KDB
4043 /* Set the initial LINES variable if it is not already set */
4044 if (vc->vc_rows < 999) {
4045 int linecount;
4046 char lns[4];
4047 const char *setargs[3] = {
4048 "set",
4049 "LINES",
4050 lns,
4051 };
4052 if (kdbgetintenv(setargs[0], &linecount)) {
4053 snprintf(lns, 4, "%i", vc->vc_rows);
4054 kdb_set(2, setargs);
4055 }
4056 }
17b572e8
JW		 4057 if (vc->vc_cols < 999) {
4058 int colcount;
4059 char cols[4];
4060 const char *setargs[3] = {
4061 "set",
4062 "COLUMNS",
4063 cols,
4064 };
4065 if (kdbgetintenv(setargs[0], &colcount)) {
4066 snprintf(cols, 4, "%i", vc->vc_cols);
4067 kdb_set(2, setargs);
4068 }
4069 }
81d44507 4070#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 4071 return ret;
4072}
4073EXPORT_SYMBOL_GPL(con_debug_enter);
4074
4075/**
4076 * con_debug_leave - restore console state
b45cfba4
JB		 4077 *
4078 * Restore the console state to what it was before the kernel debugger
4079 * was invoked.
4080 *
4081 * RETURNS:
4082 * Zero on success, nonzero if a failure occurred when trying to restore
4083 * the console.
4084 */
4085int con_debug_leave(void)
4086{
4087 struct vc_data *vc;
4088 int ret = 0;
4089
4090 fg_console = saved_fg_console;
4091 last_console = saved_last_console;
4092 want_console = saved_want_console;
beed5336 4093 console_blanked = saved_console_blanked;
b45cfba4
JB		 4094 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4095
4096 vc = vc_cons[fg_console].d;
4097 if (vc->vc_sw->con_debug_leave)
4098 ret = vc->vc_sw->con_debug_leave(vc);
4099 return ret;
4100}
4101EXPORT_SYMBOL_GPL(con_debug_leave);
4102
50e244cc 4103static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 4104{
4105 struct module *owner = csw->owner;
4106 struct con_driver *con_driver;
4107 const char *desc;
96317e9e 4108 int i, retval;
3e795de7 4109
50e244cc
AC		 4110 WARN_CONSOLE_UNLOCKED();
4111
3e795de7
AD		 4112 if (!try_module_get(owner))
4113 return -ENODEV;
4114
3e795de7
AD		 4115 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4116 con_driver = &registered_con_driver[i];
4117
4118 /* already registered */
96317e9e 4119 if (con_driver->con == csw) {
c55c63c6 4120 retval = -EBUSY;
96317e9e
JS		 4121 goto err;
4122 }
3e795de7
AD		 4123 }
4124
3e795de7 4125 desc = csw->con_startup();
6798df4c
JS		 4126 if (!desc) {
4127 retval = -ENODEV;
3e795de7 4128 goto err;
6798df4c 4129 }
3e795de7
AD		 4130
4131 retval = -EINVAL;
4132
4133 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4134 con_driver = &registered_con_driver[i];
4135
d364b5c3
ID		 4136 if (con_driver->con == NULL &&
4137 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 4138 con_driver->con = csw;
4139 con_driver->desc = desc;
6db4063c
AD		 4140 con_driver->node = i;
4141 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 4142 CON_DRIVER_FLAG_INIT;
4143 con_driver->first = first;
4144 con_driver->last = last;
4145 retval = 0;
4146 break;
4147 }
4148 }
4149
6db4063c
AD		 4150 if (retval)
4151 goto err;
4152
1083a7be
TI		 4153 con_driver->dev =
4154 device_create_with_groups(vtconsole_class, NULL,
4155 MKDEV(0, con_driver->node),
4156 con_driver, con_dev_groups,
4157 "vtcon%i", con_driver->node);
805952a8 4158 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 4159 pr_warn("Unable to create device for %s; errno = %ld\n",
4160 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 4161 con_driver->dev = NULL;
6db4063c 4162 } else {
805952a8 4163 vtconsole_init_device(con_driver);
6db4063c 4164 }
928e964f 4165
3e795de7 4166err:
3e795de7
AD		 4167 module_put(owner);
4168 return retval;
4169}
50e244cc 4170
3e795de7
AD		 4171
4172/**
50539dd4 4173 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 4174 * @csw: console driver
4175 *
4176 * DESCRIPTION: All drivers that registers to the console layer must
4177 * call this function upon exit, or if the console driver is in a state
4178 * where it won't be able to handle console services, such as the
4179 * framebuffer console without loaded framebuffer drivers.
