]> git.ipfire.org Git - thirdparty/linux.git/blame - drivers/tty/vt/vt.c
projects / thirdparty / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
vt: perform safe console erase in the right order
[thirdparty/linux.git] / drivers / tty / vt / vt.c
CommitLineData
e3b3d0f5 1// SPDX-License-Identifier: GPL-2.0
1da177e4 2/*
1da177e4
LT		 3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 61 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
d4328b40
AT		 65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
3f07c014 76#include <linux/sched/signal.h>
1da177e4
LT		 77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
84#include <linux/major.h>
85#include <linux/mm.h>
86#include <linux/console.h>
87#include <linux/init.h>
c831c338 88#include <linux/mutex.h>
1da177e4
LT		 89#include <linux/vt_kern.h>
90#include <linux/selection.h>
91#include <linux/tiocl.h>
92#include <linux/kbd_kern.h>
93#include <linux/consolemap.h>
94#include <linux/timer.h>
95#include <linux/interrupt.h>
1da177e4 96#include <linux/workqueue.h>
1da177e4
LT		 97#include <linux/pm.h>
98#include <linux/font.h>
99#include <linux/bitops.h>
b293d758 100#include <linux/notifier.h>
d81ed103
AC		 101#include <linux/device.h>
102#include <linux/io.h>
d81ed103 103#include <linux/uaccess.h>
81d44507 104#include <linux/kdb.h>
74c807ce 105#include <linux/ctype.h>
f0a8d84f 106#include <linux/bsearch.h>
d541ae4e 107#include <linux/gcd.h>
1da177e4 108
3e795de7 109#define MAX_NR_CON_DRIVER 16
1da177e4 110
6db4063c 111#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 112#define CON_DRIVER_FLAG_INIT 2
113#define CON_DRIVER_FLAG_ATTR 4
d364b5c3 114#define CON_DRIVER_FLAG_ZOMBIE 8
3e795de7
AD		 115
116struct con_driver {
117 const struct consw *con;
118 const char *desc;
805952a8 119 struct device *dev;
6db4063c 120 int node;
3e795de7
AD		 121 int first;
122 int last;
123 int flag;
124};
125
126static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 127const struct consw *conswitchp;
128
129/* A bitmap for codes <32. A bit of 1 indicates that the code
130 * corresponding to that bit number invokes some special action
131 * (such as cursor movement) and should not be displayed as a
132 * glyph unless the disp_ctrl mode is explicitly enabled.
133 */
134#define CTRL_ACTION 0x0d00ff81
135#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
136
137/*
138 * Here is the default bell parameters: 750HZ, 1/8th of a second
139 */
140#define DEFAULT_BELL_PITCH 750
141#define DEFAULT_BELL_DURATION (HZ/8)
bd63364c 142#define DEFAULT_CURSOR_BLINK_MS 200
1da177e4 143
1da177e4
LT		 144struct vc vc_cons [MAX_NR_CONSOLES];
145
146#ifndef VT_SINGLE_DRIVER
147static const struct consw *con_driver_map[MAX_NR_CONSOLES];
148#endif
149
150static int con_open(struct tty_struct *, struct file *);
151static void vc_init(struct vc_data *vc, unsigned int rows,
152 unsigned int cols, int do_clear);
153static void gotoxy(struct vc_data *vc, int new_x, int new_y);
154static void save_cur(struct vc_data *vc);
155static void reset_terminal(struct vc_data *vc, int do_clear);
156static void con_flush_chars(struct tty_struct *tty);
403aac96 157static int set_vesa_blanking(char __user *p);
1da177e4
LT		 158static void set_cursor(struct vc_data *vc);
159static void hide_cursor(struct vc_data *vc);
65f27f38 160static void console_callback(struct work_struct *ignored);
d364b5c3 161static void con_driver_unregister_callback(struct work_struct *ignored);
24ed960a 162static void blank_screen_t(struct timer_list *unused);
1da177e4
LT		 163static void set_palette(struct vc_data *vc);
164
52c40fca
PH		 165#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
166
1da177e4 167static int printable; /* Is console ready for printing? */
77bf2bab 168int default_utf8 = true;
042f10ec 169module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 170int global_cursor_default = -1;
171module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 172
9ea9a886
CL		 173static int cur_default = CUR_DEFAULT;
174module_param(cur_default, int, S_IRUGO | S_IWUSR);
175
1da177e4
LT		 176/*
177 * ignore_poke: don't unblank the screen when things are typed. This is
178 * mainly for the privacy of braille terminal users.
179 */
180static int ignore_poke;
181
182int do_poke_blanked_console;
183int console_blanked;
184
185static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 186static int vesa_off_interval;
a4199f5e 187static int blankinterval;
f324edc8 188core_param(consoleblank, blankinterval, int, 0444);
1da177e4 189
65f27f38 190static DECLARE_WORK(console_work, console_callback);
d364b5c3 191static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
1da177e4
LT		 192
193/*
194 * fg_console is the current virtual console,
195 * last_console is the last used one,
196 * want_console is the console we want to switch to,
b45cfba4 197 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 198 */
199int fg_console;
200int last_console;
201int want_console = -1;
fed891c8
JW		 202static int saved_fg_console;
203static int saved_last_console;
204static int saved_want_console;
205static int saved_vc_mode;
beed5336 206static int saved_console_blanked;
1da177e4
LT		 207
208/*
209 * For each existing display, we have a pointer to console currently visible
210 * on that display, allowing consoles other than fg_console to be refreshed
211 * appropriately. Unless the low-level driver supplies its own display_fg
212 * variable, we use this one for the "master display".
213 */
214static struct vc_data *master_display_fg;
215
216/*
217 * Unfortunately, we need to delay tty echo when we're currently writing to the
218 * console since the code is (and always was) not re-entrant, so we schedule
219 * all flip requests to process context with schedule-task() and run it from
220 * console_callback().
221 */
222
223/*
224 * For the same reason, we defer scrollback to the console callback.
225 */
226static int scrollback_delta;
227
228/*
229 * Hook so that the power management routines can (un)blank
230 * the console on our behalf.
231 */
232int (*console_blank_hook)(int);
233
1d27e3e2 234static DEFINE_TIMER(console_timer, blank_screen_t);
1da177e4
LT		 235static int blank_state;
236static int blank_timer_expired;
237enum {
238 blank_off = 0,
239 blank_normal_wait,
240 blank_vesa_wait,
241};
242
fbc92a34
KS		 243/*
244 * /sys/class/tty/tty0/
245 *
246 * the attribute 'active' contains the name of the current vc
247 * console and it supports poll() to detect vc switches
248 */
249static struct device *tty0dev;
250
b293d758
ST		 251/*
252 * Notifier list for console events.
253 */
254static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
255
256int register_vt_notifier(struct notifier_block *nb)
257{
258 return atomic_notifier_chain_register(&vt_notifier_list, nb);
259}
260EXPORT_SYMBOL_GPL(register_vt_notifier);
261
262int unregister_vt_notifier(struct notifier_block *nb)
263{
264 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
265}
266EXPORT_SYMBOL_GPL(unregister_vt_notifier);
267
268static void notify_write(struct vc_data *vc, unsigned int unicode)
269{
502fcb79 270 struct vt_notifier_param param = { .vc = vc, .c = unicode };
b293d758
ST		 271 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
272}
273
274static void notify_update(struct vc_data *vc)
275{
276 struct vt_notifier_param param = { .vc = vc };
277 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
278}
1da177e4
LT		 279/*
280 * Low-Level Functions
281 */
282
6ca8dfd7
JS		 283static inline bool con_is_fg(const struct vc_data *vc)
284{
285 return vc->vc_num == fg_console;
286}
287
288static inline bool con_should_update(const struct vc_data *vc)
289{
290 return con_is_visible(vc) && !console_blanked;
291}
1da177e4
LT		 292
293static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
294{
295 unsigned short *p;
296
297 if (!viewed)
298 p = (unsigned short *)(vc->vc_origin + offset);
299 else if (!vc->vc_sw->con_screen_pos)
300 p = (unsigned short *)(vc->vc_visible_origin + offset);
301 else
302 p = vc->vc_sw->con_screen_pos(vc, offset);
303 return p;
304}
305
e33ac1c1 306/* Called from the keyboard irq path.. */
1da177e4
LT		 307static inline void scrolldelta(int lines)
308{
e33ac1c1
AC		 309 /* FIXME */
310 /* scrolldelta needs some kind of consistency lock, but the BKL was
311 and still is not protecting versus the scheduled back end */
1da177e4
LT		 312 scrollback_delta += lines;
313 schedule_console_callback();
314}
315
316void schedule_console_callback(void)
317{
318 schedule_work(&console_work);
319}
320
d8ae7242
NP		 321/*
322 * Code to manage unicode-based screen buffers
323 */
324
325#ifdef NO_VC_UNI_SCREEN
326/* this disables and optimizes related code away at compile time */
327#define get_vc_uniscr(vc) NULL
328#else
329#define get_vc_uniscr(vc) vc->vc_uni_screen
330#endif
331
0224080f
NP		 332#define VC_UNI_SCREEN_DEBUG 0
333
d8ae7242
NP		 334typedef uint32_t char32_t;
335
336/*
337 * Our screen buffer is preceded by an array of line pointers so that
338 * scrolling only implies some pointer shuffling.
339 */
340struct uni_screen {
341 char32_t *lines[0];
342};
343
344static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
345{
346 struct uni_screen *uniscr;
347 void *p;
348 unsigned int memsize, i;
349
350 /* allocate everything in one go */
351 memsize = cols * rows * sizeof(char32_t);
352 memsize += rows * sizeof(char32_t *);
353 p = kmalloc(memsize, GFP_KERNEL);
354 if (!p)
355 return NULL;
356
357 /* initial line pointers */
358 uniscr = p;
359 p = uniscr->lines + rows;
360 for (i = 0; i < rows; i++) {
361 uniscr->lines[i] = p;
362 p += cols * sizeof(char32_t);
363 }
364 return uniscr;
365}
366
367static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
368{
369 kfree(vc->vc_uni_screen);
370 vc->vc_uni_screen = new_uniscr;
371}
372
373static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
374{
375 struct uni_screen *uniscr = get_vc_uniscr(vc);
376
377 if (uniscr)
378 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
379}
380
381static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
382{
383 struct uni_screen *uniscr = get_vc_uniscr(vc);
384
385 if (uniscr) {
386 char32_t *ln = uniscr->lines[vc->vc_y];
387 unsigned int x = vc->vc_x, cols = vc->vc_cols;
388
389 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
390 memset32(&ln[x], ' ', nr);
391 }
392}
393
394static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
395{
396 struct uni_screen *uniscr = get_vc_uniscr(vc);
397
398 if (uniscr) {
399 char32_t *ln = uniscr->lines[vc->vc_y];
400 unsigned int x = vc->vc_x, cols = vc->vc_cols;
401
402 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
403 memset32(&ln[cols - nr], ' ', nr);
404 }
405}
406
407static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
408 unsigned int nr)
409{
410 struct uni_screen *uniscr = get_vc_uniscr(vc);
411
412 if (uniscr) {
413 char32_t *ln = uniscr->lines[vc->vc_y];
414
415 memset32(&ln[x], ' ', nr);
416 }
417}
418
419static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
420 unsigned int nr)
421{
422 struct uni_screen *uniscr = get_vc_uniscr(vc);
423
424 if (uniscr) {
425 unsigned int cols = vc->vc_cols;
426
427 while (nr--)
428 memset32(uniscr->lines[y++], ' ', cols);
429 }
430}
431
432static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
433 enum con_scroll dir, unsigned int nr)
434{
435 struct uni_screen *uniscr = get_vc_uniscr(vc);
436
437 if (uniscr) {
d541ae4e
NP		 438 unsigned int i, j, k, sz, d, clear;
439
440 sz = b - t;
441 clear = b - nr;
442 d = nr;
443 if (dir == SM_DOWN) {
444 clear = t;
445 d = sz - nr;
446 }
447 for (i = 0; i < gcd(d, sz); i++) {
448 char32_t *tmp = uniscr->lines[t + i];
449 j = i;
450 while (1) {
451 k = j + d;
452 if (k >= sz)
453 k -= sz;
454 if (k == i)
455 break;
456 uniscr->lines[t + j] = uniscr->lines[t + k];
457 j = k;
458 }
459 uniscr->lines[t + j] = tmp;
d8ae7242 460 }
d8ae7242
NP		 461 vc_uniscr_clear_lines(vc, clear, nr);
462 }
463}
464
465static void vc_uniscr_copy_area(struct uni_screen *dst,
466 unsigned int dst_cols,
467 unsigned int dst_rows,
468 struct uni_screen *src,
469 unsigned int src_cols,
470 unsigned int src_top_row,
471 unsigned int src_bot_row)
472{
473 unsigned int dst_row = 0;
474
475 if (!dst)
476 return;
477
478 while (src_top_row < src_bot_row) {
479 char32_t *src_line = src->lines[src_top_row];
480 char32_t *dst_line = dst->lines[dst_row];
481
482 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
483 if (dst_cols - src_cols)
484 memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
485 src_top_row++;
486 dst_row++;
487 }
488 while (dst_row < dst_rows) {
489 char32_t *dst_line = dst->lines[dst_row];
490
491 memset32(dst_line, ' ', dst_cols);
492 dst_row++;
493 }
494}
495
d21b0be2
NP		 496/*
497 * Called from vcs_read() to make sure unicode screen retrieval is possible.
498 * This will initialize the unicode screen buffer if not already done.
499 * This returns 0 if OK, or a negative error code otherwise.
500 * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
501 */
502int vc_uniscr_check(struct vc_data *vc)
503{
504 struct uni_screen *uniscr;
505 unsigned short *p;
506 int x, y, mask;
507
508 if (__is_defined(NO_VC_UNI_SCREEN))
509 return -EOPNOTSUPP;
510
511 WARN_CONSOLE_UNLOCKED();
512
513 if (!vc->vc_utf)
514 return -ENODATA;
515
516 if (vc->vc_uni_screen)
517 return 0;
518
519 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
520 if (!uniscr)
521 return -ENOMEM;
522
523 /*
524 * Let's populate it initially with (imperfect) reverse translation.
525 * This is the next best thing we can do short of having it enabled
526 * from the start even when no users rely on this functionality. True
527 * unicode content will be available after a complete screen refresh.
528 */
529 p = (unsigned short *)vc->vc_origin;
530 mask = vc->vc_hi_font_mask | 0xff;
531 for (y = 0; y < vc->vc_rows; y++) {
532 char32_t *line = uniscr->lines[y];
533 for (x = 0; x < vc->vc_cols; x++) {
534 u16 glyph = scr_readw(p++) & mask;
535 line[x] = inverse_translate(vc, glyph, true);
536 }
537 }
538
539 vc->vc_uni_screen = uniscr;
540 return 0;
541}
542
543/*
544 * Called from vcs_read() to get the unicode data from the screen.
545 * This must be preceded by a successful call to vc_uniscr_check() once
546 * the console lock has been taken.
547 */
708d0bff 548void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
d21b0be2
NP		 549 unsigned int row, unsigned int col, unsigned int nr)
550{
551 struct uni_screen *uniscr = get_vc_uniscr(vc);
708d0bff
NP		 552 int offset = row * vc->vc_size_row + col * 2;
553 unsigned long pos;
d21b0be2
NP		 554
555 BUG_ON(!uniscr);
708d0bff
NP		 556
557 pos = (unsigned long)screenpos(vc, offset, viewed);
558 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
559 /*
560 * Desired position falls in the main screen buffer.
561 * However the actual row/col might be different if
562 * scrollback is active.
563 */
564 row = (pos - vc->vc_origin) / vc->vc_size_row;
565 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
566 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
567 } else {
568 /*
569 * Scrollback is active. For now let's simply backtranslate
570 * the screen glyphs until the unicode screen buffer does
571 * synchronize with console display drivers for a scrollback
572 * buffer of its own.
573 */
574 u16 *p = (u16 *)pos;
575 int mask = vc->vc_hi_font_mask | 0xff;
576 char32_t *uni_buf = dest;
577 while (nr--) {
578 u16 glyph = scr_readw(p++) & mask;
579 *uni_buf++ = inverse_translate(vc, glyph, true);
580 }
581 }
d21b0be2
NP		 582}
583
0224080f
NP		 584/* this is for validation and debugging only */
585static void vc_uniscr_debug_check(struct vc_data *vc)
586{
587 struct uni_screen *uniscr = get_vc_uniscr(vc);
588 unsigned short *p;
589 int x, y, mask;
590
591 if (!VC_UNI_SCREEN_DEBUG || !uniscr)
592 return;
593
594 WARN_CONSOLE_UNLOCKED();
595
596 /*
597 * Make sure our unicode screen translates into the same glyphs
598 * as the actual screen. This is brutal indeed.
599 */
600 p = (unsigned short *)vc->vc_origin;
601 mask = vc->vc_hi_font_mask | 0xff;
602 for (y = 0; y < vc->vc_rows; y++) {
603 char32_t *line = uniscr->lines[y];
604 for (x = 0; x < vc->vc_cols; x++) {
605 u16 glyph = scr_readw(p++) & mask;
606 char32_t uc = line[x];
607 int tc = conv_uni_to_pc(vc, uc);
608 if (tc == -4)
609 tc = conv_uni_to_pc(vc, 0xfffd);
610 if (tc == -4)
611 tc = conv_uni_to_pc(vc, '?');
612 if (tc != glyph)
613 pr_err_ratelimited(
614 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
615 __func__, x, y, glyph, tc);
616 }
617 }
618}
619
d8ae7242 620
89765b94
JS		 621static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
622 enum con_scroll dir, unsigned int nr)
1da177e4 623{
89765b94 624 u16 *clear, *d, *s;
1da177e4 625
89765b94 626 if (t + nr >= b)
1da177e4
LT		 627 nr = b - t - 1;
628 if (b > vc->vc_rows || t >= b || nr < 1)
629 return;
d8ae7242 630 vc_uniscr_scroll(vc, t, b, dir, nr);
89765b94 631 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
1da177e4 632 return;
1da177e4 633
89765b94
JS		 634 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
635 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
1da177e4 636
89765b94
JS		 637 if (dir == SM_UP) {
638 clear = s + (b - t - nr) * vc->vc_cols;
639 swap(s, d);
640 }
641 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
642 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
1da177e4
LT		 643}
644
645static void do_update_region(struct vc_data *vc, unsigned long start, int count)
646{
1da177e4
LT		 647 unsigned int xx, yy, offset;
648 u16 *p;
649
650 p = (u16 *) start;
651 if (!vc->vc_sw->con_getxy) {
652 offset = (start - vc->vc_origin) / 2;
653 xx = offset % vc->vc_cols;
654 yy = offset / vc->vc_cols;
655 } else {
656 int nxx, nyy;
657 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
658 xx = nxx; yy = nyy;
659 }
660 for(;;) {
661 u16 attrib = scr_readw(p) & 0xff00;
662 int startx = xx;
663 u16 *q = p;
664 while (xx < vc->vc_cols && count) {
665 if (attrib != (scr_readw(p) & 0xff00)) {
666 if (p > q)
667 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
668 startx = xx;
669 q = p;
670 attrib = scr_readw(p) & 0xff00;
671 }
672 p++;
673 xx++;
674 count--;
675 }
676 if (p > q)
677 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
678 if (!count)
679 break;
680 xx = 0;
681 yy++;
682 if (vc->vc_sw->con_getxy) {
683 p = (u16 *)start;
684 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
685 }
686 }
1da177e4
LT		 687}
688
689void update_region(struct vc_data *vc, unsigned long start, int count)
690{
691 WARN_CONSOLE_UNLOCKED();
692
6ca8dfd7 693 if (con_should_update(vc)) {
1da177e4
LT		 694 hide_cursor(vc);
695 do_update_region(vc, start, count);
696 set_cursor(vc);
697 }
698}
699
700/* Structure of attributes is hardware-dependent */
701
fa6ce9ab
JE		 702static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
703 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 704{
705 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 706 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
707 _blink, _underline, _reverse, _italic);
1da177e4 708
1da177e4
LT		 709/*
710 * ++roman: I completely changed the attribute format for monochrome
711 * mode (!can_do_color). The formerly used MDA (monochrome display
712 * adapter) format didn't allow the combination of certain effects.
