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tty: Restrict access to TIOCLINUX' copy-and-paste subcommands
[linux-2.6-block.git] / drivers / tty / vt / vt.c
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e3b3d0f5 1// SPDX-License-Identifier: GPL-2.0
1da177e4 2/*
1da177e4
LT		 3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 61 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
d4328b40
AT		 65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
3f07c014 76#include <linux/sched/signal.h>
1da177e4
LT		 77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
9a98e7a8 84#include <linux/vmalloc.h>
1da177e4
LT		 85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
c831c338 89#include <linux/mutex.h>
1da177e4
LT		 90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
1da177e4 97#include <linux/workqueue.h>
1da177e4
LT		 98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
b293d758 101#include <linux/notifier.h>
d81ed103
AC		 102#include <linux/device.h>
103#include <linux/io.h>
d81ed103 104#include <linux/uaccess.h>
81d44507 105#include <linux/kdb.h>
74c807ce 106#include <linux/ctype.h>
f0a8d84f 107#include <linux/bsearch.h>
d541ae4e 108#include <linux/gcd.h>
1da177e4 109
3e795de7 110#define MAX_NR_CON_DRIVER 16
1da177e4 111
6db4063c 112#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 115#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
805952a8 120 struct device *dev;
6db4063c 121 int node;
3e795de7
AD		 122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 128const struct consw *conswitchp;
129
1da177e4
LT		 130/*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133#define DEFAULT_BELL_PITCH 750
134#define DEFAULT_BELL_DURATION (HZ/8)
bd63364c 135#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 136
1da177e4 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);
403aac96 148static int set_vesa_blanking(char __user *p);
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
LT		 177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 179static int vesa_off_interval;
a4199f5e 180static int blankinterval;
f324edc8 181core_param(consoleblank, blankinterval, int, 0444);
1da177e4 182
65f27f38 183static DECLARE_WORK(console_work, console_callback);
d364b5c3 184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
b45cfba4 190 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 191 */
192int fg_console;
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
d73568c4 289static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
b8209f69 290 bool viewed)
1da177e4
LT		 291{
292 unsigned short *p;
293
294 if (!viewed)
295 p = (unsigned short *)(vc->vc_origin + offset);
296 else if (!vc->vc_sw->con_screen_pos)
297 p = (unsigned short *)(vc->vc_visible_origin + offset);
298 else
299 p = vc->vc_sw->con_screen_pos(vc, offset);
300 return p;
301}
302
e33ac1c1 303/* Called from the keyboard irq path.. */
1da177e4
LT		 304static inline void scrolldelta(int lines)
305{
e33ac1c1
AC		 306 /* FIXME */
307 /* scrolldelta needs some kind of consistency lock, but the BKL was
308 and still is not protecting versus the scheduled back end */
1da177e4
LT		 309 scrollback_delta += lines;
310 schedule_console_callback();
311}
312
313void schedule_console_callback(void)
314{
315 schedule_work(&console_work);
316}
317
d8ae7242
NP		 318/*
319 * Code to manage unicode-based screen buffers
320 */
321
d8ae7242
NP		 322/*
323 * Our screen buffer is preceded by an array of line pointers so that
324 * scrolling only implies some pointer shuffling.
325 */
d8ae7242 326
feb36abb 327static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
d8ae7242 328{
feb36abb 329 u32 **uni_lines;
d8ae7242 330 void *p;
feb36abb 331 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
d8ae7242
NP		 332
333 /* allocate everything in one go */
4ba77bfb 334 memsize = col_size * rows;
feb36abb
JSS		 335 memsize += rows * sizeof(*uni_lines);
336 uni_lines = vzalloc(memsize);
337 if (!uni_lines)
d8ae7242
NP		 338 return NULL;
339
340 /* initial line pointers */
feb36abb 341 p = uni_lines + rows;
d8ae7242 342 for (i = 0; i < rows; i++) {
feb36abb 343 uni_lines[i] = p;
4ba77bfb 344 p += col_size;
d8ae7242 345 }
feb36abb
JSS		 346
347 return uni_lines;
d8ae7242
NP		 348}
349
feb36abb 350static void vc_uniscr_free(u32 **uni_lines)
57d38f26 351{
feb36abb 352 vfree(uni_lines);
57d38f26
NP		 353}
354
feb36abb 355static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
d8ae7242 356{
feb36abb
JSS		 357 vc_uniscr_free(vc->vc_uni_lines);
358 vc->vc_uni_lines = new_uni_lines;
d8ae7242
NP		 359}
360
0c8414a6 361static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
d8ae7242 362{
287696d5
JSS		 363 if (vc->vc_uni_lines)
364 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
d8ae7242
NP		 365}
366
367static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
368{
287696d5
JSS		 369 if (vc->vc_uni_lines) {
370 u32 *ln = vc->vc_uni_lines[vc->state.y];
28bc24fc 371 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 372
373 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
374 memset32(&ln[x], ' ', nr);
375 }
376}
377
378static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
379{
287696d5
JSS		 380 if (vc->vc_uni_lines) {
381 u32 *ln = vc->vc_uni_lines[vc->state.y];
28bc24fc 382 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 383
384 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
385 memset32(&ln[cols - nr], ' ', nr);
386 }
387}
388
389static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
390 unsigned int nr)
391{
287696d5
JSS		 392 if (vc->vc_uni_lines)
393 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
d8ae7242
NP		 394}
395
396static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
397 unsigned int nr)
398{
287696d5 399 if (vc->vc_uni_lines)
d8ae7242 400 while (nr--)
287696d5 401 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
d8ae7242
NP		 402}
403
8aad24ad
JSS		 404/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
405static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
406{
407 unsigned int gcd_idx;
408
409 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
410 u32 *gcd_idx_val = array[gcd_idx];
411 unsigned int dst_idx = gcd_idx;
412
413 while (1) {
414 unsigned int src_idx = (dst_idx + nr) % size;
415 if (src_idx == gcd_idx)
416 break;
417
418 array[dst_idx] = array[src_idx];
419 dst_idx = src_idx;
420 }
421
422 array[dst_idx] = gcd_idx_val;
423 }
424}
425
424c82af
JSS		 426static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
427 unsigned int bottom, enum con_scroll dir,
428 unsigned int nr)
d8ae7242 429{
feb36abb 430 u32 **uni_lines = vc->vc_uni_lines;
424c82af 431 unsigned int size = bottom - top;
d8ae7242 432
287696d5
JSS		 433 if (!uni_lines)
434 return;
d541ae4e 435
287696d5 436 if (dir == SM_DOWN) {
8aad24ad 437 juggle_array(&uni_lines[top], size, size - nr);
424c82af 438 vc_uniscr_clear_lines(vc, top, nr);
8aad24ad
JSS		 439 } else {
440 juggle_array(&uni_lines[top], size, nr);
424c82af 441 vc_uniscr_clear_lines(vc, bottom - nr, nr);
287696d5 442 }
d8ae7242
NP		 443}
444
feb36abb 445static void vc_uniscr_copy_area(u32 **dst_lines,
d8ae7242
NP		 446 unsigned int dst_cols,
447 unsigned int dst_rows,
feb36abb 448 u32 **src_lines,
d8ae7242
NP		 449 unsigned int src_cols,
450 unsigned int src_top_row,
451 unsigned int src_bot_row)
452{
453 unsigned int dst_row = 0;
454
feb36abb 455 if (!dst_lines)
d8ae7242
NP		 456 return;
457
458 while (src_top_row < src_bot_row) {
feb36abb
JSS		 459 u32 *src_line = src_lines[src_top_row];
460 u32 *dst_line = dst_lines[dst_row];
d8ae7242 461
4ba77bfb 462 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
d8ae7242
NP		 463 if (dst_cols - src_cols)
464 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
465 src_top_row++;
466 dst_row++;
467 }
468 while (dst_row < dst_rows) {
feb36abb 469 u32 *dst_line = dst_lines[dst_row];
d8ae7242
NP		 470
471 memset32(dst_line, ' ', dst_cols);
472 dst_row++;
473 }
474}
475
d21b0be2
NP		 476/*
477 * Called from vcs_read() to make sure unicode screen retrieval is possible.
478 * This will initialize the unicode screen buffer if not already done.
479 * This returns 0 if OK, or a negative error code otherwise.
480 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
481 */
482int vc_uniscr_check(struct vc_data *vc)
483{
feb36abb 484 u32 **uni_lines;
d21b0be2
NP		 485 unsigned short *p;
486 int x, y, mask;
487
d21b0be2
NP		 488 WARN_CONSOLE_UNLOCKED();
489
490 if (!vc->vc_utf)
491 return -ENODATA;
492
feb36abb 493 if (vc->vc_uni_lines)
d21b0be2
NP		 494 return 0;
495
feb36abb
JSS		 496 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
497 if (!uni_lines)
d21b0be2
NP		 498 return -ENOMEM;
499
500 /*
501 * Let's populate it initially with (imperfect) reverse translation.
502 * This is the next best thing we can do short of having it enabled
503 * from the start even when no users rely on this functionality. True
504 * unicode content will be available after a complete screen refresh.
505 */
506 p = (unsigned short *)vc->vc_origin;
507 mask = vc->vc_hi_font_mask | 0xff;
508 for (y = 0; y < vc->vc_rows; y++) {
feb36abb 509 u32 *line = uni_lines[y];
d21b0be2
NP		 510 for (x = 0; x < vc->vc_cols; x++) {
511 u16 glyph = scr_readw(p++) & mask;
512 line[x] = inverse_translate(vc, glyph, true);
513 }
514 }
515
feb36abb
JSS		 516 vc->vc_uni_lines = uni_lines;
517
d21b0be2
NP		 518 return 0;
519}
520
521/*
522 * Called from vcs_read() to get the unicode data from the screen.
523 * This must be preceded by a successful call to vc_uniscr_check() once
524 * the console lock has been taken.
525 */
b8209f69 526void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
d21b0be2
NP		 527 unsigned int row, unsigned int col, unsigned int nr)
528{
feb36abb 529 u32 **uni_lines = vc->vc_uni_lines;
708d0bff
NP		 530 int offset = row * vc->vc_size_row + col * 2;
531 unsigned long pos;
d21b0be2 532
441c9381
JSS		 533 if (WARN_ON_ONCE(!uni_lines))
534 return;
708d0bff
NP		 535
536 pos = (unsigned long)screenpos(vc, offset, viewed);
537 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
538 /*
539 * Desired position falls in the main screen buffer.
540 * However the actual row/col might be different if
541 * scrollback is active.
542 */
543 row = (pos - vc->vc_origin) / vc->vc_size_row;
544 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
feb36abb 545 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
708d0bff
NP		 546 } else {
547 /*
548 * Scrollback is active. For now let's simply backtranslate
549 * the screen glyphs until the unicode screen buffer does
550 * synchronize with console display drivers for a scrollback
551 * buffer of its own.
552 */
553 u16 *p = (u16 *)pos;
554 int mask = vc->vc_hi_font_mask | 0xff;
0c8414a6 555 u32 *uni_buf = dest;
708d0bff
NP		 556 while (nr--) {
557 u16 glyph = scr_readw(p++) & mask;
558 *uni_buf++ = inverse_translate(vc, glyph, true);
559 }
560 }
d21b0be2
NP		 561}
562
424c82af
JSS		 563static void con_scroll(struct vc_data *vc, unsigned int top,
564 unsigned int bottom, enum con_scroll dir,
565 unsigned int nr)
1da177e4 566{
bf8baa00 567 unsigned int rows = bottom - top;
424c82af 568 u16 *clear, *dst, *src;
1da177e4 569
424c82af 570 if (top + nr >= bottom)
bf8baa00 571 nr = rows - 1;
424c82af 572 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
1da177e4 573 return;
424c82af
JSS		 574
575 vc_uniscr_scroll(vc, top, bottom, dir, nr);
576 if (con_is_visible(vc) &&
577 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
1da177e4 578 return;
1da177e4 579
424c82af
JSS		 580 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
581 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
1da177e4 582
89765b94 583 if (dir == SM_UP) {
bf8baa00 584 clear = src + (rows - nr) * vc->vc_cols;
424c82af 585 swap(src, dst);
89765b94 586 }
bf8baa00 587 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
89765b94 588 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
1da177e4
LT		 589}
590
591static void do_update_region(struct vc_data *vc, unsigned long start, int count)
592{
1da177e4
LT		 593 unsigned int xx, yy, offset;
594 u16 *p;
595
596 p = (u16 *) start;
597 if (!vc->vc_sw->con_getxy) {
598 offset = (start - vc->vc_origin) / 2;
599 xx = offset % vc->vc_cols;
600 yy = offset / vc->vc_cols;
601 } else {
602 int nxx, nyy;
603 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
604 xx = nxx; yy = nyy;
605 }
606 for(;;) {
607 u16 attrib = scr_readw(p) & 0xff00;
608 int startx = xx;
609 u16 *q = p;
610 while (xx < vc->vc_cols && count) {
611 if (attrib != (scr_readw(p) & 0xff00)) {
612 if (p > q)
613 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
614 startx = xx;
615 q = p;
616 attrib = scr_readw(p) & 0xff00;
617 }
618 p++;
619 xx++;
620 count--;
621 }
622 if (p > q)
623 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
624 if (!count)
625 break;
626 xx = 0;
627 yy++;
628 if (vc->vc_sw->con_getxy) {
629 p = (u16 *)start;
630 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
631 }
632 }
1da177e4
LT		 633}
634
635void update_region(struct vc_data *vc, unsigned long start, int count)
636{
637 WARN_CONSOLE_UNLOCKED();
638
6ca8dfd7 639 if (con_should_update(vc)) {
1da177e4
LT		 640 hide_cursor(vc);
641 do_update_region(vc, start, count);
642 set_cursor(vc);
643 }
644}
921234d7 645EXPORT_SYMBOL(update_region);
1da177e4
LT		 646
647/* Structure of attributes is hardware-dependent */
648
b84ae3dc 649static u8 build_attr(struct vc_data *vc, u8 _color,
77bc14f2
JS		 650 enum vc_intensity _intensity, bool _blink, bool _underline,
651 bool _reverse, bool _italic)
1da177e4
LT		 652{
653 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 654 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
655 _blink, _underline, _reverse, _italic);
1da177e4 656
1da177e4
LT		 657/*
658 * ++roman: I completely changed the attribute format for monochrome
659 * mode (!can_do_color). The formerly used MDA (monochrome display
660 * adapter) format didn't allow the combination of certain effects.
661 * Now the attribute is just a bit vector:
662 * Bit 0..1: intensity (0..2)
663 * Bit 2 : underline
664 * Bit 3 : reverse
665 * Bit 7 : blink
666 */
667 {
c9e587ab 668 u8 a = _color;
1da177e4
LT		 669 if (!vc->vc_can_do_color)
670 return _intensity |
c5c717e7
JS		 671 (_italic << 1) |
672 (_underline << 2) |
673 (_reverse << 3) |
674 (_blink << 7);
fa6ce9ab
JE		 675 if (_italic)
676 a = (a & 0xF0) | vc->vc_itcolor;
677 else if (_underline)
1da177e4 678 a = (a & 0xf0) | vc->vc_ulcolor;
b84ae3dc 679 else if (_intensity == VCI_HALF_BRIGHT)
1c65a879 680 a = (a & 0xf0) | vc->vc_halfcolor;
1da177e4 681 if (_reverse)
faace51b 682 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
1da177e4
LT		 683 if (_blink)
684 a ^= 0x80;
b84ae3dc 685 if (_intensity == VCI_BOLD)
1da177e4
LT		 686 a ^= 0x08;
687 if (vc->vc_hi_font_mask == 0x100)
688 a <<= 1;
689 return a;
690 }
1da177e4
LT		 691}
692
693static void update_attr(struct vc_data *vc)
694{
28bc24fc
JS		 695 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
696 vc->state.blink, vc->state.underline,
697 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
b84ae3dc 698 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
77bc14f2
JS		 699 VCI_NORMAL, vc->state.blink, false,
700 vc->vc_decscnm, false) << 8);
1da177e4
LT		 701}
702
703/* Note: inverting the screen twice should revert to the original state */
b8209f69 704void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
1da177e4
LT		 705{
706 unsigned short *p;
707
708 WARN_CONSOLE_UNLOCKED();
709
710 count /= 2;
711 p = screenpos(vc, offset, viewed);
6af39ed3 712 if (vc->vc_sw->con_invert_region) {
1da177e4 713 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 714 } else {
1da177e4
LT		 715 u16 *q = p;
716 int cnt = count;
717 u16 a;
718
719 if (!vc->vc_can_do_color) {
720 while (cnt--) {
721 a = scr_readw(q);
722 a ^= 0x0800;
723 scr_writew(a, q);
724 q++;
725 }
726 } else if (vc->vc_hi_font_mask == 0x100) {
727 while (cnt--) {
728 a = scr_readw(q);
faace51b
JS		 729 a = (a & 0x11ff) |
730 ((a & 0xe000) >> 4) |
731 ((a & 0x0e00) << 4);
1da177e4
LT		 732 scr_writew(a, q);
733 q++;
734 }
735 } else {
736 while (cnt--) {
737 a = scr_readw(q);
faace51b
JS		 738 a = (a & 0x88ff) |
739 ((a & 0x7000) >> 4) |
740 ((a & 0x0700) << 4);
1da177e4
LT		 741 scr_writew(a, q);
742 q++;
743 }
744 }
745 }
6af39ed3 746
6ca8dfd7 747 if (con_should_update(vc))
1da177e4 748 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 749 notify_update(vc);
1da177e4
LT		 750}
751
752/* used by selection: complement pointer position */
753void complement_pos(struct vc_data *vc, int offset)
754{
414edcd3 755 static int old_offset = -1;
1da177e4
LT		 756 static unsigned short old;
757 static unsigned short oldx, oldy;
758
759 WARN_CONSOLE_UNLOCKED();
760
414edcd3
AD		 761 if (old_offset != -1 && old_offset >= 0 &&
762 old_offset < vc->vc_screenbuf_size) {
b8209f69 763 scr_writew(old, screenpos(vc, old_offset, true));
6ca8dfd7 764 if (con_should_update(vc))
1da177e4 765 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 766 notify_update(vc);
1da177e4 767 }
414edcd3
AD		 768
769 old_offset = offset;
770
771 if (offset != -1 && offset >= 0 &&
772 offset < vc->vc_screenbuf_size) {
1da177e4 773 unsigned short new;
414edcd3 774 unsigned short *p;
b8209f69 775 p = screenpos(vc, offset, true);
1da177e4
LT		 776 old = scr_readw(p);
777 new = old ^ vc->vc_complement_mask;
778 scr_writew(new, p);
6ca8dfd7 779 if (con_should_update(vc)) {
1da177e4
LT		 780 oldx = (offset >> 1) % vc->vc_cols;
781 oldy = (offset >> 1) / vc->vc_cols;
782 vc->vc_sw->con_putc(vc, new, oldy, oldx);
783 }
19e3ae6b 784 notify_update(vc);
1da177e4
LT		 785 }
786}
787
788static void insert_char(struct vc_data *vc, unsigned int nr)
789{
81732c3b 790 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 791
d8ae7242 792 vc_uniscr_insert(vc, nr);
28bc24fc 793 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
81732c3b 794 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 795 vc->vc_need_wrap = 0;
6ca8dfd7 796 if (con_should_update(vc))
81732c3b 797 do_update_region(vc, (unsigned long) p,
28bc24fc 798 vc->vc_cols - vc->state.x);
1da177e4
LT		 799}
800
801static void delete_char(struct vc_data *vc, unsigned int nr)
802{
81732c3b 803 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 804
d8ae7242 805 vc_uniscr_delete(vc, nr);
39cdb68c 806 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
28bc24fc 807 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
81732c3b 808 nr * 2);
1da177e4 809 vc->vc_need_wrap = 0;
6ca8dfd7 810 if (con_should_update(vc))
81732c3b 811 do_update_region(vc, (unsigned long) p,
28bc24fc 812 vc->vc_cols - vc->state.x);
1da177e4
LT		 813}
814
e882f715 815static int softcursor_original = -1;
1da177e4
LT		 816
817static void add_softcursor(struct vc_data *vc)
818{
819 int i = scr_readw((u16 *) vc->vc_pos);
820 u32 type = vc->vc_cursor_type;
821
c0e4b3ad 822 if (!(type & CUR_SW))
dc219db6
JS		 823 return;
824 if (softcursor_original != -1)
825 return;
1da177e4 826 softcursor_original = i;
c0e4b3ad
JS		 827 i |= CUR_SET(type);
828 i ^= CUR_CHANGE(type);
829 if ((type & CUR_ALWAYS_BG) &&
830 (softcursor_original & CUR_BG) == (i & CUR_BG))
831 i ^= CUR_BG;
832 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
833 i ^= CUR_FG;
dc219db6 834 scr_writew(i, (u16 *)vc->vc_pos);
6ca8dfd7 835 if (con_should_update(vc))
28bc24fc 836 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
1da177e4
LT		 837}
838
839static void hide_softcursor(struct vc_data *vc)
840{
841 if (softcursor_original != -1) {
842 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 843 if (con_should_update(vc))
1da177e4 844 vc->vc_sw->con_putc(vc, softcursor_original,
28bc24fc 845 vc->state.y, vc->state.x);
1da177e4
LT		 846 softcursor_original = -1;
847 }
848}
849
850static void hide_cursor(struct vc_data *vc)
851{
dce05aa6 852 if (vc_is_sel(vc))
1da177e4 853 clear_selection();
dce05aa6 854
1da177e4
LT		 855 vc->vc_sw->con_cursor(vc, CM_ERASE);
856 hide_softcursor(vc);
857}
858
859static void set_cursor(struct vc_data *vc)
860{
6ca8dfd7 861 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 862 return;
863 if (vc->vc_deccm) {
dce05aa6 864 if (vc_is_sel(vc))
1da177e4
LT		 865 clear_selection();
866 add_softcursor(vc);
c0e4b3ad 867 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
1da177e4
LT		 868 vc->vc_sw->con_cursor(vc, CM_DRAW);
869 } else
870 hide_cursor(vc);
871}
872
873static void set_origin(struct vc_data *vc)
874{
875 WARN_CONSOLE_UNLOCKED();
876
6ca8dfd7 877 if (!con_is_visible(vc) ||
1da177e4
LT		 878 !vc->vc_sw->con_set_origin ||
879 !vc->vc_sw->con_set_origin(vc))
880 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
881 vc->vc_visible_origin = vc->vc_origin;
882 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
28bc24fc
JS		 883 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
884 2 * vc->state.x;
1da177e4
LT		 885}
886
c0f160a7 887static void save_screen(struct vc_data *vc)
1da177e4
LT		 888{
889 WARN_CONSOLE_UNLOCKED();
890
891 if (vc->vc_sw->con_save_screen)
892 vc->vc_sw->con_save_screen(vc);
893}
894
bcd375f7
MS		 895static void flush_scrollback(struct vc_data *vc)
896{
897 WARN_CONSOLE_UNLOCKED();
898
a6dbe442 899 set_origin(vc);
3f4ef485 900 if (vc->vc_sw->con_flush_scrollback) {
bcd375f7 901 vc->vc_sw->con_flush_scrollback(vc);
3f4ef485
NP		 902 } else if (con_is_visible(vc)) {
903 /*
904 * When no con_flush_scrollback method is provided then the
905 * legacy way for flushing the scrollback buffer is to use
906 * a side effect of the con_switch method. We do it only on
907 * the foreground console as background consoles have no
908 * scrollback buffers in that case and we obviously don't
909 * want to switch to them.
