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Fix misspellings of "system", "controller", "interrupt" and "necessary".
[linux-2.6.git] / drivers / char / vt.c
blob7a5badfb7d846e00d85dbbd2c082461264b7a660
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 <andrewm@uow.edu.au>
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/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/bootmem.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103
104 #include <asm/io.h>
105 #include <asm/system.h>
106 #include <asm/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164
165 /*
166 * ignore_poke: don't unblank the screen when things are typed. This is
167 * mainly for the privacy of braille terminal users.
168 */
169 static int ignore_poke;
170
171 int do_poke_blanked_console;
172 int console_blanked;
173
174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
175 static int blankinterval = 10*60*HZ;
176 static int vesa_off_interval;
177
178 static DECLARE_WORK(console_work, console_callback);
179
180 /*
181 * fg_console is the current virtual console,
182 * last_console is the last used one,
183 * want_console is the console we want to switch to,
184 * kmsg_redirect is the console for kernel messages,
185 */
186 int fg_console;
187 int last_console;
188 int want_console = -1;
189 int kmsg_redirect;
190
191 /*
192 * For each existing display, we have a pointer to console currently visible
193 * on that display, allowing consoles other than fg_console to be refreshed
194 * appropriately. Unless the low-level driver supplies its own display_fg
195 * variable, we use this one for the "master display".
196 */
197 static struct vc_data *master_display_fg;
198
199 /*
200 * Unfortunately, we need to delay tty echo when we're currently writing to the
201 * console since the code is (and always was) not re-entrant, so we schedule
202 * all flip requests to process context with schedule-task() and run it from
203 * console_callback().
204 */
205
206 /*
207 * For the same reason, we defer scrollback to the console callback.
208 */
209 static int scrollback_delta;
210
211 /*
212 * Hook so that the power management routines can (un)blank
213 * the console on our behalf.
214 */
215 int (*console_blank_hook)(int);
216
217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
218 static int blank_state;
219 static int blank_timer_expired;
220 enum {
221 blank_off = 0,
222 blank_normal_wait,
223 blank_vesa_wait,
224 };
225
226 /*
227 * Notifier list for console events.
228 */
229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
230
231 int register_vt_notifier(struct notifier_block *nb)
232 {
233 return atomic_notifier_chain_register(&vt_notifier_list, nb);
234 }
235 EXPORT_SYMBOL_GPL(register_vt_notifier);
236
237 int unregister_vt_notifier(struct notifier_block *nb)
238 {
239 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
240 }
241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
242
243 static void notify_write(struct vc_data *vc, unsigned int unicode)
244 {
245 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
246 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
247 }
248
249 static void notify_update(struct vc_data *vc)
250 {
251 struct vt_notifier_param param = { .vc = vc };
252 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
253 }
254
255 /*
256 * Low-Level Functions
257 */
258
259 #define IS_FG(vc) ((vc)->vc_num == fg_console)
260
261 #ifdef VT_BUF_VRAM_ONLY
262 #define DO_UPDATE(vc) 0
263 #else
264 #define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
265 #endif
266
267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
268 {
269 unsigned short *p;
270
271 if (!viewed)
272 p = (unsigned short *)(vc->vc_origin + offset);
273 else if (!vc->vc_sw->con_screen_pos)
274 p = (unsigned short *)(vc->vc_visible_origin + offset);
275 else
276 p = vc->vc_sw->con_screen_pos(vc, offset);
277 return p;
278 }
279
280 static inline void scrolldelta(int lines)
281 {
282 scrollback_delta += lines;
283 schedule_console_callback();
284 }
285
286 void schedule_console_callback(void)
287 {
288 schedule_work(&console_work);
289 }
290
291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
292 {
293 unsigned short *d, *s;
294
295 if (t+nr >= b)
296 nr = b - t - 1;
297 if (b > vc->vc_rows || t >= b || nr < 1)
298 return;
299 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
300 return;
301 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
302 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
303 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
304 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
305 vc->vc_size_row * nr);
306 }
307
308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
309 {
310 unsigned short *s;
311 unsigned int step;
312
313 if (t+nr >= b)
314 nr = b - t - 1;
315 if (b > vc->vc_rows || t >= b || nr < 1)
316 return;
317 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
318 return;
319 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
320 step = vc->vc_cols * nr;
321 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
322 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
323 }
324
325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
326 {
327 #ifndef VT_BUF_VRAM_ONLY
328 unsigned int xx, yy, offset;
329 u16 *p;
330
331 p = (u16 *) start;
332 if (!vc->vc_sw->con_getxy) {
333 offset = (start - vc->vc_origin) / 2;
334 xx = offset % vc->vc_cols;
335 yy = offset / vc->vc_cols;
336 } else {
337 int nxx, nyy;
338 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
339 xx = nxx; yy = nyy;
340 }
341 for(;;) {
342 u16 attrib = scr_readw(p) & 0xff00;
343 int startx = xx;
344 u16 *q = p;
345 while (xx < vc->vc_cols && count) {
346 if (attrib != (scr_readw(p) & 0xff00)) {
347 if (p > q)
348 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
349 startx = xx;
350 q = p;
351 attrib = scr_readw(p) & 0xff00;
352 }
353 p++;
354 xx++;
355 count--;
356 }
357 if (p > q)
358 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
359 if (!count)
360 break;
361 xx = 0;
362 yy++;
363 if (vc->vc_sw->con_getxy) {
364 p = (u16 *)start;
365 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
366 }
367 }
368 #endif
369 }
370
371 void update_region(struct vc_data *vc, unsigned long start, int count)
372 {
373 WARN_CONSOLE_UNLOCKED();
374
375 if (DO_UPDATE(vc)) {
376 hide_cursor(vc);
377 do_update_region(vc, start, count);
378 set_cursor(vc);
379 }
380 }
381
382 /* Structure of attributes is hardware-dependent */
383
384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
385 u8 _underline, u8 _reverse, u8 _italic)
386 {
387 if (vc->vc_sw->con_build_attr)
388 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
389 _blink, _underline, _reverse, _italic);
390
391 #ifndef VT_BUF_VRAM_ONLY
392 /*
393 * ++roman: I completely changed the attribute format for monochrome
394 * mode (!can_do_color). The formerly used MDA (monochrome display
395 * adapter) format didn't allow the combination of certain effects.
396 * Now the attribute is just a bit vector:
397 * Bit 0..1: intensity (0..2)
398 * Bit 2 : underline
399 * Bit 3 : reverse
400 * Bit 7 : blink
401 */
402 {
403 u8 a = vc->vc_color;
404 if (!vc->vc_can_do_color)
405 return _intensity |
406 (_italic ? 2 : 0) |
407 (_underline ? 4 : 0) |
408 (_reverse ? 8 : 0) |
409 (_blink ? 0x80 : 0);
410 if (_italic)
411 a = (a & 0xF0) | vc->vc_itcolor;
412 else if (_underline)
413 a = (a & 0xf0) | vc->vc_ulcolor;
414 else if (_intensity == 0)
415 a = (a & 0xf0) | vc->vc_ulcolor;
416 if (_reverse)
417 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
418 if (_blink)
419 a ^= 0x80;
420 if (_intensity == 2)
421 a ^= 0x08;
422 if (vc->vc_hi_font_mask == 0x100)
423 a <<= 1;
424 return a;
425 }
426 #else
427 return 0;
428 #endif
429 }
430
431 static void update_attr(struct vc_data *vc)
432 {
433 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
434 vc->vc_blink, vc->vc_underline,
435 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
436 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
437 }
438
439 /* Note: inverting the screen twice should revert to the original state */
440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
441 {
442 unsigned short *p;
443
444 WARN_CONSOLE_UNLOCKED();
445
446 count /= 2;
447 p = screenpos(vc, offset, viewed);
448 if (vc->vc_sw->con_invert_region)
449 vc->vc_sw->con_invert_region(vc, p, count);
450 #ifndef VT_BUF_VRAM_ONLY
451 else {
452 u16 *q = p;
453 int cnt = count;
454 u16 a;
455
456 if (!vc->vc_can_do_color) {
457 while (cnt--) {
458 a = scr_readw(q);
459 a ^= 0x0800;
460 scr_writew(a, q);
461 q++;
462 }
463 } else if (vc->vc_hi_font_mask == 0x100) {
464 while (cnt--) {
465 a = scr_readw(q);
466 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
467 scr_writew(a, q);
468 q++;
469 }
470 } else {
471 while (cnt--) {
472 a = scr_readw(q);
473 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
474 scr_writew(a, q);
475 q++;
476 }
477 }
478 }
479 #endif
480 if (DO_UPDATE(vc))
481 do_update_region(vc, (unsigned long) p, count);
482 }
483
484 /* used by selection: complement pointer position */
485 void complement_pos(struct vc_data *vc, int offset)
486 {
487 static int old_offset = -1;
488 static unsigned short old;
489 static unsigned short oldx, oldy;
490
491 WARN_CONSOLE_UNLOCKED();
492
493 if (old_offset != -1 && old_offset >= 0 &&
494 old_offset < vc->vc_screenbuf_size) {
495 scr_writew(old, screenpos(vc, old_offset, 1));
496 if (DO_UPDATE(vc))
497 vc->vc_sw->con_putc(vc, old, oldy, oldx);
498 }
499
500 old_offset = offset;
501
502 if (offset != -1 && offset >= 0 &&
503 offset < vc->vc_screenbuf_size) {
504 unsigned short new;
505 unsigned short *p;
506 p = screenpos(vc, offset, 1);
507 old = scr_readw(p);
508 new = old ^ vc->vc_complement_mask;
509 scr_writew(new, p);
510 if (DO_UPDATE(vc)) {
511 oldx = (offset >> 1) % vc->vc_cols;
512 oldy = (offset >> 1) / vc->vc_cols;
513 vc->vc_sw->con_putc(vc, new, oldy, oldx);
514 }
515 }
516
517 }
518
519 static void insert_char(struct vc_data *vc, unsigned int nr)
520 {
521 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
522
523 p = q + vc->vc_cols - nr - vc->vc_x;
524 while (--p >= q)
525 scr_writew(scr_readw(p), p + nr);
526 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
527 vc->vc_need_wrap = 0;
528 if (DO_UPDATE(vc)) {
529 unsigned short oldattr = vc->vc_attr;
530 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
531 vc->vc_cols - vc->vc_x - nr);
532 vc->vc_attr = vc->vc_video_erase_char >> 8;
533 while (nr--)
534 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
535 vc->vc_attr = oldattr;
536 }
537 }
538
539 static void delete_char(struct vc_data *vc, unsigned int nr)
540 {
541 unsigned int i = vc->vc_x;
542 unsigned short *p = (unsigned short *)vc->vc_pos;
543
544 while (++i <= vc->vc_cols - nr) {
545 scr_writew(scr_readw(p+nr), p);
546 p++;
547 }
548 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
549 vc->vc_need_wrap = 0;
550 if (DO_UPDATE(vc)) {
551 unsigned short oldattr = vc->vc_attr;
552 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
553 vc->vc_cols - vc->vc_x - nr);
554 vc->vc_attr = vc->vc_video_erase_char >> 8;
555 while (nr--)
556 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
557 vc->vc_cols - 1 - nr);
558 vc->vc_attr = oldattr;
559 }
560 }
561
562 static int softcursor_original;
563
564 static void add_softcursor(struct vc_data *vc)
565 {
566 int i = scr_readw((u16 *) vc->vc_pos);
567 u32 type = vc->vc_cursor_type;
568
569 if (! (type & 0x10)) return;
570 if (softcursor_original != -1) return;
571 softcursor_original = i;
572 i |= ((type >> 8) & 0xff00 );
573 i ^= ((type) & 0xff00 );
574 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
575 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
576 scr_writew(i, (u16 *) vc->vc_pos);
577 if (DO_UPDATE(vc))
578 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
579 }
580
581 static void hide_softcursor(struct vc_data *vc)
582 {
583 if (softcursor_original != -1) {
584 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
585 if (DO_UPDATE(vc))
586 vc->vc_sw->con_putc(vc, softcursor_original,
587 vc->vc_y, vc->vc_x);
588 softcursor_original = -1;
589 }
590 }
591
592 static void hide_cursor(struct vc_data *vc)
593 {
594 if (vc == sel_cons)
595 clear_selection();
596 vc->vc_sw->con_cursor(vc, CM_ERASE);
597 hide_softcursor(vc);
598 }
599
600 static void set_cursor(struct vc_data *vc)
601 {
602 if (!IS_FG(vc) || console_blanked ||
603 vc->vc_mode == KD_GRAPHICS)
604 return;
605 if (vc->vc_deccm) {
606 if (vc == sel_cons)
607 clear_selection();
608 add_softcursor(vc);
609 if ((vc->vc_cursor_type & 0x0f) != 1)
610 vc->vc_sw->con_cursor(vc, CM_DRAW);
611 } else
612 hide_cursor(vc);
613 }
614
615 static void set_origin(struct vc_data *vc)
616 {
617 WARN_CONSOLE_UNLOCKED();
618
619 if (!CON_IS_VISIBLE(vc) ||
620 !vc->vc_sw->con_set_origin ||
621 !vc->vc_sw->con_set_origin(vc))
622 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
623 vc->vc_visible_origin = vc->vc_origin;
624 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
625 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
626 }
627
628 static inline void save_screen(struct vc_data *vc)
629 {
630 WARN_CONSOLE_UNLOCKED();
631
632 if (vc->vc_sw->con_save_screen)
633 vc->vc_sw->con_save_screen(vc);
634 }
635
636 /*
637 * Redrawing of screen
638 */
639
640 static void clear_buffer_attributes(struct vc_data *vc)
641 {
642 unsigned short *p = (unsigned short *)vc->vc_origin;
643 int count = vc->vc_screenbuf_size / 2;
644 int mask = vc->vc_hi_font_mask | 0xff;
645
646 for (; count > 0; count--, p++) {
647 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
648 }
649 }
650
651 void redraw_screen(struct vc_data *vc, int is_switch)
652 {
653 int redraw = 0;
654
655 WARN_CONSOLE_UNLOCKED();
656
657 if (!vc) {
658 /* strange ... */
659 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
660 return;
661 }
662
663 if (is_switch) {
664 struct vc_data *old_vc = vc_cons[fg_console].d;
665 if (old_vc == vc)
666 return;
667 if (!CON_IS_VISIBLE(vc))
668 redraw = 1;
669 *vc->vc_display_fg = vc;
670 fg_console = vc->vc_num;
671 hide_cursor(old_vc);
672 if (!CON_IS_VISIBLE(old_vc)) {
673 save_screen(old_vc);
674 set_origin(old_vc);
675 }
676 } else {
677 hide_cursor(vc);
678 redraw = 1;
679 }
680
681 if (redraw) {
682 int update;
683 int old_was_color = vc->vc_can_do_color;
684
685 set_origin(vc);
686 update = vc->vc_sw->con_switch(vc);
687 set_palette(vc);
688 /*
689 * If console changed from mono<->color, the best we can do
690 * is to clear the buffer attributes. As it currently stands,
691 * rebuilding new attributes from the old buffer is not doable
692 * without overly complex code.
