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vt: make vc_data pointers const in selection.h
[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
LT		 156static void set_palette(struct vc_data *vc);
157
52c40fca
PH		 158#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
159
1da177e4 160static int printable; /* Is console ready for printing? */
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
JS		 286static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
287 int 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 *);
9a98e7a8 347 p = vmalloc(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 */
d73568c4 547void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, int 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 */
756void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
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) {
815 scr_writew(old, screenpos(vc, old_offset, 1));
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;
1da177e4
LT		 827 p = screenpos(vc, offset, 1);
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);
28bc24fc
JS		 858 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
859 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
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) {
1039 set_leds();
1040 compute_shiftstate();
8182ec49 1041 notify_update(vc);
1da177e4
LT		 1042 }
1043}
1044
1045/*
1046 * Allocation, freeing and resizing of VTs.
1047 */
1048
1049int vc_cons_allocated(unsigned int i)
1050{
1051 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1052}
1053
1054static void visual_init(struct vc_data *vc, int num, int init)
1055{
1056 /* ++Geert: vc->vc_sw->con_init determines console size */
1057 if (vc->vc_sw)
1058 module_put(vc->vc_sw->owner);
1059 vc->vc_sw = conswitchp;
1060#ifndef VT_SINGLE_DRIVER
1061 if (con_driver_map[num])
1062 vc->vc_sw = con_driver_map[num];
1063#endif
1064 __module_get(vc->vc_sw->owner);
1065 vc->vc_num = num;
1066 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 1067 if (vc->vc_uni_pagedir_loc)
1068 con_free_unimap(vc);
1da177e4 1069 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 1070 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 1071 vc->vc_hi_font_mask = 0;
1072 vc->vc_complement_mask = 0;
1073 vc->vc_can_do_color = 0;
1b45996d 1074 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1075 vc->vc_sw->con_init(vc, init);
1076 if (!vc->vc_complement_mask)
1077 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1078 vc->vc_s_complement_mask = vc->vc_complement_mask;
1079 vc->vc_size_row = vc->vc_cols << 1;
1080 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1081}
1082
a1ad1cc9
GH		 1083
1084static void visual_deinit(struct vc_data *vc)
1085{
1086 vc->vc_sw->con_deinit(vc);
1087 module_put(vc->vc_sw->owner);
1088}
1089
ca4463bf
EB		 1090static void vc_port_destruct(struct tty_port *port)
1091{
1092 struct vc_data *vc = container_of(port, struct vc_data, port);
1093
1094 kfree(vc);
1095}
1096
1097static const struct tty_port_operations vc_port_ops = {
1098 .destruct = vc_port_destruct,
1099};
1100
ce684552
TH		 1101/*
1102 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1103 * [this is to be used together with some user program
1104 * like resize that changes the hardware videomode]
1105 */
1106#define VC_MAXCOL (32767)
1107#define VC_MAXROW (32767)
1108
1da177e4
LT		 1109int vc_allocate(unsigned int currcons) /* return 0 on success */
1110{
34902b7f
JS		 1111 struct vt_notifier_param param;
1112 struct vc_data *vc;
ce684552 1113 int err;
34902b7f 1114
1da177e4
LT		 1115 WARN_CONSOLE_UNLOCKED();
1116
1117 if (currcons >= MAX_NR_CONSOLES)
1118 return -ENXIO;
34902b7f
JS		 1119
1120 if (vc_cons[currcons].d)
1121 return 0;
1122
1123 /* due to the granularity of kmalloc, we waste some memory here */
1124 /* the alloc is done in two steps, to optimize the common situation
1125 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1126 /* although the numbers above are not valid since long ago, the
1127 point is still up-to-date and the comment still has its value
1128 even if only as a historical artifact. --mj, July 1998 */
1129 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1130 if (!vc)
1da177e4 1131 return -ENOMEM;
34902b7f
JS		 1132
1133 vc_cons[currcons].d = vc;
1134 tty_port_init(&vc->port);
ca4463bf 1135 vc->port.ops = &vc_port_ops;
34902b7f
JS		 1136 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1137
1138 visual_init(vc, currcons, 1);
1139
1140 if (!*vc->vc_uni_pagedir_loc)
1da177e4 1141 con_set_default_unimap(vc);
f6c06b68 1142
ce684552
TH		 1143 err = -EINVAL;
1144 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1145 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1146 goto err_free;
1147 err = -ENOMEM;
21eff69a 1148 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1149 if (!vc->vc_screenbuf)
1150 goto err_free;
1151
1152 /* If no drivers have overridden us and the user didn't pass a
1153 boot option, default to displaying the cursor */
1154 if (global_cursor_default == -1)
1155 global_cursor_default = 1;
1156
1157 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1158 vcs_make_sysfs(currcons);
1159 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1160
1da177e4 1161 return 0;
34902b7f 1162err_free:
a1ad1cc9 1163 visual_deinit(vc);
34902b7f
JS		 1164 kfree(vc);
1165 vc_cons[currcons].d = NULL;
ce684552 1166 return err;
1da177e4
LT		 1167}
1168
e400b6ec
AD		 1169static inline int resize_screen(struct vc_data *vc, int width, int height,
1170 int user)
1da177e4
LT		 1171{
1172 /* Resizes the resolution of the display adapater */
1173 int err = 0;
1174
1175 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 1176 err = vc->vc_sw->con_resize(vc, width, height, user);
1177
1da177e4
LT		 1178 return err;
1179}
1180
8c9a9dd0
AC		 1181/**
1182 * vc_do_resize - resizing method for the tty
1183 * @tty: tty being resized
1184 * @real_tty: real tty (different to tty if a pty/tty pair)
1185 * @vc: virtual console private data
1186 * @cols: columns
1187 * @lines: lines
1188 *
1189 * Resize a virtual console, clipping according to the actual constraints.
1190 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1191 * information and perform any necessary signal handling.
8c9a9dd0 1192 *
6a1c0680 1193 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 1194 * ctrl_lock of the tty IFF a tty is passed.
1195 */
1196
fc6f6238
AC		 1197static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1198 unsigned int cols, unsigned int lines)
1da177e4
LT		 1199{
1200 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1201 unsigned long end;
d8ae7242 1202 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1203 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1204 unsigned int user;
1da177e4 1205 unsigned short *newscreen;
d8ae7242 1206 struct uni_screen *new_uniscr = NULL;
1da177e4
LT		 1207
1208 WARN_CONSOLE_UNLOCKED();
1209
1210 if (!vc)
1211 return -ENXIO;
1212
e400b6ec
AD		 1213 user = vc->vc_resize_user;
1214 vc->vc_resize_user = 0;
1215
ce684552 1216 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1da177e4
LT		 1217 return -EINVAL;
1218
1219 new_cols = (cols ? cols : vc->vc_cols);
1220 new_rows = (lines ? lines : vc->vc_rows);
1221 new_row_size = new_cols << 1;
1222 new_screen_size = new_row_size * new_rows;
1223
1224 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1225 return 0;
1226
ce684552 1227 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
32b2921e 1228 return -EINVAL;
21eff69a 1229 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1230 if (!newscreen)
1231 return -ENOMEM;
1232
d8ae7242
NP		 1233 if (get_vc_uniscr(vc)) {
1234 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1235 if (!new_uniscr) {
1236 kfree(newscreen);
1237 return -ENOMEM;
1238 }
1239 }
1240
dce05aa6 1241 if (vc_is_sel(vc))
009e39ae
SD		 1242 clear_selection();
1243
1da177e4 1244 old_rows = vc->vc_rows;
1da177e4 1245 old_row_size = vc->vc_size_row;
1da177e4 1246
e400b6ec 1247 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1248 if (err) {
1249 kfree(newscreen);
57d38f26 1250 vc_uniscr_free(new_uniscr);
1da177e4
LT		 1251 return err;
1252 }
1253
1254 vc->vc_rows = new_rows;
1255 vc->vc_cols = new_cols;
1256 vc->vc_size_row = new_row_size;
1257 vc->vc_screenbuf_size = new_screen_size;
1258
1259 rlth = min(old_row_size, new_row_size);
1260 rrem = new_row_size - rlth;
1261 old_origin = vc->vc_origin;
1262 new_origin = (long) newscreen;
1263 new_scr_end = new_origin + new_screen_size;
3b41dc1a 1264
28bc24fc
JS		 1265 if (vc->state.y > new_rows) {
1266 if (old_rows - vc->state.y < new_rows) {
3b41dc1a
AD		 1267 /*
1268 * Cursor near the bottom, copy contents from the
1269 * bottom of buffer
1270 */
d8ae7242 1271 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1272 } else {
1273 /*
1274 * Cursor is in no man's land, copy 1/2 screenful
1275 * from the top and bottom of cursor position
1276 */
28bc24fc 1277 first_copied_row = (vc->state.y - new_rows/2);
3b41dc1a 1278 }
d8ae7242
NP		 1279 old_origin += first_copied_row * old_row_size;
1280 } else
1281 first_copied_row = 0;
9fc2b2d0 1282 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1283
d8ae7242
NP		 1284 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1285 get_vc_uniscr(vc), rlth/2, first_copied_row,
1286 min(old_rows, new_rows));
1287 vc_uniscr_set(vc, new_uniscr);
1288
1da177e4
LT		 1289 update_attr(vc);
1290
3b41dc1a
AD		 1291 while (old_origin < end) {
1292 scr_memcpyw((unsigned short *) new_origin,
1293 (unsigned short *) old_origin, rlth);
1da177e4 1294 if (rrem)
3b41dc1a
AD		 1295 scr_memsetw((void *)(new_origin + rlth),
1296 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1297 old_origin += old_row_size;
1298 new_origin += new_row_size;
1299 }
1300 if (new_scr_end > new_origin)
3b41dc1a
AD		 1301 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1302 new_scr_end - new_origin);
5c9228f0 1303 kfree(vc->vc_screenbuf);
1da177e4 1304 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1305 vc->vc_screenbuf_size = new_screen_size;
1306 set_origin(vc);
1307
1308 /* do part of a reset_terminal() */
1309 vc->vc_top = 0;
1310 vc->vc_bottom = vc->vc_rows;
28bc24fc 1311 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 1312 save_cur(vc);
1313
8c9a9dd0
AC		 1314 if (tty) {
1315 /* Rewrite the requested winsize data with the actual
1316 resulting sizes */
1317 struct winsize ws;
1da177e4
LT		 1318 memset(&ws, 0, sizeof(ws));
1319 ws.ws_row = vc->vc_rows;
1320 ws.ws_col = vc->vc_cols;
1321 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1322 tty_do_resize(tty, &ws);
1da177e4
LT		 1323 }
1324
6ca8dfd7 1325 if (con_is_visible(vc))
1da177e4 1326 update_screen(vc);
8b92e87d 1327 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1328 notify_update(vc);
1da177e4
LT		 1329 return err;
1330}
1331
8c9a9dd0
AC		 1332/**
1333 * vc_resize - resize a VT
1334 * @vc: virtual console
1335 * @cols: columns
1336 * @rows: rows
1337 *
1338 * Resize a virtual console as seen from the console end of things. We
1339 * use the common vc_do_resize methods to update the structures. The
1340 * caller must hold the console sem to protect console internals and
8ce73264 1341 * vc->port.tty
8c9a9dd0
AC		 1342 */
1343
1344int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1345{
8ce73264 1346 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 1347}
1348
1349/**
1350 * vt_resize - resize a VT
1351 * @tty: tty to resize
8c9a9dd0
AC		 1352 * @ws: winsize attributes
1353 *
1354 * Resize a virtual terminal. This is called by the tty layer as we
1355 * register our own handler for resizing. The mutual helper does all
1356 * the actual work.
1357 *
1358 * Takes the console sem and the called methods then take the tty
6a1c0680 1359 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 1360 */
da2bdf9a 1361static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1362{
8c9a9dd0
AC		 1363 struct vc_data *vc = tty->driver_data;
1364 int ret;
ca9bda00 1365
ac751efa 1366 console_lock();
fc6f6238 1367 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1368 console_unlock();
8c9a9dd0 1369 return ret;
ca9bda00 1370}
1da177e4 1371
421b40a6 1372struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1373{
421b40a6
PH		 1374 struct vc_data *vc = NULL;
1375
1da177e4
LT		 1376 WARN_CONSOLE_UNLOCKED();
1377
1378 if (vc_cons_allocated(currcons)) {
421b40a6 1379 struct vt_notifier_param param;
4995f8ef 1380
421b40a6 1381 param.vc = vc = vc_cons[currcons].d;
b293d758 1382 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1383 vcs_remove_sysfs(currcons);
a1ad1cc9 1384 visual_deinit(vc);
bde0d2c9 1385 put_pid(vc->vt_pid);
d8ae7242 1386 vc_uniscr_set(vc, NULL);
5c9228f0 1387 kfree(vc->vc_screenbuf);
1da177e4
LT		 1388 vc_cons[currcons].d = NULL;
1389 }
421b40a6 1390 return vc;
1da177e4
LT		 1391}
1392
1393/*
1394 * VT102 emulator
1395 */
1396
2ff5c5a1
MH		 1397enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1398
079c9534
AC		 1399#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1400#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1401#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1402
1403#define decarm VC_REPEAT
1404#define decckm VC_CKMODE
1405#define kbdapplic VC_APPLIC
1406#define lnm VC_CRLF
1407
8ede5cce 1408const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1409 8,12,10,14, 9,13,11,15 };
1410
1411/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1412unsigned char default_red[] = {
1413 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1414 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1415};
1416module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1417
1418unsigned char default_grn[] = {
1419 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1420 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1421};
1422module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1423
1424unsigned char default_blu[] = {
1425 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1426 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1427};
1428module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1429
1da177e4
LT		 1430/*
1431 * gotoxy() must verify all boundaries, because the arguments
1432 * might also be negative. If the given position is out of
1433 * bounds, the cursor is placed at the nearest margin.
