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lcd: add platform_lcd driver
[linux-2.6/zen-sources.git] / drivers / char / vt.c
blobcb8c90da3934fa60bb08b47460271a2135878b68
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) && !console_blanked)
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_scrl_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_scrl_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 = _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 vc->vc_scrl_erase_char = (build_attr(vc, vc->vc_def_color, 1, false, false, vc->vc_decscnm, false) << 8) | ' ';
438 }
439
440 /* Note: inverting the screen twice should revert to the original state */
441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
442 {
443 unsigned short *p;
444
445 WARN_CONSOLE_UNLOCKED();
446
447 count /= 2;
448 p = screenpos(vc, offset, viewed);
449 if (vc->vc_sw->con_invert_region)
450 vc->vc_sw->con_invert_region(vc, p, count);
451 #ifndef VT_BUF_VRAM_ONLY
452 else {
453 u16 *q = p;
454 int cnt = count;
455 u16 a;
456
457 if (!vc->vc_can_do_color) {
458 while (cnt--) {
459 a = scr_readw(q);
460 a ^= 0x0800;
461 scr_writew(a, q);
462 q++;
463 }
464 } else if (vc->vc_hi_font_mask == 0x100) {
465 while (cnt--) {
466 a = scr_readw(q);
467 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
468 scr_writew(a, q);
469 q++;
470 }
471 } else {
472 while (cnt--) {
473 a = scr_readw(q);
474 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
475 scr_writew(a, q);
476 q++;
477 }
478 }
479 }
480 #endif
481 if (DO_UPDATE(vc))
482 do_update_region(vc, (unsigned long) p, count);
483 }
484
485 /* used by selection: complement pointer position */
486 void complement_pos(struct vc_data *vc, int offset)
487 {
488 static int old_offset = -1;
489 static unsigned short old;
490 static unsigned short oldx, oldy;
491
492 WARN_CONSOLE_UNLOCKED();
493
494 if (old_offset != -1 && old_offset >= 0 &&
495 old_offset < vc->vc_screenbuf_size) {
496 scr_writew(old, screenpos(vc, old_offset, 1));
497 if (DO_UPDATE(vc))
498 vc->vc_sw->con_putc(vc, old, oldy, oldx);
499 }
500
501 old_offset = offset;
502
503 if (offset != -1 && offset >= 0 &&
504 offset < vc->vc_screenbuf_size) {
505 unsigned short new;
506 unsigned short *p;
507 p = screenpos(vc, offset, 1);
508 old = scr_readw(p);
509 new = old ^ vc->vc_complement_mask;
510 scr_writew(new, p);
511 if (DO_UPDATE(vc)) {
512 oldx = (offset >> 1) % vc->vc_cols;
513 oldy = (offset >> 1) / vc->vc_cols;
514 vc->vc_sw->con_putc(vc, new, oldy, oldx);
515 }
516 }
517
518 }
519
520 static void insert_char(struct vc_data *vc, unsigned int nr)
521 {
522 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
523
524 p = q + vc->vc_cols - nr - vc->vc_x;
525 while (--p >= q)
526 scr_writew(scr_readw(p), p + nr);
527 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
528 vc->vc_need_wrap = 0;
529 if (DO_UPDATE(vc)) {
530 unsigned short oldattr = vc->vc_attr;
531 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
532 vc->vc_cols - vc->vc_x - nr);
533 vc->vc_attr = vc->vc_video_erase_char >> 8;
534 while (nr--)
535 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
536 vc->vc_attr = oldattr;
537 }
538 }
539
540 static void delete_char(struct vc_data *vc, unsigned int nr)
541 {
542 unsigned int i = vc->vc_x;
543 unsigned short *p = (unsigned short *)vc->vc_pos;
544
545 while (++i <= vc->vc_cols - nr) {
546 scr_writew(scr_readw(p+nr), p);
547 p++;
548 }
549 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
550 vc->vc_need_wrap = 0;
551 if (DO_UPDATE(vc)) {
552 unsigned short oldattr = vc->vc_attr;
553 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
554 vc->vc_cols - vc->vc_x - nr);
555 vc->vc_attr = vc->vc_video_erase_char >> 8;
556 while (nr--)
557 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
558 vc->vc_cols - 1 - nr);
559 vc->vc_attr = oldattr;
560 }
561 }
562
563 static int softcursor_original;
564
565 static void add_softcursor(struct vc_data *vc)
566 {
567 int i = scr_readw((u16 *) vc->vc_pos);
568 u32 type = vc->vc_cursor_type;
569
570 if (! (type & 0x10)) return;
571 if (softcursor_original != -1) return;
572 softcursor_original = i;
573 i |= ((type >> 8) & 0xff00 );
574 i ^= ((type) & 0xff00 );
575 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577 scr_writew(i, (u16 *) vc->vc_pos);
578 if (DO_UPDATE(vc))
579 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
580 }
581
582 static void hide_softcursor(struct vc_data *vc)
583 {
584 if (softcursor_original != -1) {
585 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, softcursor_original,
588 vc->vc_y, vc->vc_x);
589 softcursor_original = -1;
590 }
591 }
592
593 static void hide_cursor(struct vc_data *vc)
594 {
595 if (vc == sel_cons)
596 clear_selection();
597 vc->vc_sw->con_cursor(vc, CM_ERASE);
598 hide_softcursor(vc);
599 }
600
601 static void set_cursor(struct vc_data *vc)
602 {
603 if (!IS_FG(vc) || console_blanked ||
604 vc->vc_mode == KD_GRAPHICS)
605 return;
606 if (vc->vc_deccm) {
607 if (vc == sel_cons)
608 clear_selection();
609 add_softcursor(vc);
610 if ((vc->vc_cursor_type & 0x0f) != 1)
611 vc->vc_sw->con_cursor(vc, CM_DRAW);
612 } else
613 hide_cursor(vc);
614 }
615
616 static void set_origin(struct vc_data *vc)
617 {
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!CON_IS_VISIBLE(vc) ||
621 !vc->vc_sw->con_set_origin ||
622 !vc->vc_sw->con_set_origin(vc))
623 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624 vc->vc_visible_origin = vc->vc_origin;
625 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
627 }
628
629 static inline void save_screen(struct vc_data *vc)
630 {
631 WARN_CONSOLE_UNLOCKED();
632
633 if (vc->vc_sw->con_save_screen)
634 vc->vc_sw->con_save_screen(vc);
635 }
636
637 /*
638 * Redrawing of screen
639 */
640
641 static void clear_buffer_attributes(struct vc_data *vc)
642 {
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
646
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
649 }
650 }
651
652 void redraw_screen(struct vc_data *vc, int is_switch)
653 {
654 int redraw = 0;
655
656 WARN_CONSOLE_UNLOCKED();
657
658 if (!vc) {
659 /* strange ... */
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
661 return;
662 }
663
664 if (is_switch) {
665 struct vc_data *old_vc = vc_cons[fg_console].d;
666 if (old_vc == vc)
667 return;
668 if (!CON_IS_VISIBLE(vc))
669 redraw = 1;
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
672 hide_cursor(old_vc);
673 if (!CON_IS_VISIBLE(old_vc)) {
674 save_screen(old_vc);
675 set_origin(old_vc);
676 }
677 } else {
678 hide_cursor(vc);
679 redraw = 1;
680 }
681
682 if (redraw) {
683 int update;
684 int old_was_color = vc->vc_can_do_color;
685
686 set_origin(vc);
687 update = vc->vc_sw->con_switch(vc);
688 set_palette(vc);
689 /*
690 * If console changed from mono<->color, the best we can do
691 * is to clear the buffer attributes. As it currently stands,
692 * rebuilding new attributes from the old buffer is not doable
693 * without overly complex code.
694 */
695 if (old_was_color != vc->vc_can_do_color) {
696 update_attr(vc);
697 clear_buffer_attributes(vc);
698 }
699 if (update && vc->vc_mode != KD_GRAPHICS)
700 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
701 }
702 set_cursor(vc);
703 if (is_switch) {
704 set_leds();
705 compute_shiftstate();
706 notify_update(vc);
707 }
708 }
709
710 /*
711 * Allocation, freeing and resizing of VTs.
712 */
713
714 int vc_cons_allocated(unsigned int i)
715 {
716 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
717 }
718
719 static void visual_init(struct vc_data *vc, int num, int init)
720 {
721 /* ++Geert: vc->vc_sw->con_init determines console size */
722 if (vc->vc_sw)
723 module_put(vc->vc_sw->owner);
724 vc->vc_sw = conswitchp;
725 #ifndef VT_SINGLE_DRIVER
726 if (con_driver_map[num])
727 vc->vc_sw = con_driver_map[num];
728 #endif
729 __module_get(vc->vc_sw->owner);
730 vc->vc_num = num;
731 vc->vc_display_fg = &master_display_fg;
732 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
733 vc->vc_uni_pagedir = 0;
734 vc->vc_hi_font_mask = 0;
735 vc->vc_complement_mask = 0;
736 vc->vc_can_do_color = 0;
737 vc->vc_sw->con_init(vc, init);
738 if (!vc->vc_complement_mask)
739 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
740 vc->vc_s_complement_mask = vc->vc_complement_mask;
741 vc->vc_size_row = vc->vc_cols << 1;
742 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
743 }
744
745 int vc_allocate(unsigned int currcons) /* return 0 on success */
746 {
747 WARN_CONSOLE_UNLOCKED();
748
749 if (currcons >= MAX_NR_CONSOLES)
750 return -ENXIO;
751 if (!vc_cons[currcons].d) {
752 struct vc_data *vc;
753 struct vt_notifier_param param;
754
755 /* prevent users from taking too much memory */
756 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
757 return -EPERM;
758
759 /* due to the granularity of kmalloc, we waste some memory here */
760 /* the alloc is done in two steps, to optimize the common situation
761 of a 25x80 console (structsize=216, screenbuf_size=4000) */
762 /* although the numbers above are not valid since long ago, the
763 point is still up-to-date and the comment still has its value
764 even if only as a historical artifact. --mj, July 1998 */
765 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
766 if (!vc)
767 return -ENOMEM;
768 vc_cons[currcons].d = vc;
769 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
770 visual_init(vc, currcons, 1);
771 if (!*vc->vc_uni_pagedir_loc)
772 con_set_default_unimap(vc);
773 if (!vc->vc_kmalloced)
774 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
775 if (!vc->vc_screenbuf) {
776 kfree(vc);
777 vc_cons[currcons].d = NULL;
778 return -ENOMEM;
779 }
780 vc->vc_kmalloced = 1;
781 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
782 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
783 }
784 return 0;
785 }
786
787 static inline int resize_screen(struct vc_data *vc, int width, int height,
788 int user)
789 {
790 /* Resizes the resolution of the display adapater */
791 int err = 0;
792
793 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
794 err = vc->vc_sw->con_resize(vc, width, height, user);
795
796 return err;
797 }
798
799 /*
800 * Change # of rows and columns (0 means unchanged/the size of fg_console)
801 * [this is to be used together with some user program
802 * like resize that changes the hardware videomode]
803 */
804 #define VC_RESIZE_MAXCOL (32767)
805 #define VC_RESIZE_MAXROW (32767)
806 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
807 {
808 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
809 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
810 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
811 unsigned int end, user;
812 unsigned short *newscreen;
813
814 WARN_CONSOLE_UNLOCKED();
815
816 if (!vc)
817 return -ENXIO;
818
819 user = vc->vc_resize_user;
820 vc->vc_resize_user = 0;
821
822 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
823 return -EINVAL;
824
825 new_cols = (cols ? cols : vc->vc_cols);
826 new_rows = (lines ? lines : vc->vc_rows);
827 new_row_size = new_cols << 1;
828 new_screen_size = new_row_size * new_rows;
829
830 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
831 return 0;
832
833 newscreen = kmalloc(new_screen_size, GFP_USER);
834 if (!newscreen)
835 return -ENOMEM;
836
837 old_rows = vc->vc_rows;
838 old_cols = vc->vc_cols;
839 old_row_size = vc->vc_size_row;
840 old_screen_size = vc->vc_screenbuf_size;
841
842 err = resize_screen(vc, new_cols, new_rows, user);
843 if (err) {
844 kfree(newscreen);
845 return err;
846 }
847
848 vc->vc_rows = new_rows;
849 vc->vc_cols = new_cols;
850 vc->vc_size_row = new_row_size;
851 vc->vc_screenbuf_size = new_screen_size;
852
853 rlth = min(old_row_size, new_row_size);
854 rrem = new_row_size - rlth;
855 old_origin = vc->vc_origin;
856 new_origin = (long) newscreen;
857 new_scr_end = new_origin + new_screen_size;
858
859 if (vc->vc_y > new_rows) {
860 if (old_rows - vc->vc_y < new_rows) {
861 /*
862 * Cursor near the bottom, copy contents from the
863 * bottom of buffer
864 */
865 old_origin += (old_rows - new_rows) * old_row_size;
866 end = vc->vc_scr_end;
867 } else {
868 /*
869 * Cursor is in no man's land, copy 1/2 screenful
870 * from the top and bottom of cursor position
871 */
872 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
873 end = old_origin + (old_row_size * new_rows);
874 }
875 } else
876 /*
877 * Cursor near the top, copy contents from the top of buffer
878 */
879 end = (old_rows > new_rows) ? old_origin +
880 (old_row_size * new_rows) :
881 vc->vc_scr_end;
882
883 update_attr(vc);
884
885 while (old_origin < end) {
886 scr_memcpyw((unsigned short *) new_origin,
887 (unsigned short *) old_origin, rlth);
888 if (rrem)
889 scr_memsetw((void *)(new_origin + rlth),
890 vc->vc_video_erase_char, rrem);
891 old_origin += old_row_size;
892 new_origin += new_row_size;
893 }
894 if (new_scr_end > new_origin)
895 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
896 new_scr_end - new_origin);
897 if (vc->vc_kmalloced)
898 kfree(vc->vc_screenbuf);
899 vc->vc_screenbuf = newscreen;
900 vc->vc_kmalloced = 1;
901 vc->vc_screenbuf_size = new_screen_size;
902 set_origin(vc);
903
904 /* do part of a reset_terminal() */
905 vc->vc_top = 0;
906 vc->vc_bottom = vc->vc_rows;
907 gotoxy(vc, vc->vc_x, vc->vc_y);
908 save_cur(vc);
909
910 if (vc->vc_tty) {
911 struct winsize ws, *cws = &vc->vc_tty->winsize;
912 struct pid *pgrp = NULL;
913
914 memset(&ws, 0, sizeof(ws));
915 ws.ws_row = vc->vc_rows;
916 ws.ws_col = vc->vc_cols;
917 ws.ws_ypixel = vc->vc_scan_lines;
918
919 mutex_lock(&vc->vc_tty->termios_mutex);
920 spin_lock_irq(&vc->vc_tty->ctrl_lock);
921 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col))
922 pgrp = get_pid(vc->vc_tty->pgrp);
923 spin_unlock_irq(&vc->vc_tty->ctrl_lock);
924 if (pgrp) {
925 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
926 put_pid(pgrp);
927 }
928 *cws = ws;
929 mutex_unlock(&vc->vc_tty->termios_mutex);
930 }
931
932 if (CON_IS_VISIBLE(vc))
933 update_screen(vc);
934 return err;
935 }
936
937 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
938 {
939 int rc;
940
941 acquire_console_sem();
942 rc = vc_resize(vc, cols, lines);
943 release_console_sem();
944 return rc;
945 }
946
947 void vc_deallocate(unsigned int currcons)
948 {
949 WARN_CONSOLE_UNLOCKED();
950
951 if (vc_cons_allocated(currcons)) {
952 struct vc_data *vc = vc_cons[currcons].d;
953 struct vt_notifier_param param = { .vc = vc };
954 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
955 vc->vc_sw->con_deinit(vc);
956 put_pid(vc->vt_pid);
957 module_put(vc->vc_sw->owner);
958 if (vc->vc_kmalloced)
959 kfree(vc->vc_screenbuf);
960 if (currcons >= MIN_NR_CONSOLES)
961 kfree(vc);
962 vc_cons[currcons].d = NULL;
963 }
964 }
965
966 /*
967 * VT102 emulator
968 */
969
970 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
971 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
972 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
973
974 #define decarm VC_REPEAT
975 #define decckm VC_CKMODE
976 #define kbdapplic VC_APPLIC
977 #define lnm VC_CRLF
978
979 /*
980 * this is what the terminal answers to a ESC-Z or csi0c query.