693 */
694 if (old_was_color != vc->vc_can_do_color) {
695 update_attr(vc);
696 clear_buffer_attributes(vc);
697 }
698 if (update && vc->vc_mode != KD_GRAPHICS)
699 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
700 }
701 set_cursor(vc);
702 if (is_switch) {
703 set_leds();
704 compute_shiftstate();
705 }
706 }
707
708 /*
709 * Allocation, freeing and resizing of VTs.
710 */
711
712 int vc_cons_allocated(unsigned int i)
713 {
714 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
715 }
716
717 static void visual_init(struct vc_data *vc, int num, int init)
718 {
719 /* ++Geert: vc->vc_sw->con_init determines console size */
720 if (vc->vc_sw)
721 module_put(vc->vc_sw->owner);
722 vc->vc_sw = conswitchp;
723 #ifndef VT_SINGLE_DRIVER
724 if (con_driver_map[num])
725 vc->vc_sw = con_driver_map[num];
726 #endif
727 __module_get(vc->vc_sw->owner);
728 vc->vc_num = num;
729 vc->vc_display_fg = &master_display_fg;
730 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
731 vc->vc_uni_pagedir = 0;
732 vc->vc_hi_font_mask = 0;
733 vc->vc_complement_mask = 0;
734 vc->vc_can_do_color = 0;
735 vc->vc_sw->con_init(vc, init);
736 if (!vc->vc_complement_mask)
737 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
738 vc->vc_s_complement_mask = vc->vc_complement_mask;
739 vc->vc_size_row = vc->vc_cols << 1;
740 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
741 }
742
743 int vc_allocate(unsigned int currcons) /* return 0 on success */
744 {
745 WARN_CONSOLE_UNLOCKED();
746
747 if (currcons >= MAX_NR_CONSOLES)
748 return -ENXIO;
749 if (!vc_cons[currcons].d) {
750 struct vc_data *vc;
751 struct vt_notifier_param param;
752
753 /* prevent users from taking too much memory */
754 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
755 return -EPERM;
756
757 /* due to the granularity of kmalloc, we waste some memory here */
758 /* the alloc is done in two steps, to optimize the common situation
759 of a 25x80 console (structsize=216, screenbuf_size=4000) */
760 /* although the numbers above are not valid since long ago, the
761 point is still up-to-date and the comment still has its value
762 even if only as a historical artifact. --mj, July 1998 */
763 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
764 if (!vc)
765 return -ENOMEM;
766 vc_cons[currcons].d = vc;
767 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
768 visual_init(vc, currcons, 1);
769 if (!*vc->vc_uni_pagedir_loc)
770 con_set_default_unimap(vc);
771 if (!vc->vc_kmalloced)
772 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
773 if (!vc->vc_screenbuf) {
774 kfree(vc);
775 vc_cons[currcons].d = NULL;
776 return -ENOMEM;
777 }
778 vc->vc_kmalloced = 1;
779 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
780 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
781 }
782 return 0;
783 }
784
785 static inline int resize_screen(struct vc_data *vc, int width, int height,
786 int user)
787 {
788 /* Resizes the resolution of the display adapater */
789 int err = 0;
790
791 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
792 err = vc->vc_sw->con_resize(vc, width, height, user);
793
794 return err;
795 }
796
797 /*
798 * Change # of rows and columns (0 means unchanged/the size of fg_console)
799 * [this is to be used together with some user program
800 * like resize that changes the hardware videomode]
801 */
802 #define VC_RESIZE_MAXCOL (32767)
803 #define VC_RESIZE_MAXROW (32767)
804 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
805 {
806 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
807 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
808 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
809 unsigned int end, user;
810 unsigned short *newscreen;
811
812 WARN_CONSOLE_UNLOCKED();
813
814 if (!vc)
815 return -ENXIO;
816
817 user = vc->vc_resize_user;
818 vc->vc_resize_user = 0;
819
820 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
821 return -EINVAL;
822
823 new_cols = (cols ? cols : vc->vc_cols);
824 new_rows = (lines ? lines : vc->vc_rows);
825 new_row_size = new_cols << 1;
826 new_screen_size = new_row_size * new_rows;
827
828 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
829 return 0;
830
831 newscreen = kmalloc(new_screen_size, GFP_USER);
832 if (!newscreen)
833 return -ENOMEM;
834
835 old_rows = vc->vc_rows;
836 old_cols = vc->vc_cols;
837 old_row_size = vc->vc_size_row;
838 old_screen_size = vc->vc_screenbuf_size;
839
840 err = resize_screen(vc, new_cols, new_rows, user);
841 if (err) {
842 kfree(newscreen);
843 return err;
844 }
845
846 vc->vc_rows = new_rows;
847 vc->vc_cols = new_cols;
848 vc->vc_size_row = new_row_size;
849 vc->vc_screenbuf_size = new_screen_size;
850
851 rlth = min(old_row_size, new_row_size);
852 rrem = new_row_size - rlth;
853 old_origin = vc->vc_origin;
854 new_origin = (long) newscreen;
855 new_scr_end = new_origin + new_screen_size;
856
857 if (vc->vc_y > new_rows) {
858 if (old_rows - vc->vc_y < new_rows) {
859 /*
860 * Cursor near the bottom, copy contents from the
861 * bottom of buffer
862 */
863 old_origin += (old_rows - new_rows) * old_row_size;
864 end = vc->vc_scr_end;
865 } else {
866 /*
867 * Cursor is in no man's land, copy 1/2 screenful
868 * from the top and bottom of cursor position
869 */
870 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
871 end = old_origin + (old_row_size * new_rows);
872 }
873 } else
874 /*
875 * Cursor near the top, copy contents from the top of buffer
876 */
877 end = (old_rows > new_rows) ? old_origin +
878 (old_row_size * new_rows) :
879 vc->vc_scr_end;
880
881 update_attr(vc);
882
883 while (old_origin < end) {
884 scr_memcpyw((unsigned short *) new_origin,
885 (unsigned short *) old_origin, rlth);
886 if (rrem)
887 scr_memsetw((void *)(new_origin + rlth),
888 vc->vc_video_erase_char, rrem);
889 old_origin += old_row_size;
890 new_origin += new_row_size;
891 }
892 if (new_scr_end > new_origin)
893 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
894 new_scr_end - new_origin);
895 if (vc->vc_kmalloced)
896 kfree(vc->vc_screenbuf);
897 vc->vc_screenbuf = newscreen;
898 vc->vc_kmalloced = 1;
899 vc->vc_screenbuf_size = new_screen_size;
900 set_origin(vc);
901
902 /* do part of a reset_terminal() */
903 vc->vc_top = 0;
904 vc->vc_bottom = vc->vc_rows;
905 gotoxy(vc, vc->vc_x, vc->vc_y);
906 save_cur(vc);
907
908 if (vc->vc_tty) {
909 struct winsize ws, *cws = &vc->vc_tty->winsize;
910
911 memset(&ws, 0, sizeof(ws));
912 ws.ws_row = vc->vc_rows;
913 ws.ws_col = vc->vc_cols;
914 ws.ws_ypixel = vc->vc_scan_lines;
915 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
916 vc->vc_tty->pgrp)
917 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
918 *cws = ws;
919 }
920
921 if (CON_IS_VISIBLE(vc))
922 update_screen(vc);
923 return err;
924 }
925
926 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
927 {
928 int rc;
929
930 acquire_console_sem();
931 rc = vc_resize(vc, cols, lines);
932 release_console_sem();
933 return rc;
934 }
935
936 void vc_deallocate(unsigned int currcons)
937 {
938 WARN_CONSOLE_UNLOCKED();
939
940 if (vc_cons_allocated(currcons)) {
941 struct vc_data *vc = vc_cons[currcons].d;
942 struct vt_notifier_param param = { .vc = vc };
943 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
944 vc->vc_sw->con_deinit(vc);
945 put_pid(vc->vt_pid);
946 module_put(vc->vc_sw->owner);
947 if (vc->vc_kmalloced)
948 kfree(vc->vc_screenbuf);
949 if (currcons >= MIN_NR_CONSOLES)
950 kfree(vc);
951 vc_cons[currcons].d = NULL;
952 }
953 }
954
955 /*
956 * VT102 emulator
957 */
958
959 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
960 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
961 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
962
963 #define decarm VC_REPEAT
964 #define decckm VC_CKMODE
965 #define kbdapplic VC_APPLIC
966 #define lnm VC_CRLF
967
968 /*
969 * this is what the terminal answers to a ESC-Z or csi0c query.
970 */
971 #define VT100ID "\033[?1;2c"
972 #define VT102ID "\033[?6c"
973
974 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
975 8,12,10,14, 9,13,11,15 };
976
977 /* the default colour table, for VGA+ colour systems */
978 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
979 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
980 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
981 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
982 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
983 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
984
985 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
986 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
987 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
988
989 /*
990 * gotoxy() must verify all boundaries, because the arguments
991 * might also be negative. If the given position is out of
992 * bounds, the cursor is placed at the nearest margin.
993 */
994 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
995 {
996 int min_y, max_y;
997
998 if (new_x < 0)
999 vc->vc_x = 0;
1000 else {
1001 if (new_x >= vc->vc_cols)
1002 vc->vc_x = vc->vc_cols - 1;
1003 else
1004 vc->vc_x = new_x;
1005 }
1006
1007 if (vc->vc_decom) {
1008 min_y = vc->vc_top;
1009 max_y = vc->vc_bottom;
1010 } else {
1011 min_y = 0;
1012 max_y = vc->vc_rows;
1013 }
1014 if (new_y < min_y)
1015 vc->vc_y = min_y;
1016 else if (new_y >= max_y)
1017 vc->vc_y = max_y - 1;
1018 else
1019 vc->vc_y = new_y;
1020 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1021 vc->vc_need_wrap = 0;
1022 }
1023
1024 /* for absolute user moves, when decom is set */
1025 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1026 {
1027 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1028 }
1029
1030 void scrollback(struct vc_data *vc, int lines)
1031 {
1032 if (!lines)
1033 lines = vc->vc_rows / 2;
1034 scrolldelta(-lines);
1035 }
1036
1037 void scrollfront(struct vc_data *vc, int lines)
1038 {
1039 if (!lines)
1040 lines = vc->vc_rows / 2;
1041 scrolldelta(lines);
1042 }
1043
1044 static void lf(struct vc_data *vc)
1045 {
1046 /* don't scroll if above bottom of scrolling region, or
1047 * if below scrolling region
1048 */
1049 if (vc->vc_y + 1 == vc->vc_bottom)
1050 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1051 else if (vc->vc_y < vc->vc_rows - 1) {
1052 vc->vc_y++;
1053 vc->vc_pos += vc->vc_size_row;
1054 }
1055 vc->vc_need_wrap = 0;
1056 notify_write(vc, '\n');
1057 }
1058
1059 static void ri(struct vc_data *vc)
1060 {
1061 /* don't scroll if below top of scrolling region, or
1062 * if above scrolling region
1063 */
1064 if (vc->vc_y == vc->vc_top)
1065 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1066 else if (vc->vc_y > 0) {
1067 vc->vc_y--;
1068 vc->vc_pos -= vc->vc_size_row;
1069 }
1070 vc->vc_need_wrap = 0;
1071 }
1072
1073 static inline void cr(struct vc_data *vc)
1074 {
1075 vc->vc_pos -= vc->vc_x << 1;
1076 vc->vc_need_wrap = vc->vc_x = 0;
1077 notify_write(vc, '\r');
1078 }
1079
1080 static inline void bs(struct vc_data *vc)
1081 {
1082 if (vc->vc_x) {
1083 vc->vc_pos -= 2;
1084 vc->vc_x--;
1085 vc->vc_need_wrap = 0;
1086 notify_write(vc, '\b');
1087 }
1088 }
1089
1090 static inline void del(struct vc_data *vc)
1091 {
1092 /* ignored */
1093 }
1094
1095 static void csi_J(struct vc_data *vc, int vpar)
1096 {
1097 unsigned int count;
1098 unsigned short * start;
1099
1100 switch (vpar) {
1101 case 0: /* erase from cursor to end of display */
1102 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1103 start = (unsigned short *)vc->vc_pos;
1104 if (DO_UPDATE(vc)) {
1105 /* do in two stages */
1106 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1107 vc->vc_cols - vc->vc_x);
1108 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1109 vc->vc_rows - vc->vc_y - 1,
1110 vc->vc_cols);
1111 }
1112 break;
1113 case 1: /* erase from start to cursor */
1114 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1115 start = (unsigned short *)vc->vc_origin;
1116 if (DO_UPDATE(vc)) {
1117 /* do in two stages */
1118 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1119 vc->vc_cols);
1120 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1121 vc->vc_x + 1);
1122 }
1123 break;
1124 case 2: /* erase whole display */
1125 count = vc->vc_cols * vc->vc_rows;
1126 start = (unsigned short *)vc->vc_origin;
1127 if (DO_UPDATE(vc))
1128 vc->vc_sw->con_clear(vc, 0, 0,
1129 vc->vc_rows,
1130 vc->vc_cols);
1131 break;
1132 default:
1133 return;
1134 }
1135 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1136 vc->vc_need_wrap = 0;
1137 }
1138
1139 static void csi_K(struct vc_data *vc, int vpar)
1140 {
1141 unsigned int count;
1142 unsigned short * start;
1143
1144 switch (vpar) {
1145 case 0: /* erase from cursor to end of line */
1146 count = vc->vc_cols - vc->vc_x;
1147 start = (unsigned short *)vc->vc_pos;
1148 if (DO_UPDATE(vc))
1149 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1150 vc->vc_cols - vc->vc_x);
1151 break;
1152 case 1: /* erase from start of line to cursor */
1153 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1154 count = vc->vc_x + 1;
1155 if (DO_UPDATE(vc))
1156 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1157 vc->vc_x + 1);
1158 break;
1159 case 2: /* erase whole line */
1160 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1161 count = vc->vc_cols;
1162 if (DO_UPDATE(vc))
1163 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1164 vc->vc_cols);
1165 break;
1166 default:
1167 return;
1168 }
1169 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1170 vc->vc_need_wrap = 0;
1171 }
1172
1173 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1174 { /* not vt100? */
1175 int count;
1176
1177 if (!vpar)
1178 vpar++;
1179 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1180
1181 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1182 if (DO_UPDATE(vc))
1183 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1184 vc->vc_need_wrap = 0;
1185 }
1186
1187 static void default_attr(struct vc_data *vc)
1188 {
1189 vc->vc_intensity = 1;
1190 vc->vc_italic = 0;
1191 vc->vc_underline = 0;
1192 vc->vc_reverse = 0;
1193 vc->vc_blink = 0;
1194 vc->vc_color = vc->vc_def_color;
1195 }
1196
1197 /* console_sem is held */
1198 static void csi_m(struct vc_data *vc)
1199 {
1200 int i;
1201
1202 for (i = 0; i <= vc->vc_npar; i++)
1203 switch (vc->vc_par[i]) {
1204 case 0: /* all attributes off */
1205 default_attr(vc);
1206 break;
1207 case 1:
1208 vc->vc_intensity = 2;
1209 break;
1210 case 2:
1211 vc->vc_intensity = 0;
1212 break;
1213 case 3:
1214 vc->vc_italic = 1;
1215 break;
1216 case 4:
1217 vc->vc_underline = 1;
1218 break;
1219 case 5:
1220 vc->vc_blink = 1;
1221 break;
1222 case 7:
1223 vc->vc_reverse = 1;
1224 break;
1225 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1226 * Select primary font, don't display
1227 * control chars if defined, don't set
1228 * bit 8 on output.