1434 */
1435static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1436{
1437 int min_y, max_y;
1438
1439 if (new_x < 0)
28bc24fc 1440 vc->state.x = 0;
1da177e4
LT		 1441 else {
1442 if (new_x >= vc->vc_cols)
28bc24fc 1443 vc->state.x = vc->vc_cols - 1;
1da177e4 1444 else
28bc24fc 1445 vc->state.x = new_x;
1da177e4
LT		 1446 }
1447
1448 if (vc->vc_decom) {
1449 min_y = vc->vc_top;
1450 max_y = vc->vc_bottom;
1451 } else {
1452 min_y = 0;
1453 max_y = vc->vc_rows;
1454 }
1455 if (new_y < min_y)
28bc24fc 1456 vc->state.y = min_y;
1da177e4 1457 else if (new_y >= max_y)
28bc24fc 1458 vc->state.y = max_y - 1;
1da177e4 1459 else
28bc24fc
JS		 1460 vc->state.y = new_y;
1461 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1462 (vc->state.x << 1);
1da177e4
LT		 1463 vc->vc_need_wrap = 0;
1464}
1465
1466/* for absolute user moves, when decom is set */
1467static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1468{
1469 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1470}
1471
1b0ec88a 1472void scrollback(struct vc_data *vc)
1da177e4 1473{
1b0ec88a 1474 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1475}
1476
1477void scrollfront(struct vc_data *vc, int lines)
1478{
1479 if (!lines)
1480 lines = vc->vc_rows / 2;
1481 scrolldelta(lines);
1482}
1483
1484static void lf(struct vc_data *vc)
1485{
1486 /* don't scroll if above bottom of scrolling region, or
1487 * if below scrolling region
1488 */
28bc24fc 1489 if (vc->state.y + 1 == vc->vc_bottom)
89765b94 1490 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
28bc24fc
JS		 1491 else if (vc->state.y < vc->vc_rows - 1) {
1492 vc->state.y++;
1da177e4
LT		 1493 vc->vc_pos += vc->vc_size_row;
1494 }
1495 vc->vc_need_wrap = 0;
b293d758 1496 notify_write(vc, '\n');
1da177e4
LT		 1497}
1498
1499static void ri(struct vc_data *vc)
1500{
1501 /* don't scroll if below top of scrolling region, or
1502 * if above scrolling region
1503 */
28bc24fc 1504 if (vc->state.y == vc->vc_top)
89765b94 1505 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
28bc24fc
JS		 1506 else if (vc->state.y > 0) {
1507 vc->state.y--;
1da177e4
LT		 1508 vc->vc_pos -= vc->vc_size_row;
1509 }
1510 vc->vc_need_wrap = 0;
1511}
1512
1513static inline void cr(struct vc_data *vc)
1514{
28bc24fc
JS		 1515 vc->vc_pos -= vc->state.x << 1;
1516 vc->vc_need_wrap = vc->state.x = 0;
b293d758 1517 notify_write(vc, '\r');
1da177e4
LT		 1518}
1519
1520static inline void bs(struct vc_data *vc)
1521{
28bc24fc 1522 if (vc->state.x) {
1da177e4 1523 vc->vc_pos -= 2;
28bc24fc 1524 vc->state.x--;
1da177e4 1525 vc->vc_need_wrap = 0;
b293d758 1526 notify_write(vc, '\b');
1da177e4
LT		 1527 }
1528}
1529
1530static inline void del(struct vc_data *vc)
1531{
1532 /* ignored */
1533}
1534
1535static void csi_J(struct vc_data *vc, int vpar)
1536{
1537 unsigned int count;
1538 unsigned short * start;
1539
1540 switch (vpar) {
1541 case 0: /* erase from cursor to end of display */
28bc24fc
JS		 1542 vc_uniscr_clear_line(vc, vc->state.x,
1543 vc->vc_cols - vc->state.x);
1544 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1545 vc->vc_rows - vc->state.y - 1);
1da177e4
LT		 1546 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1547 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1548 break;
1549 case 1: /* erase from start to cursor */
28bc24fc
JS		 1550 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1551 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1da177e4
LT		 1552 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1553 start = (unsigned short *)vc->vc_origin;
1da177e4 1554 break;
a6dbe442
NP		 1555 case 3: /* include scrollback */
1556 flush_scrollback(vc);
1557 /* fallthrough */
1da177e4 1558 case 2: /* erase whole display */
d8ae7242 1559 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1560 count = vc->vc_cols * vc->vc_rows;
1561 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1562 break;
1563 default:
1564 return;
1565 }
1566 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
b2ecf006
MP		 1567 if (con_should_update(vc))
1568 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1569 vc->vc_need_wrap = 0;
1570}
1571
1572static void csi_K(struct vc_data *vc, int vpar)
1573{
1574 unsigned int count;
d8ae7242
NP		 1575 unsigned short *start = (unsigned short *)vc->vc_pos;
1576 int offset;
1da177e4
LT		 1577
1578 switch (vpar) {
1579 case 0: /* erase from cursor to end of line */
d8ae7242 1580 offset = 0;
28bc24fc 1581 count = vc->vc_cols - vc->state.x;
1da177e4
LT		 1582 break;
1583 case 1: /* erase from start of line to cursor */
28bc24fc
JS		 1584 offset = -vc->state.x;
1585 count = vc->state.x + 1;
1da177e4
LT		 1586 break;
1587 case 2: /* erase whole line */
28bc24fc 1588 offset = -vc->state.x;
1da177e4 1589 count = vc->vc_cols;
1da177e4
LT		 1590 break;
1591 default:
1592 return;
1593 }
28bc24fc 1594 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
d8ae7242 1595 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1596 vc->vc_need_wrap = 0;
6ca8dfd7 1597 if (con_should_update(vc))
943210ba 1598 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1599}
1600
e8548296
JS		 1601/* erase the following vpar positions */
1602static void csi_X(struct vc_data *vc, unsigned int vpar)
1da177e4 1603{ /* not vt100? */
e8548296 1604 unsigned int count;
1da177e4
LT		 1605
1606 if (!vpar)
1607 vpar++;
e8548296
JS		 1608
1609 count = min(vpar, vc->vc_cols - vc->state.x);
1da177e4 1610
28bc24fc 1611 vc_uniscr_clear_line(vc, vc->state.x, count);
1da177e4 1612 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1613 if (con_should_update(vc))
28bc24fc 1614 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1da177e4
LT		 1615 vc->vc_need_wrap = 0;
1616}
1617
1618static void default_attr(struct vc_data *vc)
1619{
b84ae3dc 1620 vc->state.intensity = VCI_NORMAL;
77bc14f2
JS		 1621 vc->state.italic = false;
1622 vc->state.underline = false;
1623 vc->state.reverse = false;
1624 vc->state.blink = false;
28bc24fc 1625 vc->state.color = vc->vc_def_color;
1da177e4
LT		 1626}
1627
cec5b2a9
AB		 1628struct rgb { u8 r; u8 g; u8 b; };
1629
0f91e142 1630static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1631{
cec5b2a9 1632 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1633 c->r = i&1 ? 0xaa : 0x00;
1634 c->g = i&2 ? 0xaa : 0x00;
1635 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1636 } else if (i < 16) {
0f91e142
JS		 1637 c->r = i&1 ? 0xff : 0x55;
1638 c->g = i&2 ? 0xff : 0x55;
1639 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1640 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1641 c->r = (i - 16) / 36 * 85 / 2;
1642 c->g = (i - 16) / 6 % 6 * 85 / 2;
1643 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1644 } else /* Grayscale ramp. */
0f91e142 1645 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1646}
1647
0f91e142 1648static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1649{
193df022
JS		 1650 u8 hue = 0, max = max3(c->r, c->g, c->b);
1651
1652 if (c->r > max / 2)
1653 hue |= 4;
1654 if (c->g > max / 2)
1655 hue |= 2;
1656 if (c->b > max / 2)
1657 hue |= 1;
1658
1659 if (hue == 7 && max <= 0x55) {
1660 hue = 0;
b84ae3dc 1661 vc->state.intensity = VCI_BOLD;
193df022 1662 } else if (max > 0xaa)
b84ae3dc 1663 vc->state.intensity = VCI_BOLD;
cec5b2a9 1664 else
b84ae3dc 1665 vc->state.intensity = VCI_NORMAL;
193df022 1666
28bc24fc 1667 vc->state.color = (vc->state.color & 0xf0) | hue;
cec5b2a9
AB		 1668}
1669
0f91e142 1670static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1671{
1672 /* For backgrounds, err on the dark side. */
28bc24fc 1673 vc->state.color = (vc->state.color & 0x0f)
0f91e142 1674 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1675}
1676
e05ab238
JS		 1677/*
1678 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1679 * and thus need to be detected and ignored by hand. That standard also
1680 * wants : rather than ; as separators but sequences containing : are currently
1681 * completely ignored by the parser.
e05ab238
JS		 1682 *
1683 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1684 * supporting them.
1685 */
1686static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1687 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1688{
0f91e142
JS		 1689 struct rgb c;
1690
e05ab238
JS		 1691 i++;
1692 if (i > vc->vc_npar)
1693 return i;
1694
0bf1f4a8 1695 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1696 /* 256 colours */
e05ab238 1697 i++;
0f91e142 1698 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1699 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1700 /* 24 bit */
0f91e142
JS		 1701 c.r = vc->vc_par[i + 1];
1702 c.g = vc->vc_par[i + 2];
1703 c.b = vc->vc_par[i + 3];
e05ab238 1704 i += 3;
0f91e142
JS		 1705 } else
1706 return i;
1707
1708 set_color(vc, &c);
e05ab238
JS		 1709
1710 return i;
1711}
1712
ac751efa 1713/* console_lock is held */
1da177e4
LT		 1714static void csi_m(struct vc_data *vc)
1715{
1716 int i;
1717
1718 for (i = 0; i <= vc->vc_npar; i++)
1719 switch (vc->vc_par[i]) {
aada0a34
JS		 1720 case 0: /* all attributes off */
1721 default_attr(vc);
1722 break;
1723 case 1:
b84ae3dc 1724 vc->state.intensity = VCI_BOLD;
aada0a34
JS		 1725 break;
1726 case 2:
b84ae3dc 1727 vc->state.intensity = VCI_HALF_BRIGHT;
aada0a34
JS		 1728 break;
1729 case 3:
77bc14f2 1730 vc->state.italic = true;
aada0a34 1731 break;
65d9982d
MF		 1732 case 21:
1733 /*
1734 * No console drivers support double underline, so
1735 * convert it to a single underline.
1736 */
aada0a34 1737 case 4:
77bc14f2 1738 vc->state.underline = true;
aada0a34
JS		 1739 break;
1740 case 5:
77bc14f2 1741 vc->state.blink = true;
aada0a34
JS		 1742 break;
1743 case 7:
77bc14f2 1744 vc->state.reverse = true;
aada0a34
JS		 1745 break;
1746 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1747 * Select primary font, don't display control chars if
1748 * defined, don't set bit 8 on output.
1749 */
b70ec4d9 1750 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
aada0a34
JS		 1751 vc->vc_disp_ctrl = 0;
1752 vc->vc_toggle_meta = 0;
1753 break;
1754 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1755 * Select first alternate font, lets chars < 32 be
1756 * displayed as ROM chars.
1757 */
1758 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1759 vc->vc_disp_ctrl = 1;
1760 vc->vc_toggle_meta = 0;
1761 break;
1762 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1763 * Select second alternate font, toggle high bit
1764 * before displaying as ROM char.
1765 */
1766 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1767 vc->vc_disp_ctrl = 1;
1768 vc->vc_toggle_meta = 1;
1769 break;
aada0a34 1770 case 22:
b84ae3dc 1771 vc->state.intensity = VCI_NORMAL;
aada0a34
JS		 1772 break;
1773 case 23:
77bc14f2 1774 vc->state.italic = false;
aada0a34
JS		 1775 break;
1776 case 24:
77bc14f2 1777 vc->state.underline = false;
aada0a34
JS		 1778 break;
1779 case 25:
77bc14f2 1780 vc->state.blink = false;
aada0a34
JS		 1781 break;
1782 case 27:
77bc14f2 1783 vc->state.reverse = false;
aada0a34
JS		 1784 break;
1785 case 38:
1786 i = vc_t416_color(vc, i, rgb_foreground);
1787 break;
1788 case 48:
1789 i = vc_t416_color(vc, i, rgb_background);
1790 break;
1791 case 39:
28bc24fc
JS		 1792 vc->state.color = (vc->vc_def_color & 0x0f) |
1793 (vc->state.color & 0xf0);
aada0a34
JS		 1794 break;
1795 case 49:
28bc24fc
JS		 1796 vc->state.color = (vc->vc_def_color & 0xf0) |
1797 (vc->state.color & 0x0f);
aada0a34
JS		 1798 break;
1799 default:
fadb4244
AB		 1800 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1801 if (vc->vc_par[i] < 100)
b84ae3dc 1802 vc->state.intensity = VCI_BOLD;
cc67dc28
AB		 1803 vc->vc_par[i] -= 60;
1804 }
aada0a34 1805 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
28bc24fc
JS		 1806 vc->state.color = color_table[vc->vc_par[i] - 30]
1807 | (vc->state.color & 0xf0);
aada0a34 1808 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
28bc24fc
JS		 1809 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1810 | (vc->state.color & 0x0f);
aada0a34 1811 break;
1da177e4
LT		 1812 }
1813 update_attr(vc);
1814}
1815
de53ce04 1816static void respond_string(const char *p, size_t len, struct tty_port *port)
1da177e4 1817{
de53ce04 1818 tty_insert_flip_string(port, p, len);
6732c8bb 1819 tty_schedule_flip(port);
1da177e4
LT		 1820}
1821
1822static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1823{
1824 char buf[40];
de53ce04 1825 int len;
1da177e4 1826
de53ce04
JS		 1827 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1828 (vc->vc_decom ? vc->vc_top + 1 : 1),
1829 vc->state.x + 1);
1830 respond_string(buf, len, tty->port);
1da177e4
LT		 1831}
1832
1833static inline void status_report(struct tty_struct *tty)
1834{
de53ce04
JS		 1835 static const char teminal_ok[] = "\033[0n";
1836
1837 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1da177e4
LT		 1838}
1839
6732c8bb 1840static inline void respond_ID(struct tty_struct *tty)
1da177e4 1841{
9a6f72d9
JS		 1842 /* terminal answer to an ESC-Z or csi0c query. */
1843 static const char vt102_id[] = "\033[?6c";
1844
1845 respond_string(vt102_id, strlen(vt102_id), tty->port);
1da177e4
LT		 1846}
1847
1848void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1849{
1850 char buf[8];
de53ce04 1851 int len;
1da177e4 1852
de53ce04
JS		 1853 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1854 (char)('!' + mrx), (char)('!' + mry));
1855 respond_string(buf, len, tty->port);
1da177e4
LT		 1856}
1857
496124e5 1858/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1da177e4
LT		 1859int mouse_reporting(void)
1860{
1861 return vc_cons[fg_console].d->vc_report_mouse;
1862}
1863
ac751efa 1864/* console_lock is held */
1da177e4
LT		 1865static void set_mode(struct vc_data *vc, int on_off)
1866{
1867 int i;
1868
1869 for (i = 0; i <= vc->vc_npar; i++)
2ff5c5a1 1870 if (vc->vc_priv == EPdec) {
1da177e4
LT		 1871 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1872 case 1: /* Cursor keys send ^[Ox/^[[x */
1873 if (on_off)
1874 set_kbd(vc, decckm);
1875 else
1876 clr_kbd(vc, decckm);
1877 break;
1878 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1879#if 0
1880 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1881 /* this alone does not suffice; some user mode
1882 utility has to change the hardware regs */
1883#endif
1884 break;
1885 case 5: /* Inverted screen on/off */
1886 if (vc->vc_decscnm != on_off) {
1887 vc->vc_decscnm = on_off;
1888 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1889 update_attr(vc);
1890 }
1891 break;
