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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / char / vt.c
blobc2e1a8352f5118fb5b7e546c7f0f1dbd6d5f84ab
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/bootmem.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103
104 #include <asm/io.h>
105 #include <asm/system.h>
106 #include <asm/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164
165 /*
166 * ignore_poke: don't unblank the screen when things are typed. This is
167 * mainly for the privacy of braille terminal users.
168 */
169 static int ignore_poke;
170
171 int do_poke_blanked_console;
172 int console_blanked;
173
174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
175 static int blankinterval = 10*60*HZ;
176 static int vesa_off_interval;
177
178 static DECLARE_WORK(console_work, console_callback);
179
180 /*
181 * fg_console is the current virtual console,
182 * last_console is the last used one,
183 * want_console is the console we want to switch to,
184 * kmsg_redirect is the console for kernel messages,
185 */
186 int fg_console;
187 int last_console;
188 int want_console = -1;
189 int kmsg_redirect;
190
191 /*
192 * For each existing display, we have a pointer to console currently visible
193 * on that display, allowing consoles other than fg_console to be refreshed
194 * appropriately. Unless the low-level driver supplies its own display_fg
195 * variable, we use this one for the "master display".
196 */
197 static struct vc_data *master_display_fg;
198
199 /*
200 * Unfortunately, we need to delay tty echo when we're currently writing to the
201 * console since the code is (and always was) not re-entrant, so we schedule
202 * all flip requests to process context with schedule-task() and run it from
203 * console_callback().
204 */
205
206 /*
207 * For the same reason, we defer scrollback to the console callback.
208 */
209 static int scrollback_delta;
210
211 /*
212 * Hook so that the power management routines can (un)blank
213 * the console on our behalf.
214 */
215 int (*console_blank_hook)(int);
216
217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
218 static int blank_state;
219 static int blank_timer_expired;
220 enum {
221 blank_off = 0,
222 blank_normal_wait,
223 blank_vesa_wait,
224 };
225
226 /*
227 * Notifier list for console events.
228 */
229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
230
231 int register_vt_notifier(struct notifier_block *nb)
232 {
233 return atomic_notifier_chain_register(&vt_notifier_list, nb);
234 }
235 EXPORT_SYMBOL_GPL(register_vt_notifier);
236
237 int unregister_vt_notifier(struct notifier_block *nb)
238 {
239 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
240 }
241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
242
243 static void notify_write(struct vc_data *vc, unsigned int unicode)
244 {
245 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
246 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
247 }
248
249 static void notify_update(struct vc_data *vc)
250 {
251 struct vt_notifier_param param = { .vc = vc };
252 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
253 }
254
255 /*
256 * Low-Level Functions
257 */
258
259 #define IS_FG(vc) ((vc)->vc_num == fg_console)
260
261 #ifdef VT_BUF_VRAM_ONLY
262 #define DO_UPDATE(vc) 0
263 #else
264 #define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
265 #endif
266
267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
268 {
269 unsigned short *p;
270
271 if (!viewed)
272 p = (unsigned short *)(vc->vc_origin + offset);
273 else if (!vc->vc_sw->con_screen_pos)
274 p = (unsigned short *)(vc->vc_visible_origin + offset);
275 else
276 p = vc->vc_sw->con_screen_pos(vc, offset);
277 return p;
278 }
279
280 static inline void scrolldelta(int lines)
281 {
282 scrollback_delta += lines;
283 schedule_console_callback();
284 }
285
286 void schedule_console_callback(void)
287 {
288 schedule_work(&console_work);
289 }
290
291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
292 {
293 unsigned short *d, *s;
294
295 if (t+nr >= b)
296 nr = b - t - 1;
297 if (b > vc->vc_rows || t >= b || nr < 1)
298 return;
299 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
300 return;
301 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
302 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
303 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
304 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
305 vc->vc_size_row * nr);
306 }
307
308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
309 {
310 unsigned short *s;
311 unsigned int step;
312
313 if (t+nr >= b)
314 nr = b - t - 1;
315 if (b > vc->vc_rows || t >= b || nr < 1)
316 return;
317 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
318 return;
319 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
320 step = vc->vc_cols * nr;
321 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
322 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
323 }
324
325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
326 {
327 #ifndef VT_BUF_VRAM_ONLY
328 unsigned int xx, yy, offset;
329 u16 *p;
330
331 p = (u16 *) start;
332 if (!vc->vc_sw->con_getxy) {
333 offset = (start - vc->vc_origin) / 2;
334 xx = offset % vc->vc_cols;
335 yy = offset / vc->vc_cols;
336 } else {
337 int nxx, nyy;
338 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
339 xx = nxx; yy = nyy;
340 }
341 for(;;) {
342 u16 attrib = scr_readw(p) & 0xff00;
343 int startx = xx;
344 u16 *q = p;
345 while (xx < vc->vc_cols && count) {
346 if (attrib != (scr_readw(p) & 0xff00)) {
347 if (p > q)
348 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
349 startx = xx;
350 q = p;
351 attrib = scr_readw(p) & 0xff00;
352 }
353 p++;
354 xx++;
355 count--;
356 }
357 if (p > q)
358 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
359 if (!count)
360 break;
361 xx = 0;
362 yy++;
363 if (vc->vc_sw->con_getxy) {
364 p = (u16 *)start;
365 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
366 }
367 }
368 #endif
369 }
370
371 void update_region(struct vc_data *vc, unsigned long start, int count)
372 {
373 WARN_CONSOLE_UNLOCKED();
374
375 if (DO_UPDATE(vc)) {
376 hide_cursor(vc);
377 do_update_region(vc, start, count);
378 set_cursor(vc);
379 }
380 }
381
382 /* Structure of attributes is hardware-dependent */
383
384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
385 u8 _underline, u8 _reverse, u8 _italic)
386 {
387 if (vc->vc_sw->con_build_attr)
388 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
389 _blink, _underline, _reverse, _italic);
390
391 #ifndef VT_BUF_VRAM_ONLY
392 /*
393 * ++roman: I completely changed the attribute format for monochrome
394 * mode (!can_do_color). The formerly used MDA (monochrome display
395 * adapter) format didn't allow the combination of certain effects.
396 * Now the attribute is just a bit vector:
397 * Bit 0..1: intensity (0..2)
398 * Bit 2 : underline
399 * Bit 3 : reverse
400 * Bit 7 : blink
401 */
402 {
403 u8 a = vc->vc_color;
404 if (!vc->vc_can_do_color)
405 return _intensity |
406 (_italic ? 2 : 0) |
407 (_underline ? 4 : 0) |
408 (_reverse ? 8 : 0) |
409 (_blink ? 0x80 : 0);
410 if (_italic)
411 a = (a & 0xF0) | vc->vc_itcolor;
412 else if (_underline)
413 a = (a & 0xf0) | vc->vc_ulcolor;
414 else if (_intensity == 0)
415 a = (a & 0xf0) | vc->vc_ulcolor;
416 if (_reverse)
417 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
418 if (_blink)
419 a ^= 0x80;
420 if (_intensity == 2)
421 a ^= 0x08;
422 if (vc->vc_hi_font_mask == 0x100)
423 a <<= 1;
424 return a;
425 }
426 #else
427 return 0;
428 #endif
429 }
430
431 static void update_attr(struct vc_data *vc)
432 {
433 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
434 vc->vc_blink, vc->vc_underline,
435 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
436 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
437 }
438
439 /* Note: inverting the screen twice should revert to the original state */
440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
441 {
442 unsigned short *p;
443
444 WARN_CONSOLE_UNLOCKED();
445
446 count /= 2;
447 p = screenpos(vc, offset, viewed);
448 if (vc->vc_sw->con_invert_region)
449 vc->vc_sw->con_invert_region(vc, p, count);
450 #ifndef VT_BUF_VRAM_ONLY
451 else {
452 u16 *q = p;
453 int cnt = count;
454 u16 a;
455
456 if (!vc->vc_can_do_color) {
457 while (cnt--) {
458 a = scr_readw(q);
459 a ^= 0x0800;
460 scr_writew(a, q);
461 q++;
462 }
463 } else if (vc->vc_hi_font_mask == 0x100) {
464 while (cnt--) {
465 a = scr_readw(q);
466 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
467 scr_writew(a, q);
468 q++;
469 }
470 } else {
471 while (cnt--) {
472 a = scr_readw(q);
473 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
474 scr_writew(a, q);
475 q++;
476 }
477 }
478 }
479 #endif
480 if (DO_UPDATE(vc))
481 do_update_region(vc, (unsigned long) p, count);
482 }
483
484 /* used by selection: complement pointer position */
485 void complement_pos(struct vc_data *vc, int offset)
486 {
487 static int old_offset = -1;
488 static unsigned short old;
489 static unsigned short oldx, oldy;
490
491 WARN_CONSOLE_UNLOCKED();
492
493 if (old_offset != -1 && old_offset >= 0 &&
494 old_offset < vc->vc_screenbuf_size) {
495 scr_writew(old, screenpos(vc, old_offset, 1));
496 if (DO_UPDATE(vc))
497 vc->vc_sw->con_putc(vc, old, oldy, oldx);
498 }
499
500 old_offset = offset;
501
502 if (offset != -1 && offset >= 0 &&
503 offset < vc->vc_screenbuf_size) {
504 unsigned short new;
505 unsigned short *p;
506 p = screenpos(vc, offset, 1);
507 old = scr_readw(p);
508 new = old ^ vc->vc_complement_mask;
509 scr_writew(new, p);
510 if (DO_UPDATE(vc)) {
511 oldx = (offset >> 1) % vc->vc_cols;
512 oldy = (offset >> 1) / vc->vc_cols;
513 vc->vc_sw->con_putc(vc, new, oldy, oldx);
514 }
515 }
516
517 }
518
519 static void insert_char(struct vc_data *vc, unsigned int nr)
520 {
521 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
522
523 p = q + vc->vc_cols - nr - vc->vc_x;
524 while (--p >= q)
525 scr_writew(scr_readw(p), p + nr);
526 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
527 vc->vc_need_wrap = 0;
528 if (DO_UPDATE(vc)) {
529 unsigned short oldattr = vc->vc_attr;
530 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
531 vc->vc_cols - vc->vc_x - nr);
532 vc->vc_attr = vc->vc_video_erase_char >> 8;
533 while (nr--)
534 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
535 vc->vc_attr = oldattr;
536 }
537 }
538
539 static void delete_char(struct vc_data *vc, unsigned int nr)
540 {
541 unsigned int i = vc->vc_x;
542 unsigned short *p = (unsigned short *)vc->vc_pos;
543
544 while (++i <= vc->vc_cols - nr) {
545 scr_writew(scr_readw(p+nr), p);
546 p++;
547 }
548 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
549 vc->vc_need_wrap = 0;
550 if (DO_UPDATE(vc)) {
551 unsigned short oldattr = vc->vc_attr;
552 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
553 vc->vc_cols - vc->vc_x - nr);
554 vc->vc_attr = vc->vc_video_erase_char >> 8;
555 while (nr--)
556 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
557 vc->vc_cols - 1 - nr);
558 vc->vc_attr = oldattr;
559 }
560 }
561
562 static int softcursor_original;
563
564 static void add_softcursor(struct vc_data *vc)
565 {
566 int i = scr_readw((u16 *) vc->vc_pos);
567 u32 type = vc->vc_cursor_type;
568
569 if (! (type & 0x10)) return;
570 if (softcursor_original != -1) return;
571 softcursor_original = i;
572 i |= ((type >> 8) & 0xff00 );
573 i ^= ((type) & 0xff00 );
574 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
575 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
576 scr_writew(i, (u16 *) vc->vc_pos);
577 if (DO_UPDATE(vc))
578 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
579 }
580
581 static void hide_softcursor(struct vc_data *vc)
582 {
583 if (softcursor_original != -1) {
584 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
585 if (DO_UPDATE(vc))
586 vc->vc_sw->con_putc(vc, softcursor_original,
587 vc->vc_y, vc->vc_x);
588 softcursor_original = -1;
589 }
590 }
591
592 static void hide_cursor(struct vc_data *vc)
593 {
594 if (vc == sel_cons)
595 clear_selection();
596 vc->vc_sw->con_cursor(vc, CM_ERASE);
597 hide_softcursor(vc);
598 }
599
600 static void set_cursor(struct vc_data *vc)
601 {
602 if (!IS_FG(vc) || console_blanked ||
603 vc->vc_mode == KD_GRAPHICS)
604 return;
605 if (vc->vc_deccm) {
606 if (vc == sel_cons)
607 clear_selection();
608 add_softcursor(vc);
609 if ((vc->vc_cursor_type & 0x0f) != 1)
610 vc->vc_sw->con_cursor(vc, CM_DRAW);
611 } else
612 hide_cursor(vc);
613 }
614
615 static void set_origin(struct vc_data *vc)
616 {
617 WARN_CONSOLE_UNLOCKED();
618
619 if (!CON_IS_VISIBLE(vc) ||
620 !vc->vc_sw->con_set_origin ||
621 !vc->vc_sw->con_set_origin(vc))
622 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
623 vc->vc_visible_origin = vc->vc_origin;
624 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
625 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
626 }
627
628 static inline void save_screen(struct vc_data *vc)
629 {
630 WARN_CONSOLE_UNLOCKED();
631
632 if (vc->vc_sw->con_save_screen)
633 vc->vc_sw->con_save_screen(vc);
634 }
635
636 /*
637 * Redrawing of screen
638 */
639
640 static void clear_buffer_attributes(struct vc_data *vc)
641 {
642 unsigned short *p = (unsigned short *)vc->vc_origin;
643 int count = vc->vc_screenbuf_size / 2;
644 int mask = vc->vc_hi_font_mask | 0xff;
645
646 for (; count > 0; count--, p++) {
647 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
648 }
649 }
650
651 void redraw_screen(struct vc_data *vc, int is_switch)
652 {
653 int redraw = 0;
654
655 WARN_CONSOLE_UNLOCKED();
656
657 if (!vc) {
658 /* strange ... */
659 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
660 return;
661 }
662
663 if (is_switch) {
664 struct vc_data *old_vc = vc_cons[fg_console].d;
665 if (old_vc == vc)
666 return;
667 if (!CON_IS_VISIBLE(vc))
668 redraw = 1;
669 *vc->vc_display_fg = vc;
670 fg_console = vc->vc_num;
671 hide_cursor(old_vc);
672 if (!CON_IS_VISIBLE(old_vc)) {
673 save_screen(old_vc);
674 set_origin(old_vc);
675 }
676 } else {
677 hide_cursor(vc);
678 redraw = 1;
679 }
680
681 if (redraw) {
682 int update;
683 int old_was_color = vc->vc_can_do_color;
684
685 set_origin(vc);
686 update = vc->vc_sw->con_switch(vc);
687 set_palette(vc);
688 /*
689 * If console changed from mono<->color, the best we can do
690 * is to clear the buffer attributes. As it currently stands,
691 * rebuilding new attributes from the old buffer is not doable
692 * without overly complex code.