1229 */
1230 vc->vc_translate = set_translate(vc->vc_charset == 0
1231 ? vc->vc_G0_charset
1232 : vc->vc_G1_charset, vc);
1233 vc->vc_disp_ctrl = 0;
1234 vc->vc_toggle_meta = 0;
1235 break;
1236 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1237 * Select first alternate font, lets
1238 * chars < 32 be displayed as ROM chars.
1239 */
1240 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1241 vc->vc_disp_ctrl = 1;
1242 vc->vc_toggle_meta = 0;
1243 break;
1244 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1245 * Select second alternate font, toggle
1246 * high bit before displaying as ROM char.
1247 */
1248 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1249 vc->vc_disp_ctrl = 1;
1250 vc->vc_toggle_meta = 1;
1251 break;
1252 case 21:
1253 case 22:
1254 vc->vc_intensity = 1;
1255 break;
1256 case 23:
1257 vc->vc_italic = 0;
1258 break;
1259 case 24:
1260 vc->vc_underline = 0;
1261 break;
1262 case 25:
1263 vc->vc_blink = 0;
1264 break;
1265 case 27:
1266 vc->vc_reverse = 0;
1267 break;
1268 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1269 * Enables underscore, white foreground
1270 * with white underscore (Linux - use
1271 * default foreground).
1272 */
1273 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1274 vc->vc_underline = 1;
1275 break;
1276 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1277 * Disable underline option.
1278 * Reset colour to default? It did this
1279 * before...
1280 */
1281 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1282 vc->vc_underline = 0;
1283 break;
1284 case 49:
1285 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1286 break;
1287 default:
1288 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1289 vc->vc_color = color_table[vc->vc_par[i] - 30]
1290 | (vc->vc_color & 0xf0);
1291 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1292 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1293 | (vc->vc_color & 0x0f);
1294 break;
1295 }
1296 update_attr(vc);
1297 }
1298
1299 static void respond_string(const char *p, struct tty_struct *tty)
1300 {
1301 while (*p) {
1302 tty_insert_flip_char(tty, *p, 0);
1303 p++;
1304 }
1305 con_schedule_flip(tty);
1306 }
1307
1308 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1309 {
1310 char buf[40];
1311
1312 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1313 respond_string(buf, tty);
1314 }
1315
1316 static inline void status_report(struct tty_struct *tty)
1317 {
1318 respond_string("\033[0n", tty); /* Terminal ok */
1319 }
1320
1321 static inline void respond_ID(struct tty_struct * tty)
1322 {
1323 respond_string(VT102ID, tty);
1324 }
1325
1326 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1327 {
1328 char buf[8];
1329
1330 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1331 (char)('!' + mry));
1332 respond_string(buf, tty);
1333 }
1334
1335 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1336 int mouse_reporting(void)
1337 {
1338 return vc_cons[fg_console].d->vc_report_mouse;
1339 }
1340
1341 /* console_sem is held */
1342 static void set_mode(struct vc_data *vc, int on_off)
1343 {
1344 int i;
1345
1346 for (i = 0; i <= vc->vc_npar; i++)
1347 if (vc->vc_ques) {
1348 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1349 case 1: /* Cursor keys send ^[Ox/^[[x */
1350 if (on_off)
1351 set_kbd(vc, decckm);
1352 else
1353 clr_kbd(vc, decckm);
1354 break;
1355 case 3: /* 80/132 mode switch unimplemented */
1356 vc->vc_deccolm = on_off;
1357 #if 0
1358 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1359 /* this alone does not suffice; some user mode
1360 utility has to change the hardware regs */
1361 #endif
1362 break;
1363 case 5: /* Inverted screen on/off */
1364 if (vc->vc_decscnm != on_off) {
1365 vc->vc_decscnm = on_off;
1366 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1367 update_attr(vc);
1368 }
1369 break;
1370 case 6: /* Origin relative/absolute */
1371 vc->vc_decom = on_off;
1372 gotoxay(vc, 0, 0);
1373 break;
1374 case 7: /* Autowrap on/off */
1375 vc->vc_decawm = on_off;
1376 break;
1377 case 8: /* Autorepeat on/off */
1378 if (on_off)
1379 set_kbd(vc, decarm);
1380 else
1381 clr_kbd(vc, decarm);
1382 break;
1383 case 9:
1384 vc->vc_report_mouse = on_off ? 1 : 0;
1385 break;
1386 case 25: /* Cursor on/off */
1387 vc->vc_deccm = on_off;
1388 break;
1389 case 1000:
1390 vc->vc_report_mouse = on_off ? 2 : 0;
1391 break;
1392 }
1393 } else {
1394 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1395 case 3: /* Monitor (display ctrls) */
1396 vc->vc_disp_ctrl = on_off;
1397 break;
1398 case 4: /* Insert Mode on/off */
1399 vc->vc_decim = on_off;
1400 break;
1401 case 20: /* Lf, Enter == CrLf/Lf */
1402 if (on_off)
1403 set_kbd(vc, lnm);
1404 else
1405 clr_kbd(vc, lnm);
1406 break;
1407 }
1408 }
1409 }
1410
1411 /* console_sem is held */
1412 static void setterm_command(struct vc_data *vc)
1413 {
1414 switch(vc->vc_par[0]) {
1415 case 1: /* set color for underline mode */
1416 if (vc->vc_can_do_color &&
1417 vc->vc_par[1] < 16) {
1418 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1419 if (vc->vc_underline)
1420 update_attr(vc);
1421 }
1422 break;
1423 case 2: /* set color for half intensity mode */
1424 if (vc->vc_can_do_color &&
1425 vc->vc_par[1] < 16) {
1426 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1427 if (vc->vc_intensity == 0)
1428 update_attr(vc);
1429 }
1430 break;
1431 case 8: /* store colors as defaults */
1432 vc->vc_def_color = vc->vc_attr;
1433 if (vc->vc_hi_font_mask == 0x100)
1434 vc->vc_def_color >>= 1;
1435 default_attr(vc);
1436 update_attr(vc);
1437 break;
1438 case 9: /* set blanking interval */
1439 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1440 poke_blanked_console();
1441 break;
1442 case 10: /* set bell frequency in Hz */
1443 if (vc->vc_npar >= 1)
1444 vc->vc_bell_pitch = vc->vc_par[1];
1445 else
1446 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1447 break;
1448 case 11: /* set bell duration in msec */
1449 if (vc->vc_npar >= 1)
1450 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1451 vc->vc_par[1] * HZ / 1000 : 0;
1452 else
1453 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1454 break;
1455 case 12: /* bring specified console to the front */
1456 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1457 set_console(vc->vc_par[1] - 1);
1458 break;
1459 case 13: /* unblank the screen */
1460 poke_blanked_console();
1461 break;
1462 case 14: /* set vesa powerdown interval */
1463 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1464 break;
1465 case 15: /* activate the previous console */
1466 set_console(last_console);
1467 break;
1468 }
1469 }
1470
1471 /* console_sem is held */
1472 static void csi_at(struct vc_data *vc, unsigned int nr)
1473 {
1474 if (nr > vc->vc_cols - vc->vc_x)
1475 nr = vc->vc_cols - vc->vc_x;
1476 else if (!nr)
1477 nr = 1;
1478 insert_char(vc, nr);
1479 }
1480
1481 /* console_sem is held */
1482 static void csi_L(struct vc_data *vc, unsigned int nr)
1483 {
1484 if (nr > vc->vc_rows - vc->vc_y)
1485 nr = vc->vc_rows - vc->vc_y;
1486 else if (!nr)
1487 nr = 1;
1488 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1489 vc->vc_need_wrap = 0;
1490 }
1491
1492 /* console_sem is held */
1493 static void csi_P(struct vc_data *vc, unsigned int nr)
1494 {
1495 if (nr > vc->vc_cols - vc->vc_x)
1496 nr = vc->vc_cols - vc->vc_x;
1497 else if (!nr)
1498 nr = 1;
1499 delete_char(vc, nr);
1500 }
1501
1502 /* console_sem is held */
1503 static void csi_M(struct vc_data *vc, unsigned int nr)
1504 {
1505 if (nr > vc->vc_rows - vc->vc_y)
1506 nr = vc->vc_rows - vc->vc_y;
1507 else if (!nr)
1508 nr=1;
1509 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1510 vc->vc_need_wrap = 0;
1511 }
1512
1513 /* console_sem is held (except via vc_init->reset_terminal */
1514 static void save_cur(struct vc_data *vc)
1515 {
1516 vc->vc_saved_x = vc->vc_x;
1517 vc->vc_saved_y = vc->vc_y;
1518 vc->vc_s_intensity = vc->vc_intensity;
1519 vc->vc_s_italic = vc->vc_italic;
1520 vc->vc_s_underline = vc->vc_underline;
1521 vc->vc_s_blink = vc->vc_blink;
1522 vc->vc_s_reverse = vc->vc_reverse;
1523 vc->vc_s_charset = vc->vc_charset;
1524 vc->vc_s_color = vc->vc_color;
1525 vc->vc_saved_G0 = vc->vc_G0_charset;
1526 vc->vc_saved_G1 = vc->vc_G1_charset;
1527 }
1528
1529 /* console_sem is held */
1530 static void restore_cur(struct vc_data *vc)
1531 {
1532 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1533 vc->vc_intensity = vc->vc_s_intensity;
1534 vc->vc_italic = vc->vc_s_italic;
1535 vc->vc_underline = vc->vc_s_underline;
1536 vc->vc_blink = vc->vc_s_blink;
1537 vc->vc_reverse = vc->vc_s_reverse;
1538 vc->vc_charset = vc->vc_s_charset;
1539 vc->vc_color = vc->vc_s_color;
1540 vc->vc_G0_charset = vc->vc_saved_G0;
1541 vc->vc_G1_charset = vc->vc_saved_G1;
1542 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1543 update_attr(vc);
1544 vc->vc_need_wrap = 0;
1545 }
1546
1547 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1548 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1549 ESpalette };
1550
1551 /* console_sem is held (except via vc_init()) */
1552 static void reset_terminal(struct vc_data *vc, int do_clear)
1553 {
1554 vc->vc_top = 0;
1555 vc->vc_bottom = vc->vc_rows;
1556 vc->vc_state = ESnormal;
1557 vc->vc_ques = 0;
1558 vc->vc_translate = set_translate(LAT1_MAP, vc);
1559 vc->vc_G0_charset = LAT1_MAP;
1560 vc->vc_G1_charset = GRAF_MAP;
1561 vc->vc_charset = 0;
1562 vc->vc_need_wrap = 0;
1563 vc->vc_report_mouse = 0;
1564 vc->vc_utf = default_utf8;
1565 vc->vc_utf_count = 0;
1566
1567 vc->vc_disp_ctrl = 0;
1568 vc->vc_toggle_meta = 0;
1569
1570 vc->vc_decscnm = 0;
1571 vc->vc_decom = 0;
1572 vc->vc_decawm = 1;
1573 vc->vc_deccm = 1;
1574 vc->vc_decim = 0;
1575
1576 set_kbd(vc, decarm);
1577 clr_kbd(vc, decckm);
1578 clr_kbd(vc, kbdapplic);
1579 clr_kbd(vc, lnm);
1580 kbd_table[vc->vc_num].lockstate = 0;
1581 kbd_table[vc->vc_num].slockstate = 0;
1582 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1583 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1584 /* do not do set_leds here because this causes an endless tasklet loop
1585 when the keyboard hasn't been initialized yet */
1586
1587 vc->vc_cursor_type = CUR_DEFAULT;
1588 vc->vc_complement_mask = vc->vc_s_complement_mask;
1589
1590 default_attr(vc);
1591 update_attr(vc);
1592
1593 vc->vc_tab_stop[0] = 0x01010100;
1594 vc->vc_tab_stop[1] =
1595 vc->vc_tab_stop[2] =
1596 vc->vc_tab_stop[3] =
1597 vc->vc_tab_stop[4] = 0x01010101;
1598
1599 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1600 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1601
1602 gotoxy(vc, 0, 0);
1603 save_cur(vc);
1604 if (do_clear)
1605 csi_J(vc, 2);
1606 }
1607
1608 /* console_sem is held */
1609 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1610 {
1611 /*
1612 * Control characters can be used in the _middle_
1613 * of an escape sequence.
