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Merge tag 'tty-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[linux-2.6-block.git] / drivers / tty / vt / vt.c
CommitLineData
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 137struct vc vc_cons [MAX_NR_CONSOLES];
921234d7 138EXPORT_SYMBOL(vc_cons);
1da177e4 139
1da177e4 140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
1da177e4
LT		 141
142static int con_open(struct tty_struct *, struct file *);
f68279ca 143static void vc_init(struct vc_data *vc, int do_clear);
1da177e4
LT		 144static void gotoxy(struct vc_data *vc, int new_x, int new_y);
145static void save_cur(struct vc_data *vc);
146static void reset_terminal(struct vc_data *vc, int do_clear);
147static void con_flush_chars(struct tty_struct *tty);
a0b8a168 148static int set_vesa_blanking(u8 __user *mode);
1da177e4
LT		 149static void set_cursor(struct vc_data *vc);
150static void hide_cursor(struct vc_data *vc);
65f27f38 151static void console_callback(struct work_struct *ignored);
d364b5c3 152static void con_driver_unregister_callback(struct work_struct *ignored);
24ed960a 153static void blank_screen_t(struct timer_list *unused);
1da177e4 154static void set_palette(struct vc_data *vc);
0a64ce6e 155static void unblank_screen(void);
1da177e4 156
52c40fca
PH		 157#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
158
77bf2bab 159int default_utf8 = true;
042f10ec 160module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 161int global_cursor_default = -1;
162module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
921234d7 163EXPORT_SYMBOL(global_cursor_default);
1da177e4 164
4dfa3c54 165static int cur_default = CUR_UNDERLINE;
9ea9a886
CL		 166module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
1da177e4
LT		 168/*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172static int ignore_poke;
173
174int do_poke_blanked_console;
175int console_blanked;
921234d7 176EXPORT_SYMBOL(console_blanked);
1da177e4 177
0a58d83d 178static enum vesa_blank_mode vesa_blank_mode;
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;
921234d7 193EXPORT_SYMBOL(fg_console);
1da177e4
LT		 194int last_console;
195int want_console = -1;
921234d7 196
fed891c8
JW		 197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
beed5336 201static int saved_console_blanked;
1da177e4
LT		 202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
921234d7 228EXPORT_SYMBOL(console_blank_hook);
1da177e4 229
1d27e3e2 230static DEFINE_TIMER(console_timer, blank_screen_t);
1da177e4
LT		 231static int blank_state;
232static int blank_timer_expired;
233enum {
234 blank_off = 0,
235 blank_normal_wait,
236 blank_vesa_wait,
237};
238
fbc92a34
KS		 239/*
240 * /sys/class/tty/tty0/
241 *
242 * the attribute 'active' contains the name of the current vc
243 * console and it supports poll() to detect vc switches
244 */
245static struct device *tty0dev;
246
b293d758
ST		 247/*
248 * Notifier list for console events.
249 */
250static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
251
252int register_vt_notifier(struct notifier_block *nb)
253{
254 return atomic_notifier_chain_register(&vt_notifier_list, nb);
255}
256EXPORT_SYMBOL_GPL(register_vt_notifier);
257
258int unregister_vt_notifier(struct notifier_block *nb)
259{
260 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
261}
262EXPORT_SYMBOL_GPL(unregister_vt_notifier);
263
264static void notify_write(struct vc_data *vc, unsigned int unicode)
265{
502fcb79 266 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 267 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
268}
269
270static void notify_update(struct vc_data *vc)
271{
272 struct vt_notifier_param param = { .vc = vc };
273 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
274}
1da177e4
LT		 275/*
276 * Low-Level Functions
277 */
278
6ca8dfd7
JS		 279static inline bool con_is_fg(const struct vc_data *vc)
280{
281 return vc->vc_num == fg_console;
282}
283
284static inline bool con_should_update(const struct vc_data *vc)
285{
286 return con_is_visible(vc) && !console_blanked;
287}
1da177e4 288
fd1ca819
JSS		 289static inline u16 *screenpos(const struct vc_data *vc, unsigned int offset,
290 bool viewed)
1da177e4 291{
7cf01c92
JSS		 292 unsigned long origin = viewed ? vc->vc_visible_origin : vc->vc_origin;
293
fd1ca819 294 return (u16 *)(origin + offset);
1da177e4
LT		 295}
296
387ccbdb
JSS		 297static void con_putc(struct vc_data *vc, u16 ca, unsigned int y, unsigned int x)
298{
299 if (vc->vc_sw->con_putc)
300 vc->vc_sw->con_putc(vc, ca, y, x);
1da177e4 301 else
387ccbdb 302 vc->vc_sw->con_putcs(vc, &ca, 1, y, x);
1da177e4
LT		 303}
304
e33ac1c1 305/* Called from the keyboard irq path.. */
1da177e4
LT		 306static inline void scrolldelta(int lines)
307{
e33ac1c1
AC		 308 /* FIXME */
309 /* scrolldelta needs some kind of consistency lock, but the BKL was
310 and still is not protecting versus the scheduled back end */
1da177e4
LT		 311 scrollback_delta += lines;
312 schedule_console_callback();
313}
314
315void schedule_console_callback(void)
316{
317 schedule_work(&console_work);
318}
319
d8ae7242
NP		 320/*
321 * Code to manage unicode-based screen buffers
322 */
323
d8ae7242
NP		 324/*
325 * Our screen buffer is preceded by an array of line pointers so that
326 * scrolling only implies some pointer shuffling.
327 */
d8ae7242 328
feb36abb 329static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
d8ae7242 330{
feb36abb 331 u32 **uni_lines;
d8ae7242 332 void *p;
feb36abb 333 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
d8ae7242
NP		 334
335 /* allocate everything in one go */
4ba77bfb 336 memsize = col_size * rows;
feb36abb
JSS		 337 memsize += rows * sizeof(*uni_lines);
338 uni_lines = vzalloc(memsize);
339 if (!uni_lines)
d8ae7242
NP		 340 return NULL;
341
342 /* initial line pointers */
feb36abb 343 p = uni_lines + rows;
d8ae7242 344 for (i = 0; i < rows; i++) {
feb36abb 345 uni_lines[i] = p;
4ba77bfb 346 p += col_size;
d8ae7242 347 }
feb36abb
JSS		 348
349 return uni_lines;
d8ae7242
NP		 350}
351
feb36abb 352static void vc_uniscr_free(u32 **uni_lines)
57d38f26 353{
feb36abb 354 vfree(uni_lines);
57d38f26
NP		 355}
356
feb36abb 357static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
d8ae7242 358{
feb36abb
JSS		 359 vc_uniscr_free(vc->vc_uni_lines);
360 vc->vc_uni_lines = new_uni_lines;
d8ae7242
NP		 361}
362
0c8414a6 363static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
d8ae7242 364{
287696d5
JSS		 365 if (vc->vc_uni_lines)
366 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
d8ae7242
NP		 367}
368
369static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
370{
287696d5
JSS		 371 if (vc->vc_uni_lines) {
372 u32 *ln = vc->vc_uni_lines[vc->state.y];
28bc24fc 373 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 374
375 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
376 memset32(&ln[x], ' ', nr);
377 }
378}
379
380static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
381{
287696d5
JSS		 382 if (vc->vc_uni_lines) {
383 u32 *ln = vc->vc_uni_lines[vc->state.y];
28bc24fc 384 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242 385
1581dafa 386 memmove(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
d8ae7242
NP		 387 memset32(&ln[cols - nr], ' ', nr);
388 }
389}
390
391static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
392 unsigned int nr)
393{
287696d5
JSS		 394 if (vc->vc_uni_lines)
395 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
d8ae7242
NP		 396}
397
398static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
399 unsigned int nr)
400{
287696d5 401 if (vc->vc_uni_lines)
d8ae7242 402 while (nr--)
287696d5 403 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
d8ae7242
NP		 404}
405
8aad24ad
JSS		 406/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
407static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
408{
409 unsigned int gcd_idx;
410
411 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
412 u32 *gcd_idx_val = array[gcd_idx];
413 unsigned int dst_idx = gcd_idx;
414
415 while (1) {
416 unsigned int src_idx = (dst_idx + nr) % size;
417 if (src_idx == gcd_idx)
418 break;
419
420 array[dst_idx] = array[src_idx];
421 dst_idx = src_idx;
422 }
423
424 array[dst_idx] = gcd_idx_val;
425 }
426}
427
424c82af
JSS		 428static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
429 unsigned int bottom, enum con_scroll dir,
430 unsigned int nr)
d8ae7242 431{
feb36abb 432 u32 **uni_lines = vc->vc_uni_lines;
424c82af 433 unsigned int size = bottom - top;
d8ae7242 434
287696d5
JSS		 435 if (!uni_lines)
436 return;
d541ae4e 437
287696d5 438 if (dir == SM_DOWN) {
8aad24ad 439 juggle_array(&uni_lines[top], size, size - nr);
424c82af 440 vc_uniscr_clear_lines(vc, top, nr);
8aad24ad
JSS		 441 } else {
442 juggle_array(&uni_lines[top], size, nr);
424c82af 443 vc_uniscr_clear_lines(vc, bottom - nr, nr);
287696d5 444 }
d8ae7242
NP		 445}
446
feb36abb 447static void vc_uniscr_copy_area(u32 **dst_lines,
d8ae7242
NP		 448 unsigned int dst_cols,
449 unsigned int dst_rows,
feb36abb 450 u32 **src_lines,
d8ae7242
NP		 451 unsigned int src_cols,
452 unsigned int src_top_row,
453 unsigned int src_bot_row)
454{
455 unsigned int dst_row = 0;
456
feb36abb 457 if (!dst_lines)
d8ae7242
NP		 458 return;
459
460 while (src_top_row < src_bot_row) {
feb36abb
JSS		 461 u32 *src_line = src_lines[src_top_row];
462 u32 *dst_line = dst_lines[dst_row];
d8ae7242 463
4ba77bfb 464 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
d8ae7242
NP		 465 if (dst_cols - src_cols)
466 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
467 src_top_row++;
468 dst_row++;
469 }
470 while (dst_row < dst_rows) {
feb36abb 471 u32 *dst_line = dst_lines[dst_row];
d8ae7242
NP		 472
473 memset32(dst_line, ' ', dst_cols);
474 dst_row++;
475 }
476}
477
d21b0be2
NP		 478/*
479 * Called from vcs_read() to make sure unicode screen retrieval is possible.
480 * This will initialize the unicode screen buffer if not already done.
481 * This returns 0 if OK, or a negative error code otherwise.
482 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
483 */
484int vc_uniscr_check(struct vc_data *vc)
485{
feb36abb 486 u32 **uni_lines;
d21b0be2
NP		 487 unsigned short *p;
488 int x, y, mask;
489
d21b0be2
NP		 490 WARN_CONSOLE_UNLOCKED();
491
492 if (!vc->vc_utf)
493 return -ENODATA;
494
feb36abb 495 if (vc->vc_uni_lines)
d21b0be2
NP		 496 return 0;
497
feb36abb
JSS		 498 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
499 if (!uni_lines)
d21b0be2
NP		 500 return -ENOMEM;
501
502 /*
503 * Let's populate it initially with (imperfect) reverse translation.
504 * This is the next best thing we can do short of having it enabled
505 * from the start even when no users rely on this functionality. True
506 * unicode content will be available after a complete screen refresh.
507 */
508 p = (unsigned short *)vc->vc_origin;
509 mask = vc->vc_hi_font_mask | 0xff;
510 for (y = 0; y < vc->vc_rows; y++) {
feb36abb 511 u32 *line = uni_lines[y];
d21b0be2
NP		 512 for (x = 0; x < vc->vc_cols; x++) {
513 u16 glyph = scr_readw(p++) & mask;
514 line[x] = inverse_translate(vc, glyph, true);
515 }
516 }
517
feb36abb
JSS		 518 vc->vc_uni_lines = uni_lines;
519
d21b0be2
NP		 520 return 0;
521}
522
523/*
524 * Called from vcs_read() to get the unicode data from the screen.
525 * This must be preceded by a successful call to vc_uniscr_check() once
526 * the console lock has been taken.
527 */
b8209f69 528void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
d21b0be2
NP		 529 unsigned int row, unsigned int col, unsigned int nr)
530{
feb36abb 531 u32 **uni_lines = vc->vc_uni_lines;
708d0bff
NP		 532 int offset = row * vc->vc_size_row + col * 2;
533 unsigned long pos;
d21b0be2 534
441c9381
JSS		 535 if (WARN_ON_ONCE(!uni_lines))
536 return;
708d0bff
NP		 537
538 pos = (unsigned long)screenpos(vc, offset, viewed);
539 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
540 /*
541 * Desired position falls in the main screen buffer.
542 * However the actual row/col might be different if
543 * scrollback is active.
544 */
545 row = (pos - vc->vc_origin) / vc->vc_size_row;
546 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
feb36abb 547 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
708d0bff
NP		 548 } else {
549 /*
550 * Scrollback is active. For now let's simply backtranslate
551 * the screen glyphs until the unicode screen buffer does
552 * synchronize with console display drivers for a scrollback
553 * buffer of its own.
554 */
555 u16 *p = (u16 *)pos;
556 int mask = vc->vc_hi_font_mask | 0xff;
0c8414a6 557 u32 *uni_buf = dest;
708d0bff
NP		 558 while (nr--) {
559 u16 glyph = scr_readw(p++) & mask;
560 *uni_buf++ = inverse_translate(vc, glyph, true);
561 }
562 }
d21b0be2
NP		 563}
564
424c82af
JSS		 565static void con_scroll(struct vc_data *vc, unsigned int top,
566 unsigned int bottom, enum con_scroll dir,
567 unsigned int nr)
1da177e4 568{
bf8baa00 569 unsigned int rows = bottom - top;
424c82af 570 u16 *clear, *dst, *src;
1da177e4 571
424c82af 572 if (top + nr >= bottom)
bf8baa00 573 nr = rows - 1;
424c82af 574 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
1da177e4 575 return;
424c82af
JSS		 576
577 vc_uniscr_scroll(vc, top, bottom, dir, nr);
578 if (con_is_visible(vc) &&
579 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
1da177e4 580 return;
1da177e4 581
424c82af
JSS		 582 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
583 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
1da177e4 584
89765b94 585 if (dir == SM_UP) {
bf8baa00 586 clear = src + (rows - nr) * vc->vc_cols;
424c82af 587 swap(src, dst);
89765b94 588 }
bf8baa00 589 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
89765b94 590 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
1da177e4
LT		 591}
592
593static void do_update_region(struct vc_data *vc, unsigned long start, int count)
594{
1da177e4 595 unsigned int xx, yy, offset;
f441aa3b
JSS		 596 u16 *p = (u16 *)start;
597
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
1da177e4 601
1da177e4
LT		 602 for(;;) {
603 u16 attrib = scr_readw(p) & 0xff00;
604 int startx = xx;
605 u16 *q = p;
606 while (xx < vc->vc_cols && count) {
607 if (attrib != (scr_readw(p) & 0xff00)) {
608 if (p > q)
609 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
610 startx = xx;
611 q = p;
612 attrib = scr_readw(p) & 0xff00;
613 }
614 p++;
615 xx++;
616 count--;
617 }
618 if (p > q)
619 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
620 if (!count)
621 break;
622 xx = 0;
623 yy++;
1da177e4 624 }
1da177e4
LT		 625}
626
627void update_region(struct vc_data *vc, unsigned long start, int count)
628{
629 WARN_CONSOLE_UNLOCKED();
630
6ca8dfd7 631 if (con_should_update(vc)) {
1da177e4
LT		 632 hide_cursor(vc);
633 do_update_region(vc, start, count);
634 set_cursor(vc);
635 }
636}
921234d7 637EXPORT_SYMBOL(update_region);
1da177e4
LT		 638
639/* Structure of attributes is hardware-dependent */
640
b84ae3dc 641static u8 build_attr(struct vc_data *vc, u8 _color,
77bc14f2
JS		 642 enum vc_intensity _intensity, bool _blink, bool _underline,
643 bool _reverse, bool _italic)
1da177e4
LT		 644{
645 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 646 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
647 _blink, _underline, _reverse, _italic);
1da177e4 648
1da177e4
LT		 649/*
650 * ++roman: I completely changed the attribute format for monochrome
651 * mode (!can_do_color). The formerly used MDA (monochrome display
652 * adapter) format didn't allow the combination of certain effects.
653 * Now the attribute is just a bit vector:
654 * Bit 0..1: intensity (0..2)
655 * Bit 2 : underline
656 * Bit 3 : reverse
657 * Bit 7 : blink
658 */
659 {
c9e587ab 660 u8 a = _color;
1da177e4
LT		 661 if (!vc->vc_can_do_color)
662 return _intensity |
c5c717e7
JS		 663 (_italic << 1) |
664 (_underline << 2) |
665 (_reverse << 3) |
666 (_blink << 7);
fa6ce9ab
JE		 667 if (_italic)
668 a = (a & 0xF0) | vc->vc_itcolor;
669 else if (_underline)
1da177e4 670 a = (a & 0xf0) | vc->vc_ulcolor;
b84ae3dc 671 else if (_intensity == VCI_HALF_BRIGHT)
1c65a879 672 a = (a & 0xf0) | vc->vc_halfcolor;
1da177e4 673 if (_reverse)
faace51b 674 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
1da177e4
LT		 675 if (_blink)
676 a ^= 0x80;
b84ae3dc 677 if (_intensity == VCI_BOLD)
1da177e4
LT		 678 a ^= 0x08;
679 if (vc->vc_hi_font_mask == 0x100)
680 a <<= 1;
681 return a;
682 }
1da177e4
LT		 683}
684
685static void update_attr(struct vc_data *vc)
686{
28bc24fc
JS		 687 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
688 vc->state.blink, vc->state.underline,
689 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
b84ae3dc 690 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
77bc14f2
JS		 691 VCI_NORMAL, vc->state.blink, false,
692 vc->vc_decscnm, false) << 8);
1da177e4
LT		 693}
694
695/* Note: inverting the screen twice should revert to the original state */
b8209f69 696void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
1da177e4 697{
fd1ca819 698 u16 *p;
1da177e4
LT		 699
700 WARN_CONSOLE_UNLOCKED();
701
702 count /= 2;
703 p = screenpos(vc, offset, viewed);
6af39ed3 704 if (vc->vc_sw->con_invert_region) {
1da177e4 705 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 706 } else {
1da177e4
LT		 707 u16 *q = p;
708 int cnt = count;
709 u16 a;
710
711 if (!vc->vc_can_do_color) {
712 while (cnt--) {
713 a = scr_readw(q);
714 a ^= 0x0800;
715 scr_writew(a, q);
716 q++;
717 }
718 } else if (vc->vc_hi_font_mask == 0x100) {
719 while (cnt--) {
720 a = scr_readw(q);
faace51b
JS		 721 a = (a & 0x11ff) |
722 ((a & 0xe000) >> 4) |
723 ((a & 0x0e00) << 4);
1da177e4
LT		 724 scr_writew(a, q);
725 q++;
726 }
727 } else {
728 while (cnt--) {
729 a = scr_readw(q);
faace51b
JS		 730 a = (a & 0x88ff) |
731 ((a & 0x7000) >> 4) |
732 ((a & 0x0700) << 4);
1da177e4
LT		 733 scr_writew(a, q);
734 q++;
735 }
736 }
737 }
6af39ed3 738
6ca8dfd7 739 if (con_should_update(vc))
1da177e4 740 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 741 notify_update(vc);
1da177e4
LT		 742}
743
744/* used by selection: complement pointer position */
745void complement_pos(struct vc_data *vc, int offset)
746{
414edcd3 747 static int old_offset = -1;
1da177e4
LT		 748 static unsigned short old;
749 static unsigned short oldx, oldy;
750
751 WARN_CONSOLE_UNLOCKED();
752
414edcd3
AD		 753 if (old_offset != -1 && old_offset >= 0 &&
754 old_offset < vc->vc_screenbuf_size) {
b8209f69 755 scr_writew(old, screenpos(vc, old_offset, true));
6ca8dfd7 756 if (con_should_update(vc))
387ccbdb 757 con_putc(vc, old, oldy, oldx);
19e3ae6b 758 notify_update(vc);
1da177e4 759 }
414edcd3
AD		 760
761 old_offset = offset;
762
763 if (offset != -1 && offset >= 0 &&
764 offset < vc->vc_screenbuf_size) {
1da177e4 765 unsigned short new;
fd1ca819 766 u16 *p = screenpos(vc, offset, true);
1da177e4
LT		 767 old = scr_readw(p);
768 new = old ^ vc->vc_complement_mask;
769 scr_writew(new, p);
6ca8dfd7 770 if (con_should_update(vc)) {
1da177e4
LT		 771 oldx = (offset >> 1) % vc->vc_cols;
772 oldy = (offset >> 1) / vc->vc_cols;
387ccbdb 773 con_putc(vc, new, oldy, oldx);
1da177e4 774 }
19e3ae6b 775 notify_update(vc);
1da177e4
LT		 776 }
777}
778
779static void insert_char(struct vc_data *vc, unsigned int nr)
780{
81732c3b 781 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 782
d8ae7242 783 vc_uniscr_insert(vc, nr);
28bc24fc 784 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
81732c3b 785 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 786 vc->vc_need_wrap = 0;
6ca8dfd7 787 if (con_should_update(vc))
81732c3b 788 do_update_region(vc, (unsigned long) p,
28bc24fc 789 vc->vc_cols - vc->state.x);
1da177e4
LT		 790}
791
792static void delete_char(struct vc_data *vc, unsigned int nr)
793{
81732c3b 794 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 795
d8ae7242 796 vc_uniscr_delete(vc, nr);
39cdb68c 797 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
28bc24fc 798 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
81732c3b 799 nr * 2);
1da177e4 800 vc->vc_need_wrap = 0;
6ca8dfd7 801 if (con_should_update(vc))
81732c3b 802 do_update_region(vc, (unsigned long) p,
28bc24fc 803 vc->vc_cols - vc->state.x);
1da177e4
LT		 804}
805
e882f715 806static int softcursor_original = -1;
1da177e4
LT		 807
808static void add_softcursor(struct vc_data *vc)
809{
810 int i = scr_readw((u16 *) vc->vc_pos);
811 u32 type = vc->vc_cursor_type;
812
c0e4b3ad 813 if (!(type & CUR_SW))
dc219db6
JS		 814 return;
815 if (softcursor_original != -1)
816 return;
1da177e4 817 softcursor_original = i;
c0e4b3ad
JS		 818 i |= CUR_SET(type);
819 i ^= CUR_CHANGE(type);
820 if ((type & CUR_ALWAYS_BG) &&
821 (softcursor_original & CUR_BG) == (i & CUR_BG))
822 i ^= CUR_BG;
823 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
824 i ^= CUR_FG;
dc219db6 825 scr_writew(i, (u16 *)vc->vc_pos);
6ca8dfd7 826 if (con_should_update(vc))
387ccbdb 827 con_putc(vc, i, vc->state.y, vc->state.x);
1da177e4
LT		 828}
829
830static void hide_softcursor(struct vc_data *vc)
831{
832 if (softcursor_original != -1) {
833 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 834 if (con_should_update(vc))
387ccbdb
JSS		 835 con_putc(vc, softcursor_original, vc->state.y,
836 vc->state.x);
1da177e4
LT		 837 softcursor_original = -1;
838 }
839}
840
841static void hide_cursor(struct vc_data *vc)
842{
dce05aa6 843 if (vc_is_sel(vc))
1da177e4 844 clear_selection();
dce05aa6 845
a292e3fc 846 vc->vc_sw->con_cursor(vc, false);
1da177e4
LT		 847 hide_softcursor(vc);
848}
849
850static void set_cursor(struct vc_data *vc)
851{
6ca8dfd7 852 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 853 return;
854 if (vc->vc_deccm) {
dce05aa6 855 if (vc_is_sel(vc))
1da177e4
LT		 856 clear_selection();
857 add_softcursor(vc);
c0e4b3ad 858 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
a292e3fc 859 vc->vc_sw->con_cursor(vc, true);
1da177e4
LT		 860 } else
861 hide_cursor(vc);
862}
863
864static void set_origin(struct vc_data *vc)
865{
866 WARN_CONSOLE_UNLOCKED();
867
6ca8dfd7 868 if (!con_is_visible(vc) ||
1da177e4
LT		 869 !vc->vc_sw->con_set_origin ||
870 !vc->vc_sw->con_set_origin(vc))
871 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
872 vc->vc_visible_origin = vc->vc_origin;
873 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
28bc24fc
JS		 874 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
875 2 * vc->state.x;
1da177e4
LT		 876}
877
c0f160a7 878static void save_screen(struct vc_data *vc)
1da177e4
LT		 879{
880 WARN_CONSOLE_UNLOCKED();
881
882 if (vc->vc_sw->con_save_screen)
883 vc->vc_sw->con_save_screen(vc);
884}
885
bcd375f7
MS		 886static void flush_scrollback(struct vc_data *vc)
887{
888 WARN_CONSOLE_UNLOCKED();
889
a6dbe442 890 set_origin(vc);
b23bf1a4
JSS		 891 if (!con_is_visible(vc))
892 return;
893
894 /*
895 * The legacy way for flushing the scrollback buffer is to use a side
896 * effect of the con_switch method. We do it only on the foreground
897 * console as background consoles have no scrollback buffers in that
898 * case and we obviously don't want to switch to them.