1892 case 6: /* Origin relative/absolute */
1893 vc->vc_decom = on_off;
1894 gotoxay(vc, 0, 0);
1895 break;
1896 case 7: /* Autowrap on/off */
1897 vc->vc_decawm = on_off;
1898 break;
1899 case 8: /* Autorepeat on/off */
1900 if (on_off)
1901 set_kbd(vc, decarm);
1902 else
1903 clr_kbd(vc, decarm);
1904 break;
1905 case 9:
1906 vc->vc_report_mouse = on_off ? 1 : 0;
1907 break;
1908 case 25: /* Cursor on/off */
1909 vc->vc_deccm = on_off;
1910 break;
1911 case 1000:
1912 vc->vc_report_mouse = on_off ? 2 : 0;
1913 break;
1914 }
1915 } else {
1916 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1917 case 3: /* Monitor (display ctrls) */
1918 vc->vc_disp_ctrl = on_off;
1919 break;
1920 case 4: /* Insert Mode on/off */
1921 vc->vc_decim = on_off;
1922 break;
1923 case 20: /* Lf, Enter == CrLf/Lf */
1924 if (on_off)
1925 set_kbd(vc, lnm);
1926 else
1927 clr_kbd(vc, lnm);
1928 break;
1929 }
1930 }
1931}
1932
ac751efa 1933/* console_lock is held */
1da177e4
LT		 1934static void setterm_command(struct vc_data *vc)
1935{
c3a834e8
JS		 1936 switch (vc->vc_par[0]) {
1937 case 1: /* set color for underline mode */
1938 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1939 vc->vc_ulcolor = color_table[vc->vc_par[1]];
28bc24fc 1940 if (vc->state.underline)
c3a834e8
JS		 1941 update_attr(vc);
1942 }
1943 break;
1944 case 2: /* set color for half intensity mode */
1945 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1946 vc->vc_halfcolor = color_table[vc->vc_par[1]];
b84ae3dc 1947 if (vc->state.intensity == VCI_HALF_BRIGHT)
c3a834e8
JS		 1948 update_attr(vc);
1949 }
1950 break;
1951 case 8: /* store colors as defaults */
1952 vc->vc_def_color = vc->vc_attr;
1953 if (vc->vc_hi_font_mask == 0x100)
1954 vc->vc_def_color >>= 1;
1955 default_attr(vc);
1956 update_attr(vc);
1957 break;
1958 case 9: /* set blanking interval */
1959 blankinterval = min(vc->vc_par[1], 60U) * 60;
1960 poke_blanked_console();
1961 break;
1962 case 10: /* set bell frequency in Hz */
1963 if (vc->vc_npar >= 1)
1964 vc->vc_bell_pitch = vc->vc_par[1];
1965 else
1966 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1967 break;
1968 case 11: /* set bell duration in msec */
1969 if (vc->vc_npar >= 1)
1970 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1971 msecs_to_jiffies(vc->vc_par[1]) : 0;
1972 else
1973 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1974 break;
1975 case 12: /* bring specified console to the front */
1976 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1977 set_console(vc->vc_par[1] - 1);
1978 break;
1979 case 13: /* unblank the screen */
1980 poke_blanked_console();
1981 break;
1982 case 14: /* set vesa powerdown interval */
1983 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1984 break;
1985 case 15: /* activate the previous console */
1986 set_console(last_console);
1987 break;
1988 case 16: /* set cursor blink duration in msec */
1989 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1990 vc->vc_par[1] <= USHRT_MAX)
1991 vc->vc_cur_blink_ms = vc->vc_par[1];
1992 else
1993 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1994 break;
1da177e4
LT		 1995 }
1996}
1997
ac751efa 1998/* console_lock is held */
1da177e4
LT		 1999static void csi_at(struct vc_data *vc, unsigned int nr)
2000{
28bc24fc
JS		 2001 if (nr > vc->vc_cols - vc->state.x)
2002 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 2003 else if (!nr)
2004 nr = 1;
2005 insert_char(vc, nr);
2006}
2007
ac751efa 2008/* console_lock is held */
1da177e4
LT		 2009static void csi_L(struct vc_data *vc, unsigned int nr)
2010{
28bc24fc
JS		 2011 if (nr > vc->vc_rows - vc->state.y)
2012 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 2013 else if (!nr)
2014 nr = 1;
28bc24fc 2015 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 2016 vc->vc_need_wrap = 0;
2017}
2018
ac751efa 2019/* console_lock is held */
1da177e4
LT		 2020static void csi_P(struct vc_data *vc, unsigned int nr)
2021{
28bc24fc
JS		 2022 if (nr > vc->vc_cols - vc->state.x)
2023 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 2024 else if (!nr)
2025 nr = 1;
2026 delete_char(vc, nr);
2027}
2028
ac751efa 2029/* console_lock is held */
1da177e4
LT		 2030static void csi_M(struct vc_data *vc, unsigned int nr)
2031{
28bc24fc
JS		 2032 if (nr > vc->vc_rows - vc->state.y)
2033 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 2034 else if (!nr)
2035 nr=1;
28bc24fc 2036 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 2037 vc->vc_need_wrap = 0;
2038}
2039
ac751efa 2040/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 2041static void save_cur(struct vc_data *vc)
2042{
28bc24fc 2043 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
1da177e4
LT		 2044}
2045
ac751efa 2046/* console_lock is held */
1da177e4
LT		 2047static void restore_cur(struct vc_data *vc)
2048{
28bc24fc
JS		 2049 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2050
2051 gotoxy(vc, vc->state.x, vc->state.y);
b70ec4d9
JS		 2052 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2053 vc);
1da177e4
LT		 2054 update_attr(vc);
2055 vc->vc_need_wrap = 0;
2056}
2057
b290af68 2058enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
7a99565f 2059 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
63f3a16d 2060 ESpalette, ESosc };
1da177e4 2061
ac751efa 2062/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2063static void reset_terminal(struct vc_data *vc, int do_clear)
2064{
dbee4cff
JS		 2065 unsigned int i;
2066
1da177e4
LT		 2067 vc->vc_top = 0;
2068 vc->vc_bottom = vc->vc_rows;
2069 vc->vc_state = ESnormal;
2ff5c5a1 2070 vc->vc_priv = EPecma;
1da177e4 2071 vc->vc_translate = set_translate(LAT1_MAP, vc);
b70ec4d9
JS		 2072 vc->state.Gx_charset[0] = LAT1_MAP;
2073 vc->state.Gx_charset[1] = GRAF_MAP;
28bc24fc 2074 vc->state.charset = 0;
1da177e4
LT		 2075 vc->vc_need_wrap = 0;
2076 vc->vc_report_mouse = 0;
042f10ec 2077 vc->vc_utf = default_utf8;
1da177e4
LT		 2078 vc->vc_utf_count = 0;
2079
2080 vc->vc_disp_ctrl = 0;
2081 vc->vc_toggle_meta = 0;
2082
2083 vc->vc_decscnm = 0;
2084 vc->vc_decom = 0;
2085 vc->vc_decawm = 1;
f6c06b68 2086 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2087 vc->vc_decim = 0;
2088
079c9534 2089 vt_reset_keyboard(vc->vc_num);
1da177e4 2090
9ea9a886 2091 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2092 vc->vc_complement_mask = vc->vc_s_complement_mask;
2093
2094 default_attr(vc);
2095 update_attr(vc);
2096
dbee4cff
JS		 2097 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2098 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2099 set_bit(i, vc->vc_tab_stop);
1da177e4
LT		 2100
2101 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2102 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2103 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2104
2105 gotoxy(vc, 0, 0);
2106 save_cur(vc);
2107 if (do_clear)
2108 csi_J(vc, 2);
2109}
2110
b4d92b65
JS		 2111static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2112{
b70ec4d9 2113 unsigned char *charset = &vc->state.Gx_charset[which];
b4d92b65
JS		 2114
2115 switch (c) {
2116 case '0':
2117 *charset = GRAF_MAP;
2118 break;
2119 case 'B':
2120 *charset = LAT1_MAP;
2121 break;
2122 case 'U':
2123 *charset = IBMPC_MAP;
2124 break;
2125 case 'K':
2126 *charset = USER_MAP;
2127 break;
2128 }
2129
2130 if (vc->state.charset == which)
2131 vc->vc_translate = set_translate(*charset, vc);
2132}
2133
ac751efa 2134/* console_lock is held */
1da177e4
LT		 2135static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2136{
2137 /*
2138 * Control characters can be used in the _middle_
2139 * of an escape sequence.
2140 */
63f3a16d
AB		 2141 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2142 return;
1da177e4
LT		 2143 switch (c) {
2144 case 0:
2145 return;
2146 case 7:
63f3a16d
AB		 2147 if (vc->vc_state == ESosc)
2148 vc->vc_state = ESnormal;
2149 else if (vc->vc_bell_duration)
1da177e4
LT		 2150 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2151 return;
2152 case 8:
2153 bs(vc);
2154 return;
2155 case 9:
28bc24fc 2156 vc->vc_pos -= (vc->state.x << 1);
dbee4cff
JS		 2157
2158 vc->state.x = find_next_bit(vc->vc_tab_stop,
2159 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2160 vc->state.x + 1);
2161 if (vc->state.x >= VC_TABSTOPS_COUNT)
2162 vc->state.x = vc->vc_cols - 1;
2163
28bc24fc 2164 vc->vc_pos += (vc->state.x << 1);
b293d758 2165 notify_write(vc, '\t');
1da177e4
LT		 2166 return;
2167 case 10: case 11: case 12:
2168 lf(vc);
2169 if (!is_kbd(vc, lnm))
2170 return;
17504fd7 2171 /* fall through */
1da177e4
LT		 2172 case 13:
2173 cr(vc);
2174 return;
2175 case 14:
28bc24fc 2176 vc->state.charset = 1;
b70ec4d9 2177 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
1da177e4
LT		 2178 vc->vc_disp_ctrl = 1;
2179 return;
2180 case 15:
28bc24fc 2181 vc->state.charset = 0;
b70ec4d9 2182 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
1da177e4
LT		 2183 vc->vc_disp_ctrl = 0;
2184 return;
2185 case 24: case 26:
2186 vc->vc_state = ESnormal;
2187 return;
2188 case 27:
2189 vc->vc_state = ESesc;
2190 return;
2191 case 127:
2192 del(vc);
2193 return;
2194 case 128+27:
2195 vc->vc_state = ESsquare;
2196 return;
2197 }
2198 switch(vc->vc_state) {
2199 case ESesc:
2200 vc->vc_state = ESnormal;
2201 switch (c) {
2202 case '[':
2203 vc->vc_state = ESsquare;
2204 return;
2205 case ']':
2206 vc->vc_state = ESnonstd;
2207 return;
2208 case '%':
2209 vc->vc_state = ESpercent;
2210 return;
2211 case 'E':
2212 cr(vc);
2213 lf(vc);
2214 return;
2215 case 'M':
2216 ri(vc);
2217 return;
2218 case 'D':
2219 lf(vc);
2220 return;
2221 case 'H':
dbee4cff
JS		 2222 if (vc->state.x < VC_TABSTOPS_COUNT)
2223 set_bit(vc->state.x, vc->vc_tab_stop);
1da177e4
LT		 2224 return;
2225 case 'Z':
2226 respond_ID(tty);
2227 return;
2228 case '7':
2229 save_cur(vc);
2230 return;
2231 case '8':
2232 restore_cur(vc);
2233 return;
2234 case '(':
2235 vc->vc_state = ESsetG0;
2236 return;
2237 case ')':
2238 vc->vc_state = ESsetG1;
2239 return;
2240 case '#':
2241 vc->vc_state = EShash;
2242 return;
2243 case 'c':
2244 reset_terminal(vc, 1);
2245 return;
2246 case '>': /* Numeric keypad */
2247 clr_kbd(vc, kbdapplic);
2248 return;
2249 case '=': /* Appl. keypad */
2250 set_kbd(vc, kbdapplic);
2251 return;
2252 }
2253 return;
2254 case ESnonstd:
2255 if (c=='P') { /* palette escape sequence */
2256 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2257 vc->vc_par[vc->vc_npar] = 0;
2258 vc->vc_npar = 0;
2259 vc->vc_state = ESpalette;
2260 return;
2261 } else if (c=='R') { /* reset palette */
2262 reset_palette(vc);
2263 vc->vc_state = ESnormal;
63f3a16d
AB		 2264 } else if (c>='0' && c<='9')
2265 vc->vc_state = ESosc;
2266 else
1da177e4
LT		 2267 vc->vc_state = ESnormal;
2268 return;
2269 case ESpalette:
74c807ce
AS		 2270 if (isxdigit(c)) {
2271 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2272 if (vc->vc_npar == 7) {
2273 int i = vc->vc_par[0] * 3, j = 1;
2274 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2275 vc->vc_palette[i++] += vc->vc_par[j++];
2276 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2277 vc->vc_palette[i++] += vc->vc_par[j++];
2278 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2279 vc->vc_palette[i] += vc->vc_par[j];
2280 set_palette(vc);
2281 vc->vc_state = ESnormal;
2282 }
2283 } else
2284 vc->vc_state = ESnormal;
2285 return;
2286 case ESsquare:
2287 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2288 vc->vc_par[vc->vc_npar] = 0;
2289 vc->vc_npar = 0;
2290 vc->vc_state = ESgetpars;
2291 if (c == '[') { /* Function key */
2292 vc->vc_state=ESfunckey;
2293 return;
2294 }
5445447b
MH		 2295 switch (c) {
2296 case '?':
2297 vc->vc_priv = EPdec;
2298 return;
2299 case '>':
2300 vc->vc_priv = EPgt;
2301 return;
2302 case '=':
2303 vc->vc_priv = EPeq;
1da177e4 2304 return;
5445447b
MH		 2305 case '<':
2306 vc->vc_priv = EPlt;
2307 return;
2308 }
2309 vc->vc_priv = EPecma;
17504fd7 2310 /* fall through */
1da177e4
LT		 2311 case ESgetpars:
2312 if (c == ';' && vc->vc_npar < NPAR - 1) {
2313 vc->vc_npar++;
2314 return;
2315 } else if (c>='0' && c<='9') {
2316 vc->vc_par[vc->vc_npar] *= 10;
2317 vc->vc_par[vc->vc_npar] += c - '0';
2318 return;
b290af68 2319 }
04afcd3a 2320 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
7a99565f
MH		 2321 vc->vc_state = EScsiignore;
2322 return;
2323 }
1da177e4
LT		 2324 vc->vc_state = ESnormal;
2325 switch(c) {
2326 case 'h':
5445447b
MH		 2327 if (vc->vc_priv <= EPdec)
2328 set_mode(vc, 1);
1da177e4
LT		 2329 return;
2330 case 'l':
5445447b
MH		 2331 if (vc->vc_priv <= EPdec)
2332 set_mode(vc, 0);
1da177e4
LT		 2333 return;
2334 case 'c':
2ff5c5a1 2335 if (vc->vc_priv == EPdec) {
1da177e4 2336 if (vc->vc_par[0])
c0e4b3ad
JS		 2337 vc->vc_cursor_type =
2338 CUR_MAKE(vc->vc_par[0],
2339 vc->vc_par[1],
2340 vc->vc_par[2]);
1da177e4 2341 else
9ea9a886 2342 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2343 return;
2344 }
2345 break;
2346 case 'm':
2ff5c5a1 2347 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2348 clear_selection();
2349 if (vc->vc_par[0])
2350 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2351 else
2352 vc->vc_complement_mask = vc->vc_s_complement_mask;
2353 return;
2354 }
2355 break;
2356 case 'n':
2ff5c5a1 2357 if (vc->vc_priv == EPecma) {
1da177e4
LT		 2358 if (vc->vc_par[0] == 5)
2359 status_report(tty);
2360 else if (vc->vc_par[0] == 6)
2361 cursor_report(vc, tty);
2362 }
2363 return;
2364 }
2ff5c5a1
MH		 2365 if (vc->vc_priv != EPecma) {
2366 vc->vc_priv = EPecma;
1da177e4
LT		 2367 return;
2368 }
2369 switch(c) {
2370 case 'G': case '`':
2371 if (vc->vc_par[0])
2372 vc->vc_par[0]--;
28bc24fc 2373 gotoxy(vc, vc->vc_par[0], vc->state.y);
1da177e4
LT		 2374 return;
2375 case 'A':
2376 if (!vc->vc_par[0])
2377 vc->vc_par[0]++;
28bc24fc 2378 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2379 return;
2380 case 'B': case 'e':
2381 if (!vc->vc_par[0])
2382 vc->vc_par[0]++;
28bc24fc 2383 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2384 return;
2385 case 'C': case 'a':
2386 if (!vc->vc_par[0])
2387 vc->vc_par[0]++;
28bc24fc 2388 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
1da177e4
LT		 2389 return;
2390 case 'D':
2391 if (!vc->vc_par[0])
2392 vc->vc_par[0]++;
28bc24fc 2393 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
1da177e4
LT		 2394 return;
2395 case 'E':
2396 if (!vc->vc_par[0])
2397 vc->vc_par[0]++;
28bc24fc 2398 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2399 return;
2400 case 'F':
2401 if (!vc->vc_par[0])
2402 vc->vc_par[0]++;
