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vt,console,kdb: implement atomic console enter/leave functions
[linux-2.6/kvm.git] / drivers / char / vt.c
blob117ce99115dc1cfe8e36d7e16768738de9625dbd
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
62 * deletion SMP-safe. 17Jun00, Andrew Morton
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
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
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>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/smp_lock.h>
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>
98 #include <linux/workqueue.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103 #include <linux/device.h>
104 #include <linux/io.h>
105 #include <asm/system.h>
106 #include <linux/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164 int global_cursor_default = -1;
165 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
166
167 static int cur_default = CUR_DEFAULT;
168 module_param(cur_default, int, S_IRUGO | S_IWUSR);
169
170 /*
171 * ignore_poke: don't unblank the screen when things are typed. This is
172 * mainly for the privacy of braille terminal users.
173 */
174 static int ignore_poke;
175
176 int do_poke_blanked_console;
177 int console_blanked;
178
179 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
180 static int vesa_off_interval;
181 static int blankinterval = 10*60;
182 core_param(consoleblank, blankinterval, int, 0444);
183
184 static DECLARE_WORK(console_work, console_callback);
185
186 /*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * saved_* variants are for save/restore around kernel debugger enter/leave
191 */
192 int fg_console;
193 int last_console;
194 int want_console = -1;
195 int saved_fg_console;
196 int saved_last_console;
197 int saved_want_console;
198 int saved_vc_mode;
199
200 /*
201 * For each existing display, we have a pointer to console currently visible
202 * on that display, allowing consoles other than fg_console to be refreshed
203 * appropriately. Unless the low-level driver supplies its own display_fg
204 * variable, we use this one for the "master display".
205 */
206 static struct vc_data *master_display_fg;
207
208 /*
209 * Unfortunately, we need to delay tty echo when we're currently writing to the
210 * console since the code is (and always was) not re-entrant, so we schedule
211 * all flip requests to process context with schedule-task() and run it from
212 * console_callback().
213 */
214
215 /*
216 * For the same reason, we defer scrollback to the console callback.
217 */
218 static int scrollback_delta;
219
220 /*
221 * Hook so that the power management routines can (un)blank
222 * the console on our behalf.
223 */
224 int (*console_blank_hook)(int);
225
226 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
227 static int blank_state;
228 static int blank_timer_expired;
229 enum {
230 blank_off = 0,
231 blank_normal_wait,
232 blank_vesa_wait,
233 };
234
235 /*
236 * Notifier list for console events.
237 */
238 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
239
240 int register_vt_notifier(struct notifier_block *nb)
241 {
242 return atomic_notifier_chain_register(&vt_notifier_list, nb);
243 }
244 EXPORT_SYMBOL_GPL(register_vt_notifier);
245
246 int unregister_vt_notifier(struct notifier_block *nb)
247 {
248 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
249 }
250 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
251
252 static void notify_write(struct vc_data *vc, unsigned int unicode)
253 {
254 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
255 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
256 }
257
258 static void notify_update(struct vc_data *vc)
259 {
260 struct vt_notifier_param param = { .vc = vc };
261 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
262 }
263 /*
264 * Low-Level Functions
265 */
266
267 #define IS_FG(vc) ((vc)->vc_num == fg_console)
268
269 #ifdef VT_BUF_VRAM_ONLY
270 #define DO_UPDATE(vc) 0
271 #else
272 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
273 #endif
274
275 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
276 {
277 unsigned short *p;
278
279 if (!viewed)
280 p = (unsigned short *)(vc->vc_origin + offset);
281 else if (!vc->vc_sw->con_screen_pos)
282 p = (unsigned short *)(vc->vc_visible_origin + offset);
283 else
284 p = vc->vc_sw->con_screen_pos(vc, offset);
285 return p;
286 }
287
288 static inline void scrolldelta(int lines)
289 {
290 scrollback_delta += lines;
291 schedule_console_callback();
292 }
293
294 void schedule_console_callback(void)
295 {
296 schedule_work(&console_work);
297 }
298
299 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
300 {
301 unsigned short *d, *s;
302
303 if (t+nr >= b)
304 nr = b - t - 1;
305 if (b > vc->vc_rows || t >= b || nr < 1)
306 return;
307 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
308 return;
309 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
310 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
311 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
312 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
313 vc->vc_size_row * nr);
314 }
315
316 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
317 {
318 unsigned short *s;
319 unsigned int step;
320
321 if (t+nr >= b)
322 nr = b - t - 1;
323 if (b > vc->vc_rows || t >= b || nr < 1)
324 return;
325 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
326 return;
327 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
328 step = vc->vc_cols * nr;
329 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
330 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
331 }
332
333 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
334 {
335 #ifndef VT_BUF_VRAM_ONLY
336 unsigned int xx, yy, offset;
337 u16 *p;
338
339 p = (u16 *) start;
340 if (!vc->vc_sw->con_getxy) {
341 offset = (start - vc->vc_origin) / 2;
342 xx = offset % vc->vc_cols;
343 yy = offset / vc->vc_cols;
344 } else {
345 int nxx, nyy;
346 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
347 xx = nxx; yy = nyy;
348 }
349 for(;;) {
350 u16 attrib = scr_readw(p) & 0xff00;
351 int startx = xx;
352 u16 *q = p;
353 while (xx < vc->vc_cols && count) {
354 if (attrib != (scr_readw(p) & 0xff00)) {
355 if (p > q)
356 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
357 startx = xx;
358 q = p;
359 attrib = scr_readw(p) & 0xff00;
360 }
361 p++;
362 xx++;
363 count--;
364 }
365 if (p > q)
366 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
367 if (!count)
368 break;
369 xx = 0;
370 yy++;
371 if (vc->vc_sw->con_getxy) {
372 p = (u16 *)start;
373 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
374 }
375 }
376 #endif
377 }
378
379 void update_region(struct vc_data *vc, unsigned long start, int count)
380 {
381 WARN_CONSOLE_UNLOCKED();
382
383 if (DO_UPDATE(vc)) {
384 hide_cursor(vc);
385 do_update_region(vc, start, count);
386 set_cursor(vc);
387 }
388 }
389
390 /* Structure of attributes is hardware-dependent */
391
392 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
393 u8 _underline, u8 _reverse, u8 _italic)
394 {
395 if (vc->vc_sw->con_build_attr)
396 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
397 _blink, _underline, _reverse, _italic);
398
399 #ifndef VT_BUF_VRAM_ONLY
400 /*
401 * ++roman: I completely changed the attribute format for monochrome
402 * mode (!can_do_color). The formerly used MDA (monochrome display
403 * adapter) format didn't allow the combination of certain effects.
404 * Now the attribute is just a bit vector:
405 * Bit 0..1: intensity (0..2)
406 * Bit 2 : underline
407 * Bit 3 : reverse
408 * Bit 7 : blink
409 */
410 {
411 u8 a = _color;
412 if (!vc->vc_can_do_color)
413 return _intensity |
414 (_italic ? 2 : 0) |
415 (_underline ? 4 : 0) |
416 (_reverse ? 8 : 0) |
417 (_blink ? 0x80 : 0);
418 if (_italic)
419 a = (a & 0xF0) | vc->vc_itcolor;
420 else if (_underline)
421 a = (a & 0xf0) | vc->vc_ulcolor;
422 else if (_intensity == 0)
423 a = (a & 0xf0) | vc->vc_ulcolor;
424 if (_reverse)
425 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
426 if (_blink)
427 a ^= 0x80;
428 if (_intensity == 2)
429 a ^= 0x08;
430 if (vc->vc_hi_font_mask == 0x100)
431 a <<= 1;
432 return a;
433 }
434 #else
435 return 0;
436 #endif
437 }
438
439 static void update_attr(struct vc_data *vc)
440 {
441 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
442 vc->vc_blink, vc->vc_underline,
443 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
444 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
445 }
446
447 /* Note: inverting the screen twice should revert to the original state */
448 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
449 {
450 unsigned short *p;
451
452 WARN_CONSOLE_UNLOCKED();
453
454 count /= 2;
455 p = screenpos(vc, offset, viewed);
456 if (vc->vc_sw->con_invert_region)
457 vc->vc_sw->con_invert_region(vc, p, count);
458 #ifndef VT_BUF_VRAM_ONLY
459 else {
460 u16 *q = p;
461 int cnt = count;
462 u16 a;
463
464 if (!vc->vc_can_do_color) {
465 while (cnt--) {
466 a = scr_readw(q);
467 a ^= 0x0800;
468 scr_writew(a, q);
469 q++;
470 }
471 } else if (vc->vc_hi_font_mask == 0x100) {
472 while (cnt--) {
473 a = scr_readw(q);
474 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
475 scr_writew(a, q);
476 q++;
477 }
478 } else {
479 while (cnt--) {
480 a = scr_readw(q);
481 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
482 scr_writew(a, q);
483 q++;
484 }
485 }
486 }
487 #endif
488 if (DO_UPDATE(vc))
489 do_update_region(vc, (unsigned long) p, count);
490 }
491
492 /* used by selection: complement pointer position */
493 void complement_pos(struct vc_data *vc, int offset)
494 {
495 static int old_offset = -1;
496 static unsigned short old;
497 static unsigned short oldx, oldy;
498
499 WARN_CONSOLE_UNLOCKED();
500
501 if (old_offset != -1 && old_offset >= 0 &&
502 old_offset < vc->vc_screenbuf_size) {
503 scr_writew(old, screenpos(vc, old_offset, 1));
504 if (DO_UPDATE(vc))
505 vc->vc_sw->con_putc(vc, old, oldy, oldx);
506 }
507
508 old_offset = offset;
509
510 if (offset != -1 && offset >= 0 &&
511 offset < vc->vc_screenbuf_size) {
512 unsigned short new;
513 unsigned short *p;
514 p = screenpos(vc, offset, 1);
515 old = scr_readw(p);
516 new = old ^ vc->vc_complement_mask;
517 scr_writew(new, p);
518 if (DO_UPDATE(vc)) {
519 oldx = (offset >> 1) % vc->vc_cols;
520 oldy = (offset >> 1) / vc->vc_cols;
521 vc->vc_sw->con_putc(vc, new, oldy, oldx);
522 }
523 }
524
525 }
526
527 static void insert_char(struct vc_data *vc, unsigned int nr)
528 {
529 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
530
531 p = q + vc->vc_cols - nr - vc->vc_x;
532 while (--p >= q)
533 scr_writew(scr_readw(p), p + nr);
534 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
535 vc->vc_need_wrap = 0;
536 if (DO_UPDATE(vc)) {
537 unsigned short oldattr = vc->vc_attr;
538 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
539 vc->vc_cols - vc->vc_x - nr);
540 vc->vc_attr = vc->vc_video_erase_char >> 8;
541 while (nr--)
542 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
543 vc->vc_attr = oldattr;
544 }
545 }
546
547 static void delete_char(struct vc_data *vc, unsigned int nr)
548 {
549 unsigned int i = vc->vc_x;
550 unsigned short *p = (unsigned short *)vc->vc_pos;
551
552 while (++i <= vc->vc_cols - nr) {
553 scr_writew(scr_readw(p+nr), p);
554 p++;
555 }
556 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
557 vc->vc_need_wrap = 0;
558 if (DO_UPDATE(vc)) {
559 unsigned short oldattr = vc->vc_attr;
560 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
561 vc->vc_cols - vc->vc_x - nr);
562 vc->vc_attr = vc->vc_video_erase_char >> 8;
563 while (nr--)
564 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
565 vc->vc_cols - 1 - nr);
566 vc->vc_attr = oldattr;
567 }
568 }
569
570 static int softcursor_original;
571
572 static void add_softcursor(struct vc_data *vc)
573 {
574 int i = scr_readw((u16 *) vc->vc_pos);
575 u32 type = vc->vc_cursor_type;
576
577 if (! (type & 0x10)) return;
578 if (softcursor_original != -1) return;
579 softcursor_original = i;
580 i |= ((type >> 8) & 0xff00 );
581 i ^= ((type) & 0xff00 );
582 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
583 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
584 scr_writew(i, (u16 *) vc->vc_pos);
585 if (DO_UPDATE(vc))
586 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
587 }
588
589 static void hide_softcursor(struct vc_data *vc)
590 {
591 if (softcursor_original != -1) {
592 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
593 if (DO_UPDATE(vc))
594 vc->vc_sw->con_putc(vc, softcursor_original,
595 vc->vc_y, vc->vc_x);
596 softcursor_original = -1;
597 }
598 }
599
600 static void hide_cursor(struct vc_data *vc)
601 {
602 if (vc == sel_cons)
603 clear_selection();
604 vc->vc_sw->con_cursor(vc, CM_ERASE);
605 hide_softcursor(vc);
606 }
607
608 static void set_cursor(struct vc_data *vc)
609 {
610 if (!IS_FG(vc) || console_blanked ||
611 vc->vc_mode == KD_GRAPHICS)
612 return;
613 if (vc->vc_deccm) {
614 if (vc == sel_cons)
615 clear_selection();
616 add_softcursor(vc);
617 if ((vc->vc_cursor_type & 0x0f) != 1)
618 vc->vc_sw->con_cursor(vc, CM_DRAW);
619 } else
620 hide_cursor(vc);
621 }
622
623 static void set_origin(struct vc_data *vc)
624 {
625 WARN_CONSOLE_UNLOCKED();
626
627 if (!CON_IS_VISIBLE(vc) ||
628 !vc->vc_sw->con_set_origin ||
629 !vc->vc_sw->con_set_origin(vc))
630 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
631 vc->vc_visible_origin = vc->vc_origin;
632 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
633 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
634 }
635
636 static inline void save_screen(struct vc_data *vc)
637 {
638 WARN_CONSOLE_UNLOCKED();
639
640 if (vc->vc_sw->con_save_screen)
641 vc->vc_sw->con_save_screen(vc);
642 }
643
644 /*
645 * Redrawing of screen
646 */
647
648 static void clear_buffer_attributes(struct vc_data *vc)
649 {
650 unsigned short *p = (unsigned short *)vc->vc_origin;
651 int count = vc->vc_screenbuf_size / 2;
652 int mask = vc->vc_hi_font_mask | 0xff;
653
654 for (; count > 0; count--, p++) {
655 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
656 }
657 }
658
659 void redraw_screen(struct vc_data *vc, int is_switch)
660 {
661 int redraw = 0;
662
663 WARN_CONSOLE_UNLOCKED();
664
665 if (!vc) {
666 /* strange ... */
667 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
668 return;
669 }
670
671 if (is_switch) {
672 struct vc_data *old_vc = vc_cons[fg_console].d;
673 if (old_vc == vc)
674 return;
675 if (!CON_IS_VISIBLE(vc))
676 redraw = 1;
677 *vc->vc_display_fg = vc;
678 fg_console = vc->vc_num;
679 hide_cursor(old_vc);
680 if (!CON_IS_VISIBLE(old_vc)) {
681 save_screen(old_vc);
682 set_origin(old_vc);
683 }
684 } else {
685 hide_cursor(vc);
686 redraw = 1;
687 }
688
689 if (redraw) {
690 int update;
691 int old_was_color = vc->vc_can_do_color;
692
693 set_origin(vc);
694 update = vc->vc_sw->con_switch(vc);
695 set_palette(vc);
696 /*
697 * If console changed from mono<->color, the best we can do
698 * is to clear the buffer attributes. As it currently stands,
699 * rebuilding new attributes from the old buffer is not doable
700 * without overly complex code.