899 */
900 hide_cursor(vc);
901 vc->vc_sw->con_switch(vc);
902 set_cursor(vc);
bcd375f7
MS		 903}
904
1da177e4
LT		 905/*
906 * Redrawing of screen
907 */
908
2a248307 909void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 910{
911 unsigned short *p = (unsigned short *)vc->vc_origin;
912 int count = vc->vc_screenbuf_size / 2;
913 int mask = vc->vc_hi_font_mask | 0xff;
914
915 for (; count > 0; count--, p++) {
916 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
917 }
918}
919
920void redraw_screen(struct vc_data *vc, int is_switch)
921{
922 int redraw = 0;
923
924 WARN_CONSOLE_UNLOCKED();
925
926 if (!vc) {
927 /* strange ... */
928 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
929 return;
930 }
931
932 if (is_switch) {
933 struct vc_data *old_vc = vc_cons[fg_console].d;
934 if (old_vc == vc)
935 return;
6ca8dfd7 936 if (!con_is_visible(vc))
1da177e4
LT		 937 redraw = 1;
938 *vc->vc_display_fg = vc;
939 fg_console = vc->vc_num;
940 hide_cursor(old_vc);
6ca8dfd7 941 if (!con_is_visible(old_vc)) {
1da177e4
LT		 942 save_screen(old_vc);
943 set_origin(old_vc);
944 }
fbc92a34
KS		 945 if (tty0dev)
946 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 947 } else {
948 hide_cursor(vc);
949 redraw = 1;
950 }
951
952 if (redraw) {
8d5cc8ee 953 bool update;
1da177e4
LT		 954 int old_was_color = vc->vc_can_do_color;
955
956 set_origin(vc);
957 update = vc->vc_sw->con_switch(vc);
958 set_palette(vc);
959 /*
960 * If console changed from mono<->color, the best we can do
961 * is to clear the buffer attributes. As it currently stands,
962 * rebuilding new attributes from the old buffer is not doable
963 * without overly complex code.
964 */
965 if (old_was_color != vc->vc_can_do_color) {
966 update_attr(vc);
967 clear_buffer_attributes(vc);
968 }
8fd4bd22 969
8d7fc299 970 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 971 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
972 }
973 set_cursor(vc);
974 if (is_switch) {
63f24a7f 975 vt_set_leds_compute_shiftstate();
8182ec49 976 notify_update(vc);
1da177e4
LT		 977 }
978}
921234d7 979EXPORT_SYMBOL(redraw_screen);
1da177e4
LT		 980
981/*
982 * Allocation, freeing and resizing of VTs.
983 */
984
985int vc_cons_allocated(unsigned int i)
986{
987 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
988}
989
dae3e6b6 990static void visual_init(struct vc_data *vc, int num, bool init)
1da177e4
LT		 991{
992 /* ++Geert: vc->vc_sw->con_init determines console size */
993 if (vc->vc_sw)
994 module_put(vc->vc_sw->owner);
995 vc->vc_sw = conswitchp;
f91cf1a3 996
1da177e4
LT		 997 if (con_driver_map[num])
998 vc->vc_sw = con_driver_map[num];
f91cf1a3 999
1da177e4
LT		 1000 __module_get(vc->vc_sw->owner);
1001 vc->vc_num = num;
1002 vc->vc_display_fg = &master_display_fg;
8da443b1 1003 if (vc->uni_pagedict_loc)
08b33249 1004 con_free_unimap(vc);
8da443b1
JS		 1005 vc->uni_pagedict_loc = &vc->uni_pagedict;
1006 vc->uni_pagedict = NULL;
1da177e4
LT		 1007 vc->vc_hi_font_mask = 0;
1008 vc->vc_complement_mask = 0;
1009 vc->vc_can_do_color = 0;
1b45996d 1010 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1011 vc->vc_sw->con_init(vc, init);
1012 if (!vc->vc_complement_mask)
1013 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1014 vc->vc_s_complement_mask = vc->vc_complement_mask;
1015 vc->vc_size_row = vc->vc_cols << 1;
1016 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1017}
1018
a1ad1cc9
GH		 1019
1020static void visual_deinit(struct vc_data *vc)
1021{
1022 vc->vc_sw->con_deinit(vc);
1023 module_put(vc->vc_sw->owner);
1024}
1025
ca4463bf
EB		 1026static void vc_port_destruct(struct tty_port *port)
1027{
1028 struct vc_data *vc = container_of(port, struct vc_data, port);
1029
1030 kfree(vc);
1031}
1032
1033static const struct tty_port_operations vc_port_ops = {
1034 .destruct = vc_port_destruct,
1035};
1036
ce684552
TH		 1037/*
1038 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1039 * [this is to be used together with some user program
1040 * like resize that changes the hardware videomode]
1041 */
1042#define VC_MAXCOL (32767)
1043#define VC_MAXROW (32767)
1044
1da177e4
LT		 1045int vc_allocate(unsigned int currcons) /* return 0 on success */
1046{
34902b7f
JS		 1047 struct vt_notifier_param param;
1048 struct vc_data *vc;
ce684552 1049 int err;
34902b7f 1050
1da177e4
LT		 1051 WARN_CONSOLE_UNLOCKED();
1052
1053 if (currcons >= MAX_NR_CONSOLES)
1054 return -ENXIO;
34902b7f
JS		 1055
1056 if (vc_cons[currcons].d)
1057 return 0;
1058
1059 /* due to the granularity of kmalloc, we waste some memory here */
1060 /* the alloc is done in two steps, to optimize the common situation
1061 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1062 /* although the numbers above are not valid since long ago, the
1063 point is still up-to-date and the comment still has its value
1064 even if only as a historical artifact. --mj, July 1998 */
1065 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1066 if (!vc)
1da177e4 1067 return -ENOMEM;
34902b7f
JS		 1068
1069 vc_cons[currcons].d = vc;
1070 tty_port_init(&vc->port);
ca4463bf 1071 vc->port.ops = &vc_port_ops;
34902b7f
JS		 1072 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1073
dae3e6b6 1074 visual_init(vc, currcons, true);
34902b7f 1075
8da443b1 1076 if (!*vc->uni_pagedict_loc)
1da177e4 1077 con_set_default_unimap(vc);
f6c06b68 1078
ce684552
TH		 1079 err = -EINVAL;
1080 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1081 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1082 goto err_free;
1083 err = -ENOMEM;
21eff69a 1084 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1085 if (!vc->vc_screenbuf)
1086 goto err_free;
1087
1088 /* If no drivers have overridden us and the user didn't pass a
1089 boot option, default to displaying the cursor */
1090 if (global_cursor_default == -1)
1091 global_cursor_default = 1;
1092
f68279ca 1093 vc_init(vc, 1);
34902b7f
JS		 1094 vcs_make_sysfs(currcons);
1095 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1096
1da177e4 1097 return 0;
34902b7f 1098err_free:
a1ad1cc9 1099 visual_deinit(vc);
34902b7f
JS		 1100 kfree(vc);
1101 vc_cons[currcons].d = NULL;
ce684552 1102 return err;
1da177e4
LT		 1103}
1104
e400b6ec 1105static inline int resize_screen(struct vc_data *vc, int width, int height,
beccdcfa 1106 bool from_user)
1da177e4
LT		 1107{
1108 /* Resizes the resolution of the display adapater */
1109 int err = 0;
1110
ffb324e6 1111 if (vc->vc_sw->con_resize)
beccdcfa 1112 err = vc->vc_sw->con_resize(vc, width, height, from_user);
e400b6ec 1113
1da177e4
LT		 1114 return err;
1115}
1116
8c9a9dd0 1117/**
60234365
JSS		 1118 * vc_do_resize - resizing method for the tty
1119 * @tty: tty being resized
1120 * @vc: virtual console private data
1121 * @cols: columns
1122 * @lines: lines
1123 * @from_user: invoked by a user?
8c9a9dd0 1124 *
60234365
JSS		 1125 * Resize a virtual console, clipping according to the actual constraints. If
1126 * the caller passes a tty structure then update the termios winsize
1127 * information and perform any necessary signal handling.
8c9a9dd0 1128 *
60234365
JSS		 1129 * Locking: Caller must hold the console semaphore. Takes the termios rwsem and
1130 * ctrl.lock of the tty IFF a tty is passed.
8c9a9dd0 1131 */
fc6f6238 1132static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
beccdcfa 1133 unsigned int cols, unsigned int lines, bool from_user)
1da177e4
LT		 1134{
1135 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1136 unsigned long end;
d8ae7242 1137 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1138 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
f8d1653d 1139 unsigned short *oldscreen, *newscreen;
feb36abb 1140 u32 **new_uniscr = NULL;
1da177e4
LT		 1141
1142 WARN_CONSOLE_UNLOCKED();
1143
ce684552 1144 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1da177e4
LT		 1145 return -EINVAL;
1146
1147 new_cols = (cols ? cols : vc->vc_cols);
1148 new_rows = (lines ? lines : vc->vc_rows);
1149 new_row_size = new_cols << 1;
1150 new_screen_size = new_row_size * new_rows;
1151
3b0c4061
IMAT		 1152 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1153 /*
1154 * This function is being called here to cover the case
1155 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1156 * passing the same fb_var_screeninfo containing the fields
1157 * yres/xres equal to a number non-multiple of vc_font.height
1158 * and yres_virtual/xres_virtual equal to number lesser than the
1159 * vc_font.height and yres/xres.
1160 * In the second call, the struct fb_var_screeninfo isn't
1161 * being modified by the underlying driver because of the
1162 * if above, and this causes the fbcon_display->vrows to become
1163 * negative and it eventually leads to out-of-bound
1164 * access by the imageblit function.
1165 * To give the correct values to the struct and to not have
1166 * to deal with possible errors from the code below, we call
1167 * the resize_screen here as well.
1168 */
beccdcfa 1169 return resize_screen(vc, new_cols, new_rows, from_user);
3b0c4061 1170 }
1da177e4 1171
ce684552 1172 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
32b2921e 1173 return -EINVAL;
21eff69a 1174 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1175 if (!newscreen)
1176 return -ENOMEM;
1177
feb36abb 1178 if (vc->vc_uni_lines) {
d8ae7242
NP		 1179 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1180 if (!new_uniscr) {
1181 kfree(newscreen);
1182 return -ENOMEM;
1183 }
1184 }
1185
dce05aa6 1186 if (vc_is_sel(vc))
009e39ae
SD		 1187 clear_selection();
1188
1da177e4 1189 old_rows = vc->vc_rows;
1da177e4 1190 old_row_size = vc->vc_size_row;
1da177e4 1191
beccdcfa 1192 err = resize_screen(vc, new_cols, new_rows, from_user);
1da177e4
LT		 1193 if (err) {
1194 kfree(newscreen);
57d38f26 1195 vc_uniscr_free(new_uniscr);
1da177e4
LT		 1196 return err;
1197 }
1198
1199 vc->vc_rows = new_rows;
1200 vc->vc_cols = new_cols;
1201 vc->vc_size_row = new_row_size;
1202 vc->vc_screenbuf_size = new_screen_size;
1203
1204 rlth = min(old_row_size, new_row_size);
1205 rrem = new_row_size - rlth;
1206 old_origin = vc->vc_origin;
1207 new_origin = (long) newscreen;
1208 new_scr_end = new_origin + new_screen_size;
3b41dc1a 1209
28bc24fc
JS		 1210 if (vc->state.y > new_rows) {
1211 if (old_rows - vc->state.y < new_rows) {
3b41dc1a
AD		 1212 /*
1213 * Cursor near the bottom, copy contents from the
1214 * bottom of buffer
1215 */
d8ae7242 1216 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1217 } else {
1218 /*
1219 * Cursor is in no man's land, copy 1/2 screenful
1220 * from the top and bottom of cursor position
1221 */
28bc24fc 1222 first_copied_row = (vc->state.y - new_rows/2);
3b41dc1a 1223 }
d8ae7242
NP		 1224 old_origin += first_copied_row * old_row_size;
1225 } else
1226 first_copied_row = 0;
9fc2b2d0 1227 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1228
d8ae7242 1229 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
feb36abb 1230 vc->vc_uni_lines, rlth/2, first_copied_row,
d8ae7242
NP		 1231 min(old_rows, new_rows));
1232 vc_uniscr_set(vc, new_uniscr);
1233
1da177e4
LT		 1234 update_attr(vc);
1235
3b41dc1a
AD		 1236 while (old_origin < end) {
1237 scr_memcpyw((unsigned short *) new_origin,
1238 (unsigned short *) old_origin, rlth);
1da177e4 1239 if (rrem)
3b41dc1a
AD		 1240 scr_memsetw((void *)(new_origin + rlth),
1241 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1242 old_origin += old_row_size;
1243 new_origin += new_row_size;
1244 }
1245 if (new_scr_end > new_origin)
3b41dc1a
AD		 1246 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1247 new_scr_end - new_origin);
f8d1653d 1248 oldscreen = vc->vc_screenbuf;
1da177e4 1249 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1250 vc->vc_screenbuf_size = new_screen_size;
1251 set_origin(vc);
f8d1653d 1252 kfree(oldscreen);
1da177e4
LT		 1253
1254 /* do part of a reset_terminal() */
1255 vc->vc_top = 0;
1256 vc->vc_bottom = vc->vc_rows;
28bc24fc 1257 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 1258 save_cur(vc);
1259
8c9a9dd0
AC		 1260 if (tty) {
1261 /* Rewrite the requested winsize data with the actual
1262 resulting sizes */
1263 struct winsize ws;
1da177e4
LT		 1264 memset(&ws, 0, sizeof(ws));
1265 ws.ws_row = vc->vc_rows;
1266 ws.ws_col = vc->vc_cols;
1267 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1268 tty_do_resize(tty, &ws);
1da177e4
LT		 1269 }
1270
6ca8dfd7 1271 if (con_is_visible(vc))
1da177e4 1272 update_screen(vc);
8b92e87d 1273 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1274 notify_update(vc);
1da177e4
LT		 1275 return err;
1276}
1277
8c9a9dd0 1278/**
60234365
JSS		 1279 * __vc_resize - resize a VT
1280 * @vc: virtual console
1281 * @cols: columns
1282 * @rows: rows
1283 * @from_user: invoked by a user?
1284 *
1285 * Resize a virtual console as seen from the console end of things. We use the
1286 * common vc_do_resize() method to update the structures.
8c9a9dd0 1287 *
60234365
JSS		 1288 * Locking: The caller must hold the console sem to protect console internals
1289 * and @vc->port.tty.
8c9a9dd0 1290 */
beccdcfa
JSS		 1291int __vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows,
1292 bool from_user)
8c9a9dd0 1293{
beccdcfa 1294 return vc_do_resize(vc->port.tty, vc, cols, rows, from_user);
8c9a9dd0 1295}
beccdcfa 1296EXPORT_SYMBOL(__vc_resize);
8c9a9dd0
AC		 1297
1298/**
60234365
JSS		 1299 * vt_resize - resize a VT
1300 * @tty: tty to resize
1301 * @ws: winsize attributes
8c9a9dd0 1302 *
60234365
JSS		 1303 * Resize a virtual terminal. This is called by the tty layer as we register
1304 * our own handler for resizing. The mutual helper does all the actual work.
8c9a9dd0 1305 *
60234365
JSS		 1306 * Locking: Takes the console sem and the called methods then take the tty
1307 * termios_rwsem and the tty ctrl.lock in that order.
8c9a9dd0 1308 */
da2bdf9a 1309static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1310{
8c9a9dd0
AC		 1311 struct vc_data *vc = tty->driver_data;
1312 int ret;
ca9bda00 1313
ac751efa 1314 console_lock();
beccdcfa 1315 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row, false);
ac751efa 1316 console_unlock();
8c9a9dd0 1317 return ret;
ca9bda00 1318}
1da177e4 1319
421b40a6 1320struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1321{
421b40a6
PH		 1322 struct vc_data *vc = NULL;
1323
1da177e4
LT		 1324 WARN_CONSOLE_UNLOCKED();
1325
1326 if (vc_cons_allocated(currcons)) {
421b40a6 1327 struct vt_notifier_param param;
4995f8ef 1328
421b40a6 1329 param.vc = vc = vc_cons[currcons].d;
b293d758 1330 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1331 vcs_remove_sysfs(currcons);
a1ad1cc9 1332 visual_deinit(vc);
211b4d42 1333 con_free_unimap(vc);
bde0d2c9 1334 put_pid(vc->vt_pid);
d8ae7242 1335 vc_uniscr_set(vc, NULL);
5c9228f0 1336 kfree(vc->vc_screenbuf);
1da177e4
LT		 1337 vc_cons[currcons].d = NULL;
1338 }
421b40a6 1339 return vc;
1da177e4
LT		 1340}
1341
1342/*
1343 * VT102 emulator
1344 */
1345
2ff5c5a1
MH		 1346enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1347
079c9534
AC		 1348#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1349#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1350#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1351
1352#define decarm VC_REPEAT
1353#define decckm VC_CKMODE
1354#define kbdapplic VC_APPLIC
1355#define lnm VC_CRLF
1356
8ede5cce 1357const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4 1358 8,12,10,14, 9,13,11,15 };
921234d7 1359EXPORT_SYMBOL(color_table);
1da177e4
LT		 1360
1361/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1362unsigned char default_red[] = {
1363 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1364 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1365};
1366module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
921234d7 1367EXPORT_SYMBOL(default_red);
91e74ca5
JS		 1368
1369unsigned char default_grn[] = {
1370 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1371 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1372};
1373module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
921234d7 1374EXPORT_SYMBOL(default_grn);
91e74ca5
JS		 1375
1376unsigned char default_blu[] = {
1377 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1378 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1379};
1380module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
921234d7 1381EXPORT_SYMBOL(default_blu);
1c2bbe6a 1382
1da177e4
LT		 1383/*
1384 * gotoxy() must verify all boundaries, because the arguments
1385 * might also be negative. If the given position is out of
1386 * bounds, the cursor is placed at the nearest margin.
