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Merge branch 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux
[deliverable/linux.git] / drivers / char / vt.c
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 #include <linux/kdb.h>
108
109 #define MAX_NR_CON_DRIVER 16
110
111 #define CON_DRIVER_FLAG_MODULE 1
112 #define CON_DRIVER_FLAG_INIT 2
113 #define CON_DRIVER_FLAG_ATTR 4
114
115 struct con_driver {
116 const struct consw *con;
117 const char *desc;
118 struct device *dev;
119 int node;
120 int first;
121 int last;
122 int flag;
123 };
124
125 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
126 const struct consw *conswitchp;
127
128 /* A bitmap for codes <32. A bit of 1 indicates that the code
129 * corresponding to that bit number invokes some special action
130 * (such as cursor movement) and should not be displayed as a
131 * glyph unless the disp_ctrl mode is explicitly enabled.
132 */
133 #define CTRL_ACTION 0x0d00ff81
134 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
135
136 /*
137 * Here is the default bell parameters: 750HZ, 1/8th of a second
138 */
139 #define DEFAULT_BELL_PITCH 750
140 #define DEFAULT_BELL_DURATION (HZ/8)
141
142 struct vc vc_cons [MAX_NR_CONSOLES];
143
144 #ifndef VT_SINGLE_DRIVER
145 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
146 #endif
147
148 static int con_open(struct tty_struct *, struct file *);
149 static void vc_init(struct vc_data *vc, unsigned int rows,
150 unsigned int cols, int do_clear);
151 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
152 static void save_cur(struct vc_data *vc);
153 static void reset_terminal(struct vc_data *vc, int do_clear);
154 static void con_flush_chars(struct tty_struct *tty);
155 static int set_vesa_blanking(char __user *p);
156 static void set_cursor(struct vc_data *vc);
157 static void hide_cursor(struct vc_data *vc);
158 static void console_callback(struct work_struct *ignored);
159 static void blank_screen_t(unsigned long dummy);
160 static void set_palette(struct vc_data *vc);
161
162 static int printable; /* Is console ready for printing? */
163 int default_utf8 = true;
164 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
165 int global_cursor_default = -1;
166 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
167
168 static int cur_default = CUR_DEFAULT;
169 module_param(cur_default, int, S_IRUGO | S_IWUSR);
170
171 /*
172 * ignore_poke: don't unblank the screen when things are typed. This is
173 * mainly for the privacy of braille terminal users.
174 */
175 static int ignore_poke;
176
177 int do_poke_blanked_console;
178 int console_blanked;
179
180 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
181 static int vesa_off_interval;
182 static int blankinterval = 10*60;
183 core_param(consoleblank, blankinterval, int, 0444);
184
185 static DECLARE_WORK(console_work, console_callback);
186
187 /*
188 * fg_console is the current virtual console,
189 * last_console is the last used one,
190 * want_console is the console we want to switch to,
191 * saved_* variants are for save/restore around kernel debugger enter/leave
192 */
193 int fg_console;
194 int last_console;
195 int want_console = -1;
196 int saved_fg_console;
197 int saved_last_console;
198 int saved_want_console;
199 int saved_vc_mode;
200
201 /*
202 * For each existing display, we have a pointer to console currently visible
203 * on that display, allowing consoles other than fg_console to be refreshed
204 * appropriately. Unless the low-level driver supplies its own display_fg
205 * variable, we use this one for the "master display".
206 */
207 static struct vc_data *master_display_fg;
208
209 /*
210 * Unfortunately, we need to delay tty echo when we're currently writing to the
211 * console since the code is (and always was) not re-entrant, so we schedule
212 * all flip requests to process context with schedule-task() and run it from
213 * console_callback().
214 */
215
216 /*
217 * For the same reason, we defer scrollback to the console callback.
218 */
219 static int scrollback_delta;
220
221 /*
222 * Hook so that the power management routines can (un)blank
223 * the console on our behalf.
224 */
225 int (*console_blank_hook)(int);
226
227 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
228 static int blank_state;
229 static int blank_timer_expired;
230 enum {
231 blank_off = 0,
232 blank_normal_wait,
233 blank_vesa_wait,
234 };
235
236 /*
237 * Notifier list for console events.
238 */
239 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
240
241 int register_vt_notifier(struct notifier_block *nb)
242 {
243 return atomic_notifier_chain_register(&vt_notifier_list, nb);
244 }
245 EXPORT_SYMBOL_GPL(register_vt_notifier);
246
247 int unregister_vt_notifier(struct notifier_block *nb)
248 {
249 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
250 }
251 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
252
253 static void notify_write(struct vc_data *vc, unsigned int unicode)
254 {
255 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
256 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
257 }
258
259 static void notify_update(struct vc_data *vc)
260 {
261 struct vt_notifier_param param = { .vc = vc };
262 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
263 }
264 /*
265 * Low-Level Functions
266 */
267
268 #define IS_FG(vc) ((vc)->vc_num == fg_console)
269
270 #ifdef VT_BUF_VRAM_ONLY
271 #define DO_UPDATE(vc) 0
272 #else
273 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
274 #endif
275
276 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
277 {
278 unsigned short *p;
279
280 if (!viewed)
281 p = (unsigned short *)(vc->vc_origin + offset);
282 else if (!vc->vc_sw->con_screen_pos)
283 p = (unsigned short *)(vc->vc_visible_origin + offset);
284 else
285 p = vc->vc_sw->con_screen_pos(vc, offset);
286 return p;
287 }
288
289 static inline void scrolldelta(int lines)
290 {
291 scrollback_delta += lines;
292 schedule_console_callback();
293 }
294
295 void schedule_console_callback(void)
296 {
297 schedule_work(&console_work);
298 }
299
300 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
301 {
302 unsigned short *d, *s;
303
304 if (t+nr >= b)
305 nr = b - t - 1;
306 if (b > vc->vc_rows || t >= b || nr < 1)
307 return;
308 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
309 return;
310 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
311 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
312 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
313 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
314 vc->vc_size_row * nr);
315 }
316
317 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
318 {
319 unsigned short *s;
320 unsigned int step;
321
322 if (t+nr >= b)
323 nr = b - t - 1;
324 if (b > vc->vc_rows || t >= b || nr < 1)
325 return;
326 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
327 return;
328 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
329 step = vc->vc_cols * nr;
330 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
331 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
332 }
333
334 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
335 {
336 #ifndef VT_BUF_VRAM_ONLY
337 unsigned int xx, yy, offset;
338 u16 *p;
339
340 p = (u16 *) start;
341 if (!vc->vc_sw->con_getxy) {
342 offset = (start - vc->vc_origin) / 2;
343 xx = offset % vc->vc_cols;
344 yy = offset / vc->vc_cols;
345 } else {
346 int nxx, nyy;
347 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
348 xx = nxx; yy = nyy;
349 }
350 for(;;) {
351 u16 attrib = scr_readw(p) & 0xff00;
352 int startx = xx;
353 u16 *q = p;
354 while (xx < vc->vc_cols && count) {
355 if (attrib != (scr_readw(p) & 0xff00)) {
356 if (p > q)
357 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
358 startx = xx;
359 q = p;
360 attrib = scr_readw(p) & 0xff00;
361 }
362 p++;
363 xx++;
364 count--;
365 }
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 if (!count)
369 break;
370 xx = 0;
371 yy++;
372 if (vc->vc_sw->con_getxy) {
373 p = (u16 *)start;
374 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
375 }
376 }
377 #endif
378 }
379
380 void update_region(struct vc_data *vc, unsigned long start, int count)
381 {
382 WARN_CONSOLE_UNLOCKED();
383
384 if (DO_UPDATE(vc)) {
385 hide_cursor(vc);
386 do_update_region(vc, start, count);
387 set_cursor(vc);
388 }
389 }
390
391 /* Structure of attributes is hardware-dependent */
392
393 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
394 u8 _underline, u8 _reverse, u8 _italic)
395 {
396 if (vc->vc_sw->con_build_attr)
397 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
398 _blink, _underline, _reverse, _italic);
399
400 #ifndef VT_BUF_VRAM_ONLY
401 /*
402 * ++roman: I completely changed the attribute format for monochrome
403 * mode (!can_do_color). The formerly used MDA (monochrome display
404 * adapter) format didn't allow the combination of certain effects.
405 * Now the attribute is just a bit vector:
406 * Bit 0..1: intensity (0..2)
407 * Bit 2 : underline
408 * Bit 3 : reverse
409 * Bit 7 : blink
410 */
411 {
412 u8 a = _color;
413 if (!vc->vc_can_do_color)
414 return _intensity |
415 (_italic ? 2 : 0) |
416 (_underline ? 4 : 0) |
417 (_reverse ? 8 : 0) |
418 (_blink ? 0x80 : 0);
419 if (_italic)
420 a = (a & 0xF0) | vc->vc_itcolor;
421 else if (_underline)
422 a = (a & 0xf0) | vc->vc_ulcolor;
423 else if (_intensity == 0)
424 a = (a & 0xf0) | vc->vc_ulcolor;
425 if (_reverse)
426 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
427 if (_blink)
428 a ^= 0x80;
429 if (_intensity == 2)
430 a ^= 0x08;
431 if (vc->vc_hi_font_mask == 0x100)
432 a <<= 1;
433 return a;
434 }
435 #else
436 return 0;
437 #endif
438 }
439
440 static void update_attr(struct vc_data *vc)
441 {
442 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
443 vc->vc_blink, vc->vc_underline,
444 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
445 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
446 }
447
448 /* Note: inverting the screen twice should revert to the original state */
449 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
450 {
451 unsigned short *p;
452
453 WARN_CONSOLE_UNLOCKED();
454
455 count /= 2;
456 p = screenpos(vc, offset, viewed);
457 if (vc->vc_sw->con_invert_region)
458 vc->vc_sw->con_invert_region(vc, p, count);
459 #ifndef VT_BUF_VRAM_ONLY
460 else {
461 u16 *q = p;
462 int cnt = count;
463 u16 a;
464
465 if (!vc->vc_can_do_color) {
466 while (cnt--) {
467 a = scr_readw(q);
468 a ^= 0x0800;
469 scr_writew(a, q);
470 q++;
471 }
472 } else if (vc->vc_hi_font_mask == 0x100) {
473 while (cnt--) {
474 a = scr_readw(q);
475 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
476 scr_writew(a, q);
477 q++;
478 }
479 } else {
480 while (cnt--) {
481 a = scr_readw(q);
482 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
483 scr_writew(a, q);
484 q++;
485 }
486 }
487 }
488 #endif
489 if (DO_UPDATE(vc))
490 do_update_region(vc, (unsigned long) p, count);
491 }
492
493 /* used by selection: complement pointer position */
494 void complement_pos(struct vc_data *vc, int offset)
495 {
496 static int old_offset = -1;
497 static unsigned short old;
498 static unsigned short oldx, oldy;
499
500 WARN_CONSOLE_UNLOCKED();
501
502 if (old_offset != -1 && old_offset >= 0 &&
503 old_offset < vc->vc_screenbuf_size) {
504 scr_writew(old, screenpos(vc, old_offset, 1));
505 if (DO_UPDATE(vc))
506 vc->vc_sw->con_putc(vc, old, oldy, oldx);
507 }
508
509 old_offset = offset;
510
511 if (offset != -1 && offset >= 0 &&
512 offset < vc->vc_screenbuf_size) {
513 unsigned short new;
514 unsigned short *p;
515 p = screenpos(vc, offset, 1);
516 old = scr_readw(p);
517 new = old ^ vc->vc_complement_mask;
518 scr_writew(new, p);
519 if (DO_UPDATE(vc)) {
520 oldx = (offset >> 1) % vc->vc_cols;
521 oldy = (offset >> 1) / vc->vc_cols;
522 vc->vc_sw->con_putc(vc, new, oldy, oldx);
523 }
524 }
525
526 }
527
528 static void insert_char(struct vc_data *vc, unsigned int nr)
529 {
530 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
531
532 p = q + vc->vc_cols - nr - vc->vc_x;
533 while (--p >= q)
534 scr_writew(scr_readw(p), p + nr);
535 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
536 vc->vc_need_wrap = 0;
537 if (DO_UPDATE(vc)) {
538 unsigned short oldattr = vc->vc_attr;
539 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
540 vc->vc_cols - vc->vc_x - nr);
541 vc->vc_attr = vc->vc_video_erase_char >> 8;
542 while (nr--)
543 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
544 vc->vc_attr = oldattr;
545 }
546 }
547
548 static void delete_char(struct vc_data *vc, unsigned int nr)
549 {
550 unsigned int i = vc->vc_x;
551 unsigned short *p = (unsigned short *)vc->vc_pos;
552
553 while (++i <= vc->vc_cols - nr) {
554 scr_writew(scr_readw(p+nr), p);
555 p++;
556 }
557 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
558 vc->vc_need_wrap = 0;
559 if (DO_UPDATE(vc)) {
560 unsigned short oldattr = vc->vc_attr;
561 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
562 vc->vc_cols - vc->vc_x - nr);
563 vc->vc_attr = vc->vc_video_erase_char >> 8;
564 while (nr--)
565 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
566 vc->vc_cols - 1 - nr);
567 vc->vc_attr = oldattr;
568 }
569 }
570
571 static int softcursor_original;
572
573 static void add_softcursor(struct vc_data *vc)
574 {
575 int i = scr_readw((u16 *) vc->vc_pos);
576 u32 type = vc->vc_cursor_type;
577
578 if (! (type & 0x10)) return;
579 if (softcursor_original != -1) return;
580 softcursor_original = i;
581 i |= ((type >> 8) & 0xff00 );
582 i ^= ((type) & 0xff00 );
583 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
584 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
585 scr_writew(i, (u16 *) vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
588 }
589
590 static void hide_softcursor(struct vc_data *vc)
591 {
592 if (softcursor_original != -1) {
593 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
594 if (DO_UPDATE(vc))
595 vc->vc_sw->con_putc(vc, softcursor_original,
596 vc->vc_y, vc->vc_x);
597 softcursor_original = -1;
598 }
599 }
600
601 static void hide_cursor(struct vc_data *vc)
602 {
603 if (vc == sel_cons)
604 clear_selection();
605 vc->vc_sw->con_cursor(vc, CM_ERASE);
606 hide_softcursor(vc);
607 }
608
609 static void set_cursor(struct vc_data *vc)
610 {
611 if (!IS_FG(vc) || console_blanked ||
612 vc->vc_mode == KD_GRAPHICS)
613 return;
614 if (vc->vc_deccm) {
615 if (vc == sel_cons)
616 clear_selection();
617 add_softcursor(vc);
618 if ((vc->vc_cursor_type & 0x0f) != 1)
619 vc->vc_sw->con_cursor(vc, CM_DRAW);
620 } else
621 hide_cursor(vc);
622 }
623
624 static void set_origin(struct vc_data *vc)
625 {
626 WARN_CONSOLE_UNLOCKED();
627
628 if (!CON_IS_VISIBLE(vc) ||
629 !vc->vc_sw->con_set_origin ||
630 !vc->vc_sw->con_set_origin(vc))
631 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
632 vc->vc_visible_origin = vc->vc_origin;
633 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
634 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
635 }
636
637 static inline void save_screen(struct vc_data *vc)
638 {
639 WARN_CONSOLE_UNLOCKED();
640
641 if (vc->vc_sw->con_save_screen)
642 vc->vc_sw->con_save_screen(vc);
643 }
644
645 /*
646 * Redrawing of screen
647 */
648
649 static void clear_buffer_attributes(struct vc_data *vc)
650 {
651 unsigned short *p = (unsigned short *)vc->vc_origin;
652 int count = vc->vc_screenbuf_size / 2;
653 int mask = vc->vc_hi_font_mask | 0xff;
654
655 for (; count > 0; count--, p++) {
656 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
657 }
658 }
659
660 void redraw_screen(struct vc_data *vc, int is_switch)
661 {
662 int redraw = 0;
663
664 WARN_CONSOLE_UNLOCKED();
665
666 if (!vc) {
667 /* strange ... */
668 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
669 return;
670 }
671
672 if (is_switch) {
673 struct vc_data *old_vc = vc_cons[fg_console].d;
674 if (old_vc == vc)
675 return;
676 if (!CON_IS_VISIBLE(vc))
677 redraw = 1;
678 *vc->vc_display_fg = vc;
679 fg_console = vc->vc_num;
680 hide_cursor(old_vc);
681 if (!CON_IS_VISIBLE(old_vc)) {
682 save_screen(old_vc);
683 set_origin(old_vc);
684 }
685 } else {
686 hide_cursor(vc);
687 redraw = 1;
688 }
689
690 if (redraw) {
691 int update;
692 int old_was_color = vc->vc_can_do_color;
693
694 set_origin(vc);
695 update = vc->vc_sw->con_switch(vc);
696 set_palette(vc);
697 /*
698 * If console changed from mono<->color, the best we can do
699 * is to clear the buffer attributes. As it currently stands,
700 * rebuilding new attributes from the old buffer is not doable
701 * without overly complex code.
