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tty/n_hdlc: fix __might_sleep warning
[linux-2.6-block.git] / drivers / tty / vt / vt.c
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e3b3d0f5 1// SPDX-License-Identifier: GPL-2.0
1da177e4 2/*
1da177e4
LT		 3 * Copyright (C) 1991, 1992 Linus Torvalds
4 */
5
6/*
7 * Hopefully this will be a rather complete VT102 implementation.
8 *
9 * Beeping thanks to John T Kohl.
10 *
11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
12 * Chars, and VT100 enhancements by Peter MacDonald.
13 *
14 * Copy and paste function by Andrew Haylett,
15 * some enhancements by Alessandro Rubini.
16 *
17 * Code to check for different video-cards mostly by Galen Hunt,
18 * <g-hunt@ee.utah.edu>
19 *
20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
22 *
23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
24 * Resizing of consoles, aeb, 940926
25 *
26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
27 * <poe@daimi.aau.dk>
28 *
29 * User-defined bell sound, new setterm control sequences and printk
30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
31 *
32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
33 *
34 * Merge with the abstract console driver by Geert Uytterhoeven
35 * <geert@linux-m68k.org>, Jan 1997.
36 *
37 * Original m68k console driver modifications by
38 *
39 * - Arno Griffioen <arno@usn.nl>
40 * - David Carter <carter@cs.bris.ac.uk>
41 *
42 * The abstract console driver provides a generic interface for a text
43 * console. It supports VGA text mode, frame buffer based graphical consoles
44 * and special graphics processors that are only accessible through some
45 * registers (e.g. a TMS340x0 GSP).
46 *
47 * The interface to the hardware is specified using a special structure
48 * (struct consw) which contains function pointers to console operations
49 * (see <linux/console.h> for more information).
50 *
51 * Support for changeable cursor shape
52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
53 *
54 * Ported to i386 and con_scrolldelta fixed
55 * by Emmanuel Marty <core@ggi-project.org>, April 1998
56 *
57 * Resurrected character buffers in videoram plus lots of other trickery
58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
59 *
60 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 61 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 62 *
63 * Removed console_lock, enabled interrupts across all console operations
64 * 13 March 2001, Andrew Morton
d4328b40
AT		 65 *
66 * Fixed UTF-8 mode so alternate charset modes always work according
67 * to control sequences interpreted in do_con_trol function
68 * preserving backward VT100 semigraphics compatibility,
69 * malformed UTF sequences represented as sequences of replacement glyphs,
70 * original codes or '?' as a last resort if replacement glyph is undefined
71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 72 */
73
74#include <linux/module.h>
75#include <linux/types.h>
3f07c014 76#include <linux/sched/signal.h>
1da177e4
LT		 77#include <linux/tty.h>
78#include <linux/tty_flip.h>
79#include <linux/kernel.h>
80#include <linux/string.h>
81#include <linux/errno.h>
82#include <linux/kd.h>
83#include <linux/slab.h>
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
938 if (vc->vc_sw->con_flush_scrollback)
939 vc->vc_sw->con_flush_scrollback(vc);
940}
941
1da177e4
LT		 942/*
943 * Redrawing of screen
944 */
945
2a248307 946void clear_buffer_attributes(struct vc_data *vc)
1da177e4
LT		 947{
948 unsigned short *p = (unsigned short *)vc->vc_origin;
949 int count = vc->vc_screenbuf_size / 2;
950 int mask = vc->vc_hi_font_mask | 0xff;
951
952 for (; count > 0; count--, p++) {
953 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
954 }
955}
956
957void redraw_screen(struct vc_data *vc, int is_switch)
958{
959 int redraw = 0;
960
961 WARN_CONSOLE_UNLOCKED();
962
963 if (!vc) {
964 /* strange ... */
965 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
966 return;
967 }
968
969 if (is_switch) {
970 struct vc_data *old_vc = vc_cons[fg_console].d;
971 if (old_vc == vc)
972 return;
6ca8dfd7 973 if (!con_is_visible(vc))
1da177e4
LT		 974 redraw = 1;
975 *vc->vc_display_fg = vc;
976 fg_console = vc->vc_num;
977 hide_cursor(old_vc);
6ca8dfd7 978 if (!con_is_visible(old_vc)) {
1da177e4
LT		 979 save_screen(old_vc);
980 set_origin(old_vc);
981 }
fbc92a34
KS		 982 if (tty0dev)
983 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 984 } else {
985 hide_cursor(vc);
986 redraw = 1;
987 }
988
989 if (redraw) {
990 int update;
991 int old_was_color = vc->vc_can_do_color;
992
993 set_origin(vc);
994 update = vc->vc_sw->con_switch(vc);
995 set_palette(vc);
996 /*
997 * If console changed from mono<->color, the best we can do
998 * is to clear the buffer attributes. As it currently stands,
999 * rebuilding new attributes from the old buffer is not doable
1000 * without overly complex code.
1001 */
1002 if (old_was_color != vc->vc_can_do_color) {
1003 update_attr(vc);
1004 clear_buffer_attributes(vc);
1005 }
8fd4bd22 1006
8d7fc299 1007 if (update && vc->vc_mode != KD_GRAPHICS)
1da177e4
LT		 1008 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1009 }
1010 set_cursor(vc);
1011 if (is_switch) {
1012 set_leds();
1013 compute_shiftstate();
8182ec49 1014 notify_update(vc);
1da177e4
LT		 1015 }
1016}
1017
1018/*
1019 * Allocation, freeing and resizing of VTs.
1020 */
1021
1022int vc_cons_allocated(unsigned int i)
1023{
1024 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1025}
1026
1027static void visual_init(struct vc_data *vc, int num, int init)
1028{
1029 /* ++Geert: vc->vc_sw->con_init determines console size */
1030 if (vc->vc_sw)
1031 module_put(vc->vc_sw->owner);
1032 vc->vc_sw = conswitchp;
1033#ifndef VT_SINGLE_DRIVER
1034 if (con_driver_map[num])
1035 vc->vc_sw = con_driver_map[num];
1036#endif
1037 __module_get(vc->vc_sw->owner);
1038 vc->vc_num = num;
1039 vc->vc_display_fg = &master_display_fg;
08b33249
DZ		 1040 if (vc->vc_uni_pagedir_loc)
1041 con_free_unimap(vc);
1da177e4 1042 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
e4bdab70 1043 vc->vc_uni_pagedir = NULL;
1da177e4
LT		 1044 vc->vc_hi_font_mask = 0;
1045 vc->vc_complement_mask = 0;
1046 vc->vc_can_do_color = 0;
1b45996d 1047 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 1048 vc->vc_sw->con_init(vc, init);
1049 if (!vc->vc_complement_mask)
1050 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1051 vc->vc_s_complement_mask = vc->vc_complement_mask;
1052 vc->vc_size_row = vc->vc_cols << 1;
1053 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1054}
1055
1056int vc_allocate(unsigned int currcons) /* return 0 on success */
1057{
34902b7f
JS		 1058 struct vt_notifier_param param;
1059 struct vc_data *vc;
1060
1da177e4
LT		 1061 WARN_CONSOLE_UNLOCKED();
1062
1063 if (currcons >= MAX_NR_CONSOLES)
1064 return -ENXIO;
34902b7f
JS		 1065
1066 if (vc_cons[currcons].d)
1067 return 0;
1068
1069 /* due to the granularity of kmalloc, we waste some memory here */
1070 /* the alloc is done in two steps, to optimize the common situation
1071 of a 25x80 console (structsize=216, screenbuf_size=4000) */
1072 /* although the numbers above are not valid since long ago, the
1073 point is still up-to-date and the comment still has its value
1074 even if only as a historical artifact. --mj, July 1998 */
1075 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1076 if (!vc)
1da177e4 1077 return -ENOMEM;
34902b7f
JS		 1078
1079 vc_cons[currcons].d = vc;
1080 tty_port_init(&vc->port);
1081 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1082
1083 visual_init(vc, currcons, 1);
1084
1085 if (!*vc->vc_uni_pagedir_loc)
1da177e4 1086 con_set_default_unimap(vc);
f6c06b68 1087
21eff69a 1088 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
34902b7f
JS		 1089 if (!vc->vc_screenbuf)
1090 goto err_free;
1091
1092 /* If no drivers have overridden us and the user didn't pass a
1093 boot option, default to displaying the cursor */
1094 if (global_cursor_default == -1)
1095 global_cursor_default = 1;
1096
1097 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1098 vcs_make_sysfs(currcons);
1099 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
f6c06b68 1100
1da177e4 1101 return 0;
34902b7f
JS		 1102err_free:
1103 kfree(vc);
1104 vc_cons[currcons].d = NULL;
1105 return -ENOMEM;
1da177e4
LT		 1106}
1107
e400b6ec
AD		 1108static inline int resize_screen(struct vc_data *vc, int width, int height,
1109 int user)
1da177e4
LT		 1110{
1111 /* Resizes the resolution of the display adapater */
1112 int err = 0;
1113
1114 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 1115 err = vc->vc_sw->con_resize(vc, width, height, user);
1116
1da177e4
LT		 1117 return err;
1118}
1119
1120/*
1121 * Change # of rows and columns (0 means unchanged/the size of fg_console)
1122 * [this is to be used together with some user program
1123 * like resize that changes the hardware videomode]
1124 */
1125#define VC_RESIZE_MAXCOL (32767)
1126#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 1127
1128/**
1129 * vc_do_resize - resizing method for the tty
1130 * @tty: tty being resized
1131 * @real_tty: real tty (different to tty if a pty/tty pair)
1132 * @vc: virtual console private data
1133 * @cols: columns
1134 * @lines: lines
1135 *
1136 * Resize a virtual console, clipping according to the actual constraints.
1137 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 1138 * information and perform any necessary signal handling.
8c9a9dd0 1139 *
6a1c0680 1140 * Caller must hold the console semaphore. Takes the termios rwsem and
8c9a9dd0
AC		 1141 * ctrl_lock of the tty IFF a tty is passed.
1142 */
1143
fc6f6238
AC		 1144static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1145 unsigned int cols, unsigned int lines)
1da177e4
LT		 1146{
1147 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 1148 unsigned long end;
d8ae7242 1149 unsigned int old_rows, old_row_size, first_copied_row;
1da177e4 1150 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 1151 unsigned int user;
1da177e4 1152 unsigned short *newscreen;
d8ae7242 1153 struct uni_screen *new_uniscr = NULL;
1da177e4
LT		 1154
1155 WARN_CONSOLE_UNLOCKED();
1156
1157 if (!vc)
1158 return -ENXIO;
1159
e400b6ec
AD		 1160 user = vc->vc_resize_user;
1161 vc->vc_resize_user = 0;
1162
1da177e4
LT		 1163 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1164 return -EINVAL;
1165
1166 new_cols = (cols ? cols : vc->vc_cols);
1167 new_rows = (lines ? lines : vc->vc_rows);
1168 new_row_size = new_cols << 1;
1169 new_screen_size = new_row_size * new_rows;
1170
1171 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1172 return 0;
1173
32b2921e
DV		 1174 if (new_screen_size > (4 << 20))
1175 return -EINVAL;
21eff69a 1176 newscreen = kzalloc(new_screen_size, GFP_USER);
1da177e4
LT		 1177 if (!newscreen)
1178 return -ENOMEM;
1179
d8ae7242
NP		 1180 if (get_vc_uniscr(vc)) {
1181 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1182 if (!new_uniscr) {
1183 kfree(newscreen);
1184 return -ENOMEM;
1185 }
1186 }
1187
009e39ae
SD		 1188 if (vc == sel_cons)
1189 clear_selection();
1190
1da177e4 1191 old_rows = vc->vc_rows;
1da177e4 1192 old_row_size = vc->vc_size_row;
1da177e4 1193
e400b6ec 1194 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 1195 if (err) {
1196 kfree(newscreen);
d8ae7242 1197 kfree(new_uniscr);
1da177e4
LT		 1198 return err;
1199 }
1200
1201 vc->vc_rows = new_rows;
1202 vc->vc_cols = new_cols;
1203 vc->vc_size_row = new_row_size;
1204 vc->vc_screenbuf_size = new_screen_size;
1205
1206 rlth = min(old_row_size, new_row_size);
1207 rrem = new_row_size - rlth;
1208 old_origin = vc->vc_origin;
1209 new_origin = (long) newscreen;
1210 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 1211
1212 if (vc->vc_y > new_rows) {
1213 if (old_rows - vc->vc_y < new_rows) {
1214 /*
1215 * Cursor near the bottom, copy contents from the
1216 * bottom of buffer
1217 */
d8ae7242 1218 first_copied_row = (old_rows - new_rows);
3b41dc1a
AD		 1219 } else {
1220 /*
1221 * Cursor is in no man's land, copy 1/2 screenful
1222 * from the top and bottom of cursor position
1223 */
d8ae7242 1224 first_copied_row = (vc->vc_y - new_rows/2);
3b41dc1a 1225 }
d8ae7242
NP		 1226 old_origin += first_copied_row * old_row_size;
1227 } else
1228 first_copied_row = 0;
9fc2b2d0 1229 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4 1230
d8ae7242
NP		 1231 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1232 get_vc_uniscr(vc), rlth/2, first_copied_row,
1233 min(old_rows, new_rows));
1234 vc_uniscr_set(vc, new_uniscr);
1235
1da177e4
LT		 1236 update_attr(vc);
1237
3b41dc1a
AD		 1238 while (old_origin < end) {
1239 scr_memcpyw((unsigned short *) new_origin,
1240 (unsigned short *) old_origin, rlth);
1da177e4 1241 if (rrem)
3b41dc1a
AD		 1242 scr_memsetw((void *)(new_origin + rlth),
1243 vc->vc_video_erase_char, rrem);
1da177e4
LT		 1244 old_origin += old_row_size;
1245 new_origin += new_row_size;
1246 }
1247 if (new_scr_end > new_origin)
3b41dc1a
AD		 1248 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1249 new_scr_end - new_origin);
5c9228f0 1250 kfree(vc->vc_screenbuf);
1da177e4 1251 vc->vc_screenbuf = newscreen;
1da177e4
LT		 1252 vc->vc_screenbuf_size = new_screen_size;
1253 set_origin(vc);
1254
1255 /* do part of a reset_terminal() */
1256 vc->vc_top = 0;
1257 vc->vc_bottom = vc->vc_rows;
1258 gotoxy(vc, vc->vc_x, vc->vc_y);
1259 save_cur(vc);
1260
8c9a9dd0
AC		 1261 if (tty) {
1262 /* Rewrite the requested winsize data with the actual
1263 resulting sizes */
1264 struct winsize ws;
1da177e4
LT		 1265 memset(&ws, 0, sizeof(ws));
1266 ws.ws_row = vc->vc_rows;
1267 ws.ws_col = vc->vc_cols;
1268 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 1269 tty_do_resize(tty, &ws);
1da177e4
LT		 1270 }
1271
6ca8dfd7 1272 if (con_is_visible(vc))
1da177e4 1273 update_screen(vc);
8b92e87d 1274 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 1275 return err;
1276}
1277
8c9a9dd0
AC		 1278/**
1279 * vc_resize - resize a VT
1280 * @vc: virtual console
1281 * @cols: columns
1282 * @rows: rows
1283 *
1284 * Resize a virtual console as seen from the console end of things. We
1285 * use the common vc_do_resize methods to update the structures. The
1286 * caller must hold the console sem to protect console internals and
8ce73264 1287 * vc->port.tty
8c9a9dd0
AC		 1288 */
1289
1290int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1291{
8ce73264 1292 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 1293}
1294
1295/**
1296 * vt_resize - resize a VT
1297 * @tty: tty to resize
8c9a9dd0
AC		 1298 * @ws: winsize attributes
1299 *
1300 * Resize a virtual terminal. This is called by the tty layer as we
1301 * register our own handler for resizing. The mutual helper does all
1302 * the actual work.
1303 *
1304 * Takes the console sem and the called methods then take the tty
6a1c0680 1305 * termios_rwsem and the tty ctrl_lock in that order.
