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VT notifier extension for accessibility
[firewire-audio.git] / drivers / char / vt.c
blobdf4c3ead9e2b770664580a892b68249d7b04c786
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 notify_update(vc);
706 }
707 }
708
709 /*
710 * Allocation, freeing and resizing of VTs.
711 */
712
713 int vc_cons_allocated(unsigned int i)
714 {
715 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
716 }
717
718 static void visual_init(struct vc_data *vc, int num, int init)
719 {
720 /* ++Geert: vc->vc_sw->con_init determines console size */
721 if (vc->vc_sw)
722 module_put(vc->vc_sw->owner);
723 vc->vc_sw = conswitchp;
724 #ifndef VT_SINGLE_DRIVER
725 if (con_driver_map[num])
726 vc->vc_sw = con_driver_map[num];
727 #endif
728 __module_get(vc->vc_sw->owner);
729 vc->vc_num = num;
730 vc->vc_display_fg = &master_display_fg;
731 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
732 vc->vc_uni_pagedir = 0;
733 vc->vc_hi_font_mask = 0;
734 vc->vc_complement_mask = 0;
735 vc->vc_can_do_color = 0;
736 vc->vc_sw->con_init(vc, init);
737 if (!vc->vc_complement_mask)
738 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
739 vc->vc_s_complement_mask = vc->vc_complement_mask;
740 vc->vc_size_row = vc->vc_cols << 1;
741 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
742 }
743
744 int vc_allocate(unsigned int currcons) /* return 0 on success */
745 {
746 WARN_CONSOLE_UNLOCKED();
747
748 if (currcons >= MAX_NR_CONSOLES)
749 return -ENXIO;
750 if (!vc_cons[currcons].d) {
751 struct vc_data *vc;
752 struct vt_notifier_param param;
753
754 /* prevent users from taking too much memory */
755 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
756 return -EPERM;
757
758 /* due to the granularity of kmalloc, we waste some memory here */
759 /* the alloc is done in two steps, to optimize the common situation
760 of a 25x80 console (structsize=216, screenbuf_size=4000) */
761 /* although the numbers above are not valid since long ago, the
762 point is still up-to-date and the comment still has its value
763 even if only as a historical artifact. --mj, July 1998 */
764 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
765 if (!vc)
766 return -ENOMEM;
767 vc_cons[currcons].d = vc;
768 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
769 visual_init(vc, currcons, 1);
770 if (!*vc->vc_uni_pagedir_loc)
771 con_set_default_unimap(vc);
772 if (!vc->vc_kmalloced)
773 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
774 if (!vc->vc_screenbuf) {
775 kfree(vc);
776 vc_cons[currcons].d = NULL;
777 return -ENOMEM;
778 }
779 vc->vc_kmalloced = 1;
780 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
781 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
782 }
783 return 0;
784 }
785
786 static inline int resize_screen(struct vc_data *vc, int width, int height,
787 int user)
788 {
789 /* Resizes the resolution of the display adapater */
790 int err = 0;
791
792 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
793 err = vc->vc_sw->con_resize(vc, width, height, user);
794
795 return err;
796 }
797
798 /*
799 * Change # of rows and columns (0 means unchanged/the size of fg_console)
800 * [this is to be used together with some user program
801 * like resize that changes the hardware videomode]
802 */
803 #define VC_RESIZE_MAXCOL (32767)
804 #define VC_RESIZE_MAXROW (32767)
805 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
806 {
807 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
808 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
809 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
810 unsigned int end, user;
811 unsigned short *newscreen;
812
813 WARN_CONSOLE_UNLOCKED();
814
815 if (!vc)
816 return -ENXIO;
817
818 user = vc->vc_resize_user;
819 vc->vc_resize_user = 0;
820
821 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
822 return -EINVAL;
823
824 new_cols = (cols ? cols : vc->vc_cols);
825 new_rows = (lines ? lines : vc->vc_rows);
826 new_row_size = new_cols << 1;
827 new_screen_size = new_row_size * new_rows;
828
829 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
830 return 0;
831
832 newscreen = kmalloc(new_screen_size, GFP_USER);
833 if (!newscreen)
834 return -ENOMEM;
835
836 old_rows = vc->vc_rows;
837 old_cols = vc->vc_cols;
838 old_row_size = vc->vc_size_row;
839 old_screen_size = vc->vc_screenbuf_size;
840
841 err = resize_screen(vc, new_cols, new_rows, user);
842 if (err) {
843 kfree(newscreen);
844 return err;
845 }
846
847 vc->vc_rows = new_rows;
848 vc->vc_cols = new_cols;
849 vc->vc_size_row = new_row_size;
850 vc->vc_screenbuf_size = new_screen_size;
851
852 rlth = min(old_row_size, new_row_size);
853 rrem = new_row_size - rlth;
854 old_origin = vc->vc_origin;
855 new_origin = (long) newscreen;
856 new_scr_end = new_origin + new_screen_size;
857
858 if (vc->vc_y > new_rows) {
859 if (old_rows - vc->vc_y < new_rows) {
860 /*
861 * Cursor near the bottom, copy contents from the
862 * bottom of buffer
863 */
864 old_origin += (old_rows - new_rows) * old_row_size;
865 end = vc->vc_scr_end;
866 } else {
867 /*
868 * Cursor is in no man's land, copy 1/2 screenful
869 * from the top and bottom of cursor position
870 */
871 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
872 end = old_origin + (old_row_size * new_rows);
873 }
874 } else
875 /*
876 * Cursor near the top, copy contents from the top of buffer
877 */
878 end = (old_rows > new_rows) ? old_origin +
879 (old_row_size * new_rows) :
880 vc->vc_scr_end;
881
882 update_attr(vc);
883
884 while (old_origin < end) {
885 scr_memcpyw((unsigned short *) new_origin,
886 (unsigned short *) old_origin, rlth);
887 if (rrem)
888 scr_memsetw((void *)(new_origin + rlth),
889 vc->vc_video_erase_char, rrem);
890 old_origin += old_row_size;
891 new_origin += new_row_size;
892 }
893 if (new_scr_end > new_origin)
894 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
895 new_scr_end - new_origin);
896 if (vc->vc_kmalloced)
897 kfree(vc->vc_screenbuf);
898 vc->vc_screenbuf = newscreen;
899 vc->vc_kmalloced = 1;
900 vc->vc_screenbuf_size = new_screen_size;
901 set_origin(vc);
902
903 /* do part of a reset_terminal() */
904 vc->vc_top = 0;
905 vc->vc_bottom = vc->vc_rows;
906 gotoxy(vc, vc->vc_x, vc->vc_y);
907 save_cur(vc);
908
909 if (vc->vc_tty) {
910 struct winsize ws, *cws = &vc->vc_tty->winsize;
911
912 memset(&ws, 0, sizeof(ws));
913 ws.ws_row = vc->vc_rows;
914 ws.ws_col = vc->vc_cols;
915 ws.ws_ypixel = vc->vc_scan_lines;
916 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
917 vc->vc_tty->pgrp)
918 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
919 *cws = ws;
920 }
921
922 if (CON_IS_VISIBLE(vc))
923 update_screen(vc);
924 return err;
925 }
926
927 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
928 {
929 int rc;
930
931 acquire_console_sem();
932 rc = vc_resize(vc, cols, lines);
933 release_console_sem();
934 return rc;
935 }
936
937 void vc_deallocate(unsigned int currcons)
938 {
939 WARN_CONSOLE_UNLOCKED();
940
941 if (vc_cons_allocated(currcons)) {
942 struct vc_data *vc = vc_cons[currcons].d;
943 struct vt_notifier_param param = { .vc = vc };
944 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
945 vc->vc_sw->con_deinit(vc);
946 put_pid(vc->vt_pid);
947 module_put(vc->vc_sw->owner);
948 if (vc->vc_kmalloced)
949 kfree(vc->vc_screenbuf);
950 if (currcons >= MIN_NR_CONSOLES)
951 kfree(vc);
952 vc_cons[currcons].d = NULL;
953 }
954 }
955
956 /*
957 * VT102 emulator
958 */
959
960 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
961 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
962 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
963
964 #define decarm VC_REPEAT
965 #define decckm VC_CKMODE
966 #define kbdapplic VC_APPLIC
967 #define lnm VC_CRLF
968
969 /*
970 * this is what the terminal answers to a ESC-Z or csi0c query.
971 */
972 #define VT100ID "\033[?1;2c"
973 #define VT102ID "\033[?6c"
974
975 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
976 8,12,10,14, 9,13,11,15 };
977
978 /* the default colour table, for VGA+ colour systems */
979 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
980 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
981 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
982 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
983 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
984 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
985
986 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
987 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
988 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
989
990 /*
991 * gotoxy() must verify all boundaries, because the arguments
992 * might also be negative. If the given position is out of
993 * bounds, the cursor is placed at the nearest margin.
994 */
995 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
996 {
997 int min_y, max_y;
998
999 if (new_x < 0)
1000 vc->vc_x = 0;
1001 else {
1002 if (new_x >= vc->vc_cols)
1003 vc->vc_x = vc->vc_cols - 1;
1004 else
1005 vc->vc_x = new_x;
1006 }
1007
1008 if (vc->vc_decom) {
1009 min_y = vc->vc_top;
1010 max_y = vc->vc_bottom;
1011 } else {
1012 min_y = 0;
1013 max_y = vc->vc_rows;
1014 }
1015 if (new_y < min_y)
1016 vc->vc_y = min_y;
1017 else if (new_y >= max_y)
1018 vc->vc_y = max_y - 1;
1019 else
1020 vc->vc_y = new_y;
1021 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1022 vc->vc_need_wrap = 0;
1023 }
1024
1025 /* for absolute user moves, when decom is set */
1026 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1027 {
1028 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1029 }
1030
1031 void scrollback(struct vc_data *vc, int lines)
1032 {
1033 if (!lines)
1034 lines = vc->vc_rows / 2;
1035 scrolldelta(-lines);
1036 }
1037
1038 void scrollfront(struct vc_data *vc, int lines)
1039 {
1040 if (!lines)
1041 lines = vc->vc_rows / 2;
1042 scrolldelta(lines);
1043 }
1044
1045 static void lf(struct vc_data *vc)
1046 {
1047 /* don't scroll if above bottom of scrolling region, or
1048 * if below scrolling region
1049 */
1050 if (vc->vc_y + 1 == vc->vc_bottom)
1051 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1052 else if (vc->vc_y < vc->vc_rows - 1) {
1053 vc->vc_y++;
1054 vc->vc_pos += vc->vc_size_row;
1055 }
1056 vc->vc_need_wrap = 0;
1057 notify_write(vc, '\n');
1058 }
1059
1060 static void ri(struct vc_data *vc)
1061 {
1062 /* don't scroll if below top of scrolling region, or
1063 * if above scrolling region
1064 */
1065 if (vc->vc_y == vc->vc_top)
1066 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1067 else if (vc->vc_y > 0) {
1068 vc->vc_y--;
1069 vc->vc_pos -= vc->vc_size_row;
1070 }
1071 vc->vc_need_wrap = 0;
1072 }
1073
1074 static inline void cr(struct vc_data *vc)
1075 {
1076 vc->vc_pos -= vc->vc_x << 1;
1077 vc->vc_need_wrap = vc->vc_x = 0;
1078 notify_write(vc, '\r');
1079 }
1080
1081 static inline void bs(struct vc_data *vc)
1082 {
1083 if (vc->vc_x) {
1084 vc->vc_pos -= 2;
1085 vc->vc_x--;
1086 vc->vc_need_wrap = 0;
1087 notify_write(vc, '\b');
1088 }
1089 }
1090
1091 static inline void del(struct vc_data *vc)
1092 {
1093 /* ignored */
1094 }
1095
1096 static void csi_J(struct vc_data *vc, int vpar)
1097 {
1098 unsigned int count;
1099 unsigned short * start;
1100
1101 switch (vpar) {
1102 case 0: /* erase from cursor to end of display */
1103 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1104 start = (unsigned short *)vc->vc_pos;
1105 if (DO_UPDATE(vc)) {
1106 /* do in two stages */
1107 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1108 vc->vc_cols - vc->vc_x);
1109 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1110 vc->vc_rows - vc->vc_y - 1,
1111 vc->vc_cols);
1112 }
1113 break;
1114 case 1: /* erase from start to cursor */
1115 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1116 start = (unsigned short *)vc->vc_origin;
1117 if (DO_UPDATE(vc)) {
1118 /* do in two stages */
1119 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1120 vc->vc_cols);
1121 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1122 vc->vc_x + 1);
1123 }
1124 break;
1125 case 2: /* erase whole display */
1126 count = vc->vc_cols * vc->vc_rows;
1127 start = (unsigned short *)vc->vc_origin;
1128 if (DO_UPDATE(vc))
1129 vc->vc_sw->con_clear(vc, 0, 0,
1130 vc->vc_rows,
1131 vc->vc_cols);
1132 break;
1133 default:
1134 return;
1135 }
1136 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1137 vc->vc_need_wrap = 0;
1138 }
1139
1140 static void csi_K(struct vc_data *vc, int vpar)
1141 {
1142 unsigned int count;
1143 unsigned short * start;
1144
1145 switch (vpar) {
1146 case 0: /* erase from cursor to end of line */
1147 count = vc->vc_cols - vc->vc_x;
1148 start = (unsigned short *)vc->vc_pos;
1149 if (DO_UPDATE(vc))
1150 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1151 vc->vc_cols - vc->vc_x);
1152 break;
1153 case 1: /* erase from start of line to cursor */
1154 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1155 count = vc->vc_x + 1;
1156 if (DO_UPDATE(vc))
1157 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1158 vc->vc_x + 1);
1159 break;
1160 case 2: /* erase whole line */
1161 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1162 count = vc->vc_cols;
1163 if (DO_UPDATE(vc))
1164 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1165 vc->vc_cols);
1166 break;
1167 default:
1168 return;
1169 }
1170 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1171 vc->vc_need_wrap = 0;
1172 }
1173
1174 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1175 { /* not vt100? */
1176 int count;
1177
1178 if (!vpar)
1179 vpar++;
1180 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1181
1182 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1183 if (DO_UPDATE(vc))
1184 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1185 vc->vc_need_wrap = 0;
1186 }
1187
1188 static void default_attr(struct vc_data *vc)
1189 {
1190 vc->vc_intensity = 1;
1191 vc->vc_italic = 0;
1192 vc->vc_underline = 0;
1193 vc->vc_reverse = 0;
1194 vc->vc_blink = 0;
1195 vc->vc_color = vc->vc_def_color;
1196 }
1197
1198 /* console_sem is held */
1199 static void csi_m(struct vc_data *vc)
1200 {
1201 int i;
1202
1203 for (i = 0; i <= vc->vc_npar; i++)
1204 switch (vc->vc_par[i]) {
1205 case 0: /* all attributes off */
1206 default_attr(vc);
1207 break;
1208 case 1:
1209 vc->vc_intensity = 2;
1210 break;
1211 case 2:
1212 vc->vc_intensity = 0;
1213 break;
1214 case 3:
1215 vc->vc_italic = 1;
1216 break;
1217 case 4:
1218 vc->vc_underline = 1;
1219 break;
1220 case 5:
1221 vc->vc_blink = 1;
1222 break;
1223 case 7:
1224 vc->vc_reverse = 1;
1225 break;
1226 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1227 * Select primary font, don't display
1228 * control chars if defined, don't set
1229 * bit 8 on output.
