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serial: qcom-geni: drop bogus uart_write_wakeup()
[linux-2.6-block.git] / drivers / tty / vt / vt.c
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e3b3d0f5 1// SPDX-License-Identifier: GPL-2.0
1da177e4 2/*
1da177e4
LT		 3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 61 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
d4328b40
AT		 65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
3f07c014 76#include <linux/sched/signal.h>
1da177e4
LT		 77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
9a98e7a8 84#include <linux/vmalloc.h>
1da177e4
LT		 85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
c831c338 89#include <linux/mutex.h>
1da177e4
LT		 90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
1da177e4 97#include <linux/workqueue.h>
1da177e4
LT		 98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
b293d758 101#include <linux/notifier.h>
d81ed103
AC		 102#include <linux/device.h>
103#include <linux/io.h>
d81ed103 104#include <linux/uaccess.h>
81d44507 105#include <linux/kdb.h>
74c807ce 106#include <linux/ctype.h>
f0a8d84f 107#include <linux/bsearch.h>
d541ae4e 108#include <linux/gcd.h>
1da177e4 109
3e795de7 110#define MAX_NR_CON_DRIVER 16
1da177e4 111
6db4063c 112#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 115#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 116
117struct con_driver {
118 const struct consw *con;
119 const char *desc;
805952a8 120 struct device *dev;
6db4063c 121 int node;
3e795de7
AD		 122 int first;
123 int last;
124 int flag;
125};
126
127static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 128const struct consw *conswitchp;
129
1da177e4
LT		 130/*
131 * Here is the default bell parameters: 750HZ, 1/8th of a second
132 */
133#define DEFAULT_BELL_PITCH 750
134#define DEFAULT_BELL_DURATION (HZ/8)
bd63364c 135#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 136
1da177e4
LT		 137struct vc vc_cons [MAX_NR_CONSOLES];
138
139#ifndef VT_SINGLE_DRIVER
140static const struct consw *con_driver_map[MAX_NR_CONSOLES];
141#endif
142
143static int con_open(struct tty_struct *, struct file *);
144static void vc_init(struct vc_data *vc, unsigned int rows,
145 unsigned int cols, int do_clear);
146static void gotoxy(struct vc_data *vc, int new_x, int new_y);
147static void save_cur(struct vc_data *vc);
148static void reset_terminal(struct vc_data *vc, int do_clear);
149static void con_flush_chars(struct tty_struct *tty);
403aac96 150static int set_vesa_blanking(char __user *p);
1da177e4
LT		 151static void set_cursor(struct vc_data *vc);
152static void hide_cursor(struct vc_data *vc);
65f27f38 153static void console_callback(struct work_struct *ignored);
d364b5c3 154static void con_driver_unregister_callback(struct work_struct *ignored);
24ed960a 155static void blank_screen_t(struct timer_list *unused);
1da177e4 156static void set_palette(struct vc_data *vc);
0a64ce6e 157static void unblank_screen(void);
1da177e4 158
52c40fca
PH		 159#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
160
77bf2bab 161int default_utf8 = true;
042f10ec 162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 163int global_cursor_default = -1;
164module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 165
4dfa3c54 166static int cur_default = CUR_UNDERLINE;
9ea9a886
CL		 167module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
1da177e4
LT		 169/*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173static int ignore_poke;
174
175int do_poke_blanked_console;
176int console_blanked;
177
178static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 179static int vesa_off_interval;
a4199f5e 180static int blankinterval;
f324edc8 181core_param(consoleblank, blankinterval, int, 0444);
1da177e4 182
65f27f38 183static DECLARE_WORK(console_work, console_callback);
d364b5c3 184static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
b45cfba4 190 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 191 */
192int fg_console;
193int last_console;
194int want_console = -1;
fed891c8
JW		 195static int saved_fg_console;
196static int saved_last_console;
197static int saved_want_console;
198static int saved_vc_mode;
beed5336 199static int saved_console_blanked;
1da177e4
LT		 200
201/*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207static struct vc_data *master_display_fg;
208
209/*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216/*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219static int scrollback_delta;
220
221/*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225int (*console_blank_hook)(int);
226
1d27e3e2 227static DEFINE_TIMER(console_timer, blank_screen_t);
1da177e4
LT		 228static int blank_state;
229static int blank_timer_expired;
230enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234};
235
fbc92a34
KS		 236/*
237 * /sys/class/tty/tty0/
238 *
239 * the attribute 'active' contains the name of the current vc
240 * console and it supports poll() to detect vc switches
241 */
242static struct device *tty0dev;
243
b293d758
ST		 244/*
245 * Notifier list for console events.
246 */
247static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
248
249int register_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_register(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(register_vt_notifier);
254
255int unregister_vt_notifier(struct notifier_block *nb)
256{
257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
258}
259EXPORT_SYMBOL_GPL(unregister_vt_notifier);
260
261static void notify_write(struct vc_data *vc, unsigned int unicode)
262{
502fcb79 263 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
265}
266
267static void notify_update(struct vc_data *vc)
268{
269 struct vt_notifier_param param = { .vc = vc };
270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
271}
1da177e4
LT		 272/*
273 * Low-Level Functions
274 */
275
6ca8dfd7
JS		 276static inline bool con_is_fg(const struct vc_data *vc)
277{
278 return vc->vc_num == fg_console;
279}
280
281static inline bool con_should_update(const struct vc_data *vc)
282{
283 return con_is_visible(vc) && !console_blanked;
284}
1da177e4 285
d73568c4 286static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
b8209f69 287 bool viewed)
1da177e4
LT		 288{
289 unsigned short *p;
290
291 if (!viewed)
292 p = (unsigned short *)(vc->vc_origin + offset);
293 else if (!vc->vc_sw->con_screen_pos)
294 p = (unsigned short *)(vc->vc_visible_origin + offset);
295 else
296 p = vc->vc_sw->con_screen_pos(vc, offset);
297 return p;
298}
299
e33ac1c1 300/* Called from the keyboard irq path.. */
1da177e4
LT		 301static inline void scrolldelta(int lines)
302{
e33ac1c1
AC		 303 /* FIXME */
304 /* scrolldelta needs some kind of consistency lock, but the BKL was
305 and still is not protecting versus the scheduled back end */
1da177e4
LT		 306 scrollback_delta += lines;
307 schedule_console_callback();
308}
309
310void schedule_console_callback(void)
311{
312 schedule_work(&console_work);
313}
314
d8ae7242
NP		 315/*
316 * Code to manage unicode-based screen buffers
317 */
318
d8ae7242
NP		 319/*
320 * Our screen buffer is preceded by an array of line pointers so that
321 * scrolling only implies some pointer shuffling.
322 */
d8ae7242 323
feb36abb 324static u32 **vc_uniscr_alloc(unsigned int cols, unsigned int rows)
d8ae7242 325{
feb36abb 326 u32 **uni_lines;
d8ae7242 327 void *p;
feb36abb 328 unsigned int memsize, i, col_size = cols * sizeof(**uni_lines);
d8ae7242
NP		 329
330 /* allocate everything in one go */
4ba77bfb 331 memsize = col_size * rows;
feb36abb
JSS		 332 memsize += rows * sizeof(*uni_lines);
333 uni_lines = vzalloc(memsize);
334 if (!uni_lines)
d8ae7242
NP		 335 return NULL;
336
337 /* initial line pointers */
feb36abb 338 p = uni_lines + rows;
d8ae7242 339 for (i = 0; i < rows; i++) {
feb36abb 340 uni_lines[i] = p;
4ba77bfb 341 p += col_size;
d8ae7242 342 }
feb36abb
JSS		 343
344 return uni_lines;
d8ae7242
NP		 345}
346
feb36abb 347static void vc_uniscr_free(u32 **uni_lines)
57d38f26 348{
feb36abb 349 vfree(uni_lines);
57d38f26
NP		 350}
351
feb36abb 352static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)
d8ae7242 353{
feb36abb
JSS		 354 vc_uniscr_free(vc->vc_uni_lines);
355 vc->vc_uni_lines = new_uni_lines;
d8ae7242
NP		 356}
357
0c8414a6 358static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
d8ae7242 359{
287696d5
JSS		 360 if (vc->vc_uni_lines)
361 vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
d8ae7242
NP		 362}
363
364static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
365{
287696d5
JSS		 366 if (vc->vc_uni_lines) {
367 u32 *ln = vc->vc_uni_lines[vc->state.y];
28bc24fc 368 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 369
370 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
371 memset32(&ln[x], ' ', nr);
372 }
373}
374
375static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
376{
287696d5
JSS		 377 if (vc->vc_uni_lines) {
378 u32 *ln = vc->vc_uni_lines[vc->state.y];
28bc24fc 379 unsigned int x = vc->state.x, cols = vc->vc_cols;
d8ae7242
NP		 380
381 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
382 memset32(&ln[cols - nr], ' ', nr);
383 }
384}
385
386static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
387 unsigned int nr)
388{
287696d5
JSS		 389 if (vc->vc_uni_lines)
390 memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
d8ae7242
NP		 391}
392
393static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
394 unsigned int nr)
395{
287696d5 396 if (vc->vc_uni_lines)
d8ae7242 397 while (nr--)
287696d5 398 memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
d8ae7242
NP		 399}
400
8aad24ad
JSS		 401/* juggling array rotation algorithm (complexity O(N), size complexity O(1)) */
402static void juggle_array(u32 **array, unsigned int size, unsigned int nr)
403{
404 unsigned int gcd_idx;
405
406 for (gcd_idx = 0; gcd_idx < gcd(nr, size); gcd_idx++) {
407 u32 *gcd_idx_val = array[gcd_idx];
408 unsigned int dst_idx = gcd_idx;
409
410 while (1) {
411 unsigned int src_idx = (dst_idx + nr) % size;
412 if (src_idx == gcd_idx)
413 break;
414
415 array[dst_idx] = array[src_idx];
416 dst_idx = src_idx;
417 }
418
419 array[dst_idx] = gcd_idx_val;
420 }
421}
422
424c82af
JSS		 423static void vc_uniscr_scroll(struct vc_data *vc, unsigned int top,
424 unsigned int bottom, enum con_scroll dir,
425 unsigned int nr)
d8ae7242 426{
feb36abb 427 u32 **uni_lines = vc->vc_uni_lines;
424c82af 428 unsigned int size = bottom - top;
d8ae7242 429
287696d5
JSS		 430 if (!uni_lines)
431 return;
d541ae4e 432
287696d5 433 if (dir == SM_DOWN) {
8aad24ad 434 juggle_array(&uni_lines[top], size, size - nr);
424c82af 435 vc_uniscr_clear_lines(vc, top, nr);
8aad24ad
JSS		 436 } else {
437 juggle_array(&uni_lines[top], size, nr);
424c82af 438 vc_uniscr_clear_lines(vc, bottom - nr, nr);
287696d5 439 }
d8ae7242
NP		 440}
441
feb36abb 442static void vc_uniscr_copy_area(u32 **dst_lines,
d8ae7242
NP		 443 unsigned int dst_cols,
444 unsigned int dst_rows,
feb36abb 445 u32 **src_lines,
d8ae7242
NP		 446 unsigned int src_cols,
447 unsigned int src_top_row,
448 unsigned int src_bot_row)
449{
450 unsigned int dst_row = 0;
451
feb36abb 452 if (!dst_lines)
d8ae7242
NP		 453 return;
454
455 while (src_top_row < src_bot_row) {
feb36abb
JSS		 456 u32 *src_line = src_lines[src_top_row];
457 u32 *dst_line = dst_lines[dst_row];
d8ae7242 458
4ba77bfb 459 memcpy(dst_line, src_line, src_cols * sizeof(*src_line));
d8ae7242
NP		 460 if (dst_cols - src_cols)
461 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
462 src_top_row++;
463 dst_row++;
464 }
465 while (dst_row < dst_rows) {
feb36abb 466 u32 *dst_line = dst_lines[dst_row];
d8ae7242
NP		 467
468 memset32(dst_line, ' ', dst_cols);
469 dst_row++;
470 }
471}
472
d21b0be2
NP		 473/*
474 * Called from vcs_read() to make sure unicode screen retrieval is possible.
475 * This will initialize the unicode screen buffer if not already done.
476 * This returns 0 if OK, or a negative error code otherwise.
477 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
478 */
479int vc_uniscr_check(struct vc_data *vc)
480{
feb36abb 481 u32 **uni_lines;
d21b0be2
NP		 482 unsigned short *p;
483 int x, y, mask;
484
d21b0be2
NP		 485 WARN_CONSOLE_UNLOCKED();
486
487 if (!vc->vc_utf)
488 return -ENODATA;
489
feb36abb 490 if (vc->vc_uni_lines)
d21b0be2
NP		 491 return 0;
492
feb36abb
JSS		 493 uni_lines = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
494 if (!uni_lines)
d21b0be2
NP		 495 return -ENOMEM;
496
497 /*
498 * Let's populate it initially with (imperfect) reverse translation.
499 * This is the next best thing we can do short of having it enabled
500 * from the start even when no users rely on this functionality. True
501 * unicode content will be available after a complete screen refresh.
502 */
503 p = (unsigned short *)vc->vc_origin;
504 mask = vc->vc_hi_font_mask | 0xff;
505 for (y = 0; y < vc->vc_rows; y++) {
feb36abb 506 u32 *line = uni_lines[y];
d21b0be2
NP		 507 for (x = 0; x < vc->vc_cols; x++) {
508 u16 glyph = scr_readw(p++) & mask;
509 line[x] = inverse_translate(vc, glyph, true);
510 }
511 }
512
feb36abb
JSS		 513 vc->vc_uni_lines = uni_lines;
514
d21b0be2
NP		 515 return 0;
516}
517
518/*
519 * Called from vcs_read() to get the unicode data from the screen.
520 * This must be preceded by a successful call to vc_uniscr_check() once
521 * the console lock has been taken.
522 */
b8209f69 523void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
d21b0be2
NP		 524 unsigned int row, unsigned int col, unsigned int nr)
525{
feb36abb 526 u32 **uni_lines = vc->vc_uni_lines;
708d0bff
NP		 527 int offset = row * vc->vc_size_row + col * 2;
528 unsigned long pos;
d21b0be2 529
441c9381
JSS		 530 if (WARN_ON_ONCE(!uni_lines))
531 return;
708d0bff
NP		 532
533 pos = (unsigned long)screenpos(vc, offset, viewed);
534 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
535 /*
536 * Desired position falls in the main screen buffer.
537 * However the actual row/col might be different if
538 * scrollback is active.
539 */
540 row = (pos - vc->vc_origin) / vc->vc_size_row;
541 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
feb36abb 542 memcpy(dest, &uni_lines[row][col], nr * sizeof(u32));
708d0bff
NP		 543 } else {
544 /*
545 * Scrollback is active. For now let's simply backtranslate
546 * the screen glyphs until the unicode screen buffer does
547 * synchronize with console display drivers for a scrollback
548 * buffer of its own.
549 */
550 u16 *p = (u16 *)pos;
551 int mask = vc->vc_hi_font_mask | 0xff;
0c8414a6 552 u32 *uni_buf = dest;
708d0bff
NP		 553 while (nr--) {
554 u16 glyph = scr_readw(p++) & mask;
555 *uni_buf++ = inverse_translate(vc, glyph, true);
556 }
557 }
d21b0be2
NP		 558}
559
424c82af
JSS		 560static void con_scroll(struct vc_data *vc, unsigned int top,
561 unsigned int bottom, enum con_scroll dir,
562 unsigned int nr)
1da177e4 563{
bf8baa00 564 unsigned int rows = bottom - top;
424c82af 565 u16 *clear, *dst, *src;
1da177e4 566
424c82af 567 if (top + nr >= bottom)
bf8baa00 568 nr = rows - 1;
424c82af 569 if (bottom > vc->vc_rows || top >= bottom || nr < 1)
1da177e4 570 return;
424c82af
JSS		 571
572 vc_uniscr_scroll(vc, top, bottom, dir, nr);
573 if (con_is_visible(vc) &&
574 vc->vc_sw->con_scroll(vc, top, bottom, dir, nr))
1da177e4 575 return;
1da177e4 576
424c82af
JSS		 577 src = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * top);
578 dst = (u16 *)(vc->vc_origin + vc->vc_size_row * (top + nr));
1da177e4 579
89765b94 580 if (dir == SM_UP) {
bf8baa00 581 clear = src + (rows - nr) * vc->vc_cols;
424c82af 582 swap(src, dst);
89765b94 583 }
bf8baa00 584 scr_memmovew(dst, src, (rows - nr) * vc->vc_size_row);
89765b94 585 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
1da177e4
LT		 586}
587
588static void do_update_region(struct vc_data *vc, unsigned long start, int count)
589{
1da177e4
LT		 590 unsigned int xx, yy, offset;
591 u16 *p;
592
593 p = (u16 *) start;
594 if (!vc->vc_sw->con_getxy) {
595 offset = (start - vc->vc_origin) / 2;
596 xx = offset % vc->vc_cols;
597 yy = offset / vc->vc_cols;
598 } else {
599 int nxx, nyy;
600 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
601 xx = nxx; yy = nyy;
602 }
603 for(;;) {
604 u16 attrib = scr_readw(p) & 0xff00;
605 int startx = xx;
606 u16 *q = p;
607 while (xx < vc->vc_cols && count) {
608 if (attrib != (scr_readw(p) & 0xff00)) {
609 if (p > q)
610 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
611 startx = xx;
612 q = p;
613 attrib = scr_readw(p) & 0xff00;
614 }
615 p++;
616 xx++;
617 count--;
618 }
619 if (p > q)
620 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
621 if (!count)
622 break;
623 xx = 0;
624 yy++;
625 if (vc->vc_sw->con_getxy) {
626 p = (u16 *)start;
627 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
628 }
629 }
1da177e4
LT		 630}
631
632void update_region(struct vc_data *vc, unsigned long start, int count)
633{
634 WARN_CONSOLE_UNLOCKED();
635
6ca8dfd7 636 if (con_should_update(vc)) {
1da177e4
LT		 637 hide_cursor(vc);
638 do_update_region(vc, start, count);
639 set_cursor(vc);
640 }
641}
642
643/* Structure of attributes is hardware-dependent */
644
b84ae3dc 645static u8 build_attr(struct vc_data *vc, u8 _color,
77bc14f2
JS		 646 enum vc_intensity _intensity, bool _blink, bool _underline,
647 bool _reverse, bool _italic)
1da177e4
LT		 648{
649 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 650 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
651 _blink, _underline, _reverse, _italic);
1da177e4 652
1da177e4
LT		 653/*
654 * ++roman: I completely changed the attribute format for monochrome
655 * mode (!can_do_color). The formerly used MDA (monochrome display
656 * adapter) format didn't allow the combination of certain effects.