701 */
702 if (old_was_color != vc->vc_can_do_color) {
703 update_attr(vc);
704 clear_buffer_attributes(vc);
705 }
706 if (update && vc->vc_mode != KD_GRAPHICS)
707 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
708 }
709 set_cursor(vc);
710 if (is_switch) {
711 set_leds();
712 compute_shiftstate();
713 notify_update(vc);
714 }
715 }
716
717 /*
718 * Allocation, freeing and resizing of VTs.
719 */
720
721 int vc_cons_allocated(unsigned int i)
722 {
723 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
724 }
725
726 static void visual_init(struct vc_data *vc, int num, int init)
727 {
728 /* ++Geert: vc->vc_sw->con_init determines console size */
729 if (vc->vc_sw)
730 module_put(vc->vc_sw->owner);
731 vc->vc_sw = conswitchp;
732 #ifndef VT_SINGLE_DRIVER
733 if (con_driver_map[num])
734 vc->vc_sw = con_driver_map[num];
735 #endif
736 __module_get(vc->vc_sw->owner);
737 vc->vc_num = num;
738 vc->vc_display_fg = &master_display_fg;
739 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
740 vc->vc_uni_pagedir = 0;
741 vc->vc_hi_font_mask = 0;
742 vc->vc_complement_mask = 0;
743 vc->vc_can_do_color = 0;
744 vc->vc_sw->con_init(vc, init);
745 if (!vc->vc_complement_mask)
746 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
747 vc->vc_s_complement_mask = vc->vc_complement_mask;
748 vc->vc_size_row = vc->vc_cols << 1;
749 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
750 }
751
752 int vc_allocate(unsigned int currcons) /* return 0 on success */
753 {
754 WARN_CONSOLE_UNLOCKED();
755
756 if (currcons >= MAX_NR_CONSOLES)
757 return -ENXIO;
758 if (!vc_cons[currcons].d) {
759 struct vc_data *vc;
760 struct vt_notifier_param param;
761
762 /* prevent users from taking too much memory */
763 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
764 return -EPERM;
765
766 /* due to the granularity of kmalloc, we waste some memory here */
767 /* the alloc is done in two steps, to optimize the common situation
768 of a 25x80 console (structsize=216, screenbuf_size=4000) */
769 /* although the numbers above are not valid since long ago, the
770 point is still up-to-date and the comment still has its value
771 even if only as a historical artifact. --mj, July 1998 */
772 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
773 if (!vc)
774 return -ENOMEM;
775 vc_cons[currcons].d = vc;
776 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
777 visual_init(vc, currcons, 1);
778 if (!*vc->vc_uni_pagedir_loc)
779 con_set_default_unimap(vc);
780 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
781 if (!vc->vc_screenbuf) {
782 kfree(vc);
783 vc_cons[currcons].d = NULL;
784 return -ENOMEM;
785 }
786
787 /* If no drivers have overridden us and the user didn't pass a
788 boot option, default to displaying the cursor */
789 if (global_cursor_default == -1)
790 global_cursor_default = 1;
791
792 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
793 vcs_make_sysfs(currcons);
794 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
795 }
796 return 0;
797 }
798
799 static inline int resize_screen(struct vc_data *vc, int width, int height,
800 int user)
801 {
802 /* Resizes the resolution of the display adapater */
803 int err = 0;
804
805 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
806 err = vc->vc_sw->con_resize(vc, width, height, user);
807
808 return err;
809 }
810
811 /*
812 * Change # of rows and columns (0 means unchanged/the size of fg_console)
813 * [this is to be used together with some user program
814 * like resize that changes the hardware videomode]
815 */
816 #define VC_RESIZE_MAXCOL (32767)
817 #define VC_RESIZE_MAXROW (32767)
818
819 /**
820 * vc_do_resize - resizing method for the tty
821 * @tty: tty being resized
822 * @real_tty: real tty (different to tty if a pty/tty pair)
823 * @vc: virtual console private data
824 * @cols: columns
825 * @lines: lines
826 *
827 * Resize a virtual console, clipping according to the actual constraints.
828 * If the caller passes a tty structure then update the termios winsize
829 * information and perform any necessary signal handling.
830 *
831 * Caller must hold the console semaphore. Takes the termios mutex and
832 * ctrl_lock of the tty IFF a tty is passed.
833 */
834
835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
836 unsigned int cols, unsigned int lines)
837 {
838 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
839 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
840 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
841 unsigned int end, user;
842 unsigned short *newscreen;
843
844 WARN_CONSOLE_UNLOCKED();
845
846 if (!vc)
847 return -ENXIO;
848
849 user = vc->vc_resize_user;
850 vc->vc_resize_user = 0;
851
852 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
853 return -EINVAL;
854
855 new_cols = (cols ? cols : vc->vc_cols);
856 new_rows = (lines ? lines : vc->vc_rows);
857 new_row_size = new_cols << 1;
858 new_screen_size = new_row_size * new_rows;
859
860 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
861 return 0;
862
863 newscreen = kmalloc(new_screen_size, GFP_USER);
864 if (!newscreen)
865 return -ENOMEM;
866
867 old_rows = vc->vc_rows;
868 old_cols = vc->vc_cols;
869 old_row_size = vc->vc_size_row;
870 old_screen_size = vc->vc_screenbuf_size;
871
872 err = resize_screen(vc, new_cols, new_rows, user);
873 if (err) {
874 kfree(newscreen);
875 return err;
876 }
877
878 vc->vc_rows = new_rows;
879 vc->vc_cols = new_cols;
880 vc->vc_size_row = new_row_size;
881 vc->vc_screenbuf_size = new_screen_size;
882
883 rlth = min(old_row_size, new_row_size);
884 rrem = new_row_size - rlth;
885 old_origin = vc->vc_origin;
886 new_origin = (long) newscreen;
887 new_scr_end = new_origin + new_screen_size;
888
889 if (vc->vc_y > new_rows) {
890 if (old_rows - vc->vc_y < new_rows) {
891 /*
892 * Cursor near the bottom, copy contents from the
893 * bottom of buffer
894 */
895 old_origin += (old_rows - new_rows) * old_row_size;
896 end = vc->vc_scr_end;
897 } else {
898 /*
899 * Cursor is in no man's land, copy 1/2 screenful
900 * from the top and bottom of cursor position
901 */
902 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
903 end = old_origin + (old_row_size * new_rows);
904 }
905 } else
906 /*
907 * Cursor near the top, copy contents from the top of buffer
908 */
909 end = (old_rows > new_rows) ? old_origin +
910 (old_row_size * new_rows) :
911 vc->vc_scr_end;
912
913 update_attr(vc);
914
915 while (old_origin < end) {
916 scr_memcpyw((unsigned short *) new_origin,
917 (unsigned short *) old_origin, rlth);
918 if (rrem)
919 scr_memsetw((void *)(new_origin + rlth),
920 vc->vc_video_erase_char, rrem);
921 old_origin += old_row_size;
922 new_origin += new_row_size;
923 }
924 if (new_scr_end > new_origin)
925 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
926 new_scr_end - new_origin);
927 kfree(vc->vc_screenbuf);
928 vc->vc_screenbuf = newscreen;
929 vc->vc_screenbuf_size = new_screen_size;
930 set_origin(vc);
931
932 /* do part of a reset_terminal() */
933 vc->vc_top = 0;
934 vc->vc_bottom = vc->vc_rows;
935 gotoxy(vc, vc->vc_x, vc->vc_y);
936 save_cur(vc);
937
938 if (tty) {
939 /* Rewrite the requested winsize data with the actual
940 resulting sizes */
941 struct winsize ws;
942 memset(&ws, 0, sizeof(ws));
943 ws.ws_row = vc->vc_rows;
944 ws.ws_col = vc->vc_cols;
945 ws.ws_ypixel = vc->vc_scan_lines;
946 tty_do_resize(tty, &ws);
947 }
948
949 if (CON_IS_VISIBLE(vc))
950 update_screen(vc);
951 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
952 return err;
953 }
954
955 /**
956 * vc_resize - resize a VT
957 * @vc: virtual console
958 * @cols: columns
959 * @rows: rows
960 *
961 * Resize a virtual console as seen from the console end of things. We
962 * use the common vc_do_resize methods to update the structures. The
963 * caller must hold the console sem to protect console internals and
964 * vc->vc_tty
965 */
966
967 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
968 {
969 return vc_do_resize(vc->vc_tty, vc, cols, rows);
970 }
971
972 /**
973 * vt_resize - resize a VT
974 * @tty: tty to resize
975 * @ws: winsize attributes
976 *
977 * Resize a virtual terminal. This is called by the tty layer as we
978 * register our own handler for resizing. The mutual helper does all
979 * the actual work.
980 *
981 * Takes the console sem and the called methods then take the tty
982 * termios_mutex and the tty ctrl_lock in that order.
983 */
984 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
985 {
986 struct vc_data *vc = tty->driver_data;
987 int ret;
988
989 acquire_console_sem();
990 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
991 release_console_sem();
992 return ret;
993 }
994
995 void vc_deallocate(unsigned int currcons)
996 {
997 WARN_CONSOLE_UNLOCKED();
998
999 if (vc_cons_allocated(currcons)) {
1000 struct vc_data *vc = vc_cons[currcons].d;
1001 struct vt_notifier_param param = { .vc = vc };
1002
1003 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1004 vcs_remove_sysfs(currcons);
1005 vc->vc_sw->con_deinit(vc);
1006 put_pid(vc->vt_pid);
1007 module_put(vc->vc_sw->owner);
1008 kfree(vc->vc_screenbuf);
1009 if (currcons >= MIN_NR_CONSOLES)
1010 kfree(vc);
1011 vc_cons[currcons].d = NULL;
1012 }
1013 }
1014
1015 /*
1016 * VT102 emulator
1017 */
1018
1019 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1020 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1021 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1022
1023 #define decarm VC_REPEAT
1024 #define decckm VC_CKMODE
1025 #define kbdapplic VC_APPLIC
1026 #define lnm VC_CRLF
1027
1028 /*
1029 * this is what the terminal answers to a ESC-Z or csi0c query.
1030 */
1031 #define VT100ID "\033[?1;2c"
1032 #define VT102ID "\033[?6c"
1033
1034 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1035 8,12,10,14, 9,13,11,15 };
1036
1037 /* the default colour table, for VGA+ colour systems */
1038 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1039 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1040 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1041 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1042 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1043 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1044
1045 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1046 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1047 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1048
1049 /*
1050 * gotoxy() must verify all boundaries, because the arguments
1051 * might also be negative. If the given position is out of
1052 * bounds, the cursor is placed at the nearest margin.
1053 */
1054 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1055 {
1056 int min_y, max_y;
1057
1058 if (new_x < 0)
1059 vc->vc_x = 0;
1060 else {
1061 if (new_x >= vc->vc_cols)
1062 vc->vc_x = vc->vc_cols - 1;
1063 else
1064 vc->vc_x = new_x;
1065 }
1066
1067 if (vc->vc_decom) {
1068 min_y = vc->vc_top;
1069 max_y = vc->vc_bottom;
1070 } else {
1071 min_y = 0;
1072 max_y = vc->vc_rows;
1073 }
1074 if (new_y < min_y)
1075 vc->vc_y = min_y;
1076 else if (new_y >= max_y)
1077 vc->vc_y = max_y - 1;
1078 else
1079 vc->vc_y = new_y;
1080 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1081 vc->vc_need_wrap = 0;
1082 }
1083
1084 /* for absolute user moves, when decom is set */
1085 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1086 {
1087 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1088 }
1089
1090 void scrollback(struct vc_data *vc, int lines)
1091 {
1092 if (!lines)
1093 lines = vc->vc_rows / 2;
1094 scrolldelta(-lines);
1095 }
1096
1097 void scrollfront(struct vc_data *vc, int lines)
1098 {
1099 if (!lines)
1100 lines = vc->vc_rows / 2;
1101 scrolldelta(lines);
1102 }
1103
1104 static void lf(struct vc_data *vc)
1105 {
1106 /* don't scroll if above bottom of scrolling region, or
1107 * if below scrolling region
1108 */
1109 if (vc->vc_y + 1 == vc->vc_bottom)
1110 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1111 else if (vc->vc_y < vc->vc_rows - 1) {
1112 vc->vc_y++;
1113 vc->vc_pos += vc->vc_size_row;
1114 }
1115 vc->vc_need_wrap = 0;
1116 notify_write(vc, '\n');
1117 }
1118
1119 static void ri(struct vc_data *vc)
1120 {
1121 /* don't scroll if below top of scrolling region, or
1122 * if above scrolling region
1123 */
1124 if (vc->vc_y == vc->vc_top)
1125 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1126 else if (vc->vc_y > 0) {
1127 vc->vc_y--;
1128 vc->vc_pos -= vc->vc_size_row;
1129 }
1130 vc->vc_need_wrap = 0;
1131 }
1132
1133 static inline void cr(struct vc_data *vc)
1134 {
1135 vc->vc_pos -= vc->vc_x << 1;
1136 vc->vc_need_wrap = vc->vc_x = 0;
1137 notify_write(vc, '\r');
1138 }
1139
1140 static inline void bs(struct vc_data *vc)
1141 {
1142 if (vc->vc_x) {
1143 vc->vc_pos -= 2;
1144 vc->vc_x--;
1145 vc->vc_need_wrap = 0;
1146 notify_write(vc, '\b');
1147 }
1148 }
1149
1150 static inline void del(struct vc_data *vc)
1151 {
1152 /* ignored */
1153 }
1154
1155 static void csi_J(struct vc_data *vc, int vpar)
1156 {
1157 unsigned int count;
1158 unsigned short * start;
1159
1160 switch (vpar) {
1161 case 0: /* erase from cursor to end of display */
1162 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1163 start = (unsigned short *)vc->vc_pos;
1164 if (DO_UPDATE(vc)) {
1165 /* do in two stages */
1166 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1167 vc->vc_cols - vc->vc_x);
1168 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1169 vc->vc_rows - vc->vc_y - 1,
1170 vc->vc_cols);
1171 }
1172 break;
1173 case 1: /* erase from start to cursor */
1174 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1175 start = (unsigned short *)vc->vc_origin;
1176 if (DO_UPDATE(vc)) {
1177 /* do in two stages */
1178 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1179 vc->vc_cols);
1180 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1181 vc->vc_x + 1);
1182 }
1183 break;
1184 case 2: /* erase whole display */
1185 count = vc->vc_cols * vc->vc_rows;
1186 start = (unsigned short *)vc->vc_origin;
1187 if (DO_UPDATE(vc))
1188 vc->vc_sw->con_clear(vc, 0, 0,
1189 vc->vc_rows,
1190 vc->vc_cols);
1191 break;
1192 default:
1193 return;
1194 }
1195 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1196 vc->vc_need_wrap = 0;
1197 }
1198
1199 static void csi_K(struct vc_data *vc, int vpar)
1200 {
1201 unsigned int count;
1202 unsigned short * start;
1203
1204 switch (vpar) {
1205 case 0: /* erase from cursor to end of line */
1206 count = vc->vc_cols - vc->vc_x;
1207 start = (unsigned short *)vc->vc_pos;
1208 if (DO_UPDATE(vc))
1209 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1210 vc->vc_cols - vc->vc_x);
1211 break;
1212 case 1: /* erase from start of line to cursor */
1213 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1214 count = vc->vc_x + 1;
1215 if (DO_UPDATE(vc))
1216 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1217 vc->vc_x + 1);
1218 break;
1219 case 2: /* erase whole line */
1220 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1221 count = vc->vc_cols;
1222 if (DO_UPDATE(vc))
1223 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1224 vc->vc_cols);
1225 break;
1226 default:
1227 return;
1228 }
1229 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1230 vc->vc_need_wrap = 0;
1231 }
1232
1233 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1234 { /* not vt100? */
1235 int count;
1236
1237 if (!vpar)
1238 vpar++;
1239 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1240
1241 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1242 if (DO_UPDATE(vc))
1243 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1244 vc->vc_need_wrap = 0;
1245 }
1246
1247 static void default_attr(struct vc_data *vc)
1248 {
1249 vc->vc_intensity = 1;
1250 vc->vc_italic = 0;
1251 vc->vc_underline = 0;
1252 vc->vc_reverse = 0;
1253 vc->vc_blink = 0;
1254 vc->vc_color = vc->vc_def_color;
1255 }
1256
1257 /* console_sem is held */
1258 static void csi_m(struct vc_data *vc)
1259 {
1260 int i;
1261
1262 for (i = 0; i <= vc->vc_npar; i++)
1263 switch (vc->vc_par[i]) {
1264 case 0: /* all attributes off */
1265 default_attr(vc);
1266 break;
1267 case 1:
1268 vc->vc_intensity = 2;
1269 break;
1270 case 2:
1271 vc->vc_intensity = 0;
1272 break;
1273 case 3:
1274 vc->vc_italic = 1;
1275 break;
1276 case 4:
1277 vc->vc_underline = 1;
1278 break;
1279 case 5:
1280 vc->vc_blink = 1;
1281 break;
1282 case 7:
1283 vc->vc_reverse = 1;
1284 break;
1285 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1286 * Select primary font, don't display
1287 * control chars if defined, don't set
1288 * bit 8 on output.