693 */
694 if (old_was_color != vc->vc_can_do_color) {
695 update_attr(vc);
696 clear_buffer_attributes(vc);
697 }
698 if (update && vc->vc_mode != KD_GRAPHICS)
699 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
700 }
701 set_cursor(vc);
702 if (is_switch) {
703 set_leds();
704 compute_shiftstate();
705 notify_update(vc);
706 }
707 }
708
709 /*
710 * Allocation, freeing and resizing of VTs.
711 */
712
713 int vc_cons_allocated(unsigned int i)
714 {
715 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
716 }
717
718 static void visual_init(struct vc_data *vc, int num, int init)
719 {
720 /* ++Geert: vc->vc_sw->con_init determines console size */
721 if (vc->vc_sw)
722 module_put(vc->vc_sw->owner);
723 vc->vc_sw = conswitchp;
724 #ifndef VT_SINGLE_DRIVER
725 if (con_driver_map[num])
726 vc->vc_sw = con_driver_map[num];
727 #endif
728 __module_get(vc->vc_sw->owner);
729 vc->vc_num = num;
730 vc->vc_display_fg = &master_display_fg;
731 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
732 vc->vc_uni_pagedir = 0;
733 vc->vc_hi_font_mask = 0;
734 vc->vc_complement_mask = 0;
735 vc->vc_can_do_color = 0;
736 vc->vc_sw->con_init(vc, init);
737 if (!vc->vc_complement_mask)
738 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
739 vc->vc_s_complement_mask = vc->vc_complement_mask;
740 vc->vc_size_row = vc->vc_cols << 1;
741 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
742 }
743
744 int vc_allocate(unsigned int currcons) /* return 0 on success */
745 {
746 WARN_CONSOLE_UNLOCKED();
747
748 if (currcons >= MAX_NR_CONSOLES)
749 return -ENXIO;
750 if (!vc_cons[currcons].d) {
751 struct vc_data *vc;
752 struct vt_notifier_param param;
753
754 /* prevent users from taking too much memory */
755 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
756 return -EPERM;
757
758 /* due to the granularity of kmalloc, we waste some memory here */
759 /* the alloc is done in two steps, to optimize the common situation
760 of a 25x80 console (structsize=216, screenbuf_size=4000) */
761 /* although the numbers above are not valid since long ago, the
762 point is still up-to-date and the comment still has its value
763 even if only as a historical artifact. --mj, July 1998 */
764 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
765 if (!vc)
766 return -ENOMEM;
767 vc_cons[currcons].d = vc;
768 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
769 visual_init(vc, currcons, 1);
770 if (!*vc->vc_uni_pagedir_loc)
771 con_set_default_unimap(vc);
772 if (!vc->vc_kmalloced)
773 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
774 if (!vc->vc_screenbuf) {
775 kfree(vc);
776 vc_cons[currcons].d = NULL;
777 return -ENOMEM;
778 }
779 vc->vc_kmalloced = 1;
780 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
781 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
782 }
783 return 0;
784 }
785
786 static inline int resize_screen(struct vc_data *vc, int width, int height,
787 int user)
788 {
789 /* Resizes the resolution of the display adapater */
790 int err = 0;
791
792 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
793 err = vc->vc_sw->con_resize(vc, width, height, user);
794
795 return err;
796 }
797
798 /*
799 * Change # of rows and columns (0 means unchanged/the size of fg_console)
800 * [this is to be used together with some user program
801 * like resize that changes the hardware videomode]
802 */
803 #define VC_RESIZE_MAXCOL (32767)
804 #define VC_RESIZE_MAXROW (32767)
805 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
806 {
807 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
808 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
809 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
810 unsigned int end, user;
811 unsigned short *newscreen;
812
813 WARN_CONSOLE_UNLOCKED();
814
815 if (!vc)
816 return -ENXIO;
817
818 user = vc->vc_resize_user;
819 vc->vc_resize_user = 0;
820
821 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
822 return -EINVAL;
823
824 new_cols = (cols ? cols : vc->vc_cols);
825 new_rows = (lines ? lines : vc->vc_rows);
826 new_row_size = new_cols << 1;
827 new_screen_size = new_row_size * new_rows;
828
829 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
830 return 0;
831
832 newscreen = kmalloc(new_screen_size, GFP_USER);
833 if (!newscreen)
834 return -ENOMEM;
835
836 old_rows = vc->vc_rows;
837 old_cols = vc->vc_cols;
838 old_row_size = vc->vc_size_row;
839 old_screen_size = vc->vc_screenbuf_size;
840
841 err = resize_screen(vc, new_cols, new_rows, user);
842 if (err) {
843 kfree(newscreen);
844 return err;
845 }
846
847 vc->vc_rows = new_rows;
848 vc->vc_cols = new_cols;
849 vc->vc_size_row = new_row_size;
850 vc->vc_screenbuf_size = new_screen_size;
851
852 rlth = min(old_row_size, new_row_size);
853 rrem = new_row_size - rlth;
854 old_origin = vc->vc_origin;
855 new_origin = (long) newscreen;
856 new_scr_end = new_origin + new_screen_size;
857
858 if (vc->vc_y > new_rows) {
859 if (old_rows - vc->vc_y < new_rows) {
860 /*
861 * Cursor near the bottom, copy contents from the
862 * bottom of buffer
863 */
864 old_origin += (old_rows - new_rows) * old_row_size;
865 end = vc->vc_scr_end;
866 } else {
867 /*
868 * Cursor is in no man's land, copy 1/2 screenful
869 * from the top and bottom of cursor position
870 */
871 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
872 end = old_origin + (old_row_size * new_rows);
873 }
874 } else
875 /*
876 * Cursor near the top, copy contents from the top of buffer
877 */
878 end = (old_rows > new_rows) ? old_origin +
879 (old_row_size * new_rows) :
880 vc->vc_scr_end;
881
882 update_attr(vc);
883
884 while (old_origin < end) {
885 scr_memcpyw((unsigned short *) new_origin,
886 (unsigned short *) old_origin, rlth);
887 if (rrem)
888 scr_memsetw((void *)(new_origin + rlth),
889 vc->vc_video_erase_char, rrem);
890 old_origin += old_row_size;
891 new_origin += new_row_size;
892 }
893 if (new_scr_end > new_origin)
894 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
895 new_scr_end - new_origin);
896 if (vc->vc_kmalloced)
897 kfree(vc->vc_screenbuf);
898 vc->vc_screenbuf = newscreen;
899 vc->vc_kmalloced = 1;
900 vc->vc_screenbuf_size = new_screen_size;
901 set_origin(vc);
902
903 /* do part of a reset_terminal() */
904 vc->vc_top = 0;
905 vc->vc_bottom = vc->vc_rows;
906 gotoxy(vc, vc->vc_x, vc->vc_y);
907 save_cur(vc);
908
909 if (vc->vc_tty) {
910 struct winsize ws, *cws = &vc->vc_tty->winsize;
911
912 memset(&ws, 0, sizeof(ws));
913 ws.ws_row = vc->vc_rows;
914 ws.ws_col = vc->vc_cols;
915 ws.ws_ypixel = vc->vc_scan_lines;
916 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
917 vc->vc_tty->pgrp)
918 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
919 *cws = ws;
920 }
921
922 if (CON_IS_VISIBLE(vc))
923 update_screen(vc);
924 return err;
925 }
926
927 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
928 {
929 int rc;
930
931 acquire_console_sem();
932 rc = vc_resize(vc, cols, lines);
933 release_console_sem();
934 return rc;
935 }
936
937 void vc_deallocate(unsigned int currcons)
938 {
939 WARN_CONSOLE_UNLOCKED();
940
941 if (vc_cons_allocated(currcons)) {
942 struct vc_data *vc = vc_cons[currcons].d;
943 struct vt_notifier_param param = { .vc = vc };
944 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
945 vc->vc_sw->con_deinit(vc);
946 put_pid(vc->vt_pid);
947 module_put(vc->vc_sw->owner);
948 if (vc->vc_kmalloced)
949 kfree(vc->vc_screenbuf);
950 if (currcons >= MIN_NR_CONSOLES)
951 kfree(vc);
952 vc_cons[currcons].d = NULL;
953 }
954 }
955
956 /*
957 * VT102 emulator
958 */
959
960 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
961 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
962 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
963
964 #define decarm VC_REPEAT
965 #define decckm VC_CKMODE
966 #define kbdapplic VC_APPLIC
967 #define lnm VC_CRLF
968
969 /*
970 * this is what the terminal answers to a ESC-Z or csi0c query.
971 */
972 #define VT100ID "\033[?1;2c"
973 #define VT102ID "\033[?6c"
974
975 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
976 8,12,10,14, 9,13,11,15 };
977
978 /* the default colour table, for VGA+ colour systems */
979 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
980 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
981 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
982 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
983 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
984 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
985
986 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
987 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
988 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
989
990 /*
991 * gotoxy() must verify all boundaries, because the arguments
992 * might also be negative. If the given position is out of
993 * bounds, the cursor is placed at the nearest margin.
994 */
995 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
996 {
997 int min_y, max_y;
998
999 if (new_x < 0)
1000 vc->vc_x = 0;
1001 else {
1002 if (new_x >= vc->vc_cols)
1003 vc->vc_x = vc->vc_cols - 1;
1004 else
1005 vc->vc_x = new_x;
1006 }
1007
1008 if (vc->vc_decom) {
1009 min_y = vc->vc_top;
1010 max_y = vc->vc_bottom;
1011 } else {
1012 min_y = 0;
1013 max_y = vc->vc_rows;
1014 }
1015 if (new_y < min_y)
1016 vc->vc_y = min_y;
1017 else if (new_y >= max_y)
1018 vc->vc_y = max_y - 1;
1019 else
1020 vc->vc_y = new_y;
1021 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1022 vc->vc_need_wrap = 0;
1023 }
1024
1025 /* for absolute user moves, when decom is set */
1026 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1027 {
1028 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1029 }
1030
1031 void scrollback(struct vc_data *vc, int lines)
1032 {
1033 if (!lines)
1034 lines = vc->vc_rows / 2;
1035 scrolldelta(-lines);
1036 }
1037
1038 void scrollfront(struct vc_data *vc, int lines)
1039 {
1040 if (!lines)
1041 lines = vc->vc_rows / 2;
1042 scrolldelta(lines);
1043 }
1044
1045 static void lf(struct vc_data *vc)
1046 {
1047 /* don't scroll if above bottom of scrolling region, or
1048 * if below scrolling region
1049 */
1050 if (vc->vc_y + 1 == vc->vc_bottom)
1051 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1052 else if (vc->vc_y < vc->vc_rows - 1) {
1053 vc->vc_y++;
1054 vc->vc_pos += vc->vc_size_row;
1055 }
1056 vc->vc_need_wrap = 0;
1057 notify_write(vc, '\n');
1058 }
1059
1060 static void ri(struct vc_data *vc)
1061 {
1062 /* don't scroll if below top of scrolling region, or
1063 * if above scrolling region
1064 */
1065 if (vc->vc_y == vc->vc_top)
1066 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1067 else if (vc->vc_y > 0) {
1068 vc->vc_y--;
1069 vc->vc_pos -= vc->vc_size_row;
1070 }
1071 vc->vc_need_wrap = 0;
1072 }
1073
1074 static inline void cr(struct vc_data *vc)
1075 {
1076 vc->vc_pos -= vc->vc_x << 1;
1077 vc->vc_need_wrap = vc->vc_x = 0;
1078 notify_write(vc, '\r');
1079 }
1080
1081 static inline void bs(struct vc_data *vc)
1082 {
1083 if (vc->vc_x) {
1084 vc->vc_pos -= 2;
1085 vc->vc_x--;
1086 vc->vc_need_wrap = 0;
1087 notify_write(vc, '\b');
1088 }
1089 }
1090
1091 static inline void del(struct vc_data *vc)
1092 {
1093 /* ignored */
1094 }
1095
1096 static void csi_J(struct vc_data *vc, int vpar)
1097 {
1098 unsigned int count;
1099 unsigned short * start;
1100
1101 switch (vpar) {
1102 case 0: /* erase from cursor to end of display */
1103 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1104 start = (unsigned short *)vc->vc_pos;
1105 if (DO_UPDATE(vc)) {
1106 /* do in two stages */
1107 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1108 vc->vc_cols - vc->vc_x);
1109 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1110 vc->vc_rows - vc->vc_y - 1,
1111 vc->vc_cols);
1112 }
1113 break;
1114 case 1: /* erase from start to cursor */
1115 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1116 start = (unsigned short *)vc->vc_origin;
1117 if (DO_UPDATE(vc)) {
1118 /* do in two stages */
1119 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1120 vc->vc_cols);
1121 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1122 vc->vc_x + 1);
1123 }
1124 break;
1125 case 2: /* erase whole display */
1126 count = vc->vc_cols * vc->vc_rows;
1127 start = (unsigned short *)vc->vc_origin;
1128 if (DO_UPDATE(vc))
1129 vc->vc_sw->con_clear(vc, 0, 0,
1130 vc->vc_rows,
1131 vc->vc_cols);
1132 break;
1133 default:
1134 return;
1135 }
1136 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1137 vc->vc_need_wrap = 0;
1138 }
1139
1140 static void csi_K(struct vc_data *vc, int vpar)
1141 {
1142 unsigned int count;
1143 unsigned short * start;
1144
1145 switch (vpar) {
1146 case 0: /* erase from cursor to end of line */
1147 count = vc->vc_cols - vc->vc_x;
1148 start = (unsigned short *)vc->vc_pos;
1149 if (DO_UPDATE(vc))
1150 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1151 vc->vc_cols - vc->vc_x);
1152 break;
1153 case 1: /* erase from start of line to cursor */
1154 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1155 count = vc->vc_x + 1;
1156 if (DO_UPDATE(vc))
1157 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1158 vc->vc_x + 1);
1159 break;
1160 case 2: /* erase whole line */
1161 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1162 count = vc->vc_cols;
1163 if (DO_UPDATE(vc))
1164 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1165 vc->vc_cols);
1166 break;
1167 default:
1168 return;
1169 }
1170 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1171 vc->vc_need_wrap = 0;
1172 }
1173
1174 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1175 { /* not vt100? */
1176 int count;
1177
1178 if (!vpar)
1179 vpar++;
1180 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1181
1182 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1183 if (DO_UPDATE(vc))
1184 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1185 vc->vc_need_wrap = 0;
1186 }
1187
1188 static void default_attr(struct vc_data *vc)
1189 {
1190 vc->vc_intensity = 1;
1191 vc->vc_italic = 0;
1192 vc->vc_underline = 0;
1193 vc->vc_reverse = 0;
1194 vc->vc_blink = 0;
1195 vc->vc_color = vc->vc_def_color;
1196 }
1197
1198 /* console_sem is held */
1199 static void csi_m(struct vc_data *vc)
1200 {
1201 int i;
1202
1203 for (i = 0; i <= vc->vc_npar; i++)
1204 switch (vc->vc_par[i]) {
1205 case 0: /* all attributes off */
1206 default_attr(vc);
1207 break;
1208 case 1:
1209 vc->vc_intensity = 2;
1210 break;
1211 case 2:
1212 vc->vc_intensity = 0;
1213 break;
1214 case 3:
1215 vc->vc_italic = 1;
1216 break;
1217 case 4:
1218 vc->vc_underline = 1;
1219 break;
1220 case 5:
1221 vc->vc_blink = 1;
1222 break;
1223 case 7:
1224 vc->vc_reverse = 1;
1225 break;
1226 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1227 * Select primary font, don't display
1228 * control chars if defined, don't set
1229 * bit 8 on output.
