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Merge tag 'asoc-v5.7' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[mirror_ubuntu-hirsute-kernel.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);
3f4ef485 939 if (vc->vc_sw->con_flush_scrollback) {
bcd375f7 940 vc->vc_sw->con_flush_scrollback(vc);
3f4ef485
NP		 941 } else if (con_is_visible(vc)) {
942 /*
943 * When no con_flush_scrollback method is provided then the
944 * legacy way for flushing the scrollback buffer is to use
945 * a side effect of the con_switch method. We do it only on
946 * the foreground console as background consoles have no
947 * scrollback buffers in that case and we obviously don't
948 * want to switch to them.
949 */
950 hide_cursor(vc);
a6dbe442 951 vc->vc_sw->con_switch(vc);
3f4ef485
NP		 952 set_cursor(vc);
953 }
bcd375f7
MS		 954}
955
1da177e4
LT		 956/*
957 * Redrawing of screen
958 */
959
2a248307 960void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 961{
962 unsigned short *p = (unsigned short *)vc->vc_origin;
963 int count = vc->vc_screenbuf_size / 2;
964 int mask = vc->vc_hi_font_mask | 0xff;
965
966 for (; count > 0; count--, p++) {
967 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
968 }
969}
970
971void redraw_screen(struct vc_data *vc, int is_switch)
972{
973 int redraw = 0;
974
975 WARN_CONSOLE_UNLOCKED();
976
977 if (!vc) {
978 /* strange ... */
979 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
980 return;
981 }
982
983 if (is_switch) {
984 struct vc_data *old_vc = vc_cons[fg_console].d;
985 if (old_vc == vc)
986 return;
6ca8dfd7 987 if (!con_is_visible(vc))
1da177e4
LT		 988 redraw = 1;
989 *vc->vc_display_fg = vc;
990 fg_console = vc->vc_num;
991 hide_cursor(old_vc);
6ca8dfd7 992 if (!con_is_visible(old_vc)) {
1da177e4
LT		 993 save_screen(old_vc);
994 set_origin(old_vc);
995 }
fbc92a34
KS		 996 if (tty0dev)
997 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 998 } else {
999 hide_cursor(vc);
1000 redraw = 1;
1001 }
1002
1003 if (redraw) {
1004 int update;
1005 int old_was_color = vc->vc_can_do_color;
1006
1007 set_origin(vc);
1008 update = vc->vc_sw->con_switch(vc);
1009 set_palette(vc);
1010 /*
1011 * If console changed from mono<->color, the best we can do
1012 * is to clear the buffer attributes. As it currently stands,
1013 * rebuilding new attributes from the old buffer is not doable
1014 * without overly complex code.
1015 */
1016 if (old_was_color != vc->vc_can_do_color) {
1017 update_attr(vc);
1018 clear_buffer_attributes(vc);
1019 }
8fd4bd22 1020
8d7fc299 1021 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 1022 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1023 }
1024 set_cursor(vc);
1025 if (is_switch) {
1026 set_leds();
1027 compute_shiftstate();
8182ec49 1028 notify_update(vc);
1da177e4
LT		 1029 }
1030}
1031
1032/*
1033 * Allocation, freeing and resizing of VTs.
1034 */
1035
1036int vc_cons_allocated(unsigned int i)
1037{
1038 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1039}
1040
1041static void visual_init(struct vc_data *vc, int num, int init)
1042{
1043 /* ++Geert: vc->vc_sw->con_init determines console size */
1044 if (vc->vc_sw)
1045 module_put(vc->vc_sw->owner);
1046 vc->vc_sw = conswitchp;
1047#ifndef VT_SINGLE_DRIVER
1048 if (con_driver_map[num])
1049 vc->vc_sw = con_driver_map[num];
1050#endif
1051 __module_get(vc->vc_sw->owner);
1052 vc->vc_num = num;
1053 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 1054 if (vc->vc_uni_pagedir_loc)
1055 con_free_unimap(vc);
1da177e4 1056 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 1057 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 1058 vc->vc_hi_font_mask = 0;
1059 vc->vc_complement_mask = 0;
1060 vc->vc_can_do_color = 0;
1b45996d 1061 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1062 vc->vc_sw->con_init(vc, init);
1063 if (!vc->vc_complement_mask)
1064 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1065 vc->vc_s_complement_mask = vc->vc_complement_mask;
1066 vc->vc_size_row = vc->vc_cols << 1;
1067 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1068}
1069
a1ad1cc9
GH		 1070
1071static void visual_deinit(struct vc_data *vc)
1072{
1073 vc->vc_sw->con_deinit(vc);
1074 module_put(vc->vc_sw->owner);
1075}
1076
1da177e4
LT		 1077int vc_allocate(unsigned int currcons) /* return 0 on success */
1078{
34902b7f
JS		 1079 struct vt_notifier_param param;
1080 struct vc_data *vc;
1081
1da177e4
LT		 1082 WARN_CONSOLE_UNLOCKED();
1083
1084 if (currcons >= MAX_NR_CONSOLES)
1085 return -ENXIO;
34902b7f
JS		 1086
1087 if (vc_cons[currcons].d)
1088 return 0;
1089
1090 /* due to the granularity of kmalloc, we waste some memory here */
1091 /* the alloc is done in two steps, to optimize the common situation
1092 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1093 /* although the numbers above are not valid since long ago, the
1094 point is still up-to-date and the comment still has its value
1095 even if only as a historical artifact. --mj, July 1998 */
1096 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1097 if (!vc)
1da177e4 1098 return -ENOMEM;
34902b7f
JS		 1099
1100 vc_cons[currcons].d = vc;
1101 tty_port_init(&vc->port);
1102 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1103
1104 visual_init(vc, currcons, 1);
1105
1106 if (!*vc->vc_uni_pagedir_loc)
1da177e4 1107 con_set_default_unimap(vc);
f6c06b68 1108
21eff69a 1109 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1110 if (!vc->vc_screenbuf)
1111 goto err_free;
1112
1113 /* If no drivers have overridden us and the user didn't pass a
1114 boot option, default to displaying the cursor */
1115 if (global_cursor_default == -1)
1116 global_cursor_default = 1;
1117
1118 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1119 vcs_make_sysfs(currcons);
1120 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1121
1da177e4 1122 return 0;
34902b7f 1123err_free:
a1ad1cc9 1124 visual_deinit(vc);
34902b7f
JS		 1125 kfree(vc);
1126 vc_cons[currcons].d = NULL;
1127 return -ENOMEM;
1da177e4
LT		 1128}
1129
e400b6ec
AD		 1130static inline int resize_screen(struct vc_data *vc, int width, int height,
1131 int user)
1da177e4
LT		 1132{
1133 /* Resizes the resolution of the display adapater */
1134 int err = 0;
1135
1136 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 1137 err = vc->vc_sw->con_resize(vc, width, height, user);
1138
1da177e4
LT		 1139 return err;
1140}
1141
1142/*
1143 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1144 * [this is to be used together with some user program
1145 * like resize that changes the hardware videomode]
1146 */
1147#define VC_RESIZE_MAXCOL (32767)
1148#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 1149
1150/**
1151 * vc_do_resize - resizing method for the tty
1152 * @tty: tty being resized
1153 * @real_tty: real tty (different to tty if a pty/tty pair)
1154 * @vc: virtual console private data
1155 * @cols: columns
1156 * @lines: lines
1157 *
1158 * Resize a virtual console, clipping according to the actual constraints.
1159 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1160 * information and perform any necessary signal handling.
8c9a9dd0 1161 *
6a1c0680 1162 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 1163 * ctrl_lock of the tty IFF a tty is passed.
1164 */
1165
fc6f6238
AC		 1166static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1167 unsigned int cols, unsigned int lines)
1da177e4
LT		 1168{
1169 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1170 unsigned long end;
d8ae7242 1171 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1172 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1173 unsigned int user;
1da177e4 1174 unsigned short *newscreen;
d8ae7242 1175 struct uni_screen *new_uniscr = NULL;
1da177e4
LT		 1176
1177 WARN_CONSOLE_UNLOCKED();
1178
1179 if (!vc)
1180 return -ENXIO;
1181
e400b6ec
AD		 1182 user = vc->vc_resize_user;
1183 vc->vc_resize_user = 0;
1184
1da177e4
LT		 1185 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1186 return -EINVAL;
1187
1188 new_cols = (cols ? cols : vc->vc_cols);
1189 new_rows = (lines ? lines : vc->vc_rows);
1190 new_row_size = new_cols << 1;
1191 new_screen_size = new_row_size * new_rows;
1192
1193 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1194 return 0;
1195
32b2921e
DV		 1196 if (new_screen_size > (4 << 20))
1197 return -EINVAL;
21eff69a 1198 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1199 if (!newscreen)
1200 return -ENOMEM;
1201
d8ae7242
NP		 1202 if (get_vc_uniscr(vc)) {
1203 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1204 if (!new_uniscr) {
1205 kfree(newscreen);
1206 return -ENOMEM;
1207 }
1208 }
1209
009e39ae
SD		 1210 if (vc == sel_cons)
1211 clear_selection();
1212
1da177e4 1213 old_rows = vc->vc_rows;
1da177e4 1214 old_row_size = vc->vc_size_row;
1da177e4 1215
e400b6ec 1216 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1217 if (err) {
1218 kfree(newscreen);
d8ae7242 1219 kfree(new_uniscr);
1da177e4
LT		 1220 return err;
1221 }
1222
1223 vc->vc_rows = new_rows;
1224 vc->vc_cols = new_cols;
1225 vc->vc_size_row = new_row_size;
1226 vc->vc_screenbuf_size = new_screen_size;
1227
1228 rlth = min(old_row_size, new_row_size);
1229 rrem = new_row_size - rlth;
1230 old_origin = vc->vc_origin;
1231 new_origin = (long) newscreen;
1232 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 1233
1234 if (vc->vc_y > new_rows) {
1235 if (old_rows - vc->vc_y < new_rows) {
1236 /*
1237 * Cursor near the bottom, copy contents from the
1238 * bottom of buffer
1239 */
d8ae7242 1240 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1241 } else {
1242 /*
1243 * Cursor is in no man's land, copy 1/2 screenful
1244 * from the top and bottom of cursor position
1245 */
d8ae7242 1246 first_copied_row = (vc->vc_y - new_rows/2);
3b41dc1a 1247 }
d8ae7242
NP		 1248 old_origin += first_copied_row * old_row_size;
1249 } else
1250 first_copied_row = 0;
9fc2b2d0 1251 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1252
d8ae7242
NP		 1253 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1254 get_vc_uniscr(vc), rlth/2, first_copied_row,
1255 min(old_rows, new_rows));
1256 vc_uniscr_set(vc, new_uniscr);
1257
1da177e4
LT		 1258 update_attr(vc);
1259
3b41dc1a
AD		 1260 while (old_origin < end) {
1261 scr_memcpyw((unsigned short *) new_origin,
1262 (unsigned short *) old_origin, rlth);
1da177e4 1263 if (rrem)
3b41dc1a
AD		 1264 scr_memsetw((void *)(new_origin + rlth),
1265 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1266 old_origin += old_row_size;
1267 new_origin += new_row_size;
1268 }
1269 if (new_scr_end > new_origin)
3b41dc1a
AD		 1270 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1271 new_scr_end - new_origin);
5c9228f0 1272 kfree(vc->vc_screenbuf);
1da177e4 1273 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1274 vc->vc_screenbuf_size = new_screen_size;
1275 set_origin(vc);
1276
1277 /* do part of a reset_terminal() */
1278 vc->vc_top = 0;
1279 vc->vc_bottom = vc->vc_rows;
1280 gotoxy(vc, vc->vc_x, vc->vc_y);
1281 save_cur(vc);
1282
8c9a9dd0
AC		 1283 if (tty) {
1284 /* Rewrite the requested winsize data with the actual
1285 resulting sizes */
1286 struct winsize ws;
1da177e4
LT		 1287 memset(&ws, 0, sizeof(ws));
1288 ws.ws_row = vc->vc_rows;
1289 ws.ws_col = vc->vc_cols;
1290 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1291 tty_do_resize(tty, &ws);
1da177e4
LT		 1292 }
1293
6ca8dfd7 1294 if (con_is_visible(vc))
1da177e4 1295 update_screen(vc);
8b92e87d 1296 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
0c9b1965 1297 notify_update(vc);
1da177e4
LT		 1298 return err;
1299}
1300
8c9a9dd0
AC		 1301/**
1302 * vc_resize - resize a VT
1303 * @vc: virtual console
1304 * @cols: columns
1305 * @rows: rows
1306 *
1307 * Resize a virtual console as seen from the console end of things. We
1308 * use the common vc_do_resize methods to update the structures. The
1309 * caller must hold the console sem to protect console internals and
8ce73264 1310 * vc->port.tty
8c9a9dd0
AC		 1311 */
1312
1313int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1314{
8ce73264 1315 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 1316}
1317
1318/**
1319 * vt_resize - resize a VT
1320 * @tty: tty to resize
8c9a9dd0
AC		 1321 * @ws: winsize attributes
1322 *
1323 * Resize a virtual terminal. This is called by the tty layer as we
1324 * register our own handler for resizing. The mutual helper does all
1325 * the actual work.
1326 *
1327 * Takes the console sem and the called methods then take the tty
6a1c0680 1328 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 1329 */
da2bdf9a 1330static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1331{
8c9a9dd0
AC		 1332 struct vc_data *vc = tty->driver_data;
1333 int ret;
ca9bda00 1334
ac751efa 1335 console_lock();
fc6f6238 1336 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1337 console_unlock();
8c9a9dd0 1338 return ret;
ca9bda00 1339}
1da177e4 1340
421b40a6 1341struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1342{
421b40a6
PH		 1343 struct vc_data *vc = NULL;
1344
1da177e4
LT		 1345 WARN_CONSOLE_UNLOCKED();
1346
1347 if (vc_cons_allocated(currcons)) {
421b40a6 1348 struct vt_notifier_param param;
4995f8ef 1349
421b40a6 1350 param.vc = vc = vc_cons[currcons].d;
b293d758 1351 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1352 vcs_remove_sysfs(currcons);
a1ad1cc9 1353 visual_deinit(vc);
bde0d2c9 1354 put_pid(vc->vt_pid);
d8ae7242 1355 vc_uniscr_set(vc, NULL);
5c9228f0 1356 kfree(vc->vc_screenbuf);
1da177e4
LT		 1357 vc_cons[currcons].d = NULL;
1358 }
421b40a6 1359 return vc;
1da177e4
LT		 1360}
1361
1362/*
1363 * VT102 emulator
1364 */
1365
2ff5c5a1
MH		 1366enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1367
079c9534
AC		 1368#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1369#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1370#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1371
1372#define decarm VC_REPEAT
1373#define decckm VC_CKMODE
1374#define kbdapplic VC_APPLIC
1375#define lnm VC_CRLF
1376
1377/*
1378 * this is what the terminal answers to a ESC-Z or csi0c query.
1379 */
1380#define VT100ID "\033[?1;2c"
1381#define VT102ID "\033[?6c"
1382
8ede5cce 1383const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1384 8,12,10,14, 9,13,11,15 };
1385
1386/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1387unsigned char default_red[] = {
1388 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1389 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1390};
1391module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1392
1393unsigned char default_grn[] = {
1394 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1395 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1396};
1397module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1398
1399unsigned char default_blu[] = {
1400 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1401 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1402};
1403module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1404
1da177e4
LT		 1405/*
1406 * gotoxy() must verify all boundaries, because the arguments
1407 * might also be negative. If the given position is out of
1408 * bounds, the cursor is placed at the nearest margin.