4180 *
4181 * The driver must unbind first prior to unregistration.
4182 */
e93a9a86
TI		 4183int do_unregister_con_driver(const struct consw *csw)
4184{
d9c660e7 4185 int i;
3e795de7
AD		 4186
4187 /* cannot unregister a bound driver */
4188 if (con_is_bound(csw))
d9c660e7
DV		 4189 return -EBUSY;
4190
4191 if (csw == conswitchp)
4192 return -EINVAL;
3e795de7
AD		 4193
4194 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4195 struct con_driver *con_driver = &registered_con_driver[i];
4196
2cf30f75 4197 if (con_driver->con == csw) {
d364b5c3
ID		 4198 /*
4199 * Defer the removal of the sysfs entries since that
4200 * will acquire the kernfs s_active lock and we can't
4201 * acquire this lock while holding the console lock:
4202 * the unbind sysfs entry imposes already the opposite
4203 * order. Reset con already here to prevent any later
4204 * lookup to succeed and mark this slot as zombie, so
4205 * it won't get reused until we complete the removal
4206 * in the deferred work.
4207 */
3e795de7 4208 con_driver->con = NULL;
d364b5c3
ID		 4209 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4210 schedule_work(&con_driver_unregister_work);
4211
d9c660e7 4212 return 0;
3e795de7
AD		 4213 }
4214 }
d9c660e7
DV		 4215
4216 return -ENODEV;
3e795de7 4217}
e93a9a86 4218EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4219
d364b5c3
ID		 4220static void con_driver_unregister_callback(struct work_struct *ignored)
4221{
4222 int i;
4223
4224 console_lock();
4225
4226 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4227 struct con_driver *con_driver = &registered_con_driver[i];
4228
4229 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4230 continue;
4231
4232 console_unlock();
4233
4234 vtconsole_deinit_device(con_driver);
4235 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4236
4237 console_lock();
4238
4239 if (WARN_ON_ONCE(con_driver->con))
4240 con_driver->con = NULL;
4241 con_driver->desc = NULL;
4242 con_driver->dev = NULL;
4243 con_driver->node = 0;
4244 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4245 con_driver->flag = 0;
4246 con_driver->first = 0;
4247 con_driver->last = 0;
4248 }
4249
4250 console_unlock();
4251}
4252
3e795de7
AD		 4253/*
4254 * If we support more console drivers, this function is used
4255 * when a driver wants to take over some existing consoles
4256 * and become default driver for newly opened ones.
4257 *
0095ab42 4258 * do_take_over_console is basically a register followed by bind
50e244cc
AC		 4259 */
4260int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4261{
4262 int err;
4263
4264 err = do_register_con_driver(csw, first, last);
4265 /*
4266 * If we get an busy error we still want to bind the console driver
4267 * and return success, as we may have unbound the console driver
4268 * but not unregistered it.
4269 */
4270 if (err == -EBUSY)
4271 err = 0;
4272 if (!err)
4273 do_bind_con_driver(csw, first, last, deflt);
4274
4275 return err;
4276}
4277EXPORT_SYMBOL_GPL(do_take_over_console);
4278
3e795de7
AD		 4279
4280/*
4281 * give_up_console is a wrapper to unregister_con_driver. It will only
4282 * work if driver is fully unbound.