713 * Now the attribute is just a bit vector:
714 * Bit 0..1: intensity (0..2)
715 * Bit 2 : underline
716 * Bit 3 : reverse
717 * Bit 7 : blink
718 */
719 {
c9e587ab 720 u8 a = _color;
1da177e4
LT		 721 if (!vc->vc_can_do_color)
722 return _intensity |
fa6ce9ab 723 (_italic ? 2 : 0) |
1da177e4
LT		 724 (_underline ? 4 : 0) |
725 (_reverse ? 8 : 0) |
726 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 727 if (_italic)
728 a = (a & 0xF0) | vc->vc_itcolor;
729 else if (_underline)
1da177e4
LT		 730 a = (a & 0xf0) | vc->vc_ulcolor;
731 else if (_intensity == 0)
1c65a879 732 a = (a & 0xf0) | vc->vc_halfcolor;
1da177e4
LT		 733 if (_reverse)
734 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
735 if (_blink)
736 a ^= 0x80;
737 if (_intensity == 2)
738 a ^= 0x08;
739 if (vc->vc_hi_font_mask == 0x100)
740 a <<= 1;
741 return a;
742 }
1da177e4
LT		 743}
744
745static void update_attr(struct vc_data *vc)
746{
fa6ce9ab
JE		 747 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
748 vc->vc_blink, vc->vc_underline,
749 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
750 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 751}
752
753/* Note: inverting the screen twice should revert to the original state */
754void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
755{
756 unsigned short *p;
757
758 WARN_CONSOLE_UNLOCKED();
759
760 count /= 2;
761 p = screenpos(vc, offset, viewed);
6af39ed3 762 if (vc->vc_sw->con_invert_region) {
1da177e4 763 vc->vc_sw->con_invert_region(vc, p, count);
6af39ed3 764 } else {
1da177e4
LT		 765 u16 *q = p;
766 int cnt = count;
767 u16 a;
768
769 if (!vc->vc_can_do_color) {
770 while (cnt--) {
771 a = scr_readw(q);
772 a ^= 0x0800;
773 scr_writew(a, q);
774 q++;
775 }
776 } else if (vc->vc_hi_font_mask == 0x100) {
777 while (cnt--) {
778 a = scr_readw(q);
779 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
780 scr_writew(a, q);
781 q++;
782 }
783 } else {
784 while (cnt--) {
785 a = scr_readw(q);
786 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
787 scr_writew(a, q);
788 q++;
789 }
790 }
791 }
6af39ed3 792
6ca8dfd7 793 if (con_should_update(vc))
1da177e4 794 do_update_region(vc, (unsigned long) p, count);
19e3ae6b 795 notify_update(vc);
1da177e4
LT		 796}
797
798/* used by selection: complement pointer position */
799void complement_pos(struct vc_data *vc, int offset)
800{
414edcd3 801 static int old_offset = -1;
1da177e4
LT		 802 static unsigned short old;
803 static unsigned short oldx, oldy;
804
805 WARN_CONSOLE_UNLOCKED();
806
414edcd3
AD		 807 if (old_offset != -1 && old_offset >= 0 &&
808 old_offset < vc->vc_screenbuf_size) {
809 scr_writew(old, screenpos(vc, old_offset, 1));
6ca8dfd7 810 if (con_should_update(vc))
1da177e4 811 vc->vc_sw->con_putc(vc, old, oldy, oldx);
19e3ae6b 812 notify_update(vc);
1da177e4 813 }
414edcd3
AD		 814
815 old_offset = offset;
816
817 if (offset != -1 && offset >= 0 &&
818 offset < vc->vc_screenbuf_size) {
1da177e4 819 unsigned short new;
414edcd3 820 unsigned short *p;
1da177e4
LT		 821 p = screenpos(vc, offset, 1);
822 old = scr_readw(p);
823 new = old ^ vc->vc_complement_mask;
824 scr_writew(new, p);
6ca8dfd7 825 if (con_should_update(vc)) {
1da177e4
LT		 826 oldx = (offset >> 1) % vc->vc_cols;
827 oldy = (offset >> 1) / vc->vc_cols;
828 vc->vc_sw->con_putc(vc, new, oldy, oldx);
829 }
19e3ae6b 830 notify_update(vc);
1da177e4
LT		 831 }
832}
833
834static void insert_char(struct vc_data *vc, unsigned int nr)
835{
81732c3b 836 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 837
d8ae7242 838 vc_uniscr_insert(vc, nr);
a883b70d 839 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b 840 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
1da177e4 841 vc->vc_need_wrap = 0;
6ca8dfd7 842 if (con_should_update(vc))
81732c3b 843 do_update_region(vc, (unsigned long) p,
b1a925f4 844 vc->vc_cols - vc->vc_x);
1da177e4
LT		 845}
846
847static void delete_char(struct vc_data *vc, unsigned int nr)
848{
81732c3b 849 unsigned short *p = (unsigned short *) vc->vc_pos;
1da177e4 850
d8ae7242 851 vc_uniscr_delete(vc, nr);
b1a925f4 852 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
81732c3b
JFM		 853 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
854 nr * 2);
1da177e4 855 vc->vc_need_wrap = 0;
6ca8dfd7 856 if (con_should_update(vc))
81732c3b 857 do_update_region(vc, (unsigned long) p,
b1a925f4 858 vc->vc_cols - vc->vc_x);
1da177e4
LT		 859}
860
e882f715 861static int softcursor_original = -1;
1da177e4
LT		 862
863static void add_softcursor(struct vc_data *vc)
864{
865 int i = scr_readw((u16 *) vc->vc_pos);
866 u32 type = vc->vc_cursor_type;
867
868 if (! (type & 0x10)) return;
869 if (softcursor_original != -1) return;
870 softcursor_original = i;
871 i |= ((type >> 8) & 0xff00 );
872 i ^= ((type) & 0xff00 );
873 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
874 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
875 scr_writew(i, (u16 *) vc->vc_pos);
6ca8dfd7 876 if (con_should_update(vc))
1da177e4
LT		 877 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
878}
879
880static void hide_softcursor(struct vc_data *vc)
881{
882 if (softcursor_original != -1) {
883 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
6ca8dfd7 884 if (con_should_update(vc))
1da177e4
LT		 885 vc->vc_sw->con_putc(vc, softcursor_original,
886 vc->vc_y, vc->vc_x);
887 softcursor_original = -1;
888 }
889}
890
891static void hide_cursor(struct vc_data *vc)
892{
893 if (vc == sel_cons)
894 clear_selection();
895 vc->vc_sw->con_cursor(vc, CM_ERASE);
896 hide_softcursor(vc);
897}
898
899static void set_cursor(struct vc_data *vc)
900{
6ca8dfd7 901 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
1da177e4
LT		 902 return;
903 if (vc->vc_deccm) {
904 if (vc == sel_cons)
905 clear_selection();
906 add_softcursor(vc);
907 if ((vc->vc_cursor_type & 0x0f) != 1)
908 vc->vc_sw->con_cursor(vc, CM_DRAW);
909 } else
910 hide_cursor(vc);
911}
912
913static void set_origin(struct vc_data *vc)
914{
915 WARN_CONSOLE_UNLOCKED();
916
6ca8dfd7 917 if (!con_is_visible(vc) ||
1da177e4
LT		 918 !vc->vc_sw->con_set_origin ||
919 !vc->vc_sw->con_set_origin(vc))
920 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
921 vc->vc_visible_origin = vc->vc_origin;
922 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
923 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
924}
925
c0f160a7 926static void save_screen(struct vc_data *vc)
1da177e4
LT		 927{
928 WARN_CONSOLE_UNLOCKED();
929
930 if (vc->vc_sw->con_save_screen)
931 vc->vc_sw->con_save_screen(vc);
932}
933
bcd375f7
MS		 934static void flush_scrollback(struct vc_data *vc)
935{
936 WARN_CONSOLE_UNLOCKED();
937
a6dbe442 938 set_origin(vc);
bcd375f7
MS		 939 if (vc->vc_sw->con_flush_scrollback)
940 vc->vc_sw->con_flush_scrollback(vc);
a6dbe442
NP		 941 else
942 vc->vc_sw->con_switch(vc);
bcd375f7
MS		 943}
944
1da177e4
LT		 945/*
946 * Redrawing of screen
947 */
948
2a248307 949void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 950{
951 unsigned short *p = (unsigned short *)vc->vc_origin;
952 int count = vc->vc_screenbuf_size / 2;
953 int mask = vc->vc_hi_font_mask | 0xff;
954
955 for (; count > 0; count--, p++) {
956 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
957 }
958}
959
960void redraw_screen(struct vc_data *vc, int is_switch)
961{
962 int redraw = 0;
963
964 WARN_CONSOLE_UNLOCKED();
965
966 if (!vc) {
967 /* strange ... */
968 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
969 return;
970 }
971
972 if (is_switch) {
973 struct vc_data *old_vc = vc_cons[fg_console].d;
974 if (old_vc == vc)
975 return;
6ca8dfd7 976 if (!con_is_visible(vc))
1da177e4
LT		 977 redraw = 1;
978 *vc->vc_display_fg = vc;
979 fg_console = vc->vc_num;
980 hide_cursor(old_vc);
6ca8dfd7 981 if (!con_is_visible(old_vc)) {
1da177e4
LT		 982 save_screen(old_vc);
983 set_origin(old_vc);
984 }
fbc92a34
KS		 985 if (tty0dev)
986 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 987 } else {
988 hide_cursor(vc);
989 redraw = 1;
990 }
991
992 if (redraw) {
993 int update;
994 int old_was_color = vc->vc_can_do_color;
995
996 set_origin(vc);
997 update = vc->vc_sw->con_switch(vc);
998 set_palette(vc);
999 /*
1000 * If console changed from mono<->color, the best we can do
1001 * is to clear the buffer attributes. As it currently stands,
1002 * rebuilding new attributes from the old buffer is not doable
1003 * without overly complex code.
1004 */
1005 if (old_was_color != vc->vc_can_do_color) {
1006 update_attr(vc);
1007 clear_buffer_attributes(vc);
1008 }
8fd4bd22 1009
8d7fc299 1010 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 1011 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1012 }
1013 set_cursor(vc);
1014 if (is_switch) {
1015 set_leds();
1016 compute_shiftstate();
8182ec49 1017 notify_update(vc);
1da177e4
LT		 1018 }
1019}
1020
1021/*
1022 * Allocation, freeing and resizing of VTs.
1023 */
1024
1025int vc_cons_allocated(unsigned int i)
1026{
1027 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1028}
1029
1030static void visual_init(struct vc_data *vc, int num, int init)
1031{
1032 /* ++Geert: vc->vc_sw->con_init determines console size */
1033 if (vc->vc_sw)
1034 module_put(vc->vc_sw->owner);
1035 vc->vc_sw = conswitchp;
1036#ifndef VT_SINGLE_DRIVER
1037 if (con_driver_map[num])
1038 vc->vc_sw = con_driver_map[num];
1039#endif
1040 __module_get(vc->vc_sw->owner);
1041 vc->vc_num = num;
1042 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 1043 if (vc->vc_uni_pagedir_loc)
1044 con_free_unimap(vc);
1da177e4 1045 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 1046 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 1047 vc->vc_hi_font_mask = 0;
1048 vc->vc_complement_mask = 0;
1049 vc->vc_can_do_color = 0;
1b45996d 1050 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1051 vc->vc_sw->con_init(vc, init);
1052 if (!vc->vc_complement_mask)
1053 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1054 vc->vc_s_complement_mask = vc->vc_complement_mask;
1055 vc->vc_size_row = vc->vc_cols << 1;
1056 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1057}
1058
1059int vc_allocate(unsigned int currcons) /* return 0 on success */
1060{
34902b7f
JS		 1061 struct vt_notifier_param param;
1062 struct vc_data *vc;
1063
1da177e4
LT		 1064 WARN_CONSOLE_UNLOCKED();
1065
1066 if (currcons >= MAX_NR_CONSOLES)
1067 return -ENXIO;
34902b7f
JS		 1068
1069 if (vc_cons[currcons].d)
1070 return 0;
1071
1072 /* due to the granularity of kmalloc, we waste some memory here */
1073 /* the alloc is done in two steps, to optimize the common situation
1074 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1075 /* although the numbers above are not valid since long ago, the
1076 point is still up-to-date and the comment still has its value
1077 even if only as a historical artifact. --mj, July 1998 */
1078 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1079 if (!vc)
1da177e4 1080 return -ENOMEM;
34902b7f
JS		 1081
1082 vc_cons[currcons].d = vc;
1083 tty_port_init(&vc->port);
1084 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1085
1086 visual_init(vc, currcons, 1);
1087
1088 if (!*vc->vc_uni_pagedir_loc)
1da177e4 1089 con_set_default_unimap(vc);
f6c06b68 1090
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
JS		 1105err_free:
1106 kfree(vc);
1107 vc_cons[currcons].d = NULL;
1108 return -ENOMEM;
1da177e4
LT		 1109}
1110
e400b6ec
AD		 1111static inline int resize_screen(struct vc_data *vc, int width, int height,
1112 int user)
1da177e4
LT		 1113{
1114 /* Resizes the resolution of the display adapater */
1115 int err = 0;
1116
1117 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 1118 err = vc->vc_sw->con_resize(vc, width, height, user);
1119
1da177e4
LT		 1120 return err;
1121}
1122
1123/*
1124 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1125 * [this is to be used together with some user program
1126 * like resize that changes the hardware videomode]
1127 */
1128#define VC_RESIZE_MAXCOL (32767)
1129#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 1130
1131/**
1132 * vc_do_resize - resizing method for the tty
1133 * @tty: tty being resized
1134 * @real_tty: real tty (different to tty if a pty/tty pair)
1135 * @vc: virtual console private data
1136 * @cols: columns
1137 * @lines: lines
1138 *
1139 * Resize a virtual console, clipping according to the actual constraints.
1140 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1141 * information and perform any necessary signal handling.
8c9a9dd0 1142 *
6a1c0680 1143 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 1144 * ctrl_lock of the tty IFF a tty is passed.