1230 */
1231 vc->vc_translate = set_translate(vc->vc_charset == 0
1232 ? vc->vc_G0_charset
1233 : vc->vc_G1_charset, vc);
1234 vc->vc_disp_ctrl = 0;
1235 vc->vc_toggle_meta = 0;
1236 break;
1237 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1238 * Select first alternate font, lets
1239 * chars < 32 be displayed as ROM chars.
1240 */
1241 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1242 vc->vc_disp_ctrl = 1;
1243 vc->vc_toggle_meta = 0;
1244 break;
1245 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1246 * Select second alternate font, toggle
1247 * high bit before displaying as ROM char.
1248 */
1249 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1250 vc->vc_disp_ctrl = 1;
1251 vc->vc_toggle_meta = 1;
1252 break;
1253 case 21:
1254 case 22:
1255 vc->vc_intensity = 1;
1256 break;
1257 case 23:
1258 vc->vc_italic = 0;
1259 break;
1260 case 24:
1261 vc->vc_underline = 0;
1262 break;
1263 case 25:
1264 vc->vc_blink = 0;
1265 break;
1266 case 27:
1267 vc->vc_reverse = 0;
1268 break;
1269 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1270 * Enables underscore, white foreground
1271 * with white underscore (Linux - use
1272 * default foreground).
1273 */
1274 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1275 vc->vc_underline = 1;
1276 break;
1277 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1278 * Disable underline option.
1279 * Reset colour to default? It did this
1280 * before...
1281 */
1282 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1283 vc->vc_underline = 0;
1284 break;
1285 case 49:
1286 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1287 break;
1288 default:
1289 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1290 vc->vc_color = color_table[vc->vc_par[i] - 30]
1291 | (vc->vc_color & 0xf0);
1292 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1293 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1294 | (vc->vc_color & 0x0f);
1295 break;
1296 }
1297 update_attr(vc);
1298 }
1299
1300 static void respond_string(const char *p, struct tty_struct *tty)
1301 {
1302 while (*p) {
1303 tty_insert_flip_char(tty, *p, 0);
1304 p++;
1305 }
1306 con_schedule_flip(tty);
1307 }
1308
1309 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1310 {
1311 char buf[40];
1312
1313 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1314 respond_string(buf, tty);
1315 }
1316
1317 static inline void status_report(struct tty_struct *tty)
1318 {
1319 respond_string("\033[0n", tty); /* Terminal ok */
1320 }
1321
1322 static inline void respond_ID(struct tty_struct * tty)
1323 {
1324 respond_string(VT102ID, tty);
1325 }
1326
1327 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1328 {
1329 char buf[8];
1330
1331 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1332 (char)('!' + mry));
1333 respond_string(buf, tty);
1334 }
1335
1336 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1337 int mouse_reporting(void)
1338 {
1339 return vc_cons[fg_console].d->vc_report_mouse;
1340 }
1341
1342 /* console_sem is held */
1343 static void set_mode(struct vc_data *vc, int on_off)
1344 {
1345 int i;
1346
1347 for (i = 0; i <= vc->vc_npar; i++)
1348 if (vc->vc_ques) {
1349 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1350 case 1: /* Cursor keys send ^[Ox/^[[x */
1351 if (on_off)
1352 set_kbd(vc, decckm);
1353 else
1354 clr_kbd(vc, decckm);
1355 break;
1356 case 3: /* 80/132 mode switch unimplemented */
1357 vc->vc_deccolm = on_off;
1358 #if 0
1359 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1360 /* this alone does not suffice; some user mode
1361 utility has to change the hardware regs */
1362 #endif
1363 break;
1364 case 5: /* Inverted screen on/off */
1365 if (vc->vc_decscnm != on_off) {
1366 vc->vc_decscnm = on_off;
1367 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1368 update_attr(vc);
1369 }
1370 break;
1371 case 6: /* Origin relative/absolute */
1372 vc->vc_decom = on_off;
1373 gotoxay(vc, 0, 0);
1374 break;
1375 case 7: /* Autowrap on/off */
1376 vc->vc_decawm = on_off;
1377 break;
1378 case 8: /* Autorepeat on/off */
1379 if (on_off)
1380 set_kbd(vc, decarm);
1381 else
1382 clr_kbd(vc, decarm);
1383 break;
1384 case 9:
1385 vc->vc_report_mouse = on_off ? 1 : 0;
1386 break;
1387 case 25: /* Cursor on/off */
1388 vc->vc_deccm = on_off;
1389 break;
1390 case 1000:
1391 vc->vc_report_mouse = on_off ? 2 : 0;
1392 break;
1393 }
1394 } else {
1395 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1396 case 3: /* Monitor (display ctrls) */
1397 vc->vc_disp_ctrl = on_off;
1398 break;
1399 case 4: /* Insert Mode on/off */
1400 vc->vc_decim = on_off;
1401 break;
1402 case 20: /* Lf, Enter == CrLf/Lf */
1403 if (on_off)
1404 set_kbd(vc, lnm);
1405 else
1406 clr_kbd(vc, lnm);
1407 break;
1408 }
1409 }
1410 }
1411
1412 /* console_sem is held */
1413 static void setterm_command(struct vc_data *vc)
1414 {
1415 switch(vc->vc_par[0]) {
1416 case 1: /* set color for underline mode */
1417 if (vc->vc_can_do_color &&
1418 vc->vc_par[1] < 16) {
1419 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1420 if (vc->vc_underline)
1421 update_attr(vc);
1422 }
1423 break;
1424 case 2: /* set color for half intensity mode */
1425 if (vc->vc_can_do_color &&
1426 vc->vc_par[1] < 16) {
1427 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1428 if (vc->vc_intensity == 0)
1429 update_attr(vc);
1430 }
1431 break;
1432 case 8: /* store colors as defaults */
1433 vc->vc_def_color = vc->vc_attr;
1434 if (vc->vc_hi_font_mask == 0x100)
1435 vc->vc_def_color >>= 1;
1436 default_attr(vc);
1437 update_attr(vc);
1438 break;
1439 case 9: /* set blanking interval */
1440 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1441 poke_blanked_console();
1442 break;
1443 case 10: /* set bell frequency in Hz */
1444 if (vc->vc_npar >= 1)
1445 vc->vc_bell_pitch = vc->vc_par[1];
1446 else
1447 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1448 break;
1449 case 11: /* set bell duration in msec */
1450 if (vc->vc_npar >= 1)
1451 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1452 vc->vc_par[1] * HZ / 1000 : 0;
1453 else
1454 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1455 break;
1456 case 12: /* bring specified console to the front */
1457 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1458 set_console(vc->vc_par[1] - 1);
1459 break;
1460 case 13: /* unblank the screen */
1461 poke_blanked_console();
1462 break;
1463 case 14: /* set vesa powerdown interval */
1464 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1465 break;
1466 case 15: /* activate the previous console */
1467 set_console(last_console);
1468 break;
1469 }
1470 }
1471
1472 /* console_sem is held */
1473 static void csi_at(struct vc_data *vc, unsigned int nr)
1474 {
1475 if (nr > vc->vc_cols - vc->vc_x)
1476 nr = vc->vc_cols - vc->vc_x;
1477 else if (!nr)
1478 nr = 1;
1479 insert_char(vc, nr);
1480 }
1481
1482 /* console_sem is held */
1483 static void csi_L(struct vc_data *vc, unsigned int nr)
1484 {
1485 if (nr > vc->vc_rows - vc->vc_y)
1486 nr = vc->vc_rows - vc->vc_y;
1487 else if (!nr)
1488 nr = 1;
1489 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1490 vc->vc_need_wrap = 0;
1491 }
1492
1493 /* console_sem is held */
1494 static void csi_P(struct vc_data *vc, unsigned int nr)
1495 {
1496 if (nr > vc->vc_cols - vc->vc_x)
1497 nr = vc->vc_cols - vc->vc_x;
1498 else if (!nr)
1499 nr = 1;
1500 delete_char(vc, nr);
1501 }
1502
1503 /* console_sem is held */
1504 static void csi_M(struct vc_data *vc, unsigned int nr)
1505 {
1506 if (nr > vc->vc_rows - vc->vc_y)
1507 nr = vc->vc_rows - vc->vc_y;
1508 else if (!nr)
1509 nr=1;
1510 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1511 vc->vc_need_wrap = 0;
1512 }
1513
1514 /* console_sem is held (except via vc_init->reset_terminal */
1515 static void save_cur(struct vc_data *vc)
1516 {
1517 vc->vc_saved_x = vc->vc_x;
1518 vc->vc_saved_y = vc->vc_y;
1519 vc->vc_s_intensity = vc->vc_intensity;
1520 vc->vc_s_italic = vc->vc_italic;
1521 vc->vc_s_underline = vc->vc_underline;
1522 vc->vc_s_blink = vc->vc_blink;
1523 vc->vc_s_reverse = vc->vc_reverse;
1524 vc->vc_s_charset = vc->vc_charset;
1525 vc->vc_s_color = vc->vc_color;
1526 vc->vc_saved_G0 = vc->vc_G0_charset;
1527 vc->vc_saved_G1 = vc->vc_G1_charset;
1528 }
1529
1530 /* console_sem is held */
1531 static void restore_cur(struct vc_data *vc)
1532 {
1533 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1534 vc->vc_intensity = vc->vc_s_intensity;
1535 vc->vc_italic = vc->vc_s_italic;
1536 vc->vc_underline = vc->vc_s_underline;
1537 vc->vc_blink = vc->vc_s_blink;
1538 vc->vc_reverse = vc->vc_s_reverse;
1539 vc->vc_charset = vc->vc_s_charset;
1540 vc->vc_color = vc->vc_s_color;
1541 vc->vc_G0_charset = vc->vc_saved_G0;
1542 vc->vc_G1_charset = vc->vc_saved_G1;
1543 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1544 update_attr(vc);
1545 vc->vc_need_wrap = 0;
1546 }
1547
1548 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1549 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1550 ESpalette };
1551
1552 /* console_sem is held (except via vc_init()) */
1553 static void reset_terminal(struct vc_data *vc, int do_clear)
1554 {
1555 vc->vc_top = 0;
1556 vc->vc_bottom = vc->vc_rows;
1557 vc->vc_state = ESnormal;
1558 vc->vc_ques = 0;
1559 vc->vc_translate = set_translate(LAT1_MAP, vc);
1560 vc->vc_G0_charset = LAT1_MAP;
1561 vc->vc_G1_charset = GRAF_MAP;
1562 vc->vc_charset = 0;
1563 vc->vc_need_wrap = 0;
1564 vc->vc_report_mouse = 0;
1565 vc->vc_utf = default_utf8;
1566 vc->vc_utf_count = 0;
1567
1568 vc->vc_disp_ctrl = 0;
1569 vc->vc_toggle_meta = 0;
1570
1571 vc->vc_decscnm = 0;
1572 vc->vc_decom = 0;
1573 vc->vc_decawm = 1;
1574 vc->vc_deccm = 1;
1575 vc->vc_decim = 0;
1576
1577 set_kbd(vc, decarm);
1578 clr_kbd(vc, decckm);
1579 clr_kbd(vc, kbdapplic);
1580 clr_kbd(vc, lnm);
1581 kbd_table[vc->vc_num].lockstate = 0;
1582 kbd_table[vc->vc_num].slockstate = 0;
1583 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1584 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1585 /* do not do set_leds here because this causes an endless tasklet loop
1586 when the keyboard hasn't been initialized yet */
1587
1588 vc->vc_cursor_type = CUR_DEFAULT;
1589 vc->vc_complement_mask = vc->vc_s_complement_mask;
1590
1591 default_attr(vc);
1592 update_attr(vc);
1593
1594 vc->vc_tab_stop[0] = 0x01010100;
1595 vc->vc_tab_stop[1] =
1596 vc->vc_tab_stop[2] =
1597 vc->vc_tab_stop[3] =
1598 vc->vc_tab_stop[4] = 0x01010101;
1599
1600 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1601 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1602
1603 gotoxy(vc, 0, 0);
1604 save_cur(vc);
1605 if (do_clear)
1606 csi_J(vc, 2);
1607 }
1608
1609 /* console_sem is held */
1610 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1611 {
1612 /*
1613 * Control characters can be used in the _middle_
1614 * of an escape sequence.