702 */
703 if (old_was_color != vc->vc_can_do_color) {
704 update_attr(vc);
705 clear_buffer_attributes(vc);
706 }
707 if (update && vc->vc_mode != KD_GRAPHICS)
708 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
709 }
710 set_cursor(vc);
711 if (is_switch) {
712 set_leds();
713 compute_shiftstate();
714 notify_update(vc);
715 }
716 }
717
718 /*
719 * Allocation, freeing and resizing of VTs.
720 */
721
722 int vc_cons_allocated(unsigned int i)
723 {
724 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
725 }
726
727 static void visual_init(struct vc_data *vc, int num, int init)
728 {
729 /* ++Geert: vc->vc_sw->con_init determines console size */
730 if (vc->vc_sw)
731 module_put(vc->vc_sw->owner);
732 vc->vc_sw = conswitchp;
733 #ifndef VT_SINGLE_DRIVER
734 if (con_driver_map[num])
735 vc->vc_sw = con_driver_map[num];
736 #endif
737 __module_get(vc->vc_sw->owner);
738 vc->vc_num = num;
739 vc->vc_display_fg = &master_display_fg;
740 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
741 vc->vc_uni_pagedir = 0;
742 vc->vc_hi_font_mask = 0;
743 vc->vc_complement_mask = 0;
744 vc->vc_can_do_color = 0;
745 vc->vc_sw->con_init(vc, init);
746 if (!vc->vc_complement_mask)
747 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
748 vc->vc_s_complement_mask = vc->vc_complement_mask;
749 vc->vc_size_row = vc->vc_cols << 1;
750 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
751 }
752
753 int vc_allocate(unsigned int currcons) /* return 0 on success */
754 {
755 WARN_CONSOLE_UNLOCKED();
756
757 if (currcons >= MAX_NR_CONSOLES)
758 return -ENXIO;
759 if (!vc_cons[currcons].d) {
760 struct vc_data *vc;
761 struct vt_notifier_param param;
762
763 /* prevent users from taking too much memory */
764 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
765 return -EPERM;
766
767 /* due to the granularity of kmalloc, we waste some memory here */
768 /* the alloc is done in two steps, to optimize the common situation
769 of a 25x80 console (structsize=216, screenbuf_size=4000) */
770 /* although the numbers above are not valid since long ago, the
771 point is still up-to-date and the comment still has its value
772 even if only as a historical artifact. --mj, July 1998 */
773 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
774 if (!vc)
775 return -ENOMEM;
776 vc_cons[currcons].d = vc;
777 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
778 visual_init(vc, currcons, 1);
779 if (!*vc->vc_uni_pagedir_loc)
780 con_set_default_unimap(vc);
781 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
782 if (!vc->vc_screenbuf) {
783 kfree(vc);
784 vc_cons[currcons].d = NULL;
785 return -ENOMEM;
786 }
787
788 /* If no drivers have overridden us and the user didn't pass a
789 boot option, default to displaying the cursor */
790 if (global_cursor_default == -1)
791 global_cursor_default = 1;
792
793 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
794 vcs_make_sysfs(currcons);
795 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
796 }
797 return 0;
798 }
799
800 static inline int resize_screen(struct vc_data *vc, int width, int height,
801 int user)
802 {
803 /* Resizes the resolution of the display adapater */
804 int err = 0;
805
806 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
807 err = vc->vc_sw->con_resize(vc, width, height, user);
808
809 return err;
810 }
811
812 /*
813 * Change # of rows and columns (0 means unchanged/the size of fg_console)
814 * [this is to be used together with some user program
815 * like resize that changes the hardware videomode]
816 */
817 #define VC_RESIZE_MAXCOL (32767)
818 #define VC_RESIZE_MAXROW (32767)
819
820 /**
821 * vc_do_resize - resizing method for the tty
822 * @tty: tty being resized
823 * @real_tty: real tty (different to tty if a pty/tty pair)
824 * @vc: virtual console private data
825 * @cols: columns
826 * @lines: lines
827 *
828 * Resize a virtual console, clipping according to the actual constraints.
829 * If the caller passes a tty structure then update the termios winsize
830 * information and perform any necessary signal handling.
831 *
832 * Caller must hold the console semaphore. Takes the termios mutex and
833 * ctrl_lock of the tty IFF a tty is passed.
834 */
835
836 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
837 unsigned int cols, unsigned int lines)
838 {
839 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
840 unsigned long end;
841 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
842 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
843 unsigned int user;
844 unsigned short *newscreen;
845
846 WARN_CONSOLE_UNLOCKED();
847
848 if (!vc)
849 return -ENXIO;
850
851 user = vc->vc_resize_user;
852 vc->vc_resize_user = 0;
853
854 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
855 return -EINVAL;
856
857 new_cols = (cols ? cols : vc->vc_cols);
858 new_rows = (lines ? lines : vc->vc_rows);
859 new_row_size = new_cols << 1;
860 new_screen_size = new_row_size * new_rows;
861
862 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
863 return 0;
864
865 newscreen = kmalloc(new_screen_size, GFP_USER);
866 if (!newscreen)
867 return -ENOMEM;
868
869 old_rows = vc->vc_rows;
870 old_cols = vc->vc_cols;
871 old_row_size = vc->vc_size_row;
872 old_screen_size = vc->vc_screenbuf_size;
873
874 err = resize_screen(vc, new_cols, new_rows, user);
875 if (err) {
876 kfree(newscreen);
877 return err;
878 }
879
880 vc->vc_rows = new_rows;
881 vc->vc_cols = new_cols;
882 vc->vc_size_row = new_row_size;
883 vc->vc_screenbuf_size = new_screen_size;
884
885 rlth = min(old_row_size, new_row_size);
886 rrem = new_row_size - rlth;
887 old_origin = vc->vc_origin;
888 new_origin = (long) newscreen;
889 new_scr_end = new_origin + new_screen_size;
890
891 if (vc->vc_y > new_rows) {
892 if (old_rows - vc->vc_y < new_rows) {
893 /*
894 * Cursor near the bottom, copy contents from the
895 * bottom of buffer
896 */
897 old_origin += (old_rows - new_rows) * old_row_size;
898 end = vc->vc_scr_end;
899 } else {
900 /*
901 * Cursor is in no man's land, copy 1/2 screenful
902 * from the top and bottom of cursor position
903 */
904 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
905 end = old_origin + (old_row_size * new_rows);
906 }
907 } else
908 /*
909 * Cursor near the top, copy contents from the top of buffer
910 */
911 end = (old_rows > new_rows) ? old_origin +
912 (old_row_size * new_rows) :
913 vc->vc_scr_end;
914
915 update_attr(vc);
916
917 while (old_origin < end) {
918 scr_memcpyw((unsigned short *) new_origin,
919 (unsigned short *) old_origin, rlth);
920 if (rrem)
921 scr_memsetw((void *)(new_origin + rlth),
922 vc->vc_video_erase_char, rrem);
923 old_origin += old_row_size;
924 new_origin += new_row_size;
925 }
926 if (new_scr_end > new_origin)
927 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
928 new_scr_end - new_origin);
929 kfree(vc->vc_screenbuf);
930 vc->vc_screenbuf = newscreen;
931 vc->vc_screenbuf_size = new_screen_size;
932 set_origin(vc);
933
934 /* do part of a reset_terminal() */
935 vc->vc_top = 0;
936 vc->vc_bottom = vc->vc_rows;
937 gotoxy(vc, vc->vc_x, vc->vc_y);
938 save_cur(vc);
939
940 if (tty) {
941 /* Rewrite the requested winsize data with the actual
942 resulting sizes */
943 struct winsize ws;
944 memset(&ws, 0, sizeof(ws));
945 ws.ws_row = vc->vc_rows;
946 ws.ws_col = vc->vc_cols;
947 ws.ws_ypixel = vc->vc_scan_lines;
948 tty_do_resize(tty, &ws);
949 }
950
951 if (CON_IS_VISIBLE(vc))
952 update_screen(vc);
953 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
954 return err;
955 }
956
957 /**
958 * vc_resize - resize a VT
959 * @vc: virtual console
960 * @cols: columns
961 * @rows: rows
962 *
963 * Resize a virtual console as seen from the console end of things. We
964 * use the common vc_do_resize methods to update the structures. The
965 * caller must hold the console sem to protect console internals and
966 * vc->vc_tty
967 */
968
969 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
970 {
971 return vc_do_resize(vc->vc_tty, vc, cols, rows);
972 }
973
974 /**
975 * vt_resize - resize a VT
976 * @tty: tty to resize
977 * @ws: winsize attributes
978 *
979 * Resize a virtual terminal. This is called by the tty layer as we
980 * register our own handler for resizing. The mutual helper does all
981 * the actual work.
982 *
983 * Takes the console sem and the called methods then take the tty
984 * termios_mutex and the tty ctrl_lock in that order.
985 */
986 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
987 {
988 struct vc_data *vc = tty->driver_data;
989 int ret;
990
991 acquire_console_sem();
992 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
993 release_console_sem();
994 return ret;
995 }
996
997 void vc_deallocate(unsigned int currcons)
998 {
999 WARN_CONSOLE_UNLOCKED();
1000
1001 if (vc_cons_allocated(currcons)) {
1002 struct vc_data *vc = vc_cons[currcons].d;
1003 struct vt_notifier_param param = { .vc = vc };
1004
1005 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1006 vcs_remove_sysfs(currcons);
1007 vc->vc_sw->con_deinit(vc);
1008 put_pid(vc->vt_pid);
1009 module_put(vc->vc_sw->owner);
1010 kfree(vc->vc_screenbuf);
1011 if (currcons >= MIN_NR_CONSOLES)
1012 kfree(vc);
1013 vc_cons[currcons].d = NULL;
1014 }
1015 }
1016
1017 /*
1018 * VT102 emulator
1019 */
1020
1021 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1022 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1023 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1024
1025 #define decarm VC_REPEAT
1026 #define decckm VC_CKMODE
1027 #define kbdapplic VC_APPLIC
1028 #define lnm VC_CRLF
1029
1030 /*
1031 * this is what the terminal answers to a ESC-Z or csi0c query.
1032 */
1033 #define VT100ID "\033[?1;2c"
1034 #define VT102ID "\033[?6c"
1035
1036 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1037 8,12,10,14, 9,13,11,15 };
1038
1039 /* the default colour table, for VGA+ colour systems */
1040 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1041 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1042 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1043 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1044 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1045 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1046
1047 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1048 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1049 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1050
1051 /*
1052 * gotoxy() must verify all boundaries, because the arguments
1053 * might also be negative. If the given position is out of
1054 * bounds, the cursor is placed at the nearest margin.