1230 */
1231 vc->vc_translate = set_translate(vc->vc_charset == 0
1232 ? vc->vc_G0_charset
1233 : vc->vc_G1_charset, vc);
1234 vc->vc_disp_ctrl = 0;
1235 vc->vc_toggle_meta = 0;
1236 break;
1237 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1238 * Select first alternate font, lets
1239 * chars < 32 be displayed as ROM chars.
1240 */
1241 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1242 vc->vc_disp_ctrl = 1;
1243 vc->vc_toggle_meta = 0;
1244 break;
1245 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1246 * Select second alternate font, toggle
1247 * high bit before displaying as ROM char.
1248 */
1249 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1250 vc->vc_disp_ctrl = 1;
1251 vc->vc_toggle_meta = 1;
1252 break;
1253 case 21:
1254 case 22:
1255 vc->vc_intensity = 1;
1256 break;
1257 case 23:
1258 vc->vc_italic = 0;
1259 break;
1260 case 24:
1261 vc->vc_underline = 0;
1262 break;
1263 case 25:
1264 vc->vc_blink = 0;
1265 break;
1266 case 27:
1267 vc->vc_reverse = 0;
1268 break;
1269 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1270 * Enables underscore, white foreground
1271 * with white underscore (Linux - use
1272 * default foreground).
1273 */
1274 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1275 vc->vc_underline = 1;
1276 break;
1277 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1278 * Disable underline option.
1279 * Reset colour to default? It did this
1280 * before...
1281 */
1282 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1283 vc->vc_underline = 0;
1284 break;
1285 case 49:
1286 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1287 break;
1288 default:
1289 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1290 vc->vc_color = color_table[vc->vc_par[i] - 30]
1291 | (vc->vc_color & 0xf0);
1292 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1293 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1294 | (vc->vc_color & 0x0f);
1295 break;
1296 }
1297 update_attr(vc);
1298 }
1299
1300 static void respond_string(const char *p, struct tty_struct *tty)
1301 {
1302 while (*p) {
1303 tty_insert_flip_char(tty, *p, 0);
1304 p++;
1305 }
1306 con_schedule_flip(tty);
1307 }
1308
1309 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1310 {
1311 char buf[40];
1312
1313 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1314 respond_string(buf, tty);
1315 }
1316
1317 static inline void status_report(struct tty_struct *tty)
1318 {
1319 respond_string("\033[0n", tty); /* Terminal ok */
1320 }
1321
1322 static inline void respond_ID(struct tty_struct * tty)
1323 {
1324 respond_string(VT102ID, tty);
1325 }
1326
1327 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1328 {
1329 char buf[8];
1330
1331 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1332 (char)('!' + mry));
1333 respond_string(buf, tty);
1334 }
1335
1336 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1337 int mouse_reporting(void)
1338 {
1339 return vc_cons[fg_console].d->vc_report_mouse;
1340 }
1341
1342 /* console_sem is held */
1343 static void set_mode(struct vc_data *vc, int on_off)
1344 {
1345 int i;
1346
1347 for (i = 0; i <= vc->vc_npar; i++)
1348 if (vc->vc_ques) {
1349 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1350 case 1: /* Cursor keys send ^[Ox/^[[x */
1351 if (on_off)
1352 set_kbd(vc, decckm);
1353 else
1354 clr_kbd(vc, decckm);
1355 break;
1356 case 3: /* 80/132 mode switch unimplemented */
1357 vc->vc_deccolm = on_off;
1358 #if 0
1359 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1360 /* this alone does not suffice; some user mode
1361 utility has to change the hardware regs */
1362 #endif
1363 break;
1364 case 5: /* Inverted screen on/off */
1365 if (vc->vc_decscnm != on_off) {
1366 vc->vc_decscnm = on_off;
1367 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1368 update_attr(vc);
1369 }
1370 break;
1371 case 6: /* Origin relative/absolute */
1372 vc->vc_decom = on_off;
1373 gotoxay(vc, 0, 0);
1374 break;
1375 case 7: /* Autowrap on/off */
1376 vc->vc_decawm = on_off;
1377 break;
1378 case 8: /* Autorepeat on/off */
1379 if (on_off)
1380 set_kbd(vc, decarm);
1381 else
1382 clr_kbd(vc, decarm);
1383 break;
1384 case 9:
1385 vc->vc_report_mouse = on_off ? 1 : 0;
1386 break;
1387 case 25: /* Cursor on/off */
1388 vc->vc_deccm = on_off;
1389 break;
1390 case 1000:
1391 vc->vc_report_mouse = on_off ? 2 : 0;
1392 break;
1393 }
1394 } else {
1395 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1396 case 3: /* Monitor (display ctrls) */
1397 vc->vc_disp_ctrl = on_off;
1398 break;
1399 case 4: /* Insert Mode on/off */
1400 vc->vc_decim = on_off;
1401 break;
1402 case 20: /* Lf, Enter == CrLf/Lf */
1403 if (on_off)
1404 set_kbd(vc, lnm);
1405 else
1406 clr_kbd(vc, lnm);
1407 break;
1408 }
1409 }
1410 }
1411
1412 /* console_sem is held */
1413 static void setterm_command(struct vc_data *vc)
1414 {
1415 switch(vc->vc_par[0]) {
1416 case 1: /* set color for underline mode */
1417 if (vc->vc_can_do_color &&
1418 vc->vc_par[1] < 16) {
1419 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1420 if (vc->vc_underline)
1421 update_attr(vc);
1422 }
1423 break;
1424 case 2: /* set color for half intensity mode */
1425 if (vc->vc_can_do_color &&
1426 vc->vc_par[1] < 16) {
1427 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1428 if (vc->vc_intensity == 0)
1429 update_attr(vc);
1430 }
1431 break;
1432 case 8: /* store colors as defaults */
1433 vc->vc_def_color = vc->vc_attr;
1434 if (vc->vc_hi_font_mask == 0x100)
1435 vc->vc_def_color >>= 1;
1436 default_attr(vc);
1437 update_attr(vc);
1438 break;
1439 case 9: /* set blanking interval */
1440 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1441 poke_blanked_console();
1442 break;
1443 case 10: /* set bell frequency in Hz */
1444 if (vc->vc_npar >= 1)
1445 vc->vc_bell_pitch = vc->vc_par[1];
1446 else
1447 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1448 break;
1449 case 11: /* set bell duration in msec */
1450 if (vc->vc_npar >= 1)
1451 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1452 vc->vc_par[1] * HZ / 1000 : 0;
1453 else
1454 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1455 break;
1456 case 12: /* bring specified console to the front */
1457 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1458 set_console(vc->vc_par[1] - 1);
1459 break;
1460 case 13: /* unblank the screen */
1461 poke_blanked_console();
1462 break;
1463 case 14: /* set vesa powerdown interval */
1464 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1465 break;
1466 case 15: /* activate the previous console */
1467 set_console(last_console);
1468 break;
1469 }
1470 }
1471
1472 /* console_sem is held */
1473 static void csi_at(struct vc_data *vc, unsigned int nr)
1474 {
1475 if (nr > vc->vc_cols - vc->vc_x)
1476 nr = vc->vc_cols - vc->vc_x;
1477 else if (!nr)
1478 nr = 1;
1479 insert_char(vc, nr);
1480 }
1481
1482 /* console_sem is held */
1483 static void csi_L(struct vc_data *vc, unsigned int nr)
1484 {
1485 if (nr > vc->vc_rows - vc->vc_y)
1486 nr = vc->vc_rows - vc->vc_y;
1487 else if (!nr)
1488 nr = 1;
1489 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1490 vc->vc_need_wrap = 0;
1491 }
1492
1493 /* console_sem is held */
1494 static void csi_P(struct vc_data *vc, unsigned int nr)
1495 {
1496 if (nr > vc->vc_cols - vc->vc_x)
1497 nr = vc->vc_cols - vc->vc_x;
1498 else if (!nr)
1499 nr = 1;
1500 delete_char(vc, nr);
1501 }
1502
1503 /* console_sem is held */
1504 static void csi_M(struct vc_data *vc, unsigned int nr)
1505 {
1506 if (nr > vc->vc_rows - vc->vc_y)
1507 nr = vc->vc_rows - vc->vc_y;
1508 else if (!nr)
1509 nr=1;
1510 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1511 vc->vc_need_wrap = 0;
1512 }
1513
1514 /* console_sem is held (except via vc_init->reset_terminal */
1515 static void save_cur(struct vc_data *vc)
1516 {
1517 vc->vc_saved_x = vc->vc_x;
1518 vc->vc_saved_y = vc->vc_y;
1519 vc->vc_s_intensity = vc->vc_intensity;
1520 vc->vc_s_italic = vc->vc_italic;
1521 vc->vc_s_underline = vc->vc_underline;
1522 vc->vc_s_blink = vc->vc_blink;
1523 vc->vc_s_reverse = vc->vc_reverse;
1524 vc->vc_s_charset = vc->vc_charset;
1525 vc->vc_s_color = vc->vc_color;
1526 vc->vc_saved_G0 = vc->vc_G0_charset;
1527 vc->vc_saved_G1 = vc->vc_G1_charset;
1528 }
1529
1530 /* console_sem is held */
1531 static void restore_cur(struct vc_data *vc)
1532 {
1533 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1534 vc->vc_intensity = vc->vc_s_intensity;
1535 vc->vc_italic = vc->vc_s_italic;
1536 vc->vc_underline = vc->vc_s_underline;
1537 vc->vc_blink = vc->vc_s_blink;
1538 vc->vc_reverse = vc->vc_s_reverse;
1539 vc->vc_charset = vc->vc_s_charset;
1540 vc->vc_color = vc->vc_s_color;
1541 vc->vc_G0_charset = vc->vc_saved_G0;
1542 vc->vc_G1_charset = vc->vc_saved_G1;
1543 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1544 update_attr(vc);
1545 vc->vc_need_wrap = 0;
1546 }
1547
1548 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1549 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1550 ESpalette };
1551
1552 /* console_sem is held (except via vc_init()) */
1553 static void reset_terminal(struct vc_data *vc, int do_clear)
1554 {
1555 vc->vc_top = 0;
1556 vc->vc_bottom = vc->vc_rows;
1557 vc->vc_state = ESnormal;
1558 vc->vc_ques = 0;
1559 vc->vc_translate = set_translate(LAT1_MAP, vc);
1560 vc->vc_G0_charset = LAT1_MAP;
1561 vc->vc_G1_charset = GRAF_MAP;
1562 vc->vc_charset = 0;
1563 vc->vc_need_wrap = 0;
1564 vc->vc_report_mouse = 0;
1565 vc->vc_utf = default_utf8;
1566 vc->vc_utf_count = 0;
1567
1568 vc->vc_disp_ctrl = 0;
1569 vc->vc_toggle_meta = 0;
1570
1571 vc->vc_decscnm = 0;
1572 vc->vc_decom = 0;
1573 vc->vc_decawm = 1;
1574 vc->vc_deccm = 1;
1575 vc->vc_decim = 0;
1576
1577 set_kbd(vc, decarm);
1578 clr_kbd(vc, decckm);
1579 clr_kbd(vc, kbdapplic);
1580 clr_kbd(vc, lnm);
1581 kbd_table[vc->vc_num].lockstate = 0;
1582 kbd_table[vc->vc_num].slockstate = 0;
1583 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1584 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1585 /* do not do set_leds here because this causes an endless tasklet loop
1586 when the keyboard hasn't been initialized yet */
1587
1588 vc->vc_cursor_type = CUR_DEFAULT;
1589 vc->vc_complement_mask = vc->vc_s_complement_mask;
1590
1591 default_attr(vc);
1592 update_attr(vc);
1593
1594 vc->vc_tab_stop[0] = 0x01010100;
1595 vc->vc_tab_stop[1] =
1596 vc->vc_tab_stop[2] =
1597 vc->vc_tab_stop[3] =
1598 vc->vc_tab_stop[4] = 0x01010101;
1599
1600 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1601 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1602
1603 gotoxy(vc, 0, 0);
1604 save_cur(vc);
1605 if (do_clear)
1606 csi_J(vc, 2);
1607 }
1608
1609 /* console_sem is held */
1610 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1611 {
1612 /*
1613 * Control characters can be used in the _middle_
1614 * of an escape sequence.