1289 */
1290 vc->vc_translate = set_translate(vc->vc_charset == 0
1291 ? vc->vc_G0_charset
1292 : vc->vc_G1_charset, vc);
1293 vc->vc_disp_ctrl = 0;
1294 vc->vc_toggle_meta = 0;
1295 break;
1296 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1297 * Select first alternate font, lets
1298 * chars < 32 be displayed as ROM chars.
1299 */
1300 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1301 vc->vc_disp_ctrl = 1;
1302 vc->vc_toggle_meta = 0;
1303 break;
1304 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1305 * Select second alternate font, toggle
1306 * high bit before displaying as ROM char.
1307 */
1308 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1309 vc->vc_disp_ctrl = 1;
1310 vc->vc_toggle_meta = 1;
1311 break;
1312 case 21:
1313 case 22:
1314 vc->vc_intensity = 1;
1315 break;
1316 case 23:
1317 vc->vc_italic = 0;
1318 break;
1319 case 24:
1320 vc->vc_underline = 0;
1321 break;
1322 case 25:
1323 vc->vc_blink = 0;
1324 break;
1325 case 27:
1326 vc->vc_reverse = 0;
1327 break;
1328 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1329 * Enables underscore, white foreground
1330 * with white underscore (Linux - use
1331 * default foreground).
1332 */
1333 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1334 vc->vc_underline = 1;
1335 break;
1336 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1337 * Disable underline option.
1338 * Reset colour to default? It did this
1339 * before...
1340 */
1341 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1342 vc->vc_underline = 0;
1343 break;
1344 case 49:
1345 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1346 break;
1347 default:
1348 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1349 vc->vc_color = color_table[vc->vc_par[i] - 30]
1350 | (vc->vc_color & 0xf0);
1351 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1352 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1353 | (vc->vc_color & 0x0f);
1354 break;
1355 }
1356 update_attr(vc);
1357 }
1358
1359 static void respond_string(const char *p, struct tty_struct *tty)
1360 {
1361 while (*p) {
1362 tty_insert_flip_char(tty, *p, 0);
1363 p++;
1364 }
1365 con_schedule_flip(tty);
1366 }
1367
1368 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1369 {
1370 char buf[40];
1371
1372 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1373 respond_string(buf, tty);
1374 }
1375
1376 static inline void status_report(struct tty_struct *tty)
1377 {
1378 respond_string("\033[0n", tty); /* Terminal ok */
1379 }
1380
1381 static inline void respond_ID(struct tty_struct * tty)
1382 {
1383 respond_string(VT102ID, tty);
1384 }
1385
1386 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1387 {
1388 char buf[8];
1389
1390 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1391 (char)('!' + mry));
1392 respond_string(buf, tty);
1393 }
1394
1395 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1396 int mouse_reporting(void)
1397 {
1398 return vc_cons[fg_console].d->vc_report_mouse;
1399 }
1400
1401 /* console_sem is held */
1402 static void set_mode(struct vc_data *vc, int on_off)
1403 {
1404 int i;
1405
1406 for (i = 0; i <= vc->vc_npar; i++)
1407 if (vc->vc_ques) {
1408 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1409 case 1: /* Cursor keys send ^[Ox/^[[x */
1410 if (on_off)
1411 set_kbd(vc, decckm);
1412 else
1413 clr_kbd(vc, decckm);
1414 break;
1415 case 3: /* 80/132 mode switch unimplemented */
1416 vc->vc_deccolm = on_off;
1417 #if 0
1418 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1419 /* this alone does not suffice; some user mode
1420 utility has to change the hardware regs */
1421 #endif
1422 break;
1423 case 5: /* Inverted screen on/off */
1424 if (vc->vc_decscnm != on_off) {
1425 vc->vc_decscnm = on_off;
1426 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1427 update_attr(vc);
1428 }
1429 break;
1430 case 6: /* Origin relative/absolute */
1431 vc->vc_decom = on_off;
1432 gotoxay(vc, 0, 0);
1433 break;
1434 case 7: /* Autowrap on/off */
1435 vc->vc_decawm = on_off;
1436 break;
1437 case 8: /* Autorepeat on/off */
1438 if (on_off)
1439 set_kbd(vc, decarm);
1440 else
1441 clr_kbd(vc, decarm);
1442 break;
1443 case 9:
1444 vc->vc_report_mouse = on_off ? 1 : 0;
1445 break;
1446 case 25: /* Cursor on/off */
1447 vc->vc_deccm = on_off;
1448 break;
1449 case 1000:
1450 vc->vc_report_mouse = on_off ? 2 : 0;
1451 break;
1452 }
1453 } else {
1454 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1455 case 3: /* Monitor (display ctrls) */
1456 vc->vc_disp_ctrl = on_off;
1457 break;
1458 case 4: /* Insert Mode on/off */
1459 vc->vc_decim = on_off;
1460 break;
1461 case 20: /* Lf, Enter == CrLf/Lf */
1462 if (on_off)
1463 set_kbd(vc, lnm);
1464 else
1465 clr_kbd(vc, lnm);
1466 break;
1467 }
1468 }
1469 }
1470
1471 /* console_sem is held */
1472 static void setterm_command(struct vc_data *vc)
1473 {
1474 switch(vc->vc_par[0]) {
1475 case 1: /* set color for underline mode */
1476 if (vc->vc_can_do_color &&
1477 vc->vc_par[1] < 16) {
1478 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1479 if (vc->vc_underline)
1480 update_attr(vc);
1481 }
1482 break;
1483 case 2: /* set color for half intensity mode */
1484 if (vc->vc_can_do_color &&
1485 vc->vc_par[1] < 16) {
1486 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1487 if (vc->vc_intensity == 0)
1488 update_attr(vc);
1489 }
1490 break;
1491 case 8: /* store colors as defaults */
1492 vc->vc_def_color = vc->vc_attr;
1493 if (vc->vc_hi_font_mask == 0x100)
1494 vc->vc_def_color >>= 1;
1495 default_attr(vc);
1496 update_attr(vc);
1497 break;
1498 case 9: /* set blanking interval */
1499 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1500 poke_blanked_console();
1501 break;
1502 case 10: /* set bell frequency in Hz */
1503 if (vc->vc_npar >= 1)
1504 vc->vc_bell_pitch = vc->vc_par[1];
1505 else
1506 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1507 break;
1508 case 11: /* set bell duration in msec */
1509 if (vc->vc_npar >= 1)
1510 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1511 vc->vc_par[1] * HZ / 1000 : 0;
1512 else
1513 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1514 break;
1515 case 12: /* bring specified console to the front */
1516 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1517 set_console(vc->vc_par[1] - 1);
1518 break;
1519 case 13: /* unblank the screen */
1520 poke_blanked_console();
1521 break;
1522 case 14: /* set vesa powerdown interval */
1523 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1524 break;
1525 case 15: /* activate the previous console */
1526 set_console(last_console);
1527 break;
1528 }
1529 }
1530
1531 /* console_sem is held */
1532 static void csi_at(struct vc_data *vc, unsigned int nr)
1533 {
1534 if (nr > vc->vc_cols - vc->vc_x)
1535 nr = vc->vc_cols - vc->vc_x;
1536 else if (!nr)
1537 nr = 1;
1538 insert_char(vc, nr);
1539 }
1540
1541 /* console_sem is held */
1542 static void csi_L(struct vc_data *vc, unsigned int nr)
1543 {
1544 if (nr > vc->vc_rows - vc->vc_y)
1545 nr = vc->vc_rows - vc->vc_y;
1546 else if (!nr)
1547 nr = 1;
1548 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1549 vc->vc_need_wrap = 0;
1550 }
1551
1552 /* console_sem is held */
1553 static void csi_P(struct vc_data *vc, unsigned int nr)
1554 {
1555 if (nr > vc->vc_cols - vc->vc_x)
1556 nr = vc->vc_cols - vc->vc_x;
1557 else if (!nr)
1558 nr = 1;
1559 delete_char(vc, nr);
1560 }
1561
1562 /* console_sem is held */
1563 static void csi_M(struct vc_data *vc, unsigned int nr)
1564 {
1565 if (nr > vc->vc_rows - vc->vc_y)
1566 nr = vc->vc_rows - vc->vc_y;
1567 else if (!nr)
1568 nr=1;
1569 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1570 vc->vc_need_wrap = 0;
1571 }
1572
1573 /* console_sem is held (except via vc_init->reset_terminal */
1574 static void save_cur(struct vc_data *vc)
1575 {
1576 vc->vc_saved_x = vc->vc_x;
1577 vc->vc_saved_y = vc->vc_y;
1578 vc->vc_s_intensity = vc->vc_intensity;
1579 vc->vc_s_italic = vc->vc_italic;
1580 vc->vc_s_underline = vc->vc_underline;
1581 vc->vc_s_blink = vc->vc_blink;
1582 vc->vc_s_reverse = vc->vc_reverse;
1583 vc->vc_s_charset = vc->vc_charset;
1584 vc->vc_s_color = vc->vc_color;
1585 vc->vc_saved_G0 = vc->vc_G0_charset;
1586 vc->vc_saved_G1 = vc->vc_G1_charset;
1587 }
1588
1589 /* console_sem is held */
1590 static void restore_cur(struct vc_data *vc)
1591 {
1592 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1593 vc->vc_intensity = vc->vc_s_intensity;
1594 vc->vc_italic = vc->vc_s_italic;
1595 vc->vc_underline = vc->vc_s_underline;
1596 vc->vc_blink = vc->vc_s_blink;
1597 vc->vc_reverse = vc->vc_s_reverse;
1598 vc->vc_charset = vc->vc_s_charset;
1599 vc->vc_color = vc->vc_s_color;
1600 vc->vc_G0_charset = vc->vc_saved_G0;
1601 vc->vc_G1_charset = vc->vc_saved_G1;
1602 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1603 update_attr(vc);
1604 vc->vc_need_wrap = 0;
1605 }
1606
1607 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1608 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1609 ESpalette };
1610
1611 /* console_sem is held (except via vc_init()) */
1612 static void reset_terminal(struct vc_data *vc, int do_clear)
1613 {
1614 vc->vc_top = 0;
1615 vc->vc_bottom = vc->vc_rows;
1616 vc->vc_state = ESnormal;
1617 vc->vc_ques = 0;
1618 vc->vc_translate = set_translate(LAT1_MAP, vc);
1619 vc->vc_G0_charset = LAT1_MAP;
1620 vc->vc_G1_charset = GRAF_MAP;
1621 vc->vc_charset = 0;
1622 vc->vc_need_wrap = 0;
1623 vc->vc_report_mouse = 0;
1624 vc->vc_utf = default_utf8;
1625 vc->vc_utf_count = 0;
1626
1627 vc->vc_disp_ctrl = 0;
1628 vc->vc_toggle_meta = 0;
1629
1630 vc->vc_decscnm = 0;
1631 vc->vc_decom = 0;
1632 vc->vc_decawm = 1;
1633 vc->vc_deccm = global_cursor_default;
1634 vc->vc_decim = 0;
1635
1636 set_kbd(vc, decarm);
1637 clr_kbd(vc, decckm);
1638 clr_kbd(vc, kbdapplic);
1639 clr_kbd(vc, lnm);
1640 kbd_table[vc->vc_num].lockstate = 0;
1641 kbd_table[vc->vc_num].slockstate = 0;
1642 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1643 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1644 /* do not do set_leds here because this causes an endless tasklet loop
1645 when the keyboard hasn't been initialized yet */
1646
1647 vc->vc_cursor_type = cur_default;
1648 vc->vc_complement_mask = vc->vc_s_complement_mask;
1649
1650 default_attr(vc);
1651 update_attr(vc);
1652
1653 vc->vc_tab_stop[0] = 0x01010100;
1654 vc->vc_tab_stop[1] =
1655 vc->vc_tab_stop[2] =
1656 vc->vc_tab_stop[3] =
1657 vc->vc_tab_stop[4] =
1658 vc->vc_tab_stop[5] =
1659 vc->vc_tab_stop[6] =
1660 vc->vc_tab_stop[7] = 0x01010101;
1661
1662 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1663 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1664
1665 gotoxy(vc, 0, 0);
1666 save_cur(vc);
1667 if (do_clear)
1668 csi_J(vc, 2);
1669 }
1670
1671 /* console_sem is held */
1672 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1673 {
1674 /*
1675 * Control characters can be used in the _middle_
1676 * of an escape sequence.