657 * Now the attribute is just a bit vector:
658 * Bit 0..1: intensity (0..2)
659 * Bit 2 : underline
660 * Bit 3 : reverse
661 * Bit 7 : blink
662 */
663 {
c9e587ab 664 u8 a = _color;
1da177e4
LT		 665 if (!vc->vc_can_do_color)
666 return _intensity |
c5c717e7
JS		 667 (_italic << 1) |
668 (_underline << 2) |
669 (_reverse << 3) |
670 (_blink << 7);
fa6ce9ab
JE		 671 if (_italic)
672 a = (a & 0xF0) | vc->vc_itcolor;
673 else if (_underline)
1da177e4 674 a = (a & 0xf0) | vc->vc_ulcolor;
b84ae3dc 675 else if (_intensity == VCI_HALF_BRIGHT)
1c65a879 676 a = (a & 0xf0) | vc->vc_halfcolor;
1da177e4 677 if (_reverse)
faace51b 678 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
1da177e4
LT		 679 if (_blink)
680 a ^= 0x80;
b84ae3dc 681 if (_intensity == VCI_BOLD)
1da177e4
LT		 682 a ^= 0x08;
683 if (vc->vc_hi_font_mask == 0x100)
684 a <<= 1;
685 return a;
686 }
1da177e4
LT		 687}
688
689static void update_attr(struct vc_data *vc)
690{
28bc24fc
JS		 691 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
692 vc->state.blink, vc->state.underline,
693 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
b84ae3dc 694 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
77bc14f2
JS		 695 VCI_NORMAL, vc->state.blink, false,
696 vc->vc_decscnm, false) << 8);
1da177e4
LT		 697}
698
699/* Note: inverting the screen twice should revert to the original state */
b8209f69 700void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
1da177e4
LT		 701{
702 unsigned short *p;
703
704 WARN_CONSOLE_UNLOCKED();
705
706 count /= 2;
707 p = screenpos(vc, offset, viewed);
6af39ed3 708 if (vc->vc_sw->con_invert_region) {
1da177e4 709 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 710 } else {
1da177e4
LT		 711 u16 *q = p;
712 int cnt = count;
713 u16 a;
714
715 if (!vc->vc_can_do_color) {
716 while (cnt--) {
717 a = scr_readw(q);
718 a ^= 0x0800;
719 scr_writew(a, q);
720 q++;
721 }
722 } else if (vc->vc_hi_font_mask == 0x100) {
723 while (cnt--) {
724 a = scr_readw(q);
faace51b
JS		 725 a = (a & 0x11ff) |
726 ((a & 0xe000) >> 4) |
727 ((a & 0x0e00) << 4);
1da177e4
LT		 728 scr_writew(a, q);
729 q++;
730 }
731 } else {
732 while (cnt--) {
733 a = scr_readw(q);
faace51b
JS		 734 a = (a & 0x88ff) |
735 ((a & 0x7000) >> 4) |
736 ((a & 0x0700) << 4);
1da177e4
LT		 737 scr_writew(a, q);
738 q++;
739 }
740 }
741 }
6af39ed3 742
6ca8dfd7 743 if (con_should_update(vc))
1da177e4 744 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 745 notify_update(vc);
1da177e4
LT		 746}
747
748/* used by selection: complement pointer position */
749void complement_pos(struct vc_data *vc, int offset)
750{
414edcd3 751 static int old_offset = -1;
1da177e4
LT		 752 static unsigned short old;
753 static unsigned short oldx, oldy;
754
755 WARN_CONSOLE_UNLOCKED();
756
414edcd3
AD		 757 if (old_offset != -1 && old_offset >= 0 &&
758 old_offset < vc->vc_screenbuf_size) {
b8209f69 759 scr_writew(old, screenpos(vc, old_offset, true));
6ca8dfd7 760 if (con_should_update(vc))
1da177e4 761 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 762 notify_update(vc);
1da177e4 763 }
414edcd3
AD		 764
765 old_offset = offset;
766
767 if (offset != -1 && offset >= 0 &&
768 offset < vc->vc_screenbuf_size) {
1da177e4 769 unsigned short new;
414edcd3 770 unsigned short *p;
b8209f69 771 p = screenpos(vc, offset, true);
1da177e4
LT		 772 old = scr_readw(p);
773 new = old ^ vc->vc_complement_mask;
774 scr_writew(new, p);
6ca8dfd7 775 if (con_should_update(vc)) {
1da177e4
LT		 776 oldx = (offset >> 1) % vc->vc_cols;
777 oldy = (offset >> 1) / vc->vc_cols;
778 vc->vc_sw->con_putc(vc, new, oldy, oldx);
779 }
19e3ae6b 780 notify_update(vc);
1da177e4
LT		 781 }
782}
783
784static void insert_char(struct vc_data *vc, unsigned int nr)
785{
81732c3b 786 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 787
d8ae7242 788 vc_uniscr_insert(vc, nr);
28bc24fc 789 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
81732c3b 790 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 791 vc->vc_need_wrap = 0;
6ca8dfd7 792 if (con_should_update(vc))
81732c3b 793 do_update_region(vc, (unsigned long) p,
28bc24fc 794 vc->vc_cols - vc->state.x);
1da177e4
LT		 795}
796
797static void delete_char(struct vc_data *vc, unsigned int nr)
798{
81732c3b 799 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 800
d8ae7242 801 vc_uniscr_delete(vc, nr);
39cdb68c 802 scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
28bc24fc 803 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
81732c3b 804 nr * 2);
1da177e4 805 vc->vc_need_wrap = 0;
6ca8dfd7 806 if (con_should_update(vc))
81732c3b 807 do_update_region(vc, (unsigned long) p,
28bc24fc 808 vc->vc_cols - vc->state.x);
1da177e4
LT		 809}
810
e882f715 811static int softcursor_original = -1;
1da177e4
LT		 812
813static void add_softcursor(struct vc_data *vc)
814{
815 int i = scr_readw((u16 *) vc->vc_pos);
816 u32 type = vc->vc_cursor_type;
817
c0e4b3ad 818 if (!(type & CUR_SW))
dc219db6
JS		 819 return;
820 if (softcursor_original != -1)
821 return;
1da177e4 822 softcursor_original = i;
c0e4b3ad
JS		 823 i |= CUR_SET(type);
824 i ^= CUR_CHANGE(type);
825 if ((type & CUR_ALWAYS_BG) &&
826 (softcursor_original & CUR_BG) == (i & CUR_BG))
827 i ^= CUR_BG;
828 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
829 i ^= CUR_FG;
dc219db6 830 scr_writew(i, (u16 *)vc->vc_pos);
6ca8dfd7 831 if (con_should_update(vc))
28bc24fc 832 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
1da177e4
LT		 833}
834
835static void hide_softcursor(struct vc_data *vc)
836{
837 if (softcursor_original != -1) {
838 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 839 if (con_should_update(vc))
1da177e4 840 vc->vc_sw->con_putc(vc, softcursor_original,
28bc24fc 841 vc->state.y, vc->state.x);
1da177e4
LT		 842 softcursor_original = -1;
843 }
844}
845
846static void hide_cursor(struct vc_data *vc)
847{
dce05aa6 848 if (vc_is_sel(vc))
1da177e4 849 clear_selection();
dce05aa6 850
1da177e4
LT		 851 vc->vc_sw->con_cursor(vc, CM_ERASE);
852 hide_softcursor(vc);
853}
854
855static void set_cursor(struct vc_data *vc)
856{
6ca8dfd7 857 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 858 return;
859 if (vc->vc_deccm) {
dce05aa6 860 if (vc_is_sel(vc))
1da177e4
LT		 861 clear_selection();
862 add_softcursor(vc);
c0e4b3ad 863 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
1da177e4
LT		 864 vc->vc_sw->con_cursor(vc, CM_DRAW);
865 } else
866 hide_cursor(vc);
867}
868
869static void set_origin(struct vc_data *vc)
870{
871 WARN_CONSOLE_UNLOCKED();
872
6ca8dfd7 873 if (!con_is_visible(vc) ||
1da177e4
LT		 874 !vc->vc_sw->con_set_origin ||
875 !vc->vc_sw->con_set_origin(vc))
876 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
877 vc->vc_visible_origin = vc->vc_origin;
878 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
28bc24fc
JS		 879 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
880 2 * vc->state.x;
1da177e4
LT		 881}
882
c0f160a7 883static void save_screen(struct vc_data *vc)
1da177e4
LT		 884{
885 WARN_CONSOLE_UNLOCKED();
886
887 if (vc->vc_sw->con_save_screen)
888 vc->vc_sw->con_save_screen(vc);
889}
890
bcd375f7
MS		 891static void flush_scrollback(struct vc_data *vc)
892{
893 WARN_CONSOLE_UNLOCKED();
894
a6dbe442 895 set_origin(vc);
3f4ef485 896 if (vc->vc_sw->con_flush_scrollback) {
bcd375f7 897 vc->vc_sw->con_flush_scrollback(vc);
3f4ef485
NP		 898 } else if (con_is_visible(vc)) {
899 /*
900 * When no con_flush_scrollback method is provided then the
901 * legacy way for flushing the scrollback buffer is to use
902 * a side effect of the con_switch method. We do it only on
903 * the foreground console as background consoles have no
904 * scrollback buffers in that case and we obviously don't
905 * want to switch to them.
906 */
907 hide_cursor(vc);
a6dbe442 908 vc->vc_sw->con_switch(vc);
3f4ef485
NP		 909 set_cursor(vc);
910 }
bcd375f7
MS		 911}
912
1da177e4
LT		 913/*
914 * Redrawing of screen
915 */
916
2a248307 917void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 918{
919 unsigned short *p = (unsigned short *)vc->vc_origin;
920 int count = vc->vc_screenbuf_size / 2;
921 int mask = vc->vc_hi_font_mask | 0xff;
922
923 for (; count > 0; count--, p++) {
924 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
925 }
926}
927
928void redraw_screen(struct vc_data *vc, int is_switch)
929{
930 int redraw = 0;
931
932 WARN_CONSOLE_UNLOCKED();
933
934 if (!vc) {
935 /* strange ... */
936 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
937 return;
938 }
939
940 if (is_switch) {
941 struct vc_data *old_vc = vc_cons[fg_console].d;
942 if (old_vc == vc)
943 return;
6ca8dfd7 944 if (!con_is_visible(vc))
1da177e4
LT		 945 redraw = 1;
946 *vc->vc_display_fg = vc;
947 fg_console = vc->vc_num;
948 hide_cursor(old_vc);
6ca8dfd7 949 if (!con_is_visible(old_vc)) {
1da177e4
LT		 950 save_screen(old_vc);
951 set_origin(old_vc);
952 }
fbc92a34
KS		 953 if (tty0dev)
954 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 955 } else {
956 hide_cursor(vc);
957 redraw = 1;
958 }
959
960 if (redraw) {
961 int update;
962 int old_was_color = vc->vc_can_do_color;
963
964 set_origin(vc);
965 update = vc->vc_sw->con_switch(vc);
966 set_palette(vc);
967 /*
968 * If console changed from mono<->color, the best we can do
969 * is to clear the buffer attributes. As it currently stands,
970 * rebuilding new attributes from the old buffer is not doable
971 * without overly complex code.
972 */
973 if (old_was_color != vc->vc_can_do_color) {
974 update_attr(vc);
975 clear_buffer_attributes(vc);
976 }
8fd4bd22 977
8d7fc299 978 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 979 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
980 }
981 set_cursor(vc);
982 if (is_switch) {
63f24a7f 983 vt_set_leds_compute_shiftstate();
8182ec49 984 notify_update(vc);
1da177e4
LT		 985 }
986}
987
988/*
989 * Allocation, freeing and resizing of VTs.
990 */
991
992int vc_cons_allocated(unsigned int i)
993{
994 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
995}
996
997static void visual_init(struct vc_data *vc, int num, int init)
998{
999 /* ++Geert: vc->vc_sw->con_init determines console size */
1000 if (vc->vc_sw)
1001 module_put(vc->vc_sw->owner);
1002 vc->vc_sw = conswitchp;
1003#ifndef VT_SINGLE_DRIVER
1004 if (con_driver_map[num])
1005 vc->vc_sw = con_driver_map[num];
1006#endif
1007 __module_get(vc->vc_sw->owner);
1008 vc->vc_num = num;
1009 vc->vc_display_fg = &master_display_fg;
8da443b1 1010 if (vc->uni_pagedict_loc)
08b33249 1011 con_free_unimap(vc);
8da443b1
JS		 1012 vc->uni_pagedict_loc = &vc->uni_pagedict;
1013 vc->uni_pagedict = NULL;
1da177e4
LT		 1014 vc->vc_hi_font_mask = 0;
1015 vc->vc_complement_mask = 0;
1016 vc->vc_can_do_color = 0;
1b45996d 1017 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1018 vc->vc_sw->con_init(vc, init);
1019 if (!vc->vc_complement_mask)
1020 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1021 vc->vc_s_complement_mask = vc->vc_complement_mask;
1022 vc->vc_size_row = vc->vc_cols << 1;
1023 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1024}
1025
a1ad1cc9
GH		 1026
1027static void visual_deinit(struct vc_data *vc)
1028{
1029 vc->vc_sw->con_deinit(vc);
1030 module_put(vc->vc_sw->owner);
1031}
1032
ca4463bf
EB		 1033static void vc_port_destruct(struct tty_port *port)
1034{
1035 struct vc_data *vc = container_of(port, struct vc_data, port);
1036
1037 kfree(vc);
1038}
1039
1040static const struct tty_port_operations vc_port_ops = {
1041 .destruct = vc_port_destruct,
1042};
1043
ce684552
TH		 1044/*
1045 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1046 * [this is to be used together with some user program
1047 * like resize that changes the hardware videomode]
1048 */
1049#define VC_MAXCOL (32767)
1050#define VC_MAXROW (32767)
1051
1da177e4
LT		 1052int vc_allocate(unsigned int currcons) /* return 0 on success */
1053{
34902b7f
JS		 1054 struct vt_notifier_param param;
1055 struct vc_data *vc;
ce684552 1056 int err;
34902b7f 1057
1da177e4
LT		 1058 WARN_CONSOLE_UNLOCKED();
1059
1060 if (currcons >= MAX_NR_CONSOLES)
1061 return -ENXIO;
34902b7f
JS		 1062
1063 if (vc_cons[currcons].d)
1064 return 0;
1065
1066 /* due to the granularity of kmalloc, we waste some memory here */
1067 /* the alloc is done in two steps, to optimize the common situation
1068 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1069 /* although the numbers above are not valid since long ago, the
1070 point is still up-to-date and the comment still has its value
1071 even if only as a historical artifact. --mj, July 1998 */
1072 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1073 if (!vc)
1da177e4 1074 return -ENOMEM;
34902b7f
JS		 1075
1076 vc_cons[currcons].d = vc;
1077 tty_port_init(&vc->port);
ca4463bf 1078 vc->port.ops = &vc_port_ops;
34902b7f
JS		 1079 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1080
1081 visual_init(vc, currcons, 1);
1082
8da443b1 1083 if (!*vc->uni_pagedict_loc)
1da177e4 1084 con_set_default_unimap(vc);
f6c06b68 1085
ce684552
TH		 1086 err = -EINVAL;
1087 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1088 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1089 goto err_free;
1090 err = -ENOMEM;
21eff69a 1091 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1092 if (!vc->vc_screenbuf)
1093 goto err_free;
1094
1095 /* If no drivers have overridden us and the user didn't pass a
1096 boot option, default to displaying the cursor */
1097 if (global_cursor_default == -1)
1098 global_cursor_default = 1;
1099
1100 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1101 vcs_make_sysfs(currcons);
1102 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1103
1da177e4 1104 return 0;
34902b7f 1105err_free:
a1ad1cc9 1106 visual_deinit(vc);
34902b7f
JS		 1107 kfree(vc);
1108 vc_cons[currcons].d = NULL;
ce684552 1109 return err;
1da177e4
LT		 1110}
1111
e400b6ec
AD		 1112static inline int resize_screen(struct vc_data *vc, int width, int height,
1113 int user)
1da177e4
LT		 1114{
1115 /* Resizes the resolution of the display adapater */
1116 int err = 0;
1117
ffb324e6 1118 if (vc->vc_sw->con_resize)
e400b6ec
AD		 1119 err = vc->vc_sw->con_resize(vc, width, height, user);
1120
1da177e4
LT		 1121 return err;
1122}
1123
8c9a9dd0
AC		 1124/**
1125 * vc_do_resize - resizing method for the tty
1126 * @tty: tty being resized
8c9a9dd0
AC		 1127 * @vc: virtual console private data
1128 * @cols: columns
1129 * @lines: lines
1130 *
1131 * Resize a virtual console, clipping according to the actual constraints.
1132 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1133 * information and perform any necessary signal handling.
8c9a9dd0 1134 *
6a1c0680 1135 * Caller must hold the console semaphore. Takes the termios rwsem and
64d608db 1136 * ctrl.lock of the tty IFF a tty is passed.
8c9a9dd0
AC		 1137 */
1138
fc6f6238
AC		 1139static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1140 unsigned int cols, unsigned int lines)
1da177e4
LT		 1141{
1142 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1143 unsigned long end;
d8ae7242 1144 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1145 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1146 unsigned int user;
f8d1653d 1147 unsigned short *oldscreen, *newscreen;
feb36abb 1148 u32 **new_uniscr = NULL;
1da177e4
LT		 1149
1150 WARN_CONSOLE_UNLOCKED();
1151
1152 if (!vc)
1153 return -ENXIO;
1154
e400b6ec
AD		 1155 user = vc->vc_resize_user;
1156 vc->vc_resize_user = 0;
1157
ce684552 1158 if (cols > VC_MAXCOL || lines > VC_MAXROW)
1da177e4
LT		 1159 return -EINVAL;
1160
1161 new_cols = (cols ? cols : vc->vc_cols);
1162 new_rows = (lines ? lines : vc->vc_rows);
1163 new_row_size = new_cols << 1;
1164 new_screen_size = new_row_size * new_rows;
1165
3b0c4061
IMAT		 1166 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1167 /*
1168 * This function is being called here to cover the case
1169 * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1170 * passing the same fb_var_screeninfo containing the fields
1171 * yres/xres equal to a number non-multiple of vc_font.height
1172 * and yres_virtual/xres_virtual equal to number lesser than the
1173 * vc_font.height and yres/xres.