1615 */
1616 switch (c) {
1617 case 0:
1618 return;
1619 case 7:
1620 if (vc->vc_bell_duration)
1621 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1622 return;
1623 case 8:
1624 bs(vc);
1625 return;
1626 case 9:
1627 vc->vc_pos -= (vc->vc_x << 1);
1628 while (vc->vc_x < vc->vc_cols - 1) {
1629 vc->vc_x++;
1630 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1631 break;
1632 }
1633 vc->vc_pos += (vc->vc_x << 1);
1634 notify_write(vc, '\t');
1635 return;
1636 case 10: case 11: case 12:
1637 lf(vc);
1638 if (!is_kbd(vc, lnm))
1639 return;
1640 case 13:
1641 cr(vc);
1642 return;
1643 case 14:
1644 vc->vc_charset = 1;
1645 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1646 vc->vc_disp_ctrl = 1;
1647 return;
1648 case 15:
1649 vc->vc_charset = 0;
1650 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1651 vc->vc_disp_ctrl = 0;
1652 return;
1653 case 24: case 26:
1654 vc->vc_state = ESnormal;
1655 return;
1656 case 27:
1657 vc->vc_state = ESesc;
1658 return;
1659 case 127:
1660 del(vc);
1661 return;
1662 case 128+27:
1663 vc->vc_state = ESsquare;
1664 return;
1665 }
1666 switch(vc->vc_state) {
1667 case ESesc:
1668 vc->vc_state = ESnormal;
1669 switch (c) {
1670 case '[':
1671 vc->vc_state = ESsquare;
1672 return;
1673 case ']':
1674 vc->vc_state = ESnonstd;
1675 return;
1676 case '%':
1677 vc->vc_state = ESpercent;
1678 return;
1679 case 'E':
1680 cr(vc);
1681 lf(vc);
1682 return;
1683 case 'M':
1684 ri(vc);
1685 return;
1686 case 'D':
1687 lf(vc);
1688 return;
1689 case 'H':
1690 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1691 return;
1692 case 'Z':
1693 respond_ID(tty);
1694 return;
1695 case '7':
1696 save_cur(vc);
1697 return;
1698 case '8':
1699 restore_cur(vc);
1700 return;
1701 case '(':
1702 vc->vc_state = ESsetG0;
1703 return;
1704 case ')':
1705 vc->vc_state = ESsetG1;
1706 return;
1707 case '#':
1708 vc->vc_state = EShash;
1709 return;
1710 case 'c':
1711 reset_terminal(vc, 1);
1712 return;
1713 case '>': /* Numeric keypad */
1714 clr_kbd(vc, kbdapplic);
1715 return;
1716 case '=': /* Appl. keypad */
1717 set_kbd(vc, kbdapplic);
1718 return;
1719 }
1720 return;
1721 case ESnonstd:
1722 if (c=='P') { /* palette escape sequence */
1723 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1724 vc->vc_par[vc->vc_npar] = 0;
1725 vc->vc_npar = 0;
1726 vc->vc_state = ESpalette;
1727 return;
1728 } else if (c=='R') { /* reset palette */
1729 reset_palette(vc);
1730 vc->vc_state = ESnormal;
1731 } else
1732 vc->vc_state = ESnormal;
1733 return;
1734 case ESpalette:
1735 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1736 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1737 if (vc->vc_npar == 7) {
1738 int i = vc->vc_par[0] * 3, j = 1;
1739 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1740 vc->vc_palette[i++] += vc->vc_par[j++];
1741 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1742 vc->vc_palette[i++] += vc->vc_par[j++];
1743 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1744 vc->vc_palette[i] += vc->vc_par[j];
1745 set_palette(vc);
1746 vc->vc_state = ESnormal;
1747 }
1748 } else
1749 vc->vc_state = ESnormal;
1750 return;
1751 case ESsquare:
1752 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1753 vc->vc_par[vc->vc_npar] = 0;
1754 vc->vc_npar = 0;
1755 vc->vc_state = ESgetpars;
1756 if (c == '[') { /* Function key */
1757 vc->vc_state=ESfunckey;
1758 return;
1759 }
1760 vc->vc_ques = (c == '?');
1761 if (vc->vc_ques)
1762 return;
1763 case ESgetpars:
1764 if (c == ';' && vc->vc_npar < NPAR - 1) {
1765 vc->vc_npar++;
1766 return;
1767 } else if (c>='0' && c<='9') {
1768 vc->vc_par[vc->vc_npar] *= 10;
1769 vc->vc_par[vc->vc_npar] += c - '0';
1770 return;
1771 } else
1772 vc->vc_state = ESgotpars;
1773 case ESgotpars:
1774 vc->vc_state = ESnormal;
1775 switch(c) {
1776 case 'h':
1777 set_mode(vc, 1);
1778 return;
1779 case 'l':
1780 set_mode(vc, 0);
1781 return;
1782 case 'c':
1783 if (vc->vc_ques) {
1784 if (vc->vc_par[0])
1785 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1786 else
1787 vc->vc_cursor_type = CUR_DEFAULT;
1788 return;
1789 }
1790 break;
1791 case 'm':
1792 if (vc->vc_ques) {
1793 clear_selection();
1794 if (vc->vc_par[0])
1795 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1796 else
1797 vc->vc_complement_mask = vc->vc_s_complement_mask;
1798 return;
1799 }
1800 break;
1801 case 'n':
1802 if (!vc->vc_ques) {
1803 if (vc->vc_par[0] == 5)
1804 status_report(tty);
1805 else if (vc->vc_par[0] == 6)
1806 cursor_report(vc, tty);
1807 }
1808 return;
1809 }
1810 if (vc->vc_ques) {
1811 vc->vc_ques = 0;
1812 return;
1813 }
1814 switch(c) {
1815 case 'G': case '`':
1816 if (vc->vc_par[0])
1817 vc->vc_par[0]--;
1818 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1819 return;
1820 case 'A':
1821 if (!vc->vc_par[0])
1822 vc->vc_par[0]++;
1823 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1824 return;
1825 case 'B': case 'e':
1826 if (!vc->vc_par[0])
1827 vc->vc_par[0]++;
1828 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1829 return;
1830 case 'C': case 'a':
1831 if (!vc->vc_par[0])
1832 vc->vc_par[0]++;
1833 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1834 return;
1835 case 'D':
1836 if (!vc->vc_par[0])
1837 vc->vc_par[0]++;
1838 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1839 return;
1840 case 'E':
1841 if (!vc->vc_par[0])
1842 vc->vc_par[0]++;
1843 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1844 return;
1845 case 'F':
1846 if (!vc->vc_par[0])
1847 vc->vc_par[0]++;
1848 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1849 return;
1850 case 'd':
1851 if (vc->vc_par[0])
1852 vc->vc_par[0]--;
1853 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1854 return;
1855 case 'H': case 'f':
1856 if (vc->vc_par[0])
1857 vc->vc_par[0]--;
1858 if (vc->vc_par[1])
1859 vc->vc_par[1]--;
1860 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1861 return;
1862 case 'J':
1863 csi_J(vc, vc->vc_par[0]);
1864 return;
1865 case 'K':
1866 csi_K(vc, vc->vc_par[0]);
1867 return;
1868 case 'L':
1869 csi_L(vc, vc->vc_par[0]);
1870 return;
1871 case 'M':
1872 csi_M(vc, vc->vc_par[0]);
1873 return;
1874 case 'P':
1875 csi_P(vc, vc->vc_par[0]);
1876 return;
1877 case 'c':
1878 if (!vc->vc_par[0])
1879 respond_ID(tty);
1880 return;
1881 case 'g':
1882 if (!vc->vc_par[0])
1883 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1884 else if (vc->vc_par[0] == 3) {
1885 vc->vc_tab_stop[0] =
1886 vc->vc_tab_stop[1] =
1887 vc->vc_tab_stop[2] =
1888 vc->vc_tab_stop[3] =
1889 vc->vc_tab_stop[4] = 0;
1890 }
1891 return;
1892 case 'm':
1893 csi_m(vc);
1894 return;
1895 case 'q': /* DECLL - but only 3 leds */
1896 /* map 0,1,2,3 to 0,1,2,4 */
1897 if (vc->vc_par[0] < 4)
1898 setledstate(kbd_table + vc->vc_num,
1899 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1900 return;
1901 case 'r':
1902 if (!vc->vc_par[0])
1903 vc->vc_par[0]++;
1904 if (!vc->vc_par[1])
1905 vc->vc_par[1] = vc->vc_rows;
1906 /* Minimum allowed region is 2 lines */
1907 if (vc->vc_par[0] < vc->vc_par[1] &&
1908 vc->vc_par[1] <= vc->vc_rows) {
1909 vc->vc_top = vc->vc_par[0] - 1;
1910 vc->vc_bottom = vc->vc_par[1];
1911 gotoxay(vc, 0, 0);
1912 }
1913 return;
1914 case 's':
1915 save_cur(vc);
1916 return;
1917 case 'u':
1918 restore_cur(vc);
1919 return;
1920 case 'X':
1921 csi_X(vc, vc->vc_par[0]);
1922 return;
1923 case '@':
1924 csi_at(vc, vc->vc_par[0]);
1925 return;
1926 case ']': /* setterm functions */
1927 setterm_command(vc);
1928 return;
1929 }
1930 return;
1931 case ESpercent:
1932 vc->vc_state = ESnormal;
1933 switch (c) {
1934 case '@': /* defined in ISO 2022 */
1935 vc->vc_utf = 0;
1936 return;
1937 case 'G': /* prelim official escape code */
1938 case '8': /* retained for compatibility */
1939 vc->vc_utf = 1;
1940 return;
1941 }
1942 return;
1943 case ESfunckey:
1944 vc->vc_state = ESnormal;
1945 return;
1946 case EShash:
1947 vc->vc_state = ESnormal;
1948 if (c == '8') {
1949 /* DEC screen alignment test. kludge :-) */
1950 vc->vc_video_erase_char =
1951 (vc->vc_video_erase_char & 0xff00) | 'E';
1952 csi_J(vc, 2);
1953 vc->vc_video_erase_char =
1954 (vc->vc_video_erase_char & 0xff00) | ' ';
1955 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1956 }
1957 return;
1958 case ESsetG0:
1959 if (c == '0')
1960 vc->vc_G0_charset = GRAF_MAP;
1961 else if (c == 'B')
1962 vc->vc_G0_charset = LAT1_MAP;
1963 else if (c == 'U')
1964 vc->vc_G0_charset = IBMPC_MAP;
1965 else if (c == 'K')
1966 vc->vc_G0_charset = USER_MAP;
1967 if (vc->vc_charset == 0)
1968 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1969 vc->vc_state = ESnormal;
1970 return;
1971 case ESsetG1:
1972 if (c == '0')
1973 vc->vc_G1_charset = GRAF_MAP;
1974 else if (c == 'B')
1975 vc->vc_G1_charset = LAT1_MAP;
1976 else if (c == 'U')
1977 vc->vc_G1_charset = IBMPC_MAP;
1978 else if (c == 'K')
1979 vc->vc_G1_charset = USER_MAP;
1980 if (vc->vc_charset == 1)
1981 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1982 vc->vc_state = ESnormal;
1983 return;
1984 default:
1985 vc->vc_state = ESnormal;
1986 }
1987 }
1988
1989 /* This is a temporary buffer used to prepare a tty console write
1990 * so that we can easily avoid touching user space while holding the
1991 * console spinlock. It is allocated in con_init and is shared by
1992 * this code and the vc_screen read/write tty calls.