1409 */
1410static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1411{
1412 int min_y, max_y;
1413
1414 if (new_x < 0)
1415 vc->vc_x = 0;
1416 else {
1417 if (new_x >= vc->vc_cols)
1418 vc->vc_x = vc->vc_cols - 1;
1419 else
1420 vc->vc_x = new_x;
1421 }
1422
1423 if (vc->vc_decom) {
1424 min_y = vc->vc_top;
1425 max_y = vc->vc_bottom;
1426 } else {
1427 min_y = 0;
1428 max_y = vc->vc_rows;
1429 }
1430 if (new_y < min_y)
1431 vc->vc_y = min_y;
1432 else if (new_y >= max_y)
1433 vc->vc_y = max_y - 1;
1434 else
1435 vc->vc_y = new_y;
1436 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1437 vc->vc_need_wrap = 0;
1438}
1439
1440/* for absolute user moves, when decom is set */
1441static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1442{
1443 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1444}
1445
1b0ec88a 1446void scrollback(struct vc_data *vc)
1da177e4 1447{
1b0ec88a 1448 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1449}
1450
1451void scrollfront(struct vc_data *vc, int lines)
1452{
1453 if (!lines)
1454 lines = vc->vc_rows / 2;
1455 scrolldelta(lines);
1456}
1457
1458static void lf(struct vc_data *vc)
1459{
1460 /* don't scroll if above bottom of scrolling region, or
1461 * if below scrolling region
1462 */
1463 if (vc->vc_y + 1 == vc->vc_bottom)
89765b94 1464 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1da177e4
LT		 1465 else if (vc->vc_y < vc->vc_rows - 1) {
1466 vc->vc_y++;
1467 vc->vc_pos += vc->vc_size_row;
1468 }
1469 vc->vc_need_wrap = 0;
b293d758 1470 notify_write(vc, '\n');
1da177e4
LT		 1471}
1472
1473static void ri(struct vc_data *vc)
1474{
1475 /* don't scroll if below top of scrolling region, or
1476 * if above scrolling region
1477 */
1478 if (vc->vc_y == vc->vc_top)
89765b94 1479 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1da177e4
LT		 1480 else if (vc->vc_y > 0) {
1481 vc->vc_y--;
1482 vc->vc_pos -= vc->vc_size_row;
1483 }
1484 vc->vc_need_wrap = 0;
1485}
1486
1487static inline void cr(struct vc_data *vc)
1488{
1489 vc->vc_pos -= vc->vc_x << 1;
1490 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1491 notify_write(vc, '\r');
1da177e4
LT		 1492}
1493
1494static inline void bs(struct vc_data *vc)
1495{
1496 if (vc->vc_x) {
1497 vc->vc_pos -= 2;
1498 vc->vc_x--;
1499 vc->vc_need_wrap = 0;
b293d758 1500 notify_write(vc, '\b');
1da177e4
LT		 1501 }
1502}
1503
1504static inline void del(struct vc_data *vc)
1505{
1506 /* ignored */
1507}
1508
1509static void csi_J(struct vc_data *vc, int vpar)
1510{
1511 unsigned int count;
1512 unsigned short * start;
1513
1514 switch (vpar) {
1515 case 0: /* erase from cursor to end of display */
d8ae7242
NP		 1516 vc_uniscr_clear_line(vc, vc->vc_x,
1517 vc->vc_cols - vc->vc_x);
1518 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1519 vc->vc_rows - vc->vc_y - 1);
1da177e4
LT		 1520 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1521 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1522 break;
1523 case 1: /* erase from start to cursor */
d8ae7242
NP		 1524 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1525 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1da177e4
LT		 1526 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1527 start = (unsigned short *)vc->vc_origin;
1da177e4 1528 break;
a6dbe442
NP		 1529 case 3: /* include scrollback */
1530 flush_scrollback(vc);
1531 /* fallthrough */
1da177e4 1532 case 2: /* erase whole display */
d8ae7242 1533 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1534 count = vc->vc_cols * vc->vc_rows;
1535 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1536 break;
1537 default:
1538 return;
1539 }
1540 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
b2ecf006
MP		 1541 if (con_should_update(vc))
1542 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1543 vc->vc_need_wrap = 0;
1544}
1545
1546static void csi_K(struct vc_data *vc, int vpar)
1547{
1548 unsigned int count;
d8ae7242
NP		 1549 unsigned short *start = (unsigned short *)vc->vc_pos;
1550 int offset;
1da177e4
LT		 1551
1552 switch (vpar) {
1553 case 0: /* erase from cursor to end of line */
d8ae7242 1554 offset = 0;
1da177e4 1555 count = vc->vc_cols - vc->vc_x;
1da177e4
LT		 1556 break;
1557 case 1: /* erase from start of line to cursor */
d8ae7242 1558 offset = -vc->vc_x;
1da177e4 1559 count = vc->vc_x + 1;
1da177e4
LT		 1560 break;
1561 case 2: /* erase whole line */
d8ae7242 1562 offset = -vc->vc_x;
1da177e4 1563 count = vc->vc_cols;
1da177e4
LT		 1564 break;
1565 default:
1566 return;
1567 }
d8ae7242
NP		 1568 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1569 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1570 vc->vc_need_wrap = 0;
6ca8dfd7 1571 if (con_should_update(vc))
943210ba 1572 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1573}
1574
1575static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1576{ /* not vt100? */
1577 int count;
1578
1579 if (!vpar)
1580 vpar++;
1581 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1582
d8ae7242 1583 vc_uniscr_clear_line(vc, vc->vc_x, count);
1da177e4 1584 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1585 if (con_should_update(vc))
1da177e4
LT		 1586 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1587 vc->vc_need_wrap = 0;
1588}
1589
1590static void default_attr(struct vc_data *vc)
1591{
1592 vc->vc_intensity = 1;
fa6ce9ab 1593 vc->vc_italic = 0;
1da177e4
LT		 1594 vc->vc_underline = 0;
1595 vc->vc_reverse = 0;
1596 vc->vc_blink = 0;
1597 vc->vc_color = vc->vc_def_color;
1598}
1599
cec5b2a9
AB		 1600struct rgb { u8 r; u8 g; u8 b; };
1601
0f91e142 1602static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1603{
cec5b2a9 1604 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1605 c->r = i&1 ? 0xaa : 0x00;
1606 c->g = i&2 ? 0xaa : 0x00;
1607 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1608 } else if (i < 16) {
0f91e142
JS		 1609 c->r = i&1 ? 0xff : 0x55;
1610 c->g = i&2 ? 0xff : 0x55;
1611 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1612 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1613 c->r = (i - 16) / 36 * 85 / 2;
1614 c->g = (i - 16) / 6 % 6 * 85 / 2;
1615 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1616 } else /* Grayscale ramp. */
0f91e142 1617 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1618}
1619
0f91e142 1620static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1621{
193df022
JS		 1622 u8 hue = 0, max = max3(c->r, c->g, c->b);
1623
1624 if (c->r > max / 2)
1625 hue |= 4;
1626 if (c->g > max / 2)
1627 hue |= 2;
1628 if (c->b > max / 2)
1629 hue |= 1;
1630
1631 if (hue == 7 && max <= 0x55) {
1632 hue = 0;
1633 vc->vc_intensity = 2;
1634 } else if (max > 0xaa)
1635 vc->vc_intensity = 2;
cec5b2a9 1636 else
193df022
JS		 1637 vc->vc_intensity = 1;
1638
cec5b2a9
AB		 1639 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1640}
1641
0f91e142 1642static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1643{
1644 /* For backgrounds, err on the dark side. */
1645 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1646 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1647}
1648
e05ab238
JS		 1649/*
1650 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
04afcd3a
MH		 1651 * and thus need to be detected and ignored by hand. That standard also
1652 * wants : rather than ; as separators but sequences containing : are currently
1653 * completely ignored by the parser.
e05ab238
JS		 1654 *
1655 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1656 * supporting them.
1657 */
1658static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1659 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1660{
0f91e142
JS		 1661 struct rgb c;
1662
e05ab238
JS		 1663 i++;
1664 if (i > vc->vc_npar)
1665 return i;
1666
0bf1f4a8 1667 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1668 /* 256 colours */
e05ab238 1669 i++;
0f91e142 1670 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1671 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1672 /* 24 bit */
0f91e142
JS		 1673 c.r = vc->vc_par[i + 1];
1674 c.g = vc->vc_par[i + 2];
1675 c.b = vc->vc_par[i + 3];
e05ab238 1676 i += 3;
0f91e142
JS		 1677 } else
1678 return i;
1679
1680 set_color(vc, &c);
e05ab238
JS		 1681
1682 return i;
1683}
1684
ac751efa 1685/* console_lock is held */
1da177e4
LT		 1686static void csi_m(struct vc_data *vc)
1687{
1688 int i;
1689
1690 for (i = 0; i <= vc->vc_npar; i++)
1691 switch (vc->vc_par[i]) {
aada0a34
JS		 1692 case 0: /* all attributes off */
1693 default_attr(vc);
1694 break;
1695 case 1:
1696 vc->vc_intensity = 2;
1697 break;
1698 case 2:
1699 vc->vc_intensity = 0;
1700 break;
1701 case 3:
1702 vc->vc_italic = 1;
1703 break;
65d9982d
MF		 1704 case 21:
1705 /*
1706 * No console drivers support double underline, so
1707 * convert it to a single underline.
1708 */
aada0a34
JS		 1709 case 4:
1710 vc->vc_underline = 1;
1711 break;
1712 case 5:
1713 vc->vc_blink = 1;
1714 break;
1715 case 7:
1716 vc->vc_reverse = 1;
1717 break;
1718 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1719 * Select primary font, don't display control chars if
1720 * defined, don't set bit 8 on output.
1721 */
1722 vc->vc_translate = set_translate(vc->vc_charset == 0
1723 ? vc->vc_G0_charset
1724 : vc->vc_G1_charset, vc);
1725 vc->vc_disp_ctrl = 0;
1726 vc->vc_toggle_meta = 0;
1727 break;
1728 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1729 * Select first alternate font, lets chars < 32 be
1730 * displayed as ROM chars.
1731 */
1732 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1733 vc->vc_disp_ctrl = 1;
1734 vc->vc_toggle_meta = 0;
1735 break;
1736 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1737 * Select second alternate font, toggle high bit
1738 * before displaying as ROM char.
1739 */
1740 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1741 vc->vc_disp_ctrl = 1;
1742 vc->vc_toggle_meta = 1;
1743 break;
aada0a34
JS		 1744 case 22:
1745 vc->vc_intensity = 1;
1746 break;
1747 case 23:
1748 vc->vc_italic = 0;
1749 break;
1750 case 24:
1751 vc->vc_underline = 0;
1752 break;
1753 case 25:
1754 vc->vc_blink = 0;
1755 break;
1756 case 27:
1757 vc->vc_reverse = 0;
1758 break;
1759 case 38:
1760 i = vc_t416_color(vc, i, rgb_foreground);
1761 break;
1762 case 48:
1763 i = vc_t416_color(vc, i, rgb_background);
1764 break;
1765 case 39:
1766 vc->vc_color = (vc->vc_def_color & 0x0f) |
1767 (vc->vc_color & 0xf0);
1768 break;
1769 case 49:
1770 vc->vc_color = (vc->vc_def_color & 0xf0) |
1771 (vc->vc_color & 0x0f);
1772 break;
1773 default:
fadb4244
AB		 1774 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1775 if (vc->vc_par[i] < 100)
1776 vc->vc_intensity = 2;
cc67dc28
AB		 1777 vc->vc_par[i] -= 60;
1778 }
aada0a34
JS		 1779 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1780 vc->vc_color = color_table[vc->vc_par[i] - 30]
1781 | (vc->vc_color & 0xf0);
1782 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1783 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1784 | (vc->vc_color & 0x0f);
1785 break;
1da177e4
LT		 1786 }
1787 update_attr(vc);
1788}
1789
6732c8bb 1790static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1791{
1792 while (*p) {
6732c8bb 1793 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1794 p++;
1795 }
6732c8bb 1796 tty_schedule_flip(port);
1da177e4
LT		 1797}
1798
1799static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1800{
1801 char buf[40];
1802
1803 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1804 respond_string(buf, tty->port);
1da177e4
LT		 1805}
1806
1807static inline void status_report(struct tty_struct *tty)
1808{
6732c8bb 1809 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1810}
1811
6732c8bb 1812static inline void respond_ID(struct tty_struct *tty)
1da177e4 1813{
6732c8bb 1814 respond_string(VT102ID, tty->port);
1da177e4
LT		 1815}
1816
1817void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1818{
1819 char buf[8];
1820
1821 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1822 (char)('!' + mry));
6732c8bb 1823 respond_string(buf, tty->port);
1da177e4
LT		 1824}
1825
496124e5 1826/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1da177e4
LT		 1827int mouse_reporting(void)
1828{
1829 return vc_cons[fg_console].d->vc_report_mouse;
1830}
1831
ac751efa 1832/* console_lock is held */
1da177e4
LT		 1833static void set_mode(struct vc_data *vc, int on_off)
1834{
1835 int i;
1836
1837 for (i = 0; i <= vc->vc_npar; i++)
2ff5c5a1 1838 if (vc->vc_priv == EPdec) {
1da177e4
LT		 1839 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1840 case 1: /* Cursor keys send ^[Ox/^[[x */
1841 if (on_off)
1842 set_kbd(vc, decckm);
1843 else
1844 clr_kbd(vc, decckm);
1845 break;
1846 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1847#if 0
1848 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1849 /* this alone does not suffice; some user mode
1850 utility has to change the hardware regs */
1851#endif
1852 break;
1853 case 5: /* Inverted screen on/off */
1854 if (vc->vc_decscnm != on_off) {
1855 vc->vc_decscnm = on_off;
1856 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1857 update_attr(vc);
1858 }
1859 break;
1860 case 6: /* Origin relative/absolute */
1861 vc->vc_decom = on_off;
1862 gotoxay(vc, 0, 0);
1863 break;
1864 case 7: /* Autowrap on/off */
1865 vc->vc_decawm = on_off;
1866 break;
1867 case 8: /* Autorepeat on/off */
1868 if (on_off)
1869 set_kbd(vc, decarm);
1870 else
1871 clr_kbd(vc, decarm);
1872 break;
1873 case 9:
1874 vc->vc_report_mouse = on_off ? 1 : 0;
1875 break;
1876 case 25: /* Cursor on/off */
1877 vc->vc_deccm = on_off;
1878 break;
1879 case 1000:
1880 vc->vc_report_mouse = on_off ? 2 : 0;