910 */
911 hide_cursor(vc);
a6dbe442 912 vc->vc_sw->con_switch(vc);
3f4ef485
NP		 913 set_cursor(vc);
914 }
bcd375f7
MS		 915}
916
1da177e4
LT		 917/*
918 * Redrawing of screen
919 */
920
2a248307 921void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 922{
923 unsigned short *p = (unsigned short *)vc->vc_origin;
924 int count = vc->vc_screenbuf_size / 2;
925 int mask = vc->vc_hi_font_mask | 0xff;
926
927 for (; count > 0; count--, p++) {
928 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
929 }
930}
931
932void redraw_screen(struct vc_data *vc, int is_switch)
933{
934 int redraw = 0;
935
936 WARN_CONSOLE_UNLOCKED();
937
938 if (!vc) {
939 /* strange ... */
940 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
941 return;
942 }
943
944 if (is_switch) {
945 struct vc_data *old_vc = vc_cons[fg_console].d;
946 if (old_vc == vc)
947 return;
6ca8dfd7 948 if (!con_is_visible(vc))
1da177e4
LT		 949 redraw = 1;
950 *vc->vc_display_fg = vc;
951 fg_console = vc->vc_num;
952 hide_cursor(old_vc);
6ca8dfd7 953 if (!con_is_visible(old_vc)) {
1da177e4
LT		 954 save_screen(old_vc);
955 set_origin(old_vc);
956 }
fbc92a34
KS		 957 if (tty0dev)
958 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 959 } else {
960 hide_cursor(vc);
961 redraw = 1;
962 }
963
964 if (redraw) {
965 int update;
966 int old_was_color = vc->vc_can_do_color;
967
968 set_origin(vc);
969 update = vc->vc_sw->con_switch(vc);
970 set_palette(vc);
971 /*
972 * If console changed from mono<->color, the best we can do
973 * is to clear the buffer attributes. As it currently stands,
974 * rebuilding new attributes from the old buffer is not doable
975 * without overly complex code.
976 */
977 if (old_was_color != vc->vc_can_do_color) {
978 update_attr(vc);
979 clear_buffer_attributes(vc);
980 }
8fd4bd22 981
8d7fc299 982 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 983 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
984 }
985 set_cursor(vc);
986 if (is_switch) {
63f24a7f 987 vt_set_leds_compute_shiftstate();
8182ec49 988 notify_update(vc);
1da177e4
LT		 989 }
990}
921234d7 991EXPORT_SYMBOL(redraw_screen);
1da177e4
LT		 992
993/*
994 * Allocation, freeing and resizing of VTs.
995 */
996
997int vc_cons_allocated(unsigned int i)
998{
999 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1000}
1001
1002static void visual_init(struct vc_data *vc, int num, int init)
1003{
1004 /* ++Geert: vc->vc_sw->con_init determines console size */
1005 if (vc->vc_sw)
1006 module_put(vc->vc_sw->owner);
1007 vc->vc_sw = conswitchp;
f91cf1a3 1008
1da177e4
LT		 1009 if (con_driver_map[num])
1010 vc->vc_sw = con_driver_map[num];
f91cf1a3 1011
1da177e4
LT		 1012 __module_get(vc->vc_sw->owner);
1013 vc->vc_num = num;
1014 vc->vc_display_fg = &master_display_fg;
8da443b1 1015 if (vc->uni_pagedict_loc)
08b33249 1016 con_free_unimap(vc);
8da443b1
JS		 1017 vc->uni_pagedict_loc = &vc->uni_pagedict;
1018 vc->uni_pagedict = NULL;
1da177e4
LT		 1019 vc->vc_hi_font_mask = 0;
1020 vc->vc_complement_mask = 0;
1021 vc->vc_can_do_color = 0;
1b45996d 1022 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1023 vc->vc_sw->con_init(vc, init);
1024 if (!vc->vc_complement_mask)
1025 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1026 vc->vc_s_complement_mask = vc->vc_complement_mask;
1027 vc->vc_size_row = vc->vc_cols << 1;
1028 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1029}
1030
a1ad1cc9
GH		 1031
1032static void visual_deinit(struct vc_data *vc)
1033{
1034 vc->vc_sw->con_deinit(vc);
1035 module_put(vc->vc_sw->owner);
1036}
1037
ca4463bf
EB		 1038static void vc_port_destruct(struct tty_port *port)
1039{
1040 struct vc_data *vc = container_of(port, struct vc_data, port);
1041
1042 kfree(vc);
1043}
1044
1045static const struct tty_port_operations vc_port_ops = {
1046 .destruct = vc_port_destruct,
1047};
1048
ce684552
TH		 1049/*
1050 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1051 * [this is to be used together with some user program
1052 * like resize that changes the hardware videomode]
1053 */
1054#define VC_MAXCOL (32767)
1055#define VC_MAXROW (32767)
1056
1da177e4
LT		 1057int vc_allocate(unsigned int currcons) /* return 0 on success */
1058{
34902b7f
JS		 1059 struct vt_notifier_param param;
1060 struct vc_data *vc;
ce684552 1061 int err;
34902b7f 1062
1da177e4
LT		 1063 WARN_CONSOLE_UNLOCKED();
1064
1065 if (currcons >= MAX_NR_CONSOLES)
1066 return -ENXIO;
34902b7f
JS		 1067
1068 if (vc_cons[currcons].d)
1069 return 0;
1070
1071 /* due to the granularity of kmalloc, we waste some memory here */
1072 /* the alloc is done in two steps, to optimize the common situation
1073 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1074 /* although the numbers above are not valid since long ago, the
1075 point is still up-to-date and the comment still has its value
1076 even if only as a historical artifact. --mj, July 1998 */
1077 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1078 if (!vc)
1da177e4 1079 return -ENOMEM;
34902b7f
JS		 1080
1081 vc_cons[currcons].d = vc;
1082 tty_port_init(&vc->port);
ca4463bf 1083 vc->port.ops = &vc_port_ops;
34902b7f
JS		 1084 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1085
1086 visual_init(vc, currcons, 1);
1087
8da443b1 1088 if (!*vc->uni_pagedict_loc)
1da177e4 1089 con_set_default_unimap(vc);
f6c06b68 1090
ce684552
TH		 1091 err = -EINVAL;
1092 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1093 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1094 goto err_free;
1095 err = -ENOMEM;
21eff69a 1096 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1097 if (!vc->vc_screenbuf)
1098 goto err_free;
1099
1100 /* If no drivers have overridden us and the user didn't pass a
1101 boot option, default to displaying the cursor */
1102 if (global_cursor_default == -1)
1103 global_cursor_default = 1;
1104
f68279ca 1105 vc_init(vc, 1);
34902b7f
JS		 1106 vcs_make_sysfs(currcons);
1107 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1108
1da177e4 1109 return 0;
34902b7f 1110err_free:
a1ad1cc9 1111 visual_deinit(vc);
34902b7f
JS		 1112 kfree(vc);
1113 vc_cons[currcons].d = NULL;
ce684552 1114 return err;
1da177e4
LT		 1115}
1116
e400b6ec
AD		 1117static inline int resize_screen(struct vc_data *vc, int width, int height,
1118 int user)
1da177e4
LT		 1119{
1120 /* Resizes the resolution of the display adapater */
1121 int err = 0;
1122
ffb324e6 1123 if (vc->vc_sw->con_resize)
e400b6ec
AD		 1124 err = vc->vc_sw->con_resize(vc, width, height, user);
1125
1da177e4
LT		 1126 return err;
1127}
1128
8c9a9dd0
AC		 1129/**
1130 * vc_do_resize - resizing method for the tty
1131 * @tty: tty being resized
8c9a9dd0
AC		 1132 * @vc: virtual console private data
1133 * @cols: columns
1134 * @lines: lines
1135 *
1136 * Resize a virtual console, clipping according to the actual constraints.
1137 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1138 * information and perform any necessary signal handling.
8c9a9dd0 1139 *
6a1c0680 1140 * Caller must hold the console semaphore. Takes the termios rwsem and
64d608db 1141 * ctrl.lock of the tty IFF a tty is passed.
8c9a9dd0
AC		 1142 */
1143
fc6f6238
AC		 1144static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1145 unsigned int cols, unsigned int lines)
1da177e4
LT		 1146{
1147 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1148 unsigned long end;
d8ae7242 1149 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1150 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1151 unsigned int user;
f8d1653d 1152 unsigned short *oldscreen, *newscreen;
feb36abb 1153 u32 **new_uniscr = NULL;
1da177e4
LT		 1154
1155 WARN_CONSOLE_UNLOCKED();
1156
1157 if (!vc)
1158 return -ENXIO;
1159
e400b6ec
AD		 1160 user = vc->vc_resize_user;
1161 vc->vc_resize_user = 0;
1162
ce684552 1163 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1da177e4
LT		 1164 return -EINVAL;
1165
1166 new_cols = (cols ? cols : vc->vc_cols);
1167 new_rows = (lines ? lines : vc->vc_rows);
1168 new_row_size = new_cols << 1;
1169 new_screen_size = new_row_size * new_rows;
1170
3b0c4061
IMAT		 1171 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1172 /*
1173 * This function is being called here to cover the case
1174 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1175 * passing the same fb_var_screeninfo containing the fields
1176 * yres/xres equal to a number non-multiple of vc_font.height
1177 * and yres_virtual/xres_virtual equal to number lesser than the
1178 * vc_font.height and yres/xres.
1179 * In the second call, the struct fb_var_screeninfo isn't
1180 * being modified by the underlying driver because of the
1181 * if above, and this causes the fbcon_display->vrows to become
1182 * negative and it eventually leads to out-of-bound
1183 * access by the imageblit function.
1184 * To give the correct values to the struct and to not have
1185 * to deal with possible errors from the code below, we call
1186 * the resize_screen here as well.
1187 */
1188 return resize_screen(vc, new_cols, new_rows, user);
1189 }
1da177e4 1190
ce684552 1191 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
32b2921e 1192 return -EINVAL;
21eff69a 1193 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1194 if (!newscreen)
1195 return -ENOMEM;
1196
feb36abb 1197 if (vc->vc_uni_lines) {
d8ae7242
NP		 1198 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1199 if (!new_uniscr) {
1200 kfree(newscreen);
1201 return -ENOMEM;
1202 }
1203 }
1204
dce05aa6 1205 if (vc_is_sel(vc))
009e39ae
SD		 1206 clear_selection();
1207
1da177e4 1208 old_rows = vc->vc_rows;
1da177e4 1209 old_row_size = vc->vc_size_row;
1da177e4 1210
e400b6ec 1211 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1212 if (err) {
1213 kfree(newscreen);
57d38f26 1214 vc_uniscr_free(new_uniscr);
1da177e4
LT		 1215 return err;
1216 }
1217
1218 vc->vc_rows = new_rows;
1219 vc->vc_cols = new_cols;
1220 vc->vc_size_row = new_row_size;
1221 vc->vc_screenbuf_size = new_screen_size;
1222
1223 rlth = min(old_row_size, new_row_size);
1224 rrem = new_row_size - rlth;
1225 old_origin = vc->vc_origin;
1226 new_origin = (long) newscreen;
1227 new_scr_end = new_origin + new_screen_size;
3b41dc1a 1228
28bc24fc
JS		 1229 if (vc->state.y > new_rows) {
1230 if (old_rows - vc->state.y < new_rows) {
3b41dc1a
AD		 1231 /*
1232 * Cursor near the bottom, copy contents from the
1233 * bottom of buffer
1234 */
d8ae7242 1235 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1236 } else {
1237 /*
1238 * Cursor is in no man's land, copy 1/2 screenful
1239 * from the top and bottom of cursor position
1240 */
28bc24fc 1241 first_copied_row = (vc->state.y - new_rows/2);
3b41dc1a 1242 }
d8ae7242
NP		 1243 old_origin += first_copied_row * old_row_size;
1244 } else
1245 first_copied_row = 0;
9fc2b2d0 1246 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1247
d8ae7242 1248 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
feb36abb 1249 vc->vc_uni_lines, rlth/2, first_copied_row,
d8ae7242
NP		 1250 min(old_rows, new_rows));
1251 vc_uniscr_set(vc, new_uniscr);
1252
1da177e4
LT		 1253 update_attr(vc);
1254
3b41dc1a
AD		 1255 while (old_origin < end) {
1256 scr_memcpyw((unsigned short *) new_origin,
1257 (unsigned short *) old_origin, rlth);
1da177e4 1258 if (rrem)
3b41dc1a
AD		 1259 scr_memsetw((void *)(new_origin + rlth),
1260 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1261 old_origin += old_row_size;
1262 new_origin += new_row_size;
1263 }
1264 if (new_scr_end > new_origin)
3b41dc1a
AD		 1265 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1266 new_scr_end - new_origin);
f8d1653d 1267 oldscreen = vc->vc_screenbuf;
1da177e4 1268 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1269 vc->vc_screenbuf_size = new_screen_size;
1270 set_origin(vc);
f8d1653d 1271 kfree(oldscreen);
1da177e4
LT		 1272
1273 /* do part of a reset_terminal() */
1274 vc->vc_top = 0;
1275 vc->vc_bottom = vc->vc_rows;
28bc24fc 1276 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 1277 save_cur(vc);
1278
8c9a9dd0
AC		 1279 if (tty) {
1280 /* Rewrite the requested winsize data with the actual
1281 resulting sizes */
1282 struct winsize ws;
1da177e4
LT		 1283 memset(&ws, 0, sizeof(ws));
1284 ws.ws_row = vc->vc_rows;
1285 ws.ws_col = vc->vc_cols;
1286 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1287 tty_do_resize(tty, &ws);
1da177e4
LT		 1288 }
1289
6ca8dfd7 1290 if (con_is_visible(vc))
1da177e4 1291 update_screen(vc);
8b92e87d 1292 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1293 notify_update(vc);
1da177e4
LT		 1294 return err;
1295}
1296
8c9a9dd0
AC		 1297/**
1298 * vc_resize - resize a VT
1299 * @vc: virtual console
1300 * @cols: columns
1301 * @rows: rows
1302 *
1303 * Resize a virtual console as seen from the console end of things. We
1304 * use the common vc_do_resize methods to update the structures. The
1305 * caller must hold the console sem to protect console internals and
8ce73264 1306 * vc->port.tty
8c9a9dd0
AC		 1307 */
1308
1309int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1310{
8ce73264 1311 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0 1312}
921234d7 1313EXPORT_SYMBOL(vc_resize);
8c9a9dd0
AC		 1314
1315/**
1316 * vt_resize - resize a VT
1317 * @tty: tty to resize
8c9a9dd0
AC		 1318 * @ws: winsize attributes
1319 *
1320 * Resize a virtual terminal. This is called by the tty layer as we
1321 * register our own handler for resizing. The mutual helper does all
1322 * the actual work.
1323 *
1324 * Takes the console sem and the called methods then take the tty
64d608db 1325 * termios_rwsem and the tty ctrl.lock in that order.