1993 *
1994 * We have to allocate this statically in the kernel data section
1995 * since console_init (and thus con_init) are called before any
1996 * kernel memory allocation is available.
1997 */
1998 char con_buf[CON_BUF_SIZE];
1999 DEFINE_MUTEX(con_buf_mtx);
2000
2001 /* is_double_width() is based on the wcwidth() implementation by
2002 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2003 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2004 */
2005 struct interval {
2006 uint32_t first;
2007 uint32_t last;
2008 };
2009
2010 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2011 {
2012 int min = 0;
2013 int mid;
2014
2015 if (ucs < table[0].first || ucs > table[max].last)
2016 return 0;
2017 while (max >= min) {
2018 mid = (min + max) / 2;
2019 if (ucs > table[mid].last)
2020 min = mid + 1;
2021 else if (ucs < table[mid].first)
2022 max = mid - 1;
2023 else
2024 return 1;
2025 }
2026 return 0;
2027 }
2028
2029 static int is_double_width(uint32_t ucs)
2030 {
2031 static const struct interval double_width[] = {
2032 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2033 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2034 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2035 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2036 };
2037 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2038 }
2039
2040 /* acquires console_sem */
2041 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2042 {
2043 #ifdef VT_BUF_VRAM_ONLY
2044 #define FLUSH do { } while(0);
2045 #else
2046 #define FLUSH if (draw_x >= 0) { \
2047 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2048 draw_x = -1; \
2049 }
2050 #endif
2051
2052 int c, tc, ok, n = 0, draw_x = -1;
2053 unsigned int currcons;
2054 unsigned long draw_from = 0, draw_to = 0;
2055 struct vc_data *vc;
2056 unsigned char vc_attr;
2057 struct vt_notifier_param param;
2058 uint8_t rescan;
2059 uint8_t inverse;
2060 uint8_t width;
2061 u16 himask, charmask;
2062 const unsigned char *orig_buf = NULL;
2063 int orig_count;
2064
2065 if (in_interrupt())
2066 return count;
2067
2068 might_sleep();
2069
2070 acquire_console_sem();
2071 vc = tty->driver_data;
2072 if (vc == NULL) {
2073 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2074 release_console_sem();
2075 return 0;
2076 }
2077
2078 currcons = vc->vc_num;
2079 if (!vc_cons_allocated(currcons)) {
2080 /* could this happen? */
2081 static int error = 0;
2082 if (!error) {
2083 error = 1;
2084 printk("con_write: tty %d not allocated\n", currcons+1);
2085 }
2086 release_console_sem();
2087 return 0;
2088 }
2089 release_console_sem();
2090
2091 orig_buf = buf;
2092 orig_count = count;
2093
2094 /* At this point 'buf' is guaranteed to be a kernel buffer
2095 * and therefore no access to userspace (and therefore sleeping)
2096 * will be needed. The con_buf_mtx serializes all tty based
2097 * console rendering and vcs write/read operations. We hold
2098 * the console spinlock during the entire write.
2099 */
2100
2101 acquire_console_sem();
2102
2103 vc = tty->driver_data;
2104 if (vc == NULL) {
2105 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2106 release_console_sem();
2107 goto out;
2108 }
2109
2110 himask = vc->vc_hi_font_mask;
2111 charmask = himask ? 0x1ff : 0xff;
2112
2113 /* undraw cursor first */
2114 if (IS_FG(vc))
2115 hide_cursor(vc);
2116
2117 param.vc = vc;
2118
2119 while (!tty->stopped && count) {
2120 int orig = *buf;
2121 c = orig;
2122 buf++;
2123 n++;
2124 count--;
2125 rescan = 0;
2126 inverse = 0;
2127 width = 1;
2128
2129 /* Do no translation at all in control states */
2130 if (vc->vc_state != ESnormal) {
2131 tc = c;
2132 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2133 /* Combine UTF-8 into Unicode in vc_utf_char.
2134 * vc_utf_count is the number of continuation bytes still
2135 * expected to arrive.
2136 * vc_npar is the number of continuation bytes arrived so
2137 * far
2138 */
2139 rescan_last_byte:
2140 if ((c & 0xc0) == 0x80) {
2141 /* Continuation byte received */
2142 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2143 if (vc->vc_utf_count) {
2144 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2145 vc->vc_npar++;
2146 if (--vc->vc_utf_count) {
2147 /* Still need some bytes */
2148 continue;
2149 }
2150 /* Got a whole character */
2151 c = vc->vc_utf_char;
2152 /* Reject overlong sequences */
2153 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2154 c > utf8_length_changes[vc->vc_npar])
2155 c = 0xfffd;
2156 } else {
2157 /* Unexpected continuation byte */
2158 vc->vc_utf_count = 0;
2159 c = 0xfffd;
2160 }
2161 } else {
2162 /* Single ASCII byte or first byte of a sequence received */
2163 if (vc->vc_utf_count) {
2164 /* Continuation byte expected */
2165 rescan = 1;
2166 vc->vc_utf_count = 0;
2167 c = 0xfffd;
2168 } else if (c > 0x7f) {
2169 /* First byte of a multibyte sequence received */
2170 vc->vc_npar = 0;
2171 if ((c & 0xe0) == 0xc0) {
2172 vc->vc_utf_count = 1;
2173 vc->vc_utf_char = (c & 0x1f);
2174 } else if ((c & 0xf0) == 0xe0) {
2175 vc->vc_utf_count = 2;
2176 vc->vc_utf_char = (c & 0x0f);
2177 } else if ((c & 0xf8) == 0xf0) {
2178 vc->vc_utf_count = 3;
2179 vc->vc_utf_char = (c & 0x07);
2180 } else if ((c & 0xfc) == 0xf8) {
2181 vc->vc_utf_count = 4;
2182 vc->vc_utf_char = (c & 0x03);
2183 } else if ((c & 0xfe) == 0xfc) {
2184 vc->vc_utf_count = 5;
2185 vc->vc_utf_char = (c & 0x01);
2186 } else {
2187 /* 254 and 255 are invalid */
2188 c = 0xfffd;
2189 }
2190 if (vc->vc_utf_count) {
2191 /* Still need some bytes */
2192 continue;
2193 }
2194 }
2195 /* Nothing to do if an ASCII byte was received */
2196 }
2197 /* End of UTF-8 decoding. */
2198 /* c is the received character, or U+FFFD for invalid sequences. */
2199 /* Replace invalid Unicode code points with U+FFFD too */
2200 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2201 c = 0xfffd;
2202 tc = c;
2203 } else { /* no utf or alternate charset mode */
2204 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2205 }
2206
2207 param.c = tc;
2208 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2209 &param) == NOTIFY_STOP)
2210 continue;
2211
2212 /* If the original code was a control character we
2213 * only allow a glyph to be displayed if the code is
2214 * not normally used (such as for cursor movement) or
2215 * if the disp_ctrl mode has been explicitly enabled.
2216 * Certain characters (as given by the CTRL_ALWAYS
2217 * bitmap) are always displayed as control characters,
2218 * as the console would be pretty useless without
2219 * them; to display an arbitrary font position use the
2220 * direct-to-font zone in UTF-8 mode.
2221 */
2222 ok = tc && (c >= 32 ||
2223 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2224 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2225 && (c != 127 || vc->vc_disp_ctrl)
2226 && (c != 128+27);
2227
2228 if (vc->vc_state == ESnormal && ok) {
2229 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2230 if (is_double_width(c))
2231 width = 2;
2232 }
2233 /* Now try to find out how to display it */
2234 tc = conv_uni_to_pc(vc, tc);
2235 if (tc & ~charmask) {
2236 if (tc == -1 || tc == -2) {
2237 continue; /* nothing to display */
2238 }
2239 /* Glyph not found */
2240 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2241 /* In legacy mode use the glyph we get by a 1:1 mapping.
2242 This would make absolutely no sense with Unicode in mind,
2243 but do this for ASCII characters since a font may lack
2244 Unicode mapping info and we don't want to end up with
2245 having question marks only. */
2246 tc = c;
2247 } else {
2248 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2249 tc = conv_uni_to_pc(vc, 0xfffd);
2250 if (tc < 0) {
2251 inverse = 1;
2252 tc = conv_uni_to_pc(vc, '?');
2253 if (tc < 0) tc = '?';
2254 }
2255 }
2256 }
2257
2258 if (!inverse) {
2259 vc_attr = vc->vc_attr;
2260 } else {
2261 /* invert vc_attr */
2262 if (!vc->vc_can_do_color) {
2263 vc_attr = (vc->vc_attr) ^ 0x08;
2264 } else if (vc->vc_hi_font_mask == 0x100) {
2265 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2266 } else {
2267 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2268 }
2269 FLUSH
2270 }
2271
2272 while (1) {
2273 if (vc->vc_need_wrap || vc->vc_decim)
2274 FLUSH
2275 if (vc->vc_need_wrap) {
2276 cr(vc);
2277 lf(vc);
2278 }
2279 if (vc->vc_decim)
2280 insert_char(vc, 1);
2281 scr_writew(himask ?
2282 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2283 (vc_attr << 8) + tc,
2284 (u16 *) vc->vc_pos);
2285 if (DO_UPDATE(vc) && draw_x < 0) {
2286 draw_x = vc->vc_x;
2287 draw_from = vc->vc_pos;
2288 }
2289 if (vc->vc_x == vc->vc_cols - 1) {
2290 vc->vc_need_wrap = vc->vc_decawm;
2291 draw_to = vc->vc_pos + 2;
2292 } else {
2293 vc->vc_x++;
2294 draw_to = (vc->vc_pos += 2);
2295 }
2296
2297 if (!--width) break;
2298
2299 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2300 if (tc < 0) tc = ' ';
2301 }
2302 notify_write(vc, c);
2303
2304 if (inverse) {
2305 FLUSH
2306 }
2307
2308 if (rescan) {
2309 rescan = 0;
2310 inverse = 0;
2311 width = 1;
2312 c = orig;
2313 goto rescan_last_byte;
2314 }
2315 continue;
2316 }
2317 FLUSH
2318 do_con_trol(tty, vc, orig);
2319 }
2320 FLUSH
2321 console_conditional_schedule();
2322 release_console_sem();
2323
2324 out:
2325 notify_update(vc);
2326 return n;
2327 #undef FLUSH
2328 }
2329
2330 /*
2331 * This is the console switching callback.