1055 */
1056 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1057 {
1058 int min_y, max_y;
1059
1060 if (new_x < 0)
1061 vc->vc_x = 0;
1062 else {
1063 if (new_x >= vc->vc_cols)
1064 vc->vc_x = vc->vc_cols - 1;
1065 else
1066 vc->vc_x = new_x;
1067 }
1068
1069 if (vc->vc_decom) {
1070 min_y = vc->vc_top;
1071 max_y = vc->vc_bottom;
1072 } else {
1073 min_y = 0;
1074 max_y = vc->vc_rows;
1075 }
1076 if (new_y < min_y)
1077 vc->vc_y = min_y;
1078 else if (new_y >= max_y)
1079 vc->vc_y = max_y - 1;
1080 else
1081 vc->vc_y = new_y;
1082 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1083 vc->vc_need_wrap = 0;
1084 }
1085
1086 /* for absolute user moves, when decom is set */
1087 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1088 {
1089 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1090 }
1091
1092 void scrollback(struct vc_data *vc, int lines)
1093 {
1094 if (!lines)
1095 lines = vc->vc_rows / 2;
1096 scrolldelta(-lines);
1097 }
1098
1099 void scrollfront(struct vc_data *vc, int lines)
1100 {
1101 if (!lines)
1102 lines = vc->vc_rows / 2;
1103 scrolldelta(lines);
1104 }
1105
1106 static void lf(struct vc_data *vc)
1107 {
1108 /* don't scroll if above bottom of scrolling region, or
1109 * if below scrolling region
1110 */
1111 if (vc->vc_y + 1 == vc->vc_bottom)
1112 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1113 else if (vc->vc_y < vc->vc_rows - 1) {
1114 vc->vc_y++;
1115 vc->vc_pos += vc->vc_size_row;
1116 }
1117 vc->vc_need_wrap = 0;
1118 notify_write(vc, '\n');
1119 }
1120
1121 static void ri(struct vc_data *vc)
1122 {
1123 /* don't scroll if below top of scrolling region, or
1124 * if above scrolling region
1125 */
1126 if (vc->vc_y == vc->vc_top)
1127 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1128 else if (vc->vc_y > 0) {
1129 vc->vc_y--;
1130 vc->vc_pos -= vc->vc_size_row;
1131 }
1132 vc->vc_need_wrap = 0;
1133 }
1134
1135 static inline void cr(struct vc_data *vc)
1136 {
1137 vc->vc_pos -= vc->vc_x << 1;
1138 vc->vc_need_wrap = vc->vc_x = 0;
1139 notify_write(vc, '\r');
1140 }
1141
1142 static inline void bs(struct vc_data *vc)
1143 {
1144 if (vc->vc_x) {
1145 vc->vc_pos -= 2;
1146 vc->vc_x--;
1147 vc->vc_need_wrap = 0;
1148 notify_write(vc, '\b');
1149 }
1150 }
1151
1152 static inline void del(struct vc_data *vc)
1153 {
1154 /* ignored */
1155 }
1156
1157 static void csi_J(struct vc_data *vc, int vpar)
1158 {
1159 unsigned int count;
1160 unsigned short * start;
1161
1162 switch (vpar) {
1163 case 0: /* erase from cursor to end of display */
1164 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1165 start = (unsigned short *)vc->vc_pos;
1166 if (DO_UPDATE(vc)) {
1167 /* do in two stages */
1168 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1169 vc->vc_cols - vc->vc_x);
1170 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1171 vc->vc_rows - vc->vc_y - 1,
1172 vc->vc_cols);
1173 }
1174 break;
1175 case 1: /* erase from start to cursor */
1176 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1177 start = (unsigned short *)vc->vc_origin;
1178 if (DO_UPDATE(vc)) {
1179 /* do in two stages */
1180 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1181 vc->vc_cols);
1182 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1183 vc->vc_x + 1);
1184 }
1185 break;
1186 case 2: /* erase whole display */
1187 count = vc->vc_cols * vc->vc_rows;
1188 start = (unsigned short *)vc->vc_origin;
1189 if (DO_UPDATE(vc))
1190 vc->vc_sw->con_clear(vc, 0, 0,
1191 vc->vc_rows,
1192 vc->vc_cols);
1193 break;
1194 default:
1195 return;
1196 }
1197 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1198 vc->vc_need_wrap = 0;
1199 }
1200
1201 static void csi_K(struct vc_data *vc, int vpar)
1202 {
1203 unsigned int count;
1204 unsigned short * start;
1205
1206 switch (vpar) {
1207 case 0: /* erase from cursor to end of line */
1208 count = vc->vc_cols - vc->vc_x;
1209 start = (unsigned short *)vc->vc_pos;
1210 if (DO_UPDATE(vc))
1211 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1212 vc->vc_cols - vc->vc_x);
1213 break;
1214 case 1: /* erase from start of line to cursor */
1215 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216 count = vc->vc_x + 1;
1217 if (DO_UPDATE(vc))
1218 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1219 vc->vc_x + 1);
1220 break;
1221 case 2: /* erase whole line */
1222 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1223 count = vc->vc_cols;
1224 if (DO_UPDATE(vc))
1225 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1226 vc->vc_cols);
1227 break;
1228 default:
1229 return;
1230 }
1231 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1232 vc->vc_need_wrap = 0;
1233 }
1234
1235 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1236 { /* not vt100? */
1237 int count;
1238
1239 if (!vpar)
1240 vpar++;
1241 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1242
1243 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1244 if (DO_UPDATE(vc))
1245 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1246 vc->vc_need_wrap = 0;
1247 }
1248
1249 static void default_attr(struct vc_data *vc)
1250 {
1251 vc->vc_intensity = 1;
1252 vc->vc_italic = 0;
1253 vc->vc_underline = 0;
1254 vc->vc_reverse = 0;
1255 vc->vc_blink = 0;
1256 vc->vc_color = vc->vc_def_color;
1257 }
1258
1259 /* console_sem is held */
1260 static void csi_m(struct vc_data *vc)
1261 {
1262 int i;
1263
1264 for (i = 0; i <= vc->vc_npar; i++)
1265 switch (vc->vc_par[i]) {
1266 case 0: /* all attributes off */
1267 default_attr(vc);
1268 break;
1269 case 1:
1270 vc->vc_intensity = 2;
1271 break;
1272 case 2:
1273 vc->vc_intensity = 0;
1274 break;
1275 case 3:
1276 vc->vc_italic = 1;
1277 break;
1278 case 4:
1279 vc->vc_underline = 1;
1280 break;
1281 case 5:
1282 vc->vc_blink = 1;
1283 break;
1284 case 7:
1285 vc->vc_reverse = 1;
1286 break;
1287 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1288 * Select primary font, don't display
1289 * control chars if defined, don't set
1290 * bit 8 on output.
1291 */
1292 vc->vc_translate = set_translate(vc->vc_charset == 0
1293 ? vc->vc_G0_charset
1294 : vc->vc_G1_charset, vc);
1295 vc->vc_disp_ctrl = 0;
1296 vc->vc_toggle_meta = 0;
1297 break;
1298 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1299 * Select first alternate font, lets
1300 * chars < 32 be displayed as ROM chars.
1301 */
1302 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1303 vc->vc_disp_ctrl = 1;
1304 vc->vc_toggle_meta = 0;
1305 break;
1306 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1307 * Select second alternate font, toggle
1308 * high bit before displaying as ROM char.
1309 */
1310 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1311 vc->vc_disp_ctrl = 1;
1312 vc->vc_toggle_meta = 1;
1313 break;
1314 case 21:
1315 case 22:
1316 vc->vc_intensity = 1;
1317 break;
1318 case 23:
1319 vc->vc_italic = 0;
1320 break;
1321 case 24:
1322 vc->vc_underline = 0;
1323 break;
1324 case 25:
1325 vc->vc_blink = 0;
1326 break;
1327 case 27:
1328 vc->vc_reverse = 0;
1329 break;
1330 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1331 * Enables underscore, white foreground
1332 * with white underscore (Linux - use
1333 * default foreground).
1334 */
1335 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1336 vc->vc_underline = 1;
1337 break;
1338 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1339 * Disable underline option.
1340 * Reset colour to default? It did this
1341 * before...
1342 */
1343 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1344 vc->vc_underline = 0;
1345 break;
1346 case 49:
1347 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1348 break;
1349 default:
1350 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1351 vc->vc_color = color_table[vc->vc_par[i] - 30]
1352 | (vc->vc_color & 0xf0);
1353 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1354 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1355 | (vc->vc_color & 0x0f);
1356 break;
1357 }
1358 update_attr(vc);
1359 }
1360
1361 static void respond_string(const char *p, struct tty_struct *tty)
1362 {
1363 while (*p) {
1364 tty_insert_flip_char(tty, *p, 0);
1365 p++;
1366 }
1367 con_schedule_flip(tty);
1368 }
1369
1370 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1371 {
1372 char buf[40];
1373
1374 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1375 respond_string(buf, tty);
1376 }
1377
1378 static inline void status_report(struct tty_struct *tty)
1379 {
1380 respond_string("\033[0n", tty); /* Terminal ok */
1381 }
1382
1383 static inline void respond_ID(struct tty_struct * tty)
1384 {
1385 respond_string(VT102ID, tty);
1386 }
1387
1388 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1389 {
1390 char buf[8];
1391
1392 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1393 (char)('!' + mry));
1394 respond_string(buf, tty);
1395 }
1396
1397 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1398 int mouse_reporting(void)
1399 {
1400 return vc_cons[fg_console].d->vc_report_mouse;
1401 }
1402
1403 /* console_sem is held */
1404 static void set_mode(struct vc_data *vc, int on_off)
1405 {
1406 int i;
1407
1408 for (i = 0; i <= vc->vc_npar; i++)
1409 if (vc->vc_ques) {
1410 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1411 case 1: /* Cursor keys send ^[Ox/^[[x */
1412 if (on_off)
1413 set_kbd(vc, decckm);
1414 else
1415 clr_kbd(vc, decckm);
1416 break;
1417 case 3: /* 80/132 mode switch unimplemented */
1418 vc->vc_deccolm = on_off;
1419 #if 0
1420 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1421 /* this alone does not suffice; some user mode
1422 utility has to change the hardware regs */
1423 #endif
1424 break;
1425 case 5: /* Inverted screen on/off */
1426 if (vc->vc_decscnm != on_off) {
1427 vc->vc_decscnm = on_off;
1428 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1429 update_attr(vc);
1430 }
1431 break;
1432 case 6: /* Origin relative/absolute */
1433 vc->vc_decom = on_off;
1434 gotoxay(vc, 0, 0);
1435 break;
1436 case 7: /* Autowrap on/off */
1437 vc->vc_decawm = on_off;
1438 break;
1439 case 8: /* Autorepeat on/off */
1440 if (on_off)
1441 set_kbd(vc, decarm);
1442 else
1443 clr_kbd(vc, decarm);
1444 break;
1445 case 9:
1446 vc->vc_report_mouse = on_off ? 1 : 0;
1447 break;
1448 case 25: /* Cursor on/off */
1449 vc->vc_deccm = on_off;
1450 break;
1451 case 1000:
1452 vc->vc_report_mouse = on_off ? 2 : 0;
1453 break;
1454 }
1455 } else {
1456 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1457 case 3: /* Monitor (display ctrls) */
1458 vc->vc_disp_ctrl = on_off;
1459 break;
1460 case 4: /* Insert Mode on/off */
1461 vc->vc_decim = on_off;
1462 break;
1463 case 20: /* Lf, Enter == CrLf/Lf */
1464 if (on_off)
1465 set_kbd(vc, lnm);
1466 else
1467 clr_kbd(vc, lnm);
1468 break;
1469 }
1470 }
1471 }
1472
1473 /* console_sem is held */
1474 static void setterm_command(struct vc_data *vc)
1475 {
1476 switch(vc->vc_par[0]) {
1477 case 1: /* set color for underline mode */
1478 if (vc->vc_can_do_color &&
1479 vc->vc_par[1] < 16) {
1480 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1481 if (vc->vc_underline)
1482 update_attr(vc);
1483 }
1484 break;
1485 case 2: /* set color for half intensity mode */
1486 if (vc->vc_can_do_color &&
1487 vc->vc_par[1] < 16) {
1488 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1489 if (vc->vc_intensity == 0)
1490 update_attr(vc);
1491 }
1492 break;
1493 case 8: /* store colors as defaults */
1494 vc->vc_def_color = vc->vc_attr;
1495 if (vc->vc_hi_font_mask == 0x100)
1496 vc->vc_def_color >>= 1;
1497 default_attr(vc);
1498 update_attr(vc);
1499 break;
1500 case 9: /* set blanking interval */
1501 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1502 poke_blanked_console();
1503 break;
1504 case 10: /* set bell frequency in Hz */
1505 if (vc->vc_npar >= 1)
1506 vc->vc_bell_pitch = vc->vc_par[1];
1507 else
1508 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1509 break;
1510 case 11: /* set bell duration in msec */
1511 if (vc->vc_npar >= 1)
1512 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1513 vc->vc_par[1] * HZ / 1000 : 0;
1514 else
1515 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1516 break;
1517 case 12: /* bring specified console to the front */
1518 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1519 set_console(vc->vc_par[1] - 1);
1520 break;
1521 case 13: /* unblank the screen */
1522 poke_blanked_console();
1523 break;
1524 case 14: /* set vesa powerdown interval */
1525 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1526 break;
1527 case 15: /* activate the previous console */
1528 set_console(last_console);
1529 break;
1530 }
1531 }
1532
1533 /* console_sem is held */
1534 static void csi_at(struct vc_data *vc, unsigned int nr)
1535 {
1536 if (nr > vc->vc_cols - vc->vc_x)
1537 nr = vc->vc_cols - vc->vc_x;
1538 else if (!nr)
1539 nr = 1;
1540 insert_char(vc, nr);
1541 }
1542
1543 /* console_sem is held */
1544 static void csi_L(struct vc_data *vc, unsigned int nr)
1545 {
1546 if (nr > vc->vc_rows - vc->vc_y)
1547 nr = vc->vc_rows - vc->vc_y;
1548 else if (!nr)
1549 nr = 1;
1550 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1551 vc->vc_need_wrap = 0;
1552 }
1553
1554 /* console_sem is held */
1555 static void csi_P(struct vc_data *vc, unsigned int nr)
1556 {
1557 if (nr > vc->vc_cols - vc->vc_x)
1558 nr = vc->vc_cols - vc->vc_x;
1559 else if (!nr)
1560 nr = 1;
1561 delete_char(vc, nr);
1562 }
1563
1564 /* console_sem is held */
1565 static void csi_M(struct vc_data *vc, unsigned int nr)
1566 {
1567 if (nr > vc->vc_rows - vc->vc_y)
1568 nr = vc->vc_rows - vc->vc_y;
1569 else if (!nr)
1570 nr=1;
1571 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1572 vc->vc_need_wrap = 0;
1573 }
1574
1575 /* console_sem is held (except via vc_init->reset_terminal */
1576 static void save_cur(struct vc_data *vc)
1577 {
1578 vc->vc_saved_x = vc->vc_x;
1579 vc->vc_saved_y = vc->vc_y;
1580 vc->vc_s_intensity = vc->vc_intensity;
1581 vc->vc_s_italic = vc->vc_italic;
1582 vc->vc_s_underline = vc->vc_underline;
1583 vc->vc_s_blink = vc->vc_blink;
1584 vc->vc_s_reverse = vc->vc_reverse;
1585 vc->vc_s_charset = vc->vc_charset;
1586 vc->vc_s_color = vc->vc_color;
1587 vc->vc_saved_G0 = vc->vc_G0_charset;
1588 vc->vc_saved_G1 = vc->vc_G1_charset;
1589 }
1590
1591 /* console_sem is held */
1592 static void restore_cur(struct vc_data *vc)
1593 {
1594 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1595 vc->vc_intensity = vc->vc_s_intensity;
1596 vc->vc_italic = vc->vc_s_italic;
1597 vc->vc_underline = vc->vc_s_underline;
1598 vc->vc_blink = vc->vc_s_blink;
1599 vc->vc_reverse = vc->vc_s_reverse;
1600 vc->vc_charset = vc->vc_s_charset;
1601 vc->vc_color = vc->vc_s_color;
1602 vc->vc_G0_charset = vc->vc_saved_G0;
1603 vc->vc_G1_charset = vc->vc_saved_G1;
1604 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1605 update_attr(vc);
1606 vc->vc_need_wrap = 0;
1607 }
1608
1609 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1610 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1611 ESpalette };
1612
1613 /* console_sem is held (except via vc_init()) */
1614 static void reset_terminal(struct vc_data *vc, int do_clear)
1615 {
1616 vc->vc_top = 0;
1617 vc->vc_bottom = vc->vc_rows;
1618 vc->vc_state = ESnormal;
1619 vc->vc_ques = 0;
1620 vc->vc_translate = set_translate(LAT1_MAP, vc);
1621 vc->vc_G0_charset = LAT1_MAP;
1622 vc->vc_G1_charset = GRAF_MAP;
1623 vc->vc_charset = 0;
1624 vc->vc_need_wrap = 0;
1625 vc->vc_report_mouse = 0;
1626 vc->vc_utf = default_utf8;
1627 vc->vc_utf_count = 0;
1628
1629 vc->vc_disp_ctrl = 0;
1630 vc->vc_toggle_meta = 0;
1631
1632 vc->vc_decscnm = 0;
1633 vc->vc_decom = 0;
1634 vc->vc_decawm = 1;
1635 vc->vc_deccm = global_cursor_default;
1636 vc->vc_decim = 0;
1637
1638 set_kbd(vc, decarm);
1639 clr_kbd(vc, decckm);
1640 clr_kbd(vc, kbdapplic);
1641 clr_kbd(vc, lnm);
1642 kbd_table[vc->vc_num].lockstate = 0;
1643 kbd_table[vc->vc_num].slockstate = 0;
1644 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1645 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1646 /* do not do set_leds here because this causes an endless tasklet loop
1647 when the keyboard hasn't been initialized yet */
1648
1649 vc->vc_cursor_type = cur_default;
1650 vc->vc_complement_mask = vc->vc_s_complement_mask;
1651
1652 default_attr(vc);
1653 update_attr(vc);
1654
1655 vc->vc_tab_stop[0] = 0x01010100;
1656 vc->vc_tab_stop[1] =
1657 vc->vc_tab_stop[2] =
1658 vc->vc_tab_stop[3] =
1659 vc->vc_tab_stop[4] =
1660 vc->vc_tab_stop[5] =
1661 vc->vc_tab_stop[6] =
1662 vc->vc_tab_stop[7] = 0x01010101;
1663
1664 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1665 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1666
1667 gotoxy(vc, 0, 0);
1668 save_cur(vc);
1669 if (do_clear)
1670 csi_J(vc, 2);
1671 }
1672
1673 /* console_sem is held */
1674 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1675 {
1676 /*
1677 * Control characters can be used in the _middle_
1678 * of an escape sequence.