1677 */
1678 switch (c) {
1679 case 0:
1680 return;
1681 case 7:
1682 if (vc->vc_bell_duration)
1683 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1684 return;
1685 case 8:
1686 bs(vc);
1687 return;
1688 case 9:
1689 vc->vc_pos -= (vc->vc_x << 1);
1690 while (vc->vc_x < vc->vc_cols - 1) {
1691 vc->vc_x++;
1692 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1693 break;
1694 }
1695 vc->vc_pos += (vc->vc_x << 1);
1696 notify_write(vc, '\t');
1697 return;
1698 case 10: case 11: case 12:
1699 lf(vc);
1700 if (!is_kbd(vc, lnm))
1701 return;
1702 case 13:
1703 cr(vc);
1704 return;
1705 case 14:
1706 vc->vc_charset = 1;
1707 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1708 vc->vc_disp_ctrl = 1;
1709 return;
1710 case 15:
1711 vc->vc_charset = 0;
1712 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1713 vc->vc_disp_ctrl = 0;
1714 return;
1715 case 24: case 26:
1716 vc->vc_state = ESnormal;
1717 return;
1718 case 27:
1719 vc->vc_state = ESesc;
1720 return;
1721 case 127:
1722 del(vc);
1723 return;
1724 case 128+27:
1725 vc->vc_state = ESsquare;
1726 return;
1727 }
1728 switch(vc->vc_state) {
1729 case ESesc:
1730 vc->vc_state = ESnormal;
1731 switch (c) {
1732 case '[':
1733 vc->vc_state = ESsquare;
1734 return;
1735 case ']':
1736 vc->vc_state = ESnonstd;
1737 return;
1738 case '%':
1739 vc->vc_state = ESpercent;
1740 return;
1741 case 'E':
1742 cr(vc);
1743 lf(vc);
1744 return;
1745 case 'M':
1746 ri(vc);
1747 return;
1748 case 'D':
1749 lf(vc);
1750 return;
1751 case 'H':
1752 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1753 return;
1754 case 'Z':
1755 respond_ID(tty);
1756 return;
1757 case '7':
1758 save_cur(vc);
1759 return;
1760 case '8':
1761 restore_cur(vc);
1762 return;
1763 case '(':
1764 vc->vc_state = ESsetG0;
1765 return;
1766 case ')':
1767 vc->vc_state = ESsetG1;
1768 return;
1769 case '#':
1770 vc->vc_state = EShash;
1771 return;
1772 case 'c':
1773 reset_terminal(vc, 1);
1774 return;
1775 case '>': /* Numeric keypad */
1776 clr_kbd(vc, kbdapplic);
1777 return;
1778 case '=': /* Appl. keypad */
1779 set_kbd(vc, kbdapplic);
1780 return;
1781 }
1782 return;
1783 case ESnonstd:
1784 if (c=='P') { /* palette escape sequence */
1785 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1786 vc->vc_par[vc->vc_npar] = 0;
1787 vc->vc_npar = 0;
1788 vc->vc_state = ESpalette;
1789 return;
1790 } else if (c=='R') { /* reset palette */
1791 reset_palette(vc);
1792 vc->vc_state = ESnormal;
1793 } else
1794 vc->vc_state = ESnormal;
1795 return;
1796 case ESpalette:
1797 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1798 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1799 if (vc->vc_npar == 7) {
1800 int i = vc->vc_par[0] * 3, j = 1;
1801 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1802 vc->vc_palette[i++] += vc->vc_par[j++];
1803 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1804 vc->vc_palette[i++] += vc->vc_par[j++];
1805 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1806 vc->vc_palette[i] += vc->vc_par[j];
1807 set_palette(vc);
1808 vc->vc_state = ESnormal;
1809 }
1810 } else
1811 vc->vc_state = ESnormal;
1812 return;
1813 case ESsquare:
1814 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1815 vc->vc_par[vc->vc_npar] = 0;
1816 vc->vc_npar = 0;
1817 vc->vc_state = ESgetpars;
1818 if (c == '[') { /* Function key */
1819 vc->vc_state=ESfunckey;
1820 return;
1821 }
1822 vc->vc_ques = (c == '?');
1823 if (vc->vc_ques)
1824 return;
1825 case ESgetpars:
1826 if (c == ';' && vc->vc_npar < NPAR - 1) {
1827 vc->vc_npar++;
1828 return;
1829 } else if (c>='0' && c<='9') {
1830 vc->vc_par[vc->vc_npar] *= 10;
1831 vc->vc_par[vc->vc_npar] += c - '0';
1832 return;
1833 } else
1834 vc->vc_state = ESgotpars;
1835 case ESgotpars:
1836 vc->vc_state = ESnormal;
1837 switch(c) {
1838 case 'h':
1839 set_mode(vc, 1);
1840 return;
1841 case 'l':
1842 set_mode(vc, 0);
1843 return;
1844 case 'c':
1845 if (vc->vc_ques) {
1846 if (vc->vc_par[0])
1847 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1848 else
1849 vc->vc_cursor_type = cur_default;
1850 return;
1851 }
1852 break;
1853 case 'm':
1854 if (vc->vc_ques) {
1855 clear_selection();
1856 if (vc->vc_par[0])
1857 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1858 else
1859 vc->vc_complement_mask = vc->vc_s_complement_mask;
1860 return;
1861 }
1862 break;
1863 case 'n':
1864 if (!vc->vc_ques) {
1865 if (vc->vc_par[0] == 5)
1866 status_report(tty);
1867 else if (vc->vc_par[0] == 6)
1868 cursor_report(vc, tty);
1869 }
1870 return;
1871 }
1872 if (vc->vc_ques) {
1873 vc->vc_ques = 0;
1874 return;
1875 }
1876 switch(c) {
1877 case 'G': case '`':
1878 if (vc->vc_par[0])
1879 vc->vc_par[0]--;
1880 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1881 return;
1882 case 'A':
1883 if (!vc->vc_par[0])
1884 vc->vc_par[0]++;
1885 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1886 return;
1887 case 'B': case 'e':
1888 if (!vc->vc_par[0])
1889 vc->vc_par[0]++;
1890 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1891 return;
1892 case 'C': case 'a':
1893 if (!vc->vc_par[0])
1894 vc->vc_par[0]++;
1895 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1896 return;
1897 case 'D':
1898 if (!vc->vc_par[0])
1899 vc->vc_par[0]++;
1900 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1901 return;
1902 case 'E':
1903 if (!vc->vc_par[0])
1904 vc->vc_par[0]++;
1905 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1906 return;
1907 case 'F':
1908 if (!vc->vc_par[0])
1909 vc->vc_par[0]++;
1910 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1911 return;
1912 case 'd':
1913 if (vc->vc_par[0])
1914 vc->vc_par[0]--;
1915 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1916 return;
1917 case 'H': case 'f':
1918 if (vc->vc_par[0])
1919 vc->vc_par[0]--;
1920 if (vc->vc_par[1])
1921 vc->vc_par[1]--;
1922 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1923 return;
1924 case 'J':
1925 csi_J(vc, vc->vc_par[0]);
1926 return;
1927 case 'K':
1928 csi_K(vc, vc->vc_par[0]);
1929 return;
1930 case 'L':
1931 csi_L(vc, vc->vc_par[0]);
1932 return;
1933 case 'M':
1934 csi_M(vc, vc->vc_par[0]);
1935 return;
1936 case 'P':
1937 csi_P(vc, vc->vc_par[0]);
1938 return;
1939 case 'c':
1940 if (!vc->vc_par[0])
1941 respond_ID(tty);
1942 return;
1943 case 'g':
1944 if (!vc->vc_par[0])
1945 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1946 else if (vc->vc_par[0] == 3) {
1947 vc->vc_tab_stop[0] =
1948 vc->vc_tab_stop[1] =
1949 vc->vc_tab_stop[2] =
1950 vc->vc_tab_stop[3] =
1951 vc->vc_tab_stop[4] =
1952 vc->vc_tab_stop[5] =
1953 vc->vc_tab_stop[6] =
1954 vc->vc_tab_stop[7] = 0;
1955 }
1956 return;
1957 case 'm':
1958 csi_m(vc);
1959 return;
1960 case 'q': /* DECLL - but only 3 leds */
1961 /* map 0,1,2,3 to 0,1,2,4 */
1962 if (vc->vc_par[0] < 4)
1963 setledstate(kbd_table + vc->vc_num,
1964 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1965 return;
1966 case 'r':
1967 if (!vc->vc_par[0])
1968 vc->vc_par[0]++;
1969 if (!vc->vc_par[1])
1970 vc->vc_par[1] = vc->vc_rows;
1971 /* Minimum allowed region is 2 lines */
1972 if (vc->vc_par[0] < vc->vc_par[1] &&
1973 vc->vc_par[1] <= vc->vc_rows) {
1974 vc->vc_top = vc->vc_par[0] - 1;
1975 vc->vc_bottom = vc->vc_par[1];
1976 gotoxay(vc, 0, 0);
1977 }
1978 return;
1979 case 's':
1980 save_cur(vc);
1981 return;
1982 case 'u':
1983 restore_cur(vc);
1984 return;
1985 case 'X':
1986 csi_X(vc, vc->vc_par[0]);
1987 return;
1988 case '@':
1989 csi_at(vc, vc->vc_par[0]);
1990 return;
1991 case ']': /* setterm functions */
1992 setterm_command(vc);
1993 return;
1994 }
1995 return;
1996 case ESpercent:
1997 vc->vc_state = ESnormal;
1998 switch (c) {
1999 case '@': /* defined in ISO 2022 */
2000 vc->vc_utf = 0;
2001 return;
2002 case 'G': /* prelim official escape code */
2003 case '8': /* retained for compatibility */
2004 vc->vc_utf = 1;
2005 return;
2006 }
2007 return;
2008 case ESfunckey:
2009 vc->vc_state = ESnormal;
2010 return;
2011 case EShash:
2012 vc->vc_state = ESnormal;
2013 if (c == '8') {
2014 /* DEC screen alignment test. kludge :-) */
2015 vc->vc_video_erase_char =
2016 (vc->vc_video_erase_char & 0xff00) | 'E';
2017 csi_J(vc, 2);
2018 vc->vc_video_erase_char =
2019 (vc->vc_video_erase_char & 0xff00) | ' ';
2020 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2021 }
2022 return;
2023 case ESsetG0:
2024 if (c == '0')
2025 vc->vc_G0_charset = GRAF_MAP;
2026 else if (c == 'B')
2027 vc->vc_G0_charset = LAT1_MAP;
2028 else if (c == 'U')
2029 vc->vc_G0_charset = IBMPC_MAP;
2030 else if (c == 'K')
2031 vc->vc_G0_charset = USER_MAP;
2032 if (vc->vc_charset == 0)
2033 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2034 vc->vc_state = ESnormal;
2035 return;
2036 case ESsetG1:
2037 if (c == '0')
2038 vc->vc_G1_charset = GRAF_MAP;
2039 else if (c == 'B')
2040 vc->vc_G1_charset = LAT1_MAP;
2041 else if (c == 'U')
2042 vc->vc_G1_charset = IBMPC_MAP;
2043 else if (c == 'K')
2044 vc->vc_G1_charset = USER_MAP;
2045 if (vc->vc_charset == 1)
2046 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2047 vc->vc_state = ESnormal;
2048 return;
2049 default:
2050 vc->vc_state = ESnormal;
2051 }
2052 }
2053
2054 /* This is a temporary buffer used to prepare a tty console write
2055 * so that we can easily avoid touching user space while holding the
2056 * console spinlock. It is allocated in con_init and is shared by
2057 * this code and the vc_screen read/write tty calls.
2058 *
2059 * We have to allocate this statically in the kernel data section
2060 * since console_init (and thus con_init) are called before any
2061 * kernel memory allocation is available.
2062 */
2063 char con_buf[CON_BUF_SIZE];
2064 DEFINE_MUTEX(con_buf_mtx);
2065
2066 /* is_double_width() is based on the wcwidth() implementation by
2067 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2068 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2069 */
2070 struct interval {
2071 uint32_t first;
2072 uint32_t last;
2073 };
2074
2075 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2076 {
2077 int min = 0;
2078 int mid;
2079
2080 if (ucs < table[0].first || ucs > table[max].last)
2081 return 0;
2082 while (max >= min) {
2083 mid = (min + max) / 2;
2084 if (ucs > table[mid].last)
2085 min = mid + 1;
2086 else if (ucs < table[mid].first)
2087 max = mid - 1;
2088 else
2089 return 1;
2090 }
2091 return 0;
2092 }
2093
2094 static int is_double_width(uint32_t ucs)
2095 {
2096 static const struct interval double_width[] = {
2097 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2098 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2099 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2100 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2101 };
2102 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2103 }
2104
2105 /* acquires console_sem */
2106 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2107 {
2108 #ifdef VT_BUF_VRAM_ONLY
2109 #define FLUSH do { } while(0);
2110 #else
2111 #define FLUSH if (draw_x >= 0) { \
2112 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2113 draw_x = -1; \
2114 }
2115 #endif
2116
2117 int c, tc, ok, n = 0, draw_x = -1;
2118 unsigned int currcons;
2119 unsigned long draw_from = 0, draw_to = 0;
2120 struct vc_data *vc;
2121 unsigned char vc_attr;
2122 struct vt_notifier_param param;
2123 uint8_t rescan;
2124 uint8_t inverse;
2125 uint8_t width;
2126 u16 himask, charmask;
2127
2128 if (in_interrupt())
2129 return count;
2130
2131 might_sleep();
2132
2133 acquire_console_sem();
2134 vc = tty->driver_data;
2135 if (vc == NULL) {
2136 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2137 release_console_sem();
2138 return 0;
2139 }
2140
2141 currcons = vc->vc_num;
2142 if (!vc_cons_allocated(currcons)) {
2143 /* could this happen? */
2144 printk_once("con_write: tty %d not allocated\n", currcons+1);
2145 release_console_sem();
2146 return 0;
2147 }
2148
2149 himask = vc->vc_hi_font_mask;
2150 charmask = himask ? 0x1ff : 0xff;
2151
2152 /* undraw cursor first */
2153 if (IS_FG(vc))
2154 hide_cursor(vc);
2155
2156 param.vc = vc;
2157
2158 while (!tty->stopped && count) {
2159 int orig = *buf;
2160 c = orig;
2161 buf++;
2162 n++;
2163 count--;
2164 rescan = 0;
2165 inverse = 0;
2166 width = 1;
2167
2168 /* Do no translation at all in control states */
2169 if (vc->vc_state != ESnormal) {
2170 tc = c;
2171 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2172 /* Combine UTF-8 into Unicode in vc_utf_char.