4283 */
4284void give_up_console(const struct consw *csw)
4285{
70125e76
WY		 4286 console_lock();
4287 do_unregister_con_driver(csw);
4288 console_unlock();
3e795de7
AD		 4289}
4290
6db4063c 4291static int __init vtconsole_class_init(void)
3e795de7 4292{
6db4063c 4293 int i;
3e795de7 4294
6db4063c
AD		 4295 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4296 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4297 pr_warn("Unable to create vt console class; errno = %ld\n",
4298 PTR_ERR(vtconsole_class));
6db4063c
AD		 4299 vtconsole_class = NULL;
4300 }
3e795de7 4301
6db4063c 4302 /* Add system drivers to sysfs */
3e795de7
AD		 4303 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4304 struct con_driver *con = &registered_con_driver[i];
4305
805952a8 4306 if (con->con && !con->dev) {
1083a7be
TI		 4307 con->dev =
4308 device_create_with_groups(vtconsole_class, NULL,
4309 MKDEV(0, con->node),
4310 con, con_dev_groups,
4311 "vtcon%i", con->node);
6db4063c 4312
805952a8 4313 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4314 pr_warn("Unable to create device for %s; errno = %ld\n",
4315 con->desc, PTR_ERR(con->dev));
805952a8 4316 con->dev = NULL;
6db4063c 4317 } else {
805952a8 4318 vtconsole_init_device(con);
6db4063c 4319 }
3e795de7 4320 }
3e795de7
AD		 4321 }
4322
3e795de7
AD		 4323 return 0;
4324}
6db4063c 4325postcore_initcall(vtconsole_class_init);
3e795de7 4326
1da177e4
LT		 4327#endif
4328
4329/*
4330 * Screen blanking
4331 */
4332
403aac96 4333static int set_vesa_blanking(char __user *p)
1da177e4 4334{
403aac96
YY		 4335 unsigned int mode;
4336
4337 if (get_user(mode, p + 1))
4338 return -EFAULT;
4339
4340 vesa_blank_mode = (mode < 4) ? mode : 0;
4341 return 0;
1da177e4
LT		 4342}
4343
1da177e4
LT		 4344void do_blank_screen(int entering_gfx)
4345{
4346 struct vc_data *vc = vc_cons[fg_console].d;
4347 int i;
4348
a135513c
DV		 4349 might_sleep();
4350
1da177e4
LT		 4351 WARN_CONSOLE_UNLOCKED();
4352
4353 if (console_blanked) {
4354 if (blank_state == blank_vesa_wait) {
4355 blank_state = blank_off;
d060a321 4356 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4357 }
4358 return;
4359 }
1da177e4
LT		 4360
4361 /* entering graphics mode? */
4362 if (entering_gfx) {
4363 hide_cursor(vc);
4364 save_screen(vc);
4365 vc->vc_sw->con_blank(vc, -1, 1);
4366 console_blanked = fg_console + 1;
b6e8f00f 4367 blank_state = blank_off;
1da177e4
LT		 4368 set_origin(vc);
4369 return;
4370 }
4371
b6e8f00f 4372 blank_state = blank_off;
4373
1da177e4
LT		 4374 /* don't blank graphics */
4375 if (vc->vc_mode != KD_TEXT) {
4376 console_blanked = fg_console + 1;
4377 return;
4378 }
4379
4380 hide_cursor(vc);
4381 del_timer_sync(&console_timer);
4382 blank_timer_expired = 0;
4383
4384 save_screen(vc);
4385 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4386 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4387 console_blanked = fg_console + 1;
4388 if (i)
4389 set_origin(vc);