1881 break;
1882 }
1883 } else {
1884 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1885 case 3: /* Monitor (display ctrls) */
1886 vc->vc_disp_ctrl = on_off;
1887 break;
1888 case 4: /* Insert Mode on/off */
1889 vc->vc_decim = on_off;
1890 break;
1891 case 20: /* Lf, Enter == CrLf/Lf */
1892 if (on_off)
1893 set_kbd(vc, lnm);
1894 else
1895 clr_kbd(vc, lnm);
1896 break;
1897 }
1898 }
1899}
1900
ac751efa 1901/* console_lock is held */
1da177e4
LT		 1902static void setterm_command(struct vc_data *vc)
1903{
1904 switch(vc->vc_par[0]) {
1905 case 1: /* set color for underline mode */
1906 if (vc->vc_can_do_color &&
1907 vc->vc_par[1] < 16) {
1908 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1909 if (vc->vc_underline)
1910 update_attr(vc);
1911 }
1912 break;
1913 case 2: /* set color for half intensity mode */
1914 if (vc->vc_can_do_color &&
1915 vc->vc_par[1] < 16) {
1916 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1917 if (vc->vc_intensity == 0)
1918 update_attr(vc);
1919 }
1920 break;
1921 case 8: /* store colors as defaults */
1922 vc->vc_def_color = vc->vc_attr;
1923 if (vc->vc_hi_font_mask == 0x100)
1924 vc->vc_def_color >>= 1;
1925 default_attr(vc);
1926 update_attr(vc);
1927 break;
1928 case 9: /* set blanking interval */
f324edc8 1929 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1930 poke_blanked_console();
1931 break;
1932 case 10: /* set bell frequency in Hz */
1933 if (vc->vc_npar >= 1)
1934 vc->vc_bell_pitch = vc->vc_par[1];
1935 else
1936 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1937 break;
1938 case 11: /* set bell duration in msec */
1939 if (vc->vc_npar >= 1)
1940 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1941 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1942 else
1943 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1944 break;
1945 case 12: /* bring specified console to the front */
1946 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1947 set_console(vc->vc_par[1] - 1);
1948 break;
1949 case 13: /* unblank the screen */
1950 poke_blanked_console();
1951 break;
1952 case 14: /* set vesa powerdown interval */
1953 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1954 break;
1955 case 15: /* activate the previous console */
1956 set_console(last_console);
1957 break;
bd63364c
SD		 1958 case 16: /* set cursor blink duration in msec */
1959 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1960 vc->vc_par[1] <= USHRT_MAX)
1961 vc->vc_cur_blink_ms = vc->vc_par[1];
1962 else
1963 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1964 break;
1da177e4
LT		 1965 }
1966}
1967
ac751efa 1968/* console_lock is held */
1da177e4
LT		 1969static void csi_at(struct vc_data *vc, unsigned int nr)
1970{
1971 if (nr > vc->vc_cols - vc->vc_x)
1972 nr = vc->vc_cols - vc->vc_x;
1973 else if (!nr)
1974 nr = 1;
1975 insert_char(vc, nr);
1976}
1977
ac751efa 1978/* console_lock is held */
1da177e4
LT		 1979static void csi_L(struct vc_data *vc, unsigned int nr)
1980{
1981 if (nr > vc->vc_rows - vc->vc_y)
1982 nr = vc->vc_rows - vc->vc_y;
1983 else if (!nr)
1984 nr = 1;
89765b94 1985 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 1986 vc->vc_need_wrap = 0;
1987}
1988
ac751efa 1989/* console_lock is held */
1da177e4
LT		 1990static void csi_P(struct vc_data *vc, unsigned int nr)
1991{
1992 if (nr > vc->vc_cols - vc->vc_x)
1993 nr = vc->vc_cols - vc->vc_x;
1994 else if (!nr)
1995 nr = 1;
1996 delete_char(vc, nr);
1997}
1998
ac751efa 1999/* console_lock is held */
1da177e4
LT		 2000static void csi_M(struct vc_data *vc, unsigned int nr)
2001{
2002 if (nr > vc->vc_rows - vc->vc_y)
2003 nr = vc->vc_rows - vc->vc_y;
2004 else if (!nr)
2005 nr=1;
89765b94 2006 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
1da177e4
LT		 2007 vc->vc_need_wrap = 0;
2008}
2009
ac751efa 2010/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 2011static void save_cur(struct vc_data *vc)
2012{
2013 vc->vc_saved_x = vc->vc_x;
2014 vc->vc_saved_y = vc->vc_y;
2015 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 2016 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 2017 vc->vc_s_underline = vc->vc_underline;
2018 vc->vc_s_blink = vc->vc_blink;
2019 vc->vc_s_reverse = vc->vc_reverse;
2020 vc->vc_s_charset = vc->vc_charset;
2021 vc->vc_s_color = vc->vc_color;
2022 vc->vc_saved_G0 = vc->vc_G0_charset;
2023 vc->vc_saved_G1 = vc->vc_G1_charset;
2024}
2025
ac751efa 2026/* console_lock is held */
1da177e4
LT		 2027static void restore_cur(struct vc_data *vc)
2028{
2029 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2030 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 2031 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 2032 vc->vc_underline = vc->vc_s_underline;
2033 vc->vc_blink = vc->vc_s_blink;
2034 vc->vc_reverse = vc->vc_s_reverse;
2035 vc->vc_charset = vc->vc_s_charset;
2036 vc->vc_color = vc->vc_s_color;
2037 vc->vc_G0_charset = vc->vc_saved_G0;
2038 vc->vc_G1_charset = vc->vc_saved_G1;
2039 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2040 update_attr(vc);
2041 vc->vc_need_wrap = 0;
2042}
2043
b290af68 2044enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
7a99565f 2045 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
63f3a16d 2046 ESpalette, ESosc };
1da177e4 2047
ac751efa 2048/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2049static void reset_terminal(struct vc_data *vc, int do_clear)
2050{
2051 vc->vc_top = 0;
2052 vc->vc_bottom = vc->vc_rows;
2053 vc->vc_state = ESnormal;
2ff5c5a1 2054 vc->vc_priv = EPecma;
1da177e4
LT		 2055 vc->vc_translate = set_translate(LAT1_MAP, vc);
2056 vc->vc_G0_charset = LAT1_MAP;
2057 vc->vc_G1_charset = GRAF_MAP;
2058 vc->vc_charset = 0;
2059 vc->vc_need_wrap = 0;
2060 vc->vc_report_mouse = 0;
042f10ec 2061 vc->vc_utf = default_utf8;
1da177e4
LT		 2062 vc->vc_utf_count = 0;
2063
2064 vc->vc_disp_ctrl = 0;
2065 vc->vc_toggle_meta = 0;
2066
2067 vc->vc_decscnm = 0;
2068 vc->vc_decom = 0;
2069 vc->vc_decawm = 1;
f6c06b68 2070 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2071 vc->vc_decim = 0;
2072
079c9534 2073 vt_reset_keyboard(vc->vc_num);
1da177e4 2074
9ea9a886 2075 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2076 vc->vc_complement_mask = vc->vc_s_complement_mask;
2077
2078 default_attr(vc);
2079 update_attr(vc);
2080
f1869a89 2081 vc->vc_tab_stop[0] =
1da177e4
LT		 2082 vc->vc_tab_stop[1] =
2083 vc->vc_tab_stop[2] =
2084 vc->vc_tab_stop[3] =
a564738c
WK		 2085 vc->vc_tab_stop[4] =
2086 vc->vc_tab_stop[5] =
2087 vc->vc_tab_stop[6] =
2088 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 2089
2090 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2091 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2092 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2093
2094 gotoxy(vc, 0, 0);
2095 save_cur(vc);
2096 if (do_clear)
2097 csi_J(vc, 2);
2098}
2099
ac751efa 2100/* console_lock is held */
1da177e4
LT		 2101static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2102{
2103 /*
2104 * Control characters can be used in the _middle_
2105 * of an escape sequence.
2106 */
63f3a16d
AB		 2107 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2108 return;
1da177e4
LT		 2109 switch (c) {
2110 case 0:
2111 return;
2112 case 7:
63f3a16d
AB		 2113 if (vc->vc_state == ESosc)
2114 vc->vc_state = ESnormal;
2115 else if (vc->vc_bell_duration)
1da177e4
LT		 2116 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2117 return;
2118 case 8:
2119 bs(vc);
2120 return;
2121 case 9:
2122 vc->vc_pos -= (vc->vc_x << 1);
2123 while (vc->vc_x < vc->vc_cols - 1) {
2124 vc->vc_x++;
f1869a89 2125 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1da177e4
LT		 2126 break;
2127 }
2128 vc->vc_pos += (vc->vc_x << 1);
b293d758 2129 notify_write(vc, '\t');
1da177e4
LT		 2130 return;
2131 case 10: case 11: case 12:
2132 lf(vc);
2133 if (!is_kbd(vc, lnm))
2134 return;
17504fd7 2135 /* fall through */
1da177e4
LT		 2136 case 13:
2137 cr(vc);
2138 return;
2139 case 14:
2140 vc->vc_charset = 1;
2141 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2142 vc->vc_disp_ctrl = 1;
2143 return;
2144 case 15:
2145 vc->vc_charset = 0;
2146 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2147 vc->vc_disp_ctrl = 0;
2148 return;
2149 case 24: case 26:
2150 vc->vc_state = ESnormal;
2151 return;
2152 case 27:
2153 vc->vc_state = ESesc;
2154 return;
2155 case 127:
2156 del(vc);
2157 return;
2158 case 128+27:
2159 vc->vc_state = ESsquare;
2160 return;
2161 }
2162 switch(vc->vc_state) {
2163 case ESesc:
2164 vc->vc_state = ESnormal;
2165 switch (c) {
2166 case '[':
2167 vc->vc_state = ESsquare;
2168 return;
2169 case ']':
2170 vc->vc_state = ESnonstd;
2171 return;
2172 case '%':
2173 vc->vc_state = ESpercent;
2174 return;
2175 case 'E':
2176 cr(vc);
2177 lf(vc);
2178 return;
2179 case 'M':
2180 ri(vc);
2181 return;
2182 case 'D':
2183 lf(vc);
2184 return;
2185 case 'H':
f1869a89 2186 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1da177e4
LT		 2187 return;
2188 case 'Z':
2189 respond_ID(tty);
2190 return;
2191 case '7':
2192 save_cur(vc);
2193 return;
2194 case '8':
2195 restore_cur(vc);
2196 return;
2197 case '(':
2198 vc->vc_state = ESsetG0;
2199 return;
2200 case ')':
2201 vc->vc_state = ESsetG1;
2202 return;
2203 case '#':
2204 vc->vc_state = EShash;
2205 return;
2206 case 'c':
2207 reset_terminal(vc, 1);
2208 return;
2209 case '>': /* Numeric keypad */
2210 clr_kbd(vc, kbdapplic);
2211 return;
2212 case '=': /* Appl. keypad */
2213 set_kbd(vc, kbdapplic);
2214 return;
2215 }
2216 return;
2217 case ESnonstd:
2218 if (c=='P') { /* palette escape sequence */
2219 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2220 vc->vc_par[vc->vc_npar] = 0;
2221 vc->vc_npar = 0;
2222 vc->vc_state = ESpalette;
2223 return;
2224 } else if (c=='R') { /* reset palette */
2225 reset_palette(vc);
2226 vc->vc_state = ESnormal;
63f3a16d
AB		 2227 } else if (c>='0' && c<='9')
2228 vc->vc_state = ESosc;
2229 else
1da177e4
LT		 2230 vc->vc_state = ESnormal;
2231 return;
2232 case ESpalette:
74c807ce
AS		 2233 if (isxdigit(c)) {
2234 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2235 if (vc->vc_npar == 7) {
2236 int i = vc->vc_par[0] * 3, j = 1;
2237 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2238 vc->vc_palette[i++] += vc->vc_par[j++];
2239 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2240 vc->vc_palette[i++] += vc->vc_par[j++];
2241 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2242 vc->vc_palette[i] += vc->vc_par[j];
2243 set_palette(vc);
2244 vc->vc_state = ESnormal;
2245 }
2246 } else
2247 vc->vc_state = ESnormal;
2248 return;
2249 case ESsquare:
2250 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2251 vc->vc_par[vc->vc_npar] = 0;
2252 vc->vc_npar = 0;
2253 vc->vc_state = ESgetpars;
2254 if (c == '[') { /* Function key */
2255 vc->vc_state=ESfunckey;
2256 return;
2257 }
5445447b
MH		 2258 switch (c) {
2259 case '?':
2260 vc->vc_priv = EPdec;
2261 return;
2262 case '>':
2263 vc->vc_priv = EPgt;
2264 return;
2265 case '=':
2266 vc->vc_priv = EPeq;
1da177e4 2267 return;
5445447b
MH		 2268 case '<':
2269 vc->vc_priv = EPlt;
2270 return;
2271 }
2272 vc->vc_priv = EPecma;
17504fd7 2273 /* fall through */
1da177e4
LT		 2274 case ESgetpars:
2275 if (c == ';' && vc->vc_npar < NPAR - 1) {
2276 vc->vc_npar++;
2277 return;
2278 } else if (c>='0' && c<='9') {
2279 vc->vc_par[vc->vc_npar] *= 10;
2280 vc->vc_par[vc->vc_npar] += c - '0';
2281 return;
b290af68 2282 }
04afcd3a 2283 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
7a99565f
MH		 2284 vc->vc_state = EScsiignore;
2285 return;
2286 }
1da177e4
LT		 2287 vc->vc_state = ESnormal;
2288 switch(c) {
2289 case 'h':
5445447b
MH		 2290 if (vc->vc_priv <= EPdec)
2291 set_mode(vc, 1);
1da177e4
LT		 2292 return;
2293 case 'l':
5445447b
MH		 2294 if (vc->vc_priv <= EPdec)
2295 set_mode(vc, 0);
1da177e4
LT		 2296 return;
2297 case 'c':
2ff5c5a1 2298 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2299 if (vc->vc_par[0])
2300 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2301 else
9ea9a886 2302 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2303 return;
2304 }
2305 break;
2306 case 'm':
2ff5c5a1 2307 if (vc->vc_priv == EPdec) {
1da177e4
LT		 2308 clear_selection();
2309 if (vc->vc_par[0])
2310 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2311 else
2312 vc->vc_complement_mask = vc->vc_s_complement_mask;
2313 return;
2314 }
2315 break;
2316 case 'n':
2ff5c5a1 2317 if (vc->vc_priv == EPecma) {
1da177e4
LT		 2318 if (vc->vc_par[0] == 5)
2319 status_report(tty);
2320 else if (vc->vc_par[0] == 6)
2321 cursor_report(vc, tty);
2322 }
2323 return;
2324 }
2ff5c5a1
MH		 2325 if (vc->vc_priv != EPecma) {
2326 vc->vc_priv = EPecma;
1da177e4
LT		 2327 return;
2328 }
2329 switch(c) {
2330 case 'G': case '`':
2331 if (vc->vc_par[0])
2332 vc->vc_par[0]--;
2333 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2334 return;
2335 case 'A':
2336 if (!vc->vc_par[0])
2337 vc->vc_par[0]++;
2338 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2339 return;
2340 case 'B': case 'e':
2341 if (!vc->vc_par[0])
2342 vc->vc_par[0]++;
2343 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2344 return;
2345 case 'C': case 'a':
2346 if (!vc->vc_par[0])
2347 vc->vc_par[0]++;
2348 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2349 return;
2350 case 'D':
2351 if (!vc->vc_par[0])
2352 vc->vc_par[0]++;
2353 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2354 return;
2355 case 'E':
2356 if (!vc->vc_par[0])
2357 vc->vc_par[0]++;
2358 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2359 return;
2360 case 'F':
2361 if (!vc->vc_par[0])
2362 vc->vc_par[0]++;