28bc24fc 2403 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2404 return;
2405 case 'd':
2406 if (vc->vc_par[0])
2407 vc->vc_par[0]--;
28bc24fc 2408 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
1da177e4
LT		 2409 return;
2410 case 'H': case 'f':
2411 if (vc->vc_par[0])
2412 vc->vc_par[0]--;
2413 if (vc->vc_par[1])
2414 vc->vc_par[1]--;
2415 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2416 return;
2417 case 'J':
2418 csi_J(vc, vc->vc_par[0]);
2419 return;
2420 case 'K':
2421 csi_K(vc, vc->vc_par[0]);
2422 return;
2423 case 'L':
2424 csi_L(vc, vc->vc_par[0]);
2425 return;
2426 case 'M':
2427 csi_M(vc, vc->vc_par[0]);
2428 return;
2429 case 'P':
2430 csi_P(vc, vc->vc_par[0]);
2431 return;
2432 case 'c':
2433 if (!vc->vc_par[0])
2434 respond_ID(tty);
2435 return;
2436 case 'g':
dbee4cff
JS		 2437 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2438 set_bit(vc->state.x, vc->vc_tab_stop);
2439 else if (vc->vc_par[0] == 3)
2440 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
1da177e4
LT		 2441 return;
2442 case 'm':
2443 csi_m(vc);
2444 return;
2445 case 'q': /* DECLL - but only 3 leds */
2446 /* map 0,1,2,3 to 0,1,2,4 */
2447 if (vc->vc_par[0] < 4)
079c9534 2448 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2449 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2450 return;
2451 case 'r':
2452 if (!vc->vc_par[0])
2453 vc->vc_par[0]++;
2454 if (!vc->vc_par[1])
2455 vc->vc_par[1] = vc->vc_rows;
2456 /* Minimum allowed region is 2 lines */
2457 if (vc->vc_par[0] < vc->vc_par[1] &&
2458 vc->vc_par[1] <= vc->vc_rows) {
2459 vc->vc_top = vc->vc_par[0] - 1;
2460 vc->vc_bottom = vc->vc_par[1];
2461 gotoxay(vc, 0, 0);
2462 }
2463 return;
2464 case 's':
2465 save_cur(vc);
2466 return;
2467 case 'u':
2468 restore_cur(vc);
2469 return;
2470 case 'X':
2471 csi_X(vc, vc->vc_par[0]);
2472 return;
2473 case '@':
2474 csi_at(vc, vc->vc_par[0]);
2475 return;
2476 case ']': /* setterm functions */
2477 setterm_command(vc);
2478 return;
2479 }
2480 return;
7a99565f
MH		 2481 case EScsiignore:
2482 if (c >= 20 && c <= 0x3f)
2483 return;
2484 vc->vc_state = ESnormal;
2485 return;
1da177e4
LT		 2486 case ESpercent:
2487 vc->vc_state = ESnormal;
2488 switch (c) {
2489 case '@': /* defined in ISO 2022 */
2490 vc->vc_utf = 0;
2491 return;
2492 case 'G': /* prelim official escape code */
2493 case '8': /* retained for compatibility */
2494 vc->vc_utf = 1;
2495 return;
2496 }
2497 return;
2498 case ESfunckey:
2499 vc->vc_state = ESnormal;
2500 return;
2501 case EShash:
2502 vc->vc_state = ESnormal;
2503 if (c == '8') {
2504 /* DEC screen alignment test. kludge :-) */
2505 vc->vc_video_erase_char =
2506 (vc->vc_video_erase_char & 0xff00) | 'E';
2507 csi_J(vc, 2);
2508 vc->vc_video_erase_char =
2509 (vc->vc_video_erase_char & 0xff00) | ' ';
2510 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2511 }
2512 return;
2513 case ESsetG0:
b4d92b65 2514 vc_setGx(vc, 0, c);
1da177e4
LT		 2515 vc->vc_state = ESnormal;
2516 return;
2517 case ESsetG1:
b4d92b65 2518 vc_setGx(vc, 1, c);
1da177e4
LT		 2519 vc->vc_state = ESnormal;
2520 return;
63f3a16d
AB		 2521 case ESosc:
2522 return;
1da177e4
LT		 2523 default:
2524 vc->vc_state = ESnormal;
2525 }
2526}
2527
2f1a2ccb 2528/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2529 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
a6fdf0c7 2530 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2f1a2ccb
EK		 2531 */
2532struct interval {
2533 uint32_t first;
2534 uint32_t last;
2535};
2536
f0a8d84f 2537static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2538{
f0a8d84f
TM		 2539 uint32_t ucs = *(uint32_t *)key;
2540 struct interval e = *(struct interval *) elt;
2f1a2ccb 2541
f0a8d84f
TM		 2542 if (ucs > e.last)
2543 return 1;
2544 else if (ucs < e.first)
2545 return -1;
2f1a2ccb
EK		 2546 return 0;
2547}
2548
2549static int is_double_width(uint32_t ucs)
2550{
2551 static const struct interval double_width[] = {
2552 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2553 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2554 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2555 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2556 };
f0a8d84f
TM		 2557 if (ucs < double_width[0].first ||
2558 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2559 return 0;
2560
2561 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2562 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2563}
2564
917ae1a9
JS		 2565struct vc_draw_region {
2566 unsigned long from, to;
2567 int x;
2568};
2569
2570static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
d711ea8f 2571{
917ae1a9 2572 if (draw->x < 0)
d711ea8f
JS		 2573 return;
2574
917ae1a9
JS		 2575 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2576 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2577 draw->x);
2578 draw->x = -1;
d711ea8f
JS		 2579}
2580
a018180c
JS		 2581static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2582{
2583 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2584 if (vc->vc_toggle_meta)
2585 c |= 0x80;
2586
2587 return vc->vc_translate[c];
2588 }
2589
2590 return c;
2591}
2592
ede98d12
JS		 2593
2594/**
2595 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2596 * @c: the received character, or U+FFFD for invalid sequences.
2597 */
2598static inline int vc_sanitize_unicode(const int c)
2599{
2600 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2601 return 0xfffd;
2602
2603 return c;
2604}
2605
694d8a48
JS		 2606/**
2607 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2608 *
2609 * @vc_utf_char is the being-constructed unicode character.
2610 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2611 * @vc_npar is the number of continuation bytes arrived so far.
2612 */
2613static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2614{
2615 static const u32 utf8_length_changes[] = {
2616 0x0000007f, 0x000007ff, 0x0000ffff,
2617 0x001fffff, 0x03ffffff, 0x7fffffff
2618 };
2619
ede98d12 2620 /* Continuation byte received */
694d8a48 2621 if ((c & 0xc0) == 0x80) {
ede98d12
JS		 2622 /* Unexpected continuation byte? */
2623 if (!vc->vc_utf_count)
694d8a48 2624 return 0xfffd;
ede98d12
JS		 2625
2626 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2627 vc->vc_npar++;
2628 if (--vc->vc_utf_count)
2629 goto need_more_bytes;
2630
2631 /* Got a whole character */
2632 c = vc->vc_utf_char;
2633 /* Reject overlong sequences */
2634 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2635 c > utf8_length_changes[vc->vc_npar])
694d8a48 2636 return 0xfffd;
ede98d12
JS		 2637
2638 return vc_sanitize_unicode(c);
694d8a48 2639 }
ede98d12
JS		 2640
2641 /* Single ASCII byte or first byte of a sequence received */
2642 if (vc->vc_utf_count) {
2643 /* Continuation byte expected */
2644 *rescan = true;
2645 vc->vc_utf_count = 0;
694d8a48 2646 return 0xfffd;
ede98d12 2647 }
694d8a48 2648
ede98d12
JS		 2649 /* Nothing to do if an ASCII byte was received */
2650 if (c <= 0x7f)
2651 return c;
2652
2653 /* First byte of a multibyte sequence received */
2654 vc->vc_npar = 0;
2655 if ((c & 0xe0) == 0xc0) {
2656 vc->vc_utf_count = 1;
2657 vc->vc_utf_char = (c & 0x1f);
2658 } else if ((c & 0xf0) == 0xe0) {
2659 vc->vc_utf_count = 2;
2660 vc->vc_utf_char = (c & 0x0f);
2661 } else if ((c & 0xf8) == 0xf0) {
2662 vc->vc_utf_count = 3;
2663 vc->vc_utf_char = (c & 0x07);
2664 } else if ((c & 0xfc) == 0xf8) {
2665 vc->vc_utf_count = 4;
2666 vc->vc_utf_char = (c & 0x03);
2667 } else if ((c & 0xfe) == 0xfc) {
2668 vc->vc_utf_count = 5;
2669 vc->vc_utf_char = (c & 0x01);
2670 } else {
2671 /* 254 and 255 are invalid */
2672 return 0xfffd;
2673 }
2674
2675need_more_bytes:
2676 return -1;
694d8a48
JS		 2677}
2678
a4236348
JS		 2679static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2680{
2681 /* Do no translation at all in control states */
2682 if (vc->vc_state != ESnormal)
2683 return *c;
2684
2685 if (vc->vc_utf && !vc->vc_disp_ctrl)
2686 return *c = vc_translate_unicode(vc, *c, rescan);
2687
2688 /* no utf or alternate charset mode */
2689 return vc_translate_ascii(vc, *c);
2690}
2691
881c8783
JS		 2692static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2693{
2694 if (!vc->vc_can_do_color)
2695 return vc->vc_attr ^ 0x08;
2696
2697 if (vc->vc_hi_font_mask == 0x100)
2698 return (vc->vc_attr & 0x11) |
2699 ((vc->vc_attr & 0xe0) >> 4) |
2700 ((vc->vc_attr & 0x0e) << 4);
2701
2702 return (vc->vc_attr & 0x88) |
2703 ((vc->vc_attr & 0x70) >> 4) |
2704 ((vc->vc_attr & 0x07) << 4);
2705}
2706
754bda98
JS		 2707static bool vc_is_control(struct vc_data *vc, int tc, int c)
2708{
2709 /*
2710 * A bitmap for codes <32. A bit of 1 indicates that the code
2711 * corresponding to that bit number invokes some special action (such
2712 * as cursor movement) and should not be displayed as a glyph unless
2713 * the disp_ctrl mode is explicitly enabled.
2714 */
2715 static const u32 CTRL_ACTION = 0x0d00ff81;
2716 /* Cannot be overridden by disp_ctrl */
2717 static const u32 CTRL_ALWAYS = 0x0800f501;
2718
2719 if (vc->vc_state != ESnormal)
2720 return true;
2721
2722 if (!tc)
2723 return true;
2724
2725 /*
2726 * If the original code was a control character we only allow a glyph
2727 * to be displayed if the code is not normally used (such as for cursor
2728 * movement) or if the disp_ctrl mode has been explicitly enabled.
2729 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2730 * displayed as control characters, as the console would be pretty
2731 * useless without them; to display an arbitrary font position use the
2732 * direct-to-font zone in UTF-8 mode.
2733 */
2734 if (c < 32) {
2735 if (vc->vc_disp_ctrl)
2736 return CTRL_ALWAYS & BIT(c);
2737 else
2738 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2739 }
2740
2741 if (c == 127 && !vc->vc_disp_ctrl)
2742 return true;
2743
2744 if (c == 128 + 27)
2745 return true;
2746
2747 return false;
2748}
2749
391536ab
JS		 2750static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2751 struct vc_draw_region *draw)
2752{
2753 int next_c;
f3205b29 2754 unsigned char vc_attr = vc->vc_attr;
391536ab
JS		 2755 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2756 u8 width = 1;
2757 bool inverse = false;
2758
2759 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2760 if (is_double_width(c))
2761 width = 2;
2762 }
2763
2764 /* Now try to find out how to display it */
2765 tc = conv_uni_to_pc(vc, tc);
2766 if (tc & ~charmask) {
2767 if (tc == -1 || tc == -2)
2768 return -1; /* nothing to display */
2769
2770 /* Glyph not found */
6923e2d7 2771 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
391536ab
JS		 2772 !(c & ~charmask)) {
2773 /*
2774 * In legacy mode use the glyph we get by a 1:1
2775 * mapping.
2776 * This would make absolutely no sense with Unicode in
2777 * mind, but do this for ASCII characters since a font
2778 * may lack Unicode mapping info and we don't want to
2779 * end up with having question marks only.
2780 */
2781 tc = c;
2782 } else {
2783 /*
2784 * Display U+FFFD. If it's not found, display an inverse
2785 * question mark.
2786 */
2787 tc = conv_uni_to_pc(vc, 0xfffd);
2788 if (tc < 0) {
2789 inverse = true;
2790 tc = conv_uni_to_pc(vc, '?');
2791 if (tc < 0)
2792 tc = '?';
f3205b29
JS		 2793
2794 vc_attr = vc_invert_attr(vc);
2795 con_flush(vc, draw);
391536ab
JS		 2796 }
2797 }
2798 }
2799
391536ab
JS		 2800 next_c = c;
2801 while (1) {
2802 if (vc->vc_need_wrap || vc->vc_decim)
2803 con_flush(vc, draw);
2804 if (vc->vc_need_wrap) {
2805 cr(vc);
2806 lf(vc);
2807 }
2808 if (vc->vc_decim)
2809 insert_char(vc, 1);
2810 vc_uniscr_putc(vc, next_c);
f1bcbe14
JS		 2811
2812 if (himask)
2813 tc = ((tc & 0x100) ? himask : 0) |
2814 (tc & 0xff);
2815 tc |= (vc_attr << 8) & ~himask;
2816
2817 scr_writew(tc, (u16 *)vc->vc_pos);
2818
391536ab
JS		 2819 if (con_should_update(vc) && draw->x < 0) {
2820 draw->x = vc->state.x;
2821 draw->from = vc->vc_pos;
2822 }
2823 if (vc->state.x == vc->vc_cols - 1) {
2824 vc->vc_need_wrap = vc->vc_decawm;
2825 draw->to = vc->vc_pos + 2;
2826 } else {
2827 vc->state.x++;
2828 draw->to = (vc->vc_pos += 2);
2829 }
2830
2831 if (!--width)
2832 break;
2833
2834 /* A space is printed in the second column */
2835 tc = conv_uni_to_pc(vc, ' ');
2836 if (tc < 0)
2837 tc = ' ';
2838 next_c = ' ';
2839 }
2840 notify_write(vc, c);
2841
2842 if (inverse)
2843 con_flush(vc, draw);
2844
2845 return 0;
2846}
2847
ac751efa 2848/* acquires console_lock */
1da177e4
LT		 2849static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2850{
917ae1a9
JS		 2851 struct vc_draw_region draw = {
2852 .x = -1,
2853 };
391536ab 2854 int c, tc, n = 0;
1da177e4 2855 unsigned int currcons;
1da177e4 2856 struct vc_data *vc;
0341a4d0 2857 struct vt_notifier_param param;
da823b2d 2858 bool rescan;
1da177e4
LT		 2859
2860 if (in_interrupt())
2861 return count;
2862
ac751efa 2863 console_lock();
1da177e4
LT		 2864 vc = tty->driver_data;
2865 if (vc == NULL) {
bccf1da3 2866 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2867 console_unlock();
1da177e4
LT		 2868 return 0;
2869 }
2870
2871 currcons = vc->vc_num;
2872 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2873 /* could this happen? */
2874 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2875 console_unlock();
2876 return 0;
1da177e4 2877 }
1da177e4 2878
1da177e4
LT		 2879
2880 /* undraw cursor first */
6ca8dfd7 2881 if (con_is_fg(vc))
1da177e4
LT		 2882 hide_cursor(vc);
2883
0341a4d0
KD		 2884 param.vc = vc;
2885
1da177e4
LT		 2886 while (!tty->stopped && count) {
2887 int orig = *buf;
1da177e4
LT		 2888 buf++;
2889 n++;
2890 count--;
0d1ffef5
JS		 2891rescan_last_byte:
2892 c = orig;
da823b2d 2893 rescan = false;
1da177e4 2894
a4236348
JS		 2895 tc = vc_translate(vc, &c, &rescan);
2896 if (tc == -1)
2897 continue;
1da177e4 2898
0341a4d0
KD		 2899 param.c = tc;
2900 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2901 &param) == NOTIFY_STOP)
2902 continue;
2903
391536ab
JS		 2904 if (vc_is_control(vc, tc, c)) {
2905 con_flush(vc, &draw);
2906 do_con_trol(tty, vc, orig);
1da177e4
LT		 2907 continue;
2908 }
391536ab
JS		 2909
2910 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2911 continue;
2912
2913 if (rescan)
2914 goto rescan_last_byte;
1da177e4 2915 }
917ae1a9 2916 con_flush(vc, &draw);
0224080f 2917 vc_uniscr_debug_check(vc);
1da177e4 2918 console_conditional_schedule();
b293d758 2919 notify_update(vc);
7e1d2263 2920 console_unlock();
1da177e4 2921 return n;
1da177e4
LT		 2922}
2923
2924/*
2925 * This is the console switching callback.