1145 */
1146
fc6f6238
AC		 1147static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1148 unsigned int cols, unsigned int lines)
1da177e4
LT		 1149{
1150 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1151 unsigned long end;
d8ae7242 1152 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1153 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1154 unsigned int user;
1da177e4 1155 unsigned short *newscreen;
d8ae7242 1156 struct uni_screen *new_uniscr = NULL;
1da177e4
LT		 1157
1158 WARN_CONSOLE_UNLOCKED();
1159
1160 if (!vc)
1161 return -ENXIO;
1162
e400b6ec
AD		 1163 user = vc->vc_resize_user;
1164 vc->vc_resize_user = 0;
1165
1da177e4
LT		 1166 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1167 return -EINVAL;
1168
1169 new_cols = (cols ? cols : vc->vc_cols);
1170 new_rows = (lines ? lines : vc->vc_rows);
1171 new_row_size = new_cols << 1;
1172 new_screen_size = new_row_size * new_rows;
1173
1174 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1175 return 0;
1176
32b2921e
DV		 1177 if (new_screen_size > (4 << 20))
1178 return -EINVAL;
21eff69a 1179 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1180 if (!newscreen)
1181 return -ENOMEM;
1182
d8ae7242
NP		 1183 if (get_vc_uniscr(vc)) {
1184 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1185 if (!new_uniscr) {
1186 kfree(newscreen);
1187 return -ENOMEM;
1188 }
1189 }
1190
009e39ae
SD		 1191 if (vc == sel_cons)
1192 clear_selection();
1193
1da177e4 1194 old_rows = vc->vc_rows;
1da177e4 1195 old_row_size = vc->vc_size_row;
1da177e4 1196
e400b6ec 1197 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1198 if (err) {
1199 kfree(newscreen);
d8ae7242 1200 kfree(new_uniscr);
1da177e4
LT		 1201 return err;
1202 }
1203
1204 vc->vc_rows = new_rows;
1205 vc->vc_cols = new_cols;
1206 vc->vc_size_row = new_row_size;
1207 vc->vc_screenbuf_size = new_screen_size;
1208
1209 rlth = min(old_row_size, new_row_size);
1210 rrem = new_row_size - rlth;
1211 old_origin = vc->vc_origin;
1212 new_origin = (long) newscreen;
1213 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 1214
1215 if (vc->vc_y > new_rows) {
1216 if (old_rows - vc->vc_y < new_rows) {
1217 /*
1218 * Cursor near the bottom, copy contents from the
1219 * bottom of buffer
1220 */
d8ae7242 1221 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1222 } else {
1223 /*
1224 * Cursor is in no man's land, copy 1/2 screenful
1225 * from the top and bottom of cursor position
1226 */
d8ae7242 1227 first_copied_row = (vc->vc_y - new_rows/2);
3b41dc1a 1228 }
d8ae7242
NP		 1229 old_origin += first_copied_row * old_row_size;
1230 } else
1231 first_copied_row = 0;
9fc2b2d0 1232 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1233
d8ae7242
NP		 1234 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1235 get_vc_uniscr(vc), rlth/2, first_copied_row,
1236 min(old_rows, new_rows));
1237 vc_uniscr_set(vc, new_uniscr);
1238
1da177e4
LT		 1239 update_attr(vc);
1240
3b41dc1a
AD		 1241 while (old_origin < end) {
1242 scr_memcpyw((unsigned short *) new_origin,
1243 (unsigned short *) old_origin, rlth);
1da177e4 1244 if (rrem)
3b41dc1a
AD		 1245 scr_memsetw((void *)(new_origin + rlth),
1246 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1247 old_origin += old_row_size;
1248 new_origin += new_row_size;
1249 }
1250 if (new_scr_end > new_origin)
3b41dc1a
AD		 1251 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1252 new_scr_end - new_origin);
5c9228f0 1253 kfree(vc->vc_screenbuf);
1da177e4 1254 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1255 vc->vc_screenbuf_size = new_screen_size;
1256 set_origin(vc);
1257
1258 /* do part of a reset_terminal() */
1259 vc->vc_top = 0;
1260 vc->vc_bottom = vc->vc_rows;
1261 gotoxy(vc, vc->vc_x, vc->vc_y);
1262 save_cur(vc);
1263
8c9a9dd0
AC		 1264 if (tty) {
1265 /* Rewrite the requested winsize data with the actual
1266 resulting sizes */
1267 struct winsize ws;
1da177e4
LT		 1268 memset(&ws, 0, sizeof(ws));
1269 ws.ws_row = vc->vc_rows;
1270 ws.ws_col = vc->vc_cols;
1271 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1272 tty_do_resize(tty, &ws);
1da177e4
LT		 1273 }
1274
6ca8dfd7 1275 if (con_is_visible(vc))
1da177e4 1276 update_screen(vc);
8b92e87d 1277 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1278 notify_update(vc);
1da177e4
LT		 1279 return err;
1280}
1281
8c9a9dd0
AC		 1282/**
1283 * vc_resize - resize a VT
1284 * @vc: virtual console
1285 * @cols: columns
1286 * @rows: rows
1287 *
1288 * Resize a virtual console as seen from the console end of things. We
1289 * use the common vc_do_resize methods to update the structures. The
1290 * caller must hold the console sem to protect console internals and
8ce73264 1291 * vc->port.tty
8c9a9dd0
AC		 1292 */
1293
1294int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1295{
8ce73264 1296 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 1297}
1298
1299/**
1300 * vt_resize - resize a VT
1301 * @tty: tty to resize
8c9a9dd0
AC		 1302 * @ws: winsize attributes
1303 *
1304 * Resize a virtual terminal. This is called by the tty layer as we
1305 * register our own handler for resizing. The mutual helper does all
1306 * the actual work.
1307 *
1308 * Takes the console sem and the called methods then take the tty
6a1c0680 1309 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 1310 */
da2bdf9a 1311static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1312{
8c9a9dd0
AC		 1313 struct vc_data *vc = tty->driver_data;
1314 int ret;
ca9bda00 1315
ac751efa 1316 console_lock();
fc6f6238 1317 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1318 console_unlock();
8c9a9dd0 1319 return ret;
ca9bda00 1320}
1da177e4 1321
421b40a6 1322struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1323{
421b40a6
PH		 1324 struct vc_data *vc = NULL;
1325
1da177e4
LT		 1326 WARN_CONSOLE_UNLOCKED();
1327
1328 if (vc_cons_allocated(currcons)) {
421b40a6 1329 struct vt_notifier_param param;
4995f8ef 1330
421b40a6 1331 param.vc = vc = vc_cons[currcons].d;
b293d758 1332 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1333 vcs_remove_sysfs(currcons);
1da177e4 1334 vc->vc_sw->con_deinit(vc);
bde0d2c9 1335 put_pid(vc->vt_pid);
d459ec0b 1336 module_put(vc->vc_sw->owner);
d8ae7242 1337 vc_uniscr_set(vc, NULL);
5c9228f0 1338 kfree(vc->vc_screenbuf);
1da177e4
LT		 1339 vc_cons[currcons].d = NULL;
1340 }
421b40a6 1341 return vc;
1da177e4
LT		 1342}
1343
1344/*
1345 * VT102 emulator
1346 */
1347
2ff5c5a1
MH		 1348enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1349
079c9534
AC		 1350#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1351#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1352#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1353
1354#define decarm VC_REPEAT
1355#define decckm VC_CKMODE
1356#define kbdapplic VC_APPLIC
1357#define lnm VC_CRLF
1358
1359/*
1360 * this is what the terminal answers to a ESC-Z or csi0c query.
1361 */
1362#define VT100ID "\033[?1;2c"
1363#define VT102ID "\033[?6c"
1364
8ede5cce 1365const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1366 8,12,10,14, 9,13,11,15 };
1367
1368/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1369unsigned char default_red[] = {
1370 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1371 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1372};
1373module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1374
1375unsigned char default_grn[] = {
1376 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1377 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1378};
1379module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1380
1381unsigned char default_blu[] = {
1382 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1383 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1384};
1385module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1386
1da177e4
LT		 1387/*
1388 * gotoxy() must verify all boundaries, because the arguments
1389 * might also be negative. If the given position is out of
1390 * bounds, the cursor is placed at the nearest margin.
1391 */
1392static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1393{
1394 int min_y, max_y;
1395
1396 if (new_x < 0)
1397 vc->vc_x = 0;
1398 else {
1399 if (new_x >= vc->vc_cols)
1400 vc->vc_x = vc->vc_cols - 1;
1401 else
1402 vc->vc_x = new_x;
1403 }
1404
1405 if (vc->vc_decom) {
1406 min_y = vc->vc_top;
1407 max_y = vc->vc_bottom;
1408 } else {
1409 min_y = 0;
1410 max_y = vc->vc_rows;
1411 }
1412 if (new_y < min_y)
1413 vc->vc_y = min_y;
1414 else if (new_y >= max_y)
1415 vc->vc_y = max_y - 1;
1416 else
1417 vc->vc_y = new_y;
1418 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1419 vc->vc_need_wrap = 0;
1420}
1421
1422/* for absolute user moves, when decom is set */
1423static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1424{
1425 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1426}
1427
1b0ec88a 1428void scrollback(struct vc_data *vc)
1da177e4 1429{
1b0ec88a 1430 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1431}
1432
1433void scrollfront(struct vc_data *vc, int lines)
1434{
1435 if (!lines)
1436 lines = vc->vc_rows / 2;
1437 scrolldelta(lines);
1438}
1439
1440static void lf(struct vc_data *vc)
1441{
1442 /* don't scroll if above bottom of scrolling region, or
1443 * if below scrolling region
1444 */
1445 if (vc->vc_y + 1 == vc->vc_bottom)
89765b94 1446 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1da177e4
LT		 1447 else if (vc->vc_y < vc->vc_rows - 1) {
1448 vc->vc_y++;
1449 vc->vc_pos += vc->vc_size_row;
1450 }
1451 vc->vc_need_wrap = 0;
b293d758 1452 notify_write(vc, '\n');
1da177e4
LT		 1453}
1454
1455static void ri(struct vc_data *vc)
1456{
1457 /* don't scroll if below top of scrolling region, or
1458 * if above scrolling region
1459 */
1460 if (vc->vc_y == vc->vc_top)
89765b94 1461 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1da177e4
LT		 1462 else if (vc->vc_y > 0) {
1463 vc->vc_y--;
1464 vc->vc_pos -= vc->vc_size_row;
1465 }
1466 vc->vc_need_wrap = 0;
1467}
1468
1469static inline void cr(struct vc_data *vc)
1470{
1471 vc->vc_pos -= vc->vc_x << 1;
1472 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1473 notify_write(vc, '\r');
1da177e4
LT		 1474}
1475
1476static inline void bs(struct vc_data *vc)
1477{
1478 if (vc->vc_x) {
1479 vc->vc_pos -= 2;
1480 vc->vc_x--;
1481 vc->vc_need_wrap = 0;
b293d758 1482 notify_write(vc, '\b');
1da177e4
LT		 1483 }
1484}
1485
1486static inline void del(struct vc_data *vc)
1487{
1488 /* ignored */
1489}
1490
1491static void csi_J(struct vc_data *vc, int vpar)
1492{
1493 unsigned int count;
1494 unsigned short * start;
1495
1496 switch (vpar) {
1497 case 0: /* erase from cursor to end of display */
d8ae7242
NP		 1498 vc_uniscr_clear_line(vc, vc->vc_x,
1499 vc->vc_cols - vc->vc_x);
1500 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1501 vc->vc_rows - vc->vc_y - 1);
1da177e4
LT		 1502 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1503 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1504 break;
1505 case 1: /* erase from start to cursor */
d8ae7242
NP		 1506 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1507 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1da177e4
LT		 1508 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1509 start = (unsigned short *)vc->vc_origin;
1da177e4 1510 break;
a6dbe442
NP		 1511 case 3: /* include scrollback */
1512 flush_scrollback(vc);
1513 /* fallthrough */
1da177e4 1514 case 2: /* erase whole display */
d8ae7242 1515 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1516 count = vc->vc_cols * vc->vc_rows;
1517 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1518 break;
1519 default:
1520 return;
1521 }
1522 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
a6dbe442 1523 update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1524 vc->vc_need_wrap = 0;
1525}
1526
1527static void csi_K(struct vc_data *vc, int vpar)
1528{
1529 unsigned int count;
d8ae7242
NP		 1530 unsigned short *start = (unsigned short *)vc->vc_pos;
1531 int offset;
1da177e4
LT		 1532
1533 switch (vpar) {
1534 case 0: /* erase from cursor to end of line */
d8ae7242 1535 offset = 0;
1da177e4 1536 count = vc->vc_cols - vc->vc_x;
1da177e4
LT		 1537 break;
1538 case 1: /* erase from start of line to cursor */
d8ae7242 1539 offset = -vc->vc_x;
1da177e4 1540 count = vc->vc_x + 1;
1da177e4
LT		 1541 break;
1542 case 2: /* erase whole line */
d8ae7242 1543 offset = -vc->vc_x;
1da177e4 1544 count = vc->vc_cols;
1da177e4
LT		 1545 break;
1546 default:
1547 return;
1548 }
d8ae7242
NP		 1549 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1550 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1551 vc->vc_need_wrap = 0;
6ca8dfd7 1552 if (con_should_update(vc))
943210ba 1553 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1554}
1555
1556static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1557{ /* not vt100? */
1558 int count;
1559
1560 if (!vpar)
1561 vpar++;
1562 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1563
d8ae7242 1564 vc_uniscr_clear_line(vc, vc->vc_x, count);
1da177e4 1565 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1566 if (con_should_update(vc))
1da177e4
LT		 1567 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1568 vc->vc_need_wrap = 0;
1569}
1570
1571static void default_attr(struct vc_data *vc)
1572{
1573 vc->vc_intensity = 1;
fa6ce9ab 1574 vc->vc_italic = 0;
1da177e4
LT		 1575 vc->vc_underline = 0;
1576 vc->vc_reverse = 0;
1577 vc->vc_blink = 0;
1578 vc->vc_color = vc->vc_def_color;
1579}
1580
cec5b2a9
AB		 1581struct rgb { u8 r; u8 g; u8 b; };
1582
0f91e142 1583static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1584{
cec5b2a9 1585 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1586 c->r = i&1 ? 0xaa : 0x00;
1587 c->g = i&2 ? 0xaa : 0x00;
1588 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1589 } else if (i < 16) {
0f91e142
JS		 1590 c->r = i&1 ? 0xff : 0x55;
1591 c->g = i&2 ? 0xff : 0x55;
1592 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1593 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1594 c->r = (i - 16) / 36 * 85 / 2;
1595 c->g = (i - 16) / 6 % 6 * 85 / 2;
1596 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1597 } else /* Grayscale ramp. */
0f91e142 1598 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1599}
1600
0f91e142 1601static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1602{
193df022
JS		 1603 u8 hue = 0, max = max3(c->r, c->g, c->b);
1604
1605 if (c->r > max / 2)
1606 hue |= 4;
1607 if (c->g > max / 2)
1608 hue |= 2;
1609 if (c->b > max / 2)
1610 hue |= 1;
1611
1612 if (hue == 7 && max <= 0x55) {
1613 hue = 0;
1614 vc->vc_intensity = 2;
1615 } else if (max > 0xaa)
1616 vc->vc_intensity = 2;
cec5b2a9 1617 else
193df022
JS		 1618 vc->vc_intensity = 1;
1619
cec5b2a9
AB		 1620 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1621}
1622
0f91e142 1623static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1624{
1625 /* For backgrounds, err on the dark side. */
1626 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1627 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1628}
1629
e05ab238
JS		 1630/*
1631 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1632 * and thus need to be detected and ignored by hand. That standard also
1633 * wants : rather than ; as separators but sequences containing : are currently
1634 * completely ignored by the parser.
e05ab238
JS		 1635 *
1636 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1637 * supporting them.
1638 */
1639static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1640 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1641{
0f91e142
JS		 1642 struct rgb c;
1643
e05ab238
JS		 1644 i++;
1645 if (i > vc->vc_npar)
1646 return i;
1647
0bf1f4a8 1648 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1649 /* 256 colours */
e05ab238 1650 i++;
0f91e142 1651 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1652 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1653 /* 24 bit */
0f91e142
JS		 1654 c.r = vc->vc_par[i + 1];
1655 c.g = vc->vc_par[i + 2];
1656 c.b = vc->vc_par[i + 3];
e05ab238 1657 i += 3;
0f91e142
JS		 1658 } else
1659 return i;
1660
1661 set_color(vc, &c);
e05ab238
JS		 1662
1663 return i;
1664}
1665
ac751efa 1666/* console_lock is held */
1da177e4
LT		 1667static void csi_m(struct vc_data *vc)
1668{
1669 int i;
1670
1671 for (i = 0; i <= vc->vc_npar; i++)
1672 switch (vc->vc_par[i]) {
aada0a34
JS		 1673 case 0: /* all attributes off */
1674 default_attr(vc);
1675 break;
1676 case 1:
1677 vc->vc_intensity = 2;
1678 break;
1679 case 2:
1680 vc->vc_intensity = 0;
1681 break;
1682 case 3:
1683 vc->vc_italic = 1;
1684 break;
65d9982d
MF		 1685 case 21:
1686 /*
1687 * No console drivers support double underline, so
1688 * convert it to a single underline.
1689 */
aada0a34
JS		 1690 case 4:
1691 vc->vc_underline = 1;
1692 break;
1693 case 5:
1694 vc->vc_blink = 1;
1695 break;
1696 case 7:
1697 vc->vc_reverse = 1;
1698 break;
1699 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1700 * Select primary font, don't display control chars if
1701 * defined, don't set bit 8 on output.
1702 */
1703 vc->vc_translate = set_translate(vc->vc_charset == 0
1704 ? vc->vc_G0_charset
1705 : vc->vc_G1_charset, vc);
1706 vc->vc_disp_ctrl = 0;
1707 vc->vc_toggle_meta = 0;
1708 break;
1709 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1710 * Select first alternate font, lets chars < 32 be
1711 * displayed as ROM chars.
1712 */
1713 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1714 vc->vc_disp_ctrl = 1;
1715 vc->vc_toggle_meta = 0;
1716 break;
1717 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1718 * Select second alternate font, toggle high bit
1719 * before displaying as ROM char.