8c9a9dd0 1326 */
da2bdf9a 1327static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1328{
8c9a9dd0
AC		 1329 struct vc_data *vc = tty->driver_data;
1330 int ret;
ca9bda00 1331
ac751efa 1332 console_lock();
fc6f6238 1333 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1334 console_unlock();
8c9a9dd0 1335 return ret;
ca9bda00 1336}
1da177e4 1337
421b40a6 1338struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1339{
421b40a6
PH		 1340 struct vc_data *vc = NULL;
1341
1da177e4
LT		 1342 WARN_CONSOLE_UNLOCKED();
1343
1344 if (vc_cons_allocated(currcons)) {
421b40a6 1345 struct vt_notifier_param param;
4995f8ef 1346
421b40a6 1347 param.vc = vc = vc_cons[currcons].d;
b293d758 1348 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1349 vcs_remove_sysfs(currcons);
a1ad1cc9 1350 visual_deinit(vc);
211b4d42 1351 con_free_unimap(vc);
bde0d2c9 1352 put_pid(vc->vt_pid);
d8ae7242 1353 vc_uniscr_set(vc, NULL);
5c9228f0 1354 kfree(vc->vc_screenbuf);
1da177e4
LT		 1355 vc_cons[currcons].d = NULL;
1356 }
421b40a6 1357 return vc;
1da177e4
LT		 1358}
1359
1360/*
1361 * VT102 emulator
1362 */
1363
2ff5c5a1
MH		 1364enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1365
079c9534
AC		 1366#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1367#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1368#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1369
1370#define decarm VC_REPEAT
1371#define decckm VC_CKMODE
1372#define kbdapplic VC_APPLIC
1373#define lnm VC_CRLF
1374
8ede5cce 1375const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4 1376 8,12,10,14, 9,13,11,15 };
921234d7 1377EXPORT_SYMBOL(color_table);
1da177e4
LT		 1378
1379/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1380unsigned char default_red[] = {
1381 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1382 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1383};
1384module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
921234d7 1385EXPORT_SYMBOL(default_red);
91e74ca5
JS		 1386
1387unsigned char default_grn[] = {
1388 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1389 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1390};
1391module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
921234d7 1392EXPORT_SYMBOL(default_grn);
91e74ca5
JS		 1393
1394unsigned char default_blu[] = {
1395 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1396 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1397};
1398module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
921234d7 1399EXPORT_SYMBOL(default_blu);
1c2bbe6a 1400
1da177e4
LT		 1401/*
1402 * gotoxy() must verify all boundaries, because the arguments
1403 * might also be negative. If the given position is out of
1404 * bounds, the cursor is placed at the nearest margin.
1405 */
1406static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1407{
1408 int min_y, max_y;
1409
1410 if (new_x < 0)
28bc24fc 1411 vc->state.x = 0;
1da177e4
LT		 1412 else {
1413 if (new_x >= vc->vc_cols)
28bc24fc 1414 vc->state.x = vc->vc_cols - 1;
1da177e4 1415 else
28bc24fc 1416 vc->state.x = new_x;
1da177e4
LT		 1417 }
1418
1419 if (vc->vc_decom) {
1420 min_y = vc->vc_top;
1421 max_y = vc->vc_bottom;
1422 } else {
1423 min_y = 0;
1424 max_y = vc->vc_rows;
1425 }
1426 if (new_y < min_y)
28bc24fc 1427 vc->state.y = min_y;
1da177e4 1428 else if (new_y >= max_y)
28bc24fc 1429 vc->state.y = max_y - 1;
1da177e4 1430 else
28bc24fc
JS		 1431 vc->state.y = new_y;
1432 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1433 (vc->state.x << 1);
1da177e4
LT		 1434 vc->vc_need_wrap = 0;
1435}
1436
1437/* for absolute user moves, when decom is set */
1438static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1439{
1440 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1441}
1442
1b0ec88a 1443void scrollback(struct vc_data *vc)
1da177e4 1444{
1b0ec88a 1445 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1446}
1447
1448void scrollfront(struct vc_data *vc, int lines)
1449{
1450 if (!lines)
1451 lines = vc->vc_rows / 2;
1452 scrolldelta(lines);
1453}
1454
1455static void lf(struct vc_data *vc)
1456{
1457 /* don't scroll if above bottom of scrolling region, or
1458 * if below scrolling region
1459 */
28bc24fc 1460 if (vc->state.y + 1 == vc->vc_bottom)
89765b94 1461 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
28bc24fc
JS		 1462 else if (vc->state.y < vc->vc_rows - 1) {
1463 vc->state.y++;
1da177e4
LT		 1464 vc->vc_pos += vc->vc_size_row;
1465 }
1466 vc->vc_need_wrap = 0;
b293d758 1467 notify_write(vc, '\n');
1da177e4
LT		 1468}
1469
1470static void ri(struct vc_data *vc)
1471{
1472 /* don't scroll if below top of scrolling region, or
1473 * if above scrolling region
1474 */
28bc24fc 1475 if (vc->state.y == vc->vc_top)
89765b94 1476 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
28bc24fc
JS		 1477 else if (vc->state.y > 0) {
1478 vc->state.y--;
1da177e4
LT		 1479 vc->vc_pos -= vc->vc_size_row;
1480 }
1481 vc->vc_need_wrap = 0;
1482}
1483
1484static inline void cr(struct vc_data *vc)
1485{
28bc24fc
JS		 1486 vc->vc_pos -= vc->state.x << 1;
1487 vc->vc_need_wrap = vc->state.x = 0;
b293d758 1488 notify_write(vc, '\r');
1da177e4
LT		 1489}
1490
1491static inline void bs(struct vc_data *vc)
1492{
28bc24fc 1493 if (vc->state.x) {
1da177e4 1494 vc->vc_pos -= 2;
28bc24fc 1495 vc->state.x--;
1da177e4 1496 vc->vc_need_wrap = 0;
b293d758 1497 notify_write(vc, '\b');
1da177e4
LT		 1498 }
1499}
1500
1501static inline void del(struct vc_data *vc)
1502{
1503 /* ignored */
1504}
1505
1506static void csi_J(struct vc_data *vc, int vpar)
1507{
1508 unsigned int count;
1509 unsigned short * start;
1510
1511 switch (vpar) {
1512 case 0: /* erase from cursor to end of display */
28bc24fc
JS		 1513 vc_uniscr_clear_line(vc, vc->state.x,
1514 vc->vc_cols - vc->state.x);
1515 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1516 vc->vc_rows - vc->state.y - 1);
1da177e4
LT		 1517 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1518 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1519 break;
1520 case 1: /* erase from start to cursor */
28bc24fc
JS		 1521 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1522 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1da177e4
LT		 1523 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1524 start = (unsigned short *)vc->vc_origin;
1da177e4 1525 break;
a6dbe442
NP		 1526 case 3: /* include scrollback */
1527 flush_scrollback(vc);
df561f66 1528 fallthrough;
1da177e4 1529 case 2: /* erase whole display */
d8ae7242 1530 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1531 count = vc->vc_cols * vc->vc_rows;
1532 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1533 break;
1534 default:
1535 return;
1536 }
1537 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
b2ecf006
MP		 1538 if (con_should_update(vc))
1539 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1540 vc->vc_need_wrap = 0;
1541}
1542
1543static void csi_K(struct vc_data *vc, int vpar)
1544{
1545 unsigned int count;
d8ae7242
NP		 1546 unsigned short *start = (unsigned short *)vc->vc_pos;
1547 int offset;
1da177e4
LT		 1548
1549 switch (vpar) {
1550 case 0: /* erase from cursor to end of line */
d8ae7242 1551 offset = 0;
28bc24fc 1552 count = vc->vc_cols - vc->state.x;
1da177e4
LT		 1553 break;
1554 case 1: /* erase from start of line to cursor */
28bc24fc
JS		 1555 offset = -vc->state.x;
1556 count = vc->state.x + 1;
1da177e4
LT		 1557 break;
1558 case 2: /* erase whole line */
28bc24fc 1559 offset = -vc->state.x;
1da177e4 1560 count = vc->vc_cols;
1da177e4
LT		 1561 break;
1562 default:
1563 return;
1564 }
28bc24fc 1565 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
d8ae7242 1566 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1567 vc->vc_need_wrap = 0;
6ca8dfd7 1568 if (con_should_update(vc))
943210ba 1569 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1570}
1571
e8548296
JS		 1572/* erase the following vpar positions */
1573static void csi_X(struct vc_data *vc, unsigned int vpar)
1da177e4 1574{ /* not vt100? */
e8548296 1575 unsigned int count;
1da177e4
LT		 1576
1577 if (!vpar)
1578 vpar++;
e8548296
JS		 1579
1580 count = min(vpar, vc->vc_cols - vc->state.x);
1da177e4 1581
28bc24fc 1582 vc_uniscr_clear_line(vc, vc->state.x, count);
1da177e4 1583 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1584 if (con_should_update(vc))
28bc24fc 1585 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1da177e4
LT		 1586 vc->vc_need_wrap = 0;
1587}
1588
1589static void default_attr(struct vc_data *vc)
1590{
b84ae3dc 1591 vc->state.intensity = VCI_NORMAL;
77bc14f2
JS		 1592 vc->state.italic = false;
1593 vc->state.underline = false;
1594 vc->state.reverse = false;
1595 vc->state.blink = false;
28bc24fc 1596 vc->state.color = vc->vc_def_color;
1da177e4
LT		 1597}
1598
cec5b2a9
AB		 1599struct rgb { u8 r; u8 g; u8 b; };
1600
0f91e142 1601static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1602{
cec5b2a9 1603 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1604 c->r = i&1 ? 0xaa : 0x00;
1605 c->g = i&2 ? 0xaa : 0x00;
1606 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1607 } else if (i < 16) {
0f91e142
JS		 1608 c->r = i&1 ? 0xff : 0x55;
1609 c->g = i&2 ? 0xff : 0x55;
1610 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1611 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1612 c->r = (i - 16) / 36 * 85 / 2;
1613 c->g = (i - 16) / 6 % 6 * 85 / 2;
1614 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1615 } else /* Grayscale ramp. */
0f91e142 1616 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1617}
1618
0f91e142 1619static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1620{
193df022
JS		 1621 u8 hue = 0, max = max3(c->r, c->g, c->b);
1622
1623 if (c->r > max / 2)
1624 hue |= 4;
1625 if (c->g > max / 2)
1626 hue |= 2;
1627 if (c->b > max / 2)
1628 hue |= 1;
1629
1630 if (hue == 7 && max <= 0x55) {
1631 hue = 0;
b84ae3dc 1632 vc->state.intensity = VCI_BOLD;
193df022 1633 } else if (max > 0xaa)
b84ae3dc 1634 vc->state.intensity = VCI_BOLD;
cec5b2a9 1635 else
b84ae3dc 1636 vc->state.intensity = VCI_NORMAL;
193df022 1637
28bc24fc 1638 vc->state.color = (vc->state.color & 0xf0) | hue;
cec5b2a9
AB		 1639}
1640
0f91e142 1641static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1642{
1643 /* For backgrounds, err on the dark side. */
28bc24fc 1644 vc->state.color = (vc->state.color & 0x0f)
0f91e142 1645 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1646}
1647
e05ab238
JS		 1648/*
1649 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1650 * and thus need to be detected and ignored by hand. That standard also
1651 * wants : rather than ; as separators but sequences containing : are currently
1652 * completely ignored by the parser.
e05ab238
JS		 1653 *
1654 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1655 * supporting them.
1656 */
1657static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1658 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1659{
0f91e142
JS		 1660 struct rgb c;
1661
e05ab238
JS		 1662 i++;
1663 if (i > vc->vc_npar)
1664 return i;
1665
0bf1f4a8 1666 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1667 /* 256 colours */
e05ab238 1668 i++;
0f91e142 1669 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1670 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1671 /* 24 bit */
0f91e142
JS		 1672 c.r = vc->vc_par[i + 1];
1673 c.g = vc->vc_par[i + 2];
1674 c.b = vc->vc_par[i + 3];
e05ab238 1675 i += 3;
0f91e142
JS		 1676 } else
1677 return i;
1678
1679 set_color(vc, &c);
e05ab238
JS		 1680
1681 return i;
1682}
1683
ac751efa 1684/* console_lock is held */
1da177e4
LT		 1685static void csi_m(struct vc_data *vc)
1686{
1687 int i;
1688
1689 for (i = 0; i <= vc->vc_npar; i++)
1690 switch (vc->vc_par[i]) {
aada0a34
JS		 1691 case 0: /* all attributes off */
1692 default_attr(vc);
1693 break;
1694 case 1:
b84ae3dc 1695 vc->state.intensity = VCI_BOLD;
aada0a34
JS		 1696 break;
1697 case 2:
b84ae3dc 1698 vc->state.intensity = VCI_HALF_BRIGHT;
aada0a34
JS		 1699 break;
1700 case 3:
77bc14f2 1701 vc->state.italic = true;
aada0a34 1702 break;
65d9982d
MF		 1703 case 21:
1704 /*
1705 * No console drivers support double underline, so
1706 * convert it to a single underline.
1707 */
aada0a34 1708 case 4:
77bc14f2 1709 vc->state.underline = true;
aada0a34
JS		 1710 break;
1711 case 5:
77bc14f2 1712 vc->state.blink = true;
aada0a34
JS		 1713 break;
1714 case 7:
77bc14f2 1715 vc->state.reverse = true;
aada0a34
JS		 1716 break;
1717 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1718 * Select primary font, don't display control chars if
1719 * defined, don't set bit 8 on output.
1720 */
b70ec4d9 1721 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
aada0a34
JS		 1722 vc->vc_disp_ctrl = 0;
1723 vc->vc_toggle_meta = 0;
1724 break;
1725 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1726 * Select first alternate font, lets chars < 32 be
1727 * displayed as ROM chars.
1728 */
1729 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1730 vc->vc_disp_ctrl = 1;
1731 vc->vc_toggle_meta = 0;
1732 break;
1733 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1734 * Select second alternate font, toggle high bit
1735 * before displaying as ROM char.