2926 *
2927 * Doing console switching in a process context allows
2928 * us to do the switches asynchronously (needed when we want
2929 * to switch due to a keyboard interrupt). Synchronization
2930 * with other console code and prevention of re-entrancy is
ac751efa 2931 * ensured with console_lock.
1da177e4 2932 */
65f27f38 2933static void console_callback(struct work_struct *ignored)
1da177e4 2934{
ac751efa 2935 console_lock();
1da177e4
LT		 2936
2937 if (want_console >= 0) {
2938 if (want_console != fg_console &&
2939 vc_cons_allocated(want_console)) {
2940 hide_cursor(vc_cons[fg_console].d);
2941 change_console(vc_cons[want_console].d);
2942 /* we only changed when the console had already
2943 been allocated - a new console is not created
2944 in an interrupt routine */
2945 }
2946 want_console = -1;
2947 }
2948 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2949 do_poke_blanked_console = 0;
2950 poke_blanked_console();
2951 }
2952 if (scrollback_delta) {
2953 struct vc_data *vc = vc_cons[fg_console].d;
2954 clear_selection();
97293de9 2955 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2956 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2957 scrollback_delta = 0;
2958 }
2959 if (blank_timer_expired) {
2960 do_blank_screen(0);
2961 blank_timer_expired = 0;
2962 }
b293d758 2963 notify_update(vc_cons[fg_console].d);
1da177e4 2964
ac751efa 2965 console_unlock();
1da177e4
LT		 2966}
2967
b257bc05 2968int set_console(int nr)
1da177e4 2969{
b257bc05
AJ		 2970 struct vc_data *vc = vc_cons[fg_console].d;
2971
2972 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2973 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2974
2975 /*
2976 * Console switch will fail in console_callback() or
2977 * change_console() so there is no point scheduling
2978 * the callback
2979 *
2980 * Existing set_console() users don't check the return
2981 * value so this shouldn't break anything
2982 */
2983 return -EINVAL;
2984 }
2985
1da177e4
LT		 2986 want_console = nr;
2987 schedule_console_callback();
b257bc05
AJ		 2988
2989 return 0;
1da177e4
LT		 2990}
2991
2992struct tty_driver *console_driver;
2993
2994#ifdef CONFIG_VT_CONSOLE
2995
5ada918b
BW		 2996/**
2997 * vt_kmsg_redirect() - Sets/gets the kernel message console
2998 * @new: The new virtual terminal number or -1 if the console should stay
2999 * unchanged
3000 *
3001 * By default, the kernel messages are always printed on the current virtual
3002 * console. However, the user may modify that default with the
3003 * TIOCL_SETKMSGREDIRECT ioctl call.
3004 *
3005 * This function sets the kernel message console to be @new. It returns the old
3006 * virtual console number. The virtual terminal number 0 (both as parameter and
3007 * return value) means no redirection (i.e. always printed on the currently
3008 * active console).
3009 *
3010 * The parameter -1 means that only the current console is returned, but the
3011 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3012 * case to make the code more understandable.
3013 *
3014 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3015 * the parameter and always returns 0.
3016 */
3017int vt_kmsg_redirect(int new)
3018{
3019 static int kmsg_con;
3020
3021 if (new != -1)
3022 return xchg(&kmsg_con, new);
3023 else
3024 return kmsg_con;
3025}
3026
1da177e4
LT		 3027/*
3028 * Console on virtual terminal
3029 *
3030 * The console must be locked when we get here.
3031 */
3032
3033static void vt_console_print(struct console *co, const char *b, unsigned count)
3034{
3035 struct vc_data *vc = vc_cons[fg_console].d;
3036 unsigned char c;
b0940003 3037 static DEFINE_SPINLOCK(printing_lock);
1da177e4 3038 const ushort *start;
6609cff6 3039 ushort start_x, cnt;
5ada918b 3040 int kmsg_console;
1da177e4
LT		 3041
3042 /* console busy or not yet initialized */
b0940003
NP		 3043 if (!printable)
3044 return;
3045 if (!spin_trylock(&printing_lock))
1da177e4
LT		 3046 return;
3047
5ada918b
BW		 3048 kmsg_console = vt_get_kmsg_redirect();
3049 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3050 vc = vc_cons[kmsg_console - 1].d;
1da177e4 3051
1da177e4
LT		 3052 if (!vc_cons_allocated(fg_console)) {
3053 /* impossible */
3054 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3055 goto quit;
3056 }
3057
8d7fc299 3058 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 3059 goto quit;
3060
3061 /* undraw cursor first */
6ca8dfd7 3062 if (con_is_fg(vc))
1da177e4
LT		 3063 hide_cursor(vc);
3064
3065 start = (ushort *)vc->vc_pos;
28bc24fc 3066 start_x = vc->state.x;
6609cff6 3067 cnt = 0;
1da177e4
LT		 3068 while (count--) {
3069 c = *b++;
3070 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
6609cff6 3071 if (cnt && con_is_visible(vc))
28bc24fc 3072 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
6609cff6 3073 cnt = 0;
1da177e4
LT		 3074 if (c == 8) { /* backspace */
3075 bs(vc);
3076 start = (ushort *)vc->vc_pos;
28bc24fc 3077 start_x = vc->state.x;
1da177e4
LT		 3078 continue;
3079 }
3080 if (c != 13)
3081 lf(vc);
3082 cr(vc);
3083 start = (ushort *)vc->vc_pos;
28bc24fc 3084 start_x = vc->state.x;
1da177e4
LT		 3085 if (c == 10 || c == 13)
3086 continue;
3087 }
6609cff6 3088 vc_uniscr_putc(vc, c);
1da177e4 3089 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 3090 notify_write(vc, c);
1da177e4 3091 cnt++;
28bc24fc 3092 if (vc->state.x == vc->vc_cols - 1) {
1da177e4 3093 vc->vc_need_wrap = 1;
6609cff6
NP		 3094 } else {
3095 vc->vc_pos += 2;
28bc24fc 3096 vc->state.x++;
1da177e4
LT		 3097 }
3098 }
6609cff6 3099 if (cnt && con_is_visible(vc))
28bc24fc 3100 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
1da177e4 3101 set_cursor(vc);
b293d758 3102 notify_update(vc);
1da177e4
LT		 3103
3104quit:
b0940003 3105 spin_unlock(&printing_lock);
1da177e4
LT		 3106}
3107
3108static struct tty_driver *vt_console_device(struct console *c, int *index)
3109{
3110 *index = c->index ? c->index-1 : fg_console;
3111 return console_driver;
3112}
3113
3114static struct console vt_console_driver = {
3115 .name = "tty",
3116 .write = vt_console_print,
3117 .device = vt_console_device,
3118 .unblank = unblank_screen,
3119 .flags = CON_PRINTBUFFER,
3120 .index = -1,
3121};
3122#endif
3123
3124/*
3125 * Handling of Linux-specific VC ioctls
3126 */
3127
3128/*
ac751efa 3129 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3130 *
3131 * There are some functions which don't need it.
3132 *
3133 * There are some functions which can sleep for arbitrary periods
3134 * (paste_selection) but we don't need the lock there anyway.
3135 *
496124e5 3136 * set_selection_user has locking, and definitely needs it
1da177e4
LT		 3137 */
3138
3139int tioclinux(struct tty_struct *tty, unsigned long arg)
3140{
3141 char type, data;
3142 char __user *p = (char __user *)arg;
3143 int lines;
3144 int ret;
3145
1da177e4
LT		 3146 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3147 return -EPERM;
3148 if (get_user(type, p))
3149 return -EFAULT;
3150 ret = 0;
04f378b1 3151
1da177e4
LT		 3152 switch (type)
3153 {
3154 case TIOCL_SETSEL:
496124e5
OK		 3155 ret = set_selection_user((struct tiocl_selection
3156 __user *)(p+1), tty);
1da177e4
LT		 3157 break;
3158 case TIOCL_PASTESEL:
3159 ret = paste_selection(tty);
3160 break;
3161 case TIOCL_UNBLANKSCREEN:
ac751efa 3162 console_lock();
1da177e4 3163 unblank_screen();
ac751efa 3164 console_unlock();
1da177e4
LT		 3165 break;
3166 case TIOCL_SELLOADLUT:
5289475d 3167 console_lock();
1da177e4 3168 ret = sel_loadlut(p);
5289475d 3169 console_unlock();
1da177e4
LT		 3170 break;
3171 case TIOCL_GETSHIFTSTATE:
04f378b1 3172
1da177e4
LT		 3173 /*
3174 * Make it possible to react to Shift+Mousebutton.
3175 * Note that 'shift_state' is an undocumented
3176 * kernel-internal variable; programs not closely
3177 * related to the kernel should not use this.
3178 */
079c9534 3179 data = vt_get_shift_state();
6987dc8a 3180 ret = put_user(data, p);
1da177e4
LT		 3181 break;
3182 case TIOCL_GETMOUSEREPORTING:
20f62579 3183 console_lock(); /* May be overkill */
1da177e4 3184 data = mouse_reporting();
20f62579 3185 console_unlock();
6987dc8a 3186 ret = put_user(data, p);
1da177e4
LT		 3187 break;
3188 case TIOCL_SETVESABLANK:
20f62579 3189 console_lock();
403aac96 3190 ret = set_vesa_blanking(p);
20f62579 3191 console_unlock();
1da177e4 3192 break;
0ca07731 3193 case TIOCL_GETKMSGREDIRECT:
5ada918b 3194 data = vt_get_kmsg_redirect();
6987dc8a 3195 ret = put_user(data, p);
0ca07731 3196 break;
1da177e4
LT		 3197 case TIOCL_SETKMSGREDIRECT:
3198 if (!capable(CAP_SYS_ADMIN)) {
3199 ret = -EPERM;
3200 } else {
3201 if (get_user(data, p+1))
3202 ret = -EFAULT;
3203 else
5ada918b 3204 vt_kmsg_redirect(data);
1da177e4
LT		 3205 }
3206 break;
3207 case TIOCL_GETFGCONSOLE:
20f62579
AC		 3208 /* No locking needed as this is a transiently
3209 correct return anyway if the caller hasn't
3210 disabled switching */
1da177e4
LT		 3211 ret = fg_console;
3212 break;
3213 case TIOCL_SCROLLCONSOLE:
3214 if (get_user(lines, (s32 __user *)(p+4))) {
3215 ret = -EFAULT;
3216 } else {
20f62579
AC		 3217 /* Need the console lock here. Note that lots
3218 of other calls need fixing before the lock
3219 is actually useful ! */
3220 console_lock();
1da177e4 3221 scrollfront(vc_cons[fg_console].d, lines);
20f62579 3222 console_unlock();
1da177e4
LT		 3223 ret = 0;
3224 }
3225 break;
3226 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 3227 console_lock();
1da177e4
LT		 3228 ignore_poke = 1;
3229 do_blank_screen(0);
ac751efa 3230 console_unlock();
1da177e4
LT		 3231 break;
3232 case TIOCL_BLANKEDSCREEN:
3233 ret = console_blanked;
3234 break;
3235 default:
3236 ret = -EINVAL;
3237 break;
3238 }
3239 return ret;
3240}
3241
3242/*
3243 * /dev/ttyN handling
3244 */
3245
3246static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3247{
3248 int retval;
3249
3250 retval = do_con_write(tty, buf, count);
3251 con_flush_chars(tty);
3252
3253 return retval;
3254}
3255
5d19f546 3256static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 3257{
3258 if (in_interrupt())
5d19f546
AC		 3259 return 0; /* n_r3964 calls put_char() from interrupt context */
3260 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3261}
3262
3263static int con_write_room(struct tty_struct *tty)
3264{
3265 if (tty->stopped)
3266 return 0;
a88a69c9 3267 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3268}
3269
3270static int con_chars_in_buffer(struct tty_struct *tty)
3271{
3272 return 0; /* we're not buffering */
3273}
3274
3275/*
3276 * con_throttle and con_unthrottle are only used for
3277 * paste_selection(), which has to stuff in a large number of
3278 * characters...
3279 */
3280static void con_throttle(struct tty_struct *tty)
3281{
3282}
3283
3284static void con_unthrottle(struct tty_struct *tty)
3285{
3286 struct vc_data *vc = tty->driver_data;
3287
3288 wake_up_interruptible(&vc->paste_wait);
3289}
3290
3291/*
3292 * Turn the Scroll-Lock LED on when the tty is stopped
3293 */
3294static void con_stop(struct tty_struct *tty)
3295{
3296 int console_num;
3297 if (!tty)
3298 return;
3299 console_num = tty->index;
3300 if (!vc_cons_allocated(console_num))
3301 return;
079c9534 3302 vt_kbd_con_stop(console_num);
1da177e4
LT		 3303}
3304
3305/*
3306 * Turn the Scroll-Lock LED off when the console is started
3307 */
3308static void con_start(struct tty_struct *tty)
3309{
3310 int console_num;
3311 if (!tty)
3312 return;
3313 console_num = tty->index;
3314 if (!vc_cons_allocated(console_num))
3315 return;
079c9534 3316 vt_kbd_con_start(console_num);
1da177e4
LT		 3317}
3318
3319static void con_flush_chars(struct tty_struct *tty)
3320{
3321 struct vc_data *vc;
3322
3323 if (in_interrupt()) /* from flush_to_ldisc */
3324 return;
3325
3326 /* if we race with con_close(), vt may be null */
ac751efa 3327 console_lock();
1da177e4
LT		 3328 vc = tty->driver_data;
3329 if (vc)
3330 set_cursor(vc);
ac751efa 3331 console_unlock();
1da177e4
LT		 3332}
3333
3334/*
3335 * Allocate the console screen memory.