4390
4391 if (console_blank_hook && console_blank_hook(1))
4392 return;
4393
d060a321 4394 if (vesa_off_interval && vesa_blank_mode) {
030babac 4395 blank_state = blank_vesa_wait;
1da177e4
LT		 4396 mod_timer(&console_timer, jiffies + vesa_off_interval);
4397 }
8b92e87d 4398 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4399}
4400EXPORT_SYMBOL(do_blank_screen);
4401
4402/*
4403 * Called by timer as well as from vt_console_driver
4404 */
4405void do_unblank_screen(int leaving_gfx)
4406{
4407 struct vc_data *vc;
4408
4409 /* This should now always be called from a "sane" (read: can schedule)
4410 * context for the sake of the low level drivers, except in the special
4411 * case of oops_in_progress
4412 */
4413 if (!oops_in_progress)
4414 might_sleep();
4415
4416 WARN_CONSOLE_UNLOCKED();
4417
4418 ignore_poke = 0;
4419 if (!console_blanked)
4420 return;
4421 if (!vc_cons_allocated(fg_console)) {
4422 /* impossible */
e620e548
JP		 4423 pr_warn("unblank_screen: tty %d not allocated ??\n",
4424 fg_console + 1);
1da177e4
LT		 4425 return;
4426 }
4427 vc = vc_cons[fg_console].d;
8d7fc299 4428 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4429 return; /* but leave console_blanked != 0 */
4430
4431 if (blankinterval) {
f324edc8 4432 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4433 blank_state = blank_normal_wait;
4434 }
4435
4436 console_blanked = 0;
8d7fc299 4437 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4438 /* Low-level driver cannot restore -> do it ourselves */
4439 update_screen(vc);
4440 if (console_blank_hook)
4441 console_blank_hook(0);
4442 set_palette(vc);
4443 set_cursor(vc);
8b92e87d 4444 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4445}
4446EXPORT_SYMBOL(do_unblank_screen);
4447
4448/*
4449 * This is called by the outside world to cause a forced unblank, mostly for
4450 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4451 * call it with 1 as an argument and so force a mode restore... that may kill
4452 * X or at least garbage the screen but would also make the Oops visible...
4453 */
0a64ce6e 4454static void unblank_screen(void)
1da177e4
LT		 4455{
4456 do_unblank_screen(0);
4457}
4458
4459/*
70522e12 4460 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4461 * (console operations can still happen at irq time, but only from printk which
70522e12 4462 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4463 */
24ed960a 4464static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4465{
4466 blank_timer_expired = 1;
4467 schedule_work(&console_work);
4468}
4469
4470void poke_blanked_console(void)
4471{
4472 WARN_CONSOLE_UNLOCKED();
4473
4474 /* Add this so we quickly catch whoever might call us in a non
4475 * safe context. Nowadays, unblank_screen() isn't to be called in
4476 * atomic contexts and is allowed to schedule (with the special case
4477 * of oops_in_progress, but that isn't of any concern for this
4478 * function. --BenH.