2363 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2364 return;
2365 case 'd':
2366 if (vc->vc_par[0])
2367 vc->vc_par[0]--;
2368 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2369 return;
2370 case 'H': case 'f':
2371 if (vc->vc_par[0])
2372 vc->vc_par[0]--;
2373 if (vc->vc_par[1])
2374 vc->vc_par[1]--;
2375 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2376 return;
2377 case 'J':
2378 csi_J(vc, vc->vc_par[0]);
2379 return;
2380 case 'K':
2381 csi_K(vc, vc->vc_par[0]);
2382 return;
2383 case 'L':
2384 csi_L(vc, vc->vc_par[0]);
2385 return;
2386 case 'M':
2387 csi_M(vc, vc->vc_par[0]);
2388 return;
2389 case 'P':
2390 csi_P(vc, vc->vc_par[0]);
2391 return;
2392 case 'c':
2393 if (!vc->vc_par[0])
2394 respond_ID(tty);
2395 return;
2396 case 'g':
2397 if (!vc->vc_par[0])
f1869a89 2398 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
1da177e4
LT		 2399 else if (vc->vc_par[0] == 3) {
2400 vc->vc_tab_stop[0] =
2401 vc->vc_tab_stop[1] =
2402 vc->vc_tab_stop[2] =
2403 vc->vc_tab_stop[3] =
a564738c
WK		 2404 vc->vc_tab_stop[4] =
2405 vc->vc_tab_stop[5] =
2406 vc->vc_tab_stop[6] =
2407 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2408 }
2409 return;
2410 case 'm':
2411 csi_m(vc);
2412 return;
2413 case 'q': /* DECLL - but only 3 leds */
2414 /* map 0,1,2,3 to 0,1,2,4 */
2415 if (vc->vc_par[0] < 4)
079c9534 2416 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2417 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2418 return;
2419 case 'r':
2420 if (!vc->vc_par[0])
2421 vc->vc_par[0]++;
2422 if (!vc->vc_par[1])
2423 vc->vc_par[1] = vc->vc_rows;
2424 /* Minimum allowed region is 2 lines */
2425 if (vc->vc_par[0] < vc->vc_par[1] &&
2426 vc->vc_par[1] <= vc->vc_rows) {
2427 vc->vc_top = vc->vc_par[0] - 1;
2428 vc->vc_bottom = vc->vc_par[1];
2429 gotoxay(vc, 0, 0);
2430 }
2431 return;
2432 case 's':
2433 save_cur(vc);
2434 return;
2435 case 'u':
2436 restore_cur(vc);
2437 return;
2438 case 'X':
2439 csi_X(vc, vc->vc_par[0]);
2440 return;
2441 case '@':
2442 csi_at(vc, vc->vc_par[0]);
2443 return;
2444 case ']': /* setterm functions */
2445 setterm_command(vc);
2446 return;
2447 }
2448 return;
7a99565f
MH		 2449 case EScsiignore:
2450 if (c >= 20 && c <= 0x3f)
2451 return;
2452 vc->vc_state = ESnormal;
2453 return;
1da177e4
LT		 2454 case ESpercent:
2455 vc->vc_state = ESnormal;
2456 switch (c) {
2457 case '@': /* defined in ISO 2022 */
2458 vc->vc_utf = 0;
2459 return;
2460 case 'G': /* prelim official escape code */
2461 case '8': /* retained for compatibility */
2462 vc->vc_utf = 1;
2463 return;
2464 }
2465 return;
2466 case ESfunckey:
2467 vc->vc_state = ESnormal;
2468 return;
2469 case EShash:
2470 vc->vc_state = ESnormal;
2471 if (c == '8') {
2472 /* DEC screen alignment test. kludge :-) */
2473 vc->vc_video_erase_char =
2474 (vc->vc_video_erase_char & 0xff00) | 'E';
2475 csi_J(vc, 2);
2476 vc->vc_video_erase_char =
2477 (vc->vc_video_erase_char & 0xff00) | ' ';
2478 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2479 }
2480 return;
2481 case ESsetG0:
2482 if (c == '0')
2483 vc->vc_G0_charset = GRAF_MAP;
2484 else if (c == 'B')
2485 vc->vc_G0_charset = LAT1_MAP;
2486 else if (c == 'U')
2487 vc->vc_G0_charset = IBMPC_MAP;
2488 else if (c == 'K')
2489 vc->vc_G0_charset = USER_MAP;
2490 if (vc->vc_charset == 0)
2491 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2492 vc->vc_state = ESnormal;
2493 return;
2494 case ESsetG1:
2495 if (c == '0')
2496 vc->vc_G1_charset = GRAF_MAP;
2497 else if (c == 'B')
2498 vc->vc_G1_charset = LAT1_MAP;
2499 else if (c == 'U')
2500 vc->vc_G1_charset = IBMPC_MAP;
2501 else if (c == 'K')
2502 vc->vc_G1_charset = USER_MAP;
2503 if (vc->vc_charset == 1)
2504 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2505 vc->vc_state = ESnormal;
2506 return;
63f3a16d
AB		 2507 case ESosc:
2508 return;
1da177e4
LT		 2509 default:
2510 vc->vc_state = ESnormal;
2511 }
2512}
2513
2f1a2ccb 2514/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2515 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2516 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2517 */
2518struct interval {
2519 uint32_t first;
2520 uint32_t last;
2521};
2522
f0a8d84f 2523static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2524{
f0a8d84f
TM		 2525 uint32_t ucs = *(uint32_t *)key;
2526 struct interval e = *(struct interval *) elt;
2f1a2ccb 2527
f0a8d84f
TM		 2528 if (ucs > e.last)
2529 return 1;
2530 else if (ucs < e.first)
2531 return -1;
2f1a2ccb
EK		 2532 return 0;
2533}
2534
2535static int is_double_width(uint32_t ucs)
2536{
2537 static const struct interval double_width[] = {
2538 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2539 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2540 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2541 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2542 };
f0a8d84f
TM		 2543 if (ucs < double_width[0].first ||
2544 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2545 return 0;
2546
2547 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2548 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2549}
2550
d711ea8f
JS		 2551static void con_flush(struct vc_data *vc, unsigned long draw_from,
2552 unsigned long draw_to, int *draw_x)
2553{
2554 if (*draw_x < 0)
2555 return;
2556
2557 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2558 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2559 *draw_x = -1;
2560}
2561
ac751efa 2562/* acquires console_lock */
1da177e4
LT		 2563static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2564{
d8ae7242 2565 int c, next_c, tc, ok, n = 0, draw_x = -1;
1da177e4
LT		 2566 unsigned int currcons;
2567 unsigned long draw_from = 0, draw_to = 0;
2568 struct vc_data *vc;
2f1a2ccb 2569 unsigned char vc_attr;
0341a4d0 2570 struct vt_notifier_param param;
2f1a2ccb
EK		 2571 uint8_t rescan;
2572 uint8_t inverse;
2573 uint8_t width;
1da177e4 2574 u16 himask, charmask;
1da177e4
LT		 2575
2576 if (in_interrupt())
2577 return count;
2578
2579 might_sleep();
2580
ac751efa 2581 console_lock();
1da177e4
LT		 2582 vc = tty->driver_data;
2583 if (vc == NULL) {
bccf1da3 2584 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2585 console_unlock();
1da177e4
LT		 2586 return 0;
2587 }
2588
2589 currcons = vc->vc_num;
2590 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2591 /* could this happen? */
2592 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2593 console_unlock();
2594 return 0;
1da177e4 2595 }
1da177e4 2596
1da177e4
LT		 2597 himask = vc->vc_hi_font_mask;
2598 charmask = himask ? 0x1ff : 0xff;
2599
2600 /* undraw cursor first */
6ca8dfd7 2601 if (con_is_fg(vc))
1da177e4
LT		 2602 hide_cursor(vc);
2603
0341a4d0
KD		 2604 param.vc = vc;
2605
1da177e4
LT		 2606 while (!tty->stopped && count) {
2607 int orig = *buf;
2608 c = orig;
2609 buf++;
2610 n++;
2611 count--;
2f1a2ccb
EK		 2612 rescan = 0;
2613 inverse = 0;
2614 width = 1;
1da177e4
LT		 2615
2616 /* Do no translation at all in control states */
2617 if (vc->vc_state != ESnormal) {
2618 tc = c;
d4328b40 2619 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2620 /* Combine UTF-8 into Unicode in vc_utf_char.
2621 * vc_utf_count is the number of continuation bytes still
2622 * expected to arrive.
2623 * vc_npar is the number of continuation bytes arrived so
2624 * far
2625 */
d4328b40 2626rescan_last_byte:
2f1a2ccb
EK		 2627 if ((c & 0xc0) == 0x80) {
2628 /* Continuation byte received */
2629 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2630 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2631 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2632 vc->vc_npar++;
2633 if (--vc->vc_utf_count) {
2634 /* Still need some bytes */
1da177e4 2635 continue;
2f1a2ccb
EK		 2636 }
2637 /* Got a whole character */
2638 c = vc->vc_utf_char;
2639 /* Reject overlong sequences */
2640 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2641 c > utf8_length_changes[vc->vc_npar])
2642 c = 0xfffd;
2643 } else {
2644 /* Unexpected continuation byte */
2645 vc->vc_utf_count = 0;
2646 c = 0xfffd;
2647 }
1da177e4 2648 } else {
2f1a2ccb
EK		 2649 /* Single ASCII byte or first byte of a sequence received */
2650 if (vc->vc_utf_count) {
2651 /* Continuation byte expected */
2652 rescan = 1;
2653 vc->vc_utf_count = 0;
2654 c = 0xfffd;
2655 } else if (c > 0x7f) {
2656 /* First byte of a multibyte sequence received */
2657 vc->vc_npar = 0;
2658 if ((c & 0xe0) == 0xc0) {
2659 vc->vc_utf_count = 1;
2660 vc->vc_utf_char = (c & 0x1f);
2661 } else if ((c & 0xf0) == 0xe0) {
2662 vc->vc_utf_count = 2;
2663 vc->vc_utf_char = (c & 0x0f);
2664 } else if ((c & 0xf8) == 0xf0) {
2665 vc->vc_utf_count = 3;
2666 vc->vc_utf_char = (c & 0x07);
2667 } else if ((c & 0xfc) == 0xf8) {
2668 vc->vc_utf_count = 4;
2669 vc->vc_utf_char = (c & 0x03);
2670 } else if ((c & 0xfe) == 0xfc) {
2671 vc->vc_utf_count = 5;
2672 vc->vc_utf_char = (c & 0x01);
2673 } else {
2674 /* 254 and 255 are invalid */
2675 c = 0xfffd;
2676 }
2677 if (vc->vc_utf_count) {
2678 /* Still need some bytes */
2679 continue;
2680 }
2681 }
2682 /* Nothing to do if an ASCII byte was received */
1da177e4 2683 }
2f1a2ccb
EK		 2684 /* End of UTF-8 decoding. */
2685 /* c is the received character, or U+FFFD for invalid sequences. */
2686 /* Replace invalid Unicode code points with U+FFFD too */
2687 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2688 c = 0xfffd;
2689 tc = c;
d4328b40 2690 } else { /* no utf or alternate charset mode */
a29ccf6f 2691 tc = vc_translate(vc, c);
1da177e4
LT		 2692 }
2693
0341a4d0
KD		 2694 param.c = tc;
2695 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2696 &param) == NOTIFY_STOP)
2697 continue;
2698
1da177e4
LT		 2699 /* If the original code was a control character we
2700 * only allow a glyph to be displayed if the code is
2701 * not normally used (such as for cursor movement) or
2702 * if the disp_ctrl mode has been explicitly enabled.
2703 * Certain characters (as given by the CTRL_ALWAYS
2704 * bitmap) are always displayed as control characters,
2705 * as the console would be pretty useless without
2706 * them; to display an arbitrary font position use the
2707 * direct-to-font zone in UTF-8 mode.
2708 */
2709 ok = tc && (c >= 32 ||
d4328b40
AT		 2710 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2711 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2712 && (c != 127 || vc->vc_disp_ctrl)
2713 && (c != 128+27);
2714
2715 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2716 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2717 if (is_double_width(c))
2718 width = 2;
2719 }
1da177e4
LT		 2720 /* Now try to find out how to display it */
2721 tc = conv_uni_to_pc(vc, tc);
d4328b40 2722 if (tc & ~charmask) {
2f1a2ccb
EK		 2723 if (tc == -1 || tc == -2) {
2724 continue; /* nothing to display */
2725 }
2726 /* Glyph not found */
c0b79882 2727 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2728 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2729 This would make absolutely no sense with Unicode in mind,
2730 but do this for ASCII characters since a font may lack
2731 Unicode mapping info and we don't want to end up with
2732 having question marks only. */
2f1a2ccb
EK		 2733 tc = c;
2734 } else {
2735 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2736 tc = conv_uni_to_pc(vc, 0xfffd);
2737 if (tc < 0) {
2738 inverse = 1;
2739 tc = conv_uni_to_pc(vc, '?');
2740 if (tc < 0) tc = '?';
2741 }
2742 }
d4328b40 2743 }
1da177e4 2744
2f1a2ccb
EK		 2745 if (!inverse) {
2746 vc_attr = vc->vc_attr;
1da177e4 2747 } else {
2f1a2ccb
EK		 2748 /* invert vc_attr */
2749 if (!vc->vc_can_do_color) {
2750 vc_attr = (vc->vc_attr) ^ 0x08;
2751 } else if (vc->vc_hi_font_mask == 0x100) {
2752 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2753 } else {
2754 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2755 }
d711ea8f 2756 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2757 }
2f1a2ccb 2758
d8ae7242 2759 next_c = c;
2f1a2ccb
EK		 2760 while (1) {
2761 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2762 con_flush(vc, draw_from, draw_to,
2763 &draw_x);
2f1a2ccb
EK		 2764 if (vc->vc_need_wrap) {
2765 cr(vc);
2766 lf(vc);
2767 }
2768 if (vc->vc_decim)
2769 insert_char(vc, 1);
d8ae7242 2770 vc_uniscr_putc(vc, next_c);
2f1a2ccb
EK		 2771 scr_writew(himask ?
2772 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2773 (vc_attr << 8) + tc,
2774 (u16 *) vc->vc_pos);
6ca8dfd7 2775 if (con_should_update(vc) && draw_x < 0) {
2f1a2ccb
EK		 2776 draw_x = vc->vc_x;
2777 draw_from = vc->vc_pos;
2778 }
2779 if (vc->vc_x == vc->vc_cols - 1) {
2780 vc->vc_need_wrap = vc->vc_decawm;
2781 draw_to = vc->vc_pos + 2;
2782 } else {
2783 vc->vc_x++;
2784 draw_to = (vc->vc_pos += 2);
d4328b40 2785 }
2f1a2ccb
EK		 2786
2787 if (!--width) break;
2788
2789 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2790 if (tc < 0) tc = ' ';
d8ae7242 2791 next_c = ' ';
2f1a2ccb 2792 }
b293d758 2793 notify_write(vc, c);
2f1a2ccb 2794
d711ea8f
JS		 2795 if (inverse)
2796 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2797
2f1a2ccb
EK		 2798 if (rescan) {
2799 rescan = 0;
2800 inverse = 0;
2801 width = 1;
d4328b40
AT		 2802 c = orig;
2803 goto rescan_last_byte;
2804 }
1da177e4
LT		 2805 continue;
2806 }
d711ea8f 2807 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2808 do_con_trol(tty, vc, orig);
2809 }
d711ea8f 2810 con_flush(vc, draw_from, draw_to, &draw_x);
0224080f 2811 vc_uniscr_debug_check(vc);
1da177e4 2812 console_conditional_schedule();
b293d758 2813 notify_update(vc);
7e1d2263 2814 console_unlock();
1da177e4 2815 return n;
1da177e4
LT		 2816}
2817
2818/*
2819 * This is the console switching callback.