1387 */
1388static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1389{
1390 int min_y, max_y;
1391
1392 if (new_x < 0)
28bc24fc 1393 vc->state.x = 0;
1da177e4
LT		 1394 else {
1395 if (new_x >= vc->vc_cols)
28bc24fc 1396 vc->state.x = vc->vc_cols - 1;
1da177e4 1397 else
28bc24fc 1398 vc->state.x = new_x;
1da177e4
LT		 1399 }
1400
1401 if (vc->vc_decom) {
1402 min_y = vc->vc_top;
1403 max_y = vc->vc_bottom;
1404 } else {
1405 min_y = 0;
1406 max_y = vc->vc_rows;
1407 }
1408 if (new_y < min_y)
28bc24fc 1409 vc->state.y = min_y;
1da177e4 1410 else if (new_y >= max_y)
28bc24fc 1411 vc->state.y = max_y - 1;
1da177e4 1412 else
28bc24fc
JS		 1413 vc->state.y = new_y;
1414 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1415 (vc->state.x << 1);
1da177e4
LT		 1416 vc->vc_need_wrap = 0;
1417}
1418
1419/* for absolute user moves, when decom is set */
1420static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1421{
1422 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1423}
1424
1b0ec88a 1425void scrollback(struct vc_data *vc)
1da177e4 1426{
1b0ec88a 1427 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1428}
1429
1430void scrollfront(struct vc_data *vc, int lines)
1431{
1432 if (!lines)
1433 lines = vc->vc_rows / 2;
1434 scrolldelta(lines);
1435}
1436
1437static void lf(struct vc_data *vc)
1438{
1439 /* don't scroll if above bottom of scrolling region, or
1440 * if below scrolling region
1441 */
28bc24fc 1442 if (vc->state.y + 1 == vc->vc_bottom)
89765b94 1443 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
28bc24fc
JS		 1444 else if (vc->state.y < vc->vc_rows - 1) {
1445 vc->state.y++;
1da177e4
LT		 1446 vc->vc_pos += vc->vc_size_row;
1447 }
1448 vc->vc_need_wrap = 0;
b293d758 1449 notify_write(vc, '\n');
1da177e4
LT		 1450}
1451
1452static void ri(struct vc_data *vc)
1453{
1454 /* don't scroll if below top of scrolling region, or
1455 * if above scrolling region
1456 */
28bc24fc 1457 if (vc->state.y == vc->vc_top)
89765b94 1458 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
28bc24fc
JS		 1459 else if (vc->state.y > 0) {
1460 vc->state.y--;
1da177e4
LT		 1461 vc->vc_pos -= vc->vc_size_row;
1462 }
1463 vc->vc_need_wrap = 0;
1464}
1465
1466static inline void cr(struct vc_data *vc)
1467{
28bc24fc
JS		 1468 vc->vc_pos -= vc->state.x << 1;
1469 vc->vc_need_wrap = vc->state.x = 0;
b293d758 1470 notify_write(vc, '\r');
1da177e4
LT		 1471}
1472
1473static inline void bs(struct vc_data *vc)
1474{
28bc24fc 1475 if (vc->state.x) {
1da177e4 1476 vc->vc_pos -= 2;
28bc24fc 1477 vc->state.x--;
1da177e4 1478 vc->vc_need_wrap = 0;
b293d758 1479 notify_write(vc, '\b');
1da177e4
LT		 1480 }
1481}
1482
1483static inline void del(struct vc_data *vc)
1484{
1485 /* ignored */
1486}
1487
4b8f9361
JSS		 1488enum CSI_J {
1489 CSI_J_CURSOR_TO_END = 0,
1490 CSI_J_START_TO_CURSOR = 1,
1491 CSI_J_VISIBLE = 2,
1492 CSI_J_FULL = 3,
1493};
1494
1495static void csi_J(struct vc_data *vc, enum CSI_J vpar)
1da177e4 1496{
fe4f6beb 1497 unsigned short *start;
1da177e4 1498 unsigned int count;
1da177e4
LT		 1499
1500 switch (vpar) {
fe4f6beb
JSS		 1501 case CSI_J_CURSOR_TO_END:
1502 vc_uniscr_clear_line(vc, vc->state.x,
1503 vc->vc_cols - vc->state.x);
1504 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1505 vc->vc_rows - vc->state.y - 1);
1506 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1507 start = (unsigned short *)vc->vc_pos;
1508 break;
1509 case CSI_J_START_TO_CURSOR:
1510 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1511 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1512 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1513 start = (unsigned short *)vc->vc_origin;
1514 break;
1515 case CSI_J_FULL:
1516 flush_scrollback(vc);
1517 fallthrough;
1518 case CSI_J_VISIBLE:
1519 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1520 count = vc->vc_cols * vc->vc_rows;
1521 start = (unsigned short *)vc->vc_origin;
1522 break;
1523 default:
1524 return;
1da177e4
LT		 1525 }
1526 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
b2ecf006
MP		 1527 if (con_should_update(vc))
1528 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1529 vc->vc_need_wrap = 0;
1530}
1531
7eb38a76
JSS		 1532enum {
1533 CSI_K_CURSOR_TO_LINEEND = 0,
1534 CSI_K_LINESTART_TO_CURSOR = 1,
1535 CSI_K_LINE = 2,
1536};
1537
8e6bd49a 1538static void csi_K(struct vc_data *vc)
1da177e4
LT		 1539{
1540 unsigned int count;
d8ae7242
NP		 1541 unsigned short *start = (unsigned short *)vc->vc_pos;
1542 int offset;
1da177e4 1543
8e6bd49a 1544 switch (vc->vc_par[0]) {
23672a57
JSS		 1545 case CSI_K_CURSOR_TO_LINEEND:
1546 offset = 0;
1547 count = vc->vc_cols - vc->state.x;
1548 break;
1549 case CSI_K_LINESTART_TO_CURSOR:
1550 offset = -vc->state.x;
1551 count = vc->state.x + 1;
1552 break;
1553 case CSI_K_LINE:
1554 offset = -vc->state.x;
1555 count = vc->vc_cols;
1556 break;
1557 default:
1558 return;
1da177e4 1559 }
28bc24fc 1560 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
d8ae7242 1561 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1562 vc->vc_need_wrap = 0;
6ca8dfd7 1563 if (con_should_update(vc))
943210ba 1564 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1565}
1566
8e6bd49a
JSS		 1567/* erase the following count positions */
1568static void csi_X(struct vc_data *vc)
1da177e4 1569{ /* not vt100? */
8e6bd49a 1570 unsigned int count = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
1da177e4 1571
28bc24fc 1572 vc_uniscr_clear_line(vc, vc->state.x, count);
1da177e4 1573 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1574 if (con_should_update(vc))
559f01a0 1575 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, count);
1da177e4
LT		 1576 vc->vc_need_wrap = 0;
1577}
1578
1579static void default_attr(struct vc_data *vc)
1580{
b84ae3dc 1581 vc->state.intensity = VCI_NORMAL;
77bc14f2
JS		 1582 vc->state.italic = false;
1583 vc->state.underline = false;
1584 vc->state.reverse = false;
1585 vc->state.blink = false;
28bc24fc 1586 vc->state.color = vc->vc_def_color;
1da177e4
LT		 1587}
1588
cec5b2a9
AB		 1589struct rgb { u8 r; u8 g; u8 b; };
1590
fb8fa909 1591static void rgb_from_256(unsigned int i, struct rgb *c)
cec5b2a9 1592{
cec5b2a9 1593 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1594 c->r = i&1 ? 0xaa : 0x00;
1595 c->g = i&2 ? 0xaa : 0x00;
1596 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1597 } else if (i < 16) {
0f91e142
JS		 1598 c->r = i&1 ? 0xff : 0x55;
1599 c->g = i&2 ? 0xff : 0x55;
1600 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1601 } else if (i < 232) { /* 6x6x6 colour cube. */
fb8fa909
JSS		 1602 i -= 16;
1603 c->b = i % 6 * 255 / 6;
1604 i /= 6;
1605 c->g = i % 6 * 255 / 6;
1606 i /= 6;
1607 c->r = i * 255 / 6;
cec5b2a9 1608 } else /* Grayscale ramp. */
0f91e142 1609 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1610}
1611
0f91e142 1612static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1613{
193df022
JS		 1614 u8 hue = 0, max = max3(c->r, c->g, c->b);
1615
1616 if (c->r > max / 2)
1617 hue |= 4;
1618 if (c->g > max / 2)
1619 hue |= 2;
1620 if (c->b > max / 2)
1621 hue |= 1;
1622
1623 if (hue == 7 && max <= 0x55) {
1624 hue = 0;
b84ae3dc 1625 vc->state.intensity = VCI_BOLD;
193df022 1626 } else if (max > 0xaa)
b84ae3dc 1627 vc->state.intensity = VCI_BOLD;
cec5b2a9 1628 else
b84ae3dc 1629 vc->state.intensity = VCI_NORMAL;
193df022 1630
28bc24fc 1631 vc->state.color = (vc->state.color & 0xf0) | hue;
cec5b2a9
AB		 1632}
1633
0f91e142 1634static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1635{
1636 /* For backgrounds, err on the dark side. */
28bc24fc 1637 vc->state.color = (vc->state.color & 0x0f)
0f91e142 1638 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1639}
1640
e05ab238
JS		 1641/*
1642 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1643 * and thus need to be detected and ignored by hand. That standard also
1644 * wants : rather than ; as separators but sequences containing : are currently
1645 * completely ignored by the parser.
e05ab238
JS		 1646 *
1647 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1648 * supporting them.
1649 */
1650static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1651 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1652{
0f91e142
JS		 1653 struct rgb c;
1654
e05ab238
JS		 1655 i++;
1656 if (i > vc->vc_npar)
1657 return i;
1658
0bf1f4a8 1659 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1660 /* 256 colours */
e05ab238 1661 i++;
0f91e142 1662 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1663 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1664 /* 24 bit */
0f91e142
JS		 1665 c.r = vc->vc_par[i + 1];
1666 c.g = vc->vc_par[i + 2];
1667 c.b = vc->vc_par[i + 3];
e05ab238 1668 i += 3;
0f91e142
JS		 1669 } else
1670 return i;
1671
1672 set_color(vc, &c);
e05ab238
JS		 1673
1674 return i;
1675}
1676
09e7f9f6
JSS		 1677enum {
1678 CSI_m_DEFAULT = 0,
1679 CSI_m_BOLD = 1,
1680 CSI_m_HALF_BRIGHT = 2,
1681 CSI_m_ITALIC = 3,
1682 CSI_m_UNDERLINE = 4,
1683 CSI_m_BLINK = 5,
1684 CSI_m_REVERSE = 7,
1685 CSI_m_PRI_FONT = 10,
1686 CSI_m_ALT_FONT1 = 11,
1687 CSI_m_ALT_FONT2 = 12,
1688 CSI_m_DOUBLE_UNDERLINE = 21,
1689 CSI_m_NORMAL_INTENSITY = 22,
1690 CSI_m_NO_ITALIC = 23,
1691 CSI_m_NO_UNDERLINE = 24,
1692 CSI_m_NO_BLINK = 25,
1693 CSI_m_NO_REVERSE = 27,
1694 CSI_m_FG_COLOR_BEG = 30,
1695 CSI_m_FG_COLOR_END = 37,
1696 CSI_m_FG_COLOR = 38,
1697 CSI_m_DEFAULT_FG_COLOR = 39,
1698 CSI_m_BG_COLOR_BEG = 40,
1699 CSI_m_BG_COLOR_END = 47,
1700 CSI_m_BG_COLOR = 48,
1701 CSI_m_DEFAULT_BG_COLOR = 49,
1702 CSI_m_BRIGHT_FG_COLOR_BEG = 90,
1703 CSI_m_BRIGHT_FG_COLOR_END = 97,
1704 CSI_m_BRIGHT_FG_COLOR_OFF = CSI_m_BRIGHT_FG_COLOR_BEG - CSI_m_FG_COLOR_BEG,
1705 CSI_m_BRIGHT_BG_COLOR_BEG = 100,
1706 CSI_m_BRIGHT_BG_COLOR_END = 107,
1707 CSI_m_BRIGHT_BG_COLOR_OFF = CSI_m_BRIGHT_BG_COLOR_BEG - CSI_m_BG_COLOR_BEG,
1708};
1709
ac751efa 1710/* console_lock is held */
1da177e4
LT		 1711static void csi_m(struct vc_data *vc)
1712{
1713 int i;
1714
1715 for (i = 0; i <= vc->vc_npar; i++)
1716 switch (vc->vc_par[i]) {
09e7f9f6 1717 case CSI_m_DEFAULT: /* all attributes off */
aada0a34
JS		 1718 default_attr(vc);
1719 break;
09e7f9f6 1720 case CSI_m_BOLD:
b84ae3dc 1721 vc->state.intensity = VCI_BOLD;
aada0a34 1722 break;
09e7f9f6 1723 case CSI_m_HALF_BRIGHT:
b84ae3dc 1724 vc->state.intensity = VCI_HALF_BRIGHT;
aada0a34 1725 break;
09e7f9f6 1726 case CSI_m_ITALIC:
77bc14f2 1727 vc->state.italic = true;
aada0a34 1728 break;
09e7f9f6 1729 case CSI_m_DOUBLE_UNDERLINE:
65d9982d
MF		 1730 /*
1731 * No console drivers support double underline, so
1732 * convert it to a single underline.
1733 */
09e7f9f6 1734 case CSI_m_UNDERLINE:
77bc14f2 1735 vc->state.underline = true;
aada0a34 1736 break;
09e7f9f6 1737 case CSI_m_BLINK:
77bc14f2 1738 vc->state.blink = true;
aada0a34 1739 break;
09e7f9f6 1740 case CSI_m_REVERSE:
77bc14f2 1741 vc->state.reverse = true;
aada0a34 1742 break;
09e7f9f6 1743 case CSI_m_PRI_FONT: /* ANSI X3.64-1979 (SCO-ish?)
aada0a34
JS		 1744 * Select primary font, don't display control chars if
1745 * defined, don't set bit 8 on output.
1746 */
b70ec4d9 1747 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
aada0a34
JS		 1748 vc->vc_disp_ctrl = 0;
1749 vc->vc_toggle_meta = 0;
1750 break;
09e7f9f6 1751 case CSI_m_ALT_FONT1: /* ANSI X3.64-1979 (SCO-ish?)
aada0a34
JS		 1752 * Select first alternate font, lets chars < 32 be
1753 * displayed as ROM chars.
1754 */
1755 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1756 vc->vc_disp_ctrl = 1;
1757 vc->vc_toggle_meta = 0;
1758 break;
09e7f9f6 1759 case CSI_m_ALT_FONT2: /* ANSI X3.64-1979 (SCO-ish?)
aada0a34
JS		 1760 * Select second alternate font, toggle high bit
1761 * before displaying as ROM char.
1762 */
1763 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1764 vc->vc_disp_ctrl = 1;
1765 vc->vc_toggle_meta = 1;
1766 break;
09e7f9f6 1767 case CSI_m_NORMAL_INTENSITY:
b84ae3dc 1768 vc->state.intensity = VCI_NORMAL;
aada0a34 1769 break;
09e7f9f6 1770 case CSI_m_NO_ITALIC:
77bc14f2 1771 vc->state.italic = false;
aada0a34 1772 break;
09e7f9f6 1773 case CSI_m_NO_UNDERLINE:
77bc14f2 1774 vc->state.underline = false;
aada0a34 1775 break;
09e7f9f6 1776 case CSI_m_NO_BLINK:
77bc14f2 1777 vc->state.blink = false;
aada0a34 1778 break;
09e7f9f6 1779 case CSI_m_NO_REVERSE:
77bc14f2 1780 vc->state.reverse = false;
aada0a34 1781 break;
09e7f9f6 1782 case CSI_m_FG_COLOR:
aada0a34
JS		 1783 i = vc_t416_color(vc, i, rgb_foreground);
1784 break;
09e7f9f6 1785 case CSI_m_BG_COLOR:
aada0a34
JS		 1786 i = vc_t416_color(vc, i, rgb_background);
1787 break;
09e7f9f6 1788 case CSI_m_DEFAULT_FG_COLOR:
28bc24fc
JS		 1789 vc->state.color = (vc->vc_def_color & 0x0f) |
1790 (vc->state.color & 0xf0);
aada0a34 1791 break;
09e7f9f6 1792 case CSI_m_DEFAULT_BG_COLOR:
28bc24fc
JS		 1793 vc->state.color = (vc->vc_def_color & 0xf0) |
1794 (vc->state.color & 0x0f);
aada0a34 1795 break;
76ec3a7a
JSS		 1796 case CSI_m_BRIGHT_FG_COLOR_BEG ... CSI_m_BRIGHT_FG_COLOR_END:
1797 vc->state.intensity = VCI_BOLD;
1798 vc->vc_par[i] -= CSI_m_BRIGHT_FG_COLOR_OFF;
1799 fallthrough;
1800 case CSI_m_FG_COLOR_BEG ... CSI_m_FG_COLOR_END:
1801 vc->vc_par[i] -= CSI_m_FG_COLOR_BEG;
1802 vc->state.color = color_table[vc->vc_par[i]] |
1803 (vc->state.color & 0xf0);
1804 break;
1805 case CSI_m_BRIGHT_BG_COLOR_BEG ... CSI_m_BRIGHT_BG_COLOR_END:
1806 vc->vc_par[i] -= CSI_m_BRIGHT_BG_COLOR_OFF;
1807 fallthrough;
1808 case CSI_m_BG_COLOR_BEG ... CSI_m_BG_COLOR_END:
1809 vc->vc_par[i] -= CSI_m_BG_COLOR_BEG;
1810 vc->state.color = (color_table[vc->vc_par[i]] << 4) |
1811 (vc->state.color & 0x0f);
aada0a34 1812 break;
1da177e4
LT		 1813 }
1814 update_attr(vc);
1815}
1816
de53ce04 1817static void respond_string(const char *p, size_t len, struct tty_port *port)
1da177e4 1818{
de53ce04 1819 tty_insert_flip_string(port, p, len);
5f6a8515 1820 tty_flip_buffer_push(port);
1da177e4
LT		 1821}
1822
1823static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1824{
1825 char buf[40];
de53ce04 1826 int len;
1da177e4 1827
de53ce04
JS		 1828 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1829 (vc->vc_decom ? vc->vc_top + 1 : 1),
1830 vc->state.x + 1);
1831 respond_string(buf, len, tty->port);
1da177e4
LT		 1832}
1833
1834static inline void status_report(struct tty_struct *tty)
1835{
de53ce04
JS		 1836 static const char teminal_ok[] = "\033[0n";
1837
1838 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1da177e4
LT		 1839}
1840
6732c8bb 1841static inline void respond_ID(struct tty_struct *tty)
1da177e4 1842{
9a6f72d9
JS		 1843 /* terminal answer to an ESC-Z or csi0c query. */
1844 static const char vt102_id[] = "\033[?6c";
1845
1846 respond_string(vt102_id, strlen(vt102_id), tty->port);
1da177e4
LT		 1847}
1848
1849void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1850{
1851 char buf[8];
de53ce04 1852 int len;
1da177e4 1853
de53ce04
JS		 1854 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1855 (char)('!' + mrx), (char)('!' + mry));
1856 respond_string(buf, len, tty->port);
1da177e4
LT		 1857}
1858
496124e5 1859/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1da177e4
LT		 1860int mouse_reporting(void)
1861{
1862 return vc_cons[fg_console].d->vc_report_mouse;
1863}
1864
608053e1
JSS		 1865enum {
1866 CSI_DEC_hl_CURSOR_KEYS = 1, /* CKM: cursor keys send ^[Ox/^[[x */
1867 CSI_DEC_hl_132_COLUMNS = 3, /* COLM: 80/132 mode switch */
1868 CSI_DEC_hl_REVERSE_VIDEO = 5, /* SCNM */
1869 CSI_DEC_hl_ORIGIN_MODE = 6, /* OM: origin relative/absolute */
1870 CSI_DEC_hl_AUTOWRAP = 7, /* AWM */
1871 CSI_DEC_hl_AUTOREPEAT = 8, /* ARM */
1872 CSI_DEC_hl_MOUSE_X10 = 9,
1873 CSI_DEC_hl_SHOW_CURSOR = 25, /* TCEM */
1874 CSI_DEC_hl_MOUSE_VT200 = 1000,
1875};
1876
ac751efa 1877/* console_lock is held */
58d1af93 1878static void csi_DEC_hl(struct vc_data *vc, bool on_off)
1da177e4 1879{
58d1af93 1880 unsigned int i;
1da177e4
LT		 1881
1882 for (i = 0; i <= vc->vc_npar; i++)
58d1af93
JSS		 1883 switch (vc->vc_par[i]) {
1884 case CSI_DEC_hl_CURSOR_KEYS:
1885 if (on_off)
1886 set_kbd(vc, decckm);
1887 else
1888 clr_kbd(vc, decckm);
1889 break;
1890 case CSI_DEC_hl_132_COLUMNS: /* unimplemented */
1da177e4 1891#if 0
58d1af93
JSS		 1892 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1893 /* this alone does not suffice; some user mode
1894 utility has to change the hardware regs */
1da177e4 1895#endif
58d1af93
JSS		 1896 break;
1897 case CSI_DEC_hl_REVERSE_VIDEO:
1898 if (vc->vc_decscnm != on_off) {
1899 vc->vc_decscnm = on_off;
1900 invert_screen(vc, 0, vc->vc_screenbuf_size,
1901 false);
1902 update_attr(vc);
1da177e4 1903 }
58d1af93
JSS		 1904 break;
1905 case CSI_DEC_hl_ORIGIN_MODE:
1906 vc->vc_decom = on_off;
1907 gotoxay(vc, 0, 0);
1908 break;
1909 case CSI_DEC_hl_AUTOWRAP:
1910 vc->vc_decawm = on_off;
1911 break;
1912 case CSI_DEC_hl_AUTOREPEAT:
1913 if (on_off)
1914 set_kbd(vc, decarm);
1915 else
1916 clr_kbd(vc, decarm);
1917 break;
1918 case CSI_DEC_hl_MOUSE_X10:
1919 vc->vc_report_mouse = on_off ? 1 : 0;
1920 break;
1921 case CSI_DEC_hl_SHOW_CURSOR:
1922 vc->vc_deccm = on_off;
1923 break;
1924 case CSI_DEC_hl_MOUSE_VT200:
1925 vc->vc_report_mouse = on_off ? 2 : 0;
1926 break;
1da177e4
LT		 1927 }
1928}
1929
608053e1
JSS		 1930enum {
1931 CSI_hl_DISPLAY_CTRL = 3, /* handle ansi control chars */
1932 CSI_hl_INSERT = 4, /* IRM: insert/replace */
1933 CSI_hl_AUTO_NL = 20, /* LNM: Enter == CrLf/Lf */
1934};
1935
ac751efa 1936/* console_lock is held */
69b2c269 1937static void csi_hl(struct vc_data *vc, bool on_off)
1da177e4 1938{
58d1af93 1939 unsigned int i;
1da177e4
LT		 1940
1941 for (i = 0; i <= vc->vc_npar; i++)
58d1af93
JSS		 1942 switch (vc->vc_par[i]) { /* ANSI modes set/reset */
1943 case CSI_hl_DISPLAY_CTRL:
1944 vc->vc_disp_ctrl = on_off;
1945 break;
1946 case CSI_hl_INSERT:
1947 vc->vc_decim = on_off;
1948 break;
1949 case CSI_hl_AUTO_NL:
1950 if (on_off)
1951 set_kbd(vc, lnm);
1952 else
1953 clr_kbd(vc, lnm);
1954 break;
1da177e4
LT		 1955 }
1956}
1957
f9ac8d4e
JSS		 1958enum CSI_right_square_bracket {
1959 CSI_RSB_COLOR_FOR_UNDERLINE = 1,
1960 CSI_RSB_COLOR_FOR_HALF_BRIGHT = 2,
1961 CSI_RSB_MAKE_CUR_COLOR_DEFAULT = 8,
1962 CSI_RSB_BLANKING_INTERVAL = 9,
1963 CSI_RSB_BELL_FREQUENCY = 10,
1964 CSI_RSB_BELL_DURATION = 11,
1965 CSI_RSB_BRING_CONSOLE_TO_FRONT = 12,
1966 CSI_RSB_UNBLANK = 13,
1967 CSI_RSB_VESA_OFF_INTERVAL = 14,
1968 CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT = 15,
1969 CSI_RSB_CURSOR_BLINK_INTERVAL = 16,
1970};
1971
cc8539ca
JSS		 1972/*
1973 * csi_RSB - csi+] (Right Square Bracket) handler
1974 *
1975 * These are linux console private sequences.