8c9a9dd0 1306 */
da2bdf9a 1307static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1308{
8c9a9dd0
AC		 1309 struct vc_data *vc = tty->driver_data;
1310 int ret;
ca9bda00 1311
ac751efa 1312 console_lock();
fc6f6238 1313 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1314 console_unlock();
8c9a9dd0 1315 return ret;
ca9bda00 1316}
1da177e4 1317
421b40a6 1318struct vc_data *vc_deallocate(unsigned int currcons)
1da177e4 1319{
421b40a6
PH		 1320 struct vc_data *vc = NULL;
1321
1da177e4
LT		 1322 WARN_CONSOLE_UNLOCKED();
1323
1324 if (vc_cons_allocated(currcons)) {
421b40a6 1325 struct vt_notifier_param param;
4995f8ef 1326
421b40a6 1327 param.vc = vc = vc_cons[currcons].d;
b293d758 1328 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1329 vcs_remove_sysfs(currcons);
1da177e4 1330 vc->vc_sw->con_deinit(vc);
bde0d2c9 1331 put_pid(vc->vt_pid);
d459ec0b 1332 module_put(vc->vc_sw->owner);
d8ae7242 1333 vc_uniscr_set(vc, NULL);
5c9228f0 1334 kfree(vc->vc_screenbuf);
1da177e4
LT		 1335 vc_cons[currcons].d = NULL;
1336 }
421b40a6 1337 return vc;
1da177e4
LT		 1338}
1339
1340/*
1341 * VT102 emulator
1342 */
1343
079c9534
AC		 1344#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1345#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1346#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1da177e4
LT		 1347
1348#define decarm VC_REPEAT
1349#define decckm VC_CKMODE
1350#define kbdapplic VC_APPLIC
1351#define lnm VC_CRLF
1352
1353/*
1354 * this is what the terminal answers to a ESC-Z or csi0c query.
1355 */
1356#define VT100ID "\033[?1;2c"
1357#define VT102ID "\033[?6c"
1358
8ede5cce 1359const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1da177e4
LT		 1360 8,12,10,14, 9,13,11,15 };
1361
1362/* the default colour table, for VGA+ colour systems */
91e74ca5
JS		 1363unsigned char default_red[] = {
1364 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1365 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1366};
1367module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1368
1369unsigned char default_grn[] = {
1370 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1371 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1372};
1373module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1374
1375unsigned char default_blu[] = {
1376 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1377 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1378};
1379module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1c2bbe6a 1380
1da177e4
LT		 1381/*
1382 * gotoxy() must verify all boundaries, because the arguments
1383 * might also be negative. If the given position is out of
1384 * bounds, the cursor is placed at the nearest margin.
1385 */
1386static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1387{
1388 int min_y, max_y;
1389
1390 if (new_x < 0)
1391 vc->vc_x = 0;
1392 else {
1393 if (new_x >= vc->vc_cols)
1394 vc->vc_x = vc->vc_cols - 1;
1395 else
1396 vc->vc_x = new_x;
1397 }
1398
1399 if (vc->vc_decom) {
1400 min_y = vc->vc_top;
1401 max_y = vc->vc_bottom;
1402 } else {
1403 min_y = 0;
1404 max_y = vc->vc_rows;
1405 }
1406 if (new_y < min_y)
1407 vc->vc_y = min_y;
1408 else if (new_y >= max_y)
1409 vc->vc_y = max_y - 1;
1410 else
1411 vc->vc_y = new_y;
1412 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1413 vc->vc_need_wrap = 0;
1414}
1415
1416/* for absolute user moves, when decom is set */
1417static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1418{
1419 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1420}
1421
1b0ec88a 1422void scrollback(struct vc_data *vc)
1da177e4 1423{
1b0ec88a 1424 scrolldelta(-(vc->vc_rows / 2));
1da177e4
LT		 1425}
1426
1427void scrollfront(struct vc_data *vc, int lines)
1428{
1429 if (!lines)
1430 lines = vc->vc_rows / 2;
1431 scrolldelta(lines);
1432}
1433
1434static void lf(struct vc_data *vc)
1435{
1436 /* don't scroll if above bottom of scrolling region, or
1437 * if below scrolling region
1438 */
1439 if (vc->vc_y + 1 == vc->vc_bottom)
89765b94 1440 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1da177e4
LT		 1441 else if (vc->vc_y < vc->vc_rows - 1) {
1442 vc->vc_y++;
1443 vc->vc_pos += vc->vc_size_row;
1444 }
1445 vc->vc_need_wrap = 0;
b293d758 1446 notify_write(vc, '\n');
1da177e4
LT		 1447}
1448
1449static void ri(struct vc_data *vc)
1450{
1451 /* don't scroll if below top of scrolling region, or
1452 * if above scrolling region
1453 */
1454 if (vc->vc_y == vc->vc_top)
89765b94 1455 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1da177e4
LT		 1456 else if (vc->vc_y > 0) {
1457 vc->vc_y--;
1458 vc->vc_pos -= vc->vc_size_row;
1459 }
1460 vc->vc_need_wrap = 0;
1461}
1462
1463static inline void cr(struct vc_data *vc)
1464{
1465 vc->vc_pos -= vc->vc_x << 1;
1466 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1467 notify_write(vc, '\r');
1da177e4
LT		 1468}
1469
1470static inline void bs(struct vc_data *vc)
1471{
1472 if (vc->vc_x) {
1473 vc->vc_pos -= 2;
1474 vc->vc_x--;
1475 vc->vc_need_wrap = 0;
b293d758 1476 notify_write(vc, '\b');
1da177e4
LT		 1477 }
1478}
1479
1480static inline void del(struct vc_data *vc)
1481{
1482 /* ignored */
1483}
1484
1485static void csi_J(struct vc_data *vc, int vpar)
1486{
1487 unsigned int count;
1488 unsigned short * start;
1489
1490 switch (vpar) {
1491 case 0: /* erase from cursor to end of display */
d8ae7242
NP		 1492 vc_uniscr_clear_line(vc, vc->vc_x,
1493 vc->vc_cols - vc->vc_x);
1494 vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1495 vc->vc_rows - vc->vc_y - 1);
1da177e4
LT		 1496 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1497 start = (unsigned short *)vc->vc_pos;
1da177e4
LT		 1498 break;
1499 case 1: /* erase from start to cursor */
d8ae7242
NP		 1500 vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1501 vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1da177e4
LT		 1502 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1503 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1504 break;
1505 case 2: /* erase whole display */
4b4ecd9c 1506 case 3: /* (and scrollback buffer later) */
d8ae7242 1507 vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1da177e4
LT		 1508 count = vc->vc_cols * vc->vc_rows;
1509 start = (unsigned short *)vc->vc_origin;
1da177e4
LT		 1510 break;
1511 default:
1512 return;
1513 }
1514 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
4b4ecd9c
NP		 1515 if (vpar == 3) {
1516 set_origin(vc);
1517 flush_scrollback(vc);
1518 if (con_is_visible(vc))
1519 update_screen(vc);
1520 } else if (con_should_update(vc))
81732c3b 1521 do_update_region(vc, (unsigned long) start, count);
1da177e4
LT		 1522 vc->vc_need_wrap = 0;
1523}
1524
1525static void csi_K(struct vc_data *vc, int vpar)
1526{
1527 unsigned int count;
d8ae7242
NP		 1528 unsigned short *start = (unsigned short *)vc->vc_pos;
1529 int offset;
1da177e4
LT		 1530
1531 switch (vpar) {
1532 case 0: /* erase from cursor to end of line */
d8ae7242 1533 offset = 0;
1da177e4 1534 count = vc->vc_cols - vc->vc_x;
1da177e4
LT		 1535 break;
1536 case 1: /* erase from start of line to cursor */
d8ae7242 1537 offset = -vc->vc_x;
1da177e4 1538 count = vc->vc_x + 1;
1da177e4
LT		 1539 break;
1540 case 2: /* erase whole line */
d8ae7242 1541 offset = -vc->vc_x;
1da177e4 1542 count = vc->vc_cols;
1da177e4
LT		 1543 break;
1544 default:
1545 return;
1546 }
d8ae7242
NP		 1547 vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1548 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1da177e4 1549 vc->vc_need_wrap = 0;
6ca8dfd7 1550 if (con_should_update(vc))
943210ba 1551 do_update_region(vc, (unsigned long)(start + offset), count);
1da177e4
LT		 1552}
1553
1554static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1555{ /* not vt100? */
1556 int count;
1557
1558 if (!vpar)
1559 vpar++;
1560 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1561
d8ae7242 1562 vc_uniscr_clear_line(vc, vc->vc_x, count);
1da177e4 1563 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
6ca8dfd7 1564 if (con_should_update(vc))
1da177e4
LT		 1565 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1566 vc->vc_need_wrap = 0;
1567}
1568
1569static void default_attr(struct vc_data *vc)
1570{
1571 vc->vc_intensity = 1;
fa6ce9ab 1572 vc->vc_italic = 0;
1da177e4
LT		 1573 vc->vc_underline = 0;
1574 vc->vc_reverse = 0;
1575 vc->vc_blink = 0;
1576 vc->vc_color = vc->vc_def_color;
1577}
1578
cec5b2a9
AB		 1579struct rgb { u8 r; u8 g; u8 b; };
1580
0f91e142 1581static void rgb_from_256(int i, struct rgb *c)
cec5b2a9 1582{
cec5b2a9 1583 if (i < 8) { /* Standard colours. */
0f91e142
JS		 1584 c->r = i&1 ? 0xaa : 0x00;
1585 c->g = i&2 ? 0xaa : 0x00;
1586 c->b = i&4 ? 0xaa : 0x00;
cec5b2a9 1587 } else if (i < 16) {
0f91e142
JS		 1588 c->r = i&1 ? 0xff : 0x55;
1589 c->g = i&2 ? 0xff : 0x55;
1590 c->b = i&4 ? 0xff : 0x55;
cec5b2a9 1591 } else if (i < 232) { /* 6x6x6 colour cube. */
0f91e142
JS		 1592 c->r = (i - 16) / 36 * 85 / 2;
1593 c->g = (i - 16) / 6 % 6 * 85 / 2;
1594 c->b = (i - 16) % 6 * 85 / 2;
cec5b2a9 1595 } else /* Grayscale ramp. */
0f91e142 1596 c->r = c->g = c->b = i * 10 - 2312;
cec5b2a9
AB		 1597}
1598
0f91e142 1599static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
cec5b2a9 1600{
193df022
JS		 1601 u8 hue = 0, max = max3(c->r, c->g, c->b);
1602
1603 if (c->r > max / 2)
1604 hue |= 4;
1605 if (c->g > max / 2)
1606 hue |= 2;
1607 if (c->b > max / 2)
1608 hue |= 1;
1609
1610 if (hue == 7 && max <= 0x55) {
1611 hue = 0;
1612 vc->vc_intensity = 2;
1613 } else if (max > 0xaa)
1614 vc->vc_intensity = 2;
cec5b2a9 1615 else
193df022
JS		 1616 vc->vc_intensity = 1;
1617
cec5b2a9
AB		 1618 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1619}
1620
0f91e142 1621static void rgb_background(struct vc_data *vc, const struct rgb *c)
cec5b2a9
AB		 1622{
1623 /* For backgrounds, err on the dark side. */
1624 vc->vc_color = (vc->vc_color & 0x0f)
0f91e142 1625 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
cec5b2a9
AB		 1626}
1627
e05ab238
JS		 1628/*
1629 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1630 * and thus need to be detected and ignored by hand. Strictly speaking, that
1631 * standard also wants : rather than ; as separators, contrary to ECMA-48, but
1632 * no one produces such codes and almost no one accepts them.
1633 *
1634 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1635 * supporting them.
1636 */
1637static int vc_t416_color(struct vc_data *vc, int i,
0f91e142 1638 void(*set_color)(struct vc_data *vc, const struct rgb *c))
e05ab238 1639{
0f91e142
JS		 1640 struct rgb c;
1641
e05ab238
JS		 1642 i++;
1643 if (i > vc->vc_npar)
1644 return i;
1645
0bf1f4a8 1646 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
3e7ec4a0 1647 /* 256 colours */
e05ab238 1648 i++;
0f91e142 1649 rgb_from_256(vc->vc_par[i], &c);
669e0a51 1650 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
3e7ec4a0 1651 /* 24 bit */
0f91e142
JS		 1652 c.r = vc->vc_par[i + 1];
1653 c.g = vc->vc_par[i + 2];
1654 c.b = vc->vc_par[i + 3];
e05ab238 1655 i += 3;
0f91e142
JS		 1656 } else
1657 return i;
1658
1659 set_color(vc, &c);
e05ab238
JS		 1660
1661 return i;
1662}
1663
ac751efa 1664/* console_lock is held */
1da177e4
LT		 1665static void csi_m(struct vc_data *vc)
1666{
1667 int i;
1668
1669 for (i = 0; i <= vc->vc_npar; i++)
1670 switch (vc->vc_par[i]) {
aada0a34
JS		 1671 case 0: /* all attributes off */
1672 default_attr(vc);
1673 break;
1674 case 1:
1675 vc->vc_intensity = 2;
1676 break;
1677 case 2:
1678 vc->vc_intensity = 0;
1679 break;
1680 case 3:
1681 vc->vc_italic = 1;
1682 break;
65d9982d
MF		 1683 case 21:
1684 /*
1685 * No console drivers support double underline, so
1686 * convert it to a single underline.
1687 */
aada0a34
JS		 1688 case 4:
1689 vc->vc_underline = 1;
1690 break;
1691 case 5:
1692 vc->vc_blink = 1;
1693 break;
1694 case 7:
1695 vc->vc_reverse = 1;
1696 break;
1697 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1698 * Select primary font, don't display control chars if
1699 * defined, don't set bit 8 on output.
1700 */
1701 vc->vc_translate = set_translate(vc->vc_charset == 0
1702 ? vc->vc_G0_charset
1703 : vc->vc_G1_charset, vc);
1704 vc->vc_disp_ctrl = 0;
1705 vc->vc_toggle_meta = 0;
1706 break;
1707 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1708 * Select first alternate font, lets chars < 32 be
1709 * displayed as ROM chars.
1710 */
1711 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1712 vc->vc_disp_ctrl = 1;
1713 vc->vc_toggle_meta = 0;
1714 break;
1715 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1716 * Select second alternate font, toggle high bit
1717 * before displaying as ROM char.
