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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
[deliverable/linux.git] / drivers / char / vt.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 62 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
d4328b40
AT		 66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 73 */
74
75#include <linux/module.h>
76#include <linux/types.h>
77#include <linux/sched.h>
78#include <linux/tty.h>
79#include <linux/tty_flip.h>
80#include <linux/kernel.h>
81#include <linux/string.h>
82#include <linux/errno.h>
83#include <linux/kd.h>
84#include <linux/slab.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
c831c338 89#include <linux/mutex.h>
1da177e4
LT		 90#include <linux/vt_kern.h>
91#include <linux/selection.h>
405f5571 92#include <linux/smp_lock.h>
1da177e4
LT		 93#include <linux/tiocl.h>
94#include <linux/kbd_kern.h>
95#include <linux/consolemap.h>
96#include <linux/timer.h>
97#include <linux/interrupt.h>
1da177e4 98#include <linux/workqueue.h>
1da177e4
LT		 99#include <linux/pm.h>
100#include <linux/font.h>
101#include <linux/bitops.h>
b293d758 102#include <linux/notifier.h>
d81ed103
AC		 103#include <linux/device.h>
104#include <linux/io.h>
1da177e4 105#include <asm/system.h>
d81ed103 106#include <linux/uaccess.h>
81d44507 107#include <linux/kdb.h>
74c807ce 108#include <linux/ctype.h>
1da177e4 109
3e795de7 110#define MAX_NR_CON_DRIVER 16
1da177e4 111
6db4063c 112#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
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)
142
1da177e4
LT		 143struct vc vc_cons [MAX_NR_CONSOLES];
144
145#ifndef VT_SINGLE_DRIVER
146static const struct consw *con_driver_map[MAX_NR_CONSOLES];
147#endif
148
149static int con_open(struct tty_struct *, struct file *);
150static void vc_init(struct vc_data *vc, unsigned int rows,
151 unsigned int cols, int do_clear);
152static void gotoxy(struct vc_data *vc, int new_x, int new_y);
153static void save_cur(struct vc_data *vc);
154static void reset_terminal(struct vc_data *vc, int do_clear);
155static void con_flush_chars(struct tty_struct *tty);
403aac96 156static int set_vesa_blanking(char __user *p);
1da177e4
LT		 157static void set_cursor(struct vc_data *vc);
158static void hide_cursor(struct vc_data *vc);
65f27f38 159static void console_callback(struct work_struct *ignored);
1da177e4
LT		 160static void blank_screen_t(unsigned long dummy);
161static void set_palette(struct vc_data *vc);
162
163static int printable; /* Is console ready for printing? */
77bf2bab 164int default_utf8 = true;
042f10ec 165module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 166int global_cursor_default = -1;
167module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 168
9ea9a886
CL		 169static int cur_default = CUR_DEFAULT;
170module_param(cur_default, int, S_IRUGO | S_IWUSR);
171
1da177e4
LT		 172/*
173 * ignore_poke: don't unblank the screen when things are typed. This is
174 * mainly for the privacy of braille terminal users.
175 */
176static int ignore_poke;
177
178int do_poke_blanked_console;
179int console_blanked;
180
181static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 182static int vesa_off_interval;
f324edc8
DM		 183static int blankinterval = 10*60;
184core_param(consoleblank, blankinterval, int, 0444);
1da177e4 185
65f27f38 186static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 187
188/*
189 * fg_console is the current virtual console,
190 * last_console is the last used one,
191 * want_console is the console we want to switch to,
b45cfba4 192 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 193 */
194int fg_console;
195int last_console;
196int want_console = -1;
fed891c8
JW		 197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
beed5336 201static int saved_console_blanked;
1da177e4
LT		 202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
228
40565f19 229static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 230static int blank_state;
231static int blank_timer_expired;
232enum {
233 blank_off = 0,
234 blank_normal_wait,
235 blank_vesa_wait,
236};
237
b293d758
ST		 238/*
239 * Notifier list for console events.
240 */
241static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
242
243int register_vt_notifier(struct notifier_block *nb)
244{
245 return atomic_notifier_chain_register(&vt_notifier_list, nb);
246}
247EXPORT_SYMBOL_GPL(register_vt_notifier);
248
249int unregister_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(unregister_vt_notifier);
254
255static void notify_write(struct vc_data *vc, unsigned int unicode)
256{
257 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
258 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
259}
260
261static void notify_update(struct vc_data *vc)
262{
263 struct vt_notifier_param param = { .vc = vc };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
265}
1da177e4
LT		 266/*
267 * Low-Level Functions
268 */
269
270#define IS_FG(vc) ((vc)->vc_num == fg_console)
271
272#ifdef VT_BUF_VRAM_ONLY
273#define DO_UPDATE(vc) 0
274#else
f700d6e5 275#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 276#endif
277
278static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
279{
280 unsigned short *p;
281
282 if (!viewed)
283 p = (unsigned short *)(vc->vc_origin + offset);
284 else if (!vc->vc_sw->con_screen_pos)
285 p = (unsigned short *)(vc->vc_visible_origin + offset);
286 else
287 p = vc->vc_sw->con_screen_pos(vc, offset);
288 return p;
289}
290
e33ac1c1 291/* Called from the keyboard irq path.. */
1da177e4
LT		 292static inline void scrolldelta(int lines)
293{
e33ac1c1
AC		 294 /* FIXME */
295 /* scrolldelta needs some kind of consistency lock, but the BKL was
296 and still is not protecting versus the scheduled back end */
1da177e4
LT		 297 scrollback_delta += lines;
298 schedule_console_callback();
299}
300
301void schedule_console_callback(void)
302{
303 schedule_work(&console_work);
304}
305
306static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
307{
308 unsigned short *d, *s;
309
310 if (t+nr >= b)
311 nr = b - t - 1;
312 if (b > vc->vc_rows || t >= b || nr < 1)
313 return;
314 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
315 return;
316 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
317 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
318 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 319 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 320 vc->vc_size_row * nr);
321}
322
323static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
324{
325 unsigned short *s;
326 unsigned int step;
327
328 if (t+nr >= b)
329 nr = b - t - 1;
330 if (b > vc->vc_rows || t >= b || nr < 1)
331 return;
332 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
333 return;
334 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
335 step = vc->vc_cols * nr;
336 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 337 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 338}
339
340static void do_update_region(struct vc_data *vc, unsigned long start, int count)
341{
342#ifndef VT_BUF_VRAM_ONLY
343 unsigned int xx, yy, offset;
344 u16 *p;
345
346 p = (u16 *) start;
347 if (!vc->vc_sw->con_getxy) {
348 offset = (start - vc->vc_origin) / 2;
349 xx = offset % vc->vc_cols;
350 yy = offset / vc->vc_cols;
351 } else {
352 int nxx, nyy;
353 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
354 xx = nxx; yy = nyy;
355 }
356 for(;;) {
357 u16 attrib = scr_readw(p) & 0xff00;
358 int startx = xx;
359 u16 *q = p;
360 while (xx < vc->vc_cols && count) {
361 if (attrib != (scr_readw(p) & 0xff00)) {
362 if (p > q)
363 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
364 startx = xx;
365 q = p;
366 attrib = scr_readw(p) & 0xff00;
367 }
368 p++;
369 xx++;
370 count--;
371 }
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 if (!count)
375 break;
376 xx = 0;
377 yy++;
378 if (vc->vc_sw->con_getxy) {
379 p = (u16 *)start;
380 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
381 }
382 }
383#endif
384}
385
386void update_region(struct vc_data *vc, unsigned long start, int count)
387{
388 WARN_CONSOLE_UNLOCKED();
389
390 if (DO_UPDATE(vc)) {
391 hide_cursor(vc);
392 do_update_region(vc, start, count);
393 set_cursor(vc);
394 }
395}
396
397/* Structure of attributes is hardware-dependent */
398
fa6ce9ab
JE		 399static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
400 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 401{
402 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 403 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
404 _blink, _underline, _reverse, _italic);
1da177e4
LT		 405
406#ifndef VT_BUF_VRAM_ONLY
407/*
408 * ++roman: I completely changed the attribute format for monochrome
409 * mode (!can_do_color). The formerly used MDA (monochrome display
410 * adapter) format didn't allow the combination of certain effects.
411 * Now the attribute is just a bit vector:
412 * Bit 0..1: intensity (0..2)
413 * Bit 2 : underline
414 * Bit 3 : reverse
415 * Bit 7 : blink
416 */
417 {
c9e587ab 418 u8 a = _color;
1da177e4
LT		 419 if (!vc->vc_can_do_color)
420 return _intensity |
fa6ce9ab 421 (_italic ? 2 : 0) |
1da177e4
LT		 422 (_underline ? 4 : 0) |
423 (_reverse ? 8 : 0) |
424 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 425 if (_italic)
426 a = (a & 0xF0) | vc->vc_itcolor;
427 else if (_underline)
1da177e4
LT		 428 a = (a & 0xf0) | vc->vc_ulcolor;
429 else if (_intensity == 0)
430 a = (a & 0xf0) | vc->vc_ulcolor;
431 if (_reverse)
432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
433 if (_blink)
434 a ^= 0x80;
435 if (_intensity == 2)
436 a ^= 0x08;
437 if (vc->vc_hi_font_mask == 0x100)
438 a <<= 1;
439 return a;
440 }
441#else
442 return 0;
443#endif
444}
445
446static void update_attr(struct vc_data *vc)
447{
fa6ce9ab
JE		 448 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
449 vc->vc_blink, vc->vc_underline,
450 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
451 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 452}
453
454/* Note: inverting the screen twice should revert to the original state */
455void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
456{
457 unsigned short *p;
458
459 WARN_CONSOLE_UNLOCKED();
460
461 count /= 2;
462 p = screenpos(vc, offset, viewed);
463 if (vc->vc_sw->con_invert_region)
464 vc->vc_sw->con_invert_region(vc, p, count);
465#ifndef VT_BUF_VRAM_ONLY
466 else {
467 u16 *q = p;
468 int cnt = count;
469 u16 a;
470
471 if (!vc->vc_can_do_color) {
472 while (cnt--) {
473 a = scr_readw(q);
474 a ^= 0x0800;
475 scr_writew(a, q);
476 q++;
477 }
478 } else if (vc->vc_hi_font_mask == 0x100) {
479 while (cnt--) {
480 a = scr_readw(q);
481 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
482 scr_writew(a, q);
483 q++;
484 }
485 } else {
486 while (cnt--) {
487 a = scr_readw(q);
488 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
489 scr_writew(a, q);
490 q++;
491 }
492 }
493 }
494#endif
495 if (DO_UPDATE(vc))
496 do_update_region(vc, (unsigned long) p, count);
497}
498
499/* used by selection: complement pointer position */
500void complement_pos(struct vc_data *vc, int offset)
501{
414edcd3 502 static int old_offset = -1;
1da177e4
LT		 503 static unsigned short old;
504 static unsigned short oldx, oldy;
505
506 WARN_CONSOLE_UNLOCKED();
507
414edcd3
AD		 508 if (old_offset != -1 && old_offset >= 0 &&
509 old_offset < vc->vc_screenbuf_size) {
510 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 511 if (DO_UPDATE(vc))
512 vc->vc_sw->con_putc(vc, old, oldy, oldx);
513 }
414edcd3
AD		 514
515 old_offset = offset;
516
517 if (offset != -1 && offset >= 0 &&
518 offset < vc->vc_screenbuf_size) {
1da177e4 519 unsigned short new;
414edcd3 520 unsigned short *p;
1da177e4
LT		 521 p = screenpos(vc, offset, 1);
522 old = scr_readw(p);
523 new = old ^ vc->vc_complement_mask;
524 scr_writew(new, p);
525 if (DO_UPDATE(vc)) {
526 oldx = (offset >> 1) % vc->vc_cols;
527 oldy = (offset >> 1) / vc->vc_cols;
528 vc->vc_sw->con_putc(vc, new, oldy, oldx);
529 }
530 }
414edcd3 531
1da177e4
LT		 532}
533
534static void insert_char(struct vc_data *vc, unsigned int nr)
535{
536 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
537
538 p = q + vc->vc_cols - nr - vc->vc_x;
539 while (--p >= q)
540 scr_writew(scr_readw(p), p + nr);
541 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
542 vc->vc_need_wrap = 0;
543 if (DO_UPDATE(vc)) {
544 unsigned short oldattr = vc->vc_attr;
545 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
546 vc->vc_cols - vc->vc_x - nr);
547 vc->vc_attr = vc->vc_video_erase_char >> 8;
548 while (nr--)
549 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
550 vc->vc_attr = oldattr;
551 }
552}
553
554static void delete_char(struct vc_data *vc, unsigned int nr)
555{
556 unsigned int i = vc->vc_x;
557 unsigned short *p = (unsigned short *)vc->vc_pos;
558
559 while (++i <= vc->vc_cols - nr) {
560 scr_writew(scr_readw(p+nr), p);
561 p++;
562 }
563 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
564 vc->vc_need_wrap = 0;
565 if (DO_UPDATE(vc)) {
566 unsigned short oldattr = vc->vc_attr;
567 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
568 vc->vc_cols - vc->vc_x - nr);
569 vc->vc_attr = vc->vc_video_erase_char >> 8;
570 while (nr--)
571 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
572 vc->vc_cols - 1 - nr);
573 vc->vc_attr = oldattr;
574 }
575}
576
577static int softcursor_original;
578
579static void add_softcursor(struct vc_data *vc)
580{
581 int i = scr_readw((u16 *) vc->vc_pos);
582 u32 type = vc->vc_cursor_type;
583
584 if (! (type & 0x10)) return;
585 if (softcursor_original != -1) return;
586 softcursor_original = i;
587 i |= ((type >> 8) & 0xff00 );
588 i ^= ((type) & 0xff00 );
589 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
590 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
591 scr_writew(i, (u16 *) vc->vc_pos);
592 if (DO_UPDATE(vc))
593 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
594}
595
596static void hide_softcursor(struct vc_data *vc)
597{
598 if (softcursor_original != -1) {
599 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
600 if (DO_UPDATE(vc))
601 vc->vc_sw->con_putc(vc, softcursor_original,
602 vc->vc_y, vc->vc_x);
603 softcursor_original = -1;
604 }
605}
606
607static void hide_cursor(struct vc_data *vc)
608{
609 if (vc == sel_cons)
610 clear_selection();
611 vc->vc_sw->con_cursor(vc, CM_ERASE);
612 hide_softcursor(vc);
613}
614
615static void set_cursor(struct vc_data *vc)
616{
617 if (!IS_FG(vc) || console_blanked ||
618 vc->vc_mode == KD_GRAPHICS)
619 return;
620 if (vc->vc_deccm) {
621 if (vc == sel_cons)
622 clear_selection();
623 add_softcursor(vc);
624 if ((vc->vc_cursor_type & 0x0f) != 1)
625 vc->vc_sw->con_cursor(vc, CM_DRAW);
626 } else
627 hide_cursor(vc);
628}
629
630static void set_origin(struct vc_data *vc)
631{
632 WARN_CONSOLE_UNLOCKED();
633
634 if (!CON_IS_VISIBLE(vc) ||
635 !vc->vc_sw->con_set_origin ||
636 !vc->vc_sw->con_set_origin(vc))
637 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
638 vc->vc_visible_origin = vc->vc_origin;
639 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
640 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
641}
642
643static inline void save_screen(struct vc_data *vc)
644{
645 WARN_CONSOLE_UNLOCKED();
646
647 if (vc->vc_sw->con_save_screen)
648 vc->vc_sw->con_save_screen(vc);
649}
650
651/*
652 * Redrawing of screen
653 */
654
655static void clear_buffer_attributes(struct vc_data *vc)
656{
657 unsigned short *p = (unsigned short *)vc->vc_origin;
658 int count = vc->vc_screenbuf_size / 2;
659 int mask = vc->vc_hi_font_mask | 0xff;
660
661 for (; count > 0; count--, p++) {
662 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
663 }
664}
665
666void redraw_screen(struct vc_data *vc, int is_switch)
667{
668 int redraw = 0;
669
670 WARN_CONSOLE_UNLOCKED();
671
672 if (!vc) {
673 /* strange ... */
674 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
675 return;
676 }
677
678 if (is_switch) {
679 struct vc_data *old_vc = vc_cons[fg_console].d;
680 if (old_vc == vc)
681 return;
682 if (!CON_IS_VISIBLE(vc))
683 redraw = 1;
684 *vc->vc_display_fg = vc;
685 fg_console = vc->vc_num;
686 hide_cursor(old_vc);
687 if (!CON_IS_VISIBLE(old_vc)) {
688 save_screen(old_vc);
689 set_origin(old_vc);
690 }
691 } else {
692 hide_cursor(vc);
693 redraw = 1;
694 }
695
696 if (redraw) {
697 int update;
698 int old_was_color = vc->vc_can_do_color;
699
700 set_origin(vc);
701 update = vc->vc_sw->con_switch(vc);
702 set_palette(vc);
703 /*
704 * If console changed from mono<->color, the best we can do
705 * is to clear the buffer attributes. As it currently stands,
706 * rebuilding new attributes from the old buffer is not doable
707 * without overly complex code.