2332 *
2333 * Doing console switching in a process context allows
2334 * us to do the switches asynchronously (needed when we want
2335 * to switch due to a keyboard interrupt). Synchronization
2336 * with other console code and prevention of re-entrancy is
2337 * ensured with console_sem.
2338 */
2339 static void console_callback(struct work_struct *ignored)
2340 {
2341 acquire_console_sem();
2342
2343 if (want_console >= 0) {
2344 if (want_console != fg_console &&
2345 vc_cons_allocated(want_console)) {
2346 hide_cursor(vc_cons[fg_console].d);
2347 change_console(vc_cons[want_console].d);
2348 /* we only changed when the console had already
2349 been allocated - a new console is not created
2350 in an interrupt routine */
2351 }
2352 want_console = -1;
2353 }
2354 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2355 do_poke_blanked_console = 0;
2356 poke_blanked_console();
2357 }
2358 if (scrollback_delta) {
2359 struct vc_data *vc = vc_cons[fg_console].d;
2360 clear_selection();
2361 if (vc->vc_mode == KD_TEXT)
2362 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2363 scrollback_delta = 0;
2364 }
2365 if (blank_timer_expired) {
2366 do_blank_screen(0);
2367 blank_timer_expired = 0;
2368 }
2369 notify_update(vc_cons[fg_console].d);
2370
2371 release_console_sem();
2372 }
2373
2374 int set_console(int nr)
2375 {
2376 struct vc_data *vc = vc_cons[fg_console].d;
2377
2378 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2379 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2380
2381 /*
2382 * Console switch will fail in console_callback() or
2383 * change_console() so there is no point scheduling
2384 * the callback
2385 *
2386 * Existing set_console() users don't check the return
2387 * value so this shouldn't break anything
2388 */
2389 return -EINVAL;
2390 }
2391
2392 want_console = nr;
2393 schedule_console_callback();
2394
2395 return 0;
2396 }
2397
2398 struct tty_driver *console_driver;
2399
2400 #ifdef CONFIG_VT_CONSOLE
2401
2402 /*
2403 * Console on virtual terminal
2404 *
2405 * The console must be locked when we get here.
2406 */
2407
2408 static void vt_console_print(struct console *co, const char *b, unsigned count)
2409 {
2410 struct vc_data *vc = vc_cons[fg_console].d;
2411 unsigned char c;
2412 static DEFINE_SPINLOCK(printing_lock);
2413 const ushort *start;
2414 ushort cnt = 0;
2415 ushort myx;
2416
2417 /* console busy or not yet initialized */
2418 if (!printable)
2419 return;
2420 if (!spin_trylock(&printing_lock))
2421 return;
2422
2423 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2424 vc = vc_cons[kmsg_redirect - 1].d;
2425
2426 /* read `x' only after setting currcons properly (otherwise
2427 the `x' macro will read the x of the foreground console). */
2428 myx = vc->vc_x;
2429
2430 if (!vc_cons_allocated(fg_console)) {
2431 /* impossible */
2432 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2433 goto quit;
2434 }
2435
2436 if (vc->vc_mode != KD_TEXT)
2437 goto quit;
2438
2439 /* undraw cursor first */
2440 if (IS_FG(vc))
2441 hide_cursor(vc);
2442
2443 start = (ushort *)vc->vc_pos;
2444
2445 /* Contrived structure to try to emulate original need_wrap behaviour
2446 * Problems caused when we have need_wrap set on '\n' character */
2447 while (count--) {
2448 c = *b++;
2449 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2450 if (cnt > 0) {
2451 if (CON_IS_VISIBLE(vc))
2452 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2453 vc->vc_x += cnt;
2454 if (vc->vc_need_wrap)
2455 vc->vc_x--;
2456 cnt = 0;
2457 }
2458 if (c == 8) { /* backspace */
2459 bs(vc);
2460 start = (ushort *)vc->vc_pos;
2461 myx = vc->vc_x;
2462 continue;
2463 }
2464 if (c != 13)
2465 lf(vc);
2466 cr(vc);
2467 start = (ushort *)vc->vc_pos;
2468 myx = vc->vc_x;
2469 if (c == 10 || c == 13)
2470 continue;
2471 }
2472 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2473 notify_write(vc, c);
2474 cnt++;
2475 if (myx == vc->vc_cols - 1) {
2476 vc->vc_need_wrap = 1;
2477 continue;
2478 }
2479 vc->vc_pos += 2;
2480 myx++;
2481 }
2482 if (cnt > 0) {
2483 if (CON_IS_VISIBLE(vc))
2484 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2485 vc->vc_x += cnt;
2486 if (vc->vc_x == vc->vc_cols) {
2487 vc->vc_x--;
2488 vc->vc_need_wrap = 1;
2489 }
2490 }
2491 set_cursor(vc);
2492 notify_update(vc);
2493
2494 quit:
2495 spin_unlock(&printing_lock);
2496 }
2497
2498 static struct tty_driver *vt_console_device(struct console *c, int *index)
2499 {
2500 *index = c->index ? c->index-1 : fg_console;
2501 return console_driver;
2502 }
2503
2504 static struct console vt_console_driver = {
2505 .name = "tty",
2506 .write = vt_console_print,
2507 .device = vt_console_device,
2508 .unblank = unblank_screen,
2509 .flags = CON_PRINTBUFFER,
2510 .index = -1,
2511 };
2512 #endif
2513
2514 /*
2515 * Handling of Linux-specific VC ioctls
2516 */
2517
2518 /*
2519 * Generally a bit racy with respect to console_sem().
2520 *
2521 * There are some functions which don't need it.
2522 *
2523 * There are some functions which can sleep for arbitrary periods
2524 * (paste_selection) but we don't need the lock there anyway.
2525 *
2526 * set_selection has locking, and definitely needs it
2527 */
2528
2529 int tioclinux(struct tty_struct *tty, unsigned long arg)
2530 {
2531 char type, data;
2532 char __user *p = (char __user *)arg;
2533 int lines;
2534 int ret;
2535
2536 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2537 return -EINVAL;
2538 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2539 return -EPERM;
2540 if (get_user(type, p))
2541 return -EFAULT;
2542 ret = 0;
2543 switch (type)
2544 {
2545 case TIOCL_SETSEL:
2546 acquire_console_sem();
2547 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2548 release_console_sem();
2549 break;
2550 case TIOCL_PASTESEL:
2551 ret = paste_selection(tty);
2552 break;
2553 case TIOCL_UNBLANKSCREEN:
2554 acquire_console_sem();
2555 unblank_screen();
2556 release_console_sem();
2557 break;
2558 case TIOCL_SELLOADLUT:
2559 ret = sel_loadlut(p);
2560 break;
2561 case TIOCL_GETSHIFTSTATE:
2562
2563 /*
2564 * Make it possible to react to Shift+Mousebutton.
2565 * Note that 'shift_state' is an undocumented
2566 * kernel-internal variable; programs not closely
2567 * related to the kernel should not use this.
2568 */
2569 data = shift_state;
2570 ret = __put_user(data, p);
2571 break;
2572 case TIOCL_GETMOUSEREPORTING:
2573 data = mouse_reporting();
2574 ret = __put_user(data, p);
2575 break;
2576 case TIOCL_SETVESABLANK:
2577 ret = set_vesa_blanking(p);
2578 break;
2579 case TIOCL_GETKMSGREDIRECT:
2580 data = kmsg_redirect;
2581 ret = __put_user(data, p);
2582 break;
2583 case TIOCL_SETKMSGREDIRECT:
2584 if (!capable(CAP_SYS_ADMIN)) {
2585 ret = -EPERM;
2586 } else {
2587 if (get_user(data, p+1))
2588 ret = -EFAULT;
2589 else
2590 kmsg_redirect = data;
2591 }
2592 break;
2593 case TIOCL_GETFGCONSOLE:
2594 ret = fg_console;
2595 break;
2596 case TIOCL_SCROLLCONSOLE:
2597 if (get_user(lines, (s32 __user *)(p+4))) {
2598 ret = -EFAULT;
2599 } else {
2600 scrollfront(vc_cons[fg_console].d, lines);
2601 ret = 0;
2602 }
2603 break;
2604 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2605 acquire_console_sem();
2606 ignore_poke = 1;
2607 do_blank_screen(0);
2608 release_console_sem();
2609 break;
2610 case TIOCL_BLANKEDSCREEN:
2611 ret = console_blanked;
2612 break;
2613 default:
2614 ret = -EINVAL;
2615 break;
2616 }
2617 return ret;
2618 }
2619
2620 /*
2621 * /dev/ttyN handling
2622 */
2623
2624 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2625 {
2626 int retval;
2627
2628 retval = do_con_write(tty, buf, count);
2629 con_flush_chars(tty);
2630
2631 return retval;
2632 }
2633
2634 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2635 {
2636 if (in_interrupt())
2637 return; /* n_r3964 calls put_char() from interrupt context */
2638 do_con_write(tty, &ch, 1);
2639 }
2640
2641 static int con_write_room(struct tty_struct *tty)
2642 {
2643 if (tty->stopped)
2644 return 0;
2645 return 4096; /* No limit, really; we're not buffering */
2646 }
2647
2648 static int con_chars_in_buffer(struct tty_struct *tty)
2649 {
2650 return 0; /* we're not buffering */
2651 }
2652
2653 /*
2654 * con_throttle and con_unthrottle are only used for
2655 * paste_selection(), which has to stuff in a large number of
2656 * characters...
2657 */
2658 static void con_throttle(struct tty_struct *tty)
2659 {
2660 }
2661
2662 static void con_unthrottle(struct tty_struct *tty)
2663 {
2664 struct vc_data *vc = tty->driver_data;
2665
2666 wake_up_interruptible(&vc->paste_wait);
2667 }
2668
2669 /*
2670 * Turn the Scroll-Lock LED on when the tty is stopped
2671 */
2672 static void con_stop(struct tty_struct *tty)
2673 {
2674 int console_num;
2675 if (!tty)
2676 return;
2677 console_num = tty->index;
2678 if (!vc_cons_allocated(console_num))
2679 return;
2680 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2681 set_leds();
2682 }
2683
2684 /*
2685 * Turn the Scroll-Lock LED off when the console is started
2686 */
2687 static void con_start(struct tty_struct *tty)
2688 {
2689 int console_num;
2690 if (!tty)
2691 return;
2692 console_num = tty->index;
2693 if (!vc_cons_allocated(console_num))
2694 return;
2695 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2696 set_leds();
2697 }
2698
2699 static void con_flush_chars(struct tty_struct *tty)
2700 {
2701 struct vc_data *vc;
2702
2703 if (in_interrupt()) /* from flush_to_ldisc */
2704 return;
2705
2706 /* if we race with con_close(), vt may be null */
2707 acquire_console_sem();
2708 vc = tty->driver_data;
2709 if (vc)
2710 set_cursor(vc);
2711 release_console_sem();
2712 }
2713
2714 /*
2715 * Allocate the console screen memory.
2716 */
2717 static int con_open(struct tty_struct *tty, struct file *filp)
2718 {
2719 unsigned int currcons = tty->index;
2720 int ret = 0;
2721
2722 acquire_console_sem();
2723 if (tty->driver_data == NULL) {
2724 ret = vc_allocate(currcons);
2725 if (ret == 0) {
2726 struct vc_data *vc = vc_cons[currcons].d;
2727 tty->driver_data = vc;
2728 vc->vc_tty = tty;
2729
2730 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2731 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2732 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2733 }
2734 release_console_sem();
2735 vcs_make_sysfs(tty);
2736 return ret;
2737 }
2738 }
2739 release_console_sem();
2740 return ret;
2741 }
2742
2743 /*
2744 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2745 * and taking a ref against the tty while we're in the process of forgetting
2746 * about it and cleaning things up.