2820 *
2821 * Doing console switching in a process context allows
2822 * us to do the switches asynchronously (needed when we want
2823 * to switch due to a keyboard interrupt). Synchronization
2824 * with other console code and prevention of re-entrancy is
ac751efa 2825 * ensured with console_lock.
1da177e4 2826 */
65f27f38 2827static void console_callback(struct work_struct *ignored)
1da177e4 2828{
ac751efa 2829 console_lock();
1da177e4
LT		 2830
2831 if (want_console >= 0) {
2832 if (want_console != fg_console &&
2833 vc_cons_allocated(want_console)) {
2834 hide_cursor(vc_cons[fg_console].d);
2835 change_console(vc_cons[want_console].d);
2836 /* we only changed when the console had already
2837 been allocated - a new console is not created
2838 in an interrupt routine */
2839 }
2840 want_console = -1;
2841 }
2842 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2843 do_poke_blanked_console = 0;
2844 poke_blanked_console();
2845 }
2846 if (scrollback_delta) {
2847 struct vc_data *vc = vc_cons[fg_console].d;
2848 clear_selection();
97293de9 2849 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2850 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2851 scrollback_delta = 0;
2852 }
2853 if (blank_timer_expired) {
2854 do_blank_screen(0);
2855 blank_timer_expired = 0;
2856 }
b293d758 2857 notify_update(vc_cons[fg_console].d);
1da177e4 2858
ac751efa 2859 console_unlock();
1da177e4
LT		 2860}
2861
b257bc05 2862int set_console(int nr)
1da177e4 2863{
b257bc05
AJ		 2864 struct vc_data *vc = vc_cons[fg_console].d;
2865
2866 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2867 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2868
2869 /*
2870 * Console switch will fail in console_callback() or
2871 * change_console() so there is no point scheduling
2872 * the callback
2873 *
2874 * Existing set_console() users don't check the return
2875 * value so this shouldn't break anything
2876 */
2877 return -EINVAL;
2878 }
2879
1da177e4
LT		 2880 want_console = nr;
2881 schedule_console_callback();
b257bc05
AJ		 2882
2883 return 0;
1da177e4
LT		 2884}
2885
2886struct tty_driver *console_driver;
2887
2888#ifdef CONFIG_VT_CONSOLE
2889
5ada918b
BW		 2890/**
2891 * vt_kmsg_redirect() - Sets/gets the kernel message console
2892 * @new: The new virtual terminal number or -1 if the console should stay
2893 * unchanged
2894 *
2895 * By default, the kernel messages are always printed on the current virtual
2896 * console. However, the user may modify that default with the
2897 * TIOCL_SETKMSGREDIRECT ioctl call.
2898 *
2899 * This function sets the kernel message console to be @new. It returns the old
2900 * virtual console number. The virtual terminal number 0 (both as parameter and
2901 * return value) means no redirection (i.e. always printed on the currently
2902 * active console).
2903 *
2904 * The parameter -1 means that only the current console is returned, but the
2905 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2906 * case to make the code more understandable.
2907 *
2908 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2909 * the parameter and always returns 0.
2910 */
2911int vt_kmsg_redirect(int new)
2912{
2913 static int kmsg_con;
2914
2915 if (new != -1)
2916 return xchg(&kmsg_con, new);
2917 else
2918 return kmsg_con;
2919}
2920
1da177e4
LT		 2921/*
2922 * Console on virtual terminal
2923 *
2924 * The console must be locked when we get here.
2925 */
2926
2927static void vt_console_print(struct console *co, const char *b, unsigned count)
2928{
2929 struct vc_data *vc = vc_cons[fg_console].d;
2930 unsigned char c;
b0940003 2931 static DEFINE_SPINLOCK(printing_lock);
1da177e4 2932 const ushort *start;
6609cff6 2933 ushort start_x, cnt;
5ada918b 2934 int kmsg_console;
1da177e4
LT		 2935
2936 /* console busy or not yet initialized */
b0940003
NP		 2937 if (!printable)
2938 return;
2939 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2940 return;
2941
5ada918b
BW		 2942 kmsg_console = vt_get_kmsg_redirect();
2943 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2944 vc = vc_cons[kmsg_console - 1].d;
1da177e4 2945
1da177e4
LT		 2946 if (!vc_cons_allocated(fg_console)) {
2947 /* impossible */
2948 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2949 goto quit;
2950 }
2951
8d7fc299 2952 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 2953 goto quit;
2954
2955 /* undraw cursor first */
6ca8dfd7 2956 if (con_is_fg(vc))
1da177e4
LT		 2957 hide_cursor(vc);
2958
2959 start = (ushort *)vc->vc_pos;
6609cff6
NP		 2960 start_x = vc->vc_x;
2961 cnt = 0;
1da177e4
LT		 2962 while (count--) {
2963 c = *b++;
2964 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
6609cff6
NP		 2965 if (cnt && con_is_visible(vc))
2966 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2967 cnt = 0;
1da177e4
LT		 2968 if (c == 8) { /* backspace */
2969 bs(vc);
2970 start = (ushort *)vc->vc_pos;
6609cff6 2971 start_x = vc->vc_x;
1da177e4
LT		 2972 continue;
2973 }
2974 if (c != 13)
2975 lf(vc);
2976 cr(vc);
2977 start = (ushort *)vc->vc_pos;
6609cff6 2978 start_x = vc->vc_x;
1da177e4
LT		 2979 if (c == 10 || c == 13)
2980 continue;
2981 }
6609cff6 2982 vc_uniscr_putc(vc, c);
1da177e4 2983 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2984 notify_write(vc, c);
1da177e4 2985 cnt++;
6609cff6 2986 if (vc->vc_x == vc->vc_cols - 1) {
1da177e4 2987 vc->vc_need_wrap = 1;
6609cff6
NP		 2988 } else {
2989 vc->vc_pos += 2;
2990 vc->vc_x++;
1da177e4
LT		 2991 }
2992 }
6609cff6
NP		 2993 if (cnt && con_is_visible(vc))
2994 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
1da177e4 2995 set_cursor(vc);
b293d758 2996 notify_update(vc);
1da177e4
LT		 2997
2998quit:
b0940003 2999 spin_unlock(&printing_lock);
1da177e4
LT		 3000}
3001
3002static struct tty_driver *vt_console_device(struct console *c, int *index)
3003{
3004 *index = c->index ? c->index-1 : fg_console;
3005 return console_driver;
3006}
3007
3008static struct console vt_console_driver = {
3009 .name = "tty",
3010 .write = vt_console_print,
3011 .device = vt_console_device,
3012 .unblank = unblank_screen,
3013 .flags = CON_PRINTBUFFER,
3014 .index = -1,
3015};
3016#endif
3017
3018/*
3019 * Handling of Linux-specific VC ioctls
3020 */
3021
3022/*
ac751efa 3023 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 3024 *
3025 * There are some functions which don't need it.
3026 *
3027 * There are some functions which can sleep for arbitrary periods
3028 * (paste_selection) but we don't need the lock there anyway.
3029 *
496124e5 3030 * set_selection_user has locking, and definitely needs it
1da177e4
LT		 3031 */
3032
3033int tioclinux(struct tty_struct *tty, unsigned long arg)
3034{
3035 char type, data;
3036 char __user *p = (char __user *)arg;
3037 int lines;
3038 int ret;
3039
1da177e4
LT		 3040 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3041 return -EPERM;
3042 if (get_user(type, p))
3043 return -EFAULT;
3044 ret = 0;
04f378b1 3045
1da177e4
LT		 3046 switch (type)
3047 {
3048 case TIOCL_SETSEL:
496124e5
OK		 3049 ret = set_selection_user((struct tiocl_selection
3050 __user *)(p+1), tty);
1da177e4
LT		 3051 break;
3052 case TIOCL_PASTESEL:
3053 ret = paste_selection(tty);
3054 break;
3055 case TIOCL_UNBLANKSCREEN:
ac751efa 3056 console_lock();
1da177e4 3057 unblank_screen();
ac751efa 3058 console_unlock();
1da177e4
LT		 3059 break;
3060 case TIOCL_SELLOADLUT:
5289475d 3061 console_lock();
1da177e4 3062 ret = sel_loadlut(p);
5289475d 3063 console_unlock();
1da177e4
LT		 3064 break;
3065 case TIOCL_GETSHIFTSTATE:
04f378b1 3066
1da177e4
LT		 3067 /*
3068 * Make it possible to react to Shift+Mousebutton.
3069 * Note that 'shift_state' is an undocumented
3070 * kernel-internal variable; programs not closely
3071 * related to the kernel should not use this.
3072 */
079c9534 3073 data = vt_get_shift_state();
6987dc8a 3074 ret = put_user(data, p);
1da177e4
LT		 3075 break;
3076 case TIOCL_GETMOUSEREPORTING:
20f62579 3077 console_lock(); /* May be overkill */
1da177e4 3078 data = mouse_reporting();
20f62579 3079 console_unlock();
6987dc8a 3080 ret = put_user(data, p);
1da177e4
LT		 3081 break;
3082 case TIOCL_SETVESABLANK:
20f62579 3083 console_lock();
403aac96 3084 ret = set_vesa_blanking(p);
20f62579 3085 console_unlock();
1da177e4 3086 break;
0ca07731 3087 case TIOCL_GETKMSGREDIRECT:
5ada918b 3088 data = vt_get_kmsg_redirect();
6987dc8a 3089 ret = put_user(data, p);
0ca07731 3090 break;
1da177e4
LT		 3091 case TIOCL_SETKMSGREDIRECT:
3092 if (!capable(CAP_SYS_ADMIN)) {
3093 ret = -EPERM;
3094 } else {
3095 if (get_user(data, p+1))
3096 ret = -EFAULT;
3097 else
5ada918b 3098 vt_kmsg_redirect(data);
1da177e4
LT		 3099 }
3100 break;
3101 case TIOCL_GETFGCONSOLE:
20f62579
AC		 3102 /* No locking needed as this is a transiently
3103 correct return anyway if the caller hasn't
3104 disabled switching */
1da177e4
LT		 3105 ret = fg_console;
3106 break;
3107 case TIOCL_SCROLLCONSOLE:
3108 if (get_user(lines, (s32 __user *)(p+4))) {
3109 ret = -EFAULT;
3110 } else {
20f62579
AC		 3111 /* Need the console lock here. Note that lots
3112 of other calls need fixing before the lock
3113 is actually useful ! */
3114 console_lock();
1da177e4 3115 scrollfront(vc_cons[fg_console].d, lines);
20f62579 3116 console_unlock();
1da177e4
LT		 3117 ret = 0;
3118 }
3119 break;
3120 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 3121 console_lock();
1da177e4
LT		 3122 ignore_poke = 1;
3123 do_blank_screen(0);
ac751efa 3124 console_unlock();
1da177e4
LT		 3125 break;
3126 case TIOCL_BLANKEDSCREEN:
3127 ret = console_blanked;
3128 break;
3129 default:
3130 ret = -EINVAL;
3131 break;
3132 }
3133 return ret;
3134}
3135
3136/*
3137 * /dev/ttyN handling
3138 */
3139
3140static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3141{
3142 int retval;
3143
3144 retval = do_con_write(tty, buf, count);
3145 con_flush_chars(tty);
3146
3147 return retval;
3148}
3149
5d19f546 3150static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 3151{
3152 if (in_interrupt())
5d19f546
AC		 3153 return 0; /* n_r3964 calls put_char() from interrupt context */
3154 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3155}
3156
3157static int con_write_room(struct tty_struct *tty)
3158{
3159 if (tty->stopped)
3160 return 0;
a88a69c9 3161 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3162}
3163
3164static int con_chars_in_buffer(struct tty_struct *tty)
3165{
3166 return 0; /* we're not buffering */
3167}
3168
3169/*
3170 * con_throttle and con_unthrottle are only used for
3171 * paste_selection(), which has to stuff in a large number of
3172 * characters...
3173 */
3174static void con_throttle(struct tty_struct *tty)
3175{
3176}
3177
3178static void con_unthrottle(struct tty_struct *tty)
3179{
3180 struct vc_data *vc = tty->driver_data;
3181
3182 wake_up_interruptible(&vc->paste_wait);
3183}
3184
3185/*
3186 * Turn the Scroll-Lock LED on when the tty is stopped
3187 */
3188static void con_stop(struct tty_struct *tty)
3189{
3190 int console_num;
3191 if (!tty)
3192 return;
3193 console_num = tty->index;
3194 if (!vc_cons_allocated(console_num))
3195 return;
079c9534 3196 vt_kbd_con_stop(console_num);
1da177e4
LT		 3197}
3198
3199/*
3200 * Turn the Scroll-Lock LED off when the console is started
3201 */
3202static void con_start(struct tty_struct *tty)
3203{
3204 int console_num;
3205 if (!tty)
3206 return;
3207 console_num = tty->index;
3208 if (!vc_cons_allocated(console_num))
3209 return;
079c9534 3210 vt_kbd_con_start(console_num);
1da177e4
LT		 3211}
3212
3213static void con_flush_chars(struct tty_struct *tty)
3214{
3215 struct vc_data *vc;
3216
3217 if (in_interrupt()) /* from flush_to_ldisc */
3218 return;
3219
3220 /* if we race with con_close(), vt may be null */
ac751efa 3221 console_lock();
1da177e4
LT		 3222 vc = tty->driver_data;
3223 if (vc)
3224 set_cursor(vc);
ac751efa 3225 console_unlock();
1da177e4
LT		 3226}
3227
3228/*
3229 * Allocate the console screen memory.