708 */
709 if (old_was_color != vc->vc_can_do_color) {
710 update_attr(vc);
711 clear_buffer_attributes(vc);
712 }
8fd4bd22
JB		 713
714 /* Forcibly update if we're panicing */
715 if ((update && vc->vc_mode != KD_GRAPHICS) ||
716 vt_force_oops_output(vc))
1da177e4
LT		 717 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
718 }
719 set_cursor(vc);
720 if (is_switch) {
721 set_leds();
722 compute_shiftstate();
8182ec49 723 notify_update(vc);
1da177e4
LT		 724 }
725}
726
727/*
728 * Allocation, freeing and resizing of VTs.
729 */
730
731int vc_cons_allocated(unsigned int i)
732{
733 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
734}
735
736static void visual_init(struct vc_data *vc, int num, int init)
737{
738 /* ++Geert: vc->vc_sw->con_init determines console size */
739 if (vc->vc_sw)
740 module_put(vc->vc_sw->owner);
741 vc->vc_sw = conswitchp;
742#ifndef VT_SINGLE_DRIVER
743 if (con_driver_map[num])
744 vc->vc_sw = con_driver_map[num];
745#endif
746 __module_get(vc->vc_sw->owner);
747 vc->vc_num = num;
748 vc->vc_display_fg = &master_display_fg;
749 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
750 vc->vc_uni_pagedir = 0;
751 vc->vc_hi_font_mask = 0;
752 vc->vc_complement_mask = 0;
753 vc->vc_can_do_color = 0;
8fd4bd22 754 vc->vc_panic_force_write = false;
1da177e4
LT		 755 vc->vc_sw->con_init(vc, init);
756 if (!vc->vc_complement_mask)
757 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
758 vc->vc_s_complement_mask = vc->vc_complement_mask;
759 vc->vc_size_row = vc->vc_cols << 1;
760 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
761}
762
763int vc_allocate(unsigned int currcons) /* return 0 on success */
764{
765 WARN_CONSOLE_UNLOCKED();
766
767 if (currcons >= MAX_NR_CONSOLES)
768 return -ENXIO;
769 if (!vc_cons[currcons].d) {
770 struct vc_data *vc;
b293d758 771 struct vt_notifier_param param;
1da177e4
LT		 772
773 /* prevent users from taking too much memory */
774 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
775 return -EPERM;
776
777 /* due to the granularity of kmalloc, we waste some memory here */
778 /* the alloc is done in two steps, to optimize the common situation
779 of a 25x80 console (structsize=216, screenbuf_size=4000) */
780 /* although the numbers above are not valid since long ago, the
781 point is still up-to-date and the comment still has its value
782 even if only as a historical artifact. --mj, July 1998 */
b293d758 783 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 784 if (!vc)
785 return -ENOMEM;
1da177e4 786 vc_cons[currcons].d = vc;
ff917ba4 787 tty_port_init(&vc->port);
c2c88f10 788 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 789 visual_init(vc, currcons, 1);
790 if (!*vc->vc_uni_pagedir_loc)
791 con_set_default_unimap(vc);
5c9228f0 792 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 793 if (!vc->vc_screenbuf) {
794 kfree(vc);
795 vc_cons[currcons].d = NULL;
796 return -ENOMEM;
797 }
f6c06b68
MG		 798
799 /* If no drivers have overridden us and the user didn't pass a
800 boot option, default to displaying the cursor */
801 if (global_cursor_default == -1)
802 global_cursor_default = 1;
803
1da177e4 804 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 805 vcs_make_sysfs(currcons);
b293d758 806 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 807 }
808 return 0;
809}
810
e400b6ec
AD		 811static inline int resize_screen(struct vc_data *vc, int width, int height,
812 int user)
1da177e4
LT		 813{
814 /* Resizes the resolution of the display adapater */
815 int err = 0;
816
817 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 818 err = vc->vc_sw->con_resize(vc, width, height, user);
819
1da177e4
LT		 820 return err;
821}
822
823/*
824 * Change # of rows and columns (0 means unchanged/the size of fg_console)
825 * [this is to be used together with some user program
826 * like resize that changes the hardware videomode]
827 */
828#define VC_RESIZE_MAXCOL (32767)
829#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 830
831/**
832 * vc_do_resize - resizing method for the tty
833 * @tty: tty being resized
834 * @real_tty: real tty (different to tty if a pty/tty pair)
835 * @vc: virtual console private data
836 * @cols: columns
837 * @lines: lines
838 *
839 * Resize a virtual console, clipping according to the actual constraints.
840 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 841 * information and perform any necessary signal handling.
8c9a9dd0
AC		 842 *
843 * Caller must hold the console semaphore. Takes the termios mutex and
844 * ctrl_lock of the tty IFF a tty is passed.
845 */
846
fc6f6238
AC		 847static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
848 unsigned int cols, unsigned int lines)
1da177e4
LT		 849{
850 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 851 unsigned long end;
1da177e4
LT		 852 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
853 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 854 unsigned int user;
1da177e4
LT		 855 unsigned short *newscreen;
856
857 WARN_CONSOLE_UNLOCKED();
858
859 if (!vc)
860 return -ENXIO;
861
e400b6ec
AD		 862 user = vc->vc_resize_user;
863 vc->vc_resize_user = 0;
864
1da177e4
LT		 865 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
866 return -EINVAL;
867
868 new_cols = (cols ? cols : vc->vc_cols);
869 new_rows = (lines ? lines : vc->vc_rows);
870 new_row_size = new_cols << 1;
871 new_screen_size = new_row_size * new_rows;
872
873 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
874 return 0;
875
5cbded58 876 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 877 if (!newscreen)
878 return -ENOMEM;
879
880 old_rows = vc->vc_rows;
881 old_cols = vc->vc_cols;
882 old_row_size = vc->vc_size_row;
883 old_screen_size = vc->vc_screenbuf_size;
884
e400b6ec 885 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 886 if (err) {
887 kfree(newscreen);
888 return err;
889 }
890
891 vc->vc_rows = new_rows;
892 vc->vc_cols = new_cols;
893 vc->vc_size_row = new_row_size;
894 vc->vc_screenbuf_size = new_screen_size;
895
896 rlth = min(old_row_size, new_row_size);
897 rrem = new_row_size - rlth;
898 old_origin = vc->vc_origin;
899 new_origin = (long) newscreen;
900 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 901
902 if (vc->vc_y > new_rows) {
903 if (old_rows - vc->vc_y < new_rows) {
904 /*
905 * Cursor near the bottom, copy contents from the
906 * bottom of buffer
907 */
908 old_origin += (old_rows - new_rows) * old_row_size;
909 end = vc->vc_scr_end;
910 } else {
911 /*
912 * Cursor is in no man's land, copy 1/2 screenful
913 * from the top and bottom of cursor position
914 */
915 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 916 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 917 }
918 } else
919 /*
920 * Cursor near the top, copy contents from the top of buffer
921 */
065d9cac
AD		 922 end = (old_rows > new_rows) ? old_origin +
923 (old_row_size * new_rows) :
3b41dc1a 924 vc->vc_scr_end;
1da177e4
LT		 925
926 update_attr(vc);
927
3b41dc1a
AD		 928 while (old_origin < end) {
929 scr_memcpyw((unsigned short *) new_origin,
930 (unsigned short *) old_origin, rlth);
1da177e4 931 if (rrem)
3b41dc1a
AD		 932 scr_memsetw((void *)(new_origin + rlth),
933 vc->vc_video_erase_char, rrem);
1da177e4
LT		 934 old_origin += old_row_size;
935 new_origin += new_row_size;
936 }
937 if (new_scr_end > new_origin)
3b41dc1a
AD		 938 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
939 new_scr_end - new_origin);
5c9228f0 940 kfree(vc->vc_screenbuf);
1da177e4 941 vc->vc_screenbuf = newscreen;
1da177e4
LT		 942 vc->vc_screenbuf_size = new_screen_size;
943 set_origin(vc);
944
945 /* do part of a reset_terminal() */
946 vc->vc_top = 0;
947 vc->vc_bottom = vc->vc_rows;
948 gotoxy(vc, vc->vc_x, vc->vc_y);
949 save_cur(vc);
950
8c9a9dd0
AC		 951 if (tty) {
952 /* Rewrite the requested winsize data with the actual
953 resulting sizes */
954 struct winsize ws;
1da177e4
LT		 955 memset(&ws, 0, sizeof(ws));
956 ws.ws_row = vc->vc_rows;
957 ws.ws_col = vc->vc_cols;
958 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 959 tty_do_resize(tty, &ws);
1da177e4
LT		 960 }
961
962 if (CON_IS_VISIBLE(vc))
963 update_screen(vc);
8b92e87d 964 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 965 return err;
966}
967
8c9a9dd0
AC		 968/**
969 * vc_resize - resize a VT
970 * @vc: virtual console
971 * @cols: columns
972 * @rows: rows
973 *
974 * Resize a virtual console as seen from the console end of things. We
975 * use the common vc_do_resize methods to update the structures. The
976 * caller must hold the console sem to protect console internals and
8ce73264 977 * vc->port.tty
8c9a9dd0
AC		 978 */
979
980int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
981{
8ce73264 982 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 983}
984
985/**
986 * vt_resize - resize a VT
987 * @tty: tty to resize
8c9a9dd0
AC		 988 * @ws: winsize attributes
989 *
990 * Resize a virtual terminal. This is called by the tty layer as we
991 * register our own handler for resizing. The mutual helper does all
992 * the actual work.
993 *
994 * Takes the console sem and the called methods then take the tty
995 * termios_mutex and the tty ctrl_lock in that order.
996 */
da2bdf9a 997static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 998{
8c9a9dd0
AC		 999 struct vc_data *vc = tty->driver_data;
1000 int ret;
ca9bda00
AC		 1001
1002 acquire_console_sem();
fc6f6238 1003 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ca9bda00 1004 release_console_sem();
8c9a9dd0 1005 return ret;
ca9bda00 1006}
1da177e4 1007
ca9bda00 1008void vc_deallocate(unsigned int currcons)
1da177e4
LT		 1009{
1010 WARN_CONSOLE_UNLOCKED();
1011
1012 if (vc_cons_allocated(currcons)) {
1013 struct vc_data *vc = vc_cons[currcons].d;
b293d758 1014 struct vt_notifier_param param = { .vc = vc };
4995f8ef 1015
b293d758 1016 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1017 vcs_remove_sysfs(currcons);
1da177e4 1018 vc->vc_sw->con_deinit(vc);
bde0d2c9 1019 put_pid(vc->vt_pid);
d459ec0b 1020 module_put(vc->vc_sw->owner);
5c9228f0 1021 kfree(vc->vc_screenbuf);
1da177e4
LT		 1022 if (currcons >= MIN_NR_CONSOLES)
1023 kfree(vc);
1024 vc_cons[currcons].d = NULL;
1025 }
1026}
1027
1028/*
1029 * VT102 emulator
1030 */
1031
1032#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1033#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1034#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1035
1036#define decarm VC_REPEAT
1037#define decckm VC_CKMODE
1038#define kbdapplic VC_APPLIC
1039#define lnm VC_CRLF
1040
1041/*
1042 * this is what the terminal answers to a ESC-Z or csi0c query.
1043 */
1044#define VT100ID "\033[?1;2c"
1045#define VT102ID "\033[?6c"
1046
1047unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1048 8,12,10,14, 9,13,11,15 };
1049
1050/* the default colour table, for VGA+ colour systems */
1051int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1052 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1053int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1054 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1055int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1056 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1057
1c2bbe6a
JE		 1058module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1059module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1060module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1061
1da177e4
LT		 1062/*
1063 * gotoxy() must verify all boundaries, because the arguments
1064 * might also be negative. If the given position is out of
1065 * bounds, the cursor is placed at the nearest margin.