1615 */
1616 switch (c) {
1617 case 0:
1618 return;
1619 case 7:
1620 if (vc->vc_bell_duration)
1621 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1622 return;
1623 case 8:
1624 bs(vc);
1625 return;
1626 case 9:
1627 vc->vc_pos -= (vc->vc_x << 1);
1628 while (vc->vc_x < vc->vc_cols - 1) {
1629 vc->vc_x++;
1630 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1631 break;
1632 }
1633 vc->vc_pos += (vc->vc_x << 1);
1634 notify_write(vc, '\t');
1635 return;
1636 case 10: case 11: case 12:
1637 lf(vc);
1638 if (!is_kbd(vc, lnm))
1639 return;
1640 case 13:
1641 cr(vc);
1642 return;
1643 case 14:
1644 vc->vc_charset = 1;
1645 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1646 vc->vc_disp_ctrl = 1;
1647 return;
1648 case 15:
1649 vc->vc_charset = 0;
1650 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1651 vc->vc_disp_ctrl = 0;
1652 return;
1653 case 24: case 26:
1654 vc->vc_state = ESnormal;
1655 return;
1656 case 27:
1657 vc->vc_state = ESesc;
1658 return;
1659 case 127:
1660 del(vc);
1661 return;
1662 case 128+27:
1663 vc->vc_state = ESsquare;
1664 return;
1665 }
1666 switch(vc->vc_state) {
1667 case ESesc:
1668 vc->vc_state = ESnormal;
1669 switch (c) {
1670 case '[':
1671 vc->vc_state = ESsquare;
1672 return;
1673 case ']':
1674 vc->vc_state = ESnonstd;
1675 return;
1676 case '%':
1677 vc->vc_state = ESpercent;
1678 return;
1679 case 'E':
1680 cr(vc);
1681 lf(vc);
1682 return;
1683 case 'M':
1684 ri(vc);
1685 return;
1686 case 'D':
1687 lf(vc);
1688 return;
1689 case 'H':
1690 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1691 return;
1692 case 'Z':
1693 respond_ID(tty);
1694 return;
1695 case '7':
1696 save_cur(vc);
1697 return;
1698 case '8':
1699 restore_cur(vc);
1700 return;
1701 case '(':
1702 vc->vc_state = ESsetG0;
1703 return;
1704 case ')':
1705 vc->vc_state = ESsetG1;
1706 return;
1707 case '#':
1708 vc->vc_state = EShash;
1709 return;
1710 case 'c':
1711 reset_terminal(vc, 1);
1712 return;
1713 case '>': /* Numeric keypad */
1714 clr_kbd(vc, kbdapplic);
1715 return;
1716 case '=': /* Appl. keypad */
1717 set_kbd(vc, kbdapplic);
1718 return;
1719 }
1720 return;
1721 case ESnonstd:
1722 if (c=='P') { /* palette escape sequence */
1723 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1724 vc->vc_par[vc->vc_npar] = 0;
1725 vc->vc_npar = 0;
1726 vc->vc_state = ESpalette;
1727 return;
1728 } else if (c=='R') { /* reset palette */
1729 reset_palette(vc);
1730 vc->vc_state = ESnormal;
1731 } else
1732 vc->vc_state = ESnormal;
1733 return;
1734 case ESpalette:
1735 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1736 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1737 if (vc->vc_npar == 7) {
1738 int i = vc->vc_par[0] * 3, j = 1;
1739 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1740 vc->vc_palette[i++] += vc->vc_par[j++];
1741 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1742 vc->vc_palette[i++] += vc->vc_par[j++];
1743 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1744 vc->vc_palette[i] += vc->vc_par[j];
1745 set_palette(vc);
1746 vc->vc_state = ESnormal;
1747 }
1748 } else
1749 vc->vc_state = ESnormal;
1750 return;
1751 case ESsquare:
1752 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1753 vc->vc_par[vc->vc_npar] = 0;
1754 vc->vc_npar = 0;
1755 vc->vc_state = ESgetpars;
1756 if (c == '[') { /* Function key */
1757 vc->vc_state=ESfunckey;
1758 return;
1759 }
1760 vc->vc_ques = (c == '?');
1761 if (vc->vc_ques)
1762 return;
1763 case ESgetpars:
1764 if (c == ';' && vc->vc_npar < NPAR - 1) {
1765 vc->vc_npar++;
1766 return;
1767 } else if (c>='0' && c<='9') {
1768 vc->vc_par[vc->vc_npar] *= 10;
1769 vc->vc_par[vc->vc_npar] += c - '0';
1770 return;
1771 } else
1772 vc->vc_state = ESgotpars;
1773 case ESgotpars:
1774 vc->vc_state = ESnormal;
1775 switch(c) {
1776 case 'h':
1777 set_mode(vc, 1);
1778 return;
1779 case 'l':
1780 set_mode(vc, 0);
1781 return;
1782 case 'c':
1783 if (vc->vc_ques) {
1784 if (vc->vc_par[0])
1785 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1786 else
1787 vc->vc_cursor_type = CUR_DEFAULT;
1788 return;
1789 }
1790 break;
1791 case 'm':
1792 if (vc->vc_ques) {
1793 clear_selection();
1794 if (vc->vc_par[0])
1795 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1796 else
1797 vc->vc_complement_mask = vc->vc_s_complement_mask;
1798 return;
1799 }
1800 break;
1801 case 'n':
1802 if (!vc->vc_ques) {
1803 if (vc->vc_par[0] == 5)
1804 status_report(tty);
1805 else if (vc->vc_par[0] == 6)
1806 cursor_report(vc, tty);
1807 }
1808 return;
1809 }
1810 if (vc->vc_ques) {
1811 vc->vc_ques = 0;
1812 return;
1813 }
1814 switch(c) {
1815 case 'G': case '`':
1816 if (vc->vc_par[0])
1817 vc->vc_par[0]--;
1818 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1819 return;
1820 case 'A':
1821 if (!vc->vc_par[0])
1822 vc->vc_par[0]++;
1823 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1824 return;
1825 case 'B': case 'e':
1826 if (!vc->vc_par[0])
1827 vc->vc_par[0]++;
1828 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1829 return;
1830 case 'C': case 'a':
1831 if (!vc->vc_par[0])
1832 vc->vc_par[0]++;
1833 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1834 return;
1835 case 'D':
1836 if (!vc->vc_par[0])
1837 vc->vc_par[0]++;
1838 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1839 return;
1840 case 'E':
1841 if (!vc->vc_par[0])
1842 vc->vc_par[0]++;
1843 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1844 return;
1845 case 'F':
1846 if (!vc->vc_par[0])
1847 vc->vc_par[0]++;
1848 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1849 return;
1850 case 'd':
1851 if (vc->vc_par[0])
1852 vc->vc_par[0]--;
1853 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1854 return;
1855 case 'H': case 'f':
1856 if (vc->vc_par[0])
1857 vc->vc_par[0]--;
1858 if (vc->vc_par[1])
1859 vc->vc_par[1]--;
1860 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1861 return;
1862 case 'J':
1863 csi_J(vc, vc->vc_par[0]);
1864 return;
1865 case 'K':
1866 csi_K(vc, vc->vc_par[0]);
1867 return;
1868 case 'L':
1869 csi_L(vc, vc->vc_par[0]);
1870 return;
1871 case 'M':
1872 csi_M(vc, vc->vc_par[0]);
1873 return;
1874 case 'P':
1875 csi_P(vc, vc->vc_par[0]);
1876 return;
1877 case 'c':
1878 if (!vc->vc_par[0])
1879 respond_ID(tty);
1880 return;
1881 case 'g':
1882 if (!vc->vc_par[0])
1883 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1884 else if (vc->vc_par[0] == 3) {
1885 vc->vc_tab_stop[0] =
1886 vc->vc_tab_stop[1] =
1887 vc->vc_tab_stop[2] =
1888 vc->vc_tab_stop[3] =
1889 vc->vc_tab_stop[4] = 0;
1890 }
1891 return;
1892 case 'm':
1893 csi_m(vc);
1894 return;
1895 case 'q': /* DECLL - but only 3 leds */
1896 /* map 0,1,2,3 to 0,1,2,4 */
1897 if (vc->vc_par[0] < 4)
1898 setledstate(kbd_table + vc->vc_num,
1899 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1900 return;
1901 case 'r':
1902 if (!vc->vc_par[0])
1903 vc->vc_par[0]++;
1904 if (!vc->vc_par[1])
1905 vc->vc_par[1] = vc->vc_rows;
1906 /* Minimum allowed region is 2 lines */
1907 if (vc->vc_par[0] < vc->vc_par[1] &&
1908 vc->vc_par[1] <= vc->vc_rows) {
1909 vc->vc_top = vc->vc_par[0] - 1;
1910 vc->vc_bottom = vc->vc_par[1];
1911 gotoxay(vc, 0, 0);
1912 }
1913 return;
1914 case 's':
1915 save_cur(vc);
1916 return;
1917 case 'u':
1918 restore_cur(vc);
1919 return;
1920 case 'X':
1921 csi_X(vc, vc->vc_par[0]);
1922 return;
1923 case '@':
1924 csi_at(vc, vc->vc_par[0]);
1925 return;
1926 case ']': /* setterm functions */
1927 setterm_command(vc);
1928 return;
1929 }
1930 return;
1931 case ESpercent:
1932 vc->vc_state = ESnormal;
1933 switch (c) {
1934 case '@': /* defined in ISO 2022 */
1935 vc->vc_utf = 0;
1936 return;
1937 case 'G': /* prelim official escape code */
1938 case '8': /* retained for compatibility */
1939 vc->vc_utf = 1;
1940 return;
1941 }
1942 return;
1943 case ESfunckey:
1944 vc->vc_state = ESnormal;
1945 return;
1946 case EShash:
1947 vc->vc_state = ESnormal;
1948 if (c == '8') {
1949 /* DEC screen alignment test. kludge :-) */
1950 vc->vc_video_erase_char =
1951 (vc->vc_video_erase_char & 0xff00) | 'E';
1952 csi_J(vc, 2);
1953 vc->vc_video_erase_char =
1954 (vc->vc_video_erase_char & 0xff00) | ' ';
1955 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1956 }
1957 return;
1958 case ESsetG0:
1959 if (c == '0')
1960 vc->vc_G0_charset = GRAF_MAP;
1961 else if (c == 'B')
1962 vc->vc_G0_charset = LAT1_MAP;
1963 else if (c == 'U')
1964 vc->vc_G0_charset = IBMPC_MAP;
1965 else if (c == 'K')
1966 vc->vc_G0_charset = USER_MAP;
1967 if (vc->vc_charset == 0)
1968 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1969 vc->vc_state = ESnormal;
1970 return;
1971 case ESsetG1:
1972 if (c == '0')
1973 vc->vc_G1_charset = GRAF_MAP;
1974 else if (c == 'B')
1975 vc->vc_G1_charset = LAT1_MAP;
1976 else if (c == 'U')
1977 vc->vc_G1_charset = IBMPC_MAP;
1978 else if (c == 'K')
1979 vc->vc_G1_charset = USER_MAP;
1980 if (vc->vc_charset == 1)
1981 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1982 vc->vc_state = ESnormal;
1983 return;
1984 default:
1985 vc->vc_state = ESnormal;
1986 }
1987 }
1988
1989 /* This is a temporary buffer used to prepare a tty console write
1990 * so that we can easily avoid touching user space while holding the
1991 * console spinlock. It is allocated in con_init and is shared by
1992 * this code and the vc_screen read/write tty calls.
1993 *
1994 * We have to allocate this statically in the kernel data section
1995 * since console_init (and thus con_init) are called before any
1996 * kernel memory allocation is available.