1614 */
1615 switch (c) {
1616 case 0:
1617 return;
1618 case 7:
1619 if (vc->vc_bell_duration)
1620 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1621 return;
1622 case 8:
1623 bs(vc);
1624 return;
1625 case 9:
1626 vc->vc_pos -= (vc->vc_x << 1);
1627 while (vc->vc_x < vc->vc_cols - 1) {
1628 vc->vc_x++;
1629 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1630 break;
1631 }
1632 vc->vc_pos += (vc->vc_x << 1);
1633 notify_write(vc, '\t');
1634 return;
1635 case 10: case 11: case 12:
1636 lf(vc);
1637 if (!is_kbd(vc, lnm))
1638 return;
1639 case 13:
1640 cr(vc);
1641 return;
1642 case 14:
1643 vc->vc_charset = 1;
1644 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1645 vc->vc_disp_ctrl = 1;
1646 return;
1647 case 15:
1648 vc->vc_charset = 0;
1649 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1650 vc->vc_disp_ctrl = 0;
1651 return;
1652 case 24: case 26:
1653 vc->vc_state = ESnormal;
1654 return;
1655 case 27:
1656 vc->vc_state = ESesc;
1657 return;
1658 case 127:
1659 del(vc);
1660 return;
1661 case 128+27:
1662 vc->vc_state = ESsquare;
1663 return;
1664 }
1665 switch(vc->vc_state) {
1666 case ESesc:
1667 vc->vc_state = ESnormal;
1668 switch (c) {
1669 case '[':
1670 vc->vc_state = ESsquare;
1671 return;
1672 case ']':
1673 vc->vc_state = ESnonstd;
1674 return;
1675 case '%':
1676 vc->vc_state = ESpercent;
1677 return;
1678 case 'E':
1679 cr(vc);
1680 lf(vc);
1681 return;
1682 case 'M':
1683 ri(vc);
1684 return;
1685 case 'D':
1686 lf(vc);
1687 return;
1688 case 'H':
1689 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1690 return;
1691 case 'Z':
1692 respond_ID(tty);
1693 return;
1694 case '7':
1695 save_cur(vc);
1696 return;
1697 case '8':
1698 restore_cur(vc);
1699 return;
1700 case '(':
1701 vc->vc_state = ESsetG0;
1702 return;
1703 case ')':
1704 vc->vc_state = ESsetG1;
1705 return;
1706 case '#':
1707 vc->vc_state = EShash;
1708 return;
1709 case 'c':
1710 reset_terminal(vc, 1);
1711 return;
1712 case '>': /* Numeric keypad */
1713 clr_kbd(vc, kbdapplic);
1714 return;
1715 case '=': /* Appl. keypad */
1716 set_kbd(vc, kbdapplic);
1717 return;
1718 }
1719 return;
1720 case ESnonstd:
1721 if (c=='P') { /* palette escape sequence */
1722 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1723 vc->vc_par[vc->vc_npar] = 0;
1724 vc->vc_npar = 0;
1725 vc->vc_state = ESpalette;
1726 return;
1727 } else if (c=='R') { /* reset palette */
1728 reset_palette(vc);
1729 vc->vc_state = ESnormal;
1730 } else
1731 vc->vc_state = ESnormal;
1732 return;
1733 case ESpalette:
1734 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1735 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1736 if (vc->vc_npar == 7) {
1737 int i = vc->vc_par[0] * 3, j = 1;
1738 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1739 vc->vc_palette[i++] += vc->vc_par[j++];
1740 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1741 vc->vc_palette[i++] += vc->vc_par[j++];
1742 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1743 vc->vc_palette[i] += vc->vc_par[j];
1744 set_palette(vc);
1745 vc->vc_state = ESnormal;
1746 }
1747 } else
1748 vc->vc_state = ESnormal;
1749 return;
1750 case ESsquare:
1751 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1752 vc->vc_par[vc->vc_npar] = 0;
1753 vc->vc_npar = 0;
1754 vc->vc_state = ESgetpars;
1755 if (c == '[') { /* Function key */
1756 vc->vc_state=ESfunckey;
1757 return;
1758 }
1759 vc->vc_ques = (c == '?');
1760 if (vc->vc_ques)
1761 return;
1762 case ESgetpars:
1763 if (c == ';' && vc->vc_npar < NPAR - 1) {
1764 vc->vc_npar++;
1765 return;
1766 } else if (c>='0' && c<='9') {
1767 vc->vc_par[vc->vc_npar] *= 10;
1768 vc->vc_par[vc->vc_npar] += c - '0';
1769 return;
1770 } else
1771 vc->vc_state = ESgotpars;
1772 case ESgotpars:
1773 vc->vc_state = ESnormal;
1774 switch(c) {
1775 case 'h':
1776 set_mode(vc, 1);
1777 return;
1778 case 'l':
1779 set_mode(vc, 0);
1780 return;
1781 case 'c':
1782 if (vc->vc_ques) {
1783 if (vc->vc_par[0])
1784 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1785 else
1786 vc->vc_cursor_type = CUR_DEFAULT;
1787 return;
1788 }
1789 break;
1790 case 'm':
1791 if (vc->vc_ques) {
1792 clear_selection();
1793 if (vc->vc_par[0])
1794 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1795 else
1796 vc->vc_complement_mask = vc->vc_s_complement_mask;
1797 return;
1798 }
1799 break;
1800 case 'n':
1801 if (!vc->vc_ques) {
1802 if (vc->vc_par[0] == 5)
1803 status_report(tty);
1804 else if (vc->vc_par[0] == 6)
1805 cursor_report(vc, tty);
1806 }
1807 return;
1808 }
1809 if (vc->vc_ques) {
1810 vc->vc_ques = 0;
1811 return;
1812 }
1813 switch(c) {
1814 case 'G': case '`':
1815 if (vc->vc_par[0])
1816 vc->vc_par[0]--;
1817 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1818 return;
1819 case 'A':
1820 if (!vc->vc_par[0])
1821 vc->vc_par[0]++;
1822 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1823 return;
1824 case 'B': case 'e':
1825 if (!vc->vc_par[0])
1826 vc->vc_par[0]++;
1827 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1828 return;
1829 case 'C': case 'a':
1830 if (!vc->vc_par[0])
1831 vc->vc_par[0]++;
1832 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1833 return;
1834 case 'D':
1835 if (!vc->vc_par[0])
1836 vc->vc_par[0]++;
1837 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1838 return;
1839 case 'E':
1840 if (!vc->vc_par[0])
1841 vc->vc_par[0]++;
1842 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1843 return;
1844 case 'F':
1845 if (!vc->vc_par[0])
1846 vc->vc_par[0]++;
1847 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1848 return;
1849 case 'd':
1850 if (vc->vc_par[0])
1851 vc->vc_par[0]--;
1852 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1853 return;
1854 case 'H': case 'f':
1855 if (vc->vc_par[0])
1856 vc->vc_par[0]--;
1857 if (vc->vc_par[1])
1858 vc->vc_par[1]--;
1859 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1860 return;
1861 case 'J':
1862 csi_J(vc, vc->vc_par[0]);
1863 return;
1864 case 'K':
1865 csi_K(vc, vc->vc_par[0]);
1866 return;
1867 case 'L':
1868 csi_L(vc, vc->vc_par[0]);
1869 return;
1870 case 'M':
1871 csi_M(vc, vc->vc_par[0]);
1872 return;
1873 case 'P':
1874 csi_P(vc, vc->vc_par[0]);
1875 return;
1876 case 'c':
1877 if (!vc->vc_par[0])
1878 respond_ID(tty);
1879 return;
1880 case 'g':
1881 if (!vc->vc_par[0])
1882 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1883 else if (vc->vc_par[0] == 3) {
1884 vc->vc_tab_stop[0] =
1885 vc->vc_tab_stop[1] =
1886 vc->vc_tab_stop[2] =
1887 vc->vc_tab_stop[3] =
1888 vc->vc_tab_stop[4] = 0;
1889 }
1890 return;
1891 case 'm':
1892 csi_m(vc);
1893 return;
1894 case 'q': /* DECLL - but only 3 leds */
1895 /* map 0,1,2,3 to 0,1,2,4 */
1896 if (vc->vc_par[0] < 4)
1897 setledstate(kbd_table + vc->vc_num,
1898 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1899 return;
1900 case 'r':
1901 if (!vc->vc_par[0])
1902 vc->vc_par[0]++;
1903 if (!vc->vc_par[1])
1904 vc->vc_par[1] = vc->vc_rows;
1905 /* Minimum allowed region is 2 lines */
1906 if (vc->vc_par[0] < vc->vc_par[1] &&
1907 vc->vc_par[1] <= vc->vc_rows) {
1908 vc->vc_top = vc->vc_par[0] - 1;
1909 vc->vc_bottom = vc->vc_par[1];
1910 gotoxay(vc, 0, 0);
1911 }
1912 return;
1913 case 's':
1914 save_cur(vc);
1915 return;
1916 case 'u':
1917 restore_cur(vc);
1918 return;
1919 case 'X':
1920 csi_X(vc, vc->vc_par[0]);
1921 return;
1922 case '@':
1923 csi_at(vc, vc->vc_par[0]);
1924 return;
1925 case ']': /* setterm functions */
1926 setterm_command(vc);
1927 return;
1928 }
1929 return;
1930 case ESpercent:
1931 vc->vc_state = ESnormal;
1932 switch (c) {
1933 case '@': /* defined in ISO 2022 */
1934 vc->vc_utf = 0;
1935 return;
1936 case 'G': /* prelim official escape code */
1937 case '8': /* retained for compatibility */
1938 vc->vc_utf = 1;
1939 return;
1940 }
1941 return;
1942 case ESfunckey:
1943 vc->vc_state = ESnormal;
1944 return;
1945 case EShash:
1946 vc->vc_state = ESnormal;
1947 if (c == '8') {
1948 /* DEC screen alignment test. kludge :-) */
1949 vc->vc_video_erase_char =
1950 (vc->vc_video_erase_char & 0xff00) | 'E';
1951 csi_J(vc, 2);
1952 vc->vc_video_erase_char =
1953 (vc->vc_video_erase_char & 0xff00) | ' ';
1954 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1955 }
1956 return;
1957 case ESsetG0:
1958 if (c == '0')
1959 vc->vc_G0_charset = GRAF_MAP;
1960 else if (c == 'B')
1961 vc->vc_G0_charset = LAT1_MAP;
1962 else if (c == 'U')
1963 vc->vc_G0_charset = IBMPC_MAP;
1964 else if (c == 'K')
1965 vc->vc_G0_charset = USER_MAP;
1966 if (vc->vc_charset == 0)
1967 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1968 vc->vc_state = ESnormal;
1969 return;
1970 case ESsetG1:
1971 if (c == '0')
1972 vc->vc_G1_charset = GRAF_MAP;
1973 else if (c == 'B')
1974 vc->vc_G1_charset = LAT1_MAP;
1975 else if (c == 'U')
1976 vc->vc_G1_charset = IBMPC_MAP;
1977 else if (c == 'K')
1978 vc->vc_G1_charset = USER_MAP;
1979 if (vc->vc_charset == 1)
1980 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1981 vc->vc_state = ESnormal;
1982 return;
1983 default:
1984 vc->vc_state = ESnormal;
1985 }
1986 }
1987
1988 /* This is a temporary buffer used to prepare a tty console write
1989 * so that we can easily avoid touching user space while holding the
1990 * console spinlock. It is allocated in con_init and is shared by
1991 * this code and the vc_screen read/write tty calls.
1992 *
1993 * We have to allocate this statically in the kernel data section
1994 * since console_init (and thus con_init) are called before any
1995 * kernel memory allocation is available.
1996 */
1997 char con_buf[CON_BUF_SIZE];
1998 DEFINE_MUTEX(con_buf_mtx);
1999
2000 /* is_double_width() is based on the wcwidth() implementation by
2001 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2002 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2003 */
2004 struct interval {
2005 uint32_t first;
2006 uint32_t last;
2007 };
2008
2009 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2010 {
2011 int min = 0;
2012 int mid;
2013
2014 if (ucs < table[0].first || ucs > table[max].last)
2015 return 0;
2016 while (max >= min) {
2017 mid = (min + max) / 2;
2018 if (ucs > table[mid].last)
2019 min = mid + 1;
2020 else if (ucs < table[mid].first)
2021 max = mid - 1;
2022 else
2023 return 1;
2024 }
2025 return 0;
2026 }
2027
2028 static int is_double_width(uint32_t ucs)
2029 {
2030 static const struct interval double_width[] = {
2031 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2032 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2033 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2034 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2035 };
2036 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2037 }
2038
2039 /* acquires console_sem */
2040 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2041 {
2042 #ifdef VT_BUF_VRAM_ONLY
2043 #define FLUSH do { } while(0);
2044 #else
2045 #define FLUSH if (draw_x >= 0) { \
2046 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2047 draw_x = -1; \
2048 }
2049 #endif
2050
2051 int c, tc, ok, n = 0, draw_x = -1;
2052 unsigned int currcons;
2053 unsigned long draw_from = 0, draw_to = 0;
2054 struct vc_data *vc;
2055 unsigned char vc_attr;
2056 uint8_t rescan;
2057 uint8_t inverse;
2058 uint8_t width;
2059 u16 himask, charmask;
2060 const unsigned char *orig_buf = NULL;
2061 int orig_count;
2062
2063 if (in_interrupt())
2064 return count;
2065
2066 might_sleep();
2067
2068 acquire_console_sem();
2069 vc = tty->driver_data;
2070 if (vc == NULL) {
2071 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2072 release_console_sem();
2073 return 0;
2074 }
2075
2076 currcons = vc->vc_num;
2077 if (!vc_cons_allocated(currcons)) {
2078 /* could this happen? */
2079 static int error = 0;
2080 if (!error) {
2081 error = 1;
2082 printk("con_write: tty %d not allocated\n", currcons+1);
2083 }
2084 release_console_sem();
2085 return 0;
2086 }
2087 release_console_sem();
2088
2089 orig_buf = buf;
2090 orig_count = count;
2091
2092 /* At this point 'buf' is guaranteed to be a kernel buffer
2093 * and therefore no access to userspace (and therefore sleeping)
2094 * will be needed. The con_buf_mtx serializes all tty based
2095 * console rendering and vcs write/read operations. We hold
2096 * the console spinlock during the entire write.