981 */
982 #define VT100ID "\033[?1;2c"
983 #define VT102ID "\033[?6c"
984
985 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
986 8,12,10,14, 9,13,11,15 };
987
988 /* the default colour table, for VGA+ colour systems */
989 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
990 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
991 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
992 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
993 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
994 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
995
996 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
997 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
998 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
999
1000 /*
1001 * gotoxy() must verify all boundaries, because the arguments
1002 * might also be negative. If the given position is out of
1003 * bounds, the cursor is placed at the nearest margin.
1004 */
1005 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1006 {
1007 int min_y, max_y;
1008
1009 if (new_x < 0)
1010 vc->vc_x = 0;
1011 else {
1012 if (new_x >= vc->vc_cols)
1013 vc->vc_x = vc->vc_cols - 1;
1014 else
1015 vc->vc_x = new_x;
1016 }
1017
1018 if (vc->vc_decom) {
1019 min_y = vc->vc_top;
1020 max_y = vc->vc_bottom;
1021 } else {
1022 min_y = 0;
1023 max_y = vc->vc_rows;
1024 }
1025 if (new_y < min_y)
1026 vc->vc_y = min_y;
1027 else if (new_y >= max_y)
1028 vc->vc_y = max_y - 1;
1029 else
1030 vc->vc_y = new_y;
1031 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1032 vc->vc_need_wrap = 0;
1033 }
1034
1035 /* for absolute user moves, when decom is set */
1036 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1037 {
1038 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1039 }
1040
1041 void scrollback(struct vc_data *vc, int lines)
1042 {
1043 if (!lines)
1044 lines = vc->vc_rows / 2;
1045 scrolldelta(-lines);
1046 }
1047
1048 void scrollfront(struct vc_data *vc, int lines)
1049 {
1050 if (!lines)
1051 lines = vc->vc_rows / 2;
1052 scrolldelta(lines);
1053 }
1054
1055 static void lf(struct vc_data *vc)
1056 {
1057 /* don't scroll if above bottom of scrolling region, or
1058 * if below scrolling region
1059 */
1060 if (vc->vc_y + 1 == vc->vc_bottom)
1061 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1062 else if (vc->vc_y < vc->vc_rows - 1) {
1063 vc->vc_y++;
1064 vc->vc_pos += vc->vc_size_row;
1065 }
1066 vc->vc_need_wrap = 0;
1067 notify_write(vc, '\n');
1068 }
1069
1070 static void ri(struct vc_data *vc)
1071 {
1072 /* don't scroll if below top of scrolling region, or
1073 * if above scrolling region
1074 */
1075 if (vc->vc_y == vc->vc_top)
1076 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1077 else if (vc->vc_y > 0) {
1078 vc->vc_y--;
1079 vc->vc_pos -= vc->vc_size_row;
1080 }
1081 vc->vc_need_wrap = 0;
1082 }
1083
1084 static inline void cr(struct vc_data *vc)
1085 {
1086 vc->vc_pos -= vc->vc_x << 1;
1087 vc->vc_need_wrap = vc->vc_x = 0;
1088 notify_write(vc, '\r');
1089 }
1090
1091 static inline void bs(struct vc_data *vc)
1092 {
1093 if (vc->vc_x) {
1094 vc->vc_pos -= 2;
1095 vc->vc_x--;
1096 vc->vc_need_wrap = 0;
1097 notify_write(vc, '\b');
1098 }
1099 }
1100
1101 static inline void del(struct vc_data *vc)
1102 {
1103 /* ignored */
1104 }
1105
1106 static void csi_J(struct vc_data *vc, int vpar)
1107 {
1108 unsigned int count;
1109 unsigned short * start;
1110
1111 switch (vpar) {
1112 case 0: /* erase from cursor to end of display */
1113 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1114 start = (unsigned short *)vc->vc_pos;
1115 if (DO_UPDATE(vc)) {
1116 /* do in two stages */
1117 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1118 vc->vc_cols - vc->vc_x);
1119 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1120 vc->vc_rows - vc->vc_y - 1,
1121 vc->vc_cols);
1122 }
1123 break;
1124 case 1: /* erase from start to cursor */
1125 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1126 start = (unsigned short *)vc->vc_origin;
1127 if (DO_UPDATE(vc)) {
1128 /* do in two stages */
1129 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1130 vc->vc_cols);
1131 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1132 vc->vc_x + 1);
1133 }
1134 break;
1135 case 2: /* erase whole display */
1136 count = vc->vc_cols * vc->vc_rows;
1137 start = (unsigned short *)vc->vc_origin;
1138 if (DO_UPDATE(vc))
1139 vc->vc_sw->con_clear(vc, 0, 0,
1140 vc->vc_rows,
1141 vc->vc_cols);
1142 break;
1143 default:
1144 return;
1145 }
1146 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1147 vc->vc_need_wrap = 0;
1148 }
1149
1150 static void csi_K(struct vc_data *vc, int vpar)
1151 {
1152 unsigned int count;
1153 unsigned short * start;
1154
1155 switch (vpar) {
1156 case 0: /* erase from cursor to end of line */
1157 count = vc->vc_cols - vc->vc_x;
1158 start = (unsigned short *)vc->vc_pos;
1159 if (DO_UPDATE(vc))
1160 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1161 vc->vc_cols - vc->vc_x);
1162 break;
1163 case 1: /* erase from start of line to cursor */
1164 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1165 count = vc->vc_x + 1;
1166 if (DO_UPDATE(vc))
1167 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1168 vc->vc_x + 1);
1169 break;
1170 case 2: /* erase whole line */
1171 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1172 count = vc->vc_cols;
1173 if (DO_UPDATE(vc))
1174 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1175 vc->vc_cols);
1176 break;
1177 default:
1178 return;
1179 }
1180 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1181 vc->vc_need_wrap = 0;
1182 }
1183
1184 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1185 { /* not vt100? */
1186 int count;
1187
1188 if (!vpar)
1189 vpar++;
1190 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1191
1192 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1193 if (DO_UPDATE(vc))
1194 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1195 vc->vc_need_wrap = 0;
1196 }
1197
1198 static void default_attr(struct vc_data *vc)
1199 {
1200 vc->vc_intensity = 1;
1201 vc->vc_italic = 0;
1202 vc->vc_underline = 0;
1203 vc->vc_reverse = 0;
1204 vc->vc_blink = 0;
1205 vc->vc_color = vc->vc_def_color;
1206 }
1207
1208 /* console_sem is held */
1209 static void csi_m(struct vc_data *vc)
1210 {
1211 int i;
1212
1213 for (i = 0; i <= vc->vc_npar; i++)
1214 switch (vc->vc_par[i]) {
1215 case 0: /* all attributes off */
1216 default_attr(vc);
1217 break;
1218 case 1:
1219 vc->vc_intensity = 2;
1220 break;
1221 case 2:
1222 vc->vc_intensity = 0;
1223 break;
1224 case 3:
1225 vc->vc_italic = 1;
1226 break;
1227 case 4:
1228 vc->vc_underline = 1;
1229 break;
1230 case 5:
1231 vc->vc_blink = 1;
1232 break;
1233 case 7:
1234 vc->vc_reverse = 1;
1235 break;
1236 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1237 * Select primary font, don't display
1238 * control chars if defined, don't set
1239 * bit 8 on output.
1240 */
1241 vc->vc_translate = set_translate(vc->vc_charset == 0
1242 ? vc->vc_G0_charset
1243 : vc->vc_G1_charset, vc);
1244 vc->vc_disp_ctrl = 0;
1245 vc->vc_toggle_meta = 0;
1246 break;
1247 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1248 * Select first alternate font, lets
1249 * chars < 32 be displayed as ROM chars.
1250 */
1251 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1252 vc->vc_disp_ctrl = 1;
1253 vc->vc_toggle_meta = 0;
1254 break;
1255 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1256 * Select second alternate font, toggle
1257 * high bit before displaying as ROM char.
1258 */
1259 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1260 vc->vc_disp_ctrl = 1;
1261 vc->vc_toggle_meta = 1;
1262 break;
1263 case 21:
1264 case 22:
1265 vc->vc_intensity = 1;
1266 break;
1267 case 23:
1268 vc->vc_italic = 0;
1269 break;
1270 case 24:
1271 vc->vc_underline = 0;
1272 break;
1273 case 25:
1274 vc->vc_blink = 0;
1275 break;
1276 case 27:
1277 vc->vc_reverse = 0;
1278 break;
1279 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1280 * Enables underscore, white foreground
1281 * with white underscore (Linux - use
1282 * default foreground).
1283 */
1284 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1285 vc->vc_underline = 1;
1286 break;
1287 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1288 * Disable underline option.
1289 * Reset colour to default? It did this
1290 * before...