1679 */
1680 switch (c) {
1681 case 0:
1682 return;
1683 case 7:
1684 if (vc->vc_bell_duration)
1685 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1686 return;
1687 case 8:
1688 bs(vc);
1689 return;
1690 case 9:
1691 vc->vc_pos -= (vc->vc_x << 1);
1692 while (vc->vc_x < vc->vc_cols - 1) {
1693 vc->vc_x++;
1694 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1695 break;
1696 }
1697 vc->vc_pos += (vc->vc_x << 1);
1698 notify_write(vc, '\t');
1699 return;
1700 case 10: case 11: case 12:
1701 lf(vc);
1702 if (!is_kbd(vc, lnm))
1703 return;
1704 case 13:
1705 cr(vc);
1706 return;
1707 case 14:
1708 vc->vc_charset = 1;
1709 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1710 vc->vc_disp_ctrl = 1;
1711 return;
1712 case 15:
1713 vc->vc_charset = 0;
1714 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1715 vc->vc_disp_ctrl = 0;
1716 return;
1717 case 24: case 26:
1718 vc->vc_state = ESnormal;
1719 return;
1720 case 27:
1721 vc->vc_state = ESesc;
1722 return;
1723 case 127:
1724 del(vc);
1725 return;
1726 case 128+27:
1727 vc->vc_state = ESsquare;
1728 return;
1729 }
1730 switch(vc->vc_state) {
1731 case ESesc:
1732 vc->vc_state = ESnormal;
1733 switch (c) {
1734 case '[':
1735 vc->vc_state = ESsquare;
1736 return;
1737 case ']':
1738 vc->vc_state = ESnonstd;
1739 return;
1740 case '%':
1741 vc->vc_state = ESpercent;
1742 return;
1743 case 'E':
1744 cr(vc);
1745 lf(vc);
1746 return;
1747 case 'M':
1748 ri(vc);
1749 return;
1750 case 'D':
1751 lf(vc);
1752 return;
1753 case 'H':
1754 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1755 return;
1756 case 'Z':
1757 respond_ID(tty);
1758 return;
1759 case '7':
1760 save_cur(vc);
1761 return;
1762 case '8':
1763 restore_cur(vc);
1764 return;
1765 case '(':
1766 vc->vc_state = ESsetG0;
1767 return;
1768 case ')':
1769 vc->vc_state = ESsetG1;
1770 return;
1771 case '#':
1772 vc->vc_state = EShash;
1773 return;
1774 case 'c':
1775 reset_terminal(vc, 1);
1776 return;
1777 case '>': /* Numeric keypad */
1778 clr_kbd(vc, kbdapplic);
1779 return;
1780 case '=': /* Appl. keypad */
1781 set_kbd(vc, kbdapplic);
1782 return;
1783 }
1784 return;
1785 case ESnonstd:
1786 if (c=='P') { /* palette escape sequence */
1787 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1788 vc->vc_par[vc->vc_npar] = 0;
1789 vc->vc_npar = 0;
1790 vc->vc_state = ESpalette;
1791 return;
1792 } else if (c=='R') { /* reset palette */
1793 reset_palette(vc);
1794 vc->vc_state = ESnormal;
1795 } else
1796 vc->vc_state = ESnormal;
1797 return;
1798 case ESpalette:
1799 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1800 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1801 if (vc->vc_npar == 7) {
1802 int i = vc->vc_par[0] * 3, j = 1;
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 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1808 vc->vc_palette[i] += vc->vc_par[j];
1809 set_palette(vc);
1810 vc->vc_state = ESnormal;
1811 }
1812 } else
1813 vc->vc_state = ESnormal;
1814 return;
1815 case ESsquare:
1816 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1817 vc->vc_par[vc->vc_npar] = 0;
1818 vc->vc_npar = 0;
1819 vc->vc_state = ESgetpars;
1820 if (c == '[') { /* Function key */
1821 vc->vc_state=ESfunckey;
1822 return;
1823 }
1824 vc->vc_ques = (c == '?');
1825 if (vc->vc_ques)
1826 return;
1827 case ESgetpars:
1828 if (c == ';' && vc->vc_npar < NPAR - 1) {
1829 vc->vc_npar++;
1830 return;
1831 } else if (c>='0' && c<='9') {
1832 vc->vc_par[vc->vc_npar] *= 10;
1833 vc->vc_par[vc->vc_npar] += c - '0';
1834 return;
1835 } else
1836 vc->vc_state = ESgotpars;
1837 case ESgotpars:
1838 vc->vc_state = ESnormal;
1839 switch(c) {
1840 case 'h':
1841 set_mode(vc, 1);
1842 return;
1843 case 'l':
1844 set_mode(vc, 0);
1845 return;
1846 case 'c':
1847 if (vc->vc_ques) {
1848 if (vc->vc_par[0])
1849 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1850 else
1851 vc->vc_cursor_type = cur_default;
1852 return;
1853 }
1854 break;
1855 case 'm':
1856 if (vc->vc_ques) {
1857 clear_selection();
1858 if (vc->vc_par[0])
1859 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1860 else
1861 vc->vc_complement_mask = vc->vc_s_complement_mask;
1862 return;
1863 }
1864 break;
1865 case 'n':
1866 if (!vc->vc_ques) {
1867 if (vc->vc_par[0] == 5)
1868 status_report(tty);
1869 else if (vc->vc_par[0] == 6)
1870 cursor_report(vc, tty);
1871 }
1872 return;
1873 }
1874 if (vc->vc_ques) {
1875 vc->vc_ques = 0;
1876 return;
1877 }
1878 switch(c) {
1879 case 'G': case '`':
1880 if (vc->vc_par[0])
1881 vc->vc_par[0]--;
1882 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1883 return;
1884 case 'A':
1885 if (!vc->vc_par[0])
1886 vc->vc_par[0]++;
1887 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1888 return;
1889 case 'B': case 'e':
1890 if (!vc->vc_par[0])
1891 vc->vc_par[0]++;
1892 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1893 return;
1894 case 'C': case 'a':
1895 if (!vc->vc_par[0])
1896 vc->vc_par[0]++;
1897 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1898 return;
1899 case 'D':
1900 if (!vc->vc_par[0])
1901 vc->vc_par[0]++;
1902 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1903 return;
1904 case 'E':
1905 if (!vc->vc_par[0])
1906 vc->vc_par[0]++;
1907 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1908 return;
1909 case 'F':
1910 if (!vc->vc_par[0])
1911 vc->vc_par[0]++;
1912 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1913 return;
1914 case 'd':
1915 if (vc->vc_par[0])
1916 vc->vc_par[0]--;
1917 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1918 return;
1919 case 'H': case 'f':
1920 if (vc->vc_par[0])
1921 vc->vc_par[0]--;
1922 if (vc->vc_par[1])
1923 vc->vc_par[1]--;
1924 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1925 return;
1926 case 'J':
1927 csi_J(vc, vc->vc_par[0]);
1928 return;
1929 case 'K':
1930 csi_K(vc, vc->vc_par[0]);
1931 return;
1932 case 'L':
1933 csi_L(vc, vc->vc_par[0]);
1934 return;
1935 case 'M':
1936 csi_M(vc, vc->vc_par[0]);
1937 return;
1938 case 'P':
1939 csi_P(vc, vc->vc_par[0]);
1940 return;
1941 case 'c':
1942 if (!vc->vc_par[0])
1943 respond_ID(tty);
1944 return;
1945 case 'g':
1946 if (!vc->vc_par[0])
1947 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1948 else if (vc->vc_par[0] == 3) {
1949 vc->vc_tab_stop[0] =
1950 vc->vc_tab_stop[1] =
1951 vc->vc_tab_stop[2] =
1952 vc->vc_tab_stop[3] =
1953 vc->vc_tab_stop[4] =
1954 vc->vc_tab_stop[5] =
1955 vc->vc_tab_stop[6] =
1956 vc->vc_tab_stop[7] = 0;
1957 }
1958 return;
1959 case 'm':
1960 csi_m(vc);
1961 return;
1962 case 'q': /* DECLL - but only 3 leds */
1963 /* map 0,1,2,3 to 0,1,2,4 */
1964 if (vc->vc_par[0] < 4)
1965 setledstate(kbd_table + vc->vc_num,
1966 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1967 return;
1968 case 'r':
1969 if (!vc->vc_par[0])
1970 vc->vc_par[0]++;
1971 if (!vc->vc_par[1])
1972 vc->vc_par[1] = vc->vc_rows;
1973 /* Minimum allowed region is 2 lines */
1974 if (vc->vc_par[0] < vc->vc_par[1] &&
1975 vc->vc_par[1] <= vc->vc_rows) {
1976 vc->vc_top = vc->vc_par[0] - 1;
1977 vc->vc_bottom = vc->vc_par[1];
1978 gotoxay(vc, 0, 0);
1979 }
1980 return;
1981 case 's':
1982 save_cur(vc);
1983 return;
1984 case 'u':
1985 restore_cur(vc);
1986 return;
1987 case 'X':
1988 csi_X(vc, vc->vc_par[0]);
1989 return;
1990 case '@':
1991 csi_at(vc, vc->vc_par[0]);
1992 return;
1993 case ']': /* setterm functions */
1994 setterm_command(vc);
1995 return;
1996 }
1997 return;
1998 case ESpercent:
1999 vc->vc_state = ESnormal;
2000 switch (c) {
2001 case '@': /* defined in ISO 2022 */
2002 vc->vc_utf = 0;
2003 return;
2004 case 'G': /* prelim official escape code */
2005 case '8': /* retained for compatibility */
2006 vc->vc_utf = 1;
2007 return;
2008 }
2009 return;
2010 case ESfunckey:
2011 vc->vc_state = ESnormal;
2012 return;
2013 case EShash:
2014 vc->vc_state = ESnormal;
2015 if (c == '8') {
2016 /* DEC screen alignment test. kludge :-) */
2017 vc->vc_video_erase_char =
2018 (vc->vc_video_erase_char & 0xff00) | 'E';
2019 csi_J(vc, 2);
2020 vc->vc_video_erase_char =
2021 (vc->vc_video_erase_char & 0xff00) | ' ';
2022 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2023 }
2024 return;
2025 case ESsetG0:
2026 if (c == '0')
2027 vc->vc_G0_charset = GRAF_MAP;
2028 else if (c == 'B')
2029 vc->vc_G0_charset = LAT1_MAP;
2030 else if (c == 'U')
2031 vc->vc_G0_charset = IBMPC_MAP;
2032 else if (c == 'K')
2033 vc->vc_G0_charset = USER_MAP;
2034 if (vc->vc_charset == 0)
2035 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2036 vc->vc_state = ESnormal;
2037 return;
2038 case ESsetG1:
2039 if (c == '0')
2040 vc->vc_G1_charset = GRAF_MAP;
2041 else if (c == 'B')
2042 vc->vc_G1_charset = LAT1_MAP;
2043 else if (c == 'U')
2044 vc->vc_G1_charset = IBMPC_MAP;
2045 else if (c == 'K')
2046 vc->vc_G1_charset = USER_MAP;
2047 if (vc->vc_charset == 1)
2048 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2049 vc->vc_state = ESnormal;
2050 return;
2051 default:
2052 vc->vc_state = ESnormal;
2053 }
2054 }
2055
2056 /* This is a temporary buffer used to prepare a tty console write
2057 * so that we can easily avoid touching user space while holding the
2058 * console spinlock. It is allocated in con_init and is shared by
2059 * this code and the vc_screen read/write tty calls.
2060 *
2061 * We have to allocate this statically in the kernel data section
2062 * since console_init (and thus con_init) are called before any
2063 * kernel memory allocation is available.
2064 */
2065 char con_buf[CON_BUF_SIZE];
2066 DEFINE_MUTEX(con_buf_mtx);
2067
2068 /* is_double_width() is based on the wcwidth() implementation by
2069 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2070 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2071 */
2072 struct interval {
2073 uint32_t first;
2074 uint32_t last;
2075 };
2076
2077 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2078 {
2079 int min = 0;
2080 int mid;
2081
2082 if (ucs < table[0].first || ucs > table[max].last)
2083 return 0;
2084 while (max >= min) {
2085 mid = (min + max) / 2;
2086 if (ucs > table[mid].last)
2087 min = mid + 1;
2088 else if (ucs < table[mid].first)
2089 max = mid - 1;
2090 else
2091 return 1;
2092 }
2093 return 0;
2094 }
2095
2096 static int is_double_width(uint32_t ucs)
2097 {
2098 static const struct interval double_width[] = {
2099 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2100 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2101 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2102 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2103 };
2104 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2105 }
2106
2107 /* acquires console_sem */
2108 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2109 {
2110 #ifdef VT_BUF_VRAM_ONLY
2111 #define FLUSH do { } while(0);
2112 #else
2113 #define FLUSH if (draw_x >= 0) { \
2114 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2115 draw_x = -1; \
2116 }
2117 #endif
2118
2119 int c, tc, ok, n = 0, draw_x = -1;
2120 unsigned int currcons;
2121 unsigned long draw_from = 0, draw_to = 0;
2122 struct vc_data *vc;
2123 unsigned char vc_attr;
2124 struct vt_notifier_param param;
2125 uint8_t rescan;
2126 uint8_t inverse;
2127 uint8_t width;
2128 u16 himask, charmask;
2129
2130 if (in_interrupt())
2131 return count;
2132
2133 might_sleep();
2134
2135 acquire_console_sem();
2136 vc = tty->driver_data;
2137 if (vc == NULL) {
2138 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2139 release_console_sem();
2140 return 0;
2141 }
2142
2143 currcons = vc->vc_num;
2144 if (!vc_cons_allocated(currcons)) {
2145 /* could this happen? */
2146 printk_once("con_write: tty %d not allocated\n", currcons+1);
2147 release_console_sem();
2148 return 0;
2149 }
2150
2151 himask = vc->vc_hi_font_mask;
2152 charmask = himask ? 0x1ff : 0xff;
2153
2154 /* undraw cursor first */
2155 if (IS_FG(vc))
2156 hide_cursor(vc);
2157
2158 param.vc = vc;
2159
2160 while (!tty->stopped && count) {
2161 int orig = *buf;
2162 c = orig;
2163 buf++;
2164 n++;
2165 count--;
2166 rescan = 0;
2167 inverse = 0;
2168 width = 1;
2169
2170 /* Do no translation at all in control states */
2171 if (vc->vc_state != ESnormal) {
2172 tc = c;
2173 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2174 /* Combine UTF-8 into Unicode in vc_utf_char.