1976 *
1977 * console_lock is held
1978 */
1979static void csi_RSB(struct vc_data *vc)
1da177e4 1980{
c3a834e8 1981 switch (vc->vc_par[0]) {
f9ac8d4e 1982 case CSI_RSB_COLOR_FOR_UNDERLINE:
c3a834e8
JS		 1983 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1984 vc->vc_ulcolor = color_table[vc->vc_par[1]];
28bc24fc 1985 if (vc->state.underline)
c3a834e8
JS		 1986 update_attr(vc);
1987 }
1988 break;
f9ac8d4e 1989 case CSI_RSB_COLOR_FOR_HALF_BRIGHT:
c3a834e8
JS		 1990 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1991 vc->vc_halfcolor = color_table[vc->vc_par[1]];
b84ae3dc 1992 if (vc->state.intensity == VCI_HALF_BRIGHT)
c3a834e8
JS		 1993 update_attr(vc);
1994 }
1995 break;
f9ac8d4e 1996 case CSI_RSB_MAKE_CUR_COLOR_DEFAULT:
c3a834e8
JS		 1997 vc->vc_def_color = vc->vc_attr;
1998 if (vc->vc_hi_font_mask == 0x100)
1999 vc->vc_def_color >>= 1;
2000 default_attr(vc);
2001 update_attr(vc);
2002 break;
f9ac8d4e 2003 case CSI_RSB_BLANKING_INTERVAL:
c3a834e8
JS		 2004 blankinterval = min(vc->vc_par[1], 60U) * 60;
2005 poke_blanked_console();
2006 break;
f9ac8d4e 2007 case CSI_RSB_BELL_FREQUENCY:
c3a834e8
JS		 2008 if (vc->vc_npar >= 1)
2009 vc->vc_bell_pitch = vc->vc_par[1];
2010 else
2011 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2012 break;
f9ac8d4e 2013 case CSI_RSB_BELL_DURATION:
c3a834e8
JS		 2014 if (vc->vc_npar >= 1)
2015 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
2016 msecs_to_jiffies(vc->vc_par[1]) : 0;
2017 else
2018 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2019 break;
f9ac8d4e 2020 case CSI_RSB_BRING_CONSOLE_TO_FRONT:
c3a834e8
JS		 2021 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
2022 set_console(vc->vc_par[1] - 1);
2023 break;
f9ac8d4e 2024 case CSI_RSB_UNBLANK:
c3a834e8
JS		 2025 poke_blanked_console();
2026 break;
f9ac8d4e 2027 case CSI_RSB_VESA_OFF_INTERVAL:
c3a834e8
JS		 2028 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2029 break;
f9ac8d4e 2030 case CSI_RSB_BRING_PREV_CONSOLE_TO_FRONT:
c3a834e8
JS		 2031 set_console(last_console);
2032 break;
f9ac8d4e 2033 case CSI_RSB_CURSOR_BLINK_INTERVAL:
c3a834e8
JS		 2034 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2035 vc->vc_par[1] <= USHRT_MAX)
2036 vc->vc_cur_blink_ms = vc->vc_par[1];
2037 else
2038 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2039 break;
1da177e4
LT		 2040 }
2041}
2042
ac751efa 2043/* console_lock is held */
1da177e4
LT		 2044static void csi_at(struct vc_data *vc, unsigned int nr)
2045{
eb881eba 2046 nr = clamp(nr, 1, vc->vc_cols - vc->state.x);
1da177e4
LT		 2047 insert_char(vc, nr);
2048}
2049
ac751efa 2050/* console_lock is held */
8e6bd49a 2051static void csi_L(struct vc_data *vc)
1da177e4 2052{
8e6bd49a
JSS		 2053 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2054
28bc24fc 2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 2056 vc->vc_need_wrap = 0;
2057}
2058
ac751efa 2059/* console_lock is held */
8e6bd49a 2060static void csi_P(struct vc_data *vc)
1da177e4 2061{
8e6bd49a
JSS		 2062 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_cols - vc->state.x);
2063
1da177e4
LT		 2064 delete_char(vc, nr);
2065}
2066
ac751efa 2067/* console_lock is held */
8e6bd49a 2068static void csi_M(struct vc_data *vc)
1da177e4 2069{
8e6bd49a
JSS		 2070 unsigned int nr = clamp(vc->vc_par[0], 1, vc->vc_rows - vc->state.y);
2071
28bc24fc 2072 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 2073 vc->vc_need_wrap = 0;
2074}
2075
ac751efa 2076/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 2077static void save_cur(struct vc_data *vc)
2078{
28bc24fc 2079 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
1da177e4
LT		 2080}
2081
ac751efa 2082/* console_lock is held */
1da177e4
LT		 2083static void restore_cur(struct vc_data *vc)
2084{
28bc24fc
JS		 2085 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2086
2087 gotoxy(vc, vc->state.x, vc->state.y);
b70ec4d9
JS		 2088 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2089 vc);
1da177e4
LT		 2090 update_attr(vc);
2091 vc->vc_need_wrap = 0;
2092}
2093
22795b3c
JSS		 2094/**
2095 * enum vc_ctl_state - control characters state of a vt
2096 *
2097 * @ESnormal: initial state, no control characters parsed
2098 * @ESesc: ESC parsed
2099 * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
2100 * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
2101 * @ESfunckey: CSI [ parsed
2102 * @EShash: ESC # parsed
2103 * @ESsetG0: ESC ( parsed
2104 * @ESsetG1: ESC ) parsed
2105 * @ESpercent: ESC % parsed
2106 * @EScsiignore: CSI [0x20-0x3f] parsed
2107 * @ESnonstd: OSC parsed
2108 * @ESpalette: OSC P parsed
2109 * @ESosc: OSC [0-9] parsed
fd5b4025 2110 * @ESANSI_first: first state for ignoring ansi control sequences
22795b3c
JSS		 2111 * @ESapc: ESC _ parsed
2112 * @ESpm: ESC ^ parsed
2113 * @ESdcs: ESC P parsed
fd5b4025 2114 * @ESANSI_last: last state for ignoring ansi control sequences
22795b3c
JSS		 2115 */
2116enum vc_ctl_state {
2117 ESnormal,
2118 ESesc,
2119 ESsquare,
2120 ESgetpars,
2121 ESfunckey,
2122 EShash,
2123 ESsetG0,
2124 ESsetG1,
2125 ESpercent,
2126 EScsiignore,
2127 ESnonstd,
2128 ESpalette,
2129 ESosc,
fd5b4025 2130 ESANSI_first = ESosc,
22795b3c
JSS		 2131 ESapc,
2132 ESpm,
2133 ESdcs,
fd5b4025 2134 ESANSI_last = ESdcs,
22795b3c 2135};
1da177e4 2136
ac751efa 2137/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2138static void reset_terminal(struct vc_data *vc, int do_clear)
2139{
dbee4cff
JS		 2140 unsigned int i;
2141
1da177e4
LT		 2142 vc->vc_top = 0;
2143 vc->vc_bottom = vc->vc_rows;
2144 vc->vc_state = ESnormal;
2ff5c5a1 2145 vc->vc_priv = EPecma;
1da177e4 2146 vc->vc_translate = set_translate(LAT1_MAP, vc);
b70ec4d9
JS		 2147 vc->state.Gx_charset[0] = LAT1_MAP;
2148 vc->state.Gx_charset[1] = GRAF_MAP;
28bc24fc 2149 vc->state.charset = 0;
1da177e4
LT		 2150 vc->vc_need_wrap = 0;
2151 vc->vc_report_mouse = 0;
042f10ec 2152 vc->vc_utf = default_utf8;
1da177e4
LT		 2153 vc->vc_utf_count = 0;
2154
2155 vc->vc_disp_ctrl = 0;
2156 vc->vc_toggle_meta = 0;
2157
2158 vc->vc_decscnm = 0;
2159 vc->vc_decom = 0;
2160 vc->vc_decawm = 1;
f6c06b68 2161 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2162 vc->vc_decim = 0;
2163
079c9534 2164 vt_reset_keyboard(vc->vc_num);
1da177e4 2165
9ea9a886 2166 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2167 vc->vc_complement_mask = vc->vc_s_complement_mask;
2168
2169 default_attr(vc);
2170 update_attr(vc);
2171
dbee4cff
JS		 2172 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2173 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2174 set_bit(i, vc->vc_tab_stop);
1da177e4
LT		 2175
2176 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2177 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2178 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2179
2180 gotoxy(vc, 0, 0);
2181 save_cur(vc);
2182 if (do_clear)
4b8f9361 2183 csi_J(vc, CSI_J_VISIBLE);
1da177e4
LT		 2184}
2185
a8ccce55 2186static void vc_setGx(struct vc_data *vc, unsigned int which, u8 c)
b4d92b65 2187{
b70ec4d9 2188 unsigned char *charset = &vc->state.Gx_charset[which];
b4d92b65
JS		 2189
2190 switch (c) {
2191 case '0':
2192 *charset = GRAF_MAP;
2193 break;
2194 case 'B':
2195 *charset = LAT1_MAP;
2196 break;
2197 case 'U':
2198 *charset = IBMPC_MAP;
2199 break;
2200 case 'K':
2201 *charset = USER_MAP;
2202 break;
2203 }
2204
2205 if (vc->state.charset == which)
2206 vc->vc_translate = set_translate(*charset, vc);
2207}
2208
fd5b4025 2209static bool ansi_control_string(enum vc_ctl_state state)
3a2b2eb5 2210{
fd5b4025 2211 return state >= ESANSI_first && state <= ESANSI_last;
3a2b2eb5 2212}
2213
bf9e206b
JSS		 2214enum {
2215 ASCII_NULL = 0,
2216 ASCII_BELL = 7,
2217 ASCII_BACKSPACE = 8,
2218 ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
2219 ASCII_HTAB = 9,
2220 ASCII_LINEFEED = 10,
2221 ASCII_VTAB = 11,
2222 ASCII_FORMFEED = 12,
2223 ASCII_CAR_RET = 13,
2224 ASCII_IGNORE_LAST = ASCII_CAR_RET,
2225 ASCII_SHIFTOUT = 14,
2226 ASCII_SHIFTIN = 15,
2227 ASCII_CANCEL = 24,
2228 ASCII_SUBSTITUTE = 26,
2229 ASCII_ESCAPE = 27,
2230 ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
2231 ASCII_CSI_IGNORE_LAST = '?',
2232 ASCII_DEL = 127,
2233 ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
2234};
2235
ce66f8e3
JSS		 2236/*
2237 * Handle ascii characters in control sequences and change states accordingly.
2238 * E.g. ESC sets the state of vc to ESesc.
2239 *
2240 * Returns: true if @c handled.
2241 */
2242static bool handle_ascii(struct tty_struct *tty, struct vc_data *vc, u8 c)
1da177e4 2243{
1da177e4 2244 switch (c) {
bf9e206b 2245 case ASCII_NULL:
ce66f8e3 2246 return true;
bf9e206b 2247 case ASCII_BELL:
3a2b2eb5 2248 if (ansi_control_string(vc->vc_state))
63f3a16d
AB		 2249 vc->vc_state = ESnormal;
2250 else if (vc->vc_bell_duration)
1da177e4 2251 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
ce66f8e3 2252 return true;
bf9e206b 2253 case ASCII_BACKSPACE:
1da177e4 2254 bs(vc);
ce66f8e3 2255 return true;
bf9e206b 2256 case ASCII_HTAB:
28bc24fc 2257 vc->vc_pos -= (vc->state.x << 1);
dbee4cff
JS		 2258
2259 vc->state.x = find_next_bit(vc->vc_tab_stop,
2260 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2261 vc->state.x + 1);
2262 if (vc->state.x >= VC_TABSTOPS_COUNT)
2263 vc->state.x = vc->vc_cols - 1;
2264
28bc24fc 2265 vc->vc_pos += (vc->state.x << 1);
b293d758 2266 notify_write(vc, '\t');
ce66f8e3 2267 return true;
bf9e206b
JSS		 2268 case ASCII_LINEFEED:
2269 case ASCII_VTAB:
2270 case ASCII_FORMFEED:
1da177e4
LT		 2271 lf(vc);
2272 if (!is_kbd(vc, lnm))
ce66f8e3 2273 return true;
df561f66 2274 fallthrough;
bf9e206b 2275 case ASCII_CAR_RET:
1da177e4 2276 cr(vc);
ce66f8e3 2277 return true;
bf9e206b 2278 case ASCII_SHIFTOUT:
28bc24fc 2279 vc->state.charset = 1;
b70ec4d9 2280 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
1da177e4 2281 vc->vc_disp_ctrl = 1;
ce66f8e3 2282 return true;
bf9e206b 2283 case ASCII_SHIFTIN:
28bc24fc 2284 vc->state.charset = 0;
b70ec4d9 2285 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
1da177e4 2286 vc->vc_disp_ctrl = 0;
ce66f8e3 2287 return true;
bf9e206b
JSS		 2288 case ASCII_CANCEL:
2289 case ASCII_SUBSTITUTE:
1da177e4 2290 vc->vc_state = ESnormal;
ce66f8e3 2291 return true;
bf9e206b 2292 case ASCII_ESCAPE:
1da177e4 2293 vc->vc_state = ESesc;
ce66f8e3 2294 return true;
bf9e206b 2295 case ASCII_DEL:
1da177e4 2296 del(vc);
ce66f8e3 2297 return true;
bf9e206b 2298 case ASCII_EXT_CSI:
1da177e4 2299 vc->vc_state = ESsquare;
ce66f8e3 2300 return true;
1da177e4 2301 }
ce66f8e3
JSS		 2302
2303 return false;
2304}
2305
a9ffb223
JSS		 2306/*
2307 * Handle a character (@c) following an ESC (when @vc is in the ESesc state).
2308 * E.g. previous ESC with @c == '[' here yields the ESsquare state (that is:
2309 * CSI).
2310 */
2311static void handle_esc(struct tty_struct *tty, struct vc_data *vc, u8 c)
2312{
2313 vc->vc_state = ESnormal;
2314 switch (c) {
2315 case '[':
2316 vc->vc_state = ESsquare;
2317 break;
2318 case ']':
2319 vc->vc_state = ESnonstd;
2320 break;
2321 case '_':
2322 vc->vc_state = ESapc;
2323 break;
2324 case '^':
2325 vc->vc_state = ESpm;
2326 break;
2327 case '%':
2328 vc->vc_state = ESpercent;
2329 break;
2330 case 'E':
2331 cr(vc);
2332 lf(vc);
2333 break;
2334 case 'M':
2335 ri(vc);
2336 break;
2337 case 'D':
2338 lf(vc);
2339 break;
2340 case 'H':
2341 if (vc->state.x < VC_TABSTOPS_COUNT)
2342 set_bit(vc->state.x, vc->vc_tab_stop);
2343 break;
2344 case 'P':
2345 vc->vc_state = ESdcs;
2346 break;
2347 case 'Z':
2348 respond_ID(tty);
2349 break;
2350 case '7':
2351 save_cur(vc);
2352 break;
2353 case '8':
2354 restore_cur(vc);
2355 break;
2356 case '(':
2357 vc->vc_state = ESsetG0;
2358 break;
2359 case ')':
2360 vc->vc_state = ESsetG1;
2361 break;
2362 case '#':
2363 vc->vc_state = EShash;
2364 break;
2365 case 'c':
2366 reset_terminal(vc, 1);
2367 break;
2368 case '>': /* Numeric keypad */
2369 clr_kbd(vc, kbdapplic);
2370 break;
2371 case '=': /* Appl. keypad */
2372 set_kbd(vc, kbdapplic);
2373 break;
2374 }
2375}
2376
de0f61f3
JSS		 2377/*
2378 * Handle special DEC control sequences ("ESC [ ? parameters char"). Parameters
2379 * are in @vc->vc_par and the char is in @c here.
2380 */
2381static void csi_DEC(struct tty_struct *tty, struct vc_data *vc, u8 c)
2382{
2383 switch (c) {
2384 case 'h':
2385 csi_DEC_hl(vc, true);
2386 break;
2387 case 'l':
2388 csi_DEC_hl(vc, false);
2389 break;
2390 case 'c':
2391 if (vc->vc_par[0])
2392 vc->vc_cursor_type = CUR_MAKE(vc->vc_par[0],
2393 vc->vc_par[1],
2394 vc->vc_par[2]);
2395 else
2396 vc->vc_cursor_type = cur_default;
2397 break;
2398 case 'm':
2399 clear_selection();
2400 if (vc->vc_par[0])
2401 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2402 else
2403 vc->vc_complement_mask = vc->vc_s_complement_mask;
2404 break;
2405 case 'n':
2406 if (vc->vc_par[0] == 5)
2407 status_report(tty);
2408 else if (vc->vc_par[0] == 6)
2409 cursor_report(vc, tty);
2410 break;
2411 }
2412}
2413
7c1c9c14
JSS		 2414/*
2415 * Handle Control Sequence Introducer control characters. That is
2416 * "ESC [ parameters char". Parameters are in @vc->vc_par and the char is in
2417 * @c here.