1066 */
1067static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1068{
1069 int min_y, max_y;
1070
1071 if (new_x < 0)
1072 vc->vc_x = 0;
1073 else {
1074 if (new_x >= vc->vc_cols)
1075 vc->vc_x = vc->vc_cols - 1;
1076 else
1077 vc->vc_x = new_x;
1078 }
1079
1080 if (vc->vc_decom) {
1081 min_y = vc->vc_top;
1082 max_y = vc->vc_bottom;
1083 } else {
1084 min_y = 0;
1085 max_y = vc->vc_rows;
1086 }
1087 if (new_y < min_y)
1088 vc->vc_y = min_y;
1089 else if (new_y >= max_y)
1090 vc->vc_y = max_y - 1;
1091 else
1092 vc->vc_y = new_y;
1093 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1094 vc->vc_need_wrap = 0;
1095}
1096
1097/* for absolute user moves, when decom is set */
1098static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1099{
1100 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1101}
1102
1103void scrollback(struct vc_data *vc, int lines)
1104{
1105 if (!lines)
1106 lines = vc->vc_rows / 2;
1107 scrolldelta(-lines);
1108}
1109
1110void scrollfront(struct vc_data *vc, int lines)
1111{
1112 if (!lines)
1113 lines = vc->vc_rows / 2;
1114 scrolldelta(lines);
1115}
1116
1117static void lf(struct vc_data *vc)
1118{
1119 /* don't scroll if above bottom of scrolling region, or
1120 * if below scrolling region
1121 */
1122 if (vc->vc_y + 1 == vc->vc_bottom)
1123 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1124 else if (vc->vc_y < vc->vc_rows - 1) {
1125 vc->vc_y++;
1126 vc->vc_pos += vc->vc_size_row;
1127 }
1128 vc->vc_need_wrap = 0;
b293d758 1129 notify_write(vc, '\n');
1da177e4
LT		 1130}
1131
1132static void ri(struct vc_data *vc)
1133{
1134 /* don't scroll if below top of scrolling region, or
1135 * if above scrolling region
1136 */
1137 if (vc->vc_y == vc->vc_top)
1138 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1139 else if (vc->vc_y > 0) {
1140 vc->vc_y--;
1141 vc->vc_pos -= vc->vc_size_row;
1142 }
1143 vc->vc_need_wrap = 0;
1144}
1145
1146static inline void cr(struct vc_data *vc)
1147{
1148 vc->vc_pos -= vc->vc_x << 1;
1149 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1150 notify_write(vc, '\r');
1da177e4
LT		 1151}
1152
1153static inline void bs(struct vc_data *vc)
1154{
1155 if (vc->vc_x) {
1156 vc->vc_pos -= 2;
1157 vc->vc_x--;
1158 vc->vc_need_wrap = 0;
b293d758 1159 notify_write(vc, '\b');
1da177e4
LT		 1160 }
1161}
1162
1163static inline void del(struct vc_data *vc)
1164{
1165 /* ignored */
1166}
1167
1168static void csi_J(struct vc_data *vc, int vpar)
1169{
1170 unsigned int count;
1171 unsigned short * start;
1172
1173 switch (vpar) {
1174 case 0: /* erase from cursor to end of display */
1175 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1176 start = (unsigned short *)vc->vc_pos;
1177 if (DO_UPDATE(vc)) {
1178 /* do in two stages */
1179 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1180 vc->vc_cols - vc->vc_x);
1181 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1182 vc->vc_rows - vc->vc_y - 1,
1183 vc->vc_cols);
1184 }
1185 break;
1186 case 1: /* erase from start to cursor */
1187 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1188 start = (unsigned short *)vc->vc_origin;
1189 if (DO_UPDATE(vc)) {
1190 /* do in two stages */
1191 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1192 vc->vc_cols);
1193 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1194 vc->vc_x + 1);
1195 }
1196 break;
1197 case 2: /* erase whole display */
1198 count = vc->vc_cols * vc->vc_rows;
1199 start = (unsigned short *)vc->vc_origin;
1200 if (DO_UPDATE(vc))
1201 vc->vc_sw->con_clear(vc, 0, 0,
1202 vc->vc_rows,
1203 vc->vc_cols);
1204 break;
1205 default:
1206 return;
1207 }
1208 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1209 vc->vc_need_wrap = 0;
1210}
1211
1212static void csi_K(struct vc_data *vc, int vpar)
1213{
1214 unsigned int count;
1215 unsigned short * start;
1216
1217 switch (vpar) {
1218 case 0: /* erase from cursor to end of line */
1219 count = vc->vc_cols - vc->vc_x;
1220 start = (unsigned short *)vc->vc_pos;
1221 if (DO_UPDATE(vc))
1222 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1223 vc->vc_cols - vc->vc_x);
1224 break;
1225 case 1: /* erase from start of line to cursor */
1226 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1227 count = vc->vc_x + 1;
1228 if (DO_UPDATE(vc))
1229 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1230 vc->vc_x + 1);
1231 break;
1232 case 2: /* erase whole line */
1233 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1234 count = vc->vc_cols;
1235 if (DO_UPDATE(vc))
1236 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1237 vc->vc_cols);
1238 break;
1239 default:
1240 return;
1241 }
1242 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1243 vc->vc_need_wrap = 0;
1244}
1245
1246static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1247{ /* not vt100? */
1248 int count;
1249
1250 if (!vpar)
1251 vpar++;
1252 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1253
1254 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1255 if (DO_UPDATE(vc))
1256 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1257 vc->vc_need_wrap = 0;
1258}
1259
1260static void default_attr(struct vc_data *vc)
1261{
1262 vc->vc_intensity = 1;
fa6ce9ab 1263 vc->vc_italic = 0;
1da177e4
LT		 1264 vc->vc_underline = 0;
1265 vc->vc_reverse = 0;
1266 vc->vc_blink = 0;
1267 vc->vc_color = vc->vc_def_color;
1268}
1269
1270/* console_sem is held */
1271static void csi_m(struct vc_data *vc)
1272{
1273 int i;
1274
1275 for (i = 0; i <= vc->vc_npar; i++)
1276 switch (vc->vc_par[i]) {
1277 case 0: /* all attributes off */
1278 default_attr(vc);
1279 break;
1280 case 1:
1281 vc->vc_intensity = 2;
1282 break;
1283 case 2:
1284 vc->vc_intensity = 0;
1285 break;
fa6ce9ab
JE		 1286 case 3:
1287 vc->vc_italic = 1;
1288 break;
1da177e4
LT		 1289 case 4:
1290 vc->vc_underline = 1;
1291 break;
1292 case 5:
1293 vc->vc_blink = 1;
1294 break;
1295 case 7:
1296 vc->vc_reverse = 1;
1297 break;
1298 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1299 * Select primary font, don't display
1300 * control chars if defined, don't set
1301 * bit 8 on output.
1302 */
1303 vc->vc_translate = set_translate(vc->vc_charset == 0
1304 ? vc->vc_G0_charset
1305 : vc->vc_G1_charset, vc);
1306 vc->vc_disp_ctrl = 0;
1307 vc->vc_toggle_meta = 0;
1308 break;
1309 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1310 * Select first alternate font, lets
1311 * chars < 32 be displayed as ROM chars.
1312 */
1313 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1314 vc->vc_disp_ctrl = 1;
1315 vc->vc_toggle_meta = 0;
1316 break;
1317 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1318 * Select second alternate font, toggle
1319 * high bit before displaying as ROM char.
1320 */
1321 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1322 vc->vc_disp_ctrl = 1;
1323 vc->vc_toggle_meta = 1;
1324 break;
1325 case 21:
1326 case 22:
1327 vc->vc_intensity = 1;
1328 break;
fa6ce9ab
JE		 1329 case 23:
1330 vc->vc_italic = 0;
1331 break;
1da177e4
LT		 1332 case 24:
1333 vc->vc_underline = 0;
1334 break;
1335 case 25:
1336 vc->vc_blink = 0;
1337 break;
1338 case 27:
1339 vc->vc_reverse = 0;
1340 break;
1341 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1342 * Enables underscore, white foreground
1343 * with white underscore (Linux - use
1344 * default foreground).
1345 */
1346 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1347 vc->vc_underline = 1;
1348 break;
1349 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1350 * Disable underline option.
1351 * Reset colour to default? It did this
1352 * before...
1353 */
1354 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1355 vc->vc_underline = 0;
1356 break;
1357 case 49:
1358 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1359 break;
1360 default:
1361 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1362 vc->vc_color = color_table[vc->vc_par[i] - 30]
1363 | (vc->vc_color & 0xf0);
1364 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1365 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1366 | (vc->vc_color & 0x0f);
1367 break;
1368 }
1369 update_attr(vc);
1370}
1371
1372static void respond_string(const char *p, struct tty_struct *tty)
1373{
1374 while (*p) {
1375 tty_insert_flip_char(tty, *p, 0);
1376 p++;
1377 }
1378 con_schedule_flip(tty);
1379}
1380
1381static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1382{
1383 char buf[40];
1384
1385 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1386 respond_string(buf, tty);
1387}
1388
1389static inline void status_report(struct tty_struct *tty)
1390{
1391 respond_string("\033[0n", tty); /* Terminal ok */
1392}
1393
1394static inline void respond_ID(struct tty_struct * tty)
1395{
1396 respond_string(VT102ID, tty);
1397}
1398
1399void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1400{
1401 char buf[8];
1402
1403 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1404 (char)('!' + mry));
1405 respond_string(buf, tty);
1406}
1407
1408/* invoked via ioctl(TIOCLINUX) and through set_selection */
1409int mouse_reporting(void)
1410{
1411 return vc_cons[fg_console].d->vc_report_mouse;
1412}
1413
1414/* console_sem is held */
1415static void set_mode(struct vc_data *vc, int on_off)
1416{
1417 int i;
1418
1419 for (i = 0; i <= vc->vc_npar; i++)
1420 if (vc->vc_ques) {
1421 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1422 case 1: /* Cursor keys send ^[Ox/^[[x */
1423 if (on_off)
1424 set_kbd(vc, decckm);
1425 else
1426 clr_kbd(vc, decckm);
1427 break;
1428 case 3: /* 80/132 mode switch unimplemented */
1429 vc->vc_deccolm = on_off;
1430#if 0
1431 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1432 /* this alone does not suffice; some user mode
1433 utility has to change the hardware regs */
1434#endif
1435 break;
1436 case 5: /* Inverted screen on/off */
1437 if (vc->vc_decscnm != on_off) {
1438 vc->vc_decscnm = on_off;
1439 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1440 update_attr(vc);
1441 }
1442 break;
1443 case 6: /* Origin relative/absolute */
1444 vc->vc_decom = on_off;
1445 gotoxay(vc, 0, 0);
1446 break;
1447 case 7: /* Autowrap on/off */
1448 vc->vc_decawm = on_off;
1449 break;
1450 case 8: /* Autorepeat on/off */
1451 if (on_off)
1452 set_kbd(vc, decarm);
1453 else
1454 clr_kbd(vc, decarm);
1455 break;
1456 case 9:
1457 vc->vc_report_mouse = on_off ? 1 : 0;
1458 break;
1459 case 25: /* Cursor on/off */
1460 vc->vc_deccm = on_off;
1461 break;
1462 case 1000:
1463 vc->vc_report_mouse = on_off ? 2 : 0;
1464 break;
1465 }
1466 } else {
1467 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1468 case 3: /* Monitor (display ctrls) */
1469 vc->vc_disp_ctrl = on_off;
1470 break;
1471 case 4: /* Insert Mode on/off */
1472 vc->vc_decim = on_off;
1473 break;
1474 case 20: /* Lf, Enter == CrLf/Lf */
1475 if (on_off)
1476 set_kbd(vc, lnm);
1477 else
1478 clr_kbd(vc, lnm);
1479 break;
1480 }
1481 }
1482}
1483
1484/* console_sem is held */
1485static void setterm_command(struct vc_data *vc)
1486{
1487 switch(vc->vc_par[0]) {
1488 case 1: /* set color for underline mode */
1489 if (vc->vc_can_do_color &&
1490 vc->vc_par[1] < 16) {
1491 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1492 if (vc->vc_underline)
1493 update_attr(vc);
1494 }
1495 break;
1496 case 2: /* set color for half intensity mode */
1497 if (vc->vc_can_do_color &&
1498 vc->vc_par[1] < 16) {
1499 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1500 if (vc->vc_intensity == 0)
1501 update_attr(vc);
1502 }
1503 break;
1504 case 8: /* store colors as defaults */
1505 vc->vc_def_color = vc->vc_attr;
1506 if (vc->vc_hi_font_mask == 0x100)
1507 vc->vc_def_color >>= 1;
1508 default_attr(vc);
1509 update_attr(vc);
1510 break;
1511 case 9: /* set blanking interval */
f324edc8 1512 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1513 poke_blanked_console();
1514 break;
1515 case 10: /* set bell frequency in Hz */
1516 if (vc->vc_npar >= 1)
1517 vc->vc_bell_pitch = vc->vc_par[1];
1518 else
1519 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1520 break;
1521 case 11: /* set bell duration in msec */
1522 if (vc->vc_npar >= 1)
1523 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1524 vc->vc_par[1] * HZ / 1000 : 0;
1525 else
1526 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1527 break;
1528 case 12: /* bring specified console to the front */
1529 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1530 set_console(vc->vc_par[1] - 1);
1531 break;
1532 case 13: /* unblank the screen */
1533 poke_blanked_console();
1534 break;
1535 case 14: /* set vesa powerdown interval */
1536 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1537 break;
1538 case 15: /* activate the previous console */
1539 set_console(last_console);
1540 break;
1541 }
1542}
1543
1544/* console_sem is held */
1545static void csi_at(struct vc_data *vc, unsigned int nr)
1546{
1547 if (nr > vc->vc_cols - vc->vc_x)
1548 nr = vc->vc_cols - vc->vc_x;
1549 else if (!nr)
1550 nr = 1;
1551 insert_char(vc, nr);
1552}
1553
1554/* console_sem is held */
1555static void csi_L(struct vc_data *vc, unsigned int nr)
1556{
1557 if (nr > vc->vc_rows - vc->vc_y)
1558 nr = vc->vc_rows - vc->vc_y;
1559 else if (!nr)
1560 nr = 1;
1561 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1562 vc->vc_need_wrap = 0;
1563}
1564
1565/* console_sem is held */
1566static void csi_P(struct vc_data *vc, unsigned int nr)
1567{
1568 if (nr > vc->vc_cols - vc->vc_x)
1569 nr = vc->vc_cols - vc->vc_x;
1570 else if (!nr)
1571 nr = 1;
1572 delete_char(vc, nr);
1573}
1574
1575/* console_sem is held */
1576static void csi_M(struct vc_data *vc, unsigned int nr)
1577{
1578 if (nr > vc->vc_rows - vc->vc_y)
1579 nr = vc->vc_rows - vc->vc_y;
1580 else if (!nr)
1581 nr=1;
1582 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1583 vc->vc_need_wrap = 0;
1584}
1585
1586/* console_sem is held (except via vc_init->reset_terminal */
1587static void save_cur(struct vc_data *vc)
1588{
1589 vc->vc_saved_x = vc->vc_x;
1590 vc->vc_saved_y = vc->vc_y;
1591 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1592 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1593 vc->vc_s_underline = vc->vc_underline;
1594 vc->vc_s_blink = vc->vc_blink;
1595 vc->vc_s_reverse = vc->vc_reverse;
1596 vc->vc_s_charset = vc->vc_charset;
1597 vc->vc_s_color = vc->vc_color;
1598 vc->vc_saved_G0 = vc->vc_G0_charset;
1599 vc->vc_saved_G1 = vc->vc_G1_charset;
1600}
1601
1602/* console_sem is held */
1603static void restore_cur(struct vc_data *vc)
1604{
1605 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1606 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1607 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1608 vc->vc_underline = vc->vc_s_underline;
1609 vc->vc_blink = vc->vc_s_blink;
1610 vc->vc_reverse = vc->vc_s_reverse;
1611 vc->vc_charset = vc->vc_s_charset;
1612 vc->vc_color = vc->vc_s_color;
1613 vc->vc_G0_charset = vc->vc_saved_G0;
1614 vc->vc_G1_charset = vc->vc_saved_G1;
1615 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1616 update_attr(vc);
1617 vc->vc_need_wrap = 0;
1618}
1619
1620enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1621 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1622 ESpalette };
1623
1624/* console_sem is held (except via vc_init()) */
1625static void reset_terminal(struct vc_data *vc, int do_clear)
1626{
1627 vc->vc_top = 0;
1628 vc->vc_bottom = vc->vc_rows;
1629 vc->vc_state = ESnormal;
1630 vc->vc_ques = 0;
1631 vc->vc_translate = set_translate(LAT1_MAP, vc);
1632 vc->vc_G0_charset = LAT1_MAP;
1633 vc->vc_G1_charset = GRAF_MAP;
1634 vc->vc_charset = 0;
1635 vc->vc_need_wrap = 0;
1636 vc->vc_report_mouse = 0;
042f10ec 1637 vc->vc_utf = default_utf8;
1da177e4
LT		 1638 vc->vc_utf_count = 0;
1639
1640 vc->vc_disp_ctrl = 0;
1641 vc->vc_toggle_meta = 0;
1642
1643 vc->vc_decscnm = 0;
1644 vc->vc_decom = 0;
1645 vc->vc_decawm = 1;
f6c06b68 1646 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1647 vc->vc_decim = 0;
1648
1649 set_kbd(vc, decarm);
1650 clr_kbd(vc, decckm);
1651 clr_kbd(vc, kbdapplic);
1652 clr_kbd(vc, lnm);
1653 kbd_table[vc->vc_num].lockstate = 0;
1654 kbd_table[vc->vc_num].slockstate = 0;
1655 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1656 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1657 /* do not do set_leds here because this causes an endless tasklet loop
1658 when the keyboard hasn't been initialized yet */
1659
9ea9a886 1660 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1661 vc->vc_complement_mask = vc->vc_s_complement_mask;
1662
1663 default_attr(vc);
1664 update_attr(vc);
1665
1666 vc->vc_tab_stop[0] = 0x01010100;
1667 vc->vc_tab_stop[1] =
1668 vc->vc_tab_stop[2] =
1669 vc->vc_tab_stop[3] =
a564738c
WK		 1670 vc->vc_tab_stop[4] =
1671 vc->vc_tab_stop[5] =
1672 vc->vc_tab_stop[6] =
1673 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1674
1675 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1676 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1677
1678 gotoxy(vc, 0, 0);
1679 save_cur(vc);
1680 if (do_clear)
1681 csi_J(vc, 2);
1682}
1683
1684/* console_sem is held */
1685static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1686{
1687 /*
1688 * Control characters can be used in the _middle_
1689 * of an escape sequence.