2175 * vc_utf_count is the number of continuation bytes still
2176 * expected to arrive.
2177 * vc_npar is the number of continuation bytes arrived so
2178 * far
2179 */
2180 rescan_last_byte:
2181 if ((c & 0xc0) == 0x80) {
2182 /* Continuation byte received */
2183 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2184 if (vc->vc_utf_count) {
2185 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2186 vc->vc_npar++;
2187 if (--vc->vc_utf_count) {
2188 /* Still need some bytes */
2189 continue;
2190 }
2191 /* Got a whole character */
2192 c = vc->vc_utf_char;
2193 /* Reject overlong sequences */
2194 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2195 c > utf8_length_changes[vc->vc_npar])
2196 c = 0xfffd;
2197 } else {
2198 /* Unexpected continuation byte */
2199 vc->vc_utf_count = 0;
2200 c = 0xfffd;
2201 }
2202 } else {
2203 /* Single ASCII byte or first byte of a sequence received */
2204 if (vc->vc_utf_count) {
2205 /* Continuation byte expected */
2206 rescan = 1;
2207 vc->vc_utf_count = 0;
2208 c = 0xfffd;
2209 } else if (c > 0x7f) {
2210 /* First byte of a multibyte sequence received */
2211 vc->vc_npar = 0;
2212 if ((c & 0xe0) == 0xc0) {
2213 vc->vc_utf_count = 1;
2214 vc->vc_utf_char = (c & 0x1f);
2215 } else if ((c & 0xf0) == 0xe0) {
2216 vc->vc_utf_count = 2;
2217 vc->vc_utf_char = (c & 0x0f);
2218 } else if ((c & 0xf8) == 0xf0) {
2219 vc->vc_utf_count = 3;
2220 vc->vc_utf_char = (c & 0x07);
2221 } else if ((c & 0xfc) == 0xf8) {
2222 vc->vc_utf_count = 4;
2223 vc->vc_utf_char = (c & 0x03);
2224 } else if ((c & 0xfe) == 0xfc) {
2225 vc->vc_utf_count = 5;
2226 vc->vc_utf_char = (c & 0x01);
2227 } else {
2228 /* 254 and 255 are invalid */
2229 c = 0xfffd;
2230 }
2231 if (vc->vc_utf_count) {
2232 /* Still need some bytes */
2233 continue;
2234 }
2235 }
2236 /* Nothing to do if an ASCII byte was received */
2237 }
2238 /* End of UTF-8 decoding. */
2239 /* c is the received character, or U+FFFD for invalid sequences. */
2240 /* Replace invalid Unicode code points with U+FFFD too */
2241 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2242 c = 0xfffd;
2243 tc = c;
2244 } else { /* no utf or alternate charset mode */
2245 tc = vc_translate(vc, c);
2246 }
2247
2248 param.c = tc;
2249 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2250 &param) == NOTIFY_STOP)
2251 continue;
2252
2253 /* If the original code was a control character we
2254 * only allow a glyph to be displayed if the code is
2255 * not normally used (such as for cursor movement) or
2256 * if the disp_ctrl mode has been explicitly enabled.
2257 * Certain characters (as given by the CTRL_ALWAYS
2258 * bitmap) are always displayed as control characters,
2259 * as the console would be pretty useless without
2260 * them; to display an arbitrary font position use the
2261 * direct-to-font zone in UTF-8 mode.
2262 */
2263 ok = tc && (c >= 32 ||
2264 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2265 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2266 && (c != 127 || vc->vc_disp_ctrl)
2267 && (c != 128+27);
2268
2269 if (vc->vc_state == ESnormal && ok) {
2270 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2271 if (is_double_width(c))
2272 width = 2;
2273 }
2274 /* Now try to find out how to display it */
2275 tc = conv_uni_to_pc(vc, tc);
2276 if (tc & ~charmask) {
2277 if (tc == -1 || tc == -2) {
2278 continue; /* nothing to display */
2279 }
2280 /* Glyph not found */
2281 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2282 /* In legacy mode use the glyph we get by a 1:1 mapping.
2283 This would make absolutely no sense with Unicode in mind,
2284 but do this for ASCII characters since a font may lack
2285 Unicode mapping info and we don't want to end up with
2286 having question marks only. */
2287 tc = c;
2288 } else {
2289 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2290 tc = conv_uni_to_pc(vc, 0xfffd);
2291 if (tc < 0) {
2292 inverse = 1;
2293 tc = conv_uni_to_pc(vc, '?');
2294 if (tc < 0) tc = '?';
2295 }
2296 }
2297 }
2298
2299 if (!inverse) {
2300 vc_attr = vc->vc_attr;
2301 } else {
2302 /* invert vc_attr */
2303 if (!vc->vc_can_do_color) {
2304 vc_attr = (vc->vc_attr) ^ 0x08;
2305 } else if (vc->vc_hi_font_mask == 0x100) {
2306 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2307 } else {
2308 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2309 }
2310 FLUSH
2311 }
2312
2313 while (1) {
2314 if (vc->vc_need_wrap || vc->vc_decim)
2315 FLUSH
2316 if (vc->vc_need_wrap) {
2317 cr(vc);
2318 lf(vc);
2319 }
2320 if (vc->vc_decim)
2321 insert_char(vc, 1);
2322 scr_writew(himask ?
2323 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2324 (vc_attr << 8) + tc,
2325 (u16 *) vc->vc_pos);
2326 if (DO_UPDATE(vc) && draw_x < 0) {
2327 draw_x = vc->vc_x;
2328 draw_from = vc->vc_pos;
2329 }
2330 if (vc->vc_x == vc->vc_cols - 1) {
2331 vc->vc_need_wrap = vc->vc_decawm;
2332 draw_to = vc->vc_pos + 2;
2333 } else {
2334 vc->vc_x++;
2335 draw_to = (vc->vc_pos += 2);
2336 }
2337
2338 if (!--width) break;
2339
2340 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2341 if (tc < 0) tc = ' ';
2342 }
2343 notify_write(vc, c);
2344
2345 if (inverse) {
2346 FLUSH
2347 }
2348
2349 if (rescan) {
2350 rescan = 0;
2351 inverse = 0;
2352 width = 1;
2353 c = orig;
2354 goto rescan_last_byte;
2355 }
2356 continue;
2357 }
2358 FLUSH
2359 do_con_trol(tty, vc, orig);
2360 }
2361 FLUSH
2362 console_conditional_schedule();
2363 release_console_sem();
2364 notify_update(vc);
2365 return n;
2366 #undef FLUSH
2367 }
2368
2369 /*
2370 * This is the console switching callback.
2371 *
2372 * Doing console switching in a process context allows
2373 * us to do the switches asynchronously (needed when we want
2374 * to switch due to a keyboard interrupt). Synchronization
2375 * with other console code and prevention of re-entrancy is
2376 * ensured with console_sem.
2377 */
2378 static void console_callback(struct work_struct *ignored)
2379 {
2380 acquire_console_sem();
2381
2382 if (want_console >= 0) {
2383 if (want_console != fg_console &&
2384 vc_cons_allocated(want_console)) {
2385 hide_cursor(vc_cons[fg_console].d);
2386 change_console(vc_cons[want_console].d);
2387 /* we only changed when the console had already
2388 been allocated - a new console is not created
2389 in an interrupt routine */
2390 }
2391 want_console = -1;
2392 }
2393 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2394 do_poke_blanked_console = 0;
2395 poke_blanked_console();
2396 }
2397 if (scrollback_delta) {
2398 struct vc_data *vc = vc_cons[fg_console].d;
2399 clear_selection();
2400 if (vc->vc_mode == KD_TEXT)
2401 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2402 scrollback_delta = 0;
2403 }
2404 if (blank_timer_expired) {
2405 do_blank_screen(0);
2406 blank_timer_expired = 0;
2407 }
2408 notify_update(vc_cons[fg_console].d);
2409
2410 release_console_sem();
2411 }
2412
2413 int set_console(int nr)
2414 {
2415 struct vc_data *vc = vc_cons[fg_console].d;
2416
2417 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2418 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2419
2420 /*
2421 * Console switch will fail in console_callback() or
2422 * change_console() so there is no point scheduling
2423 * the callback
2424 *
2425 * Existing set_console() users don't check the return
2426 * value so this shouldn't break anything
2427 */
2428 return -EINVAL;
2429 }
2430
2431 want_console = nr;
2432 schedule_console_callback();
2433
2434 return 0;
2435 }
2436
2437 struct tty_driver *console_driver;
2438
2439 #ifdef CONFIG_VT_CONSOLE
2440
2441 /**
2442 * vt_kmsg_redirect() - Sets/gets the kernel message console
2443 * @new: The new virtual terminal number or -1 if the console should stay
2444 * unchanged
2445 *
2446 * By default, the kernel messages are always printed on the current virtual
2447 * console. However, the user may modify that default with the
2448 * TIOCL_SETKMSGREDIRECT ioctl call.
2449 *
2450 * This function sets the kernel message console to be @new. It returns the old
2451 * virtual console number. The virtual terminal number 0 (both as parameter and
2452 * return value) means no redirection (i.e. always printed on the currently
2453 * active console).
2454 *
2455 * The parameter -1 means that only the current console is returned, but the
2456 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2457 * case to make the code more understandable.
2458 *
2459 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2460 * the parameter and always returns 0.
2461 */
2462 int vt_kmsg_redirect(int new)
2463 {
2464 static int kmsg_con;
2465
2466 if (new != -1)
2467 return xchg(&kmsg_con, new);
2468 else
2469 return kmsg_con;
2470 }
2471
2472 /*
2473 * Console on virtual terminal
2474 *
2475 * The console must be locked when we get here.
2476 */
2477
2478 static void vt_console_print(struct console *co, const char *b, unsigned count)
2479 {
2480 struct vc_data *vc = vc_cons[fg_console].d;
2481 unsigned char c;
2482 static DEFINE_SPINLOCK(printing_lock);
2483 const ushort *start;
2484 ushort cnt = 0;
2485 ushort myx;
2486 int kmsg_console;
2487
2488 /* console busy or not yet initialized */
2489 if (!printable)
2490 return;
2491 if (!spin_trylock(&printing_lock))
2492 return;
2493
2494 kmsg_console = vt_get_kmsg_redirect();
2495 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2496 vc = vc_cons[kmsg_console - 1].d;
2497
2498 /* read `x' only after setting currcons properly (otherwise
2499 the `x' macro will read the x of the foreground console). */
2500 myx = vc->vc_x;
2501
2502 if (!vc_cons_allocated(fg_console)) {
2503 /* impossible */
2504 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2505 goto quit;
2506 }
2507
2508 if (vc->vc_mode != KD_TEXT)
2509 goto quit;
2510
2511 /* undraw cursor first */
2512 if (IS_FG(vc))
2513 hide_cursor(vc);
2514
2515 start = (ushort *)vc->vc_pos;
2516
2517 /* Contrived structure to try to emulate original need_wrap behaviour
2518 * Problems caused when we have need_wrap set on '\n' character */
2519 while (count--) {
2520 c = *b++;
2521 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2522 if (cnt > 0) {
2523 if (CON_IS_VISIBLE(vc))
2524 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2525 vc->vc_x += cnt;
2526 if (vc->vc_need_wrap)
2527 vc->vc_x--;
2528 cnt = 0;
2529 }
2530 if (c == 8) { /* backspace */
2531 bs(vc);
2532 start = (ushort *)vc->vc_pos;
2533 myx = vc->vc_x;
2534 continue;
2535 }
2536 if (c != 13)
2537 lf(vc);
2538 cr(vc);
2539 start = (ushort *)vc->vc_pos;
2540 myx = vc->vc_x;
2541 if (c == 10 || c == 13)
2542 continue;
2543 }
2544 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2545 notify_write(vc, c);
2546 cnt++;
2547 if (myx == vc->vc_cols - 1) {
2548 vc->vc_need_wrap = 1;
2549 continue;
2550 }
2551 vc->vc_pos += 2;
2552 myx++;
2553 }
2554 if (cnt > 0) {
2555 if (CON_IS_VISIBLE(vc))
2556 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2557 vc->vc_x += cnt;
2558 if (vc->vc_x == vc->vc_cols) {
2559 vc->vc_x--;
2560 vc->vc_need_wrap = 1;
2561 }
2562 }
2563 set_cursor(vc);
2564 notify_update(vc);
2565
2566 quit:
2567 spin_unlock(&printing_lock);
2568 }
2569
2570 static struct tty_driver *vt_console_device(struct console *c, int *index)
2571 {
2572 *index = c->index ? c->index-1 : fg_console;
2573 return console_driver;
2574 }
2575
2576 static struct console vt_console_driver = {
2577 .name = "tty",
2578 .write = vt_console_print,
2579 .device = vt_console_device,
2580 .unblank = unblank_screen,
2581 .flags = CON_PRINTBUFFER,
2582 .index = -1,
2583 };
2584 #endif
2585
2586 /*
2587 * Handling of Linux-specific VC ioctls
2588 */
2589
2590 /*
2591 * Generally a bit racy with respect to console_sem().
2592 *
2593 * There are some functions which don't need it.
2594 *
2595 * There are some functions which can sleep for arbitrary periods
2596 * (paste_selection) but we don't need the lock there anyway.
2597 *
2598 * set_selection has locking, and definitely needs it
2599 */
2600
2601 int tioclinux(struct tty_struct *tty, unsigned long arg)
2602 {
2603 char type, data;
2604 char __user *p = (char __user *)arg;
2605 int lines;
2606 int ret;
2607
2608 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2609 return -EPERM;
2610 if (get_user(type, p))
2611 return -EFAULT;
2612 ret = 0;
2613
2614 lock_kernel();
2615
2616 switch (type)
2617 {
2618 case TIOCL_SETSEL:
2619 acquire_console_sem();
2620 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2621 release_console_sem();
2622 break;
2623 case TIOCL_PASTESEL:
2624 ret = paste_selection(tty);
2625 break;
2626 case TIOCL_UNBLANKSCREEN:
2627 acquire_console_sem();
2628 unblank_screen();
2629 release_console_sem();
2630 break;
2631 case TIOCL_SELLOADLUT:
2632 ret = sel_loadlut(p);
2633 break;
2634 case TIOCL_GETSHIFTSTATE:
2635
2636 /*
2637 * Make it possible to react to Shift+Mousebutton.