2418 */
2419static void csi_ECMA(struct tty_struct *tty, struct vc_data *vc, u8 c)
2420{
2421 switch (c) {
2422 case 'G':
2423 case '`':
2424 if (vc->vc_par[0])
2425 vc->vc_par[0]--;
2426 gotoxy(vc, vc->vc_par[0], vc->state.y);
2427 break;
2428 case 'A':
2429 if (!vc->vc_par[0])
2430 vc->vc_par[0]++;
2431 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2432 break;
2433 case 'B':
2434 case 'e':
2435 if (!vc->vc_par[0])
2436 vc->vc_par[0]++;
2437 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2438 break;
2439 case 'C':
2440 case 'a':
2441 if (!vc->vc_par[0])
2442 vc->vc_par[0]++;
2443 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2444 break;
2445 case 'D':
2446 if (!vc->vc_par[0])
2447 vc->vc_par[0]++;
2448 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2449 break;
2450 case 'E':
2451 if (!vc->vc_par[0])
2452 vc->vc_par[0]++;
2453 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2454 break;
2455 case 'F':
2456 if (!vc->vc_par[0])
2457 vc->vc_par[0]++;
2458 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2459 break;
2460 case 'd':
2461 if (vc->vc_par[0])
2462 vc->vc_par[0]--;
2463 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2464 break;
2465 case 'H':
2466 case 'f':
2467 if (vc->vc_par[0])
2468 vc->vc_par[0]--;
2469 if (vc->vc_par[1])
2470 vc->vc_par[1]--;
2471 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2472 break;
2473 case 'J':
2474 csi_J(vc, vc->vc_par[0]);
2475 break;
2476 case 'K':
2477 csi_K(vc);
2478 break;
2479 case 'L':
2480 csi_L(vc);
2481 break;
2482 case 'M':
2483 csi_M(vc);
2484 break;
2485 case 'P':
2486 csi_P(vc);
2487 break;
2488 case 'c':
2489 if (!vc->vc_par[0])
1da177e4 2490 respond_ID(tty);
7c1c9c14
JSS		 2491 break;
2492 case 'g':
2493 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2494 set_bit(vc->state.x, vc->vc_tab_stop);
2495 else if (vc->vc_par[0] == 3)
2496 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2497 break;
2498 case 'h':
2499 csi_hl(vc, true);
2500 break;
2501 case 'l':
2502 csi_hl(vc, false);
2503 break;
2504 case 'm':
2505 csi_m(vc);
2506 break;
2507 case 'n':
2508 if (vc->vc_par[0] == 5)
2509 status_report(tty);
2510 else if (vc->vc_par[0] == 6)
2511 cursor_report(vc, tty);
2512 break;
2513 case 'q': /* DECLL - but only 3 leds */
2514 /* map 0,1,2,3 to 0,1,2,4 */
2515 if (vc->vc_par[0] < 4)
2516 vt_set_led_state(vc->vc_num,
2517 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2518 break;
2519 case 'r':
2520 if (!vc->vc_par[0])
2521 vc->vc_par[0]++;
2522 if (!vc->vc_par[1])
2523 vc->vc_par[1] = vc->vc_rows;
2524 /* Minimum allowed region is 2 lines */
2525 if (vc->vc_par[0] < vc->vc_par[1] &&
2526 vc->vc_par[1] <= vc->vc_rows) {
2527 vc->vc_top = vc->vc_par[0] - 1;
2528 vc->vc_bottom = vc->vc_par[1];
2529 gotoxay(vc, 0, 0);
1da177e4 2530 }
7c1c9c14
JSS		 2531 break;
2532 case 's':
2533 save_cur(vc);
2534 break;
2535 case 'u':
2536 restore_cur(vc);
2537 break;
2538 case 'X':
2539 csi_X(vc);
2540 break;
2541 case '@':
2542 csi_at(vc, vc->vc_par[0]);
2543 break;
2544 case ']':
2545 csi_RSB(vc);
2546 break;
2547 }
2548
2549}
2550
798d8b1c
JSS		 2551static void vc_reset_params(struct vc_data *vc)
2552{
2553 memset(vc->vc_par, 0, sizeof(vc->vc_par));
2554 vc->vc_npar = 0;
2555}
2556
ce66f8e3
JSS		 2557/* console_lock is held */
2558static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
2559{
2560 /*
2561 * Control characters can be used in the _middle_
2562 * of an escape sequence, aside from ANSI control strings.
2563 */
2564 if (ansi_control_string(vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
2565 c <= ASCII_IGNORE_LAST)
2566 return;
2567
2568 if (handle_ascii(tty, vc, c))
2569 return;
2570
1da177e4 2571 switch(vc->vc_state) {
22795b3c 2572 case ESesc: /* ESC */
a9ffb223 2573 handle_esc(tty, vc, c);
1da177e4 2574 return;
22795b3c 2575 case ESnonstd: /* ESC ] aka OSC */
3d5f5b97
JSS		 2576 switch (c) {
2577 case 'P': /* palette escape sequence */
798d8b1c 2578 vc_reset_params(vc);
1da177e4
LT		 2579 vc->vc_state = ESpalette;
2580 return;
3d5f5b97 2581 case 'R': /* reset palette */
1da177e4 2582 reset_palette(vc);
3d5f5b97
JSS		 2583 break;
2584 case '0' ... '9':
63f3a16d 2585 vc->vc_state = ESosc;
3d5f5b97
JSS		 2586 return;
2587 }
2588 vc->vc_state = ESnormal;
1da177e4 2589 return;
22795b3c 2590 case ESpalette: /* ESC ] P aka OSC P */
74c807ce
AS		 2591 if (isxdigit(c)) {
2592 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2593 if (vc->vc_npar == 7) {
2594 int i = vc->vc_par[0] * 3, j = 1;
2595 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2596 vc->vc_palette[i++] += vc->vc_par[j++];
2597 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2598 vc->vc_palette[i++] += vc->vc_par[j++];
2599 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2600 vc->vc_palette[i] += vc->vc_par[j];
2601 set_palette(vc);
2602 vc->vc_state = ESnormal;
2603 }
2604 } else
2605 vc->vc_state = ESnormal;
2606 return;
22795b3c 2607 case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
798d8b1c
JSS		 2608 vc_reset_params(vc);
2609
1da177e4 2610 vc->vc_state = ESgetpars;
5445447b 2611 switch (c) {
bc9d077a
JSS		 2612 case '[': /* Function key */
2613 vc->vc_state = ESfunckey;
2614 return;
5445447b
MH		 2615 case '?':
2616 vc->vc_priv = EPdec;
2617 return;
2618 case '>':
2619 vc->vc_priv = EPgt;
2620 return;
2621 case '=':
2622 vc->vc_priv = EPeq;
1da177e4 2623 return;
5445447b
MH		 2624 case '<':
2625 vc->vc_priv = EPlt;
2626 return;
2627 }
2628 vc->vc_priv = EPecma;
df561f66 2629 fallthrough;
22795b3c 2630 case ESgetpars: /* ESC [ aka CSI, parameters expected */
137eb9ad
JSS		 2631 switch (c) {
2632 case ';':
2633 if (vc->vc_npar < NPAR - 1) {
2634 vc->vc_npar++;
2635 return;
2636 }
2637 break;
2638 case '0' ... '9':
1da177e4
LT		 2639 vc->vc_par[vc->vc_npar] *= 10;
2640 vc->vc_par[vc->vc_npar] += c - '0';
2641 return;
b290af68 2642 }
bf9e206b 2643 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
7a99565f
MH		 2644 vc->vc_state = EScsiignore;
2645 return;
2646 }
22795b3c
JSS		 2647
2648 /* parameters done, handle the control char @c */
2649
1da177e4 2650 vc->vc_state = ESnormal;
de0f61f3
JSS		 2651
2652 switch (vc->vc_priv) {
2653 case EPdec:
2654 csi_DEC(tty, vc, c);
1da177e4 2655 return;
de0f61f3 2656 case EPecma:
7c1c9c14 2657 csi_ECMA(tty, vc, c);
1da177e4 2658 return;
7c1c9c14 2659 default:
1da177e4
LT		 2660 return;
2661 }
7a99565f 2662 case EScsiignore:
bf9e206b 2663 if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
7a99565f
MH		 2664 return;
2665 vc->vc_state = ESnormal;
2666 return;
22795b3c 2667 case ESpercent: /* ESC % */
1da177e4
LT		 2668 vc->vc_state = ESnormal;
2669 switch (c) {
2670 case '@': /* defined in ISO 2022 */
2671 vc->vc_utf = 0;
2672 return;
2673 case 'G': /* prelim official escape code */
2674 case '8': /* retained for compatibility */
2675 vc->vc_utf = 1;
2676 return;
2677 }
2678 return;
22795b3c 2679 case ESfunckey: /* ESC [ [ aka CSI [ */
1da177e4
LT		 2680 vc->vc_state = ESnormal;
2681 return;
22795b3c 2682 case EShash: /* ESC # */
1da177e4
LT		 2683 vc->vc_state = ESnormal;
2684 if (c == '8') {
2685 /* DEC screen alignment test. kludge :-) */
2686 vc->vc_video_erase_char =
2687 (vc->vc_video_erase_char & 0xff00) | 'E';
4b8f9361 2688 csi_J(vc, CSI_J_VISIBLE);
1da177e4
LT		 2689 vc->vc_video_erase_char =
2690 (vc->vc_video_erase_char & 0xff00) | ' ';
2691 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2692 }
2693 return;
22795b3c 2694 case ESsetG0: /* ESC ( */
b4d92b65 2695 vc_setGx(vc, 0, c);
1da177e4
LT		 2696 vc->vc_state = ESnormal;
2697 return;
22795b3c 2698 case ESsetG1: /* ESC ) */
b4d92b65 2699 vc_setGx(vc, 1, c);
1da177e4
LT		 2700 vc->vc_state = ESnormal;
2701 return;
22795b3c 2702 case ESapc: /* ESC _ */
3a2b2eb5 2703 return;
22795b3c 2704 case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
63f3a16d 2705 return;
22795b3c 2706 case ESpm: /* ESC ^ */
3a2b2eb5 2707 return;
22795b3c 2708 case ESdcs: /* ESC P */
3a2b2eb5 2709 return;
1da177e4
LT		 2710 default:
2711 vc->vc_state = ESnormal;
2712 }
2713}
2714
2f1a2ccb 2715/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2716 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
a6fdf0c7 2717 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2f1a2ccb
EK		 2718 */
2719struct interval {
2720 uint32_t first;
2721 uint32_t last;
2722};
2723
f0a8d84f 2724static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2725{
f0a8d84f
TM		 2726 uint32_t ucs = *(uint32_t *)key;
2727 struct interval e = *(struct interval *) elt;
2f1a2ccb 2728
f0a8d84f
TM		 2729 if (ucs > e.last)
2730 return 1;
2731 else if (ucs < e.first)
2732 return -1;
2f1a2ccb
EK		 2733 return 0;
2734}
2735
2736static int is_double_width(uint32_t ucs)
2737{
2738 static const struct interval double_width[] = {
2739 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2740 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2741 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2742 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2743 };
f0a8d84f
TM		 2744 if (ucs < double_width[0].first ||
2745 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2746 return 0;
2747
2748 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2749 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2750}
2751
917ae1a9
JS		 2752struct vc_draw_region {
2753 unsigned long from, to;
2754 int x;
2755};
2756
2757static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
d711ea8f 2758{
917ae1a9 2759 if (draw->x < 0)
d711ea8f
JS		 2760 return;
2761
917ae1a9
JS		 2762 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2763 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2764 draw->x);
2765 draw->x = -1;
d711ea8f
JS		 2766}
2767
a018180c
JS		 2768static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2769{
2770 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2771 if (vc->vc_toggle_meta)
2772 c |= 0x80;
2773
2774 return vc->vc_translate[c];
2775 }
2776
2777 return c;
2778}
2779
ede98d12
JS		 2780
2781/**
60234365 2782 * vc_sanitize_unicode - Replace invalid Unicode code points with ``U+FFFD``
8524788a 2783 * @c: the received code point
ede98d12
JS		 2784 */
2785static inline int vc_sanitize_unicode(const int c)
2786{
c01e71b4 2787 if (c >= 0xd800 && c <= 0xdfff)
ede98d12
JS		 2788 return 0xfffd;
2789
2790 return c;
2791}
2792
694d8a48 2793/**
60234365 2794 * vc_translate_unicode - Combine UTF-8 into Unicode in &vc_data.vc_utf_char
ea239f1e 2795 * @vc: virtual console
8524788a
RŽ		 2796 * @c: UTF-8 byte to translate
2797 * @rescan: set to true iff @c wasn't consumed here and needs to be re-processed
694d8a48 2798 *
8524788a 2799 * * &vc_data.vc_utf_char is the being-constructed Unicode code point.
60234365
JSS		 2800 * * &vc_data.vc_utf_count is the number of continuation bytes still expected to
2801 * arrive.
2802 * * &vc_data.vc_npar is the number of continuation bytes arrived so far.
694d8a48 2803 *
8524788a
RŽ		 2804 * Return:
2805 * * %-1 - Input OK so far, @c consumed, further bytes expected.
2806 * * %0xFFFD - Possibility 1: input invalid, @c may have been consumed (see
2807 * desc. of @rescan). Possibility 2: input OK, @c consumed,
2808 * ``U+FFFD`` is the resulting code point. ``U+FFFD`` is valid,
2809 * ``REPLACEMENT CHARACTER``.
2810 * * otherwise - Input OK, @c consumed, resulting code point returned.
694d8a48
JS		 2811 */
2812static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2813{
c01e71b4 2814 static const u32 utf8_length_changes[] = {0x7f, 0x7ff, 0xffff, 0x10ffff};
694d8a48 2815
ede98d12 2816 /* Continuation byte received */
694d8a48 2817 if ((c & 0xc0) == 0x80) {
ede98d12
JS		 2818 /* Unexpected continuation byte? */
2819 if (!vc->vc_utf_count)
694d8a48 2820 return 0xfffd;
ede98d12
JS		 2821
2822 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2823 vc->vc_npar++;
2824 if (--vc->vc_utf_count)
2825 goto need_more_bytes;
2826
2827 /* Got a whole character */
2828 c = vc->vc_utf_char;
2829 /* Reject overlong sequences */
2830 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2831 c > utf8_length_changes[vc->vc_npar])
694d8a48 2832 return 0xfffd;
ede98d12
JS		 2833
2834 return vc_sanitize_unicode(c);
694d8a48 2835 }
ede98d12
JS		 2836
2837 /* Single ASCII byte or first byte of a sequence received */
2838 if (vc->vc_utf_count) {
2839 /* Continuation byte expected */
2840 *rescan = true;
2841 vc->vc_utf_count = 0;
694d8a48 2842 return 0xfffd;
ede98d12 2843 }
694d8a48 2844
ede98d12
JS		 2845 /* Nothing to do if an ASCII byte was received */
2846 if (c <= 0x7f)
2847 return c;
2848
2849 /* First byte of a multibyte sequence received */
2850 vc->vc_npar = 0;
2851 if ((c & 0xe0) == 0xc0) {
2852 vc->vc_utf_count = 1;
2853 vc->vc_utf_char = (c & 0x1f);
2854 } else if ((c & 0xf0) == 0xe0) {
2855 vc->vc_utf_count = 2;
2856 vc->vc_utf_char = (c & 0x0f);
2857 } else if ((c & 0xf8) == 0xf0) {
2858 vc->vc_utf_count = 3;
2859 vc->vc_utf_char = (c & 0x07);
ede98d12 2860 } else {
ede98d12
JS		 2861 return 0xfffd;
2862 }
2863
2864need_more_bytes:
2865 return -1;
694d8a48
JS		 2866}
2867
a4236348
JS		 2868static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2869{
2870 /* Do no translation at all in control states */
2871 if (vc->vc_state != ESnormal)
2872 return *c;
2873
2874 if (vc->vc_utf && !vc->vc_disp_ctrl)
2875 return *c = vc_translate_unicode(vc, *c, rescan);
2876
2877 /* no utf or alternate charset mode */
2878 return vc_translate_ascii(vc, *c);
2879}
2880
881c8783
JS		 2881static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2882{
2883 if (!vc->vc_can_do_color)
2884 return vc->vc_attr ^ 0x08;
2885
2886 if (vc->vc_hi_font_mask == 0x100)
2887 return (vc->vc_attr & 0x11) |
2888 ((vc->vc_attr & 0xe0) >> 4) |
2889 ((vc->vc_attr & 0x0e) << 4);
2890
2891 return (vc->vc_attr & 0x88) |
2892 ((vc->vc_attr & 0x70) >> 4) |
2893 ((vc->vc_attr & 0x07) << 4);
2894}
2895
754bda98
JS		 2896static bool vc_is_control(struct vc_data *vc, int tc, int c)
2897{
2898 /*
2899 * A bitmap for codes <32. A bit of 1 indicates that the code
2900 * corresponding to that bit number invokes some special action (such
2901 * as cursor movement) and should not be displayed as a glyph unless
2902 * the disp_ctrl mode is explicitly enabled.
2903 */
6cc3028f
JSS		 2904 static const u32 CTRL_ACTION = BIT(ASCII_NULL) |
2905 GENMASK(ASCII_SHIFTIN, ASCII_BELL) | BIT(ASCII_CANCEL) |
2906 BIT(ASCII_SUBSTITUTE) | BIT(ASCII_ESCAPE);
754bda98 2907 /* Cannot be overridden by disp_ctrl */
6cc3028f
JSS		 2908 static const u32 CTRL_ALWAYS = BIT(ASCII_NULL) | BIT(ASCII_BACKSPACE) |
2909 BIT(ASCII_LINEFEED) | BIT(ASCII_SHIFTIN) | BIT(ASCII_SHIFTOUT) |
2910 BIT(ASCII_CAR_RET) | BIT(ASCII_FORMFEED) | BIT(ASCII_ESCAPE);
754bda98
JS		 2911
2912 if (vc->vc_state != ESnormal)
2913 return true;
2914
2915 if (!tc)
2916 return true;
2917
2918 /*
2919 * If the original code was a control character we only allow a glyph
2920 * to be displayed if the code is not normally used (such as for cursor
2921 * movement) or if the disp_ctrl mode has been explicitly enabled.
2922 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2923 * displayed as control characters, as the console would be pretty
2924 * useless without them; to display an arbitrary font position use the
2925 * direct-to-font zone in UTF-8 mode.
2926 */
6cc3028f 2927 if (c < BITS_PER_TYPE(CTRL_ALWAYS)) {
754bda98
JS		 2928 if (vc->vc_disp_ctrl)
2929 return CTRL_ALWAYS & BIT(c);
2930 else
2931 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2932 }
2933
bf9e206b 2934 if (c == ASCII_DEL && !vc->vc_disp_ctrl)
754bda98
JS		 2935 return true;
2936
bf9e206b 2937 if (c == ASCII_EXT_CSI)
754bda98
JS		 2938 return true;
2939
2940 return false;
2941}
2942
391536ab
JS		 2943static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2944 struct vc_draw_region *draw)
2945{
2946 int next_c;
f3205b29 2947 unsigned char vc_attr = vc->vc_attr;
391536ab
JS		 2948 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2949 u8 width = 1;
2950 bool inverse = false;
2951
2952 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2953 if (is_double_width(c))
2954 width = 2;
2955 }
2956
2957 /* Now try to find out how to display it */
2958 tc = conv_uni_to_pc(vc, tc);
2959 if (tc & ~charmask) {
2960 if (tc == -1 || tc == -2)
2961 return -1; /* nothing to display */
2962
2963 /* Glyph not found */
6923e2d7 2964 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
391536ab
JS		 2965 !(c & ~charmask)) {
2966 /*
2967 * In legacy mode use the glyph we get by a 1:1
2968 * mapping.
2969 * This would make absolutely no sense with Unicode in
2970 * mind, but do this for ASCII characters since a font
2971 * may lack Unicode mapping info and we don't want to
2972 * end up with having question marks only.
2973 */
2974 tc = c;
2975 } else {
2976 /*
2977 * Display U+FFFD. If it's not found, display an inverse
2978 * question mark.