1174 * In the second call, the struct fb_var_screeninfo isn't
1175 * being modified by the underlying driver because of the
1176 * if above, and this causes the fbcon_display->vrows to become
1177 * negative and it eventually leads to out-of-bound
1178 * access by the imageblit function.
1179 * To give the correct values to the struct and to not have
1180 * to deal with possible errors from the code below, we call
1181 * the resize_screen here as well.
1182 */
1183 return resize_screen(vc, new_cols, new_rows, user);
1184 }
1da177e4 1185
ce684552 1186 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
32b2921e 1187 return -EINVAL;
21eff69a 1188 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1189 if (!newscreen)
1190 return -ENOMEM;
1191
feb36abb 1192 if (vc->vc_uni_lines) {
d8ae7242
NP		 1193 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1194 if (!new_uniscr) {
1195 kfree(newscreen);
1196 return -ENOMEM;
1197 }
1198 }
1199
dce05aa6 1200 if (vc_is_sel(vc))
009e39ae
SD		 1201 clear_selection();
1202
1da177e4 1203 old_rows = vc->vc_rows;
1da177e4 1204 old_row_size = vc->vc_size_row;
1da177e4 1205
e400b6ec 1206 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1207 if (err) {
1208 kfree(newscreen);
57d38f26 1209 vc_uniscr_free(new_uniscr);
1da177e4
LT		 1210 return err;
1211 }
1212
1213 vc->vc_rows = new_rows;
1214 vc->vc_cols = new_cols;
1215 vc->vc_size_row = new_row_size;
1216 vc->vc_screenbuf_size = new_screen_size;
1217
1218 rlth = min(old_row_size, new_row_size);
1219 rrem = new_row_size - rlth;
1220 old_origin = vc->vc_origin;
1221 new_origin = (long) newscreen;
1222 new_scr_end = new_origin + new_screen_size;
3b41dc1a 1223
28bc24fc
JS		 1224 if (vc->state.y > new_rows) {
1225 if (old_rows - vc->state.y < new_rows) {
3b41dc1a
AD		 1226 /*
1227 * Cursor near the bottom, copy contents from the
1228 * bottom of buffer
1229 */
d8ae7242 1230 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1231 } else {
1232 /*
1233 * Cursor is in no man's land, copy 1/2 screenful
1234 * from the top and bottom of cursor position
1235 */
28bc24fc 1236 first_copied_row = (vc->state.y - new_rows/2);
3b41dc1a 1237 }
d8ae7242
NP		 1238 old_origin += first_copied_row * old_row_size;
1239 } else
1240 first_copied_row = 0;
9fc2b2d0 1241 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1242
d8ae7242 1243 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
feb36abb 1244 vc->vc_uni_lines, rlth/2, first_copied_row,
d8ae7242
NP		 1245 min(old_rows, new_rows));
1246 vc_uniscr_set(vc, new_uniscr);
1247
1da177e4
LT		 1248 update_attr(vc);
1249
3b41dc1a
AD		 1250 while (old_origin < end) {
1251 scr_memcpyw((unsigned short *) new_origin,
1252 (unsigned short *) old_origin, rlth);
1da177e4 1253 if (rrem)
3b41dc1a
AD		 1254 scr_memsetw((void *)(new_origin + rlth),
1255 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1256 old_origin += old_row_size;
1257 new_origin += new_row_size;
1258 }
1259 if (new_scr_end > new_origin)
3b41dc1a
AD		 1260 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1261 new_scr_end - new_origin);
f8d1653d 1262 oldscreen = vc->vc_screenbuf;
1da177e4 1263 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1264 vc->vc_screenbuf_size = new_screen_size;
1265 set_origin(vc);
f8d1653d 1266 kfree(oldscreen);
1da177e4
LT		 1267
1268 /* do part of a reset_terminal() */
1269 vc->vc_top = 0;
1270 vc->vc_bottom = vc->vc_rows;
28bc24fc 1271 gotoxy(vc, vc->state.x, vc->state.y);
1da177e4
LT		 1272 save_cur(vc);
1273
8c9a9dd0
AC		 1274 if (tty) {
1275 /* Rewrite the requested winsize data with the actual
1276 resulting sizes */
1277 struct winsize ws;
1da177e4
LT		 1278 memset(&ws, 0, sizeof(ws));
1279 ws.ws_row = vc->vc_rows;
1280 ws.ws_col = vc->vc_cols;
1281 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1282 tty_do_resize(tty, &ws);
1da177e4
LT		 1283 }
1284
6ca8dfd7 1285 if (con_is_visible(vc))
1da177e4 1286 update_screen(vc);
8b92e87d 1287 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1288 notify_update(vc);
1da177e4
LT		 1289 return err;
1290}
1291
8c9a9dd0
AC		 1292/**
1293 * vc_resize - resize a VT
1294 * @vc: virtual console
1295 * @cols: columns
1296 * @rows: rows
1297 *
1298 * Resize a virtual console as seen from the console end of things. We
1299 * use the common vc_do_resize methods to update the structures. The
1300 * caller must hold the console sem to protect console internals and
8ce73264 1301 * vc->port.tty
8c9a9dd0
AC		 1302 */
1303
1304int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1305{
8ce73264 1306 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 1307}
1308
1309/**
1310 * vt_resize - resize a VT
1311 * @tty: tty to resize
8c9a9dd0
AC		 1312 * @ws: winsize attributes
1313 *
1314 * Resize a virtual terminal. This is called by the tty layer as we
1315 * register our own handler for resizing. The mutual helper does all
1316 * the actual work.
1317 *
1318 * Takes the console sem and the called methods then take the tty
64d608db 1319 * termios_rwsem and the tty ctrl.lock in that order.
8c9a9dd0 1320 */
da2bdf9a 1321static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1322{
8c9a9dd0
AC		 1323 struct vc_data *vc = tty->driver_data;
1324 int ret;
ca9bda00 1325
ac751efa 1326 console_lock();
fc6f6238 1327 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1328 console_unlock();
8c9a9dd0 1329 return ret;
ca9bda00 1330}
1da177e4 1331
421b40a6 1332struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1333{
421b40a6
PH		 1334 struct vc_data *vc = NULL;
1335
1da177e4
LT		 1336 WARN_CONSOLE_UNLOCKED();
1337
1338 if (vc_cons_allocated(currcons)) {
421b40a6 1339 struct vt_notifier_param param;
4995f8ef 1340
421b40a6 1341 param.vc = vc = vc_cons[currcons].d;
b293d758 1342 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1343 vcs_remove_sysfs(currcons);
a1ad1cc9 1344 visual_deinit(vc);
211b4d42 1345 con_free_unimap(vc);
bde0d2c9 1346 put_pid(vc->vt_pid);
d8ae7242 1347 vc_uniscr_set(vc, NULL);
5c9228f0 1348 kfree(vc->vc_screenbuf);
1da177e4
LT		 1349 vc_cons[currcons].d = NULL;
1350 }
421b40a6 1351 return vc;
1da177e4
LT		 1352}
1353
1354/*
1355 * VT102 emulator
1356 */
1357
2ff5c5a1
MH		 1358enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1359
079c9534
AC		 1360#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1361#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1362#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1363
1364#define decarm VC_REPEAT
1365#define decckm VC_CKMODE
1366#define kbdapplic VC_APPLIC
1367#define lnm VC_CRLF
1368
8ede5cce 1369const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1370 8,12,10,14, 9,13,11,15 };
1371
1372/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1373unsigned char default_red[] = {
1374 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1375 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1376};
1377module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1378
1379unsigned char default_grn[] = {
1380 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1381 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1382};
1383module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1384
1385unsigned char default_blu[] = {
1386 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1387 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1388};
1389module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1390
1da177e4
LT		 1391/*
1392 * gotoxy() must verify all boundaries, because the arguments
1393 * might also be negative. If the given position is out of
1394 * bounds, the cursor is placed at the nearest margin.
1395 */
1396static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1397{
1398 int min_y, max_y;
1399
1400 if (new_x < 0)
28bc24fc 1401 vc->state.x = 0;
1da177e4
LT		 1402 else {
1403 if (new_x >= vc->vc_cols)
28bc24fc 1404 vc->state.x = vc->vc_cols - 1;
1da177e4 1405 else
28bc24fc 1406 vc->state.x = new_x;
1da177e4
LT		 1407 }
1408
1409 if (vc->vc_decom) {
1410 min_y = vc->vc_top;
1411 max_y = vc->vc_bottom;
1412 } else {
1413 min_y = 0;
1414 max_y = vc->vc_rows;
1415 }
1416 if (new_y < min_y)
28bc24fc 1417 vc->state.y = min_y;
1da177e4 1418 else if (new_y >= max_y)
28bc24fc 1419 vc->state.y = max_y - 1;
1da177e4 1420 else
28bc24fc
JS		 1421 vc->state.y = new_y;
1422 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1423 (vc->state.x << 1);
1da177e4
LT		 1424 vc->vc_need_wrap = 0;
1425}
1426
1427/* for absolute user moves, when decom is set */
1428static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1429{
1430 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1431}
1432
1b0ec88a 1433void scrollback(struct vc_data *vc)
1da177e4 1434{
1b0ec88a 1435 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1436}
1437
1438void scrollfront(struct vc_data *vc, int lines)
1439{
1440 if (!lines)
1441 lines = vc->vc_rows / 2;
1442 scrolldelta(lines);
1443}
1444
1445static void lf(struct vc_data *vc)
1446{
1447 /* don't scroll if above bottom of scrolling region, or
1448 * if below scrolling region
1449 */
28bc24fc 1450 if (vc->state.y + 1 == vc->vc_bottom)
89765b94 1451 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
28bc24fc
JS		 1452 else if (vc->state.y < vc->vc_rows - 1) {
1453 vc->state.y++;
1da177e4
LT		 1454 vc->vc_pos += vc->vc_size_row;
1455 }
1456 vc->vc_need_wrap = 0;
b293d758 1457 notify_write(vc, '\n');
1da177e4
LT		 1458}
1459
1460static void ri(struct vc_data *vc)
1461{
1462 /* don't scroll if below top of scrolling region, or
1463 * if above scrolling region
1464 */
28bc24fc 1465 if (vc->state.y == vc->vc_top)
89765b94 1466 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
28bc24fc
JS		 1467 else if (vc->state.y > 0) {
1468 vc->state.y--;
1da177e4
LT		 1469 vc->vc_pos -= vc->vc_size_row;
1470 }
1471 vc->vc_need_wrap = 0;
1472}
1473
1474static inline void cr(struct vc_data *vc)
1475{
28bc24fc
JS		 1476 vc->vc_pos -= vc->state.x << 1;
1477 vc->vc_need_wrap = vc->state.x = 0;
b293d758 1478 notify_write(vc, '\r');
1da177e4
LT		 1479}
1480
1481static inline void bs(struct vc_data *vc)
1482{
28bc24fc 1483 if (vc->state.x) {
1da177e4 1484 vc->vc_pos -= 2;
28bc24fc 1485 vc->state.x--;
1da177e4 1486 vc->vc_need_wrap = 0;
b293d758 1487 notify_write(vc, '\b');
1da177e4
LT		 1488 }
1489}
1490
1491static inline void del(struct vc_data *vc)
1492{
1493 /* ignored */
1494}
1495
1496static void csi_J(struct vc_data *vc, int vpar)
1497{
1498 unsigned int count;
1499 unsigned short * start;
1500
1501 switch (vpar) {
1502 case 0: /* erase from cursor to end of display */
28bc24fc
JS		 1503 vc_uniscr_clear_line(vc, vc->state.x,
1504 vc->vc_cols - vc->state.x);
1505 vc_uniscr_clear_lines(vc, vc->state.y + 1,
1506 vc->vc_rows - vc->state.y - 1);
1da177e4
LT		 1507 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1508 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1509 break;
1510 case 1: /* erase from start to cursor */
28bc24fc
JS		 1511 vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1512 vc_uniscr_clear_lines(vc, 0, vc->state.y);
1da177e4
LT		 1513 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1514 start = (unsigned short *)vc->vc_origin;
1da177e4 1515 break;
a6dbe442
NP		 1516 case 3: /* include scrollback */
1517 flush_scrollback(vc);
df561f66 1518 fallthrough;
1da177e4 1519 case 2: /* erase whole display */
d8ae7242 1520 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1521 count = vc->vc_cols * vc->vc_rows;
1522 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1523 break;
1524 default:
1525 return;
1526 }
1527 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
b2ecf006
MP		 1528 if (con_should_update(vc))
1529 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1530 vc->vc_need_wrap = 0;
1531}
1532
1533static void csi_K(struct vc_data *vc, int vpar)
1534{
1535 unsigned int count;
d8ae7242
NP		 1536 unsigned short *start = (unsigned short *)vc->vc_pos;
1537 int offset;
1da177e4
LT		 1538
1539 switch (vpar) {
1540 case 0: /* erase from cursor to end of line */
d8ae7242 1541 offset = 0;
28bc24fc 1542 count = vc->vc_cols - vc->state.x;
1da177e4
LT		 1543 break;
1544 case 1: /* erase from start of line to cursor */
28bc24fc
JS		 1545 offset = -vc->state.x;
1546 count = vc->state.x + 1;
1da177e4
LT		 1547 break;
1548 case 2: /* erase whole line */
28bc24fc 1549 offset = -vc->state.x;
1da177e4 1550 count = vc->vc_cols;
1da177e4
LT		 1551 break;
1552 default:
1553 return;
1554 }
28bc24fc 1555 vc_uniscr_clear_line(vc, vc->state.x + offset, count);
d8ae7242 1556 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1557 vc->vc_need_wrap = 0;
6ca8dfd7 1558 if (con_should_update(vc))
943210ba 1559 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1560}
1561
e8548296
JS		 1562/* erase the following vpar positions */
1563static void csi_X(struct vc_data *vc, unsigned int vpar)
1da177e4 1564{ /* not vt100? */
e8548296 1565 unsigned int count;
1da177e4
LT		 1566
1567 if (!vpar)
1568 vpar++;
e8548296
JS		 1569
1570 count = min(vpar, vc->vc_cols - vc->state.x);
1da177e4 1571
28bc24fc 1572 vc_uniscr_clear_line(vc, vc->state.x, count);
1da177e4 1573 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1574 if (con_should_update(vc))
28bc24fc 1575 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1da177e4
LT		 1576 vc->vc_need_wrap = 0;
1577}
1578
1579static void default_attr(struct vc_data *vc)
1580{
b84ae3dc 1581 vc->state.intensity = VCI_NORMAL;
77bc14f2
JS		 1582 vc->state.italic = false;
1583 vc->state.underline = false;
1584 vc->state.reverse = false;
1585 vc->state.blink = false;
28bc24fc 1586 vc->state.color = vc->vc_def_color;
1da177e4
LT		 1587}
1588
cec5b2a9
AB		 1589struct rgb { u8 r; u8 g; u8 b; };
1590
0f91e142 1591static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1592{
cec5b2a9 1593 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1594 c->r = i&1 ? 0xaa : 0x00;
1595 c->g = i&2 ? 0xaa : 0x00;
1596 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1597 } else if (i < 16) {
0f91e142
JS		 1598 c->r = i&1 ? 0xff : 0x55;
1599 c->g = i&2 ? 0xff : 0x55;
1600 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1601 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1602 c->r = (i - 16) / 36 * 85 / 2;
1603 c->g = (i - 16) / 6 % 6 * 85 / 2;
1604 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1605 } else /* Grayscale ramp. */
0f91e142 1606 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1607}
1608
0f91e142 1609static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1610{
193df022
JS		 1611 u8 hue = 0, max = max3(c->r, c->g, c->b);
1612
1613 if (c->r > max / 2)
1614 hue |= 4;
1615 if (c->g > max / 2)
1616 hue |= 2;
1617 if (c->b > max / 2)
1618 hue |= 1;
1619
1620 if (hue == 7 && max <= 0x55) {
1621 hue = 0;
b84ae3dc 1622 vc->state.intensity = VCI_BOLD;
193df022 1623 } else if (max > 0xaa)
b84ae3dc 1624 vc->state.intensity = VCI_BOLD;
cec5b2a9 1625 else
b84ae3dc 1626 vc->state.intensity = VCI_NORMAL;
193df022 1627
28bc24fc 1628 vc->state.color = (vc->state.color & 0xf0) | hue;
cec5b2a9
AB		 1629}
1630
0f91e142 1631static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1632{
1633 /* For backgrounds, err on the dark side. */
28bc24fc 1634 vc->state.color = (vc->state.color & 0x0f)
0f91e142 1635 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1636}
1637
e05ab238
JS		 1638/*
1639 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1640 * and thus need to be detected and ignored by hand. That standard also
1641 * wants : rather than ; as separators but sequences containing : are currently
1642 * completely ignored by the parser.
e05ab238
JS		 1643 *
1644 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1645 * supporting them.
1646 */
1647static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1648 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1649{
0f91e142
JS		 1650 struct rgb c;
1651
e05ab238
JS		 1652 i++;
1653 if (i > vc->vc_npar)
1654 return i;
1655
0bf1f4a8 1656 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1657 /* 256 colours */
e05ab238 1658 i++;
0f91e142 1659 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1660 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1661 /* 24 bit */
0f91e142
JS		 1662 c.r = vc->vc_par[i + 1];
1663 c.g = vc->vc_par[i + 2];
1664 c.b = vc->vc_par[i + 3];
e05ab238 1665 i += 3;
0f91e142
JS		 1666 } else
1667 return i;
1668
1669 set_color(vc, &c);
e05ab238
JS		 1670
1671 return i;
1672}
1673
ac751efa 1674/* console_lock is held */
1da177e4
LT		 1675static void csi_m(struct vc_data *vc)
1676{
1677 int i;
1678
1679 for (i = 0; i <= vc->vc_npar; i++)
1680 switch (vc->vc_par[i]) {
aada0a34
JS		 1681 case 0: /* all attributes off */
1682 default_attr(vc);
1683 break;
1684 case 1:
b84ae3dc 1685 vc->state.intensity = VCI_BOLD;
aada0a34
JS		 1686 break;
1687 case 2:
b84ae3dc 1688 vc->state.intensity = VCI_HALF_BRIGHT;
aada0a34
JS		 1689 break;
1690 case 3:
77bc14f2 1691 vc->state.italic = true;
aada0a34 1692 break;
65d9982d
MF		 1693 case 21:
1694 /*
1695 * No console drivers support double underline, so
1696 * convert it to a single underline.