1997 */
1998 char con_buf[CON_BUF_SIZE];
1999 DEFINE_MUTEX(con_buf_mtx);
2000
2001 /* is_double_width() is based on the wcwidth() implementation by
2002 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2003 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2004 */
2005 struct interval {
2006 uint32_t first;
2007 uint32_t last;
2008 };
2009
2010 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2011 {
2012 int min = 0;
2013 int mid;
2014
2015 if (ucs < table[0].first || ucs > table[max].last)
2016 return 0;
2017 while (max >= min) {
2018 mid = (min + max) / 2;
2019 if (ucs > table[mid].last)
2020 min = mid + 1;
2021 else if (ucs < table[mid].first)
2022 max = mid - 1;
2023 else
2024 return 1;
2025 }
2026 return 0;
2027 }
2028
2029 static int is_double_width(uint32_t ucs)
2030 {
2031 static const struct interval double_width[] = {
2032 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2033 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2034 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2035 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2036 };
2037 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2038 }
2039
2040 /* acquires console_sem */
2041 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2042 {
2043 #ifdef VT_BUF_VRAM_ONLY
2044 #define FLUSH do { } while(0);
2045 #else
2046 #define FLUSH if (draw_x >= 0) { \
2047 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2048 draw_x = -1; \
2049 }
2050 #endif
2051
2052 int c, tc, ok, n = 0, draw_x = -1;
2053 unsigned int currcons;
2054 unsigned long draw_from = 0, draw_to = 0;
2055 struct vc_data *vc;
2056 unsigned char vc_attr;
2057 uint8_t rescan;
2058 uint8_t inverse;
2059 uint8_t width;
2060 u16 himask, charmask;
2061 const unsigned char *orig_buf = NULL;
2062 int orig_count;
2063
2064 if (in_interrupt())
2065 return count;
2066
2067 might_sleep();
2068
2069 acquire_console_sem();
2070 vc = tty->driver_data;
2071 if (vc == NULL) {
2072 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2073 release_console_sem();
2074 return 0;
2075 }
2076
2077 currcons = vc->vc_num;
2078 if (!vc_cons_allocated(currcons)) {
2079 /* could this happen? */
2080 static int error = 0;
2081 if (!error) {
2082 error = 1;
2083 printk("con_write: tty %d not allocated\n", currcons+1);
2084 }
2085 release_console_sem();
2086 return 0;
2087 }
2088 release_console_sem();
2089
2090 orig_buf = buf;
2091 orig_count = count;
2092
2093 /* At this point 'buf' is guaranteed to be a kernel buffer
2094 * and therefore no access to userspace (and therefore sleeping)
2095 * will be needed. The con_buf_mtx serializes all tty based
2096 * console rendering and vcs write/read operations. We hold
2097 * the console spinlock during the entire write.
2098 */
2099
2100 acquire_console_sem();
2101
2102 vc = tty->driver_data;
2103 if (vc == NULL) {
2104 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2105 release_console_sem();
2106 goto out;
2107 }
2108
2109 himask = vc->vc_hi_font_mask;
2110 charmask = himask ? 0x1ff : 0xff;
2111
2112 /* undraw cursor first */
2113 if (IS_FG(vc))
2114 hide_cursor(vc);
2115
2116 while (!tty->stopped && count) {
2117 int orig = *buf;
2118 c = orig;
2119 buf++;
2120 n++;
2121 count--;
2122 rescan = 0;
2123 inverse = 0;
2124 width = 1;
2125
2126 /* Do no translation at all in control states */
2127 if (vc->vc_state != ESnormal) {
2128 tc = c;
2129 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2130 /* Combine UTF-8 into Unicode in vc_utf_char.
2131 * vc_utf_count is the number of continuation bytes still
2132 * expected to arrive.
2133 * vc_npar is the number of continuation bytes arrived so
2134 * far
2135 */
2136 rescan_last_byte:
2137 if ((c & 0xc0) == 0x80) {
2138 /* Continuation byte received */
2139 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2140 if (vc->vc_utf_count) {
2141 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2142 vc->vc_npar++;
2143 if (--vc->vc_utf_count) {
2144 /* Still need some bytes */
2145 continue;
2146 }
2147 /* Got a whole character */
2148 c = vc->vc_utf_char;
2149 /* Reject overlong sequences */
2150 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2151 c > utf8_length_changes[vc->vc_npar])
2152 c = 0xfffd;
2153 } else {
2154 /* Unexpected continuation byte */
2155 vc->vc_utf_count = 0;
2156 c = 0xfffd;
2157 }
2158 } else {
2159 /* Single ASCII byte or first byte of a sequence received */
2160 if (vc->vc_utf_count) {
2161 /* Continuation byte expected */
2162 rescan = 1;
2163 vc->vc_utf_count = 0;
2164 c = 0xfffd;
2165 } else if (c > 0x7f) {
2166 /* First byte of a multibyte sequence received */
2167 vc->vc_npar = 0;
2168 if ((c & 0xe0) == 0xc0) {
2169 vc->vc_utf_count = 1;
2170 vc->vc_utf_char = (c & 0x1f);
2171 } else if ((c & 0xf0) == 0xe0) {
2172 vc->vc_utf_count = 2;
2173 vc->vc_utf_char = (c & 0x0f);
2174 } else if ((c & 0xf8) == 0xf0) {
2175 vc->vc_utf_count = 3;
2176 vc->vc_utf_char = (c & 0x07);
2177 } else if ((c & 0xfc) == 0xf8) {
2178 vc->vc_utf_count = 4;
2179 vc->vc_utf_char = (c & 0x03);
2180 } else if ((c & 0xfe) == 0xfc) {
2181 vc->vc_utf_count = 5;
2182 vc->vc_utf_char = (c & 0x01);
2183 } else {
2184 /* 254 and 255 are invalid */
2185 c = 0xfffd;
2186 }
2187 if (vc->vc_utf_count) {
2188 /* Still need some bytes */
2189 continue;
2190 }
2191 }
2192 /* Nothing to do if an ASCII byte was received */
2193 }
2194 /* End of UTF-8 decoding. */
2195 /* c is the received character, or U+FFFD for invalid sequences. */
2196 /* Replace invalid Unicode code points with U+FFFD too */
2197 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2198 c = 0xfffd;
2199 tc = c;
2200 } else { /* no utf or alternate charset mode */
2201 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2202 }
2203
2204 /* If the original code was a control character we
2205 * only allow a glyph to be displayed if the code is
2206 * not normally used (such as for cursor movement) or
2207 * if the disp_ctrl mode has been explicitly enabled.
2208 * Certain characters (as given by the CTRL_ALWAYS
2209 * bitmap) are always displayed as control characters,
2210 * as the console would be pretty useless without
2211 * them; to display an arbitrary font position use the
2212 * direct-to-font zone in UTF-8 mode.
2213 */
2214 ok = tc && (c >= 32 ||
2215 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2216 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2217 && (c != 127 || vc->vc_disp_ctrl)
2218 && (c != 128+27);
2219
2220 if (vc->vc_state == ESnormal && ok) {
2221 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2222 if (is_double_width(c))
2223 width = 2;
2224 }
2225 /* Now try to find out how to display it */
2226 tc = conv_uni_to_pc(vc, tc);
2227 if (tc & ~charmask) {
2228 if (tc == -1 || tc == -2) {
2229 continue; /* nothing to display */
2230 }
2231 /* Glyph not found */
2232 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2233 /* In legacy mode use the glyph we get by a 1:1 mapping.
2234 This would make absolutely no sense with Unicode in mind,
2235 but do this for ASCII characters since a font may lack
2236 Unicode mapping info and we don't want to end up with
2237 having question marks only. */
2238 tc = c;
2239 } else {
2240 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2241 tc = conv_uni_to_pc(vc, 0xfffd);
2242 if (tc < 0) {
2243 inverse = 1;
2244 tc = conv_uni_to_pc(vc, '?');
2245 if (tc < 0) tc = '?';
2246 }
2247 }
2248 }
2249
2250 if (!inverse) {
2251 vc_attr = vc->vc_attr;
2252 } else {
2253 /* invert vc_attr */
2254 if (!vc->vc_can_do_color) {
2255 vc_attr = (vc->vc_attr) ^ 0x08;
2256 } else if (vc->vc_hi_font_mask == 0x100) {
2257 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2258 } else {
2259 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2260 }
2261 FLUSH
2262 }
2263
2264 while (1) {
2265 if (vc->vc_need_wrap || vc->vc_decim)
2266 FLUSH
2267 if (vc->vc_need_wrap) {
2268 cr(vc);
2269 lf(vc);
2270 }
2271 if (vc->vc_decim)
2272 insert_char(vc, 1);
2273 scr_writew(himask ?
2274 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2275 (vc_attr << 8) + tc,
2276 (u16 *) vc->vc_pos);
2277 if (DO_UPDATE(vc) && draw_x < 0) {
2278 draw_x = vc->vc_x;
2279 draw_from = vc->vc_pos;
2280 }
2281 if (vc->vc_x == vc->vc_cols - 1) {
2282 vc->vc_need_wrap = vc->vc_decawm;
2283 draw_to = vc->vc_pos + 2;
2284 } else {
2285 vc->vc_x++;
2286 draw_to = (vc->vc_pos += 2);
2287 }
2288
2289 if (!--width) break;
2290
2291 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2292 if (tc < 0) tc = ' ';
2293 }
2294 notify_write(vc, c);
2295
2296 if (inverse) {
2297 FLUSH
2298 }
2299
2300 if (rescan) {
2301 rescan = 0;
2302 inverse = 0;
2303 width = 1;
2304 c = orig;
2305 goto rescan_last_byte;
2306 }
2307 continue;
2308 }
2309 FLUSH
2310 do_con_trol(tty, vc, orig);
2311 }
2312 FLUSH
2313 console_conditional_schedule();
2314 release_console_sem();
2315
2316 out:
2317 notify_update(vc);
2318 return n;
2319 #undef FLUSH
2320 }
2321
2322 /*
2323 * This is the console switching callback.
2324 *
2325 * Doing console switching in a process context allows
2326 * us to do the switches asynchronously (needed when we want
2327 * to switch due to a keyboard interrupt). Synchronization
2328 * with other console code and prevention of re-entrancy is
2329 * ensured with console_sem.
2330 */
2331 static void console_callback(struct work_struct *ignored)
2332 {
2333 acquire_console_sem();
2334
2335 if (want_console >= 0) {
2336 if (want_console != fg_console &&
2337 vc_cons_allocated(want_console)) {
2338 hide_cursor(vc_cons[fg_console].d);
2339 change_console(vc_cons[want_console].d);
2340 /* we only changed when the console had already
2341 been allocated - a new console is not created
2342 in an interrupt routine */
2343 }
2344 want_console = -1;
2345 }
2346 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2347 do_poke_blanked_console = 0;
2348 poke_blanked_console();
2349 }
2350 if (scrollback_delta) {
2351 struct vc_data *vc = vc_cons[fg_console].d;
2352 clear_selection();
2353 if (vc->vc_mode == KD_TEXT)
2354 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2355 scrollback_delta = 0;
2356 }
2357 if (blank_timer_expired) {
2358 do_blank_screen(0);
2359 blank_timer_expired = 0;
2360 }
2361 notify_update(vc_cons[fg_console].d);
2362
2363 release_console_sem();
2364 }
2365
2366 int set_console(int nr)
2367 {
2368 struct vc_data *vc = vc_cons[fg_console].d;
2369
2370 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2371 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2372
2373 /*
2374 * Console switch will fail in console_callback() or
2375 * change_console() so there is no point scheduling
2376 * the callback
2377 *
2378 * Existing set_console() users don't check the return
2379 * value so this shouldn't break anything
2380 */
2381 return -EINVAL;
2382 }
2383
2384 want_console = nr;
2385 schedule_console_callback();
2386
2387 return 0;
2388 }
2389
2390 struct tty_driver *console_driver;
2391
2392 #ifdef CONFIG_VT_CONSOLE
2393
2394 /*
2395 * Console on virtual terminal
2396 *
2397 * The console must be locked when we get here.
2398 */
2399
2400 static void vt_console_print(struct console *co, const char *b, unsigned count)
2401 {
2402 struct vc_data *vc = vc_cons[fg_console].d;
2403 unsigned char c;
2404 static DEFINE_SPINLOCK(printing_lock);
2405 const ushort *start;
2406 ushort cnt = 0;
2407 ushort myx;
2408
2409 /* console busy or not yet initialized */
2410 if (!printable)
2411 return;
2412 if (!spin_trylock(&printing_lock))
2413 return;
2414
2415 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2416 vc = vc_cons[kmsg_redirect - 1].d;
2417
2418 /* read `x' only after setting currcons properly (otherwise
2419 the `x' macro will read the x of the foreground console). */
2420 myx = vc->vc_x;
2421
2422 if (!vc_cons_allocated(fg_console)) {
2423 /* impossible */
2424 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2425 goto quit;
2426 }
2427
2428 if (vc->vc_mode != KD_TEXT)
2429 goto quit;
2430
2431 /* undraw cursor first */
2432 if (IS_FG(vc))
2433 hide_cursor(vc);
2434
2435 start = (ushort *)vc->vc_pos;
2436
2437 /* Contrived structure to try to emulate original need_wrap behaviour
2438 * Problems caused when we have need_wrap set on '\n' character */
2439 while (count--) {
2440 c = *b++;
2441 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2442 if (cnt > 0) {
2443 if (CON_IS_VISIBLE(vc))
2444 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2445 vc->vc_x += cnt;
2446 if (vc->vc_need_wrap)
2447 vc->vc_x--;
2448 cnt = 0;
2449 }
2450 if (c == 8) { /* backspace */
2451 bs(vc);
2452 start = (ushort *)vc->vc_pos;
2453 myx = vc->vc_x;
2454 continue;
2455 }
2456 if (c != 13)
2457 lf(vc);
2458 cr(vc);
2459 start = (ushort *)vc->vc_pos;
2460 myx = vc->vc_x;
2461 if (c == 10 || c == 13)
2462 continue;
2463 }
2464 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2465 notify_write(vc, c);
2466 cnt++;
2467 if (myx == vc->vc_cols - 1) {
2468 vc->vc_need_wrap = 1;
2469 continue;
2470 }
2471 vc->vc_pos += 2;
2472 myx++;
2473 }
2474 if (cnt > 0) {
2475 if (CON_IS_VISIBLE(vc))
2476 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2477 vc->vc_x += cnt;
2478 if (vc->vc_x == vc->vc_cols) {
2479 vc->vc_x--;
2480 vc->vc_need_wrap = 1;
2481 }
2482 }
2483 set_cursor(vc);
2484 notify_update(vc);
2485
2486 quit:
2487 spin_unlock(&printing_lock);
2488 }
2489
2490 static struct tty_driver *vt_console_device(struct console *c, int *index)
2491 {
2492 *index = c->index ? c->index-1 : fg_console;
2493 return console_driver;
2494 }
2495
2496 static struct console vt_console_driver = {
2497 .name = "tty",
2498 .write = vt_console_print,
2499 .device = vt_console_device,
2500 .unblank = unblank_screen,
2501 .flags = CON_PRINTBUFFER,
2502 .index = -1,
2503 };
2504 #endif
2505
2506 /*
2507 * Handling of Linux-specific VC ioctls
2508 */
2509
2510 /*
2511 * Generally a bit racy with respect to console_sem().