1736 */
1737 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1738 vc->vc_disp_ctrl = 1;
1739 vc->vc_toggle_meta = 1;
1740 break;
aada0a34 1741 case 22:
b84ae3dc 1742 vc->state.intensity = VCI_NORMAL;
aada0a34
JS		 1743 break;
1744 case 23:
77bc14f2 1745 vc->state.italic = false;
aada0a34
JS		 1746 break;
1747 case 24:
77bc14f2 1748 vc->state.underline = false;
aada0a34
JS		 1749 break;
1750 case 25:
77bc14f2 1751 vc->state.blink = false;
aada0a34
JS		 1752 break;
1753 case 27:
77bc14f2 1754 vc->state.reverse = false;
aada0a34
JS		 1755 break;
1756 case 38:
1757 i = vc_t416_color(vc, i, rgb_foreground);
1758 break;
1759 case 48:
1760 i = vc_t416_color(vc, i, rgb_background);
1761 break;
1762 case 39:
28bc24fc
JS		 1763 vc->state.color = (vc->vc_def_color & 0x0f) |
1764 (vc->state.color & 0xf0);
aada0a34
JS		 1765 break;
1766 case 49:
28bc24fc
JS		 1767 vc->state.color = (vc->vc_def_color & 0xf0) |
1768 (vc->state.color & 0x0f);
aada0a34
JS		 1769 break;
1770 default:
fadb4244
AB		 1771 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1772 if (vc->vc_par[i] < 100)
b84ae3dc 1773 vc->state.intensity = VCI_BOLD;
cc67dc28
AB		 1774 vc->vc_par[i] -= 60;
1775 }
aada0a34 1776 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
28bc24fc
JS		 1777 vc->state.color = color_table[vc->vc_par[i] - 30]
1778 | (vc->state.color & 0xf0);
aada0a34 1779 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
28bc24fc
JS		 1780 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1781 | (vc->state.color & 0x0f);
aada0a34 1782 break;
1da177e4
LT		 1783 }
1784 update_attr(vc);
1785}
1786
de53ce04 1787static void respond_string(const char *p, size_t len, struct tty_port *port)
1da177e4 1788{
de53ce04 1789 tty_insert_flip_string(port, p, len);
5f6a8515 1790 tty_flip_buffer_push(port);
1da177e4
LT		 1791}
1792
1793static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1794{
1795 char buf[40];
de53ce04 1796 int len;
1da177e4 1797
de53ce04
JS		 1798 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1799 (vc->vc_decom ? vc->vc_top + 1 : 1),
1800 vc->state.x + 1);
1801 respond_string(buf, len, tty->port);
1da177e4
LT		 1802}
1803
1804static inline void status_report(struct tty_struct *tty)
1805{
de53ce04
JS		 1806 static const char teminal_ok[] = "\033[0n";
1807
1808 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1da177e4
LT		 1809}
1810
6732c8bb 1811static inline void respond_ID(struct tty_struct *tty)
1da177e4 1812{
9a6f72d9
JS		 1813 /* terminal answer to an ESC-Z or csi0c query. */
1814 static const char vt102_id[] = "\033[?6c";
1815
1816 respond_string(vt102_id, strlen(vt102_id), tty->port);
1da177e4
LT		 1817}
1818
1819void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1820{
1821 char buf[8];
de53ce04 1822 int len;
1da177e4 1823
de53ce04
JS		 1824 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1825 (char)('!' + mrx), (char)('!' + mry));
1826 respond_string(buf, len, tty->port);
1da177e4
LT		 1827}
1828
496124e5 1829/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1da177e4
LT		 1830int mouse_reporting(void)
1831{
1832 return vc_cons[fg_console].d->vc_report_mouse;
1833}
1834
ac751efa 1835/* console_lock is held */
1da177e4
LT		 1836static void set_mode(struct vc_data *vc, int on_off)
1837{
1838 int i;
1839
1840 for (i = 0; i <= vc->vc_npar; i++)
2ff5c5a1 1841 if (vc->vc_priv == EPdec) {
1da177e4
LT		 1842 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1843 case 1: /* Cursor keys send ^[Ox/^[[x */
1844 if (on_off)
1845 set_kbd(vc, decckm);
1846 else
1847 clr_kbd(vc, decckm);
1848 break;
1849 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1850#if 0
1851 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1852 /* this alone does not suffice; some user mode
1853 utility has to change the hardware regs */
1854#endif
1855 break;
1856 case 5: /* Inverted screen on/off */
1857 if (vc->vc_decscnm != on_off) {
1858 vc->vc_decscnm = on_off;
b8209f69
JS		 1859 invert_screen(vc, 0,
1860 vc->vc_screenbuf_size,
1861 false);
1da177e4
LT		 1862 update_attr(vc);
1863 }
1864 break;
1865 case 6: /* Origin relative/absolute */
1866 vc->vc_decom = on_off;
1867 gotoxay(vc, 0, 0);
1868 break;
1869 case 7: /* Autowrap on/off */
1870 vc->vc_decawm = on_off;
1871 break;
1872 case 8: /* Autorepeat on/off */
1873 if (on_off)
1874 set_kbd(vc, decarm);
1875 else
1876 clr_kbd(vc, decarm);
1877 break;
1878 case 9:
1879 vc->vc_report_mouse = on_off ? 1 : 0;
1880 break;
1881 case 25: /* Cursor on/off */
1882 vc->vc_deccm = on_off;
1883 break;
1884 case 1000:
1885 vc->vc_report_mouse = on_off ? 2 : 0;
1886 break;
1887 }
1888 } else {
1889 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1890 case 3: /* Monitor (display ctrls) */
1891 vc->vc_disp_ctrl = on_off;
1892 break;
1893 case 4: /* Insert Mode on/off */
1894 vc->vc_decim = on_off;
1895 break;
1896 case 20: /* Lf, Enter == CrLf/Lf */
1897 if (on_off)
1898 set_kbd(vc, lnm);
1899 else
1900 clr_kbd(vc, lnm);
1901 break;
1902 }
1903 }
1904}
1905
ac751efa 1906/* console_lock is held */
1da177e4
LT		 1907static void setterm_command(struct vc_data *vc)
1908{
c3a834e8
JS		 1909 switch (vc->vc_par[0]) {
1910 case 1: /* set color for underline mode */
1911 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1912 vc->vc_ulcolor = color_table[vc->vc_par[1]];
28bc24fc 1913 if (vc->state.underline)
c3a834e8
JS		 1914 update_attr(vc);
1915 }
1916 break;
1917 case 2: /* set color for half intensity mode */
1918 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1919 vc->vc_halfcolor = color_table[vc->vc_par[1]];
b84ae3dc 1920 if (vc->state.intensity == VCI_HALF_BRIGHT)
c3a834e8
JS		 1921 update_attr(vc);
1922 }
1923 break;
1924 case 8: /* store colors as defaults */
1925 vc->vc_def_color = vc->vc_attr;
1926 if (vc->vc_hi_font_mask == 0x100)
1927 vc->vc_def_color >>= 1;
1928 default_attr(vc);
1929 update_attr(vc);
1930 break;
1931 case 9: /* set blanking interval */
1932 blankinterval = min(vc->vc_par[1], 60U) * 60;
1933 poke_blanked_console();
1934 break;
1935 case 10: /* set bell frequency in Hz */
1936 if (vc->vc_npar >= 1)
1937 vc->vc_bell_pitch = vc->vc_par[1];
1938 else
1939 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1940 break;
1941 case 11: /* set bell duration in msec */
1942 if (vc->vc_npar >= 1)
1943 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1944 msecs_to_jiffies(vc->vc_par[1]) : 0;
1945 else
1946 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1947 break;
1948 case 12: /* bring specified console to the front */
1949 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1950 set_console(vc->vc_par[1] - 1);
1951 break;
1952 case 13: /* unblank the screen */
1953 poke_blanked_console();
1954 break;
1955 case 14: /* set vesa powerdown interval */
1956 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1957 break;
1958 case 15: /* activate the previous console */
1959 set_console(last_console);
1960 break;
1961 case 16: /* set cursor blink duration in msec */
1962 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1963 vc->vc_par[1] <= USHRT_MAX)
1964 vc->vc_cur_blink_ms = vc->vc_par[1];
1965 else
1966 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1967 break;
1da177e4
LT		 1968 }
1969}
1970
ac751efa 1971/* console_lock is held */
1da177e4
LT		 1972static void csi_at(struct vc_data *vc, unsigned int nr)
1973{
28bc24fc
JS		 1974 if (nr > vc->vc_cols - vc->state.x)
1975 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 1976 else if (!nr)
1977 nr = 1;
1978 insert_char(vc, nr);
1979}
1980
ac751efa 1981/* console_lock is held */
1da177e4
LT		 1982static void csi_L(struct vc_data *vc, unsigned int nr)
1983{
28bc24fc
JS		 1984 if (nr > vc->vc_rows - vc->state.y)
1985 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 1986 else if (!nr)
1987 nr = 1;
28bc24fc 1988 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 1989 vc->vc_need_wrap = 0;
1990}
1991
ac751efa 1992/* console_lock is held */
1da177e4
LT		 1993static void csi_P(struct vc_data *vc, unsigned int nr)
1994{
28bc24fc
JS		 1995 if (nr > vc->vc_cols - vc->state.x)
1996 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 1997 else if (!nr)
1998 nr = 1;
1999 delete_char(vc, nr);
2000}
2001
ac751efa 2002/* console_lock is held */
1da177e4
LT		 2003static void csi_M(struct vc_data *vc, unsigned int nr)
2004{
28bc24fc
JS		 2005 if (nr > vc->vc_rows - vc->state.y)
2006 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 2007 else if (!nr)
2008 nr=1;
28bc24fc 2009 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 2010 vc->vc_need_wrap = 0;
2011}
2012
ac751efa 2013/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 2014static void save_cur(struct vc_data *vc)
2015{
28bc24fc 2016 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
1da177e4
LT		 2017}
2018
ac751efa 2019/* console_lock is held */
1da177e4
LT		 2020static void restore_cur(struct vc_data *vc)
2021{
28bc24fc
JS		 2022 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2023
2024 gotoxy(vc, vc->state.x, vc->state.y);
b70ec4d9
JS		 2025 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2026 vc);
1da177e4
LT		 2027 update_attr(vc);
2028 vc->vc_need_wrap = 0;
2029}
2030
b290af68 2031enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
7a99565f 2032 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
3a2b2eb5 2033 ESpalette, ESosc, ESapc, ESpm, ESdcs };
1da177e4 2034
ac751efa 2035/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2036static void reset_terminal(struct vc_data *vc, int do_clear)
2037{
dbee4cff
JS		 2038 unsigned int i;
2039
1da177e4
LT		 2040 vc->vc_top = 0;
2041 vc->vc_bottom = vc->vc_rows;
2042 vc->vc_state = ESnormal;
2ff5c5a1 2043 vc->vc_priv = EPecma;
1da177e4 2044 vc->vc_translate = set_translate(LAT1_MAP, vc);
b70ec4d9
JS		 2045 vc->state.Gx_charset[0] = LAT1_MAP;
2046 vc->state.Gx_charset[1] = GRAF_MAP;
28bc24fc 2047 vc->state.charset = 0;
1da177e4
LT		 2048 vc->vc_need_wrap = 0;
2049 vc->vc_report_mouse = 0;
042f10ec 2050 vc->vc_utf = default_utf8;
1da177e4
LT		 2051 vc->vc_utf_count = 0;
2052
2053 vc->vc_disp_ctrl = 0;
2054 vc->vc_toggle_meta = 0;
2055
2056 vc->vc_decscnm = 0;
2057 vc->vc_decom = 0;
2058 vc->vc_decawm = 1;
f6c06b68 2059 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2060 vc->vc_decim = 0;
2061
079c9534 2062 vt_reset_keyboard(vc->vc_num);
1da177e4 2063
9ea9a886 2064 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2065 vc->vc_complement_mask = vc->vc_s_complement_mask;
2066
2067 default_attr(vc);
2068 update_attr(vc);
2069
dbee4cff
JS		 2070 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2071 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2072 set_bit(i, vc->vc_tab_stop);
1da177e4
LT		 2073
2074 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2075 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2076 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2077
2078 gotoxy(vc, 0, 0);
2079 save_cur(vc);
2080 if (do_clear)
2081 csi_J(vc, 2);
2082}
2083
b4d92b65
JS		 2084static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2085{
b70ec4d9 2086 unsigned char *charset = &vc->state.Gx_charset[which];
b4d92b65
JS		 2087
2088 switch (c) {
2089 case '0':
2090 *charset = GRAF_MAP;
2091 break;
2092 case 'B':
2093 *charset = LAT1_MAP;
2094 break;
2095 case 'U':
2096 *charset = IBMPC_MAP;
2097 break;
2098 case 'K':
2099 *charset = USER_MAP;
2100 break;
2101 }
2102
2103 if (vc->state.charset == which)
2104 vc->vc_translate = set_translate(*charset, vc);
2105}
2106
3a2b2eb5 2107/* is this state an ANSI control string? */
2108static bool ansi_control_string(unsigned int state)
2109{
2110 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2111 return true;
2112 return false;
2113}
2114
ac751efa 2115/* console_lock is held */
1da177e4
LT		 2116static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2117{
2118 /*
2119 * Control characters can be used in the _middle_
3a2b2eb5 2120 * of an escape sequence, aside from ANSI control strings.
1da177e4 2121 */
3a2b2eb5 2122 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
63f3a16d 2123 return;
1da177e4
LT		 2124 switch (c) {
2125 case 0:
2126 return;
2127 case 7:
3a2b2eb5 2128 if (ansi_control_string(vc->vc_state))
63f3a16d
AB		 2129 vc->vc_state = ESnormal;
2130 else if (vc->vc_bell_duration)
1da177e4
LT		 2131 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2132 return;
2133 case 8:
2134 bs(vc);
2135 return;
2136 case 9:
28bc24fc 2137 vc->vc_pos -= (vc->state.x << 1);
dbee4cff
JS		 2138
2139 vc->state.x = find_next_bit(vc->vc_tab_stop,
2140 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2141 vc->state.x + 1);
2142 if (vc->state.x >= VC_TABSTOPS_COUNT)
2143 vc->state.x = vc->vc_cols - 1;
2144
28bc24fc 2145 vc->vc_pos += (vc->state.x << 1);
b293d758 2146 notify_write(vc, '\t');
1da177e4
LT		 2147 return;
2148 case 10: case 11: case 12:
2149 lf(vc);
2150 if (!is_kbd(vc, lnm))
2151 return;
df561f66 2152 fallthrough;
1da177e4
LT		 2153 case 13:
2154 cr(vc);
2155 return;
2156 case 14:
28bc24fc 2157 vc->state.charset = 1;
b70ec4d9 2158 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
1da177e4
LT		 2159 vc->vc_disp_ctrl = 1;
2160 return;
2161 case 15:
28bc24fc 2162 vc->state.charset = 0;
b70ec4d9 2163 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
1da177e4
LT		 2164 vc->vc_disp_ctrl = 0;
2165 return;
2166 case 24: case 26:
2167 vc->vc_state = ESnormal;
2168 return;
2169 case 27:
2170 vc->vc_state = ESesc;
2171 return;
2172 case 127:
2173 del(vc);
2174 return;
2175 case 128+27:
2176 vc->vc_state = ESsquare;
2177 return;
2178 }
2179 switch(vc->vc_state) {
2180 case ESesc:
2181 vc->vc_state = ESnormal;
2182 switch (c) {
2183 case '[':
2184 vc->vc_state = ESsquare;
2185 return;
2186 case ']':
2187 vc->vc_state = ESnonstd;
2188 return;
3a2b2eb5 2189 case '_':
2190 vc->vc_state = ESapc;
2191 return;
2192 case '^':
2193 vc->vc_state = ESpm;
2194 return;
1da177e4
LT		 2195 case '%':
2196 vc->vc_state = ESpercent;
2197 return;
2198 case 'E':
2199 cr(vc);
2200 lf(vc);
2201 return;
2202 case 'M':
2203 ri(vc);
2204 return;
2205 case 'D':
2206 lf(vc);
2207 return;
2208 case 'H':
dbee4cff
JS		 2209 if (vc->state.x < VC_TABSTOPS_COUNT)
2210 set_bit(vc->state.x, vc->vc_tab_stop);
1da177e4 2211 return;
3a2b2eb5 2212 case 'P':
2213 vc->vc_state = ESdcs;
2214 return;
1da177e4
LT		 2215 case 'Z':
2216 respond_ID(tty);
2217 return;
2218 case '7':
2219 save_cur(vc);
2220 return;
2221 case '8':
2222 restore_cur(vc);
2223 return;
2224 case '(':
2225 vc->vc_state = ESsetG0;
2226 return;
2227 case ')':
2228 vc->vc_state = ESsetG1;
2229 return;
2230 case '#':
2231 vc->vc_state = EShash;
2232 return;
2233 case 'c':
2234 reset_terminal(vc, 1);
2235 return;
2236 case '>': /* Numeric keypad */
2237 clr_kbd(vc, kbdapplic);
2238 return;
2239 case '=': /* Appl. keypad */
2240 set_kbd(vc, kbdapplic);
2241 return;
2242 }
2243 return;
2244 case ESnonstd:
2245 if (c=='P') { /* palette escape sequence */
2246 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2247 vc->vc_par[vc->vc_npar] = 0;
2248 vc->vc_npar = 0;
2249 vc->vc_state = ESpalette;
2250 return;
2251 } else if (c=='R') { /* reset palette */
2252 reset_palette(vc);
2253 vc->vc_state = ESnormal;
63f3a16d
AB		 2254 } else if (c>='0' && c<='9')
2255 vc->vc_state = ESosc;
2256 else
1da177e4
LT		 2257 vc->vc_state = ESnormal;
2258 return;
2259 case ESpalette:
74c807ce
AS		 2260 if (isxdigit(c)) {
2261 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2262 if (vc->vc_npar == 7) {
2263 int i = vc->vc_par[0] * 3, j = 1;
2264 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2265 vc->vc_palette[i++] += vc->vc_par[j++];
2266 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2267 vc->vc_palette[i++] += vc->vc_par[j++];
2268 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2269 vc->vc_palette[i] += vc->vc_par[j];
2270 set_palette(vc);
2271 vc->vc_state = ESnormal;
2272 }
2273 } else
2274 vc->vc_state = ESnormal;
2275 return;
2276 case ESsquare:
2277 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2278 vc->vc_par[vc->vc_npar] = 0;
2279 vc->vc_npar = 0;
2280 vc->vc_state = ESgetpars;
2281 if (c == '[') { /* Function key */
2282 vc->vc_state=ESfunckey;
2283 return;
2284 }
5445447b
MH		 2285 switch (c) {
2286 case '?':
2287 vc->vc_priv = EPdec;
2288 return;
2289 case '>':
2290 vc->vc_priv = EPgt;
2291 return;
2292 case '=':
2293 vc->vc_priv = EPeq;
1da177e4 2294 return;
5445447b
MH		 2295 case '<':
2296 vc->vc_priv = EPlt;
2297 return;
2298 }
2299 vc->vc_priv = EPecma;
df561f66 2300 fallthrough;
1da177e4
LT		 2301 case ESgetpars:
2302 if (c == ';' && vc->vc_npar < NPAR - 1) {
2303 vc->vc_npar++;
2304 return;
2305 } else if (c>='0' && c<='9') {
2306 vc->vc_par[vc->vc_npar] *= 10;
2307 vc->vc_par[vc->vc_npar] += c - '0';
2308 return;
b290af68 2309 }
04afcd3a 2310 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
7a99565f
MH		 2311 vc->vc_state = EScsiignore;
2312 return;
2313 }
1da177e4
LT		 2314 vc->vc_state = ESnormal;
2315 switch(c) {
2316 case 'h':
5445447b
MH		 2317 if (vc->vc_priv <= EPdec)
2318 set_mode(vc, 1);
1da177e4
LT		 2319 return;
2320 case 'l':
5445447b
MH		 2321 if (vc->vc_priv <= EPdec)
2322 set_mode(vc, 0);
1da177e4
LT		 2323 return;
2324 case 'c':
2ff5c5a1 2325 if (vc->vc_priv == EPdec) {
1da177e4 2326 if (vc->vc_par[0])
c0e4b3ad
JS		 2327 vc->vc_cursor_type =
2328 CUR_MAKE(vc->vc_par[0],
2329 vc->vc_par[1],
2330 vc->vc_par[2]);
1da177e4 2331 else
9ea9a886 2332 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2333 return;
2334 }
2335 break;
2336 case 'm':
2ff5c5a1 2337 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2338 clear_selection();
2339 if (vc->vc_par[0])
2340 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2341 else
2342 vc->vc_complement_mask = vc->vc_s_complement_mask;
2343 return;
2344 }
2345 break;
2346 case 'n':
2ff5c5a1 2347 if (vc->vc_priv == EPecma) {
1da177e4
LT		 2348 if (vc->vc_par[0] == 5)
2349 status_report(tty);
2350 else if (vc->vc_par[0] == 6)
2351 cursor_report(vc, tty);
2352 }
2353 return;
2354 }
2ff5c5a1
MH		 2355 if (vc->vc_priv != EPecma) {
2356 vc->vc_priv = EPecma;
1da177e4
LT		 2357 return;
2358 }
2359 switch(c) {
2360 case 'G': case '`':
2361 if (vc->vc_par[0])
2362 vc->vc_par[0]--;
28bc24fc 2363 gotoxy(vc, vc->vc_par[0], vc->state.y);
1da177e4
LT		 2364 return;
2365 case 'A':
2366 if (!vc->vc_par[0])
2367 vc->vc_par[0]++;
28bc24fc 2368 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2369 return;
2370 case 'B': case 'e':
2371 if (!vc->vc_par[0])
2372 vc->vc_par[0]++;
28bc24fc 2373 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2374 return;
2375 case 'C': case 'a':
2376 if (!vc->vc_par[0])
2377 vc->vc_par[0]++;
28bc24fc 2378 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
1da177e4
LT		 2379 return;
2380 case 'D':
2381 if (!vc->vc_par[0])
2382 vc->vc_par[0]++;
28bc24fc 2383 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
1da177e4
LT		 2384 return;
2385 case 'E':
2386 if (!vc->vc_par[0])
2387 vc->vc_par[0]++;
28bc24fc 2388 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2389 return;
2390 case 'F':
2391 if (!vc->vc_par[0])
2392 vc->vc_par[0]++;
28bc24fc 2393 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2394 return;
2395 case 'd':
2396 if (vc->vc_par[0])
2397 vc->vc_par[0]--;
28bc24fc 2398 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
1da177e4
LT		 2399 return;
2400 case 'H': case 'f':
2401 if (vc->vc_par[0])
2402 vc->vc_par[0]--;
2403 if (vc->vc_par[1])
2404 vc->vc_par[1]--;
2405 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2406 return;
2407 case 'J':
2408 csi_J(vc, vc->vc_par[0]);
2409 return;
2410 case 'K':
2411 csi_K(vc, vc->vc_par[0]);
2412 return;
2413 case 'L':
2414 csi_L(vc, vc->vc_par[0]);
2415 return;
2416 case 'M':
2417 csi_M(vc, vc->vc_par[0]);
2418 return;
2419 case 'P':
2420 csi_P(vc, vc->vc_par[0]);
2421 return;
2422 case 'c':
2423 if (!vc->vc_par[0])
2424 respond_ID(tty);
2425 return;
2426 case 'g':
dbee4cff
JS		 2427 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2428 set_bit(vc->state.x, vc->vc_tab_stop);
2429 else if (vc->vc_par[0] == 3)
2430 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
1da177e4
LT		 2431 return;
2432 case 'm':
2433 csi_m(vc);
2434 return;
2435 case 'q': /* DECLL - but only 3 leds */
2436 /* map 0,1,2,3 to 0,1,2,4 */
2437 if (vc->vc_par[0] < 4)
079c9534 2438 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2439 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2440 return;
2441 case 'r':
2442 if (!vc->vc_par[0])
2443 vc->vc_par[0]++;
2444 if (!vc->vc_par[1])
2445 vc->vc_par[1] = vc->vc_rows;
2446 /* Minimum allowed region is 2 lines */
2447 if (vc->vc_par[0] < vc->vc_par[1] &&
2448 vc->vc_par[1] <= vc->vc_rows) {
2449 vc->vc_top = vc->vc_par[0] - 1;
2450 vc->vc_bottom = vc->vc_par[1];
2451 gotoxay(vc, 0, 0);
2452 }
2453 return;
2454 case 's':
2455 save_cur(vc);
2456 return;
2457 case 'u':
2458 restore_cur(vc);
2459 return;
2460 case 'X':
2461 csi_X(vc, vc->vc_par[0]);
2462 return;
2463 case '@':
2464 csi_at(vc, vc->vc_par[0]);
2465 return;
2466 case ']': /* setterm functions */
2467 setterm_command(vc);
2468 return;
2469 }
2470 return;
7a99565f
MH		 2471 case EScsiignore:
2472 if (c >= 20 && c <= 0x3f)
2473 return;
2474 vc->vc_state = ESnormal;
2475 return;
1da177e4
LT		 2476 case ESpercent:
2477 vc->vc_state = ESnormal;
2478 switch (c) {
2479 case '@': /* defined in ISO 2022 */
2480 vc->vc_utf = 0;
2481 return;
2482 case 'G': /* prelim official escape code */
2483 case '8': /* retained for compatibility */
2484 vc->vc_utf = 1;
2485 return;
2486 }
2487 return;
2488 case ESfunckey:
2489 vc->vc_state = ESnormal;
2490 return;
2491 case EShash:
2492 vc->vc_state = ESnormal;
2493 if (c == '8') {
2494 /* DEC screen alignment test. kludge :-) */
2495 vc->vc_video_erase_char =
2496 (vc->vc_video_erase_char & 0xff00) | 'E';
2497 csi_J(vc, 2);
2498 vc->vc_video_erase_char =
2499 (vc->vc_video_erase_char & 0xff00) | ' ';
2500 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2501 }
2502 return;
2503 case ESsetG0:
b4d92b65 2504 vc_setGx(vc, 0, c);
1da177e4
LT		 2505 vc->vc_state = ESnormal;
2506 return;
2507 case ESsetG1:
b4d92b65 2508 vc_setGx(vc, 1, c);
1da177e4
LT		 2509 vc->vc_state = ESnormal;
2510 return;
3a2b2eb5 2511 case ESapc:
2512 return;
63f3a16d
AB		 2513 case ESosc:
2514 return;
3a2b2eb5 2515 case ESpm:
2516 return;
2517 case ESdcs:
2518 return;
1da177e4
LT		 2519 default:
2520 vc->vc_state = ESnormal;
2521 }
2522}
2523
2f1a2ccb 2524/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2525 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
a6fdf0c7 2526 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2f1a2ccb
EK		 2527 */
2528struct interval {
2529 uint32_t first;
2530 uint32_t last;
2531};
2532
f0a8d84f 2533static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2534{
f0a8d84f
TM		 2535 uint32_t ucs = *(uint32_t *)key;
2536 struct interval e = *(struct interval *) elt;
2f1a2ccb 2537
f0a8d84f
TM		 2538 if (ucs > e.last)
2539 return 1;
2540 else if (ucs < e.first)
2541 return -1;
2f1a2ccb
EK		 2542 return 0;
2543}
2544
2545static int is_double_width(uint32_t ucs)
2546{
2547 static const struct interval double_width[] = {
2548 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2549 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2550 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2551 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2552 };
f0a8d84f
TM		 2553 if (ucs < double_width[0].first ||
2554 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2555 return 0;
2556
2557 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2558 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2559}
2560
917ae1a9
JS		 2561struct vc_draw_region {
2562 unsigned long from, to;
2563 int x;
2564};
2565
2566static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
d711ea8f 2567{
917ae1a9 2568 if (draw->x < 0)
d711ea8f
JS		 2569 return;
2570
917ae1a9
JS		 2571 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2572 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2573 draw->x);
2574 draw->x = -1;
d711ea8f
JS		 2575}
2576
a018180c
JS		 2577static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2578{
2579 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2580 if (vc->vc_toggle_meta)
2581 c |= 0x80;
2582
2583 return vc->vc_translate[c];
2584 }
2585
2586 return c;
2587}
2588
ede98d12
JS		 2589
2590/**
c38f45ef 2591 * vc_sanitize_unicode - Replace invalid Unicode code points with U+FFFD
ede98d12
JS		 2592 * @c: the received character, or U+FFFD for invalid sequences.