1697 */
aada0a34 1698 case 4:
77bc14f2 1699 vc->state.underline = true;
aada0a34
JS		 1700 break;
1701 case 5:
77bc14f2 1702 vc->state.blink = true;
aada0a34
JS		 1703 break;
1704 case 7:
77bc14f2 1705 vc->state.reverse = true;
aada0a34
JS		 1706 break;
1707 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1708 * Select primary font, don't display control chars if
1709 * defined, don't set bit 8 on output.
1710 */
b70ec4d9 1711 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
aada0a34
JS		 1712 vc->vc_disp_ctrl = 0;
1713 vc->vc_toggle_meta = 0;
1714 break;
1715 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1716 * Select first alternate font, lets chars < 32 be
1717 * displayed as ROM chars.
1718 */
1719 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1720 vc->vc_disp_ctrl = 1;
1721 vc->vc_toggle_meta = 0;
1722 break;
1723 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1724 * Select second alternate font, toggle high bit
1725 * before displaying as ROM char.
1726 */
1727 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1728 vc->vc_disp_ctrl = 1;
1729 vc->vc_toggle_meta = 1;
1730 break;
aada0a34 1731 case 22:
b84ae3dc 1732 vc->state.intensity = VCI_NORMAL;
aada0a34
JS		 1733 break;
1734 case 23:
77bc14f2 1735 vc->state.italic = false;
aada0a34
JS		 1736 break;
1737 case 24:
77bc14f2 1738 vc->state.underline = false;
aada0a34
JS		 1739 break;
1740 case 25:
77bc14f2 1741 vc->state.blink = false;
aada0a34
JS		 1742 break;
1743 case 27:
77bc14f2 1744 vc->state.reverse = false;
aada0a34
JS		 1745 break;
1746 case 38:
1747 i = vc_t416_color(vc, i, rgb_foreground);
1748 break;
1749 case 48:
1750 i = vc_t416_color(vc, i, rgb_background);
1751 break;
1752 case 39:
28bc24fc
JS		 1753 vc->state.color = (vc->vc_def_color & 0x0f) |
1754 (vc->state.color & 0xf0);
aada0a34
JS		 1755 break;
1756 case 49:
28bc24fc
JS		 1757 vc->state.color = (vc->vc_def_color & 0xf0) |
1758 (vc->state.color & 0x0f);
aada0a34
JS		 1759 break;
1760 default:
fadb4244
AB		 1761 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1762 if (vc->vc_par[i] < 100)
b84ae3dc 1763 vc->state.intensity = VCI_BOLD;
cc67dc28
AB		 1764 vc->vc_par[i] -= 60;
1765 }
aada0a34 1766 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
28bc24fc
JS		 1767 vc->state.color = color_table[vc->vc_par[i] - 30]
1768 | (vc->state.color & 0xf0);
aada0a34 1769 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
28bc24fc
JS		 1770 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1771 | (vc->state.color & 0x0f);
aada0a34 1772 break;
1da177e4
LT		 1773 }
1774 update_attr(vc);
1775}
1776
de53ce04 1777static void respond_string(const char *p, size_t len, struct tty_port *port)
1da177e4 1778{
de53ce04 1779 tty_insert_flip_string(port, p, len);
5f6a8515 1780 tty_flip_buffer_push(port);
1da177e4
LT		 1781}
1782
1783static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1784{
1785 char buf[40];
de53ce04 1786 int len;
1da177e4 1787
de53ce04
JS		 1788 len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1789 (vc->vc_decom ? vc->vc_top + 1 : 1),
1790 vc->state.x + 1);
1791 respond_string(buf, len, tty->port);
1da177e4
LT		 1792}
1793
1794static inline void status_report(struct tty_struct *tty)
1795{
de53ce04
JS		 1796 static const char teminal_ok[] = "\033[0n";
1797
1798 respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1da177e4
LT		 1799}
1800
6732c8bb 1801static inline void respond_ID(struct tty_struct *tty)
1da177e4 1802{
9a6f72d9
JS		 1803 /* terminal answer to an ESC-Z or csi0c query. */
1804 static const char vt102_id[] = "\033[?6c";
1805
1806 respond_string(vt102_id, strlen(vt102_id), tty->port);
1da177e4
LT		 1807}
1808
1809void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1810{
1811 char buf[8];
de53ce04 1812 int len;
1da177e4 1813
de53ce04
JS		 1814 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1815 (char)('!' + mrx), (char)('!' + mry));
1816 respond_string(buf, len, tty->port);
1da177e4
LT		 1817}
1818
496124e5 1819/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1da177e4
LT		 1820int mouse_reporting(void)
1821{
1822 return vc_cons[fg_console].d->vc_report_mouse;
1823}
1824
ac751efa 1825/* console_lock is held */
1da177e4
LT		 1826static void set_mode(struct vc_data *vc, int on_off)
1827{
1828 int i;
1829
1830 for (i = 0; i <= vc->vc_npar; i++)
2ff5c5a1 1831 if (vc->vc_priv == EPdec) {
1da177e4
LT		 1832 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1833 case 1: /* Cursor keys send ^[Ox/^[[x */
1834 if (on_off)
1835 set_kbd(vc, decckm);
1836 else
1837 clr_kbd(vc, decckm);
1838 break;
1839 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1840#if 0
1841 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1842 /* this alone does not suffice; some user mode
1843 utility has to change the hardware regs */
1844#endif
1845 break;
1846 case 5: /* Inverted screen on/off */
1847 if (vc->vc_decscnm != on_off) {
1848 vc->vc_decscnm = on_off;
b8209f69
JS		 1849 invert_screen(vc, 0,
1850 vc->vc_screenbuf_size,
1851 false);
1da177e4
LT		 1852 update_attr(vc);
1853 }
1854 break;
1855 case 6: /* Origin relative/absolute */
1856 vc->vc_decom = on_off;
1857 gotoxay(vc, 0, 0);
1858 break;
1859 case 7: /* Autowrap on/off */
1860 vc->vc_decawm = on_off;
1861 break;
1862 case 8: /* Autorepeat on/off */
1863 if (on_off)
1864 set_kbd(vc, decarm);
1865 else
1866 clr_kbd(vc, decarm);
1867 break;
1868 case 9:
1869 vc->vc_report_mouse = on_off ? 1 : 0;
1870 break;
1871 case 25: /* Cursor on/off */
1872 vc->vc_deccm = on_off;
1873 break;
1874 case 1000:
1875 vc->vc_report_mouse = on_off ? 2 : 0;
1876 break;
1877 }
1878 } else {
1879 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1880 case 3: /* Monitor (display ctrls) */
1881 vc->vc_disp_ctrl = on_off;
1882 break;
1883 case 4: /* Insert Mode on/off */
1884 vc->vc_decim = on_off;
1885 break;
1886 case 20: /* Lf, Enter == CrLf/Lf */
1887 if (on_off)
1888 set_kbd(vc, lnm);
1889 else
1890 clr_kbd(vc, lnm);
1891 break;
1892 }
1893 }
1894}
1895
ac751efa 1896/* console_lock is held */
1da177e4
LT		 1897static void setterm_command(struct vc_data *vc)
1898{
c3a834e8
JS		 1899 switch (vc->vc_par[0]) {
1900 case 1: /* set color for underline mode */
1901 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1902 vc->vc_ulcolor = color_table[vc->vc_par[1]];
28bc24fc 1903 if (vc->state.underline)
c3a834e8
JS		 1904 update_attr(vc);
1905 }
1906 break;
1907 case 2: /* set color for half intensity mode */
1908 if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1909 vc->vc_halfcolor = color_table[vc->vc_par[1]];
b84ae3dc 1910 if (vc->state.intensity == VCI_HALF_BRIGHT)
c3a834e8
JS		 1911 update_attr(vc);
1912 }
1913 break;
1914 case 8: /* store colors as defaults */
1915 vc->vc_def_color = vc->vc_attr;
1916 if (vc->vc_hi_font_mask == 0x100)
1917 vc->vc_def_color >>= 1;
1918 default_attr(vc);
1919 update_attr(vc);
1920 break;
1921 case 9: /* set blanking interval */
1922 blankinterval = min(vc->vc_par[1], 60U) * 60;
1923 poke_blanked_console();
1924 break;
1925 case 10: /* set bell frequency in Hz */
1926 if (vc->vc_npar >= 1)
1927 vc->vc_bell_pitch = vc->vc_par[1];
1928 else
1929 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1930 break;
1931 case 11: /* set bell duration in msec */
1932 if (vc->vc_npar >= 1)
1933 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1934 msecs_to_jiffies(vc->vc_par[1]) : 0;
1935 else
1936 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1937 break;
1938 case 12: /* bring specified console to the front */
1939 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1940 set_console(vc->vc_par[1] - 1);
1941 break;
1942 case 13: /* unblank the screen */
1943 poke_blanked_console();
1944 break;
1945 case 14: /* set vesa powerdown interval */
1946 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
1947 break;
1948 case 15: /* activate the previous console */
1949 set_console(last_console);
1950 break;
1951 case 16: /* set cursor blink duration in msec */
1952 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1953 vc->vc_par[1] <= USHRT_MAX)
1954 vc->vc_cur_blink_ms = vc->vc_par[1];
1955 else
1956 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1957 break;
1da177e4
LT		 1958 }
1959}
1960
ac751efa 1961/* console_lock is held */
1da177e4
LT		 1962static void csi_at(struct vc_data *vc, unsigned int nr)
1963{
28bc24fc
JS		 1964 if (nr > vc->vc_cols - vc->state.x)
1965 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 1966 else if (!nr)
1967 nr = 1;
1968 insert_char(vc, nr);
1969}
1970
ac751efa 1971/* console_lock is held */
1da177e4
LT		 1972static void csi_L(struct vc_data *vc, unsigned int nr)
1973{
28bc24fc
JS		 1974 if (nr > vc->vc_rows - vc->state.y)
1975 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 1976 else if (!nr)
1977 nr = 1;
28bc24fc 1978 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 1979 vc->vc_need_wrap = 0;
1980}
1981
ac751efa 1982/* console_lock is held */
1da177e4
LT		 1983static void csi_P(struct vc_data *vc, unsigned int nr)
1984{
28bc24fc
JS		 1985 if (nr > vc->vc_cols - vc->state.x)
1986 nr = vc->vc_cols - vc->state.x;
1da177e4
LT		 1987 else if (!nr)
1988 nr = 1;
1989 delete_char(vc, nr);
1990}
1991
ac751efa 1992/* console_lock is held */
1da177e4
LT		 1993static void csi_M(struct vc_data *vc, unsigned int nr)
1994{
28bc24fc
JS		 1995 if (nr > vc->vc_rows - vc->state.y)
1996 nr = vc->vc_rows - vc->state.y;
1da177e4
LT		 1997 else if (!nr)
1998 nr=1;
28bc24fc 1999 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 2000 vc->vc_need_wrap = 0;
2001}
2002
ac751efa 2003/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 2004static void save_cur(struct vc_data *vc)
2005{
28bc24fc 2006 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
1da177e4
LT		 2007}
2008
ac751efa 2009/* console_lock is held */
1da177e4
LT		 2010static void restore_cur(struct vc_data *vc)
2011{
28bc24fc
JS		 2012 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2013
2014 gotoxy(vc, vc->state.x, vc->state.y);
b70ec4d9
JS		 2015 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2016 vc);
1da177e4
LT		 2017 update_attr(vc);
2018 vc->vc_need_wrap = 0;
2019}
2020
b290af68 2021enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
7a99565f 2022 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
3a2b2eb5 2023 ESpalette, ESosc, ESapc, ESpm, ESdcs };
1da177e4 2024
ac751efa 2025/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2026static void reset_terminal(struct vc_data *vc, int do_clear)
2027{
dbee4cff
JS		 2028 unsigned int i;
2029
1da177e4
LT		 2030 vc->vc_top = 0;
2031 vc->vc_bottom = vc->vc_rows;
2032 vc->vc_state = ESnormal;
2ff5c5a1 2033 vc->vc_priv = EPecma;
1da177e4 2034 vc->vc_translate = set_translate(LAT1_MAP, vc);
b70ec4d9
JS		 2035 vc->state.Gx_charset[0] = LAT1_MAP;
2036 vc->state.Gx_charset[1] = GRAF_MAP;
28bc24fc 2037 vc->state.charset = 0;
1da177e4
LT		 2038 vc->vc_need_wrap = 0;
2039 vc->vc_report_mouse = 0;
042f10ec 2040 vc->vc_utf = default_utf8;
1da177e4
LT		 2041 vc->vc_utf_count = 0;
2042
2043 vc->vc_disp_ctrl = 0;
2044 vc->vc_toggle_meta = 0;
2045
2046 vc->vc_decscnm = 0;
2047 vc->vc_decom = 0;
2048 vc->vc_decawm = 1;
f6c06b68 2049 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2050 vc->vc_decim = 0;
2051
079c9534 2052 vt_reset_keyboard(vc->vc_num);
1da177e4 2053
9ea9a886 2054 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2055 vc->vc_complement_mask = vc->vc_s_complement_mask;
2056
2057 default_attr(vc);
2058 update_attr(vc);
2059
dbee4cff
JS		 2060 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2061 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2062 set_bit(i, vc->vc_tab_stop);
1da177e4
LT		 2063
2064 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2065 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2066 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2067
2068 gotoxy(vc, 0, 0);
2069 save_cur(vc);
2070 if (do_clear)
2071 csi_J(vc, 2);
2072}
2073
b4d92b65
JS		 2074static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2075{
b70ec4d9 2076 unsigned char *charset = &vc->state.Gx_charset[which];
b4d92b65
JS		 2077
2078 switch (c) {
2079 case '0':
2080 *charset = GRAF_MAP;
2081 break;
2082 case 'B':
2083 *charset = LAT1_MAP;
2084 break;
2085 case 'U':
2086 *charset = IBMPC_MAP;
2087 break;
2088 case 'K':
2089 *charset = USER_MAP;
2090 break;
2091 }
2092
2093 if (vc->state.charset == which)
2094 vc->vc_translate = set_translate(*charset, vc);
2095}
2096
3a2b2eb5 2097/* is this state an ANSI control string? */
2098static bool ansi_control_string(unsigned int state)
2099{
2100 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2101 return true;
2102 return false;
2103}
2104
ac751efa 2105/* console_lock is held */
1da177e4
LT		 2106static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2107{
2108 /*
2109 * Control characters can be used in the _middle_
3a2b2eb5 2110 * of an escape sequence, aside from ANSI control strings.