1718 */
1719 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1720 vc->vc_disp_ctrl = 1;
1721 vc->vc_toggle_meta = 1;
1722 break;
aada0a34
JS		 1723 case 22:
1724 vc->vc_intensity = 1;
1725 break;
1726 case 23:
1727 vc->vc_italic = 0;
1728 break;
1729 case 24:
1730 vc->vc_underline = 0;
1731 break;
1732 case 25:
1733 vc->vc_blink = 0;
1734 break;
1735 case 27:
1736 vc->vc_reverse = 0;
1737 break;
1738 case 38:
1739 i = vc_t416_color(vc, i, rgb_foreground);
1740 break;
1741 case 48:
1742 i = vc_t416_color(vc, i, rgb_background);
1743 break;
1744 case 39:
1745 vc->vc_color = (vc->vc_def_color & 0x0f) |
1746 (vc->vc_color & 0xf0);
1747 break;
1748 case 49:
1749 vc->vc_color = (vc->vc_def_color & 0xf0) |
1750 (vc->vc_color & 0x0f);
1751 break;
1752 default:
fadb4244
AB		 1753 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1754 if (vc->vc_par[i] < 100)
1755 vc->vc_intensity = 2;
cc67dc28
AB		 1756 vc->vc_par[i] -= 60;
1757 }
aada0a34
JS		 1758 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1759 vc->vc_color = color_table[vc->vc_par[i] - 30]
1760 | (vc->vc_color & 0xf0);
1761 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1762 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1763 | (vc->vc_color & 0x0f);
1764 break;
1da177e4
LT		 1765 }
1766 update_attr(vc);
1767}
1768
6732c8bb 1769static void respond_string(const char *p, struct tty_port *port)
1da177e4
LT		 1770{
1771 while (*p) {
6732c8bb 1772 tty_insert_flip_char(port, *p, 0);
1da177e4
LT		 1773 p++;
1774 }
6732c8bb 1775 tty_schedule_flip(port);
1da177e4
LT		 1776}
1777
1778static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1779{
1780 char buf[40];
1781
1782 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
6732c8bb 1783 respond_string(buf, tty->port);
1da177e4
LT		 1784}
1785
1786static inline void status_report(struct tty_struct *tty)
1787{
6732c8bb 1788 respond_string("\033[0n", tty->port); /* Terminal ok */
1da177e4
LT		 1789}
1790
6732c8bb 1791static inline void respond_ID(struct tty_struct *tty)
1da177e4 1792{
6732c8bb 1793 respond_string(VT102ID, tty->port);
1da177e4
LT		 1794}
1795
1796void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1797{
1798 char buf[8];
1799
1800 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1801 (char)('!' + mry));
6732c8bb 1802 respond_string(buf, tty->port);
1da177e4
LT		 1803}
1804
1805/* invoked via ioctl(TIOCLINUX) and through set_selection */
1806int mouse_reporting(void)
1807{
1808 return vc_cons[fg_console].d->vc_report_mouse;
1809}
1810
ac751efa 1811/* console_lock is held */
1da177e4
LT		 1812static void set_mode(struct vc_data *vc, int on_off)
1813{
1814 int i;
1815
1816 for (i = 0; i <= vc->vc_npar; i++)
1817 if (vc->vc_ques) {
1818 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1819 case 1: /* Cursor keys send ^[Ox/^[[x */
1820 if (on_off)
1821 set_kbd(vc, decckm);
1822 else
1823 clr_kbd(vc, decckm);
1824 break;
1825 case 3: /* 80/132 mode switch unimplemented */
1da177e4
LT		 1826#if 0
1827 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1828 /* this alone does not suffice; some user mode
1829 utility has to change the hardware regs */
1830#endif
1831 break;
1832 case 5: /* Inverted screen on/off */
1833 if (vc->vc_decscnm != on_off) {
1834 vc->vc_decscnm = on_off;
1835 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1836 update_attr(vc);
1837 }
1838 break;
1839 case 6: /* Origin relative/absolute */
1840 vc->vc_decom = on_off;
1841 gotoxay(vc, 0, 0);
1842 break;
1843 case 7: /* Autowrap on/off */
1844 vc->vc_decawm = on_off;
1845 break;
1846 case 8: /* Autorepeat on/off */
1847 if (on_off)
1848 set_kbd(vc, decarm);
1849 else
1850 clr_kbd(vc, decarm);
1851 break;
1852 case 9:
1853 vc->vc_report_mouse = on_off ? 1 : 0;
1854 break;
1855 case 25: /* Cursor on/off */
1856 vc->vc_deccm = on_off;
1857 break;
1858 case 1000:
1859 vc->vc_report_mouse = on_off ? 2 : 0;
1860 break;
1861 }
1862 } else {
1863 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1864 case 3: /* Monitor (display ctrls) */
1865 vc->vc_disp_ctrl = on_off;
1866 break;
1867 case 4: /* Insert Mode on/off */
1868 vc->vc_decim = on_off;
1869 break;
1870 case 20: /* Lf, Enter == CrLf/Lf */
1871 if (on_off)
1872 set_kbd(vc, lnm);
1873 else
1874 clr_kbd(vc, lnm);
1875 break;
1876 }
1877 }
1878}
1879
ac751efa 1880/* console_lock is held */
1da177e4
LT		 1881static void setterm_command(struct vc_data *vc)
1882{
1883 switch(vc->vc_par[0]) {
1884 case 1: /* set color for underline mode */
1885 if (vc->vc_can_do_color &&
1886 vc->vc_par[1] < 16) {
1887 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1888 if (vc->vc_underline)
1889 update_attr(vc);
1890 }
1891 break;
1892 case 2: /* set color for half intensity mode */
1893 if (vc->vc_can_do_color &&
1894 vc->vc_par[1] < 16) {
1895 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1896 if (vc->vc_intensity == 0)
1897 update_attr(vc);
1898 }
1899 break;
1900 case 8: /* store colors as defaults */
1901 vc->vc_def_color = vc->vc_attr;
1902 if (vc->vc_hi_font_mask == 0x100)
1903 vc->vc_def_color >>= 1;
1904 default_attr(vc);
1905 update_attr(vc);
1906 break;
1907 case 9: /* set blanking interval */
f324edc8 1908 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1909 poke_blanked_console();
1910 break;
1911 case 10: /* set bell frequency in Hz */
1912 if (vc->vc_npar >= 1)
1913 vc->vc_bell_pitch = vc->vc_par[1];
1914 else
1915 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1916 break;
1917 case 11: /* set bell duration in msec */
1918 if (vc->vc_npar >= 1)
1919 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
3372ec28 1920 msecs_to_jiffies(vc->vc_par[1]) : 0;
1da177e4
LT		 1921 else
1922 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1923 break;
1924 case 12: /* bring specified console to the front */
1925 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1926 set_console(vc->vc_par[1] - 1);
1927 break;
1928 case 13: /* unblank the screen */
1929 poke_blanked_console();
1930 break;
1931 case 14: /* set vesa powerdown interval */
1932 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1933 break;
1934 case 15: /* activate the previous console */
1935 set_console(last_console);
1936 break;
bd63364c
SD		 1937 case 16: /* set cursor blink duration in msec */
1938 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1939 vc->vc_par[1] <= USHRT_MAX)
1940 vc->vc_cur_blink_ms = vc->vc_par[1];
1941 else
1942 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1943 break;
1da177e4
LT		 1944 }
1945}
1946
ac751efa 1947/* console_lock is held */
1da177e4
LT		 1948static void csi_at(struct vc_data *vc, unsigned int nr)
1949{
1950 if (nr > vc->vc_cols - vc->vc_x)
1951 nr = vc->vc_cols - vc->vc_x;
1952 else if (!nr)
1953 nr = 1;
1954 insert_char(vc, nr);
1955}
1956
ac751efa 1957/* console_lock is held */
1da177e4
LT		 1958static void csi_L(struct vc_data *vc, unsigned int nr)
1959{
1960 if (nr > vc->vc_rows - vc->vc_y)
1961 nr = vc->vc_rows - vc->vc_y;
1962 else if (!nr)
1963 nr = 1;
89765b94 1964 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
1da177e4
LT		 1965 vc->vc_need_wrap = 0;
1966}
1967
ac751efa 1968/* console_lock is held */
1da177e4
LT		 1969static void csi_P(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 delete_char(vc, nr);
1976}
1977
ac751efa 1978/* console_lock is held */
1da177e4
LT		 1979static void csi_M(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_UP, nr);
1da177e4
LT		 1986 vc->vc_need_wrap = 0;
1987}
1988
ac751efa 1989/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1990static void save_cur(struct vc_data *vc)
1991{
1992 vc->vc_saved_x = vc->vc_x;
1993 vc->vc_saved_y = vc->vc_y;
1994 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1995 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1996 vc->vc_s_underline = vc->vc_underline;
1997 vc->vc_s_blink = vc->vc_blink;
1998 vc->vc_s_reverse = vc->vc_reverse;
1999 vc->vc_s_charset = vc->vc_charset;
2000 vc->vc_s_color = vc->vc_color;
2001 vc->vc_saved_G0 = vc->vc_G0_charset;
2002 vc->vc_saved_G1 = vc->vc_G1_charset;
2003}
2004
ac751efa 2005/* console_lock is held */
1da177e4
LT		 2006static void restore_cur(struct vc_data *vc)
2007{
2008 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2009 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 2010 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 2011 vc->vc_underline = vc->vc_s_underline;
2012 vc->vc_blink = vc->vc_s_blink;
2013 vc->vc_reverse = vc->vc_s_reverse;
2014 vc->vc_charset = vc->vc_s_charset;
2015 vc->vc_color = vc->vc_s_color;
2016 vc->vc_G0_charset = vc->vc_saved_G0;
2017 vc->vc_G1_charset = vc->vc_saved_G1;
2018 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2019 update_attr(vc);
2020 vc->vc_need_wrap = 0;
2021}
2022
b290af68 2023enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1da177e4 2024 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
63f3a16d 2025 ESpalette, ESosc };
1da177e4 2026
ac751efa 2027/* console_lock is held (except via vc_init()) */
1da177e4
LT		 2028static void reset_terminal(struct vc_data *vc, int do_clear)
2029{
2030 vc->vc_top = 0;
2031 vc->vc_bottom = vc->vc_rows;
2032 vc->vc_state = ESnormal;
2033 vc->vc_ques = 0;
2034 vc->vc_translate = set_translate(LAT1_MAP, vc);
2035 vc->vc_G0_charset = LAT1_MAP;
2036 vc->vc_G1_charset = GRAF_MAP;
2037 vc->vc_charset = 0;
2038 vc->vc_need_wrap = 0;
2039 vc->vc_report_mouse = 0;
042f10ec 2040 vc->vc_utf = default_utf8;
1da177e4
LT		 2041 vc->vc_utf_count = 0;
2042
2043 vc->vc_disp_ctrl = 0;
2044 vc->vc_toggle_meta = 0;
2045
2046 vc->vc_decscnm = 0;
2047 vc->vc_decom = 0;
2048 vc->vc_decawm = 1;
f6c06b68 2049 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 2050 vc->vc_decim = 0;
2051
079c9534 2052 vt_reset_keyboard(vc->vc_num);
1da177e4 2053
9ea9a886 2054 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2055 vc->vc_complement_mask = vc->vc_s_complement_mask;
2056
2057 default_attr(vc);
2058 update_attr(vc);
2059
f1869a89 2060 vc->vc_tab_stop[0] =
1da177e4
LT		 2061 vc->vc_tab_stop[1] =
2062 vc->vc_tab_stop[2] =
2063 vc->vc_tab_stop[3] =
a564738c
WK		 2064 vc->vc_tab_stop[4] =
2065 vc->vc_tab_stop[5] =
2066 vc->vc_tab_stop[6] =
2067 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 2068
2069 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2070 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
bd63364c 2071 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1da177e4
LT		 2072
2073 gotoxy(vc, 0, 0);
2074 save_cur(vc);
2075 if (do_clear)
2076 csi_J(vc, 2);
2077}
2078
ac751efa 2079/* console_lock is held */
1da177e4
LT		 2080static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2081{
2082 /*
2083 * Control characters can be used in the _middle_
2084 * of an escape sequence.
2085 */
63f3a16d
AB		 2086 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2087 return;
1da177e4
LT		 2088 switch (c) {
2089 case 0:
2090 return;
2091 case 7:
63f3a16d
AB		 2092 if (vc->vc_state == ESosc)
2093 vc->vc_state = ESnormal;
2094 else if (vc->vc_bell_duration)
1da177e4
LT		 2095 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2096 return;
2097 case 8:
2098 bs(vc);
2099 return;
2100 case 9:
2101 vc->vc_pos -= (vc->vc_x << 1);
2102 while (vc->vc_x < vc->vc_cols - 1) {
2103 vc->vc_x++;
f1869a89 2104 if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
1da177e4
LT		 2105 break;
2106 }
2107 vc->vc_pos += (vc->vc_x << 1);
b293d758 2108 notify_write(vc, '\t');
1da177e4
LT		 2109 return;
2110 case 10: case 11: case 12:
2111 lf(vc);
2112 if (!is_kbd(vc, lnm))
2113 return;
2114 case 13:
2115 cr(vc);
2116 return;
2117 case 14:
2118 vc->vc_charset = 1;
2119 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2120 vc->vc_disp_ctrl = 1;
2121 return;
2122 case 15:
2123 vc->vc_charset = 0;
2124 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2125 vc->vc_disp_ctrl = 0;
2126 return;
2127 case 24: case 26:
2128 vc->vc_state = ESnormal;
2129 return;
2130 case 27:
2131 vc->vc_state = ESesc;
2132 return;
2133 case 127:
2134 del(vc);
2135 return;
2136 case 128+27:
2137 vc->vc_state = ESsquare;
2138 return;
2139 }
2140 switch(vc->vc_state) {
2141 case ESesc:
2142 vc->vc_state = ESnormal;
2143 switch (c) {
2144 case '[':
2145 vc->vc_state = ESsquare;
2146 return;
2147 case ']':
2148 vc->vc_state = ESnonstd;
2149 return;
2150 case '%':
2151 vc->vc_state = ESpercent;
2152 return;
2153 case 'E':
2154 cr(vc);
2155 lf(vc);
2156 return;
2157 case 'M':
2158 ri(vc);
2159 return;
2160 case 'D':
2161 lf(vc);
2162 return;
2163 case 'H':
f1869a89 2164 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
1da177e4
LT		 2165 return;
2166 case 'Z':
2167 respond_ID(tty);
2168 return;
2169 case '7':
2170 save_cur(vc);
2171 return;
2172 case '8':
2173 restore_cur(vc);
2174 return;
2175 case '(':
2176 vc->vc_state = ESsetG0;
2177 return;
2178 case ')':
2179 vc->vc_state = ESsetG1;
2180 return;
2181 case '#':
2182 vc->vc_state = EShash;
2183 return;
2184 case 'c':
2185 reset_terminal(vc, 1);
2186 return;
2187 case '>': /* Numeric keypad */
2188 clr_kbd(vc, kbdapplic);
2189 return;
2190 case '=': /* Appl. keypad */
2191 set_kbd(vc, kbdapplic);
2192 return;
2193 }
2194 return;
2195 case ESnonstd:
2196 if (c=='P') { /* palette escape sequence */
2197 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2198 vc->vc_par[vc->vc_npar] = 0;
2199 vc->vc_npar = 0;
2200 vc->vc_state = ESpalette;
2201 return;
2202 } else if (c=='R') { /* reset palette */
2203 reset_palette(vc);
2204 vc->vc_state = ESnormal;
63f3a16d
AB		 2205 } else if (c>='0' && c<='9')
2206 vc->vc_state = ESosc;
2207 else
1da177e4
LT		 2208 vc->vc_state = ESnormal;
2209 return;
2210 case ESpalette:
74c807ce
AS		 2211 if (isxdigit(c)) {
2212 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 2213 if (vc->vc_npar == 7) {
2214 int i = vc->vc_par[0] * 3, j = 1;
2215 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2216 vc->vc_palette[i++] += vc->vc_par[j++];
2217 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2218 vc->vc_palette[i++] += vc->vc_par[j++];
2219 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2220 vc->vc_palette[i] += vc->vc_par[j];
2221 set_palette(vc);
2222 vc->vc_state = ESnormal;
2223 }
2224 } else
2225 vc->vc_state = ESnormal;
2226 return;
2227 case ESsquare:
2228 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2229 vc->vc_par[vc->vc_npar] = 0;
2230 vc->vc_npar = 0;