1291 */
1292 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1293 vc->vc_underline = 0;
1294 break;
1295 case 49:
1296 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1297 break;
1298 default:
1299 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1300 vc->vc_color = color_table[vc->vc_par[i] - 30]
1301 | (vc->vc_color & 0xf0);
1302 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1303 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1304 | (vc->vc_color & 0x0f);
1305 break;
1306 }
1307 update_attr(vc);
1308 }
1309
1310 static void respond_string(const char *p, struct tty_struct *tty)
1311 {
1312 while (*p) {
1313 tty_insert_flip_char(tty, *p, 0);
1314 p++;
1315 }
1316 con_schedule_flip(tty);
1317 }
1318
1319 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1320 {
1321 char buf[40];
1322
1323 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1324 respond_string(buf, tty);
1325 }
1326
1327 static inline void status_report(struct tty_struct *tty)
1328 {
1329 respond_string("\033[0n", tty); /* Terminal ok */
1330 }
1331
1332 static inline void respond_ID(struct tty_struct * tty)
1333 {
1334 respond_string(VT102ID, tty);
1335 }
1336
1337 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1338 {
1339 char buf[8];
1340
1341 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1342 (char)('!' + mry));
1343 respond_string(buf, tty);
1344 }
1345
1346 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1347 int mouse_reporting(void)
1348 {
1349 return vc_cons[fg_console].d->vc_report_mouse;
1350 }
1351
1352 /* console_sem is held */
1353 static void set_mode(struct vc_data *vc, int on_off)
1354 {
1355 int i;
1356
1357 for (i = 0; i <= vc->vc_npar; i++)
1358 if (vc->vc_ques) {
1359 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1360 case 1: /* Cursor keys send ^[Ox/^[[x */
1361 if (on_off)
1362 set_kbd(vc, decckm);
1363 else
1364 clr_kbd(vc, decckm);
1365 break;
1366 case 3: /* 80/132 mode switch unimplemented */
1367 vc->vc_deccolm = on_off;
1368 #if 0
1369 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1370 /* this alone does not suffice; some user mode
1371 utility has to change the hardware regs */
1372 #endif
1373 break;
1374 case 5: /* Inverted screen on/off */
1375 if (vc->vc_decscnm != on_off) {
1376 vc->vc_decscnm = on_off;
1377 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1378 update_attr(vc);
1379 }
1380 break;
1381 case 6: /* Origin relative/absolute */
1382 vc->vc_decom = on_off;
1383 gotoxay(vc, 0, 0);
1384 break;
1385 case 7: /* Autowrap on/off */
1386 vc->vc_decawm = on_off;
1387 break;
1388 case 8: /* Autorepeat on/off */
1389 if (on_off)
1390 set_kbd(vc, decarm);
1391 else
1392 clr_kbd(vc, decarm);
1393 break;
1394 case 9:
1395 vc->vc_report_mouse = on_off ? 1 : 0;
1396 break;
1397 case 25: /* Cursor on/off */
1398 vc->vc_deccm = on_off;
1399 break;
1400 case 1000:
1401 vc->vc_report_mouse = on_off ? 2 : 0;
1402 break;
1403 }
1404 } else {
1405 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1406 case 3: /* Monitor (display ctrls) */
1407 vc->vc_disp_ctrl = on_off;
1408 break;
1409 case 4: /* Insert Mode on/off */
1410 vc->vc_decim = on_off;
1411 break;
1412 case 20: /* Lf, Enter == CrLf/Lf */
1413 if (on_off)
1414 set_kbd(vc, lnm);
1415 else
1416 clr_kbd(vc, lnm);
1417 break;
1418 }
1419 }
1420 }
1421
1422 /* console_sem is held */
1423 static void setterm_command(struct vc_data *vc)
1424 {
1425 switch(vc->vc_par[0]) {
1426 case 1: /* set color for underline mode */
1427 if (vc->vc_can_do_color &&
1428 vc->vc_par[1] < 16) {
1429 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1430 if (vc->vc_underline)
1431 update_attr(vc);
1432 }
1433 break;
1434 case 2: /* set color for half intensity mode */
1435 if (vc->vc_can_do_color &&
1436 vc->vc_par[1] < 16) {
1437 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1438 if (vc->vc_intensity == 0)
1439 update_attr(vc);
1440 }
1441 break;
1442 case 8: /* store colors as defaults */
1443 vc->vc_def_color = vc->vc_attr;
1444 if (vc->vc_hi_font_mask == 0x100)
1445 vc->vc_def_color >>= 1;
1446 default_attr(vc);
1447 update_attr(vc);
1448 break;
1449 case 9: /* set blanking interval */
1450 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1451 poke_blanked_console();
1452 break;
1453 case 10: /* set bell frequency in Hz */
1454 if (vc->vc_npar >= 1)
1455 vc->vc_bell_pitch = vc->vc_par[1];
1456 else
1457 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1458 break;
1459 case 11: /* set bell duration in msec */
1460 if (vc->vc_npar >= 1)
1461 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1462 vc->vc_par[1] * HZ / 1000 : 0;
1463 else
1464 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1465 break;
1466 case 12: /* bring specified console to the front */
1467 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1468 set_console(vc->vc_par[1] - 1);
1469 break;
1470 case 13: /* unblank the screen */
1471 poke_blanked_console();
1472 break;
1473 case 14: /* set vesa powerdown interval */
1474 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1475 break;
1476 case 15: /* activate the previous console */
1477 set_console(last_console);
1478 break;
1479 }
1480 }
1481
1482 /* console_sem is held */
1483 static void csi_at(struct vc_data *vc, unsigned int nr)
1484 {
1485 if (nr > vc->vc_cols - vc->vc_x)
1486 nr = vc->vc_cols - vc->vc_x;
1487 else if (!nr)
1488 nr = 1;
1489 insert_char(vc, nr);
1490 }
1491
1492 /* console_sem is held */
1493 static void csi_L(struct vc_data *vc, unsigned int nr)
1494 {
1495 if (nr > vc->vc_rows - vc->vc_y)
1496 nr = vc->vc_rows - vc->vc_y;
1497 else if (!nr)
1498 nr = 1;
1499 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1500 vc->vc_need_wrap = 0;
1501 }
1502
1503 /* console_sem is held */
1504 static void csi_P(struct vc_data *vc, unsigned int nr)
1505 {
1506 if (nr > vc->vc_cols - vc->vc_x)
1507 nr = vc->vc_cols - vc->vc_x;
1508 else if (!nr)
1509 nr = 1;
1510 delete_char(vc, nr);
1511 }
1512
1513 /* console_sem is held */
1514 static void csi_M(struct vc_data *vc, unsigned int nr)
1515 {
1516 if (nr > vc->vc_rows - vc->vc_y)
1517 nr = vc->vc_rows - vc->vc_y;
1518 else if (!nr)
1519 nr=1;
1520 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1521 vc->vc_need_wrap = 0;
1522 }
1523
1524 /* console_sem is held (except via vc_init->reset_terminal */
1525 static void save_cur(struct vc_data *vc)
1526 {
1527 vc->vc_saved_x = vc->vc_x;
1528 vc->vc_saved_y = vc->vc_y;
1529 vc->vc_s_intensity = vc->vc_intensity;
1530 vc->vc_s_italic = vc->vc_italic;
1531 vc->vc_s_underline = vc->vc_underline;
1532 vc->vc_s_blink = vc->vc_blink;
1533 vc->vc_s_reverse = vc->vc_reverse;
1534 vc->vc_s_charset = vc->vc_charset;
1535 vc->vc_s_color = vc->vc_color;
1536 vc->vc_saved_G0 = vc->vc_G0_charset;
1537 vc->vc_saved_G1 = vc->vc_G1_charset;
1538 }
1539
1540 /* console_sem is held */
1541 static void restore_cur(struct vc_data *vc)
1542 {
1543 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1544 vc->vc_intensity = vc->vc_s_intensity;
1545 vc->vc_italic = vc->vc_s_italic;
1546 vc->vc_underline = vc->vc_s_underline;
1547 vc->vc_blink = vc->vc_s_blink;
1548 vc->vc_reverse = vc->vc_s_reverse;
1549 vc->vc_charset = vc->vc_s_charset;
1550 vc->vc_color = vc->vc_s_color;
1551 vc->vc_G0_charset = vc->vc_saved_G0;
1552 vc->vc_G1_charset = vc->vc_saved_G1;
1553 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1554 update_attr(vc);
1555 vc->vc_need_wrap = 0;
1556 }
1557
1558 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1559 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1560 ESpalette };
1561
1562 /* console_sem is held (except via vc_init()) */
1563 static void reset_terminal(struct vc_data *vc, int do_clear)
1564 {
1565 vc->vc_top = 0;
1566 vc->vc_bottom = vc->vc_rows;
1567 vc->vc_state = ESnormal;
1568 vc->vc_ques = 0;
1569 vc->vc_translate = set_translate(LAT1_MAP, vc);
1570 vc->vc_G0_charset = LAT1_MAP;
1571 vc->vc_G1_charset = GRAF_MAP;
1572 vc->vc_charset = 0;
1573 vc->vc_need_wrap = 0;
1574 vc->vc_report_mouse = 0;
1575 vc->vc_utf = default_utf8;
1576 vc->vc_utf_count = 0;
1577
1578 vc->vc_disp_ctrl = 0;
1579 vc->vc_toggle_meta = 0;
1580
1581 vc->vc_decscnm = 0;
1582 vc->vc_decom = 0;
1583 vc->vc_decawm = 1;
1584 vc->vc_deccm = 1;
1585 vc->vc_decim = 0;
1586
1587 set_kbd(vc, decarm);
1588 clr_kbd(vc, decckm);
1589 clr_kbd(vc, kbdapplic);
1590 clr_kbd(vc, lnm);
1591 kbd_table[vc->vc_num].lockstate = 0;
1592 kbd_table[vc->vc_num].slockstate = 0;
1593 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1594 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1595 /* do not do set_leds here because this causes an endless tasklet loop
1596 when the keyboard hasn't been initialized yet */
1597
1598 vc->vc_cursor_type = CUR_DEFAULT;
1599 vc->vc_complement_mask = vc->vc_s_complement_mask;
1600
1601 default_attr(vc);
1602 update_attr(vc);
1603
1604 vc->vc_tab_stop[0] = 0x01010100;
1605 vc->vc_tab_stop[1] =
1606 vc->vc_tab_stop[2] =
1607 vc->vc_tab_stop[3] =
1608 vc->vc_tab_stop[4] = 0x01010101;
1609
1610 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1611 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1612
1613 gotoxy(vc, 0, 0);
1614 save_cur(vc);
1615 if (do_clear)
1616 csi_J(vc, 2);
1617 }
1618
1619 /* console_sem is held */
1620 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1621 {
1622 /*
1623 * Control characters can be used in the _middle_
1624 * of an escape sequence.
1625 */
1626 switch (c) {
1627 case 0:
1628 return;
1629 case 7:
1630 if (vc->vc_bell_duration)
1631 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1632 return;
1633 case 8:
1634 bs(vc);
1635 return;
1636 case 9:
1637 vc->vc_pos -= (vc->vc_x << 1);
1638 while (vc->vc_x < vc->vc_cols - 1) {
1639 vc->vc_x++;
1640 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1641 break;
1642 }
1643 vc->vc_pos += (vc->vc_x << 1);
1644 notify_write(vc, '\t');
1645 return;
1646 case 10: case 11: case 12:
1647 lf(vc);
1648 if (!is_kbd(vc, lnm))
1649 return;
1650 case 13:
1651 cr(vc);
1652 return;
1653 case 14:
1654 vc->vc_charset = 1;
1655 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1656 vc->vc_disp_ctrl = 1;
1657 return;
1658 case 15:
1659 vc->vc_charset = 0;
1660 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1661 vc->vc_disp_ctrl = 0;
1662 return;
1663 case 24: case 26:
1664 vc->vc_state = ESnormal;
1665 return;
1666 case 27:
1667 vc->vc_state = ESesc;
1668 return;
1669 case 127:
1670 del(vc);
1671 return;
1672 case 128+27:
1673 vc->vc_state = ESsquare;
1674 return;
1675 }
1676 switch(vc->vc_state) {
1677 case ESesc:
1678 vc->vc_state = ESnormal;
1679 switch (c) {
1680 case '[':
1681 vc->vc_state = ESsquare;
1682 return;
1683 case ']':
1684 vc->vc_state = ESnonstd;
1685 return;
1686 case '%':
1687 vc->vc_state = ESpercent;
1688 return;
1689 case 'E':
1690 cr(vc);
1691 lf(vc);
1692 return;
1693 case 'M':
1694 ri(vc);
1695 return;
1696 case 'D':
1697 lf(vc);
1698 return;
1699 case 'H':
1700 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1701 return;
1702 case 'Z':
1703 respond_ID(tty);
1704 return;
1705 case '7':
1706 save_cur(vc);
1707 return;
1708 case '8':
1709 restore_cur(vc);
1710 return;
1711 case '(':
1712 vc->vc_state = ESsetG0;
1713 return;
1714 case ')':
1715 vc->vc_state = ESsetG1;
1716 return;
1717 case '#':
1718 vc->vc_state = EShash;
1719 return;
1720 case 'c':
1721 reset_terminal(vc, 1);
1722 return;
1723 case '>': /* Numeric keypad */
1724 clr_kbd(vc, kbdapplic);
1725 return;
1726 case '=': /* Appl. keypad */
1727 set_kbd(vc, kbdapplic);
1728 return;
1729 }
1730 return;
1731 case ESnonstd:
1732 if (c=='P') { /* palette escape sequence */
1733 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1734 vc->vc_par[vc->vc_npar] = 0;
1735 vc->vc_npar = 0;
1736 vc->vc_state = ESpalette;
1737 return;
1738 } else if (c=='R') { /* reset palette */
1739 reset_palette(vc);
1740 vc->vc_state = ESnormal;
1741 } else
1742 vc->vc_state = ESnormal;
1743 return;
1744 case ESpalette:
1745 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1746 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1747 if (vc->vc_npar == 7) {
1748 int i = vc->vc_par[0] * 3, j = 1;
1749 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1750 vc->vc_palette[i++] += vc->vc_par[j++];
1751 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1752 vc->vc_palette[i++] += vc->vc_par[j++];
1753 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1754 vc->vc_palette[i] += vc->vc_par[j];
1755 set_palette(vc);
1756 vc->vc_state = ESnormal;
1757 }
1758 } else
1759 vc->vc_state = ESnormal;