3230 */
bc1e99d9 3231static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3232{
3233 unsigned int currcons = tty->index;
bc1e99d9
JS		 3234 struct vc_data *vc;
3235 int ret;
1da177e4 3236
ac751efa 3237 console_lock();
bc1e99d9
JS		 3238 ret = vc_allocate(currcons);
3239 if (ret)
3240 goto unlock;
feebed65 3241
bc1e99d9 3242 vc = vc_cons[currcons].d;
1da177e4 3243
bc1e99d9
JS		 3244 /* Still being freed */
3245 if (vc->port.tty) {
3246 ret = -ERESTARTSYS;
3247 goto unlock;
3248 }
3249
3250 ret = tty_port_install(&vc->port, driver, tty);
3251 if (ret)
3252 goto unlock;
3253
3254 tty->driver_data = vc;
3255 vc->port.tty = tty;
3256
3257 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3258 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3259 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3260 }
bc1e99d9 3261 if (vc->vc_utf)
adc8d746 3262 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3263 else
adc8d746 3264 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3265unlock:
ac751efa 3266 console_unlock();
1da177e4
LT		 3267 return ret;
3268}
3269
bc1e99d9
JS		 3270static int con_open(struct tty_struct *tty, struct file *filp)
3271{
3272 /* everything done in install */
3273 return 0;
3274}
3275
3276
1da177e4
LT		 3277static void con_close(struct tty_struct *tty, struct file *filp)
3278{
feebed65
AC		 3279 /* Nothing to do - we defer to shutdown */
3280}
1da177e4 3281
feebed65
AC		 3282static void con_shutdown(struct tty_struct *tty)
3283{
3284 struct vc_data *vc = tty->driver_data;
3285 BUG_ON(vc == NULL);
ac751efa 3286 console_lock();
8ce73264 3287 vc->port.tty = NULL;
ac751efa 3288 console_unlock();
1da177e4
LT		 3289}
3290
3855ae1c 3291static int default_color = 7; /* white */
fa6ce9ab
JE		 3292static int default_italic_color = 2; // green (ASCII)
3293static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3294module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3295module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3296module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3297
1da177e4
LT		 3298static void vc_init(struct vc_data *vc, unsigned int rows,
3299 unsigned int cols, int do_clear)
3300{
3301 int j, k ;
3302
3303 vc->vc_cols = cols;
3304 vc->vc_rows = rows;
3305 vc->vc_size_row = cols << 1;
3306 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3307
3308 set_origin(vc);
3309 vc->vc_pos = vc->vc_origin;
3310 reset_vc(vc);
3311 for (j=k=0; j<16; j++) {
3312 vc->vc_palette[k++] = default_red[j] ;
3313 vc->vc_palette[k++] = default_grn[j] ;
3314 vc->vc_palette[k++] = default_blu[j] ;
3315 }
3855ae1c 3316 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3317 vc->vc_ulcolor = default_underline_color;
3318 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3319 vc->vc_halfcolor = 0x08; /* grey */
3320 init_waitqueue_head(&vc->paste_wait);
3321 reset_terminal(vc, do_clear);
3322}
3323
3324/*
3325 * This routine initializes console interrupts, and does nothing
3326 * else. If you want the screen to clear, call tty_write with
3327 * the appropriate escape-sequence.
3328 */
3329
3330static int __init con_init(void)
3331{
3332 const char *display_desc = NULL;
3333 struct vc_data *vc;
3e795de7 3334 unsigned int currcons = 0, i;
1da177e4 3335
ac751efa 3336 console_lock();
1da177e4 3337
805ece2a
AS		 3338 if (!conswitchp)
3339 conswitchp = &dummy_con;
3340 display_desc = conswitchp->con_startup();
1da177e4
LT		 3341 if (!display_desc) {
3342 fg_console = 0;
ac751efa 3343 console_unlock();
1da177e4
LT		 3344 return 0;
3345 }
3346
3e795de7
AD		 3347 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3348 struct con_driver *con_driver = &registered_con_driver[i];
3349
3350 if (con_driver->con == NULL) {
3351 con_driver->con = conswitchp;
3352 con_driver->desc = display_desc;
3353 con_driver->flag = CON_DRIVER_FLAG_INIT;
3354 con_driver->first = 0;
3355 con_driver->last = MAX_NR_CONSOLES - 1;
3356 break;
3357 }
3358 }
3359
3360 for (i = 0; i < MAX_NR_CONSOLES; i++)
3361 con_driver_map[i] = conswitchp;
3362
1da177e4
LT		 3363 if (blankinterval) {
3364 blank_state = blank_normal_wait;
f324edc8 3365 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3366 }
3367
1da177e4 3368 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3369 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3370 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3371 tty_port_init(&vc->port);
1da177e4 3372 visual_init(vc, currcons, 1);
a5f4f52e 3373 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3374 vc_init(vc, vc->vc_rows, vc->vc_cols,
3375 currcons || !vc->vc_sw->con_save_screen);
3376 }
3377 currcons = fg_console = 0;
3378 master_display_fg = vc = vc_cons[currcons].d;
3379 set_origin(vc);
3380 save_screen(vc);
3381 gotoxy(vc, vc->vc_x, vc->vc_y);
3382 csi_J(vc, 0);
3383 update_screen(vc);
5da527aa 3384 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3385 vc->vc_can_do_color ? "colour" : "mono",
3386 display_desc, vc->vc_cols, vc->vc_rows);
3387 printable = 1;
1da177e4 3388
ac751efa 3389 console_unlock();
1da177e4
LT		 3390
3391#ifdef CONFIG_VT_CONSOLE
3392 register_console(&vt_console_driver);
3393#endif
3394 return 0;
3395}
3396console_initcall(con_init);
3397
b68e31d0 3398static const struct tty_operations con_ops = {
bc1e99d9 3399 .install = con_install,
1da177e4
LT		 3400 .open = con_open,
3401 .close = con_close,
3402 .write = con_write,
3403 .write_room = con_write_room,
3404 .put_char = con_put_char,
3405 .flush_chars = con_flush_chars,
3406 .chars_in_buffer = con_chars_in_buffer,
3407 .ioctl = vt_ioctl,
e9216651
AB		 3408#ifdef CONFIG_COMPAT
3409 .compat_ioctl = vt_compat_ioctl,
3410#endif
1da177e4
LT		 3411 .stop = con_stop,
3412 .start = con_start,
3413 .throttle = con_throttle,
3414 .unthrottle = con_unthrottle,
8c9a9dd0 3415 .resize = vt_resize,
feebed65 3416 .shutdown = con_shutdown
1da177e4
LT		 3417};
3418
d81ed103
AC		 3419static struct cdev vc0_cdev;
3420
fbc92a34
KS		 3421static ssize_t show_tty_active(struct device *dev,
3422 struct device_attribute *attr, char *buf)
3423{
3424 return sprintf(buf, "tty%d\n", fg_console + 1);
3425}
3426static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3427
1083a7be
TI		 3428static struct attribute *vt_dev_attrs[] = {
3429 &dev_attr_active.attr,
3430 NULL
3431};
3432
3433ATTRIBUTE_GROUPS(vt_dev);
3434
d81ed103 3435int __init vty_init(const struct file_operations *console_fops)
1da177e4 3436{
d81ed103
AC		 3437 cdev_init(&vc0_cdev, console_fops);
3438 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3439 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3440 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3441 tty0dev = device_create_with_groups(tty_class, NULL,
3442 MKDEV(TTY_MAJOR, 0), NULL,
3443 vt_dev_groups, "tty0");
fbc92a34
KS		 3444 if (IS_ERR(tty0dev))
3445 tty0dev = NULL;
d81ed103 3446
1da177e4
LT		 3447 vcs_init();
3448
3449 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3450 if (!console_driver)
3451 panic("Couldn't allocate console driver\n");
2f16669d 3452
1da177e4
LT		 3453 console_driver->name = "tty";
3454 console_driver->name_base = 1;
3455 console_driver->major = TTY_MAJOR;
3456 console_driver->minor_start = 1;
3457 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3458 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3459 if (default_utf8)
3460 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3461 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3462 tty_set_operations(console_driver, &con_ops);
3463 if (tty_register_driver(console_driver))
3464 panic("Couldn't register console driver\n");
1da177e4
LT		 3465 kbd_init();
3466 console_map_init();
1da177e4
LT		 3467#ifdef CONFIG_MDA_CONSOLE
3468 mda_console_init();
3469#endif
3470 return 0;
3471}
3472
3473#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3474
3475static struct class *vtconsole_class;
3476
50e244cc 3477static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3478 int deflt)
1da177e4 3479{
3e795de7
AD		 3480 struct module *owner = csw->owner;
3481 const char *desc = NULL;
3482 struct con_driver *con_driver;
3483 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3484
1da177e4
LT		 3485 if (!try_module_get(owner))
3486 return -ENODEV;
3487
50e244cc 3488 WARN_CONSOLE_UNLOCKED();
1c8ce271 3489
3e795de7
AD		 3490 /* check if driver is registered */
3491 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3492 con_driver = &registered_con_driver[i];
3493
3494 if (con_driver->con == csw) {
3495 desc = con_driver->desc;
3496 retval = 0;
3497 break;
3498 }
3499 }
3500
3501 if (retval)
3502 goto err;
3503
3504 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3505 csw->con_startup();
3506 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3507 }
1c8ce271 3508
1da177e4
LT		 3509 if (deflt) {
3510 if (conswitchp)
3511 module_put(conswitchp->owner);
1c8ce271 3512
1da177e4
LT		 3513 __module_get(owner);
3514 conswitchp = csw;
3515 }
3516
3e795de7
AD		 3517 first = max(first, con_driver->first);
3518 last = min(last, con_driver->last);
3519
1da177e4
LT		 3520 for (i = first; i <= last; i++) {
3521 int old_was_color;
3522 struct vc_data *vc = vc_cons[i].d;
3523
3524 if (con_driver_map[i])
3525 module_put(con_driver_map[i]->owner);
3526 __module_get(owner);
3527 con_driver_map[i] = csw;
3528
3529 if (!vc || !vc->vc_sw)
3530 continue;
3531
3532 j = i;
1c8ce271 3533
6ca8dfd7 3534 if (con_is_visible(vc)) {
4ee1acce 3535 k = i;
1da177e4 3536 save_screen(vc);
4ee1acce
DH		 3537 }
3538
1da177e4
LT		 3539 old_was_color = vc->vc_can_do_color;
3540 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3541 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3542 visual_init(vc, i, 0);
1c8ce271 3543 set_origin(vc);
1da177e4
LT		 3544 update_attr(vc);
3545
3546 /* If the console changed between mono <-> color, then
3547 * the attributes in the screenbuf will be wrong. The
3548 * following resets all attributes to something sane.
3549 */
3550 if (old_was_color != vc->vc_can_do_color)
3551 clear_buffer_attributes(vc);
1da177e4 3552 }
4ee1acce 3553
1ffdda95 3554 pr_info("Console: switching ");
1da177e4 3555 if (!deflt)
bccf1da3 3556 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3557 if (j >= 0) {
3558 struct vc_data *vc = vc_cons[j].d;
3559
bccf1da3
JP		 3560 pr_cont("to %s %s %dx%d\n",
3561 vc->vc_can_do_color ? "colour" : "mono",
3562 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3563
3564 if (k >= 0) {
3565 vc = vc_cons[k].d;
3566 update_screen(vc);
3567 }
bccf1da3
JP		 3568 } else {
3569 pr_cont("to %s\n", desc);
3570 }
1da177e4 3571
3e795de7
AD		 3572 retval = 0;
3573err:
1da177e4 3574 module_put(owner);
3e795de7
AD		 3575 return retval;
3576};
1da177e4 3577
50e244cc 3578
13ae6645 3579#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86 3580int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3581{
3e795de7
AD		 3582 struct module *owner = csw->owner;
3583 const struct consw *defcsw = NULL;
3584 struct con_driver *con_driver = NULL, *con_back = NULL;
3585 int i, retval = -ENODEV;
1da177e4 3586
3e795de7
AD		 3587 if (!try_module_get(owner))
3588 return -ENODEV;
3589
e93a9a86 3590 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3591
3592 /* check if driver is registered and if it is unbindable */
3593 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3594 con_driver = &registered_con_driver[i];
3595
3596 if (con_driver->con == csw &&
6db4063c 3597 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3598 retval = 0;
3599 break;
3600 }
3601 }
3602
e93a9a86 3603 if (retval)
3e795de7 3604 goto err;
3e795de7 3605
6db4063c
AD		 3606 retval = -ENODEV;
3607
3e795de7
AD		 3608 /* check if backup driver exists */
3609 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3610 con_back = &registered_con_driver[i];
3611
249f7b3e 3612 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3613 defcsw = con_back->con;
3614 retval = 0;
3615 break;
3616 }
3617 }
3618
e93a9a86 3619 if (retval)
3e795de7 3620 goto err;
3e795de7 3621
e93a9a86 3622 if (!con_is_bound(csw))
3e795de7 3623 goto err;
3e795de7
AD		 3624
3625 first = max(first, con_driver->first);
3626 last = min(last, con_driver->last);
3627
3628 for (i = first; i <= last; i++) {
1da177e4
LT		 3629 if (con_driver_map[i] == csw) {
3630 module_put(csw->owner);
3631 con_driver_map[i] = NULL;
3632 }
3e795de7
AD		 3633 }
3634
3635 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3636 const struct consw *defconsw = conswitchp;
3637
3e795de7
AD		 3638 defcsw->con_startup();
3639 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3640 /*
3641 * vgacon may change the default driver to point
3642 * to dummycon, we restore it here...
3643 */
3644 conswitchp = defconsw;
3e795de7
AD		 3645 }
3646
3647 if (!con_is_bound(csw))
3648 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3649
6db4063c 3650 /* ignore return value, binding should not fail */
50e244cc 3651 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3652err:
3653 module_put(owner);
3654 return retval;
3655
3656}
e93a9a86 3657EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3658
6db4063c
AD		 3659static int vt_bind(struct con_driver *con)
3660{
3661 const struct consw *defcsw = NULL, *csw = NULL;
3662 int i, more = 1, first = -1, last = -1, deflt = 0;
3663
77232f79 3664 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3665 goto err;
3666
3667 csw = con->con;
3668
3669 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3670 struct con_driver *con = &registered_con_driver[i];
3671
3672 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3673 defcsw = con->con;
3674 break;
3675 }
3676 }
3677
3678 if (!defcsw)
3679 goto err;
3680
3681 while (more) {
3682 more = 0;
3683
3684 for (i = con->first; i <= con->last; i++) {
3685 if (con_driver_map[i] == defcsw) {
3686 if (first == -1)
3687 first = i;
3688 last = i;
3689 more = 1;
3690 } else if (first != -1)
3691 break;
3692 }
3693
3694 if (first == 0 && last == MAX_NR_CONSOLES -1)
3695 deflt = 1;
3696
4c215fe8 3697 if (first != -1)
c62a1e57 3698 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3699
3700 first = -1;
3701 last = -1;
3702 deflt = 0;
3703 }
3704
3705err:
3706 return 0;
3707}
3708
3709static int vt_unbind(struct con_driver *con)
3710{
3711 const struct consw *csw = NULL;
3712 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3713 int ret;
6db4063c 3714
77232f79 3715 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3716 goto err;
3717
3718 csw = con->con;
3719
3720 while (more) {
3721 more = 0;
3722
3723 for (i = con->first; i <= con->last; i++) {
3724 if (con_driver_map[i] == csw) {
3725 if (first == -1)
3726 first = i;
3727 last = i;
3728 more = 1;
3729 } else if (first != -1)
3730 break;
3731 }
3732
3733 if (first == 0 && last == MAX_NR_CONSOLES -1)
3734 deflt = 1;
3735
618f2b90 3736 if (first != -1) {
f418f2ec 3737 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3738 if (ret != 0)
3739 return ret;
618f2b90 3740 }
6db4063c
AD		 3741
3742 first = -1;
3743 last = -1;
3744 deflt = 0;
3745 }
3746
3747err:
3748 return 0;
3749}
13ae6645
AD		 3750#else
3751static inline int vt_bind(struct con_driver *con)
3752{
3753 return 0;
3754}
3755static inline int vt_unbind(struct con_driver *con)
3756{
3757 return 0;
3758}
3759#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3760
805952a8 3761static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3762 const char *buf, size_t count)
3763{
805952a8 3764 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3765 int bind = simple_strtoul(buf, NULL, 0);
3766
4c215fe8
ID		 3767 console_lock();
3768
6db4063c
AD		 3769 if (bind)
3770 vt_bind(con);
3771 else
3772 vt_unbind(con);
3773
4c215fe8
ID		 3774 console_unlock();
3775
6db4063c
AD		 3776 return count;
3777}
3778
805952a8
GKH		 3779static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3780 char *buf)
6db4063c 3781{
805952a8 3782 struct con_driver *con = dev_get_drvdata(dev);
61d51456
DV		 3783 int bind;
3784
3785 console_lock();
3786 bind = con_is_bound(con->con);
3787 console_unlock();
6db4063c
AD		 3788
3789 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3790}
3791
805952a8
GKH		 3792static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3793 char *buf)
6db4063c 3794{
805952a8 3795 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3796
3797 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3798 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3799 con->desc);
3800
3801}
3802
1083a7be
TI		 3803static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3804static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3805
3806static struct attribute *con_dev_attrs[] = {
3807 &dev_attr_bind.attr,
3808 &dev_attr_name.attr,
3809 NULL
6db4063c
AD		 3810};
3811
1083a7be
TI		 3812ATTRIBUTE_GROUPS(con_dev);
3813
805952a8 3814static int vtconsole_init_device(struct con_driver *con)
6db4063c 3815{
928e964f 3816 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3817 return 0;
6db4063c
AD		 3818}
3819
805952a8 3820static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3821{
1083a7be 3822 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3823}
3824
3e795de7
AD		 3825/**
3826 * con_is_bound - checks if driver is bound to the console
3827 * @csw: console driver
3828 *
3829 * RETURNS: zero if unbound, nonzero if bound
3830 *
3831 * Drivers can call this and if zero, they should release
3832 * all resources allocated on con_startup()
3833 */
3834int con_is_bound(const struct consw *csw)
3835{
3836 int i, bound = 0;
3837
ddde3c18
DV		 3838 WARN_CONSOLE_UNLOCKED();
3839
3e795de7
AD		 3840 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3841 if (con_driver_map[i] == csw) {
3842 bound = 1;
3843 break;
3844 }
3845 }
3846
3847 return bound;
3848}
3849EXPORT_SYMBOL(con_is_bound);
3850
ddde3c18
DV		 3851/**
3852 * con_is_visible - checks whether the current console is visible
3853 * @vc: virtual console
3854 *
3855 * RETURNS: zero if not visible, nonzero if visible
3856 */
3857bool con_is_visible(const struct vc_data *vc)
3858{
3859 WARN_CONSOLE_UNLOCKED();
3860
3861 return *vc->vc_display_fg == vc;
3862}
3863EXPORT_SYMBOL(con_is_visible);
3864
b45cfba4
JB		 3865/**
3866 * con_debug_enter - prepare the console for the kernel debugger
3867 * @sw: console driver
3868 *
3869 * Called when the console is taken over by the kernel debugger, this
3870 * function needs to save the current console state, then put the console
3871 * into a state suitable for the kernel debugger.