2512 *
2513 * There are some functions which don't need it.
2514 *
2515 * There are some functions which can sleep for arbitrary periods
2516 * (paste_selection) but we don't need the lock there anyway.
2517 *
2518 * set_selection has locking, and definitely needs it
2519 */
2520
2521 int tioclinux(struct tty_struct *tty, unsigned long arg)
2522 {
2523 char type, data;
2524 char __user *p = (char __user *)arg;
2525 int lines;
2526 int ret;
2527
2528 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2529 return -EINVAL;
2530 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2531 return -EPERM;
2532 if (get_user(type, p))
2533 return -EFAULT;
2534 ret = 0;
2535 switch (type)
2536 {
2537 case TIOCL_SETSEL:
2538 acquire_console_sem();
2539 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2540 release_console_sem();
2541 break;
2542 case TIOCL_PASTESEL:
2543 ret = paste_selection(tty);
2544 break;
2545 case TIOCL_UNBLANKSCREEN:
2546 acquire_console_sem();
2547 unblank_screen();
2548 release_console_sem();
2549 break;
2550 case TIOCL_SELLOADLUT:
2551 ret = sel_loadlut(p);
2552 break;
2553 case TIOCL_GETSHIFTSTATE:
2554
2555 /*
2556 * Make it possible to react to Shift+Mousebutton.
2557 * Note that 'shift_state' is an undocumented
2558 * kernel-internal variable; programs not closely
2559 * related to the kernel should not use this.
2560 */
2561 data = shift_state;
2562 ret = __put_user(data, p);
2563 break;
2564 case TIOCL_GETMOUSEREPORTING:
2565 data = mouse_reporting();
2566 ret = __put_user(data, p);
2567 break;
2568 case TIOCL_SETVESABLANK:
2569 ret = set_vesa_blanking(p);
2570 break;
2571 case TIOCL_GETKMSGREDIRECT:
2572 data = kmsg_redirect;
2573 ret = __put_user(data, p);
2574 break;
2575 case TIOCL_SETKMSGREDIRECT:
2576 if (!capable(CAP_SYS_ADMIN)) {
2577 ret = -EPERM;
2578 } else {
2579 if (get_user(data, p+1))
2580 ret = -EFAULT;
2581 else
2582 kmsg_redirect = data;
2583 }
2584 break;
2585 case TIOCL_GETFGCONSOLE:
2586 ret = fg_console;
2587 break;
2588 case TIOCL_SCROLLCONSOLE:
2589 if (get_user(lines, (s32 __user *)(p+4))) {
2590 ret = -EFAULT;
2591 } else {
2592 scrollfront(vc_cons[fg_console].d, lines);
2593 ret = 0;
2594 }
2595 break;
2596 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2597 acquire_console_sem();
2598 ignore_poke = 1;
2599 do_blank_screen(0);
2600 release_console_sem();
2601 break;
2602 case TIOCL_BLANKEDSCREEN:
2603 ret = console_blanked;
2604 break;
2605 default:
2606 ret = -EINVAL;
2607 break;
2608 }
2609 return ret;
2610 }
2611
2612 /*
2613 * /dev/ttyN handling
2614 */
2615
2616 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2617 {
2618 int retval;
2619
2620 retval = do_con_write(tty, buf, count);
2621 con_flush_chars(tty);
2622
2623 return retval;
2624 }
2625
2626 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2627 {
2628 if (in_interrupt())
2629 return; /* n_r3964 calls put_char() from interrupt context */
2630 do_con_write(tty, &ch, 1);
2631 }
2632
2633 static int con_write_room(struct tty_struct *tty)
2634 {
2635 if (tty->stopped)
2636 return 0;
2637 return 4096; /* No limit, really; we're not buffering */
2638 }
2639
2640 static int con_chars_in_buffer(struct tty_struct *tty)
2641 {
2642 return 0; /* we're not buffering */
2643 }
2644
2645 /*
2646 * con_throttle and con_unthrottle are only used for
2647 * paste_selection(), which has to stuff in a large number of
2648 * characters...
2649 */
2650 static void con_throttle(struct tty_struct *tty)
2651 {
2652 }
2653
2654 static void con_unthrottle(struct tty_struct *tty)
2655 {
2656 struct vc_data *vc = tty->driver_data;
2657
2658 wake_up_interruptible(&vc->paste_wait);
2659 }
2660
2661 /*
2662 * Turn the Scroll-Lock LED on when the tty is stopped
2663 */
2664 static void con_stop(struct tty_struct *tty)
2665 {
2666 int console_num;
2667 if (!tty)
2668 return;
2669 console_num = tty->index;
2670 if (!vc_cons_allocated(console_num))
2671 return;
2672 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2673 set_leds();
2674 }
2675
2676 /*
2677 * Turn the Scroll-Lock LED off when the console is started
2678 */
2679 static void con_start(struct tty_struct *tty)
2680 {
2681 int console_num;
2682 if (!tty)
2683 return;
2684 console_num = tty->index;
2685 if (!vc_cons_allocated(console_num))
2686 return;
2687 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2688 set_leds();
2689 }
2690
2691 static void con_flush_chars(struct tty_struct *tty)
2692 {
2693 struct vc_data *vc;
2694
2695 if (in_interrupt()) /* from flush_to_ldisc */
2696 return;
2697
2698 /* if we race with con_close(), vt may be null */
2699 acquire_console_sem();
2700 vc = tty->driver_data;
2701 if (vc)
2702 set_cursor(vc);
2703 release_console_sem();
2704 }
2705
2706 /*
2707 * Allocate the console screen memory.
2708 */
2709 static int con_open(struct tty_struct *tty, struct file *filp)
2710 {
2711 unsigned int currcons = tty->index;
2712 int ret = 0;
2713
2714 acquire_console_sem();
2715 if (tty->driver_data == NULL) {
2716 ret = vc_allocate(currcons);
2717 if (ret == 0) {
2718 struct vc_data *vc = vc_cons[currcons].d;
2719 tty->driver_data = vc;
2720 vc->vc_tty = tty;
2721
2722 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2723 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2724 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2725 }
2726 if (vc->vc_utf)
2727 tty->termios->c_iflag |= IUTF8;
2728 else
2729 tty->termios->c_iflag &= ~IUTF8;
2730 release_console_sem();
2731 vcs_make_sysfs(tty);
2732 return ret;
2733 }
2734 }
2735 release_console_sem();
2736 return ret;
2737 }
2738
2739 /*
2740 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2741 * and taking a ref against the tty while we're in the process of forgetting
2742 * about it and cleaning things up.
2743 *
2744 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2745 */
2746 static void con_close(struct tty_struct *tty, struct file *filp)
2747 {
2748 mutex_lock(&tty_mutex);
2749 acquire_console_sem();
2750 if (tty && tty->count == 1) {
2751 struct vc_data *vc = tty->driver_data;
2752
2753 if (vc)
2754 vc->vc_tty = NULL;
2755 tty->driver_data = NULL;
2756 release_console_sem();
2757 vcs_remove_sysfs(tty);
2758 mutex_unlock(&tty_mutex);
2759 /*
2760 * tty_mutex is released, but we still hold BKL, so there is
2761 * still exclusion against init_dev()
2762 */
2763 return;
2764 }
2765 release_console_sem();
2766 mutex_unlock(&tty_mutex);
2767 }
2768
2769 static int default_italic_color = 2; // green (ASCII)
2770 static int default_underline_color = 3; // cyan (ASCII)
2771 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2772 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2773
2774 static void vc_init(struct vc_data *vc, unsigned int rows,
2775 unsigned int cols, int do_clear)
2776 {
2777 int j, k ;
2778
2779 vc->vc_cols = cols;
2780 vc->vc_rows = rows;
2781 vc->vc_size_row = cols << 1;
2782 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2783
2784 set_origin(vc);
2785 vc->vc_pos = vc->vc_origin;
2786 reset_vc(vc);
2787 for (j=k=0; j<16; j++) {
2788 vc->vc_palette[k++] = default_red[j] ;
2789 vc->vc_palette[k++] = default_grn[j] ;
2790 vc->vc_palette[k++] = default_blu[j] ;
2791 }
2792 vc->vc_def_color = 0x07; /* white */
2793 vc->vc_ulcolor = default_underline_color;
2794 vc->vc_itcolor = default_italic_color;
2795 vc->vc_halfcolor = 0x08; /* grey */
2796 init_waitqueue_head(&vc->paste_wait);
2797 reset_terminal(vc, do_clear);
2798 }
2799
2800 /*
2801 * This routine initializes console interrupts, and does nothing
2802 * else. If you want the screen to clear, call tty_write with
2803 * the appropriate escape-sequence.
2804 */
2805
2806 static int __init con_init(void)
2807 {
2808 const char *display_desc = NULL;
2809 struct vc_data *vc;
2810 unsigned int currcons = 0, i;
2811
2812 acquire_console_sem();
2813
2814 if (conswitchp)
2815 display_desc = conswitchp->con_startup();
2816 if (!display_desc) {
2817 fg_console = 0;
2818 release_console_sem();
2819 return 0;
2820 }
2821
2822 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2823 struct con_driver *con_driver = &registered_con_driver[i];
2824
2825 if (con_driver->con == NULL) {
2826 con_driver->con = conswitchp;
2827 con_driver->desc = display_desc;
2828 con_driver->flag = CON_DRIVER_FLAG_INIT;
2829 con_driver->first = 0;
2830 con_driver->last = MAX_NR_CONSOLES - 1;
2831 break;
2832 }
2833 }
2834
2835 for (i = 0; i < MAX_NR_CONSOLES; i++)
2836 con_driver_map[i] = conswitchp;
2837
2838 if (blankinterval) {
2839 blank_state = blank_normal_wait;
2840 mod_timer(&console_timer, jiffies + blankinterval);
2841 }
2842
2843 /*
2844 * kmalloc is not running yet - we use the bootmem allocator.
2845 */
2846 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2847 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2848 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2849 visual_init(vc, currcons, 1);
2850 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2851 vc->vc_kmalloced = 0;
2852 vc_init(vc, vc->vc_rows, vc->vc_cols,
2853 currcons || !vc->vc_sw->con_save_screen);
2854 }
2855 currcons = fg_console = 0;
2856 master_display_fg = vc = vc_cons[currcons].d;
2857 set_origin(vc);
2858 save_screen(vc);
2859 gotoxy(vc, vc->vc_x, vc->vc_y);
2860 csi_J(vc, 0);
2861 update_screen(vc);
2862 printk("Console: %s %s %dx%d",
2863 vc->vc_can_do_color ? "colour" : "mono",
2864 display_desc, vc->vc_cols, vc->vc_rows);
2865 printable = 1;
2866 printk("\n");
2867
2868 release_console_sem();
2869
2870 #ifdef CONFIG_VT_CONSOLE
2871 register_console(&vt_console_driver);
2872 #endif
2873 return 0;
2874 }
2875 console_initcall(con_init);
2876
2877 static const struct tty_operations con_ops = {
2878 .open = con_open,
2879 .close = con_close,
2880 .write = con_write,
2881 .write_room = con_write_room,
2882 .put_char = con_put_char,
2883 .flush_chars = con_flush_chars,
2884 .chars_in_buffer = con_chars_in_buffer,
2885 .ioctl = vt_ioctl,
2886 .stop = con_stop,
2887 .start = con_start,
2888 .throttle = con_throttle,
2889 .unthrottle = con_unthrottle,
2890 };
2891
2892 int __init vty_init(void)
2893 {
2894 vcs_init();
2895
2896 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2897 if (!console_driver)
2898 panic("Couldn't allocate console driver\n");
2899 console_driver->owner = THIS_MODULE;
2900 console_driver->name = "tty";
2901 console_driver->name_base = 1;
2902 console_driver->major = TTY_MAJOR;
2903 console_driver->minor_start = 1;
2904 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2905 console_driver->init_termios = tty_std_termios;
2906 if (default_utf8)
2907 console_driver->init_termios.c_iflag |= IUTF8;
2908 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2909 tty_set_operations(console_driver, &con_ops);
2910 if (tty_register_driver(console_driver))
2911 panic("Couldn't register console driver\n");
2912
2913 kbd_init();
2914 console_map_init();
2915 #ifdef CONFIG_PROM_CONSOLE
2916 prom_con_init();
2917 #endif
2918 #ifdef CONFIG_MDA_CONSOLE
2919 mda_console_init();
2920 #endif
2921 return 0;
2922 }
2923
2924 #ifndef VT_SINGLE_DRIVER
2925 #include <linux/device.h>
2926
2927 static struct class *vtconsole_class;
2928
2929 static int bind_con_driver(const struct consw *csw, int first, int last,
2930 int deflt)
2931 {
2932 struct module *owner = csw->owner;
2933 const char *desc = NULL;
2934 struct con_driver *con_driver;
2935 int i, j = -1, k = -1, retval = -ENODEV;
2936
2937 if (!try_module_get(owner))
2938 return -ENODEV;
2939
2940 acquire_console_sem();
2941
2942 /* check if driver is registered */
2943 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2944 con_driver = &registered_con_driver[i];
2945
2946 if (con_driver->con == csw) {
2947 desc = con_driver->desc;
2948 retval = 0;
2949 break;
2950 }
2951 }
2952
2953 if (retval)
2954 goto err;
2955
2956 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2957 csw->con_startup();
2958 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2959 }
2960
2961 if (deflt) {
2962 if (conswitchp)
2963 module_put(conswitchp->owner);
2964
2965 __module_get(owner);
2966 conswitchp = csw;
2967 }
2968
2969 first = max(first, con_driver->first);
2970 last = min(last, con_driver->last);
2971
2972 for (i = first; i <= last; i++) {
2973 int old_was_color;
2974 struct vc_data *vc = vc_cons[i].d;
2975
2976 if (con_driver_map[i])
2977 module_put(con_driver_map[i]->owner);
2978 __module_get(owner);
2979 con_driver_map[i] = csw;
2980
2981 if (!vc || !vc->vc_sw)
2982 continue;
2983
2984 j = i;
2985
2986 if (CON_IS_VISIBLE(vc)) {
2987 k = i;
2988 save_screen(vc);
2989 }
2990
2991 old_was_color = vc->vc_can_do_color;
2992 vc->vc_sw->con_deinit(vc);
2993 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2994 visual_init(vc, i, 0);
2995 set_origin(vc);
2996 update_attr(vc);
2997
2998 /* If the console changed between mono <-> color, then
2999 * the attributes in the screenbuf will be wrong. The
3000 * following resets all attributes to something sane.