1760 return;
1761 case ESsquare:
1762 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1763 vc->vc_par[vc->vc_npar] = 0;
1764 vc->vc_npar = 0;
1765 vc->vc_state = ESgetpars;
1766 if (c == '[') { /* Function key */
1767 vc->vc_state=ESfunckey;
1768 return;
1769 }
1770 vc->vc_ques = (c == '?');
1771 if (vc->vc_ques)
1772 return;
1773 case ESgetpars:
1774 if (c == ';' && vc->vc_npar < NPAR - 1) {
1775 vc->vc_npar++;
1776 return;
1777 } else if (c>='0' && c<='9') {
1778 vc->vc_par[vc->vc_npar] *= 10;
1779 vc->vc_par[vc->vc_npar] += c - '0';
1780 return;
1781 } else
1782 vc->vc_state = ESgotpars;
1783 case ESgotpars:
1784 vc->vc_state = ESnormal;
1785 switch(c) {
1786 case 'h':
1787 set_mode(vc, 1);
1788 return;
1789 case 'l':
1790 set_mode(vc, 0);
1791 return;
1792 case 'c':
1793 if (vc->vc_ques) {
1794 if (vc->vc_par[0])
1795 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1796 else
1797 vc->vc_cursor_type = CUR_DEFAULT;
1798 return;
1799 }
1800 break;
1801 case 'm':
1802 if (vc->vc_ques) {
1803 clear_selection();
1804 if (vc->vc_par[0])
1805 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1806 else
1807 vc->vc_complement_mask = vc->vc_s_complement_mask;
1808 return;
1809 }
1810 break;
1811 case 'n':
1812 if (!vc->vc_ques) {
1813 if (vc->vc_par[0] == 5)
1814 status_report(tty);
1815 else if (vc->vc_par[0] == 6)
1816 cursor_report(vc, tty);
1817 }
1818 return;
1819 }
1820 if (vc->vc_ques) {
1821 vc->vc_ques = 0;
1822 return;
1823 }
1824 switch(c) {
1825 case 'G': case '`':
1826 if (vc->vc_par[0])
1827 vc->vc_par[0]--;
1828 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1829 return;
1830 case 'A':
1831 if (!vc->vc_par[0])
1832 vc->vc_par[0]++;
1833 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1834 return;
1835 case 'B': case 'e':
1836 if (!vc->vc_par[0])
1837 vc->vc_par[0]++;
1838 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1839 return;
1840 case 'C': case 'a':
1841 if (!vc->vc_par[0])
1842 vc->vc_par[0]++;
1843 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1844 return;
1845 case 'D':
1846 if (!vc->vc_par[0])
1847 vc->vc_par[0]++;
1848 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1849 return;
1850 case 'E':
1851 if (!vc->vc_par[0])
1852 vc->vc_par[0]++;
1853 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1854 return;
1855 case 'F':
1856 if (!vc->vc_par[0])
1857 vc->vc_par[0]++;
1858 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1859 return;
1860 case 'd':
1861 if (vc->vc_par[0])
1862 vc->vc_par[0]--;
1863 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1864 return;
1865 case 'H': case 'f':
1866 if (vc->vc_par[0])
1867 vc->vc_par[0]--;
1868 if (vc->vc_par[1])
1869 vc->vc_par[1]--;
1870 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1871 return;
1872 case 'J':
1873 csi_J(vc, vc->vc_par[0]);
1874 return;
1875 case 'K':
1876 csi_K(vc, vc->vc_par[0]);
1877 return;
1878 case 'L':
1879 csi_L(vc, vc->vc_par[0]);
1880 return;
1881 case 'M':
1882 csi_M(vc, vc->vc_par[0]);
1883 return;
1884 case 'P':
1885 csi_P(vc, vc->vc_par[0]);
1886 return;
1887 case 'c':
1888 if (!vc->vc_par[0])
1889 respond_ID(tty);
1890 return;
1891 case 'g':
1892 if (!vc->vc_par[0])
1893 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1894 else if (vc->vc_par[0] == 3) {
1895 vc->vc_tab_stop[0] =
1896 vc->vc_tab_stop[1] =
1897 vc->vc_tab_stop[2] =
1898 vc->vc_tab_stop[3] =
1899 vc->vc_tab_stop[4] = 0;
1900 }
1901 return;
1902 case 'm':
1903 csi_m(vc);
1904 return;
1905 case 'q': /* DECLL - but only 3 leds */
1906 /* map 0,1,2,3 to 0,1,2,4 */
1907 if (vc->vc_par[0] < 4)
1908 setledstate(kbd_table + vc->vc_num,
1909 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1910 return;
1911 case 'r':
1912 if (!vc->vc_par[0])
1913 vc->vc_par[0]++;
1914 if (!vc->vc_par[1])
1915 vc->vc_par[1] = vc->vc_rows;
1916 /* Minimum allowed region is 2 lines */
1917 if (vc->vc_par[0] < vc->vc_par[1] &&
1918 vc->vc_par[1] <= vc->vc_rows) {
1919 vc->vc_top = vc->vc_par[0] - 1;
1920 vc->vc_bottom = vc->vc_par[1];
1921 gotoxay(vc, 0, 0);
1922 }
1923 return;
1924 case 's':
1925 save_cur(vc);
1926 return;
1927 case 'u':
1928 restore_cur(vc);
1929 return;
1930 case 'X':
1931 csi_X(vc, vc->vc_par[0]);
1932 return;
1933 case '@':
1934 csi_at(vc, vc->vc_par[0]);
1935 return;
1936 case ']': /* setterm functions */
1937 setterm_command(vc);
1938 return;
1939 }
1940 return;
1941 case ESpercent:
1942 vc->vc_state = ESnormal;
1943 switch (c) {
1944 case '@': /* defined in ISO 2022 */
1945 vc->vc_utf = 0;
1946 return;
1947 case 'G': /* prelim official escape code */
1948 case '8': /* retained for compatibility */
1949 vc->vc_utf = 1;
1950 return;
1951 }
1952 return;
1953 case ESfunckey:
1954 vc->vc_state = ESnormal;
1955 return;
1956 case EShash:
1957 vc->vc_state = ESnormal;
1958 if (c == '8') {
1959 /* DEC screen alignment test. kludge :-) */
1960 vc->vc_video_erase_char =
1961 (vc->vc_video_erase_char & 0xff00) | 'E';
1962 csi_J(vc, 2);
1963 vc->vc_video_erase_char =
1964 (vc->vc_video_erase_char & 0xff00) | ' ';
1965 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1966 }
1967 return;
1968 case ESsetG0:
1969 if (c == '0')
1970 vc->vc_G0_charset = GRAF_MAP;
1971 else if (c == 'B')
1972 vc->vc_G0_charset = LAT1_MAP;
1973 else if (c == 'U')
1974 vc->vc_G0_charset = IBMPC_MAP;
1975 else if (c == 'K')
1976 vc->vc_G0_charset = USER_MAP;
1977 if (vc->vc_charset == 0)
1978 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1979 vc->vc_state = ESnormal;
1980 return;
1981 case ESsetG1:
1982 if (c == '0')
1983 vc->vc_G1_charset = GRAF_MAP;
1984 else if (c == 'B')
1985 vc->vc_G1_charset = LAT1_MAP;
1986 else if (c == 'U')
1987 vc->vc_G1_charset = IBMPC_MAP;
1988 else if (c == 'K')
1989 vc->vc_G1_charset = USER_MAP;
1990 if (vc->vc_charset == 1)
1991 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1992 vc->vc_state = ESnormal;
1993 return;
1994 default:
1995 vc->vc_state = ESnormal;
1996 }
1997 }
1998
1999 /* This is a temporary buffer used to prepare a tty console write
2000 * so that we can easily avoid touching user space while holding the
2001 * console spinlock. It is allocated in con_init and is shared by
2002 * this code and the vc_screen read/write tty calls.
2003 *
2004 * We have to allocate this statically in the kernel data section
2005 * since console_init (and thus con_init) are called before any
2006 * kernel memory allocation is available.
2007 */
2008 char con_buf[CON_BUF_SIZE];
2009 DEFINE_MUTEX(con_buf_mtx);
2010
2011 /* is_double_width() is based on the wcwidth() implementation by
2012 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2013 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2014 */
2015 struct interval {
2016 uint32_t first;
2017 uint32_t last;
2018 };
2019
2020 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2021 {
2022 int min = 0;
2023 int mid;
2024
2025 if (ucs < table[0].first || ucs > table[max].last)
2026 return 0;
2027 while (max >= min) {
2028 mid = (min + max) / 2;
2029 if (ucs > table[mid].last)
2030 min = mid + 1;
2031 else if (ucs < table[mid].first)
2032 max = mid - 1;
2033 else
2034 return 1;
2035 }
2036 return 0;
2037 }
2038
2039 static int is_double_width(uint32_t ucs)
2040 {
2041 static const struct interval double_width[] = {
2042 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2043 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2044 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2045 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2046 };
2047 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2048 }
2049
2050 /* acquires console_sem */
2051 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2052 {
2053 #ifdef VT_BUF_VRAM_ONLY
2054 #define FLUSH do { } while(0);
2055 #else
2056 #define FLUSH if (draw_x >= 0) { \
2057 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2058 draw_x = -1; \
2059 }
2060 #endif
2061
2062 int c, tc, ok, n = 0, draw_x = -1;
2063 unsigned int currcons;
2064 unsigned long draw_from = 0, draw_to = 0;
2065 struct vc_data *vc;
2066 unsigned char vc_attr;
2067 struct vt_notifier_param param;
2068 uint8_t rescan;
2069 uint8_t inverse;
2070 uint8_t width;
2071 u16 himask, charmask;
2072 const unsigned char *orig_buf = NULL;
2073 int orig_count;
2074
2075 if (in_interrupt())
2076 return count;
2077
2078 might_sleep();
2079
2080 acquire_console_sem();
2081 vc = tty->driver_data;
2082 if (vc == NULL) {
2083 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2084 release_console_sem();
2085 return 0;
2086 }
2087
2088 currcons = vc->vc_num;
2089 if (!vc_cons_allocated(currcons)) {
2090 /* could this happen? */
2091 static int error = 0;
2092 if (!error) {
2093 error = 1;
2094 printk("con_write: tty %d not allocated\n", currcons+1);
2095 }
2096 release_console_sem();
2097 return 0;
2098 }
2099 release_console_sem();
2100
2101 orig_buf = buf;
2102 orig_count = count;
2103
2104 /* At this point 'buf' is guaranteed to be a kernel buffer
2105 * and therefore no access to userspace (and therefore sleeping)
2106 * will be needed. The con_buf_mtx serializes all tty based
2107 * console rendering and vcs write/read operations. We hold
2108 * the console spinlock during the entire write.
2109 */
2110
2111 acquire_console_sem();
2112
2113 vc = tty->driver_data;
2114 if (vc == NULL) {
2115 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2116 release_console_sem();
2117 goto out;
2118 }
2119
2120 himask = vc->vc_hi_font_mask;
2121 charmask = himask ? 0x1ff : 0xff;
2122
2123 /* undraw cursor first */
2124 if (IS_FG(vc))
2125 hide_cursor(vc);
2126
2127 param.vc = vc;
2128
2129 while (!tty->stopped && count) {
2130 int orig = *buf;
2131 c = orig;
2132 buf++;
2133 n++;
2134 count--;
2135 rescan = 0;
2136 inverse = 0;
2137 width = 1;
2138
2139 /* Do no translation at all in control states */
2140 if (vc->vc_state != ESnormal) {
2141 tc = c;
2142 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2143 /* Combine UTF-8 into Unicode in vc_utf_char.
2144 * vc_utf_count is the number of continuation bytes still
2145 * expected to arrive.
2146 * vc_npar is the number of continuation bytes arrived so
2147 * far
2148 */
2149 rescan_last_byte:
2150 if ((c & 0xc0) == 0x80) {
2151 /* Continuation byte received */
2152 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2153 if (vc->vc_utf_count) {
2154 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2155 vc->vc_npar++;
2156 if (--vc->vc_utf_count) {
2157 /* Still need some bytes */
2158 continue;
2159 }
2160 /* Got a whole character */
2161 c = vc->vc_utf_char;
2162 /* Reject overlong sequences */
2163 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2164 c > utf8_length_changes[vc->vc_npar])
2165 c = 0xfffd;
2166 } else {
2167 /* Unexpected continuation byte */
2168 vc->vc_utf_count = 0;
2169 c = 0xfffd;
2170 }
2171 } else {
2172 /* Single ASCII byte or first byte of a sequence received */
2173 if (vc->vc_utf_count) {
2174 /* Continuation byte expected */
2175 rescan = 1;
2176 vc->vc_utf_count = 0;
2177 c = 0xfffd;
2178 } else if (c > 0x7f) {
2179 /* First byte of a multibyte sequence received */
2180 vc->vc_npar = 0;
2181 if ((c & 0xe0) == 0xc0) {
2182 vc->vc_utf_count = 1;
2183 vc->vc_utf_char = (c & 0x1f);
2184 } else if ((c & 0xf0) == 0xe0) {
2185 vc->vc_utf_count = 2;
2186 vc->vc_utf_char = (c & 0x0f);
2187 } else if ((c & 0xf8) == 0xf0) {
2188 vc->vc_utf_count = 3;
2189 vc->vc_utf_char = (c & 0x07);
2190 } else if ((c & 0xfc) == 0xf8) {
2191 vc->vc_utf_count = 4;
2192 vc->vc_utf_char = (c & 0x03);
2193 } else if ((c & 0xfe) == 0xfc) {
2194 vc->vc_utf_count = 5;
2195 vc->vc_utf_char = (c & 0x01);
2196 } else {
2197 /* 254 and 255 are invalid */
2198 c = 0xfffd;
2199 }
2200 if (vc->vc_utf_count) {
2201 /* Still need some bytes */
2202 continue;
2203 }
2204 }
2205 /* Nothing to do if an ASCII byte was received */
2206 }
2207 /* End of UTF-8 decoding. */
2208 /* c is the received character, or U+FFFD for invalid sequences. */
2209 /* Replace invalid Unicode code points with U+FFFD too */
2210 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2211 c = 0xfffd;
2212 tc = c;
2213 } else { /* no utf or alternate charset mode */
2214 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2215 }
2216
2217 param.c = tc;
2218 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2219 &param) == NOTIFY_STOP)
2220 continue;
2221
2222 /* If the original code was a control character we
2223 * only allow a glyph to be displayed if the code is
2224 * not normally used (such as for cursor movement) or
2225 * if the disp_ctrl mode has been explicitly enabled.