2593 */
2594static inline int vc_sanitize_unicode(const int c)
2595{
2596 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2597 return 0xfffd;
2598
2599 return c;
2600}
2601
694d8a48 2602/**
c38f45ef 2603 * vc_translate_unicode - Combine UTF-8 into Unicode in @vc_utf_char
ea239f1e
JS		 2604 * @vc: virtual console
2605 * @c: character to translate
2606 * @rescan: we return true if we need more (continuation) data
694d8a48
JS		 2607 *
2608 * @vc_utf_char is the being-constructed unicode character.
2609 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2610 * @vc_npar is the number of continuation bytes arrived so far.
2611 */
2612static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2613{
2614 static const u32 utf8_length_changes[] = {
2615 0x0000007f, 0x000007ff, 0x0000ffff,
2616 0x001fffff, 0x03ffffff, 0x7fffffff
2617 };
2618
ede98d12 2619 /* Continuation byte received */
694d8a48 2620 if ((c & 0xc0) == 0x80) {
ede98d12
JS		 2621 /* Unexpected continuation byte? */
2622 if (!vc->vc_utf_count)
694d8a48 2623 return 0xfffd;
ede98d12
JS		 2624
2625 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2626 vc->vc_npar++;
2627 if (--vc->vc_utf_count)
2628 goto need_more_bytes;
2629
2630 /* Got a whole character */
2631 c = vc->vc_utf_char;
2632 /* Reject overlong sequences */
2633 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2634 c > utf8_length_changes[vc->vc_npar])
694d8a48 2635 return 0xfffd;
ede98d12
JS		 2636
2637 return vc_sanitize_unicode(c);
694d8a48 2638 }
ede98d12
JS		 2639
2640 /* Single ASCII byte or first byte of a sequence received */
2641 if (vc->vc_utf_count) {
2642 /* Continuation byte expected */
2643 *rescan = true;
2644 vc->vc_utf_count = 0;
694d8a48 2645 return 0xfffd;
ede98d12 2646 }
694d8a48 2647
ede98d12
JS		 2648 /* Nothing to do if an ASCII byte was received */
2649 if (c <= 0x7f)
2650 return c;
2651
2652 /* First byte of a multibyte sequence received */
2653 vc->vc_npar = 0;
2654 if ((c & 0xe0) == 0xc0) {
2655 vc->vc_utf_count = 1;
2656 vc->vc_utf_char = (c & 0x1f);
2657 } else if ((c & 0xf0) == 0xe0) {
2658 vc->vc_utf_count = 2;
2659 vc->vc_utf_char = (c & 0x0f);
2660 } else if ((c & 0xf8) == 0xf0) {
2661 vc->vc_utf_count = 3;
2662 vc->vc_utf_char = (c & 0x07);
2663 } else if ((c & 0xfc) == 0xf8) {
2664 vc->vc_utf_count = 4;
2665 vc->vc_utf_char = (c & 0x03);
2666 } else if ((c & 0xfe) == 0xfc) {
2667 vc->vc_utf_count = 5;
2668 vc->vc_utf_char = (c & 0x01);
2669 } else {
2670 /* 254 and 255 are invalid */
2671 return 0xfffd;
2672 }
2673
2674need_more_bytes:
2675 return -1;
694d8a48
JS		 2676}
2677
a4236348
JS		 2678static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2679{
2680 /* Do no translation at all in control states */
2681 if (vc->vc_state != ESnormal)
2682 return *c;
2683
2684 if (vc->vc_utf && !vc->vc_disp_ctrl)
2685 return *c = vc_translate_unicode(vc, *c, rescan);
2686
2687 /* no utf or alternate charset mode */
2688 return vc_translate_ascii(vc, *c);
2689}
2690
881c8783
JS		 2691static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2692{
2693 if (!vc->vc_can_do_color)
2694 return vc->vc_attr ^ 0x08;
2695
2696 if (vc->vc_hi_font_mask == 0x100)
2697 return (vc->vc_attr & 0x11) |
2698 ((vc->vc_attr & 0xe0) >> 4) |
2699 ((vc->vc_attr & 0x0e) << 4);
2700
2701 return (vc->vc_attr & 0x88) |
2702 ((vc->vc_attr & 0x70) >> 4) |
2703 ((vc->vc_attr & 0x07) << 4);
2704}
2705
754bda98
JS		 2706static bool vc_is_control(struct vc_data *vc, int tc, int c)
2707{
2708 /*
2709 * A bitmap for codes <32. A bit of 1 indicates that the code
2710 * corresponding to that bit number invokes some special action (such
2711 * as cursor movement) and should not be displayed as a glyph unless
2712 * the disp_ctrl mode is explicitly enabled.
2713 */
2714 static const u32 CTRL_ACTION = 0x0d00ff81;
2715 /* Cannot be overridden by disp_ctrl */
2716 static const u32 CTRL_ALWAYS = 0x0800f501;
2717
2718 if (vc->vc_state != ESnormal)
2719 return true;
2720
2721 if (!tc)
2722 return true;
2723
2724 /*
2725 * If the original code was a control character we only allow a glyph
2726 * to be displayed if the code is not normally used (such as for cursor
2727 * movement) or if the disp_ctrl mode has been explicitly enabled.
2728 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2729 * displayed as control characters, as the console would be pretty
2730 * useless without them; to display an arbitrary font position use the
2731 * direct-to-font zone in UTF-8 mode.
2732 */
2733 if (c < 32) {
2734 if (vc->vc_disp_ctrl)
2735 return CTRL_ALWAYS & BIT(c);
2736 else
2737 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2738 }
2739
2740 if (c == 127 && !vc->vc_disp_ctrl)
2741 return true;
2742
2743 if (c == 128 + 27)
2744 return true;
2745
2746 return false;
2747}
2748
391536ab
JS		 2749static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2750 struct vc_draw_region *draw)
2751{
2752 int next_c;
f3205b29 2753 unsigned char vc_attr = vc->vc_attr;
391536ab
JS		 2754 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2755 u8 width = 1;
2756 bool inverse = false;
2757
2758 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2759 if (is_double_width(c))
2760 width = 2;
2761 }
2762
2763 /* Now try to find out how to display it */
2764 tc = conv_uni_to_pc(vc, tc);
2765 if (tc & ~charmask) {
2766 if (tc == -1 || tc == -2)
2767 return -1; /* nothing to display */
2768
2769 /* Glyph not found */
6923e2d7 2770 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
391536ab
JS		 2771 !(c & ~charmask)) {
2772 /*
2773 * In legacy mode use the glyph we get by a 1:1
2774 * mapping.
2775 * This would make absolutely no sense with Unicode in
2776 * mind, but do this for ASCII characters since a font
2777 * may lack Unicode mapping info and we don't want to
2778 * end up with having question marks only.
2779 */
2780 tc = c;
2781 } else {
2782 /*
2783 * Display U+FFFD. If it's not found, display an inverse
2784 * question mark.
2785 */
2786 tc = conv_uni_to_pc(vc, 0xfffd);
2787 if (tc < 0) {
2788 inverse = true;
2789 tc = conv_uni_to_pc(vc, '?');
2790 if (tc < 0)
2791 tc = '?';
f3205b29
JS		 2792
2793 vc_attr = vc_invert_attr(vc);
2794 con_flush(vc, draw);
391536ab
JS		 2795 }
2796 }
2797 }
2798
391536ab
JS		 2799 next_c = c;
2800 while (1) {
2801 if (vc->vc_need_wrap || vc->vc_decim)
2802 con_flush(vc, draw);
2803 if (vc->vc_need_wrap) {
2804 cr(vc);
2805 lf(vc);
2806 }
2807 if (vc->vc_decim)
2808 insert_char(vc, 1);
2809 vc_uniscr_putc(vc, next_c);
f1bcbe14
JS		 2810
2811 if (himask)
2812 tc = ((tc & 0x100) ? himask : 0) |
2813 (tc & 0xff);
2814 tc |= (vc_attr << 8) & ~himask;
2815
2816 scr_writew(tc, (u16 *)vc->vc_pos);
2817
391536ab
JS		 2818 if (con_should_update(vc) && draw->x < 0) {
2819 draw->x = vc->state.x;
2820 draw->from = vc->vc_pos;
2821 }
2822 if (vc->state.x == vc->vc_cols - 1) {
2823 vc->vc_need_wrap = vc->vc_decawm;
2824 draw->to = vc->vc_pos + 2;
2825 } else {
2826 vc->state.x++;
2827 draw->to = (vc->vc_pos += 2);
2828 }
2829
2830 if (!--width)
2831 break;
2832
2833 /* A space is printed in the second column */
2834 tc = conv_uni_to_pc(vc, ' ');
2835 if (tc < 0)
2836 tc = ' ';
2837 next_c = ' ';
2838 }
2839 notify_write(vc, c);
2840
2841 if (inverse)
2842 con_flush(vc, draw);
2843
2844 return 0;
2845}
2846
ac751efa 2847/* acquires console_lock */
69851e4a 2848static int do_con_write(struct tty_struct *tty, const u8 *buf, int count)
1da177e4 2849{
917ae1a9
JS		 2850 struct vc_draw_region draw = {
2851 .x = -1,
2852 };
391536ab 2853 int c, tc, n = 0;
1da177e4 2854 unsigned int currcons;
1da177e4 2855 struct vc_data *vc;
0341a4d0 2856 struct vt_notifier_param param;
da823b2d 2857 bool rescan;
1da177e4
LT		 2858
2859 if (in_interrupt())
2860 return count;
2861
ac751efa 2862 console_lock();
1da177e4
LT		 2863 vc = tty->driver_data;
2864 if (vc == NULL) {
bccf1da3 2865 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2866 console_unlock();
1da177e4
LT		 2867 return 0;
2868 }
2869
2870 currcons = vc->vc_num;
2871 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2872 /* could this happen? */
2873 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2874 console_unlock();
2875 return 0;
1da177e4 2876 }
1da177e4 2877
1da177e4
LT		 2878
2879 /* undraw cursor first */
6ca8dfd7 2880 if (con_is_fg(vc))
1da177e4
LT		 2881 hide_cursor(vc);
2882
0341a4d0
KD		 2883 param.vc = vc;
2884
6e94dbc7 2885 while (!tty->flow.stopped && count) {
1da177e4 2886 int orig = *buf;
1da177e4
LT		 2887 buf++;
2888 n++;
2889 count--;
0d1ffef5
JS		 2890rescan_last_byte:
2891 c = orig;
da823b2d 2892 rescan = false;
1da177e4 2893
a4236348
JS		 2894 tc = vc_translate(vc, &c, &rescan);
2895 if (tc == -1)
2896 continue;
1da177e4 2897
0341a4d0
KD		 2898 param.c = tc;
2899 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2900 &param) == NOTIFY_STOP)
2901 continue;
2902
391536ab
JS		 2903 if (vc_is_control(vc, tc, c)) {
2904 con_flush(vc, &draw);
2905 do_con_trol(tty, vc, orig);
1da177e4
LT		 2906 continue;
2907 }
391536ab
JS		 2908
2909 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2910 continue;
2911
2912 if (rescan)
2913 goto rescan_last_byte;
1da177e4 2914 }
917ae1a9 2915 con_flush(vc, &draw);
1da177e4 2916 console_conditional_schedule();
b293d758 2917 notify_update(vc);
7e1d2263 2918 console_unlock();
1da177e4 2919 return n;
1da177e4
LT		 2920}
2921
2922/*
2923 * This is the console switching callback.
2924 *
2925 * Doing console switching in a process context allows
2926 * us to do the switches asynchronously (needed when we want
2927 * to switch due to a keyboard interrupt). Synchronization
2928 * with other console code and prevention of re-entrancy is
ac751efa 2929 * ensured with console_lock.
1da177e4 2930 */
65f27f38 2931static void console_callback(struct work_struct *ignored)
1da177e4 2932{
ac751efa 2933 console_lock();
1da177e4
LT		 2934
2935 if (want_console >= 0) {
2936 if (want_console != fg_console &&
2937 vc_cons_allocated(want_console)) {
2938 hide_cursor(vc_cons[fg_console].d);
2939 change_console(vc_cons[want_console].d);
2940 /* we only changed when the console had already
2941 been allocated - a new console is not created
2942 in an interrupt routine */
2943 }
2944 want_console = -1;
2945 }
2946 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2947 do_poke_blanked_console = 0;
2948 poke_blanked_console();
2949 }
2950 if (scrollback_delta) {
2951 struct vc_data *vc = vc_cons[fg_console].d;
2952 clear_selection();
97293de9 2953 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2954 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2955 scrollback_delta = 0;
2956 }
2957 if (blank_timer_expired) {
2958 do_blank_screen(0);
2959 blank_timer_expired = 0;
2960 }
b293d758 2961 notify_update(vc_cons[fg_console].d);
1da177e4 2962
ac751efa 2963 console_unlock();
1da177e4
LT		 2964}
2965
b257bc05 2966int set_console(int nr)
1da177e4 2967{
b257bc05
AJ		 2968 struct vc_data *vc = vc_cons[fg_console].d;
2969
2970 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2971 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2972
2973 /*
2974 * Console switch will fail in console_callback() or
2975 * change_console() so there is no point scheduling
2976 * the callback
2977 *
2978 * Existing set_console() users don't check the return
2979 * value so this shouldn't break anything
2980 */
2981 return -EINVAL;
2982 }
2983
1da177e4
LT		 2984 want_console = nr;
2985 schedule_console_callback();
b257bc05
AJ		 2986
2987 return 0;
1da177e4
LT		 2988}
2989
2990struct tty_driver *console_driver;
2991
2992#ifdef CONFIG_VT_CONSOLE
2993
5ada918b
BW		 2994/**
2995 * vt_kmsg_redirect() - Sets/gets the kernel message console
2996 * @new: The new virtual terminal number or -1 if the console should stay
2997 * unchanged
2998 *
2999 * By default, the kernel messages are always printed on the current virtual
3000 * console. However, the user may modify that default with the
3001 * TIOCL_SETKMSGREDIRECT ioctl call.
3002 *
3003 * This function sets the kernel message console to be @new. It returns the old
3004 * virtual console number. The virtual terminal number 0 (both as parameter and
3005 * return value) means no redirection (i.e. always printed on the currently
3006 * active console).
3007 *
3008 * The parameter -1 means that only the current console is returned, but the
3009 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3010 * case to make the code more understandable.
3011 *
3012 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3013 * the parameter and always returns 0.
3014 */
3015int vt_kmsg_redirect(int new)
3016{
3017 static int kmsg_con;
3018
3019 if (new != -1)
3020 return xchg(&kmsg_con, new);
3021 else
3022 return kmsg_con;
3023}
3024
1da177e4
LT		 3025/*
3026 * Console on virtual terminal
3027 *
3028 * The console must be locked when we get here.