3001 */
3002 if (old_was_color != vc->vc_can_do_color)
3003 clear_buffer_attributes(vc);
3004 }
3005
3006 printk("Console: switching ");
3007 if (!deflt)
3008 printk("consoles %d-%d ", first+1, last+1);
3009 if (j >= 0) {
3010 struct vc_data *vc = vc_cons[j].d;
3011
3012 printk("to %s %s %dx%d\n",
3013 vc->vc_can_do_color ? "colour" : "mono",
3014 desc, vc->vc_cols, vc->vc_rows);
3015
3016 if (k >= 0) {
3017 vc = vc_cons[k].d;
3018 update_screen(vc);
3019 }
3020 } else
3021 printk("to %s\n", desc);
3022
3023 retval = 0;
3024 err:
3025 release_console_sem();
3026 module_put(owner);
3027 return retval;
3028 };
3029
3030 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3031 static int con_is_graphics(const struct consw *csw, int first, int last)
3032 {
3033 int i, retval = 0;
3034
3035 for (i = first; i <= last; i++) {
3036 struct vc_data *vc = vc_cons[i].d;
3037
3038 if (vc && vc->vc_mode == KD_GRAPHICS) {
3039 retval = 1;
3040 break;
3041 }
3042 }
3043
3044 return retval;
3045 }
3046
3047 /**
3048 * unbind_con_driver - unbind a console driver
3049 * @csw: pointer to console driver to unregister
3050 * @first: first in range of consoles that @csw should be unbound from
3051 * @last: last in range of consoles that @csw should be unbound from
3052 * @deflt: should next bound console driver be default after @csw is unbound?
3053 *
3054 * To unbind a driver from all possible consoles, pass 0 as @first and
3055 * %MAX_NR_CONSOLES as @last.
3056 *
3057 * @deflt controls whether the console that ends up replacing @csw should be
3058 * the default console.
3059 *
3060 * RETURNS:
3061 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3062 * or 0 on success.
3063 */
3064 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3065 {
3066 struct module *owner = csw->owner;
3067 const struct consw *defcsw = NULL;
3068 struct con_driver *con_driver = NULL, *con_back = NULL;
3069 int i, retval = -ENODEV;
3070
3071 if (!try_module_get(owner))
3072 return -ENODEV;
3073
3074 acquire_console_sem();
3075
3076 /* check if driver is registered and if it is unbindable */
3077 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3078 con_driver = &registered_con_driver[i];
3079
3080 if (con_driver->con == csw &&
3081 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3082 retval = 0;
3083 break;
3084 }
3085 }
3086
3087 if (retval) {
3088 release_console_sem();
3089 goto err;
3090 }
3091
3092 retval = -ENODEV;
3093
3094 /* check if backup driver exists */
3095 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3096 con_back = &registered_con_driver[i];
3097
3098 if (con_back->con &&
3099 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3100 defcsw = con_back->con;
3101 retval = 0;
3102 break;
3103 }
3104 }
3105
3106 if (retval) {
3107 release_console_sem();
3108 goto err;
3109 }
3110
3111 if (!con_is_bound(csw)) {
3112 release_console_sem();
3113 goto err;
3114 }
3115
3116 first = max(first, con_driver->first);
3117 last = min(last, con_driver->last);
3118
3119 for (i = first; i <= last; i++) {
3120 if (con_driver_map[i] == csw) {
3121 module_put(csw->owner);
3122 con_driver_map[i] = NULL;
3123 }
3124 }
3125
3126 if (!con_is_bound(defcsw)) {
3127 const struct consw *defconsw = conswitchp;
3128
3129 defcsw->con_startup();
3130 con_back->flag |= CON_DRIVER_FLAG_INIT;
3131 /*
3132 * vgacon may change the default driver to point
3133 * to dummycon, we restore it here...
3134 */
3135 conswitchp = defconsw;
3136 }
3137
3138 if (!con_is_bound(csw))
3139 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3140
3141 release_console_sem();
3142 /* ignore return value, binding should not fail */
3143 bind_con_driver(defcsw, first, last, deflt);
3144 err:
3145 module_put(owner);
3146 return retval;
3147
3148 }
3149 EXPORT_SYMBOL(unbind_con_driver);
3150
3151 static int vt_bind(struct con_driver *con)
3152 {
3153 const struct consw *defcsw = NULL, *csw = NULL;
3154 int i, more = 1, first = -1, last = -1, deflt = 0;
3155
3156 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3157 con_is_graphics(con->con, con->first, con->last))
3158 goto err;
3159
3160 csw = con->con;
3161
3162 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3163 struct con_driver *con = &registered_con_driver[i];
3164
3165 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3166 defcsw = con->con;
3167 break;
3168 }
3169 }
3170
3171 if (!defcsw)
3172 goto err;
3173
3174 while (more) {
3175 more = 0;
3176
3177 for (i = con->first; i <= con->last; i++) {
3178 if (con_driver_map[i] == defcsw) {
3179 if (first == -1)
3180 first = i;
3181 last = i;
3182 more = 1;
3183 } else if (first != -1)
3184 break;
3185 }
3186
3187 if (first == 0 && last == MAX_NR_CONSOLES -1)
3188 deflt = 1;
3189
3190 if (first != -1)
3191 bind_con_driver(csw, first, last, deflt);
3192
3193 first = -1;
3194 last = -1;
3195 deflt = 0;
3196 }
3197
3198 err:
3199 return 0;
3200 }
3201
3202 static int vt_unbind(struct con_driver *con)
3203 {
3204 const struct consw *csw = NULL;
3205 int i, more = 1, first = -1, last = -1, deflt = 0;
3206
3207 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3208 con_is_graphics(con->con, con->first, con->last))
3209 goto err;
3210
3211 csw = con->con;
3212
3213 while (more) {
3214 more = 0;
3215
3216 for (i = con->first; i <= con->last; i++) {
3217 if (con_driver_map[i] == csw) {
3218 if (first == -1)
3219 first = i;
3220 last = i;
3221 more = 1;
3222 } else if (first != -1)
3223 break;
3224 }
3225
3226 if (first == 0 && last == MAX_NR_CONSOLES -1)
3227 deflt = 1;
3228
3229 if (first != -1)
3230 unbind_con_driver(csw, first, last, deflt);
3231
3232 first = -1;
3233 last = -1;
3234 deflt = 0;
3235 }
3236
3237 err:
3238 return 0;
3239 }
3240 #else
3241 static inline int vt_bind(struct con_driver *con)
3242 {
3243 return 0;
3244 }
3245 static inline int vt_unbind(struct con_driver *con)
3246 {
3247 return 0;
3248 }
3249 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3250
3251 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3252 const char *buf, size_t count)
3253 {
3254 struct con_driver *con = dev_get_drvdata(dev);
3255 int bind = simple_strtoul(buf, NULL, 0);
3256
3257 if (bind)
3258 vt_bind(con);
3259 else
3260 vt_unbind(con);
3261
3262 return count;
3263 }
3264
3265 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3266 char *buf)
3267 {
3268 struct con_driver *con = dev_get_drvdata(dev);
3269 int bind = con_is_bound(con->con);
3270
3271 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3272 }
3273
3274 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3275 char *buf)
3276 {
3277 struct con_driver *con = dev_get_drvdata(dev);
3278
3279 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3280 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3281 con->desc);
3282
3283 }
3284
3285 static struct device_attribute device_attrs[] = {
3286 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3287 __ATTR(name, S_IRUGO, show_name, NULL),
3288 };
3289
3290 static int vtconsole_init_device(struct con_driver *con)
3291 {
3292 int i;
3293 int error = 0;
3294
3295 con->flag |= CON_DRIVER_FLAG_ATTR;
3296 dev_set_drvdata(con->dev, con);
3297 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3298 error = device_create_file(con->dev, &device_attrs[i]);
3299 if (error)
3300 break;
3301 }
3302
3303 if (error) {
3304 while (--i >= 0)
3305 device_remove_file(con->dev, &device_attrs[i]);
3306 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3307 }
3308
3309 return error;
3310 }
3311
3312 static void vtconsole_deinit_device(struct con_driver *con)
3313 {
3314 int i;
3315
3316 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3317 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3318 device_remove_file(con->dev, &device_attrs[i]);
3319 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3320 }
3321 }
3322
3323 /**
3324 * con_is_bound - checks if driver is bound to the console
3325 * @csw: console driver
3326 *
3327 * RETURNS: zero if unbound, nonzero if bound
3328 *
3329 * Drivers can call this and if zero, they should release
3330 * all resources allocated on con_startup()
3331 */
3332 int con_is_bound(const struct consw *csw)
3333 {
3334 int i, bound = 0;
3335
3336 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3337 if (con_driver_map[i] == csw) {
3338 bound = 1;
3339 break;
3340 }
3341 }
3342
3343 return bound;
3344 }
3345 EXPORT_SYMBOL(con_is_bound);
3346
3347 /**
3348 * register_con_driver - register console driver to console layer
3349 * @csw: console driver
3350 * @first: the first console to take over, minimum value is 0
3351 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3352 *
3353 * DESCRIPTION: This function registers a console driver which can later
3354 * bind to a range of consoles specified by @first and @last. It will
3355 * also initialize the console driver by calling con_startup().
3356 */
3357 int register_con_driver(const struct consw *csw, int first, int last)
3358 {
3359 struct module *owner = csw->owner;
3360 struct con_driver *con_driver;
3361 const char *desc;
3362 int i, retval = 0;
3363
3364 if (!try_module_get(owner))
3365 return -ENODEV;
3366
3367 acquire_console_sem();
3368
3369 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3370 con_driver = &registered_con_driver[i];
3371
3372 /* already registered */
3373 if (con_driver->con == csw)
3374 retval = -EINVAL;
3375 }
3376
3377 if (retval)
3378 goto err;
3379
3380 desc = csw->con_startup();
3381
3382 if (!desc)
3383 goto err;
3384
3385 retval = -EINVAL;
3386
3387 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3388 con_driver = &registered_con_driver[i];
3389
3390 if (con_driver->con == NULL) {
3391 con_driver->con = csw;
3392 con_driver->desc = desc;
3393 con_driver->node = i;
3394 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3395 CON_DRIVER_FLAG_INIT;
3396 con_driver->first = first;
3397 con_driver->last = last;
3398 retval = 0;
3399 break;
3400 }
3401 }
3402
3403 if (retval)
3404 goto err;
3405
3406 con_driver->dev = device_create(vtconsole_class, NULL,
3407 MKDEV(0, con_driver->node),
3408 "vtcon%i", con_driver->node);
3409
3410 if (IS_ERR(con_driver->dev)) {
3411 printk(KERN_WARNING "Unable to create device for %s; "
3412 "errno = %ld\n", con_driver->desc,
3413 PTR_ERR(con_driver->dev));
3414 con_driver->dev = NULL;
3415 } else {
3416 vtconsole_init_device(con_driver);
3417 }
3418
3419 err:
3420 release_console_sem();
3421 module_put(owner);
3422 return retval;
3423 }
3424 EXPORT_SYMBOL(register_con_driver);
3425
3426 /**
3427 * unregister_con_driver - unregister console driver from console layer
3428 * @csw: console driver
3429 *
3430 * DESCRIPTION: All drivers that registers to the console layer must
3431 * call this function upon exit, or if the console driver is in a state
3432 * where it won't be able to handle console services, such as the
3433 * framebuffer console without loaded framebuffer drivers.
3434 *
3435 * The driver must unbind first prior to unregistration.
3436 */
3437 int unregister_con_driver(const struct consw *csw)
3438 {
3439 int i, retval = -ENODEV;
3440
3441 acquire_console_sem();
3442
3443 /* cannot unregister a bound driver */
3444 if (con_is_bound(csw))
3445 goto err;
3446
3447 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3448 struct con_driver *con_driver = &registered_con_driver[i];
3449
3450 if (con_driver->con == csw &&
3451 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3452 vtconsole_deinit_device(con_driver);
3453 device_destroy(vtconsole_class,
3454 MKDEV(0, con_driver->node));
3455 con_driver->con = NULL;
3456 con_driver->desc = NULL;
3457 con_driver->dev = NULL;
3458 con_driver->node = 0;
3459 con_driver->flag = 0;
3460 con_driver->first = 0;
3461 con_driver->last = 0;
3462 retval = 0;
3463 break;
3464 }
3465 }
3466 err:
3467 release_console_sem();
3468 return retval;
3469 }
3470 EXPORT_SYMBOL(unregister_con_driver);
3471
3472 /*
3473 * If we support more console drivers, this function is used
3474 * when a driver wants to take over some existing consoles
3475 * and become default driver for newly opened ones.
3476 *
3477 * take_over_console is basically a register followed by unbind
3478 */
3479 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3480 {
3481 int err;
3482
3483 err = register_con_driver(csw, first, last);
3484
3485 if (!err)
3486 bind_con_driver(csw, first, last, deflt);
3487
3488 return err;
3489 }
3490
3491 /*
3492 * give_up_console is a wrapper to unregister_con_driver. It will only
3493 * work if driver is fully unbound.