2638 * Note that 'shift_state' is an undocumented
2639 * kernel-internal variable; programs not closely
2640 * related to the kernel should not use this.
2641 */
2642 data = shift_state;
2643 ret = __put_user(data, p);
2644 break;
2645 case TIOCL_GETMOUSEREPORTING:
2646 data = mouse_reporting();
2647 ret = __put_user(data, p);
2648 break;
2649 case TIOCL_SETVESABLANK:
2650 ret = set_vesa_blanking(p);
2651 break;
2652 case TIOCL_GETKMSGREDIRECT:
2653 data = vt_get_kmsg_redirect();
2654 ret = __put_user(data, p);
2655 break;
2656 case TIOCL_SETKMSGREDIRECT:
2657 if (!capable(CAP_SYS_ADMIN)) {
2658 ret = -EPERM;
2659 } else {
2660 if (get_user(data, p+1))
2661 ret = -EFAULT;
2662 else
2663 vt_kmsg_redirect(data);
2664 }
2665 break;
2666 case TIOCL_GETFGCONSOLE:
2667 ret = fg_console;
2668 break;
2669 case TIOCL_SCROLLCONSOLE:
2670 if (get_user(lines, (s32 __user *)(p+4))) {
2671 ret = -EFAULT;
2672 } else {
2673 scrollfront(vc_cons[fg_console].d, lines);
2674 ret = 0;
2675 }
2676 break;
2677 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2678 acquire_console_sem();
2679 ignore_poke = 1;
2680 do_blank_screen(0);
2681 release_console_sem();
2682 break;
2683 case TIOCL_BLANKEDSCREEN:
2684 ret = console_blanked;
2685 break;
2686 default:
2687 ret = -EINVAL;
2688 break;
2689 }
2690 unlock_kernel();
2691 return ret;
2692 }
2693
2694 /*
2695 * /dev/ttyN handling
2696 */
2697
2698 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2699 {
2700 int retval;
2701
2702 retval = do_con_write(tty, buf, count);
2703 con_flush_chars(tty);
2704
2705 return retval;
2706 }
2707
2708 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2709 {
2710 if (in_interrupt())
2711 return 0; /* n_r3964 calls put_char() from interrupt context */
2712 return do_con_write(tty, &ch, 1);
2713 }
2714
2715 static int con_write_room(struct tty_struct *tty)
2716 {
2717 if (tty->stopped)
2718 return 0;
2719 return 32768; /* No limit, really; we're not buffering */
2720 }
2721
2722 static int con_chars_in_buffer(struct tty_struct *tty)
2723 {
2724 return 0; /* we're not buffering */
2725 }
2726
2727 /*
2728 * con_throttle and con_unthrottle are only used for
2729 * paste_selection(), which has to stuff in a large number of
2730 * characters...
2731 */
2732 static void con_throttle(struct tty_struct *tty)
2733 {
2734 }
2735
2736 static void con_unthrottle(struct tty_struct *tty)
2737 {
2738 struct vc_data *vc = tty->driver_data;
2739
2740 wake_up_interruptible(&vc->paste_wait);
2741 }
2742
2743 /*
2744 * Turn the Scroll-Lock LED on when the tty is stopped
2745 */
2746 static void con_stop(struct tty_struct *tty)
2747 {
2748 int console_num;
2749 if (!tty)
2750 return;
2751 console_num = tty->index;
2752 if (!vc_cons_allocated(console_num))
2753 return;
2754 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2755 set_leds();
2756 }
2757
2758 /*
2759 * Turn the Scroll-Lock LED off when the console is started
2760 */
2761 static void con_start(struct tty_struct *tty)
2762 {
2763 int console_num;
2764 if (!tty)
2765 return;
2766 console_num = tty->index;
2767 if (!vc_cons_allocated(console_num))
2768 return;
2769 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2770 set_leds();
2771 }
2772
2773 static void con_flush_chars(struct tty_struct *tty)
2774 {
2775 struct vc_data *vc;
2776
2777 if (in_interrupt()) /* from flush_to_ldisc */
2778 return;
2779
2780 /* if we race with con_close(), vt may be null */
2781 acquire_console_sem();
2782 vc = tty->driver_data;
2783 if (vc)
2784 set_cursor(vc);
2785 release_console_sem();
2786 }
2787
2788 /*
2789 * Allocate the console screen memory.
2790 */
2791 static int con_open(struct tty_struct *tty, struct file *filp)
2792 {
2793 unsigned int currcons = tty->index;
2794 int ret = 0;
2795
2796 acquire_console_sem();
2797 if (tty->driver_data == NULL) {
2798 ret = vc_allocate(currcons);
2799 if (ret == 0) {
2800 struct vc_data *vc = vc_cons[currcons].d;
2801
2802 /* Still being freed */
2803 if (vc->vc_tty) {
2804 release_console_sem();
2805 return -ERESTARTSYS;
2806 }
2807 tty->driver_data = vc;
2808 vc->vc_tty = tty;
2809
2810 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2811 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2812 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2813 }
2814 if (vc->vc_utf)
2815 tty->termios->c_iflag |= IUTF8;
2816 else
2817 tty->termios->c_iflag &= ~IUTF8;
2818 release_console_sem();
2819 return ret;
2820 }
2821 }
2822 release_console_sem();
2823 return ret;
2824 }
2825
2826 static void con_close(struct tty_struct *tty, struct file *filp)
2827 {
2828 /* Nothing to do - we defer to shutdown */
2829 }
2830
2831 static void con_shutdown(struct tty_struct *tty)
2832 {
2833 struct vc_data *vc = tty->driver_data;
2834 BUG_ON(vc == NULL);
2835 acquire_console_sem();
2836 vc->vc_tty = NULL;
2837 release_console_sem();
2838 tty_shutdown(tty);
2839 }
2840
2841 static int default_italic_color = 2; // green (ASCII)
2842 static int default_underline_color = 3; // cyan (ASCII)
2843 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2844 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2845
2846 static void vc_init(struct vc_data *vc, unsigned int rows,
2847 unsigned int cols, int do_clear)
2848 {
2849 int j, k ;
2850
2851 vc->vc_cols = cols;
2852 vc->vc_rows = rows;
2853 vc->vc_size_row = cols << 1;
2854 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2855
2856 set_origin(vc);
2857 vc->vc_pos = vc->vc_origin;
2858 reset_vc(vc);
2859 for (j=k=0; j<16; j++) {
2860 vc->vc_palette[k++] = default_red[j] ;
2861 vc->vc_palette[k++] = default_grn[j] ;
2862 vc->vc_palette[k++] = default_blu[j] ;
2863 }
2864 vc->vc_def_color = 0x07; /* white */
2865 vc->vc_ulcolor = default_underline_color;
2866 vc->vc_itcolor = default_italic_color;
2867 vc->vc_halfcolor = 0x08; /* grey */
2868 init_waitqueue_head(&vc->paste_wait);
2869 reset_terminal(vc, do_clear);
2870 }
2871
2872 /*
2873 * This routine initializes console interrupts, and does nothing
2874 * else. If you want the screen to clear, call tty_write with
2875 * the appropriate escape-sequence.
2876 */
2877
2878 static int __init con_init(void)
2879 {
2880 const char *display_desc = NULL;
2881 struct vc_data *vc;
2882 unsigned int currcons = 0, i;
2883
2884 acquire_console_sem();
2885
2886 if (conswitchp)
2887 display_desc = conswitchp->con_startup();
2888 if (!display_desc) {
2889 fg_console = 0;
2890 release_console_sem();
2891 return 0;
2892 }
2893
2894 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2895 struct con_driver *con_driver = &registered_con_driver[i];
2896
2897 if (con_driver->con == NULL) {
2898 con_driver->con = conswitchp;
2899 con_driver->desc = display_desc;
2900 con_driver->flag = CON_DRIVER_FLAG_INIT;
2901 con_driver->first = 0;
2902 con_driver->last = MAX_NR_CONSOLES - 1;
2903 break;
2904 }
2905 }
2906
2907 for (i = 0; i < MAX_NR_CONSOLES; i++)
2908 con_driver_map[i] = conswitchp;
2909
2910 if (blankinterval) {
2911 blank_state = blank_normal_wait;
2912 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2913 }
2914
2915 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2916 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2917 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2918 visual_init(vc, currcons, 1);
2919 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2920 vc_init(vc, vc->vc_rows, vc->vc_cols,
2921 currcons || !vc->vc_sw->con_save_screen);
2922 }
2923 currcons = fg_console = 0;
2924 master_display_fg = vc = vc_cons[currcons].d;
2925 set_origin(vc);
2926 save_screen(vc);
2927 gotoxy(vc, vc->vc_x, vc->vc_y);
2928 csi_J(vc, 0);
2929 update_screen(vc);
2930 printk("Console: %s %s %dx%d",
2931 vc->vc_can_do_color ? "colour" : "mono",
2932 display_desc, vc->vc_cols, vc->vc_rows);
2933 printable = 1;
2934 printk("\n");
2935
2936 release_console_sem();
2937
2938 #ifdef CONFIG_VT_CONSOLE
2939 register_console(&vt_console_driver);
2940 #endif
2941 return 0;
2942 }
2943 console_initcall(con_init);
2944
2945 static const struct tty_operations con_ops = {
2946 .open = con_open,
2947 .close = con_close,
2948 .write = con_write,
2949 .write_room = con_write_room,
2950 .put_char = con_put_char,
2951 .flush_chars = con_flush_chars,
2952 .chars_in_buffer = con_chars_in_buffer,
2953 .ioctl = vt_ioctl,
2954 #ifdef CONFIG_COMPAT
2955 .compat_ioctl = vt_compat_ioctl,
2956 #endif
2957 .stop = con_stop,
2958 .start = con_start,
2959 .throttle = con_throttle,
2960 .unthrottle = con_unthrottle,
2961 .resize = vt_resize,
2962 .shutdown = con_shutdown
2963 };
2964
2965 static struct cdev vc0_cdev;
2966
2967 int __init vty_init(const struct file_operations *console_fops)
2968 {
2969 cdev_init(&vc0_cdev, console_fops);
2970 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2971 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2972 panic("Couldn't register /dev/tty0 driver\n");
2973 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2974
2975 vcs_init();
2976
2977 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2978 if (!console_driver)
2979 panic("Couldn't allocate console driver\n");
2980 console_driver->owner = THIS_MODULE;
2981 console_driver->name = "tty";
2982 console_driver->name_base = 1;
2983 console_driver->major = TTY_MAJOR;
2984 console_driver->minor_start = 1;
2985 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2986 console_driver->init_termios = tty_std_termios;
2987 if (default_utf8)
2988 console_driver->init_termios.c_iflag |= IUTF8;
2989 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2990 tty_set_operations(console_driver, &con_ops);
2991 if (tty_register_driver(console_driver))
2992 panic("Couldn't register console driver\n");
2993 kbd_init();
2994 console_map_init();
2995 #ifdef CONFIG_MDA_CONSOLE
2996 mda_console_init();
2997 #endif
2998 return 0;
2999 }
3000
3001 #ifndef VT_SINGLE_DRIVER
3002
3003 static struct class *vtconsole_class;
3004
3005 static int bind_con_driver(const struct consw *csw, int first, int last,
3006 int deflt)
3007 {
3008 struct module *owner = csw->owner;
3009 const char *desc = NULL;
3010 struct con_driver *con_driver;
3011 int i, j = -1, k = -1, retval = -ENODEV;
3012
3013 if (!try_module_get(owner))
3014 return -ENODEV;
3015
3016 acquire_console_sem();
3017
3018 /* check if driver is registered */
3019 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3020 con_driver = &registered_con_driver[i];
3021
3022 if (con_driver->con == csw) {
3023 desc = con_driver->desc;
3024 retval = 0;
3025 break;
3026 }
3027 }
3028
3029 if (retval)
3030 goto err;
3031
3032 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3033 csw->con_startup();
3034 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3035 }
3036
3037 if (deflt) {
3038 if (conswitchp)
3039 module_put(conswitchp->owner);
3040
3041 __module_get(owner);
3042 conswitchp = csw;
3043 }
3044
3045 first = max(first, con_driver->first);
3046 last = min(last, con_driver->last);
3047
3048 for (i = first; i <= last; i++) {
3049 int old_was_color;
3050 struct vc_data *vc = vc_cons[i].d;
3051
3052 if (con_driver_map[i])
3053 module_put(con_driver_map[i]->owner);
3054 __module_get(owner);
3055 con_driver_map[i] = csw;
3056
3057 if (!vc || !vc->vc_sw)
3058 continue;
3059
3060 j = i;
3061
3062 if (CON_IS_VISIBLE(vc)) {
3063 k = i;
3064 save_screen(vc);
3065 }
3066
3067 old_was_color = vc->vc_can_do_color;
3068 vc->vc_sw->con_deinit(vc);
3069 if (!vc->vc_origin)
3070 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3071 visual_init(vc, i, 0);
3072 set_origin(vc);
3073 update_attr(vc);
3074
3075 /* If the console changed between mono <-> color, then
3076 * the attributes in the screenbuf will be wrong. The
3077 * following resets all attributes to something sane.
3078 */
3079 if (old_was_color != vc->vc_can_do_color)
3080 clear_buffer_attributes(vc);
3081 }
3082
3083 printk("Console: switching ");
3084 if (!deflt)
3085 printk("consoles %d-%d ", first+1, last+1);
3086 if (j >= 0) {
3087 struct vc_data *vc = vc_cons[j].d;
3088
3089 printk("to %s %s %dx%d\n",
3090 vc->vc_can_do_color ? "colour" : "mono",
3091 desc, vc->vc_cols, vc->vc_rows);
3092
3093 if (k >= 0) {
3094 vc = vc_cons[k].d;
3095 update_screen(vc);
3096 }
3097 } else
3098 printk("to %s\n", desc);
3099
3100 retval = 0;
3101 err:
3102 release_console_sem();
3103 module_put(owner);
3104 return retval;
3105 };
3106
3107 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3108 static int con_is_graphics(const struct consw *csw, int first, int last)
3109 {
3110 int i, retval = 0;
3111
3112 for (i = first; i <= last; i++) {
3113 struct vc_data *vc = vc_cons[i].d;
3114
3115 if (vc && vc->vc_mode == KD_GRAPHICS) {
3116 retval = 1;
3117 break;
3118 }
3119 }
3120
3121 return retval;
3122 }
3123
3124 /**
3125 * unbind_con_driver - unbind a console driver
3126 * @csw: pointer to console driver to unregister
3127 * @first: first in range of consoles that @csw should be unbound from
3128 * @last: last in range of consoles that @csw should be unbound from
3129 * @deflt: should next bound console driver be default after @csw is unbound?
3130 *
3131 * To unbind a driver from all possible consoles, pass 0 as @first and
3132 * %MAX_NR_CONSOLES as @last.
3133 *
3134 * @deflt controls whether the console that ends up replacing @csw should be
3135 * the default console.