1690 */
1691 switch (c) {
1692 case 0:
1693 return;
1694 case 7:
1695 if (vc->vc_bell_duration)
1696 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1697 return;
1698 case 8:
1699 bs(vc);
1700 return;
1701 case 9:
1702 vc->vc_pos -= (vc->vc_x << 1);
1703 while (vc->vc_x < vc->vc_cols - 1) {
1704 vc->vc_x++;
1705 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1706 break;
1707 }
1708 vc->vc_pos += (vc->vc_x << 1);
b293d758 1709 notify_write(vc, '\t');
1da177e4
LT		 1710 return;
1711 case 10: case 11: case 12:
1712 lf(vc);
1713 if (!is_kbd(vc, lnm))
1714 return;
1715 case 13:
1716 cr(vc);
1717 return;
1718 case 14:
1719 vc->vc_charset = 1;
1720 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1721 vc->vc_disp_ctrl = 1;
1722 return;
1723 case 15:
1724 vc->vc_charset = 0;
1725 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1726 vc->vc_disp_ctrl = 0;
1727 return;
1728 case 24: case 26:
1729 vc->vc_state = ESnormal;
1730 return;
1731 case 27:
1732 vc->vc_state = ESesc;
1733 return;
1734 case 127:
1735 del(vc);
1736 return;
1737 case 128+27:
1738 vc->vc_state = ESsquare;
1739 return;
1740 }
1741 switch(vc->vc_state) {
1742 case ESesc:
1743 vc->vc_state = ESnormal;
1744 switch (c) {
1745 case '[':
1746 vc->vc_state = ESsquare;
1747 return;
1748 case ']':
1749 vc->vc_state = ESnonstd;
1750 return;
1751 case '%':
1752 vc->vc_state = ESpercent;
1753 return;
1754 case 'E':
1755 cr(vc);
1756 lf(vc);
1757 return;
1758 case 'M':
1759 ri(vc);
1760 return;
1761 case 'D':
1762 lf(vc);
1763 return;
1764 case 'H':
1765 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1766 return;
1767 case 'Z':
1768 respond_ID(tty);
1769 return;
1770 case '7':
1771 save_cur(vc);
1772 return;
1773 case '8':
1774 restore_cur(vc);
1775 return;
1776 case '(':
1777 vc->vc_state = ESsetG0;
1778 return;
1779 case ')':
1780 vc->vc_state = ESsetG1;
1781 return;
1782 case '#':
1783 vc->vc_state = EShash;
1784 return;
1785 case 'c':
1786 reset_terminal(vc, 1);
1787 return;
1788 case '>': /* Numeric keypad */
1789 clr_kbd(vc, kbdapplic);
1790 return;
1791 case '=': /* Appl. keypad */
1792 set_kbd(vc, kbdapplic);
1793 return;
1794 }
1795 return;
1796 case ESnonstd:
1797 if (c=='P') { /* palette escape sequence */
1798 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1799 vc->vc_par[vc->vc_npar] = 0;
1800 vc->vc_npar = 0;
1801 vc->vc_state = ESpalette;
1802 return;
1803 } else if (c=='R') { /* reset palette */
1804 reset_palette(vc);
1805 vc->vc_state = ESnormal;
1806 } else
1807 vc->vc_state = ESnormal;
1808 return;
1809 case ESpalette:
74c807ce
AS		 1810 if (isxdigit(c)) {
1811 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1812 if (vc->vc_npar == 7) {
1813 int i = vc->vc_par[0] * 3, j = 1;
1814 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1815 vc->vc_palette[i++] += vc->vc_par[j++];
1816 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1817 vc->vc_palette[i++] += vc->vc_par[j++];
1818 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1819 vc->vc_palette[i] += vc->vc_par[j];
1820 set_palette(vc);
1821 vc->vc_state = ESnormal;
1822 }
1823 } else
1824 vc->vc_state = ESnormal;
1825 return;
1826 case ESsquare:
1827 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1828 vc->vc_par[vc->vc_npar] = 0;
1829 vc->vc_npar = 0;
1830 vc->vc_state = ESgetpars;
1831 if (c == '[') { /* Function key */
1832 vc->vc_state=ESfunckey;
1833 return;
1834 }
1835 vc->vc_ques = (c == '?');
1836 if (vc->vc_ques)
1837 return;
1838 case ESgetpars:
1839 if (c == ';' && vc->vc_npar < NPAR - 1) {
1840 vc->vc_npar++;
1841 return;
1842 } else if (c>='0' && c<='9') {
1843 vc->vc_par[vc->vc_npar] *= 10;
1844 vc->vc_par[vc->vc_npar] += c - '0';
1845 return;
1846 } else
1847 vc->vc_state = ESgotpars;
1848 case ESgotpars:
1849 vc->vc_state = ESnormal;
1850 switch(c) {
1851 case 'h':
1852 set_mode(vc, 1);
1853 return;
1854 case 'l':
1855 set_mode(vc, 0);
1856 return;
1857 case 'c':
1858 if (vc->vc_ques) {
1859 if (vc->vc_par[0])
1860 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1861 else
9ea9a886 1862 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1863 return;
1864 }
1865 break;
1866 case 'm':
1867 if (vc->vc_ques) {
1868 clear_selection();
1869 if (vc->vc_par[0])
1870 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1871 else
1872 vc->vc_complement_mask = vc->vc_s_complement_mask;
1873 return;
1874 }
1875 break;
1876 case 'n':
1877 if (!vc->vc_ques) {
1878 if (vc->vc_par[0] == 5)
1879 status_report(tty);
1880 else if (vc->vc_par[0] == 6)
1881 cursor_report(vc, tty);
1882 }
1883 return;
1884 }
1885 if (vc->vc_ques) {
1886 vc->vc_ques = 0;
1887 return;
1888 }
1889 switch(c) {
1890 case 'G': case '`':
1891 if (vc->vc_par[0])
1892 vc->vc_par[0]--;
1893 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1894 return;
1895 case 'A':
1896 if (!vc->vc_par[0])
1897 vc->vc_par[0]++;
1898 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1899 return;
1900 case 'B': case 'e':
1901 if (!vc->vc_par[0])
1902 vc->vc_par[0]++;
1903 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1904 return;
1905 case 'C': case 'a':
1906 if (!vc->vc_par[0])
1907 vc->vc_par[0]++;
1908 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1909 return;
1910 case 'D':
1911 if (!vc->vc_par[0])
1912 vc->vc_par[0]++;
1913 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1914 return;
1915 case 'E':
1916 if (!vc->vc_par[0])
1917 vc->vc_par[0]++;
1918 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1919 return;
1920 case 'F':
1921 if (!vc->vc_par[0])
1922 vc->vc_par[0]++;
1923 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1924 return;
1925 case 'd':
1926 if (vc->vc_par[0])
1927 vc->vc_par[0]--;
1928 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1929 return;
1930 case 'H': case 'f':
1931 if (vc->vc_par[0])
1932 vc->vc_par[0]--;
1933 if (vc->vc_par[1])
1934 vc->vc_par[1]--;
1935 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1936 return;
1937 case 'J':
1938 csi_J(vc, vc->vc_par[0]);
1939 return;
1940 case 'K':
1941 csi_K(vc, vc->vc_par[0]);
1942 return;
1943 case 'L':
1944 csi_L(vc, vc->vc_par[0]);
1945 return;
1946 case 'M':
1947 csi_M(vc, vc->vc_par[0]);
1948 return;
1949 case 'P':
1950 csi_P(vc, vc->vc_par[0]);
1951 return;
1952 case 'c':
1953 if (!vc->vc_par[0])
1954 respond_ID(tty);
1955 return;
1956 case 'g':
1957 if (!vc->vc_par[0])
1958 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1959 else if (vc->vc_par[0] == 3) {
1960 vc->vc_tab_stop[0] =
1961 vc->vc_tab_stop[1] =
1962 vc->vc_tab_stop[2] =
1963 vc->vc_tab_stop[3] =
a564738c
WK		 1964 vc->vc_tab_stop[4] =
1965 vc->vc_tab_stop[5] =
1966 vc->vc_tab_stop[6] =
1967 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1968 }
1969 return;
1970 case 'm':
1971 csi_m(vc);
1972 return;
1973 case 'q': /* DECLL - but only 3 leds */
1974 /* map 0,1,2,3 to 0,1,2,4 */
1975 if (vc->vc_par[0] < 4)
1976 setledstate(kbd_table + vc->vc_num,
1977 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1978 return;
1979 case 'r':
1980 if (!vc->vc_par[0])
1981 vc->vc_par[0]++;
1982 if (!vc->vc_par[1])
1983 vc->vc_par[1] = vc->vc_rows;
1984 /* Minimum allowed region is 2 lines */
1985 if (vc->vc_par[0] < vc->vc_par[1] &&
1986 vc->vc_par[1] <= vc->vc_rows) {
1987 vc->vc_top = vc->vc_par[0] - 1;
1988 vc->vc_bottom = vc->vc_par[1];
1989 gotoxay(vc, 0, 0);
1990 }
1991 return;
1992 case 's':
1993 save_cur(vc);
1994 return;
1995 case 'u':
1996 restore_cur(vc);
1997 return;
1998 case 'X':
1999 csi_X(vc, vc->vc_par[0]);
2000 return;
2001 case '@':
2002 csi_at(vc, vc->vc_par[0]);
2003 return;
2004 case ']': /* setterm functions */
2005 setterm_command(vc);
2006 return;
2007 }
2008 return;
2009 case ESpercent:
2010 vc->vc_state = ESnormal;
2011 switch (c) {
2012 case '@': /* defined in ISO 2022 */
2013 vc->vc_utf = 0;
2014 return;
2015 case 'G': /* prelim official escape code */
2016 case '8': /* retained for compatibility */
2017 vc->vc_utf = 1;
2018 return;
2019 }
2020 return;
2021 case ESfunckey:
2022 vc->vc_state = ESnormal;
2023 return;
2024 case EShash:
2025 vc->vc_state = ESnormal;
2026 if (c == '8') {
2027 /* DEC screen alignment test. kludge :-) */
2028 vc->vc_video_erase_char =
2029 (vc->vc_video_erase_char & 0xff00) | 'E';
2030 csi_J(vc, 2);
2031 vc->vc_video_erase_char =
2032 (vc->vc_video_erase_char & 0xff00) | ' ';
2033 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2034 }
2035 return;
2036 case ESsetG0:
2037 if (c == '0')
2038 vc->vc_G0_charset = GRAF_MAP;
2039 else if (c == 'B')
2040 vc->vc_G0_charset = LAT1_MAP;
2041 else if (c == 'U')
2042 vc->vc_G0_charset = IBMPC_MAP;
2043 else if (c == 'K')
2044 vc->vc_G0_charset = USER_MAP;
2045 if (vc->vc_charset == 0)
2046 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2047 vc->vc_state = ESnormal;
2048 return;
2049 case ESsetG1:
2050 if (c == '0')
2051 vc->vc_G1_charset = GRAF_MAP;
2052 else if (c == 'B')
2053 vc->vc_G1_charset = LAT1_MAP;
2054 else if (c == 'U')
2055 vc->vc_G1_charset = IBMPC_MAP;
2056 else if (c == 'K')
2057 vc->vc_G1_charset = USER_MAP;
2058 if (vc->vc_charset == 1)
2059 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2060 vc->vc_state = ESnormal;
2061 return;
2062 default:
2063 vc->vc_state = ESnormal;
2064 }
2065}
2066
2067/* This is a temporary buffer used to prepare a tty console write
2068 * so that we can easily avoid touching user space while holding the
2069 * console spinlock. It is allocated in con_init and is shared by
2070 * this code and the vc_screen read/write tty calls.
2071 *
2072 * We have to allocate this statically in the kernel data section
2073 * since console_init (and thus con_init) are called before any
2074 * kernel memory allocation is available.
2075 */
2076char con_buf[CON_BUF_SIZE];
c831c338 2077DEFINE_MUTEX(con_buf_mtx);
1da177e4 2078
2f1a2ccb 2079/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2080 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2081 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2082 */
2083struct interval {
2084 uint32_t first;
2085 uint32_t last;
2086};
2087
2088static int bisearch(uint32_t ucs, const struct interval *table, int max)
2089{
2090 int min = 0;
2091 int mid;
2092
2093 if (ucs < table[0].first || ucs > table[max].last)
2094 return 0;
2095 while (max >= min) {
2096 mid = (min + max) / 2;
2097 if (ucs > table[mid].last)
2098 min = mid + 1;
2099 else if (ucs < table[mid].first)
2100 max = mid - 1;
2101 else
2102 return 1;
2103 }
2104 return 0;
2105}
2106
2107static int is_double_width(uint32_t ucs)
2108{
2109 static const struct interval double_width[] = {
2110 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2111 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2112 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2113 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2114 };
0f11541b 2115 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2116}
2117
1da177e4
LT		 2118/* acquires console_sem */
2119static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2120{
2121#ifdef VT_BUF_VRAM_ONLY
2122#define FLUSH do { } while(0);
2123#else
2124#define FLUSH if (draw_x >= 0) { \
2125 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2126 draw_x = -1; \
2127 }
2128#endif
2129
2130 int c, tc, ok, n = 0, draw_x = -1;
2131 unsigned int currcons;
2132 unsigned long draw_from = 0, draw_to = 0;
2133 struct vc_data *vc;
2f1a2ccb 2134 unsigned char vc_attr;
0341a4d0 2135 struct vt_notifier_param param;
2f1a2ccb
EK		 2136 uint8_t rescan;
2137 uint8_t inverse;
2138 uint8_t width;
1da177e4 2139 u16 himask, charmask;
1da177e4
LT		 2140
2141 if (in_interrupt())
2142 return count;
2143
2144 might_sleep();
2145
2146 acquire_console_sem();
2147 vc = tty->driver_data;
2148 if (vc == NULL) {
2149 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2150 release_console_sem();
2151 return 0;
2152 }
2153
2154 currcons = vc->vc_num;
2155 if (!vc_cons_allocated(currcons)) {
2156 /* could this happen? */
9074d963 2157 printk_once("con_write: tty %d not allocated\n", currcons+1);
1da177e4
LT		 2158 release_console_sem();
2159 return 0;
2160 }
1da177e4 2161
1da177e4
LT		 2162 himask = vc->vc_hi_font_mask;
2163 charmask = himask ? 0x1ff : 0xff;
2164
2165 /* undraw cursor first */
2166 if (IS_FG(vc))
2167 hide_cursor(vc);
2168
0341a4d0
KD		 2169 param.vc = vc;
2170
1da177e4
LT		 2171 while (!tty->stopped && count) {
2172 int orig = *buf;
2173 c = orig;
2174 buf++;
2175 n++;
2176 count--;
2f1a2ccb
EK		 2177 rescan = 0;
2178 inverse = 0;
2179 width = 1;
1da177e4
LT		 2180
2181 /* Do no translation at all in control states */
2182 if (vc->vc_state != ESnormal) {
2183 tc = c;
d4328b40 2184 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2185 /* Combine UTF-8 into Unicode in vc_utf_char.