1720 */
1721 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1722 vc->vc_disp_ctrl = 1;
1723 vc->vc_toggle_meta = 1;
1724 break;
aada0a34
JS		 1725 case 22:
1726 vc->vc_intensity = 1;
1727 break;
1728 case 23:
1729 vc->vc_italic = 0;
1730 break;
1731 case 24:
1732 vc->vc_underline = 0;
1733 break;
1734 case 25:
1735 vc->vc_blink = 0;
1736 break;
1737 case 27:
1738 vc->vc_reverse = 0;
1739 break;
1740 case 38:
1741 i = vc_t416_color(vc, i, rgb_foreground);
1742 break;
1743 case 48:
1744 i = vc_t416_color(vc, i, rgb_background);
1745 break;
1746 case 39:
1747 vc->vc_color = (vc->vc_def_color & 0x0f) |
1748 (vc->vc_color & 0xf0);
1749 break;
1750 case 49:
1751 vc->vc_color = (vc->vc_def_color & 0xf0) |
1752 (vc->vc_color & 0x0f);
1753 break;
1754 default:
fadb4244
AB		 1755 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1756 if (vc->vc_par[i] < 100)
1757 vc->vc_intensity = 2;
cc67dc28
AB		 1758 vc->vc_par[i] -= 60;
1759 }
aada0a34
JS		 1760 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1761 vc->vc_color = color_table[vc->vc_par[i] - 30]
1762 | (vc->vc_color & 0xf0);
1763 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1764 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1765 | (vc->vc_color & 0x0f);
1766 break;
1da177e4
LT		 1767 }
1768 update_attr(vc);
1769}
1770
6732c8bb 1771static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1772{
1773 while (*p) {
6732c8bb 1774 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1775 p++;
1776 }
6732c8bb 1777 tty_schedule_flip(port);
1da177e4
LT		 1778}
1779
1780static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1781{
1782 char buf[40];
1783
1784 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1785 respond_string(buf, tty->port);
1da177e4
LT		 1786}
1787
1788static inline void status_report(struct tty_struct *tty)
1789{
6732c8bb 1790 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1791}
1792
6732c8bb 1793static inline void respond_ID(struct tty_struct *tty)
1da177e4 1794{
6732c8bb 1795 respond_string(VT102ID, tty->port);
1da177e4
LT		 1796}
1797
1798void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1799{
1800 char buf[8];
1801
1802 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1803 (char)('!' + mry));
6732c8bb 1804 respond_string(buf, tty->port);
1da177e4
LT		 1805}
1806
1807/* invoked via ioctl(TIOCLINUX) and through set_selection */
1808int mouse_reporting(void)
1809{
1810 return vc_cons[fg_console].d->vc_report_mouse;
1811}
1812
ac751efa 1813/* console_lock is held */
1da177e4
LT		 1814static void set_mode(struct vc_data *vc, int on_off)
1815{
1816 int i;
1817
1818 for (i = 0; i <= vc->vc_npar; i++)
2ff5c5a1 1819 if (vc->vc_priv == EPdec) {
1da177e4
LT		 1820 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1821 case 1: /* Cursor keys send ^[Ox/^[[x */
1822 if (on_off)
1823 set_kbd(vc, decckm);
1824 else
1825 clr_kbd(vc, decckm);
1826 break;
1827 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1828#if 0
1829 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1830 /* this alone does not suffice; some user mode
1831 utility has to change the hardware regs */
1832#endif
1833 break;
1834 case 5: /* Inverted screen on/off */
1835 if (vc->vc_decscnm != on_off) {
1836 vc->vc_decscnm = on_off;
1837 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1838 update_attr(vc);
1839 }
1840 break;
1841 case 6: /* Origin relative/absolute */
1842 vc->vc_decom = on_off;
1843 gotoxay(vc, 0, 0);
1844 break;
1845 case 7: /* Autowrap on/off */
1846 vc->vc_decawm = on_off;
1847 break;
1848 case 8: /* Autorepeat on/off */
1849 if (on_off)
1850 set_kbd(vc, decarm);
1851 else
1852 clr_kbd(vc, decarm);
1853 break;
1854 case 9:
1855 vc->vc_report_mouse = on_off ? 1 : 0;
1856 break;
1857 case 25: /* Cursor on/off */
1858 vc->vc_deccm = on_off;
1859 break;
1860 case 1000:
1861 vc->vc_report_mouse = on_off ? 2 : 0;
1862 break;
1863 }
1864 } else {
1865 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1866 case 3: /* Monitor (display ctrls) */
1867 vc->vc_disp_ctrl = on_off;
1868 break;
1869 case 4: /* Insert Mode on/off */
1870 vc->vc_decim = on_off;
1871 break;
1872 case 20: /* Lf, Enter == CrLf/Lf */
1873 if (on_off)
1874 set_kbd(vc, lnm);
1875 else
1876 clr_kbd(vc, lnm);
1877 break;
1878 }
1879 }
1880}
1881
ac751efa 1882/* console_lock is held */
1da177e4
LT		 1883static void setterm_command(struct vc_data *vc)
1884{
1885 switch(vc->vc_par[0]) {
1886 case 1: /* set color for underline mode */
1887 if (vc->vc_can_do_color &&
1888 vc->vc_par[1] < 16) {
1889 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1890 if (vc->vc_underline)
1891 update_attr(vc);
1892 }
1893 break;
1894 case 2: /* set color for half intensity mode */
1895 if (vc->vc_can_do_color &&
1896 vc->vc_par[1] < 16) {
1897 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1898 if (vc->vc_intensity == 0)
1899 update_attr(vc);
1900 }
1901 break;
1902 case 8: /* store colors as defaults */
1903 vc->vc_def_color = vc->vc_attr;
1904 if (vc->vc_hi_font_mask == 0x100)
1905 vc->vc_def_color >>= 1;
1906 default_attr(vc);
1907 update_attr(vc);
1908 break;
1909 case 9: /* set blanking interval */
f324edc8 1910 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1911 poke_blanked_console();
1912 break;
1913 case 10: /* set bell frequency in Hz */
1914 if (vc->vc_npar >= 1)
1915 vc->vc_bell_pitch = vc->vc_par[1];
1916 else
1917 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1918 break;
1919 case 11: /* set bell duration in msec */
1920 if (vc->vc_npar >= 1)
1921 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1922 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1923 else
1924 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1925 break;
1926 case 12: /* bring specified console to the front */
1927 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1928 set_console(vc->vc_par[1] - 1);
1929 break;
1930 case 13: /* unblank the screen */
1931 poke_blanked_console();
1932 break;
1933 case 14: /* set vesa powerdown interval */
1934 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1935 break;
1936 case 15: /* activate the previous console */
1937 set_console(last_console);
1938 break;
bd63364c
SD		 1939 case 16: /* set cursor blink duration in msec */
1940 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1941 vc->vc_par[1] <= USHRT_MAX)
1942 vc->vc_cur_blink_ms = vc->vc_par[1];
1943 else
1944 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1945 break;
1da177e4
LT		 1946 }
1947}
1948
ac751efa 1949/* console_lock is held */
1da177e4
LT		 1950static void csi_at(struct vc_data *vc, unsigned int nr)
1951{
1952 if (nr > vc->vc_cols - vc->vc_x)
1953 nr = vc->vc_cols - vc->vc_x;
1954 else if (!nr)
1955 nr = 1;
1956 insert_char(vc, nr);
1957}
1958
ac751efa 1959/* console_lock is held */
1da177e4
LT		 1960static void csi_L(struct vc_data *vc, unsigned int nr)
1961{
1962 if (nr > vc->vc_rows - vc->vc_y)
1963 nr = vc->vc_rows - vc->vc_y;
1964 else if (!nr)
1965 nr = 1;
89765b94 1966 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 1967 vc->vc_need_wrap = 0;
1968}
1969
ac751efa 1970/* console_lock is held */
1da177e4
LT		 1971static void csi_P(struct vc_data *vc, unsigned int nr)
1972{
1973 if (nr > vc->vc_cols - vc->vc_x)
1974 nr = vc->vc_cols - vc->vc_x;
1975 else if (!nr)
1976 nr = 1;
1977 delete_char(vc, nr);
1978}
1979
ac751efa 1980/* console_lock is held */
1da177e4
LT		 1981static void csi_M(struct vc_data *vc, unsigned int nr)
1982{
1983 if (nr > vc->vc_rows - vc->vc_y)
1984 nr = vc->vc_rows - vc->vc_y;
1985 else if (!nr)
1986 nr=1;
89765b94 1987 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 1988 vc->vc_need_wrap = 0;
1989}
1990
ac751efa 1991/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1992static void save_cur(struct vc_data *vc)
1993{
1994 vc->vc_saved_x = vc->vc_x;
1995 vc->vc_saved_y = vc->vc_y;
1996 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1997 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1998 vc->vc_s_underline = vc->vc_underline;
1999 vc->vc_s_blink = vc->vc_blink;
2000 vc->vc_s_reverse = vc->vc_reverse;
2001 vc->vc_s_charset = vc->vc_charset;
2002 vc->vc_s_color = vc->vc_color;
2003 vc->vc_saved_G0 = vc->vc_G0_charset;
2004 vc->vc_saved_G1 = vc->vc_G1_charset;
2005}
2006
ac751efa 2007/* console_lock is held */
1da177e4
LT		 2008static void restore_cur(struct vc_data *vc)
2009{
2010 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2011 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 2012 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 2013 vc->vc_underline = vc->vc_s_underline;
2014 vc->vc_blink = vc->vc_s_blink;
2015 vc->vc_reverse = vc->vc_s_reverse;
2016 vc->vc_charset = vc->vc_s_charset;
2017 vc->vc_color = vc->vc_s_color;
2018 vc->vc_G0_charset = vc->vc_saved_G0;
2019 vc->vc_G1_charset = vc->vc_saved_G1;
2020 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2021 update_attr(vc);
2022 vc->vc_need_wrap = 0;
2023}
2024
b290af68 2025enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
7a99565f 2026 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
63f3a16d 2027 ESpalette, ESosc };
1da177e4 2028
ac751efa 2029/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2030static void reset_terminal(struct vc_data *vc, int do_clear)
2031{
2032 vc->vc_top = 0;
2033 vc->vc_bottom = vc->vc_rows;
2034 vc->vc_state = ESnormal;
2ff5c5a1 2035 vc->vc_priv = EPecma;
1da177e4
LT		 2036 vc->vc_translate = set_translate(LAT1_MAP, vc);
2037 vc->vc_G0_charset = LAT1_MAP;
2038 vc->vc_G1_charset = GRAF_MAP;
2039 vc->vc_charset = 0;
2040 vc->vc_need_wrap = 0;
2041 vc->vc_report_mouse = 0;
042f10ec 2042 vc->vc_utf = default_utf8;
1da177e4
LT		 2043 vc->vc_utf_count = 0;
2044
2045 vc->vc_disp_ctrl = 0;
2046 vc->vc_toggle_meta = 0;
2047
2048 vc->vc_decscnm = 0;
2049 vc->vc_decom = 0;
2050 vc->vc_decawm = 1;
f6c06b68 2051 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2052 vc->vc_decim = 0;
2053
079c9534 2054 vt_reset_keyboard(vc->vc_num);
1da177e4 2055
9ea9a886 2056 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2057 vc->vc_complement_mask = vc->vc_s_complement_mask;
2058
2059 default_attr(vc);
2060 update_attr(vc);
2061
f1869a89 2062 vc->vc_tab_stop[0] =
1da177e4
LT		 2063 vc->vc_tab_stop[1] =
2064 vc->vc_tab_stop[2] =
2065 vc->vc_tab_stop[3] =
a564738c
WK		 2066 vc->vc_tab_stop[4] =
2067 vc->vc_tab_stop[5] =
2068 vc->vc_tab_stop[6] =
2069 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 2070
2071 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2072 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2073 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2074
2075 gotoxy(vc, 0, 0);
2076 save_cur(vc);
2077 if (do_clear)
2078 csi_J(vc, 2);
2079}
2080
ac751efa 2081/* console_lock is held */
1da177e4
LT		 2082static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2083{
2084 /*
2085 * Control characters can be used in the _middle_
2086 * of an escape sequence.
2087 */
63f3a16d
AB		 2088 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2089 return;
1da177e4
LT		 2090 switch (c) {
2091 case 0:
2092 return;
2093 case 7:
63f3a16d
AB		 2094 if (vc->vc_state == ESosc)
2095 vc->vc_state = ESnormal;
2096 else if (vc->vc_bell_duration)
1da177e4
LT		 2097 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2098 return;
2099 case 8:
2100 bs(vc);
2101 return;
2102 case 9:
2103 vc->vc_pos -= (vc->vc_x << 1);
2104 while (vc->vc_x < vc->vc_cols - 1) {
2105 vc->vc_x++;
f1869a89 2106 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1da177e4
LT		 2107 break;
2108 }
2109 vc->vc_pos += (vc->vc_x << 1);
b293d758 2110 notify_write(vc, '\t');
1da177e4
LT		 2111 return;
2112 case 10: case 11: case 12:
2113 lf(vc);
2114 if (!is_kbd(vc, lnm))
2115 return;
17504fd7 2116 /* fall through */
1da177e4
LT		 2117 case 13:
2118 cr(vc);
2119 return;
2120 case 14:
2121 vc->vc_charset = 1;
2122 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2123 vc->vc_disp_ctrl = 1;
2124 return;
2125 case 15:
2126 vc->vc_charset = 0;
2127 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2128 vc->vc_disp_ctrl = 0;
2129 return;
2130 case 24: case 26:
2131 vc->vc_state = ESnormal;
2132 return;
2133 case 27:
2134 vc->vc_state = ESesc;
2135 return;
2136 case 127:
2137 del(vc);
2138 return;
2139 case 128+27:
2140 vc->vc_state = ESsquare;
2141 return;
2142 }
2143 switch(vc->vc_state) {
2144 case ESesc:
2145 vc->vc_state = ESnormal;
2146 switch (c) {
2147 case '[':
2148 vc->vc_state = ESsquare;
2149 return;
2150 case ']':
2151 vc->vc_state = ESnonstd;
2152 return;
2153 case '%':
2154 vc->vc_state = ESpercent;
2155 return;
2156 case 'E':
2157 cr(vc);
2158 lf(vc);
2159 return;
2160 case 'M':
2161 ri(vc);
2162 return;
2163 case 'D':
2164 lf(vc);
2165 return;
2166 case 'H':
f1869a89 2167 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1da177e4
LT		 2168 return;
2169 case 'Z':
2170 respond_ID(tty);
2171 return;
2172 case '7':
2173 save_cur(vc);
2174 return;
2175 case '8':
2176 restore_cur(vc);
2177 return;
2178 case '(':
2179 vc->vc_state = ESsetG0;
2180 return;
2181 case ')':
2182 vc->vc_state = ESsetG1;
2183 return;
2184 case '#':
2185 vc->vc_state = EShash;
2186 return;
2187 case 'c':
2188 reset_terminal(vc, 1);
2189 return;
2190 case '>': /* Numeric keypad */
2191 clr_kbd(vc, kbdapplic);
2192 return;
2193 case '=': /* Appl. keypad */
2194 set_kbd(vc, kbdapplic);
2195 return;
2196 }
2197 return;
2198 case ESnonstd:
2199 if (c=='P') { /* palette escape sequence */
2200 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2201 vc->vc_par[vc->vc_npar] = 0;
2202 vc->vc_npar = 0;
2203 vc->vc_state = ESpalette;
2204 return;
2205 } else if (c=='R') { /* reset palette */
2206 reset_palette(vc);
2207 vc->vc_state = ESnormal;
63f3a16d
AB		 2208 } else if (c>='0' && c<='9')
2209 vc->vc_state = ESosc;
2210 else
1da177e4
LT		 2211 vc->vc_state = ESnormal;
2212 return;
2213 case ESpalette:
74c807ce
AS		 2214 if (isxdigit(c)) {
2215 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2216 if (vc->vc_npar == 7) {
2217 int i = vc->vc_par[0] * 3, j = 1;
2218 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2219 vc->vc_palette[i++] += vc->vc_par[j++];
2220 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2221 vc->vc_palette[i++] += vc->vc_par[j++];
2222 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2223 vc->vc_palette[i] += vc->vc_par[j];
2224 set_palette(vc);
2225 vc->vc_state = ESnormal;
2226 }
2227 } else
2228 vc->vc_state = ESnormal;
2229 return;
2230 case ESsquare:
2231 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2232 vc->vc_par[vc->vc_npar] = 0;
2233 vc->vc_npar = 0;
2234 vc->vc_state = ESgetpars;
2235 if (c == '[') { /* Function key */
2236 vc->vc_state=ESfunckey;
2237 return;
2238 }
5445447b
MH		 2239 switch (c) {
2240 case '?':
2241 vc->vc_priv = EPdec;
2242 return;
2243 case '>':
2244 vc->vc_priv = EPgt;
2245 return;
2246 case '=':
2247 vc->vc_priv = EPeq;
1da177e4 2248 return;
5445447b
MH		 2249 case '<':
2250 vc->vc_priv = EPlt;
2251 return;
2252 }
2253 vc->vc_priv = EPecma;
17504fd7 2254 /* fall through */
1da177e4
LT		 2255 case ESgetpars:
2256 if (c == ';' && vc->vc_npar < NPAR - 1) {
2257 vc->vc_npar++;
2258 return;
2259 } else if (c>='0' && c<='9') {
2260 vc->vc_par[vc->vc_npar] *= 10;
2261 vc->vc_par[vc->vc_npar] += c - '0';
2262 return;
b290af68 2263 }
04afcd3a 2264 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
7a99565f
MH		 2265 vc->vc_state = EScsiignore;
2266 return;
2267 }
1da177e4
LT		 2268 vc->vc_state = ESnormal;
2269 switch(c) {
2270 case 'h':
5445447b
MH		 2271 if (vc->vc_priv <= EPdec)
2272 set_mode(vc, 1);
1da177e4
LT		 2273 return;
2274 case 'l':
5445447b
MH		 2275 if (vc->vc_priv <= EPdec)
2276 set_mode(vc, 0);
1da177e4
LT		 2277 return;
2278 case 'c':
2ff5c5a1 2279 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2280 if (vc->vc_par[0])
2281 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2282 else
9ea9a886 2283 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2284 return;
2285 }
2286 break;
2287 case 'm':
2ff5c5a1 2288 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2289 clear_selection();
2290 if (vc->vc_par[0])
2291 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2292 else
2293 vc->vc_complement_mask = vc->vc_s_complement_mask;
2294 return;
2295 }
2296 break;
2297 case 'n':
2ff5c5a1 2298 if (vc->vc_priv == EPecma) {
1da177e4
LT		 2299 if (vc->vc_par[0] == 5)
2300 status_report(tty);
2301 else if (vc->vc_par[0] == 6)
2302 cursor_report(vc, tty);
2303 }
2304 return;
2305 }
2ff5c5a1
MH		 2306 if (vc->vc_priv != EPecma) {
2307 vc->vc_priv = EPecma;
1da177e4
LT		 2308 return;
2309 }
2310 switch(c) {
2311 case 'G': case '`':
2312 if (vc->vc_par[0])
2313 vc->vc_par[0]--;
2314 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2315 return;
2316 case 'A':
2317 if (!vc->vc_par[0])
2318 vc->vc_par[0]++;
2319 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2320 return;
2321 case 'B': case 'e':
2322 if (!vc->vc_par[0])
2323 vc->vc_par[0]++;
2324 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2325 return;
2326 case 'C': case 'a':
2327 if (!vc->vc_par[0])
2328 vc->vc_par[0]++;
2329 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2330 return;
2331 case 'D':
2332 if (!vc->vc_par[0])
2333 vc->vc_par[0]++;
2334 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2335 return;