3336 */
bc1e99d9 3337static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3338{
3339 unsigned int currcons = tty->index;
bc1e99d9
JS		 3340 struct vc_data *vc;
3341 int ret;
1da177e4 3342
ac751efa 3343 console_lock();
bc1e99d9
JS		 3344 ret = vc_allocate(currcons);
3345 if (ret)
3346 goto unlock;
feebed65 3347
bc1e99d9 3348 vc = vc_cons[currcons].d;
1da177e4 3349
bc1e99d9
JS		 3350 /* Still being freed */
3351 if (vc->port.tty) {
3352 ret = -ERESTARTSYS;
3353 goto unlock;
3354 }
3355
3356 ret = tty_port_install(&vc->port, driver, tty);
3357 if (ret)
3358 goto unlock;
3359
3360 tty->driver_data = vc;
3361 vc->port.tty = tty;
ca4463bf 3362 tty_port_get(&vc->port);
bc1e99d9
JS		 3363
3364 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3365 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3366 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3367 }
bc1e99d9 3368 if (vc->vc_utf)
adc8d746 3369 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3370 else
adc8d746 3371 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3372unlock:
ac751efa 3373 console_unlock();
1da177e4
LT		 3374 return ret;
3375}
3376
bc1e99d9
JS		 3377static int con_open(struct tty_struct *tty, struct file *filp)
3378{
3379 /* everything done in install */
3380 return 0;
3381}
3382
3383
1da177e4
LT		 3384static void con_close(struct tty_struct *tty, struct file *filp)
3385{
feebed65
AC		 3386 /* Nothing to do - we defer to shutdown */
3387}
1da177e4 3388
feebed65
AC		 3389static void con_shutdown(struct tty_struct *tty)
3390{
3391 struct vc_data *vc = tty->driver_data;
3392 BUG_ON(vc == NULL);
ac751efa 3393 console_lock();
8ce73264 3394 vc->port.tty = NULL;
ac751efa 3395 console_unlock();
1da177e4
LT		 3396}
3397
ca4463bf
EB		 3398static void con_cleanup(struct tty_struct *tty)
3399{
3400 struct vc_data *vc = tty->driver_data;
3401
3402 tty_port_put(&vc->port);
3403}
3404
3855ae1c 3405static int default_color = 7; /* white */
fa6ce9ab
JE		 3406static int default_italic_color = 2; // green (ASCII)
3407static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3408module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3409module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3410module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3411
1da177e4
LT		 3412static void vc_init(struct vc_data *vc, unsigned int rows,
3413 unsigned int cols, int do_clear)
3414{
3415 int j, k ;
3416
3417 vc->vc_cols = cols;
3418 vc->vc_rows = rows;
3419 vc->vc_size_row = cols << 1;
3420 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3421
3422 set_origin(vc);
3423 vc->vc_pos = vc->vc_origin;
3424 reset_vc(vc);
3425 for (j=k=0; j<16; j++) {
3426 vc->vc_palette[k++] = default_red[j] ;
3427 vc->vc_palette[k++] = default_grn[j] ;
3428 vc->vc_palette[k++] = default_blu[j] ;
3429 }
3855ae1c 3430 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3431 vc->vc_ulcolor = default_underline_color;
3432 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3433 vc->vc_halfcolor = 0x08; /* grey */
3434 init_waitqueue_head(&vc->paste_wait);
3435 reset_terminal(vc, do_clear);
3436}
3437
3438/*
3439 * This routine initializes console interrupts, and does nothing
3440 * else. If you want the screen to clear, call tty_write with
3441 * the appropriate escape-sequence.
3442 */
3443
3444static int __init con_init(void)
3445{
3446 const char *display_desc = NULL;
3447 struct vc_data *vc;
3e795de7 3448 unsigned int currcons = 0, i;
1da177e4 3449
ac751efa 3450 console_lock();
1da177e4 3451
805ece2a
AS		 3452 if (!conswitchp)
3453 conswitchp = &dummy_con;
3454 display_desc = conswitchp->con_startup();
1da177e4
LT		 3455 if (!display_desc) {
3456 fg_console = 0;
ac751efa 3457 console_unlock();
1da177e4
LT		 3458 return 0;
3459 }
3460
3e795de7
AD		 3461 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3462 struct con_driver *con_driver = &registered_con_driver[i];
3463
3464 if (con_driver->con == NULL) {
3465 con_driver->con = conswitchp;
3466 con_driver->desc = display_desc;
3467 con_driver->flag = CON_DRIVER_FLAG_INIT;
3468 con_driver->first = 0;
3469 con_driver->last = MAX_NR_CONSOLES - 1;
3470 break;
3471 }
3472 }
3473
3474 for (i = 0; i < MAX_NR_CONSOLES; i++)
3475 con_driver_map[i] = conswitchp;
3476
1da177e4
LT		 3477 if (blankinterval) {
3478 blank_state = blank_normal_wait;
f324edc8 3479 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3480 }
3481
1da177e4 3482 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3483 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3484 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3485 tty_port_init(&vc->port);
1da177e4 3486 visual_init(vc, currcons, 1);
ce684552 3487 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
a5f4f52e 3488 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3489 vc_init(vc, vc->vc_rows, vc->vc_cols,
3490 currcons || !vc->vc_sw->con_save_screen);
3491 }
3492 currcons = fg_console = 0;
3493 master_display_fg = vc = vc_cons[currcons].d;
3494 set_origin(vc);
3495 save_screen(vc);
28bc24fc 3496 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 3497 csi_J(vc, 0);
3498 update_screen(vc);
5da527aa 3499 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3500 vc->vc_can_do_color ? "colour" : "mono",
3501 display_desc, vc->vc_cols, vc->vc_rows);
3502 printable = 1;
1da177e4 3503
ac751efa 3504 console_unlock();
1da177e4
LT		 3505
3506#ifdef CONFIG_VT_CONSOLE
3507 register_console(&vt_console_driver);
3508#endif
3509 return 0;
3510}
3511console_initcall(con_init);
3512
b68e31d0 3513static const struct tty_operations con_ops = {
bc1e99d9 3514 .install = con_install,
1da177e4
LT		 3515 .open = con_open,
3516 .close = con_close,
3517 .write = con_write,
3518 .write_room = con_write_room,
3519 .put_char = con_put_char,
3520 .flush_chars = con_flush_chars,
3521 .chars_in_buffer = con_chars_in_buffer,
3522 .ioctl = vt_ioctl,
e9216651
AB		 3523#ifdef CONFIG_COMPAT
3524 .compat_ioctl = vt_compat_ioctl,
3525#endif
1da177e4
LT		 3526 .stop = con_stop,
3527 .start = con_start,
3528 .throttle = con_throttle,
3529 .unthrottle = con_unthrottle,
8c9a9dd0 3530 .resize = vt_resize,
ca4463bf
EB		 3531 .shutdown = con_shutdown,
3532 .cleanup = con_cleanup,
1da177e4
LT		 3533};
3534
d81ed103
AC		 3535static struct cdev vc0_cdev;
3536
fbc92a34
KS		 3537static ssize_t show_tty_active(struct device *dev,
3538 struct device_attribute *attr, char *buf)
3539{
3540 return sprintf(buf, "tty%d\n", fg_console + 1);
3541}
3542static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3543
1083a7be
TI		 3544static struct attribute *vt_dev_attrs[] = {
3545 &dev_attr_active.attr,
3546 NULL
3547};
3548
3549ATTRIBUTE_GROUPS(vt_dev);
3550
d81ed103 3551int __init vty_init(const struct file_operations *console_fops)
1da177e4 3552{
d81ed103
AC		 3553 cdev_init(&vc0_cdev, console_fops);
3554 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3555 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3556 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3557 tty0dev = device_create_with_groups(tty_class, NULL,
3558 MKDEV(TTY_MAJOR, 0), NULL,
3559 vt_dev_groups, "tty0");
fbc92a34
KS		 3560 if (IS_ERR(tty0dev))
3561 tty0dev = NULL;
d81ed103 3562
1da177e4
LT		 3563 vcs_init();
3564
3565 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3566 if (!console_driver)
3567 panic("Couldn't allocate console driver\n");
2f16669d 3568
1da177e4
LT		 3569 console_driver->name = "tty";
3570 console_driver->name_base = 1;
3571 console_driver->major = TTY_MAJOR;
3572 console_driver->minor_start = 1;
3573 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3574 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3575 if (default_utf8)
3576 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3577 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3578 tty_set_operations(console_driver, &con_ops);
3579 if (tty_register_driver(console_driver))
3580 panic("Couldn't register console driver\n");
1da177e4
LT		 3581 kbd_init();
3582 console_map_init();
1da177e4
LT		 3583#ifdef CONFIG_MDA_CONSOLE
3584 mda_console_init();
3585#endif
3586 return 0;
3587}
3588
3589#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3590
3591static struct class *vtconsole_class;
3592
50e244cc 3593static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3594 int deflt)
1da177e4 3595{
3e795de7
AD		 3596 struct module *owner = csw->owner;
3597 const char *desc = NULL;
3598 struct con_driver *con_driver;
3599 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3600
1da177e4
LT		 3601 if (!try_module_get(owner))
3602 return -ENODEV;
3603
50e244cc 3604 WARN_CONSOLE_UNLOCKED();
1c8ce271 3605
3e795de7
AD		 3606 /* check if driver is registered */
3607 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3608 con_driver = &registered_con_driver[i];
3609
3610 if (con_driver->con == csw) {
3611 desc = con_driver->desc;
3612 retval = 0;
3613 break;
3614 }
3615 }
3616
3617 if (retval)
3618 goto err;
3619
3620 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3621 csw->con_startup();
3622 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3623 }
1c8ce271 3624
1da177e4
LT		 3625 if (deflt) {
3626 if (conswitchp)
3627 module_put(conswitchp->owner);
1c8ce271 3628
1da177e4
LT		 3629 __module_get(owner);
3630 conswitchp = csw;
3631 }
3632
3e795de7
AD		 3633 first = max(first, con_driver->first);
3634 last = min(last, con_driver->last);
3635
1da177e4
LT		 3636 for (i = first; i <= last; i++) {
3637 int old_was_color;
3638 struct vc_data *vc = vc_cons[i].d;
3639
3640 if (con_driver_map[i])
3641 module_put(con_driver_map[i]->owner);
3642 __module_get(owner);
3643 con_driver_map[i] = csw;
3644
3645 if (!vc || !vc->vc_sw)
3646 continue;
3647
3648 j = i;
1c8ce271 3649
6ca8dfd7 3650 if (con_is_visible(vc)) {
4ee1acce 3651 k = i;
1da177e4 3652 save_screen(vc);
4ee1acce
DH		 3653 }
3654
1da177e4
LT		 3655 old_was_color = vc->vc_can_do_color;
3656 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3657 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3658 visual_init(vc, i, 0);
1c8ce271 3659 set_origin(vc);
1da177e4
LT		 3660 update_attr(vc);
3661
3662 /* If the console changed between mono <-> color, then
3663 * the attributes in the screenbuf will be wrong. The
3664 * following resets all attributes to something sane.
3665 */
3666 if (old_was_color != vc->vc_can_do_color)
3667 clear_buffer_attributes(vc);
1da177e4 3668 }
4ee1acce 3669
1ffdda95 3670 pr_info("Console: switching ");
1da177e4 3671 if (!deflt)
bccf1da3 3672 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3673 if (j >= 0) {
3674 struct vc_data *vc = vc_cons[j].d;
3675
bccf1da3
JP		 3676 pr_cont("to %s %s %dx%d\n",
3677 vc->vc_can_do_color ? "colour" : "mono",
3678 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3679
3680 if (k >= 0) {
3681 vc = vc_cons[k].d;
3682 update_screen(vc);
3683 }
bccf1da3
JP		 3684 } else {
3685 pr_cont("to %s\n", desc);
3686 }
1da177e4 3687
3e795de7
AD		 3688 retval = 0;
3689err:
1da177e4 3690 module_put(owner);
3e795de7
AD		 3691 return retval;
3692};
1da177e4 3693
50e244cc 3694
13ae6645 3695#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86 3696int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3697{
3e795de7
AD		 3698 struct module *owner = csw->owner;
3699 const struct consw *defcsw = NULL;
3700 struct con_driver *con_driver = NULL, *con_back = NULL;
3701 int i, retval = -ENODEV;
1da177e4 3702
3e795de7
AD		 3703 if (!try_module_get(owner))
3704 return -ENODEV;
3705
e93a9a86 3706 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3707
3708 /* check if driver is registered and if it is unbindable */
3709 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3710 con_driver = &registered_con_driver[i];
3711
3712 if (con_driver->con == csw &&
6db4063c 3713 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3714 retval = 0;
3715 break;
3716 }
3717 }
3718
e93a9a86 3719 if (retval)
3e795de7 3720 goto err;
3e795de7 3721
6db4063c
AD		 3722 retval = -ENODEV;
3723
3e795de7
AD		 3724 /* check if backup driver exists */
3725 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3726 con_back = &registered_con_driver[i];
3727
249f7b3e 3728 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3729 defcsw = con_back->con;
3730 retval = 0;
3731 break;
3732 }
3733 }
3734
e93a9a86 3735 if (retval)
3e795de7 3736 goto err;
3e795de7 3737
e93a9a86 3738 if (!con_is_bound(csw))
3e795de7 3739 goto err;
3e795de7
AD		 3740
3741 first = max(first, con_driver->first);
3742 last = min(last, con_driver->last);
3743
3744 for (i = first; i <= last; i++) {
1da177e4
LT		 3745 if (con_driver_map[i] == csw) {
3746 module_put(csw->owner);
3747 con_driver_map[i] = NULL;
3748 }
3e795de7
AD		 3749 }
3750
3751 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3752 const struct consw *defconsw = conswitchp;
3753
3e795de7
AD		 3754 defcsw->con_startup();
3755 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3756 /*
3757 * vgacon may change the default driver to point
3758 * to dummycon, we restore it here...
3759 */
3760 conswitchp = defconsw;
3e795de7
AD		 3761 }
3762
3763 if (!con_is_bound(csw))
3764 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3765
6db4063c 3766 /* ignore return value, binding should not fail */
50e244cc 3767 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3768err:
3769 module_put(owner);
3770 return retval;
3771
3772}
e93a9a86 3773EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3774
6db4063c
AD		 3775static int vt_bind(struct con_driver *con)
3776{
3777 const struct consw *defcsw = NULL, *csw = NULL;
3778 int i, more = 1, first = -1, last = -1, deflt = 0;
3779
77232f79 3780 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3781 goto err;
3782
3783 csw = con->con;
3784
3785 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3786 struct con_driver *con = &registered_con_driver[i];
3787
3788 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3789 defcsw = con->con;
3790 break;
3791 }
3792 }
3793
3794 if (!defcsw)
3795 goto err;
3796
3797 while (more) {
3798 more = 0;
3799
3800 for (i = con->first; i <= con->last; i++) {
3801 if (con_driver_map[i] == defcsw) {
3802 if (first == -1)
3803 first = i;
3804 last = i;
3805 more = 1;
3806 } else if (first != -1)
3807 break;
3808 }
3809
3810 if (first == 0 && last == MAX_NR_CONSOLES -1)
3811 deflt = 1;
3812
4c215fe8 3813 if (first != -1)
c62a1e57 3814 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3815
3816 first = -1;
3817 last = -1;
3818 deflt = 0;
3819 }
3820
3821err:
3822 return 0;
3823}
3824
3825static int vt_unbind(struct con_driver *con)
3826{
3827 const struct consw *csw = NULL;
3828 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3829 int ret;
6db4063c 3830
77232f79 3831 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3832 goto err;
3833
3834 csw = con->con;
3835
3836 while (more) {
3837 more = 0;
3838
3839 for (i = con->first; i <= con->last; i++) {
3840 if (con_driver_map[i] == csw) {
3841 if (first == -1)
3842 first = i;
3843 last = i;
3844 more = 1;
3845 } else if (first != -1)
3846 break;
3847 }
3848
3849 if (first == 0 && last == MAX_NR_CONSOLES -1)
3850 deflt = 1;
3851
618f2b90 3852 if (first != -1) {
f418f2ec 3853 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3854 if (ret != 0)
3855 return ret;
618f2b90 3856 }
6db4063c
AD		 3857
3858 first = -1;
3859 last = -1;
3860 deflt = 0;
3861 }
3862
3863err:
3864 return 0;
3865}
13ae6645
AD		 3866#else
3867static inline int vt_bind(struct con_driver *con)
3868{
3869 return 0;
3870}
3871static inline int vt_unbind(struct con_driver *con)
3872{
3873 return 0;
3874}
3875#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3876
805952a8 3877static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3878 const char *buf, size_t count)
3879{
805952a8 3880 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3881 int bind = simple_strtoul(buf, NULL, 0);
3882
4c215fe8
ID		 3883 console_lock();
3884
6db4063c
AD		 3885 if (bind)
3886 vt_bind(con);
3887 else
3888 vt_unbind(con);
3889
4c215fe8
ID		 3890 console_unlock();
3891
6db4063c
AD		 3892 return count;
3893}
3894
805952a8
GKH		 3895static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3896 char *buf)
6db4063c 3897{
805952a8 3898 struct con_driver *con = dev_get_drvdata(dev);
61d51456
DV		 3899 int bind;
3900
3901 console_lock();
3902 bind = con_is_bound(con->con);
3903 console_unlock();
6db4063c
AD		 3904
3905 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3906}
3907
805952a8
GKH		 3908static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3909 char *buf)
6db4063c 3910{
805952a8 3911 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3912
3913 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3914 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3915 con->desc);
3916
3917}
3918
1083a7be
TI		 3919static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3920static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3921
3922static struct attribute *con_dev_attrs[] = {
3923 &dev_attr_bind.attr,
3924 &dev_attr_name.attr,
3925 NULL
6db4063c
AD		 3926};
3927
1083a7be
TI		 3928ATTRIBUTE_GROUPS(con_dev);
3929
805952a8 3930static int vtconsole_init_device(struct con_driver *con)
6db4063c 3931{
928e964f 3932 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3933 return 0;
6db4063c
AD		 3934}
3935
805952a8 3936static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3937{
1083a7be 3938 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3939}
3940
3e795de7
AD		 3941/**
3942 * con_is_bound - checks if driver is bound to the console
3943 * @csw: console driver
3944 *
3945 * RETURNS: zero if unbound, nonzero if bound
3946 *
3947 * Drivers can call this and if zero, they should release
3948 * all resources allocated on con_startup()
3949 */
3950int con_is_bound(const struct consw *csw)
3951{
3952 int i, bound = 0;
3953
ddde3c18
DV		 3954 WARN_CONSOLE_UNLOCKED();
3955
3e795de7
AD		 3956 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3957 if (con_driver_map[i] == csw) {
3958 bound = 1;
3959 break;
3960 }
3961 }
3962
3963 return bound;
3964}
3965EXPORT_SYMBOL(con_is_bound);
3966
ddde3c18
DV		 3967/**
3968 * con_is_visible - checks whether the current console is visible
3969 * @vc: virtual console
3970 *
3971 * RETURNS: zero if not visible, nonzero if visible
3972 */
3973bool con_is_visible(const struct vc_data *vc)
3974{
3975 WARN_CONSOLE_UNLOCKED();
3976
3977 return *vc->vc_display_fg == vc;
3978}
3979EXPORT_SYMBOL(con_is_visible);
3980
b45cfba4
JB		 3981/**
3982 * con_debug_enter - prepare the console for the kernel debugger
3983 * @sw: console driver
3984 *
3985 * Called when the console is taken over by the kernel debugger, this
3986 * function needs to save the current console state, then put the console
3987 * into a state suitable for the kernel debugger.