2186 * vc_utf_count is the number of continuation bytes still
2187 * expected to arrive.
2188 * vc_npar is the number of continuation bytes arrived so
2189 * far
2190 */
d4328b40 2191rescan_last_byte:
2f1a2ccb
EK		 2192 if ((c & 0xc0) == 0x80) {
2193 /* Continuation byte received */
2194 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2195 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2196 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2197 vc->vc_npar++;
2198 if (--vc->vc_utf_count) {
2199 /* Still need some bytes */
1da177e4 2200 continue;
2f1a2ccb
EK		 2201 }
2202 /* Got a whole character */
2203 c = vc->vc_utf_char;
2204 /* Reject overlong sequences */
2205 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2206 c > utf8_length_changes[vc->vc_npar])
2207 c = 0xfffd;
2208 } else {
2209 /* Unexpected continuation byte */
2210 vc->vc_utf_count = 0;
2211 c = 0xfffd;
2212 }
1da177e4 2213 } else {
2f1a2ccb
EK		 2214 /* Single ASCII byte or first byte of a sequence received */
2215 if (vc->vc_utf_count) {
2216 /* Continuation byte expected */
2217 rescan = 1;
2218 vc->vc_utf_count = 0;
2219 c = 0xfffd;
2220 } else if (c > 0x7f) {
2221 /* First byte of a multibyte sequence received */
2222 vc->vc_npar = 0;
2223 if ((c & 0xe0) == 0xc0) {
2224 vc->vc_utf_count = 1;
2225 vc->vc_utf_char = (c & 0x1f);
2226 } else if ((c & 0xf0) == 0xe0) {
2227 vc->vc_utf_count = 2;
2228 vc->vc_utf_char = (c & 0x0f);
2229 } else if ((c & 0xf8) == 0xf0) {
2230 vc->vc_utf_count = 3;
2231 vc->vc_utf_char = (c & 0x07);
2232 } else if ((c & 0xfc) == 0xf8) {
2233 vc->vc_utf_count = 4;
2234 vc->vc_utf_char = (c & 0x03);
2235 } else if ((c & 0xfe) == 0xfc) {
2236 vc->vc_utf_count = 5;
2237 vc->vc_utf_char = (c & 0x01);
2238 } else {
2239 /* 254 and 255 are invalid */
2240 c = 0xfffd;
2241 }
2242 if (vc->vc_utf_count) {
2243 /* Still need some bytes */
2244 continue;
2245 }
2246 }
2247 /* Nothing to do if an ASCII byte was received */
1da177e4 2248 }
2f1a2ccb
EK		 2249 /* End of UTF-8 decoding. */
2250 /* c is the received character, or U+FFFD for invalid sequences. */
2251 /* Replace invalid Unicode code points with U+FFFD too */
2252 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2253 c = 0xfffd;
2254 tc = c;
d4328b40 2255 } else { /* no utf or alternate charset mode */
a29ccf6f 2256 tc = vc_translate(vc, c);
1da177e4
LT		 2257 }
2258
0341a4d0
KD		 2259 param.c = tc;
2260 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2261 &param) == NOTIFY_STOP)
2262 continue;
2263
1da177e4
LT		 2264 /* If the original code was a control character we
2265 * only allow a glyph to be displayed if the code is
2266 * not normally used (such as for cursor movement) or
2267 * if the disp_ctrl mode has been explicitly enabled.
2268 * Certain characters (as given by the CTRL_ALWAYS
2269 * bitmap) are always displayed as control characters,
2270 * as the console would be pretty useless without
2271 * them; to display an arbitrary font position use the
2272 * direct-to-font zone in UTF-8 mode.
2273 */
2274 ok = tc && (c >= 32 ||
d4328b40
AT		 2275 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2276 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2277 && (c != 127 || vc->vc_disp_ctrl)
2278 && (c != 128+27);
2279
2280 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2281 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2282 if (is_double_width(c))
2283 width = 2;
2284 }
1da177e4
LT		 2285 /* Now try to find out how to display it */
2286 tc = conv_uni_to_pc(vc, tc);
d4328b40 2287 if (tc & ~charmask) {
2f1a2ccb
EK		 2288 if (tc == -1 || tc == -2) {
2289 continue; /* nothing to display */
2290 }
2291 /* Glyph not found */
c0b79882 2292 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2293 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2294 This would make absolutely no sense with Unicode in mind,
2295 but do this for ASCII characters since a font may lack
2296 Unicode mapping info and we don't want to end up with
2297 having question marks only. */
2f1a2ccb
EK		 2298 tc = c;
2299 } else {
2300 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2301 tc = conv_uni_to_pc(vc, 0xfffd);
2302 if (tc < 0) {
2303 inverse = 1;
2304 tc = conv_uni_to_pc(vc, '?');
2305 if (tc < 0) tc = '?';
2306 }
2307 }
d4328b40 2308 }
1da177e4 2309
2f1a2ccb
EK		 2310 if (!inverse) {
2311 vc_attr = vc->vc_attr;
1da177e4 2312 } else {
2f1a2ccb
EK		 2313 /* invert vc_attr */
2314 if (!vc->vc_can_do_color) {
2315 vc_attr = (vc->vc_attr) ^ 0x08;
2316 } else if (vc->vc_hi_font_mask == 0x100) {
2317 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2318 } else {
2319 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2320 }
1ed8a2b3 2321 FLUSH
1da177e4 2322 }
2f1a2ccb
EK		 2323
2324 while (1) {
2325 if (vc->vc_need_wrap || vc->vc_decim)
2326 FLUSH
2327 if (vc->vc_need_wrap) {
2328 cr(vc);
2329 lf(vc);
2330 }
2331 if (vc->vc_decim)
2332 insert_char(vc, 1);
2333 scr_writew(himask ?
2334 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2335 (vc_attr << 8) + tc,
2336 (u16 *) vc->vc_pos);
2337 if (DO_UPDATE(vc) && draw_x < 0) {
2338 draw_x = vc->vc_x;
2339 draw_from = vc->vc_pos;
2340 }
2341 if (vc->vc_x == vc->vc_cols - 1) {
2342 vc->vc_need_wrap = vc->vc_decawm;
2343 draw_to = vc->vc_pos + 2;
2344 } else {
2345 vc->vc_x++;
2346 draw_to = (vc->vc_pos += 2);
d4328b40 2347 }
2f1a2ccb
EK		 2348
2349 if (!--width) break;
2350
2351 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2352 if (tc < 0) tc = ' ';
2353 }
b293d758 2354 notify_write(vc, c);
2f1a2ccb 2355
1ed8a2b3
EK		 2356 if (inverse) {
2357 FLUSH
2358 }
2359
2f1a2ccb
EK		 2360 if (rescan) {
2361 rescan = 0;
2362 inverse = 0;
2363 width = 1;
d4328b40
AT		 2364 c = orig;
2365 goto rescan_last_byte;
2366 }
1da177e4
LT		 2367 continue;
2368 }
2369 FLUSH
2370 do_con_trol(tty, vc, orig);
2371 }
2372 FLUSH
2373 console_conditional_schedule();
2374 release_console_sem();
b293d758 2375 notify_update(vc);
1da177e4
LT		 2376 return n;
2377#undef FLUSH
2378}
2379
2380/*
2381 * This is the console switching callback.
2382 *
2383 * Doing console switching in a process context allows
2384 * us to do the switches asynchronously (needed when we want
2385 * to switch due to a keyboard interrupt). Synchronization
2386 * with other console code and prevention of re-entrancy is
2387 * ensured with console_sem.
2388 */
65f27f38 2389static void console_callback(struct work_struct *ignored)
1da177e4
LT		 2390{
2391 acquire_console_sem();
2392
2393 if (want_console >= 0) {
2394 if (want_console != fg_console &&
2395 vc_cons_allocated(want_console)) {
2396 hide_cursor(vc_cons[fg_console].d);
2397 change_console(vc_cons[want_console].d);
2398 /* we only changed when the console had already
2399 been allocated - a new console is not created
2400 in an interrupt routine */
2401 }
2402 want_console = -1;
2403 }
2404 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2405 do_poke_blanked_console = 0;
2406 poke_blanked_console();
2407 }
2408 if (scrollback_delta) {
2409 struct vc_data *vc = vc_cons[fg_console].d;
2410 clear_selection();
2411 if (vc->vc_mode == KD_TEXT)
2412 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2413 scrollback_delta = 0;
2414 }
2415 if (blank_timer_expired) {
2416 do_blank_screen(0);
2417 blank_timer_expired = 0;
2418 }
b293d758 2419 notify_update(vc_cons[fg_console].d);
1da177e4
LT		 2420
2421 release_console_sem();
2422}
2423
b257bc05 2424int set_console(int nr)
1da177e4 2425{
b257bc05
AJ		 2426 struct vc_data *vc = vc_cons[fg_console].d;
2427
2428 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2429 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2430
2431 /*
2432 * Console switch will fail in console_callback() or
2433 * change_console() so there is no point scheduling
2434 * the callback
2435 *
2436 * Existing set_console() users don't check the return
2437 * value so this shouldn't break anything
2438 */
2439 return -EINVAL;
2440 }
2441
1da177e4
LT		 2442 want_console = nr;
2443 schedule_console_callback();
b257bc05
AJ		 2444
2445 return 0;
1da177e4
LT		 2446}
2447
2448struct tty_driver *console_driver;
2449
2450#ifdef CONFIG_VT_CONSOLE
2451
5ada918b
BW		 2452/**
2453 * vt_kmsg_redirect() - Sets/gets the kernel message console
2454 * @new: The new virtual terminal number or -1 if the console should stay
2455 * unchanged
2456 *
2457 * By default, the kernel messages are always printed on the current virtual
2458 * console. However, the user may modify that default with the
2459 * TIOCL_SETKMSGREDIRECT ioctl call.
2460 *
2461 * This function sets the kernel message console to be @new. It returns the old
2462 * virtual console number. The virtual terminal number 0 (both as parameter and
2463 * return value) means no redirection (i.e. always printed on the currently
2464 * active console).
2465 *
2466 * The parameter -1 means that only the current console is returned, but the
2467 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2468 * case to make the code more understandable.
2469 *
2470 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2471 * the parameter and always returns 0.
2472 */
2473int vt_kmsg_redirect(int new)
2474{
2475 static int kmsg_con;
2476
2477 if (new != -1)
2478 return xchg(&kmsg_con, new);
2479 else
2480 return kmsg_con;
2481}
2482
1da177e4
LT		 2483/*
2484 * Console on virtual terminal
2485 *
2486 * The console must be locked when we get here.
2487 */
2488
2489static void vt_console_print(struct console *co, const char *b, unsigned count)
2490{
2491 struct vc_data *vc = vc_cons[fg_console].d;
2492 unsigned char c;
b0940003 2493 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2494 const ushort *start;
2495 ushort cnt = 0;
2496 ushort myx;
5ada918b 2497 int kmsg_console;
1da177e4
LT		 2498
2499 /* console busy or not yet initialized */
b0940003
NP		 2500 if (!printable)
2501 return;
2502 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2503 return;
2504
5ada918b
BW		 2505 kmsg_console = vt_get_kmsg_redirect();
2506 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2507 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2508
2509 /* read `x' only after setting currcons properly (otherwise
2510 the `x' macro will read the x of the foreground console). */
2511 myx = vc->vc_x;
2512
2513 if (!vc_cons_allocated(fg_console)) {
2514 /* impossible */
2515 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2516 goto quit;
2517 }
2518
8fd4bd22 2519 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2520 goto quit;
2521
2522 /* undraw cursor first */
2523 if (IS_FG(vc))
2524 hide_cursor(vc);
2525
2526 start = (ushort *)vc->vc_pos;
2527
2528 /* Contrived structure to try to emulate original need_wrap behaviour
2529 * Problems caused when we have need_wrap set on '\n' character */
2530 while (count--) {
2531 c = *b++;
2532 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2533 if (cnt > 0) {
2534 if (CON_IS_VISIBLE(vc))
2535 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2536 vc->vc_x += cnt;
2537 if (vc->vc_need_wrap)
2538 vc->vc_x--;
2539 cnt = 0;
2540 }
2541 if (c == 8) { /* backspace */
2542 bs(vc);
2543 start = (ushort *)vc->vc_pos;
2544 myx = vc->vc_x;
2545 continue;
2546 }
2547 if (c != 13)
2548 lf(vc);
2549 cr(vc);
2550 start = (ushort *)vc->vc_pos;
2551 myx = vc->vc_x;
2552 if (c == 10 || c == 13)
2553 continue;
2554 }
2555 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2556 notify_write(vc, c);
1da177e4
LT		 2557 cnt++;
2558 if (myx == vc->vc_cols - 1) {
2559 vc->vc_need_wrap = 1;
2560 continue;
2561 }
2562 vc->vc_pos += 2;
2563 myx++;
2564 }
2565 if (cnt > 0) {
2566 if (CON_IS_VISIBLE(vc))
2567 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2568 vc->vc_x += cnt;
2569 if (vc->vc_x == vc->vc_cols) {
2570 vc->vc_x--;
2571 vc->vc_need_wrap = 1;
2572 }
2573 }
2574 set_cursor(vc);
b293d758 2575 notify_update(vc);
1da177e4
LT		 2576
2577quit:
b0940003 2578 spin_unlock(&printing_lock);
1da177e4
LT		 2579}
2580
2581static struct tty_driver *vt_console_device(struct console *c, int *index)
2582{
2583 *index = c->index ? c->index-1 : fg_console;
2584 return console_driver;
2585}
2586
2587static struct console vt_console_driver = {
2588 .name = "tty",
2589 .write = vt_console_print,
2590 .device = vt_console_device,
2591 .unblank = unblank_screen,
2592 .flags = CON_PRINTBUFFER,
2593 .index = -1,
2594};
2595#endif
2596
2597/*
2598 * Handling of Linux-specific VC ioctls
2599 */
2600
2601/*
2602 * Generally a bit racy with respect to console_sem().
2603 *
2604 * There are some functions which don't need it.
2605 *
2606 * There are some functions which can sleep for arbitrary periods
2607 * (paste_selection) but we don't need the lock there anyway.
2608 *
2609 * set_selection has locking, and definitely needs it
2610 */
2611
2612int tioclinux(struct tty_struct *tty, unsigned long arg)
2613{
2614 char type, data;
2615 char __user *p = (char __user *)arg;
2616 int lines;
2617 int ret;
2618
1da177e4
LT		 2619 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2620 return -EPERM;
2621 if (get_user(type, p))
2622 return -EFAULT;
2623 ret = 0;
04f378b1 2624
1da177e4
LT		 2625 switch (type)
2626 {
2627 case TIOCL_SETSEL:
2628 acquire_console_sem();
2629 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2630 release_console_sem();
2631 break;
2632 case TIOCL_PASTESEL:
2633 ret = paste_selection(tty);
2634 break;
2635 case TIOCL_UNBLANKSCREEN:
2d237c63 2636 acquire_console_sem();
1da177e4 2637 unblank_screen();
2d237c63 2638 release_console_sem();
1da177e4
LT		 2639 break;
2640 case TIOCL_SELLOADLUT:
2641 ret = sel_loadlut(p);
2642 break;
2643 case TIOCL_GETSHIFTSTATE:
04f378b1 2644
1da177e4
LT		 2645 /*
2646 * Make it possible to react to Shift+Mousebutton.