2097 */
2098
2099 acquire_console_sem();
2100
2101 vc = tty->driver_data;
2102 if (vc == NULL) {
2103 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2104 release_console_sem();
2105 goto out;
2106 }
2107
2108 himask = vc->vc_hi_font_mask;
2109 charmask = himask ? 0x1ff : 0xff;
2110
2111 /* undraw cursor first */
2112 if (IS_FG(vc))
2113 hide_cursor(vc);
2114
2115 while (!tty->stopped && count) {
2116 int orig = *buf;
2117 c = orig;
2118 buf++;
2119 n++;
2120 count--;
2121 rescan = 0;
2122 inverse = 0;
2123 width = 1;
2124
2125 /* Do no translation at all in control states */
2126 if (vc->vc_state != ESnormal) {
2127 tc = c;
2128 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2129 /* Combine UTF-8 into Unicode in vc_utf_char.
2130 * vc_utf_count is the number of continuation bytes still
2131 * expected to arrive.
2132 * vc_npar is the number of continuation bytes arrived so
2133 * far
2134 */
2135 rescan_last_byte:
2136 if ((c & 0xc0) == 0x80) {
2137 /* Continuation byte received */
2138 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2139 if (vc->vc_utf_count) {
2140 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2141 vc->vc_npar++;
2142 if (--vc->vc_utf_count) {
2143 /* Still need some bytes */
2144 continue;
2145 }
2146 /* Got a whole character */
2147 c = vc->vc_utf_char;
2148 /* Reject overlong sequences */
2149 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2150 c > utf8_length_changes[vc->vc_npar])
2151 c = 0xfffd;
2152 } else {
2153 /* Unexpected continuation byte */
2154 vc->vc_utf_count = 0;
2155 c = 0xfffd;
2156 }
2157 } else {
2158 /* Single ASCII byte or first byte of a sequence received */
2159 if (vc->vc_utf_count) {
2160 /* Continuation byte expected */
2161 rescan = 1;
2162 vc->vc_utf_count = 0;
2163 c = 0xfffd;
2164 } else if (c > 0x7f) {
2165 /* First byte of a multibyte sequence received */
2166 vc->vc_npar = 0;
2167 if ((c & 0xe0) == 0xc0) {
2168 vc->vc_utf_count = 1;
2169 vc->vc_utf_char = (c & 0x1f);
2170 } else if ((c & 0xf0) == 0xe0) {
2171 vc->vc_utf_count = 2;
2172 vc->vc_utf_char = (c & 0x0f);
2173 } else if ((c & 0xf8) == 0xf0) {
2174 vc->vc_utf_count = 3;
2175 vc->vc_utf_char = (c & 0x07);
2176 } else if ((c & 0xfc) == 0xf8) {
2177 vc->vc_utf_count = 4;
2178 vc->vc_utf_char = (c & 0x03);
2179 } else if ((c & 0xfe) == 0xfc) {
2180 vc->vc_utf_count = 5;
2181 vc->vc_utf_char = (c & 0x01);
2182 } else {
2183 /* 254 and 255 are invalid */
2184 c = 0xfffd;
2185 }
2186 if (vc->vc_utf_count) {
2187 /* Still need some bytes */
2188 continue;
2189 }
2190 }
2191 /* Nothing to do if an ASCII byte was received */
2192 }
2193 /* End of UTF-8 decoding. */
2194 /* c is the received character, or U+FFFD for invalid sequences. */
2195 /* Replace invalid Unicode code points with U+FFFD too */
2196 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2197 c = 0xfffd;
2198 tc = c;
2199 } else { /* no utf or alternate charset mode */
2200 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2201 }
2202
2203 /* If the original code was a control character we
2204 * only allow a glyph to be displayed if the code is
2205 * not normally used (such as for cursor movement) or
2206 * if the disp_ctrl mode has been explicitly enabled.
2207 * Certain characters (as given by the CTRL_ALWAYS
2208 * bitmap) are always displayed as control characters,
2209 * as the console would be pretty useless without
2210 * them; to display an arbitrary font position use the
2211 * direct-to-font zone in UTF-8 mode.
2212 */
2213 ok = tc && (c >= 32 ||
2214 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2215 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2216 && (c != 127 || vc->vc_disp_ctrl)
2217 && (c != 128+27);
2218
2219 if (vc->vc_state == ESnormal && ok) {
2220 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2221 if (is_double_width(c))
2222 width = 2;
2223 }
2224 /* Now try to find out how to display it */
2225 tc = conv_uni_to_pc(vc, tc);
2226 if (tc & ~charmask) {
2227 if (tc == -1 || tc == -2) {
2228 continue; /* nothing to display */
2229 }
2230 /* Glyph not found */
2231 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2232 /* In legacy mode use the glyph we get by a 1:1 mapping.
2233 This would make absolutely no sense with Unicode in mind,
2234 but do this for ASCII characters since a font may lack
2235 Unicode mapping info and we don't want to end up with
2236 having question marks only. */
2237 tc = c;
2238 } else {
2239 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2240 tc = conv_uni_to_pc(vc, 0xfffd);
2241 if (tc < 0) {
2242 inverse = 1;
2243 tc = conv_uni_to_pc(vc, '?');
2244 if (tc < 0) tc = '?';
2245 }
2246 }
2247 }
2248
2249 if (!inverse) {
2250 vc_attr = vc->vc_attr;
2251 } else {
2252 /* invert vc_attr */
2253 if (!vc->vc_can_do_color) {
2254 vc_attr = (vc->vc_attr) ^ 0x08;
2255 } else if (vc->vc_hi_font_mask == 0x100) {
2256 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2257 } else {
2258 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2259 }
2260 FLUSH
2261 }
2262
2263 while (1) {
2264 if (vc->vc_need_wrap || vc->vc_decim)
2265 FLUSH
2266 if (vc->vc_need_wrap) {
2267 cr(vc);
2268 lf(vc);
2269 }
2270 if (vc->vc_decim)
2271 insert_char(vc, 1);
2272 scr_writew(himask ?
2273 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2274 (vc_attr << 8) + tc,
2275 (u16 *) vc->vc_pos);
2276 if (DO_UPDATE(vc) && draw_x < 0) {
2277 draw_x = vc->vc_x;
2278 draw_from = vc->vc_pos;
2279 }
2280 if (vc->vc_x == vc->vc_cols - 1) {
2281 vc->vc_need_wrap = vc->vc_decawm;
2282 draw_to = vc->vc_pos + 2;
2283 } else {
2284 vc->vc_x++;
2285 draw_to = (vc->vc_pos += 2);
2286 }
2287
2288 if (!--width) break;
2289
2290 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2291 if (tc < 0) tc = ' ';
2292 }
2293 notify_write(vc, c);
2294
2295 if (inverse) {
2296 FLUSH
2297 }
2298
2299 if (rescan) {
2300 rescan = 0;
2301 inverse = 0;
2302 width = 1;
2303 c = orig;
2304 goto rescan_last_byte;
2305 }
2306 continue;
2307 }
2308 FLUSH
2309 do_con_trol(tty, vc, orig);
2310 }
2311 FLUSH
2312 console_conditional_schedule();
2313 release_console_sem();
2314
2315 out:
2316 notify_update(vc);
2317 return n;
2318 #undef FLUSH
2319 }
2320
2321 /*
2322 * This is the console switching callback.
2323 *
2324 * Doing console switching in a process context allows
2325 * us to do the switches asynchronously (needed when we want
2326 * to switch due to a keyboard interrupt). Synchronization
2327 * with other console code and prevention of re-entrancy is
2328 * ensured with console_sem.
2329 */
2330 static void console_callback(struct work_struct *ignored)
2331 {
2332 acquire_console_sem();
2333
2334 if (want_console >= 0) {
2335 if (want_console != fg_console &&
2336 vc_cons_allocated(want_console)) {
2337 hide_cursor(vc_cons[fg_console].d);
2338 change_console(vc_cons[want_console].d);
2339 /* we only changed when the console had already
2340 been allocated - a new console is not created
2341 in an interrupt routine */
2342 }
2343 want_console = -1;
2344 }
2345 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2346 do_poke_blanked_console = 0;
2347 poke_blanked_console();
2348 }
2349 if (scrollback_delta) {
2350 struct vc_data *vc = vc_cons[fg_console].d;
2351 clear_selection();
2352 if (vc->vc_mode == KD_TEXT)
2353 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2354 scrollback_delta = 0;
2355 }
2356 if (blank_timer_expired) {
2357 do_blank_screen(0);
2358 blank_timer_expired = 0;
2359 }
2360 notify_update(vc_cons[fg_console].d);
2361
2362 release_console_sem();
2363 }
2364
2365 int set_console(int nr)
2366 {
2367 struct vc_data *vc = vc_cons[fg_console].d;
2368
2369 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2370 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2371
2372 /*
2373 * Console switch will fail in console_callback() or
2374 * change_console() so there is no point scheduling
2375 * the callback
2376 *
2377 * Existing set_console() users don't check the return
2378 * value so this shouldn't break anything
2379 */
2380 return -EINVAL;
2381 }
2382
2383 want_console = nr;
2384 schedule_console_callback();
2385
2386 return 0;
2387 }
2388
2389 struct tty_driver *console_driver;
2390
2391 #ifdef CONFIG_VT_CONSOLE
2392
2393 /*
2394 * Console on virtual terminal
2395 *
2396 * The console must be locked when we get here.
2397 */
2398
2399 static void vt_console_print(struct console *co, const char *b, unsigned count)
2400 {
2401 struct vc_data *vc = vc_cons[fg_console].d;
2402 unsigned char c;
2403 static unsigned long printing;
2404 const ushort *start;
2405 ushort cnt = 0;
2406 ushort myx;
2407
2408 /* console busy or not yet initialized */
2409 if (!printable || test_and_set_bit(0, &printing))
2410 return;
2411
2412 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2413 vc = vc_cons[kmsg_redirect - 1].d;
2414
2415 /* read `x' only after setting currcons properly (otherwise
2416 the `x' macro will read the x of the foreground console). */
2417 myx = vc->vc_x;
2418
2419 if (!vc_cons_allocated(fg_console)) {
2420 /* impossible */
2421 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2422 goto quit;
2423 }
2424
2425 if (vc->vc_mode != KD_TEXT)
2426 goto quit;
2427
2428 /* undraw cursor first */
2429 if (IS_FG(vc))
2430 hide_cursor(vc);
2431
2432 start = (ushort *)vc->vc_pos;
2433
2434 /* Contrived structure to try to emulate original need_wrap behaviour
2435 * Problems caused when we have need_wrap set on '\n' character */
2436 while (count--) {
2437 c = *b++;
2438 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2439 if (cnt > 0) {
2440 if (CON_IS_VISIBLE(vc))
2441 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2442 vc->vc_x += cnt;
2443 if (vc->vc_need_wrap)
2444 vc->vc_x--;
2445 cnt = 0;
2446 }
2447 if (c == 8) { /* backspace */
2448 bs(vc);
2449 start = (ushort *)vc->vc_pos;
2450 myx = vc->vc_x;
2451 continue;
2452 }
2453 if (c != 13)
2454 lf(vc);
2455 cr(vc);
2456 start = (ushort *)vc->vc_pos;
2457 myx = vc->vc_x;
2458 if (c == 10 || c == 13)
2459 continue;
2460 }
2461 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2462 notify_write(vc, c);
2463 cnt++;
2464 if (myx == vc->vc_cols - 1) {
2465 vc->vc_need_wrap = 1;
2466 continue;
2467 }
2468 vc->vc_pos += 2;
2469 myx++;
2470 }
2471 if (cnt > 0) {
2472 if (CON_IS_VISIBLE(vc))
2473 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2474 vc->vc_x += cnt;
2475 if (vc->vc_x == vc->vc_cols) {
2476 vc->vc_x--;
2477 vc->vc_need_wrap = 1;
2478 }
2479 }
2480 set_cursor(vc);
2481 notify_update(vc);
2482
2483 quit:
2484 clear_bit(0, &printing);
2485 }
2486
2487 static struct tty_driver *vt_console_device(struct console *c, int *index)
2488 {
2489 *index = c->index ? c->index-1 : fg_console;
2490 return console_driver;
2491 }
2492
2493 static struct console vt_console_driver = {
2494 .name = "tty",
2495 .write = vt_console_print,
2496 .device = vt_console_device,
2497 .unblank = unblank_screen,
2498 .flags = CON_PRINTBUFFER,
2499 .index = -1,
2500 };
2501 #endif
2502
2503 /*
2504 * Handling of Linux-specific VC ioctls
2505 */
2506
2507 /*
2508 * Generally a bit racy with respect to console_sem().
2509 *
2510 * There are some functions which don't need it.
2511 *
2512 * There are some functions which can sleep for arbitrary periods
2513 * (paste_selection) but we don't need the lock there anyway.
2514 *
2515 * set_selection has locking, and definitely needs it
2516 */
2517
2518 int tioclinux(struct tty_struct *tty, unsigned long arg)
2519 {
2520 char type, data;
2521 char __user *p = (char __user *)arg;
2522 int lines;
2523 int ret;
2524
2525 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2526 return -EINVAL;
2527 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2528 return -EPERM;
2529 if (get_user(type, p))
2530 return -EFAULT;
2531 ret = 0;
2532 switch (type)
2533 {
2534 case TIOCL_SETSEL:
2535 acquire_console_sem();
2536 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2537 release_console_sem();
2538 break;
2539 case TIOCL_PASTESEL:
2540 ret = paste_selection(tty);
2541 break;
2542 case TIOCL_UNBLANKSCREEN:
2543 acquire_console_sem();
2544 unblank_screen();
2545 release_console_sem();
2546 break;
2547 case TIOCL_SELLOADLUT:
2548 ret = sel_loadlut(p);
2549 break;
2550 case TIOCL_GETSHIFTSTATE:
2551
2552 /*
2553 * Make it possible to react to Shift+Mousebutton.