2173 * vc_utf_count is the number of continuation bytes still
2174 * expected to arrive.
2175 * vc_npar is the number of continuation bytes arrived so
2176 * far
2177 */
2178 rescan_last_byte:
2179 if ((c & 0xc0) == 0x80) {
2180 /* Continuation byte received */
2181 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2182 if (vc->vc_utf_count) {
2183 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2184 vc->vc_npar++;
2185 if (--vc->vc_utf_count) {
2186 /* Still need some bytes */
2187 continue;
2188 }
2189 /* Got a whole character */
2190 c = vc->vc_utf_char;
2191 /* Reject overlong sequences */
2192 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2193 c > utf8_length_changes[vc->vc_npar])
2194 c = 0xfffd;
2195 } else {
2196 /* Unexpected continuation byte */
2197 vc->vc_utf_count = 0;
2198 c = 0xfffd;
2199 }
2200 } else {
2201 /* Single ASCII byte or first byte of a sequence received */
2202 if (vc->vc_utf_count) {
2203 /* Continuation byte expected */
2204 rescan = 1;
2205 vc->vc_utf_count = 0;
2206 c = 0xfffd;
2207 } else if (c > 0x7f) {
2208 /* First byte of a multibyte sequence received */
2209 vc->vc_npar = 0;
2210 if ((c & 0xe0) == 0xc0) {
2211 vc->vc_utf_count = 1;
2212 vc->vc_utf_char = (c & 0x1f);
2213 } else if ((c & 0xf0) == 0xe0) {
2214 vc->vc_utf_count = 2;
2215 vc->vc_utf_char = (c & 0x0f);
2216 } else if ((c & 0xf8) == 0xf0) {
2217 vc->vc_utf_count = 3;
2218 vc->vc_utf_char = (c & 0x07);
2219 } else if ((c & 0xfc) == 0xf8) {
2220 vc->vc_utf_count = 4;
2221 vc->vc_utf_char = (c & 0x03);
2222 } else if ((c & 0xfe) == 0xfc) {
2223 vc->vc_utf_count = 5;
2224 vc->vc_utf_char = (c & 0x01);
2225 } else {
2226 /* 254 and 255 are invalid */
2227 c = 0xfffd;
2228 }
2229 if (vc->vc_utf_count) {
2230 /* Still need some bytes */
2231 continue;
2232 }
2233 }
2234 /* Nothing to do if an ASCII byte was received */
2235 }
2236 /* End of UTF-8 decoding. */
2237 /* c is the received character, or U+FFFD for invalid sequences. */
2238 /* Replace invalid Unicode code points with U+FFFD too */
2239 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2240 c = 0xfffd;
2241 tc = c;
2242 } else { /* no utf or alternate charset mode */
2243 tc = vc_translate(vc, c);
2244 }
2245
2246 param.c = tc;
2247 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2248 &param) == NOTIFY_STOP)
2249 continue;
2250
2251 /* If the original code was a control character we
2252 * only allow a glyph to be displayed if the code is
2253 * not normally used (such as for cursor movement) or
2254 * if the disp_ctrl mode has been explicitly enabled.
2255 * Certain characters (as given by the CTRL_ALWAYS
2256 * bitmap) are always displayed as control characters,
2257 * as the console would be pretty useless without
2258 * them; to display an arbitrary font position use the
2259 * direct-to-font zone in UTF-8 mode.
2260 */
2261 ok = tc && (c >= 32 ||
2262 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2263 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2264 && (c != 127 || vc->vc_disp_ctrl)
2265 && (c != 128+27);
2266
2267 if (vc->vc_state == ESnormal && ok) {
2268 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2269 if (is_double_width(c))
2270 width = 2;
2271 }
2272 /* Now try to find out how to display it */
2273 tc = conv_uni_to_pc(vc, tc);
2274 if (tc & ~charmask) {
2275 if (tc == -1 || tc == -2) {
2276 continue; /* nothing to display */
2277 }
2278 /* Glyph not found */
2279 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2280 /* In legacy mode use the glyph we get by a 1:1 mapping.
2281 This would make absolutely no sense with Unicode in mind,
2282 but do this for ASCII characters since a font may lack
2283 Unicode mapping info and we don't want to end up with
2284 having question marks only. */
2285 tc = c;
2286 } else {
2287 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2288 tc = conv_uni_to_pc(vc, 0xfffd);
2289 if (tc < 0) {
2290 inverse = 1;
2291 tc = conv_uni_to_pc(vc, '?');
2292 if (tc < 0) tc = '?';
2293 }
2294 }
2295 }
2296
2297 if (!inverse) {
2298 vc_attr = vc->vc_attr;
2299 } else {
2300 /* invert vc_attr */
2301 if (!vc->vc_can_do_color) {
2302 vc_attr = (vc->vc_attr) ^ 0x08;
2303 } else if (vc->vc_hi_font_mask == 0x100) {
2304 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2305 } else {
2306 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2307 }
2308 FLUSH
2309 }
2310
2311 while (1) {
2312 if (vc->vc_need_wrap || vc->vc_decim)
2313 FLUSH
2314 if (vc->vc_need_wrap) {
2315 cr(vc);
2316 lf(vc);
2317 }
2318 if (vc->vc_decim)
2319 insert_char(vc, 1);
2320 scr_writew(himask ?
2321 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2322 (vc_attr << 8) + tc,
2323 (u16 *) vc->vc_pos);
2324 if (DO_UPDATE(vc) && draw_x < 0) {
2325 draw_x = vc->vc_x;
2326 draw_from = vc->vc_pos;
2327 }
2328 if (vc->vc_x == vc->vc_cols - 1) {
2329 vc->vc_need_wrap = vc->vc_decawm;
2330 draw_to = vc->vc_pos + 2;
2331 } else {
2332 vc->vc_x++;
2333 draw_to = (vc->vc_pos += 2);
2334 }
2335
2336 if (!--width) break;
2337
2338 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2339 if (tc < 0) tc = ' ';
2340 }
2341 notify_write(vc, c);
2342
2343 if (inverse) {
2344 FLUSH
2345 }
2346
2347 if (rescan) {
2348 rescan = 0;
2349 inverse = 0;
2350 width = 1;
2351 c = orig;
2352 goto rescan_last_byte;
2353 }
2354 continue;
2355 }
2356 FLUSH
2357 do_con_trol(tty, vc, orig);
2358 }
2359 FLUSH
2360 console_conditional_schedule();
2361 release_console_sem();
2362 notify_update(vc);
2363 return n;
2364 #undef FLUSH
2365 }
2366
2367 /*
2368 * This is the console switching callback.
2369 *
2370 * Doing console switching in a process context allows
2371 * us to do the switches asynchronously (needed when we want
2372 * to switch due to a keyboard interrupt). Synchronization
2373 * with other console code and prevention of re-entrancy is
2374 * ensured with console_sem.
2375 */
2376 static void console_callback(struct work_struct *ignored)
2377 {
2378 acquire_console_sem();
2379
2380 if (want_console >= 0) {
2381 if (want_console != fg_console &&
2382 vc_cons_allocated(want_console)) {
2383 hide_cursor(vc_cons[fg_console].d);
2384 change_console(vc_cons[want_console].d);
2385 /* we only changed when the console had already
2386 been allocated - a new console is not created
2387 in an interrupt routine */
2388 }
2389 want_console = -1;
2390 }
2391 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2392 do_poke_blanked_console = 0;
2393 poke_blanked_console();
2394 }
2395 if (scrollback_delta) {
2396 struct vc_data *vc = vc_cons[fg_console].d;
2397 clear_selection();
2398 if (vc->vc_mode == KD_TEXT)
2399 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2400 scrollback_delta = 0;
2401 }
2402 if (blank_timer_expired) {
2403 do_blank_screen(0);
2404 blank_timer_expired = 0;
2405 }
2406 notify_update(vc_cons[fg_console].d);
2407
2408 release_console_sem();
2409 }
2410
2411 int set_console(int nr)
2412 {
2413 struct vc_data *vc = vc_cons[fg_console].d;
2414
2415 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2416 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2417
2418 /*
2419 * Console switch will fail in console_callback() or
2420 * change_console() so there is no point scheduling
2421 * the callback
2422 *
2423 * Existing set_console() users don't check the return
2424 * value so this shouldn't break anything
2425 */
2426 return -EINVAL;
2427 }
2428
2429 want_console = nr;
2430 schedule_console_callback();
2431
2432 return 0;
2433 }
2434
2435 struct tty_driver *console_driver;
2436
2437 #ifdef CONFIG_VT_CONSOLE
2438
2439 /**
2440 * vt_kmsg_redirect() - Sets/gets the kernel message console
2441 * @new: The new virtual terminal number or -1 if the console should stay
2442 * unchanged
2443 *
2444 * By default, the kernel messages are always printed on the current virtual
2445 * console. However, the user may modify that default with the
2446 * TIOCL_SETKMSGREDIRECT ioctl call.
2447 *
2448 * This function sets the kernel message console to be @new. It returns the old
2449 * virtual console number. The virtual terminal number 0 (both as parameter and
2450 * return value) means no redirection (i.e. always printed on the currently
2451 * active console).
2452 *
2453 * The parameter -1 means that only the current console is returned, but the
2454 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2455 * case to make the code more understandable.
2456 *
2457 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2458 * the parameter and always returns 0.
2459 */
2460 int vt_kmsg_redirect(int new)
2461 {
2462 static int kmsg_con;
2463
2464 if (new != -1)
2465 return xchg(&kmsg_con, new);
2466 else
2467 return kmsg_con;
2468 }
2469
2470 /*
2471 * Console on virtual terminal
2472 *
2473 * The console must be locked when we get here.
2474 */
2475
2476 static void vt_console_print(struct console *co, const char *b, unsigned count)
2477 {
2478 struct vc_data *vc = vc_cons[fg_console].d;
2479 unsigned char c;
2480 static DEFINE_SPINLOCK(printing_lock);
2481 const ushort *start;
2482 ushort cnt = 0;
2483 ushort myx;
2484 int kmsg_console;
2485
2486 /* console busy or not yet initialized */
2487 if (!printable)
2488 return;
2489 if (!spin_trylock(&printing_lock))
2490 return;
2491
2492 kmsg_console = vt_get_kmsg_redirect();
2493 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2494 vc = vc_cons[kmsg_console - 1].d;
2495
2496 /* read `x' only after setting currcons properly (otherwise
2497 the `x' macro will read the x of the foreground console). */
2498 myx = vc->vc_x;
2499
2500 if (!vc_cons_allocated(fg_console)) {
2501 /* impossible */
2502 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2503 goto quit;
2504 }
2505
2506 if (vc->vc_mode != KD_TEXT)
2507 goto quit;
2508
2509 /* undraw cursor first */
2510 if (IS_FG(vc))
2511 hide_cursor(vc);
2512
2513 start = (ushort *)vc->vc_pos;
2514
2515 /* Contrived structure to try to emulate original need_wrap behaviour
2516 * Problems caused when we have need_wrap set on '\n' character */
2517 while (count--) {
2518 c = *b++;
2519 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2520 if (cnt > 0) {
2521 if (CON_IS_VISIBLE(vc))
2522 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2523 vc->vc_x += cnt;
2524 if (vc->vc_need_wrap)
2525 vc->vc_x--;
2526 cnt = 0;
2527 }
2528 if (c == 8) { /* backspace */
2529 bs(vc);
2530 start = (ushort *)vc->vc_pos;
2531 myx = vc->vc_x;
2532 continue;
2533 }
2534 if (c != 13)
2535 lf(vc);
2536 cr(vc);
2537 start = (ushort *)vc->vc_pos;
2538 myx = vc->vc_x;
2539 if (c == 10 || c == 13)
2540 continue;
2541 }
2542 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2543 notify_write(vc, c);
2544 cnt++;
2545 if (myx == vc->vc_cols - 1) {
2546 vc->vc_need_wrap = 1;
2547 continue;
2548 }
2549 vc->vc_pos += 2;
2550 myx++;
2551 }
2552 if (cnt > 0) {
2553 if (CON_IS_VISIBLE(vc))
2554 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2555 vc->vc_x += cnt;
2556 if (vc->vc_x == vc->vc_cols) {
2557 vc->vc_x--;
2558 vc->vc_need_wrap = 1;
2559 }
2560 }
2561 set_cursor(vc);
2562 notify_update(vc);
2563
2564 quit:
2565 spin_unlock(&printing_lock);
2566 }
2567
2568 static struct tty_driver *vt_console_device(struct console *c, int *index)
2569 {
2570 *index = c->index ? c->index-1 : fg_console;
2571 return console_driver;
2572 }
2573
2574 static struct console vt_console_driver = {
2575 .name = "tty",
2576 .write = vt_console_print,
2577 .device = vt_console_device,
2578 .unblank = unblank_screen,
2579 .flags = CON_PRINTBUFFER,
2580 .index = -1,
2581 };
2582 #endif
2583
2584 /*
2585 * Handling of Linux-specific VC ioctls
2586 */
2587
2588 /*
2589 * Generally a bit racy with respect to console_sem().
2590 *
2591 * There are some functions which don't need it.
2592 *
2593 * There are some functions which can sleep for arbitrary periods
2594 * (paste_selection) but we don't need the lock there anyway.
2595 *
2596 * set_selection has locking, and definitely needs it
2597 */
2598
2599 int tioclinux(struct tty_struct *tty, unsigned long arg)
2600 {
2601 char type, data;
2602 char __user *p = (char __user *)arg;
2603 int lines;
2604 int ret;
2605
2606 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2607 return -EPERM;
2608 if (get_user(type, p))
2609 return -EFAULT;
2610 ret = 0;
2611
2612 lock_kernel();
2613
2614 switch (type)
2615 {
2616 case TIOCL_SETSEL:
2617 acquire_console_sem();
2618 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2619 release_console_sem();
2620 break;
2621 case TIOCL_PASTESEL:
2622 ret = paste_selection(tty);
2623 break;
2624 case TIOCL_UNBLANKSCREEN:
2625 acquire_console_sem();
2626 unblank_screen();
2627 release_console_sem();
2628 break;
2629 case TIOCL_SELLOADLUT:
2630 ret = sel_loadlut(p);
2631 break;
2632 case TIOCL_GETSHIFTSTATE:
2633
2634 /*
2635 * Make it possible to react to Shift+Mousebutton.