1da177e4 2111 */
3a2b2eb5 2112 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
63f3a16d 2113 return;
1da177e4
LT		 2114 switch (c) {
2115 case 0:
2116 return;
2117 case 7:
3a2b2eb5 2118 if (ansi_control_string(vc->vc_state))
63f3a16d
AB		 2119 vc->vc_state = ESnormal;
2120 else if (vc->vc_bell_duration)
1da177e4
LT		 2121 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2122 return;
2123 case 8:
2124 bs(vc);
2125 return;
2126 case 9:
28bc24fc 2127 vc->vc_pos -= (vc->state.x << 1);
dbee4cff
JS		 2128
2129 vc->state.x = find_next_bit(vc->vc_tab_stop,
2130 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2131 vc->state.x + 1);
2132 if (vc->state.x >= VC_TABSTOPS_COUNT)
2133 vc->state.x = vc->vc_cols - 1;
2134
28bc24fc 2135 vc->vc_pos += (vc->state.x << 1);
b293d758 2136 notify_write(vc, '\t');
1da177e4
LT		 2137 return;
2138 case 10: case 11: case 12:
2139 lf(vc);
2140 if (!is_kbd(vc, lnm))
2141 return;
df561f66 2142 fallthrough;
1da177e4
LT		 2143 case 13:
2144 cr(vc);
2145 return;
2146 case 14:
28bc24fc 2147 vc->state.charset = 1;
b70ec4d9 2148 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
1da177e4
LT		 2149 vc->vc_disp_ctrl = 1;
2150 return;
2151 case 15:
28bc24fc 2152 vc->state.charset = 0;
b70ec4d9 2153 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
1da177e4
LT		 2154 vc->vc_disp_ctrl = 0;
2155 return;
2156 case 24: case 26:
2157 vc->vc_state = ESnormal;
2158 return;
2159 case 27:
2160 vc->vc_state = ESesc;
2161 return;
2162 case 127:
2163 del(vc);
2164 return;
2165 case 128+27:
2166 vc->vc_state = ESsquare;
2167 return;
2168 }
2169 switch(vc->vc_state) {
2170 case ESesc:
2171 vc->vc_state = ESnormal;
2172 switch (c) {
2173 case '[':
2174 vc->vc_state = ESsquare;
2175 return;
2176 case ']':
2177 vc->vc_state = ESnonstd;
2178 return;
3a2b2eb5 2179 case '_':
2180 vc->vc_state = ESapc;
2181 return;
2182 case '^':
2183 vc->vc_state = ESpm;
2184 return;
1da177e4
LT		 2185 case '%':
2186 vc->vc_state = ESpercent;
2187 return;
2188 case 'E':
2189 cr(vc);
2190 lf(vc);
2191 return;
2192 case 'M':
2193 ri(vc);
2194 return;
2195 case 'D':
2196 lf(vc);
2197 return;
2198 case 'H':
dbee4cff
JS		 2199 if (vc->state.x < VC_TABSTOPS_COUNT)
2200 set_bit(vc->state.x, vc->vc_tab_stop);
1da177e4 2201 return;
3a2b2eb5 2202 case 'P':
2203 vc->vc_state = ESdcs;
2204 return;
1da177e4
LT		 2205 case 'Z':
2206 respond_ID(tty);
2207 return;
2208 case '7':
2209 save_cur(vc);
2210 return;
2211 case '8':
2212 restore_cur(vc);
2213 return;
2214 case '(':
2215 vc->vc_state = ESsetG0;
2216 return;
2217 case ')':
2218 vc->vc_state = ESsetG1;
2219 return;
2220 case '#':
2221 vc->vc_state = EShash;
2222 return;
2223 case 'c':
2224 reset_terminal(vc, 1);
2225 return;
2226 case '>': /* Numeric keypad */
2227 clr_kbd(vc, kbdapplic);
2228 return;
2229 case '=': /* Appl. keypad */
2230 set_kbd(vc, kbdapplic);
2231 return;
2232 }
2233 return;
2234 case ESnonstd:
2235 if (c=='P') { /* palette escape sequence */
2236 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2237 vc->vc_par[vc->vc_npar] = 0;
2238 vc->vc_npar = 0;
2239 vc->vc_state = ESpalette;
2240 return;
2241 } else if (c=='R') { /* reset palette */
2242 reset_palette(vc);
2243 vc->vc_state = ESnormal;
63f3a16d
AB		 2244 } else if (c>='0' && c<='9')
2245 vc->vc_state = ESosc;
2246 else
1da177e4
LT		 2247 vc->vc_state = ESnormal;
2248 return;
2249 case ESpalette:
74c807ce
AS		 2250 if (isxdigit(c)) {
2251 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2252 if (vc->vc_npar == 7) {
2253 int i = vc->vc_par[0] * 3, j = 1;
2254 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2255 vc->vc_palette[i++] += vc->vc_par[j++];
2256 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2257 vc->vc_palette[i++] += vc->vc_par[j++];
2258 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2259 vc->vc_palette[i] += vc->vc_par[j];
2260 set_palette(vc);
2261 vc->vc_state = ESnormal;
2262 }
2263 } else
2264 vc->vc_state = ESnormal;
2265 return;
2266 case ESsquare:
2267 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2268 vc->vc_par[vc->vc_npar] = 0;
2269 vc->vc_npar = 0;
2270 vc->vc_state = ESgetpars;
2271 if (c == '[') { /* Function key */
2272 vc->vc_state=ESfunckey;
2273 return;
2274 }
5445447b
MH		 2275 switch (c) {
2276 case '?':
2277 vc->vc_priv = EPdec;
2278 return;
2279 case '>':
2280 vc->vc_priv = EPgt;
2281 return;
2282 case '=':
2283 vc->vc_priv = EPeq;
1da177e4 2284 return;
5445447b
MH		 2285 case '<':
2286 vc->vc_priv = EPlt;
2287 return;
2288 }
2289 vc->vc_priv = EPecma;
df561f66 2290 fallthrough;
1da177e4
LT		 2291 case ESgetpars:
2292 if (c == ';' && vc->vc_npar < NPAR - 1) {
2293 vc->vc_npar++;
2294 return;
2295 } else if (c>='0' && c<='9') {
2296 vc->vc_par[vc->vc_npar] *= 10;
2297 vc->vc_par[vc->vc_npar] += c - '0';
2298 return;
b290af68 2299 }
04afcd3a 2300 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
7a99565f
MH		 2301 vc->vc_state = EScsiignore;
2302 return;
2303 }
1da177e4
LT		 2304 vc->vc_state = ESnormal;
2305 switch(c) {
2306 case 'h':
5445447b
MH		 2307 if (vc->vc_priv <= EPdec)
2308 set_mode(vc, 1);
1da177e4
LT		 2309 return;
2310 case 'l':
5445447b
MH		 2311 if (vc->vc_priv <= EPdec)
2312 set_mode(vc, 0);
1da177e4
LT		 2313 return;
2314 case 'c':
2ff5c5a1 2315 if (vc->vc_priv == EPdec) {
1da177e4 2316 if (vc->vc_par[0])
c0e4b3ad
JS		 2317 vc->vc_cursor_type =
2318 CUR_MAKE(vc->vc_par[0],
2319 vc->vc_par[1],
2320 vc->vc_par[2]);
1da177e4 2321 else
9ea9a886 2322 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2323 return;
2324 }
2325 break;
2326 case 'm':
2ff5c5a1 2327 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2328 clear_selection();
2329 if (vc->vc_par[0])
2330 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2331 else
2332 vc->vc_complement_mask = vc->vc_s_complement_mask;
2333 return;
2334 }
2335 break;
2336 case 'n':
2ff5c5a1 2337 if (vc->vc_priv == EPecma) {
1da177e4
LT		 2338 if (vc->vc_par[0] == 5)
2339 status_report(tty);
2340 else if (vc->vc_par[0] == 6)
2341 cursor_report(vc, tty);
2342 }
2343 return;
2344 }
2ff5c5a1
MH		 2345 if (vc->vc_priv != EPecma) {
2346 vc->vc_priv = EPecma;
1da177e4
LT		 2347 return;
2348 }
2349 switch(c) {
2350 case 'G': case '`':
2351 if (vc->vc_par[0])
2352 vc->vc_par[0]--;
28bc24fc 2353 gotoxy(vc, vc->vc_par[0], vc->state.y);
1da177e4
LT		 2354 return;
2355 case 'A':
2356 if (!vc->vc_par[0])
2357 vc->vc_par[0]++;
28bc24fc 2358 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2359 return;
2360 case 'B': case 'e':
2361 if (!vc->vc_par[0])
2362 vc->vc_par[0]++;
28bc24fc 2363 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2364 return;
2365 case 'C': case 'a':
2366 if (!vc->vc_par[0])
2367 vc->vc_par[0]++;
28bc24fc 2368 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
1da177e4
LT		 2369 return;
2370 case 'D':
2371 if (!vc->vc_par[0])
2372 vc->vc_par[0]++;
28bc24fc 2373 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
1da177e4
LT		 2374 return;
2375 case 'E':
2376 if (!vc->vc_par[0])
2377 vc->vc_par[0]++;
28bc24fc 2378 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
1da177e4
LT		 2379 return;
2380 case 'F':
2381 if (!vc->vc_par[0])
2382 vc->vc_par[0]++;
28bc24fc 2383 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
1da177e4
LT		 2384 return;
2385 case 'd':
2386 if (vc->vc_par[0])
2387 vc->vc_par[0]--;
28bc24fc 2388 gotoxay(vc, vc->state.x ,vc->vc_par[0]);
1da177e4
LT		 2389 return;
2390 case 'H': case 'f':
2391 if (vc->vc_par[0])
2392 vc->vc_par[0]--;
2393 if (vc->vc_par[1])
2394 vc->vc_par[1]--;
2395 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2396 return;
2397 case 'J':
2398 csi_J(vc, vc->vc_par[0]);
2399 return;
2400 case 'K':
2401 csi_K(vc, vc->vc_par[0]);
2402 return;
2403 case 'L':
2404 csi_L(vc, vc->vc_par[0]);
2405 return;
2406 case 'M':
2407 csi_M(vc, vc->vc_par[0]);
2408 return;
2409 case 'P':
2410 csi_P(vc, vc->vc_par[0]);
2411 return;
2412 case 'c':
2413 if (!vc->vc_par[0])
2414 respond_ID(tty);
2415 return;
2416 case 'g':
dbee4cff
JS		 2417 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2418 set_bit(vc->state.x, vc->vc_tab_stop);
2419 else if (vc->vc_par[0] == 3)
2420 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
1da177e4
LT		 2421 return;
2422 case 'm':
2423 csi_m(vc);
2424 return;
2425 case 'q': /* DECLL - but only 3 leds */
2426 /* map 0,1,2,3 to 0,1,2,4 */
2427 if (vc->vc_par[0] < 4)
079c9534 2428 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2429 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2430 return;
2431 case 'r':
2432 if (!vc->vc_par[0])
2433 vc->vc_par[0]++;
2434 if (!vc->vc_par[1])
2435 vc->vc_par[1] = vc->vc_rows;
2436 /* Minimum allowed region is 2 lines */
2437 if (vc->vc_par[0] < vc->vc_par[1] &&
2438 vc->vc_par[1] <= vc->vc_rows) {
2439 vc->vc_top = vc->vc_par[0] - 1;
2440 vc->vc_bottom = vc->vc_par[1];
2441 gotoxay(vc, 0, 0);
2442 }
2443 return;
2444 case 's':
2445 save_cur(vc);
2446 return;
2447 case 'u':
2448 restore_cur(vc);
2449 return;
2450 case 'X':
2451 csi_X(vc, vc->vc_par[0]);
2452 return;
2453 case '@':
2454 csi_at(vc, vc->vc_par[0]);
2455 return;
2456 case ']': /* setterm functions */
2457 setterm_command(vc);
2458 return;
2459 }
2460 return;
7a99565f
MH		 2461 case EScsiignore:
2462 if (c >= 20 && c <= 0x3f)
2463 return;
2464 vc->vc_state = ESnormal;
2465 return;
1da177e4
LT		 2466 case ESpercent:
2467 vc->vc_state = ESnormal;
2468 switch (c) {
2469 case '@': /* defined in ISO 2022 */
2470 vc->vc_utf = 0;
2471 return;
2472 case 'G': /* prelim official escape code */
2473 case '8': /* retained for compatibility */
2474 vc->vc_utf = 1;
2475 return;
2476 }
2477 return;
2478 case ESfunckey:
2479 vc->vc_state = ESnormal;
2480 return;
2481 case EShash:
2482 vc->vc_state = ESnormal;
2483 if (c == '8') {
2484 /* DEC screen alignment test. kludge :-) */
2485 vc->vc_video_erase_char =
2486 (vc->vc_video_erase_char & 0xff00) | 'E';
2487 csi_J(vc, 2);
2488 vc->vc_video_erase_char =
2489 (vc->vc_video_erase_char & 0xff00) | ' ';
2490 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2491 }
2492 return;
2493 case ESsetG0:
b4d92b65 2494 vc_setGx(vc, 0, c);
1da177e4
LT		 2495 vc->vc_state = ESnormal;
2496 return;
2497 case ESsetG1:
b4d92b65 2498 vc_setGx(vc, 1, c);
1da177e4
LT		 2499 vc->vc_state = ESnormal;
2500 return;
3a2b2eb5 2501 case ESapc:
2502 return;
63f3a16d
AB		 2503 case ESosc:
2504 return;
3a2b2eb5 2505 case ESpm:
2506 return;
2507 case ESdcs:
2508 return;
1da177e4
LT		 2509 default:
2510 vc->vc_state = ESnormal;
2511 }
2512}
2513
2f1a2ccb 2514/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2515 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
a6fdf0c7 2516 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2f1a2ccb
EK		 2517 */
2518struct interval {
2519 uint32_t first;
2520 uint32_t last;
2521};
2522
f0a8d84f 2523static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2524{
f0a8d84f
TM		 2525 uint32_t ucs = *(uint32_t *)key;
2526 struct interval e = *(struct interval *) elt;
2f1a2ccb 2527
f0a8d84f
TM		 2528 if (ucs > e.last)
2529 return 1;
2530 else if (ucs < e.first)
2531 return -1;
2f1a2ccb
EK		 2532 return 0;
2533}
2534
2535static int is_double_width(uint32_t ucs)
2536{
2537 static const struct interval double_width[] = {
2538 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2539 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2540 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2541 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2542 };
f0a8d84f
TM		 2543 if (ucs < double_width[0].first ||
2544 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2545 return 0;
2546
2547 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2548 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2549}
2550
917ae1a9
JS		 2551struct vc_draw_region {
2552 unsigned long from, to;
2553 int x;
2554};
2555
2556static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
d711ea8f 2557{
917ae1a9 2558 if (draw->x < 0)
d711ea8f
JS		 2559 return;
2560
917ae1a9
JS		 2561 vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2562 (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2563 draw->x);
2564 draw->x = -1;
d711ea8f
JS		 2565}
2566
a018180c
JS		 2567static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2568{
2569 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2570 if (vc->vc_toggle_meta)
2571 c |= 0x80;
2572
2573 return vc->vc_translate[c];
2574 }
2575
2576 return c;
2577}
2578
ede98d12
JS		 2579
2580/**
2581 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2582 * @c: the received character, or U+FFFD for invalid sequences.
2583 */
2584static inline int vc_sanitize_unicode(const int c)
2585{
2586 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2587 return 0xfffd;
2588
2589 return c;
2590}
2591
694d8a48
JS		 2592/**
2593 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
ea239f1e
JS		 2594 * @vc: virtual console
2595 * @c: character to translate
2596 * @rescan: we return true if we need more (continuation) data
694d8a48
JS		 2597 *
2598 * @vc_utf_char is the being-constructed unicode character.
2599 * @vc_utf_count is the number of continuation bytes still expected to arrive.
2600 * @vc_npar is the number of continuation bytes arrived so far.
2601 */
2602static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2603{
2604 static const u32 utf8_length_changes[] = {
2605 0x0000007f, 0x000007ff, 0x0000ffff,
2606 0x001fffff, 0x03ffffff, 0x7fffffff
2607 };
2608
ede98d12 2609 /* Continuation byte received */
694d8a48 2610 if ((c & 0xc0) == 0x80) {
ede98d12
JS		 2611 /* Unexpected continuation byte? */
2612 if (!vc->vc_utf_count)
694d8a48 2613 return 0xfffd;
ede98d12
JS		 2614
2615 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2616 vc->vc_npar++;
2617 if (--vc->vc_utf_count)
2618 goto need_more_bytes;
2619
2620 /* Got a whole character */
2621 c = vc->vc_utf_char;
2622 /* Reject overlong sequences */
2623 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2624 c > utf8_length_changes[vc->vc_npar])
694d8a48 2625 return 0xfffd;
ede98d12
JS		 2626
2627 return vc_sanitize_unicode(c);
694d8a48 2628 }
ede98d12
JS		 2629
2630 /* Single ASCII byte or first byte of a sequence received */
2631 if (vc->vc_utf_count) {
2632 /* Continuation byte expected */
2633 *rescan = true;
2634 vc->vc_utf_count = 0;
694d8a48 2635 return 0xfffd;
ede98d12 2636 }
694d8a48 2637
ede98d12
JS		 2638 /* Nothing to do if an ASCII byte was received */
2639 if (c <= 0x7f)
2640 return c;
2641
2642 /* First byte of a multibyte sequence received */
2643 vc->vc_npar = 0;
2644 if ((c & 0xe0) == 0xc0) {
2645 vc->vc_utf_count = 1;
2646 vc->vc_utf_char = (c & 0x1f);
2647 } else if ((c & 0xf0) == 0xe0) {
2648 vc->vc_utf_count = 2;
2649 vc->vc_utf_char = (c & 0x0f);
2650 } else if ((c & 0xf8) == 0xf0) {
2651 vc->vc_utf_count = 3;
2652 vc->vc_utf_char = (c & 0x07);
2653 } else if ((c & 0xfc) == 0xf8) {
2654 vc->vc_utf_count = 4;
2655 vc->vc_utf_char = (c & 0x03);
2656 } else if ((c & 0xfe) == 0xfc) {
2657 vc->vc_utf_count = 5;
2658 vc->vc_utf_char = (c & 0x01);
2659 } else {
2660 /* 254 and 255 are invalid */
2661 return 0xfffd;
2662 }
2663
2664need_more_bytes:
2665 return -1;
694d8a48
JS		 2666}
2667
a4236348
JS		 2668static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2669{
2670 /* Do no translation at all in control states */
2671 if (vc->vc_state != ESnormal)
2672 return *c;
2673
2674 if (vc->vc_utf && !vc->vc_disp_ctrl)
2675 return *c = vc_translate_unicode(vc, *c, rescan);
2676
2677 /* no utf or alternate charset mode */
2678 return vc_translate_ascii(vc, *c);
2679}
2680
881c8783
JS		 2681static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2682{
2683 if (!vc->vc_can_do_color)
2684 return vc->vc_attr ^ 0x08;
2685
2686 if (vc->vc_hi_font_mask == 0x100)
2687 return (vc->vc_attr & 0x11) |
2688 ((vc->vc_attr & 0xe0) >> 4) |
2689 ((vc->vc_attr & 0x0e) << 4);
2690
2691 return (vc->vc_attr & 0x88) |
2692 ((vc->vc_attr & 0x70) >> 4) |
2693 ((vc->vc_attr & 0x07) << 4);
2694}
2695
754bda98
JS		 2696static bool vc_is_control(struct vc_data *vc, int tc, int c)
2697{
2698 /*
2699 * A bitmap for codes <32. A bit of 1 indicates that the code
2700 * corresponding to that bit number invokes some special action (such
2701 * as cursor movement) and should not be displayed as a glyph unless
2702 * the disp_ctrl mode is explicitly enabled.
2703 */
2704 static const u32 CTRL_ACTION = 0x0d00ff81;
2705 /* Cannot be overridden by disp_ctrl */
2706 static const u32 CTRL_ALWAYS = 0x0800f501;
2707
2708 if (vc->vc_state != ESnormal)
2709 return true;
2710
2711 if (!tc)
2712 return true;
2713
2714 /*
2715 * If the original code was a control character we only allow a glyph
2716 * to be displayed if the code is not normally used (such as for cursor
2717 * movement) or if the disp_ctrl mode has been explicitly enabled.
2718 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2719 * displayed as control characters, as the console would be pretty
2720 * useless without them; to display an arbitrary font position use the
2721 * direct-to-font zone in UTF-8 mode.
2722 */
2723 if (c < 32) {
2724 if (vc->vc_disp_ctrl)
2725 return CTRL_ALWAYS & BIT(c);
2726 else
2727 return vc->vc_utf || (CTRL_ACTION & BIT(c));
2728 }
2729
2730 if (c == 127 && !vc->vc_disp_ctrl)
2731 return true;
2732
2733 if (c == 128 + 27)
2734 return true;
2735
2736 return false;
2737}
2738
391536ab
JS		 2739static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2740 struct vc_draw_region *draw)
2741{
2742 int next_c;
f3205b29 2743 unsigned char vc_attr = vc->vc_attr;
391536ab
JS		 2744 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2745 u8 width = 1;
2746 bool inverse = false;
2747
2748 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2749 if (is_double_width(c))
2750 width = 2;
2751 }
2752
2753 /* Now try to find out how to display it */
2754 tc = conv_uni_to_pc(vc, tc);
2755 if (tc & ~charmask) {
2756 if (tc == -1 || tc == -2)
2757 return -1; /* nothing to display */
2758
2759 /* Glyph not found */
6923e2d7 2760 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
391536ab
JS		 2761 !(c & ~charmask)) {
2762 /*
2763 * In legacy mode use the glyph we get by a 1:1
2764 * mapping.