2647 * Note that 'shift_state' is an undocumented
2648 * kernel-internal variable; programs not closely
2649 * related to the kernel should not use this.
2650 */
2651 data = shift_state;
2652 ret = __put_user(data, p);
2653 break;
2654 case TIOCL_GETMOUSEREPORTING:
2655 data = mouse_reporting();
2656 ret = __put_user(data, p);
2657 break;
2658 case TIOCL_SETVESABLANK:
403aac96 2659 ret = set_vesa_blanking(p);
1da177e4 2660 break;
0ca07731 2661 case TIOCL_GETKMSGREDIRECT:
5ada918b 2662 data = vt_get_kmsg_redirect();
0ca07731
RW		 2663 ret = __put_user(data, p);
2664 break;
1da177e4
LT		 2665 case TIOCL_SETKMSGREDIRECT:
2666 if (!capable(CAP_SYS_ADMIN)) {
2667 ret = -EPERM;
2668 } else {
2669 if (get_user(data, p+1))
2670 ret = -EFAULT;
2671 else
5ada918b 2672 vt_kmsg_redirect(data);
1da177e4
LT		 2673 }
2674 break;
2675 case TIOCL_GETFGCONSOLE:
2676 ret = fg_console;
2677 break;
2678 case TIOCL_SCROLLCONSOLE:
2679 if (get_user(lines, (s32 __user *)(p+4))) {
2680 ret = -EFAULT;
2681 } else {
2682 scrollfront(vc_cons[fg_console].d, lines);
2683 ret = 0;
2684 }
2685 break;
2686 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2687 acquire_console_sem();
1da177e4
LT		 2688 ignore_poke = 1;
2689 do_blank_screen(0);
2d237c63 2690 release_console_sem();
1da177e4
LT		 2691 break;
2692 case TIOCL_BLANKEDSCREEN:
2693 ret = console_blanked;
2694 break;
2695 default:
2696 ret = -EINVAL;
2697 break;
2698 }
2699 return ret;
2700}
2701
2702/*
2703 * /dev/ttyN handling
2704 */
2705
2706static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2707{
2708 int retval;
2709
2710 retval = do_con_write(tty, buf, count);
2711 con_flush_chars(tty);
2712
2713 return retval;
2714}
2715
5d19f546 2716static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2717{
2718 if (in_interrupt())
5d19f546
AC		 2719 return 0; /* n_r3964 calls put_char() from interrupt context */
2720 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2721}
2722
2723static int con_write_room(struct tty_struct *tty)
2724{
2725 if (tty->stopped)
2726 return 0;
a88a69c9 2727 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2728}
2729
2730static int con_chars_in_buffer(struct tty_struct *tty)
2731{
2732 return 0; /* we're not buffering */
2733}
2734
2735/*
2736 * con_throttle and con_unthrottle are only used for
2737 * paste_selection(), which has to stuff in a large number of
2738 * characters...
2739 */
2740static void con_throttle(struct tty_struct *tty)
2741{
2742}
2743
2744static void con_unthrottle(struct tty_struct *tty)
2745{
2746 struct vc_data *vc = tty->driver_data;
2747
2748 wake_up_interruptible(&vc->paste_wait);
2749}
2750
2751/*
2752 * Turn the Scroll-Lock LED on when the tty is stopped
2753 */
2754static void con_stop(struct tty_struct *tty)
2755{
2756 int console_num;
2757 if (!tty)
2758 return;
2759 console_num = tty->index;
2760 if (!vc_cons_allocated(console_num))
2761 return;
2762 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2763 set_leds();
2764}
2765
2766/*
2767 * Turn the Scroll-Lock LED off when the console is started
2768 */
2769static void con_start(struct tty_struct *tty)
2770{
2771 int console_num;
2772 if (!tty)
2773 return;
2774 console_num = tty->index;
2775 if (!vc_cons_allocated(console_num))
2776 return;
2777 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2778 set_leds();
2779}
2780
2781static void con_flush_chars(struct tty_struct *tty)
2782{
2783 struct vc_data *vc;
2784
2785 if (in_interrupt()) /* from flush_to_ldisc */
2786 return;
2787
2788 /* if we race with con_close(), vt may be null */
2789 acquire_console_sem();
2790 vc = tty->driver_data;
2791 if (vc)
2792 set_cursor(vc);
2793 release_console_sem();
2794}
2795
2796/*
2797 * Allocate the console screen memory.
2798 */
2799static int con_open(struct tty_struct *tty, struct file *filp)
2800{
2801 unsigned int currcons = tty->index;
2802 int ret = 0;
2803
2804 acquire_console_sem();
f786648b 2805 if (tty->driver_data == NULL) {
1da177e4
LT		 2806 ret = vc_allocate(currcons);
2807 if (ret == 0) {
2808 struct vc_data *vc = vc_cons[currcons].d;
feebed65
AC		 2809
2810 /* Still being freed */
8ce73264 2811 if (vc->port.tty) {
feebed65
AC		 2812 release_console_sem();
2813 return -ERESTARTSYS;
2814 }
1da177e4 2815 tty->driver_data = vc;
8ce73264 2816 vc->port.tty = tty;
1da177e4
LT		 2817
2818 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2819 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2820 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2821 }
c1236d31
ST		 2822 if (vc->vc_utf)
2823 tty->termios->c_iflag |= IUTF8;
2824 else
2825 tty->termios->c_iflag &= ~IUTF8;
e0426e6a 2826 release_console_sem();
1da177e4
LT		 2827 return ret;
2828 }
2829 }
2830 release_console_sem();
2831 return ret;
2832}
2833
1da177e4
LT		 2834static void con_close(struct tty_struct *tty, struct file *filp)
2835{
feebed65
AC		 2836 /* Nothing to do - we defer to shutdown */
2837}
1da177e4 2838
feebed65
AC		 2839static void con_shutdown(struct tty_struct *tty)
2840{
2841 struct vc_data *vc = tty->driver_data;
2842 BUG_ON(vc == NULL);
2843 acquire_console_sem();
8ce73264 2844 vc->port.tty = NULL;
1da177e4 2845 release_console_sem();
feebed65 2846 tty_shutdown(tty);
1da177e4
LT		 2847}
2848
fa6ce9ab
JE		 2849static int default_italic_color = 2; // green (ASCII)
2850static int default_underline_color = 3; // cyan (ASCII)
2851module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2852module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2853
1da177e4
LT		 2854static void vc_init(struct vc_data *vc, unsigned int rows,
2855 unsigned int cols, int do_clear)
2856{
2857 int j, k ;
2858
2859 vc->vc_cols = cols;
2860 vc->vc_rows = rows;
2861 vc->vc_size_row = cols << 1;
2862 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2863
2864 set_origin(vc);
2865 vc->vc_pos = vc->vc_origin;
2866 reset_vc(vc);
2867 for (j=k=0; j<16; j++) {
2868 vc->vc_palette[k++] = default_red[j] ;
2869 vc->vc_palette[k++] = default_grn[j] ;
2870 vc->vc_palette[k++] = default_blu[j] ;
2871 }
2872 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2873 vc->vc_ulcolor = default_underline_color;
2874 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2875 vc->vc_halfcolor = 0x08; /* grey */
2876 init_waitqueue_head(&vc->paste_wait);
2877 reset_terminal(vc, do_clear);
2878}
2879
2880/*
2881 * This routine initializes console interrupts, and does nothing
2882 * else. If you want the screen to clear, call tty_write with
2883 * the appropriate escape-sequence.
2884 */
2885
2886static int __init con_init(void)
2887{
2888 const char *display_desc = NULL;
2889 struct vc_data *vc;
3e795de7 2890 unsigned int currcons = 0, i;
1da177e4
LT		 2891
2892 acquire_console_sem();
2893
2894 if (conswitchp)
2895 display_desc = conswitchp->con_startup();
2896 if (!display_desc) {
2897 fg_console = 0;
2898 release_console_sem();
2899 return 0;
2900 }
2901
3e795de7
AD		 2902 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2903 struct con_driver *con_driver = &registered_con_driver[i];
2904
2905 if (con_driver->con == NULL) {
2906 con_driver->con = conswitchp;
2907 con_driver->desc = display_desc;
2908 con_driver->flag = CON_DRIVER_FLAG_INIT;
2909 con_driver->first = 0;
2910 con_driver->last = MAX_NR_CONSOLES - 1;
2911 break;
2912 }
2913 }
2914
2915 for (i = 0; i < MAX_NR_CONSOLES; i++)
2916 con_driver_map[i] = conswitchp;
2917
1da177e4
LT		 2918 if (blankinterval) {
2919 blank_state = blank_normal_wait;
f324edc8 2920 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2921 }
2922
1da177e4 2923 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2924 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2925 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2926 tty_port_init(&vc->port);
1da177e4 2927 visual_init(vc, currcons, 1);
a5f4f52e 2928 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2929 vc_init(vc, vc->vc_rows, vc->vc_cols,
2930 currcons || !vc->vc_sw->con_save_screen);
2931 }
2932 currcons = fg_console = 0;
2933 master_display_fg = vc = vc_cons[currcons].d;
2934 set_origin(vc);
2935 save_screen(vc);
2936 gotoxy(vc, vc->vc_x, vc->vc_y);
2937 csi_J(vc, 0);
2938 update_screen(vc);
2939 printk("Console: %s %s %dx%d",
2940 vc->vc_can_do_color ? "colour" : "mono",
2941 display_desc, vc->vc_cols, vc->vc_rows);
2942 printable = 1;
2943 printk("\n");
2944
2945 release_console_sem();
2946
2947#ifdef CONFIG_VT_CONSOLE
2948 register_console(&vt_console_driver);
2949#endif
2950 return 0;
2951}
2952console_initcall(con_init);
2953
b68e31d0 2954static const struct tty_operations con_ops = {
1da177e4
LT		 2955 .open = con_open,
2956 .close = con_close,
2957 .write = con_write,
2958 .write_room = con_write_room,
2959 .put_char = con_put_char,
2960 .flush_chars = con_flush_chars,
2961 .chars_in_buffer = con_chars_in_buffer,
2962 .ioctl = vt_ioctl,
e9216651
AB		 2963#ifdef CONFIG_COMPAT
2964 .compat_ioctl = vt_compat_ioctl,
2965#endif
1da177e4
LT		 2966 .stop = con_stop,
2967 .start = con_start,
2968 .throttle = con_throttle,
2969 .unthrottle = con_unthrottle,
8c9a9dd0 2970 .resize = vt_resize,
feebed65 2971 .shutdown = con_shutdown
1da177e4
LT		 2972};
2973
d81ed103
AC		 2974static struct cdev vc0_cdev;
2975
2976int __init vty_init(const struct file_operations *console_fops)
1da177e4 2977{
d81ed103
AC		 2978 cdev_init(&vc0_cdev, console_fops);
2979 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2980 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2981 panic("Couldn't register /dev/tty0 driver\n");
2982 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2983
1da177e4
LT		 2984 vcs_init();
2985
2986 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2987 if (!console_driver)
2988 panic("Couldn't allocate console driver\n");
2989 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2990 console_driver->name = "tty";
2991 console_driver->name_base = 1;
2992 console_driver->major = TTY_MAJOR;
2993 console_driver->minor_start = 1;
2994 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2995 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 2996 if (default_utf8)
2997 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 2998 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2999 tty_set_operations(console_driver, &con_ops);
3000 if (tty_register_driver(console_driver))
3001 panic("Couldn't register console driver\n");
1da177e4
LT		 3002 kbd_init();
3003 console_map_init();
1da177e4
LT		 3004#ifdef CONFIG_MDA_CONSOLE
3005 mda_console_init();
3006#endif
3007 return 0;
3008}
3009
3010#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3011
3012static struct class *vtconsole_class;
3013
b7269dd2
JB		 3014static int bind_con_driver(const struct consw *csw, int first, int last,
3015 int deflt)
1da177e4 3016{
3e795de7
AD		 3017 struct module *owner = csw->owner;
3018 const char *desc = NULL;
3019 struct con_driver *con_driver;
3020 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3021
1da177e4
LT		 3022 if (!try_module_get(owner))
3023 return -ENODEV;
3024
1c8ce271 3025 acquire_console_sem();
1c8ce271 3026
3e795de7
AD		 3027 /* check if driver is registered */
3028 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3029 con_driver = &registered_con_driver[i];
3030
3031 if (con_driver->con == csw) {
3032 desc = con_driver->desc;
3033 retval = 0;
3034 break;
3035 }
3036 }
3037
3038 if (retval)
3039 goto err;
3040
3041 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3042 csw->con_startup();
3043 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3044 }
1c8ce271 3045
1da177e4
LT		 3046 if (deflt) {
3047 if (conswitchp)
3048 module_put(conswitchp->owner);
1c8ce271 3049
1da177e4
LT		 3050 __module_get(owner);
3051 conswitchp = csw;
3052 }
3053
3e795de7
AD		 3054 first = max(first, con_driver->first);
3055 last = min(last, con_driver->last);
3056
1da177e4
LT		 3057 for (i = first; i <= last; i++) {
3058 int old_was_color;
3059 struct vc_data *vc = vc_cons[i].d;
3060
3061 if (con_driver_map[i])
3062 module_put(con_driver_map[i]->owner);
3063 __module_get(owner);
3064 con_driver_map[i] = csw;
3065
3066 if (!vc || !vc->vc_sw)
3067 continue;
3068
3069 j = i;
1c8ce271 3070
4ee1acce
DH		 3071 if (CON_IS_VISIBLE(vc)) {
3072 k = i;
1da177e4 3073 save_screen(vc);
4ee1acce
DH		 3074 }
3075
1da177e4
LT		 3076 old_was_color = vc->vc_can_do_color;
3077 vc->vc_sw->con_deinit(vc);
02f0777a 3078 if (!vc->vc_origin)
3079 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3080 visual_init(vc, i, 0);
1c8ce271 3081 set_origin(vc);
1da177e4
LT		 3082 update_attr(vc);
3083
3084 /* If the console changed between mono <-> color, then
3085 * the attributes in the screenbuf will be wrong. The
3086 * following resets all attributes to something sane.
3087 */
3088 if (old_was_color != vc->vc_can_do_color)
3089 clear_buffer_attributes(vc);
1da177e4 3090 }
4ee1acce 3091
1da177e4
LT		 3092 printk("Console: switching ");
3093 if (!deflt)
3094 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3095 if (j >= 0) {
3096 struct vc_data *vc = vc_cons[j].d;
3097
1da177e4 3098 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3099 vc->vc_can_do_color ? "colour" : "mono",
3100 desc, vc->vc_cols, vc->vc_rows);
3101
3102 if (k >= 0) {
3103 vc = vc_cons[k].d;
3104 update_screen(vc);
3105 }
3106 } else
1da177e4
LT		 3107 printk("to %s\n", desc);
3108
3e795de7
AD		 3109 retval = 0;
3110err:
1da177e4 3111 release_console_sem();
1da177e4 3112 module_put(owner);
3e795de7
AD		 3113 return retval;
3114};
1da177e4 3115
13ae6645
AD		 3116#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3117static int con_is_graphics(const struct consw *csw, int first, int last)
3118{
3119 int i, retval = 0;
3120
3121 for (i = first; i <= last; i++) {
3122 struct vc_data *vc = vc_cons[i].d;
3123
3124 if (vc && vc->vc_mode == KD_GRAPHICS) {
3125 retval = 1;
3126 break;
3127 }
3128 }
3129
3130 return retval;
3131}
3132
b7269dd2
JB		 3133/**
3134 * unbind_con_driver - unbind a console driver
3135 * @csw: pointer to console driver to unregister
3136 * @first: first in range of consoles that @csw should be unbound from
3137 * @last: last in range of consoles that @csw should be unbound from
3138 * @deflt: should next bound console driver be default after @csw is unbound?