2554 * Note that 'shift_state' is an undocumented
2555 * kernel-internal variable; programs not closely
2556 * related to the kernel should not use this.
2557 */
2558 data = shift_state;
2559 ret = __put_user(data, p);
2560 break;
2561 case TIOCL_GETMOUSEREPORTING:
2562 data = mouse_reporting();
2563 ret = __put_user(data, p);
2564 break;
2565 case TIOCL_SETVESABLANK:
2566 ret = set_vesa_blanking(p);
2567 break;
2568 case TIOCL_GETKMSGREDIRECT:
2569 data = kmsg_redirect;
2570 ret = __put_user(data, p);
2571 break;
2572 case TIOCL_SETKMSGREDIRECT:
2573 if (!capable(CAP_SYS_ADMIN)) {
2574 ret = -EPERM;
2575 } else {
2576 if (get_user(data, p+1))
2577 ret = -EFAULT;
2578 else
2579 kmsg_redirect = data;
2580 }
2581 break;
2582 case TIOCL_GETFGCONSOLE:
2583 ret = fg_console;
2584 break;
2585 case TIOCL_SCROLLCONSOLE:
2586 if (get_user(lines, (s32 __user *)(p+4))) {
2587 ret = -EFAULT;
2588 } else {
2589 scrollfront(vc_cons[fg_console].d, lines);
2590 ret = 0;
2591 }
2592 break;
2593 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2594 acquire_console_sem();
2595 ignore_poke = 1;
2596 do_blank_screen(0);
2597 release_console_sem();
2598 break;
2599 case TIOCL_BLANKEDSCREEN:
2600 ret = console_blanked;
2601 break;
2602 default:
2603 ret = -EINVAL;
2604 break;
2605 }
2606 return ret;
2607 }
2608
2609 /*
2610 * /dev/ttyN handling
2611 */
2612
2613 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2614 {
2615 int retval;
2616
2617 retval = do_con_write(tty, buf, count);
2618 con_flush_chars(tty);
2619
2620 return retval;
2621 }
2622
2623 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2624 {
2625 if (in_interrupt())
2626 return; /* n_r3964 calls put_char() from interrupt context */
2627 do_con_write(tty, &ch, 1);
2628 }
2629
2630 static int con_write_room(struct tty_struct *tty)
2631 {
2632 if (tty->stopped)
2633 return 0;
2634 return 4096; /* No limit, really; we're not buffering */
2635 }
2636
2637 static int con_chars_in_buffer(struct tty_struct *tty)
2638 {
2639 return 0; /* we're not buffering */
2640 }
2641
2642 /*
2643 * con_throttle and con_unthrottle are only used for
2644 * paste_selection(), which has to stuff in a large number of
2645 * characters...
2646 */
2647 static void con_throttle(struct tty_struct *tty)
2648 {
2649 }
2650
2651 static void con_unthrottle(struct tty_struct *tty)
2652 {
2653 struct vc_data *vc = tty->driver_data;
2654
2655 wake_up_interruptible(&vc->paste_wait);
2656 }
2657
2658 /*
2659 * Turn the Scroll-Lock LED on when the tty is stopped
2660 */
2661 static void con_stop(struct tty_struct *tty)
2662 {
2663 int console_num;
2664 if (!tty)
2665 return;
2666 console_num = tty->index;
2667 if (!vc_cons_allocated(console_num))
2668 return;
2669 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2670 set_leds();
2671 }
2672
2673 /*
2674 * Turn the Scroll-Lock LED off when the console is started
2675 */
2676 static void con_start(struct tty_struct *tty)
2677 {
2678 int console_num;
2679 if (!tty)
2680 return;
2681 console_num = tty->index;
2682 if (!vc_cons_allocated(console_num))
2683 return;
2684 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2685 set_leds();
2686 }
2687
2688 static void con_flush_chars(struct tty_struct *tty)
2689 {
2690 struct vc_data *vc;
2691
2692 if (in_interrupt()) /* from flush_to_ldisc */
2693 return;
2694
2695 /* if we race with con_close(), vt may be null */
2696 acquire_console_sem();
2697 vc = tty->driver_data;
2698 if (vc)
2699 set_cursor(vc);
2700 release_console_sem();
2701 }
2702
2703 /*
2704 * Allocate the console screen memory.
2705 */
2706 static int con_open(struct tty_struct *tty, struct file *filp)
2707 {
2708 unsigned int currcons = tty->index;
2709 int ret = 0;
2710
2711 acquire_console_sem();
2712 if (tty->driver_data == NULL) {
2713 ret = vc_allocate(currcons);
2714 if (ret == 0) {
2715 struct vc_data *vc = vc_cons[currcons].d;
2716 tty->driver_data = vc;
2717 vc->vc_tty = tty;
2718
2719 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2720 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2721 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2722 }
2723 release_console_sem();
2724 vcs_make_sysfs(tty);
2725 return ret;
2726 }
2727 }
2728 release_console_sem();
2729 return ret;
2730 }
2731
2732 /*
2733 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2734 * and taking a ref against the tty while we're in the process of forgetting
2735 * about it and cleaning things up.
2736 *
2737 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2738 */
2739 static void con_close(struct tty_struct *tty, struct file *filp)
2740 {
2741 mutex_lock(&tty_mutex);
2742 acquire_console_sem();
2743 if (tty && tty->count == 1) {
2744 struct vc_data *vc = tty->driver_data;
2745
2746 if (vc)
2747 vc->vc_tty = NULL;
2748 tty->driver_data = NULL;
2749 release_console_sem();
2750 vcs_remove_sysfs(tty);
2751 mutex_unlock(&tty_mutex);
2752 /*
2753 * tty_mutex is released, but we still hold BKL, so there is
2754 * still exclusion against init_dev()
2755 */
2756 return;
2757 }
2758 release_console_sem();
2759 mutex_unlock(&tty_mutex);
2760 }
2761
2762 static int default_italic_color = 2; // green (ASCII)
2763 static int default_underline_color = 3; // cyan (ASCII)
2764 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2765 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2766
2767 static void vc_init(struct vc_data *vc, unsigned int rows,
2768 unsigned int cols, int do_clear)
2769 {
2770 int j, k ;
2771
2772 vc->vc_cols = cols;
2773 vc->vc_rows = rows;
2774 vc->vc_size_row = cols << 1;
2775 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2776
2777 set_origin(vc);
2778 vc->vc_pos = vc->vc_origin;
2779 reset_vc(vc);
2780 for (j=k=0; j<16; j++) {
2781 vc->vc_palette[k++] = default_red[j] ;
2782 vc->vc_palette[k++] = default_grn[j] ;
2783 vc->vc_palette[k++] = default_blu[j] ;
2784 }
2785 vc->vc_def_color = 0x07; /* white */
2786 vc->vc_ulcolor = default_underline_color;
2787 vc->vc_itcolor = default_italic_color;
2788 vc->vc_halfcolor = 0x08; /* grey */
2789 init_waitqueue_head(&vc->paste_wait);
2790 reset_terminal(vc, do_clear);
2791 }
2792
2793 /*
2794 * This routine initializes console interrupts, and does nothing
2795 * else. If you want the screen to clear, call tty_write with
2796 * the appropriate escape-sequence.
2797 */
2798
2799 static int __init con_init(void)
2800 {
2801 const char *display_desc = NULL;
2802 struct vc_data *vc;
2803 unsigned int currcons = 0, i;
2804
2805 acquire_console_sem();
2806
2807 if (conswitchp)
2808 display_desc = conswitchp->con_startup();
2809 if (!display_desc) {
2810 fg_console = 0;
2811 release_console_sem();
2812 return 0;
2813 }
2814
2815 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2816 struct con_driver *con_driver = &registered_con_driver[i];
2817
2818 if (con_driver->con == NULL) {
2819 con_driver->con = conswitchp;
2820 con_driver->desc = display_desc;
2821 con_driver->flag = CON_DRIVER_FLAG_INIT;
2822 con_driver->first = 0;
2823 con_driver->last = MAX_NR_CONSOLES - 1;
2824 break;
2825 }
2826 }
2827
2828 for (i = 0; i < MAX_NR_CONSOLES; i++)
2829 con_driver_map[i] = conswitchp;
2830
2831 if (blankinterval) {
2832 blank_state = blank_normal_wait;
2833 mod_timer(&console_timer, jiffies + blankinterval);
2834 }
2835
2836 /*
2837 * kmalloc is not running yet - we use the bootmem allocator.
2838 */
2839 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2840 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2841 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2842 visual_init(vc, currcons, 1);
2843 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2844 vc->vc_kmalloced = 0;
2845 vc_init(vc, vc->vc_rows, vc->vc_cols,
2846 currcons || !vc->vc_sw->con_save_screen);
2847 }
2848 currcons = fg_console = 0;
2849 master_display_fg = vc = vc_cons[currcons].d;
2850 set_origin(vc);
2851 save_screen(vc);
2852 gotoxy(vc, vc->vc_x, vc->vc_y);
2853 csi_J(vc, 0);
2854 update_screen(vc);
2855 printk("Console: %s %s %dx%d",
2856 vc->vc_can_do_color ? "colour" : "mono",
2857 display_desc, vc->vc_cols, vc->vc_rows);
2858 printable = 1;
2859 printk("\n");
2860
2861 release_console_sem();
2862
2863 #ifdef CONFIG_VT_CONSOLE
2864 register_console(&vt_console_driver);
2865 #endif
2866 return 0;
2867 }
2868 console_initcall(con_init);
2869
2870 static const struct tty_operations con_ops = {
2871 .open = con_open,
2872 .close = con_close,
2873 .write = con_write,
2874 .write_room = con_write_room,
2875 .put_char = con_put_char,
2876 .flush_chars = con_flush_chars,
2877 .chars_in_buffer = con_chars_in_buffer,
2878 .ioctl = vt_ioctl,
2879 .stop = con_stop,
2880 .start = con_start,
2881 .throttle = con_throttle,
2882 .unthrottle = con_unthrottle,
2883 };
2884
2885 int __init vty_init(void)
2886 {
2887 vcs_init();
2888
2889 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2890 if (!console_driver)
2891 panic("Couldn't allocate console driver\n");
2892 console_driver->owner = THIS_MODULE;
2893 console_driver->name = "tty";
2894 console_driver->name_base = 1;
2895 console_driver->major = TTY_MAJOR;
2896 console_driver->minor_start = 1;
2897 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2898 console_driver->init_termios = tty_std_termios;
2899 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2900 tty_set_operations(console_driver, &con_ops);
2901 if (tty_register_driver(console_driver))
2902 panic("Couldn't register console driver\n");
2903
2904 kbd_init();
2905 console_map_init();
2906 #ifdef CONFIG_PROM_CONSOLE
2907 prom_con_init();
2908 #endif
2909 #ifdef CONFIG_MDA_CONSOLE
2910 mda_console_init();
2911 #endif
2912 return 0;
2913 }
2914
2915 #ifndef VT_SINGLE_DRIVER
2916 #include <linux/device.h>
2917
2918 static struct class *vtconsole_class;
2919
2920 static int bind_con_driver(const struct consw *csw, int first, int last,
2921 int deflt)
2922 {
2923 struct module *owner = csw->owner;
2924 const char *desc = NULL;
2925 struct con_driver *con_driver;
2926 int i, j = -1, k = -1, retval = -ENODEV;
2927
2928 if (!try_module_get(owner))
2929 return -ENODEV;
2930
2931 acquire_console_sem();
2932
2933 /* check if driver is registered */
2934 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2935 con_driver = &registered_con_driver[i];
2936
2937 if (con_driver->con == csw) {
2938 desc = con_driver->desc;
2939 retval = 0;
2940 break;
2941 }
2942 }
2943
2944 if (retval)
2945 goto err;
2946
2947 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2948 csw->con_startup();
2949 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2950 }
2951
2952 if (deflt) {
2953 if (conswitchp)
2954 module_put(conswitchp->owner);
2955
2956 __module_get(owner);
2957 conswitchp = csw;
2958 }
2959
2960 first = max(first, con_driver->first);
2961 last = min(last, con_driver->last);
2962
2963 for (i = first; i <= last; i++) {
2964 int old_was_color;
2965 struct vc_data *vc = vc_cons[i].d;
2966
2967 if (con_driver_map[i])
2968 module_put(con_driver_map[i]->owner);
2969 __module_get(owner);
2970 con_driver_map[i] = csw;
2971
2972 if (!vc || !vc->vc_sw)
2973 continue;
2974
2975 j = i;
2976
2977 if (CON_IS_VISIBLE(vc)) {
2978 k = i;
2979 save_screen(vc);
2980 }
2981
2982 old_was_color = vc->vc_can_do_color;
2983 vc->vc_sw->con_deinit(vc);
2984 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2985 visual_init(vc, i, 0);
2986 set_origin(vc);
2987 update_attr(vc);
2988
2989 /* If the console changed between mono <-> color, then
2990 * the attributes in the screenbuf will be wrong. The
2991 * following resets all attributes to something sane.
2992 */
2993 if (old_was_color != vc->vc_can_do_color)
2994 clear_buffer_attributes(vc);
2995 }
2996
2997 printk("Console: switching ");
2998 if (!deflt)
2999 printk("consoles %d-%d ", first+1, last+1);
3000 if (j >= 0) {
3001 struct vc_data *vc = vc_cons[j].d;
3002
3003 printk("to %s %s %dx%d\n",
3004 vc->vc_can_do_color ? "colour" : "mono",
3005 desc, vc->vc_cols, vc->vc_rows);
3006
3007 if (k >= 0) {
3008 vc = vc_cons[k].d;
3009 update_screen(vc);
3010 }
3011 } else
3012 printk("to %s\n", desc);
3013
3014 retval = 0;
3015 err:
3016 release_console_sem();
3017 module_put(owner);
3018 return retval;
3019 };
3020
3021 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3022 static int con_is_graphics(const struct consw *csw, int first, int last)
3023 {
3024 int i, retval = 0;
3025
3026 for (i = first; i <= last; i++) {
3027 struct vc_data *vc = vc_cons[i].d;
3028
3029 if (vc && vc->vc_mode == KD_GRAPHICS) {
3030 retval = 1;
3031 break;
3032 }
3033 }
3034
3035 return retval;
3036 }
3037
3038 /**
3039 * unbind_con_driver - unbind a console driver
3040 * @csw: pointer to console driver to unregister
3041 * @first: first in range of consoles that @csw should be unbound from
3042 * @last: last in range of consoles that @csw should be unbound from
3043 * @deflt: should next bound console driver be default after @csw is unbound?