2747 *
2748 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2749 */
2750 static void con_close(struct tty_struct *tty, struct file *filp)
2751 {
2752 mutex_lock(&tty_mutex);
2753 acquire_console_sem();
2754 if (tty && tty->count == 1) {
2755 struct vc_data *vc = tty->driver_data;
2756
2757 if (vc)
2758 vc->vc_tty = NULL;
2759 tty->driver_data = NULL;
2760 release_console_sem();
2761 vcs_remove_sysfs(tty);
2762 mutex_unlock(&tty_mutex);
2763 /*
2764 * tty_mutex is released, but we still hold BKL, so there is
2765 * still exclusion against init_dev()
2766 */
2767 return;
2768 }
2769 release_console_sem();
2770 mutex_unlock(&tty_mutex);
2771 }
2772
2773 static int default_italic_color = 2; // green (ASCII)
2774 static int default_underline_color = 3; // cyan (ASCII)
2775 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2776 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2777
2778 static void vc_init(struct vc_data *vc, unsigned int rows,
2779 unsigned int cols, int do_clear)
2780 {
2781 int j, k ;
2782
2783 vc->vc_cols = cols;
2784 vc->vc_rows = rows;
2785 vc->vc_size_row = cols << 1;
2786 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2787
2788 set_origin(vc);
2789 vc->vc_pos = vc->vc_origin;
2790 reset_vc(vc);
2791 for (j=k=0; j<16; j++) {
2792 vc->vc_palette[k++] = default_red[j] ;
2793 vc->vc_palette[k++] = default_grn[j] ;
2794 vc->vc_palette[k++] = default_blu[j] ;
2795 }
2796 vc->vc_def_color = 0x07; /* white */
2797 vc->vc_ulcolor = default_underline_color;
2798 vc->vc_itcolor = default_italic_color;
2799 vc->vc_halfcolor = 0x08; /* grey */
2800 init_waitqueue_head(&vc->paste_wait);
2801 reset_terminal(vc, do_clear);
2802 }
2803
2804 /*
2805 * This routine initializes console interrupts, and does nothing
2806 * else. If you want the screen to clear, call tty_write with
2807 * the appropriate escape-sequence.
2808 */
2809
2810 static int __init con_init(void)
2811 {
2812 const char *display_desc = NULL;
2813 struct vc_data *vc;
2814 unsigned int currcons = 0, i;
2815
2816 acquire_console_sem();
2817
2818 if (conswitchp)
2819 display_desc = conswitchp->con_startup();
2820 if (!display_desc) {
2821 fg_console = 0;
2822 release_console_sem();
2823 return 0;
2824 }
2825
2826 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2827 struct con_driver *con_driver = &registered_con_driver[i];
2828
2829 if (con_driver->con == NULL) {
2830 con_driver->con = conswitchp;
2831 con_driver->desc = display_desc;
2832 con_driver->flag = CON_DRIVER_FLAG_INIT;
2833 con_driver->first = 0;
2834 con_driver->last = MAX_NR_CONSOLES - 1;
2835 break;
2836 }
2837 }
2838
2839 for (i = 0; i < MAX_NR_CONSOLES; i++)
2840 con_driver_map[i] = conswitchp;
2841
2842 if (blankinterval) {
2843 blank_state = blank_normal_wait;
2844 mod_timer(&console_timer, jiffies + blankinterval);
2845 }
2846
2847 /*
2848 * kmalloc is not running yet - we use the bootmem allocator.
2849 */
2850 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2851 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2852 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2853 visual_init(vc, currcons, 1);
2854 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2855 vc->vc_kmalloced = 0;
2856 vc_init(vc, vc->vc_rows, vc->vc_cols,
2857 currcons || !vc->vc_sw->con_save_screen);
2858 }
2859 currcons = fg_console = 0;
2860 master_display_fg = vc = vc_cons[currcons].d;
2861 set_origin(vc);
2862 save_screen(vc);
2863 gotoxy(vc, vc->vc_x, vc->vc_y);
2864 csi_J(vc, 0);
2865 update_screen(vc);
2866 printk("Console: %s %s %dx%d",
2867 vc->vc_can_do_color ? "colour" : "mono",
2868 display_desc, vc->vc_cols, vc->vc_rows);
2869 printable = 1;
2870 printk("\n");
2871
2872 release_console_sem();
2873
2874 #ifdef CONFIG_VT_CONSOLE
2875 register_console(&vt_console_driver);
2876 #endif
2877 return 0;
2878 }
2879 console_initcall(con_init);
2880
2881 static const struct tty_operations con_ops = {
2882 .open = con_open,
2883 .close = con_close,
2884 .write = con_write,
2885 .write_room = con_write_room,
2886 .put_char = con_put_char,
2887 .flush_chars = con_flush_chars,
2888 .chars_in_buffer = con_chars_in_buffer,
2889 .ioctl = vt_ioctl,
2890 .stop = con_stop,
2891 .start = con_start,
2892 .throttle = con_throttle,
2893 .unthrottle = con_unthrottle,
2894 };
2895
2896 int __init vty_init(void)
2897 {
2898 vcs_init();
2899
2900 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2901 if (!console_driver)
2902 panic("Couldn't allocate console driver\n");
2903 console_driver->owner = THIS_MODULE;
2904 console_driver->name = "tty";
2905 console_driver->name_base = 1;
2906 console_driver->major = TTY_MAJOR;
2907 console_driver->minor_start = 1;
2908 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2909 console_driver->init_termios = tty_std_termios;
2910 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2911 tty_set_operations(console_driver, &con_ops);
2912 if (tty_register_driver(console_driver))
2913 panic("Couldn't register console driver\n");
2914
2915 kbd_init();
2916 console_map_init();
2917 #ifdef CONFIG_PROM_CONSOLE
2918 prom_con_init();
2919 #endif
2920 #ifdef CONFIG_MDA_CONSOLE
2921 mda_console_init();
2922 #endif
2923 return 0;
2924 }
2925
2926 #ifndef VT_SINGLE_DRIVER
2927 #include <linux/device.h>
2928
2929 static struct class *vtconsole_class;
2930
2931 static int bind_con_driver(const struct consw *csw, int first, int last,
2932 int deflt)
2933 {
2934 struct module *owner = csw->owner;
2935 const char *desc = NULL;
2936 struct con_driver *con_driver;
2937 int i, j = -1, k = -1, retval = -ENODEV;
2938
2939 if (!try_module_get(owner))
2940 return -ENODEV;
2941
2942 acquire_console_sem();
2943
2944 /* check if driver is registered */
2945 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2946 con_driver = &registered_con_driver[i];
2947
2948 if (con_driver->con == csw) {
2949 desc = con_driver->desc;
2950 retval = 0;
2951 break;
2952 }
2953 }
2954
2955 if (retval)
2956 goto err;
2957
2958 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2959 csw->con_startup();
2960 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2961 }
2962
2963 if (deflt) {
2964 if (conswitchp)
2965 module_put(conswitchp->owner);
2966
2967 __module_get(owner);
2968 conswitchp = csw;
2969 }
2970
2971 first = max(first, con_driver->first);
2972 last = min(last, con_driver->last);
2973
2974 for (i = first; i <= last; i++) {
2975 int old_was_color;
2976 struct vc_data *vc = vc_cons[i].d;
2977
2978 if (con_driver_map[i])
2979 module_put(con_driver_map[i]->owner);
2980 __module_get(owner);
2981 con_driver_map[i] = csw;
2982
2983 if (!vc || !vc->vc_sw)
2984 continue;
2985
2986 j = i;
2987
2988 if (CON_IS_VISIBLE(vc)) {
2989 k = i;
2990 save_screen(vc);
2991 }
2992
2993 old_was_color = vc->vc_can_do_color;
2994 vc->vc_sw->con_deinit(vc);
2995 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2996 visual_init(vc, i, 0);
2997 set_origin(vc);
2998 update_attr(vc);
2999
3000 /* If the console changed between mono <-> color, then
3001 * the attributes in the screenbuf will be wrong. The
3002 * following resets all attributes to something sane.
3003 */
3004 if (old_was_color != vc->vc_can_do_color)
3005 clear_buffer_attributes(vc);
3006 }
3007
3008 printk("Console: switching ");
3009 if (!deflt)
3010 printk("consoles %d-%d ", first+1, last+1);
3011 if (j >= 0) {
3012 struct vc_data *vc = vc_cons[j].d;
3013
3014 printk("to %s %s %dx%d\n",
3015 vc->vc_can_do_color ? "colour" : "mono",
3016 desc, vc->vc_cols, vc->vc_rows);
3017
3018 if (k >= 0) {
3019 vc = vc_cons[k].d;
3020 update_screen(vc);
3021 }
3022 } else
3023 printk("to %s\n", desc);
3024
3025 retval = 0;
3026 err:
3027 release_console_sem();
3028 module_put(owner);
3029 return retval;
3030 };
3031
3032 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3033 static int con_is_graphics(const struct consw *csw, int first, int last)
3034 {
3035 int i, retval = 0;
3036
3037 for (i = first; i <= last; i++) {
3038 struct vc_data *vc = vc_cons[i].d;
3039
3040 if (vc && vc->vc_mode == KD_GRAPHICS) {
3041 retval = 1;
3042 break;
3043 }
3044 }
3045
3046 return retval;
3047 }
3048
3049 /**
3050 * unbind_con_driver - unbind a console driver
3051 * @csw: pointer to console driver to unregister
3052 * @first: first in range of consoles that @csw should be unbound from
3053 * @last: last in range of consoles that @csw should be unbound from
3054 * @deflt: should next bound console driver be default after @csw is unbound?
3055 *
3056 * To unbind a driver from all possible consoles, pass 0 as @first and
3057 * %MAX_NR_CONSOLES as @last.
3058 *
3059 * @deflt controls whether the console that ends up replacing @csw should be
3060 * the default console.
3061 *
3062 * RETURNS:
3063 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3064 * or 0 on success.
3065 */
3066 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3067 {
3068 struct module *owner = csw->owner;
3069 const struct consw *defcsw = NULL;
3070 struct con_driver *con_driver = NULL, *con_back = NULL;
3071 int i, retval = -ENODEV;
3072
3073 if (!try_module_get(owner))
3074 return -ENODEV;
3075
3076 acquire_console_sem();
3077
3078 /* check if driver is registered and if it is unbindable */
3079 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3080 con_driver = &registered_con_driver[i];
3081
3082 if (con_driver->con == csw &&
3083 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3084 retval = 0;
3085 break;
3086 }
3087 }
3088
3089 if (retval) {
3090 release_console_sem();
3091 goto err;
3092 }
3093
3094 retval = -ENODEV;
3095
3096 /* check if backup driver exists */
3097 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3098 con_back = &registered_con_driver[i];
3099
3100 if (con_back->con &&
3101 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3102 defcsw = con_back->con;
3103 retval = 0;
3104 break;
3105 }
3106 }
3107
3108 if (retval) {
3109 release_console_sem();
3110 goto err;
3111 }
3112
3113 if (!con_is_bound(csw)) {
3114 release_console_sem();
3115 goto err;
3116 }
3117
3118 first = max(first, con_driver->first);
3119 last = min(last, con_driver->last);
3120
3121 for (i = first; i <= last; i++) {
3122 if (con_driver_map[i] == csw) {
3123 module_put(csw->owner);
3124 con_driver_map[i] = NULL;
3125 }
3126 }
3127
3128 if (!con_is_bound(defcsw)) {
3129 const struct consw *defconsw = conswitchp;
3130
3131 defcsw->con_startup();
3132 con_back->flag |= CON_DRIVER_FLAG_INIT;
3133 /*
3134 * vgacon may change the default driver to point
3135 * to dummycon, we restore it here...