2765 * This would make absolutely no sense with Unicode in
2766 * mind, but do this for ASCII characters since a font
2767 * may lack Unicode mapping info and we don't want to
2768 * end up with having question marks only.
2769 */
2770 tc = c;
2771 } else {
2772 /*
2773 * Display U+FFFD. If it's not found, display an inverse
2774 * question mark.
2775 */
2776 tc = conv_uni_to_pc(vc, 0xfffd);
2777 if (tc < 0) {
2778 inverse = true;
2779 tc = conv_uni_to_pc(vc, '?');
2780 if (tc < 0)
2781 tc = '?';
f3205b29
JS		 2782
2783 vc_attr = vc_invert_attr(vc);
2784 con_flush(vc, draw);
391536ab
JS		 2785 }
2786 }
2787 }
2788
391536ab
JS		 2789 next_c = c;
2790 while (1) {
2791 if (vc->vc_need_wrap || vc->vc_decim)
2792 con_flush(vc, draw);
2793 if (vc->vc_need_wrap) {
2794 cr(vc);
2795 lf(vc);
2796 }
2797 if (vc->vc_decim)
2798 insert_char(vc, 1);
2799 vc_uniscr_putc(vc, next_c);
f1bcbe14
JS		 2800
2801 if (himask)
2802 tc = ((tc & 0x100) ? himask : 0) |
2803 (tc & 0xff);
2804 tc |= (vc_attr << 8) & ~himask;
2805
2806 scr_writew(tc, (u16 *)vc->vc_pos);
2807
391536ab
JS		 2808 if (con_should_update(vc) && draw->x < 0) {
2809 draw->x = vc->state.x;
2810 draw->from = vc->vc_pos;
2811 }
2812 if (vc->state.x == vc->vc_cols - 1) {
2813 vc->vc_need_wrap = vc->vc_decawm;
2814 draw->to = vc->vc_pos + 2;
2815 } else {
2816 vc->state.x++;
2817 draw->to = (vc->vc_pos += 2);
2818 }
2819
2820 if (!--width)
2821 break;
2822
2823 /* A space is printed in the second column */
2824 tc = conv_uni_to_pc(vc, ' ');
2825 if (tc < 0)
2826 tc = ' ';
2827 next_c = ' ';
2828 }
2829 notify_write(vc, c);
2830
2831 if (inverse)
2832 con_flush(vc, draw);
2833
2834 return 0;
2835}
2836
ac751efa 2837/* acquires console_lock */
1da177e4
LT		 2838static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2839{
917ae1a9
JS		 2840 struct vc_draw_region draw = {
2841 .x = -1,
2842 };
391536ab 2843 int c, tc, n = 0;
1da177e4 2844 unsigned int currcons;
1da177e4 2845 struct vc_data *vc;
0341a4d0 2846 struct vt_notifier_param param;
da823b2d 2847 bool rescan;
1da177e4
LT		 2848
2849 if (in_interrupt())
2850 return count;
2851
ac751efa 2852 console_lock();
1da177e4
LT		 2853 vc = tty->driver_data;
2854 if (vc == NULL) {
bccf1da3 2855 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2856 console_unlock();
1da177e4
LT		 2857 return 0;
2858 }
2859
2860 currcons = vc->vc_num;
2861 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2862 /* could this happen? */
2863 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2864 console_unlock();
2865 return 0;
1da177e4 2866 }
1da177e4 2867
1da177e4
LT		 2868
2869 /* undraw cursor first */
6ca8dfd7 2870 if (con_is_fg(vc))
1da177e4
LT		 2871 hide_cursor(vc);
2872
0341a4d0
KD		 2873 param.vc = vc;
2874
6e94dbc7 2875 while (!tty->flow.stopped && count) {
1da177e4 2876 int orig = *buf;
1da177e4
LT		 2877 buf++;
2878 n++;
2879 count--;
0d1ffef5
JS		 2880rescan_last_byte:
2881 c = orig;
da823b2d 2882 rescan = false;
1da177e4 2883
a4236348
JS		 2884 tc = vc_translate(vc, &c, &rescan);
2885 if (tc == -1)
2886 continue;
1da177e4 2887
0341a4d0
KD		 2888 param.c = tc;
2889 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2890 &param) == NOTIFY_STOP)
2891 continue;
2892
391536ab
JS		 2893 if (vc_is_control(vc, tc, c)) {
2894 con_flush(vc, &draw);
2895 do_con_trol(tty, vc, orig);
1da177e4
LT		 2896 continue;
2897 }
391536ab
JS		 2898
2899 if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2900 continue;
2901
2902 if (rescan)
2903 goto rescan_last_byte;
1da177e4 2904 }
917ae1a9 2905 con_flush(vc, &draw);
1da177e4 2906 console_conditional_schedule();
b293d758 2907 notify_update(vc);
7e1d2263 2908 console_unlock();
1da177e4 2909 return n;
1da177e4
LT		 2910}
2911
2912/*
2913 * This is the console switching callback.
2914 *
2915 * Doing console switching in a process context allows
2916 * us to do the switches asynchronously (needed when we want
2917 * to switch due to a keyboard interrupt). Synchronization
2918 * with other console code and prevention of re-entrancy is
ac751efa 2919 * ensured with console_lock.
1da177e4 2920 */
65f27f38 2921static void console_callback(struct work_struct *ignored)
1da177e4 2922{
ac751efa 2923 console_lock();
1da177e4
LT		 2924
2925 if (want_console >= 0) {
2926 if (want_console != fg_console &&
2927 vc_cons_allocated(want_console)) {
2928 hide_cursor(vc_cons[fg_console].d);
2929 change_console(vc_cons[want_console].d);
2930 /* we only changed when the console had already
2931 been allocated - a new console is not created
2932 in an interrupt routine */
2933 }
2934 want_console = -1;
2935 }
2936 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2937 do_poke_blanked_console = 0;
2938 poke_blanked_console();
2939 }
2940 if (scrollback_delta) {
2941 struct vc_data *vc = vc_cons[fg_console].d;
2942 clear_selection();
97293de9 2943 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2944 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2945 scrollback_delta = 0;
2946 }
2947 if (blank_timer_expired) {
2948 do_blank_screen(0);
2949 blank_timer_expired = 0;
2950 }
b293d758 2951 notify_update(vc_cons[fg_console].d);
1da177e4 2952
ac751efa 2953 console_unlock();
1da177e4
LT		 2954}
2955
b257bc05 2956int set_console(int nr)
1da177e4 2957{
b257bc05
AJ		 2958 struct vc_data *vc = vc_cons[fg_console].d;
2959
2960 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2961 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2962
2963 /*
2964 * Console switch will fail in console_callback() or
2965 * change_console() so there is no point scheduling
2966 * the callback
2967 *
2968 * Existing set_console() users don't check the return
2969 * value so this shouldn't break anything
2970 */
2971 return -EINVAL;
2972 }
2973
1da177e4
LT		 2974 want_console = nr;
2975 schedule_console_callback();
b257bc05
AJ		 2976
2977 return 0;
1da177e4
LT		 2978}
2979
2980struct tty_driver *console_driver;
2981
2982#ifdef CONFIG_VT_CONSOLE
2983
5ada918b
BW		 2984/**
2985 * vt_kmsg_redirect() - Sets/gets the kernel message console
2986 * @new: The new virtual terminal number or -1 if the console should stay
2987 * unchanged
2988 *
2989 * By default, the kernel messages are always printed on the current virtual
2990 * console. However, the user may modify that default with the
2991 * TIOCL_SETKMSGREDIRECT ioctl call.
2992 *
2993 * This function sets the kernel message console to be @new. It returns the old
2994 * virtual console number. The virtual terminal number 0 (both as parameter and
2995 * return value) means no redirection (i.e. always printed on the currently
2996 * active console).
2997 *
2998 * The parameter -1 means that only the current console is returned, but the
2999 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3000 * case to make the code more understandable.
3001 *
3002 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3003 * the parameter and always returns 0.
3004 */
3005int vt_kmsg_redirect(int new)
3006{
3007 static int kmsg_con;
3008
3009 if (new != -1)
3010 return xchg(&kmsg_con, new);
3011 else
3012 return kmsg_con;
3013}
3014
1da177e4
LT		 3015/*
3016 * Console on virtual terminal
3017 *
3018 * The console must be locked when we get here.
3019 */
3020
3021static void vt_console_print(struct console *co, const char *b, unsigned count)
3022{
3023 struct vc_data *vc = vc_cons[fg_console].d;
3024 unsigned char c;
b0940003 3025 static DEFINE_SPINLOCK(printing_lock);
1da177e4 3026 const ushort *start;
6609cff6 3027 ushort start_x, cnt;
5ada918b 3028 int kmsg_console;
1da177e4 3029
b74dbbe1
DV		 3030 WARN_CONSOLE_UNLOCKED();
3031
3032 /* this protects against concurrent oops only */
b0940003 3033 if (!spin_trylock(&printing_lock))
1da177e4
LT		 3034 return;
3035
5ada918b
BW		 3036 kmsg_console = vt_get_kmsg_redirect();
3037 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3038 vc = vc_cons[kmsg_console - 1].d;
1da177e4 3039
1da177e4
LT		 3040 if (!vc_cons_allocated(fg_console)) {
3041 /* impossible */
3042 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3043 goto quit;
3044 }
3045
8d7fc299 3046 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 3047 goto quit;
3048
3049 /* undraw cursor first */
6ca8dfd7 3050 if (con_is_fg(vc))
1da177e4
LT		 3051 hide_cursor(vc);
3052
3053 start = (ushort *)vc->vc_pos;
28bc24fc 3054 start_x = vc->state.x;
6609cff6 3055 cnt = 0;
1da177e4
LT		 3056 while (count--) {
3057 c = *b++;
3058 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
6609cff6 3059 if (cnt && con_is_visible(vc))
28bc24fc 3060 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
6609cff6 3061 cnt = 0;
1da177e4
LT		 3062 if (c == 8) { /* backspace */
3063 bs(vc);
3064 start = (ushort *)vc->vc_pos;
28bc24fc 3065 start_x = vc->state.x;
1da177e4
LT		 3066 continue;
3067 }
3068 if (c != 13)
3069 lf(vc);
3070 cr(vc);
3071 start = (ushort *)vc->vc_pos;
28bc24fc 3072 start_x = vc->state.x;
1da177e4
LT		 3073 if (c == 10 || c == 13)
3074 continue;
3075 }
6609cff6 3076 vc_uniscr_putc(vc, c);
1da177e4 3077 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 3078 notify_write(vc, c);
1da177e4 3079 cnt++;
28bc24fc 3080 if (vc->state.x == vc->vc_cols - 1) {
1da177e4 3081 vc->vc_need_wrap = 1;
6609cff6
NP		 3082 } else {
3083 vc->vc_pos += 2;
28bc24fc 3084 vc->state.x++;
1da177e4
LT		 3085 }
3086 }
6609cff6 3087 if (cnt && con_is_visible(vc))
28bc24fc 3088 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
1da177e4 3089 set_cursor(vc);
b293d758 3090 notify_update(vc);
1da177e4
LT		 3091
3092quit:
b0940003 3093 spin_unlock(&printing_lock);
1da177e4
LT		 3094}
3095
3096static struct tty_driver *vt_console_device(struct console *c, int *index)
3097{
3098 *index = c->index ? c->index-1 : fg_console;
3099 return console_driver;
3100}
3101
7370a25f
SS		 3102static int vt_console_setup(struct console *co, char *options)
3103{
3104 return co->index >= MAX_NR_CONSOLES ? -EINVAL : 0;
3105}
3106
1da177e4
LT		 3107static struct console vt_console_driver = {
3108 .name = "tty",
7370a25f 3109 .setup = vt_console_setup,
1da177e4
LT		 3110 .write = vt_console_print,
3111 .device = vt_console_device,
3112 .unblank = unblank_screen,
3113 .flags = CON_PRINTBUFFER,
3114 .index = -1,
3115};
3116#endif
3117
3118/*
3119 * Handling of Linux-specific VC ioctls
3120 */
3121
3122/*
ac751efa 3123 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3124 *
3125 * There are some functions which don't need it.
3126 *
3127 * There are some functions which can sleep for arbitrary periods
3128 * (paste_selection) but we don't need the lock there anyway.
3129 *
496124e5 3130 * set_selection_user has locking, and definitely needs it
1da177e4
LT		 3131 */
3132
3133int tioclinux(struct tty_struct *tty, unsigned long arg)
3134{
3135 char type, data;
3136 char __user *p = (char __user *)arg;
3137 int lines;
3138 int ret;
3139
1da177e4
LT		 3140 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3141 return -EPERM;
3142 if (get_user(type, p))
3143 return -EFAULT;
3144 ret = 0;
04f378b1 3145
1da177e4
LT		 3146 switch (type)
3147 {
3148 case TIOCL_SETSEL:
496124e5
OK		 3149 ret = set_selection_user((struct tiocl_selection
3150 __user *)(p+1), tty);
1da177e4
LT		 3151 break;
3152 case TIOCL_PASTESEL:
3153 ret = paste_selection(tty);
3154 break;
3155 case TIOCL_UNBLANKSCREEN:
ac751efa 3156 console_lock();
1da177e4 3157 unblank_screen();
ac751efa 3158 console_unlock();
1da177e4
LT		 3159 break;
3160 case TIOCL_SELLOADLUT:
5289475d 3161 console_lock();
1da177e4 3162 ret = sel_loadlut(p);
5289475d 3163 console_unlock();
1da177e4
LT		 3164 break;
3165 case TIOCL_GETSHIFTSTATE:
04f378b1 3166
1da177e4
LT		 3167 /*
3168 * Make it possible to react to Shift+Mousebutton.
3169 * Note that 'shift_state' is an undocumented
3170 * kernel-internal variable; programs not closely
3171 * related to the kernel should not use this.
3172 */
079c9534 3173 data = vt_get_shift_state();
6987dc8a 3174 ret = put_user(data, p);
1da177e4
LT		 3175 break;
3176 case TIOCL_GETMOUSEREPORTING:
20f62579 3177 console_lock(); /* May be overkill */
1da177e4 3178 data = mouse_reporting();
20f62579 3179 console_unlock();
6987dc8a 3180 ret = put_user(data, p);
1da177e4
LT		 3181 break;
3182 case TIOCL_SETVESABLANK:
20f62579 3183 console_lock();
403aac96 3184 ret = set_vesa_blanking(p);
20f62579 3185 console_unlock();
1da177e4 3186 break;
0ca07731 3187 case TIOCL_GETKMSGREDIRECT:
5ada918b 3188 data = vt_get_kmsg_redirect();
6987dc8a 3189 ret = put_user(data, p);
0ca07731 3190 break;
1da177e4
LT		 3191 case TIOCL_SETKMSGREDIRECT:
3192 if (!capable(CAP_SYS_ADMIN)) {
3193 ret = -EPERM;
3194 } else {
3195 if (get_user(data, p+1))
3196 ret = -EFAULT;
3197 else
5ada918b 3198 vt_kmsg_redirect(data);
1da177e4
LT		 3199 }
3200 break;
3201 case TIOCL_GETFGCONSOLE:
20f62579
AC		 3202 /* No locking needed as this is a transiently
3203 correct return anyway if the caller hasn't
3204 disabled switching */
1da177e4
LT		 3205 ret = fg_console;
3206 break;
3207 case TIOCL_SCROLLCONSOLE:
3208 if (get_user(lines, (s32 __user *)(p+4))) {
3209 ret = -EFAULT;
3210 } else {
20f62579
AC		 3211 /* Need the console lock here. Note that lots
3212 of other calls need fixing before the lock
3213 is actually useful ! */
3214 console_lock();
1da177e4 3215 scrollfront(vc_cons[fg_console].d, lines);
20f62579 3216 console_unlock();
1da177e4
LT		 3217 ret = 0;
3218 }
3219 break;
3220 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 3221 console_lock();
1da177e4
LT		 3222 ignore_poke = 1;
3223 do_blank_screen(0);
ac751efa 3224 console_unlock();
1da177e4
LT		 3225 break;
3226 case TIOCL_BLANKEDSCREEN:
3227 ret = console_blanked;
3228 break;
3229 default:
3230 ret = -EINVAL;
3231 break;
3232 }
3233 return ret;
3234}
3235
3236/*
3237 * /dev/ttyN handling
3238 */
3239
3240static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3241{
3242 int retval;
3243
3244 retval = do_con_write(tty, buf, count);
3245 con_flush_chars(tty);
3246
3247 return retval;
3248}
3249
5d19f546 3250static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4 3251{
5d19f546 3252 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3253}
3254
03b3b1a2 3255static unsigned int con_write_room(struct tty_struct *tty)
1da177e4 3256{
6e94dbc7 3257 if (tty->flow.stopped)
1da177e4 3258 return 0;
a88a69c9 3259 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3260}
3261
1da177e4
LT		 3262/*
3263 * con_throttle and con_unthrottle are only used for
3264 * paste_selection(), which has to stuff in a large number of
3265 * characters...
3266 */
3267static void con_throttle(struct tty_struct *tty)
3268{
3269}
3270
3271static void con_unthrottle(struct tty_struct *tty)
3272{
3273 struct vc_data *vc = tty->driver_data;
3274
3275 wake_up_interruptible(&vc->paste_wait);
3276}
3277
3278/*
3279 * Turn the Scroll-Lock LED on when the tty is stopped
3280 */
3281static void con_stop(struct tty_struct *tty)
3282{
3283 int console_num;
3284 if (!tty)
3285 return;
3286 console_num = tty->index;
3287 if (!vc_cons_allocated(console_num))
3288 return;
079c9534 3289 vt_kbd_con_stop(console_num);
1da177e4
LT		 3290}
3291
3292/*
3293 * Turn the Scroll-Lock LED off when the console is started
3294 */
3295static void con_start(struct tty_struct *tty)
3296{
3297 int console_num;
3298 if (!tty)
3299 return;
3300 console_num = tty->index;
3301 if (!vc_cons_allocated(console_num))
3302 return;
079c9534 3303 vt_kbd_con_start(console_num);
1da177e4
LT		 3304}
3305
3306static void con_flush_chars(struct tty_struct *tty)
3307{
3308 struct vc_data *vc;
3309
3310 if (in_interrupt()) /* from flush_to_ldisc */
3311 return;
3312
3313 /* if we race with con_close(), vt may be null */
ac751efa 3314 console_lock();
1da177e4
LT		 3315 vc = tty->driver_data;
3316 if (vc)
3317 set_cursor(vc);
ac751efa 3318 console_unlock();
1da177e4
LT		 3319}
3320
3321/*
3322 * Allocate the console screen memory.