2226 * Certain characters (as given by the CTRL_ALWAYS
2227 * bitmap) are always displayed as control characters,
2228 * as the console would be pretty useless without
2229 * them; to display an arbitrary font position use the
2230 * direct-to-font zone in UTF-8 mode.
2231 */
2232 ok = tc && (c >= 32 ||
2233 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2234 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2235 && (c != 127 || vc->vc_disp_ctrl)
2236 && (c != 128+27);
2237
2238 if (vc->vc_state == ESnormal && ok) {
2239 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2240 if (is_double_width(c))
2241 width = 2;
2242 }
2243 /* Now try to find out how to display it */
2244 tc = conv_uni_to_pc(vc, tc);
2245 if (tc & ~charmask) {
2246 if (tc == -1 || tc == -2) {
2247 continue; /* nothing to display */
2248 }
2249 /* Glyph not found */
2250 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2251 /* In legacy mode use the glyph we get by a 1:1 mapping.
2252 This would make absolutely no sense with Unicode in mind,
2253 but do this for ASCII characters since a font may lack
2254 Unicode mapping info and we don't want to end up with
2255 having question marks only. */
2256 tc = c;
2257 } else {
2258 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2259 tc = conv_uni_to_pc(vc, 0xfffd);
2260 if (tc < 0) {
2261 inverse = 1;
2262 tc = conv_uni_to_pc(vc, '?');
2263 if (tc < 0) tc = '?';
2264 }
2265 }
2266 }
2267
2268 if (!inverse) {
2269 vc_attr = vc->vc_attr;
2270 } else {
2271 /* invert vc_attr */
2272 if (!vc->vc_can_do_color) {
2273 vc_attr = (vc->vc_attr) ^ 0x08;
2274 } else if (vc->vc_hi_font_mask == 0x100) {
2275 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2276 } else {
2277 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2278 }
2279 FLUSH
2280 }
2281
2282 while (1) {
2283 if (vc->vc_need_wrap || vc->vc_decim)
2284 FLUSH
2285 if (vc->vc_need_wrap) {
2286 cr(vc);
2287 lf(vc);
2288 }
2289 if (vc->vc_decim)
2290 insert_char(vc, 1);
2291 scr_writew(himask ?
2292 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2293 (vc_attr << 8) + tc,
2294 (u16 *) vc->vc_pos);
2295 if (DO_UPDATE(vc) && draw_x < 0) {
2296 draw_x = vc->vc_x;
2297 draw_from = vc->vc_pos;
2298 }
2299 if (vc->vc_x == vc->vc_cols - 1) {
2300 vc->vc_need_wrap = vc->vc_decawm;
2301 draw_to = vc->vc_pos + 2;
2302 } else {
2303 vc->vc_x++;
2304 draw_to = (vc->vc_pos += 2);
2305 }
2306
2307 if (!--width) break;
2308
2309 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2310 if (tc < 0) tc = ' ';
2311 }
2312 notify_write(vc, c);
2313
2314 if (inverse) {
2315 FLUSH
2316 }
2317
2318 if (rescan) {
2319 rescan = 0;
2320 inverse = 0;
2321 width = 1;
2322 c = orig;
2323 goto rescan_last_byte;
2324 }
2325 continue;
2326 }
2327 FLUSH
2328 do_con_trol(tty, vc, orig);
2329 }
2330 FLUSH
2331 console_conditional_schedule();
2332 release_console_sem();
2333
2334 out:
2335 notify_update(vc);
2336 return n;
2337 #undef FLUSH
2338 }
2339
2340 /*
2341 * This is the console switching callback.
2342 *
2343 * Doing console switching in a process context allows
2344 * us to do the switches asynchronously (needed when we want
2345 * to switch due to a keyboard interrupt). Synchronization
2346 * with other console code and prevention of re-entrancy is
2347 * ensured with console_sem.
2348 */
2349 static void console_callback(struct work_struct *ignored)
2350 {
2351 acquire_console_sem();
2352
2353 if (want_console >= 0) {
2354 if (want_console != fg_console &&
2355 vc_cons_allocated(want_console)) {
2356 hide_cursor(vc_cons[fg_console].d);
2357 change_console(vc_cons[want_console].d);
2358 /* we only changed when the console had already
2359 been allocated - a new console is not created
2360 in an interrupt routine */
2361 }
2362 want_console = -1;
2363 }
2364 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2365 do_poke_blanked_console = 0;
2366 poke_blanked_console();
2367 }
2368 if (scrollback_delta) {
2369 struct vc_data *vc = vc_cons[fg_console].d;
2370 clear_selection();
2371 if (vc->vc_mode == KD_TEXT)
2372 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2373 scrollback_delta = 0;
2374 }
2375 if (blank_timer_expired) {
2376 do_blank_screen(0);
2377 blank_timer_expired = 0;
2378 }
2379 notify_update(vc_cons[fg_console].d);
2380
2381 release_console_sem();
2382 }
2383
2384 int set_console(int nr)
2385 {
2386 struct vc_data *vc = vc_cons[fg_console].d;
2387
2388 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2389 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2390
2391 /*
2392 * Console switch will fail in console_callback() or
2393 * change_console() so there is no point scheduling
2394 * the callback
2395 *
2396 * Existing set_console() users don't check the return
2397 * value so this shouldn't break anything
2398 */
2399 return -EINVAL;
2400 }
2401
2402 want_console = nr;
2403 schedule_console_callback();
2404
2405 return 0;
2406 }
2407
2408 struct tty_driver *console_driver;
2409
2410 #ifdef CONFIG_VT_CONSOLE
2411
2412 /*
2413 * Console on virtual terminal
2414 *
2415 * The console must be locked when we get here.
2416 */
2417
2418 static void vt_console_print(struct console *co, const char *b, unsigned count)
2419 {
2420 struct vc_data *vc = vc_cons[fg_console].d;
2421 unsigned char c;
2422 static DEFINE_SPINLOCK(printing_lock);
2423 const ushort *start;
2424 ushort cnt = 0;
2425 ushort myx;
2426
2427 /* console busy or not yet initialized */
2428 if (!printable)
2429 return;
2430 if (!spin_trylock(&printing_lock))
2431 return;
2432
2433 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2434 vc = vc_cons[kmsg_redirect - 1].d;
2435
2436 /* read `x' only after setting currcons properly (otherwise
2437 the `x' macro will read the x of the foreground console). */
2438 myx = vc->vc_x;
2439
2440 if (!vc_cons_allocated(fg_console)) {
2441 /* impossible */
2442 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2443 goto quit;
2444 }
2445
2446 if (vc->vc_mode != KD_TEXT)
2447 goto quit;
2448
2449 /* undraw cursor first */
2450 if (IS_FG(vc))
2451 hide_cursor(vc);
2452
2453 start = (ushort *)vc->vc_pos;
2454
2455 /* Contrived structure to try to emulate original need_wrap behaviour
2456 * Problems caused when we have need_wrap set on '\n' character */
2457 while (count--) {
2458 c = *b++;
2459 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2460 if (cnt > 0) {
2461 if (CON_IS_VISIBLE(vc))
2462 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2463 vc->vc_x += cnt;
2464 if (vc->vc_need_wrap)
2465 vc->vc_x--;
2466 cnt = 0;
2467 }
2468 if (c == 8) { /* backspace */
2469 bs(vc);
2470 start = (ushort *)vc->vc_pos;
2471 myx = vc->vc_x;
2472 continue;
2473 }
2474 if (c != 13)
2475 lf(vc);
2476 cr(vc);
2477 start = (ushort *)vc->vc_pos;
2478 myx = vc->vc_x;
2479 if (c == 10 || c == 13)
2480 continue;
2481 }
2482 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2483 notify_write(vc, c);
2484 cnt++;
2485 if (myx == vc->vc_cols - 1) {
2486 vc->vc_need_wrap = 1;
2487 continue;
2488 }
2489 vc->vc_pos += 2;
2490 myx++;
2491 }
2492 if (cnt > 0) {
2493 if (CON_IS_VISIBLE(vc))
2494 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2495 vc->vc_x += cnt;
2496 if (vc->vc_x == vc->vc_cols) {
2497 vc->vc_x--;
2498 vc->vc_need_wrap = 1;
2499 }
2500 }
2501 set_cursor(vc);
2502 notify_update(vc);
2503
2504 quit:
2505 spin_unlock(&printing_lock);
2506 }
2507
2508 static struct tty_driver *vt_console_device(struct console *c, int *index)
2509 {
2510 *index = c->index ? c->index-1 : fg_console;
2511 return console_driver;
2512 }
2513
2514 static struct console vt_console_driver = {
2515 .name = "tty",
2516 .write = vt_console_print,
2517 .device = vt_console_device,
2518 .unblank = unblank_screen,
2519 .flags = CON_PRINTBUFFER,
2520 .index = -1,
2521 };
2522 #endif
2523
2524 /*
2525 * Handling of Linux-specific VC ioctls
2526 */
2527
2528 /*
2529 * Generally a bit racy with respect to console_sem().
2530 *
2531 * There are some functions which don't need it.
2532 *
2533 * There are some functions which can sleep for arbitrary periods
2534 * (paste_selection) but we don't need the lock there anyway.
2535 *
2536 * set_selection has locking, and definitely needs it
2537 */
2538
2539 int tioclinux(struct tty_struct *tty, unsigned long arg)
2540 {
2541 char type, data;
2542 char __user *p = (char __user *)arg;
2543 int lines;
2544 int ret;
2545
2546 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2547 return -EINVAL;
2548 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2549 return -EPERM;
2550 if (get_user(type, p))
2551 return -EFAULT;
2552 ret = 0;
2553
2554 lock_kernel();
2555
2556 switch (type)
2557 {
2558 case TIOCL_SETSEL:
2559 acquire_console_sem();
2560 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2561 release_console_sem();
2562 break;
2563 case TIOCL_PASTESEL:
2564 ret = paste_selection(tty);
2565 break;
2566 case TIOCL_UNBLANKSCREEN:
2567 acquire_console_sem();
2568 unblank_screen();
2569 release_console_sem();
2570 break;
2571 case TIOCL_SELLOADLUT:
2572 ret = sel_loadlut(p);
2573 break;
2574 case TIOCL_GETSHIFTSTATE:
2575
2576 /*
2577 * Make it possible to react to Shift+Mousebutton.
2578 * Note that 'shift_state' is an undocumented
2579 * kernel-internal variable; programs not closely
2580 * related to the kernel should not use this.
2581 */
2582 data = shift_state;
2583 ret = __put_user(data, p);
2584 break;
2585 case TIOCL_GETMOUSEREPORTING:
2586 data = mouse_reporting();
2587 ret = __put_user(data, p);
2588 break;
2589 case TIOCL_SETVESABLANK:
2590 ret = set_vesa_blanking(p);
2591 break;
2592 case TIOCL_GETKMSGREDIRECT:
2593 data = kmsg_redirect;
2594 ret = __put_user(data, p);
2595 break;
2596 case TIOCL_SETKMSGREDIRECT:
2597 if (!capable(CAP_SYS_ADMIN)) {
2598 ret = -EPERM;
2599 } else {
2600 if (get_user(data, p+1))
2601 ret = -EFAULT;
2602 else
2603 kmsg_redirect = data;
2604 }
2605 break;
2606 case TIOCL_GETFGCONSOLE:
2607 ret = fg_console;
2608 break;
2609 case TIOCL_SCROLLCONSOLE:
2610 if (get_user(lines, (s32 __user *)(p+4))) {
2611 ret = -EFAULT;
2612 } else {
2613 scrollfront(vc_cons[fg_console].d, lines);
2614 ret = 0;
2615 }
2616 break;
2617 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2618 acquire_console_sem();
2619 ignore_poke = 1;
2620 do_blank_screen(0);
2621 release_console_sem();
2622 break;
2623 case TIOCL_BLANKEDSCREEN:
2624 ret = console_blanked;
2625 break;
2626 default:
2627 ret = -EINVAL;
2628 break;
2629 }
2630 unlock_kernel();
2631 return ret;
2632 }
2633
2634 /*
2635 * /dev/ttyN handling
2636 */
2637
2638 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2639 {
2640 int retval;
2641
2642 retval = do_con_write(tty, buf, count);
2643 con_flush_chars(tty);
2644
2645 return retval;
2646 }
2647
2648 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2649 {
2650 if (in_interrupt())
2651 return 0; /* n_r3964 calls put_char() from interrupt context */
2652 return do_con_write(tty, &ch, 1);
2653 }
2654
2655 static int con_write_room(struct tty_struct *tty)
2656 {
2657 if (tty->stopped)
2658 return 0;
2659 return 4096; /* No limit, really; we're not buffering */
2660 }
2661
2662 static int con_chars_in_buffer(struct tty_struct *tty)
2663 {
2664 return 0; /* we're not buffering */
2665 }
2666
2667 /*
2668 * con_throttle and con_unthrottle are only used for
2669 * paste_selection(), which has to stuff in a large number of
2670 * characters...