3872 *
3873 * RETURNS:
3874 * Zero on success, nonzero if a failure occurred when trying to prepare
3875 * the console for the debugger.
3876 */
3877int con_debug_enter(struct vc_data *vc)
3878{
3879 int ret = 0;
3880
3881 saved_fg_console = fg_console;
3882 saved_last_console = last_console;
3883 saved_want_console = want_console;
3884 saved_vc_mode = vc->vc_mode;
beed5336 3885 saved_console_blanked = console_blanked;
b45cfba4
JB		 3886 vc->vc_mode = KD_TEXT;
3887 console_blanked = 0;
3888 if (vc->vc_sw->con_debug_enter)
3889 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3890#ifdef CONFIG_KGDB_KDB
3891 /* Set the initial LINES variable if it is not already set */
3892 if (vc->vc_rows < 999) {
3893 int linecount;
3894 char lns[4];
3895 const char *setargs[3] = {
3896 "set",
3897 "LINES",
3898 lns,
3899 };
3900 if (kdbgetintenv(setargs[0], &linecount)) {
3901 snprintf(lns, 4, "%i", vc->vc_rows);
3902 kdb_set(2, setargs);
3903 }
3904 }
17b572e8
JW		 3905 if (vc->vc_cols < 999) {
3906 int colcount;
3907 char cols[4];
3908 const char *setargs[3] = {
3909 "set",
3910 "COLUMNS",
3911 cols,
3912 };
3913 if (kdbgetintenv(setargs[0], &colcount)) {
3914 snprintf(cols, 4, "%i", vc->vc_cols);
3915 kdb_set(2, setargs);
3916 }
3917 }
81d44507 3918#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3919 return ret;
3920}
3921EXPORT_SYMBOL_GPL(con_debug_enter);
3922
3923/**
3924 * con_debug_leave - restore console state
3925 * @sw: console driver
3926 *
3927 * Restore the console state to what it was before the kernel debugger
3928 * was invoked.
3929 *
3930 * RETURNS:
3931 * Zero on success, nonzero if a failure occurred when trying to restore
3932 * the console.
3933 */
3934int con_debug_leave(void)
3935{
3936 struct vc_data *vc;
3937 int ret = 0;
3938
3939 fg_console = saved_fg_console;
3940 last_console = saved_last_console;
3941 want_console = saved_want_console;
beed5336 3942 console_blanked = saved_console_blanked;
b45cfba4
JB		 3943 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3944
3945 vc = vc_cons[fg_console].d;
3946 if (vc->vc_sw->con_debug_leave)
3947 ret = vc->vc_sw->con_debug_leave(vc);
3948 return ret;
3949}
3950EXPORT_SYMBOL_GPL(con_debug_leave);
3951
50e244cc 3952static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3953{
3954 struct module *owner = csw->owner;
3955 struct con_driver *con_driver;
3956 const char *desc;
96317e9e 3957 int i, retval;
3e795de7 3958
50e244cc
AC		 3959 WARN_CONSOLE_UNLOCKED();
3960
3e795de7
AD		 3961 if (!try_module_get(owner))
3962 return -ENODEV;
3963
3e795de7
AD		 3964 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3965 con_driver = &registered_con_driver[i];
3966
3967 /* already registered */
96317e9e 3968 if (con_driver->con == csw) {
c55c63c6 3969 retval = -EBUSY;
96317e9e
JS		 3970 goto err;
3971 }
3e795de7
AD		 3972 }
3973
3e795de7 3974 desc = csw->con_startup();
6798df4c
JS		 3975 if (!desc) {
3976 retval = -ENODEV;
3e795de7 3977 goto err;
6798df4c 3978 }
3e795de7
AD		 3979
3980 retval = -EINVAL;
3981
3982 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3983 con_driver = &registered_con_driver[i];
3984
d364b5c3
ID		 3985 if (con_driver->con == NULL &&
3986 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3987 con_driver->con = csw;
3988 con_driver->desc = desc;
6db4063c
AD		 3989 con_driver->node = i;
3990 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3991 CON_DRIVER_FLAG_INIT;
3992 con_driver->first = first;
3993 con_driver->last = last;
3994 retval = 0;
3995 break;
3996 }
3997 }
3998
6db4063c
AD		 3999 if (retval)
4000 goto err;
4001
1083a7be
TI		 4002 con_driver->dev =
4003 device_create_with_groups(vtconsole_class, NULL,
4004 MKDEV(0, con_driver->node),
4005 con_driver, con_dev_groups,
4006 "vtcon%i", con_driver->node);
805952a8 4007 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 4008 pr_warn("Unable to create device for %s; errno = %ld\n",
4009 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 4010 con_driver->dev = NULL;
6db4063c 4011 } else {
805952a8 4012 vtconsole_init_device(con_driver);
6db4063c 4013 }
928e964f 4014
3e795de7 4015err:
3e795de7
AD		 4016 module_put(owner);
4017 return retval;
4018}
50e244cc 4019
3e795de7
AD		 4020
4021/**
50539dd4 4022 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 4023 * @csw: console driver
4024 *
4025 * DESCRIPTION: All drivers that registers to the console layer must
4026 * call this function upon exit, or if the console driver is in a state
4027 * where it won't be able to handle console services, such as the
4028 * framebuffer console without loaded framebuffer drivers.
4029 *
4030 * The driver must unbind first prior to unregistration.
4031 */
e93a9a86
TI		 4032int do_unregister_con_driver(const struct consw *csw)
4033{
d9c660e7 4034 int i;
3e795de7
AD		 4035
4036 /* cannot unregister a bound driver */
4037 if (con_is_bound(csw))
d9c660e7
DV		 4038 return -EBUSY;
4039
4040 if (csw == conswitchp)
4041 return -EINVAL;
3e795de7
AD		 4042
4043 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4044 struct con_driver *con_driver = &registered_con_driver[i];
4045
2cf30f75 4046 if (con_driver->con == csw) {
d364b5c3
ID		 4047 /*
4048 * Defer the removal of the sysfs entries since that
4049 * will acquire the kernfs s_active lock and we can't
4050 * acquire this lock while holding the console lock:
4051 * the unbind sysfs entry imposes already the opposite
4052 * order. Reset con already here to prevent any later
4053 * lookup to succeed and mark this slot as zombie, so
4054 * it won't get reused until we complete the removal
4055 * in the deferred work.
4056 */
3e795de7 4057 con_driver->con = NULL;
d364b5c3
ID		 4058 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4059 schedule_work(&con_driver_unregister_work);
4060
d9c660e7 4061 return 0;
3e795de7
AD		 4062 }
4063 }
d9c660e7
DV		 4064
4065 return -ENODEV;
3e795de7 4066}
e93a9a86 4067EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4068
d364b5c3
ID		 4069static void con_driver_unregister_callback(struct work_struct *ignored)
4070{
4071 int i;
4072
4073 console_lock();
4074
4075 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4076 struct con_driver *con_driver = &registered_con_driver[i];
4077
4078 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4079 continue;
4080
4081 console_unlock();
4082
4083 vtconsole_deinit_device(con_driver);
4084 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4085
4086 console_lock();
4087
4088 if (WARN_ON_ONCE(con_driver->con))
4089 con_driver->con = NULL;
4090 con_driver->desc = NULL;
4091 con_driver->dev = NULL;
4092 con_driver->node = 0;
4093 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4094 con_driver->flag = 0;
4095 con_driver->first = 0;
4096 con_driver->last = 0;
4097 }
4098
4099 console_unlock();
4100}
4101
3e795de7
AD		 4102/*
4103 * If we support more console drivers, this function is used
4104 * when a driver wants to take over some existing consoles
4105 * and become default driver for newly opened ones.
4106 *
0095ab42 4107 * do_take_over_console is basically a register followed by bind
50e244cc
AC		 4108 */
4109int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4110{
4111 int err;
4112
4113 err = do_register_con_driver(csw, first, last);
4114 /*
4115 * If we get an busy error we still want to bind the console driver
4116 * and return success, as we may have unbound the console driver
4117 * but not unregistered it.
4118 */
4119 if (err == -EBUSY)
4120 err = 0;
4121 if (!err)
4122 do_bind_con_driver(csw, first, last, deflt);
4123
4124 return err;
4125}
4126EXPORT_SYMBOL_GPL(do_take_over_console);
4127
3e795de7
AD		 4128
4129/*
4130 * give_up_console is a wrapper to unregister_con_driver. It will only
4131 * work if driver is fully unbound.
4132 */
4133void give_up_console(const struct consw *csw)
4134{
70125e76
WY		 4135 console_lock();
4136 do_unregister_con_driver(csw);
4137 console_unlock();
3e795de7
AD		 4138}
4139
6db4063c 4140static int __init vtconsole_class_init(void)
3e795de7 4141{
6db4063c 4142 int i;
3e795de7 4143
6db4063c
AD		 4144 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4145 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4146 pr_warn("Unable to create vt console class; errno = %ld\n",
4147 PTR_ERR(vtconsole_class));
6db4063c
AD		 4148 vtconsole_class = NULL;
4149 }
3e795de7 4150
6db4063c 4151 /* Add system drivers to sysfs */
3e795de7
AD		 4152 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4153 struct con_driver *con = &registered_con_driver[i];
4154
805952a8 4155 if (con->con && !con->dev) {
1083a7be
TI		 4156 con->dev =
4157 device_create_with_groups(vtconsole_class, NULL,
4158 MKDEV(0, con->node),
4159 con, con_dev_groups,
4160 "vtcon%i", con->node);
6db4063c 4161
805952a8 4162 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4163 pr_warn("Unable to create device for %s; errno = %ld\n",
4164 con->desc, PTR_ERR(con->dev));
805952a8 4165 con->dev = NULL;
6db4063c 4166 } else {
805952a8 4167 vtconsole_init_device(con);
6db4063c 4168 }
3e795de7 4169 }
3e795de7
AD		 4170 }
4171
3e795de7
AD		 4172 return 0;
4173}
6db4063c 4174postcore_initcall(vtconsole_class_init);
3e795de7 4175
1da177e4
LT		 4176#endif
4177
4178/*
4179 * Screen blanking
4180 */
4181
403aac96 4182static int set_vesa_blanking(char __user *p)
1da177e4 4183{
403aac96
YY		 4184 unsigned int mode;
4185
4186 if (get_user(mode, p + 1))
4187 return -EFAULT;
4188
4189 vesa_blank_mode = (mode < 4) ? mode : 0;
4190 return 0;
1da177e4
LT		 4191}
4192
1da177e4
LT		 4193void do_blank_screen(int entering_gfx)
4194{
4195 struct vc_data *vc = vc_cons[fg_console].d;
4196 int i;
4197
a135513c
DV		 4198 might_sleep();
4199
1da177e4
LT		 4200 WARN_CONSOLE_UNLOCKED();
4201
4202 if (console_blanked) {
4203 if (blank_state == blank_vesa_wait) {
4204 blank_state = blank_off;
d060a321 4205 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4206 }
4207 return;
4208 }
1da177e4
LT		 4209
4210 /* entering graphics mode? */
4211 if (entering_gfx) {
4212 hide_cursor(vc);
4213 save_screen(vc);
4214 vc->vc_sw->con_blank(vc, -1, 1);
4215 console_blanked = fg_console + 1;
b6e8f00f 4216 blank_state = blank_off;
1da177e4
LT		 4217 set_origin(vc);
4218 return;
4219 }
4220
b6e8f00f 4221 blank_state = blank_off;
4222
1da177e4
LT		 4223 /* don't blank graphics */
4224 if (vc->vc_mode != KD_TEXT) {
4225 console_blanked = fg_console + 1;
4226 return;
4227 }
4228
4229 hide_cursor(vc);
4230 del_timer_sync(&console_timer);
4231 blank_timer_expired = 0;
4232
4233 save_screen(vc);
4234 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4235 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4236 console_blanked = fg_console + 1;
4237 if (i)
4238 set_origin(vc);
4239
4240 if (console_blank_hook && console_blank_hook(1))
4241 return;
4242
d060a321 4243 if (vesa_off_interval && vesa_blank_mode) {
030babac 4244 blank_state = blank_vesa_wait;
1da177e4
LT		 4245 mod_timer(&console_timer, jiffies + vesa_off_interval);
4246 }
8b92e87d 4247 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4248}
4249EXPORT_SYMBOL(do_blank_screen);
4250
4251/*
4252 * Called by timer as well as from vt_console_driver
4253 */
4254void do_unblank_screen(int leaving_gfx)
4255{
4256 struct vc_data *vc;
4257
4258 /* This should now always be called from a "sane" (read: can schedule)
4259 * context for the sake of the low level drivers, except in the special
4260 * case of oops_in_progress
4261 */
4262 if (!oops_in_progress)
4263 might_sleep();
4264
4265 WARN_CONSOLE_UNLOCKED();
4266
4267 ignore_poke = 0;
4268 if (!console_blanked)
4269 return;
4270 if (!vc_cons_allocated(fg_console)) {
4271 /* impossible */
e620e548
JP		 4272 pr_warn("unblank_screen: tty %d not allocated ??\n",
4273 fg_console + 1);
1da177e4
LT		 4274 return;
4275 }
4276 vc = vc_cons[fg_console].d;
8d7fc299 4277 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4278 return; /* but leave console_blanked != 0 */
4279
4280 if (blankinterval) {
f324edc8 4281 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4282 blank_state = blank_normal_wait;
4283 }
4284
4285 console_blanked = 0;
8d7fc299 4286 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4287 /* Low-level driver cannot restore -> do it ourselves */
4288 update_screen(vc);
4289 if (console_blank_hook)
4290 console_blank_hook(0);
4291 set_palette(vc);
4292 set_cursor(vc);
8b92e87d 4293 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4294}
4295EXPORT_SYMBOL(do_unblank_screen);
4296
4297/*
4298 * This is called by the outside world to cause a forced unblank, mostly for
4299 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4300 * call it with 1 as an argument and so force a mode restore... that may kill
4301 * X or at least garbage the screen but would also make the Oops visible...