3323 */
bc1e99d9 3324static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3325{
3326 unsigned int currcons = tty->index;
bc1e99d9
JS		 3327 struct vc_data *vc;
3328 int ret;
1da177e4 3329
ac751efa 3330 console_lock();
bc1e99d9
JS		 3331 ret = vc_allocate(currcons);
3332 if (ret)
3333 goto unlock;
feebed65 3334
bc1e99d9 3335 vc = vc_cons[currcons].d;
1da177e4 3336
bc1e99d9
JS		 3337 /* Still being freed */
3338 if (vc->port.tty) {
3339 ret = -ERESTARTSYS;
3340 goto unlock;
3341 }
3342
3343 ret = tty_port_install(&vc->port, driver, tty);
3344 if (ret)
3345 goto unlock;
3346
3347 tty->driver_data = vc;
3348 vc->port.tty = tty;
ca4463bf 3349 tty_port_get(&vc->port);
bc1e99d9
JS		 3350
3351 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3352 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3353 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3354 }
bc1e99d9 3355 if (vc->vc_utf)
adc8d746 3356 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3357 else
adc8d746 3358 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3359unlock:
ac751efa 3360 console_unlock();
1da177e4
LT		 3361 return ret;
3362}
3363
bc1e99d9
JS		 3364static int con_open(struct tty_struct *tty, struct file *filp)
3365{
3366 /* everything done in install */
3367 return 0;
3368}
3369
3370
1da177e4
LT		 3371static void con_close(struct tty_struct *tty, struct file *filp)
3372{
feebed65
AC		 3373 /* Nothing to do - we defer to shutdown */
3374}
1da177e4 3375
feebed65
AC		 3376static void con_shutdown(struct tty_struct *tty)
3377{
3378 struct vc_data *vc = tty->driver_data;
3379 BUG_ON(vc == NULL);
ac751efa 3380 console_lock();
8ce73264 3381 vc->port.tty = NULL;
ac751efa 3382 console_unlock();
1da177e4
LT		 3383}
3384
ca4463bf
EB		 3385static void con_cleanup(struct tty_struct *tty)
3386{
3387 struct vc_data *vc = tty->driver_data;
3388
3389 tty_port_put(&vc->port);
3390}
3391
3855ae1c 3392static int default_color = 7; /* white */
fa6ce9ab
JE		 3393static int default_italic_color = 2; // green (ASCII)
3394static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3395module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3396module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3397module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3398
1da177e4
LT		 3399static void vc_init(struct vc_data *vc, unsigned int rows,
3400 unsigned int cols, int do_clear)
3401{
3402 int j, k ;
3403
3404 vc->vc_cols = cols;
3405 vc->vc_rows = rows;
3406 vc->vc_size_row = cols << 1;
3407 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3408
3409 set_origin(vc);
3410 vc->vc_pos = vc->vc_origin;
3411 reset_vc(vc);
3412 for (j=k=0; j<16; j++) {
3413 vc->vc_palette[k++] = default_red[j] ;
3414 vc->vc_palette[k++] = default_grn[j] ;
3415 vc->vc_palette[k++] = default_blu[j] ;
3416 }
3855ae1c 3417 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3418 vc->vc_ulcolor = default_underline_color;
3419 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3420 vc->vc_halfcolor = 0x08; /* grey */
3421 init_waitqueue_head(&vc->paste_wait);
3422 reset_terminal(vc, do_clear);
3423}
3424
3425/*
3426 * This routine initializes console interrupts, and does nothing
3427 * else. If you want the screen to clear, call tty_write with
3428 * the appropriate escape-sequence.
3429 */
3430
3431static int __init con_init(void)
3432{
3433 const char *display_desc = NULL;
3434 struct vc_data *vc;
3e795de7 3435 unsigned int currcons = 0, i;
1da177e4 3436
ac751efa 3437 console_lock();
1da177e4 3438
805ece2a
AS		 3439 if (!conswitchp)
3440 conswitchp = &dummy_con;
3441 display_desc = conswitchp->con_startup();
1da177e4
LT		 3442 if (!display_desc) {
3443 fg_console = 0;
ac751efa 3444 console_unlock();
1da177e4
LT		 3445 return 0;
3446 }
3447
3e795de7
AD		 3448 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3449 struct con_driver *con_driver = &registered_con_driver[i];
3450
3451 if (con_driver->con == NULL) {
3452 con_driver->con = conswitchp;
3453 con_driver->desc = display_desc;
3454 con_driver->flag = CON_DRIVER_FLAG_INIT;
3455 con_driver->first = 0;
3456 con_driver->last = MAX_NR_CONSOLES - 1;
3457 break;
3458 }
3459 }
3460
3461 for (i = 0; i < MAX_NR_CONSOLES; i++)
3462 con_driver_map[i] = conswitchp;
3463
1da177e4
LT		 3464 if (blankinterval) {
3465 blank_state = blank_normal_wait;
f324edc8 3466 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3467 }
3468
1da177e4 3469 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3470 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3471 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3472 tty_port_init(&vc->port);
1da177e4 3473 visual_init(vc, currcons, 1);
ce684552 3474 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
a5f4f52e 3475 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3476 vc_init(vc, vc->vc_rows, vc->vc_cols,
3477 currcons || !vc->vc_sw->con_save_screen);
3478 }
3479 currcons = fg_console = 0;
3480 master_display_fg = vc = vc_cons[currcons].d;
3481 set_origin(vc);
3482 save_screen(vc);
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");
1083a7be
TI		 3542 tty0dev = device_create_with_groups(tty_class, NULL,
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
3574#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3575
3576static struct class *vtconsole_class;
3577
50e244cc 3578static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3579 int deflt)
1da177e4 3580{
3e795de7
AD		 3581 struct module *owner = csw->owner;
3582 const char *desc = NULL;
3583 struct con_driver *con_driver;
3584 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3585
1da177e4
LT		 3586 if (!try_module_get(owner))
3587 return -ENODEV;
3588
50e244cc 3589 WARN_CONSOLE_UNLOCKED();
1c8ce271 3590
3e795de7
AD		 3591 /* check if driver is registered */
3592 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3593 con_driver = &registered_con_driver[i];
3594
3595 if (con_driver->con == csw) {
3596 desc = con_driver->desc;
3597 retval = 0;
3598 break;
3599 }
3600 }
3601
3602 if (retval)
3603 goto err;
3604
3605 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3606 csw->con_startup();
3607 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3608 }
1c8ce271 3609
1da177e4
LT		 3610 if (deflt) {
3611 if (conswitchp)
3612 module_put(conswitchp->owner);
1c8ce271 3613
1da177e4
LT		 3614 __module_get(owner);
3615 conswitchp = csw;
3616 }
3617
3e795de7
AD		 3618 first = max(first, con_driver->first);
3619 last = min(last, con_driver->last);
3620
1da177e4
LT		 3621 for (i = first; i <= last; i++) {
3622 int old_was_color;
3623 struct vc_data *vc = vc_cons[i].d;
3624
3625 if (con_driver_map[i])
3626 module_put(con_driver_map[i]->owner);
3627 __module_get(owner);
3628 con_driver_map[i] = csw;
3629
3630 if (!vc || !vc->vc_sw)
3631 continue;
3632
3633 j = i;
1c8ce271 3634
6ca8dfd7 3635 if (con_is_visible(vc)) {
4ee1acce 3636 k = i;
1da177e4 3637 save_screen(vc);
4ee1acce
DH		 3638 }
3639
1da177e4
LT		 3640 old_was_color = vc->vc_can_do_color;
3641 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3642 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3643 visual_init(vc, i, 0);
1c8ce271 3644 set_origin(vc);
1da177e4
LT		 3645 update_attr(vc);
3646
3647 /* If the console changed between mono <-> color, then
3648 * the attributes in the screenbuf will be wrong. The
3649 * following resets all attributes to something sane.
3650 */
3651 if (old_was_color != vc->vc_can_do_color)
3652 clear_buffer_attributes(vc);
1da177e4 3653 }
4ee1acce 3654
1ffdda95 3655 pr_info("Console: switching ");
1da177e4 3656 if (!deflt)
bccf1da3 3657 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3658 if (j >= 0) {
3659 struct vc_data *vc = vc_cons[j].d;
3660
bccf1da3
JP		 3661 pr_cont("to %s %s %dx%d\n",
3662 vc->vc_can_do_color ? "colour" : "mono",
3663 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3664
3665 if (k >= 0) {
3666 vc = vc_cons[k].d;
3667 update_screen(vc);
3668 }
bccf1da3
JP		 3669 } else {
3670 pr_cont("to %s\n", desc);
3671 }
1da177e4 3672
3e795de7
AD		 3673 retval = 0;
3674err:
1da177e4 3675 module_put(owner);
3e795de7
AD		 3676 return retval;
3677};
1da177e4 3678
50e244cc 3679
13ae6645 3680#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86 3681int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3682{
3e795de7
AD		 3683 struct module *owner = csw->owner;
3684 const struct consw *defcsw = NULL;
3685 struct con_driver *con_driver = NULL, *con_back = NULL;
3686 int i, retval = -ENODEV;
1da177e4 3687
3e795de7
AD		 3688 if (!try_module_get(owner))
3689 return -ENODEV;
3690
e93a9a86 3691 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3692
3693 /* check if driver is registered and if it is unbindable */
3694 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3695 con_driver = &registered_con_driver[i];
3696
3697 if (con_driver->con == csw &&
6db4063c 3698 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3699 retval = 0;
3700 break;
3701 }
3702 }
3703
e93a9a86 3704 if (retval)
3e795de7 3705 goto err;
3e795de7 3706
6db4063c
AD		 3707 retval = -ENODEV;
3708
3e795de7
AD		 3709 /* check if backup driver exists */
3710 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3711 con_back = &registered_con_driver[i];
3712
249f7b3e 3713 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3714 defcsw = con_back->con;
3715 retval = 0;
3716 break;
3717 }
3718 }
3719
e93a9a86 3720 if (retval)
3e795de7 3721 goto err;
3e795de7 3722
e93a9a86 3723 if (!con_is_bound(csw))
3e795de7 3724 goto err;
3e795de7
AD		 3725
3726 first = max(first, con_driver->first);
3727 last = min(last, con_driver->last);
3728
3729 for (i = first; i <= last; i++) {
1da177e4
LT		 3730 if (con_driver_map[i] == csw) {
3731 module_put(csw->owner);
3732 con_driver_map[i] = NULL;
3733 }
3e795de7
AD		 3734 }
3735
3736 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3737 const struct consw *defconsw = conswitchp;
3738
3e795de7
AD		 3739 defcsw->con_startup();
3740 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3741 /*
3742 * vgacon may change the default driver to point
3743 * to dummycon, we restore it here...
3744 */
3745 conswitchp = defconsw;
3e795de7
AD		 3746 }
3747
3748 if (!con_is_bound(csw))
3749 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3750
6db4063c 3751 /* ignore return value, binding should not fail */
50e244cc 3752 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3753err:
3754 module_put(owner);
3755 return retval;
3756
3757}
e93a9a86 3758EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3759
6db4063c
AD		 3760static int vt_bind(struct con_driver *con)
3761{
3762 const struct consw *defcsw = NULL, *csw = NULL;
3763 int i, more = 1, first = -1, last = -1, deflt = 0;
3764
77232f79 3765 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3766 goto err;
3767
3768 csw = con->con;
3769
3770 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3771 struct con_driver *con = &registered_con_driver[i];
3772
3773 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3774 defcsw = con->con;
3775 break;
3776 }
3777 }
3778
3779 if (!defcsw)
3780 goto err;
3781
3782 while (more) {
3783 more = 0;
3784
3785 for (i = con->first; i <= con->last; i++) {
3786 if (con_driver_map[i] == defcsw) {
3787 if (first == -1)
3788 first = i;
3789 last = i;
3790 more = 1;
3791 } else if (first != -1)
3792 break;
3793 }
3794
3795 if (first == 0 && last == MAX_NR_CONSOLES -1)
3796 deflt = 1;
3797
4c215fe8 3798 if (first != -1)
c62a1e57 3799 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3800
3801 first = -1;
3802 last = -1;
3803 deflt = 0;
3804 }
3805
3806err:
3807 return 0;
3808}
3809
3810static int vt_unbind(struct con_driver *con)
3811{
3812 const struct consw *csw = NULL;
3813 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3814 int ret;
6db4063c 3815
77232f79 3816 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3817 goto err;
3818
3819 csw = con->con;
3820
3821 while (more) {
3822 more = 0;
3823
3824 for (i = con->first; i <= con->last; i++) {
3825 if (con_driver_map[i] == csw) {
3826 if (first == -1)
3827 first = i;
3828 last = i;
3829 more = 1;
3830 } else if (first != -1)
3831 break;
3832 }
3833
3834 if (first == 0 && last == MAX_NR_CONSOLES -1)
3835 deflt = 1;
3836
618f2b90 3837 if (first != -1) {
f418f2ec 3838 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3839 if (ret != 0)
3840 return ret;
618f2b90 3841 }
6db4063c
AD		 3842
3843 first = -1;
3844 last = -1;
3845 deflt = 0;
3846 }
3847
3848err:
3849 return 0;
3850}
13ae6645
AD		 3851#else
3852static inline int vt_bind(struct con_driver *con)
3853{
3854 return 0;
3855}
3856static inline int vt_unbind(struct con_driver *con)
3857{
3858 return 0;
3859}
3860#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3861
805952a8 3862static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3863 const char *buf, size_t count)
3864{
805952a8 3865 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3866 int bind = simple_strtoul(buf, NULL, 0);
3867
4c215fe8
ID		 3868 console_lock();
3869
6db4063c
AD		 3870 if (bind)
3871 vt_bind(con);
3872 else
3873 vt_unbind(con);
3874
4c215fe8
ID		 3875 console_unlock();
3876
6db4063c
AD		 3877 return count;
3878}
3879
805952a8
GKH		 3880static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3881 char *buf)
6db4063c 3882{
805952a8 3883 struct con_driver *con = dev_get_drvdata(dev);
61d51456
DV		 3884 int bind;
3885
3886 console_lock();
3887 bind = con_is_bound(con->con);
3888 console_unlock();
6db4063c 3889
ebaed53c 3890 return sysfs_emit(buf, "%i\n", bind);
6db4063c
AD		 3891}
3892
805952a8
GKH		 3893static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3894 char *buf)
6db4063c 3895{
805952a8 3896 struct con_driver *con = dev_get_drvdata(dev);
6db4063c 3897
ebaed53c 3898 return sysfs_emit(buf, "%s %s\n",
6db4063c
AD		 3899 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3900 con->desc);
3901
3902}
3903
1083a7be
TI		 3904static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3905static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3906
3907static struct attribute *con_dev_attrs[] = {
3908 &dev_attr_bind.attr,
3909 &dev_attr_name.attr,
3910 NULL
6db4063c
AD		 3911};
3912
1083a7be
TI		 3913ATTRIBUTE_GROUPS(con_dev);
3914
805952a8 3915static int vtconsole_init_device(struct con_driver *con)
6db4063c 3916{
928e964f 3917 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3918 return 0;
6db4063c
AD		 3919}
3920
805952a8 3921static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3922{
1083a7be 3923 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3924}
3925
3e795de7
AD		 3926/**
3927 * con_is_bound - checks if driver is bound to the console
3928 * @csw: console driver
3929 *
3930 * RETURNS: zero if unbound, nonzero if bound
3931 *
3932 * Drivers can call this and if zero, they should release
3933 * all resources allocated on con_startup()
3934 */
3935int con_is_bound(const struct consw *csw)
3936{
3937 int i, bound = 0;
3938
ddde3c18
DV		 3939 WARN_CONSOLE_UNLOCKED();
3940
3e795de7
AD		 3941 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3942 if (con_driver_map[i] == csw) {
3943 bound = 1;
3944 break;
3945 }
3946 }
3947
3948 return bound;
3949}
3950EXPORT_SYMBOL(con_is_bound);
3951
ddde3c18
DV		 3952/**
3953 * con_is_visible - checks whether the current console is visible
3954 * @vc: virtual console
3955 *
3956 * RETURNS: zero if not visible, nonzero if visible
3957 */
3958bool con_is_visible(const struct vc_data *vc)
3959{
3960 WARN_CONSOLE_UNLOCKED();
3961
3962 return *vc->vc_display_fg == vc;
3963}
3964EXPORT_SYMBOL(con_is_visible);
3965
b45cfba4
JB		 3966/**
3967 * con_debug_enter - prepare the console for the kernel debugger
ea239f1e 3968 * @vc: virtual console
b45cfba4
JB		 3969 *
3970 * Called when the console is taken over by the kernel debugger, this
3971 * function needs to save the current console state, then put the console
3972 * into a state suitable for the kernel debugger.
3973 *
3974 * RETURNS:
3975 * Zero on success, nonzero if a failure occurred when trying to prepare
3976 * the console for the debugger.
3977 */
3978int con_debug_enter(struct vc_data *vc)
3979{
3980 int ret = 0;
3981
3982 saved_fg_console = fg_console;
3983 saved_last_console = last_console;
3984 saved_want_console = want_console;
3985 saved_vc_mode = vc->vc_mode;
beed5336 3986 saved_console_blanked = console_blanked;
b45cfba4
JB		 3987 vc->vc_mode = KD_TEXT;
3988 console_blanked = 0;
3989 if (vc->vc_sw->con_debug_enter)
3990 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3991#ifdef CONFIG_KGDB_KDB
3992 /* Set the initial LINES variable if it is not already set */
3993 if (vc->vc_rows < 999) {
3994 int linecount;
3995 char lns[4];
3996 const char *setargs[3] = {
3997 "set",
3998 "LINES",
3999 lns,
4000 };
4001 if (kdbgetintenv(setargs[0], &linecount)) {
4002 snprintf(lns, 4, "%i", vc->vc_rows);
4003 kdb_set(2, setargs);
4004 }
4005 }
17b572e8
JW		 4006 if (vc->vc_cols < 999) {
4007 int colcount;
4008 char cols[4];
4009 const char *setargs[3] = {
4010 "set",
4011 "COLUMNS",
4012 cols,
4013 };
4014 if (kdbgetintenv(setargs[0], &colcount)) {
4015 snprintf(cols, 4, "%i", vc->vc_cols);
4016 kdb_set(2, setargs);
4017 }
4018 }
81d44507 4019#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 4020 return ret;
4021}
4022EXPORT_SYMBOL_GPL(con_debug_enter);
4023
4024/**
4025 * con_debug_leave - restore console state
b45cfba4
JB		 4026 *
4027 * Restore the console state to what it was before the kernel debugger
4028 * was invoked.