3029 */
3030
3031static void vt_console_print(struct console *co, const char *b, unsigned count)
3032{
3033 struct vc_data *vc = vc_cons[fg_console].d;
3034 unsigned char c;
b0940003 3035 static DEFINE_SPINLOCK(printing_lock);
1da177e4 3036 const ushort *start;
6609cff6 3037 ushort start_x, cnt;
5ada918b 3038 int kmsg_console;
1da177e4 3039
b74dbbe1
DV		 3040 WARN_CONSOLE_UNLOCKED();
3041
3042 /* this protects against concurrent oops only */
b0940003 3043 if (!spin_trylock(&printing_lock))
1da177e4
LT		 3044 return;
3045
5ada918b
BW		 3046 kmsg_console = vt_get_kmsg_redirect();
3047 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3048 vc = vc_cons[kmsg_console - 1].d;
1da177e4 3049
1da177e4
LT		 3050 if (!vc_cons_allocated(fg_console)) {
3051 /* impossible */
3052 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3053 goto quit;
3054 }
3055
8d7fc299 3056 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 3057 goto quit;
3058
3059 /* undraw cursor first */
6ca8dfd7 3060 if (con_is_fg(vc))
1da177e4
LT		 3061 hide_cursor(vc);
3062
3063 start = (ushort *)vc->vc_pos;
28bc24fc 3064 start_x = vc->state.x;
6609cff6 3065 cnt = 0;
1da177e4
LT		 3066 while (count--) {
3067 c = *b++;
3068 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
6609cff6 3069 if (cnt && con_is_visible(vc))
28bc24fc 3070 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
6609cff6 3071 cnt = 0;
1da177e4
LT		 3072 if (c == 8) { /* backspace */
3073 bs(vc);
3074 start = (ushort *)vc->vc_pos;
28bc24fc 3075 start_x = vc->state.x;
1da177e4
LT		 3076 continue;
3077 }
3078 if (c != 13)
3079 lf(vc);
3080 cr(vc);
3081 start = (ushort *)vc->vc_pos;
28bc24fc 3082 start_x = vc->state.x;
1da177e4
LT		 3083 if (c == 10 || c == 13)
3084 continue;
3085 }
6609cff6 3086 vc_uniscr_putc(vc, c);
1da177e4 3087 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 3088 notify_write(vc, c);
1da177e4 3089 cnt++;
28bc24fc 3090 if (vc->state.x == vc->vc_cols - 1) {
1da177e4 3091 vc->vc_need_wrap = 1;
6609cff6
NP		 3092 } else {
3093 vc->vc_pos += 2;
28bc24fc 3094 vc->state.x++;
1da177e4
LT		 3095 }
3096 }
6609cff6 3097 if (cnt && con_is_visible(vc))
28bc24fc 3098 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
1da177e4 3099 set_cursor(vc);
b293d758 3100 notify_update(vc);
1da177e4
LT		 3101
3102quit:
b0940003 3103 spin_unlock(&printing_lock);
1da177e4
LT		 3104}
3105
3106static struct tty_driver *vt_console_device(struct console *c, int *index)
3107{
3108 *index = c->index ? c->index-1 : fg_console;
3109 return console_driver;
3110}
3111
7370a25f
SS		 3112static int vt_console_setup(struct console *co, char *options)
3113{
3114 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3115}
3116
1da177e4
LT		 3117static struct console vt_console_driver = {
3118 .name = "tty",
7370a25f 3119 .setup = vt_console_setup,
1da177e4
LT		 3120 .write = vt_console_print,
3121 .device = vt_console_device,
3122 .unblank = unblank_screen,
3123 .flags = CON_PRINTBUFFER,
3124 .index = -1,
3125};
3126#endif
3127
3128/*
3129 * Handling of Linux-specific VC ioctls
3130 */
3131
3132/*
ac751efa 3133 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3134 *
3135 * There are some functions which don't need it.
3136 *
3137 * There are some functions which can sleep for arbitrary periods
3138 * (paste_selection) but we don't need the lock there anyway.
3139 *
496124e5 3140 * set_selection_user has locking, and definitely needs it
1da177e4
LT		 3141 */
3142
3143int tioclinux(struct tty_struct *tty, unsigned long arg)
3144{
3145 char type, data;
3146 char __user *p = (char __user *)arg;
3147 int lines;
3148 int ret;
3149
1da177e4
LT		 3150 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3151 return -EPERM;
3152 if (get_user(type, p))
3153 return -EFAULT;
3154 ret = 0;
04f378b1 3155
6b97370b
JSS		 3156 switch (type) {
3157 case TIOCL_SETSEL:
8d1b43f6
HB		 3158 if (!capable(CAP_SYS_ADMIN))
3159 return -EPERM;
71ca6e4b 3160 return set_selection_user((struct tiocl_selection
6b97370b 3161 __user *)(p+1), tty);
6b97370b 3162 case TIOCL_PASTESEL:
8d1b43f6
HB		 3163 if (!capable(CAP_SYS_ADMIN))
3164 return -EPERM;
71ca6e4b 3165 return paste_selection(tty);
6b97370b
JSS		 3166 case TIOCL_UNBLANKSCREEN:
3167 console_lock();
3168 unblank_screen();
3169 console_unlock();
3170 break;
3171 case TIOCL_SELLOADLUT:
8d1b43f6
HB		 3172 if (!capable(CAP_SYS_ADMIN))
3173 return -EPERM;
6b97370b
JSS		 3174 console_lock();
3175 ret = sel_loadlut(p);
3176 console_unlock();
3177 break;
3178 case TIOCL_GETSHIFTSTATE:
3179 /*
3180 * Make it possible to react to Shift+Mousebutton. Note that
3181 * 'shift_state' is an undocumented kernel-internal variable;
3182 * programs not closely related to the kernel should not use
3183 * this.
3184 */
3185 data = vt_get_shift_state();
71ca6e4b 3186 return put_user(data, p);
6b97370b
JSS		 3187 case TIOCL_GETMOUSEREPORTING:
3188 console_lock(); /* May be overkill */
3189 data = mouse_reporting();
3190 console_unlock();
71ca6e4b 3191 return put_user(data, p);
6b97370b
JSS		 3192 case TIOCL_SETVESABLANK:
3193 console_lock();
3194 ret = set_vesa_blanking(p);
3195 console_unlock();
3196 break;
3197 case TIOCL_GETKMSGREDIRECT:
3198 data = vt_get_kmsg_redirect();
71ca6e4b 3199 return put_user(data, p);
6b97370b 3200 case TIOCL_SETKMSGREDIRECT:
71ca6e4b
JSS		 3201 if (!capable(CAP_SYS_ADMIN))
3202 return -EPERM;
3203
3204 if (get_user(data, p+1))
3205 return -EFAULT;
3206
3207 vt_kmsg_redirect(data);
3208
6b97370b
JSS		 3209 break;
3210 case TIOCL_GETFGCONSOLE:
3211 /*
3212 * No locking needed as this is a transiently correct return
3213 * anyway if the caller hasn't disabled switching.
3214 */
71ca6e4b 3215 return fg_console;
6b97370b 3216 case TIOCL_SCROLLCONSOLE:
71ca6e4b
JSS		 3217 if (get_user(lines, (s32 __user *)(p+4)))
3218 return -EFAULT;
3219
3220 /*
3221 * Needs the console lock here. Note that lots of other calls
3222 * need fixing before the lock is actually useful!
3223 */
3224 console_lock();
3225 scrollfront(vc_cons[fg_console].d, lines);
3226 console_unlock();
6b97370b
JSS		 3227 break;
3228 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3229 console_lock();
3230 ignore_poke = 1;
3231 do_blank_screen(0);
3232 console_unlock();
3233 break;
3234 case TIOCL_BLANKEDSCREEN:
71ca6e4b 3235 return console_blanked;
6b97370b 3236 default:
71ca6e4b 3237 return -EINVAL;
1da177e4 3238 }
6b97370b 3239
1da177e4
LT		 3240 return ret;
3241}
3242
3243/*
3244 * /dev/ttyN handling
3245 */
3246
95713967 3247static ssize_t con_write(struct tty_struct *tty, const u8 *buf, size_t count)
1da177e4
LT		 3248{
3249 int retval;
3250
3251 retval = do_con_write(tty, buf, count);
3252 con_flush_chars(tty);
3253
3254 return retval;
3255}
3256
dcaafbe6 3257static int con_put_char(struct tty_struct *tty, u8 ch)
1da177e4 3258{
5d19f546 3259 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3260}
3261
03b3b1a2 3262static unsigned int con_write_room(struct tty_struct *tty)
1da177e4 3263{
6e94dbc7 3264 if (tty->flow.stopped)
1da177e4 3265 return 0;
a88a69c9 3266 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3267}
3268
1da177e4
LT		 3269/*
3270 * con_throttle and con_unthrottle are only used for
3271 * paste_selection(), which has to stuff in a large number of
3272 * characters...
3273 */
3274static void con_throttle(struct tty_struct *tty)
3275{
3276}
3277
3278static void con_unthrottle(struct tty_struct *tty)
3279{
3280 struct vc_data *vc = tty->driver_data;
3281
3282 wake_up_interruptible(&vc->paste_wait);
3283}
3284
3285/*
3286 * Turn the Scroll-Lock LED on when the tty is stopped
3287 */
3288static void con_stop(struct tty_struct *tty)
3289{
3290 int console_num;
3291 if (!tty)
3292 return;
3293 console_num = tty->index;
3294 if (!vc_cons_allocated(console_num))
3295 return;
079c9534 3296 vt_kbd_con_stop(console_num);
1da177e4
LT		 3297}
3298
3299/*
3300 * Turn the Scroll-Lock LED off when the console is started
3301 */
3302static void con_start(struct tty_struct *tty)
3303{
3304 int console_num;
3305 if (!tty)
3306 return;
3307 console_num = tty->index;
3308 if (!vc_cons_allocated(console_num))
3309 return;
079c9534 3310 vt_kbd_con_start(console_num);
1da177e4
LT		 3311}
3312
3313static void con_flush_chars(struct tty_struct *tty)
3314{
3315 struct vc_data *vc;
3316
3317 if (in_interrupt()) /* from flush_to_ldisc */
3318 return;
3319
3320 /* if we race with con_close(), vt may be null */
ac751efa 3321 console_lock();
1da177e4
LT		 3322 vc = tty->driver_data;
3323 if (vc)
3324 set_cursor(vc);
ac751efa 3325 console_unlock();
1da177e4
LT		 3326}
3327
3328/*
3329 * Allocate the console screen memory.
3330 */
bc1e99d9 3331static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3332{
3333 unsigned int currcons = tty->index;
bc1e99d9
JS		 3334 struct vc_data *vc;
3335 int ret;
1da177e4 3336
ac751efa 3337 console_lock();
bc1e99d9
JS		 3338 ret = vc_allocate(currcons);
3339 if (ret)
3340 goto unlock;
feebed65 3341
bc1e99d9 3342 vc = vc_cons[currcons].d;
1da177e4 3343
bc1e99d9
JS		 3344 /* Still being freed */
3345 if (vc->port.tty) {
3346 ret = -ERESTARTSYS;
3347 goto unlock;
3348 }
3349
3350 ret = tty_port_install(&vc->port, driver, tty);
3351 if (ret)
3352 goto unlock;
3353
3354 tty->driver_data = vc;
3355 vc->port.tty = tty;
ca4463bf 3356 tty_port_get(&vc->port);
bc1e99d9
JS		 3357
3358 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3359 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3360 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3361 }
bc1e99d9 3362 if (vc->vc_utf)
adc8d746 3363 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3364 else
adc8d746 3365 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3366unlock:
ac751efa 3367 console_unlock();
1da177e4
LT		 3368 return ret;
3369}
3370
bc1e99d9
JS		 3371static int con_open(struct tty_struct *tty, struct file *filp)
3372{
3373 /* everything done in install */
3374 return 0;
3375}
3376
3377
1da177e4
LT		 3378static void con_close(struct tty_struct *tty, struct file *filp)
3379{
feebed65
AC		 3380 /* Nothing to do - we defer to shutdown */
3381}
1da177e4 3382
feebed65
AC		 3383static void con_shutdown(struct tty_struct *tty)
3384{
3385 struct vc_data *vc = tty->driver_data;
3386 BUG_ON(vc == NULL);
ac751efa 3387 console_lock();
8ce73264 3388 vc->port.tty = NULL;
ac751efa 3389 console_unlock();
1da177e4
LT		 3390}
3391
ca4463bf
EB		 3392static void con_cleanup(struct tty_struct *tty)
3393{
3394 struct vc_data *vc = tty->driver_data;
3395
3396 tty_port_put(&vc->port);
3397}
3398
3855ae1c 3399static int default_color = 7; /* white */
fa6ce9ab
JE		 3400static int default_italic_color = 2; // green (ASCII)
3401static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3402module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3403module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3404module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3405
f68279ca 3406static void vc_init(struct vc_data *vc, int do_clear)
1da177e4
LT		 3407{
3408 int j, k ;
3409
1da177e4
LT		 3410 set_origin(vc);
3411 vc->vc_pos = vc->vc_origin;
3412 reset_vc(vc);
3413 for (j=k=0; j<16; j++) {
3414 vc->vc_palette[k++] = default_red[j] ;
3415 vc->vc_palette[k++] = default_grn[j] ;
3416 vc->vc_palette[k++] = default_blu[j] ;
3417 }
3855ae1c 3418 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3419 vc->vc_ulcolor = default_underline_color;
3420 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3421 vc->vc_halfcolor = 0x08; /* grey */
3422 init_waitqueue_head(&vc->paste_wait);
3423 reset_terminal(vc, do_clear);
3424}
3425
3426/*
3427 * This routine initializes console interrupts, and does nothing
3428 * else. If you want the screen to clear, call tty_write with
3429 * the appropriate escape-sequence.
3430 */
3431
3432static int __init con_init(void)
3433{
3434 const char *display_desc = NULL;
3435 struct vc_data *vc;
3e795de7 3436 unsigned int currcons = 0, i;
1da177e4 3437
ac751efa 3438 console_lock();
1da177e4 3439
805ece2a
AS		 3440 if (!conswitchp)
3441 conswitchp = &dummy_con;
3442 display_desc = conswitchp->con_startup();
1da177e4
LT		 3443 if (!display_desc) {
3444 fg_console = 0;
ac751efa 3445 console_unlock();
1da177e4
LT		 3446 return 0;
3447 }
3448
3e795de7
AD		 3449 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450 struct con_driver *con_driver = &registered_con_driver[i];
3451
3452 if (con_driver->con == NULL) {
3453 con_driver->con = conswitchp;
3454 con_driver->desc = display_desc;
3455 con_driver->flag = CON_DRIVER_FLAG_INIT;
3456 con_driver->first = 0;
3457 con_driver->last = MAX_NR_CONSOLES - 1;
3458 break;
3459 }
3460 }
3461
3462 for (i = 0; i < MAX_NR_CONSOLES; i++)
3463 con_driver_map[i] = conswitchp;
3464
1da177e4
LT		 3465 if (blankinterval) {
3466 blank_state = blank_normal_wait;
f324edc8 3467 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3468 }
3469
1da177e4 3470 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3471 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3472 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3473 tty_port_init(&vc->port);
1da177e4 3474 visual_init(vc, currcons, 1);
ce684552 3475 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
a5f4f52e 3476 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
f68279ca 3477 vc_init(vc, currcons || !vc->vc_sw->con_save_screen);
1da177e4
LT		 3478 }
3479 currcons = fg_console = 0;
3480 master_display_fg = vc = vc_cons[currcons].d;
3481 set_origin(vc);
3482 save_screen(vc);
28bc24fc 3483 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 3484 csi_J(vc, 0);
3485 update_screen(vc);
5da527aa 3486 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3487 vc->vc_can_do_color ? "colour" : "mono",
3488 display_desc, vc->vc_cols, vc->vc_rows);
1da177e4 3489
ac751efa 3490 console_unlock();
1da177e4
LT		 3491
3492#ifdef CONFIG_VT_CONSOLE
3493 register_console(&vt_console_driver);
3494#endif
3495 return 0;
3496}
3497console_initcall(con_init);
3498
b68e31d0 3499static const struct tty_operations con_ops = {
bc1e99d9 3500 .install = con_install,
1da177e4
LT		 3501 .open = con_open,
3502 .close = con_close,
3503 .write = con_write,
3504 .write_room = con_write_room,
3505 .put_char = con_put_char,
3506 .flush_chars = con_flush_chars,
1da177e4 3507 .ioctl = vt_ioctl,
e9216651
AB		 3508#ifdef CONFIG_COMPAT
3509 .compat_ioctl = vt_compat_ioctl,
3510#endif
1da177e4
LT		 3511 .stop = con_stop,
3512 .start = con_start,
3513 .throttle = con_throttle,
3514 .unthrottle = con_unthrottle,
8c9a9dd0 3515 .resize = vt_resize,
ca4463bf
EB		 3516 .shutdown = con_shutdown,
3517 .cleanup = con_cleanup,
1da177e4
LT		 3518};
3519
d81ed103
AC		 3520static struct cdev vc0_cdev;
3521
fbc92a34
KS		 3522static ssize_t show_tty_active(struct device *dev,
3523 struct device_attribute *attr, char *buf)
3524{
3525 return sprintf(buf, "tty%d\n", fg_console + 1);
3526}
3527static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3528
1083a7be
TI		 3529static struct attribute *vt_dev_attrs[] = {
3530 &dev_attr_active.attr,
3531 NULL
3532};
3533
3534ATTRIBUTE_GROUPS(vt_dev);
3535
d81ed103 3536int __init vty_init(const struct file_operations *console_fops)
1da177e4 3537{
d81ed103
AC		 3538 cdev_init(&vc0_cdev, console_fops);
3539 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3540 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3541 panic("Couldn't register /dev/tty0 driver\n");
862d8312 3542 tty0dev = device_create_with_groups(&tty_class, NULL,
1083a7be
TI		 3543 MKDEV(TTY_MAJOR, 0), NULL,
3544 vt_dev_groups, "tty0");
fbc92a34
KS		 3545 if (IS_ERR(tty0dev))
3546 tty0dev = NULL;
d81ed103 3547
1da177e4
LT		 3548 vcs_init();
3549
39b7b42b
JS		 3550 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3551 TTY_DRIVER_RESET_TERMIOS);
3552 if (IS_ERR(console_driver))
1da177e4 3553 panic("Couldn't allocate console driver\n");
2f16669d 3554
1da177e4
LT		 3555 console_driver->name = "tty";
3556 console_driver->name_base = 1;
3557 console_driver->major = TTY_MAJOR;
3558 console_driver->minor_start = 1;
3559 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3560 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3561 if (default_utf8)
3562 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3563 tty_set_operations(console_driver, &con_ops);
3564 if (tty_register_driver(console_driver))
3565 panic("Couldn't register console driver\n");
1da177e4
LT		 3566 kbd_init();
3567 console_map_init();
1da177e4
LT		 3568#ifdef CONFIG_MDA_CONSOLE
3569 mda_console_init();
3570#endif
3571 return 0;
3572}
3573
6db4063c
AD		 3574static struct class *vtconsole_class;
3575
50e244cc 3576static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3577 int deflt)
1da177e4 3578{
3e795de7
AD		 3579 struct module *owner = csw->owner;
3580 const char *desc = NULL;
3581 struct con_driver *con_driver;
3582 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3583
1da177e4
LT		 3584 if (!try_module_get(owner))
3585 return -ENODEV;
3586
50e244cc 3587 WARN_CONSOLE_UNLOCKED();
1c8ce271 3588
3e795de7
AD		 3589 /* check if driver is registered */
3590 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3591 con_driver = &registered_con_driver[i];
3592
3593 if (con_driver->con == csw) {
3594 desc = con_driver->desc;
3595 retval = 0;
3596 break;
3597 }
3598 }
3599
3600 if (retval)
3601 goto err;
3602
3603 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3604 csw->con_startup();
3605 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3606 }
1c8ce271 3607
1da177e4
LT		 3608 if (deflt) {
3609 if (conswitchp)
3610 module_put(conswitchp->owner);
1c8ce271 3611
1da177e4
LT		 3612 __module_get(owner);
3613 conswitchp = csw;
3614 }
3615
3e795de7
AD		 3616 first = max(first, con_driver->first);
3617 last = min(last, con_driver->last);
3618
1da177e4
LT		 3619 for (i = first; i <= last; i++) {
3620 int old_was_color;
3621 struct vc_data *vc = vc_cons[i].d;
3622
3623 if (con_driver_map[i])
3624 module_put(con_driver_map[i]->owner);
3625 __module_get(owner);
3626 con_driver_map[i] = csw;
3627
3628 if (!vc || !vc->vc_sw)
3629 continue;
3630
3631 j = i;
1c8ce271 3632
6ca8dfd7 3633 if (con_is_visible(vc)) {
4ee1acce 3634 k = i;
1da177e4 3635 save_screen(vc);
4ee1acce
DH		 3636 }
3637
1da177e4
LT		 3638 old_was_color = vc->vc_can_do_color;
3639 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3640 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3641 visual_init(vc, i, 0);
1c8ce271 3642 set_origin(vc);
1da177e4
LT		 3643 update_attr(vc);
3644
3645 /* If the console changed between mono <-> color, then
3646 * the attributes in the screenbuf will be wrong. The
3647 * following resets all attributes to something sane.