3136 *
3137 * RETURNS:
3138 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3139 * or 0 on success.
3140 */
3141 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3142 {
3143 struct module *owner = csw->owner;
3144 const struct consw *defcsw = NULL;
3145 struct con_driver *con_driver = NULL, *con_back = NULL;
3146 int i, retval = -ENODEV;
3147
3148 if (!try_module_get(owner))
3149 return -ENODEV;
3150
3151 acquire_console_sem();
3152
3153 /* check if driver is registered and if it is unbindable */
3154 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3155 con_driver = &registered_con_driver[i];
3156
3157 if (con_driver->con == csw &&
3158 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3159 retval = 0;
3160 break;
3161 }
3162 }
3163
3164 if (retval) {
3165 release_console_sem();
3166 goto err;
3167 }
3168
3169 retval = -ENODEV;
3170
3171 /* check if backup driver exists */
3172 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3173 con_back = &registered_con_driver[i];
3174
3175 if (con_back->con &&
3176 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3177 defcsw = con_back->con;
3178 retval = 0;
3179 break;
3180 }
3181 }
3182
3183 if (retval) {
3184 release_console_sem();
3185 goto err;
3186 }
3187
3188 if (!con_is_bound(csw)) {
3189 release_console_sem();
3190 goto err;
3191 }
3192
3193 first = max(first, con_driver->first);
3194 last = min(last, con_driver->last);
3195
3196 for (i = first; i <= last; i++) {
3197 if (con_driver_map[i] == csw) {
3198 module_put(csw->owner);
3199 con_driver_map[i] = NULL;
3200 }
3201 }
3202
3203 if (!con_is_bound(defcsw)) {
3204 const struct consw *defconsw = conswitchp;
3205
3206 defcsw->con_startup();
3207 con_back->flag |= CON_DRIVER_FLAG_INIT;
3208 /*
3209 * vgacon may change the default driver to point
3210 * to dummycon, we restore it here...
3211 */
3212 conswitchp = defconsw;
3213 }
3214
3215 if (!con_is_bound(csw))
3216 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3217
3218 release_console_sem();
3219 /* ignore return value, binding should not fail */
3220 bind_con_driver(defcsw, first, last, deflt);
3221 err:
3222 module_put(owner);
3223 return retval;
3224
3225 }
3226 EXPORT_SYMBOL(unbind_con_driver);
3227
3228 static int vt_bind(struct con_driver *con)
3229 {
3230 const struct consw *defcsw = NULL, *csw = NULL;
3231 int i, more = 1, first = -1, last = -1, deflt = 0;
3232
3233 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3234 con_is_graphics(con->con, con->first, con->last))
3235 goto err;
3236
3237 csw = con->con;
3238
3239 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3240 struct con_driver *con = &registered_con_driver[i];
3241
3242 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3243 defcsw = con->con;
3244 break;
3245 }
3246 }
3247
3248 if (!defcsw)
3249 goto err;
3250
3251 while (more) {
3252 more = 0;
3253
3254 for (i = con->first; i <= con->last; i++) {
3255 if (con_driver_map[i] == defcsw) {
3256 if (first == -1)
3257 first = i;
3258 last = i;
3259 more = 1;
3260 } else if (first != -1)
3261 break;
3262 }
3263
3264 if (first == 0 && last == MAX_NR_CONSOLES -1)
3265 deflt = 1;
3266
3267 if (first != -1)
3268 bind_con_driver(csw, first, last, deflt);
3269
3270 first = -1;
3271 last = -1;
3272 deflt = 0;
3273 }
3274
3275 err:
3276 return 0;
3277 }
3278
3279 static int vt_unbind(struct con_driver *con)
3280 {
3281 const struct consw *csw = NULL;
3282 int i, more = 1, first = -1, last = -1, deflt = 0;
3283
3284 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3285 con_is_graphics(con->con, con->first, con->last))
3286 goto err;
3287
3288 csw = con->con;
3289
3290 while (more) {
3291 more = 0;
3292
3293 for (i = con->first; i <= con->last; i++) {
3294 if (con_driver_map[i] == csw) {
3295 if (first == -1)
3296 first = i;
3297 last = i;
3298 more = 1;
3299 } else if (first != -1)
3300 break;
3301 }
3302
3303 if (first == 0 && last == MAX_NR_CONSOLES -1)
3304 deflt = 1;
3305
3306 if (first != -1)
3307 unbind_con_driver(csw, first, last, deflt);
3308
3309 first = -1;
3310 last = -1;
3311 deflt = 0;
3312 }
3313
3314 err:
3315 return 0;
3316 }
3317 #else
3318 static inline int vt_bind(struct con_driver *con)
3319 {
3320 return 0;
3321 }
3322 static inline int vt_unbind(struct con_driver *con)
3323 {
3324 return 0;
3325 }
3326 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3327
3328 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3329 const char *buf, size_t count)
3330 {
3331 struct con_driver *con = dev_get_drvdata(dev);
3332 int bind = simple_strtoul(buf, NULL, 0);
3333
3334 if (bind)
3335 vt_bind(con);
3336 else
3337 vt_unbind(con);
3338
3339 return count;
3340 }
3341
3342 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3343 char *buf)
3344 {
3345 struct con_driver *con = dev_get_drvdata(dev);
3346 int bind = con_is_bound(con->con);
3347
3348 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3349 }
3350
3351 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3352 char *buf)
3353 {
3354 struct con_driver *con = dev_get_drvdata(dev);
3355
3356 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3357 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3358 con->desc);
3359
3360 }
3361
3362 static struct device_attribute device_attrs[] = {
3363 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3364 __ATTR(name, S_IRUGO, show_name, NULL),
3365 };
3366
3367 static int vtconsole_init_device(struct con_driver *con)
3368 {
3369 int i;
3370 int error = 0;
3371
3372 con->flag |= CON_DRIVER_FLAG_ATTR;
3373 dev_set_drvdata(con->dev, con);
3374 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3375 error = device_create_file(con->dev, &device_attrs[i]);
3376 if (error)
3377 break;
3378 }
3379
3380 if (error) {
3381 while (--i >= 0)
3382 device_remove_file(con->dev, &device_attrs[i]);
3383 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3384 }
3385
3386 return error;
3387 }
3388
3389 static void vtconsole_deinit_device(struct con_driver *con)
3390 {
3391 int i;
3392
3393 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3394 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3395 device_remove_file(con->dev, &device_attrs[i]);
3396 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3397 }
3398 }
3399
3400 /**
3401 * con_is_bound - checks if driver is bound to the console
3402 * @csw: console driver
3403 *
3404 * RETURNS: zero if unbound, nonzero if bound
3405 *
3406 * Drivers can call this and if zero, they should release
3407 * all resources allocated on con_startup()
3408 */
3409 int con_is_bound(const struct consw *csw)
3410 {
3411 int i, bound = 0;
3412
3413 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3414 if (con_driver_map[i] == csw) {
3415 bound = 1;
3416 break;
3417 }
3418 }
3419
3420 return bound;
3421 }
3422 EXPORT_SYMBOL(con_is_bound);
3423
3424 /**
3425 * con_debug_enter - prepare the console for the kernel debugger
3426 * @sw: console driver
3427 *
3428 * Called when the console is taken over by the kernel debugger, this
3429 * function needs to save the current console state, then put the console
3430 * into a state suitable for the kernel debugger.
3431 *
3432 * RETURNS:
3433 * Zero on success, nonzero if a failure occurred when trying to prepare
3434 * the console for the debugger.
3435 */
3436 int con_debug_enter(struct vc_data *vc)
3437 {
3438 int ret = 0;
3439
3440 saved_fg_console = fg_console;
3441 saved_last_console = last_console;
3442 saved_want_console = want_console;
3443 saved_vc_mode = vc->vc_mode;
3444 vc->vc_mode = KD_TEXT;
3445 console_blanked = 0;
3446 if (vc->vc_sw->con_debug_enter)
3447 ret = vc->vc_sw->con_debug_enter(vc);
3448 #ifdef CONFIG_KGDB_KDB
3449 /* Set the initial LINES variable if it is not already set */
3450 if (vc->vc_rows < 999) {
3451 int linecount;
3452 char lns[4];
3453 const char *setargs[3] = {
3454 "set",
3455 "LINES",
3456 lns,
3457 };
3458 if (kdbgetintenv(setargs[0], &linecount)) {
3459 snprintf(lns, 4, "%i", vc->vc_rows);
3460 kdb_set(2, setargs);
3461 }
3462 }
3463 #endif /* CONFIG_KGDB_KDB */
3464 return ret;
3465 }
3466 EXPORT_SYMBOL_GPL(con_debug_enter);
3467
3468 /**
3469 * con_debug_leave - restore console state
3470 * @sw: console driver
3471 *
3472 * Restore the console state to what it was before the kernel debugger
3473 * was invoked.
3474 *
3475 * RETURNS:
3476 * Zero on success, nonzero if a failure occurred when trying to restore
3477 * the console.
3478 */
3479 int con_debug_leave(void)
3480 {
3481 struct vc_data *vc;
3482 int ret = 0;
3483
3484 fg_console = saved_fg_console;
3485 last_console = saved_last_console;
3486 want_console = saved_want_console;
3487 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3488
3489 vc = vc_cons[fg_console].d;
3490 if (vc->vc_sw->con_debug_leave)
3491 ret = vc->vc_sw->con_debug_leave(vc);
3492 return ret;
3493 }
3494 EXPORT_SYMBOL_GPL(con_debug_leave);
3495
3496 /**
3497 * register_con_driver - register console driver to console layer
3498 * @csw: console driver
3499 * @first: the first console to take over, minimum value is 0
3500 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3501 *
3502 * DESCRIPTION: This function registers a console driver which can later
3503 * bind to a range of consoles specified by @first and @last. It will
3504 * also initialize the console driver by calling con_startup().
3505 */
3506 int register_con_driver(const struct consw *csw, int first, int last)
3507 {
3508 struct module *owner = csw->owner;
3509 struct con_driver *con_driver;
3510 const char *desc;
3511 int i, retval = 0;
3512
3513 if (!try_module_get(owner))
3514 return -ENODEV;
3515
3516 acquire_console_sem();
3517
3518 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3519 con_driver = &registered_con_driver[i];
3520
3521 /* already registered */
3522 if (con_driver->con == csw)
3523 retval = -EINVAL;
3524 }
3525
3526 if (retval)
3527 goto err;
3528
3529 desc = csw->con_startup();
3530
3531 if (!desc)
3532 goto err;
3533
3534 retval = -EINVAL;
3535
3536 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3537 con_driver = &registered_con_driver[i];
3538
3539 if (con_driver->con == NULL) {
3540 con_driver->con = csw;
3541 con_driver->desc = desc;
3542 con_driver->node = i;
3543 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3544 CON_DRIVER_FLAG_INIT;
3545 con_driver->first = first;
3546 con_driver->last = last;
3547 retval = 0;
3548 break;
3549 }
3550 }
3551
3552 if (retval)
3553 goto err;
3554
3555 con_driver->dev = device_create(vtconsole_class, NULL,
3556 MKDEV(0, con_driver->node),
3557 NULL, "vtcon%i",
3558 con_driver->node);
3559
3560 if (IS_ERR(con_driver->dev)) {
3561 printk(KERN_WARNING "Unable to create device for %s; "
3562 "errno = %ld\n", con_driver->desc,
3563 PTR_ERR(con_driver->dev));
3564 con_driver->dev = NULL;
3565 } else {
3566 vtconsole_init_device(con_driver);
3567 }
3568
3569 err:
3570 release_console_sem();
3571 module_put(owner);
3572 return retval;
3573 }
3574 EXPORT_SYMBOL(register_con_driver);
3575
3576 /**
3577 * unregister_con_driver - unregister console driver from console layer
3578 * @csw: console driver
3579 *
3580 * DESCRIPTION: All drivers that registers to the console layer must
3581 * call this function upon exit, or if the console driver is in a state
3582 * where it won't be able to handle console services, such as the
3583 * framebuffer console without loaded framebuffer drivers.
3584 *
3585 * The driver must unbind first prior to unregistration.
3586 */
3587 int unregister_con_driver(const struct consw *csw)
3588 {
3589 int i, retval = -ENODEV;
3590
3591 acquire_console_sem();
3592
3593 /* cannot unregister a bound driver */
3594 if (con_is_bound(csw))
3595 goto err;
3596
3597 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3598 struct con_driver *con_driver = &registered_con_driver[i];
3599
3600 if (con_driver->con == csw &&
3601 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3602 vtconsole_deinit_device(con_driver);
3603 device_destroy(vtconsole_class,
3604 MKDEV(0, con_driver->node));
3605 con_driver->con = NULL;
3606 con_driver->desc = NULL;
3607 con_driver->dev = NULL;
3608 con_driver->node = 0;
3609 con_driver->flag = 0;
3610 con_driver->first = 0;
3611 con_driver->last = 0;
3612 retval = 0;
3613 break;
3614 }
3615 }
3616 err:
3617 release_console_sem();
3618 return retval;
3619 }
3620 EXPORT_SYMBOL(unregister_con_driver);
3621
3622 /*
3623 * If we support more console drivers, this function is used
3624 * when a driver wants to take over some existing consoles
3625 * and become default driver for newly opened ones.
3626 *
3627 * take_over_console is basically a register followed by unbind
3628 */
3629 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3630 {
3631 int err;
3632
3633 err = register_con_driver(csw, first, last);
3634
3635 if (!err)
3636 bind_con_driver(csw, first, last, deflt);
3637
3638 return err;
3639 }
3640
3641 /*
3642 * give_up_console is a wrapper to unregister_con_driver. It will only
3643 * work if driver is fully unbound.