2231 vc->vc_state = ESgetpars;
2232 if (c == '[') { /* Function key */
2233 vc->vc_state=ESfunckey;
2234 return;
2235 }
2236 vc->vc_ques = (c == '?');
2237 if (vc->vc_ques)
2238 return;
2239 case ESgetpars:
2240 if (c == ';' && vc->vc_npar < NPAR - 1) {
2241 vc->vc_npar++;
2242 return;
2243 } else if (c>='0' && c<='9') {
2244 vc->vc_par[vc->vc_npar] *= 10;
2245 vc->vc_par[vc->vc_npar] += c - '0';
2246 return;
b290af68 2247 }
1da177e4
LT		 2248 vc->vc_state = ESnormal;
2249 switch(c) {
2250 case 'h':
2251 set_mode(vc, 1);
2252 return;
2253 case 'l':
2254 set_mode(vc, 0);
2255 return;
2256 case 'c':
2257 if (vc->vc_ques) {
2258 if (vc->vc_par[0])
2259 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2260 else
9ea9a886 2261 vc->vc_cursor_type = cur_default;
1da177e4
LT		 2262 return;
2263 }
2264 break;
2265 case 'm':
2266 if (vc->vc_ques) {
2267 clear_selection();
2268 if (vc->vc_par[0])
2269 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2270 else
2271 vc->vc_complement_mask = vc->vc_s_complement_mask;
2272 return;
2273 }
2274 break;
2275 case 'n':
2276 if (!vc->vc_ques) {
2277 if (vc->vc_par[0] == 5)
2278 status_report(tty);
2279 else if (vc->vc_par[0] == 6)
2280 cursor_report(vc, tty);
2281 }
2282 return;
2283 }
2284 if (vc->vc_ques) {
2285 vc->vc_ques = 0;
2286 return;
2287 }
2288 switch(c) {
2289 case 'G': case '`':
2290 if (vc->vc_par[0])
2291 vc->vc_par[0]--;
2292 gotoxy(vc, vc->vc_par[0], vc->vc_y);
2293 return;
2294 case 'A':
2295 if (!vc->vc_par[0])
2296 vc->vc_par[0]++;
2297 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2298 return;
2299 case 'B': case 'e':
2300 if (!vc->vc_par[0])
2301 vc->vc_par[0]++;
2302 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2303 return;
2304 case 'C': case 'a':
2305 if (!vc->vc_par[0])
2306 vc->vc_par[0]++;
2307 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2308 return;
2309 case 'D':
2310 if (!vc->vc_par[0])
2311 vc->vc_par[0]++;
2312 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2313 return;
2314 case 'E':
2315 if (!vc->vc_par[0])
2316 vc->vc_par[0]++;
2317 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2318 return;
2319 case 'F':
2320 if (!vc->vc_par[0])
2321 vc->vc_par[0]++;
2322 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2323 return;
2324 case 'd':
2325 if (vc->vc_par[0])
2326 vc->vc_par[0]--;
2327 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2328 return;
2329 case 'H': case 'f':
2330 if (vc->vc_par[0])
2331 vc->vc_par[0]--;
2332 if (vc->vc_par[1])
2333 vc->vc_par[1]--;
2334 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2335 return;
2336 case 'J':
2337 csi_J(vc, vc->vc_par[0]);
2338 return;
2339 case 'K':
2340 csi_K(vc, vc->vc_par[0]);
2341 return;
2342 case 'L':
2343 csi_L(vc, vc->vc_par[0]);
2344 return;
2345 case 'M':
2346 csi_M(vc, vc->vc_par[0]);
2347 return;
2348 case 'P':
2349 csi_P(vc, vc->vc_par[0]);
2350 return;
2351 case 'c':
2352 if (!vc->vc_par[0])
2353 respond_ID(tty);
2354 return;
2355 case 'g':
2356 if (!vc->vc_par[0])
f1869a89 2357 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
1da177e4
LT		 2358 else if (vc->vc_par[0] == 3) {
2359 vc->vc_tab_stop[0] =
2360 vc->vc_tab_stop[1] =
2361 vc->vc_tab_stop[2] =
2362 vc->vc_tab_stop[3] =
a564738c
WK		 2363 vc->vc_tab_stop[4] =
2364 vc->vc_tab_stop[5] =
2365 vc->vc_tab_stop[6] =
2366 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 2367 }
2368 return;
2369 case 'm':
2370 csi_m(vc);
2371 return;
2372 case 'q': /* DECLL - but only 3 leds */
2373 /* map 0,1,2,3 to 0,1,2,4 */
2374 if (vc->vc_par[0] < 4)
079c9534 2375 vt_set_led_state(vc->vc_num,
1da177e4
LT		 2376 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2377 return;
2378 case 'r':
2379 if (!vc->vc_par[0])
2380 vc->vc_par[0]++;
2381 if (!vc->vc_par[1])
2382 vc->vc_par[1] = vc->vc_rows;
2383 /* Minimum allowed region is 2 lines */
2384 if (vc->vc_par[0] < vc->vc_par[1] &&
2385 vc->vc_par[1] <= vc->vc_rows) {
2386 vc->vc_top = vc->vc_par[0] - 1;
2387 vc->vc_bottom = vc->vc_par[1];
2388 gotoxay(vc, 0, 0);
2389 }
2390 return;
2391 case 's':
2392 save_cur(vc);
2393 return;
2394 case 'u':
2395 restore_cur(vc);
2396 return;
2397 case 'X':
2398 csi_X(vc, vc->vc_par[0]);
2399 return;
2400 case '@':
2401 csi_at(vc, vc->vc_par[0]);
2402 return;
2403 case ']': /* setterm functions */
2404 setterm_command(vc);
2405 return;
2406 }
2407 return;
2408 case ESpercent:
2409 vc->vc_state = ESnormal;
2410 switch (c) {
2411 case '@': /* defined in ISO 2022 */
2412 vc->vc_utf = 0;
2413 return;
2414 case 'G': /* prelim official escape code */
2415 case '8': /* retained for compatibility */
2416 vc->vc_utf = 1;
2417 return;
2418 }
2419 return;
2420 case ESfunckey:
2421 vc->vc_state = ESnormal;
2422 return;
2423 case EShash:
2424 vc->vc_state = ESnormal;
2425 if (c == '8') {
2426 /* DEC screen alignment test. kludge :-) */
2427 vc->vc_video_erase_char =
2428 (vc->vc_video_erase_char & 0xff00) | 'E';
2429 csi_J(vc, 2);
2430 vc->vc_video_erase_char =
2431 (vc->vc_video_erase_char & 0xff00) | ' ';
2432 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2433 }
2434 return;
2435 case ESsetG0:
2436 if (c == '0')
2437 vc->vc_G0_charset = GRAF_MAP;
2438 else if (c == 'B')
2439 vc->vc_G0_charset = LAT1_MAP;
2440 else if (c == 'U')
2441 vc->vc_G0_charset = IBMPC_MAP;
2442 else if (c == 'K')
2443 vc->vc_G0_charset = USER_MAP;
2444 if (vc->vc_charset == 0)
2445 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2446 vc->vc_state = ESnormal;
2447 return;
2448 case ESsetG1:
2449 if (c == '0')
2450 vc->vc_G1_charset = GRAF_MAP;
2451 else if (c == 'B')
2452 vc->vc_G1_charset = LAT1_MAP;
2453 else if (c == 'U')
2454 vc->vc_G1_charset = IBMPC_MAP;
2455 else if (c == 'K')
2456 vc->vc_G1_charset = USER_MAP;
2457 if (vc->vc_charset == 1)
2458 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2459 vc->vc_state = ESnormal;
2460 return;
63f3a16d
AB		 2461 case ESosc:
2462 return;
1da177e4
LT		 2463 default:
2464 vc->vc_state = ESnormal;
2465 }
2466}
2467
2f1a2ccb 2468/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2469 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2470 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2471 */
2472struct interval {
2473 uint32_t first;
2474 uint32_t last;
2475};
2476
f0a8d84f 2477static int ucs_cmp(const void *key, const void *elt)
2f1a2ccb 2478{
f0a8d84f
TM		 2479 uint32_t ucs = *(uint32_t *)key;
2480 struct interval e = *(struct interval *) elt;
2f1a2ccb 2481
f0a8d84f
TM		 2482 if (ucs > e.last)
2483 return 1;
2484 else if (ucs < e.first)
2485 return -1;
2f1a2ccb
EK		 2486 return 0;
2487}
2488
2489static int is_double_width(uint32_t ucs)
2490{
2491 static const struct interval double_width[] = {
2492 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2493 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2494 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2495 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2496 };
f0a8d84f
TM		 2497 if (ucs < double_width[0].first ||
2498 ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2499 return 0;
2500
2501 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2502 sizeof(struct interval), ucs_cmp) != NULL;
2f1a2ccb
EK		 2503}
2504
d711ea8f
JS		 2505static void con_flush(struct vc_data *vc, unsigned long draw_from,
2506 unsigned long draw_to, int *draw_x)
2507{
2508 if (*draw_x < 0)
2509 return;
2510
2511 vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2512 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2513 *draw_x = -1;
2514}
2515
ac751efa 2516/* acquires console_lock */
1da177e4
LT		 2517static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2518{
d8ae7242 2519 int c, next_c, tc, ok, n = 0, draw_x = -1;
1da177e4
LT		 2520 unsigned int currcons;
2521 unsigned long draw_from = 0, draw_to = 0;
2522 struct vc_data *vc;
2f1a2ccb 2523 unsigned char vc_attr;
0341a4d0 2524 struct vt_notifier_param param;
2f1a2ccb
EK		 2525 uint8_t rescan;
2526 uint8_t inverse;
2527 uint8_t width;
1da177e4 2528 u16 himask, charmask;
1da177e4
LT		 2529
2530 if (in_interrupt())
2531 return count;
2532
2533 might_sleep();
2534
ac751efa 2535 console_lock();
1da177e4
LT		 2536 vc = tty->driver_data;
2537 if (vc == NULL) {
bccf1da3 2538 pr_err("vt: argh, driver_data is NULL !\n");
ac751efa 2539 console_unlock();
1da177e4
LT		 2540 return 0;
2541 }
2542
2543 currcons = vc->vc_num;
2544 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2545 /* could this happen? */
2546 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2547 console_unlock();
2548 return 0;
1da177e4 2549 }
1da177e4 2550
1da177e4
LT		 2551 himask = vc->vc_hi_font_mask;
2552 charmask = himask ? 0x1ff : 0xff;
2553
2554 /* undraw cursor first */
6ca8dfd7 2555 if (con_is_fg(vc))
1da177e4
LT		 2556 hide_cursor(vc);
2557
0341a4d0
KD		 2558 param.vc = vc;
2559
1da177e4
LT		 2560 while (!tty->stopped && count) {
2561 int orig = *buf;
2562 c = orig;
2563 buf++;
2564 n++;
2565 count--;
2f1a2ccb
EK		 2566 rescan = 0;
2567 inverse = 0;
2568 width = 1;
1da177e4
LT		 2569
2570 /* Do no translation at all in control states */
2571 if (vc->vc_state != ESnormal) {
2572 tc = c;
d4328b40 2573 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2574 /* Combine UTF-8 into Unicode in vc_utf_char.
2575 * vc_utf_count is the number of continuation bytes still
2576 * expected to arrive.
2577 * vc_npar is the number of continuation bytes arrived so
2578 * far
2579 */
d4328b40 2580rescan_last_byte:
2f1a2ccb
EK		 2581 if ((c & 0xc0) == 0x80) {
2582 /* Continuation byte received */
2583 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2584 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2585 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2586 vc->vc_npar++;
2587 if (--vc->vc_utf_count) {
2588 /* Still need some bytes */
1da177e4 2589 continue;
2f1a2ccb
EK		 2590 }
2591 /* Got a whole character */
2592 c = vc->vc_utf_char;
2593 /* Reject overlong sequences */
2594 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2595 c > utf8_length_changes[vc->vc_npar])
2596 c = 0xfffd;
2597 } else {
2598 /* Unexpected continuation byte */
2599 vc->vc_utf_count = 0;
2600 c = 0xfffd;
2601 }
1da177e4 2602 } else {
2f1a2ccb
EK		 2603 /* Single ASCII byte or first byte of a sequence received */
2604 if (vc->vc_utf_count) {
2605 /* Continuation byte expected */
2606 rescan = 1;
2607 vc->vc_utf_count = 0;
2608 c = 0xfffd;
2609 } else if (c > 0x7f) {
2610 /* First byte of a multibyte sequence received */
2611 vc->vc_npar = 0;
2612 if ((c & 0xe0) == 0xc0) {
2613 vc->vc_utf_count = 1;
2614 vc->vc_utf_char = (c & 0x1f);
2615 } else if ((c & 0xf0) == 0xe0) {
2616 vc->vc_utf_count = 2;
2617 vc->vc_utf_char = (c & 0x0f);
2618 } else if ((c & 0xf8) == 0xf0) {
2619 vc->vc_utf_count = 3;
2620 vc->vc_utf_char = (c & 0x07);
2621 } else if ((c & 0xfc) == 0xf8) {
2622 vc->vc_utf_count = 4;
2623 vc->vc_utf_char = (c & 0x03);
2624 } else if ((c & 0xfe) == 0xfc) {
2625 vc->vc_utf_count = 5;
2626 vc->vc_utf_char = (c & 0x01);
2627 } else {
2628 /* 254 and 255 are invalid */
2629 c = 0xfffd;
2630 }
2631 if (vc->vc_utf_count) {
2632 /* Still need some bytes */
2633 continue;
2634 }
2635 }
2636 /* Nothing to do if an ASCII byte was received */
1da177e4 2637 }
2f1a2ccb
EK		 2638 /* End of UTF-8 decoding. */
2639 /* c is the received character, or U+FFFD for invalid sequences. */
2640 /* Replace invalid Unicode code points with U+FFFD too */
2641 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2642 c = 0xfffd;
2643 tc = c;
d4328b40 2644 } else { /* no utf or alternate charset mode */
a29ccf6f 2645 tc = vc_translate(vc, c);
1da177e4
LT		 2646 }
2647
0341a4d0
KD		 2648 param.c = tc;
2649 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2650 &param) == NOTIFY_STOP)
2651 continue;
2652
1da177e4
LT		 2653 /* If the original code was a control character we
2654 * only allow a glyph to be displayed if the code is
2655 * not normally used (such as for cursor movement) or
2656 * if the disp_ctrl mode has been explicitly enabled.
2657 * Certain characters (as given by the CTRL_ALWAYS
2658 * bitmap) are always displayed as control characters,
2659 * as the console would be pretty useless without
2660 * them; to display an arbitrary font position use the
2661 * direct-to-font zone in UTF-8 mode.
2662 */
2663 ok = tc && (c >= 32 ||
d4328b40
AT		 2664 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2665 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2666 && (c != 127 || vc->vc_disp_ctrl)
2667 && (c != 128+27);
2668
2669 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2670 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2671 if (is_double_width(c))
2672 width = 2;
2673 }
1da177e4
LT		 2674 /* Now try to find out how to display it */
2675 tc = conv_uni_to_pc(vc, tc);
d4328b40 2676 if (tc & ~charmask) {
2f1a2ccb
EK		 2677 if (tc == -1 || tc == -2) {
2678 continue; /* nothing to display */
2679 }
2680 /* Glyph not found */
c0b79882 2681 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2682 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2683 This would make absolutely no sense with Unicode in mind,
2684 but do this for ASCII characters since a font may lack
2685 Unicode mapping info and we don't want to end up with
2686 having question marks only. */
2f1a2ccb
EK		 2687 tc = c;
2688 } else {
2689 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2690 tc = conv_uni_to_pc(vc, 0xfffd);
2691 if (tc < 0) {
2692 inverse = 1;
2693 tc = conv_uni_to_pc(vc, '?');
2694 if (tc < 0) tc = '?';
2695 }
2696 }
d4328b40 2697 }
1da177e4 2698
2f1a2ccb
EK		 2699 if (!inverse) {
2700 vc_attr = vc->vc_attr;
1da177e4 2701 } else {
2f1a2ccb
EK		 2702 /* invert vc_attr */
2703 if (!vc->vc_can_do_color) {
2704 vc_attr = (vc->vc_attr) ^ 0x08;
2705 } else if (vc->vc_hi_font_mask == 0x100) {
2706 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2707 } else {
2708 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2709 }
d711ea8f 2710 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4 2711 }
2f1a2ccb 2712
d8ae7242 2713 next_c = c;
2f1a2ccb
EK		 2714 while (1) {
2715 if (vc->vc_need_wrap || vc->vc_decim)
d711ea8f
JS		 2716 con_flush(vc, draw_from, draw_to,
2717 &draw_x);
2f1a2ccb
EK		 2718 if (vc->vc_need_wrap) {
2719 cr(vc);
2720 lf(vc);
2721 }
2722 if (vc->vc_decim)
2723 insert_char(vc, 1);
d8ae7242 2724 vc_uniscr_putc(vc, next_c);
2f1a2ccb
EK		 2725 scr_writew(himask ?