2336 case 'E':
2337 if (!vc->vc_par[0])
2338 vc->vc_par[0]++;
2339 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2340 return;
2341 case 'F':
2342 if (!vc->vc_par[0])
2343 vc->vc_par[0]++;
2344 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2345 return;
2346 case 'd':
2347 if (vc->vc_par[0])
2348 vc->vc_par[0]--;
2349 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2350 return;
2351 case 'H': case 'f':
2352 if (vc->vc_par[0])
2353 vc->vc_par[0]--;
2354 if (vc->vc_par[1])
2355 vc->vc_par[1]--;
2356 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2357 return;
2358 case 'J':
2359 csi_J(vc, vc->vc_par[0]);
2360 return;
2361 case 'K':
2362 csi_K(vc, vc->vc_par[0]);
2363 return;
2364 case 'L':
2365 csi_L(vc, vc->vc_par[0]);
2366 return;
2367 case 'M':
2368 csi_M(vc, vc->vc_par[0]);
2369 return;
2370 case 'P':
2371 csi_P(vc, vc->vc_par[0]);
2372 return;
2373 case 'c':
2374 if (!vc->vc_par[0])
2375 respond_ID(tty);
2376 return;
2377 case 'g':
2378 if (!vc->vc_par[0])
f1869a89 2379 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
1da177e4
LT		 2380 else if (vc->vc_par[0] == 3) {
2381 vc->vc_tab_stop[0] =
2382 vc->vc_tab_stop[1] =
2383 vc->vc_tab_stop[2] =
2384 vc->vc_tab_stop[3] =
a564738c
WK		 2385 vc->vc_tab_stop[4] =
2386 vc->vc_tab_stop[5] =
2387 vc->vc_tab_stop[6] =
2388 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2389 }
2390 return;
2391 case 'm':
2392 csi_m(vc);
2393 return;
2394 case 'q': /* DECLL - but only 3 leds */
2395 /* map 0,1,2,3 to 0,1,2,4 */
2396 if (vc->vc_par[0] < 4)
079c9534 2397 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2398 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2399 return;
2400 case 'r':
2401 if (!vc->vc_par[0])
2402 vc->vc_par[0]++;
2403 if (!vc->vc_par[1])
2404 vc->vc_par[1] = vc->vc_rows;
2405 /* Minimum allowed region is 2 lines */
2406 if (vc->vc_par[0] < vc->vc_par[1] &&
2407 vc->vc_par[1] <= vc->vc_rows) {
2408 vc->vc_top = vc->vc_par[0] - 1;
2409 vc->vc_bottom = vc->vc_par[1];
2410 gotoxay(vc, 0, 0);
2411 }
2412 return;
2413 case 's':
2414 save_cur(vc);
2415 return;
2416 case 'u':
2417 restore_cur(vc);
2418 return;
2419 case 'X':
2420 csi_X(vc, vc->vc_par[0]);
2421 return;
2422 case '@':
2423 csi_at(vc, vc->vc_par[0]);
2424 return;
2425 case ']': /* setterm functions */
2426 setterm_command(vc);
2427 return;
2428 }
2429 return;
7a99565f
MH		 2430 case EScsiignore:
2431 if (c >= 20 && c <= 0x3f)
2432 return;
2433 vc->vc_state = ESnormal;
2434 return;
1da177e4
LT		 2435 case ESpercent:
2436 vc->vc_state = ESnormal;
2437 switch (c) {
2438 case '@': /* defined in ISO 2022 */
2439 vc->vc_utf = 0;
2440 return;
2441 case 'G': /* prelim official escape code */
2442 case '8': /* retained for compatibility */
2443 vc->vc_utf = 1;
2444 return;
2445 }
2446 return;
2447 case ESfunckey:
2448 vc->vc_state = ESnormal;
2449 return;
2450 case EShash:
2451 vc->vc_state = ESnormal;
2452 if (c == '8') {
2453 /* DEC screen alignment test. kludge :-) */
2454 vc->vc_video_erase_char =
2455 (vc->vc_video_erase_char & 0xff00) | 'E';
2456 csi_J(vc, 2);
2457 vc->vc_video_erase_char =
2458 (vc->vc_video_erase_char & 0xff00) | ' ';
2459 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2460 }
2461 return;
2462 case ESsetG0:
2463 if (c == '0')
2464 vc->vc_G0_charset = GRAF_MAP;
2465 else if (c == 'B')
2466 vc->vc_G0_charset = LAT1_MAP;
2467 else if (c == 'U')
2468 vc->vc_G0_charset = IBMPC_MAP;
2469 else if (c == 'K')
2470 vc->vc_G0_charset = USER_MAP;
2471 if (vc->vc_charset == 0)
2472 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2473 vc->vc_state = ESnormal;
2474 return;
2475 case ESsetG1:
2476 if (c == '0')
2477 vc->vc_G1_charset = GRAF_MAP;
2478 else if (c == 'B')
2479 vc->vc_G1_charset = LAT1_MAP;
2480 else if (c == 'U')
2481 vc->vc_G1_charset = IBMPC_MAP;
2482 else if (c == 'K')
2483 vc->vc_G1_charset = USER_MAP;
2484 if (vc->vc_charset == 1)
2485 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2486 vc->vc_state = ESnormal;
2487 return;
63f3a16d
AB		 2488 case ESosc:
2489 return;
1da177e4
LT		 2490 default:
2491 vc->vc_state = ESnormal;
2492 }
2493}
2494
2f1a2ccb 2495/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2496 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2497 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2498 */
2499struct interval {
2500 uint32_t first;
2501 uint32_t last;
2502};
2503
f0a8d84f 2504static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2505{
f0a8d84f
TM		 2506 uint32_t ucs = *(uint32_t *)key;
2507 struct interval e = *(struct interval *) elt;
2f1a2ccb 2508
f0a8d84f
TM		 2509 if (ucs > e.last)
2510 return 1;
2511 else if (ucs < e.first)
2512 return -1;
2f1a2ccb
EK		 2513 return 0;
2514}
2515
2516static int is_double_width(uint32_t ucs)
2517{
2518 static const struct interval double_width[] = {
2519 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2520 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2521 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2522 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2523 };
f0a8d84f
TM		 2524 if (ucs < double_width[0].first ||
2525 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2526 return 0;
2527
2528 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2529 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2530}
2531
d711ea8f
JS		 2532static void con_flush(struct vc_data *vc, unsigned long draw_from,
2533 unsigned long draw_to, int *draw_x)
2534{
2535 if (*draw_x < 0)
2536 return;
2537
2538 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2539 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2540 *draw_x = -1;
2541}
2542
ac751efa 2543/* acquires console_lock */
1da177e4
LT		 2544static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2545{
d8ae7242 2546 int c, next_c, tc, ok, n = 0, draw_x = -1;
1da177e4
LT		 2547 unsigned int currcons;
2548 unsigned long draw_from = 0, draw_to = 0;
2549 struct vc_data *vc;
2f1a2ccb 2550 unsigned char vc_attr;
0341a4d0 2551 struct vt_notifier_param param;
2f1a2ccb
EK		 2552 uint8_t rescan;
2553 uint8_t inverse;
2554 uint8_t width;
1da177e4 2555 u16 himask, charmask;
1da177e4
LT		 2556
2557 if (in_interrupt())
2558 return count;
2559
2560 might_sleep();
2561
ac751efa 2562 console_lock();
1da177e4
LT		 2563 vc = tty->driver_data;
2564 if (vc == NULL) {
bccf1da3 2565 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2566 console_unlock();
1da177e4
LT		 2567 return 0;
2568 }
2569
2570 currcons = vc->vc_num;
2571 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2572 /* could this happen? */
2573 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2574 console_unlock();
2575 return 0;
1da177e4 2576 }
1da177e4 2577
1da177e4
LT		 2578 himask = vc->vc_hi_font_mask;
2579 charmask = himask ? 0x1ff : 0xff;
2580
2581 /* undraw cursor first */
6ca8dfd7 2582 if (con_is_fg(vc))
1da177e4
LT		 2583 hide_cursor(vc);
2584
0341a4d0
KD		 2585 param.vc = vc;
2586
1da177e4
LT		 2587 while (!tty->stopped && count) {
2588 int orig = *buf;
2589 c = orig;
2590 buf++;
2591 n++;
2592 count--;
2f1a2ccb
EK		 2593 rescan = 0;
2594 inverse = 0;
2595 width = 1;
1da177e4
LT		 2596
2597 /* Do no translation at all in control states */
2598 if (vc->vc_state != ESnormal) {
2599 tc = c;
d4328b40 2600 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2601 /* Combine UTF-8 into Unicode in vc_utf_char.
2602 * vc_utf_count is the number of continuation bytes still
2603 * expected to arrive.
2604 * vc_npar is the number of continuation bytes arrived so
2605 * far
2606 */
d4328b40 2607rescan_last_byte:
2f1a2ccb
EK		 2608 if ((c & 0xc0) == 0x80) {
2609 /* Continuation byte received */
2610 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2611 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2612 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2613 vc->vc_npar++;
2614 if (--vc->vc_utf_count) {
2615 /* Still need some bytes */
1da177e4 2616 continue;
2f1a2ccb
EK		 2617 }
2618 /* Got a whole character */
2619 c = vc->vc_utf_char;
2620 /* Reject overlong sequences */
2621 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2622 c > utf8_length_changes[vc->vc_npar])
2623 c = 0xfffd;
2624 } else {
2625 /* Unexpected continuation byte */
2626 vc->vc_utf_count = 0;
2627 c = 0xfffd;
2628 }
1da177e4 2629 } else {
2f1a2ccb
EK		 2630 /* Single ASCII byte or first byte of a sequence received */
2631 if (vc->vc_utf_count) {
2632 /* Continuation byte expected */
2633 rescan = 1;
2634 vc->vc_utf_count = 0;
2635 c = 0xfffd;
2636 } else if (c > 0x7f) {
2637 /* First byte of a multibyte sequence received */
2638 vc->vc_npar = 0;
2639 if ((c & 0xe0) == 0xc0) {
2640 vc->vc_utf_count = 1;
2641 vc->vc_utf_char = (c & 0x1f);
2642 } else if ((c & 0xf0) == 0xe0) {
2643 vc->vc_utf_count = 2;
2644 vc->vc_utf_char = (c & 0x0f);
2645 } else if ((c & 0xf8) == 0xf0) {
2646 vc->vc_utf_count = 3;
2647 vc->vc_utf_char = (c & 0x07);
2648 } else if ((c & 0xfc) == 0xf8) {
2649 vc->vc_utf_count = 4;
2650 vc->vc_utf_char = (c & 0x03);
2651 } else if ((c & 0xfe) == 0xfc) {
2652 vc->vc_utf_count = 5;
2653 vc->vc_utf_char = (c & 0x01);
2654 } else {
2655 /* 254 and 255 are invalid */
2656 c = 0xfffd;
2657 }
2658 if (vc->vc_utf_count) {
2659 /* Still need some bytes */
2660 continue;
2661 }
2662 }
2663 /* Nothing to do if an ASCII byte was received */
1da177e4 2664 }
2f1a2ccb
EK		 2665 /* End of UTF-8 decoding. */
2666 /* c is the received character, or U+FFFD for invalid sequences. */
2667 /* Replace invalid Unicode code points with U+FFFD too */
2668 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2669 c = 0xfffd;
2670 tc = c;
d4328b40 2671 } else { /* no utf or alternate charset mode */
a29ccf6f 2672 tc = vc_translate(vc, c);
1da177e4
LT		 2673 }
2674
0341a4d0
KD		 2675 param.c = tc;
2676 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2677 &param) == NOTIFY_STOP)
2678 continue;
2679
1da177e4
LT		 2680 /* If the original code was a control character we
2681 * only allow a glyph to be displayed if the code is
2682 * not normally used (such as for cursor movement) or
2683 * if the disp_ctrl mode has been explicitly enabled.
2684 * Certain characters (as given by the CTRL_ALWAYS
2685 * bitmap) are always displayed as control characters,
2686 * as the console would be pretty useless without
2687 * them; to display an arbitrary font position use the
2688 * direct-to-font zone in UTF-8 mode.
2689 */
2690 ok = tc && (c >= 32 ||
d4328b40
AT		 2691 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2692 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2693 && (c != 127 || vc->vc_disp_ctrl)
2694 && (c != 128+27);
2695
2696 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2697 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2698 if (is_double_width(c))
2699 width = 2;
2700 }
1da177e4
LT		 2701 /* Now try to find out how to display it */
2702 tc = conv_uni_to_pc(vc, tc);
d4328b40 2703 if (tc & ~charmask) {
2f1a2ccb
EK		 2704 if (tc == -1 || tc == -2) {
2705 continue; /* nothing to display */
2706 }
2707 /* Glyph not found */
c0b79882 2708 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2709 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2710 This would make absolutely no sense with Unicode in mind,
2711 but do this for ASCII characters since a font may lack
2712 Unicode mapping info and we don't want to end up with
2713 having question marks only. */
2f1a2ccb
EK		 2714 tc = c;
2715 } else {
2716 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2717 tc = conv_uni_to_pc(vc, 0xfffd);
2718 if (tc < 0) {
2719 inverse = 1;
2720 tc = conv_uni_to_pc(vc, '?');
2721 if (tc < 0) tc = '?';
2722 }
2723 }
d4328b40 2724 }
1da177e4 2725
2f1a2ccb
EK		 2726 if (!inverse) {
2727 vc_attr = vc->vc_attr;
1da177e4 2728 } else {
2f1a2ccb
EK		 2729 /* invert vc_attr */
2730 if (!vc->vc_can_do_color) {
2731 vc_attr = (vc->vc_attr) ^ 0x08;
2732 } else if (vc->vc_hi_font_mask == 0x100) {
2733 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2734 } else {
2735 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2736 }
d711ea8f 2737 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2738 }
2f1a2ccb 2739
d8ae7242 2740 next_c = c;
2f1a2ccb
EK		 2741 while (1) {
2742 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2743 con_flush(vc, draw_from, draw_to,
2744 &draw_x);
2f1a2ccb
EK		 2745 if (vc->vc_need_wrap) {
2746 cr(vc);
2747 lf(vc);
2748 }
2749 if (vc->vc_decim)
2750 insert_char(vc, 1);
d8ae7242 2751 vc_uniscr_putc(vc, next_c);
2f1a2ccb
EK		 2752 scr_writew(himask ?
2753 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2754 (vc_attr << 8) + tc,
2755 (u16 *) vc->vc_pos);
6ca8dfd7 2756 if (con_should_update(vc) && draw_x < 0) {
2f1a2ccb
EK		 2757 draw_x = vc->vc_x;
2758 draw_from = vc->vc_pos;
2759 }
2760 if (vc->vc_x == vc->vc_cols - 1) {
2761 vc->vc_need_wrap = vc->vc_decawm;
2762 draw_to = vc->vc_pos + 2;
2763 } else {
2764 vc->vc_x++;
2765 draw_to = (vc->vc_pos += 2);
d4328b40 2766 }
2f1a2ccb
EK		 2767
2768 if (!--width) break;
2769
2770 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2771 if (tc < 0) tc = ' ';
d8ae7242 2772 next_c = ' ';
2f1a2ccb 2773 }
b293d758 2774 notify_write(vc, c);
2f1a2ccb 2775
d711ea8f
JS		 2776 if (inverse)
2777 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2778
2f1a2ccb
EK		 2779 if (rescan) {
2780 rescan = 0;
2781 inverse = 0;
2782 width = 1;
d4328b40
AT		 2783 c = orig;
2784 goto rescan_last_byte;
2785 }
1da177e4
LT		 2786 continue;
2787 }
d711ea8f 2788 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2789 do_con_trol(tty, vc, orig);
2790 }
d711ea8f 2791 con_flush(vc, draw_from, draw_to, &draw_x);
0224080f 2792 vc_uniscr_debug_check(vc);
1da177e4 2793 console_conditional_schedule();
b293d758 2794 notify_update(vc);
7e1d2263 2795 console_unlock();
1da177e4 2796 return n;
1da177e4
LT		 2797}
2798
2799/*
2800 * This is the console switching callback.
2801 *
2802 * Doing console switching in a process context allows
2803 * us to do the switches asynchronously (needed when we want
2804 * to switch due to a keyboard interrupt). Synchronization
2805 * with other console code and prevention of re-entrancy is
ac751efa 2806 * ensured with console_lock.
1da177e4 2807 */
65f27f38 2808static void console_callback(struct work_struct *ignored)
1da177e4 2809{
ac751efa 2810 console_lock();
1da177e4
LT		 2811
2812 if (want_console >= 0) {
2813 if (want_console != fg_console &&
2814 vc_cons_allocated(want_console)) {
2815 hide_cursor(vc_cons[fg_console].d);
2816 change_console(vc_cons[want_console].d);
2817 /* we only changed when the console had already
2818 been allocated - a new console is not created
2819 in an interrupt routine */
2820 }
2821 want_console = -1;
2822 }
2823 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2824 do_poke_blanked_console = 0;
2825 poke_blanked_console();
2826 }
2827 if (scrollback_delta) {
2828 struct vc_data *vc = vc_cons[fg_console].d;
2829 clear_selection();
97293de9 2830 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2831 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2832 scrollback_delta = 0;
2833 }
2834 if (blank_timer_expired) {
2835 do_blank_screen(0);
2836 blank_timer_expired = 0;
2837 }
b293d758 2838 notify_update(vc_cons[fg_console].d);
1da177e4 2839
ac751efa 2840 console_unlock();
1da177e4
LT		 2841}
2842
b257bc05 2843int set_console(int nr)
1da177e4 2844{
b257bc05
AJ		 2845 struct vc_data *vc = vc_cons[fg_console].d;
2846
2847 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2848 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2849
2850 /*
2851 * Console switch will fail in console_callback() or
2852 * change_console() so there is no point scheduling
2853 * the callback
2854 *
2855 * Existing set_console() users don't check the return
2856 * value so this shouldn't break anything
2857 */
2858 return -EINVAL;
2859 }
2860
1da177e4
LT		 2861 want_console = nr;
2862 schedule_console_callback();
b257bc05
AJ		 2863
2864 return 0;
1da177e4
LT		 2865}
2866
2867struct tty_driver *console_driver;
2868
2869#ifdef CONFIG_VT_CONSOLE
2870
5ada918b
BW		 2871/**
2872 * vt_kmsg_redirect() - Sets/gets the kernel message console
2873 * @new: The new virtual terminal number or -1 if the console should stay
2874 * unchanged
2875 *
2876 * By default, the kernel messages are always printed on the current virtual
2877 * console. However, the user may modify that default with the
2878 * TIOCL_SETKMSGREDIRECT ioctl call.
2879 *
2880 * This function sets the kernel message console to be @new. It returns the old
2881 * virtual console number. The virtual terminal number 0 (both as parameter and
2882 * return value) means no redirection (i.e. always printed on the currently
2883 * active console).
2884 *
2885 * The parameter -1 means that only the current console is returned, but the
2886 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2887 * case to make the code more understandable.
2888 *
2889 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2890 * the parameter and always returns 0.
2891 */
2892int vt_kmsg_redirect(int new)
2893{
2894 static int kmsg_con;
2895
2896 if (new != -1)
2897 return xchg(&kmsg_con, new);
2898 else
2899 return kmsg_con;
2900}
2901
1da177e4
LT		 2902/*
2903 * Console on virtual terminal
2904 *
2905 * The console must be locked when we get here.