3044 *
3045 * To unbind a driver from all possible consoles, pass 0 as @first and
3046 * %MAX_NR_CONSOLES as @last.
3047 *
3048 * @deflt controls whether the console that ends up replacing @csw should be
3049 * the default console.
3050 *
3051 * RETURNS:
3052 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3053 * or 0 on success.
3054 */
3055 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3056 {
3057 struct module *owner = csw->owner;
3058 const struct consw *defcsw = NULL;
3059 struct con_driver *con_driver = NULL, *con_back = NULL;
3060 int i, retval = -ENODEV;
3061
3062 if (!try_module_get(owner))
3063 return -ENODEV;
3064
3065 acquire_console_sem();
3066
3067 /* check if driver is registered and if it is unbindable */
3068 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3069 con_driver = &registered_con_driver[i];
3070
3071 if (con_driver->con == csw &&
3072 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3073 retval = 0;
3074 break;
3075 }
3076 }
3077
3078 if (retval) {
3079 release_console_sem();
3080 goto err;
3081 }
3082
3083 retval = -ENODEV;
3084
3085 /* check if backup driver exists */
3086 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3087 con_back = &registered_con_driver[i];
3088
3089 if (con_back->con &&
3090 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3091 defcsw = con_back->con;
3092 retval = 0;
3093 break;
3094 }
3095 }
3096
3097 if (retval) {
3098 release_console_sem();
3099 goto err;
3100 }
3101
3102 if (!con_is_bound(csw)) {
3103 release_console_sem();
3104 goto err;
3105 }
3106
3107 first = max(first, con_driver->first);
3108 last = min(last, con_driver->last);
3109
3110 for (i = first; i <= last; i++) {
3111 if (con_driver_map[i] == csw) {
3112 module_put(csw->owner);
3113 con_driver_map[i] = NULL;
3114 }
3115 }
3116
3117 if (!con_is_bound(defcsw)) {
3118 const struct consw *defconsw = conswitchp;
3119
3120 defcsw->con_startup();
3121 con_back->flag |= CON_DRIVER_FLAG_INIT;
3122 /*
3123 * vgacon may change the default driver to point
3124 * to dummycon, we restore it here...
3125 */
3126 conswitchp = defconsw;
3127 }
3128
3129 if (!con_is_bound(csw))
3130 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3131
3132 release_console_sem();
3133 /* ignore return value, binding should not fail */
3134 bind_con_driver(defcsw, first, last, deflt);
3135 err:
3136 module_put(owner);
3137 return retval;
3138
3139 }
3140 EXPORT_SYMBOL(unbind_con_driver);
3141
3142 static int vt_bind(struct con_driver *con)
3143 {
3144 const struct consw *defcsw = NULL, *csw = NULL;
3145 int i, more = 1, first = -1, last = -1, deflt = 0;
3146
3147 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3148 con_is_graphics(con->con, con->first, con->last))
3149 goto err;
3150
3151 csw = con->con;
3152
3153 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3154 struct con_driver *con = &registered_con_driver[i];
3155
3156 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3157 defcsw = con->con;
3158 break;
3159 }
3160 }
3161
3162 if (!defcsw)
3163 goto err;
3164
3165 while (more) {
3166 more = 0;
3167
3168 for (i = con->first; i <= con->last; i++) {
3169 if (con_driver_map[i] == defcsw) {
3170 if (first == -1)
3171 first = i;
3172 last = i;
3173 more = 1;
3174 } else if (first != -1)
3175 break;
3176 }
3177
3178 if (first == 0 && last == MAX_NR_CONSOLES -1)
3179 deflt = 1;
3180
3181 if (first != -1)
3182 bind_con_driver(csw, first, last, deflt);
3183
3184 first = -1;
3185 last = -1;
3186 deflt = 0;
3187 }
3188
3189 err:
3190 return 0;
3191 }
3192
3193 static int vt_unbind(struct con_driver *con)
3194 {
3195 const struct consw *csw = NULL;
3196 int i, more = 1, first = -1, last = -1, deflt = 0;
3197
3198 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3199 con_is_graphics(con->con, con->first, con->last))
3200 goto err;
3201
3202 csw = con->con;
3203
3204 while (more) {
3205 more = 0;
3206
3207 for (i = con->first; i <= con->last; i++) {
3208 if (con_driver_map[i] == csw) {
3209 if (first == -1)
3210 first = i;
3211 last = i;
3212 more = 1;
3213 } else if (first != -1)
3214 break;
3215 }
3216
3217 if (first == 0 && last == MAX_NR_CONSOLES -1)
3218 deflt = 1;
3219
3220 if (first != -1)
3221 unbind_con_driver(csw, first, last, deflt);
3222
3223 first = -1;
3224 last = -1;
3225 deflt = 0;
3226 }
3227
3228 err:
3229 return 0;
3230 }
3231 #else
3232 static inline int vt_bind(struct con_driver *con)
3233 {
3234 return 0;
3235 }
3236 static inline int vt_unbind(struct con_driver *con)
3237 {
3238 return 0;
3239 }
3240 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3241
3242 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3243 const char *buf, size_t count)
3244 {
3245 struct con_driver *con = dev_get_drvdata(dev);
3246 int bind = simple_strtoul(buf, NULL, 0);
3247
3248 if (bind)
3249 vt_bind(con);
3250 else
3251 vt_unbind(con);
3252
3253 return count;
3254 }
3255
3256 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3257 char *buf)
3258 {
3259 struct con_driver *con = dev_get_drvdata(dev);
3260 int bind = con_is_bound(con->con);
3261
3262 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3263 }
3264
3265 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3266 char *buf)
3267 {
3268 struct con_driver *con = dev_get_drvdata(dev);
3269
3270 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3271 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3272 con->desc);
3273
3274 }
3275
3276 static struct device_attribute device_attrs[] = {
3277 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3278 __ATTR(name, S_IRUGO, show_name, NULL),
3279 };
3280
3281 static int vtconsole_init_device(struct con_driver *con)
3282 {
3283 int i;
3284 int error = 0;
3285
3286 con->flag |= CON_DRIVER_FLAG_ATTR;
3287 dev_set_drvdata(con->dev, con);
3288 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3289 error = device_create_file(con->dev, &device_attrs[i]);
3290 if (error)
3291 break;
3292 }
3293
3294 if (error) {
3295 while (--i >= 0)
3296 device_remove_file(con->dev, &device_attrs[i]);
3297 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3298 }
3299
3300 return error;
3301 }
3302
3303 static void vtconsole_deinit_device(struct con_driver *con)
3304 {
3305 int i;
3306
3307 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3308 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3309 device_remove_file(con->dev, &device_attrs[i]);
3310 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3311 }
3312 }
3313
3314 /**
3315 * con_is_bound - checks if driver is bound to the console
3316 * @csw: console driver
3317 *
3318 * RETURNS: zero if unbound, nonzero if bound
3319 *
3320 * Drivers can call this and if zero, they should release
3321 * all resources allocated on con_startup()
3322 */
3323 int con_is_bound(const struct consw *csw)
3324 {
3325 int i, bound = 0;
3326
3327 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3328 if (con_driver_map[i] == csw) {
3329 bound = 1;
3330 break;
3331 }
3332 }
3333
3334 return bound;
3335 }
3336 EXPORT_SYMBOL(con_is_bound);
3337
3338 /**
3339 * register_con_driver - register console driver to console layer
3340 * @csw: console driver
3341 * @first: the first console to take over, minimum value is 0
3342 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3343 *
3344 * DESCRIPTION: This function registers a console driver which can later
3345 * bind to a range of consoles specified by @first and @last. It will
3346 * also initialize the console driver by calling con_startup().
3347 */
3348 int register_con_driver(const struct consw *csw, int first, int last)
3349 {
3350 struct module *owner = csw->owner;
3351 struct con_driver *con_driver;
3352 const char *desc;
3353 int i, retval = 0;
3354
3355 if (!try_module_get(owner))
3356 return -ENODEV;
3357
3358 acquire_console_sem();
3359
3360 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3361 con_driver = &registered_con_driver[i];
3362
3363 /* already registered */
3364 if (con_driver->con == csw)
3365 retval = -EINVAL;
3366 }
3367
3368 if (retval)
3369 goto err;
3370
3371 desc = csw->con_startup();
3372
3373 if (!desc)
3374 goto err;
3375
3376 retval = -EINVAL;
3377
3378 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3379 con_driver = &registered_con_driver[i];
3380
3381 if (con_driver->con == NULL) {
3382 con_driver->con = csw;
3383 con_driver->desc = desc;
3384 con_driver->node = i;
3385 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3386 CON_DRIVER_FLAG_INIT;
3387 con_driver->first = first;
3388 con_driver->last = last;
3389 retval = 0;
3390 break;
3391 }
3392 }
3393
3394 if (retval)
3395 goto err;
3396
3397 con_driver->dev = device_create(vtconsole_class, NULL,
3398 MKDEV(0, con_driver->node),
3399 "vtcon%i", con_driver->node);
3400
3401 if (IS_ERR(con_driver->dev)) {
3402 printk(KERN_WARNING "Unable to create device for %s; "
3403 "errno = %ld\n", con_driver->desc,
3404 PTR_ERR(con_driver->dev));
3405 con_driver->dev = NULL;
3406 } else {
3407 vtconsole_init_device(con_driver);
3408 }
3409
3410 err:
3411 release_console_sem();
3412 module_put(owner);
3413 return retval;
3414 }
3415 EXPORT_SYMBOL(register_con_driver);
3416
3417 /**
3418 * unregister_con_driver - unregister console driver from console layer
3419 * @csw: console driver
3420 *
3421 * DESCRIPTION: All drivers that registers to the console layer must
3422 * call this function upon exit, or if the console driver is in a state
3423 * where it won't be able to handle console services, such as the
3424 * framebuffer console without loaded framebuffer drivers.
3425 *
3426 * The driver must unbind first prior to unregistration.
3427 */
3428 int unregister_con_driver(const struct consw *csw)
3429 {
3430 int i, retval = -ENODEV;
3431
3432 acquire_console_sem();
3433
3434 /* cannot unregister a bound driver */
3435 if (con_is_bound(csw))
3436 goto err;
3437
3438 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3439 struct con_driver *con_driver = &registered_con_driver[i];
3440
3441 if (con_driver->con == csw &&
3442 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3443 vtconsole_deinit_device(con_driver);
3444 device_destroy(vtconsole_class,
3445 MKDEV(0, con_driver->node));
3446 con_driver->con = NULL;
3447 con_driver->desc = NULL;
3448 con_driver->dev = NULL;
3449 con_driver->node = 0;
3450 con_driver->flag = 0;
3451 con_driver->first = 0;
3452 con_driver->last = 0;
3453 retval = 0;
3454 break;
3455 }
3456 }
3457 err:
3458 release_console_sem();
3459 return retval;
3460 }
3461 EXPORT_SYMBOL(unregister_con_driver);
3462
3463 /*
3464 * If we support more console drivers, this function is used
3465 * when a driver wants to take over some existing consoles
3466 * and become default driver for newly opened ones.
3467 *
3468 * take_over_console is basically a register followed by unbind
3469 */
3470 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3471 {
3472 int err;
3473
3474 err = register_con_driver(csw, first, last);
3475
3476 if (!err)
3477 bind_con_driver(csw, first, last, deflt);
3478
3479 return err;
3480 }
3481
3482 /*
3483 * give_up_console is a wrapper to unregister_con_driver. It will only
3484 * work if driver is fully unbound.