2636 * Note that 'shift_state' is an undocumented
2637 * kernel-internal variable; programs not closely
2638 * related to the kernel should not use this.
2639 */
2640 data = shift_state;
2641 ret = __put_user(data, p);
2642 break;
2643 case TIOCL_GETMOUSEREPORTING:
2644 data = mouse_reporting();
2645 ret = __put_user(data, p);
2646 break;
2647 case TIOCL_SETVESABLANK:
2648 ret = set_vesa_blanking(p);
2649 break;
2650 case TIOCL_GETKMSGREDIRECT:
2651 data = vt_get_kmsg_redirect();
2652 ret = __put_user(data, p);
2653 break;
2654 case TIOCL_SETKMSGREDIRECT:
2655 if (!capable(CAP_SYS_ADMIN)) {
2656 ret = -EPERM;
2657 } else {
2658 if (get_user(data, p+1))
2659 ret = -EFAULT;
2660 else
2661 vt_kmsg_redirect(data);
2662 }
2663 break;
2664 case TIOCL_GETFGCONSOLE:
2665 ret = fg_console;
2666 break;
2667 case TIOCL_SCROLLCONSOLE:
2668 if (get_user(lines, (s32 __user *)(p+4))) {
2669 ret = -EFAULT;
2670 } else {
2671 scrollfront(vc_cons[fg_console].d, lines);
2672 ret = 0;
2673 }
2674 break;
2675 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2676 acquire_console_sem();
2677 ignore_poke = 1;
2678 do_blank_screen(0);
2679 release_console_sem();
2680 break;
2681 case TIOCL_BLANKEDSCREEN:
2682 ret = console_blanked;
2683 break;
2684 default:
2685 ret = -EINVAL;
2686 break;
2687 }
2688 unlock_kernel();
2689 return ret;
2690 }
2691
2692 /*
2693 * /dev/ttyN handling
2694 */
2695
2696 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2697 {
2698 int retval;
2699
2700 retval = do_con_write(tty, buf, count);
2701 con_flush_chars(tty);
2702
2703 return retval;
2704 }
2705
2706 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2707 {
2708 if (in_interrupt())
2709 return 0; /* n_r3964 calls put_char() from interrupt context */
2710 return do_con_write(tty, &ch, 1);
2711 }
2712
2713 static int con_write_room(struct tty_struct *tty)
2714 {
2715 if (tty->stopped)
2716 return 0;
2717 return 32768; /* No limit, really; we're not buffering */
2718 }
2719
2720 static int con_chars_in_buffer(struct tty_struct *tty)
2721 {
2722 return 0; /* we're not buffering */
2723 }
2724
2725 /*
2726 * con_throttle and con_unthrottle are only used for
2727 * paste_selection(), which has to stuff in a large number of
2728 * characters...
2729 */
2730 static void con_throttle(struct tty_struct *tty)
2731 {
2732 }
2733
2734 static void con_unthrottle(struct tty_struct *tty)
2735 {
2736 struct vc_data *vc = tty->driver_data;
2737
2738 wake_up_interruptible(&vc->paste_wait);
2739 }
2740
2741 /*
2742 * Turn the Scroll-Lock LED on when the tty is stopped
2743 */
2744 static void con_stop(struct tty_struct *tty)
2745 {
2746 int console_num;
2747 if (!tty)
2748 return;
2749 console_num = tty->index;
2750 if (!vc_cons_allocated(console_num))
2751 return;
2752 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2753 set_leds();
2754 }
2755
2756 /*
2757 * Turn the Scroll-Lock LED off when the console is started
2758 */
2759 static void con_start(struct tty_struct *tty)
2760 {
2761 int console_num;
2762 if (!tty)
2763 return;
2764 console_num = tty->index;
2765 if (!vc_cons_allocated(console_num))
2766 return;
2767 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2768 set_leds();
2769 }
2770
2771 static void con_flush_chars(struct tty_struct *tty)
2772 {
2773 struct vc_data *vc;
2774
2775 if (in_interrupt()) /* from flush_to_ldisc */
2776 return;
2777
2778 /* if we race with con_close(), vt may be null */
2779 acquire_console_sem();
2780 vc = tty->driver_data;
2781 if (vc)
2782 set_cursor(vc);
2783 release_console_sem();
2784 }
2785
2786 /*
2787 * Allocate the console screen memory.
2788 */
2789 static int con_open(struct tty_struct *tty, struct file *filp)
2790 {
2791 unsigned int currcons = tty->index;
2792 int ret = 0;
2793
2794 acquire_console_sem();
2795 if (tty->driver_data == NULL) {
2796 ret = vc_allocate(currcons);
2797 if (ret == 0) {
2798 struct vc_data *vc = vc_cons[currcons].d;
2799
2800 /* Still being freed */
2801 if (vc->vc_tty) {
2802 release_console_sem();
2803 return -ERESTARTSYS;
2804 }
2805 tty->driver_data = vc;
2806 vc->vc_tty = tty;
2807
2808 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2809 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2810 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2811 }
2812 if (vc->vc_utf)
2813 tty->termios->c_iflag |= IUTF8;
2814 else
2815 tty->termios->c_iflag &= ~IUTF8;
2816 release_console_sem();
2817 return ret;
2818 }
2819 }
2820 release_console_sem();
2821 return ret;
2822 }
2823
2824 static void con_close(struct tty_struct *tty, struct file *filp)
2825 {
2826 /* Nothing to do - we defer to shutdown */
2827 }
2828
2829 static void con_shutdown(struct tty_struct *tty)
2830 {
2831 struct vc_data *vc = tty->driver_data;
2832 BUG_ON(vc == NULL);
2833 acquire_console_sem();
2834 vc->vc_tty = NULL;
2835 release_console_sem();
2836 tty_shutdown(tty);
2837 }
2838
2839 static int default_italic_color = 2; // green (ASCII)
2840 static int default_underline_color = 3; // cyan (ASCII)
2841 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2842 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2843
2844 static void vc_init(struct vc_data *vc, unsigned int rows,
2845 unsigned int cols, int do_clear)
2846 {
2847 int j, k ;
2848
2849 vc->vc_cols = cols;
2850 vc->vc_rows = rows;
2851 vc->vc_size_row = cols << 1;
2852 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2853
2854 set_origin(vc);
2855 vc->vc_pos = vc->vc_origin;
2856 reset_vc(vc);
2857 for (j=k=0; j<16; j++) {
2858 vc->vc_palette[k++] = default_red[j] ;
2859 vc->vc_palette[k++] = default_grn[j] ;
2860 vc->vc_palette[k++] = default_blu[j] ;
2861 }
2862 vc->vc_def_color = 0x07; /* white */
2863 vc->vc_ulcolor = default_underline_color;
2864 vc->vc_itcolor = default_italic_color;
2865 vc->vc_halfcolor = 0x08; /* grey */
2866 init_waitqueue_head(&vc->paste_wait);
2867 reset_terminal(vc, do_clear);
2868 }
2869
2870 /*
2871 * This routine initializes console interrupts, and does nothing
2872 * else. If you want the screen to clear, call tty_write with
2873 * the appropriate escape-sequence.
2874 */
2875
2876 static int __init con_init(void)
2877 {
2878 const char *display_desc = NULL;
2879 struct vc_data *vc;
2880 unsigned int currcons = 0, i;
2881
2882 acquire_console_sem();
2883
2884 if (conswitchp)
2885 display_desc = conswitchp->con_startup();
2886 if (!display_desc) {
2887 fg_console = 0;
2888 release_console_sem();
2889 return 0;
2890 }
2891
2892 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2893 struct con_driver *con_driver = &registered_con_driver[i];
2894
2895 if (con_driver->con == NULL) {
2896 con_driver->con = conswitchp;
2897 con_driver->desc = display_desc;
2898 con_driver->flag = CON_DRIVER_FLAG_INIT;
2899 con_driver->first = 0;
2900 con_driver->last = MAX_NR_CONSOLES - 1;
2901 break;
2902 }
2903 }
2904
2905 for (i = 0; i < MAX_NR_CONSOLES; i++)
2906 con_driver_map[i] = conswitchp;
2907
2908 if (blankinterval) {
2909 blank_state = blank_normal_wait;
2910 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2911 }
2912
2913 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2914 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2915 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2916 visual_init(vc, currcons, 1);
2917 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2918 vc_init(vc, vc->vc_rows, vc->vc_cols,
2919 currcons || !vc->vc_sw->con_save_screen);
2920 }
2921 currcons = fg_console = 0;
2922 master_display_fg = vc = vc_cons[currcons].d;
2923 set_origin(vc);
2924 save_screen(vc);
2925 gotoxy(vc, vc->vc_x, vc->vc_y);
2926 csi_J(vc, 0);
2927 update_screen(vc);
2928 printk("Console: %s %s %dx%d",
2929 vc->vc_can_do_color ? "colour" : "mono",
2930 display_desc, vc->vc_cols, vc->vc_rows);
2931 printable = 1;
2932 printk("\n");
2933
2934 release_console_sem();
2935
2936 #ifdef CONFIG_VT_CONSOLE
2937 register_console(&vt_console_driver);
2938 #endif
2939 return 0;
2940 }
2941 console_initcall(con_init);
2942
2943 static const struct tty_operations con_ops = {
2944 .open = con_open,
2945 .close = con_close,
2946 .write = con_write,
2947 .write_room = con_write_room,
2948 .put_char = con_put_char,
2949 .flush_chars = con_flush_chars,
2950 .chars_in_buffer = con_chars_in_buffer,
2951 .ioctl = vt_ioctl,
2952 #ifdef CONFIG_COMPAT
2953 .compat_ioctl = vt_compat_ioctl,
2954 #endif
2955 .stop = con_stop,
2956 .start = con_start,
2957 .throttle = con_throttle,
2958 .unthrottle = con_unthrottle,
2959 .resize = vt_resize,
2960 .shutdown = con_shutdown
2961 };
2962
2963 static struct cdev vc0_cdev;
2964
2965 int __init vty_init(const struct file_operations *console_fops)
2966 {
2967 cdev_init(&vc0_cdev, console_fops);
2968 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2969 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2970 panic("Couldn't register /dev/tty0 driver\n");
2971 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2972
2973 vcs_init();
2974
2975 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2976 if (!console_driver)
2977 panic("Couldn't allocate console driver\n");
2978 console_driver->owner = THIS_MODULE;
2979 console_driver->name = "tty";
2980 console_driver->name_base = 1;
2981 console_driver->major = TTY_MAJOR;
2982 console_driver->minor_start = 1;
2983 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2984 console_driver->init_termios = tty_std_termios;
2985 if (default_utf8)
2986 console_driver->init_termios.c_iflag |= IUTF8;
2987 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2988 tty_set_operations(console_driver, &con_ops);
2989 if (tty_register_driver(console_driver))
2990 panic("Couldn't register console driver\n");
2991 kbd_init();
2992 console_map_init();
2993 #ifdef CONFIG_MDA_CONSOLE
2994 mda_console_init();
2995 #endif
2996 return 0;
2997 }
2998
2999 #ifndef VT_SINGLE_DRIVER
3000
3001 static struct class *vtconsole_class;
3002
3003 static int bind_con_driver(const struct consw *csw, int first, int last,
3004 int deflt)
3005 {
3006 struct module *owner = csw->owner;
3007 const char *desc = NULL;
3008 struct con_driver *con_driver;
3009 int i, j = -1, k = -1, retval = -ENODEV;
3010
3011 if (!try_module_get(owner))
3012 return -ENODEV;
3013
3014 acquire_console_sem();
3015
3016 /* check if driver is registered */
3017 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3018 con_driver = &registered_con_driver[i];
3019
3020 if (con_driver->con == csw) {
3021 desc = con_driver->desc;
3022 retval = 0;
3023 break;
3024 }
3025 }
3026
3027 if (retval)
3028 goto err;
3029
3030 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3031 csw->con_startup();
3032 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3033 }
3034
3035 if (deflt) {
3036 if (conswitchp)
3037 module_put(conswitchp->owner);
3038
3039 __module_get(owner);
3040 conswitchp = csw;
3041 }
3042
3043 first = max(first, con_driver->first);
3044 last = min(last, con_driver->last);
3045
3046 for (i = first; i <= last; i++) {
3047 int old_was_color;
3048 struct vc_data *vc = vc_cons[i].d;
3049
3050 if (con_driver_map[i])
3051 module_put(con_driver_map[i]->owner);
3052 __module_get(owner);
3053 con_driver_map[i] = csw;
3054
3055 if (!vc || !vc->vc_sw)
3056 continue;
3057
3058 j = i;
3059
3060 if (CON_IS_VISIBLE(vc)) {
3061 k = i;
3062 save_screen(vc);
3063 }
3064
3065 old_was_color = vc->vc_can_do_color;
3066 vc->vc_sw->con_deinit(vc);
3067 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3068 visual_init(vc, i, 0);
3069 set_origin(vc);
3070 update_attr(vc);
3071
3072 /* If the console changed between mono <-> color, then
3073 * the attributes in the screenbuf will be wrong. The
3074 * following resets all attributes to something sane.
3075 */
3076 if (old_was_color != vc->vc_can_do_color)
3077 clear_buffer_attributes(vc);
3078 }
3079
3080 printk("Console: switching ");
3081 if (!deflt)
3082 printk("consoles %d-%d ", first+1, last+1);
3083 if (j >= 0) {
3084 struct vc_data *vc = vc_cons[j].d;
3085
3086 printk("to %s %s %dx%d\n",
3087 vc->vc_can_do_color ? "colour" : "mono",
3088 desc, vc->vc_cols, vc->vc_rows);
3089
3090 if (k >= 0) {
3091 vc = vc_cons[k].d;
3092 update_screen(vc);
3093 }
3094 } else
3095 printk("to %s\n", desc);
3096
3097 retval = 0;
3098 err:
3099 release_console_sem();
3100 module_put(owner);
3101 return retval;
3102 };
3103
3104 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3105 static int con_is_graphics(const struct consw *csw, int first, int last)
3106 {
3107 int i, retval = 0;
3108
3109 for (i = first; i <= last; i++) {
3110 struct vc_data *vc = vc_cons[i].d;
3111
3112 if (vc && vc->vc_mode == KD_GRAPHICS) {
3113 retval = 1;
3114 break;
3115 }
3116 }
3117
3118 return retval;
3119 }
3120
3121 /**
3122 * unbind_con_driver - unbind a console driver
3123 * @csw: pointer to console driver to unregister
3124 * @first: first in range of consoles that @csw should be unbound from
3125 * @last: last in range of consoles that @csw should be unbound from
3126 * @deflt: should next bound console driver be default after @csw is unbound?
3127 *
3128 * To unbind a driver from all possible consoles, pass 0 as @first and
3129 * %MAX_NR_CONSOLES as @last.