2726 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2727 (vc_attr << 8) + tc,
2728 (u16 *) vc->vc_pos);
6ca8dfd7 2729 if (con_should_update(vc) && draw_x < 0) {
2f1a2ccb
EK		 2730 draw_x = vc->vc_x;
2731 draw_from = vc->vc_pos;
2732 }
2733 if (vc->vc_x == vc->vc_cols - 1) {
2734 vc->vc_need_wrap = vc->vc_decawm;
2735 draw_to = vc->vc_pos + 2;
2736 } else {
2737 vc->vc_x++;
2738 draw_to = (vc->vc_pos += 2);
d4328b40 2739 }
2f1a2ccb
EK		 2740
2741 if (!--width) break;
2742
2743 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2744 if (tc < 0) tc = ' ';
d8ae7242 2745 next_c = ' ';
2f1a2ccb 2746 }
b293d758 2747 notify_write(vc, c);
2f1a2ccb 2748
d711ea8f
JS		 2749 if (inverse)
2750 con_flush(vc, draw_from, draw_to, &draw_x);
1ed8a2b3 2751
2f1a2ccb
EK		 2752 if (rescan) {
2753 rescan = 0;
2754 inverse = 0;
2755 width = 1;
d4328b40
AT		 2756 c = orig;
2757 goto rescan_last_byte;
2758 }
1da177e4
LT		 2759 continue;
2760 }
d711ea8f 2761 con_flush(vc, draw_from, draw_to, &draw_x);
1da177e4
LT		 2762 do_con_trol(tty, vc, orig);
2763 }
d711ea8f 2764 con_flush(vc, draw_from, draw_to, &draw_x);
0224080f 2765 vc_uniscr_debug_check(vc);
1da177e4 2766 console_conditional_schedule();
ac751efa 2767 console_unlock();
b293d758 2768 notify_update(vc);
1da177e4 2769 return n;
1da177e4
LT		 2770}
2771
2772/*
2773 * This is the console switching callback.
2774 *
2775 * Doing console switching in a process context allows
2776 * us to do the switches asynchronously (needed when we want
2777 * to switch due to a keyboard interrupt). Synchronization
2778 * with other console code and prevention of re-entrancy is
ac751efa 2779 * ensured with console_lock.
1da177e4 2780 */
65f27f38 2781static void console_callback(struct work_struct *ignored)
1da177e4 2782{
ac751efa 2783 console_lock();
1da177e4
LT		 2784
2785 if (want_console >= 0) {
2786 if (want_console != fg_console &&
2787 vc_cons_allocated(want_console)) {
2788 hide_cursor(vc_cons[fg_console].d);
2789 change_console(vc_cons[want_console].d);
2790 /* we only changed when the console had already
2791 been allocated - a new console is not created
2792 in an interrupt routine */
2793 }
2794 want_console = -1;
2795 }
2796 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2797 do_poke_blanked_console = 0;
2798 poke_blanked_console();
2799 }
2800 if (scrollback_delta) {
2801 struct vc_data *vc = vc_cons[fg_console].d;
2802 clear_selection();
97293de9 2803 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
1da177e4
LT		 2804 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2805 scrollback_delta = 0;
2806 }
2807 if (blank_timer_expired) {
2808 do_blank_screen(0);
2809 blank_timer_expired = 0;
2810 }
b293d758 2811 notify_update(vc_cons[fg_console].d);
1da177e4 2812
ac751efa 2813 console_unlock();
1da177e4
LT		 2814}
2815
b257bc05 2816int set_console(int nr)
1da177e4 2817{
b257bc05
AJ		 2818 struct vc_data *vc = vc_cons[fg_console].d;
2819
2820 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2821 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2822
2823 /*
2824 * Console switch will fail in console_callback() or
2825 * change_console() so there is no point scheduling
2826 * the callback
2827 *
2828 * Existing set_console() users don't check the return
2829 * value so this shouldn't break anything
2830 */
2831 return -EINVAL;
2832 }
2833
1da177e4
LT		 2834 want_console = nr;
2835 schedule_console_callback();
b257bc05
AJ		 2836
2837 return 0;
1da177e4
LT		 2838}
2839
2840struct tty_driver *console_driver;
2841
2842#ifdef CONFIG_VT_CONSOLE
2843
5ada918b
BW		 2844/**
2845 * vt_kmsg_redirect() - Sets/gets the kernel message console
2846 * @new: The new virtual terminal number or -1 if the console should stay
2847 * unchanged
2848 *
2849 * By default, the kernel messages are always printed on the current virtual
2850 * console. However, the user may modify that default with the
2851 * TIOCL_SETKMSGREDIRECT ioctl call.
2852 *
2853 * This function sets the kernel message console to be @new. It returns the old
2854 * virtual console number. The virtual terminal number 0 (both as parameter and
2855 * return value) means no redirection (i.e. always printed on the currently
2856 * active console).
2857 *
2858 * The parameter -1 means that only the current console is returned, but the
2859 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2860 * case to make the code more understandable.
2861 *
2862 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2863 * the parameter and always returns 0.
2864 */
2865int vt_kmsg_redirect(int new)
2866{
2867 static int kmsg_con;
2868
2869 if (new != -1)
2870 return xchg(&kmsg_con, new);
2871 else
2872 return kmsg_con;
2873}
2874
1da177e4
LT		 2875/*
2876 * Console on virtual terminal
2877 *
2878 * The console must be locked when we get here.
2879 */
2880
2881static void vt_console_print(struct console *co, const char *b, unsigned count)
2882{
2883 struct vc_data *vc = vc_cons[fg_console].d;
2884 unsigned char c;
b0940003 2885 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2886 const ushort *start;
2887 ushort cnt = 0;
2888 ushort myx;
5ada918b 2889 int kmsg_console;
1da177e4
LT		 2890
2891 /* console busy or not yet initialized */
b0940003
NP		 2892 if (!printable)
2893 return;
2894 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2895 return;
2896
5ada918b
BW		 2897 kmsg_console = vt_get_kmsg_redirect();
2898 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2899 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2900
2901 /* read `x' only after setting currcons properly (otherwise
2902 the `x' macro will read the x of the foreground console). */
2903 myx = vc->vc_x;
2904
2905 if (!vc_cons_allocated(fg_console)) {
2906 /* impossible */
2907 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2908 goto quit;
2909 }
2910
8d7fc299 2911 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 2912 goto quit;
2913
2914 /* undraw cursor first */
6ca8dfd7 2915 if (con_is_fg(vc))
1da177e4
LT		 2916 hide_cursor(vc);
2917
2918 start = (ushort *)vc->vc_pos;
2919
2920 /* Contrived structure to try to emulate original need_wrap behaviour
2921 * Problems caused when we have need_wrap set on '\n' character */
2922 while (count--) {
2923 c = *b++;
2924 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2925 if (cnt > 0) {
6ca8dfd7 2926 if (con_is_visible(vc))
1da177e4
LT		 2927 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2928 vc->vc_x += cnt;
2929 if (vc->vc_need_wrap)
2930 vc->vc_x--;
2931 cnt = 0;
2932 }
2933 if (c == 8) { /* backspace */
2934 bs(vc);
2935 start = (ushort *)vc->vc_pos;
2936 myx = vc->vc_x;
2937 continue;
2938 }
2939 if (c != 13)
2940 lf(vc);
2941 cr(vc);
2942 start = (ushort *)vc->vc_pos;
2943 myx = vc->vc_x;
2944 if (c == 10 || c == 13)
2945 continue;
2946 }
2947 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2948 notify_write(vc, c);
1da177e4
LT		 2949 cnt++;
2950 if (myx == vc->vc_cols - 1) {
2951 vc->vc_need_wrap = 1;
2952 continue;
2953 }
2954 vc->vc_pos += 2;
2955 myx++;
2956 }
2957 if (cnt > 0) {
6ca8dfd7 2958 if (con_is_visible(vc))
1da177e4
LT		 2959 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2960 vc->vc_x += cnt;
2961 if (vc->vc_x == vc->vc_cols) {
2962 vc->vc_x--;
2963 vc->vc_need_wrap = 1;
2964 }
2965 }
2966 set_cursor(vc);
b293d758 2967 notify_update(vc);
1da177e4
LT		 2968
2969quit:
b0940003 2970 spin_unlock(&printing_lock);
1da177e4
LT		 2971}
2972
2973static struct tty_driver *vt_console_device(struct console *c, int *index)
2974{
2975 *index = c->index ? c->index-1 : fg_console;
2976 return console_driver;
2977}
2978
2979static struct console vt_console_driver = {
2980 .name = "tty",
2981 .write = vt_console_print,
2982 .device = vt_console_device,
2983 .unblank = unblank_screen,
2984 .flags = CON_PRINTBUFFER,
2985 .index = -1,
2986};
2987#endif
2988
2989/*
2990 * Handling of Linux-specific VC ioctls
2991 */
2992
2993/*
ac751efa 2994 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2995 *
2996 * There are some functions which don't need it.
2997 *
2998 * There are some functions which can sleep for arbitrary periods
2999 * (paste_selection) but we don't need the lock there anyway.
3000 *
3001 * set_selection has locking, and definitely needs it
3002 */
3003
3004int tioclinux(struct tty_struct *tty, unsigned long arg)
3005{
3006 char type, data;
3007 char __user *p = (char __user *)arg;
3008 int lines;
3009 int ret;
3010
1da177e4
LT		 3011 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3012 return -EPERM;
3013 if (get_user(type, p))
3014 return -EFAULT;
3015 ret = 0;
04f378b1 3016
1da177e4
LT		 3017 switch (type)
3018 {
3019 case TIOCL_SETSEL:
ac751efa 3020 console_lock();
1da177e4 3021 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 3022 console_unlock();
1da177e4
LT		 3023 break;
3024 case TIOCL_PASTESEL:
3025 ret = paste_selection(tty);
3026 break;
3027 case TIOCL_UNBLANKSCREEN:
ac751efa 3028 console_lock();
1da177e4 3029 unblank_screen();
ac751efa 3030 console_unlock();
1da177e4
LT		 3031 break;
3032 case TIOCL_SELLOADLUT:
5289475d 3033 console_lock();
1da177e4 3034 ret = sel_loadlut(p);
5289475d 3035 console_unlock();
1da177e4
LT		 3036 break;
3037 case TIOCL_GETSHIFTSTATE:
04f378b1 3038
1da177e4
LT		 3039 /*
3040 * Make it possible to react to Shift+Mousebutton.
3041 * Note that 'shift_state' is an undocumented
3042 * kernel-internal variable; programs not closely
3043 * related to the kernel should not use this.
3044 */
079c9534 3045 data = vt_get_shift_state();
6987dc8a 3046 ret = put_user(data, p);
1da177e4
LT		 3047 break;
3048 case TIOCL_GETMOUSEREPORTING:
20f62579 3049 console_lock(); /* May be overkill */
1da177e4 3050 data = mouse_reporting();
20f62579 3051 console_unlock();
6987dc8a 3052 ret = put_user(data, p);
1da177e4
LT		 3053 break;
3054 case TIOCL_SETVESABLANK:
20f62579 3055 console_lock();
403aac96 3056 ret = set_vesa_blanking(p);
20f62579 3057 console_unlock();
1da177e4 3058 break;
0ca07731 3059 case TIOCL_GETKMSGREDIRECT:
5ada918b 3060 data = vt_get_kmsg_redirect();
6987dc8a 3061 ret = put_user(data, p);
0ca07731 3062 break;
1da177e4
LT		 3063 case TIOCL_SETKMSGREDIRECT:
3064 if (!capable(CAP_SYS_ADMIN)) {
3065 ret = -EPERM;
3066 } else {
3067 if (get_user(data, p+1))
3068 ret = -EFAULT;
3069 else
5ada918b 3070 vt_kmsg_redirect(data);
1da177e4
LT		 3071 }
3072 break;
3073 case TIOCL_GETFGCONSOLE:
20f62579
AC		 3074 /* No locking needed as this is a transiently
3075 correct return anyway if the caller hasn't
3076 disabled switching */
1da177e4
LT		 3077 ret = fg_console;
3078 break;
3079 case TIOCL_SCROLLCONSOLE:
3080 if (get_user(lines, (s32 __user *)(p+4))) {
3081 ret = -EFAULT;
3082 } else {
20f62579
AC		 3083 /* Need the console lock here. Note that lots
3084 of other calls need fixing before the lock
3085 is actually useful ! */
3086 console_lock();
1da177e4 3087 scrollfront(vc_cons[fg_console].d, lines);
20f62579 3088 console_unlock();
1da177e4
LT		 3089 ret = 0;
3090 }
3091 break;
3092 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 3093 console_lock();
1da177e4
LT		 3094 ignore_poke = 1;
3095 do_blank_screen(0);
ac751efa 3096 console_unlock();
1da177e4
LT		 3097 break;
3098 case TIOCL_BLANKEDSCREEN:
3099 ret = console_blanked;
3100 break;
3101 default:
3102 ret = -EINVAL;
3103 break;
3104 }
3105 return ret;
3106}
3107
3108/*
3109 * /dev/ttyN handling
3110 */
3111
3112static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3113{
3114 int retval;
3115
3116 retval = do_con_write(tty, buf, count);
3117 con_flush_chars(tty);
3118
3119 return retval;
3120}
3121
5d19f546 3122static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 3123{
3124 if (in_interrupt())
5d19f546
AC		 3125 return 0; /* n_r3964 calls put_char() from interrupt context */
3126 return do_con_write(tty, &ch, 1);
1da177e4
LT		 3127}
3128
3129static int con_write_room(struct tty_struct *tty)
3130{
3131 if (tty->stopped)
3132 return 0;
a88a69c9 3133 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 3134}
3135
3136static int con_chars_in_buffer(struct tty_struct *tty)
3137{
3138 return 0; /* we're not buffering */
3139}
3140
3141/*
3142 * con_throttle and con_unthrottle are only used for
3143 * paste_selection(), which has to stuff in a large number of
3144 * characters...
3145 */
3146static void con_throttle(struct tty_struct *tty)
3147{
3148}
3149
3150static void con_unthrottle(struct tty_struct *tty)
3151{
3152 struct vc_data *vc = tty->driver_data;
3153
3154 wake_up_interruptible(&vc->paste_wait);
3155}
3156
3157/*
3158 * Turn the Scroll-Lock LED on when the tty is stopped
3159 */
3160static void con_stop(struct tty_struct *tty)
3161{
3162 int console_num;
3163 if (!tty)
3164 return;
3165 console_num = tty->index;
3166 if (!vc_cons_allocated(console_num))
3167 return;
079c9534 3168 vt_kbd_con_stop(console_num);
1da177e4
LT		 3169}
3170
3171/*
3172 * Turn the Scroll-Lock LED off when the console is started
3173 */
3174static void con_start(struct tty_struct *tty)
3175{
3176 int console_num;
3177 if (!tty)
3178 return;
3179 console_num = tty->index;
3180 if (!vc_cons_allocated(console_num))
3181 return;
079c9534 3182 vt_kbd_con_start(console_num);
1da177e4
LT		 3183}
3184
3185static void con_flush_chars(struct tty_struct *tty)
3186{
3187 struct vc_data *vc;
3188
3189 if (in_interrupt()) /* from flush_to_ldisc */
3190 return;
3191
3192 /* if we race with con_close(), vt may be null */
ac751efa 3193 console_lock();
1da177e4
LT		 3194 vc = tty->driver_data;
3195 if (vc)
3196 set_cursor(vc);
ac751efa 3197 console_unlock();
1da177e4
LT		 3198}
3199
3200/*
3201 * Allocate the console screen memory.