2979 */
2980 tc = conv_uni_to_pc(vc, 0xfffd);
2981 if (tc < 0) {
2982 inverse = true;
2983 tc = conv_uni_to_pc(vc, '?');
2984 if (tc < 0)
2985 tc = '?';
f3205b29
JS		 2986
2987 vc_attr = vc_invert_attr(vc);
2988 con_flush(vc, draw);
391536ab
JS		 2989 }
2990 }
2991 }
2992
391536ab
JS		 2993 next_c = c;
2994 while (1) {
2995 if (vc->vc_need_wrap || vc->vc_decim)
2996 con_flush(vc, draw);
2997 if (vc->vc_need_wrap) {
2998 cr(vc);
2999 lf(vc);
3000 }
3001 if (vc->vc_decim)
3002 insert_char(vc, 1);
3003 vc_uniscr_putc(vc, next_c);
f1bcbe14
JS		 3004
3005 if (himask)
3006 tc = ((tc & 0x100) ? himask : 0) |
3007 (tc & 0xff);
3008 tc |= (vc_attr << 8) & ~himask;
3009
3010 scr_writew(tc, (u16 *)vc->vc_pos);
3011
391536ab
JS		 3012 if (con_should_update(vc) && draw->x < 0) {
3013 draw->x = vc->state.x;
3014 draw->from = vc->vc_pos;
3015 }
3016 if (vc->state.x == vc->vc_cols - 1) {
3017 vc->vc_need_wrap = vc->vc_decawm;
3018 draw->to = vc->vc_pos + 2;
3019 } else {
3020 vc->state.x++;
3021 draw->to = (vc->vc_pos += 2);
3022 }
3023
3024 if (!--width)
3025 break;
3026
3027 /* A space is printed in the second column */
3028 tc = conv_uni_to_pc(vc, ' ');
3029 if (tc < 0)
3030 tc = ' ';
3031 next_c = ' ';
3032 }
3033 notify_write(vc, c);
3034
3035 if (inverse)
3036 con_flush(vc, draw);
3037
3038 return 0;
3039}
3040
ac751efa 3041/* acquires console_lock */
69851e4a 3042static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
1da177e4 3043{
917ae1a9
JS		 3044 struct vc_draw_region draw = {
3045 .x = -1,
3046 };
391536ab 3047 int c, tc, n = 0;
1da177e4 3048 unsigned int currcons;
b3dd9bef 3049 struct vc_data *vc = tty->driver_data;
0341a4d0 3050 struct vt_notifier_param param;
da823b2d 3051 bool rescan;
1da177e4
LT		 3052
3053 if (in_interrupt())
3054 return count;
3055
ac751efa 3056 console_lock();
1da177e4
LT		 3057 currcons = vc->vc_num;
3058 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 3059 /* could this happen? */
3060 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
3061 console_unlock();
3062 return 0;
1da177e4 3063 }
1da177e4 3064
1da177e4
LT		 3065
3066 /* undraw cursor first */
6ca8dfd7 3067 if (con_is_fg(vc))
1da177e4
LT		 3068 hide_cursor(vc);
3069
0341a4d0
KD		 3070 param.vc = vc;
3071
6e94dbc7 3072 while (!tty->flow.stopped && count) {
a8ccce55 3073 u8 orig = *buf;
1da177e4
LT		 3074 buf++;
3075 n++;
3076 count--;
0d1ffef5
JS		 3077rescan_last_byte:
3078 c = orig;
da823b2d 3079 rescan = false;
1da177e4 3080
a4236348
JS		 3081 tc = vc_translate(vc, &c, &rescan);
3082 if (tc == -1)
3083 continue;
1da177e4 3084
0341a4d0
KD		 3085 param.c = tc;
3086 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
3087 &param) == NOTIFY_STOP)
3088 continue;
3089
391536ab
JS		 3090 if (vc_is_control(vc, tc, c)) {
3091 con_flush(vc, &draw);
3092 do_con_trol(tty, vc, orig);
1da177e4
LT		 3093 continue;
3094 }
391536ab
JS		 3095
3096 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
3097 continue;
3098
3099 if (rescan)
3100 goto rescan_last_byte;
1da177e4 3101 }
917ae1a9 3102 con_flush(vc, &draw);
1da177e4 3103 console_conditional_schedule();
b293d758 3104 notify_update(vc);
7e1d2263 3105 console_unlock();
1da177e4 3106 return n;
1da177e4
LT		 3107}
3108
3109/*
3110 * This is the console switching callback.
3111 *
3112 * Doing console switching in a process context allows
3113 * us to do the switches asynchronously (needed when we want
3114 * to switch due to a keyboard interrupt). Synchronization
3115 * with other console code and prevention of re-entrancy is
ac751efa 3116 * ensured with console_lock.
1da177e4 3117 */
65f27f38 3118static void console_callback(struct work_struct *ignored)
1da177e4 3119{
ac751efa 3120 console_lock();
1da177e4
LT		 3121
3122 if (want_console >= 0) {
3123 if (want_console != fg_console &&
3124 vc_cons_allocated(want_console)) {
3125 hide_cursor(vc_cons[fg_console].d);
3126 change_console(vc_cons[want_console].d);
3127 /* we only changed when the console had already
3128 been allocated - a new console is not created
3129 in an interrupt routine */
3130 }
3131 want_console = -1;
3132 }
3133 if (do_poke_blanked_console) { /* do not unblank for a LED change */
3134 do_poke_blanked_console = 0;
3135 poke_blanked_console();
3136 }
3137 if (scrollback_delta) {
3138 struct vc_data *vc = vc_cons[fg_console].d;
3139 clear_selection();
97293de9 3140 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 3141 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3142 scrollback_delta = 0;
3143 }
3144 if (blank_timer_expired) {
3145 do_blank_screen(0);
3146 blank_timer_expired = 0;
3147 }
b293d758 3148 notify_update(vc_cons[fg_console].d);
1da177e4 3149
ac751efa 3150 console_unlock();
1da177e4
LT		 3151}
3152
b257bc05 3153int set_console(int nr)
1da177e4 3154{
b257bc05
AJ		 3155 struct vc_data *vc = vc_cons[fg_console].d;
3156
3157 if (!vc_cons_allocated(nr) || vt_dont_switch ||
3158 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3159
3160 /*
3161 * Console switch will fail in console_callback() or
3162 * change_console() so there is no point scheduling
3163 * the callback
3164 *
3165 * Existing set_console() users don't check the return
3166 * value so this shouldn't break anything
3167 */
3168 return -EINVAL;
3169 }
3170
1da177e4
LT		 3171 want_console = nr;
3172 schedule_console_callback();
b257bc05
AJ		 3173
3174 return 0;
1da177e4
LT		 3175}
3176
3177struct tty_driver *console_driver;
3178
3179#ifdef CONFIG_VT_CONSOLE
3180
5ada918b 3181/**
60234365
JSS		 3182 * vt_kmsg_redirect() - sets/gets the kernel message console
3183 * @new: the new virtual terminal number or -1 if the console should stay
3184 * unchanged
5ada918b
BW		 3185 *
3186 * By default, the kernel messages are always printed on the current virtual
3187 * console. However, the user may modify that default with the
60234365 3188 * %TIOCL_SETKMSGREDIRECT ioctl call.
5ada918b
BW		 3189 *
3190 * This function sets the kernel message console to be @new. It returns the old
60234365 3191 * virtual console number. The virtual terminal number %0 (both as parameter and
5ada918b
BW		 3192 * return value) means no redirection (i.e. always printed on the currently
3193 * active console).
3194 *
3195 * The parameter -1 means that only the current console is returned, but the
3196 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3197 * case to make the code more understandable.
3198 *
60234365
JSS		 3199 * When the kernel is compiled without %CONFIG_VT_CONSOLE, this function ignores
3200 * the parameter and always returns %0.
5ada918b
BW		 3201 */
3202int vt_kmsg_redirect(int new)
3203{
3204 static int kmsg_con;
3205
3206 if (new != -1)
3207 return xchg(&kmsg_con, new);
3208 else
3209 return kmsg_con;
3210}
3211
1da177e4
LT		 3212/*
3213 * Console on virtual terminal
3214 *
3215 * The console must be locked when we get here.
3216 */
3217
3218static void vt_console_print(struct console *co, const char *b, unsigned count)
3219{
3220 struct vc_data *vc = vc_cons[fg_console].d;
3221 unsigned char c;
b0940003 3222 static DEFINE_SPINLOCK(printing_lock);
1da177e4 3223 const ushort *start;
6609cff6 3224 ushort start_x, cnt;
5ada918b 3225 int kmsg_console;
1da177e4 3226
b74dbbe1
DV		 3227 WARN_CONSOLE_UNLOCKED();
3228
3229 /* this protects against concurrent oops only */
b0940003 3230 if (!spin_trylock(&printing_lock))
1da177e4
LT		 3231 return;
3232
5ada918b
BW		 3233 kmsg_console = vt_get_kmsg_redirect();
3234 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3235 vc = vc_cons[kmsg_console - 1].d;
1da177e4 3236
1da177e4
LT		 3237 if (!vc_cons_allocated(fg_console)) {
3238 /* impossible */
3239 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3240 goto quit;
3241 }
3242
8d7fc299 3243 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 3244 goto quit;
3245
3246 /* undraw cursor first */
6ca8dfd7 3247 if (con_is_fg(vc))
1da177e4
LT		 3248 hide_cursor(vc);
3249
3250 start = (ushort *)vc->vc_pos;
28bc24fc 3251 start_x = vc->state.x;
6609cff6 3252 cnt = 0;
1da177e4
LT		 3253 while (count--) {
3254 c = *b++;
3701400a
JSS		 3255 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET ||
3256 c == ASCII_BACKSPACE || vc->vc_need_wrap) {
6609cff6 3257 if (cnt && con_is_visible(vc))
28bc24fc 3258 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
6609cff6 3259 cnt = 0;
3701400a 3260 if (c == ASCII_BACKSPACE) {
1da177e4
LT		 3261 bs(vc);
3262 start = (ushort *)vc->vc_pos;
28bc24fc 3263 start_x = vc->state.x;
1da177e4
LT		 3264 continue;
3265 }
3701400a 3266 if (c != ASCII_CAR_RET)
1da177e4
LT		 3267 lf(vc);
3268 cr(vc);
3269 start = (ushort *)vc->vc_pos;
28bc24fc 3270 start_x = vc->state.x;
3701400a 3271 if (c == ASCII_LINEFEED || c == ASCII_CAR_RET)
1da177e4
LT		 3272 continue;
3273 }
6609cff6 3274 vc_uniscr_putc(vc, c);
1da177e4 3275 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 3276 notify_write(vc, c);
1da177e4 3277 cnt++;
28bc24fc 3278 if (vc->state.x == vc->vc_cols - 1) {
1da177e4 3279 vc->vc_need_wrap = 1;
6609cff6
NP		 3280 } else {
3281 vc->vc_pos += 2;
28bc24fc 3282 vc->state.x++;
1da177e4
LT		 3283 }
3284 }
6609cff6 3285 if (cnt && con_is_visible(vc))
28bc24fc 3286 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
1da177e4 3287 set_cursor(vc);
b293d758 3288 notify_update(vc);
1da177e4
LT		 3289
3290quit:
b0940003 3291 spin_unlock(&printing_lock);
1da177e4
LT		 3292}
3293
3294static struct tty_driver *vt_console_device(struct console *c, int *index)
3295{
3296 *index = c->index ? c->index-1 : fg_console;
3297 return console_driver;
3298}
3299
7370a25f
SS		 3300static int vt_console_setup(struct console *co, char *options)
3301{
3302 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3303}
3304
1da177e4
LT		 3305static struct console vt_console_driver = {
3306 .name = "tty",
7370a25f 3307 .setup = vt_console_setup,
1da177e4
LT		 3308 .write = vt_console_print,
3309 .device = vt_console_device,
3310 .unblank = unblank_screen,
3311 .flags = CON_PRINTBUFFER,
3312 .index = -1,
3313};
3314#endif
3315
3316/*
3317 * Handling of Linux-specific VC ioctls
3318 */
3319
3320/*
ac751efa 3321 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3322 *
3323 * There are some functions which don't need it.
3324 *
3325 * There are some functions which can sleep for arbitrary periods
3326 * (paste_selection) but we don't need the lock there anyway.
3327 *
496124e5 3328 * set_selection_user has locking, and definitely needs it
1da177e4
LT		 3329 */
3330
3331int tioclinux(struct tty_struct *tty, unsigned long arg)
3332{
3333 char type, data;
3334 char __user *p = (char __user *)arg;
a0b8a168
JSS		 3335 void __user *param_aligned32 = (u32 __user *)arg + 1;
3336 void __user *param = (void __user *)arg + 1;
1da177e4
LT		 3337 int lines;
3338 int ret;
3339
1da177e4
LT		 3340 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3341 return -EPERM;
3342 if (get_user(type, p))
3343 return -EFAULT;
3344 ret = 0;
04f378b1 3345
6b97370b
JSS		 3346 switch (type) {
3347 case TIOCL_SETSEL:
8d1b43f6
HB		 3348 if (!capable(CAP_SYS_ADMIN))
3349 return -EPERM;
a0b8a168 3350 return set_selection_user(param, tty);
6b97370b 3351 case TIOCL_PASTESEL:
8d1b43f6
HB		 3352 if (!capable(CAP_SYS_ADMIN))
3353 return -EPERM;
71ca6e4b 3354 return paste_selection(tty);
6b97370b
JSS		 3355 case TIOCL_UNBLANKSCREEN:
3356 console_lock();
3357 unblank_screen();
3358 console_unlock();
3359 break;
3360 case TIOCL_SELLOADLUT:
8d1b43f6
HB		 3361 if (!capable(CAP_SYS_ADMIN))
3362 return -EPERM;
d321cd13 3363 return sel_loadlut(param_aligned32);
6b97370b
JSS		 3364 case TIOCL_GETSHIFTSTATE:
3365 /*
3366 * Make it possible to react to Shift+Mousebutton. Note that
3367 * 'shift_state' is an undocumented kernel-internal variable;
3368 * programs not closely related to the kernel should not use
3369 * this.
3370 */
3371 data = vt_get_shift_state();
71ca6e4b 3372 return put_user(data, p);
6b97370b
JSS		 3373 case TIOCL_GETMOUSEREPORTING:
3374 console_lock(); /* May be overkill */
3375 data = mouse_reporting();
3376 console_unlock();
71ca6e4b 3377 return put_user(data, p);
6b97370b 3378 case TIOCL_SETVESABLANK:
d321cd13 3379 return set_vesa_blanking(param);
6b97370b
JSS		 3380 case TIOCL_GETKMSGREDIRECT:
3381 data = vt_get_kmsg_redirect();
71ca6e4b 3382 return put_user(data, p);
6b97370b 3383 case TIOCL_SETKMSGREDIRECT:
71ca6e4b
JSS		 3384 if (!capable(CAP_SYS_ADMIN))
3385 return -EPERM;
3386
3387 if (get_user(data, p+1))
3388 return -EFAULT;
3389
3390 vt_kmsg_redirect(data);
3391
6b97370b
JSS		 3392 break;
3393 case TIOCL_GETFGCONSOLE:
3394 /*
3395 * No locking needed as this is a transiently correct return
3396 * anyway if the caller hasn't disabled switching.
3397 */
71ca6e4b 3398 return fg_console;
6b97370b 3399 case TIOCL_SCROLLCONSOLE:
a0b8a168 3400 if (get_user(lines, (s32 __user *)param_aligned32))
71ca6e4b
JSS		 3401 return -EFAULT;
3402
3403 /*
3404 * Needs the console lock here. Note that lots of other calls
3405 * need fixing before the lock is actually useful!
3406 */
3407 console_lock();
3408 scrollfront(vc_cons[fg_console].d, lines);
3409 console_unlock();
6b97370b
JSS		 3410 break;
3411 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3412 console_lock();
3413 ignore_poke = 1;
3414 do_blank_screen(0);
3415 console_unlock();
3416 break;
3417 case TIOCL_BLANKEDSCREEN:
71ca6e4b 3418 return console_blanked;
6b97370b 3419 default:
71ca6e4b 3420 return -EINVAL;
1da177e4 3421 }
6b97370b 3422
1da177e4
LT		 3423 return ret;
3424}
3425
3426/*
3427 * /dev/ttyN handling
3428 */
3429
95713967 3430static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
1da177e4
LT		 3431{
3432 int retval;
3433
3434 retval = do_con_write(tty, buf, count);
3435 con_flush_chars(tty);
3436
3437 return retval;
3438}
3439
dcaafbe6 3440static int con_put_char(struct tty_struct *tty, u8 ch)
1da177e4 3441{
5d19f546 3442 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3443}
3444
03b3b1a2 3445static unsigned int con_write_room(struct tty_struct *tty)
1da177e4 3446{
6e94dbc7 3447 if (tty->flow.stopped)
1da177e4 3448 return 0;
a88a69c9 3449 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3450}
3451
1da177e4
LT		 3452/*
3453 * con_throttle and con_unthrottle are only used for
3454 * paste_selection(), which has to stuff in a large number of
3455 * characters...
3456 */
3457static void con_throttle(struct tty_struct *tty)
3458{
3459}
3460
3461static void con_unthrottle(struct tty_struct *tty)
3462{
3463 struct vc_data *vc = tty->driver_data;
3464
3465 wake_up_interruptible(&vc->paste_wait);
3466}
3467
3468/*
3469 * Turn the Scroll-Lock LED on when the tty is stopped
3470 */
3471static void con_stop(struct tty_struct *tty)
3472{
3473 int console_num;
3474 if (!tty)
3475 return;
3476 console_num = tty->index;
3477 if (!vc_cons_allocated(console_num))
3478 return;
079c9534 3479 vt_kbd_con_stop(console_num);
1da177e4
LT		 3480}
3481
3482/*
3483 * Turn the Scroll-Lock LED off when the console is started
3484 */
3485static void con_start(struct tty_struct *tty)
3486{
3487 int console_num;
3488 if (!tty)
3489 return;
3490 console_num = tty->index;
3491 if (!vc_cons_allocated(console_num))
3492 return;
079c9534 3493 vt_kbd_con_start(console_num);
1da177e4
LT		 3494}
3495
3496static void con_flush_chars(struct tty_struct *tty)
3497{
b3dd9bef 3498 struct vc_data *vc = tty->driver_data;
1da177e4
LT		 3499
3500 if (in_interrupt()) /* from flush_to_ldisc */
3501 return;
3502
ac751efa 3503 console_lock();
b3dd9bef 3504 set_cursor(vc);
ac751efa 3505 console_unlock();
1da177e4
LT		 3506}
3507
3508/*
3509 * Allocate the console screen memory.
3510 */
bc1e99d9 3511static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3512{
3513 unsigned int currcons = tty->index;
bc1e99d9
JS		 3514 struct vc_data *vc;
3515 int ret;
1da177e4 3516
ac751efa 3517 console_lock();
bc1e99d9
JS		 3518 ret = vc_allocate(currcons);
3519 if (ret)
3520 goto unlock;
feebed65 3521
bc1e99d9 3522 vc = vc_cons[currcons].d;
1da177e4 3523
bc1e99d9
JS		 3524 /* Still being freed */
3525 if (vc->port.tty) {
3526 ret = -ERESTARTSYS;
3527 goto unlock;
3528 }
3529
3530 ret = tty_port_install(&vc->port, driver, tty);
3531 if (ret)
3532 goto unlock;
3533
3534 tty->driver_data = vc;
3535 vc->port.tty = tty;
ca4463bf 3536 tty_port_get(&vc->port);
bc1e99d9
JS		 3537
3538 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3539 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3540 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3541 }
bc1e99d9 3542 if (vc->vc_utf)
adc8d746 3543 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3544 else
adc8d746 3545 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3546unlock:
ac751efa 3547 console_unlock();
1da177e4
LT		 3548 return ret;
3549}
3550
bc1e99d9
JS		 3551static int con_open(struct tty_struct *tty, struct file *filp)
3552{
3553 /* everything done in install */
3554 return 0;
3555}
3556
3557
1da177e4
LT		 3558static void con_close(struct tty_struct *tty, struct file *filp)
3559{
feebed65
AC		 3560 /* Nothing to do - we defer to shutdown */
3561}
1da177e4 3562
feebed65
AC		 3563static void con_shutdown(struct tty_struct *tty)
3564{
3565 struct vc_data *vc = tty->driver_data;
3566 BUG_ON(vc == NULL);
ac751efa 3567 console_lock();
8ce73264 3568 vc->port.tty = NULL;
ac751efa 3569 console_unlock();
1da177e4
LT		 3570}
3571
ca4463bf
EB		 3572static void con_cleanup(struct tty_struct *tty)
3573{
3574 struct vc_data *vc = tty->driver_data;
3575
3576 tty_port_put(&vc->port);
3577}
3578
3855ae1c 3579static int default_color = 7; /* white */
fa6ce9ab
JE		 3580static int default_italic_color = 2; // green (ASCII)
3581static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3582module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3583module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3584module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3585
f68279ca 3586static void vc_init(struct vc_data *vc, int do_clear)
1da177e4
LT		 3587{
3588 int j, k ;
3589
1da177e4
LT		 3590 set_origin(vc);
3591 vc->vc_pos = vc->vc_origin;
3592 reset_vc(vc);
3593 for (j=k=0; j<16; j++) {
3594 vc->vc_palette[k++] = default_red[j] ;
3595 vc->vc_palette[k++] = default_grn[j] ;
3596 vc->vc_palette[k++] = default_blu[j] ;
3597 }
3855ae1c 3598 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3599 vc->vc_ulcolor = default_underline_color;
3600 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3601 vc->vc_halfcolor = 0x08; /* grey */
3602 init_waitqueue_head(&vc->paste_wait);
3603 reset_terminal(vc, do_clear);
3604}
3605
3606/*
3607 * This routine initializes console interrupts, and does nothing
3608 * else. If you want the screen to clear, call tty_write with
3609 * the appropriate escape-sequence.