3130 *
3131 * @deflt controls whether the console that ends up replacing @csw should be
3132 * the default console.
3133 *
3134 * RETURNS:
3135 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3136 * or 0 on success.
3137 */
3138 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3139 {
3140 struct module *owner = csw->owner;
3141 const struct consw *defcsw = NULL;
3142 struct con_driver *con_driver = NULL, *con_back = NULL;
3143 int i, retval = -ENODEV;
3144
3145 if (!try_module_get(owner))
3146 return -ENODEV;
3147
3148 acquire_console_sem();
3149
3150 /* check if driver is registered and if it is unbindable */
3151 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3152 con_driver = &registered_con_driver[i];
3153
3154 if (con_driver->con == csw &&
3155 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3156 retval = 0;
3157 break;
3158 }
3159 }
3160
3161 if (retval) {
3162 release_console_sem();
3163 goto err;
3164 }
3165
3166 retval = -ENODEV;
3167
3168 /* check if backup driver exists */
3169 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3170 con_back = &registered_con_driver[i];
3171
3172 if (con_back->con &&
3173 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3174 defcsw = con_back->con;
3175 retval = 0;
3176 break;
3177 }
3178 }
3179
3180 if (retval) {
3181 release_console_sem();
3182 goto err;
3183 }
3184
3185 if (!con_is_bound(csw)) {
3186 release_console_sem();
3187 goto err;
3188 }
3189
3190 first = max(first, con_driver->first);
3191 last = min(last, con_driver->last);
3192
3193 for (i = first; i <= last; i++) {
3194 if (con_driver_map[i] == csw) {
3195 module_put(csw->owner);
3196 con_driver_map[i] = NULL;
3197 }
3198 }
3199
3200 if (!con_is_bound(defcsw)) {
3201 const struct consw *defconsw = conswitchp;
3202
3203 defcsw->con_startup();
3204 con_back->flag |= CON_DRIVER_FLAG_INIT;
3205 /*
3206 * vgacon may change the default driver to point
3207 * to dummycon, we restore it here...
3208 */
3209 conswitchp = defconsw;
3210 }
3211
3212 if (!con_is_bound(csw))
3213 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3214
3215 release_console_sem();
3216 /* ignore return value, binding should not fail */
3217 bind_con_driver(defcsw, first, last, deflt);
3218 err:
3219 module_put(owner);
3220 return retval;
3221
3222 }
3223 EXPORT_SYMBOL(unbind_con_driver);
3224
3225 static int vt_bind(struct con_driver *con)
3226 {
3227 const struct consw *defcsw = NULL, *csw = NULL;
3228 int i, more = 1, first = -1, last = -1, deflt = 0;
3229
3230 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3231 con_is_graphics(con->con, con->first, con->last))
3232 goto err;
3233
3234 csw = con->con;
3235
3236 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3237 struct con_driver *con = &registered_con_driver[i];
3238
3239 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3240 defcsw = con->con;
3241 break;
3242 }
3243 }
3244
3245 if (!defcsw)
3246 goto err;
3247
3248 while (more) {
3249 more = 0;
3250
3251 for (i = con->first; i <= con->last; i++) {
3252 if (con_driver_map[i] == defcsw) {
3253 if (first == -1)
3254 first = i;
3255 last = i;
3256 more = 1;
3257 } else if (first != -1)
3258 break;
3259 }
3260
3261 if (first == 0 && last == MAX_NR_CONSOLES -1)
3262 deflt = 1;
3263
3264 if (first != -1)
3265 bind_con_driver(csw, first, last, deflt);
3266
3267 first = -1;
3268 last = -1;
3269 deflt = 0;
3270 }
3271
3272 err:
3273 return 0;
3274 }
3275
3276 static int vt_unbind(struct con_driver *con)
3277 {
3278 const struct consw *csw = NULL;
3279 int i, more = 1, first = -1, last = -1, deflt = 0;
3280
3281 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3282 con_is_graphics(con->con, con->first, con->last))
3283 goto err;
3284
3285 csw = con->con;
3286
3287 while (more) {
3288 more = 0;
3289
3290 for (i = con->first; i <= con->last; i++) {
3291 if (con_driver_map[i] == csw) {
3292 if (first == -1)
3293 first = i;
3294 last = i;
3295 more = 1;
3296 } else if (first != -1)
3297 break;
3298 }
3299
3300 if (first == 0 && last == MAX_NR_CONSOLES -1)
3301 deflt = 1;
3302
3303 if (first != -1)
3304 unbind_con_driver(csw, first, last, deflt);
3305
3306 first = -1;
3307 last = -1;
3308 deflt = 0;
3309 }
3310
3311 err:
3312 return 0;
3313 }
3314 #else
3315 static inline int vt_bind(struct con_driver *con)
3316 {
3317 return 0;
3318 }
3319 static inline int vt_unbind(struct con_driver *con)
3320 {
3321 return 0;
3322 }
3323 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3324
3325 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3326 const char *buf, size_t count)
3327 {
3328 struct con_driver *con = dev_get_drvdata(dev);
3329 int bind = simple_strtoul(buf, NULL, 0);
3330
3331 if (bind)
3332 vt_bind(con);
3333 else
3334 vt_unbind(con);
3335
3336 return count;
3337 }
3338
3339 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3340 char *buf)
3341 {
3342 struct con_driver *con = dev_get_drvdata(dev);
3343 int bind = con_is_bound(con->con);
3344
3345 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3346 }
3347
3348 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3349 char *buf)
3350 {
3351 struct con_driver *con = dev_get_drvdata(dev);
3352
3353 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3354 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3355 con->desc);
3356
3357 }
3358
3359 static struct device_attribute device_attrs[] = {
3360 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3361 __ATTR(name, S_IRUGO, show_name, NULL),
3362 };
3363
3364 static int vtconsole_init_device(struct con_driver *con)
3365 {
3366 int i;
3367 int error = 0;
3368
3369 con->flag |= CON_DRIVER_FLAG_ATTR;
3370 dev_set_drvdata(con->dev, con);
3371 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3372 error = device_create_file(con->dev, &device_attrs[i]);
3373 if (error)
3374 break;
3375 }
3376
3377 if (error) {
3378 while (--i >= 0)
3379 device_remove_file(con->dev, &device_attrs[i]);
3380 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3381 }
3382
3383 return error;
3384 }
3385
3386 static void vtconsole_deinit_device(struct con_driver *con)
3387 {
3388 int i;
3389
3390 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3391 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3392 device_remove_file(con->dev, &device_attrs[i]);
3393 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3394 }
3395 }
3396
3397 /**
3398 * con_is_bound - checks if driver is bound to the console
3399 * @csw: console driver
3400 *
3401 * RETURNS: zero if unbound, nonzero if bound
3402 *
3403 * Drivers can call this and if zero, they should release
3404 * all resources allocated on con_startup()
3405 */
3406 int con_is_bound(const struct consw *csw)
3407 {
3408 int i, bound = 0;
3409
3410 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3411 if (con_driver_map[i] == csw) {
3412 bound = 1;
3413 break;
3414 }
3415 }
3416
3417 return bound;
3418 }
3419 EXPORT_SYMBOL(con_is_bound);
3420
3421 /**
3422 * con_debug_enter - prepare the console for the kernel debugger
3423 * @sw: console driver
3424 *
3425 * Called when the console is taken over by the kernel debugger, this
3426 * function needs to save the current console state, then put the console
3427 * into a state suitable for the kernel debugger.
3428 *
3429 * RETURNS:
3430 * Zero on success, nonzero if a failure occurred when trying to prepare
3431 * the console for the debugger.
3432 */
3433 int con_debug_enter(struct vc_data *vc)
3434 {
3435 int ret = 0;
3436
3437 saved_fg_console = fg_console;
3438 saved_last_console = last_console;
3439 saved_want_console = want_console;
3440 saved_vc_mode = vc->vc_mode;
3441 vc->vc_mode = KD_TEXT;
3442 console_blanked = 0;
3443 if (vc->vc_sw->con_debug_enter)
3444 ret = vc->vc_sw->con_debug_enter(vc);
3445 return ret;
3446 }
3447 EXPORT_SYMBOL_GPL(con_debug_enter);
3448
3449 /**
3450 * con_debug_leave - restore console state
3451 * @sw: console driver
3452 *
3453 * Restore the console state to what it was before the kernel debugger
3454 * was invoked.
3455 *
3456 * RETURNS:
3457 * Zero on success, nonzero if a failure occurred when trying to restore
3458 * the console.
3459 */
3460 int con_debug_leave(void)
3461 {
3462 struct vc_data *vc;
3463 int ret = 0;
3464
3465 fg_console = saved_fg_console;
3466 last_console = saved_last_console;
3467 want_console = saved_want_console;
3468 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3469
3470 vc = vc_cons[fg_console].d;
3471 if (vc->vc_sw->con_debug_leave)
3472 ret = vc->vc_sw->con_debug_leave(vc);
3473 return ret;
3474 }
3475 EXPORT_SYMBOL_GPL(con_debug_leave);
3476
3477 /**
3478 * register_con_driver - register console driver to console layer
3479 * @csw: console driver
3480 * @first: the first console to take over, minimum value is 0
3481 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3482 *
3483 * DESCRIPTION: This function registers a console driver which can later
3484 * bind to a range of consoles specified by @first and @last. It will
3485 * also initialize the console driver by calling con_startup().
3486 */
3487 int register_con_driver(const struct consw *csw, int first, int last)
3488 {
3489 struct module *owner = csw->owner;
3490 struct con_driver *con_driver;
3491 const char *desc;
3492 int i, retval = 0;
3493
3494 if (!try_module_get(owner))
3495 return -ENODEV;
3496
3497 acquire_console_sem();
3498
3499 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500 con_driver = &registered_con_driver[i];
3501
3502 /* already registered */
3503 if (con_driver->con == csw)
3504 retval = -EINVAL;
3505 }
3506
3507 if (retval)
3508 goto err;
3509
3510 desc = csw->con_startup();
3511
3512 if (!desc)
3513 goto err;
3514
3515 retval = -EINVAL;
3516
3517 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3518 con_driver = &registered_con_driver[i];
3519
3520 if (con_driver->con == NULL) {
3521 con_driver->con = csw;
3522 con_driver->desc = desc;
3523 con_driver->node = i;
3524 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3525 CON_DRIVER_FLAG_INIT;
3526 con_driver->first = first;
3527 con_driver->last = last;
3528 retval = 0;
3529 break;
3530 }
3531 }
3532
3533 if (retval)
3534 goto err;
3535
3536 con_driver->dev = device_create(vtconsole_class, NULL,
3537 MKDEV(0, con_driver->node),
3538 NULL, "vtcon%i",
3539 con_driver->node);
3540
3541 if (IS_ERR(con_driver->dev)) {
3542 printk(KERN_WARNING "Unable to create device for %s; "
3543 "errno = %ld\n", con_driver->desc,
3544 PTR_ERR(con_driver->dev));
3545 con_driver->dev = NULL;
3546 } else {
3547 vtconsole_init_device(con_driver);
3548 }
3549
3550 err:
3551 release_console_sem();
3552 module_put(owner);
3553 return retval;
3554 }
3555 EXPORT_SYMBOL(register_con_driver);
3556
3557 /**
3558 * unregister_con_driver - unregister console driver from console layer
3559 * @csw: console driver
3560 *
3561 * DESCRIPTION: All drivers that registers to the console layer must
3562 * call this function upon exit, or if the console driver is in a state
3563 * where it won't be able to handle console services, such as the
3564 * framebuffer console without loaded framebuffer drivers.
3565 *
3566 * The driver must unbind first prior to unregistration.
3567 */
3568 int unregister_con_driver(const struct consw *csw)
3569 {
3570 int i, retval = -ENODEV;
3571
3572 acquire_console_sem();
3573
3574 /* cannot unregister a bound driver */
3575 if (con_is_bound(csw))
3576 goto err;
3577
3578 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3579 struct con_driver *con_driver = &registered_con_driver[i];
3580
3581 if (con_driver->con == csw &&
3582 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3583 vtconsole_deinit_device(con_driver);
3584 device_destroy(vtconsole_class,
3585 MKDEV(0, con_driver->node));
3586 con_driver->con = NULL;
3587 con_driver->desc = NULL;
3588 con_driver->dev = NULL;
3589 con_driver->node = 0;
3590 con_driver->flag = 0;
3591 con_driver->first = 0;
3592 con_driver->last = 0;
3593 retval = 0;
3594 break;
3595 }
3596 }
3597 err:
3598 release_console_sem();
3599 return retval;
3600 }
3601 EXPORT_SYMBOL(unregister_con_driver);
3602
3603 /*
3604 * If we support more console drivers, this function is used
3605 * when a driver wants to take over some existing consoles
3606 * and become default driver for newly opened ones.
3607 *
3608 * take_over_console is basically a register followed by unbind
3609 */
3610 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3611 {
3612 int err;
3613
3614 err = register_con_driver(csw, first, last);
3615
3616 if (!err)
3617 bind_con_driver(csw, first, last, deflt);
3618
3619 return err;
3620 }
3621
3622 /*
3623 * give_up_console is a wrapper to unregister_con_driver. It will only
3624 * work if driver is fully unbound.