3485 */
3486 void give_up_console(const struct consw *csw)
3487 {
3488 unregister_con_driver(csw);
3489 }
3490
3491 static int __init vtconsole_class_init(void)
3492 {
3493 int i;
3494
3495 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3496 if (IS_ERR(vtconsole_class)) {
3497 printk(KERN_WARNING "Unable to create vt console class; "
3498 "errno = %ld\n", PTR_ERR(vtconsole_class));
3499 vtconsole_class = NULL;
3500 }
3501
3502 /* Add system drivers to sysfs */
3503 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3504 struct con_driver *con = &registered_con_driver[i];
3505
3506 if (con->con && !con->dev) {
3507 con->dev = device_create(vtconsole_class, NULL,
3508 MKDEV(0, con->node),
3509 "vtcon%i", con->node);
3510
3511 if (IS_ERR(con->dev)) {
3512 printk(KERN_WARNING "Unable to create "
3513 "device for %s; errno = %ld\n",
3514 con->desc, PTR_ERR(con->dev));
3515 con->dev = NULL;
3516 } else {
3517 vtconsole_init_device(con);
3518 }
3519 }
3520 }
3521
3522 return 0;
3523 }
3524 postcore_initcall(vtconsole_class_init);
3525
3526 #endif
3527
3528 /*
3529 * Screen blanking
3530 */
3531
3532 static int set_vesa_blanking(char __user *p)
3533 {
3534 unsigned int mode;
3535
3536 if (get_user(mode, p + 1))
3537 return -EFAULT;
3538
3539 vesa_blank_mode = (mode < 4) ? mode : 0;
3540 return 0;
3541 }
3542
3543 void do_blank_screen(int entering_gfx)
3544 {
3545 struct vc_data *vc = vc_cons[fg_console].d;
3546 int i;
3547
3548 WARN_CONSOLE_UNLOCKED();
3549
3550 if (console_blanked) {
3551 if (blank_state == blank_vesa_wait) {
3552 blank_state = blank_off;
3553 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3554 }
3555 return;
3556 }
3557
3558 /* entering graphics mode? */
3559 if (entering_gfx) {
3560 hide_cursor(vc);
3561 save_screen(vc);
3562 vc->vc_sw->con_blank(vc, -1, 1);
3563 console_blanked = fg_console + 1;
3564 blank_state = blank_off;
3565 set_origin(vc);
3566 return;
3567 }
3568
3569 if (blank_state != blank_normal_wait)
3570 return;
3571 blank_state = blank_off;
3572
3573 /* don't blank graphics */
3574 if (vc->vc_mode != KD_TEXT) {
3575 console_blanked = fg_console + 1;
3576 return;
3577 }
3578
3579 hide_cursor(vc);
3580 del_timer_sync(&console_timer);
3581 blank_timer_expired = 0;
3582
3583 save_screen(vc);
3584 /* In case we need to reset origin, blanking hook returns 1 */
3585 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3586 console_blanked = fg_console + 1;
3587 if (i)
3588 set_origin(vc);
3589
3590 if (console_blank_hook && console_blank_hook(1))
3591 return;
3592
3593 if (vesa_off_interval && vesa_blank_mode) {
3594 blank_state = blank_vesa_wait;
3595 mod_timer(&console_timer, jiffies + vesa_off_interval);
3596 }
3597 }
3598 EXPORT_SYMBOL(do_blank_screen);
3599
3600 /*
3601 * Called by timer as well as from vt_console_driver
3602 */
3603 void do_unblank_screen(int leaving_gfx)
3604 {
3605 struct vc_data *vc;
3606
3607 /* This should now always be called from a "sane" (read: can schedule)
3608 * context for the sake of the low level drivers, except in the special
3609 * case of oops_in_progress
3610 */
3611 if (!oops_in_progress)
3612 might_sleep();
3613
3614 WARN_CONSOLE_UNLOCKED();
3615
3616 ignore_poke = 0;
3617 if (!console_blanked)
3618 return;
3619 if (!vc_cons_allocated(fg_console)) {
3620 /* impossible */
3621 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3622 return;
3623 }
3624 vc = vc_cons[fg_console].d;
3625 if (vc->vc_mode != KD_TEXT)
3626 return; /* but leave console_blanked != 0 */
3627
3628 if (blankinterval) {
3629 mod_timer(&console_timer, jiffies + blankinterval);
3630 blank_state = blank_normal_wait;
3631 }
3632
3633 console_blanked = 0;
3634 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3635 /* Low-level driver cannot restore -> do it ourselves */
3636 update_screen(vc);
3637 if (console_blank_hook)
3638 console_blank_hook(0);
3639 set_palette(vc);
3640 set_cursor(vc);
3641 }
3642 EXPORT_SYMBOL(do_unblank_screen);
3643
3644 /*
3645 * This is called by the outside world to cause a forced unblank, mostly for
3646 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3647 * call it with 1 as an argument and so force a mode restore... that may kill
3648 * X or at least garbage the screen but would also make the Oops visible...
3649 */
3650 void unblank_screen(void)
3651 {
3652 do_unblank_screen(0);
3653 }
3654
3655 /*
3656 * We defer the timer blanking to work queue so it can take the console mutex
3657 * (console operations can still happen at irq time, but only from printk which
3658 * has the console mutex. Not perfect yet, but better than no locking
3659 */
3660 static void blank_screen_t(unsigned long dummy)
3661 {
3662 if (unlikely(!keventd_up())) {
3663 mod_timer(&console_timer, jiffies + blankinterval);
3664 return;
3665 }
3666 blank_timer_expired = 1;
3667 schedule_work(&console_work);
3668 }
3669
3670 void poke_blanked_console(void)
3671 {
3672 WARN_CONSOLE_UNLOCKED();
3673
3674 /* Add this so we quickly catch whoever might call us in a non
3675 * safe context. Nowadays, unblank_screen() isn't to be called in
3676 * atomic contexts and is allowed to schedule (with the special case
3677 * of oops_in_progress, but that isn't of any concern for this
3678 * function. --BenH.
3679 */
3680 might_sleep();
3681
3682 /* This isn't perfectly race free, but a race here would be mostly harmless,
3683 * at worse, we'll do a spurrious blank and it's unlikely
3684 */
3685 del_timer(&console_timer);
3686 blank_timer_expired = 0;
3687
3688 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3689 return;
3690 if (console_blanked)
3691 unblank_screen();
3692 else if (blankinterval) {
3693 mod_timer(&console_timer, jiffies + blankinterval);
3694 blank_state = blank_normal_wait;
3695 }
3696 }
3697
3698 /*
3699 * Palettes
3700 */
3701
3702 static void set_palette(struct vc_data *vc)
3703 {
3704 WARN_CONSOLE_UNLOCKED();
3705
3706 if (vc->vc_mode != KD_GRAPHICS)
3707 vc->vc_sw->con_set_palette(vc, color_table);
3708 }
3709
3710 static int set_get_cmap(unsigned char __user *arg, int set)
3711 {
3712 int i, j, k;
3713
3714 WARN_CONSOLE_UNLOCKED();
3715
3716 for (i = 0; i < 16; i++)
3717 if (set) {
3718 get_user(default_red[i], arg++);
3719 get_user(default_grn[i], arg++);
3720 get_user(default_blu[i], arg++);
3721 } else {
3722 put_user(default_red[i], arg++);
3723 put_user(default_grn[i], arg++);
3724 put_user(default_blu[i], arg++);
3725 }
3726 if (set) {
3727 for (i = 0; i < MAX_NR_CONSOLES; i++)
3728 if (vc_cons_allocated(i)) {
3729 for (j = k = 0; j < 16; j++) {
3730 vc_cons[i].d->vc_palette[k++] = default_red[j];
3731 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3732 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3733 }
3734 set_palette(vc_cons[i].d);
3735 }
3736 }
3737 return 0;
3738 }
3739
3740 /*
3741 * Load palette into the DAC registers. arg points to a colour
3742 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3743 */
3744
3745 int con_set_cmap(unsigned char __user *arg)
3746 {
3747 int rc;
3748
3749 acquire_console_sem();
3750 rc = set_get_cmap (arg,1);
3751 release_console_sem();
3752
3753 return rc;
3754 }
3755
3756 int con_get_cmap(unsigned char __user *arg)
3757 {
3758 int rc;
3759
3760 acquire_console_sem();
3761 rc = set_get_cmap (arg,0);
3762 release_console_sem();
3763
3764 return rc;
3765 }
3766
3767 void reset_palette(struct vc_data *vc)
3768 {
3769 int j, k;
3770 for (j=k=0; j<16; j++) {
3771 vc->vc_palette[k++] = default_red[j];
3772 vc->vc_palette[k++] = default_grn[j];
3773 vc->vc_palette[k++] = default_blu[j];
3774 }
3775 set_palette(vc);
3776 }
3777
3778 /*
3779 * Font switching
3780 *
3781 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3782 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3783 * depending on width) reserved for each character which is kinda wasty, but
3784 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3785 * is upto the actual low-level console-driver convert data into its favorite
3786 * format (maybe we should add a `fontoffset' field to the `display'
3787 * structure so we won't have to convert the fontdata all the time.
3788 * /Jes
3789 */
3790
3791 #define max_font_size 65536
3792
3793 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3794 {
3795 struct console_font font;
3796 int rc = -EINVAL;
3797 int c;
3798
3799 if (vc->vc_mode != KD_TEXT)
3800 return -EINVAL;
3801
3802 if (op->data) {
3803 font.data = kmalloc(max_font_size, GFP_KERNEL);
3804 if (!font.data)
3805 return -ENOMEM;
3806 } else
3807 font.data = NULL;
3808
3809 acquire_console_sem();
3810 if (vc->vc_sw->con_font_get)
3811 rc = vc->vc_sw->con_font_get(vc, &font);
3812 else
3813 rc = -ENOSYS;
3814 release_console_sem();
3815
3816 if (rc)
3817 goto out;
3818
3819 c = (font.width+7)/8 * 32 * font.charcount;
3820
3821 if (op->data && font.charcount > op->charcount)
3822 rc = -ENOSPC;
3823 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3824 if (font.width > op->width || font.height > op->height)
3825 rc = -ENOSPC;
3826 } else {
3827 if (font.width != 8)
3828 rc = -EIO;
3829 else if ((op->height && font.height > op->height) ||
3830 font.height > 32)
3831 rc = -ENOSPC;
3832 }
3833 if (rc)
3834 goto out;
3835
3836 op->height = font.height;
3837 op->width = font.width;
3838 op->charcount = font.charcount;
3839
3840 if (op->data && copy_to_user(op->data, font.data, c))
3841 rc = -EFAULT;
3842
3843 out:
3844 kfree(font.data);
3845 return rc;
3846 }
3847
3848 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3849 {
3850 struct console_font font;
3851 int rc = -EINVAL;
3852 int size;
3853
3854 if (vc->vc_mode != KD_TEXT)
3855 return -EINVAL;
3856 if (!op->data)
3857 return -EINVAL;
3858 if (op->charcount > 512)
3859 return -EINVAL;
3860 if (!op->height) { /* Need to guess font height [compat] */
3861 int h, i;
3862 u8 __user *charmap = op->data;
3863 u8 tmp;
3864
3865 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3866 so that we can get rid of this soon */
3867 if (!(op->flags & KD_FONT_FLAG_OLD))
3868 return -EINVAL;
3869 for (h = 32; h > 0; h--)
3870 for (i = 0; i < op->charcount; i++) {
3871 if (get_user(tmp, &charmap[32*i+h-1]))
3872 return -EFAULT;
3873 if (tmp)
3874 goto nonzero;
3875 }
3876 return -EINVAL;
3877 nonzero:
3878 op->height = h;
3879 }
3880 if (op->width <= 0 || op->width > 32 || op->height > 32)
3881 return -EINVAL;
3882 size = (op->width+7)/8 * 32 * op->charcount;
3883 if (size > max_font_size)
3884 return -ENOSPC;
3885 font.charcount = op->charcount;
3886 font.height = op->height;
3887 font.width = op->width;
3888 font.data = kmalloc(size, GFP_KERNEL);
3889 if (!font.data)
3890 return -ENOMEM;
3891 if (copy_from_user(font.data, op->data, size)) {
3892 kfree(font.data);
3893 return -EFAULT;
3894 }
3895 acquire_console_sem();
3896 if (vc->vc_sw->con_font_set)
3897 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3898 else
3899 rc = -ENOSYS;
3900 release_console_sem();
3901 kfree(font.data);
3902 return rc;
3903 }
3904
3905 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3906 {
3907 struct console_font font = {.width = op->width, .height = op->height};
3908 char name[MAX_FONT_NAME];
3909 char *s = name;
3910 int rc;
3911
3912 if (vc->vc_mode != KD_TEXT)
3913 return -EINVAL;
3914
3915 if (!op->data)
3916 s = NULL;
3917 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3918 return -EFAULT;
3919 else
3920 name[MAX_FONT_NAME - 1] = 0;
3921
3922 acquire_console_sem();
3923 if (vc->vc_sw->con_font_default)
3924 rc = vc->vc_sw->con_font_default(vc, &font, s);
3925 else
3926 rc = -ENOSYS;
3927 release_console_sem();
3928 if (!rc) {
3929 op->width = font.width;
3930 op->height = font.height;
3931 }
3932 return rc;
3933 }
3934
3935 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3936 {
3937 int con = op->height;
3938 int rc;
3939
3940 if (vc->vc_mode != KD_TEXT)
3941 return -EINVAL;
3942
3943 acquire_console_sem();
3944 if (!vc->vc_sw->con_font_copy)
3945 rc = -ENOSYS;
3946 else if (con < 0 || !vc_cons_allocated(con))
3947 rc = -ENOTTY;
3948 else if (con == vc->vc_num) /* nothing to do */
3949 rc = 0;
3950 else
3951 rc = vc->vc_sw->con_font_copy(vc, con);
3952 release_console_sem();
3953 return rc;
3954 }
3955
3956 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3957 {
3958 switch (op->op) {
3959 case KD_FONT_OP_SET:
3960 return con_font_set(vc, op);
3961 case KD_FONT_OP_GET:
3962 return con_font_get(vc, op);
3963 case KD_FONT_OP_SET_DEFAULT:
3964 return con_font_default(vc, op);
3965 case KD_FONT_OP_COPY:
3966 return con_font_copy(vc, op);
3967 }
3968 return -ENOSYS;
3969 }
3970
3971 /*
3972 * Interface exported to selection and vcs.
3973 */
3974
3975 /* used by selection */
3976 u16 screen_glyph(struct vc_data *vc, int offset)
3977 {
3978 u16 w = scr_readw(screenpos(vc, offset, 1));
3979 u16 c = w & 0xff;
3980
3981 if (w & vc->vc_hi_font_mask)
3982 c |= 0x100;
3983 return c;
3984 }
3985
3986 /* used by vcs - note the word offset */
3987 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3988 {
3989 return screenpos(vc, 2 * w_offset, viewed);
3990 }
3991
3992 void getconsxy(struct vc_data *vc, unsigned char *p)
3993 {
3994 p[0] = vc->vc_x;
3995 p[1] = vc->vc_y;
3996 }
3997
3998 void putconsxy(struct vc_data *vc, unsigned char *p)
3999 {
4000 hide_cursor(vc);
4001 gotoxy(vc, p[0], p[1]);
4002 set_cursor(vc);
4003 }
4004
4005 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4006 {
4007 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4008 return softcursor_original;
4009 return scr_readw(org);
4010 }
4011
4012 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4013 {
4014 scr_writew(val, org);
4015 if ((unsigned long)org == vc->vc_pos) {
4016 softcursor_original = -1;
4017 add_softcursor(vc);
4018 }
4019 }
4020
4021 /*
4022 * Visible symbols for modules
4023 */
4024
4025 EXPORT_SYMBOL(color_table);
4026 EXPORT_SYMBOL(default_red);
4027 EXPORT_SYMBOL(default_grn);
4028 EXPORT_SYMBOL(default_blu);
4029 EXPORT_SYMBOL(update_region);
4030 EXPORT_SYMBOL(redraw_screen);
4031 EXPORT_SYMBOL(vc_resize);
4032 EXPORT_SYMBOL(vc_lock_resize);
4033 EXPORT_SYMBOL(fg_console);
4034 EXPORT_SYMBOL(console_blank_hook);
4035 EXPORT_SYMBOL(console_blanked);
4036 EXPORT_SYMBOL(vc_cons);
4037 #ifndef VT_SINGLE_DRIVER
4038 EXPORT_SYMBOL(take_over_console);
4039 EXPORT_SYMBOL(give_up_console);
4040 #endif
Linus' kernel tree