3988 *
3989 * RETURNS:
3990 * Zero on success, nonzero if a failure occurred when trying to prepare
3991 * the console for the debugger.
3992 */
3993int con_debug_enter(struct vc_data *vc)
3994{
3995 int ret = 0;
3996
3997 saved_fg_console = fg_console;
3998 saved_last_console = last_console;
3999 saved_want_console = want_console;
4000 saved_vc_mode = vc->vc_mode;
beed5336 4001 saved_console_blanked = console_blanked;
b45cfba4
JB		 4002 vc->vc_mode = KD_TEXT;
4003 console_blanked = 0;
4004 if (vc->vc_sw->con_debug_enter)
4005 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 4006#ifdef CONFIG_KGDB_KDB
4007 /* Set the initial LINES variable if it is not already set */
4008 if (vc->vc_rows < 999) {
4009 int linecount;
4010 char lns[4];
4011 const char *setargs[3] = {
4012 "set",
4013 "LINES",
4014 lns,
4015 };
4016 if (kdbgetintenv(setargs[0], &linecount)) {
4017 snprintf(lns, 4, "%i", vc->vc_rows);
4018 kdb_set(2, setargs);
4019 }
4020 }
17b572e8
JW		 4021 if (vc->vc_cols < 999) {
4022 int colcount;
4023 char cols[4];
4024 const char *setargs[3] = {
4025 "set",
4026 "COLUMNS",
4027 cols,
4028 };
4029 if (kdbgetintenv(setargs[0], &colcount)) {
4030 snprintf(cols, 4, "%i", vc->vc_cols);
4031 kdb_set(2, setargs);
4032 }
4033 }
81d44507 4034#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 4035 return ret;
4036}
4037EXPORT_SYMBOL_GPL(con_debug_enter);
4038
4039/**
4040 * con_debug_leave - restore console state
4041 * @sw: console driver
4042 *
4043 * Restore the console state to what it was before the kernel debugger
4044 * was invoked.
4045 *
4046 * RETURNS:
4047 * Zero on success, nonzero if a failure occurred when trying to restore
4048 * the console.
4049 */
4050int con_debug_leave(void)
4051{
4052 struct vc_data *vc;
4053 int ret = 0;
4054
4055 fg_console = saved_fg_console;
4056 last_console = saved_last_console;
4057 want_console = saved_want_console;
beed5336 4058 console_blanked = saved_console_blanked;
b45cfba4
JB		 4059 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4060
4061 vc = vc_cons[fg_console].d;
4062 if (vc->vc_sw->con_debug_leave)
4063 ret = vc->vc_sw->con_debug_leave(vc);
4064 return ret;
4065}
4066EXPORT_SYMBOL_GPL(con_debug_leave);
4067
50e244cc 4068static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 4069{
4070 struct module *owner = csw->owner;
4071 struct con_driver *con_driver;
4072 const char *desc;
96317e9e 4073 int i, retval;
3e795de7 4074
50e244cc
AC		 4075 WARN_CONSOLE_UNLOCKED();
4076
3e795de7
AD		 4077 if (!try_module_get(owner))
4078 return -ENODEV;
4079
3e795de7
AD		 4080 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4081 con_driver = &registered_con_driver[i];
4082
4083 /* already registered */
96317e9e 4084 if (con_driver->con == csw) {
c55c63c6 4085 retval = -EBUSY;
96317e9e
JS		 4086 goto err;
4087 }
3e795de7
AD		 4088 }
4089
3e795de7 4090 desc = csw->con_startup();
6798df4c
JS		 4091 if (!desc) {
4092 retval = -ENODEV;
3e795de7 4093 goto err;
6798df4c 4094 }
3e795de7
AD		 4095
4096 retval = -EINVAL;
4097
4098 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4099 con_driver = &registered_con_driver[i];
4100
d364b5c3
ID		 4101 if (con_driver->con == NULL &&
4102 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 4103 con_driver->con = csw;
4104 con_driver->desc = desc;
6db4063c
AD		 4105 con_driver->node = i;
4106 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 4107 CON_DRIVER_FLAG_INIT;
4108 con_driver->first = first;
4109 con_driver->last = last;
4110 retval = 0;
4111 break;
4112 }
4113 }
4114
6db4063c
AD		 4115 if (retval)
4116 goto err;
4117
1083a7be
TI		 4118 con_driver->dev =
4119 device_create_with_groups(vtconsole_class, NULL,
4120 MKDEV(0, con_driver->node),
4121 con_driver, con_dev_groups,
4122 "vtcon%i", con_driver->node);
805952a8 4123 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 4124 pr_warn("Unable to create device for %s; errno = %ld\n",
4125 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 4126 con_driver->dev = NULL;
6db4063c 4127 } else {
805952a8 4128 vtconsole_init_device(con_driver);
6db4063c 4129 }
928e964f 4130
3e795de7 4131err:
3e795de7
AD		 4132 module_put(owner);
4133 return retval;
4134}
50e244cc 4135
3e795de7
AD		 4136
4137/**
50539dd4 4138 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 4139 * @csw: console driver
4140 *
4141 * DESCRIPTION: All drivers that registers to the console layer must
4142 * call this function upon exit, or if the console driver is in a state
4143 * where it won't be able to handle console services, such as the
4144 * framebuffer console without loaded framebuffer drivers.
4145 *
4146 * The driver must unbind first prior to unregistration.
4147 */
e93a9a86
TI		 4148int do_unregister_con_driver(const struct consw *csw)
4149{
d9c660e7 4150 int i;
3e795de7
AD		 4151
4152 /* cannot unregister a bound driver */
4153 if (con_is_bound(csw))
d9c660e7
DV		 4154 return -EBUSY;
4155
4156 if (csw == conswitchp)
4157 return -EINVAL;
3e795de7
AD		 4158
4159 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4160 struct con_driver *con_driver = &registered_con_driver[i];
4161
2cf30f75 4162 if (con_driver->con == csw) {
d364b5c3
ID		 4163 /*
4164 * Defer the removal of the sysfs entries since that
4165 * will acquire the kernfs s_active lock and we can't
4166 * acquire this lock while holding the console lock:
4167 * the unbind sysfs entry imposes already the opposite
4168 * order. Reset con already here to prevent any later
4169 * lookup to succeed and mark this slot as zombie, so
4170 * it won't get reused until we complete the removal
4171 * in the deferred work.
4172 */
3e795de7 4173 con_driver->con = NULL;
d364b5c3
ID		 4174 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4175 schedule_work(&con_driver_unregister_work);
4176
d9c660e7 4177 return 0;
3e795de7
AD		 4178 }
4179 }
d9c660e7
DV		 4180
4181 return -ENODEV;
3e795de7 4182}
e93a9a86 4183EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4184
d364b5c3
ID		 4185static void con_driver_unregister_callback(struct work_struct *ignored)
4186{
4187 int i;
4188
4189 console_lock();
4190
4191 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4192 struct con_driver *con_driver = &registered_con_driver[i];
4193
4194 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4195 continue;
4196
4197 console_unlock();
4198
4199 vtconsole_deinit_device(con_driver);
4200 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4201
4202 console_lock();
4203
4204 if (WARN_ON_ONCE(con_driver->con))
4205 con_driver->con = NULL;
4206 con_driver->desc = NULL;
4207 con_driver->dev = NULL;
4208 con_driver->node = 0;
4209 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4210 con_driver->flag = 0;
4211 con_driver->first = 0;
4212 con_driver->last = 0;
4213 }
4214
4215 console_unlock();
4216}
4217
3e795de7
AD		 4218/*
4219 * If we support more console drivers, this function is used
4220 * when a driver wants to take over some existing consoles
4221 * and become default driver for newly opened ones.
4222 *
0095ab42 4223 * do_take_over_console is basically a register followed by bind
50e244cc
AC		 4224 */
4225int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4226{
4227 int err;
4228
4229 err = do_register_con_driver(csw, first, last);
4230 /*
4231 * If we get an busy error we still want to bind the console driver
4232 * and return success, as we may have unbound the console driver
4233 * but not unregistered it.
4234 */
4235 if (err == -EBUSY)
4236 err = 0;
4237 if (!err)
4238 do_bind_con_driver(csw, first, last, deflt);
4239
4240 return err;
4241}
4242EXPORT_SYMBOL_GPL(do_take_over_console);
4243
3e795de7
AD		 4244
4245/*
4246 * give_up_console is a wrapper to unregister_con_driver. It will only
4247 * work if driver is fully unbound.
4248 */
4249void give_up_console(const struct consw *csw)
4250{
70125e76
WY		 4251 console_lock();
4252 do_unregister_con_driver(csw);
4253 console_unlock();
3e795de7
AD		 4254}
4255
6db4063c 4256static int __init vtconsole_class_init(void)
3e795de7 4257{
6db4063c 4258 int i;
3e795de7 4259
6db4063c
AD		 4260 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4261 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4262 pr_warn("Unable to create vt console class; errno = %ld\n",
4263 PTR_ERR(vtconsole_class));
6db4063c
AD		 4264 vtconsole_class = NULL;
4265 }
3e795de7 4266
6db4063c 4267 /* Add system drivers to sysfs */
3e795de7
AD		 4268 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4269 struct con_driver *con = &registered_con_driver[i];
4270
805952a8 4271 if (con->con && !con->dev) {
1083a7be
TI		 4272 con->dev =
4273 device_create_with_groups(vtconsole_class, NULL,
4274 MKDEV(0, con->node),
4275 con, con_dev_groups,
4276 "vtcon%i", con->node);
6db4063c 4277
805952a8 4278 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4279 pr_warn("Unable to create device for %s; errno = %ld\n",
4280 con->desc, PTR_ERR(con->dev));
805952a8 4281 con->dev = NULL;
6db4063c 4282 } else {
805952a8 4283 vtconsole_init_device(con);
6db4063c 4284 }
3e795de7 4285 }
3e795de7
AD		 4286 }
4287
3e795de7
AD		 4288 return 0;
4289}
6db4063c 4290postcore_initcall(vtconsole_class_init);
3e795de7 4291
1da177e4
LT		 4292#endif
4293
4294/*
4295 * Screen blanking
4296 */
4297
403aac96 4298static int set_vesa_blanking(char __user *p)
1da177e4 4299{
403aac96
YY		 4300 unsigned int mode;
4301
4302 if (get_user(mode, p + 1))
4303 return -EFAULT;
4304
4305 vesa_blank_mode = (mode < 4) ? mode : 0;
4306 return 0;
1da177e4
LT		 4307}
4308
1da177e4
LT		 4309void do_blank_screen(int entering_gfx)
4310{
4311 struct vc_data *vc = vc_cons[fg_console].d;
4312 int i;
4313
a135513c
DV		 4314 might_sleep();
4315
1da177e4
LT		 4316 WARN_CONSOLE_UNLOCKED();
4317
4318 if (console_blanked) {
4319 if (blank_state == blank_vesa_wait) {
4320 blank_state = blank_off;
d060a321 4321 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4322 }
4323 return;
4324 }
1da177e4
LT		 4325
4326 /* entering graphics mode? */
4327 if (entering_gfx) {
4328 hide_cursor(vc);
4329 save_screen(vc);
4330 vc->vc_sw->con_blank(vc, -1, 1);
4331 console_blanked = fg_console + 1;
b6e8f00f 4332 blank_state = blank_off;
1da177e4
LT		 4333 set_origin(vc);
4334 return;
4335 }
4336
b6e8f00f 4337 blank_state = blank_off;
4338
1da177e4
LT		 4339 /* don't blank graphics */
4340 if (vc->vc_mode != KD_TEXT) {
4341 console_blanked = fg_console + 1;
4342 return;
4343 }
4344
4345 hide_cursor(vc);
4346 del_timer_sync(&console_timer);
4347 blank_timer_expired = 0;
4348
4349 save_screen(vc);
4350 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4351 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4352 console_blanked = fg_console + 1;
4353 if (i)
4354 set_origin(vc);
4355
4356 if (console_blank_hook && console_blank_hook(1))
4357 return;
4358
d060a321 4359 if (vesa_off_interval && vesa_blank_mode) {
030babac 4360 blank_state = blank_vesa_wait;
1da177e4
LT		 4361 mod_timer(&console_timer, jiffies + vesa_off_interval);
4362 }
8b92e87d 4363 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4364}
4365EXPORT_SYMBOL(do_blank_screen);
4366
4367/*
4368 * Called by timer as well as from vt_console_driver
4369 */
4370void do_unblank_screen(int leaving_gfx)
4371{
4372 struct vc_data *vc;
4373
4374 /* This should now always be called from a "sane" (read: can schedule)
4375 * context for the sake of the low level drivers, except in the special
4376 * case of oops_in_progress
4377 */
4378 if (!oops_in_progress)
4379 might_sleep();
4380
4381 WARN_CONSOLE_UNLOCKED();
4382
4383 ignore_poke = 0;
4384 if (!console_blanked)
4385 return;
4386 if (!vc_cons_allocated(fg_console)) {
4387 /* impossible */
e620e548
JP		 4388 pr_warn("unblank_screen: tty %d not allocated ??\n",
4389 fg_console + 1);
1da177e4
LT		 4390 return;
4391 }
4392 vc = vc_cons[fg_console].d;
8d7fc299 4393 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4394 return; /* but leave console_blanked != 0 */
4395
4396 if (blankinterval) {
f324edc8 4397 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4398 blank_state = blank_normal_wait;
4399 }
4400
4401 console_blanked = 0;
8d7fc299 4402 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4403 /* Low-level driver cannot restore -> do it ourselves */
4404 update_screen(vc);
4405 if (console_blank_hook)
4406 console_blank_hook(0);
4407 set_palette(vc);
4408 set_cursor(vc);
8b92e87d 4409 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4410}
4411EXPORT_SYMBOL(do_unblank_screen);
4412
4413/*
4414 * This is called by the outside world to cause a forced unblank, mostly for
4415 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4416 * call it with 1 as an argument and so force a mode restore... that may kill
4417 * X or at least garbage the screen but would also make the Oops visible...