3644 */
3645 void give_up_console(const struct consw *csw)
3646 {
3647 unregister_con_driver(csw);
3648 }
3649
3650 static int __init vtconsole_class_init(void)
3651 {
3652 int i;
3653
3654 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3655 if (IS_ERR(vtconsole_class)) {
3656 printk(KERN_WARNING "Unable to create vt console class; "
3657 "errno = %ld\n", PTR_ERR(vtconsole_class));
3658 vtconsole_class = NULL;
3659 }
3660
3661 /* Add system drivers to sysfs */
3662 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3663 struct con_driver *con = &registered_con_driver[i];
3664
3665 if (con->con && !con->dev) {
3666 con->dev = device_create(vtconsole_class, NULL,
3667 MKDEV(0, con->node),
3668 NULL, "vtcon%i",
3669 con->node);
3670
3671 if (IS_ERR(con->dev)) {
3672 printk(KERN_WARNING "Unable to create "
3673 "device for %s; errno = %ld\n",
3674 con->desc, PTR_ERR(con->dev));
3675 con->dev = NULL;
3676 } else {
3677 vtconsole_init_device(con);
3678 }
3679 }
3680 }
3681
3682 return 0;
3683 }
3684 postcore_initcall(vtconsole_class_init);
3685
3686 #endif
3687
3688 /*
3689 * Screen blanking
3690 */
3691
3692 static int set_vesa_blanking(char __user *p)
3693 {
3694 unsigned int mode;
3695
3696 if (get_user(mode, p + 1))
3697 return -EFAULT;
3698
3699 vesa_blank_mode = (mode < 4) ? mode : 0;
3700 return 0;
3701 }
3702
3703 void do_blank_screen(int entering_gfx)
3704 {
3705 struct vc_data *vc = vc_cons[fg_console].d;
3706 int i;
3707
3708 WARN_CONSOLE_UNLOCKED();
3709
3710 if (console_blanked) {
3711 if (blank_state == blank_vesa_wait) {
3712 blank_state = blank_off;
3713 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3714 }
3715 return;
3716 }
3717
3718 /* entering graphics mode? */
3719 if (entering_gfx) {
3720 hide_cursor(vc);
3721 save_screen(vc);
3722 vc->vc_sw->con_blank(vc, -1, 1);
3723 console_blanked = fg_console + 1;
3724 blank_state = blank_off;
3725 set_origin(vc);
3726 return;
3727 }
3728
3729 if (blank_state != blank_normal_wait)
3730 return;
3731 blank_state = blank_off;
3732
3733 /* don't blank graphics */
3734 if (vc->vc_mode != KD_TEXT) {
3735 console_blanked = fg_console + 1;
3736 return;
3737 }
3738
3739 hide_cursor(vc);
3740 del_timer_sync(&console_timer);
3741 blank_timer_expired = 0;
3742
3743 save_screen(vc);
3744 /* In case we need to reset origin, blanking hook returns 1 */
3745 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3746 console_blanked = fg_console + 1;
3747 if (i)
3748 set_origin(vc);
3749
3750 if (console_blank_hook && console_blank_hook(1))
3751 return;
3752
3753 if (vesa_off_interval && vesa_blank_mode) {
3754 blank_state = blank_vesa_wait;
3755 mod_timer(&console_timer, jiffies + vesa_off_interval);
3756 }
3757 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3758 }
3759 EXPORT_SYMBOL(do_blank_screen);
3760
3761 /*
3762 * Called by timer as well as from vt_console_driver
3763 */
3764 void do_unblank_screen(int leaving_gfx)
3765 {
3766 struct vc_data *vc;
3767
3768 /* This should now always be called from a "sane" (read: can schedule)
3769 * context for the sake of the low level drivers, except in the special
3770 * case of oops_in_progress
3771 */
3772 if (!oops_in_progress)
3773 might_sleep();
3774
3775 WARN_CONSOLE_UNLOCKED();
3776
3777 ignore_poke = 0;
3778 if (!console_blanked)
3779 return;
3780 if (!vc_cons_allocated(fg_console)) {
3781 /* impossible */
3782 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3783 return;
3784 }
3785 vc = vc_cons[fg_console].d;
3786 if (vc->vc_mode != KD_TEXT)
3787 return; /* but leave console_blanked != 0 */
3788
3789 if (blankinterval) {
3790 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3791 blank_state = blank_normal_wait;
3792 }
3793
3794 console_blanked = 0;
3795 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3796 /* Low-level driver cannot restore -> do it ourselves */
3797 update_screen(vc);
3798 if (console_blank_hook)
3799 console_blank_hook(0);
3800 set_palette(vc);
3801 set_cursor(vc);
3802 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3803 }
3804 EXPORT_SYMBOL(do_unblank_screen);
3805
3806 /*
3807 * This is called by the outside world to cause a forced unblank, mostly for
3808 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3809 * call it with 1 as an argument and so force a mode restore... that may kill
3810 * X or at least garbage the screen but would also make the Oops visible...
3811 */
3812 void unblank_screen(void)
3813 {
3814 do_unblank_screen(0);
3815 }
3816
3817 /*
3818 * We defer the timer blanking to work queue so it can take the console mutex
3819 * (console operations can still happen at irq time, but only from printk which
3820 * has the console mutex. Not perfect yet, but better than no locking
3821 */
3822 static void blank_screen_t(unsigned long dummy)
3823 {
3824 if (unlikely(!keventd_up())) {
3825 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3826 return;
3827 }
3828 blank_timer_expired = 1;
3829 schedule_work(&console_work);
3830 }
3831
3832 void poke_blanked_console(void)
3833 {
3834 WARN_CONSOLE_UNLOCKED();
3835
3836 /* Add this so we quickly catch whoever might call us in a non
3837 * safe context. Nowadays, unblank_screen() isn't to be called in
3838 * atomic contexts and is allowed to schedule (with the special case
3839 * of oops_in_progress, but that isn't of any concern for this
3840 * function. --BenH.
3841 */
3842 might_sleep();
3843
3844 /* This isn't perfectly race free, but a race here would be mostly harmless,
3845 * at worse, we'll do a spurrious blank and it's unlikely
3846 */
3847 del_timer(&console_timer);
3848 blank_timer_expired = 0;
3849
3850 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3851 return;
3852 if (console_blanked)
3853 unblank_screen();
3854 else if (blankinterval) {
3855 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3856 blank_state = blank_normal_wait;
3857 }
3858 }
3859
3860 /*
3861 * Palettes
3862 */
3863
3864 static void set_palette(struct vc_data *vc)
3865 {
3866 WARN_CONSOLE_UNLOCKED();
3867
3868 if (vc->vc_mode != KD_GRAPHICS)
3869 vc->vc_sw->con_set_palette(vc, color_table);
3870 }
3871
3872 static int set_get_cmap(unsigned char __user *arg, int set)
3873 {
3874 int i, j, k;
3875
3876 WARN_CONSOLE_UNLOCKED();
3877
3878 for (i = 0; i < 16; i++)
3879 if (set) {
3880 get_user(default_red[i], arg++);
3881 get_user(default_grn[i], arg++);
3882 get_user(default_blu[i], arg++);
3883 } else {
3884 put_user(default_red[i], arg++);
3885 put_user(default_grn[i], arg++);
3886 put_user(default_blu[i], arg++);
3887 }
3888 if (set) {
3889 for (i = 0; i < MAX_NR_CONSOLES; i++)
3890 if (vc_cons_allocated(i)) {
3891 for (j = k = 0; j < 16; j++) {
3892 vc_cons[i].d->vc_palette[k++] = default_red[j];
3893 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3894 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3895 }
3896 set_palette(vc_cons[i].d);
3897 }
3898 }
3899 return 0;
3900 }
3901
3902 /*
3903 * Load palette into the DAC registers. arg points to a colour
3904 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3905 */
3906
3907 int con_set_cmap(unsigned char __user *arg)
3908 {
3909 int rc;
3910
3911 acquire_console_sem();
3912 rc = set_get_cmap (arg,1);
3913 release_console_sem();
3914
3915 return rc;
3916 }
3917
3918 int con_get_cmap(unsigned char __user *arg)
3919 {
3920 int rc;
3921
3922 acquire_console_sem();
3923 rc = set_get_cmap (arg,0);
3924 release_console_sem();
3925
3926 return rc;
3927 }
3928
3929 void reset_palette(struct vc_data *vc)
3930 {
3931 int j, k;
3932 for (j=k=0; j<16; j++) {
3933 vc->vc_palette[k++] = default_red[j];
3934 vc->vc_palette[k++] = default_grn[j];
3935 vc->vc_palette[k++] = default_blu[j];
3936 }
3937 set_palette(vc);
3938 }
3939
3940 /*
3941 * Font switching
3942 *
3943 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3944 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3945 * depending on width) reserved for each character which is kinda wasty, but
3946 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3947 * is upto the actual low-level console-driver convert data into its favorite
3948 * format (maybe we should add a `fontoffset' field to the `display'
3949 * structure so we won't have to convert the fontdata all the time.
3950 * /Jes
3951 */
3952
3953 #define max_font_size 65536
3954
3955 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3956 {
3957 struct console_font font;
3958 int rc = -EINVAL;
3959 int c;
3960
3961 if (vc->vc_mode != KD_TEXT)
3962 return -EINVAL;
3963
3964 if (op->data) {
3965 font.data = kmalloc(max_font_size, GFP_KERNEL);
3966 if (!font.data)
3967 return -ENOMEM;
3968 } else
3969 font.data = NULL;
3970
3971 acquire_console_sem();
3972 if (vc->vc_sw->con_font_get)
3973 rc = vc->vc_sw->con_font_get(vc, &font);
3974 else
3975 rc = -ENOSYS;
3976 release_console_sem();
3977
3978 if (rc)
3979 goto out;
3980
3981 c = (font.width+7)/8 * 32 * font.charcount;
3982
3983 if (op->data && font.charcount > op->charcount)
3984 rc = -ENOSPC;
3985 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3986 if (font.width > op->width || font.height > op->height)
3987 rc = -ENOSPC;
3988 } else {
3989 if (font.width != 8)
3990 rc = -EIO;
3991 else if ((op->height && font.height > op->height) ||
3992 font.height > 32)
3993 rc = -ENOSPC;
3994 }
3995 if (rc)
3996 goto out;
3997
3998 op->height = font.height;
3999 op->width = font.width;
4000 op->charcount = font.charcount;
4001
4002 if (op->data && copy_to_user(op->data, font.data, c))
4003 rc = -EFAULT;
4004
4005 out:
4006 kfree(font.data);
4007 return rc;
4008 }
4009
4010 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4011 {
4012 struct console_font font;
4013 int rc = -EINVAL;
4014 int size;
4015
4016 if (vc->vc_mode != KD_TEXT)
4017 return -EINVAL;
4018 if (!op->data)
4019 return -EINVAL;
4020 if (op->charcount > 512)
4021 return -EINVAL;
4022 if (!op->height) { /* Need to guess font height [compat] */
4023 int h, i;
4024 u8 __user *charmap = op->data;
4025 u8 tmp;
4026
4027 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4028 so that we can get rid of this soon */
4029 if (!(op->flags & KD_FONT_FLAG_OLD))
4030 return -EINVAL;
4031 for (h = 32; h > 0; h--)
4032 for (i = 0; i < op->charcount; i++) {
4033 if (get_user(tmp, &charmap[32*i+h-1]))
4034 return -EFAULT;
4035 if (tmp)
4036 goto nonzero;
4037 }
4038 return -EINVAL;
4039 nonzero:
4040 op->height = h;
4041 }
4042 if (op->width <= 0 || op->width > 32 || op->height > 32)
4043 return -EINVAL;
4044 size = (op->width+7)/8 * 32 * op->charcount;
4045 if (size > max_font_size)
4046 return -ENOSPC;
4047 font.charcount = op->charcount;
4048 font.height = op->height;
4049 font.width = op->width;
4050 font.data = memdup_user(op->data, size);
4051 if (IS_ERR(font.data))
4052 return PTR_ERR(font.data);
4053 acquire_console_sem();
4054 if (vc->vc_sw->con_font_set)
4055 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4056 else
4057 rc = -ENOSYS;
4058 release_console_sem();
4059 kfree(font.data);
4060 return rc;
4061 }
4062
4063 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4064 {
4065 struct console_font font = {.width = op->width, .height = op->height};
4066 char name[MAX_FONT_NAME];
4067 char *s = name;
4068 int rc;
4069
4070 if (vc->vc_mode != KD_TEXT)
4071 return -EINVAL;
4072
4073 if (!op->data)
4074 s = NULL;
4075 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4076 return -EFAULT;
4077 else
4078 name[MAX_FONT_NAME - 1] = 0;
4079
4080 acquire_console_sem();
4081 if (vc->vc_sw->con_font_default)
4082 rc = vc->vc_sw->con_font_default(vc, &font, s);
4083 else
4084 rc = -ENOSYS;
4085 release_console_sem();
4086 if (!rc) {
4087 op->width = font.width;
4088 op->height = font.height;
4089 }
4090 return rc;
4091 }
4092
4093 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4094 {
4095 int con = op->height;
4096 int rc;
4097
4098 if (vc->vc_mode != KD_TEXT)
4099 return -EINVAL;
4100
4101 acquire_console_sem();
4102 if (!vc->vc_sw->con_font_copy)
4103 rc = -ENOSYS;
4104 else if (con < 0 || !vc_cons_allocated(con))
4105 rc = -ENOTTY;
4106 else if (con == vc->vc_num) /* nothing to do */
4107 rc = 0;
4108 else
4109 rc = vc->vc_sw->con_font_copy(vc, con);
4110 release_console_sem();
4111 return rc;
4112 }
4113
4114 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4115 {
4116 switch (op->op) {
4117 case KD_FONT_OP_SET:
4118 return con_font_set(vc, op);
4119 case KD_FONT_OP_GET:
4120 return con_font_get(vc, op);
4121 case KD_FONT_OP_SET_DEFAULT:
4122 return con_font_default(vc, op);
4123 case KD_FONT_OP_COPY:
4124 return con_font_copy(vc, op);
4125 }
4126 return -ENOSYS;
4127 }
4128
4129 /*
4130 * Interface exported to selection and vcs.
4131 */
4132
4133 /* used by selection */
4134 u16 screen_glyph(struct vc_data *vc, int offset)
4135 {
4136 u16 w = scr_readw(screenpos(vc, offset, 1));
4137 u16 c = w & 0xff;
4138
4139 if (w & vc->vc_hi_font_mask)
4140 c |= 0x100;
4141 return c;
4142 }
4143 EXPORT_SYMBOL_GPL(screen_glyph);
4144
4145 /* used by vcs - note the word offset */
4146 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4147 {
4148 return screenpos(vc, 2 * w_offset, viewed);
4149 }
4150
4151 void getconsxy(struct vc_data *vc, unsigned char *p)
4152 {
4153 p[0] = vc->vc_x;
4154 p[1] = vc->vc_y;
4155 }
4156
4157 void putconsxy(struct vc_data *vc, unsigned char *p)
4158 {
4159 hide_cursor(vc);
4160 gotoxy(vc, p[0], p[1]);
4161 set_cursor(vc);
4162 }
4163
4164 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4165 {
4166 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4167 return softcursor_original;
4168 return scr_readw(org);
4169 }
4170
4171 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4172 {
4173 scr_writew(val, org);
4174 if ((unsigned long)org == vc->vc_pos) {
4175 softcursor_original = -1;
4176 add_softcursor(vc);
4177 }
4178 }
4179
4180 /*
4181 * Visible symbols for modules
4182 */
4183
4184 EXPORT_SYMBOL(color_table);
4185 EXPORT_SYMBOL(default_red);
4186 EXPORT_SYMBOL(default_grn);
4187 EXPORT_SYMBOL(default_blu);
4188 EXPORT_SYMBOL(update_region);
4189 EXPORT_SYMBOL(redraw_screen);
4190 EXPORT_SYMBOL(vc_resize);
4191 EXPORT_SYMBOL(fg_console);
4192 EXPORT_SYMBOL(console_blank_hook);
4193 EXPORT_SYMBOL(console_blanked);
4194 EXPORT_SYMBOL(vc_cons);
4195 EXPORT_SYMBOL(global_cursor_default);
4196 #ifndef VT_SINGLE_DRIVER
4197 EXPORT_SYMBOL(take_over_console);
4198 EXPORT_SYMBOL(give_up_console);
4199 #endif
Linux kernel - Deliverables
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