2906 */
2907
2908static void vt_console_print(struct console *co, const char *b, unsigned count)
2909{
2910 struct vc_data *vc = vc_cons[fg_console].d;
2911 unsigned char c;
b0940003 2912 static DEFINE_SPINLOCK(printing_lock);
1da177e4 2913 const ushort *start;
6609cff6 2914 ushort start_x, cnt;
5ada918b 2915 int kmsg_console;
1da177e4
LT		 2916
2917 /* console busy or not yet initialized */
b0940003
NP		 2918 if (!printable)
2919 return;
2920 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2921 return;
2922
5ada918b
BW		 2923 kmsg_console = vt_get_kmsg_redirect();
2924 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2925 vc = vc_cons[kmsg_console - 1].d;
1da177e4 2926
1da177e4
LT		 2927 if (!vc_cons_allocated(fg_console)) {
2928 /* impossible */
2929 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2930 goto quit;
2931 }
2932
8d7fc299 2933 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 2934 goto quit;
2935
2936 /* undraw cursor first */
6ca8dfd7 2937 if (con_is_fg(vc))
1da177e4
LT		 2938 hide_cursor(vc);
2939
2940 start = (ushort *)vc->vc_pos;
6609cff6
NP		 2941 start_x = vc->vc_x;
2942 cnt = 0;
1da177e4
LT		 2943 while (count--) {
2944 c = *b++;
2945 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
6609cff6
NP		 2946 if (cnt && con_is_visible(vc))
2947 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2948 cnt = 0;
1da177e4
LT		 2949 if (c == 8) { /* backspace */
2950 bs(vc);
2951 start = (ushort *)vc->vc_pos;
6609cff6 2952 start_x = vc->vc_x;
1da177e4
LT		 2953 continue;
2954 }
2955 if (c != 13)
2956 lf(vc);
2957 cr(vc);
2958 start = (ushort *)vc->vc_pos;
6609cff6 2959 start_x = vc->vc_x;
1da177e4
LT		 2960 if (c == 10 || c == 13)
2961 continue;
2962 }
6609cff6 2963 vc_uniscr_putc(vc, c);
1da177e4 2964 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2965 notify_write(vc, c);
1da177e4 2966 cnt++;
6609cff6 2967 if (vc->vc_x == vc->vc_cols - 1) {
1da177e4 2968 vc->vc_need_wrap = 1;
6609cff6
NP		 2969 } else {
2970 vc->vc_pos += 2;
2971 vc->vc_x++;
1da177e4
LT		 2972 }
2973 }
6609cff6
NP		 2974 if (cnt && con_is_visible(vc))
2975 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
1da177e4 2976 set_cursor(vc);
b293d758 2977 notify_update(vc);
1da177e4
LT		 2978
2979quit:
b0940003 2980 spin_unlock(&printing_lock);
1da177e4
LT		 2981}
2982
2983static struct tty_driver *vt_console_device(struct console *c, int *index)
2984{
2985 *index = c->index ? c->index-1 : fg_console;
2986 return console_driver;
2987}
2988
2989static struct console vt_console_driver = {
2990 .name = "tty",
2991 .write = vt_console_print,
2992 .device = vt_console_device,
2993 .unblank = unblank_screen,
2994 .flags = CON_PRINTBUFFER,
2995 .index = -1,
2996};
2997#endif
2998
2999/*
3000 * Handling of Linux-specific VC ioctls
3001 */
3002
3003/*
ac751efa 3004 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3005 *
3006 * There are some functions which don't need it.
3007 *
3008 * There are some functions which can sleep for arbitrary periods
3009 * (paste_selection) but we don't need the lock there anyway.
3010 *
3011 * set_selection has locking, and definitely needs it
3012 */
3013
3014int tioclinux(struct tty_struct *tty, unsigned long arg)
3015{
3016 char type, data;
3017 char __user *p = (char __user *)arg;
3018 int lines;
3019 int ret;
3020
1da177e4
LT		 3021 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3022 return -EPERM;
3023 if (get_user(type, p))
3024 return -EFAULT;
3025 ret = 0;
04f378b1 3026
1da177e4
LT		 3027 switch (type)
3028 {
3029 case TIOCL_SETSEL:
ac751efa 3030 console_lock();
1da177e4 3031 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 3032 console_unlock();
1da177e4
LT		 3033 break;
3034 case TIOCL_PASTESEL:
3035 ret = paste_selection(tty);
3036 break;
3037 case TIOCL_UNBLANKSCREEN:
ac751efa 3038 console_lock();
1da177e4 3039 unblank_screen();
ac751efa 3040 console_unlock();
1da177e4
LT		 3041 break;
3042 case TIOCL_SELLOADLUT:
5289475d 3043 console_lock();
1da177e4 3044 ret = sel_loadlut(p);
5289475d 3045 console_unlock();
1da177e4
LT		 3046 break;
3047 case TIOCL_GETSHIFTSTATE:
04f378b1 3048
1da177e4
LT		 3049 /*
3050 * Make it possible to react to Shift+Mousebutton.
3051 * Note that 'shift_state' is an undocumented
3052 * kernel-internal variable; programs not closely
3053 * related to the kernel should not use this.
3054 */
079c9534 3055 data = vt_get_shift_state();
6987dc8a 3056 ret = put_user(data, p);
1da177e4
LT		 3057 break;
3058 case TIOCL_GETMOUSEREPORTING:
20f62579 3059 console_lock(); /* May be overkill */
1da177e4 3060 data = mouse_reporting();
20f62579 3061 console_unlock();
6987dc8a 3062 ret = put_user(data, p);
1da177e4
LT		 3063 break;
3064 case TIOCL_SETVESABLANK:
20f62579 3065 console_lock();
403aac96 3066 ret = set_vesa_blanking(p);
20f62579 3067 console_unlock();
1da177e4 3068 break;
0ca07731 3069 case TIOCL_GETKMSGREDIRECT:
5ada918b 3070 data = vt_get_kmsg_redirect();
6987dc8a 3071 ret = put_user(data, p);
0ca07731 3072 break;
1da177e4
LT		 3073 case TIOCL_SETKMSGREDIRECT:
3074 if (!capable(CAP_SYS_ADMIN)) {
3075 ret = -EPERM;
3076 } else {
3077 if (get_user(data, p+1))
3078 ret = -EFAULT;
3079 else
5ada918b 3080 vt_kmsg_redirect(data);
1da177e4
LT		 3081 }
3082 break;
3083 case TIOCL_GETFGCONSOLE:
20f62579
AC		 3084 /* No locking needed as this is a transiently
3085 correct return anyway if the caller hasn't
3086 disabled switching */
1da177e4
LT		 3087 ret = fg_console;
3088 break;
3089 case TIOCL_SCROLLCONSOLE:
3090 if (get_user(lines, (s32 __user *)(p+4))) {
3091 ret = -EFAULT;
3092 } else {
20f62579
AC		 3093 /* Need the console lock here. Note that lots
3094 of other calls need fixing before the lock
3095 is actually useful ! */
3096 console_lock();
1da177e4 3097 scrollfront(vc_cons[fg_console].d, lines);
20f62579 3098 console_unlock();
1da177e4
LT		 3099 ret = 0;
3100 }
3101 break;
3102 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 3103 console_lock();
1da177e4
LT		 3104 ignore_poke = 1;
3105 do_blank_screen(0);
ac751efa 3106 console_unlock();
1da177e4
LT		 3107 break;
3108 case TIOCL_BLANKEDSCREEN:
3109 ret = console_blanked;
3110 break;
3111 default:
3112 ret = -EINVAL;
3113 break;
3114 }
3115 return ret;
3116}
3117
3118/*
3119 * /dev/ttyN handling
3120 */
3121
3122static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3123{
3124 int retval;
3125
3126 retval = do_con_write(tty, buf, count);
3127 con_flush_chars(tty);
3128
3129 return retval;
3130}
3131
5d19f546 3132static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 3133{
3134 if (in_interrupt())
5d19f546
AC		 3135 return 0; /* n_r3964 calls put_char() from interrupt context */
3136 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3137}
3138
3139static int con_write_room(struct tty_struct *tty)
3140{
3141 if (tty->stopped)
3142 return 0;
a88a69c9 3143 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3144}
3145
3146static int con_chars_in_buffer(struct tty_struct *tty)
3147{
3148 return 0; /* we're not buffering */
3149}
3150
3151/*
3152 * con_throttle and con_unthrottle are only used for
3153 * paste_selection(), which has to stuff in a large number of
3154 * characters...
3155 */
3156static void con_throttle(struct tty_struct *tty)
3157{
3158}
3159
3160static void con_unthrottle(struct tty_struct *tty)
3161{
3162 struct vc_data *vc = tty->driver_data;
3163
3164 wake_up_interruptible(&vc->paste_wait);
3165}
3166
3167/*
3168 * Turn the Scroll-Lock LED on when the tty is stopped
3169 */
3170static void con_stop(struct tty_struct *tty)
3171{
3172 int console_num;
3173 if (!tty)
3174 return;
3175 console_num = tty->index;
3176 if (!vc_cons_allocated(console_num))
3177 return;
079c9534 3178 vt_kbd_con_stop(console_num);
1da177e4
LT		 3179}
3180
3181/*
3182 * Turn the Scroll-Lock LED off when the console is started
3183 */
3184static void con_start(struct tty_struct *tty)
3185{
3186 int console_num;
3187 if (!tty)
3188 return;
3189 console_num = tty->index;
3190 if (!vc_cons_allocated(console_num))
3191 return;
079c9534 3192 vt_kbd_con_start(console_num);
1da177e4
LT		 3193}
3194
3195static void con_flush_chars(struct tty_struct *tty)
3196{
3197 struct vc_data *vc;
3198
3199 if (in_interrupt()) /* from flush_to_ldisc */
3200 return;
3201
3202 /* if we race with con_close(), vt may be null */
ac751efa 3203 console_lock();
1da177e4
LT		 3204 vc = tty->driver_data;
3205 if (vc)
3206 set_cursor(vc);
ac751efa 3207 console_unlock();
1da177e4
LT		 3208}
3209
3210/*
3211 * Allocate the console screen memory.
3212 */
bc1e99d9 3213static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3214{
3215 unsigned int currcons = tty->index;
bc1e99d9
JS		 3216 struct vc_data *vc;
3217 int ret;
1da177e4 3218
ac751efa 3219 console_lock();
bc1e99d9
JS		 3220 ret = vc_allocate(currcons);
3221 if (ret)
3222 goto unlock;
feebed65 3223
bc1e99d9 3224 vc = vc_cons[currcons].d;
1da177e4 3225
bc1e99d9
JS		 3226 /* Still being freed */
3227 if (vc->port.tty) {
3228 ret = -ERESTARTSYS;
3229 goto unlock;
3230 }
3231
3232 ret = tty_port_install(&vc->port, driver, tty);
3233 if (ret)
3234 goto unlock;
3235
3236 tty->driver_data = vc;
3237 vc->port.tty = tty;
3238
3239 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3240 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3241 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3242 }
bc1e99d9 3243 if (vc->vc_utf)
adc8d746 3244 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3245 else
adc8d746 3246 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3247unlock:
ac751efa 3248 console_unlock();
1da177e4
LT		 3249 return ret;
3250}
3251
bc1e99d9
JS		 3252static int con_open(struct tty_struct *tty, struct file *filp)
3253{
3254 /* everything done in install */
3255 return 0;
3256}
3257
3258
1da177e4
LT		 3259static void con_close(struct tty_struct *tty, struct file *filp)
3260{
feebed65
AC		 3261 /* Nothing to do - we defer to shutdown */
3262}
1da177e4 3263
feebed65
AC		 3264static void con_shutdown(struct tty_struct *tty)
3265{
3266 struct vc_data *vc = tty->driver_data;
3267 BUG_ON(vc == NULL);
ac751efa 3268 console_lock();
8ce73264 3269 vc->port.tty = NULL;
ac751efa 3270 console_unlock();
1da177e4
LT		 3271}
3272
3855ae1c 3273static int default_color = 7; /* white */
fa6ce9ab
JE		 3274static int default_italic_color = 2; // green (ASCII)
3275static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3276module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3277module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3278module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3279
1da177e4
LT		 3280static void vc_init(struct vc_data *vc, unsigned int rows,
3281 unsigned int cols, int do_clear)
3282{
3283 int j, k ;
3284
3285 vc->vc_cols = cols;
3286 vc->vc_rows = rows;
3287 vc->vc_size_row = cols << 1;
3288 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3289
3290 set_origin(vc);
3291 vc->vc_pos = vc->vc_origin;
3292 reset_vc(vc);
3293 for (j=k=0; j<16; j++) {
3294 vc->vc_palette[k++] = default_red[j] ;
3295 vc->vc_palette[k++] = default_grn[j] ;
3296 vc->vc_palette[k++] = default_blu[j] ;
3297 }
3855ae1c 3298 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3299 vc->vc_ulcolor = default_underline_color;
3300 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3301 vc->vc_halfcolor = 0x08; /* grey */
3302 init_waitqueue_head(&vc->paste_wait);
3303 reset_terminal(vc, do_clear);
3304}
3305
3306/*
3307 * This routine initializes console interrupts, and does nothing
3308 * else. If you want the screen to clear, call tty_write with
3309 * the appropriate escape-sequence.
3310 */
3311
3312static int __init con_init(void)
3313{
3314 const char *display_desc = NULL;
3315 struct vc_data *vc;
3e795de7 3316 unsigned int currcons = 0, i;
1da177e4 3317
ac751efa 3318 console_lock();
1da177e4
LT		 3319
3320 if (conswitchp)
3321 display_desc = conswitchp->con_startup();
3322 if (!display_desc) {
3323 fg_console = 0;
ac751efa 3324 console_unlock();
1da177e4
LT		 3325 return 0;
3326 }
3327
3e795de7
AD		 3328 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3329 struct con_driver *con_driver = &registered_con_driver[i];
3330
3331 if (con_driver->con == NULL) {
3332 con_driver->con = conswitchp;
3333 con_driver->desc = display_desc;
3334 con_driver->flag = CON_DRIVER_FLAG_INIT;
3335 con_driver->first = 0;
3336 con_driver->last = MAX_NR_CONSOLES - 1;
3337 break;
3338 }
3339 }
3340
3341 for (i = 0; i < MAX_NR_CONSOLES; i++)
3342 con_driver_map[i] = conswitchp;
3343
1da177e4
LT		 3344 if (blankinterval) {
3345 blank_state = blank_normal_wait;
f324edc8 3346 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3347 }
3348
1da177e4 3349 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3350 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3351 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3352 tty_port_init(&vc->port);
1da177e4 3353 visual_init(vc, currcons, 1);
a5f4f52e 3354 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3355 vc_init(vc, vc->vc_rows, vc->vc_cols,
3356 currcons || !vc->vc_sw->con_save_screen);
3357 }
3358 currcons = fg_console = 0;
3359 master_display_fg = vc = vc_cons[currcons].d;
3360 set_origin(vc);
3361 save_screen(vc);
3362 gotoxy(vc, vc->vc_x, vc->vc_y);
3363 csi_J(vc, 0);
3364 update_screen(vc);
5da527aa 3365 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3366 vc->vc_can_do_color ? "colour" : "mono",
3367 display_desc, vc->vc_cols, vc->vc_rows);
3368 printable = 1;
1da177e4 3369
ac751efa 3370 console_unlock();
1da177e4
LT		 3371
3372#ifdef CONFIG_VT_CONSOLE
3373 register_console(&vt_console_driver);
3374#endif
3375 return 0;
3376}
3377console_initcall(con_init);
3378
b68e31d0 3379static const struct tty_operations con_ops = {
bc1e99d9 3380 .install = con_install,
1da177e4
LT		 3381 .open = con_open,
3382 .close = con_close,
3383 .write = con_write,
3384 .write_room = con_write_room,
3385 .put_char = con_put_char,
3386 .flush_chars = con_flush_chars,
3387 .chars_in_buffer = con_chars_in_buffer,
3388 .ioctl = vt_ioctl,
e9216651
AB		 3389#ifdef CONFIG_COMPAT
3390 .compat_ioctl = vt_compat_ioctl,
3391#endif
1da177e4
LT		 3392 .stop = con_stop,
3393 .start = con_start,
3394 .throttle = con_throttle,
3395 .unthrottle = con_unthrottle,
8c9a9dd0 3396 .resize = vt_resize,
feebed65 3397 .shutdown = con_shutdown
1da177e4
LT		 3398};
3399
d81ed103
AC		 3400static struct cdev vc0_cdev;
3401
fbc92a34
KS		 3402static ssize_t show_tty_active(struct device *dev,
3403 struct device_attribute *attr, char *buf)
3404{
3405 return sprintf(buf, "tty%d\n", fg_console + 1);
3406}
3407static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3408
1083a7be
TI		 3409static struct attribute *vt_dev_attrs[] = {
3410 &dev_attr_active.attr,
3411 NULL
3412};
3413
3414ATTRIBUTE_GROUPS(vt_dev);
3415
d81ed103 3416int __init vty_init(const struct file_operations *console_fops)
1da177e4 3417{
d81ed103
AC		 3418 cdev_init(&vc0_cdev, console_fops);
3419 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3420 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3421 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3422 tty0dev = device_create_with_groups(tty_class, NULL,
3423 MKDEV(TTY_MAJOR, 0), NULL,
3424 vt_dev_groups, "tty0");
fbc92a34
KS		 3425 if (IS_ERR(tty0dev))
3426 tty0dev = NULL;
d81ed103 3427
1da177e4
LT		 3428 vcs_init();
3429
3430 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3431 if (!console_driver)
3432 panic("Couldn't allocate console driver\n");
2f16669d 3433
1da177e4
LT		 3434 console_driver->name = "tty";
3435 console_driver->name_base = 1;
3436 console_driver->major = TTY_MAJOR;
3437 console_driver->minor_start = 1;
3438 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3439 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3440 if (default_utf8)
3441 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3442 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3443 tty_set_operations(console_driver, &con_ops);
3444 if (tty_register_driver(console_driver))
3445 panic("Couldn't register console driver\n");
1da177e4
LT		 3446 kbd_init();
3447 console_map_init();
1da177e4
LT		 3448#ifdef CONFIG_MDA_CONSOLE
3449 mda_console_init();
3450#endif
3451 return 0;
3452}
3453
3454#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3455
3456static struct class *vtconsole_class;
3457
50e244cc 3458static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3459 int deflt)
1da177e4 3460{
3e795de7
AD		 3461 struct module *owner = csw->owner;
3462 const char *desc = NULL;
3463 struct con_driver *con_driver;
3464 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3465
1da177e4
LT		 3466 if (!try_module_get(owner))
3467 return -ENODEV;
3468
50e244cc 3469 WARN_CONSOLE_UNLOCKED();
1c8ce271 3470
3e795de7
AD		 3471 /* check if driver is registered */
3472 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3473 con_driver = &registered_con_driver[i];
3474
3475 if (con_driver->con == csw) {
3476 desc = con_driver->desc;
3477 retval = 0;
3478 break;
3479 }
3480 }
3481
3482 if (retval)
3483 goto err;
3484
3485 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3486 csw->con_startup();
3487 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3488 }
1c8ce271 3489
1da177e4
LT		 3490 if (deflt) {
3491 if (conswitchp)
3492 module_put(conswitchp->owner);
1c8ce271 3493
1da177e4
LT		 3494 __module_get(owner);
3495 conswitchp = csw;
3496 }
3497
3e795de7
AD		 3498 first = max(first, con_driver->first);
3499 last = min(last, con_driver->last);
3500
1da177e4
LT		 3501 for (i = first; i <= last; i++) {
3502 int old_was_color;
3503 struct vc_data *vc = vc_cons[i].d;
3504
3505 if (con_driver_map[i])
3506 module_put(con_driver_map[i]->owner);
3507 __module_get(owner);
3508 con_driver_map[i] = csw;
3509
3510 if (!vc || !vc->vc_sw)
3511 continue;
3512
3513 j = i;
1c8ce271 3514
6ca8dfd7 3515 if (con_is_visible(vc)) {
4ee1acce 3516 k = i;
1da177e4 3517 save_screen(vc);
4ee1acce
DH		 3518 }
3519
1da177e4
LT		 3520 old_was_color = vc->vc_can_do_color;
3521 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3522 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3523 visual_init(vc, i, 0);
1c8ce271 3524 set_origin(vc);
1da177e4
LT		 3525 update_attr(vc);
3526
3527 /* If the console changed between mono <-> color, then
3528 * the attributes in the screenbuf will be wrong. The
3529 * following resets all attributes to something sane.