4479 */
4480 might_sleep();
4481
4482 /* This isn't perfectly race free, but a race here would be mostly harmless,
22fce66c 4483 * at worst, we'll do a spurious blank and it's unlikely
1da177e4
LT		 4484 */
4485 del_timer(&console_timer);
4486 blank_timer_expired = 0;
4487
4488 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4489 return;
4490 if (console_blanked)
4491 unblank_screen();
4492 else if (blankinterval) {
f324edc8 4493 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4494 blank_state = blank_normal_wait;
4495 }
4496}
4497
4498/*
4499 * Palettes
4500 */
4501
4502static void set_palette(struct vc_data *vc)
4503{
4504 WARN_CONSOLE_UNLOCKED();
4505
709280da 4506 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4507 vc->vc_sw->con_set_palette(vc, color_table);
4508}
4509
1da177e4
LT		 4510/*
4511 * Load palette into the DAC registers. arg points to a colour
4512 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4513 */
4514
4515int con_set_cmap(unsigned char __user *arg)
4516{
871bdea6
MG		 4517 int i, j, k;
4518 unsigned char colormap[3*16];
4519
4520 if (copy_from_user(colormap, arg, sizeof(colormap)))
4521 return -EFAULT;
1da177e4 4522
ac751efa 4523 console_lock();
871bdea6
MG		 4524 for (i = k = 0; i < 16; i++) {
4525 default_red[i] = colormap[k++];
4526 default_grn[i] = colormap[k++];
4527 default_blu[i] = colormap[k++];
4528 }
4529 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4530 if (!vc_cons_allocated(i))
4531 continue;
4532 for (j = k = 0; j < 16; j++) {
4533 vc_cons[i].d->vc_palette[k++] = default_red[j];
4534 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4535 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4536 }
4537 set_palette(vc_cons[i].d);
4538 }
ac751efa 4539 console_unlock();
1da177e4 4540
871bdea6 4541 return 0;
1da177e4
LT		 4542}
4543
4544int con_get_cmap(unsigned char __user *arg)
4545{
871bdea6
MG		 4546 int i, k;
4547 unsigned char colormap[3*16];
1da177e4 4548
ac751efa 4549 console_lock();
871bdea6
MG		 4550 for (i = k = 0; i < 16; i++) {
4551 colormap[k++] = default_red[i];
4552 colormap[k++] = default_grn[i];
4553 colormap[k++] = default_blu[i];
4554 }
ac751efa 4555 console_unlock();
1da177e4 4556
871bdea6
MG		 4557 if (copy_to_user(arg, colormap, sizeof(colormap)))
4558 return -EFAULT;
4559
4560 return 0;
1da177e4
LT		 4561}
4562
4563void reset_palette(struct vc_data *vc)
4564{
4565 int j, k;
4566 for (j=k=0; j<16; j++) {
4567 vc->vc_palette[k++] = default_red[j];
4568 vc->vc_palette[k++] = default_grn[j];
4569 vc->vc_palette[k++] = default_blu[j];
4570 }
4571 set_palette(vc);
4572}
4573
4574/*
4575 * Font switching
4576 *
4577 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4578 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4579 * depending on width) reserved for each character which is kinda wasty, but
4580 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4581 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4582 * format (maybe we should add a `fontoffset' field to the `display'
4583 * structure so we won't have to convert the fontdata all the time.
4584 * /Jes
4585 */
4586
4587#define max_font_size 65536
4588
4589static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4590{
4591 struct console_font font;
4592 int rc = -EINVAL;
4593 int c;
4594
1da177e4
LT		 4595 if (op->data) {
4596 font.data = kmalloc(max_font_size, GFP_KERNEL);
4597 if (!font.data)
4598 return -ENOMEM;
4599 } else