2671 */
2672 static void con_throttle(struct tty_struct *tty)
2673 {
2674 }
2675
2676 static void con_unthrottle(struct tty_struct *tty)
2677 {
2678 struct vc_data *vc = tty->driver_data;
2679
2680 wake_up_interruptible(&vc->paste_wait);
2681 }
2682
2683 /*
2684 * Turn the Scroll-Lock LED on when the tty is stopped
2685 */
2686 static void con_stop(struct tty_struct *tty)
2687 {
2688 int console_num;
2689 if (!tty)
2690 return;
2691 console_num = tty->index;
2692 if (!vc_cons_allocated(console_num))
2693 return;
2694 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2695 set_leds();
2696 }
2697
2698 /*
2699 * Turn the Scroll-Lock LED off when the console is started
2700 */
2701 static void con_start(struct tty_struct *tty)
2702 {
2703 int console_num;
2704 if (!tty)
2705 return;
2706 console_num = tty->index;
2707 if (!vc_cons_allocated(console_num))
2708 return;
2709 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2710 set_leds();
2711 }
2712
2713 static void con_flush_chars(struct tty_struct *tty)
2714 {
2715 struct vc_data *vc;
2716
2717 if (in_interrupt()) /* from flush_to_ldisc */
2718 return;
2719
2720 /* if we race with con_close(), vt may be null */
2721 acquire_console_sem();
2722 vc = tty->driver_data;
2723 if (vc)
2724 set_cursor(vc);
2725 release_console_sem();
2726 }
2727
2728 /*
2729 * Allocate the console screen memory.
2730 */
2731 static int con_open(struct tty_struct *tty, struct file *filp)
2732 {
2733 unsigned int currcons = tty->index;
2734 int ret = 0;
2735
2736 acquire_console_sem();
2737 if (tty->driver_data == NULL) {
2738 ret = vc_allocate(currcons);
2739 if (ret == 0) {
2740 struct vc_data *vc = vc_cons[currcons].d;
2741 tty->driver_data = vc;
2742 vc->vc_tty = tty;
2743
2744 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2745 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2746 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2747 }
2748 if (vc->vc_utf)
2749 tty->termios->c_iflag |= IUTF8;
2750 else
2751 tty->termios->c_iflag &= ~IUTF8;
2752 vcs_make_sysfs(tty);
2753 release_console_sem();
2754 return ret;
2755 }
2756 }
2757 release_console_sem();
2758 return ret;
2759 }
2760
2761 /*
2762 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2763 * and taking a ref against the tty while we're in the process of forgetting
2764 * about it and cleaning things up.
2765 *
2766 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2767 */
2768 static void con_close(struct tty_struct *tty, struct file *filp)
2769 {
2770 mutex_lock(&tty_mutex);
2771 acquire_console_sem();
2772 if (tty && tty->count == 1) {
2773 struct vc_data *vc = tty->driver_data;
2774
2775 if (vc)
2776 vc->vc_tty = NULL;
2777 tty->driver_data = NULL;
2778 vcs_remove_sysfs(tty);
2779 release_console_sem();
2780 mutex_unlock(&tty_mutex);
2781 /*
2782 * tty_mutex is released, but we still hold BKL, so there is
2783 * still exclusion against init_dev()
2784 */
2785 return;
2786 }
2787 release_console_sem();
2788 mutex_unlock(&tty_mutex);
2789 }
2790
2791 static int default_italic_color = 2; // green (ASCII)
2792 static int default_underline_color = 3; // cyan (ASCII)
2793 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2794 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2795
2796 static void vc_init(struct vc_data *vc, unsigned int rows,
2797 unsigned int cols, int do_clear)
2798 {
2799 int j, k ;
2800
2801 vc->vc_cols = cols;
2802 vc->vc_rows = rows;
2803 vc->vc_size_row = cols << 1;
2804 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2805
2806 set_origin(vc);
2807 vc->vc_pos = vc->vc_origin;
2808 reset_vc(vc);
2809 for (j=k=0; j<16; j++) {
2810 vc->vc_palette[k++] = default_red[j] ;
2811 vc->vc_palette[k++] = default_grn[j] ;
2812 vc->vc_palette[k++] = default_blu[j] ;
2813 }
2814 vc->vc_def_color = 0x07; /* white */
2815 vc->vc_ulcolor = default_underline_color;
2816 vc->vc_itcolor = default_italic_color;
2817 vc->vc_halfcolor = 0x08; /* grey */
2818 init_waitqueue_head(&vc->paste_wait);
2819 reset_terminal(vc, do_clear);
2820 }
2821
2822 /*
2823 * This routine initializes console interrupts, and does nothing
2824 * else. If you want the screen to clear, call tty_write with
2825 * the appropriate escape-sequence.
2826 */
2827
2828 static int __init con_init(void)
2829 {
2830 const char *display_desc = NULL;
2831 struct vc_data *vc;
2832 unsigned int currcons = 0, i;
2833
2834 acquire_console_sem();
2835
2836 if (conswitchp)
2837 display_desc = conswitchp->con_startup();
2838 if (!display_desc) {
2839 fg_console = 0;
2840 release_console_sem();
2841 return 0;
2842 }
2843
2844 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2845 struct con_driver *con_driver = &registered_con_driver[i];
2846
2847 if (con_driver->con == NULL) {
2848 con_driver->con = conswitchp;
2849 con_driver->desc = display_desc;
2850 con_driver->flag = CON_DRIVER_FLAG_INIT;
2851 con_driver->first = 0;
2852 con_driver->last = MAX_NR_CONSOLES - 1;
2853 break;
2854 }
2855 }
2856
2857 for (i = 0; i < MAX_NR_CONSOLES; i++)
2858 con_driver_map[i] = conswitchp;
2859
2860 if (blankinterval) {
2861 blank_state = blank_normal_wait;
2862 mod_timer(&console_timer, jiffies + blankinterval);
2863 }
2864
2865 /*
2866 * kmalloc is not running yet - we use the bootmem allocator.
2867 */
2868 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2869 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2870 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2871 visual_init(vc, currcons, 1);
2872 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2873 vc->vc_kmalloced = 0;
2874 vc_init(vc, vc->vc_rows, vc->vc_cols,
2875 currcons || !vc->vc_sw->con_save_screen);
2876 }
2877 currcons = fg_console = 0;
2878 master_display_fg = vc = vc_cons[currcons].d;
2879 set_origin(vc);
2880 save_screen(vc);
2881 gotoxy(vc, vc->vc_x, vc->vc_y);
2882 csi_J(vc, 0);
2883 update_screen(vc);
2884 printk("Console: %s %s %dx%d",
2885 vc->vc_can_do_color ? "colour" : "mono",
2886 display_desc, vc->vc_cols, vc->vc_rows);
2887 printable = 1;
2888 printk("\n");
2889
2890 release_console_sem();
2891
2892 #ifdef CONFIG_VT_CONSOLE
2893 register_console(&vt_console_driver);
2894 #endif
2895 return 0;
2896 }
2897 console_initcall(con_init);
2898
2899 static const struct tty_operations con_ops = {
2900 .open = con_open,
2901 .close = con_close,
2902 .write = con_write,
2903 .write_room = con_write_room,
2904 .put_char = con_put_char,
2905 .flush_chars = con_flush_chars,
2906 .chars_in_buffer = con_chars_in_buffer,
2907 .ioctl = vt_ioctl,
2908 .stop = con_stop,
2909 .start = con_start,
2910 .throttle = con_throttle,
2911 .unthrottle = con_unthrottle,
2912 };
2913
2914 int __init vty_init(void)
2915 {
2916 vcs_init();
2917
2918 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2919 if (!console_driver)
2920 panic("Couldn't allocate console driver\n");
2921 console_driver->owner = THIS_MODULE;
2922 console_driver->name = "tty";
2923 console_driver->name_base = 1;
2924 console_driver->major = TTY_MAJOR;
2925 console_driver->minor_start = 1;
2926 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2927 console_driver->init_termios = tty_std_termios;
2928 if (default_utf8)
2929 console_driver->init_termios.c_iflag |= IUTF8;
2930 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2931 tty_set_operations(console_driver, &con_ops);
2932 if (tty_register_driver(console_driver))
2933 panic("Couldn't register console driver\n");
2934
2935 kbd_init();
2936 console_map_init();
2937 #ifdef CONFIG_PROM_CONSOLE
2938 prom_con_init();
2939 #endif
2940 #ifdef CONFIG_MDA_CONSOLE
2941 mda_console_init();
2942 #endif
2943 return 0;
2944 }
2945
2946 #ifndef VT_SINGLE_DRIVER
2947 #include <linux/device.h>
2948
2949 static struct class *vtconsole_class;
2950
2951 static int bind_con_driver(const struct consw *csw, int first, int last,
2952 int deflt)
2953 {
2954 struct module *owner = csw->owner;
2955 const char *desc = NULL;
2956 struct con_driver *con_driver;
2957 int i, j = -1, k = -1, retval = -ENODEV;
2958
2959 if (!try_module_get(owner))
2960 return -ENODEV;
2961
2962 acquire_console_sem();
2963
2964 /* check if driver is registered */
2965 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2966 con_driver = &registered_con_driver[i];
2967
2968 if (con_driver->con == csw) {
2969 desc = con_driver->desc;
2970 retval = 0;
2971 break;
2972 }
2973 }
2974
2975 if (retval)
2976 goto err;
2977
2978 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2979 csw->con_startup();
2980 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2981 }
2982
2983 if (deflt) {
2984 if (conswitchp)
2985 module_put(conswitchp->owner);
2986
2987 __module_get(owner);
2988 conswitchp = csw;
2989 }
2990
2991 first = max(first, con_driver->first);
2992 last = min(last, con_driver->last);
2993
2994 for (i = first; i <= last; i++) {
2995 int old_was_color;
2996 struct vc_data *vc = vc_cons[i].d;
2997
2998 if (con_driver_map[i])
2999 module_put(con_driver_map[i]->owner);
3000 __module_get(owner);
3001 con_driver_map[i] = csw;
3002
3003 if (!vc || !vc->vc_sw)
3004 continue;
3005
3006 j = i;
3007
3008 if (CON_IS_VISIBLE(vc)) {
3009 k = i;
3010 save_screen(vc);
3011 }
3012
3013 old_was_color = vc->vc_can_do_color;
3014 vc->vc_sw->con_deinit(vc);
3015 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3016 visual_init(vc, i, 0);
3017 set_origin(vc);
3018 update_attr(vc);
3019
3020 /* If the console changed between mono <-> color, then
3021 * the attributes in the screenbuf will be wrong. The
3022 * following resets all attributes to something sane.
3023 */
3024 if (old_was_color != vc->vc_can_do_color)
3025 clear_buffer_attributes(vc);
3026 }
3027
3028 printk("Console: switching ");
3029 if (!deflt)
3030 printk("consoles %d-%d ", first+1, last+1);
3031 if (j >= 0) {
3032 struct vc_data *vc = vc_cons[j].d;
3033
3034 printk("to %s %s %dx%d\n",
3035 vc->vc_can_do_color ? "colour" : "mono",
3036 desc, vc->vc_cols, vc->vc_rows);
3037
3038 if (k >= 0) {
3039 vc = vc_cons[k].d;
3040 update_screen(vc);
3041 }
3042 } else
3043 printk("to %s\n", desc);
3044
3045 retval = 0;
3046 err:
3047 release_console_sem();
3048 module_put(owner);
3049 return retval;
3050 };
3051
3052 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3053 static int con_is_graphics(const struct consw *csw, int first, int last)
3054 {
3055 int i, retval = 0;
3056
3057 for (i = first; i <= last; i++) {
3058 struct vc_data *vc = vc_cons[i].d;
3059
3060 if (vc && vc->vc_mode == KD_GRAPHICS) {
3061 retval = 1;
3062 break;
3063 }
3064 }
3065
3066 return retval;
3067 }
3068
3069 /**
3070 * unbind_con_driver - unbind a console driver
3071 * @csw: pointer to console driver to unregister
3072 * @first: first in range of consoles that @csw should be unbound from
3073 * @last: last in range of consoles that @csw should be unbound from
3074 * @deflt: should next bound console driver be default after @csw is unbound?
3075 *
3076 * To unbind a driver from all possible consoles, pass 0 as @first and
3077 * %MAX_NR_CONSOLES as @last.
3078 *
3079 * @deflt controls whether the console that ends up replacing @csw should be
3080 * the default console.
3081 *
3082 * RETURNS:
3083 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3084 * or 0 on success.
3085 */
3086 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3087 {
3088 struct module *owner = csw->owner;
3089 const struct consw *defcsw = NULL;
3090 struct con_driver *con_driver = NULL, *con_back = NULL;
3091 int i, retval = -ENODEV;
3092
3093 if (!try_module_get(owner))
3094 return -ENODEV;
3095
3096 acquire_console_sem();
3097
3098 /* check if driver is registered and if it is unbindable */
3099 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3100 con_driver = &registered_con_driver[i];
3101
3102 if (con_driver->con == csw &&
3103 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3104 retval = 0;
3105 break;
3106 }
3107 }
3108
3109 if (retval) {
3110 release_console_sem();
3111 goto err;
3112 }
3113
3114 retval = -ENODEV;
3115
3116 /* check if backup driver exists */
3117 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3118 con_back = &registered_con_driver[i];
3119
3120 if (con_back->con &&
3121 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3122 defcsw = con_back->con;
3123 retval = 0;
3124 break;
3125 }
3126 }
3127
3128 if (retval) {
3129 release_console_sem();
3130 goto err;
3131 }
3132
3133 if (!con_is_bound(csw)) {
3134 release_console_sem();
3135 goto err;
3136 }
3137
3138 first = max(first, con_driver->first);
3139 last = min(last, con_driver->last);
3140
3141 for (i = first; i <= last; i++) {
3142 if (con_driver_map[i] == csw) {
3143 module_put(csw->owner);
3144 con_driver_map[i] = NULL;
3145 }
3146 }
3147
3148 if (!con_is_bound(defcsw)) {
3149 const struct consw *defconsw = conswitchp;
3150
3151 defcsw->con_startup();
3152 con_back->flag |= CON_DRIVER_FLAG_INIT;
3153 /*
3154 * vgacon may change the default driver to point
3155 * to dummycon, we restore it here...