3202 */
bc1e99d9 3203static int con_install(struct tty_driver *driver, struct tty_struct *tty)
1da177e4
LT		 3204{
3205 unsigned int currcons = tty->index;
bc1e99d9
JS		 3206 struct vc_data *vc;
3207 int ret;
1da177e4 3208
ac751efa 3209 console_lock();
bc1e99d9
JS		 3210 ret = vc_allocate(currcons);
3211 if (ret)
3212 goto unlock;
feebed65 3213
bc1e99d9 3214 vc = vc_cons[currcons].d;
1da177e4 3215
bc1e99d9
JS		 3216 /* Still being freed */
3217 if (vc->port.tty) {
3218 ret = -ERESTARTSYS;
3219 goto unlock;
3220 }
3221
3222 ret = tty_port_install(&vc->port, driver, tty);
3223 if (ret)
3224 goto unlock;
3225
3226 tty->driver_data = vc;
3227 vc->port.tty = tty;
3228
3229 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3230 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3231 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
1da177e4 3232 }
bc1e99d9 3233 if (vc->vc_utf)
adc8d746 3234 tty->termios.c_iflag |= IUTF8;
bc1e99d9 3235 else
adc8d746 3236 tty->termios.c_iflag &= ~IUTF8;
bc1e99d9 3237unlock:
ac751efa 3238 console_unlock();
1da177e4
LT		 3239 return ret;
3240}
3241
bc1e99d9
JS		 3242static int con_open(struct tty_struct *tty, struct file *filp)
3243{
3244 /* everything done in install */
3245 return 0;
3246}
3247
3248
1da177e4
LT		 3249static void con_close(struct tty_struct *tty, struct file *filp)
3250{
feebed65
AC		 3251 /* Nothing to do - we defer to shutdown */
3252}
1da177e4 3253
feebed65
AC		 3254static void con_shutdown(struct tty_struct *tty)
3255{
3256 struct vc_data *vc = tty->driver_data;
3257 BUG_ON(vc == NULL);
ac751efa 3258 console_lock();
8ce73264 3259 vc->port.tty = NULL;
ac751efa 3260 console_unlock();
1da177e4
LT		 3261}
3262
3855ae1c 3263static int default_color = 7; /* white */
fa6ce9ab
JE		 3264static int default_italic_color = 2; // green (ASCII)
3265static int default_underline_color = 3; // cyan (ASCII)
3855ae1c 3266module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
fa6ce9ab
JE		 3267module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3268module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3269
1da177e4
LT		 3270static void vc_init(struct vc_data *vc, unsigned int rows,
3271 unsigned int cols, int do_clear)
3272{
3273 int j, k ;
3274
3275 vc->vc_cols = cols;
3276 vc->vc_rows = rows;
3277 vc->vc_size_row = cols << 1;
3278 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3279
3280 set_origin(vc);
3281 vc->vc_pos = vc->vc_origin;
3282 reset_vc(vc);
3283 for (j=k=0; j<16; j++) {
3284 vc->vc_palette[k++] = default_red[j] ;
3285 vc->vc_palette[k++] = default_grn[j] ;
3286 vc->vc_palette[k++] = default_blu[j] ;
3287 }
3855ae1c 3288 vc->vc_def_color = default_color;
fa6ce9ab
JE		 3289 vc->vc_ulcolor = default_underline_color;
3290 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 3291 vc->vc_halfcolor = 0x08; /* grey */
3292 init_waitqueue_head(&vc->paste_wait);
3293 reset_terminal(vc, do_clear);
3294}
3295
3296/*
3297 * This routine initializes console interrupts, and does nothing
3298 * else. If you want the screen to clear, call tty_write with
3299 * the appropriate escape-sequence.
3300 */
3301
3302static int __init con_init(void)
3303{
3304 const char *display_desc = NULL;
3305 struct vc_data *vc;
3e795de7 3306 unsigned int currcons = 0, i;
1da177e4 3307
ac751efa 3308 console_lock();
1da177e4
LT		 3309
3310 if (conswitchp)
3311 display_desc = conswitchp->con_startup();
3312 if (!display_desc) {
3313 fg_console = 0;
ac751efa 3314 console_unlock();
1da177e4
LT		 3315 return 0;
3316 }
3317
3e795de7
AD		 3318 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3319 struct con_driver *con_driver = &registered_con_driver[i];
3320
3321 if (con_driver->con == NULL) {
3322 con_driver->con = conswitchp;
3323 con_driver->desc = display_desc;
3324 con_driver->flag = CON_DRIVER_FLAG_INIT;
3325 con_driver->first = 0;
3326 con_driver->last = MAX_NR_CONSOLES - 1;
3327 break;
3328 }
3329 }
3330
3331 for (i = 0; i < MAX_NR_CONSOLES; i++)
3332 con_driver_map[i] = conswitchp;
3333
1da177e4
LT		 3334 if (blankinterval) {
3335 blank_state = blank_normal_wait;
f324edc8 3336 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3337 }
3338
1da177e4 3339 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 3340 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 3341 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 3342 tty_port_init(&vc->port);
1da177e4 3343 visual_init(vc, currcons, 1);
a5f4f52e 3344 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 3345 vc_init(vc, vc->vc_rows, vc->vc_cols,
3346 currcons || !vc->vc_sw->con_save_screen);
3347 }
3348 currcons = fg_console = 0;
3349 master_display_fg = vc = vc_cons[currcons].d;
3350 set_origin(vc);
3351 save_screen(vc);
3352 gotoxy(vc, vc->vc_x, vc->vc_y);
3353 csi_J(vc, 0);
3354 update_screen(vc);
5da527aa 3355 pr_info("Console: %s %s %dx%d\n",
1da177e4
LT		 3356 vc->vc_can_do_color ? "colour" : "mono",
3357 display_desc, vc->vc_cols, vc->vc_rows);
3358 printable = 1;
1da177e4 3359
ac751efa 3360 console_unlock();
1da177e4
LT		 3361
3362#ifdef CONFIG_VT_CONSOLE
3363 register_console(&vt_console_driver);
3364#endif
3365 return 0;
3366}
3367console_initcall(con_init);
3368
b68e31d0 3369static const struct tty_operations con_ops = {
bc1e99d9 3370 .install = con_install,
1da177e4
LT		 3371 .open = con_open,
3372 .close = con_close,
3373 .write = con_write,
3374 .write_room = con_write_room,
3375 .put_char = con_put_char,
3376 .flush_chars = con_flush_chars,
3377 .chars_in_buffer = con_chars_in_buffer,
3378 .ioctl = vt_ioctl,
e9216651
AB		 3379#ifdef CONFIG_COMPAT
3380 .compat_ioctl = vt_compat_ioctl,
3381#endif
1da177e4
LT		 3382 .stop = con_stop,
3383 .start = con_start,
3384 .throttle = con_throttle,
3385 .unthrottle = con_unthrottle,
8c9a9dd0 3386 .resize = vt_resize,
feebed65 3387 .shutdown = con_shutdown
1da177e4
LT		 3388};
3389
d81ed103
AC		 3390static struct cdev vc0_cdev;
3391
fbc92a34
KS		 3392static ssize_t show_tty_active(struct device *dev,
3393 struct device_attribute *attr, char *buf)
3394{
3395 return sprintf(buf, "tty%d\n", fg_console + 1);
3396}
3397static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3398
1083a7be
TI		 3399static struct attribute *vt_dev_attrs[] = {
3400 &dev_attr_active.attr,
3401 NULL
3402};
3403
3404ATTRIBUTE_GROUPS(vt_dev);
3405
d81ed103 3406int __init vty_init(const struct file_operations *console_fops)
1da177e4 3407{
d81ed103
AC		 3408 cdev_init(&vc0_cdev, console_fops);
3409 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3410 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3411 panic("Couldn't register /dev/tty0 driver\n");
1083a7be
TI		 3412 tty0dev = device_create_with_groups(tty_class, NULL,
3413 MKDEV(TTY_MAJOR, 0), NULL,
3414 vt_dev_groups, "tty0");
fbc92a34
KS		 3415 if (IS_ERR(tty0dev))
3416 tty0dev = NULL;
d81ed103 3417
1da177e4
LT		 3418 vcs_init();
3419
3420 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3421 if (!console_driver)
3422 panic("Couldn't allocate console driver\n");
2f16669d 3423
1da177e4
LT		 3424 console_driver->name = "tty";
3425 console_driver->name_base = 1;
3426 console_driver->major = TTY_MAJOR;
3427 console_driver->minor_start = 1;
3428 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3429 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 3430 if (default_utf8)
3431 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3432 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3433 tty_set_operations(console_driver, &con_ops);
3434 if (tty_register_driver(console_driver))
3435 panic("Couldn't register console driver\n");
1da177e4
LT		 3436 kbd_init();
3437 console_map_init();
1da177e4
LT		 3438#ifdef CONFIG_MDA_CONSOLE
3439 mda_console_init();
3440#endif
3441 return 0;
3442}
3443
3444#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3445
3446static struct class *vtconsole_class;
3447
50e244cc 3448static int do_bind_con_driver(const struct consw *csw, int first, int last,
b7269dd2 3449 int deflt)
1da177e4 3450{
3e795de7
AD		 3451 struct module *owner = csw->owner;
3452 const char *desc = NULL;
3453 struct con_driver *con_driver;
3454 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3455
1da177e4
LT		 3456 if (!try_module_get(owner))
3457 return -ENODEV;
3458
50e244cc 3459 WARN_CONSOLE_UNLOCKED();
1c8ce271 3460
3e795de7
AD		 3461 /* check if driver is registered */
3462 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3463 con_driver = &registered_con_driver[i];
3464
3465 if (con_driver->con == csw) {
3466 desc = con_driver->desc;
3467 retval = 0;
3468 break;
3469 }
3470 }
3471
3472 if (retval)
3473 goto err;
3474
3475 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3476 csw->con_startup();
3477 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3478 }
1c8ce271 3479
1da177e4
LT		 3480 if (deflt) {
3481 if (conswitchp)
3482 module_put(conswitchp->owner);
1c8ce271 3483
1da177e4
LT		 3484 __module_get(owner);
3485 conswitchp = csw;
3486 }
3487
3e795de7
AD		 3488 first = max(first, con_driver->first);
3489 last = min(last, con_driver->last);
3490
1da177e4
LT		 3491 for (i = first; i <= last; i++) {
3492 int old_was_color;
3493 struct vc_data *vc = vc_cons[i].d;
3494
3495 if (con_driver_map[i])
3496 module_put(con_driver_map[i]->owner);
3497 __module_get(owner);
3498 con_driver_map[i] = csw;
3499
3500 if (!vc || !vc->vc_sw)
3501 continue;
3502
3503 j = i;
1c8ce271 3504
6ca8dfd7 3505 if (con_is_visible(vc)) {
4ee1acce 3506 k = i;
1da177e4 3507 save_screen(vc);
4ee1acce
DH		 3508 }
3509
1da177e4
LT		 3510 old_was_color = vc->vc_can_do_color;
3511 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3512 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3513 visual_init(vc, i, 0);
1c8ce271 3514 set_origin(vc);
1da177e4
LT		 3515 update_attr(vc);
3516
3517 /* If the console changed between mono <-> color, then
3518 * the attributes in the screenbuf will be wrong. The
3519 * following resets all attributes to something sane.
3520 */
3521 if (old_was_color != vc->vc_can_do_color)
3522 clear_buffer_attributes(vc);
1da177e4 3523 }
4ee1acce 3524
1ffdda95 3525 pr_info("Console: switching ");
1da177e4 3526 if (!deflt)
bccf1da3 3527 pr_cont("consoles %d-%d ", first + 1, last + 1);
4ee1acce
DH		 3528 if (j >= 0) {
3529 struct vc_data *vc = vc_cons[j].d;
3530
bccf1da3
JP		 3531 pr_cont("to %s %s %dx%d\n",
3532 vc->vc_can_do_color ? "colour" : "mono",
3533 desc, vc->vc_cols, vc->vc_rows);
4ee1acce
DH		 3534
3535 if (k >= 0) {
3536 vc = vc_cons[k].d;
3537 update_screen(vc);
3538 }
bccf1da3
JP		 3539 } else {
3540 pr_cont("to %s\n", desc);
3541 }
1da177e4 3542
3e795de7
AD		 3543 retval = 0;
3544err:
1da177e4 3545 module_put(owner);
3e795de7
AD		 3546 return retval;
3547};
1da177e4 3548
50e244cc 3549
13ae6645 3550#ifdef CONFIG_VT_HW_CONSOLE_BINDING
e93a9a86
TI		 3551/* unlocked version of unbind_con_driver() */
3552int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3553{
3e795de7
AD		 3554 struct module *owner = csw->owner;
3555 const struct consw *defcsw = NULL;
3556 struct con_driver *con_driver = NULL, *con_back = NULL;
3557 int i, retval = -ENODEV;
1da177e4 3558
3e795de7
AD		 3559 if (!try_module_get(owner))
3560 return -ENODEV;
3561
e93a9a86 3562 WARN_CONSOLE_UNLOCKED();
3e795de7
AD		 3563
3564 /* check if driver is registered and if it is unbindable */
3565 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3566 con_driver = &registered_con_driver[i];
3567
3568 if (con_driver->con == csw &&
6db4063c 3569 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3570 retval = 0;
3571 break;
3572 }
3573 }
3574
e93a9a86 3575 if (retval)
3e795de7 3576 goto err;
3e795de7 3577
6db4063c
AD		 3578 retval = -ENODEV;
3579
3e795de7
AD		 3580 /* check if backup driver exists */
3581 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3582 con_back = &registered_con_driver[i];
3583
249f7b3e 3584 if (con_back->con && con_back->con != csw) {
3e795de7
AD		 3585 defcsw = con_back->con;
3586 retval = 0;
3587 break;
3588 }
3589 }
3590
e93a9a86 3591 if (retval)
3e795de7 3592 goto err;
3e795de7 3593
e93a9a86 3594 if (!con_is_bound(csw))
3e795de7 3595 goto err;
3e795de7
AD		 3596
3597 first = max(first, con_driver->first);
3598 last = min(last, con_driver->last);
3599
3600 for (i = first; i <= last; i++) {
1da177e4
LT		 3601 if (con_driver_map[i] == csw) {
3602 module_put(csw->owner);
3603 con_driver_map[i] = NULL;
3604 }
3e795de7
AD		 3605 }
3606
3607 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3608 const struct consw *defconsw = conswitchp;
3609
3e795de7
AD		 3610 defcsw->con_startup();
3611 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3612 /*
3613 * vgacon may change the default driver to point
3614 * to dummycon, we restore it here...