3648 */
3649 if (old_was_color != vc->vc_can_do_color)
3650 clear_buffer_attributes(vc);
1da177e4 3651 }
4ee1acce 3652
1ffdda95 3653 pr_info("Console: switching ");
1da177e4 3654 if (!deflt)
bccf1da3 3655 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3656 if (j >= 0) {
3657 struct vc_data *vc = vc_cons[j].d;
3658
bccf1da3
JP		 3659 pr_cont("to %s %s %dx%d\n",
3660 vc->vc_can_do_color ? "colour" : "mono",
3661 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3662
3663 if (k >= 0) {
3664 vc = vc_cons[k].d;
3665 update_screen(vc);
3666 }
bccf1da3
JP		 3667 } else {
3668 pr_cont("to %s\n", desc);
3669 }
1da177e4 3670
3e795de7
AD		 3671 retval = 0;
3672err:
1da177e4 3673 module_put(owner);
3e795de7
AD		 3674 return retval;
3675};
1da177e4 3676
50e244cc 3677
13ae6645 3678#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86 3679int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3680{
3e795de7
AD		 3681 struct module *owner = csw->owner;
3682 const struct consw *defcsw = NULL;
3683 struct con_driver *con_driver = NULL, *con_back = NULL;
3684 int i, retval = -ENODEV;
1da177e4 3685
3e795de7
AD		 3686 if (!try_module_get(owner))
3687 return -ENODEV;
3688
e93a9a86 3689 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3690
3691 /* check if driver is registered and if it is unbindable */
3692 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3693 con_driver = &registered_con_driver[i];
3694
3695 if (con_driver->con == csw &&
6db4063c 3696 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3697 retval = 0;
3698 break;
3699 }
3700 }
3701
e93a9a86 3702 if (retval)
3e795de7 3703 goto err;
3e795de7 3704
6db4063c
AD		 3705 retval = -ENODEV;
3706
3e795de7
AD		 3707 /* check if backup driver exists */
3708 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3709 con_back = &registered_con_driver[i];
3710
249f7b3e 3711 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3712 defcsw = con_back->con;
3713 retval = 0;
3714 break;
3715 }
3716 }
3717
e93a9a86 3718 if (retval)
3e795de7 3719 goto err;
3e795de7 3720
e93a9a86 3721 if (!con_is_bound(csw))
3e795de7 3722 goto err;
3e795de7
AD		 3723
3724 first = max(first, con_driver->first);
3725 last = min(last, con_driver->last);
3726
3727 for (i = first; i <= last; i++) {
1da177e4
LT		 3728 if (con_driver_map[i] == csw) {
3729 module_put(csw->owner);
3730 con_driver_map[i] = NULL;
3731 }
3e795de7
AD		 3732 }
3733
3734 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3735 const struct consw *defconsw = conswitchp;
3736
3e795de7
AD		 3737 defcsw->con_startup();
3738 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3739 /*
3740 * vgacon may change the default driver to point
3741 * to dummycon, we restore it here...
3742 */
3743 conswitchp = defconsw;
3e795de7
AD		 3744 }
3745
3746 if (!con_is_bound(csw))
3747 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3748
6db4063c 3749 /* ignore return value, binding should not fail */
50e244cc 3750 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3751err:
3752 module_put(owner);
3753 return retval;
3754
3755}
e93a9a86 3756EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3757
6db4063c
AD		 3758static int vt_bind(struct con_driver *con)
3759{
3760 const struct consw *defcsw = NULL, *csw = NULL;
3761 int i, more = 1, first = -1, last = -1, deflt = 0;
3762
77232f79 3763 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3764 goto err;
3765
3766 csw = con->con;
3767
3768 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3769 struct con_driver *con = &registered_con_driver[i];
3770
3771 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3772 defcsw = con->con;
3773 break;
3774 }
3775 }
3776
3777 if (!defcsw)
3778 goto err;
3779
3780 while (more) {
3781 more = 0;
3782
3783 for (i = con->first; i <= con->last; i++) {
3784 if (con_driver_map[i] == defcsw) {
3785 if (first == -1)
3786 first = i;
3787 last = i;
3788 more = 1;
3789 } else if (first != -1)
3790 break;
3791 }
3792
3793 if (first == 0 && last == MAX_NR_CONSOLES -1)
3794 deflt = 1;
3795
4c215fe8 3796 if (first != -1)
c62a1e57 3797 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3798
3799 first = -1;
3800 last = -1;
3801 deflt = 0;
3802 }
3803
3804err:
3805 return 0;
3806}
3807
3808static int vt_unbind(struct con_driver *con)
3809{
3810 const struct consw *csw = NULL;
3811 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3812 int ret;
6db4063c 3813
77232f79 3814 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3815 goto err;
3816
3817 csw = con->con;
3818
3819 while (more) {
3820 more = 0;
3821
3822 for (i = con->first; i <= con->last; i++) {
3823 if (con_driver_map[i] == csw) {
3824 if (first == -1)
3825 first = i;
3826 last = i;
3827 more = 1;
3828 } else if (first != -1)
3829 break;
3830 }
3831
3832 if (first == 0 && last == MAX_NR_CONSOLES -1)
3833 deflt = 1;
3834
618f2b90 3835 if (first != -1) {
f418f2ec 3836 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3837 if (ret != 0)
3838 return ret;
618f2b90 3839 }
6db4063c
AD		 3840
3841 first = -1;
3842 last = -1;
3843 deflt = 0;
3844 }
3845
3846err:
3847 return 0;
3848}
13ae6645
AD		 3849#else
3850static inline int vt_bind(struct con_driver *con)
3851{
3852 return 0;
3853}
3854static inline int vt_unbind(struct con_driver *con)
3855{
3856 return 0;
3857}
3858#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3859
805952a8 3860static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3861 const char *buf, size_t count)
3862{
805952a8 3863 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3864 int bind = simple_strtoul(buf, NULL, 0);
3865
4c215fe8
ID		 3866 console_lock();
3867
6db4063c
AD		 3868 if (bind)
3869 vt_bind(con);
3870 else
3871 vt_unbind(con);
3872
4c215fe8
ID		 3873 console_unlock();
3874
6db4063c
AD		 3875 return count;
3876}
3877
805952a8
GKH		 3878static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3879 char *buf)
6db4063c 3880{
805952a8 3881 struct con_driver *con = dev_get_drvdata(dev);
61d51456
DV		 3882 int bind;
3883
3884 console_lock();
3885 bind = con_is_bound(con->con);
3886 console_unlock();
6db4063c 3887
ebaed53c 3888 return sysfs_emit(buf, "%i\n", bind);
6db4063c
AD		 3889}
3890
805952a8
GKH		 3891static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3892 char *buf)
6db4063c 3893{
805952a8 3894 struct con_driver *con = dev_get_drvdata(dev);
6db4063c 3895
ebaed53c 3896 return sysfs_emit(buf, "%s %s\n",
6db4063c
AD		 3897 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3898 con->desc);
3899
3900}
3901
1083a7be
TI		 3902static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3903static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3904
3905static struct attribute *con_dev_attrs[] = {
3906 &dev_attr_bind.attr,
3907 &dev_attr_name.attr,
3908 NULL
6db4063c
AD		 3909};
3910
1083a7be
TI		 3911ATTRIBUTE_GROUPS(con_dev);
3912
805952a8 3913static int vtconsole_init_device(struct con_driver *con)
6db4063c 3914{
928e964f 3915 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3916 return 0;
6db4063c
AD		 3917}
3918
805952a8 3919static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3920{
1083a7be 3921 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3922}
3923
3e795de7
AD		 3924/**
3925 * con_is_bound - checks if driver is bound to the console
3926 * @csw: console driver
3927 *
3928 * RETURNS: zero if unbound, nonzero if bound
3929 *
3930 * Drivers can call this and if zero, they should release
3931 * all resources allocated on con_startup()
3932 */
3933int con_is_bound(const struct consw *csw)
3934{
3935 int i, bound = 0;
3936
ddde3c18
DV		 3937 WARN_CONSOLE_UNLOCKED();
3938
3e795de7
AD		 3939 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3940 if (con_driver_map[i] == csw) {
3941 bound = 1;
3942 break;
3943 }
3944 }
3945
3946 return bound;
3947}
3948EXPORT_SYMBOL(con_is_bound);
3949
ddde3c18
DV		 3950/**
3951 * con_is_visible - checks whether the current console is visible
3952 * @vc: virtual console
3953 *
3954 * RETURNS: zero if not visible, nonzero if visible
3955 */
3956bool con_is_visible(const struct vc_data *vc)
3957{
3958 WARN_CONSOLE_UNLOCKED();
3959
3960 return *vc->vc_display_fg == vc;
3961}
3962EXPORT_SYMBOL(con_is_visible);
3963
b45cfba4
JB		 3964/**
3965 * con_debug_enter - prepare the console for the kernel debugger
ea239f1e 3966 * @vc: virtual console
b45cfba4
JB		 3967 *
3968 * Called when the console is taken over by the kernel debugger, this
3969 * function needs to save the current console state, then put the console
3970 * into a state suitable for the kernel debugger.
3971 *
3972 * RETURNS:
3973 * Zero on success, nonzero if a failure occurred when trying to prepare
3974 * the console for the debugger.
3975 */
3976int con_debug_enter(struct vc_data *vc)
3977{
3978 int ret = 0;
3979
3980 saved_fg_console = fg_console;
3981 saved_last_console = last_console;
3982 saved_want_console = want_console;
3983 saved_vc_mode = vc->vc_mode;
beed5336 3984 saved_console_blanked = console_blanked;
b45cfba4
JB		 3985 vc->vc_mode = KD_TEXT;
3986 console_blanked = 0;
3987 if (vc->vc_sw->con_debug_enter)
3988 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3989#ifdef CONFIG_KGDB_KDB
3990 /* Set the initial LINES variable if it is not already set */
3991 if (vc->vc_rows < 999) {
3992 int linecount;
3993 char lns[4];
3994 const char *setargs[3] = {
3995 "set",
3996 "LINES",
3997 lns,
3998 };
3999 if (kdbgetintenv(setargs[0], &linecount)) {
4000 snprintf(lns, 4, "%i", vc->vc_rows);
4001 kdb_set(2, setargs);
4002 }
4003 }
17b572e8
JW		 4004 if (vc->vc_cols < 999) {
4005 int colcount;
4006 char cols[4];
4007 const char *setargs[3] = {
4008 "set",
4009 "COLUMNS",
4010 cols,
4011 };
4012 if (kdbgetintenv(setargs[0], &colcount)) {
4013 snprintf(cols, 4, "%i", vc->vc_cols);
4014 kdb_set(2, setargs);
4015 }
4016 }
81d44507 4017#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 4018 return ret;
4019}
4020EXPORT_SYMBOL_GPL(con_debug_enter);
4021
4022/**
4023 * con_debug_leave - restore console state
b45cfba4
JB		 4024 *
4025 * Restore the console state to what it was before the kernel debugger
4026 * was invoked.
4027 *
4028 * RETURNS:
4029 * Zero on success, nonzero if a failure occurred when trying to restore
4030 * the console.
4031 */
4032int con_debug_leave(void)
4033{
4034 struct vc_data *vc;
4035 int ret = 0;
4036
4037 fg_console = saved_fg_console;
4038 last_console = saved_last_console;
4039 want_console = saved_want_console;
beed5336 4040 console_blanked = saved_console_blanked;
b45cfba4
JB		 4041 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4042
4043 vc = vc_cons[fg_console].d;
4044 if (vc->vc_sw->con_debug_leave)
4045 ret = vc->vc_sw->con_debug_leave(vc);
4046 return ret;
4047}
4048EXPORT_SYMBOL_GPL(con_debug_leave);
4049
50e244cc 4050static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 4051{
4052 struct module *owner = csw->owner;
4053 struct con_driver *con_driver;
4054 const char *desc;
96317e9e 4055 int i, retval;
3e795de7 4056
50e244cc
AC		 4057 WARN_CONSOLE_UNLOCKED();
4058
3e795de7
AD		 4059 if (!try_module_get(owner))
4060 return -ENODEV;
4061
3e795de7
AD		 4062 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4063 con_driver = &registered_con_driver[i];
4064
4065 /* already registered */
96317e9e 4066 if (con_driver->con == csw) {
c55c63c6 4067 retval = -EBUSY;
96317e9e
JS		 4068 goto err;
4069 }
3e795de7
AD		 4070 }
4071
3e795de7 4072 desc = csw->con_startup();
6798df4c
JS		 4073 if (!desc) {
4074 retval = -ENODEV;
3e795de7 4075 goto err;
6798df4c 4076 }
3e795de7
AD		 4077
4078 retval = -EINVAL;
4079
4080 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4081 con_driver = &registered_con_driver[i];
4082
d364b5c3
ID		 4083 if (con_driver->con == NULL &&
4084 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 4085 con_driver->con = csw;
4086 con_driver->desc = desc;
6db4063c
AD		 4087 con_driver->node = i;
4088 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 4089 CON_DRIVER_FLAG_INIT;
4090 con_driver->first = first;
4091 con_driver->last = last;
4092 retval = 0;
4093 break;
4094 }
4095 }
4096
6db4063c
AD		 4097 if (retval)
4098 goto err;
4099
1083a7be
TI		 4100 con_driver->dev =
4101 device_create_with_groups(vtconsole_class, NULL,
4102 MKDEV(0, con_driver->node),
4103 con_driver, con_dev_groups,
4104 "vtcon%i", con_driver->node);
805952a8 4105 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 4106 pr_warn("Unable to create device for %s; errno = %ld\n",
4107 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 4108 con_driver->dev = NULL;
6db4063c 4109 } else {
805952a8 4110 vtconsole_init_device(con_driver);
6db4063c 4111 }
928e964f 4112
3e795de7 4113err:
3e795de7
AD		 4114 module_put(owner);
4115 return retval;
4116}
50e244cc 4117
3e795de7
AD		 4118
4119/**
50539dd4 4120 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 4121 * @csw: console driver
4122 *
4123 * DESCRIPTION: All drivers that registers to the console layer must
4124 * call this function upon exit, or if the console driver is in a state
4125 * where it won't be able to handle console services, such as the
4126 * framebuffer console without loaded framebuffer drivers.
4127 *
4128 * The driver must unbind first prior to unregistration.
4129 */
e93a9a86
TI		 4130int do_unregister_con_driver(const struct consw *csw)
4131{
d9c660e7 4132 int i;
3e795de7
AD		 4133
4134 /* cannot unregister a bound driver */
4135 if (con_is_bound(csw))
d9c660e7
DV		 4136 return -EBUSY;
4137
4138 if (csw == conswitchp)
4139 return -EINVAL;
3e795de7
AD		 4140
4141 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4142 struct con_driver *con_driver = &registered_con_driver[i];
4143
2cf30f75 4144 if (con_driver->con == csw) {
d364b5c3
ID		 4145 /*
4146 * Defer the removal of the sysfs entries since that
4147 * will acquire the kernfs s_active lock and we can't
4148 * acquire this lock while holding the console lock:
4149 * the unbind sysfs entry imposes already the opposite
4150 * order. Reset con already here to prevent any later
4151 * lookup to succeed and mark this slot as zombie, so
4152 * it won't get reused until we complete the removal
4153 * in the deferred work.
4154 */
3e795de7 4155 con_driver->con = NULL;
d364b5c3
ID		 4156 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4157 schedule_work(&con_driver_unregister_work);
4158
d9c660e7 4159 return 0;
3e795de7
AD		 4160 }
4161 }
d9c660e7
DV		 4162
4163 return -ENODEV;
3e795de7 4164}
e93a9a86 4165EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4166
d364b5c3
ID		 4167static void con_driver_unregister_callback(struct work_struct *ignored)
4168{
4169 int i;
4170
4171 console_lock();
4172
4173 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4174 struct con_driver *con_driver = &registered_con_driver[i];
4175
4176 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4177 continue;
4178
4179 console_unlock();
4180
4181 vtconsole_deinit_device(con_driver);
4182 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4183
4184 console_lock();
4185
4186 if (WARN_ON_ONCE(con_driver->con))
4187 con_driver->con = NULL;
4188 con_driver->desc = NULL;
4189 con_driver->dev = NULL;
4190 con_driver->node = 0;
4191 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4192 con_driver->flag = 0;
4193 con_driver->first = 0;
4194 con_driver->last = 0;
4195 }
4196
4197 console_unlock();
4198}
4199
3e795de7
AD		 4200/*
4201 * If we support more console drivers, this function is used
4202 * when a driver wants to take over some existing consoles
4203 * and become default driver for newly opened ones.
4204 *
0095ab42 4205 * do_take_over_console is basically a register followed by bind
50e244cc
AC		 4206 */
4207int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4208{
4209 int err;
4210
4211 err = do_register_con_driver(csw, first, last);
4212 /*
4213 * If we get an busy error we still want to bind the console driver
4214 * and return success, as we may have unbound the console driver
4215 * but not unregistered it.
4216 */
4217 if (err == -EBUSY)
4218 err = 0;
4219 if (!err)
4220 do_bind_con_driver(csw, first, last, deflt);
4221
4222 return err;
4223}
4224EXPORT_SYMBOL_GPL(do_take_over_console);
4225
3e795de7
AD		 4226
4227/*
4228 * give_up_console is a wrapper to unregister_con_driver. It will only
4229 * work if driver is fully unbound.