3530 */
3531 if (old_was_color != vc->vc_can_do_color)
3532 clear_buffer_attributes(vc);
1da177e4 3533 }
4ee1acce 3534
1ffdda95 3535 pr_info("Console: switching ");
1da177e4 3536 if (!deflt)
bccf1da3 3537 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3538 if (j >= 0) {
3539 struct vc_data *vc = vc_cons[j].d;
3540
bccf1da3
JP		 3541 pr_cont("to %s %s %dx%d\n",
3542 vc->vc_can_do_color ? "colour" : "mono",
3543 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3544
3545 if (k >= 0) {
3546 vc = vc_cons[k].d;
3547 update_screen(vc);
3548 }
bccf1da3
JP		 3549 } else {
3550 pr_cont("to %s\n", desc);
3551 }
1da177e4 3552
3e795de7
AD		 3553 retval = 0;
3554err:
1da177e4 3555 module_put(owner);
3e795de7
AD		 3556 return retval;
3557};
1da177e4 3558
50e244cc 3559
13ae6645 3560#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3561/* unlocked version of unbind_con_driver() */
3562int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3563{
3e795de7
AD		 3564 struct module *owner = csw->owner;
3565 const struct consw *defcsw = NULL;
3566 struct con_driver *con_driver = NULL, *con_back = NULL;
3567 int i, retval = -ENODEV;
1da177e4 3568
3e795de7
AD		 3569 if (!try_module_get(owner))
3570 return -ENODEV;
3571
e93a9a86 3572 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3573
3574 /* check if driver is registered and if it is unbindable */
3575 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3576 con_driver = &registered_con_driver[i];
3577
3578 if (con_driver->con == csw &&
6db4063c 3579 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3580 retval = 0;
3581 break;
3582 }
3583 }
3584
e93a9a86 3585 if (retval)
3e795de7 3586 goto err;
3e795de7 3587
6db4063c
AD		 3588 retval = -ENODEV;
3589
3e795de7
AD		 3590 /* check if backup driver exists */
3591 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3592 con_back = &registered_con_driver[i];
3593
249f7b3e 3594 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3595 defcsw = con_back->con;
3596 retval = 0;
3597 break;
3598 }
3599 }
3600
e93a9a86 3601 if (retval)
3e795de7 3602 goto err;
3e795de7 3603
e93a9a86 3604 if (!con_is_bound(csw))
3e795de7 3605 goto err;
3e795de7
AD		 3606
3607 first = max(first, con_driver->first);
3608 last = min(last, con_driver->last);
3609
3610 for (i = first; i <= last; i++) {
1da177e4
LT		 3611 if (con_driver_map[i] == csw) {
3612 module_put(csw->owner);
3613 con_driver_map[i] = NULL;
3614 }
3e795de7
AD		 3615 }
3616
3617 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3618 const struct consw *defconsw = conswitchp;
3619
3e795de7
AD		 3620 defcsw->con_startup();
3621 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3622 /*
3623 * vgacon may change the default driver to point
3624 * to dummycon, we restore it here...
3625 */
3626 conswitchp = defconsw;
3e795de7
AD		 3627 }
3628
3629 if (!con_is_bound(csw))
3630 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3631
6db4063c 3632 /* ignore return value, binding should not fail */
50e244cc 3633 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3634err:
3635 module_put(owner);
3636 return retval;
3637
3638}
e93a9a86 3639EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3640
6db4063c
AD		 3641static int vt_bind(struct con_driver *con)
3642{
3643 const struct consw *defcsw = NULL, *csw = NULL;
3644 int i, more = 1, first = -1, last = -1, deflt = 0;
3645
77232f79 3646 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3647 goto err;
3648
3649 csw = con->con;
3650
3651 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3652 struct con_driver *con = &registered_con_driver[i];
3653
3654 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3655 defcsw = con->con;
3656 break;
3657 }
3658 }
3659
3660 if (!defcsw)
3661 goto err;
3662
3663 while (more) {
3664 more = 0;
3665
3666 for (i = con->first; i <= con->last; i++) {
3667 if (con_driver_map[i] == defcsw) {
3668 if (first == -1)
3669 first = i;
3670 last = i;
3671 more = 1;
3672 } else if (first != -1)
3673 break;
3674 }
3675
3676 if (first == 0 && last == MAX_NR_CONSOLES -1)
3677 deflt = 1;
3678
4c215fe8 3679 if (first != -1)
c62a1e57 3680 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3681
3682 first = -1;
3683 last = -1;
3684 deflt = 0;
3685 }
3686
3687err:
3688 return 0;
3689}
3690
3691static int vt_unbind(struct con_driver *con)
3692{
3693 const struct consw *csw = NULL;
3694 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3695 int ret;
6db4063c 3696
77232f79 3697 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3698 goto err;
3699
3700 csw = con->con;
3701
3702 while (more) {
3703 more = 0;
3704
3705 for (i = con->first; i <= con->last; i++) {
3706 if (con_driver_map[i] == csw) {
3707 if (first == -1)
3708 first = i;
3709 last = i;
3710 more = 1;
3711 } else if (first != -1)
3712 break;
3713 }
3714
3715 if (first == 0 && last == MAX_NR_CONSOLES -1)
3716 deflt = 1;
3717
618f2b90 3718 if (first != -1) {
f418f2ec 3719 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3720 if (ret != 0)
3721 return ret;
618f2b90 3722 }
6db4063c
AD		 3723
3724 first = -1;
3725 last = -1;
3726 deflt = 0;
3727 }
3728
3729err:
3730 return 0;
3731}
13ae6645
AD		 3732#else
3733static inline int vt_bind(struct con_driver *con)
3734{
3735 return 0;
3736}
3737static inline int vt_unbind(struct con_driver *con)
3738{
3739 return 0;
3740}
3741#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3742
805952a8 3743static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3744 const char *buf, size_t count)
3745{
805952a8 3746 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3747 int bind = simple_strtoul(buf, NULL, 0);
3748
4c215fe8
ID		 3749 console_lock();
3750
6db4063c
AD		 3751 if (bind)
3752 vt_bind(con);
3753 else
3754 vt_unbind(con);
3755
4c215fe8
ID		 3756 console_unlock();
3757
6db4063c
AD		 3758 return count;
3759}
3760
805952a8
GKH		 3761static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3762 char *buf)
6db4063c 3763{
805952a8 3764 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3765 int bind = con_is_bound(con->con);
3766
3767 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3768}
3769
805952a8
GKH		 3770static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3771 char *buf)
6db4063c 3772{
805952a8 3773 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3774
3775 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3776 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3777 con->desc);
3778
3779}
3780
1083a7be
TI		 3781static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3782static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3783
3784static struct attribute *con_dev_attrs[] = {
3785 &dev_attr_bind.attr,
3786 &dev_attr_name.attr,
3787 NULL
6db4063c
AD		 3788};
3789
1083a7be
TI		 3790ATTRIBUTE_GROUPS(con_dev);
3791
805952a8 3792static int vtconsole_init_device(struct con_driver *con)
6db4063c 3793{
928e964f 3794 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3795 return 0;
6db4063c
AD		 3796}
3797
805952a8 3798static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3799{
1083a7be 3800 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3801}
3802
3e795de7
AD		 3803/**
3804 * con_is_bound - checks if driver is bound to the console
3805 * @csw: console driver
3806 *
3807 * RETURNS: zero if unbound, nonzero if bound
3808 *
3809 * Drivers can call this and if zero, they should release
3810 * all resources allocated on con_startup()
3811 */
3812int con_is_bound(const struct consw *csw)
3813{
3814 int i, bound = 0;
3815
3816 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3817 if (con_driver_map[i] == csw) {
3818 bound = 1;
3819 break;
3820 }
3821 }
3822
3823 return bound;
3824}
3825EXPORT_SYMBOL(con_is_bound);
3826
b45cfba4
JB		 3827/**
3828 * con_debug_enter - prepare the console for the kernel debugger
3829 * @sw: console driver
3830 *
3831 * Called when the console is taken over by the kernel debugger, this
3832 * function needs to save the current console state, then put the console
3833 * into a state suitable for the kernel debugger.
3834 *
3835 * RETURNS:
3836 * Zero on success, nonzero if a failure occurred when trying to prepare
3837 * the console for the debugger.
3838 */
3839int con_debug_enter(struct vc_data *vc)
3840{
3841 int ret = 0;
3842
3843 saved_fg_console = fg_console;
3844 saved_last_console = last_console;
3845 saved_want_console = want_console;
3846 saved_vc_mode = vc->vc_mode;
beed5336 3847 saved_console_blanked = console_blanked;
b45cfba4
JB		 3848 vc->vc_mode = KD_TEXT;
3849 console_blanked = 0;
3850 if (vc->vc_sw->con_debug_enter)
3851 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3852#ifdef CONFIG_KGDB_KDB
3853 /* Set the initial LINES variable if it is not already set */
3854 if (vc->vc_rows < 999) {
3855 int linecount;
3856 char lns[4];
3857 const char *setargs[3] = {
3858 "set",
3859 "LINES",
3860 lns,
3861 };
3862 if (kdbgetintenv(setargs[0], &linecount)) {
3863 snprintf(lns, 4, "%i", vc->vc_rows);
3864 kdb_set(2, setargs);
3865 }
3866 }
17b572e8
JW		 3867 if (vc->vc_cols < 999) {
3868 int colcount;
3869 char cols[4];
3870 const char *setargs[3] = {
3871 "set",
3872 "COLUMNS",
3873 cols,
3874 };
3875 if (kdbgetintenv(setargs[0], &colcount)) {
3876 snprintf(cols, 4, "%i", vc->vc_cols);
3877 kdb_set(2, setargs);
3878 }
3879 }
81d44507 3880#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3881 return ret;
3882}
3883EXPORT_SYMBOL_GPL(con_debug_enter);
3884
3885/**
3886 * con_debug_leave - restore console state
3887 * @sw: console driver
3888 *
3889 * Restore the console state to what it was before the kernel debugger
3890 * was invoked.
3891 *
3892 * RETURNS:
3893 * Zero on success, nonzero if a failure occurred when trying to restore
3894 * the console.
3895 */
3896int con_debug_leave(void)
3897{
3898 struct vc_data *vc;
3899 int ret = 0;
3900
3901 fg_console = saved_fg_console;
3902 last_console = saved_last_console;
3903 want_console = saved_want_console;
beed5336 3904 console_blanked = saved_console_blanked;
b45cfba4
JB		 3905 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3906
3907 vc = vc_cons[fg_console].d;
3908 if (vc->vc_sw->con_debug_leave)
3909 ret = vc->vc_sw->con_debug_leave(vc);
3910 return ret;
3911}
3912EXPORT_SYMBOL_GPL(con_debug_leave);
3913
50e244cc 3914static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3915{
3916 struct module *owner = csw->owner;
3917 struct con_driver *con_driver;
3918 const char *desc;
96317e9e 3919 int i, retval;
3e795de7 3920
50e244cc
AC		 3921 WARN_CONSOLE_UNLOCKED();
3922
3e795de7
AD		 3923 if (!try_module_get(owner))
3924 return -ENODEV;
3925
3e795de7
AD		 3926 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3927 con_driver = &registered_con_driver[i];
3928
3929 /* already registered */
96317e9e 3930 if (con_driver->con == csw) {
c55c63c6 3931 retval = -EBUSY;
96317e9e
JS		 3932 goto err;
3933 }
3e795de7
AD		 3934 }
3935
3e795de7 3936 desc = csw->con_startup();
6798df4c
JS		 3937 if (!desc) {
3938 retval = -ENODEV;
3e795de7 3939 goto err;
6798df4c 3940 }
3e795de7
AD		 3941
3942 retval = -EINVAL;
3943
3944 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3945 con_driver = &registered_con_driver[i];
3946
d364b5c3
ID		 3947 if (con_driver->con == NULL &&
3948 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3949 con_driver->con = csw;
3950 con_driver->desc = desc;
6db4063c
AD		 3951 con_driver->node = i;
3952 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3953 CON_DRIVER_FLAG_INIT;
3954 con_driver->first = first;
3955 con_driver->last = last;
3956 retval = 0;
3957 break;
3958 }
3959 }
3960
6db4063c
AD		 3961 if (retval)
3962 goto err;
3963
1083a7be
TI		 3964 con_driver->dev =
3965 device_create_with_groups(vtconsole_class, NULL,
3966 MKDEV(0, con_driver->node),
3967 con_driver, con_dev_groups,
3968 "vtcon%i", con_driver->node);
805952a8 3969 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 3970 pr_warn("Unable to create device for %s; errno = %ld\n",
3971 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 3972 con_driver->dev = NULL;
6db4063c 3973 } else {
805952a8 3974 vtconsole_init_device(con_driver);
6db4063c 3975 }
928e964f 3976
3e795de7 3977err:
3e795de7
AD		 3978 module_put(owner);
3979 return retval;
3980}
50e244cc 3981
3e795de7
AD		 3982
3983/**
50539dd4 3984 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3985 * @csw: console driver
3986 *
3987 * DESCRIPTION: All drivers that registers to the console layer must
3988 * call this function upon exit, or if the console driver is in a state
3989 * where it won't be able to handle console services, such as the
3990 * framebuffer console without loaded framebuffer drivers.
3991 *
3992 * The driver must unbind first prior to unregistration.
3993 */
e93a9a86
TI		 3994int do_unregister_con_driver(const struct consw *csw)
3995{
d9c660e7 3996 int i;
3e795de7
AD		 3997
3998 /* cannot unregister a bound driver */
3999 if (con_is_bound(csw))
d9c660e7
DV		 4000 return -EBUSY;
4001
4002 if (csw == conswitchp)
4003 return -EINVAL;
3e795de7
AD		 4004
4005 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4006 struct con_driver *con_driver = &registered_con_driver[i];
4007
2cf30f75 4008 if (con_driver->con == csw) {
d364b5c3
ID		 4009 /*
4010 * Defer the removal of the sysfs entries since that
4011 * will acquire the kernfs s_active lock and we can't
4012 * acquire this lock while holding the console lock:
4013 * the unbind sysfs entry imposes already the opposite
4014 * order. Reset con already here to prevent any later
4015 * lookup to succeed and mark this slot as zombie, so
4016 * it won't get reused until we complete the removal
4017 * in the deferred work.
4018 */
3e795de7 4019 con_driver->con = NULL;
d364b5c3
ID		 4020 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4021 schedule_work(&con_driver_unregister_work);
4022
d9c660e7 4023 return 0;
3e795de7
AD		 4024 }
4025 }
d9c660e7
DV		 4026
4027 return -ENODEV;
3e795de7 4028}
e93a9a86 4029EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4030
d364b5c3
ID		 4031static void con_driver_unregister_callback(struct work_struct *ignored)
4032{
4033 int i;
4034
4035 console_lock();
4036
4037 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4038 struct con_driver *con_driver = &registered_con_driver[i];
4039
4040 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4041 continue;
4042
4043 console_unlock();
4044
4045 vtconsole_deinit_device(con_driver);
4046 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4047
4048 console_lock();
4049
4050 if (WARN_ON_ONCE(con_driver->con))
4051 con_driver->con = NULL;
4052 con_driver->desc = NULL;
4053 con_driver->dev = NULL;
4054 con_driver->node = 0;
4055 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4056 con_driver->flag = 0;
4057 con_driver->first = 0;
4058 con_driver->last = 0;
4059 }
4060
4061 console_unlock();
4062}
4063
3e795de7
AD		 4064/*
4065 * If we support more console drivers, this function is used
4066 * when a driver wants to take over some existing consoles
4067 * and become default driver for newly opened ones.
4068 *
155957f5 4069 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 4070 */
4071int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4072{
4073 int err;
4074
4075 err = do_register_con_driver(csw, first, last);
4076 /*
4077 * If we get an busy error we still want to bind the console driver
4078 * and return success, as we may have unbound the console driver
4079 * but not unregistered it.
4080 */
4081 if (err == -EBUSY)
4082 err = 0;
4083 if (!err)
4084 do_bind_con_driver(csw, first, last, deflt);
4085
4086 return err;
4087}
4088EXPORT_SYMBOL_GPL(do_take_over_console);
4089
3e795de7
AD		 4090
4091/*
4092 * give_up_console is a wrapper to unregister_con_driver. It will only
4093 * work if driver is fully unbound.