3136 */
3137 conswitchp = defconsw;
3138 }
3139
3140 if (!con_is_bound(csw))
3141 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3142
3143 release_console_sem();
3144 /* ignore return value, binding should not fail */
3145 bind_con_driver(defcsw, first, last, deflt);
3146 err:
3147 module_put(owner);
3148 return retval;
3149
3150 }
3151 EXPORT_SYMBOL(unbind_con_driver);
3152
3153 static int vt_bind(struct con_driver *con)
3154 {
3155 const struct consw *defcsw = NULL, *csw = NULL;
3156 int i, more = 1, first = -1, last = -1, deflt = 0;
3157
3158 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3159 con_is_graphics(con->con, con->first, con->last))
3160 goto err;
3161
3162 csw = con->con;
3163
3164 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3165 struct con_driver *con = &registered_con_driver[i];
3166
3167 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3168 defcsw = con->con;
3169 break;
3170 }
3171 }
3172
3173 if (!defcsw)
3174 goto err;
3175
3176 while (more) {
3177 more = 0;
3178
3179 for (i = con->first; i <= con->last; i++) {
3180 if (con_driver_map[i] == defcsw) {
3181 if (first == -1)
3182 first = i;
3183 last = i;
3184 more = 1;
3185 } else if (first != -1)
3186 break;
3187 }
3188
3189 if (first == 0 && last == MAX_NR_CONSOLES -1)
3190 deflt = 1;
3191
3192 if (first != -1)
3193 bind_con_driver(csw, first, last, deflt);
3194
3195 first = -1;
3196 last = -1;
3197 deflt = 0;
3198 }
3199
3200 err:
3201 return 0;
3202 }
3203
3204 static int vt_unbind(struct con_driver *con)
3205 {
3206 const struct consw *csw = NULL;
3207 int i, more = 1, first = -1, last = -1, deflt = 0;
3208
3209 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3210 con_is_graphics(con->con, con->first, con->last))
3211 goto err;
3212
3213 csw = con->con;
3214
3215 while (more) {
3216 more = 0;
3217
3218 for (i = con->first; i <= con->last; i++) {
3219 if (con_driver_map[i] == csw) {
3220 if (first == -1)
3221 first = i;
3222 last = i;
3223 more = 1;
3224 } else if (first != -1)
3225 break;
3226 }
3227
3228 if (first == 0 && last == MAX_NR_CONSOLES -1)
3229 deflt = 1;
3230
3231 if (first != -1)
3232 unbind_con_driver(csw, first, last, deflt);
3233
3234 first = -1;
3235 last = -1;
3236 deflt = 0;
3237 }
3238
3239 err:
3240 return 0;
3241 }
3242 #else
3243 static inline int vt_bind(struct con_driver *con)
3244 {
3245 return 0;
3246 }
3247 static inline int vt_unbind(struct con_driver *con)
3248 {
3249 return 0;
3250 }
3251 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3252
3253 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3254 const char *buf, size_t count)
3255 {
3256 struct con_driver *con = dev_get_drvdata(dev);
3257 int bind = simple_strtoul(buf, NULL, 0);
3258
3259 if (bind)
3260 vt_bind(con);
3261 else
3262 vt_unbind(con);
3263
3264 return count;
3265 }
3266
3267 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3268 char *buf)
3269 {
3270 struct con_driver *con = dev_get_drvdata(dev);
3271 int bind = con_is_bound(con->con);
3272
3273 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3274 }
3275
3276 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3277 char *buf)
3278 {
3279 struct con_driver *con = dev_get_drvdata(dev);
3280
3281 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3282 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3283 con->desc);
3284
3285 }
3286
3287 static struct device_attribute device_attrs[] = {
3288 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3289 __ATTR(name, S_IRUGO, show_name, NULL),
3290 };
3291
3292 static int vtconsole_init_device(struct con_driver *con)
3293 {
3294 int i;
3295 int error = 0;
3296
3297 con->flag |= CON_DRIVER_FLAG_ATTR;
3298 dev_set_drvdata(con->dev, con);
3299 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3300 error = device_create_file(con->dev, &device_attrs[i]);
3301 if (error)
3302 break;
3303 }
3304
3305 if (error) {
3306 while (--i >= 0)
3307 device_remove_file(con->dev, &device_attrs[i]);
3308 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3309 }
3310
3311 return error;
3312 }
3313
3314 static void vtconsole_deinit_device(struct con_driver *con)
3315 {
3316 int i;
3317
3318 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3319 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3320 device_remove_file(con->dev, &device_attrs[i]);
3321 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3322 }
3323 }
3324
3325 /**
3326 * con_is_bound - checks if driver is bound to the console
3327 * @csw: console driver
3328 *
3329 * RETURNS: zero if unbound, nonzero if bound
3330 *
3331 * Drivers can call this and if zero, they should release
3332 * all resources allocated on con_startup()
3333 */
3334 int con_is_bound(const struct consw *csw)
3335 {
3336 int i, bound = 0;
3337
3338 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3339 if (con_driver_map[i] == csw) {
3340 bound = 1;
3341 break;
3342 }
3343 }
3344
3345 return bound;
3346 }
3347 EXPORT_SYMBOL(con_is_bound);
3348
3349 /**
3350 * register_con_driver - register console driver to console layer
3351 * @csw: console driver
3352 * @first: the first console to take over, minimum value is 0
3353 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3354 *
3355 * DESCRIPTION: This function registers a console driver which can later
3356 * bind to a range of consoles specified by @first and @last. It will
3357 * also initialize the console driver by calling con_startup().
3358 */
3359 int register_con_driver(const struct consw *csw, int first, int last)
3360 {
3361 struct module *owner = csw->owner;
3362 struct con_driver *con_driver;
3363 const char *desc;
3364 int i, retval = 0;
3365
3366 if (!try_module_get(owner))
3367 return -ENODEV;
3368
3369 acquire_console_sem();
3370
3371 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3372 con_driver = &registered_con_driver[i];
3373
3374 /* already registered */
3375 if (con_driver->con == csw)
3376 retval = -EINVAL;
3377 }
3378
3379 if (retval)
3380 goto err;
3381
3382 desc = csw->con_startup();
3383
3384 if (!desc)
3385 goto err;
3386
3387 retval = -EINVAL;
3388
3389 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3390 con_driver = &registered_con_driver[i];
3391
3392 if (con_driver->con == NULL) {
3393 con_driver->con = csw;
3394 con_driver->desc = desc;
3395 con_driver->node = i;
3396 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3397 CON_DRIVER_FLAG_INIT;
3398 con_driver->first = first;
3399 con_driver->last = last;
3400 retval = 0;
3401 break;
3402 }
3403 }
3404
3405 if (retval)
3406 goto err;
3407
3408 con_driver->dev = device_create(vtconsole_class, NULL,
3409 MKDEV(0, con_driver->node),
3410 "vtcon%i", con_driver->node);
3411
3412 if (IS_ERR(con_driver->dev)) {
3413 printk(KERN_WARNING "Unable to create device for %s; "
3414 "errno = %ld\n", con_driver->desc,
3415 PTR_ERR(con_driver->dev));
3416 con_driver->dev = NULL;
3417 } else {
3418 vtconsole_init_device(con_driver);
3419 }
3420
3421 err:
3422 release_console_sem();
3423 module_put(owner);
3424 return retval;
3425 }
3426 EXPORT_SYMBOL(register_con_driver);
3427
3428 /**
3429 * unregister_con_driver - unregister console driver from console layer
3430 * @csw: console driver
3431 *
3432 * DESCRIPTION: All drivers that registers to the console layer must
3433 * call this function upon exit, or if the console driver is in a state
3434 * where it won't be able to handle console services, such as the
3435 * framebuffer console without loaded framebuffer drivers.
3436 *
3437 * The driver must unbind first prior to unregistration.
3438 */
3439 int unregister_con_driver(const struct consw *csw)
3440 {
3441 int i, retval = -ENODEV;
3442
3443 acquire_console_sem();
3444
3445 /* cannot unregister a bound driver */
3446 if (con_is_bound(csw))
3447 goto err;
3448
3449 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450 struct con_driver *con_driver = &registered_con_driver[i];
3451
3452 if (con_driver->con == csw &&
3453 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3454 vtconsole_deinit_device(con_driver);
3455 device_destroy(vtconsole_class,
3456 MKDEV(0, con_driver->node));
3457 con_driver->con = NULL;
3458 con_driver->desc = NULL;
3459 con_driver->dev = NULL;
3460 con_driver->node = 0;
3461 con_driver->flag = 0;
3462 con_driver->first = 0;
3463 con_driver->last = 0;
3464 retval = 0;
3465 break;
3466 }
3467 }
3468 err:
3469 release_console_sem();
3470 return retval;
3471 }
3472 EXPORT_SYMBOL(unregister_con_driver);
3473
3474 /*
3475 * If we support more console drivers, this function is used
3476 * when a driver wants to take over some existing consoles
3477 * and become default driver for newly opened ones.
3478 *
3479 * take_over_console is basically a register followed by unbind
3480 */
3481 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3482 {
3483 int err;
3484
3485 err = register_con_driver(csw, first, last);
3486
3487 if (!err)
3488 bind_con_driver(csw, first, last, deflt);
3489
3490 return err;
3491 }
3492
3493 /*
3494 * give_up_console is a wrapper to unregister_con_driver. It will only
3495 * work if driver is fully unbound.
3496 */
3497 void give_up_console(const struct consw *csw)
3498 {
3499 unregister_con_driver(csw);
3500 }
3501
3502 static int __init vtconsole_class_init(void)
3503 {
3504 int i;
3505
3506 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3507 if (IS_ERR(vtconsole_class)) {
3508 printk(KERN_WARNING "Unable to create vt console class; "
3509 "errno = %ld\n", PTR_ERR(vtconsole_class));
3510 vtconsole_class = NULL;
3511 }
3512
3513 /* Add system drivers to sysfs */
3514 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3515 struct con_driver *con = &registered_con_driver[i];
3516
3517 if (con->con && !con->dev) {
3518 con->dev = device_create(vtconsole_class, NULL,
3519 MKDEV(0, con->node),
3520 "vtcon%i", con->node);
3521
3522 if (IS_ERR(con->dev)) {
3523 printk(KERN_WARNING "Unable to create "
3524 "device for %s; errno = %ld\n",
3525 con->desc, PTR_ERR(con->dev));
3526 con->dev = NULL;
3527 } else {
3528 vtconsole_init_device(con);
3529 }
3530 }
3531 }
3532
3533 return 0;
3534 }
3535 postcore_initcall(vtconsole_class_init);
3536
3537 #endif
3538
3539 /*
3540 * Screen blanking
3541 */
3542
3543 static int set_vesa_blanking(char __user *p)
3544 {
3545 unsigned int mode;
3546
3547 if (get_user(mode, p + 1))
3548 return -EFAULT;
3549
3550 vesa_blank_mode = (mode < 4) ? mode : 0;
3551 return 0;
3552 }
3553
3554 void do_blank_screen(int entering_gfx)
3555 {
3556 struct vc_data *vc = vc_cons[fg_console].d;
3557 int i;
3558
3559 WARN_CONSOLE_UNLOCKED();
3560
3561 if (console_blanked) {
3562 if (blank_state == blank_vesa_wait) {
3563 blank_state = blank_off;
3564 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3565 }
3566 return;
3567 }
3568
3569 /* entering graphics mode? */
3570 if (entering_gfx) {
3571 hide_cursor(vc);
3572 save_screen(vc);
3573 vc->vc_sw->con_blank(vc, -1, 1);
3574 console_blanked = fg_console + 1;
3575 blank_state = blank_off;
3576 set_origin(vc);
3577 return;
3578 }
3579
3580 if (blank_state != blank_normal_wait)
3581 return;
3582 blank_state = blank_off;
3583
3584 /* don't blank graphics */
3585 if (vc->vc_mode != KD_TEXT) {
3586 console_blanked = fg_console + 1;
3587 return;
3588 }
3589
3590 hide_cursor(vc);
3591 del_timer_sync(&console_timer);
3592 blank_timer_expired = 0;
3593
3594 save_screen(vc);
3595 /* In case we need to reset origin, blanking hook returns 1 */
3596 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3597 console_blanked = fg_console + 1;
3598 if (i)
3599 set_origin(vc);
3600
3601 if (console_blank_hook && console_blank_hook(1))
3602 return;
3603
3604 if (vesa_off_interval && vesa_blank_mode) {
3605 blank_state = blank_vesa_wait;
3606 mod_timer(&console_timer, jiffies + vesa_off_interval);
3607 }
3608 }
3609 EXPORT_SYMBOL(do_blank_screen);
3610
3611 /*
3612 * Called by timer as well as from vt_console_driver
3613 */
3614 void do_unblank_screen(int leaving_gfx)
3615 {
3616 struct vc_data *vc;
3617
3618 /* This should now always be called from a "sane" (read: can schedule)
3619 * context for the sake of the low level drivers, except in the special
3620 * case of oops_in_progress
3621 */
3622 if (!oops_in_progress)
3623 might_sleep();
3624
3625 WARN_CONSOLE_UNLOCKED();
3626
3627 ignore_poke = 0;
3628 if (!console_blanked)
3629 return;
3630 if (!vc_cons_allocated(fg_console)) {
3631 /* impossible */
3632 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3633 return;
3634 }
3635 vc = vc_cons[fg_console].d;
3636 if (vc->vc_mode != KD_TEXT)
3637 return; /* but leave console_blanked != 0 */
3638
3639 if (blankinterval) {
3640 mod_timer(&console_timer, jiffies + blankinterval);
3641 blank_state = blank_normal_wait;
3642 }
3643
3644 console_blanked = 0;
3645 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3646 /* Low-level driver cannot restore -> do it ourselves */
3647 update_screen(vc);
3648 if (console_blank_hook)
3649 console_blank_hook(0);
3650 set_palette(vc);
3651 set_cursor(vc);
3652 }
3653 EXPORT_SYMBOL(do_unblank_screen);
3654
3655 /*
3656 * This is called by the outside world to cause a forced unblank, mostly for
3657 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3658 * call it with 1 as an argument and so force a mode restore... that may kill
3659 * X or at least garbage the screen but would also make the Oops visible...