3156 */
3157 conswitchp = defconsw;
3158 }
3159
3160 if (!con_is_bound(csw))
3161 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3162
3163 release_console_sem();
3164 /* ignore return value, binding should not fail */
3165 bind_con_driver(defcsw, first, last, deflt);
3166 err:
3167 module_put(owner);
3168 return retval;
3169
3170 }
3171 EXPORT_SYMBOL(unbind_con_driver);
3172
3173 static int vt_bind(struct con_driver *con)
3174 {
3175 const struct consw *defcsw = NULL, *csw = NULL;
3176 int i, more = 1, first = -1, last = -1, deflt = 0;
3177
3178 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3179 con_is_graphics(con->con, con->first, con->last))
3180 goto err;
3181
3182 csw = con->con;
3183
3184 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3185 struct con_driver *con = &registered_con_driver[i];
3186
3187 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3188 defcsw = con->con;
3189 break;
3190 }
3191 }
3192
3193 if (!defcsw)
3194 goto err;
3195
3196 while (more) {
3197 more = 0;
3198
3199 for (i = con->first; i <= con->last; i++) {
3200 if (con_driver_map[i] == defcsw) {
3201 if (first == -1)
3202 first = i;
3203 last = i;
3204 more = 1;
3205 } else if (first != -1)
3206 break;
3207 }
3208
3209 if (first == 0 && last == MAX_NR_CONSOLES -1)
3210 deflt = 1;
3211
3212 if (first != -1)
3213 bind_con_driver(csw, first, last, deflt);
3214
3215 first = -1;
3216 last = -1;
3217 deflt = 0;
3218 }
3219
3220 err:
3221 return 0;
3222 }
3223
3224 static int vt_unbind(struct con_driver *con)
3225 {
3226 const struct consw *csw = NULL;
3227 int i, more = 1, first = -1, last = -1, deflt = 0;
3228
3229 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3230 con_is_graphics(con->con, con->first, con->last))
3231 goto err;
3232
3233 csw = con->con;
3234
3235 while (more) {
3236 more = 0;
3237
3238 for (i = con->first; i <= con->last; i++) {
3239 if (con_driver_map[i] == csw) {
3240 if (first == -1)
3241 first = i;
3242 last = i;
3243 more = 1;
3244 } else if (first != -1)
3245 break;
3246 }
3247
3248 if (first == 0 && last == MAX_NR_CONSOLES -1)
3249 deflt = 1;
3250
3251 if (first != -1)
3252 unbind_con_driver(csw, first, last, deflt);
3253
3254 first = -1;
3255 last = -1;
3256 deflt = 0;
3257 }
3258
3259 err:
3260 return 0;
3261 }
3262 #else
3263 static inline int vt_bind(struct con_driver *con)
3264 {
3265 return 0;
3266 }
3267 static inline int vt_unbind(struct con_driver *con)
3268 {
3269 return 0;
3270 }
3271 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3272
3273 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3274 const char *buf, size_t count)
3275 {
3276 struct con_driver *con = dev_get_drvdata(dev);
3277 int bind = simple_strtoul(buf, NULL, 0);
3278
3279 if (bind)
3280 vt_bind(con);
3281 else
3282 vt_unbind(con);
3283
3284 return count;
3285 }
3286
3287 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3288 char *buf)
3289 {
3290 struct con_driver *con = dev_get_drvdata(dev);
3291 int bind = con_is_bound(con->con);
3292
3293 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3294 }
3295
3296 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3297 char *buf)
3298 {
3299 struct con_driver *con = dev_get_drvdata(dev);
3300
3301 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3302 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3303 con->desc);
3304
3305 }
3306
3307 static struct device_attribute device_attrs[] = {
3308 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3309 __ATTR(name, S_IRUGO, show_name, NULL),
3310 };
3311
3312 static int vtconsole_init_device(struct con_driver *con)
3313 {
3314 int i;
3315 int error = 0;
3316
3317 con->flag |= CON_DRIVER_FLAG_ATTR;
3318 dev_set_drvdata(con->dev, con);
3319 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3320 error = device_create_file(con->dev, &device_attrs[i]);
3321 if (error)
3322 break;
3323 }
3324
3325 if (error) {
3326 while (--i >= 0)
3327 device_remove_file(con->dev, &device_attrs[i]);
3328 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3329 }
3330
3331 return error;
3332 }
3333
3334 static void vtconsole_deinit_device(struct con_driver *con)
3335 {
3336 int i;
3337
3338 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3339 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3340 device_remove_file(con->dev, &device_attrs[i]);
3341 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3342 }
3343 }
3344
3345 /**
3346 * con_is_bound - checks if driver is bound to the console
3347 * @csw: console driver
3348 *
3349 * RETURNS: zero if unbound, nonzero if bound
3350 *
3351 * Drivers can call this and if zero, they should release
3352 * all resources allocated on con_startup()
3353 */
3354 int con_is_bound(const struct consw *csw)
3355 {
3356 int i, bound = 0;
3357
3358 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3359 if (con_driver_map[i] == csw) {
3360 bound = 1;
3361 break;
3362 }
3363 }
3364
3365 return bound;
3366 }
3367 EXPORT_SYMBOL(con_is_bound);
3368
3369 /**
3370 * register_con_driver - register console driver to console layer
3371 * @csw: console driver
3372 * @first: the first console to take over, minimum value is 0
3373 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3374 *
3375 * DESCRIPTION: This function registers a console driver which can later
3376 * bind to a range of consoles specified by @first and @last. It will
3377 * also initialize the console driver by calling con_startup().
3378 */
3379 int register_con_driver(const struct consw *csw, int first, int last)
3380 {
3381 struct module *owner = csw->owner;
3382 struct con_driver *con_driver;
3383 const char *desc;
3384 int i, retval = 0;
3385
3386 if (!try_module_get(owner))
3387 return -ENODEV;
3388
3389 acquire_console_sem();
3390
3391 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3392 con_driver = &registered_con_driver[i];
3393
3394 /* already registered */
3395 if (con_driver->con == csw)
3396 retval = -EINVAL;
3397 }
3398
3399 if (retval)
3400 goto err;
3401
3402 desc = csw->con_startup();
3403
3404 if (!desc)
3405 goto err;
3406
3407 retval = -EINVAL;
3408
3409 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3410 con_driver = &registered_con_driver[i];
3411
3412 if (con_driver->con == NULL) {
3413 con_driver->con = csw;
3414 con_driver->desc = desc;
3415 con_driver->node = i;
3416 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3417 CON_DRIVER_FLAG_INIT;
3418 con_driver->first = first;
3419 con_driver->last = last;
3420 retval = 0;
3421 break;
3422 }
3423 }
3424
3425 if (retval)
3426 goto err;
3427
3428 con_driver->dev = device_create_drvdata(vtconsole_class, NULL,
3429 MKDEV(0, con_driver->node),
3430 NULL, "vtcon%i",
3431 con_driver->node);
3432
3433 if (IS_ERR(con_driver->dev)) {
3434 printk(KERN_WARNING "Unable to create device for %s; "
3435 "errno = %ld\n", con_driver->desc,
3436 PTR_ERR(con_driver->dev));
3437 con_driver->dev = NULL;
3438 } else {
3439 vtconsole_init_device(con_driver);
3440 }
3441
3442 err:
3443 release_console_sem();
3444 module_put(owner);
3445 return retval;
3446 }
3447 EXPORT_SYMBOL(register_con_driver);
3448
3449 /**
3450 * unregister_con_driver - unregister console driver from console layer
3451 * @csw: console driver
3452 *
3453 * DESCRIPTION: All drivers that registers to the console layer must
3454 * call this function upon exit, or if the console driver is in a state
3455 * where it won't be able to handle console services, such as the
3456 * framebuffer console without loaded framebuffer drivers.
3457 *
3458 * The driver must unbind first prior to unregistration.
3459 */
3460 int unregister_con_driver(const struct consw *csw)
3461 {
3462 int i, retval = -ENODEV;
3463
3464 acquire_console_sem();
3465
3466 /* cannot unregister a bound driver */
3467 if (con_is_bound(csw))
3468 goto err;
3469
3470 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3471 struct con_driver *con_driver = &registered_con_driver[i];
3472
3473 if (con_driver->con == csw &&
3474 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3475 vtconsole_deinit_device(con_driver);
3476 device_destroy(vtconsole_class,
3477 MKDEV(0, con_driver->node));
3478 con_driver->con = NULL;
3479 con_driver->desc = NULL;
3480 con_driver->dev = NULL;
3481 con_driver->node = 0;
3482 con_driver->flag = 0;
3483 con_driver->first = 0;
3484 con_driver->last = 0;
3485 retval = 0;
3486 break;
3487 }
3488 }
3489 err:
3490 release_console_sem();
3491 return retval;
3492 }
3493 EXPORT_SYMBOL(unregister_con_driver);
3494
3495 /*
3496 * If we support more console drivers, this function is used
3497 * when a driver wants to take over some existing consoles
3498 * and become default driver for newly opened ones.
3499 *
3500 * take_over_console is basically a register followed by unbind
3501 */
3502 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3503 {
3504 int err;
3505
3506 err = register_con_driver(csw, first, last);
3507
3508 if (!err)
3509 bind_con_driver(csw, first, last, deflt);
3510
3511 return err;
3512 }
3513
3514 /*
3515 * give_up_console is a wrapper to unregister_con_driver. It will only
3516 * work if driver is fully unbound.
3517 */
3518 void give_up_console(const struct consw *csw)
3519 {
3520 unregister_con_driver(csw);
3521 }
3522
3523 static int __init vtconsole_class_init(void)
3524 {
3525 int i;
3526
3527 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3528 if (IS_ERR(vtconsole_class)) {
3529 printk(KERN_WARNING "Unable to create vt console class; "
3530 "errno = %ld\n", PTR_ERR(vtconsole_class));
3531 vtconsole_class = NULL;
3532 }
3533
3534 /* Add system drivers to sysfs */
3535 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3536 struct con_driver *con = &registered_con_driver[i];
3537
3538 if (con->con && !con->dev) {
3539 con->dev = device_create_drvdata(vtconsole_class, NULL,
3540 MKDEV(0, con->node),
3541 NULL, "vtcon%i",
3542 con->node);
3543
3544 if (IS_ERR(con->dev)) {
3545 printk(KERN_WARNING "Unable to create "
3546 "device for %s; errno = %ld\n",
3547 con->desc, PTR_ERR(con->dev));
3548 con->dev = NULL;
3549 } else {
3550 vtconsole_init_device(con);
3551 }
3552 }
3553 }
3554
3555 return 0;
3556 }
3557 postcore_initcall(vtconsole_class_init);
3558
3559 #endif
3560
3561 /*
3562 * Screen blanking
3563 */
3564
3565 static int set_vesa_blanking(char __user *p)
3566 {
3567 unsigned int mode;
3568
3569 if (get_user(mode, p + 1))
3570 return -EFAULT;
3571
3572 vesa_blank_mode = (mode < 4) ? mode : 0;
3573 return 0;
3574 }
3575
3576 void do_blank_screen(int entering_gfx)
3577 {
3578 struct vc_data *vc = vc_cons[fg_console].d;
3579 int i;
3580
3581 WARN_CONSOLE_UNLOCKED();
3582
3583 if (console_blanked) {
3584 if (blank_state == blank_vesa_wait) {
3585 blank_state = blank_off;
3586 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3587 }
3588 return;
3589 }
3590
3591 /* entering graphics mode? */
3592 if (entering_gfx) {
3593 hide_cursor(vc);
3594 save_screen(vc);
3595 vc->vc_sw->con_blank(vc, -1, 1);
3596 console_blanked = fg_console + 1;
3597 blank_state = blank_off;
3598 set_origin(vc);
3599 return;
3600 }
3601
3602 if (blank_state != blank_normal_wait)
3603 return;
3604 blank_state = blank_off;
3605
3606 /* don't blank graphics */
3607 if (vc->vc_mode != KD_TEXT) {
3608 console_blanked = fg_console + 1;
3609 return;
3610 }
3611
3612 hide_cursor(vc);
3613 del_timer_sync(&console_timer);
3614 blank_timer_expired = 0;
3615
3616 save_screen(vc);
3617 /* In case we need to reset origin, blanking hook returns 1 */
3618 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3619 console_blanked = fg_console + 1;
3620 if (i)
3621 set_origin(vc);
3622
3623 if (console_blank_hook && console_blank_hook(1))
3624 return;
3625
3626 if (vesa_off_interval && vesa_blank_mode) {
3627 blank_state = blank_vesa_wait;
3628 mod_timer(&console_timer, jiffies + vesa_off_interval);
3629 }
3630 }
3631 EXPORT_SYMBOL(do_blank_screen);
3632
3633 /*
3634 * Called by timer as well as from vt_console_driver
3635 */
3636 void do_unblank_screen(int leaving_gfx)
3637 {
3638 struct vc_data *vc;
3639
3640 /* This should now always be called from a "sane" (read: can schedule)
3641 * context for the sake of the low level drivers, except in the special
3642 * case of oops_in_progress
3643 */
3644 if (!oops_in_progress)
3645 might_sleep();
3646
3647 WARN_CONSOLE_UNLOCKED();
3648
3649 ignore_poke = 0;
3650 if (!console_blanked)
3651 return;
3652 if (!vc_cons_allocated(fg_console)) {
3653 /* impossible */
3654 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3655 return;
3656 }
3657 vc = vc_cons[fg_console].d;
3658 if (vc->vc_mode != KD_TEXT)
3659 return; /* but leave console_blanked != 0 */
3660
3661 if (blankinterval) {
3662 mod_timer(&console_timer, jiffies + blankinterval);
3663 blank_state = blank_normal_wait;
3664 }
3665
3666 console_blanked = 0;
3667 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3668 /* Low-level driver cannot restore -> do it ourselves */
3669 update_screen(vc);
3670 if (console_blank_hook)
3671 console_blank_hook(0);
3672 set_palette(vc);
3673 set_cursor(vc);
3674 }
3675 EXPORT_SYMBOL(do_unblank_screen);
3676
3677 /*
3678 * This is called by the outside world to cause a forced unblank, mostly for
3679 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3680 * call it with 1 as an argument and so force a mode restore... that may kill
3681 * X or at least garbage the screen but would also make the Oops visible...