3610 */
3611
3612static int __init con_init(void)
3613{
3614 const char *display_desc = NULL;
3615 struct vc_data *vc;
3e795de7 3616 unsigned int currcons = 0, i;
1da177e4 3617
ac751efa 3618 console_lock();
1da177e4 3619
805ece2a
AS		 3620 if (!conswitchp)
3621 conswitchp = &dummy_con;
3622 display_desc = conswitchp->con_startup();
1da177e4
LT		 3623 if (!display_desc) {
3624 fg_console = 0;
ac751efa 3625 console_unlock();
1da177e4
LT		 3626 return 0;
3627 }
3628
3e795de7
AD		 3629 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3630 struct con_driver *con_driver = &registered_con_driver[i];
3631
3632 if (con_driver->con == NULL) {
3633 con_driver->con = conswitchp;
3634 con_driver->desc = display_desc;
3635 con_driver->flag = CON_DRIVER_FLAG_INIT;
3636 con_driver->first = 0;
3637 con_driver->last = MAX_NR_CONSOLES - 1;
3638 break;
3639 }
3640 }
3641
3642 for (i = 0; i < MAX_NR_CONSOLES; i++)
3643 con_driver_map[i] = conswitchp;
3644
1da177e4
LT		 3645 if (blankinterval) {
3646 blank_state = blank_normal_wait;
f324edc8 3647 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3648 }
3649
1da177e4 3650 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3651 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3652 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3653 tty_port_init(&vc->port);
dae3e6b6 3654 visual_init(vc, currcons, true);
ce684552 3655 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
a5f4f52e 3656 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
f68279ca 3657 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
1da177e4
LT		 3658 }
3659 currcons = fg_console = 0;
3660 master_display_fg = vc = vc_cons[currcons].d;
3661 set_origin(vc);
3662 save_screen(vc);
28bc24fc 3663 gotoxy(vc, vc->state.x, vc->state.y);
4b8f9361 3664 csi_J(vc, CSI_J_CURSOR_TO_END);
1da177e4 3665 update_screen(vc);
5da527aa 3666 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3667 vc->vc_can_do_color ? "colour" : "mono",
3668 display_desc, vc->vc_cols, vc->vc_rows);
1da177e4 3669
ac751efa 3670 console_unlock();
1da177e4
LT		 3671
3672#ifdef CONFIG_VT_CONSOLE
3673 register_console(&vt_console_driver);
3674#endif
3675 return 0;
3676}
3677console_initcall(con_init);
3678
b68e31d0 3679static const struct tty_operations con_ops = {
bc1e99d9 3680 .install = con_install,
1da177e4
LT		 3681 .open = con_open,
3682 .close = con_close,
3683 .write = con_write,
3684 .write_room = con_write_room,
3685 .put_char = con_put_char,
3686 .flush_chars = con_flush_chars,
1da177e4 3687 .ioctl = vt_ioctl,
e9216651
AB		 3688#ifdef CONFIG_COMPAT
3689 .compat_ioctl = vt_compat_ioctl,
3690#endif
1da177e4
LT		 3691 .stop = con_stop,
3692 .start = con_start,
3693 .throttle = con_throttle,
3694 .unthrottle = con_unthrottle,
8c9a9dd0 3695 .resize = vt_resize,
ca4463bf
EB		 3696 .shutdown = con_shutdown,
3697 .cleanup = con_cleanup,
1da177e4
LT		 3698};
3699
d81ed103
AC		 3700static struct cdev vc0_cdev;
3701
fbc92a34
KS		 3702static ssize_t show_tty_active(struct device *dev,
3703 struct device_attribute *attr, char *buf)
3704{
3705 return sprintf(buf, "tty%d\n", fg_console + 1);
3706}
3707static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3708
1083a7be
TI		 3709static struct attribute *vt_dev_attrs[] = {
3710 &dev_attr_active.attr,
3711 NULL
3712};
3713
3714ATTRIBUTE_GROUPS(vt_dev);
3715
d81ed103 3716int __init vty_init(const struct file_operations *console_fops)
1da177e4 3717{
d81ed103
AC		 3718 cdev_init(&vc0_cdev, console_fops);
3719 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3720 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3721 panic("Couldn't register /dev/tty0 driver\n");
862d8312 3722 tty0dev = device_create_with_groups(&tty_class, NULL,
1083a7be
TI		 3723 MKDEV(TTY_MAJOR, 0), NULL,
3724 vt_dev_groups, "tty0");
fbc92a34
KS		 3725 if (IS_ERR(tty0dev))
3726 tty0dev = NULL;
d81ed103 3727
1da177e4
LT		 3728 vcs_init();
3729
39b7b42b
JS		 3730 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3731 TTY_DRIVER_RESET_TERMIOS);
3732 if (IS_ERR(console_driver))
1da177e4 3733 panic("Couldn't allocate console driver\n");
2f16669d 3734
1da177e4
LT		 3735 console_driver->name = "tty";
3736 console_driver->name_base = 1;
3737 console_driver->major = TTY_MAJOR;
3738 console_driver->minor_start = 1;
3739 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3740 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3741 if (default_utf8)
3742 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3743 tty_set_operations(console_driver, &con_ops);
3744 if (tty_register_driver(console_driver))
3745 panic("Couldn't register console driver\n");
1da177e4
LT		 3746 kbd_init();
3747 console_map_init();
1da177e4
LT		 3748#ifdef CONFIG_MDA_CONSOLE
3749 mda_console_init();
3750#endif
3751 return 0;
3752}
3753
3abe1144
GKH		 3754static const struct class vtconsole_class = {
3755 .name = "vtconsole",
3756};
6db4063c 3757
50e244cc 3758static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3759 int deflt)
1da177e4 3760{
3e795de7
AD		 3761 struct module *owner = csw->owner;
3762 const char *desc = NULL;
3763 struct con_driver *con_driver;
3764 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3765
1da177e4
LT		 3766 if (!try_module_get(owner))
3767 return -ENODEV;
3768
50e244cc 3769 WARN_CONSOLE_UNLOCKED();
1c8ce271 3770
3e795de7
AD		 3771 /* check if driver is registered */
3772 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3773 con_driver = &registered_con_driver[i];
3774
3775 if (con_driver->con == csw) {
3776 desc = con_driver->desc;
3777 retval = 0;
3778 break;
3779 }
3780 }
3781
3782 if (retval)
3783 goto err;
3784
3785 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3786 csw->con_startup();
3787 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3788 }
1c8ce271 3789
1da177e4
LT		 3790 if (deflt) {
3791 if (conswitchp)
3792 module_put(conswitchp->owner);
1c8ce271 3793
1da177e4
LT		 3794 __module_get(owner);
3795 conswitchp = csw;
3796 }
3797
3e795de7
AD		 3798 first = max(first, con_driver->first);
3799 last = min(last, con_driver->last);
3800
1da177e4
LT		 3801 for (i = first; i <= last; i++) {
3802 int old_was_color;
3803 struct vc_data *vc = vc_cons[i].d;
3804
3805 if (con_driver_map[i])
3806 module_put(con_driver_map[i]->owner);
3807 __module_get(owner);
3808 con_driver_map[i] = csw;
3809
3810 if (!vc || !vc->vc_sw)
3811 continue;
3812
3813 j = i;
1c8ce271 3814
6ca8dfd7 3815 if (con_is_visible(vc)) {
4ee1acce 3816 k = i;
1da177e4 3817 save_screen(vc);
4ee1acce
DH		 3818 }
3819
1da177e4
LT		 3820 old_was_color = vc->vc_can_do_color;
3821 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3822 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
dae3e6b6 3823 visual_init(vc, i, false);
1c8ce271 3824 set_origin(vc);
1da177e4
LT		 3825 update_attr(vc);
3826
3827 /* If the console changed between mono <-> color, then
3828 * the attributes in the screenbuf will be wrong. The
3829 * following resets all attributes to something sane.
3830 */
3831 if (old_was_color != vc->vc_can_do_color)
3832 clear_buffer_attributes(vc);
1da177e4 3833 }
4ee1acce 3834
1ffdda95 3835 pr_info("Console: switching ");
1da177e4 3836 if (!deflt)
bccf1da3 3837 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3838 if (j >= 0) {
3839 struct vc_data *vc = vc_cons[j].d;
3840
bccf1da3
JP		 3841 pr_cont("to %s %s %dx%d\n",
3842 vc->vc_can_do_color ? "colour" : "mono",
3843 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3844
3845 if (k >= 0) {
3846 vc = vc_cons[k].d;
3847 update_screen(vc);
3848 }
bccf1da3
JP		 3849 } else {
3850 pr_cont("to %s\n", desc);
3851 }
1da177e4 3852
3e795de7
AD		 3853 retval = 0;
3854err:
1da177e4 3855 module_put(owner);
3e795de7
AD		 3856 return retval;
3857};
1da177e4 3858
50e244cc 3859
13ae6645 3860#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86 3861int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3862{
3e795de7
AD		 3863 struct module *owner = csw->owner;
3864 const struct consw *defcsw = NULL;
3865 struct con_driver *con_driver = NULL, *con_back = NULL;
3866 int i, retval = -ENODEV;
1da177e4 3867
3e795de7
AD		 3868 if (!try_module_get(owner))
3869 return -ENODEV;
3870
e93a9a86 3871 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3872
3873 /* check if driver is registered and if it is unbindable */
3874 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3875 con_driver = &registered_con_driver[i];
3876
3877 if (con_driver->con == csw &&
6db4063c 3878 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3879 retval = 0;
3880 break;
3881 }
3882 }
3883
e93a9a86 3884 if (retval)
3e795de7 3885 goto err;
3e795de7 3886
6db4063c
AD		 3887 retval = -ENODEV;
3888
3e795de7
AD		 3889 /* check if backup driver exists */
3890 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3891 con_back = &registered_con_driver[i];
3892
249f7b3e 3893 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3894 defcsw = con_back->con;
3895 retval = 0;
3896 break;
3897 }
3898 }
3899
e93a9a86 3900 if (retval)
3e795de7 3901 goto err;
3e795de7 3902
e93a9a86 3903 if (!con_is_bound(csw))
3e795de7 3904 goto err;
3e795de7
AD		 3905
3906 first = max(first, con_driver->first);
3907 last = min(last, con_driver->last);
3908
3909 for (i = first; i <= last; i++) {
1da177e4
LT		 3910 if (con_driver_map[i] == csw) {
3911 module_put(csw->owner);
3912 con_driver_map[i] = NULL;
3913 }
3e795de7
AD		 3914 }
3915
3916 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3917 const struct consw *defconsw = conswitchp;
3918
3e795de7
AD		 3919 defcsw->con_startup();
3920 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3921 /*
3922 * vgacon may change the default driver to point
3923 * to dummycon, we restore it here...
3924 */
3925 conswitchp = defconsw;
3e795de7
AD		 3926 }
3927
3928 if (!con_is_bound(csw))
3929 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3930
6db4063c 3931 /* ignore return value, binding should not fail */
50e244cc 3932 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3933err:
3934 module_put(owner);
3935 return retval;
3936
3937}
e93a9a86 3938EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3939
6db4063c
AD		 3940static int vt_bind(struct con_driver *con)
3941{
3942 const struct consw *defcsw = NULL, *csw = NULL;
3943 int i, more = 1, first = -1, last = -1, deflt = 0;
3944
77232f79 3945 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3946 goto err;
3947
3948 csw = con->con;
3949
3950 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3951 struct con_driver *con = &registered_con_driver[i];
3952
3953 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3954 defcsw = con->con;
3955 break;
3956 }
3957 }
3958
3959 if (!defcsw)
3960 goto err;
3961
3962 while (more) {
3963 more = 0;
3964
3965 for (i = con->first; i <= con->last; i++) {
3966 if (con_driver_map[i] == defcsw) {
3967 if (first == -1)
3968 first = i;
3969 last = i;
3970 more = 1;
3971 } else if (first != -1)
3972 break;
3973 }
3974
3975 if (first == 0 && last == MAX_NR_CONSOLES -1)
3976 deflt = 1;
3977
4c215fe8 3978 if (first != -1)
c62a1e57 3979 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3980
3981 first = -1;
3982 last = -1;
3983 deflt = 0;
3984 }
3985
3986err:
3987 return 0;
3988}
3989
3990static int vt_unbind(struct con_driver *con)
3991{
3992 const struct consw *csw = NULL;
3993 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3994 int ret;
6db4063c 3995
77232f79 3996 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3997 goto err;
3998
3999 csw = con->con;
4000
4001 while (more) {
4002 more = 0;
4003
4004 for (i = con->first; i <= con->last; i++) {
4005 if (con_driver_map[i] == csw) {
4006 if (first == -1)
4007 first = i;
4008 last = i;
4009 more = 1;
4010 } else if (first != -1)
4011 break;
4012 }
4013
4014 if (first == 0 && last == MAX_NR_CONSOLES -1)
4015 deflt = 1;
4016
618f2b90 4017 if (first != -1) {
f418f2ec 4018 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 4019 if (ret != 0)
4020 return ret;
618f2b90 4021 }
6db4063c
AD		 4022
4023 first = -1;
4024 last = -1;
4025 deflt = 0;
4026 }
4027
4028err:
4029 return 0;
4030}
13ae6645
AD		 4031#else
4032static inline int vt_bind(struct con_driver *con)
4033{
4034 return 0;
4035}
4036static inline int vt_unbind(struct con_driver *con)
4037{
4038 return 0;
4039}
4040#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 4041
805952a8 4042static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 4043 const char *buf, size_t count)
4044{
805952a8 4045 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 4046 int bind = simple_strtoul(buf, NULL, 0);
4047
4c215fe8
ID		 4048 console_lock();
4049
6db4063c
AD		 4050 if (bind)
4051 vt_bind(con);
4052 else
4053 vt_unbind(con);
4054
4c215fe8
ID		 4055 console_unlock();
4056
6db4063c
AD		 4057 return count;
4058}
4059
805952a8
GKH		 4060static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
4061 char *buf)
6db4063c 4062{
805952a8 4063 struct con_driver *con = dev_get_drvdata(dev);
61d51456
DV		 4064 int bind;
4065
4066 console_lock();
4067 bind = con_is_bound(con->con);
4068 console_unlock();
6db4063c 4069
ebaed53c 4070 return sysfs_emit(buf, "%i\n", bind);
6db4063c
AD		 4071}
4072
805952a8
GKH		 4073static ssize_t show_name(struct device *dev, struct device_attribute *attr,
4074 char *buf)
6db4063c 4075{
805952a8 4076 struct con_driver *con = dev_get_drvdata(dev);
6db4063c 4077
ebaed53c 4078 return sysfs_emit(buf, "%s %s\n",
6db4063c
AD		 4079 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
4080 con->desc);
4081
4082}
4083
1083a7be
TI		 4084static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
4085static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
4086
4087static struct attribute *con_dev_attrs[] = {
4088 &dev_attr_bind.attr,
4089 &dev_attr_name.attr,
4090 NULL
6db4063c
AD		 4091};
4092
1083a7be
TI		 4093ATTRIBUTE_GROUPS(con_dev);
4094
805952a8 4095static int vtconsole_init_device(struct con_driver *con)
6db4063c 4096{
928e964f 4097 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 4098 return 0;
6db4063c
AD		 4099}
4100
805952a8 4101static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 4102{
1083a7be 4103 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 4104}
4105
3e795de7
AD		 4106/**
4107 * con_is_bound - checks if driver is bound to the console
4108 * @csw: console driver
4109 *
4110 * RETURNS: zero if unbound, nonzero if bound
4111 *
4112 * Drivers can call this and if zero, they should release
60234365 4113 * all resources allocated on &consw.con_startup()
3e795de7
AD		 4114 */
4115int con_is_bound(const struct consw *csw)
4116{
4117 int i, bound = 0;
4118
ddde3c18
DV		 4119 WARN_CONSOLE_UNLOCKED();
4120
3e795de7
AD		 4121 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4122 if (con_driver_map[i] == csw) {
4123 bound = 1;
4124 break;
4125 }
4126 }
4127
4128 return bound;
4129}
4130EXPORT_SYMBOL(con_is_bound);
4131
ddde3c18
DV		 4132/**
4133 * con_is_visible - checks whether the current console is visible
4134 * @vc: virtual console
4135 *
4136 * RETURNS: zero if not visible, nonzero if visible
4137 */
4138bool con_is_visible(const struct vc_data *vc)
4139{
4140 WARN_CONSOLE_UNLOCKED();
4141
4142 return *vc->vc_display_fg == vc;
4143}
4144EXPORT_SYMBOL(con_is_visible);
4145
b45cfba4
JB		 4146/**
4147 * con_debug_enter - prepare the console for the kernel debugger
ea239f1e 4148 * @vc: virtual console
b45cfba4
JB		 4149 *
4150 * Called when the console is taken over by the kernel debugger, this
4151 * function needs to save the current console state, then put the console
4152 * into a state suitable for the kernel debugger.
b45cfba4 4153 */
7995c30d 4154void con_debug_enter(struct vc_data *vc)
b45cfba4 4155{
b45cfba4
JB		 4156 saved_fg_console = fg_console;
4157 saved_last_console = last_console;
4158 saved_want_console = want_console;
4159 saved_vc_mode = vc->vc_mode;
beed5336 4160 saved_console_blanked = console_blanked;
b45cfba4
JB		 4161 vc->vc_mode = KD_TEXT;
4162 console_blanked = 0;
4163 if (vc->vc_sw->con_debug_enter)
7995c30d 4164 vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 4165#ifdef CONFIG_KGDB_KDB
4166 /* Set the initial LINES variable if it is not already set */
4167 if (vc->vc_rows < 999) {
4168 int linecount;
4169 char lns[4];
4170 const char *setargs[3] = {
4171 "set",
4172 "LINES",
4173 lns,
4174 };
4175 if (kdbgetintenv(setargs[0], &linecount)) {
4176 snprintf(lns, 4, "%i", vc->vc_rows);
4177 kdb_set(2, setargs);
4178 }
4179 }
17b572e8
JW		 4180 if (vc->vc_cols < 999) {
4181 int colcount;
4182 char cols[4];
4183 const char *setargs[3] = {
4184 "set",
4185 "COLUMNS",
4186 cols,
4187 };
4188 if (kdbgetintenv(setargs[0], &colcount)) {
4189 snprintf(cols, 4, "%i", vc->vc_cols);
4190 kdb_set(2, setargs);
4191 }
4192 }
81d44507 4193#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 4194}
4195EXPORT_SYMBOL_GPL(con_debug_enter);
4196
4197/**
4198 * con_debug_leave - restore console state
b45cfba4
JB		 4199 *
4200 * Restore the console state to what it was before the kernel debugger
4201 * was invoked.
b45cfba4 4202 */
7995c30d 4203void con_debug_leave(void)
b45cfba4
JB		 4204{
4205 struct vc_data *vc;
b45cfba4
JB		 4206
4207 fg_console = saved_fg_console;
4208 last_console = saved_last_console;
4209 want_console = saved_want_console;
beed5336 4210 console_blanked = saved_console_blanked;
b45cfba4
JB		 4211 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4212
4213 vc = vc_cons[fg_console].d;
4214 if (vc->vc_sw->con_debug_leave)
7995c30d 4215 vc->vc_sw->con_debug_leave(vc);
b45cfba4
JB		 4216}
4217EXPORT_SYMBOL_GPL(con_debug_leave);
4218
50e244cc 4219static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 4220{
4221 struct module *owner = csw->owner;
4222 struct con_driver *con_driver;
4223 const char *desc;
96317e9e 4224 int i, retval;
3e795de7 4225
50e244cc
AC		 4226 WARN_CONSOLE_UNLOCKED();
4227
3e795de7
AD		 4228 if (!try_module_get(owner))
4229 return -ENODEV;
4230
3e795de7
AD		 4231 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4232 con_driver = &registered_con_driver[i];
4233
4234 /* already registered */
96317e9e 4235 if (con_driver->con == csw) {
c55c63c6 4236 retval = -EBUSY;
96317e9e
JS		 4237 goto err;
4238 }
3e795de7
AD		 4239 }
4240
3e795de7 4241 desc = csw->con_startup();
6798df4c
JS		 4242 if (!desc) {
4243 retval = -ENODEV;
3e795de7 4244 goto err;
6798df4c 4245 }
3e795de7
AD		 4246
4247 retval = -EINVAL;
4248
4249 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4250 con_driver = &registered_con_driver[i];
4251
d364b5c3
ID		 4252 if (con_driver->con == NULL &&
4253 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 4254 con_driver->con = csw;
4255 con_driver->desc = desc;
6db4063c
AD		 4256 con_driver->node = i;
4257 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 4258 CON_DRIVER_FLAG_INIT;
4259 con_driver->first = first;
4260 con_driver->last = last;
4261 retval = 0;
4262 break;
4263 }
4264 }
4265
6db4063c
AD		 4266 if (retval)
4267 goto err;
4268
1083a7be 4269 con_driver->dev =
3abe1144 4270 device_create_with_groups(&vtconsole_class, NULL,
1083a7be
TI		 4271 MKDEV(0, con_driver->node),
4272 con_driver, con_dev_groups,
4273 "vtcon%i", con_driver->node);
805952a8 4274 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 4275 pr_warn("Unable to create device for %s; errno = %ld\n",
4276 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 4277 con_driver->dev = NULL;
6db4063c 4278 } else {
805952a8 4279 vtconsole_init_device(con_driver);
6db4063c 4280 }
928e964f 4281
3e795de7 4282err:
3e795de7
AD		 4283 module_put(owner);
4284 return retval;
4285}
50e244cc 4286
3e795de7
AD		 4287
4288/**
50539dd4 4289 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 4290 * @csw: console driver
4291 *
4292 * DESCRIPTION: All drivers that registers to the console layer must
4293 * call this function upon exit, or if the console driver is in a state
4294 * where it won't be able to handle console services, such as the
4295 * framebuffer console without loaded framebuffer drivers.
4296 *
4297 * The driver must unbind first prior to unregistration.