3615 */
3616 conswitchp = defconsw;
3e795de7
AD		 3617 }
3618
3619 if (!con_is_bound(csw))
3620 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3621
6db4063c 3622 /* ignore return value, binding should not fail */
50e244cc 3623 do_bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3624err:
3625 module_put(owner);
3626 return retval;
3627
3628}
e93a9a86 3629EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3e795de7 3630
6db4063c
AD		 3631static int vt_bind(struct con_driver *con)
3632{
3633 const struct consw *defcsw = NULL, *csw = NULL;
3634 int i, more = 1, first = -1, last = -1, deflt = 0;
3635
77232f79 3636 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3637 goto err;
3638
3639 csw = con->con;
3640
3641 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3642 struct con_driver *con = &registered_con_driver[i];
3643
3644 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3645 defcsw = con->con;
3646 break;
3647 }
3648 }
3649
3650 if (!defcsw)
3651 goto err;
3652
3653 while (more) {
3654 more = 0;
3655
3656 for (i = con->first; i <= con->last; i++) {
3657 if (con_driver_map[i] == defcsw) {
3658 if (first == -1)
3659 first = i;
3660 last = i;
3661 more = 1;
3662 } else if (first != -1)
3663 break;
3664 }
3665
3666 if (first == 0 && last == MAX_NR_CONSOLES -1)
3667 deflt = 1;
3668
4c215fe8 3669 if (first != -1)
c62a1e57 3670 do_bind_con_driver(csw, first, last, deflt);
6db4063c
AD		 3671
3672 first = -1;
3673 last = -1;
3674 deflt = 0;
3675 }
3676
3677err:
3678 return 0;
3679}
3680
3681static int vt_unbind(struct con_driver *con)
3682{
3683 const struct consw *csw = NULL;
3684 int i, more = 1, first = -1, last = -1, deflt = 0;
f418f2ec 3685 int ret;
6db4063c 3686
77232f79 3687 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
6db4063c
AD		 3688 goto err;
3689
3690 csw = con->con;
3691
3692 while (more) {
3693 more = 0;
3694
3695 for (i = con->first; i <= con->last; i++) {
3696 if (con_driver_map[i] == csw) {
3697 if (first == -1)
3698 first = i;
3699 last = i;
3700 more = 1;
3701 } else if (first != -1)
3702 break;
3703 }
3704
3705 if (first == 0 && last == MAX_NR_CONSOLES -1)
3706 deflt = 1;
3707
618f2b90 3708 if (first != -1) {
f418f2ec 3709 ret = do_unbind_con_driver(csw, first, last, deflt);
f418f2ec
DV		 3710 if (ret != 0)
3711 return ret;
618f2b90 3712 }
6db4063c
AD		 3713
3714 first = -1;
3715 last = -1;
3716 deflt = 0;
3717 }
3718
3719err:
3720 return 0;
3721}
13ae6645
AD		 3722#else
3723static inline int vt_bind(struct con_driver *con)
3724{
3725 return 0;
3726}
3727static inline int vt_unbind(struct con_driver *con)
3728{
3729 return 0;
3730}
3731#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3732
805952a8 3733static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3734 const char *buf, size_t count)
3735{
805952a8 3736 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3737 int bind = simple_strtoul(buf, NULL, 0);
3738
4c215fe8
ID		 3739 console_lock();
3740
6db4063c
AD		 3741 if (bind)
3742 vt_bind(con);
3743 else
3744 vt_unbind(con);
3745
4c215fe8
ID		 3746 console_unlock();
3747
6db4063c
AD		 3748 return count;
3749}
3750
805952a8
GKH		 3751static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3752 char *buf)
6db4063c 3753{
805952a8 3754 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3755 int bind = con_is_bound(con->con);
3756
3757 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3758}
3759
805952a8
GKH		 3760static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3761 char *buf)
6db4063c 3762{
805952a8 3763 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3764
3765 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3766 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3767 con->desc);
3768
3769}
3770
1083a7be
TI		 3771static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3772static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3773
3774static struct attribute *con_dev_attrs[] = {
3775 &dev_attr_bind.attr,
3776 &dev_attr_name.attr,
3777 NULL
6db4063c
AD		 3778};
3779
1083a7be
TI		 3780ATTRIBUTE_GROUPS(con_dev);
3781
805952a8 3782static int vtconsole_init_device(struct con_driver *con)
6db4063c 3783{
928e964f 3784 con->flag |= CON_DRIVER_FLAG_ATTR;
1083a7be 3785 return 0;
6db4063c
AD		 3786}
3787
805952a8 3788static void vtconsole_deinit_device(struct con_driver *con)
6db4063c 3789{
1083a7be 3790 con->flag &= ~CON_DRIVER_FLAG_ATTR;
6db4063c
AD		 3791}
3792
3e795de7
AD		 3793/**
3794 * con_is_bound - checks if driver is bound to the console
3795 * @csw: console driver
3796 *
3797 * RETURNS: zero if unbound, nonzero if bound
3798 *
3799 * Drivers can call this and if zero, they should release
3800 * all resources allocated on con_startup()
3801 */
3802int con_is_bound(const struct consw *csw)
3803{
3804 int i, bound = 0;
3805
3806 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3807 if (con_driver_map[i] == csw) {
3808 bound = 1;
3809 break;
3810 }
3811 }
3812
3813 return bound;
3814}
3815EXPORT_SYMBOL(con_is_bound);
3816
b45cfba4
JB		 3817/**
3818 * con_debug_enter - prepare the console for the kernel debugger
3819 * @sw: console driver
3820 *
3821 * Called when the console is taken over by the kernel debugger, this
3822 * function needs to save the current console state, then put the console
3823 * into a state suitable for the kernel debugger.
3824 *
3825 * RETURNS:
3826 * Zero on success, nonzero if a failure occurred when trying to prepare
3827 * the console for the debugger.
3828 */
3829int con_debug_enter(struct vc_data *vc)
3830{
3831 int ret = 0;
3832
3833 saved_fg_console = fg_console;
3834 saved_last_console = last_console;
3835 saved_want_console = want_console;
3836 saved_vc_mode = vc->vc_mode;
beed5336 3837 saved_console_blanked = console_blanked;
b45cfba4
JB		 3838 vc->vc_mode = KD_TEXT;
3839 console_blanked = 0;
3840 if (vc->vc_sw->con_debug_enter)
3841 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3842#ifdef CONFIG_KGDB_KDB
3843 /* Set the initial LINES variable if it is not already set */
3844 if (vc->vc_rows < 999) {
3845 int linecount;
3846 char lns[4];
3847 const char *setargs[3] = {
3848 "set",
3849 "LINES",
3850 lns,
3851 };
3852 if (kdbgetintenv(setargs[0], &linecount)) {
3853 snprintf(lns, 4, "%i", vc->vc_rows);
3854 kdb_set(2, setargs);
3855 }
3856 }
17b572e8
JW		 3857 if (vc->vc_cols < 999) {
3858 int colcount;
3859 char cols[4];
3860 const char *setargs[3] = {
3861 "set",
3862 "COLUMNS",
3863 cols,
3864 };
3865 if (kdbgetintenv(setargs[0], &colcount)) {
3866 snprintf(cols, 4, "%i", vc->vc_cols);
3867 kdb_set(2, setargs);
3868 }
3869 }
81d44507 3870#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3871 return ret;
3872}
3873EXPORT_SYMBOL_GPL(con_debug_enter);
3874
3875/**
3876 * con_debug_leave - restore console state
3877 * @sw: console driver
3878 *
3879 * Restore the console state to what it was before the kernel debugger
3880 * was invoked.
3881 *
3882 * RETURNS:
3883 * Zero on success, nonzero if a failure occurred when trying to restore
3884 * the console.
3885 */
3886int con_debug_leave(void)
3887{
3888 struct vc_data *vc;
3889 int ret = 0;
3890
3891 fg_console = saved_fg_console;
3892 last_console = saved_last_console;
3893 want_console = saved_want_console;
beed5336 3894 console_blanked = saved_console_blanked;
b45cfba4
JB		 3895 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3896
3897 vc = vc_cons[fg_console].d;
3898 if (vc->vc_sw->con_debug_leave)
3899 ret = vc->vc_sw->con_debug_leave(vc);
3900 return ret;
3901}
3902EXPORT_SYMBOL_GPL(con_debug_leave);
3903
50e244cc 3904static int do_register_con_driver(const struct consw *csw, int first, int last)
3e795de7
AD		 3905{
3906 struct module *owner = csw->owner;
3907 struct con_driver *con_driver;
3908 const char *desc;
96317e9e 3909 int i, retval;
3e795de7 3910
50e244cc
AC		 3911 WARN_CONSOLE_UNLOCKED();
3912
3e795de7
AD		 3913 if (!try_module_get(owner))
3914 return -ENODEV;
3915
3e795de7
AD		 3916 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3917 con_driver = &registered_con_driver[i];
3918
3919 /* already registered */
96317e9e 3920 if (con_driver->con == csw) {
c55c63c6 3921 retval = -EBUSY;
96317e9e
JS		 3922 goto err;
3923 }
3e795de7
AD		 3924 }
3925
3e795de7 3926 desc = csw->con_startup();
6798df4c
JS		 3927 if (!desc) {
3928 retval = -ENODEV;
3e795de7 3929 goto err;
6798df4c 3930 }
3e795de7
AD		 3931
3932 retval = -EINVAL;
3933
3934 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3935 con_driver = &registered_con_driver[i];
3936
d364b5c3
ID		 3937 if (con_driver->con == NULL &&
3938 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3e795de7
AD		 3939 con_driver->con = csw;
3940 con_driver->desc = desc;
6db4063c
AD		 3941 con_driver->node = i;
3942 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3943 CON_DRIVER_FLAG_INIT;
3944 con_driver->first = first;
3945 con_driver->last = last;
3946 retval = 0;
3947 break;
3948 }
3949 }
3950
6db4063c
AD		 3951 if (retval)
3952 goto err;
3953
1083a7be
TI		 3954 con_driver->dev =
3955 device_create_with_groups(vtconsole_class, NULL,
3956 MKDEV(0, con_driver->node),
3957 con_driver, con_dev_groups,
3958 "vtcon%i", con_driver->node);
805952a8 3959 if (IS_ERR(con_driver->dev)) {
bccf1da3
JP		 3960 pr_warn("Unable to create device for %s; errno = %ld\n",
3961 con_driver->desc, PTR_ERR(con_driver->dev));
805952a8 3962 con_driver->dev = NULL;
6db4063c 3963 } else {
805952a8 3964 vtconsole_init_device(con_driver);
6db4063c 3965 }
928e964f 3966
3e795de7 3967err:
3e795de7
AD		 3968 module_put(owner);
3969 return retval;
3970}
50e244cc 3971
3e795de7
AD		 3972
3973/**
50539dd4 3974 * do_unregister_con_driver - unregister console driver from console layer
3e795de7
AD		 3975 * @csw: console driver
3976 *
3977 * DESCRIPTION: All drivers that registers to the console layer must
3978 * call this function upon exit, or if the console driver is in a state
3979 * where it won't be able to handle console services, such as the
3980 * framebuffer console without loaded framebuffer drivers.
3981 *
3982 * The driver must unbind first prior to unregistration.
3983 */
e93a9a86
TI		 3984int do_unregister_con_driver(const struct consw *csw)
3985{
d9c660e7 3986 int i;
3e795de7
AD		 3987
3988 /* cannot unregister a bound driver */
3989 if (con_is_bound(csw))
d9c660e7
DV		 3990 return -EBUSY;
3991
3992 if (csw == conswitchp)
3993 return -EINVAL;
3e795de7
AD		 3994
3995 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3996 struct con_driver *con_driver = &registered_con_driver[i];
3997
2cf30f75 3998 if (con_driver->con == csw) {
d364b5c3
ID		 3999 /*
4000 * Defer the removal of the sysfs entries since that
4001 * will acquire the kernfs s_active lock and we can't
4002 * acquire this lock while holding the console lock:
4003 * the unbind sysfs entry imposes already the opposite
4004 * order. Reset con already here to prevent any later
4005 * lookup to succeed and mark this slot as zombie, so
4006 * it won't get reused until we complete the removal
4007 * in the deferred work.
4008 */
3e795de7 4009 con_driver->con = NULL;
d364b5c3
ID		 4010 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4011 schedule_work(&con_driver_unregister_work);
4012
d9c660e7 4013 return 0;
3e795de7
AD		 4014 }
4015 }
d9c660e7
DV		 4016
4017 return -ENODEV;
3e795de7 4018}
e93a9a86 4019EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3e795de7 4020
d364b5c3
ID		 4021static void con_driver_unregister_callback(struct work_struct *ignored)
4022{
4023 int i;
4024
4025 console_lock();
4026
4027 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4028 struct con_driver *con_driver = &registered_con_driver[i];
4029
4030 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4031 continue;
4032
4033 console_unlock();
4034
4035 vtconsole_deinit_device(con_driver);
4036 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4037
4038 console_lock();
4039
4040 if (WARN_ON_ONCE(con_driver->con))
4041 con_driver->con = NULL;
4042 con_driver->desc = NULL;
4043 con_driver->dev = NULL;
4044 con_driver->node = 0;
4045 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4046 con_driver->flag = 0;
4047 con_driver->first = 0;
4048 con_driver->last = 0;
4049 }
4050
4051 console_unlock();
4052}
4053
3e795de7
AD		 4054/*
4055 * If we support more console drivers, this function is used
4056 * when a driver wants to take over some existing consoles
4057 * and become default driver for newly opened ones.
4058 *
155957f5 4059 * do_take_over_console is basically a register followed by unbind
50e244cc
AC		 4060 */
4061int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4062{
4063 int err;
4064
4065 err = do_register_con_driver(csw, first, last);
4066 /*
4067 * If we get an busy error we still want to bind the console driver
4068 * and return success, as we may have unbound the console driver
4069 * but not unregistered it.
4070 */
4071 if (err == -EBUSY)
4072 err = 0;
4073 if (!err)
4074 do_bind_con_driver(csw, first, last, deflt);
4075
4076 return err;
4077}
4078EXPORT_SYMBOL_GPL(do_take_over_console);
4079
3e795de7
AD		 4080
4081/*
4082 * give_up_console is a wrapper to unregister_con_driver. It will only
4083 * work if driver is fully unbound.
4084 */
4085void give_up_console(const struct consw *csw)
4086{
70125e76
WY		 4087 console_lock();
4088 do_unregister_con_driver(csw);
4089 console_unlock();
3e795de7
AD		 4090}
4091
6db4063c 4092static int __init vtconsole_class_init(void)
3e795de7 4093{
6db4063c 4094 int i;
3e795de7 4095
6db4063c
AD		 4096 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4097 if (IS_ERR(vtconsole_class)) {
bccf1da3
JP		 4098 pr_warn("Unable to create vt console class; errno = %ld\n",
4099 PTR_ERR(vtconsole_class));
6db4063c
AD		 4100 vtconsole_class = NULL;
4101 }
3e795de7 4102
6db4063c 4103 /* Add system drivers to sysfs */
3e795de7
AD		 4104 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4105 struct con_driver *con = &registered_con_driver[i];
4106
805952a8 4107 if (con->con && !con->dev) {
1083a7be
TI		 4108 con->dev =
4109 device_create_with_groups(vtconsole_class, NULL,
4110 MKDEV(0, con->node),
4111 con, con_dev_groups,
4112 "vtcon%i", con->node);
6db4063c 4113
805952a8 4114 if (IS_ERR(con->dev)) {
bccf1da3
JP		 4115 pr_warn("Unable to create device for %s; errno = %ld\n",
4116 con->desc, PTR_ERR(con->dev));
805952a8 4117 con->dev = NULL;
6db4063c 4118 } else {
805952a8 4119 vtconsole_init_device(con);
6db4063c 4120 }
3e795de7 4121 }
3e795de7
AD		 4122 }
4123
3e795de7
AD		 4124 return 0;
4125}
6db4063c 4126postcore_initcall(vtconsole_class_init);
3e795de7 4127
1da177e4
LT		 4128#endif
4129
4130/*
4131 * Screen blanking
4132 */
4133
403aac96 4134static int set_vesa_blanking(char __user *p)
1da177e4 4135{
403aac96
YY		 4136 unsigned int mode;
4137
4138 if (get_user(mode, p + 1))
4139 return -EFAULT;
4140
4141 vesa_blank_mode = (mode < 4) ? mode : 0;
4142 return 0;
1da177e4
LT		 4143}
4144
1da177e4
LT		 4145void do_blank_screen(int entering_gfx)
4146{
4147 struct vc_data *vc = vc_cons[fg_console].d;
4148 int i;
4149
4150 WARN_CONSOLE_UNLOCKED();
4151
4152 if (console_blanked) {
4153 if (blank_state == blank_vesa_wait) {
4154 blank_state = blank_off;
d060a321 4155 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 4156 }
4157 return;
4158 }
1da177e4
LT		 4159
4160 /* entering graphics mode? */
4161 if (entering_gfx) {
4162 hide_cursor(vc);
4163 save_screen(vc);
4164 vc->vc_sw->con_blank(vc, -1, 1);
4165 console_blanked = fg_console + 1;
b6e8f00f 4166 blank_state = blank_off;
1da177e4
LT		 4167 set_origin(vc);
4168 return;
4169 }
4170
b6e8f00f 4171 if (blank_state != blank_normal_wait)
4172 return;
4173 blank_state = blank_off;
4174
1da177e4
LT		 4175 /* don't blank graphics */
4176 if (vc->vc_mode != KD_TEXT) {
4177 console_blanked = fg_console + 1;
4178 return;
4179 }
4180
4181 hide_cursor(vc);
4182 del_timer_sync(&console_timer);
4183 blank_timer_expired = 0;
4184
4185 save_screen(vc);
4186 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 4187 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 4188 console_blanked = fg_console + 1;
4189 if (i)
4190 set_origin(vc);
4191
4192 if (console_blank_hook && console_blank_hook(1))
4193 return;
4194
d060a321 4195 if (vesa_off_interval && vesa_blank_mode) {
030babac 4196 blank_state = blank_vesa_wait;
1da177e4
LT		 4197 mod_timer(&console_timer, jiffies + vesa_off_interval);
4198 }
8b92e87d 4199 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4200}
4201EXPORT_SYMBOL(do_blank_screen);
4202
4203/*
4204 * Called by timer as well as from vt_console_driver
4205 */
4206void do_unblank_screen(int leaving_gfx)
4207{
4208 struct vc_data *vc;
4209
4210 /* This should now always be called from a "sane" (read: can schedule)
4211 * context for the sake of the low level drivers, except in the special
4212 * case of oops_in_progress
4213 */
4214 if (!oops_in_progress)
4215 might_sleep();
4216
4217 WARN_CONSOLE_UNLOCKED();
4218
4219 ignore_poke = 0;
4220 if (!console_blanked)
4221 return;
4222 if (!vc_cons_allocated(fg_console)) {
4223 /* impossible */
e620e548
JP		 4224 pr_warn("unblank_screen: tty %d not allocated ??\n",
4225 fg_console + 1);
1da177e4
LT		 4226 return;
4227 }
4228 vc = vc_cons[fg_console].d;
8d7fc299 4229 if (vc->vc_mode != KD_TEXT)
1da177e4
LT		 4230 return; /* but leave console_blanked != 0 */
4231
4232 if (blankinterval) {
f324edc8 4233 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4234 blank_state = blank_normal_wait;
4235 }
4236
4237 console_blanked = 0;
8d7fc299 4238 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
1da177e4
LT		 4239 /* Low-level driver cannot restore -> do it ourselves */
4240 update_screen(vc);
4241 if (console_blank_hook)
4242 console_blank_hook(0);
4243 set_palette(vc);
4244 set_cursor(vc);
8b92e87d 4245 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 4246}
4247EXPORT_SYMBOL(do_unblank_screen);
4248
4249/*
4250 * This is called by the outside world to cause a forced unblank, mostly for
4251 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4252 * call it with 1 as an argument and so force a mode restore... that may kill
4253 * X or at least garbage the screen but would also make the Oops visible...