4418 */
4419void unblank_screen(void)
4420{
4421 do_unblank_screen(0);
4422}
4423
4424/*
70522e12 4425 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4426 * (console operations can still happen at irq time, but only from printk which
70522e12 4427 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4428 */
24ed960a 4429static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4430{
4431 blank_timer_expired = 1;
4432 schedule_work(&console_work);
4433}
4434
4435void poke_blanked_console(void)
4436{
4437 WARN_CONSOLE_UNLOCKED();
4438
4439 /* Add this so we quickly catch whoever might call us in a non
4440 * safe context. Nowadays, unblank_screen() isn't to be called in
4441 * atomic contexts and is allowed to schedule (with the special case
4442 * of oops_in_progress, but that isn't of any concern for this
4443 * function. --BenH.
4444 */
4445 might_sleep();
4446
4447 /* This isn't perfectly race free, but a race here would be mostly harmless,
4448 * at worse, we'll do a spurrious blank and it's unlikely
4449 */
4450 del_timer(&console_timer);
4451 blank_timer_expired = 0;
4452
4453 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4454 return;
4455 if (console_blanked)
4456 unblank_screen();
4457 else if (blankinterval) {
f324edc8 4458 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4459 blank_state = blank_normal_wait;
4460 }
4461}
4462
4463/*
4464 * Palettes
4465 */
4466
4467static void set_palette(struct vc_data *vc)
4468{
4469 WARN_CONSOLE_UNLOCKED();
4470
709280da 4471 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4472 vc->vc_sw->con_set_palette(vc, color_table);
4473}
4474
1da177e4
LT		 4475/*
4476 * Load palette into the DAC registers. arg points to a colour
4477 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4478 */
4479
4480int con_set_cmap(unsigned char __user *arg)
4481{
871bdea6
MG		 4482 int i, j, k;
4483 unsigned char colormap[3*16];
4484
4485 if (copy_from_user(colormap, arg, sizeof(colormap)))
4486 return -EFAULT;
1da177e4 4487
ac751efa 4488 console_lock();
871bdea6
MG		 4489 for (i = k = 0; i < 16; i++) {
4490 default_red[i] = colormap[k++];
4491 default_grn[i] = colormap[k++];
4492 default_blu[i] = colormap[k++];
4493 }
4494 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4495 if (!vc_cons_allocated(i))
4496 continue;
4497 for (j = k = 0; j < 16; j++) {
4498 vc_cons[i].d->vc_palette[k++] = default_red[j];
4499 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4500 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4501 }
4502 set_palette(vc_cons[i].d);
4503 }
ac751efa 4504 console_unlock();
1da177e4 4505
871bdea6 4506 return 0;
1da177e4
LT		 4507}
4508
4509int con_get_cmap(unsigned char __user *arg)
4510{
871bdea6
MG		 4511 int i, k;
4512 unsigned char colormap[3*16];
1da177e4 4513
ac751efa 4514 console_lock();
871bdea6
MG		 4515 for (i = k = 0; i < 16; i++) {
4516 colormap[k++] = default_red[i];
4517 colormap[k++] = default_grn[i];
4518 colormap[k++] = default_blu[i];
4519 }
ac751efa 4520 console_unlock();
1da177e4 4521
871bdea6
MG		 4522 if (copy_to_user(arg, colormap, sizeof(colormap)))
4523 return -EFAULT;
4524
4525 return 0;
1da177e4
LT		 4526}
4527
4528void reset_palette(struct vc_data *vc)
4529{
4530 int j, k;
4531 for (j=k=0; j<16; j++) {
4532 vc->vc_palette[k++] = default_red[j];
4533 vc->vc_palette[k++] = default_grn[j];
4534 vc->vc_palette[k++] = default_blu[j];
4535 }
4536 set_palette(vc);
4537}
4538
4539/*
4540 * Font switching
4541 *
4542 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4543 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4544 * depending on width) reserved for each character which is kinda wasty, but
4545 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4546 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4547 * format (maybe we should add a `fontoffset' field to the `display'
4548 * structure so we won't have to convert the fontdata all the time.
4549 * /Jes
4550 */
4551
4552#define max_font_size 65536
4553
4554static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4555{
4556 struct console_font font;
4557 int rc = -EINVAL;
4558 int c;
4559
1da177e4
LT		 4560 if (op->data) {
4561 font.data = kmalloc(max_font_size, GFP_KERNEL);
4562 if (!font.data)
4563 return -ENOMEM;
4564 } else
4565 font.data = NULL;
4566
ac751efa 4567 console_lock();
edab558f
AC		 4568 if (vc->vc_mode != KD_TEXT)
4569 rc = -EINVAL;
4570 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4571 rc = vc->vc_sw->con_font_get(vc, &font);
4572 else
4573 rc = -ENOSYS;
ac751efa 4574 console_unlock();
1da177e4
LT		 4575
4576 if (rc)
4577 goto out;
4578
4579 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4580
1da177e4
LT		 4581 if (op->data && font.charcount > op->charcount)
4582 rc = -ENOSPC;
4583 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4584 if (font.width > op->width || font.height > op->height)
4585 rc = -ENOSPC;
4586 } else {
4587 if (font.width != 8)
4588 rc = -EIO;
4589 else if ((op->height && font.height > op->height) ||
4590 font.height > 32)
4591 rc = -ENOSPC;
4592 }
4593 if (rc)
4594 goto out;
4595
4596 op->height = font.height;
4597 op->width = font.width;
4598 op->charcount = font.charcount;
4599
4600 if (op->data && copy_to_user(op->data, font.data, c))
4601 rc = -EFAULT;
4602
4603out:
4604 kfree(font.data);
4605 return rc;
4606}
4607
4608static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4609{
4610 struct console_font font;
4611 int rc = -EINVAL;
4612 int size;
4613
4614 if (vc->vc_mode != KD_TEXT)
4615 return -EINVAL;
4616 if (!op->data)
4617 return -EINVAL;
4618 if (op->charcount > 512)
4619 return -EINVAL;
8ffb8209
MX		 4620 if (op->width <= 0 || op->width > 32 || op->height > 32)
4621 return -EINVAL;
4622 size = (op->width+7)/8 * 32 * op->charcount;
4623 if (size > max_font_size)
4624 return -ENOSPC;
4625
4626 font.data = memdup_user(op->data, size);
4627 if (IS_ERR(font.data))
4628 return PTR_ERR(font.data);
4629
1da177e4
LT		 4630 if (!op->height) { /* Need to guess font height [compat] */
4631 int h, i;
8ffb8209
MX		 4632 u8 *charmap = font.data;
4633
4634 /*
4635 * If from KDFONTOP ioctl, don't allow things which can be done
4636 * in userland,so that we can get rid of this soon
4637 */
4638 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4639 kfree(font.data);
1da177e4 4640 return -EINVAL;
8ffb8209
MX		 4641 }
4642
1da177e4 4643 for (h = 32; h > 0; h--)
8ffb8209
MX		 4644 for (i = 0; i < op->charcount; i++)
4645 if (charmap[32*i+h-1])
1da177e4 4646 goto nonzero;
8ffb8209
MX		 4647
4648 kfree(font.data);
1da177e4 4649 return -EINVAL;
8ffb8209 4650
1da177e4
LT		 4651 nonzero:
4652 op->height = h;
4653 }
8ffb8209 4654
1da177e4 4655 font.charcount = op->charcount;
1da177e4 4656 font.width = op->width;
8ffb8209
MX		 4657 font.height = op->height;
4658
ac751efa 4659 console_lock();
edab558f
AC		 4660 if (vc->vc_mode != KD_TEXT)
4661 rc = -EINVAL;
4662 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4663 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4664 else
4665 rc = -ENOSYS;
ac751efa 4666 console_unlock();
1da177e4
LT		 4667 kfree(font.data);
4668 return rc;
4669}
4670
4671static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4672{
4673 struct console_font font = {.width = op->width, .height = op->height};
4674 char name[MAX_FONT_NAME];
4675 char *s = name;
4676 int rc;
4677
1da177e4
LT		 4678
4679 if (!op->data)
4680 s = NULL;
4681 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4682 return -EFAULT;
4683 else
4684 name[MAX_FONT_NAME - 1] = 0;
4685
ac751efa 4686 console_lock();
edab558f
AC		 4687 if (vc->vc_mode != KD_TEXT) {
4688 console_unlock();
4689 return -EINVAL;
4690 }
1da177e4
LT		 4691 if (vc->vc_sw->con_font_default)
4692 rc = vc->vc_sw->con_font_default(vc, &font, s);
4693 else
4694 rc = -ENOSYS;
ac751efa 4695 console_unlock();
1da177e4
LT		 4696 if (!rc) {
4697 op->width = font.width;
4698 op->height = font.height;
4699 }
4700 return rc;
4701}
4702
4703static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4704{
4705 int con = op->height;
4706 int rc;
4707
1da177e4 4708
ac751efa 4709 console_lock();
edab558f
AC		 4710 if (vc->vc_mode != KD_TEXT)
4711 rc = -EINVAL;
4712 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4713 rc = -ENOSYS;
4714 else if (con < 0 || !vc_cons_allocated(con))
4715 rc = -ENOTTY;
4716 else if (con == vc->vc_num) /* nothing to do */
4717 rc = 0;
4718 else
4719 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4720 console_unlock();
1da177e4
LT		 4721 return rc;
4722}
4723
4724int con_font_op(struct vc_data *vc, struct console_font_op *op)
4725{
4726 switch (op->op) {
4727 case KD_FONT_OP_SET:
4728 return con_font_set(vc, op);
4729 case KD_FONT_OP_GET:
4730 return con_font_get(vc, op);
4731 case KD_FONT_OP_SET_DEFAULT:
4732 return con_font_default(vc, op);
4733 case KD_FONT_OP_COPY:
4734 return con_font_copy(vc, op);
4735 }
4736 return -ENOSYS;
4737}
4738
4739/*
4740 * Interface exported to selection and vcs.
4741 */
4742
4743/* used by selection */
d73568c4 4744u16 screen_glyph(const struct vc_data *vc, int offset)
1da177e4
LT		 4745{
4746 u16 w = scr_readw(screenpos(vc, offset, 1));
4747 u16 c = w & 0xff;
4748
4749 if (w & vc->vc_hi_font_mask)
4750 c |= 0x100;
4751 return c;
4752}
f7511d5f 4753EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4754
d73568c4 4755u32 screen_glyph_unicode(const struct vc_data *vc, int n)
9bfdc261
AB		 4756{
4757 struct uni_screen *uniscr = get_vc_uniscr(vc);
4758
4759 if (uniscr)
4760 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4761 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4762}
4763EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4764
1da177e4 4765/* used by vcs - note the word offset */
d73568c4 4766unsigned short *screen_pos(const struct vc_data *vc, int w_offset, int viewed)
1da177e4
LT		 4767{
4768 return screenpos(vc, 2 * w_offset, viewed);
4769}
88867e3d 4770EXPORT_SYMBOL_GPL(screen_pos);
1da177e4 4771
d73568c4 4772void getconsxy(const struct vc_data *vc, unsigned char *p)
1da177e4 4773{
8a085494 4774 /* clamp values if they don't fit */
28bc24fc
JS		 4775 p[0] = min(vc->state.x, 0xFFu);
4776 p[1] = min(vc->state.y, 0xFFu);
1da177e4
LT		 4777}
4778
4779void putconsxy(struct vc_data *vc, unsigned char *p)
4780{
9477e260 4781 hide_cursor(vc);
1da177e4
LT		 4782 gotoxy(vc, p[0], p[1]);
4783 set_cursor(vc);
4784}
4785
d73568c4 4786u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
1da177e4
LT		 4787{
4788 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4789 return softcursor_original;
4790 return scr_readw(org);
4791}
4792
4793void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4794{
4795 scr_writew(val, org);
4796 if ((unsigned long)org == vc->vc_pos) {
4797 softcursor_original = -1;
4798 add_softcursor(vc);
4799 }
4800}
4801
432c9ed2
NP		 4802void vcs_scr_updated(struct vc_data *vc)
4803{
4804 notify_update(vc);
4805}
4806
35cc56f9
JS		 4807void vc_scrolldelta_helper(struct vc_data *c, int lines,
4808 unsigned int rolled_over, void *base, unsigned int size)
4809{
4810 unsigned long ubase = (unsigned long)base;
210fd746
JS		 4811 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4812 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4813 ptrdiff_t origin = (void *)c->vc_origin - base;
35cc56f9 4814 int margin = c->vc_size_row * 4;
7c918cdc 4815 int from, wrap, from_off, avail;
35cc56f9
JS		 4816
4817 /* Turn scrollback off */
4818 if (!lines) {
4819 c->vc_visible_origin = c->vc_origin;
4820 return;
4821 }
4822
4823 /* Do we have already enough to allow jumping from 0 to the end? */
210fd746 4824 if (rolled_over > scr_end + margin) {
7c918cdc
JS		 4825 from = scr_end;
4826 wrap = rolled_over + c->vc_size_row;
35cc56f9 4827 } else {
7c918cdc
JS		 4828 from = 0;
4829 wrap = size;
35cc56f9
JS		 4830 }
4831
7c918cdc
JS		 4832 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4833 avail = (origin - from + wrap) % wrap;
35cc56f9
JS		 4834
4835 /* Only a little piece would be left? Show all incl. the piece! */
7c918cdc 4836 if (avail < 2 * margin)
35cc56f9 4837 margin = 0;
7c918cdc
JS		 4838 if (from_off < margin)
4839 from_off = 0;
4840 if (from_off > avail - margin)
4841 from_off = avail;
35cc56f9 4842
7c918cdc 4843 c->vc_visible_origin = ubase + (from + from_off) % wrap;
35cc56f9
JS		 4844}
4845EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4846
1da177e4
LT		 4847/*
4848 * Visible symbols for modules
4849 */
4850
4851EXPORT_SYMBOL(color_table);
4852EXPORT_SYMBOL(default_red);
4853EXPORT_SYMBOL(default_grn);
4854EXPORT_SYMBOL(default_blu);
4855EXPORT_SYMBOL(update_region);
4856EXPORT_SYMBOL(redraw_screen);
4857EXPORT_SYMBOL(vc_resize);
4858EXPORT_SYMBOL(fg_console);
4859EXPORT_SYMBOL(console_blank_hook);
4860EXPORT_SYMBOL(console_blanked);
4861EXPORT_SYMBOL(vc_cons);
f6c06b68 4862EXPORT_SYMBOL(global_cursor_default);
1da177e4 4863#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4864EXPORT_SYMBOL(give_up_console);
4865#endif
Linux 6.x block layer and io_uring tree(s)