4230 */
4231void give_up_console(const struct consw *csw)
4232{
70125e76
WY		 4233 console_lock();
4234 do_unregister_con_driver(csw);
4235 console_unlock();
3e795de7 4236}
921234d7 4237EXPORT_SYMBOL(give_up_console);
3e795de7 4238
6db4063c 4239static int __init vtconsole_class_init(void)
3e795de7 4240{
6db4063c 4241 int i;
3e795de7 4242
1aaba11d 4243 vtconsole_class = class_create("vtconsole");
6db4063c 4244 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4245 pr_warn("Unable to create vt console class; errno = %ld\n",
4246 PTR_ERR(vtconsole_class));
6db4063c
AD		 4247 vtconsole_class = NULL;
4248 }
3e795de7 4249
6db4063c 4250 /* Add system drivers to sysfs */
3e795de7
AD		 4251 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4252 struct con_driver *con = &registered_con_driver[i];
4253
805952a8 4254 if (con->con && !con->dev) {
1083a7be
TI		 4255 con->dev =
4256 device_create_with_groups(vtconsole_class, NULL,
4257 MKDEV(0, con->node),
4258 con, con_dev_groups,
4259 "vtcon%i", con->node);
6db4063c 4260
805952a8 4261 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4262 pr_warn("Unable to create device for %s; errno = %ld\n",
4263 con->desc, PTR_ERR(con->dev));
805952a8 4264 con->dev = NULL;
6db4063c 4265 } else {
805952a8 4266 vtconsole_init_device(con);
6db4063c 4267 }
3e795de7 4268 }
3e795de7
AD		 4269 }
4270
3e795de7
AD		 4271 return 0;
4272}
6db4063c 4273postcore_initcall(vtconsole_class_init);
3e795de7 4274
1da177e4
LT		 4275/*
4276 * Screen blanking
4277 */
4278
403aac96 4279static int set_vesa_blanking(char __user *p)
1da177e4 4280{
403aac96
YY		 4281 unsigned int mode;
4282
4283 if (get_user(mode, p + 1))
4284 return -EFAULT;
4285
4286 vesa_blank_mode = (mode < 4) ? mode : 0;
4287 return 0;
1da177e4
LT		 4288}
4289
1da177e4
LT		 4290void do_blank_screen(int entering_gfx)
4291{
4292 struct vc_data *vc = vc_cons[fg_console].d;
4293 int i;
4294
a135513c
DV		 4295 might_sleep();
4296
1da177e4
LT		 4297 WARN_CONSOLE_UNLOCKED();
4298
4299 if (console_blanked) {
4300 if (blank_state == blank_vesa_wait) {
4301 blank_state = blank_off;
d060a321 4302 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4303 }
4304 return;
4305 }
1da177e4
LT		 4306
4307 /* entering graphics mode? */
4308 if (entering_gfx) {
4309 hide_cursor(vc);
4310 save_screen(vc);
4311 vc->vc_sw->con_blank(vc, -1, 1);
4312 console_blanked = fg_console + 1;
b6e8f00f 4313 blank_state = blank_off;
1da177e4
LT		 4314 set_origin(vc);
4315 return;
4316 }
4317
b6e8f00f 4318 blank_state = blank_off;
4319
1da177e4
LT		 4320 /* don't blank graphics */
4321 if (vc->vc_mode != KD_TEXT) {
4322 console_blanked = fg_console + 1;
4323 return;
4324 }
4325
4326 hide_cursor(vc);
4327 del_timer_sync(&console_timer);
4328 blank_timer_expired = 0;
4329
4330 save_screen(vc);
4331 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4332 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4333 console_blanked = fg_console + 1;
4334 if (i)
4335 set_origin(vc);
4336
4337 if (console_blank_hook && console_blank_hook(1))
4338 return;
4339
d060a321 4340 if (vesa_off_interval && vesa_blank_mode) {
030babac 4341 blank_state = blank_vesa_wait;
1da177e4
LT		 4342 mod_timer(&console_timer, jiffies + vesa_off_interval);
4343 }
8b92e87d 4344 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4345}
4346EXPORT_SYMBOL(do_blank_screen);
4347
4348/*
4349 * Called by timer as well as from vt_console_driver
4350 */
4351void do_unblank_screen(int leaving_gfx)
4352{
4353 struct vc_data *vc;
4354
4355 /* This should now always be called from a "sane" (read: can schedule)
4356 * context for the sake of the low level drivers, except in the special
4357 * case of oops_in_progress
4358 */
4359 if (!oops_in_progress)
4360 might_sleep();
4361
4362 WARN_CONSOLE_UNLOCKED();
4363
4364 ignore_poke = 0;
4365 if (!console_blanked)
4366 return;
4367 if (!vc_cons_allocated(fg_console)) {
4368 /* impossible */
e620e548
JP		 4369 pr_warn("unblank_screen: tty %d not allocated ??\n",
4370 fg_console + 1);
1da177e4
LT		 4371 return;
4372 }
4373 vc = vc_cons[fg_console].d;
8d7fc299 4374 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4375 return; /* but leave console_blanked != 0 */
4376
4377 if (blankinterval) {
f324edc8 4378 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4379 blank_state = blank_normal_wait;
4380 }
4381
4382 console_blanked = 0;
8d7fc299 4383 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4384 /* Low-level driver cannot restore -> do it ourselves */
4385 update_screen(vc);
4386 if (console_blank_hook)
4387 console_blank_hook(0);
4388 set_palette(vc);
4389 set_cursor(vc);
8b92e87d 4390 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4391}
4392EXPORT_SYMBOL(do_unblank_screen);
4393
4394/*
4395 * This is called by the outside world to cause a forced unblank, mostly for
4396 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4397 * call it with 1 as an argument and so force a mode restore... that may kill
4398 * X or at least garbage the screen but would also make the Oops visible...
4399 */
0a64ce6e 4400static void unblank_screen(void)
1da177e4
LT		 4401{
4402 do_unblank_screen(0);
4403}
4404
4405/*
70522e12 4406 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4407 * (console operations can still happen at irq time, but only from printk which
70522e12 4408 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4409 */
24ed960a 4410static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4411{
4412 blank_timer_expired = 1;
4413 schedule_work(&console_work);
4414}
4415
4416void poke_blanked_console(void)
4417{
4418 WARN_CONSOLE_UNLOCKED();
4419
4420 /* Add this so we quickly catch whoever might call us in a non
4421 * safe context. Nowadays, unblank_screen() isn't to be called in
4422 * atomic contexts and is allowed to schedule (with the special case
4423 * of oops_in_progress, but that isn't of any concern for this
4424 * function. --BenH.
4425 */
4426 might_sleep();
4427
4428 /* This isn't perfectly race free, but a race here would be mostly harmless,
22fce66c 4429 * at worst, we'll do a spurious blank and it's unlikely
1da177e4
LT		 4430 */
4431 del_timer(&console_timer);
4432 blank_timer_expired = 0;
4433
4434 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4435 return;
4436 if (console_blanked)
4437 unblank_screen();
4438 else if (blankinterval) {
f324edc8 4439 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4440 blank_state = blank_normal_wait;
4441 }
4442}
4443
4444/*
4445 * Palettes
4446 */
4447
4448static void set_palette(struct vc_data *vc)
4449{
4450 WARN_CONSOLE_UNLOCKED();
4451
709280da 4452 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4453 vc->vc_sw->con_set_palette(vc, color_table);
4454}
4455
1da177e4
LT		 4456/*
4457 * Load palette into the DAC registers. arg points to a colour
4458 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4459 */
4460
4461int con_set_cmap(unsigned char __user *arg)
4462{
871bdea6
MG		 4463 int i, j, k;
4464 unsigned char colormap[3*16];
4465
4466 if (copy_from_user(colormap, arg, sizeof(colormap)))
4467 return -EFAULT;
1da177e4 4468
ac751efa 4469 console_lock();
871bdea6
MG		 4470 for (i = k = 0; i < 16; i++) {
4471 default_red[i] = colormap[k++];
4472 default_grn[i] = colormap[k++];
4473 default_blu[i] = colormap[k++];
4474 }
4475 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4476 if (!vc_cons_allocated(i))
4477 continue;
4478 for (j = k = 0; j < 16; j++) {
4479 vc_cons[i].d->vc_palette[k++] = default_red[j];
4480 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4481 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4482 }
4483 set_palette(vc_cons[i].d);
4484 }
ac751efa 4485 console_unlock();
1da177e4 4486
871bdea6 4487 return 0;
1da177e4
LT		 4488}
4489
4490int con_get_cmap(unsigned char __user *arg)
4491{
871bdea6
MG		 4492 int i, k;
4493 unsigned char colormap[3*16];
1da177e4 4494
ac751efa 4495 console_lock();
871bdea6
MG		 4496 for (i = k = 0; i < 16; i++) {
4497 colormap[k++] = default_red[i];
4498 colormap[k++] = default_grn[i];
4499 colormap[k++] = default_blu[i];
4500 }
ac751efa 4501 console_unlock();
1da177e4 4502
871bdea6
MG		 4503 if (copy_to_user(arg, colormap, sizeof(colormap)))
4504 return -EFAULT;
4505
4506 return 0;
1da177e4
LT		 4507}
4508
4509void reset_palette(struct vc_data *vc)
4510{
4511 int j, k;
4512 for (j=k=0; j<16; j++) {
4513 vc->vc_palette[k++] = default_red[j];
4514 vc->vc_palette[k++] = default_grn[j];
4515 vc->vc_palette[k++] = default_blu[j];
4516 }
4517 set_palette(vc);
4518}
4519
4520/*
4521 * Font switching
4522 *
05e2600c
ST		 4523 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4524 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4525 * (shorts/ints, depending on width) reserved for each character which is
4526 * kinda wasty, but this is done in order to maintain compatibility with the
4527 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4528 * into its favorite format (maybe we should add a `fontoffset' field to the
4529 * `display' structure so we won't have to convert the fontdata all the time.
1da177e4
LT		 4530 * /Jes
4531 */
4532
05e2600c
ST		 4533#define max_font_width 64
4534#define max_font_height 128
4535#define max_font_glyphs 512
4536#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
1da177e4
LT		 4537
4538static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4539{
4540 struct console_font font;
4541 int rc = -EINVAL;
4542 int c;
24d69384 4543 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
1da177e4 4544
18365ebf
ST		 4545 if (vpitch > max_font_height)
4546 return -EINVAL;
4547
1da177e4 4548 if (op->data) {
05e2600c 4549 font.data = kvmalloc(max_font_size, GFP_KERNEL);
1da177e4
LT		 4550 if (!font.data)
4551 return -ENOMEM;
4552 } else
4553 font.data = NULL;
4554
ac751efa 4555 console_lock();
edab558f
AC		 4556 if (vc->vc_mode != KD_TEXT)
4557 rc = -EINVAL;
4558 else if (vc->vc_sw->con_font_get)
24d69384 4559 rc = vc->vc_sw->con_font_get(vc, &font, vpitch);
1da177e4
LT		 4560 else
4561 rc = -ENOSYS;
ac751efa 4562 console_unlock();
1da177e4
LT		 4563
4564 if (rc)
4565 goto out;
4566
24d69384 4567 c = (font.width+7)/8 * vpitch * font.charcount;
04f378b1 4568
1da177e4
LT		 4569 if (op->data && font.charcount > op->charcount)
4570 rc = -ENOSPC;
ff2047fb
JS		 4571 if (font.width > op->width || font.height > op->height)
4572 rc = -ENOSPC;
1da177e4
LT		 4573 if (rc)
4574 goto out;
4575
4576 op->height = font.height;
4577 op->width = font.width;
4578 op->charcount = font.charcount;
4579
4580 if (op->data && copy_to_user(op->data, font.data, c))
4581 rc = -EFAULT;
4582
4583out:
05e2600c 4584 kvfree(font.data);
1da177e4
LT		 4585 return rc;
4586}
4587
4588static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4589{
4590 struct console_font font;
4591 int rc = -EINVAL;
4592 int size;
24d69384 4593 unsigned int vpitch = op->op == KD_FONT_OP_SET_TALL ? op->height : 32;
1da177e4
LT		 4594
4595 if (vc->vc_mode != KD_TEXT)
4596 return -EINVAL;
4597 if (!op->data)
4598 return -EINVAL;
05e2600c 4599 if (op->charcount > max_font_glyphs)
1da177e4 4600 return -EINVAL;
05e2600c
ST		 4601 if (op->width <= 0 || op->width > max_font_width || !op->height ||
4602 op->height > max_font_height)
8ffb8209 4603 return -EINVAL;
24d69384
ST		 4604 if (vpitch < op->height)
4605 return -EINVAL;
4606 size = (op->width+7)/8 * vpitch * op->charcount;
8ffb8209
MX		 4607 if (size > max_font_size)
4608 return -ENOSPC;
4609
4610 font.data = memdup_user(op->data, size);
4611 if (IS_ERR(font.data))
4612 return PTR_ERR(font.data);
4613
1da177e4 4614 font.charcount = op->charcount;
1da177e4 4615 font.width = op->width;
8ffb8209
MX		 4616 font.height = op->height;
4617
ac751efa 4618 console_lock();
edab558f
AC		 4619 if (vc->vc_mode != KD_TEXT)
4620 rc = -EINVAL;
566f9c9f
HD		 4621 else if (vc->vc_sw->con_font_set) {
4622 if (vc_is_sel(vc))
4623 clear_selection();
24d69384 4624 rc = vc->vc_sw->con_font_set(vc, &font, vpitch, op->flags);
566f9c9f 4625 } else
1da177e4 4626 rc = -ENOSYS;
ac751efa 4627 console_unlock();
1da177e4
LT		 4628 kfree(font.data);
4629 return rc;
4630}
4631
4632static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4633{
4634 struct console_font font = {.width = op->width, .height = op->height};
4635 char name[MAX_FONT_NAME];
4636 char *s = name;
4637 int rc;
4638
1da177e4
LT		 4639
4640 if (!op->data)
4641 s = NULL;
4642 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4643 return -EFAULT;
4644 else
4645 name[MAX_FONT_NAME - 1] = 0;
4646
ac751efa 4647 console_lock();
edab558f
AC		 4648 if (vc->vc_mode != KD_TEXT) {
4649 console_unlock();
4650 return -EINVAL;
4651 }
566f9c9f
HD		 4652 if (vc->vc_sw->con_font_default) {
4653 if (vc_is_sel(vc))
4654 clear_selection();
1da177e4 4655 rc = vc->vc_sw->con_font_default(vc, &font, s);
566f9c9f 4656 } else
1da177e4 4657 rc = -ENOSYS;
ac751efa 4658 console_unlock();
1da177e4
LT		 4659 if (!rc) {
4660 op->width = font.width;
4661 op->height = font.height;
4662 }
4663 return rc;
4664}
4665
1da177e4
LT		 4666int con_font_op(struct vc_data *vc, struct console_font_op *op)
4667{
4668 switch (op->op) {
4669 case KD_FONT_OP_SET:
24d69384 4670 case KD_FONT_OP_SET_TALL:
1da177e4
LT		 4671 return con_font_set(vc, op);
4672 case KD_FONT_OP_GET:
24d69384 4673 case KD_FONT_OP_GET_TALL:
1da177e4
LT		 4674 return con_font_get(vc, op);
4675 case KD_FONT_OP_SET_DEFAULT:
4676 return con_font_default(vc, op);
4677 case KD_FONT_OP_COPY:
3c4e0dff
DV		 4678 /* was buggy and never really used */
4679 return -EINVAL;
1da177e4
LT		 4680 }
4681 return -ENOSYS;
4682}
4683
4684/*
4685 * Interface exported to selection and vcs.
4686 */
4687
4688/* used by selection */
d73568c4 4689u16 screen_glyph(const struct vc_data *vc, int offset)
1da177e4 4690{
b8209f69 4691 u16 w = scr_readw(screenpos(vc, offset, true));
1da177e4
LT		 4692 u16 c = w & 0xff;
4693
4694 if (w & vc->vc_hi_font_mask)
4695 c |= 0x100;
4696 return c;
4697}
f7511d5f 4698EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4699
d73568c4 4700u32 screen_glyph_unicode(const struct vc_data *vc, int n)
9bfdc261 4701{
feb36abb
JSS		 4702 u32 **uni_lines = vc->vc_uni_lines;
4703
4704 if (uni_lines)
4705 return uni_lines[n / vc->vc_cols][n % vc->vc_cols];
9bfdc261 4706
d9ebb906 4707 return inverse_translate(vc, screen_glyph(vc, n * 2), true);
9bfdc261
AB		 4708}
4709EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4710
1da177e4 4711/* used by vcs - note the word offset */
b8209f69 4712unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
1da177e4
LT		 4713{
4714 return screenpos(vc, 2 * w_offset, viewed);
4715}
88867e3d 4716EXPORT_SYMBOL_GPL(screen_pos);
1da177e4 4717
a5c6bd80 4718void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
1da177e4 4719{
8a085494 4720 /* clamp values if they don't fit */
a5c6bd80
JS		 4721 xy[0] = min(vc->state.x, 0xFFu);
4722 xy[1] = min(vc->state.y, 0xFFu);
1da177e4
LT		 4723}
4724
a5c6bd80 4725void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
1da177e4 4726{
9477e260 4727 hide_cursor(vc);
a5c6bd80 4728 gotoxy(vc, xy[0], xy[1]);
1da177e4
LT		 4729 set_cursor(vc);
4730}
4731
d73568c4 4732u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
1da177e4
LT		 4733{
4734 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4735 return softcursor_original;
4736 return scr_readw(org);
4737}
4738
4739void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4740{
4741 scr_writew(val, org);
4742 if ((unsigned long)org == vc->vc_pos) {
4743 softcursor_original = -1;
4744 add_softcursor(vc);
4745 }
4746}
4747
432c9ed2
NP		 4748void vcs_scr_updated(struct vc_data *vc)
4749{
4750 notify_update(vc);
4751}
4752
35cc56f9
JS		 4753void vc_scrolldelta_helper(struct vc_data *c, int lines,
4754 unsigned int rolled_over, void *base, unsigned int size)
4755{
4756 unsigned long ubase = (unsigned long)base;
210fd746
JS		 4757 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4758 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4759 ptrdiff_t origin = (void *)c->vc_origin - base;
35cc56f9 4760 int margin = c->vc_size_row * 4;
7c918cdc 4761 int from, wrap, from_off, avail;
35cc56f9
JS		 4762
4763 /* Turn scrollback off */
4764 if (!lines) {
4765 c->vc_visible_origin = c->vc_origin;
4766 return;
4767 }
4768
4769 /* Do we have already enough to allow jumping from 0 to the end? */
210fd746 4770 if (rolled_over > scr_end + margin) {
7c918cdc
JS		 4771 from = scr_end;
4772 wrap = rolled_over + c->vc_size_row;
35cc56f9 4773 } else {
7c918cdc
JS		 4774 from = 0;
4775 wrap = size;
35cc56f9
JS		 4776 }
4777
7c918cdc
JS		 4778 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4779 avail = (origin - from + wrap) % wrap;
35cc56f9
JS		 4780
4781 /* Only a little piece would be left? Show all incl. the piece! */
7c918cdc 4782 if (avail < 2 * margin)
35cc56f9 4783 margin = 0;
7c918cdc
JS		 4784 if (from_off < margin)
4785 from_off = 0;
4786 if (from_off > avail - margin)
4787 from_off = avail;
35cc56f9 4788
7c918cdc 4789 c->vc_visible_origin = ubase + (from + from_off) % wrap;
35cc56f9
JS		 4790}
4791EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
Linux 6.x block layer and io_uring tree(s)