4298 */
e93a9a86
TI		 4299int do_unregister_con_driver(const struct consw *csw)
4300{
d9c660e7 4301 int i;
3e795de7
AD		 4302
4303 /* cannot unregister a bound driver */
4304 if (con_is_bound(csw))
d9c660e7
DV		 4305 return -EBUSY;
4306
4307 if (csw == conswitchp)
4308 return -EINVAL;
3e795de7
AD		 4309
4310 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4311 struct con_driver *con_driver = &registered_con_driver[i];
4312
2cf30f75 4313 if (con_driver->con == csw) {
d364b5c3
ID		 4314 /*
4315 * Defer the removal of the sysfs entries since that
4316 * will acquire the kernfs s_active lock and we can't
4317 * acquire this lock while holding the console lock:
4318 * the unbind sysfs entry imposes already the opposite
4319 * order. Reset con already here to prevent any later
4320 * lookup to succeed and mark this slot as zombie, so
4321 * it won't get reused until we complete the removal
4322 * in the deferred work.
4323 */
3e795de7 4324 con_driver->con = NULL;
d364b5c3
ID		 4325 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4326 schedule_work(&con_driver_unregister_work);
4327
d9c660e7 4328 return 0;
3e795de7
AD		 4329 }
4330 }
d9c660e7
DV		 4331
4332 return -ENODEV;
3e795de7 4333}
e93a9a86 4334EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4335
d364b5c3
ID		 4336static void con_driver_unregister_callback(struct work_struct *ignored)
4337{
4338 int i;
4339
4340 console_lock();
4341
4342 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4343 struct con_driver *con_driver = &registered_con_driver[i];
4344
4345 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4346 continue;
4347
4348 console_unlock();
4349
4350 vtconsole_deinit_device(con_driver);
3abe1144 4351 device_destroy(&vtconsole_class, MKDEV(0, con_driver->node));
d364b5c3
ID		 4352
4353 console_lock();
4354
4355 if (WARN_ON_ONCE(con_driver->con))
4356 con_driver->con = NULL;
4357 con_driver->desc = NULL;
4358 con_driver->dev = NULL;
4359 con_driver->node = 0;
4360 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4361 con_driver->flag = 0;
4362 con_driver->first = 0;
4363 con_driver->last = 0;
4364 }
4365
4366 console_unlock();
4367}
4368
3e795de7
AD		 4369/*
4370 * If we support more console drivers, this function is used
4371 * when a driver wants to take over some existing consoles
4372 * and become default driver for newly opened ones.
4373 *
0095ab42 4374 * do_take_over_console is basically a register followed by bind
50e244cc
AC		 4375 */
4376int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4377{
4378 int err;
4379
4380 err = do_register_con_driver(csw, first, last);
4381 /*
4382 * If we get an busy error we still want to bind the console driver
4383 * and return success, as we may have unbound the console driver
4384 * but not unregistered it.
4385 */
4386 if (err == -EBUSY)
4387 err = 0;
4388 if (!err)
4389 do_bind_con_driver(csw, first, last, deflt);
4390
4391 return err;
4392}
4393EXPORT_SYMBOL_GPL(do_take_over_console);
4394
3e795de7
AD		 4395
4396/*
4397 * give_up_console is a wrapper to unregister_con_driver. It will only
4398 * work if driver is fully unbound.
4399 */
4400void give_up_console(const struct consw *csw)
4401{
70125e76
WY		 4402 console_lock();
4403 do_unregister_con_driver(csw);
4404 console_unlock();
3e795de7 4405}
921234d7 4406EXPORT_SYMBOL(give_up_console);
3e795de7 4407
6db4063c 4408static int __init vtconsole_class_init(void)
3e795de7 4409{
6db4063c 4410 int i;
3e795de7 4411
3abe1144
GKH		 4412 i = class_register(&vtconsole_class);
4413 if (i)
4414 pr_warn("Unable to create vt console class; errno = %d\n", i);
3e795de7 4415
6db4063c 4416 /* Add system drivers to sysfs */
3e795de7
AD		 4417 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4418 struct con_driver *con = &registered_con_driver[i];
4419
805952a8 4420 if (con->con && !con->dev) {
1083a7be 4421 con->dev =
3abe1144 4422 device_create_with_groups(&vtconsole_class, NULL,
1083a7be
TI		 4423 MKDEV(0, con->node),
4424 con, con_dev_groups,
4425 "vtcon%i", con->node);
6db4063c 4426
805952a8 4427 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4428 pr_warn("Unable to create device for %s; errno = %ld\n",
4429 con->desc, PTR_ERR(con->dev));
805952a8 4430 con->dev = NULL;
6db4063c 4431 } else {
805952a8 4432 vtconsole_init_device(con);
6db4063c 4433 }
3e795de7 4434 }
3e795de7
AD		 4435 }
4436
3e795de7
AD		 4437 return 0;
4438}
6db4063c 4439postcore_initcall(vtconsole_class_init);
3e795de7 4440
1da177e4
LT		 4441/*
4442 * Screen blanking
4443 */
4444
a0b8a168 4445static int set_vesa_blanking(u8 __user *mode_user)
1da177e4 4446{
a0b8a168 4447 u8 mode;
403aac96 4448
a0b8a168 4449 if (get_user(mode, mode_user))
403aac96
YY		 4450 return -EFAULT;
4451
d321cd13 4452 console_lock();
0a58d83d 4453 vesa_blank_mode = (mode <= VESA_BLANK_MAX) ? mode : VESA_NO_BLANKING;
d321cd13
JSS		 4454 console_unlock();
4455
403aac96 4456 return 0;
1da177e4
LT		 4457}
4458
1da177e4
LT		 4459void do_blank_screen(int entering_gfx)
4460{
4461 struct vc_data *vc = vc_cons[fg_console].d;
4462 int i;
4463
a135513c
DV		 4464 might_sleep();
4465
1da177e4
LT		 4466 WARN_CONSOLE_UNLOCKED();
4467
4468 if (console_blanked) {
4469 if (blank_state == blank_vesa_wait) {
4470 blank_state = blank_off;
d060a321 4471 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4472 }
4473 return;
4474 }
1da177e4
LT		 4475
4476 /* entering graphics mode? */
4477 if (entering_gfx) {
4478 hide_cursor(vc);
4479 save_screen(vc);
15d0fff7 4480 vc->vc_sw->con_blank(vc, VESA_VSYNC_SUSPEND, 1);
1da177e4 4481 console_blanked = fg_console + 1;
b6e8f00f 4482 blank_state = blank_off;
1da177e4
LT		 4483 set_origin(vc);
4484 return;
4485 }
4486
b6e8f00f 4487 blank_state = blank_off;
4488
1da177e4
LT		 4489 /* don't blank graphics */
4490 if (vc->vc_mode != KD_TEXT) {
4491 console_blanked = fg_console + 1;
4492 return;
4493 }
4494
4495 hide_cursor(vc);
4496 del_timer_sync(&console_timer);
4497 blank_timer_expired = 0;
4498
4499 save_screen(vc);
4500 /* In case we need to reset origin, blanking hook returns 1 */
15d0fff7
JSS		 4501 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? VESA_VSYNC_SUSPEND :
4502 (vesa_blank_mode + 1), 0);
1da177e4
LT		 4503 console_blanked = fg_console + 1;
4504 if (i)
4505 set_origin(vc);
4506
4507 if (console_blank_hook && console_blank_hook(1))
4508 return;
4509
d060a321 4510 if (vesa_off_interval && vesa_blank_mode) {
030babac 4511 blank_state = blank_vesa_wait;
1da177e4
LT		 4512 mod_timer(&console_timer, jiffies + vesa_off_interval);
4513 }
8b92e87d 4514 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4515}
4516EXPORT_SYMBOL(do_blank_screen);
4517
4518/*
4519 * Called by timer as well as from vt_console_driver
4520 */
4521void do_unblank_screen(int leaving_gfx)
4522{
4523 struct vc_data *vc;
4524
4525 /* This should now always be called from a "sane" (read: can schedule)
4526 * context for the sake of the low level drivers, except in the special
4527 * case of oops_in_progress
4528 */
4529 if (!oops_in_progress)
4530 might_sleep();
4531
4532 WARN_CONSOLE_UNLOCKED();
4533
4534 ignore_poke = 0;
4535 if (!console_blanked)
4536 return;
4537 if (!vc_cons_allocated(fg_console)) {
4538 /* impossible */
e620e548
JP		 4539 pr_warn("unblank_screen: tty %d not allocated ??\n",
4540 fg_console + 1);
1da177e4
LT		 4541 return;
4542 }
4543 vc = vc_cons[fg_console].d;
8d7fc299 4544 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4545 return; /* but leave console_blanked != 0 */
4546
4547 if (blankinterval) {
f324edc8 4548 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4549 blank_state = blank_normal_wait;
4550 }
4551
4552 console_blanked = 0;
15d0fff7 4553 if (vc->vc_sw->con_blank(vc, VESA_NO_BLANKING, leaving_gfx))
1da177e4
LT		 4554 /* Low-level driver cannot restore -> do it ourselves */
4555 update_screen(vc);
4556 if (console_blank_hook)
4557 console_blank_hook(0);
4558 set_palette(vc);
4559 set_cursor(vc);
8b92e87d 4560 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4561}
4562EXPORT_SYMBOL(do_unblank_screen);
4563
4564/*
4565 * This is called by the outside world to cause a forced unblank, mostly for
4566 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4567 * call it with 1 as an argument and so force a mode restore... that may kill
4568 * X or at least garbage the screen but would also make the Oops visible...
4569 */
0a64ce6e 4570static void unblank_screen(void)
1da177e4
LT		 4571{
4572 do_unblank_screen(0);
4573}
4574
4575/*
70522e12 4576 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4577 * (console operations can still happen at irq time, but only from printk which
70522e12 4578 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4579 */
24ed960a 4580static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4581{
4582 blank_timer_expired = 1;
4583 schedule_work(&console_work);
4584}
4585
4586void poke_blanked_console(void)
4587{
4588 WARN_CONSOLE_UNLOCKED();
4589
4590 /* Add this so we quickly catch whoever might call us in a non
4591 * safe context. Nowadays, unblank_screen() isn't to be called in
4592 * atomic contexts and is allowed to schedule (with the special case
4593 * of oops_in_progress, but that isn't of any concern for this
4594 * function. --BenH.
4595 */
4596 might_sleep();
4597
4598 /* This isn't perfectly race free, but a race here would be mostly harmless,
22fce66c 4599 * at worst, we'll do a spurious blank and it's unlikely
1da177e4
LT		 4600 */
4601 del_timer(&console_timer);
4602 blank_timer_expired = 0;
4603
4604 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4605 return;
4606 if (console_blanked)
4607 unblank_screen();
4608 else if (blankinterval) {
f324edc8 4609 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4610 blank_state = blank_normal_wait;
4611 }
4612}
4613
4614/*
4615 * Palettes
4616 */
4617
4618static void set_palette(struct vc_data *vc)
4619{
4620 WARN_CONSOLE_UNLOCKED();
4621
709280da 4622 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4623 vc->vc_sw->con_set_palette(vc, color_table);
4624}
4625
1da177e4
LT		 4626/*
4627 * Load palette into the DAC registers. arg points to a colour
4628 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4629 */
4630
4631int con_set_cmap(unsigned char __user *arg)
4632{
871bdea6
MG		 4633 int i, j, k;
4634 unsigned char colormap[3*16];
4635
4636 if (copy_from_user(colormap, arg, sizeof(colormap)))
4637 return -EFAULT;
1da177e4 4638
ac751efa 4639 console_lock();
871bdea6
MG		 4640 for (i = k = 0; i < 16; i++) {
4641 default_red[i] = colormap[k++];
4642 default_grn[i] = colormap[k++];
4643 default_blu[i] = colormap[k++];
4644 }
4645 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4646 if (!vc_cons_allocated(i))
4647 continue;
4648 for (j = k = 0; j < 16; j++) {
4649 vc_cons[i].d->vc_palette[k++] = default_red[j];
4650 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4651 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4652 }
4653 set_palette(vc_cons[i].d);
4654 }
ac751efa 4655 console_unlock();
1da177e4 4656
871bdea6 4657 return 0;
1da177e4
LT		 4658}
4659
4660int con_get_cmap(unsigned char __user *arg)
4661{
871bdea6
MG		 4662 int i, k;
4663 unsigned char colormap[3*16];
1da177e4 4664
ac751efa 4665 console_lock();
871bdea6
MG		 4666 for (i = k = 0; i < 16; i++) {
4667 colormap[k++] = default_red[i];
4668 colormap[k++] = default_grn[i];
4669 colormap[k++] = default_blu[i];
4670 }
ac751efa 4671 console_unlock();
1da177e4 4672
871bdea6
MG		 4673 if (copy_to_user(arg, colormap, sizeof(colormap)))
4674 return -EFAULT;
4675
4676 return 0;
1da177e4
LT		 4677}
4678
4679void reset_palette(struct vc_data *vc)
4680{
4681 int j, k;
4682 for (j=k=0; j<16; j++) {
4683 vc->vc_palette[k++] = default_red[j];
4684 vc->vc_palette[k++] = default_grn[j];
4685 vc->vc_palette[k++] = default_blu[j];
4686 }
4687 set_palette(vc);
4688}
4689
4690/*
4691 * Font switching
4692 *
05e2600c
ST		 4693 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4694 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4695 * (shorts/ints, depending on width) reserved for each character which is
4696 * kinda wasty, but this is done in order to maintain compatibility with the
4697 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4698 * into its favorite format (maybe we should add a `fontoffset' field to the
4699 * `display' structure so we won't have to convert the fontdata all the time.
1da177e4
LT		 4700 * /Jes
4701 */
4702
05e2600c
ST		 4703#define max_font_width 64
4704#define max_font_height 128
4705#define max_font_glyphs 512
4706#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
1da177e4
LT		 4707
4708static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4709{
4710 struct console_font font;
4711 int rc = -EINVAL;
4712 int c;
24d69384 4713 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
1da177e4 4714
18365ebf
ST		 4715 if (vpitch > max_font_height)
4716 return -EINVAL;
4717
1da177e4 4718 if (op->data) {
05e2600c 4719 font.data = kvmalloc(max_font_size, GFP_KERNEL);
1da177e4
LT		 4720 if (!font.data)
4721 return -ENOMEM;
4722 } else
4723 font.data = NULL;
4724
ac751efa 4725 console_lock();
edab558f
AC		 4726 if (vc->vc_mode != KD_TEXT)
4727 rc = -EINVAL;
4728 else if (vc->vc_sw->con_font_get)
24d69384 4729 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
1da177e4
LT		 4730 else
4731 rc = -ENOSYS;
ac751efa 4732 console_unlock();
1da177e4
LT		 4733
4734 if (rc)
4735 goto out;
4736
24d69384 4737 c = (font.width+7)/8 * vpitch * font.charcount;
04f378b1 4738
1da177e4
LT		 4739 if (op->data && font.charcount > op->charcount)
4740 rc = -ENOSPC;
ff2047fb
JS		 4741 if (font.width > op->width || font.height > op->height)
4742 rc = -ENOSPC;
1da177e4
LT		 4743 if (rc)
4744 goto out;
4745
4746 op->height = font.height;
4747 op->width = font.width;
4748 op->charcount = font.charcount;
4749
4750 if (op->data && copy_to_user(op->data, font.data, c))
4751 rc = -EFAULT;
4752
4753out:
05e2600c 4754 kvfree(font.data);
1da177e4
LT		 4755 return rc;
4756}
4757
fd0f631f 4758static int con_font_set(struct vc_data *vc, const struct console_font_op *op)
1da177e4
LT		 4759{
4760 struct console_font font;
4761 int rc = -EINVAL;
4762 int size;
24d69384 4763 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
1da177e4
LT		 4764
4765 if (vc->vc_mode != KD_TEXT)
4766 return -EINVAL;
4767 if (!op->data)
4768 return -EINVAL;
05e2600c 4769 if (op->charcount > max_font_glyphs)
1da177e4 4770 return -EINVAL;
05e2600c
ST		 4771 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4772 op->height > max_font_height)
8ffb8209 4773 return -EINVAL;
24d69384
ST		 4774 if (vpitch < op->height)
4775 return -EINVAL;
4776 size = (op->width+7)/8 * vpitch * op->charcount;
8ffb8209
MX		 4777 if (size > max_font_size)
4778 return -ENOSPC;
4779
4780 font.data = memdup_user(op->data, size);
4781 if (IS_ERR(font.data))
4782 return PTR_ERR(font.data);
4783
1da177e4 4784 font.charcount = op->charcount;
1da177e4 4785 font.width = op->width;
8ffb8209
MX		 4786 font.height = op->height;
4787
ac751efa 4788 console_lock();
edab558f
AC		 4789 if (vc->vc_mode != KD_TEXT)
4790 rc = -EINVAL;
566f9c9f
HD		 4791 else if (vc->vc_sw->con_font_set) {
4792 if (vc_is_sel(vc))
4793 clear_selection();
24d69384 4794 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
566f9c9f 4795 } else
1da177e4 4796 rc = -ENOSYS;
ac751efa 4797 console_unlock();
1da177e4
LT		 4798 kfree(font.data);
4799 return rc;
4800}
4801
4802static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4803{
4804 struct console_font font = {.width = op->width, .height = op->height};
4805 char name[MAX_FONT_NAME];
4806 char *s = name;
4807 int rc;
4808
1da177e4
LT		 4809
4810 if (!op->data)
4811 s = NULL;
4812 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4813 return -EFAULT;
4814 else
4815 name[MAX_FONT_NAME - 1] = 0;
4816
ac751efa 4817 console_lock();
edab558f
AC		 4818 if (vc->vc_mode != KD_TEXT) {
4819 console_unlock();
4820 return -EINVAL;
4821 }
566f9c9f
HD		 4822 if (vc->vc_sw->con_font_default) {
4823 if (vc_is_sel(vc))
4824 clear_selection();
1da177e4 4825 rc = vc->vc_sw->con_font_default(vc, &font, s);
566f9c9f 4826 } else
1da177e4 4827 rc = -ENOSYS;
ac751efa 4828 console_unlock();
1da177e4
LT		 4829 if (!rc) {
4830 op->width = font.width;
4831 op->height = font.height;
4832 }
4833 return rc;
4834}
4835
1da177e4
LT		 4836int con_font_op(struct vc_data *vc, struct console_font_op *op)
4837{
4838 switch (op->op) {
4839 case KD_FONT_OP_SET:
24d69384 4840 case KD_FONT_OP_SET_TALL:
1da177e4
LT		 4841 return con_font_set(vc, op);
4842 case KD_FONT_OP_GET:
24d69384 4843 case KD_FONT_OP_GET_TALL:
1da177e4
LT		 4844 return con_font_get(vc, op);
4845 case KD_FONT_OP_SET_DEFAULT:
4846 return con_font_default(vc, op);
4847 case KD_FONT_OP_COPY:
3c4e0dff
DV		 4848 /* was buggy and never really used */
4849 return -EINVAL;
1da177e4
LT		 4850 }
4851 return -ENOSYS;
4852}
4853
4854/*
4855 * Interface exported to selection and vcs.
4856 */
4857
4858/* used by selection */
d73568c4 4859u16 screen_glyph(const struct vc_data *vc, int offset)
1da177e4 4860{
b8209f69 4861 u16 w = scr_readw(screenpos(vc, offset, true));
1da177e4
LT		 4862 u16 c = w & 0xff;
4863
4864 if (w & vc->vc_hi_font_mask)
4865 c |= 0x100;
4866 return c;
4867}
f7511d5f 4868EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4869
d73568c4 4870u32 screen_glyph_unicode(const struct vc_data *vc, int n)
9bfdc261 4871{
feb36abb
JSS		 4872 u32 **uni_lines = vc->vc_uni_lines;
4873
4874 if (uni_lines)
4875 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
9bfdc261 4876
d9ebb906 4877 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
9bfdc261
AB		 4878}
4879EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4880
1da177e4 4881/* used by vcs - note the word offset */
b8209f69 4882unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
1da177e4
LT		 4883{
4884 return screenpos(vc, 2 * w_offset, viewed);
4885}
88867e3d 4886EXPORT_SYMBOL_GPL(screen_pos);
1da177e4 4887
a5c6bd80 4888void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
1da177e4 4889{
8a085494 4890 /* clamp values if they don't fit */
a5c6bd80
JS		 4891 xy[0] = min(vc->state.x, 0xFFu);
4892 xy[1] = min(vc->state.y, 0xFFu);
1da177e4
LT		 4893}
4894
a5c6bd80 4895void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
1da177e4 4896{
9477e260 4897 hide_cursor(vc);
a5c6bd80 4898 gotoxy(vc, xy[0], xy[1]);
1da177e4
LT		 4899 set_cursor(vc);
4900}
4901
d73568c4 4902u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
1da177e4
LT		 4903{
4904 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4905 return softcursor_original;
4906 return scr_readw(org);
4907}
4908
4909void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4910{
4911 scr_writew(val, org);
4912 if ((unsigned long)org == vc->vc_pos) {
4913 softcursor_original = -1;
4914 add_softcursor(vc);
4915 }
4916}
4917
432c9ed2
NP		 4918void vcs_scr_updated(struct vc_data *vc)
4919{
4920 notify_update(vc);
4921}
Linux 6.x block layer and io_uring tree(s)