4029 *
4030 * RETURNS:
4031 * Zero on success, nonzero if a failure occurred when trying to restore
4032 * the console.
4033 */
4034int con_debug_leave(void)
4035{
4036 struct vc_data *vc;
4037 int ret = 0;
4038
4039 fg_console = saved_fg_console;
4040 last_console = saved_last_console;
4041 want_console = saved_want_console;
beed5336 4042 console_blanked = saved_console_blanked;
b45cfba4
JB		 4043 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4044
4045 vc = vc_cons[fg_console].d;
4046 if (vc->vc_sw->con_debug_leave)
4047 ret = vc->vc_sw->con_debug_leave(vc);
4048 return ret;
4049}
4050EXPORT_SYMBOL_GPL(con_debug_leave);
4051
50e244cc 4052static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 4053{
4054 struct module *owner = csw->owner;
4055 struct con_driver *con_driver;
4056 const char *desc;
96317e9e 4057 int i, retval;
3e795de7 4058
50e244cc
AC		 4059 WARN_CONSOLE_UNLOCKED();
4060
3e795de7
AD		 4061 if (!try_module_get(owner))
4062 return -ENODEV;
4063
3e795de7
AD		 4064 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4065 con_driver = &registered_con_driver[i];
4066
4067 /* already registered */
96317e9e 4068 if (con_driver->con == csw) {
c55c63c6 4069 retval = -EBUSY;
96317e9e
JS		 4070 goto err;
4071 }
3e795de7
AD		 4072 }
4073
3e795de7 4074 desc = csw->con_startup();
6798df4c
JS		 4075 if (!desc) {
4076 retval = -ENODEV;
3e795de7 4077 goto err;
6798df4c 4078 }
3e795de7
AD		 4079
4080 retval = -EINVAL;
4081
4082 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4083 con_driver = &registered_con_driver[i];
4084
d364b5c3
ID		 4085 if (con_driver->con == NULL &&
4086 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 4087 con_driver->con = csw;
4088 con_driver->desc = desc;
6db4063c
AD		 4089 con_driver->node = i;
4090 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 4091 CON_DRIVER_FLAG_INIT;
4092 con_driver->first = first;
4093 con_driver->last = last;
4094 retval = 0;
4095 break;
4096 }
4097 }
4098
6db4063c
AD		 4099 if (retval)
4100 goto err;
4101
1083a7be
TI		 4102 con_driver->dev =
4103 device_create_with_groups(vtconsole_class, NULL,
4104 MKDEV(0, con_driver->node),
4105 con_driver, con_dev_groups,
4106 "vtcon%i", con_driver->node);
805952a8 4107 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 4108 pr_warn("Unable to create device for %s; errno = %ld\n",
4109 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 4110 con_driver->dev = NULL;
6db4063c 4111 } else {
805952a8 4112 vtconsole_init_device(con_driver);
6db4063c 4113 }
928e964f 4114
3e795de7 4115err:
3e795de7
AD		 4116 module_put(owner);
4117 return retval;
4118}
50e244cc 4119
3e795de7
AD		 4120
4121/**
50539dd4 4122 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 4123 * @csw: console driver
4124 *
4125 * DESCRIPTION: All drivers that registers to the console layer must
4126 * call this function upon exit, or if the console driver is in a state
4127 * where it won't be able to handle console services, such as the
4128 * framebuffer console without loaded framebuffer drivers.
4129 *
4130 * The driver must unbind first prior to unregistration.
4131 */
e93a9a86
TI		 4132int do_unregister_con_driver(const struct consw *csw)
4133{
d9c660e7 4134 int i;
3e795de7
AD		 4135
4136 /* cannot unregister a bound driver */
4137 if (con_is_bound(csw))
d9c660e7
DV		 4138 return -EBUSY;
4139
4140 if (csw == conswitchp)
4141 return -EINVAL;
3e795de7
AD		 4142
4143 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4144 struct con_driver *con_driver = &registered_con_driver[i];
4145
2cf30f75 4146 if (con_driver->con == csw) {
d364b5c3
ID		 4147 /*
4148 * Defer the removal of the sysfs entries since that
4149 * will acquire the kernfs s_active lock and we can't
4150 * acquire this lock while holding the console lock:
4151 * the unbind sysfs entry imposes already the opposite
4152 * order. Reset con already here to prevent any later
4153 * lookup to succeed and mark this slot as zombie, so
4154 * it won't get reused until we complete the removal
4155 * in the deferred work.
4156 */
3e795de7 4157 con_driver->con = NULL;
d364b5c3
ID		 4158 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4159 schedule_work(&con_driver_unregister_work);
4160
d9c660e7 4161 return 0;
3e795de7
AD		 4162 }
4163 }
d9c660e7
DV		 4164
4165 return -ENODEV;
3e795de7 4166}
e93a9a86 4167EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4168
d364b5c3
ID		 4169static void con_driver_unregister_callback(struct work_struct *ignored)
4170{
4171 int i;
4172
4173 console_lock();
4174
4175 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4176 struct con_driver *con_driver = &registered_con_driver[i];
4177
4178 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4179 continue;
4180
4181 console_unlock();
4182
4183 vtconsole_deinit_device(con_driver);
4184 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4185
4186 console_lock();
4187
4188 if (WARN_ON_ONCE(con_driver->con))
4189 con_driver->con = NULL;
4190 con_driver->desc = NULL;
4191 con_driver->dev = NULL;
4192 con_driver->node = 0;
4193 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4194 con_driver->flag = 0;
4195 con_driver->first = 0;
4196 con_driver->last = 0;
4197 }
4198
4199 console_unlock();
4200}
4201
3e795de7
AD		 4202/*
4203 * If we support more console drivers, this function is used
4204 * when a driver wants to take over some existing consoles
4205 * and become default driver for newly opened ones.
4206 *
0095ab42 4207 * do_take_over_console is basically a register followed by bind
50e244cc
AC		 4208 */
4209int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4210{
4211 int err;
4212
4213 err = do_register_con_driver(csw, first, last);
4214 /*
4215 * If we get an busy error we still want to bind the console driver
4216 * and return success, as we may have unbound the console driver
4217 * but not unregistered it.
4218 */
4219 if (err == -EBUSY)
4220 err = 0;
4221 if (!err)
4222 do_bind_con_driver(csw, first, last, deflt);
4223
4224 return err;
4225}
4226EXPORT_SYMBOL_GPL(do_take_over_console);
4227
3e795de7
AD		 4228
4229/*
4230 * give_up_console is a wrapper to unregister_con_driver. It will only
4231 * work if driver is fully unbound.
4232 */
4233void give_up_console(const struct consw *csw)
4234{
70125e76
WY		 4235 console_lock();
4236 do_unregister_con_driver(csw);
4237 console_unlock();
3e795de7
AD		 4238}
4239
6db4063c 4240static int __init vtconsole_class_init(void)
3e795de7 4241{
6db4063c 4242 int i;
3e795de7 4243
6db4063c
AD		 4244 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4245 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4246 pr_warn("Unable to create vt console class; errno = %ld\n",
4247 PTR_ERR(vtconsole_class));
6db4063c
AD		 4248 vtconsole_class = NULL;
4249 }
3e795de7 4250
6db4063c 4251 /* Add system drivers to sysfs */
3e795de7
AD		 4252 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4253 struct con_driver *con = &registered_con_driver[i];
4254
805952a8 4255 if (con->con && !con->dev) {
1083a7be
TI		 4256 con->dev =
4257 device_create_with_groups(vtconsole_class, NULL,
4258 MKDEV(0, con->node),
4259 con, con_dev_groups,
4260 "vtcon%i", con->node);
6db4063c 4261
805952a8 4262 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4263 pr_warn("Unable to create device for %s; errno = %ld\n",
4264 con->desc, PTR_ERR(con->dev));
805952a8 4265 con->dev = NULL;
6db4063c 4266 } else {
805952a8 4267 vtconsole_init_device(con);
6db4063c 4268 }
3e795de7 4269 }
3e795de7
AD		 4270 }
4271
3e795de7
AD		 4272 return 0;
4273}
6db4063c 4274postcore_initcall(vtconsole_class_init);
3e795de7 4275
1da177e4
LT		 4276#endif
4277
4278/*
4279 * Screen blanking
4280 */
4281
403aac96 4282static int set_vesa_blanking(char __user *p)
1da177e4 4283{
403aac96
YY		 4284 unsigned int mode;
4285
4286 if (get_user(mode, p + 1))
4287 return -EFAULT;
4288
4289 vesa_blank_mode = (mode < 4) ? mode : 0;
4290 return 0;
1da177e4
LT		 4291}
4292
1da177e4
LT		 4293void do_blank_screen(int entering_gfx)
4294{
4295 struct vc_data *vc = vc_cons[fg_console].d;
4296 int i;
4297
a135513c
DV		 4298 might_sleep();
4299
1da177e4
LT		 4300 WARN_CONSOLE_UNLOCKED();
4301
4302 if (console_blanked) {
4303 if (blank_state == blank_vesa_wait) {
4304 blank_state = blank_off;
d060a321 4305 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4306 }
4307 return;
4308 }
1da177e4
LT		 4309
4310 /* entering graphics mode? */
4311 if (entering_gfx) {
4312 hide_cursor(vc);
4313 save_screen(vc);
4314 vc->vc_sw->con_blank(vc, -1, 1);
4315 console_blanked = fg_console + 1;
b6e8f00f 4316 blank_state = blank_off;
1da177e4
LT		 4317 set_origin(vc);
4318 return;
4319 }
4320
b6e8f00f 4321 blank_state = blank_off;
4322
1da177e4
LT		 4323 /* don't blank graphics */
4324 if (vc->vc_mode != KD_TEXT) {
4325 console_blanked = fg_console + 1;
4326 return;
4327 }
4328
4329 hide_cursor(vc);
4330 del_timer_sync(&console_timer);
4331 blank_timer_expired = 0;
4332
4333 save_screen(vc);
4334 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4335 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4336 console_blanked = fg_console + 1;
4337 if (i)
4338 set_origin(vc);
4339
4340 if (console_blank_hook && console_blank_hook(1))
4341 return;
4342
d060a321 4343 if (vesa_off_interval && vesa_blank_mode) {
030babac 4344 blank_state = blank_vesa_wait;
1da177e4
LT		 4345 mod_timer(&console_timer, jiffies + vesa_off_interval);
4346 }
8b92e87d 4347 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4348}
4349EXPORT_SYMBOL(do_blank_screen);
4350
4351/*
4352 * Called by timer as well as from vt_console_driver
4353 */
4354void do_unblank_screen(int leaving_gfx)
4355{
4356 struct vc_data *vc;
4357
4358 /* This should now always be called from a "sane" (read: can schedule)
4359 * context for the sake of the low level drivers, except in the special
4360 * case of oops_in_progress
4361 */
4362 if (!oops_in_progress)
4363 might_sleep();
4364
4365 WARN_CONSOLE_UNLOCKED();
4366
4367 ignore_poke = 0;
4368 if (!console_blanked)
4369 return;
4370 if (!vc_cons_allocated(fg_console)) {
4371 /* impossible */
e620e548
JP		 4372 pr_warn("unblank_screen: tty %d not allocated ??\n",
4373 fg_console + 1);
1da177e4
LT		 4374 return;
4375 }
4376 vc = vc_cons[fg_console].d;
8d7fc299 4377 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4378 return; /* but leave console_blanked != 0 */
4379
4380 if (blankinterval) {
f324edc8 4381 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4382 blank_state = blank_normal_wait;
4383 }
4384
4385 console_blanked = 0;
8d7fc299 4386 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4387 /* Low-level driver cannot restore -> do it ourselves */
4388 update_screen(vc);
4389 if (console_blank_hook)
4390 console_blank_hook(0);
4391 set_palette(vc);
4392 set_cursor(vc);
8b92e87d 4393 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4394}
4395EXPORT_SYMBOL(do_unblank_screen);
4396
4397/*
4398 * This is called by the outside world to cause a forced unblank, mostly for
4399 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4400 * call it with 1 as an argument and so force a mode restore... that may kill
4401 * X or at least garbage the screen but would also make the Oops visible...
4402 */
0a64ce6e 4403static void unblank_screen(void)
1da177e4
LT		 4404{
4405 do_unblank_screen(0);
4406}
4407
4408/*
70522e12 4409 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4410 * (console operations can still happen at irq time, but only from printk which
70522e12 4411 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4412 */
24ed960a 4413static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4414{
4415 blank_timer_expired = 1;
4416 schedule_work(&console_work);
4417}
4418
4419void poke_blanked_console(void)
4420{
4421 WARN_CONSOLE_UNLOCKED();
4422
4423 /* Add this so we quickly catch whoever might call us in a non
4424 * safe context. Nowadays, unblank_screen() isn't to be called in
4425 * atomic contexts and is allowed to schedule (with the special case
4426 * of oops_in_progress, but that isn't of any concern for this
4427 * function. --BenH.
4428 */
4429 might_sleep();
4430
4431 /* This isn't perfectly race free, but a race here would be mostly harmless,
22fce66c 4432 * at worst, we'll do a spurious blank and it's unlikely
1da177e4
LT		 4433 */
4434 del_timer(&console_timer);
4435 blank_timer_expired = 0;
4436
4437 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4438 return;
4439 if (console_blanked)
4440 unblank_screen();
4441 else if (blankinterval) {
f324edc8 4442 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4443 blank_state = blank_normal_wait;
4444 }
4445}
4446
4447/*
4448 * Palettes
4449 */
4450
4451static void set_palette(struct vc_data *vc)
4452{
4453 WARN_CONSOLE_UNLOCKED();
4454
709280da 4455 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4456 vc->vc_sw->con_set_palette(vc, color_table);
4457}
4458
1da177e4
LT		 4459/*
4460 * Load palette into the DAC registers. arg points to a colour
4461 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4462 */
4463
4464int con_set_cmap(unsigned char __user *arg)
4465{
871bdea6
MG		 4466 int i, j, k;
4467 unsigned char colormap[3*16];
4468
4469 if (copy_from_user(colormap, arg, sizeof(colormap)))
4470 return -EFAULT;
1da177e4 4471
ac751efa 4472 console_lock();
871bdea6
MG		 4473 for (i = k = 0; i < 16; i++) {
4474 default_red[i] = colormap[k++];
4475 default_grn[i] = colormap[k++];
4476 default_blu[i] = colormap[k++];
4477 }
4478 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4479 if (!vc_cons_allocated(i))
4480 continue;
4481 for (j = k = 0; j < 16; j++) {
4482 vc_cons[i].d->vc_palette[k++] = default_red[j];
4483 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4484 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4485 }
4486 set_palette(vc_cons[i].d);
4487 }
ac751efa 4488 console_unlock();
1da177e4 4489
871bdea6 4490 return 0;
1da177e4
LT		 4491}
4492
4493int con_get_cmap(unsigned char __user *arg)
4494{
871bdea6
MG		 4495 int i, k;
4496 unsigned char colormap[3*16];
1da177e4 4497
ac751efa 4498 console_lock();
871bdea6
MG		 4499 for (i = k = 0; i < 16; i++) {
4500 colormap[k++] = default_red[i];
4501 colormap[k++] = default_grn[i];
4502 colormap[k++] = default_blu[i];
4503 }
ac751efa 4504 console_unlock();
1da177e4 4505
871bdea6
MG		 4506 if (copy_to_user(arg, colormap, sizeof(colormap)))
4507 return -EFAULT;
4508
4509 return 0;
1da177e4
LT		 4510}
4511
4512void reset_palette(struct vc_data *vc)
4513{
4514 int j, k;
4515 for (j=k=0; j<16; j++) {
4516 vc->vc_palette[k++] = default_red[j];
4517 vc->vc_palette[k++] = default_grn[j];
4518 vc->vc_palette[k++] = default_blu[j];
4519 }
4520 set_palette(vc);
4521}
4522
4523/*
4524 * Font switching
4525 *
05e2600c
ST		 4526 * Currently we only support fonts up to 128 pixels wide, at a maximum height
4527 * of 128 pixels. Userspace fontdata may have to be stored with 32 bytes
4528 * (shorts/ints, depending on width) reserved for each character which is
4529 * kinda wasty, but this is done in order to maintain compatibility with the
4530 * EGA/VGA fonts. It is up to the actual low-level console-driver convert data
4531 * into its favorite format (maybe we should add a `fontoffset' field to the
4532 * `display' structure so we won't have to convert the fontdata all the time.
1da177e4
LT		 4533 * /Jes
4534 */
4535
05e2600c
ST		 4536#define max_font_width 64
4537#define max_font_height 128
4538#define max_font_glyphs 512
4539#define max_font_size (max_font_glyphs*max_font_width*max_font_height)
1da177e4
LT		 4540
4541static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4542{
4543 struct console_font font;
4544 int rc = -EINVAL;
4545 int c;
24d69384 4546 unsigned int vpitch = op->op == KD_FONT_OP_GET_TALL ? op->height : 32;
1da177e4 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);
4792
1da177e4
LT		 4793/*
4794 * Visible symbols for modules
4795 */
4796
4797EXPORT_SYMBOL(color_table);
4798EXPORT_SYMBOL(default_red);
4799EXPORT_SYMBOL(default_grn);
4800EXPORT_SYMBOL(default_blu);
4801EXPORT_SYMBOL(update_region);
4802EXPORT_SYMBOL(redraw_screen);
4803EXPORT_SYMBOL(vc_resize);
4804EXPORT_SYMBOL(fg_console);
4805EXPORT_SYMBOL(console_blank_hook);
4806EXPORT_SYMBOL(console_blanked);
4807EXPORT_SYMBOL(vc_cons);
f6c06b68 4808EXPORT_SYMBOL(global_cursor_default);
1da177e4 4809#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4810EXPORT_SYMBOL(give_up_console);
4811#endif
Linux 6.x block layer and io_uring tree(s)