3139 *
3140 * To unbind a driver from all possible consoles, pass 0 as @first and
3141 * %MAX_NR_CONSOLES as @last.
3142 *
3143 * @deflt controls whether the console that ends up replacing @csw should be
3144 * the default console.
3145 *
3146 * RETURNS:
3147 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3148 * or 0 on success.
3149 */
623e71b0 3150int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3151{
3e795de7
AD		 3152 struct module *owner = csw->owner;
3153 const struct consw *defcsw = NULL;
3154 struct con_driver *con_driver = NULL, *con_back = NULL;
3155 int i, retval = -ENODEV;
1da177e4 3156
3e795de7
AD		 3157 if (!try_module_get(owner))
3158 return -ENODEV;
3159
3160 acquire_console_sem();
3161
3162 /* check if driver is registered and if it is unbindable */
3163 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3164 con_driver = &registered_con_driver[i];
3165
3166 if (con_driver->con == csw &&
6db4063c 3167 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3168 retval = 0;
3169 break;
3170 }
3171 }
3172
3173 if (retval) {
3174 release_console_sem();
3175 goto err;
3176 }
3177
6db4063c
AD		 3178 retval = -ENODEV;
3179
3e795de7
AD		 3180 /* check if backup driver exists */
3181 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3182 con_back = &registered_con_driver[i];
3183
3184 if (con_back->con &&
6db4063c 3185 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3186 defcsw = con_back->con;
3187 retval = 0;
3188 break;
3189 }
3190 }
3191
3192 if (retval) {
3193 release_console_sem();
3194 goto err;
3195 }
3196
3197 if (!con_is_bound(csw)) {
3198 release_console_sem();
3199 goto err;
3200 }
3201
3202 first = max(first, con_driver->first);
3203 last = min(last, con_driver->last);
3204
3205 for (i = first; i <= last; i++) {
1da177e4
LT		 3206 if (con_driver_map[i] == csw) {
3207 module_put(csw->owner);
3208 con_driver_map[i] = NULL;
3209 }
3e795de7
AD		 3210 }
3211
3212 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3213 const struct consw *defconsw = conswitchp;
3214
3e795de7
AD		 3215 defcsw->con_startup();
3216 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3217 /*
3218 * vgacon may change the default driver to point
3219 * to dummycon, we restore it here...
3220 */
3221 conswitchp = defconsw;
3e795de7
AD		 3222 }
3223
3224 if (!con_is_bound(csw))
3225 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3226
3227 release_console_sem();
6db4063c
AD		 3228 /* ignore return value, binding should not fail */
3229 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3230err:
3231 module_put(owner);
3232 return retval;
3233
3234}
623e71b0 3235EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3236
6db4063c
AD		 3237static int vt_bind(struct con_driver *con)
3238{
3239 const struct consw *defcsw = NULL, *csw = NULL;
3240 int i, more = 1, first = -1, last = -1, deflt = 0;
3241
3242 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3243 con_is_graphics(con->con, con->first, con->last))
3244 goto err;
3245
3246 csw = con->con;
3247
3248 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3249 struct con_driver *con = &registered_con_driver[i];
3250
3251 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3252 defcsw = con->con;
3253 break;
3254 }
3255 }
3256
3257 if (!defcsw)
3258 goto err;
3259
3260 while (more) {
3261 more = 0;
3262
3263 for (i = con->first; i <= con->last; i++) {
3264 if (con_driver_map[i] == defcsw) {
3265 if (first == -1)
3266 first = i;
3267 last = i;
3268 more = 1;
3269 } else if (first != -1)
3270 break;
3271 }
3272
3273 if (first == 0 && last == MAX_NR_CONSOLES -1)
3274 deflt = 1;
3275
3276 if (first != -1)
3277 bind_con_driver(csw, first, last, deflt);
3278
3279 first = -1;
3280 last = -1;
3281 deflt = 0;
3282 }
3283
3284err:
3285 return 0;
3286}
3287
3288static int vt_unbind(struct con_driver *con)
3289{
3290 const struct consw *csw = NULL;
3291 int i, more = 1, first = -1, last = -1, deflt = 0;
3292
3293 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3294 con_is_graphics(con->con, con->first, con->last))
3295 goto err;
3296
3297 csw = con->con;
3298
3299 while (more) {
3300 more = 0;
3301
3302 for (i = con->first; i <= con->last; i++) {
3303 if (con_driver_map[i] == csw) {
3304 if (first == -1)
3305 first = i;
3306 last = i;
3307 more = 1;
3308 } else if (first != -1)
3309 break;
3310 }
3311
3312 if (first == 0 && last == MAX_NR_CONSOLES -1)
3313 deflt = 1;
3314
3315 if (first != -1)
3316 unbind_con_driver(csw, first, last, deflt);
3317
3318 first = -1;
3319 last = -1;
3320 deflt = 0;
3321 }
3322
3323err:
3324 return 0;
3325}
13ae6645
AD		 3326#else
3327static inline int vt_bind(struct con_driver *con)
3328{
3329 return 0;
3330}
3331static inline int vt_unbind(struct con_driver *con)
3332{
3333 return 0;
3334}
3335#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3336
805952a8 3337static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3338 const char *buf, size_t count)
3339{
805952a8 3340 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3341 int bind = simple_strtoul(buf, NULL, 0);
3342
3343 if (bind)
3344 vt_bind(con);
3345 else
3346 vt_unbind(con);
3347
3348 return count;
3349}
3350
805952a8
GKH		 3351static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3352 char *buf)
6db4063c 3353{
805952a8 3354 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3355 int bind = con_is_bound(con->con);
3356
3357 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3358}
3359
805952a8
GKH		 3360static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3361 char *buf)
6db4063c 3362{
805952a8 3363 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3364
3365 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3366 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3367 con->desc);
3368
3369}
3370
805952a8 3371static struct device_attribute device_attrs[] = {
6db4063c
AD		 3372 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3373 __ATTR(name, S_IRUGO, show_name, NULL),
3374};
3375
805952a8 3376static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3377{
3378 int i;
928e964f 3379 int error = 0;
6db4063c 3380
928e964f 3381 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3382 dev_set_drvdata(con->dev, con);
3383 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3384 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3385 if (error)
3386 break;
3387 }
6db4063c 3388
928e964f
AD		 3389 if (error) {
3390 while (--i >= 0)
805952a8 3391 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3392 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3393 }
3394
3395 return error;
6db4063c
AD		 3396}
3397
805952a8 3398static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3399{
3400 int i;
3401
928e964f 3402 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3403 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3404 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3405 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3406 }
6db4063c
AD		 3407}
3408
3e795de7
AD		 3409/**
3410 * con_is_bound - checks if driver is bound to the console
3411 * @csw: console driver
3412 *
3413 * RETURNS: zero if unbound, nonzero if bound
3414 *
3415 * Drivers can call this and if zero, they should release
3416 * all resources allocated on con_startup()
3417 */
3418int con_is_bound(const struct consw *csw)
3419{
3420 int i, bound = 0;
3421
3422 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3423 if (con_driver_map[i] == csw) {
3424 bound = 1;
3425 break;
3426 }
3427 }
3428
3429 return bound;
3430}
3431EXPORT_SYMBOL(con_is_bound);
3432
b45cfba4
JB		 3433/**
3434 * con_debug_enter - prepare the console for the kernel debugger
3435 * @sw: console driver
3436 *
3437 * Called when the console is taken over by the kernel debugger, this
3438 * function needs to save the current console state, then put the console
3439 * into a state suitable for the kernel debugger.
3440 *
3441 * RETURNS:
3442 * Zero on success, nonzero if a failure occurred when trying to prepare
3443 * the console for the debugger.
3444 */
3445int con_debug_enter(struct vc_data *vc)
3446{
3447 int ret = 0;
3448
3449 saved_fg_console = fg_console;
3450 saved_last_console = last_console;
3451 saved_want_console = want_console;
3452 saved_vc_mode = vc->vc_mode;
beed5336 3453 saved_console_blanked = console_blanked;
b45cfba4
JB		 3454 vc->vc_mode = KD_TEXT;
3455 console_blanked = 0;
3456 if (vc->vc_sw->con_debug_enter)
3457 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3458#ifdef CONFIG_KGDB_KDB
3459 /* Set the initial LINES variable if it is not already set */
3460 if (vc->vc_rows < 999) {
3461 int linecount;
3462 char lns[4];
3463 const char *setargs[3] = {
3464 "set",
3465 "LINES",
3466 lns,
3467 };
3468 if (kdbgetintenv(setargs[0], &linecount)) {
3469 snprintf(lns, 4, "%i", vc->vc_rows);
3470 kdb_set(2, setargs);
3471 }
3472 }
3473#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3474 return ret;
3475}
3476EXPORT_SYMBOL_GPL(con_debug_enter);
3477
3478/**
3479 * con_debug_leave - restore console state
3480 * @sw: console driver
3481 *
3482 * Restore the console state to what it was before the kernel debugger
3483 * was invoked.
3484 *
3485 * RETURNS:
3486 * Zero on success, nonzero if a failure occurred when trying to restore
3487 * the console.
3488 */
3489int con_debug_leave(void)
3490{
3491 struct vc_data *vc;
3492 int ret = 0;
3493
3494 fg_console = saved_fg_console;
3495 last_console = saved_last_console;
3496 want_console = saved_want_console;
beed5336 3497 console_blanked = saved_console_blanked;
b45cfba4
JB		 3498 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3499
3500 vc = vc_cons[fg_console].d;
3501 if (vc->vc_sw->con_debug_leave)
3502 ret = vc->vc_sw->con_debug_leave(vc);
3503 return ret;
3504}
3505EXPORT_SYMBOL_GPL(con_debug_leave);
3506
3e795de7
AD		 3507/**
3508 * register_con_driver - register console driver to console layer
3509 * @csw: console driver
3510 * @first: the first console to take over, minimum value is 0
3511 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3512 *
3513 * DESCRIPTION: This function registers a console driver which can later
3514 * bind to a range of consoles specified by @first and @last. It will
3515 * also initialize the console driver by calling con_startup().
3516 */
3517int register_con_driver(const struct consw *csw, int first, int last)
3518{
3519 struct module *owner = csw->owner;
3520 struct con_driver *con_driver;
3521 const char *desc;
3522 int i, retval = 0;
3523
3524 if (!try_module_get(owner))
3525 return -ENODEV;
3526
3527 acquire_console_sem();
3528
3529 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3530 con_driver = &registered_con_driver[i];
3531
3532 /* already registered */
3533 if (con_driver->con == csw)
3534 retval = -EINVAL;
3535 }
3536
3537 if (retval)
3538 goto err;
3539
3540 desc = csw->con_startup();
3541
3542 if (!desc)
3543 goto err;
3544
3545 retval = -EINVAL;
3546
3547 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3548 con_driver = &registered_con_driver[i];
3549
3550 if (con_driver->con == NULL) {
3551 con_driver->con = csw;
3552 con_driver->desc = desc;
6db4063c
AD		 3553 con_driver->node = i;
3554 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3555 CON_DRIVER_FLAG_INIT;
3556 con_driver->first = first;
3557 con_driver->last = last;
3558 retval = 0;
3559 break;
3560 }
3561 }
3562
6db4063c
AD		 3563 if (retval)
3564 goto err;
3565
d81ed103 3566 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3567 MKDEV(0, con_driver->node),
3568 NULL, "vtcon%i",
3569 con_driver->node);
6db4063c 3570
805952a8
GKH		 3571 if (IS_ERR(con_driver->dev)) {
3572 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3573 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3574 PTR_ERR(con_driver->dev));
3575 con_driver->dev = NULL;
6db4063c 3576 } else {
805952a8 3577 vtconsole_init_device(con_driver);
6db4063c 3578 }
928e964f 3579
3e795de7
AD		 3580err:
3581 release_console_sem();
3582 module_put(owner);
3583 return retval;
3584}
3585EXPORT_SYMBOL(register_con_driver);
3586
3587/**
3588 * unregister_con_driver - unregister console driver from console layer
3589 * @csw: console driver
3590 *
3591 * DESCRIPTION: All drivers that registers to the console layer must
3592 * call this function upon exit, or if the console driver is in a state
3593 * where it won't be able to handle console services, such as the
3594 * framebuffer console without loaded framebuffer drivers.
3595 *
3596 * The driver must unbind first prior to unregistration.
3597 */
3598int unregister_con_driver(const struct consw *csw)
3599{
3600 int i, retval = -ENODEV;
3601
3602 acquire_console_sem();
3603
3604 /* cannot unregister a bound driver */
3605 if (con_is_bound(csw))
3606 goto err;
3607
3608 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3609 struct con_driver *con_driver = &registered_con_driver[i];
3610
3611 if (con_driver->con == csw &&
6db4063c 3612 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3613 vtconsole_deinit_device(con_driver);
3614 device_destroy(vtconsole_class,
3615 MKDEV(0, con_driver->node));
3e795de7
AD		 3616 con_driver->con = NULL;
3617 con_driver->desc = NULL;
805952a8 3618 con_driver->dev = NULL;
6db4063c 3619 con_driver->node = 0;
3e795de7
AD		 3620 con_driver->flag = 0;
3621 con_driver->first = 0;
3622 con_driver->last = 0;
3623 retval = 0;
3624 break;
3625 }
3626 }
3e795de7
AD		 3627err:
3628 release_console_sem();
3629 return retval;
3630}
3631EXPORT_SYMBOL(unregister_con_driver);
3632
3633/*
3634 * If we support more console drivers, this function is used
3635 * when a driver wants to take over some existing consoles
3636 * and become default driver for newly opened ones.
3637 *
3638 * take_over_console is basically a register followed by unbind
3639 */
3640int take_over_console(const struct consw *csw, int first, int last, int deflt)
3641{
3642 int err;
3643
3644 err = register_con_driver(csw, first, last);
3645
3646 if (!err)
6db4063c 3647 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3648
3649 return err;
3650}
3651
3652/*
3653 * give_up_console is a wrapper to unregister_con_driver. It will only
3654 * work if driver is fully unbound.