4600 font.data = NULL;
4601
ac751efa 4602 console_lock();
edab558f
AC		 4603 if (vc->vc_mode != KD_TEXT)
4604 rc = -EINVAL;
4605 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4606 rc = vc->vc_sw->con_font_get(vc, &font);
4607 else
4608 rc = -ENOSYS;
ac751efa 4609 console_unlock();
1da177e4
LT		 4610
4611 if (rc)
4612 goto out;
4613
4614 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4615
1da177e4
LT		 4616 if (op->data && font.charcount > op->charcount)
4617 rc = -ENOSPC;
ff2047fb
JS		 4618 if (font.width > op->width || font.height > op->height)
4619 rc = -ENOSPC;
1da177e4
LT		 4620 if (rc)
4621 goto out;
4622
4623 op->height = font.height;
4624 op->width = font.width;
4625 op->charcount = font.charcount;
4626
4627 if (op->data && copy_to_user(op->data, font.data, c))
4628 rc = -EFAULT;
4629
4630out:
4631 kfree(font.data);
4632 return rc;
4633}
4634
4635static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4636{
4637 struct console_font font;
4638 int rc = -EINVAL;
4639 int size;
4640
4641 if (vc->vc_mode != KD_TEXT)
4642 return -EINVAL;
4643 if (!op->data)
4644 return -EINVAL;
4645 if (op->charcount > 512)
4646 return -EINVAL;
ff2047fb 4647 if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
8ffb8209
MX		 4648 return -EINVAL;
4649 size = (op->width+7)/8 * 32 * op->charcount;
4650 if (size > max_font_size)
4651 return -ENOSPC;
4652
4653 font.data = memdup_user(op->data, size);
4654 if (IS_ERR(font.data))
4655 return PTR_ERR(font.data);
4656
1da177e4 4657 font.charcount = op->charcount;
1da177e4 4658 font.width = op->width;
8ffb8209
MX		 4659 font.height = op->height;
4660
ac751efa 4661 console_lock();
edab558f
AC		 4662 if (vc->vc_mode != KD_TEXT)
4663 rc = -EINVAL;
566f9c9f
HD		 4664 else if (vc->vc_sw->con_font_set) {
4665 if (vc_is_sel(vc))
4666 clear_selection();
1da177e4 4667 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
566f9c9f 4668 } else
1da177e4 4669 rc = -ENOSYS;
ac751efa 4670 console_unlock();
1da177e4
LT		 4671 kfree(font.data);
4672 return rc;
4673}
4674
4675static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4676{
4677 struct console_font font = {.width = op->width, .height = op->height};
4678 char name[MAX_FONT_NAME];
4679 char *s = name;
4680 int rc;
4681
1da177e4
LT		 4682
4683 if (!op->data)
4684 s = NULL;
4685 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4686 return -EFAULT;
4687 else
4688 name[MAX_FONT_NAME - 1] = 0;
4689
ac751efa 4690 console_lock();
edab558f
AC		 4691 if (vc->vc_mode != KD_TEXT) {
4692 console_unlock();
4693 return -EINVAL;
4694 }
566f9c9f
HD		 4695 if (vc->vc_sw->con_font_default) {
4696 if (vc_is_sel(vc))
4697 clear_selection();
1da177e4 4698 rc = vc->vc_sw->con_font_default(vc, &font, s);
566f9c9f 4699 } else
1da177e4 4700 rc = -ENOSYS;
ac751efa 4701 console_unlock();
1da177e4
LT		 4702 if (!rc) {
4703 op->width = font.width;
4704 op->height = font.height;
4705 }
4706 return rc;
4707}
4708
1da177e4
LT		 4709int con_font_op(struct vc_data *vc, struct console_font_op *op)
4710{
4711 switch (op->op) {
4712 case KD_FONT_OP_SET:
4713 return con_font_set(vc, op);
4714 case KD_FONT_OP_GET:
4715 return con_font_get(vc, op);
4716 case KD_FONT_OP_SET_DEFAULT:
4717 return con_font_default(vc, op);
4718 case KD_FONT_OP_COPY:
3c4e0dff
DV		 4719 /* was buggy and never really used */
4720 return -EINVAL;
1da177e4
LT		 4721 }
4722 return -ENOSYS;
4723}
4724
4725/*
4726 * Interface exported to selection and vcs.