4094 */
4095void give_up_console(const struct consw *csw)
4096{
70125e76
WY		 4097 console_lock();
4098 do_unregister_con_driver(csw);
4099 console_unlock();
3e795de7
AD		 4100}
4101
6db4063c 4102static int __init vtconsole_class_init(void)
3e795de7 4103{
6db4063c 4104 int i;
3e795de7 4105
6db4063c
AD		 4106 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4107 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4108 pr_warn("Unable to create vt console class; errno = %ld\n",
4109 PTR_ERR(vtconsole_class));
6db4063c
AD		 4110 vtconsole_class = NULL;
4111 }
3e795de7 4112
6db4063c 4113 /* Add system drivers to sysfs */
3e795de7
AD		 4114 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4115 struct con_driver *con = &registered_con_driver[i];
4116
805952a8 4117 if (con->con && !con->dev) {
1083a7be
TI		 4118 con->dev =
4119 device_create_with_groups(vtconsole_class, NULL,
4120 MKDEV(0, con->node),
4121 con, con_dev_groups,
4122 "vtcon%i", con->node);
6db4063c 4123
805952a8 4124 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4125 pr_warn("Unable to create device for %s; errno = %ld\n",
4126 con->desc, PTR_ERR(con->dev));
805952a8 4127 con->dev = NULL;
6db4063c 4128 } else {
805952a8 4129 vtconsole_init_device(con);
6db4063c 4130 }
3e795de7 4131 }
3e795de7
AD		 4132 }
4133
3e795de7
AD		 4134 return 0;
4135}
6db4063c 4136postcore_initcall(vtconsole_class_init);
3e795de7 4137
1da177e4
LT		 4138#endif
4139
4140/*
4141 * Screen blanking
4142 */
4143
403aac96 4144static int set_vesa_blanking(char __user *p)
1da177e4 4145{
403aac96
YY		 4146 unsigned int mode;
4147
4148 if (get_user(mode, p + 1))
4149 return -EFAULT;
4150
4151 vesa_blank_mode = (mode < 4) ? mode : 0;
4152 return 0;
1da177e4
LT		 4153}
4154
1da177e4
LT		 4155void do_blank_screen(int entering_gfx)
4156{
4157 struct vc_data *vc = vc_cons[fg_console].d;
4158 int i;
4159
4160 WARN_CONSOLE_UNLOCKED();
4161
4162 if (console_blanked) {
4163 if (blank_state == blank_vesa_wait) {
4164 blank_state = blank_off;
d060a321 4165 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4166 }
4167 return;
4168 }
1da177e4
LT		 4169
4170 /* entering graphics mode? */
4171 if (entering_gfx) {
4172 hide_cursor(vc);
4173 save_screen(vc);
4174 vc->vc_sw->con_blank(vc, -1, 1);
4175 console_blanked = fg_console + 1;
b6e8f00f 4176 blank_state = blank_off;
1da177e4
LT		 4177 set_origin(vc);
4178 return;
4179 }
4180
b6e8f00f 4181 if (blank_state != blank_normal_wait)
4182 return;
4183 blank_state = blank_off;
4184
1da177e4
LT		 4185 /* don't blank graphics */
4186 if (vc->vc_mode != KD_TEXT) {
4187 console_blanked = fg_console + 1;
4188 return;
4189 }
4190
4191 hide_cursor(vc);
4192 del_timer_sync(&console_timer);
4193 blank_timer_expired = 0;
4194
4195 save_screen(vc);
4196 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4197 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4198 console_blanked = fg_console + 1;
4199 if (i)
4200 set_origin(vc);
4201
4202 if (console_blank_hook && console_blank_hook(1))
4203 return;
4204
d060a321 4205 if (vesa_off_interval && vesa_blank_mode) {
030babac 4206 blank_state = blank_vesa_wait;
1da177e4
LT		 4207 mod_timer(&console_timer, jiffies + vesa_off_interval);
4208 }
8b92e87d 4209 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4210}
4211EXPORT_SYMBOL(do_blank_screen);
4212
4213/*
4214 * Called by timer as well as from vt_console_driver
4215 */
4216void do_unblank_screen(int leaving_gfx)
4217{
4218 struct vc_data *vc;
4219
4220 /* This should now always be called from a "sane" (read: can schedule)
4221 * context for the sake of the low level drivers, except in the special
4222 * case of oops_in_progress
4223 */
4224 if (!oops_in_progress)
4225 might_sleep();
4226
4227 WARN_CONSOLE_UNLOCKED();
4228
4229 ignore_poke = 0;
4230 if (!console_blanked)
4231 return;
4232 if (!vc_cons_allocated(fg_console)) {
4233 /* impossible */
e620e548
JP		 4234 pr_warn("unblank_screen: tty %d not allocated ??\n",
4235 fg_console + 1);
1da177e4
LT		 4236 return;
4237 }
4238 vc = vc_cons[fg_console].d;
8d7fc299 4239 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4240 return; /* but leave console_blanked != 0 */
4241
4242 if (blankinterval) {
f324edc8 4243 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4244 blank_state = blank_normal_wait;
4245 }
4246
4247 console_blanked = 0;
8d7fc299 4248 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4249 /* Low-level driver cannot restore -> do it ourselves */
4250 update_screen(vc);
4251 if (console_blank_hook)
4252 console_blank_hook(0);
4253 set_palette(vc);
4254 set_cursor(vc);
8b92e87d 4255 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4256}
4257EXPORT_SYMBOL(do_unblank_screen);
4258
4259/*
4260 * This is called by the outside world to cause a forced unblank, mostly for
4261 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4262 * call it with 1 as an argument and so force a mode restore... that may kill
4263 * X or at least garbage the screen but would also make the Oops visible...
4264 */
4265void unblank_screen(void)
4266{
4267 do_unblank_screen(0);
4268}
4269
4270/*
70522e12 4271 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4272 * (console operations can still happen at irq time, but only from printk which
70522e12 4273 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4274 */
24ed960a 4275static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4276{
4277 blank_timer_expired = 1;
4278 schedule_work(&console_work);
4279}
4280
4281void poke_blanked_console(void)
4282{
4283 WARN_CONSOLE_UNLOCKED();
4284
4285 /* Add this so we quickly catch whoever might call us in a non
4286 * safe context. Nowadays, unblank_screen() isn't to be called in
4287 * atomic contexts and is allowed to schedule (with the special case
4288 * of oops_in_progress, but that isn't of any concern for this
4289 * function. --BenH.
4290 */
4291 might_sleep();
4292
4293 /* This isn't perfectly race free, but a race here would be mostly harmless,
4294 * at worse, we'll do a spurrious blank and it's unlikely
4295 */
4296 del_timer(&console_timer);
4297 blank_timer_expired = 0;
4298
4299 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4300 return;
4301 if (console_blanked)
4302 unblank_screen();
4303 else if (blankinterval) {
f324edc8 4304 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4305 blank_state = blank_normal_wait;
4306 }
4307}
4308
4309/*
4310 * Palettes
4311 */
4312
4313static void set_palette(struct vc_data *vc)
4314{
4315 WARN_CONSOLE_UNLOCKED();
4316
709280da 4317 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4318 vc->vc_sw->con_set_palette(vc, color_table);
4319}
4320
1da177e4
LT		 4321/*
4322 * Load palette into the DAC registers. arg points to a colour
4323 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4324 */
4325
4326int con_set_cmap(unsigned char __user *arg)
4327{
871bdea6
MG		 4328 int i, j, k;
4329 unsigned char colormap[3*16];
4330
4331 if (copy_from_user(colormap, arg, sizeof(colormap)))
4332 return -EFAULT;
1da177e4 4333
ac751efa 4334 console_lock();
871bdea6
MG		 4335 for (i = k = 0; i < 16; i++) {
4336 default_red[i] = colormap[k++];
4337 default_grn[i] = colormap[k++];
4338 default_blu[i] = colormap[k++];
4339 }
4340 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4341 if (!vc_cons_allocated(i))
4342 continue;
4343 for (j = k = 0; j < 16; j++) {
4344 vc_cons[i].d->vc_palette[k++] = default_red[j];
4345 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4346 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4347 }
4348 set_palette(vc_cons[i].d);
4349 }
ac751efa 4350 console_unlock();
1da177e4 4351
871bdea6 4352 return 0;
1da177e4
LT		 4353}
4354
4355int con_get_cmap(unsigned char __user *arg)
4356{
871bdea6
MG		 4357 int i, k;
4358 unsigned char colormap[3*16];
1da177e4 4359
ac751efa 4360 console_lock();
871bdea6
MG		 4361 for (i = k = 0; i < 16; i++) {
4362 colormap[k++] = default_red[i];
4363 colormap[k++] = default_grn[i];
4364 colormap[k++] = default_blu[i];
4365 }
ac751efa 4366 console_unlock();
1da177e4 4367
871bdea6
MG		 4368 if (copy_to_user(arg, colormap, sizeof(colormap)))
4369 return -EFAULT;
4370
4371 return 0;
1da177e4
LT		 4372}
4373
4374void reset_palette(struct vc_data *vc)
4375{
4376 int j, k;
4377 for (j=k=0; j<16; j++) {
4378 vc->vc_palette[k++] = default_red[j];
4379 vc->vc_palette[k++] = default_grn[j];
4380 vc->vc_palette[k++] = default_blu[j];
4381 }
4382 set_palette(vc);
4383}
4384
4385/*
4386 * Font switching
4387 *
4388 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4389 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4390 * depending on width) reserved for each character which is kinda wasty, but
4391 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4392 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4393 * format (maybe we should add a `fontoffset' field to the `display'
4394 * structure so we won't have to convert the fontdata all the time.
4395 * /Jes
4396 */
4397
4398#define max_font_size 65536
4399
4400static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4401{
4402 struct console_font font;
4403 int rc = -EINVAL;
4404 int c;
4405
1da177e4
LT		 4406 if (op->data) {
4407 font.data = kmalloc(max_font_size, GFP_KERNEL);
4408 if (!font.data)
4409 return -ENOMEM;
4410 } else
4411 font.data = NULL;
4412
ac751efa 4413 console_lock();
edab558f
AC		 4414 if (vc->vc_mode != KD_TEXT)
4415 rc = -EINVAL;
4416 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4417 rc = vc->vc_sw->con_font_get(vc, &font);
4418 else
4419 rc = -ENOSYS;
ac751efa 4420 console_unlock();
1da177e4
LT		 4421
4422 if (rc)
4423 goto out;
4424
4425 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4426
1da177e4
LT		 4427 if (op->data && font.charcount > op->charcount)
4428 rc = -ENOSPC;
4429 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4430 if (font.width > op->width || font.height > op->height)
4431 rc = -ENOSPC;
4432 } else {
4433 if (font.width != 8)
4434 rc = -EIO;
4435 else if ((op->height && font.height > op->height) ||
4436 font.height > 32)
4437 rc = -ENOSPC;
4438 }
4439 if (rc)
4440 goto out;
4441
4442 op->height = font.height;
4443 op->width = font.width;
4444 op->charcount = font.charcount;
4445
4446 if (op->data && copy_to_user(op->data, font.data, c))
4447 rc = -EFAULT;
4448
4449out:
4450 kfree(font.data);
4451 return rc;
4452}
4453
4454static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4455{
4456 struct console_font font;
4457 int rc = -EINVAL;
4458 int size;
4459
4460 if (vc->vc_mode != KD_TEXT)
4461 return -EINVAL;
4462 if (!op->data)
4463 return -EINVAL;
4464 if (op->charcount > 512)
4465 return -EINVAL;
8ffb8209
MX		 4466 if (op->width <= 0 || op->width > 32 || op->height > 32)
4467 return -EINVAL;
4468 size = (op->width+7)/8 * 32 * op->charcount;
4469 if (size > max_font_size)
4470 return -ENOSPC;
4471
4472 font.data = memdup_user(op->data, size);
4473 if (IS_ERR(font.data))
4474 return PTR_ERR(font.data);
4475
1da177e4
LT		 4476 if (!op->height) { /* Need to guess font height [compat] */
4477 int h, i;
8ffb8209
MX		 4478 u8 *charmap = font.data;
4479
4480 /*
4481 * If from KDFONTOP ioctl, don't allow things which can be done
4482 * in userland,so that we can get rid of this soon
4483 */
4484 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4485 kfree(font.data);
1da177e4 4486 return -EINVAL;
8ffb8209
MX		 4487 }
4488
1da177e4 4489 for (h = 32; h > 0; h--)
8ffb8209
MX		 4490 for (i = 0; i < op->charcount; i++)
4491 if (charmap[32*i+h-1])
1da177e4 4492 goto nonzero;
8ffb8209
MX		 4493
4494 kfree(font.data);
1da177e4 4495 return -EINVAL;
8ffb8209 4496
1da177e4
LT		 4497 nonzero:
4498 op->height = h;
4499 }
8ffb8209 4500
1da177e4 4501 font.charcount = op->charcount;
1da177e4 4502 font.width = op->width;
8ffb8209
MX		 4503 font.height = op->height;
4504
ac751efa 4505 console_lock();
edab558f
AC		 4506 if (vc->vc_mode != KD_TEXT)
4507 rc = -EINVAL;
4508 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4509 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4510 else
4511 rc = -ENOSYS;
ac751efa 4512 console_unlock();
1da177e4
LT		 4513 kfree(font.data);
4514 return rc;
4515}
4516
4517static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4518{
4519 struct console_font font = {.width = op->width, .height = op->height};
4520 char name[MAX_FONT_NAME];
4521 char *s = name;
4522 int rc;
4523
1da177e4
LT		 4524
4525 if (!op->data)
4526 s = NULL;
4527 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4528 return -EFAULT;
4529 else
4530 name[MAX_FONT_NAME - 1] = 0;
4531
ac751efa 4532 console_lock();
edab558f
AC		 4533 if (vc->vc_mode != KD_TEXT) {
4534 console_unlock();
4535 return -EINVAL;
4536 }
1da177e4
LT		 4537 if (vc->vc_sw->con_font_default)
4538 rc = vc->vc_sw->con_font_default(vc, &font, s);
4539 else
4540 rc = -ENOSYS;
ac751efa 4541 console_unlock();
1da177e4
LT		 4542 if (!rc) {
4543 op->width = font.width;
4544 op->height = font.height;
4545 }
4546 return rc;
4547}
4548
4549static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4550{
4551 int con = op->height;
4552 int rc;
4553
1da177e4 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_copy)
1da177e4
LT		 4559 rc = -ENOSYS;
4560 else if (con < 0 || !vc_cons_allocated(con))
4561 rc = -ENOTTY;
4562 else if (con == vc->vc_num) /* nothing to do */
4563 rc = 0;
4564 else
4565 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4566 console_unlock();
1da177e4
LT		 4567 return rc;
4568}
4569
4570int con_font_op(struct vc_data *vc, struct console_font_op *op)
4571{
4572 switch (op->op) {
4573 case KD_FONT_OP_SET:
4574 return con_font_set(vc, op);
4575 case KD_FONT_OP_GET:
4576 return con_font_get(vc, op);
4577 case KD_FONT_OP_SET_DEFAULT:
4578 return con_font_default(vc, op);
4579 case KD_FONT_OP_COPY:
4580 return con_font_copy(vc, op);
4581 }
4582 return -ENOSYS;
4583}
4584
4585/*
4586 * Interface exported to selection and vcs.
4587 */
4588
4589/* used by selection */
4590u16 screen_glyph(struct vc_data *vc, int offset)
4591{
4592 u16 w = scr_readw(screenpos(vc, offset, 1));
4593 u16 c = w & 0xff;
4594
4595 if (w & vc->vc_hi_font_mask)
4596 c |= 0x100;
4597 return c;
4598}
f7511d5f 4599EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4600
9bfdc261
AB		 4601u32 screen_glyph_unicode(struct vc_data *vc, int n)
4602{
4603 struct uni_screen *uniscr = get_vc_uniscr(vc);
4604
4605 if (uniscr)
4606 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4607 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4608}
4609EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4610
1da177e4
LT		 4611/* used by vcs - note the word offset */
4612unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4613{
4614 return screenpos(vc, 2 * w_offset, viewed);
4615}
88867e3d 4616EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4617
4618void getconsxy(struct vc_data *vc, unsigned char *p)
4619{
8a085494
NP		 4620 /* clamp values if they don't fit */
4621 p[0] = min(vc->vc_x, 0xFFu);
4622 p[1] = min(vc->vc_y, 0xFFu);
1da177e4
LT		 4623}
4624
4625void putconsxy(struct vc_data *vc, unsigned char *p)
4626{
9477e260 4627 hide_cursor(vc);
1da177e4
LT		 4628 gotoxy(vc, p[0], p[1]);
4629 set_cursor(vc);
4630}
4631
4632u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4633{
4634 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4635 return softcursor_original;
4636 return scr_readw(org);
4637}
4638
4639void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4640{
4641 scr_writew(val, org);
4642 if ((unsigned long)org == vc->vc_pos) {
4643 softcursor_original = -1;
4644 add_softcursor(vc);
4645 }
4646}
4647
432c9ed2
NP		 4648void vcs_scr_updated(struct vc_data *vc)
4649{
4650 notify_update(vc);
4651}
4652
35cc56f9
JS		 4653void vc_scrolldelta_helper(struct vc_data *c, int lines,
4654 unsigned int rolled_over, void *base, unsigned int size)
4655{
4656 unsigned long ubase = (unsigned long)base;
210fd746
JS		 4657 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4658 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4659 ptrdiff_t origin = (void *)c->vc_origin - base;
35cc56f9 4660 int margin = c->vc_size_row * 4;
7c918cdc 4661 int from, wrap, from_off, avail;
35cc56f9
JS		 4662
4663 /* Turn scrollback off */
4664 if (!lines) {
4665 c->vc_visible_origin = c->vc_origin;
4666 return;
4667 }
4668
4669 /* Do we have already enough to allow jumping from 0 to the end? */
210fd746 4670 if (rolled_over > scr_end + margin) {
7c918cdc
JS		 4671 from = scr_end;
4672 wrap = rolled_over + c->vc_size_row;
35cc56f9 4673 } else {
7c918cdc
JS		 4674 from = 0;
4675 wrap = size;
35cc56f9
JS		 4676 }
4677
7c918cdc
JS		 4678 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4679 avail = (origin - from + wrap) % wrap;
35cc56f9
JS		 4680
4681 /* Only a little piece would be left? Show all incl. the piece! */
7c918cdc 4682 if (avail < 2 * margin)
35cc56f9 4683 margin = 0;
7c918cdc
JS		 4684 if (from_off < margin)
4685 from_off = 0;
4686 if (from_off > avail - margin)
4687 from_off = avail;
35cc56f9 4688
7c918cdc 4689 c->vc_visible_origin = ubase + (from + from_off) % wrap;
35cc56f9
JS		 4690}
4691EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4692
1da177e4
LT		 4693/*
4694 * Visible symbols for modules
4695 */
4696
4697EXPORT_SYMBOL(color_table);
4698EXPORT_SYMBOL(default_red);
4699EXPORT_SYMBOL(default_grn);
4700EXPORT_SYMBOL(default_blu);
4701EXPORT_SYMBOL(update_region);
4702EXPORT_SYMBOL(redraw_screen);
4703EXPORT_SYMBOL(vc_resize);
4704EXPORT_SYMBOL(fg_console);
4705EXPORT_SYMBOL(console_blank_hook);
4706EXPORT_SYMBOL(console_blanked);
4707EXPORT_SYMBOL(vc_cons);
f6c06b68 4708EXPORT_SYMBOL(global_cursor_default);
1da177e4 4709#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4710EXPORT_SYMBOL(give_up_console);
4711#endif
A mirror of Linus' kernel repository