4254 */
4255void unblank_screen(void)
4256{
4257 do_unblank_screen(0);
4258}
4259
4260/*
70522e12 4261 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 4262 * (console operations can still happen at irq time, but only from printk which
70522e12 4263 * has the console mutex. Not perfect yet, but better than no locking
1da177e4 4264 */
24ed960a 4265static void blank_screen_t(struct timer_list *unused)
1da177e4
LT		 4266{
4267 blank_timer_expired = 1;
4268 schedule_work(&console_work);
4269}
4270
4271void poke_blanked_console(void)
4272{
4273 WARN_CONSOLE_UNLOCKED();
4274
4275 /* Add this so we quickly catch whoever might call us in a non
4276 * safe context. Nowadays, unblank_screen() isn't to be called in
4277 * atomic contexts and is allowed to schedule (with the special case
4278 * of oops_in_progress, but that isn't of any concern for this
4279 * function. --BenH.
4280 */
4281 might_sleep();
4282
4283 /* This isn't perfectly race free, but a race here would be mostly harmless,
4284 * at worse, we'll do a spurrious blank and it's unlikely
4285 */
4286 del_timer(&console_timer);
4287 blank_timer_expired = 0;
4288
4289 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4290 return;
4291 if (console_blanked)
4292 unblank_screen();
4293 else if (blankinterval) {
f324edc8 4294 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 4295 blank_state = blank_normal_wait;
4296 }
4297}
4298
4299/*
4300 * Palettes
4301 */
4302
4303static void set_palette(struct vc_data *vc)
4304{
4305 WARN_CONSOLE_UNLOCKED();
4306
709280da 4307 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
1da177e4
LT		 4308 vc->vc_sw->con_set_palette(vc, color_table);
4309}
4310
1da177e4
LT		 4311/*
4312 * Load palette into the DAC registers. arg points to a colour
4313 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4314 */
4315
4316int con_set_cmap(unsigned char __user *arg)
4317{
871bdea6
MG		 4318 int i, j, k;
4319 unsigned char colormap[3*16];
4320
4321 if (copy_from_user(colormap, arg, sizeof(colormap)))
4322 return -EFAULT;
1da177e4 4323
ac751efa 4324 console_lock();
871bdea6
MG		 4325 for (i = k = 0; i < 16; i++) {
4326 default_red[i] = colormap[k++];
4327 default_grn[i] = colormap[k++];
4328 default_blu[i] = colormap[k++];
4329 }
4330 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4331 if (!vc_cons_allocated(i))
4332 continue;
4333 for (j = k = 0; j < 16; j++) {
4334 vc_cons[i].d->vc_palette[k++] = default_red[j];
4335 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4336 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4337 }
4338 set_palette(vc_cons[i].d);
4339 }
ac751efa 4340 console_unlock();
1da177e4 4341
871bdea6 4342 return 0;
1da177e4
LT		 4343}
4344
4345int con_get_cmap(unsigned char __user *arg)
4346{
871bdea6
MG		 4347 int i, k;
4348 unsigned char colormap[3*16];
1da177e4 4349
ac751efa 4350 console_lock();
871bdea6
MG		 4351 for (i = k = 0; i < 16; i++) {
4352 colormap[k++] = default_red[i];
4353 colormap[k++] = default_grn[i];
4354 colormap[k++] = default_blu[i];
4355 }
ac751efa 4356 console_unlock();
1da177e4 4357
871bdea6
MG		 4358 if (copy_to_user(arg, colormap, sizeof(colormap)))
4359 return -EFAULT;
4360
4361 return 0;
1da177e4
LT		 4362}
4363
4364void reset_palette(struct vc_data *vc)
4365{
4366 int j, k;
4367 for (j=k=0; j<16; j++) {
4368 vc->vc_palette[k++] = default_red[j];
4369 vc->vc_palette[k++] = default_grn[j];
4370 vc->vc_palette[k++] = default_blu[j];
4371 }
4372 set_palette(vc);
4373}
4374
4375/*
4376 * Font switching
4377 *
4378 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4379 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4380 * depending on width) reserved for each character which is kinda wasty, but
4381 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 4382 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 4383 * format (maybe we should add a `fontoffset' field to the `display'
4384 * structure so we won't have to convert the fontdata all the time.
4385 * /Jes
4386 */
4387
4388#define max_font_size 65536
4389
4390static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4391{
4392 struct console_font font;
4393 int rc = -EINVAL;
4394 int c;
4395
1da177e4
LT		 4396 if (op->data) {
4397 font.data = kmalloc(max_font_size, GFP_KERNEL);
4398 if (!font.data)
4399 return -ENOMEM;
4400 } else
4401 font.data = NULL;
4402
ac751efa 4403 console_lock();
edab558f
AC		 4404 if (vc->vc_mode != KD_TEXT)
4405 rc = -EINVAL;
4406 else if (vc->vc_sw->con_font_get)
1da177e4
LT		 4407 rc = vc->vc_sw->con_font_get(vc, &font);
4408 else
4409 rc = -ENOSYS;
ac751efa 4410 console_unlock();
1da177e4
LT		 4411
4412 if (rc)
4413 goto out;
4414
4415 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4416
1da177e4
LT		 4417 if (op->data && font.charcount > op->charcount)
4418 rc = -ENOSPC;
4419 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4420 if (font.width > op->width || font.height > op->height)
4421 rc = -ENOSPC;
4422 } else {
4423 if (font.width != 8)
4424 rc = -EIO;
4425 else if ((op->height && font.height > op->height) ||
4426 font.height > 32)
4427 rc = -ENOSPC;
4428 }
4429 if (rc)
4430 goto out;
4431
4432 op->height = font.height;
4433 op->width = font.width;
4434 op->charcount = font.charcount;
4435
4436 if (op->data && copy_to_user(op->data, font.data, c))
4437 rc = -EFAULT;
4438
4439out:
4440 kfree(font.data);
4441 return rc;
4442}
4443
4444static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4445{
4446 struct console_font font;
4447 int rc = -EINVAL;
4448 int size;
4449
4450 if (vc->vc_mode != KD_TEXT)
4451 return -EINVAL;
4452 if (!op->data)
4453 return -EINVAL;
4454 if (op->charcount > 512)
4455 return -EINVAL;
8ffb8209
MX		 4456 if (op->width <= 0 || op->width > 32 || op->height > 32)
4457 return -EINVAL;
4458 size = (op->width+7)/8 * 32 * op->charcount;
4459 if (size > max_font_size)
4460 return -ENOSPC;
4461
4462 font.data = memdup_user(op->data, size);
4463 if (IS_ERR(font.data))
4464 return PTR_ERR(font.data);
4465
1da177e4
LT		 4466 if (!op->height) { /* Need to guess font height [compat] */
4467 int h, i;
8ffb8209
MX		 4468 u8 *charmap = font.data;
4469
4470 /*
4471 * If from KDFONTOP ioctl, don't allow things which can be done
4472 * in userland,so that we can get rid of this soon
4473 */
4474 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4475 kfree(font.data);
1da177e4 4476 return -EINVAL;
8ffb8209
MX		 4477 }
4478
1da177e4 4479 for (h = 32; h > 0; h--)
8ffb8209
MX		 4480 for (i = 0; i < op->charcount; i++)
4481 if (charmap[32*i+h-1])
1da177e4 4482 goto nonzero;
8ffb8209
MX		 4483
4484 kfree(font.data);
1da177e4 4485 return -EINVAL;
8ffb8209 4486
1da177e4
LT		 4487 nonzero:
4488 op->height = h;
4489 }
8ffb8209 4490
1da177e4 4491 font.charcount = op->charcount;
1da177e4 4492 font.width = op->width;
8ffb8209
MX		 4493 font.height = op->height;
4494
ac751efa 4495 console_lock();
edab558f
AC		 4496 if (vc->vc_mode != KD_TEXT)
4497 rc = -EINVAL;
4498 else if (vc->vc_sw->con_font_set)
1da177e4
LT		 4499 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4500 else
4501 rc = -ENOSYS;
ac751efa 4502 console_unlock();
1da177e4
LT		 4503 kfree(font.data);
4504 return rc;
4505}
4506
4507static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4508{
4509 struct console_font font = {.width = op->width, .height = op->height};
4510 char name[MAX_FONT_NAME];
4511 char *s = name;
4512 int rc;
4513
1da177e4
LT		 4514
4515 if (!op->data)
4516 s = NULL;
4517 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4518 return -EFAULT;
4519 else
4520 name[MAX_FONT_NAME - 1] = 0;
4521
ac751efa 4522 console_lock();
edab558f
AC		 4523 if (vc->vc_mode != KD_TEXT) {
4524 console_unlock();
4525 return -EINVAL;
4526 }
1da177e4
LT		 4527 if (vc->vc_sw->con_font_default)
4528 rc = vc->vc_sw->con_font_default(vc, &font, s);
4529 else
4530 rc = -ENOSYS;
ac751efa 4531 console_unlock();
1da177e4
LT		 4532 if (!rc) {
4533 op->width = font.width;
4534 op->height = font.height;
4535 }
4536 return rc;
4537}
4538
4539static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4540{
4541 int con = op->height;
4542 int rc;
4543
1da177e4 4544
ac751efa 4545 console_lock();
edab558f
AC		 4546 if (vc->vc_mode != KD_TEXT)
4547 rc = -EINVAL;
4548 else if (!vc->vc_sw->con_font_copy)
1da177e4
LT		 4549 rc = -ENOSYS;
4550 else if (con < 0 || !vc_cons_allocated(con))
4551 rc = -ENOTTY;
4552 else if (con == vc->vc_num) /* nothing to do */
4553 rc = 0;
4554 else
4555 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4556 console_unlock();
1da177e4
LT		 4557 return rc;
4558}
4559
4560int con_font_op(struct vc_data *vc, struct console_font_op *op)
4561{
4562 switch (op->op) {
4563 case KD_FONT_OP_SET:
4564 return con_font_set(vc, op);
4565 case KD_FONT_OP_GET:
4566 return con_font_get(vc, op);
4567 case KD_FONT_OP_SET_DEFAULT:
4568 return con_font_default(vc, op);
4569 case KD_FONT_OP_COPY:
4570 return con_font_copy(vc, op);
4571 }
4572 return -ENOSYS;
4573}
4574
4575/*
4576 * Interface exported to selection and vcs.
4577 */
4578
4579/* used by selection */
4580u16 screen_glyph(struct vc_data *vc, int offset)
4581{
4582 u16 w = scr_readw(screenpos(vc, offset, 1));
4583 u16 c = w & 0xff;
4584
4585 if (w & vc->vc_hi_font_mask)
4586 c |= 0x100;
4587 return c;
4588}
f7511d5f 4589EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4 4590
9bfdc261
AB		 4591u32 screen_glyph_unicode(struct vc_data *vc, int n)
4592{
4593 struct uni_screen *uniscr = get_vc_uniscr(vc);
4594
4595 if (uniscr)
4596 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4597 return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4598}
4599EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4600
1da177e4
LT		 4601/* used by vcs - note the word offset */
4602unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4603{
4604 return screenpos(vc, 2 * w_offset, viewed);
4605}
88867e3d 4606EXPORT_SYMBOL_GPL(screen_pos);
1da177e4
LT		 4607
4608void getconsxy(struct vc_data *vc, unsigned char *p)
4609{
4610 p[0] = vc->vc_x;
4611 p[1] = vc->vc_y;
4612}
4613
4614void putconsxy(struct vc_data *vc, unsigned char *p)
4615{
9477e260 4616 hide_cursor(vc);
1da177e4
LT		 4617 gotoxy(vc, p[0], p[1]);
4618 set_cursor(vc);
4619}
4620
4621u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4622{
4623 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4624 return softcursor_original;
4625 return scr_readw(org);
4626}
4627
4628void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4629{
4630 scr_writew(val, org);
4631 if ((unsigned long)org == vc->vc_pos) {
4632 softcursor_original = -1;
4633 add_softcursor(vc);
4634 }
4635}
4636
432c9ed2
NP		 4637void vcs_scr_updated(struct vc_data *vc)
4638{
4639 notify_update(vc);
4640}
4641
35cc56f9
JS		 4642void vc_scrolldelta_helper(struct vc_data *c, int lines,
4643 unsigned int rolled_over, void *base, unsigned int size)
4644{
4645 unsigned long ubase = (unsigned long)base;
210fd746
JS		 4646 ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4647 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4648 ptrdiff_t origin = (void *)c->vc_origin - base;
35cc56f9 4649 int margin = c->vc_size_row * 4;
7c918cdc 4650 int from, wrap, from_off, avail;
35cc56f9
JS		 4651
4652 /* Turn scrollback off */
4653 if (!lines) {
4654 c->vc_visible_origin = c->vc_origin;
4655 return;
4656 }
4657
4658 /* Do we have already enough to allow jumping from 0 to the end? */
210fd746 4659 if (rolled_over > scr_end + margin) {
7c918cdc
JS		 4660 from = scr_end;
4661 wrap = rolled_over + c->vc_size_row;
35cc56f9 4662 } else {
7c918cdc
JS		 4663 from = 0;
4664 wrap = size;
35cc56f9
JS		 4665 }
4666
7c918cdc
JS		 4667 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4668 avail = (origin - from + wrap) % wrap;
35cc56f9
JS		 4669
4670 /* Only a little piece would be left? Show all incl. the piece! */
7c918cdc 4671 if (avail < 2 * margin)
35cc56f9 4672 margin = 0;
7c918cdc
JS		 4673 if (from_off < margin)
4674 from_off = 0;
4675 if (from_off > avail - margin)
4676 from_off = avail;
35cc56f9 4677
7c918cdc 4678 c->vc_visible_origin = ubase + (from + from_off) % wrap;
35cc56f9
JS		 4679}
4680EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4681
1da177e4
LT		 4682/*
4683 * Visible symbols for modules
4684 */
4685
4686EXPORT_SYMBOL(color_table);
4687EXPORT_SYMBOL(default_red);
4688EXPORT_SYMBOL(default_grn);
4689EXPORT_SYMBOL(default_blu);
4690EXPORT_SYMBOL(update_region);
4691EXPORT_SYMBOL(redraw_screen);
4692EXPORT_SYMBOL(vc_resize);
4693EXPORT_SYMBOL(fg_console);
4694EXPORT_SYMBOL(console_blank_hook);
4695EXPORT_SYMBOL(console_blanked);
4696EXPORT_SYMBOL(vc_cons);
f6c06b68 4697EXPORT_SYMBOL(global_cursor_default);
1da177e4 4698#ifndef VT_SINGLE_DRIVER
1da177e4
LT		 4699EXPORT_SYMBOL(give_up_console);
4700#endif
Linux 6.x block layer and io_uring tree(s)