4302 */
4303void unblank_screen(void)
4304{
4305 do_unblank_screen(0);
4306}
4307
4308/*
70522e12 4309 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4310 * (console operations can still happen at irq time, but only from printk which
70522e12 4311 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4312 */
24ed960a 4313static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4314{
4315 blank_timer_expired = 1;
4316 schedule_work(&console_work);
4317}
4318
4319void poke_blanked_console(void)
4320{
4321 WARN_CONSOLE_UNLOCKED();
4322
4323 /* Add this so we quickly catch whoever might call us in a non
4324 * safe context. Nowadays, unblank_screen() isn't to be called in
4325 * atomic contexts and is allowed to schedule (with the special case
4326 * of oops_in_progress, but that isn't of any concern for this
4327 * function. --BenH.
4328 */
4329 might_sleep();
4330
4331 /* This isn't perfectly race free, but a race here would be mostly harmless,
4332 * at worse, we'll do a spurrious blank and it's unlikely
4333 */
4334 del_timer(&console_timer);
4335 blank_timer_expired = 0;
4336
4337 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4338 return;
4339 if (console_blanked)
4340 unblank_screen();
4341 else if (blankinterval) {
f324edc8 4342 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4343 blank_state = blank_normal_wait;
4344 }
4345}
4346
4347/*
4348 * Palettes
4349 */
4350
4351static void set_palette(struct vc_data *vc)
4352{
4353 WARN_CONSOLE_UNLOCKED();
4354
709280da 4355 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4356 vc->vc_sw->con_set_palette(vc, color_table);
4357}
4358
1da177e4
LT		 4359/*
4360 * Load palette into the DAC registers. arg points to a colour
4361 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4362 */
4363
4364int con_set_cmap(unsigned char __user *arg)
4365{
871bdea6
MG		 4366 int i, j, k;
4367 unsigned char colormap[3*16];
4368
4369 if (copy_from_user(colormap, arg, sizeof(colormap)))
4370 return -EFAULT;
1da177e4 4371
ac751efa 4372 console_lock();
871bdea6
MG		 4373 for (i = k = 0; i < 16; i++) {
4374 default_red[i] = colormap[k++];
4375 default_grn[i] = colormap[k++];
4376 default_blu[i] = colormap[k++];
4377 }
4378 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4379 if (!vc_cons_allocated(i))
4380 continue;
4381 for (j = k = 0; j < 16; j++) {
4382 vc_cons[i].d->vc_palette[k++] = default_red[j];
4383 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4384 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4385 }
4386 set_palette(vc_cons[i].d);
4387 }
ac751efa 4388 console_unlock();
1da177e4 4389
871bdea6 4390 return 0;
1da177e4
LT		 4391}
4392
4393int con_get_cmap(unsigned char __user *arg)
4394{
871bdea6
MG		 4395 int i, k;
4396 unsigned char colormap[3*16];
1da177e4 4397
ac751efa 4398 console_lock();
871bdea6
MG		 4399 for (i = k = 0; i < 16; i++) {
4400 colormap[k++] = default_red[i];
4401 colormap[k++] = default_grn[i];
4402 colormap[k++] = default_blu[i];
4403 }
ac751efa 4404 console_unlock();
1da177e4 4405
871bdea6
MG		 4406 if (copy_to_user(arg, colormap, sizeof(colormap)))
4407 return -EFAULT;
4408
4409 return 0;
1da177e4
LT		 4410}
4411
4412void reset_palette(struct vc_data *vc)
4413{
4414 int j, k;
4415 for (j=k=0; j<16; j++) {
4416 vc->vc_palette[k++] = default_red[j];
4417 vc->vc_palette[k++] = default_grn[j];
4418 vc->vc_palette[k++] = default_blu[j];
4419 }
4420 set_palette(vc);
4421}
4422
4423/*
4424 * Font switching
4425 *
4426 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4427 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4428 * depending on width) reserved for each character which is kinda wasty, but
4429 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4430 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4431 * format (maybe we should add a `fontoffset' field to the `display'
4432 * structure so we won't have to convert the fontdata all the time.
4433 * /Jes
4434 */
4435
4436#define max_font_size 65536
4437
4438static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4439{
4440 struct console_font font;
4441 int rc = -EINVAL;
4442 int c;
4443
1da177e4
LT		 4444 if (op->data) {
4445 font.data = kmalloc(max_font_size, GFP_KERNEL);
4446 if (!font.data)
4447 return -ENOMEM;
4448 } else
4449 font.data = NULL;
4450
ac751efa 4451 console_lock();
edab558f
AC		 4452 if (vc->vc_mode != KD_TEXT)
4453 rc = -EINVAL;
4454 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4455 rc = vc->vc_sw->con_font_get(vc, &font);
4456 else
4457 rc = -ENOSYS;
ac751efa 4458 console_unlock();
1da177e4
LT		 4459
4460 if (rc)
4461 goto out;
4462
4463 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4464
1da177e4
LT		 4465 if (op->data && font.charcount > op->charcount)
4466 rc = -ENOSPC;
4467 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4468 if (font.width > op->width || font.height > op->height)
4469 rc = -ENOSPC;
4470 } else {
4471 if (font.width != 8)
4472 rc = -EIO;
4473 else if ((op->height && font.height > op->height) ||
4474 font.height > 32)
4475 rc = -ENOSPC;
4476 }
4477 if (rc)
4478 goto out;
4479
4480 op->height = font.height;
4481 op->width = font.width;
4482 op->charcount = font.charcount;
4483
4484 if (op->data && copy_to_user(op->data, font.data, c))
4485 rc = -EFAULT;
4486
4487out:
4488 kfree(font.data);
4489 return rc;
4490}
4491
4492static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4493{
4494 struct console_font font;
4495 int rc = -EINVAL;
4496 int size;
4497
4498 if (vc->vc_mode != KD_TEXT)
4499 return -EINVAL;
4500 if (!op->data)
4501 return -EINVAL;
4502 if (op->charcount > 512)
4503 return -EINVAL;
8ffb8209
MX		 4504 if (op->width <= 0 || op->width > 32 || op->height > 32)
4505 return -EINVAL;
4506 size = (op->width+7)/8 * 32 * op->charcount;
4507 if (size > max_font_size)
4508 return -ENOSPC;
4509
4510 font.data = memdup_user(op->data, size);
4511 if (IS_ERR(font.data))
4512 return PTR_ERR(font.data);
4513
1da177e4
LT		 4514 if (!op->height) { /* Need to guess font height [compat] */
4515 int h, i;
8ffb8209
MX		 4516 u8 *charmap = font.data;
4517
4518 /*
4519 * If from KDFONTOP ioctl, don't allow things which can be done
4520 * in userland,so that we can get rid of this soon
4521 */
4522 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4523 kfree(font.data);
1da177e4 4524 return -EINVAL;
8ffb8209
MX		 4525 }
4526
1da177e4 4527 for (h = 32; h > 0; h--)
8ffb8209
MX		 4528 for (i = 0; i < op->charcount; i++)
4529 if (charmap[32*i+h-1])
1da177e4 4530 goto nonzero;
8ffb8209
MX		 4531
4532 kfree(font.data);
1da177e4 4533 return -EINVAL;
8ffb8209 4534
1da177e4
LT		 4535 nonzero:
4536 op->height = h;
4537 }
8ffb8209 4538
1da177e4 4539 font.charcount = op->charcount;
1da177e4 4540 font.width = op->width;
8ffb8209
MX		 4541 font.height = op->height;
4542
ac751efa 4543 console_lock();
edab558f
AC		 4544 if (vc->vc_mode != KD_TEXT)
4545 rc = -EINVAL;
4546 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4547 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4548 else
4549 rc = -ENOSYS;
ac751efa 4550 console_unlock();
1da177e4
LT		 4551 kfree(font.data);
4552 return rc;
4553}
4554
4555static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4556{
4557 struct console_font font = {.width = op->width, .height = op->height};
4558 char name[MAX_FONT_NAME];
4559 char *s = name;
4560 int rc;
4561
1da177e4
LT		 4562
4563 if (!op->data)
4564 s = NULL;
4565 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4566 return -EFAULT;
4567 else
4568 name[MAX_FONT_NAME - 1] = 0;
4569
ac751efa 4570 console_lock();
edab558f
AC		 4571 if (vc->vc_mode != KD_TEXT) {
4572 console_unlock();
4573 return -EINVAL;
4574 }
1da177e4
LT		 4575 if (vc->vc_sw->con_font_default)
4576 rc = vc->vc_sw->con_font_default(vc, &font, s);
4577 else
4578 rc = -ENOSYS;
ac751efa 4579 console_unlock();
1da177e4
LT		 4580 if (!rc) {
4581 op->width = font.width;
4582 op->height = font.height;
4583 }
4584 return rc;
4585}
4586
4587static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4588{
4589 int con = op->height;
4590 int rc;
4591
1da177e4 4592
ac751efa 4593 console_lock();
edab558f
AC		 4594 if (vc->vc_mode != KD_TEXT)
4595 rc = -EINVAL;
4596 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4597 rc = -ENOSYS;
4598 else if (con < 0 || !vc_cons_allocated(con))
4599 rc = -ENOTTY;
4600 else if (con == vc->vc_num) /* nothing to do */
4601 rc = 0;
4602 else
4603 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4604 console_unlock();
1da177e4
LT		 4605 return rc;
4606}
4607
4608int con_font_op(struct vc_data *vc, struct console_font_op *op)
4609{
4610 switch (op->op) {
4611 case KD_FONT_OP_SET:
4612 return con_font_set(vc, op);
4613 case KD_FONT_OP_GET:
4614 return con_font_get(vc, op);
4615 case KD_FONT_OP_SET_DEFAULT:
4616 return con_font_default(vc, op);
4617 case KD_FONT_OP_COPY:
4618 return con_font_copy(vc, op);
4619 }
4620 return -ENOSYS;
4621}
4622
4623/*
4624 * Interface exported to selection and vcs.
4625 */
4626
4627/* used by selection */
4628u16 screen_glyph(struct vc_data *vc, int offset)
4629{
4630 u16 w = scr_readw(screenpos(vc, offset, 1));
4631 u16 c = w & 0xff;
4632
4633 if (w & vc->vc_hi_font_mask)
4634 c |= 0x100;
4635 return c;
4636}
f7511d5f 4637EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4638
9bfdc261
AB		 4639u32 screen_glyph_unicode(struct vc_data *vc, int n)
4640{
4641 struct uni_screen *uniscr = get_vc_uniscr(vc);
4642
4643 if (uniscr)
4644 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4645 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4646}
4647EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4648
1da177e4
LT		 4649/* used by vcs - note the word offset */
4650unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4651{
4652 return screenpos(vc, 2 * w_offset, viewed);
4653}
88867e3d 4654EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4655
4656void getconsxy(struct vc_data *vc, unsigned char *p)
4657{
8a085494
NP		 4658 /* clamp values if they don't fit */
4659 p[0] = min(vc->vc_x, 0xFFu);
4660 p[1] = min(vc->vc_y, 0xFFu);
1da177e4
LT		 4661}
4662
4663void putconsxy(struct vc_data *vc, unsigned char *p)
4664{
9477e260 4665 hide_cursor(vc);
1da177e4
LT		 4666 gotoxy(vc, p[0], p[1]);
4667 set_cursor(vc);
4668}
4669
4670u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4671{
4672 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4673 return softcursor_original;
4674 return scr_readw(org);
4675}
4676
4677void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4678{
4679 scr_writew(val, org);
4680 if ((unsigned long)org == vc->vc_pos) {
4681 softcursor_original = -1;
4682 add_softcursor(vc);
4683 }
4684}
4685
432c9ed2
NP		 4686void vcs_scr_updated(struct vc_data *vc)
4687{
4688 notify_update(vc);
4689}
4690
35cc56f9
JS		 4691void vc_scrolldelta_helper(struct vc_data *c, int lines,
4692 unsigned int rolled_over, void *base, unsigned int size)
4693{
4694 unsigned long ubase = (unsigned long)base;
210fd746
JS		 4695 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4696 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4697 ptrdiff_t origin = (void *)c->vc_origin - base;
35cc56f9 4698 int margin = c->vc_size_row * 4;
7c918cdc 4699 int from, wrap, from_off, avail;
35cc56f9
JS		 4700
4701 /* Turn scrollback off */
4702 if (!lines) {
4703 c->vc_visible_origin = c->vc_origin;
4704 return;
4705 }
4706
4707 /* Do we have already enough to allow jumping from 0 to the end? */
210fd746 4708 if (rolled_over > scr_end + margin) {
7c918cdc
JS		 4709 from = scr_end;
4710 wrap = rolled_over + c->vc_size_row;
35cc56f9 4711 } else {
7c918cdc
JS		 4712 from = 0;
4713 wrap = size;
35cc56f9
JS		 4714 }
4715
7c918cdc
JS		 4716 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4717 avail = (origin - from + wrap) % wrap;
35cc56f9
JS		 4718
4719 /* Only a little piece would be left? Show all incl. the piece! */
7c918cdc 4720 if (avail < 2 * margin)
35cc56f9 4721 margin = 0;
7c918cdc
JS		 4722 if (from_off < margin)
4723 from_off = 0;
4724 if (from_off > avail - margin)
4725 from_off = avail;
35cc56f9 4726
7c918cdc 4727 c->vc_visible_origin = ubase + (from + from_off) % wrap;
35cc56f9
JS		 4728}
4729EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4730
1da177e4
LT		 4731/*
4732 * Visible symbols for modules
4733 */
4734
4735EXPORT_SYMBOL(color_table);
4736EXPORT_SYMBOL(default_red);
4737EXPORT_SYMBOL(default_grn);
4738EXPORT_SYMBOL(default_blu);
4739EXPORT_SYMBOL(update_region);
4740EXPORT_SYMBOL(redraw_screen);
4741EXPORT_SYMBOL(vc_resize);
4742EXPORT_SYMBOL(fg_console);
4743EXPORT_SYMBOL(console_blank_hook);
4744EXPORT_SYMBOL(console_blanked);
4745EXPORT_SYMBOL(vc_cons);
f6c06b68 4746EXPORT_SYMBOL(global_cursor_default);
1da177e4 4747#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4748EXPORT_SYMBOL(give_up_console);
4749#endif
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