3655 */
3656void give_up_console(const struct consw *csw)
3657{
3658 unregister_con_driver(csw);
3659}
3660
6db4063c 3661static int __init vtconsole_class_init(void)
3e795de7 3662{
6db4063c 3663 int i;
3e795de7 3664
6db4063c
AD		 3665 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3666 if (IS_ERR(vtconsole_class)) {
3667 printk(KERN_WARNING "Unable to create vt console class; "
3668 "errno = %ld\n", PTR_ERR(vtconsole_class));
3669 vtconsole_class = NULL;
3670 }
3e795de7 3671
6db4063c 3672 /* Add system drivers to sysfs */
3e795de7
AD		 3673 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3674 struct con_driver *con = &registered_con_driver[i];
3675
805952a8 3676 if (con->con && !con->dev) {
d81ed103 3677 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3678 MKDEV(0, con->node),
3679 NULL, "vtcon%i",
3680 con->node);
6db4063c 3681
805952a8 3682 if (IS_ERR(con->dev)) {
6db4063c 3683 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3684 "device for %s; errno = %ld\n",
3685 con->desc, PTR_ERR(con->dev));
3686 con->dev = NULL;
6db4063c 3687 } else {
805952a8 3688 vtconsole_init_device(con);
6db4063c 3689 }
3e795de7 3690 }
3e795de7
AD		 3691 }
3692
3e795de7
AD		 3693 return 0;
3694}
6db4063c 3695postcore_initcall(vtconsole_class_init);
3e795de7 3696
1da177e4
LT		 3697#endif
3698
3699/*
3700 * Screen blanking
3701 */
3702
403aac96 3703static int set_vesa_blanking(char __user *p)
1da177e4 3704{
403aac96
YY		 3705 unsigned int mode;
3706
3707 if (get_user(mode, p + 1))
3708 return -EFAULT;
3709
3710 vesa_blank_mode = (mode < 4) ? mode : 0;
3711 return 0;
1da177e4
LT		 3712}
3713
1da177e4
LT		 3714void do_blank_screen(int entering_gfx)
3715{
3716 struct vc_data *vc = vc_cons[fg_console].d;
3717 int i;
3718
3719 WARN_CONSOLE_UNLOCKED();
3720
3721 if (console_blanked) {
3722 if (blank_state == blank_vesa_wait) {
3723 blank_state = blank_off;
d060a321 3724 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3725 }
3726 return;
3727 }
1da177e4
LT		 3728
3729 /* entering graphics mode? */
3730 if (entering_gfx) {
3731 hide_cursor(vc);
3732 save_screen(vc);
3733 vc->vc_sw->con_blank(vc, -1, 1);
3734 console_blanked = fg_console + 1;
b6e8f00f 3735 blank_state = blank_off;
1da177e4
LT		 3736 set_origin(vc);
3737 return;
3738 }
3739
b6e8f00f 3740 if (blank_state != blank_normal_wait)
3741 return;
3742 blank_state = blank_off;
3743
1da177e4
LT		 3744 /* don't blank graphics */
3745 if (vc->vc_mode != KD_TEXT) {
3746 console_blanked = fg_console + 1;
3747 return;
3748 }
3749
3750 hide_cursor(vc);
3751 del_timer_sync(&console_timer);
3752 blank_timer_expired = 0;
3753
3754 save_screen(vc);
3755 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3756 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3757 console_blanked = fg_console + 1;
3758 if (i)
3759 set_origin(vc);
3760
3761 if (console_blank_hook && console_blank_hook(1))
3762 return;
3763
d060a321 3764 if (vesa_off_interval && vesa_blank_mode) {
030babac 3765 blank_state = blank_vesa_wait;
1da177e4
LT		 3766 mod_timer(&console_timer, jiffies + vesa_off_interval);
3767 }
8b92e87d 3768 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3769}
3770EXPORT_SYMBOL(do_blank_screen);
3771
3772/*
3773 * Called by timer as well as from vt_console_driver
3774 */
3775void do_unblank_screen(int leaving_gfx)
3776{
3777 struct vc_data *vc;
3778
3779 /* This should now always be called from a "sane" (read: can schedule)
3780 * context for the sake of the low level drivers, except in the special
3781 * case of oops_in_progress
3782 */
3783 if (!oops_in_progress)
3784 might_sleep();
3785
3786 WARN_CONSOLE_UNLOCKED();
3787
3788 ignore_poke = 0;
3789 if (!console_blanked)
3790 return;
3791 if (!vc_cons_allocated(fg_console)) {
3792 /* impossible */
3793 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3794 return;
3795 }
3796 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3797 /* Try to unblank in oops case too */
3798 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3799 return; /* but leave console_blanked != 0 */
3800
3801 if (blankinterval) {
f324edc8 3802 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3803 blank_state = blank_normal_wait;
3804 }
3805
3806 console_blanked = 0;
8fd4bd22 3807 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3808 /* Low-level driver cannot restore -> do it ourselves */
3809 update_screen(vc);
3810 if (console_blank_hook)
3811 console_blank_hook(0);
3812 set_palette(vc);
3813 set_cursor(vc);
8b92e87d 3814 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3815}
3816EXPORT_SYMBOL(do_unblank_screen);
3817
3818/*
3819 * This is called by the outside world to cause a forced unblank, mostly for
3820 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3821 * call it with 1 as an argument and so force a mode restore... that may kill
3822 * X or at least garbage the screen but would also make the Oops visible...
3823 */
3824void unblank_screen(void)
3825{
3826 do_unblank_screen(0);
3827}
3828
3829/*
70522e12 3830 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3831 * (console operations can still happen at irq time, but only from printk which
70522e12 3832 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3833 */
3834static void blank_screen_t(unsigned long dummy)
3835{
cc63b1e1 3836 if (unlikely(!keventd_up())) {
f324edc8 3837 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3838 return;
3839 }
1da177e4
LT		 3840 blank_timer_expired = 1;
3841 schedule_work(&console_work);
3842}
3843
3844void poke_blanked_console(void)
3845{
3846 WARN_CONSOLE_UNLOCKED();
3847
3848 /* Add this so we quickly catch whoever might call us in a non
3849 * safe context. Nowadays, unblank_screen() isn't to be called in
3850 * atomic contexts and is allowed to schedule (with the special case
3851 * of oops_in_progress, but that isn't of any concern for this
3852 * function. --BenH.
3853 */
3854 might_sleep();
3855
3856 /* This isn't perfectly race free, but a race here would be mostly harmless,
3857 * at worse, we'll do a spurrious blank and it's unlikely
3858 */
3859 del_timer(&console_timer);
3860 blank_timer_expired = 0;
3861
3862 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3863 return;
3864 if (console_blanked)
3865 unblank_screen();
3866 else if (blankinterval) {
f324edc8 3867 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3868 blank_state = blank_normal_wait;
3869 }
3870}
3871
3872/*
3873 * Palettes
3874 */
3875
3876static void set_palette(struct vc_data *vc)
3877{
3878 WARN_CONSOLE_UNLOCKED();
3879
3880 if (vc->vc_mode != KD_GRAPHICS)
3881 vc->vc_sw->con_set_palette(vc, color_table);
3882}
3883
3884static int set_get_cmap(unsigned char __user *arg, int set)
3885{
3886 int i, j, k;
3887
3888 WARN_CONSOLE_UNLOCKED();
3889
3890 for (i = 0; i < 16; i++)
3891 if (set) {
3892 get_user(default_red[i], arg++);
3893 get_user(default_grn[i], arg++);
3894 get_user(default_blu[i], arg++);
3895 } else {
3896 put_user(default_red[i], arg++);
3897 put_user(default_grn[i], arg++);
3898 put_user(default_blu[i], arg++);
3899 }
3900 if (set) {
3901 for (i = 0; i < MAX_NR_CONSOLES; i++)
3902 if (vc_cons_allocated(i)) {
3903 for (j = k = 0; j < 16; j++) {
3904 vc_cons[i].d->vc_palette[k++] = default_red[j];
3905 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3906 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3907 }
3908 set_palette(vc_cons[i].d);
3909 }
3910 }
3911 return 0;
3912}
3913
3914/*
3915 * Load palette into the DAC registers. arg points to a colour
3916 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3917 */
3918
3919int con_set_cmap(unsigned char __user *arg)
3920{
3921 int rc;
3922
3923 acquire_console_sem();
3924 rc = set_get_cmap (arg,1);
3925 release_console_sem();
3926
3927 return rc;
3928}
3929
3930int con_get_cmap(unsigned char __user *arg)
3931{
3932 int rc;
3933
3934 acquire_console_sem();
3935 rc = set_get_cmap (arg,0);
3936 release_console_sem();
3937
3938 return rc;
3939}
3940
3941void reset_palette(struct vc_data *vc)
3942{
3943 int j, k;
3944 for (j=k=0; j<16; j++) {
3945 vc->vc_palette[k++] = default_red[j];
3946 vc->vc_palette[k++] = default_grn[j];
3947 vc->vc_palette[k++] = default_blu[j];
3948 }
3949 set_palette(vc);
3950}
3951
3952/*
3953 * Font switching
3954 *
3955 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3956 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3957 * depending on width) reserved for each character which is kinda wasty, but
3958 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3959 * is upto the actual low-level console-driver convert data into its favorite
3960 * format (maybe we should add a `fontoffset' field to the `display'
3961 * structure so we won't have to convert the fontdata all the time.
3962 * /Jes
3963 */
3964
3965#define max_font_size 65536
3966
3967static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3968{
3969 struct console_font font;
3970 int rc = -EINVAL;
3971 int c;
3972
3973 if (vc->vc_mode != KD_TEXT)
3974 return -EINVAL;
3975
3976 if (op->data) {
3977 font.data = kmalloc(max_font_size, GFP_KERNEL);
3978 if (!font.data)
3979 return -ENOMEM;
3980 } else
3981 font.data = NULL;
3982
3983 acquire_console_sem();
3984 if (vc->vc_sw->con_font_get)
3985 rc = vc->vc_sw->con_font_get(vc, &font);
3986 else
3987 rc = -ENOSYS;
3988 release_console_sem();
3989
3990 if (rc)
3991 goto out;
3992
3993 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 3994
1da177e4
LT		 3995 if (op->data && font.charcount > op->charcount)
3996 rc = -ENOSPC;
3997 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3998 if (font.width > op->width || font.height > op->height)
3999 rc = -ENOSPC;
4000 } else {
4001 if (font.width != 8)
4002 rc = -EIO;
4003 else if ((op->height && font.height > op->height) ||
4004 font.height > 32)
4005 rc = -ENOSPC;
4006 }
4007 if (rc)
4008 goto out;
4009
4010 op->height = font.height;
4011 op->width = font.width;
4012 op->charcount = font.charcount;
4013
4014 if (op->data && copy_to_user(op->data, font.data, c))
4015 rc = -EFAULT;
4016
4017out:
4018 kfree(font.data);
4019 return rc;
4020}
4021
4022static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4023{
4024 struct console_font font;
4025 int rc = -EINVAL;
4026 int size;
4027
4028 if (vc->vc_mode != KD_TEXT)
4029 return -EINVAL;
4030 if (!op->data)
4031 return -EINVAL;
4032 if (op->charcount > 512)
4033 return -EINVAL;
4034 if (!op->height) { /* Need to guess font height [compat] */
4035 int h, i;
4036 u8 __user *charmap = op->data;
4037 u8 tmp;
4038
4039 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4040 so that we can get rid of this soon */
4041 if (!(op->flags & KD_FONT_FLAG_OLD))
4042 return -EINVAL;
4043 for (h = 32; h > 0; h--)
4044 for (i = 0; i < op->charcount; i++) {
4045 if (get_user(tmp, &charmap[32*i+h-1]))
4046 return -EFAULT;
4047 if (tmp)
4048 goto nonzero;
4049 }
4050 return -EINVAL;
4051 nonzero:
4052 op->height = h;
4053 }
4054 if (op->width <= 0 || op->width > 32 || op->height > 32)
4055 return -EINVAL;
4056 size = (op->width+7)/8 * 32 * op->charcount;
4057 if (size > max_font_size)
4058 return -ENOSPC;
4059 font.charcount = op->charcount;
4060 font.height = op->height;
4061 font.width = op->width;
9b71ca20
JL		 4062 font.data = memdup_user(op->data, size);
4063 if (IS_ERR(font.data))
4064 return PTR_ERR(font.data);
1da177e4
LT		 4065 acquire_console_sem();
4066 if (vc->vc_sw->con_font_set)
4067 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4068 else
4069 rc = -ENOSYS;
4070 release_console_sem();
4071 kfree(font.data);
4072 return rc;
4073}
4074
4075static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4076{
4077 struct console_font font = {.width = op->width, .height = op->height};
4078 char name[MAX_FONT_NAME];
4079 char *s = name;
4080 int rc;
4081
4082 if (vc->vc_mode != KD_TEXT)
4083 return -EINVAL;
4084
4085 if (!op->data)
4086 s = NULL;
4087 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4088 return -EFAULT;
4089 else
4090 name[MAX_FONT_NAME - 1] = 0;
4091
4092 acquire_console_sem();
4093 if (vc->vc_sw->con_font_default)
4094 rc = vc->vc_sw->con_font_default(vc, &font, s);
4095 else
4096 rc = -ENOSYS;
4097 release_console_sem();
4098 if (!rc) {
4099 op->width = font.width;
4100 op->height = font.height;
4101 }
4102 return rc;
4103}
4104
4105static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4106{
4107 int con = op->height;
4108 int rc;
4109
4110 if (vc->vc_mode != KD_TEXT)
4111 return -EINVAL;
4112
4113 acquire_console_sem();
4114 if (!vc->vc_sw->con_font_copy)
4115 rc = -ENOSYS;
4116 else if (con < 0 || !vc_cons_allocated(con))
4117 rc = -ENOTTY;
4118 else if (con == vc->vc_num) /* nothing to do */
4119 rc = 0;
4120 else
4121 rc = vc->vc_sw->con_font_copy(vc, con);
4122 release_console_sem();
4123 return rc;
4124}
4125
4126int con_font_op(struct vc_data *vc, struct console_font_op *op)
4127{
4128 switch (op->op) {
4129 case KD_FONT_OP_SET:
4130 return con_font_set(vc, op);
4131 case KD_FONT_OP_GET:
4132 return con_font_get(vc, op);
4133 case KD_FONT_OP_SET_DEFAULT:
4134 return con_font_default(vc, op);
4135 case KD_FONT_OP_COPY:
4136 return con_font_copy(vc, op);
4137 }
4138 return -ENOSYS;
4139}
4140
4141/*
4142 * Interface exported to selection and vcs.
4143 */
4144
4145/* used by selection */
4146u16 screen_glyph(struct vc_data *vc, int offset)
4147{
4148 u16 w = scr_readw(screenpos(vc, offset, 1));
4149 u16 c = w & 0xff;
4150
4151 if (w & vc->vc_hi_font_mask)
4152 c |= 0x100;
4153 return c;
4154}
f7511d5f 4155EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4156
4157/* used by vcs - note the word offset */
4158unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4159{
4160 return screenpos(vc, 2 * w_offset, viewed);
4161}
4162
4163void getconsxy(struct vc_data *vc, unsigned char *p)
4164{
4165 p[0] = vc->vc_x;
4166 p[1] = vc->vc_y;
4167}
4168
4169void putconsxy(struct vc_data *vc, unsigned char *p)
4170{
9477e260 4171 hide_cursor(vc);
1da177e4
LT		 4172 gotoxy(vc, p[0], p[1]);
4173 set_cursor(vc);
4174}
4175
4176u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4177{
4178 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4179 return softcursor_original;
4180 return scr_readw(org);
4181}
4182
4183void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4184{
4185 scr_writew(val, org);
4186 if ((unsigned long)org == vc->vc_pos) {
4187 softcursor_original = -1;
4188 add_softcursor(vc);
4189 }
4190}
4191
4192/*
4193 * Visible symbols for modules
4194 */
4195
4196EXPORT_SYMBOL(color_table);
4197EXPORT_SYMBOL(default_red);
4198EXPORT_SYMBOL(default_grn);
4199EXPORT_SYMBOL(default_blu);
4200EXPORT_SYMBOL(update_region);
4201EXPORT_SYMBOL(redraw_screen);
4202EXPORT_SYMBOL(vc_resize);
4203EXPORT_SYMBOL(fg_console);
4204EXPORT_SYMBOL(console_blank_hook);
4205EXPORT_SYMBOL(console_blanked);
4206EXPORT_SYMBOL(vc_cons);
f6c06b68 4207EXPORT_SYMBOL(global_cursor_default);
1da177e4
LT		 4208#ifndef VT_SINGLE_DRIVER
4209EXPORT_SYMBOL(take_over_console);
4210EXPORT_SYMBOL(give_up_console);
4211#endif
Linux kernel - Deliverables
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