4727 */
4728
4729/* used by selection */
d73568c4 4730u16 screen_glyph(const struct vc_data *vc, int offset)
1da177e4 4731{
b8209f69 4732 u16 w = scr_readw(screenpos(vc, offset, true));
1da177e4
LT		 4733 u16 c = w & 0xff;
4734
4735 if (w & vc->vc_hi_font_mask)
4736 c |= 0x100;
4737 return c;
4738}
f7511d5f 4739EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4740
d73568c4 4741u32 screen_glyph_unicode(const struct vc_data *vc, int n)
9bfdc261
AB		 4742{
4743 struct uni_screen *uniscr = get_vc_uniscr(vc);
4744
4745 if (uniscr)
4746 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
d9ebb906 4747 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
9bfdc261
AB		 4748}
4749EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4750
1da177e4 4751/* used by vcs - note the word offset */
b8209f69 4752unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
1da177e4
LT		 4753{
4754 return screenpos(vc, 2 * w_offset, viewed);
4755}
88867e3d 4756EXPORT_SYMBOL_GPL(screen_pos);
1da177e4 4757
a5c6bd80 4758void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
1da177e4 4759{
8a085494 4760 /* clamp values if they don't fit */
a5c6bd80
JS		 4761 xy[0] = min(vc->state.x, 0xFFu);
4762 xy[1] = min(vc->state.y, 0xFFu);
1da177e4
LT		 4763}
4764
a5c6bd80 4765void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
1da177e4 4766{
9477e260 4767 hide_cursor(vc);
a5c6bd80 4768 gotoxy(vc, xy[0], xy[1]);
1da177e4
LT		 4769 set_cursor(vc);
4770}
4771
d73568c4 4772u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
1da177e4
LT		 4773{
4774 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4775 return softcursor_original;
4776 return scr_readw(org);
4777}
4778
4779void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4780{
4781 scr_writew(val, org);
4782 if ((unsigned long)org == vc->vc_pos) {
4783 softcursor_original = -1;
4784 add_softcursor(vc);
4785 }
4786}
4787
432c9ed2
NP		 4788void vcs_scr_updated(struct vc_data *vc)
4789{
4790 notify_update(vc);
4791}
4792
35cc56f9
JS		 4793void vc_scrolldelta_helper(struct vc_data *c, int lines,
4794 unsigned int rolled_over, void *base, unsigned int size)
4795{
4796 unsigned long ubase = (unsigned long)base;
210fd746
JS		 4797 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4798 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4799 ptrdiff_t origin = (void *)c->vc_origin - base;
35cc56f9 4800 int margin = c->vc_size_row * 4;
7c918cdc 4801 int from, wrap, from_off, avail;
35cc56f9
JS		 4802
4803 /* Turn scrollback off */
4804 if (!lines) {
4805 c->vc_visible_origin = c->vc_origin;
4806 return;
4807 }
4808
4809 /* Do we have already enough to allow jumping from 0 to the end? */
210fd746 4810 if (rolled_over > scr_end + margin) {
7c918cdc
JS		 4811 from = scr_end;
4812 wrap = rolled_over + c->vc_size_row;
35cc56f9 4813 } else {
7c918cdc
JS		 4814 from = 0;
4815 wrap = size;
35cc56f9
JS		 4816 }
4817
7c918cdc
JS		 4818 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4819 avail = (origin - from + wrap) % wrap;
35cc56f9
JS		 4820
4821 /* Only a little piece would be left? Show all incl. the piece! */
7c918cdc 4822 if (avail < 2 * margin)
35cc56f9 4823 margin = 0;
7c918cdc
JS		 4824 if (from_off < margin)
4825 from_off = 0;
4826 if (from_off > avail - margin)
4827 from_off = avail;
35cc56f9 4828
7c918cdc 4829 c->vc_visible_origin = ubase + (from + from_off) % wrap;
35cc56f9
JS		 4830}
4831EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4832
1da177e4
LT		 4833/*
4834 * Visible symbols for modules
4835 */
4836
4837EXPORT_SYMBOL(color_table);
4838EXPORT_SYMBOL(default_red);
4839EXPORT_SYMBOL(default_grn);
4840EXPORT_SYMBOL(default_blu);
4841EXPORT_SYMBOL(update_region);
4842EXPORT_SYMBOL(redraw_screen);
4843EXPORT_SYMBOL(vc_resize);
4844EXPORT_SYMBOL(fg_console);
4845EXPORT_SYMBOL(console_blank_hook);
4846EXPORT_SYMBOL(console_blanked);
4847EXPORT_SYMBOL(vc_cons);
f6c06b68 4848EXPORT_SYMBOL(global_cursor_default);
1da177e4 4849#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4850EXPORT_SYMBOL(give_up_console);
4851#endif
Linux 6.x block layer and io_uring tree(s)