3660 */
3661 void unblank_screen(void)
3662 {
3663 do_unblank_screen(0);
3664 }
3665
3666 /*
3667 * We defer the timer blanking to work queue so it can take the console mutex
3668 * (console operations can still happen at irq time, but only from printk which
3669 * has the console mutex. Not perfect yet, but better than no locking
3670 */
3671 static void blank_screen_t(unsigned long dummy)
3672 {
3673 if (unlikely(!keventd_up())) {
3674 mod_timer(&console_timer, jiffies + blankinterval);
3675 return;
3676 }
3677 blank_timer_expired = 1;
3678 schedule_work(&console_work);
3679 }
3680
3681 void poke_blanked_console(void)
3682 {
3683 WARN_CONSOLE_UNLOCKED();
3684
3685 /* Add this so we quickly catch whoever might call us in a non
3686 * safe context. Nowadays, unblank_screen() isn't to be called in
3687 * atomic contexts and is allowed to schedule (with the special case
3688 * of oops_in_progress, but that isn't of any concern for this
3689 * function. --BenH.
3690 */
3691 might_sleep();
3692
3693 /* This isn't perfectly race free, but a race here would be mostly harmless,
3694 * at worse, we'll do a spurrious blank and it's unlikely
3695 */
3696 del_timer(&console_timer);
3697 blank_timer_expired = 0;
3698
3699 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3700 return;
3701 if (console_blanked)
3702 unblank_screen();
3703 else if (blankinterval) {
3704 mod_timer(&console_timer, jiffies + blankinterval);
3705 blank_state = blank_normal_wait;
3706 }
3707 }
3708
3709 /*
3710 * Palettes
3711 */
3712
3713 static void set_palette(struct vc_data *vc)
3714 {
3715 WARN_CONSOLE_UNLOCKED();
3716
3717 if (vc->vc_mode != KD_GRAPHICS)
3718 vc->vc_sw->con_set_palette(vc, color_table);
3719 }
3720
3721 static int set_get_cmap(unsigned char __user *arg, int set)
3722 {
3723 int i, j, k;
3724
3725 WARN_CONSOLE_UNLOCKED();
3726
3727 for (i = 0; i < 16; i++)
3728 if (set) {
3729 get_user(default_red[i], arg++);
3730 get_user(default_grn[i], arg++);
3731 get_user(default_blu[i], arg++);
3732 } else {
3733 put_user(default_red[i], arg++);
3734 put_user(default_grn[i], arg++);
3735 put_user(default_blu[i], arg++);
3736 }
3737 if (set) {
3738 for (i = 0; i < MAX_NR_CONSOLES; i++)
3739 if (vc_cons_allocated(i)) {
3740 for (j = k = 0; j < 16; j++) {
3741 vc_cons[i].d->vc_palette[k++] = default_red[j];
3742 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3743 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3744 }
3745 set_palette(vc_cons[i].d);
3746 }
3747 }
3748 return 0;
3749 }
3750
3751 /*
3752 * Load palette into the DAC registers. arg points to a colour
3753 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3754 */
3755
3756 int con_set_cmap(unsigned char __user *arg)
3757 {
3758 int rc;
3759
3760 acquire_console_sem();
3761 rc = set_get_cmap (arg,1);
3762 release_console_sem();
3763
3764 return rc;
3765 }
3766
3767 int con_get_cmap(unsigned char __user *arg)
3768 {
3769 int rc;
3770
3771 acquire_console_sem();
3772 rc = set_get_cmap (arg,0);
3773 release_console_sem();
3774
3775 return rc;
3776 }
3777
3778 void reset_palette(struct vc_data *vc)
3779 {
3780 int j, k;
3781 for (j=k=0; j<16; j++) {
3782 vc->vc_palette[k++] = default_red[j];
3783 vc->vc_palette[k++] = default_grn[j];
3784 vc->vc_palette[k++] = default_blu[j];
3785 }
3786 set_palette(vc);
3787 }
3788
3789 /*
3790 * Font switching
3791 *
3792 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3793 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3794 * depending on width) reserved for each character which is kinda wasty, but
3795 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3796 * is upto the actual low-level console-driver convert data into its favorite
3797 * format (maybe we should add a `fontoffset' field to the `display'
3798 * structure so we won't have to convert the fontdata all the time.
3799 * /Jes
3800 */
3801
3802 #define max_font_size 65536
3803
3804 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3805 {
3806 struct console_font font;
3807 int rc = -EINVAL;
3808 int c;
3809
3810 if (vc->vc_mode != KD_TEXT)
3811 return -EINVAL;
3812
3813 if (op->data) {
3814 font.data = kmalloc(max_font_size, GFP_KERNEL);
3815 if (!font.data)
3816 return -ENOMEM;
3817 } else
3818 font.data = NULL;
3819
3820 acquire_console_sem();
3821 if (vc->vc_sw->con_font_get)
3822 rc = vc->vc_sw->con_font_get(vc, &font);
3823 else
3824 rc = -ENOSYS;
3825 release_console_sem();
3826
3827 if (rc)
3828 goto out;
3829
3830 c = (font.width+7)/8 * 32 * font.charcount;
3831
3832 if (op->data && font.charcount > op->charcount)
3833 rc = -ENOSPC;
3834 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3835 if (font.width > op->width || font.height > op->height)
3836 rc = -ENOSPC;
3837 } else {
3838 if (font.width != 8)
3839 rc = -EIO;
3840 else if ((op->height && font.height > op->height) ||
3841 font.height > 32)
3842 rc = -ENOSPC;
3843 }
3844 if (rc)
3845 goto out;
3846
3847 op->height = font.height;
3848 op->width = font.width;
3849 op->charcount = font.charcount;
3850
3851 if (op->data && copy_to_user(op->data, font.data, c))
3852 rc = -EFAULT;
3853
3854 out:
3855 kfree(font.data);
3856 return rc;
3857 }
3858
3859 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3860 {
3861 struct console_font font;
3862 int rc = -EINVAL;
3863 int size;
3864
3865 if (vc->vc_mode != KD_TEXT)
3866 return -EINVAL;
3867 if (!op->data)
3868 return -EINVAL;
3869 if (op->charcount > 512)
3870 return -EINVAL;
3871 if (!op->height) { /* Need to guess font height [compat] */
3872 int h, i;
3873 u8 __user *charmap = op->data;
3874 u8 tmp;
3875
3876 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3877 so that we can get rid of this soon */
3878 if (!(op->flags & KD_FONT_FLAG_OLD))
3879 return -EINVAL;
3880 for (h = 32; h > 0; h--)
3881 for (i = 0; i < op->charcount; i++) {
3882 if (get_user(tmp, &charmap[32*i+h-1]))
3883 return -EFAULT;
3884 if (tmp)
3885 goto nonzero;
3886 }
3887 return -EINVAL;
3888 nonzero:
3889 op->height = h;
3890 }
3891 if (op->width <= 0 || op->width > 32 || op->height > 32)
3892 return -EINVAL;
3893 size = (op->width+7)/8 * 32 * op->charcount;
3894 if (size > max_font_size)
3895 return -ENOSPC;
3896 font.charcount = op->charcount;
3897 font.height = op->height;
3898 font.width = op->width;
3899 font.data = kmalloc(size, GFP_KERNEL);
3900 if (!font.data)
3901 return -ENOMEM;
3902 if (copy_from_user(font.data, op->data, size)) {
3903 kfree(font.data);
3904 return -EFAULT;
3905 }
3906 acquire_console_sem();
3907 if (vc->vc_sw->con_font_set)
3908 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3909 else
3910 rc = -ENOSYS;
3911 release_console_sem();
3912 kfree(font.data);
3913 return rc;
3914 }
3915
3916 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3917 {
3918 struct console_font font = {.width = op->width, .height = op->height};
3919 char name[MAX_FONT_NAME];
3920 char *s = name;
3921 int rc;
3922
3923 if (vc->vc_mode != KD_TEXT)
3924 return -EINVAL;
3925
3926 if (!op->data)
3927 s = NULL;
3928 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3929 return -EFAULT;
3930 else
3931 name[MAX_FONT_NAME - 1] = 0;
3932
3933 acquire_console_sem();
3934 if (vc->vc_sw->con_font_default)
3935 rc = vc->vc_sw->con_font_default(vc, &font, s);
3936 else
3937 rc = -ENOSYS;
3938 release_console_sem();
3939 if (!rc) {
3940 op->width = font.width;
3941 op->height = font.height;
3942 }
3943 return rc;
3944 }
3945
3946 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3947 {
3948 int con = op->height;
3949 int rc;
3950
3951 if (vc->vc_mode != KD_TEXT)
3952 return -EINVAL;
3953
3954 acquire_console_sem();
3955 if (!vc->vc_sw->con_font_copy)
3956 rc = -ENOSYS;
3957 else if (con < 0 || !vc_cons_allocated(con))
3958 rc = -ENOTTY;
3959 else if (con == vc->vc_num) /* nothing to do */
3960 rc = 0;
3961 else
3962 rc = vc->vc_sw->con_font_copy(vc, con);
3963 release_console_sem();
3964 return rc;
3965 }
3966
3967 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3968 {
3969 switch (op->op) {
3970 case KD_FONT_OP_SET:
3971 return con_font_set(vc, op);
3972 case KD_FONT_OP_GET:
3973 return con_font_get(vc, op);
3974 case KD_FONT_OP_SET_DEFAULT:
3975 return con_font_default(vc, op);
3976 case KD_FONT_OP_COPY:
3977 return con_font_copy(vc, op);
3978 }
3979 return -ENOSYS;
3980 }
3981
3982 /*
3983 * Interface exported to selection and vcs.
3984 */
3985
3986 /* used by selection */
3987 u16 screen_glyph(struct vc_data *vc, int offset)
3988 {
3989 u16 w = scr_readw(screenpos(vc, offset, 1));
3990 u16 c = w & 0xff;
3991
3992 if (w & vc->vc_hi_font_mask)
3993 c |= 0x100;
3994 return c;
3995 }
3996
3997 /* used by vcs - note the word offset */
3998 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3999 {
4000 return screenpos(vc, 2 * w_offset, viewed);
4001 }
4002
4003 void getconsxy(struct vc_data *vc, unsigned char *p)
4004 {
4005 p[0] = vc->vc_x;
4006 p[1] = vc->vc_y;
4007 }
4008
4009 void putconsxy(struct vc_data *vc, unsigned char *p)
4010 {
4011 hide_cursor(vc);
4012 gotoxy(vc, p[0], p[1]);
4013 set_cursor(vc);
4014 }
4015
4016 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4017 {
4018 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4019 return softcursor_original;
4020 return scr_readw(org);
4021 }
4022
4023 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4024 {
4025 scr_writew(val, org);
4026 if ((unsigned long)org == vc->vc_pos) {
4027 softcursor_original = -1;
4028 add_softcursor(vc);
4029 }
4030 }
4031
4032 /*
4033 * Visible symbols for modules
4034 */
4035
4036 EXPORT_SYMBOL(color_table);
4037 EXPORT_SYMBOL(default_red);
4038 EXPORT_SYMBOL(default_grn);
4039 EXPORT_SYMBOL(default_blu);
4040 EXPORT_SYMBOL(update_region);
4041 EXPORT_SYMBOL(redraw_screen);
4042 EXPORT_SYMBOL(vc_resize);
4043 EXPORT_SYMBOL(vc_lock_resize);
4044 EXPORT_SYMBOL(fg_console);
4045 EXPORT_SYMBOL(console_blank_hook);
4046 EXPORT_SYMBOL(console_blanked);
4047 EXPORT_SYMBOL(vc_cons);
4048 #ifndef VT_SINGLE_DRIVER
4049 EXPORT_SYMBOL(take_over_console);
4050 EXPORT_SYMBOL(give_up_console);
4051 #endif
AMDTP streaming driver for the Linux FireWire stack (Juju)