3682 */
3683 void unblank_screen(void)
3684 {
3685 do_unblank_screen(0);
3686 }
3687
3688 /*
3689 * We defer the timer blanking to work queue so it can take the console mutex
3690 * (console operations can still happen at irq time, but only from printk which
3691 * has the console mutex. Not perfect yet, but better than no locking
3692 */
3693 static void blank_screen_t(unsigned long dummy)
3694 {
3695 if (unlikely(!keventd_up())) {
3696 mod_timer(&console_timer, jiffies + blankinterval);
3697 return;
3698 }
3699 blank_timer_expired = 1;
3700 schedule_work(&console_work);
3701 }
3702
3703 void poke_blanked_console(void)
3704 {
3705 WARN_CONSOLE_UNLOCKED();
3706
3707 /* Add this so we quickly catch whoever might call us in a non
3708 * safe context. Nowadays, unblank_screen() isn't to be called in
3709 * atomic contexts and is allowed to schedule (with the special case
3710 * of oops_in_progress, but that isn't of any concern for this
3711 * function. --BenH.
3712 */
3713 might_sleep();
3714
3715 /* This isn't perfectly race free, but a race here would be mostly harmless,
3716 * at worse, we'll do a spurrious blank and it's unlikely
3717 */
3718 del_timer(&console_timer);
3719 blank_timer_expired = 0;
3720
3721 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3722 return;
3723 if (console_blanked)
3724 unblank_screen();
3725 else if (blankinterval) {
3726 mod_timer(&console_timer, jiffies + blankinterval);
3727 blank_state = blank_normal_wait;
3728 }
3729 }
3730
3731 /*
3732 * Palettes
3733 */
3734
3735 static void set_palette(struct vc_data *vc)
3736 {
3737 WARN_CONSOLE_UNLOCKED();
3738
3739 if (vc->vc_mode != KD_GRAPHICS)
3740 vc->vc_sw->con_set_palette(vc, color_table);
3741 }
3742
3743 static int set_get_cmap(unsigned char __user *arg, int set)
3744 {
3745 int i, j, k;
3746
3747 WARN_CONSOLE_UNLOCKED();
3748
3749 for (i = 0; i < 16; i++)
3750 if (set) {
3751 get_user(default_red[i], arg++);
3752 get_user(default_grn[i], arg++);
3753 get_user(default_blu[i], arg++);
3754 } else {
3755 put_user(default_red[i], arg++);
3756 put_user(default_grn[i], arg++);
3757 put_user(default_blu[i], arg++);
3758 }
3759 if (set) {
3760 for (i = 0; i < MAX_NR_CONSOLES; i++)
3761 if (vc_cons_allocated(i)) {
3762 for (j = k = 0; j < 16; j++) {
3763 vc_cons[i].d->vc_palette[k++] = default_red[j];
3764 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3765 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3766 }
3767 set_palette(vc_cons[i].d);
3768 }
3769 }
3770 return 0;
3771 }
3772
3773 /*
3774 * Load palette into the DAC registers. arg points to a colour
3775 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3776 */
3777
3778 int con_set_cmap(unsigned char __user *arg)
3779 {
3780 int rc;
3781
3782 acquire_console_sem();
3783 rc = set_get_cmap (arg,1);
3784 release_console_sem();
3785
3786 return rc;
3787 }
3788
3789 int con_get_cmap(unsigned char __user *arg)
3790 {
3791 int rc;
3792
3793 acquire_console_sem();
3794 rc = set_get_cmap (arg,0);
3795 release_console_sem();
3796
3797 return rc;
3798 }
3799
3800 void reset_palette(struct vc_data *vc)
3801 {
3802 int j, k;
3803 for (j=k=0; j<16; j++) {
3804 vc->vc_palette[k++] = default_red[j];
3805 vc->vc_palette[k++] = default_grn[j];
3806 vc->vc_palette[k++] = default_blu[j];
3807 }
3808 set_palette(vc);
3809 }
3810
3811 /*
3812 * Font switching
3813 *
3814 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3815 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3816 * depending on width) reserved for each character which is kinda wasty, but
3817 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3818 * is upto the actual low-level console-driver convert data into its favorite
3819 * format (maybe we should add a `fontoffset' field to the `display'
3820 * structure so we won't have to convert the fontdata all the time.
3821 * /Jes
3822 */
3823
3824 #define max_font_size 65536
3825
3826 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3827 {
3828 struct console_font font;
3829 int rc = -EINVAL;
3830 int c;
3831
3832 if (vc->vc_mode != KD_TEXT)
3833 return -EINVAL;
3834
3835 if (op->data) {
3836 font.data = kmalloc(max_font_size, GFP_KERNEL);
3837 if (!font.data)
3838 return -ENOMEM;
3839 } else
3840 font.data = NULL;
3841
3842 acquire_console_sem();
3843 if (vc->vc_sw->con_font_get)
3844 rc = vc->vc_sw->con_font_get(vc, &font);
3845 else
3846 rc = -ENOSYS;
3847 release_console_sem();
3848
3849 if (rc)
3850 goto out;
3851
3852 c = (font.width+7)/8 * 32 * font.charcount;
3853
3854 if (op->data && font.charcount > op->charcount)
3855 rc = -ENOSPC;
3856 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3857 if (font.width > op->width || font.height > op->height)
3858 rc = -ENOSPC;
3859 } else {
3860 if (font.width != 8)
3861 rc = -EIO;
3862 else if ((op->height && font.height > op->height) ||
3863 font.height > 32)
3864 rc = -ENOSPC;
3865 }
3866 if (rc)
3867 goto out;
3868
3869 op->height = font.height;
3870 op->width = font.width;
3871 op->charcount = font.charcount;
3872
3873 if (op->data && copy_to_user(op->data, font.data, c))
3874 rc = -EFAULT;
3875
3876 out:
3877 kfree(font.data);
3878 return rc;
3879 }
3880
3881 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3882 {
3883 struct console_font font;
3884 int rc = -EINVAL;
3885 int size;
3886
3887 if (vc->vc_mode != KD_TEXT)
3888 return -EINVAL;
3889 if (!op->data)
3890 return -EINVAL;
3891 if (op->charcount > 512)
3892 return -EINVAL;
3893 if (!op->height) { /* Need to guess font height [compat] */
3894 int h, i;
3895 u8 __user *charmap = op->data;
3896 u8 tmp;
3897
3898 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3899 so that we can get rid of this soon */
3900 if (!(op->flags & KD_FONT_FLAG_OLD))
3901 return -EINVAL;
3902 for (h = 32; h > 0; h--)
3903 for (i = 0; i < op->charcount; i++) {
3904 if (get_user(tmp, &charmap[32*i+h-1]))
3905 return -EFAULT;
3906 if (tmp)
3907 goto nonzero;
3908 }
3909 return -EINVAL;
3910 nonzero:
3911 op->height = h;
3912 }
3913 if (op->width <= 0 || op->width > 32 || op->height > 32)
3914 return -EINVAL;
3915 size = (op->width+7)/8 * 32 * op->charcount;
3916 if (size > max_font_size)
3917 return -ENOSPC;
3918 font.charcount = op->charcount;
3919 font.height = op->height;
3920 font.width = op->width;
3921 font.data = kmalloc(size, GFP_KERNEL);
3922 if (!font.data)
3923 return -ENOMEM;
3924 if (copy_from_user(font.data, op->data, size)) {
3925 kfree(font.data);
3926 return -EFAULT;
3927 }
3928 acquire_console_sem();
3929 if (vc->vc_sw->con_font_set)
3930 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3931 else
3932 rc = -ENOSYS;
3933 release_console_sem();
3934 kfree(font.data);
3935 return rc;
3936 }
3937
3938 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3939 {
3940 struct console_font font = {.width = op->width, .height = op->height};
3941 char name[MAX_FONT_NAME];
3942 char *s = name;
3943 int rc;
3944
3945 if (vc->vc_mode != KD_TEXT)
3946 return -EINVAL;
3947
3948 if (!op->data)
3949 s = NULL;
3950 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3951 return -EFAULT;
3952 else
3953 name[MAX_FONT_NAME - 1] = 0;
3954
3955 acquire_console_sem();
3956 if (vc->vc_sw->con_font_default)
3957 rc = vc->vc_sw->con_font_default(vc, &font, s);
3958 else
3959 rc = -ENOSYS;
3960 release_console_sem();
3961 if (!rc) {
3962 op->width = font.width;
3963 op->height = font.height;
3964 }
3965 return rc;
3966 }
3967
3968 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3969 {
3970 int con = op->height;
3971 int rc;
3972
3973 if (vc->vc_mode != KD_TEXT)
3974 return -EINVAL;
3975
3976 acquire_console_sem();
3977 if (!vc->vc_sw->con_font_copy)
3978 rc = -ENOSYS;
3979 else if (con < 0 || !vc_cons_allocated(con))
3980 rc = -ENOTTY;
3981 else if (con == vc->vc_num) /* nothing to do */
3982 rc = 0;
3983 else
3984 rc = vc->vc_sw->con_font_copy(vc, con);
3985 release_console_sem();
3986 return rc;
3987 }
3988
3989 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3990 {
3991 switch (op->op) {
3992 case KD_FONT_OP_SET:
3993 return con_font_set(vc, op);
3994 case KD_FONT_OP_GET:
3995 return con_font_get(vc, op);
3996 case KD_FONT_OP_SET_DEFAULT:
3997 return con_font_default(vc, op);
3998 case KD_FONT_OP_COPY:
3999 return con_font_copy(vc, op);
4000 }
4001 return -ENOSYS;
4002 }
4003
4004 /*
4005 * Interface exported to selection and vcs.
4006 */
4007
4008 /* used by selection */
4009 u16 screen_glyph(struct vc_data *vc, int offset)
4010 {
4011 u16 w = scr_readw(screenpos(vc, offset, 1));
4012 u16 c = w & 0xff;
4013
4014 if (w & vc->vc_hi_font_mask)
4015 c |= 0x100;
4016 return c;
4017 }
4018 EXPORT_SYMBOL_GPL(screen_glyph);
4019
4020 /* used by vcs - note the word offset */
4021 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4022 {
4023 return screenpos(vc, 2 * w_offset, viewed);
4024 }
4025
4026 void getconsxy(struct vc_data *vc, unsigned char *p)
4027 {
4028 p[0] = vc->vc_x;
4029 p[1] = vc->vc_y;
4030 }
4031
4032 void putconsxy(struct vc_data *vc, unsigned char *p)
4033 {
4034 hide_cursor(vc);
4035 gotoxy(vc, p[0], p[1]);
4036 set_cursor(vc);
4037 }
4038
4039 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4040 {
4041 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4042 return softcursor_original;
4043 return scr_readw(org);
4044 }
4045
4046 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4047 {
4048 scr_writew(val, org);
4049 if ((unsigned long)org == vc->vc_pos) {
4050 softcursor_original = -1;
4051 add_softcursor(vc);
4052 }
4053 }
4054
4055 /*
4056 * Visible symbols for modules
4057 */
4058
4059 EXPORT_SYMBOL(color_table);
4060 EXPORT_SYMBOL(default_red);
4061 EXPORT_SYMBOL(default_grn);
4062 EXPORT_SYMBOL(default_blu);
4063 EXPORT_SYMBOL(update_region);
4064 EXPORT_SYMBOL(redraw_screen);
4065 EXPORT_SYMBOL(vc_resize);
4066 EXPORT_SYMBOL(vc_lock_resize);
4067 EXPORT_SYMBOL(fg_console);
4068 EXPORT_SYMBOL(console_blank_hook);
4069 EXPORT_SYMBOL(console_blanked);
4070 EXPORT_SYMBOL(vc_cons);
4071 #ifndef VT_SINGLE_DRIVER
4072 EXPORT_SYMBOL(take_over_console);
4073 EXPORT_SYMBOL(give_up_console);
4074 #endif
Stable & featurefull patchset based on Linus's git branch