3625 */
3626 void give_up_console(const struct consw *csw)
3627 {
3628 unregister_con_driver(csw);
3629 }
3630
3631 static int __init vtconsole_class_init(void)
3632 {
3633 int i;
3634
3635 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3636 if (IS_ERR(vtconsole_class)) {
3637 printk(KERN_WARNING "Unable to create vt console class; "
3638 "errno = %ld\n", PTR_ERR(vtconsole_class));
3639 vtconsole_class = NULL;
3640 }
3641
3642 /* Add system drivers to sysfs */
3643 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3644 struct con_driver *con = &registered_con_driver[i];
3645
3646 if (con->con && !con->dev) {
3647 con->dev = device_create(vtconsole_class, NULL,
3648 MKDEV(0, con->node),
3649 NULL, "vtcon%i",
3650 con->node);
3651
3652 if (IS_ERR(con->dev)) {
3653 printk(KERN_WARNING "Unable to create "
3654 "device for %s; errno = %ld\n",
3655 con->desc, PTR_ERR(con->dev));
3656 con->dev = NULL;
3657 } else {
3658 vtconsole_init_device(con);
3659 }
3660 }
3661 }
3662
3663 return 0;
3664 }
3665 postcore_initcall(vtconsole_class_init);
3666
3667 #endif
3668
3669 /*
3670 * Screen blanking
3671 */
3672
3673 static int set_vesa_blanking(char __user *p)
3674 {
3675 unsigned int mode;
3676
3677 if (get_user(mode, p + 1))
3678 return -EFAULT;
3679
3680 vesa_blank_mode = (mode < 4) ? mode : 0;
3681 return 0;
3682 }
3683
3684 void do_blank_screen(int entering_gfx)
3685 {
3686 struct vc_data *vc = vc_cons[fg_console].d;
3687 int i;
3688
3689 WARN_CONSOLE_UNLOCKED();
3690
3691 if (console_blanked) {
3692 if (blank_state == blank_vesa_wait) {
3693 blank_state = blank_off;
3694 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3695 }
3696 return;
3697 }
3698
3699 /* entering graphics mode? */
3700 if (entering_gfx) {
3701 hide_cursor(vc);
3702 save_screen(vc);
3703 vc->vc_sw->con_blank(vc, -1, 1);
3704 console_blanked = fg_console + 1;
3705 blank_state = blank_off;
3706 set_origin(vc);
3707 return;
3708 }
3709
3710 if (blank_state != blank_normal_wait)
3711 return;
3712 blank_state = blank_off;
3713
3714 /* don't blank graphics */
3715 if (vc->vc_mode != KD_TEXT) {
3716 console_blanked = fg_console + 1;
3717 return;
3718 }
3719
3720 hide_cursor(vc);
3721 del_timer_sync(&console_timer);
3722 blank_timer_expired = 0;
3723
3724 save_screen(vc);
3725 /* In case we need to reset origin, blanking hook returns 1 */
3726 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3727 console_blanked = fg_console + 1;
3728 if (i)
3729 set_origin(vc);
3730
3731 if (console_blank_hook && console_blank_hook(1))
3732 return;
3733
3734 if (vesa_off_interval && vesa_blank_mode) {
3735 blank_state = blank_vesa_wait;
3736 mod_timer(&console_timer, jiffies + vesa_off_interval);
3737 }
3738 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3739 }
3740 EXPORT_SYMBOL(do_blank_screen);
3741
3742 /*
3743 * Called by timer as well as from vt_console_driver
3744 */
3745 void do_unblank_screen(int leaving_gfx)
3746 {
3747 struct vc_data *vc;
3748
3749 /* This should now always be called from a "sane" (read: can schedule)
3750 * context for the sake of the low level drivers, except in the special
3751 * case of oops_in_progress
3752 */
3753 if (!oops_in_progress)
3754 might_sleep();
3755
3756 WARN_CONSOLE_UNLOCKED();
3757
3758 ignore_poke = 0;
3759 if (!console_blanked)
3760 return;
3761 if (!vc_cons_allocated(fg_console)) {
3762 /* impossible */
3763 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3764 return;
3765 }
3766 vc = vc_cons[fg_console].d;
3767 if (vc->vc_mode != KD_TEXT)
3768 return; /* but leave console_blanked != 0 */
3769
3770 if (blankinterval) {
3771 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3772 blank_state = blank_normal_wait;
3773 }
3774
3775 console_blanked = 0;
3776 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3777 /* Low-level driver cannot restore -> do it ourselves */
3778 update_screen(vc);
3779 if (console_blank_hook)
3780 console_blank_hook(0);
3781 set_palette(vc);
3782 set_cursor(vc);
3783 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3784 }
3785 EXPORT_SYMBOL(do_unblank_screen);
3786
3787 /*
3788 * This is called by the outside world to cause a forced unblank, mostly for
3789 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3790 * call it with 1 as an argument and so force a mode restore... that may kill
3791 * X or at least garbage the screen but would also make the Oops visible...
3792 */
3793 void unblank_screen(void)
3794 {
3795 do_unblank_screen(0);
3796 }
3797
3798 /*
3799 * We defer the timer blanking to work queue so it can take the console mutex
3800 * (console operations can still happen at irq time, but only from printk which
3801 * has the console mutex. Not perfect yet, but better than no locking
3802 */
3803 static void blank_screen_t(unsigned long dummy)
3804 {
3805 if (unlikely(!keventd_up())) {
3806 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3807 return;
3808 }
3809 blank_timer_expired = 1;
3810 schedule_work(&console_work);
3811 }
3812
3813 void poke_blanked_console(void)
3814 {
3815 WARN_CONSOLE_UNLOCKED();
3816
3817 /* Add this so we quickly catch whoever might call us in a non
3818 * safe context. Nowadays, unblank_screen() isn't to be called in
3819 * atomic contexts and is allowed to schedule (with the special case
3820 * of oops_in_progress, but that isn't of any concern for this
3821 * function. --BenH.
3822 */
3823 might_sleep();
3824
3825 /* This isn't perfectly race free, but a race here would be mostly harmless,
3826 * at worse, we'll do a spurrious blank and it's unlikely
3827 */
3828 del_timer(&console_timer);
3829 blank_timer_expired = 0;
3830
3831 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3832 return;
3833 if (console_blanked)
3834 unblank_screen();
3835 else if (blankinterval) {
3836 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3837 blank_state = blank_normal_wait;
3838 }
3839 }
3840
3841 /*
3842 * Palettes
3843 */
3844
3845 static void set_palette(struct vc_data *vc)
3846 {
3847 WARN_CONSOLE_UNLOCKED();
3848
3849 if (vc->vc_mode != KD_GRAPHICS)
3850 vc->vc_sw->con_set_palette(vc, color_table);
3851 }
3852
3853 static int set_get_cmap(unsigned char __user *arg, int set)
3854 {
3855 int i, j, k;
3856
3857 WARN_CONSOLE_UNLOCKED();
3858
3859 for (i = 0; i < 16; i++)
3860 if (set) {
3861 get_user(default_red[i], arg++);
3862 get_user(default_grn[i], arg++);
3863 get_user(default_blu[i], arg++);
3864 } else {
3865 put_user(default_red[i], arg++);
3866 put_user(default_grn[i], arg++);
3867 put_user(default_blu[i], arg++);
3868 }
3869 if (set) {
3870 for (i = 0; i < MAX_NR_CONSOLES; i++)
3871 if (vc_cons_allocated(i)) {
3872 for (j = k = 0; j < 16; j++) {
3873 vc_cons[i].d->vc_palette[k++] = default_red[j];
3874 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3875 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3876 }
3877 set_palette(vc_cons[i].d);
3878 }
3879 }
3880 return 0;
3881 }
3882
3883 /*
3884 * Load palette into the DAC registers. arg points to a colour
3885 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3886 */
3887
3888 int con_set_cmap(unsigned char __user *arg)
3889 {
3890 int rc;
3891
3892 acquire_console_sem();
3893 rc = set_get_cmap (arg,1);
3894 release_console_sem();
3895
3896 return rc;
3897 }
3898
3899 int con_get_cmap(unsigned char __user *arg)
3900 {
3901 int rc;
3902
3903 acquire_console_sem();
3904 rc = set_get_cmap (arg,0);
3905 release_console_sem();
3906
3907 return rc;
3908 }
3909
3910 void reset_palette(struct vc_data *vc)
3911 {
3912 int j, k;
3913 for (j=k=0; j<16; j++) {
3914 vc->vc_palette[k++] = default_red[j];
3915 vc->vc_palette[k++] = default_grn[j];
3916 vc->vc_palette[k++] = default_blu[j];
3917 }
3918 set_palette(vc);
3919 }
3920
3921 /*
3922 * Font switching
3923 *
3924 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3925 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3926 * depending on width) reserved for each character which is kinda wasty, but
3927 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3928 * is upto the actual low-level console-driver convert data into its favorite
3929 * format (maybe we should add a `fontoffset' field to the `display'
3930 * structure so we won't have to convert the fontdata all the time.
3931 * /Jes
3932 */
3933
3934 #define max_font_size 65536
3935
3936 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3937 {
3938 struct console_font font;
3939 int rc = -EINVAL;
3940 int c;
3941
3942 if (vc->vc_mode != KD_TEXT)
3943 return -EINVAL;
3944
3945 if (op->data) {
3946 font.data = kmalloc(max_font_size, GFP_KERNEL);
3947 if (!font.data)
3948 return -ENOMEM;
3949 } else
3950 font.data = NULL;
3951
3952 acquire_console_sem();
3953 if (vc->vc_sw->con_font_get)
3954 rc = vc->vc_sw->con_font_get(vc, &font);
3955 else
3956 rc = -ENOSYS;
3957 release_console_sem();
3958
3959 if (rc)
3960 goto out;
3961
3962 c = (font.width+7)/8 * 32 * font.charcount;
3963
3964 if (op->data && font.charcount > op->charcount)
3965 rc = -ENOSPC;
3966 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3967 if (font.width > op->width || font.height > op->height)
3968 rc = -ENOSPC;
3969 } else {
3970 if (font.width != 8)
3971 rc = -EIO;
3972 else if ((op->height && font.height > op->height) ||
3973 font.height > 32)
3974 rc = -ENOSPC;
3975 }
3976 if (rc)
3977 goto out;
3978
3979 op->height = font.height;
3980 op->width = font.width;
3981 op->charcount = font.charcount;
3982
3983 if (op->data && copy_to_user(op->data, font.data, c))
3984 rc = -EFAULT;
3985
3986 out:
3987 kfree(font.data);
3988 return rc;
3989 }
3990
3991 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3992 {
3993 struct console_font font;
3994 int rc = -EINVAL;
3995 int size;
3996
3997 if (vc->vc_mode != KD_TEXT)
3998 return -EINVAL;
3999 if (!op->data)
4000 return -EINVAL;
4001 if (op->charcount > 512)
4002 return -EINVAL;
4003 if (!op->height) { /* Need to guess font height [compat] */
4004 int h, i;
4005 u8 __user *charmap = op->data;
4006 u8 tmp;
4007
4008 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4009 so that we can get rid of this soon */
4010 if (!(op->flags & KD_FONT_FLAG_OLD))
4011 return -EINVAL;
4012 for (h = 32; h > 0; h--)
4013 for (i = 0; i < op->charcount; i++) {
4014 if (get_user(tmp, &charmap[32*i+h-1]))
4015 return -EFAULT;
4016 if (tmp)
4017 goto nonzero;
4018 }
4019 return -EINVAL;
4020 nonzero:
4021 op->height = h;
4022 }
4023 if (op->width <= 0 || op->width > 32 || op->height > 32)
4024 return -EINVAL;
4025 size = (op->width+7)/8 * 32 * op->charcount;
4026 if (size > max_font_size)
4027 return -ENOSPC;
4028 font.charcount = op->charcount;
4029 font.height = op->height;
4030 font.width = op->width;
4031 font.data = memdup_user(op->data, size);
4032 if (IS_ERR(font.data))
4033 return PTR_ERR(font.data);
4034 acquire_console_sem();
4035 if (vc->vc_sw->con_font_set)
4036 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4037 else
4038 rc = -ENOSYS;
4039 release_console_sem();
4040 kfree(font.data);
4041 return rc;
4042 }
4043
4044 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4045 {
4046 struct console_font font = {.width = op->width, .height = op->height};
4047 char name[MAX_FONT_NAME];
4048 char *s = name;
4049 int rc;
4050
4051 if (vc->vc_mode != KD_TEXT)
4052 return -EINVAL;
4053
4054 if (!op->data)
4055 s = NULL;
4056 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4057 return -EFAULT;
4058 else
4059 name[MAX_FONT_NAME - 1] = 0;
4060
4061 acquire_console_sem();
4062 if (vc->vc_sw->con_font_default)
4063 rc = vc->vc_sw->con_font_default(vc, &font, s);
4064 else
4065 rc = -ENOSYS;
4066 release_console_sem();
4067 if (!rc) {
4068 op->width = font.width;
4069 op->height = font.height;
4070 }
4071 return rc;
4072 }
4073
4074 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4075 {
4076 int con = op->height;
4077 int rc;
4078
4079 if (vc->vc_mode != KD_TEXT)
4080 return -EINVAL;
4081
4082 acquire_console_sem();
4083 if (!vc->vc_sw->con_font_copy)
4084 rc = -ENOSYS;
4085 else if (con < 0 || !vc_cons_allocated(con))
4086 rc = -ENOTTY;
4087 else if (con == vc->vc_num) /* nothing to do */
4088 rc = 0;
4089 else
4090 rc = vc->vc_sw->con_font_copy(vc, con);
4091 release_console_sem();
4092 return rc;
4093 }
4094
4095 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4096 {
4097 switch (op->op) {
4098 case KD_FONT_OP_SET:
4099 return con_font_set(vc, op);
4100 case KD_FONT_OP_GET:
4101 return con_font_get(vc, op);
4102 case KD_FONT_OP_SET_DEFAULT:
4103 return con_font_default(vc, op);
4104 case KD_FONT_OP_COPY:
4105 return con_font_copy(vc, op);
4106 }
4107 return -ENOSYS;
4108 }
4109
4110 /*
4111 * Interface exported to selection and vcs.
4112 */
4113
4114 /* used by selection */
4115 u16 screen_glyph(struct vc_data *vc, int offset)
4116 {
4117 u16 w = scr_readw(screenpos(vc, offset, 1));
4118 u16 c = w & 0xff;
4119
4120 if (w & vc->vc_hi_font_mask)
4121 c |= 0x100;
4122 return c;
4123 }
4124 EXPORT_SYMBOL_GPL(screen_glyph);
4125
4126 /* used by vcs - note the word offset */
4127 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4128 {
4129 return screenpos(vc, 2 * w_offset, viewed);
4130 }
4131
4132 void getconsxy(struct vc_data *vc, unsigned char *p)
4133 {
4134 p[0] = vc->vc_x;
4135 p[1] = vc->vc_y;
4136 }
4137
4138 void putconsxy(struct vc_data *vc, unsigned char *p)
4139 {
4140 hide_cursor(vc);
4141 gotoxy(vc, p[0], p[1]);
4142 set_cursor(vc);
4143 }
4144
4145 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4146 {
4147 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4148 return softcursor_original;
4149 return scr_readw(org);
4150 }
4151
4152 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4153 {
4154 scr_writew(val, org);
4155 if ((unsigned long)org == vc->vc_pos) {
4156 softcursor_original = -1;
4157 add_softcursor(vc);
4158 }
4159 }
4160
4161 /*
4162 * Visible symbols for modules
4163 */
4164
4165 EXPORT_SYMBOL(color_table);
4166 EXPORT_SYMBOL(default_red);
4167 EXPORT_SYMBOL(default_grn);
4168 EXPORT_SYMBOL(default_blu);
4169 EXPORT_SYMBOL(update_region);
4170 EXPORT_SYMBOL(redraw_screen);
4171 EXPORT_SYMBOL(vc_resize);
4172 EXPORT_SYMBOL(fg_console);
4173 EXPORT_SYMBOL(console_blank_hook);
4174 EXPORT_SYMBOL(console_blanked);
4175 EXPORT_SYMBOL(vc_cons);
4176 EXPORT_SYMBOL(global_cursor_default);
4177 #ifndef VT_SINGLE_DRIVER
4178 EXPORT_SYMBOL(take_over_console);
4179 EXPORT_SYMBOL(give_up_console);
4180 #endif
kernel-based virtual machine