3494 */
3495 void give_up_console(const struct consw *csw)
3496 {
3497 unregister_con_driver(csw);
3498 }
3499
3500 static int __init vtconsole_class_init(void)
3501 {
3502 int i;
3503
3504 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3505 if (IS_ERR(vtconsole_class)) {
3506 printk(KERN_WARNING "Unable to create vt console class; "
3507 "errno = %ld\n", PTR_ERR(vtconsole_class));
3508 vtconsole_class = NULL;
3509 }
3510
3511 /* Add system drivers to sysfs */
3512 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3513 struct con_driver *con = &registered_con_driver[i];
3514
3515 if (con->con && !con->dev) {
3516 con->dev = device_create(vtconsole_class, NULL,
3517 MKDEV(0, con->node),
3518 "vtcon%i", con->node);
3519
3520 if (IS_ERR(con->dev)) {
3521 printk(KERN_WARNING "Unable to create "
3522 "device for %s; errno = %ld\n",
3523 con->desc, PTR_ERR(con->dev));
3524 con->dev = NULL;
3525 } else {
3526 vtconsole_init_device(con);
3527 }
3528 }
3529 }
3530
3531 return 0;
3532 }
3533 postcore_initcall(vtconsole_class_init);
3534
3535 #endif
3536
3537 /*
3538 * Screen blanking
3539 */
3540
3541 static int set_vesa_blanking(char __user *p)
3542 {
3543 unsigned int mode;
3544
3545 if (get_user(mode, p + 1))
3546 return -EFAULT;
3547
3548 vesa_blank_mode = (mode < 4) ? mode : 0;
3549 return 0;
3550 }
3551
3552 void do_blank_screen(int entering_gfx)
3553 {
3554 struct vc_data *vc = vc_cons[fg_console].d;
3555 int i;
3556
3557 WARN_CONSOLE_UNLOCKED();
3558
3559 if (console_blanked) {
3560 if (blank_state == blank_vesa_wait) {
3561 blank_state = blank_off;
3562 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3563 }
3564 return;
3565 }
3566
3567 /* entering graphics mode? */
3568 if (entering_gfx) {
3569 hide_cursor(vc);
3570 save_screen(vc);
3571 vc->vc_sw->con_blank(vc, -1, 1);
3572 console_blanked = fg_console + 1;
3573 blank_state = blank_off;
3574 set_origin(vc);
3575 return;
3576 }
3577
3578 if (blank_state != blank_normal_wait)
3579 return;
3580 blank_state = blank_off;
3581
3582 /* don't blank graphics */
3583 if (vc->vc_mode != KD_TEXT) {
3584 console_blanked = fg_console + 1;
3585 return;
3586 }
3587
3588 hide_cursor(vc);
3589 del_timer_sync(&console_timer);
3590 blank_timer_expired = 0;
3591
3592 save_screen(vc);
3593 /* In case we need to reset origin, blanking hook returns 1 */
3594 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3595 console_blanked = fg_console + 1;
3596 if (i)
3597 set_origin(vc);
3598
3599 if (console_blank_hook && console_blank_hook(1))
3600 return;
3601
3602 if (vesa_off_interval && vesa_blank_mode) {
3603 blank_state = blank_vesa_wait;
3604 mod_timer(&console_timer, jiffies + vesa_off_interval);
3605 }
3606 }
3607 EXPORT_SYMBOL(do_blank_screen);
3608
3609 /*
3610 * Called by timer as well as from vt_console_driver
3611 */
3612 void do_unblank_screen(int leaving_gfx)
3613 {
3614 struct vc_data *vc;
3615
3616 /* This should now always be called from a "sane" (read: can schedule)
3617 * context for the sake of the low level drivers, except in the special
3618 * case of oops_in_progress
3619 */
3620 if (!oops_in_progress)
3621 might_sleep();
3622
3623 WARN_CONSOLE_UNLOCKED();
3624
3625 ignore_poke = 0;
3626 if (!console_blanked)
3627 return;
3628 if (!vc_cons_allocated(fg_console)) {
3629 /* impossible */
3630 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3631 return;
3632 }
3633 vc = vc_cons[fg_console].d;
3634 if (vc->vc_mode != KD_TEXT)
3635 return; /* but leave console_blanked != 0 */
3636
3637 if (blankinterval) {
3638 mod_timer(&console_timer, jiffies + blankinterval);
3639 blank_state = blank_normal_wait;
3640 }
3641
3642 console_blanked = 0;
3643 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3644 /* Low-level driver cannot restore -> do it ourselves */
3645 update_screen(vc);
3646 if (console_blank_hook)
3647 console_blank_hook(0);
3648 set_palette(vc);
3649 set_cursor(vc);
3650 }
3651 EXPORT_SYMBOL(do_unblank_screen);
3652
3653 /*
3654 * This is called by the outside world to cause a forced unblank, mostly for
3655 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3656 * call it with 1 as an argument and so force a mode restore... that may kill
3657 * X or at least garbage the screen but would also make the Oops visible...
3658 */
3659 void unblank_screen(void)
3660 {
3661 do_unblank_screen(0);
3662 }
3663
3664 /*
3665 * We defer the timer blanking to work queue so it can take the console mutex
3666 * (console operations can still happen at irq time, but only from printk which
3667 * has the console mutex. Not perfect yet, but better than no locking
3668 */
3669 static void blank_screen_t(unsigned long dummy)
3670 {
3671 if (unlikely(!keventd_up())) {
3672 mod_timer(&console_timer, jiffies + blankinterval);
3673 return;
3674 }
3675 blank_timer_expired = 1;
3676 schedule_work(&console_work);
3677 }
3678
3679 void poke_blanked_console(void)
3680 {
3681 WARN_CONSOLE_UNLOCKED();
3682
3683 /* Add this so we quickly catch whoever might call us in a non
3684 * safe context. Nowadays, unblank_screen() isn't to be called in
3685 * atomic contexts and is allowed to schedule (with the special case
3686 * of oops_in_progress, but that isn't of any concern for this
3687 * function. --BenH.
3688 */
3689 might_sleep();
3690
3691 /* This isn't perfectly race free, but a race here would be mostly harmless,
3692 * at worse, we'll do a spurrious blank and it's unlikely
3693 */
3694 del_timer(&console_timer);
3695 blank_timer_expired = 0;
3696
3697 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3698 return;
3699 if (console_blanked)
3700 unblank_screen();
3701 else if (blankinterval) {
3702 mod_timer(&console_timer, jiffies + blankinterval);
3703 blank_state = blank_normal_wait;
3704 }
3705 }
3706
3707 /*
3708 * Palettes
3709 */
3710
3711 static void set_palette(struct vc_data *vc)
3712 {
3713 WARN_CONSOLE_UNLOCKED();
3714
3715 if (vc->vc_mode != KD_GRAPHICS)
3716 vc->vc_sw->con_set_palette(vc, color_table);
3717 }
3718
3719 static int set_get_cmap(unsigned char __user *arg, int set)
3720 {
3721 int i, j, k;
3722
3723 WARN_CONSOLE_UNLOCKED();
3724
3725 for (i = 0; i < 16; i++)
3726 if (set) {
3727 get_user(default_red[i], arg++);
3728 get_user(default_grn[i], arg++);
3729 get_user(default_blu[i], arg++);
3730 } else {
3731 put_user(default_red[i], arg++);
3732 put_user(default_grn[i], arg++);
3733 put_user(default_blu[i], arg++);
3734 }
3735 if (set) {
3736 for (i = 0; i < MAX_NR_CONSOLES; i++)
3737 if (vc_cons_allocated(i)) {
3738 for (j = k = 0; j < 16; j++) {
3739 vc_cons[i].d->vc_palette[k++] = default_red[j];
3740 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3741 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3742 }
3743 set_palette(vc_cons[i].d);
3744 }
3745 }
3746 return 0;
3747 }
3748
3749 /*
3750 * Load palette into the DAC registers. arg points to a colour
3751 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3752 */
3753
3754 int con_set_cmap(unsigned char __user *arg)
3755 {
3756 int rc;
3757
3758 acquire_console_sem();
3759 rc = set_get_cmap (arg,1);
3760 release_console_sem();
3761
3762 return rc;
3763 }
3764
3765 int con_get_cmap(unsigned char __user *arg)
3766 {
3767 int rc;
3768
3769 acquire_console_sem();
3770 rc = set_get_cmap (arg,0);
3771 release_console_sem();
3772
3773 return rc;
3774 }
3775
3776 void reset_palette(struct vc_data *vc)
3777 {
3778 int j, k;
3779 for (j=k=0; j<16; j++) {
3780 vc->vc_palette[k++] = default_red[j];
3781 vc->vc_palette[k++] = default_grn[j];
3782 vc->vc_palette[k++] = default_blu[j];
3783 }
3784 set_palette(vc);
3785 }
3786
3787 /*
3788 * Font switching
3789 *
3790 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3791 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3792 * depending on width) reserved for each character which is kinda wasty, but
3793 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3794 * is upto the actual low-level console-driver convert data into its favorite
3795 * format (maybe we should add a `fontoffset' field to the `display'
3796 * structure so we won't have to convert the fontdata all the time.
3797 * /Jes
3798 */
3799
3800 #define max_font_size 65536
3801
3802 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3803 {
3804 struct console_font font;
3805 int rc = -EINVAL;
3806 int c;
3807
3808 if (vc->vc_mode != KD_TEXT)
3809 return -EINVAL;
3810
3811 if (op->data) {
3812 font.data = kmalloc(max_font_size, GFP_KERNEL);
3813 if (!font.data)
3814 return -ENOMEM;
3815 } else
3816 font.data = NULL;
3817
3818 acquire_console_sem();
3819 if (vc->vc_sw->con_font_get)
3820 rc = vc->vc_sw->con_font_get(vc, &font);
3821 else
3822 rc = -ENOSYS;
3823 release_console_sem();
3824
3825 if (rc)
3826 goto out;
3827
3828 c = (font.width+7)/8 * 32 * font.charcount;
3829
3830 if (op->data && font.charcount > op->charcount)
3831 rc = -ENOSPC;
3832 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3833 if (font.width > op->width || font.height > op->height)
3834 rc = -ENOSPC;
3835 } else {
3836 if (font.width != 8)
3837 rc = -EIO;
3838 else if ((op->height && font.height > op->height) ||
3839 font.height > 32)
3840 rc = -ENOSPC;
3841 }
3842 if (rc)
3843 goto out;
3844
3845 op->height = font.height;
3846 op->width = font.width;
3847 op->charcount = font.charcount;
3848
3849 if (op->data && copy_to_user(op->data, font.data, c))
3850 rc = -EFAULT;
3851
3852 out:
3853 kfree(font.data);
3854 return rc;
3855 }
3856
3857 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3858 {
3859 struct console_font font;
3860 int rc = -EINVAL;
3861 int size;
3862
3863 if (vc->vc_mode != KD_TEXT)
3864 return -EINVAL;
3865 if (!op->data)
3866 return -EINVAL;
3867 if (op->charcount > 512)
3868 return -EINVAL;
3869 if (!op->height) { /* Need to guess font height [compat] */
3870 int h, i;
3871 u8 __user *charmap = op->data;
3872 u8 tmp;
3873
3874 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3875 so that we can get rid of this soon */
3876 if (!(op->flags & KD_FONT_FLAG_OLD))
3877 return -EINVAL;
3878 for (h = 32; h > 0; h--)
3879 for (i = 0; i < op->charcount; i++) {
3880 if (get_user(tmp, &charmap[32*i+h-1]))
3881 return -EFAULT;
3882 if (tmp)
3883 goto nonzero;
3884 }
3885 return -EINVAL;
3886 nonzero:
3887 op->height = h;
3888 }
3889 if (op->width <= 0 || op->width > 32 || op->height > 32)
3890 return -EINVAL;
3891 size = (op->width+7)/8 * 32 * op->charcount;
3892 if (size > max_font_size)
3893 return -ENOSPC;
3894 font.charcount = op->charcount;
3895 font.height = op->height;
3896 font.width = op->width;
3897 font.data = kmalloc(size, GFP_KERNEL);
3898 if (!font.data)
3899 return -ENOMEM;
3900 if (copy_from_user(font.data, op->data, size)) {
3901 kfree(font.data);
3902 return -EFAULT;
3903 }
3904 acquire_console_sem();
3905 if (vc->vc_sw->con_font_set)
3906 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3907 else
3908 rc = -ENOSYS;
3909 release_console_sem();
3910 kfree(font.data);
3911 return rc;
3912 }
3913
3914 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3915 {
3916 struct console_font font = {.width = op->width, .height = op->height};
3917 char name[MAX_FONT_NAME];
3918 char *s = name;
3919 int rc;
3920
3921 if (vc->vc_mode != KD_TEXT)
3922 return -EINVAL;
3923
3924 if (!op->data)
3925 s = NULL;
3926 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3927 return -EFAULT;
3928 else
3929 name[MAX_FONT_NAME - 1] = 0;
3930
3931 acquire_console_sem();
3932 if (vc->vc_sw->con_font_default)
3933 rc = vc->vc_sw->con_font_default(vc, &font, s);
3934 else
3935 rc = -ENOSYS;
3936 release_console_sem();
3937 if (!rc) {
3938 op->width = font.width;
3939 op->height = font.height;
3940 }
3941 return rc;
3942 }
3943
3944 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3945 {
3946 int con = op->height;
3947 int rc;
3948
3949 if (vc->vc_mode != KD_TEXT)
3950 return -EINVAL;
3951
3952 acquire_console_sem();
3953 if (!vc->vc_sw->con_font_copy)
3954 rc = -ENOSYS;
3955 else if (con < 0 || !vc_cons_allocated(con))
3956 rc = -ENOTTY;
3957 else if (con == vc->vc_num) /* nothing to do */
3958 rc = 0;
3959 else
3960 rc = vc->vc_sw->con_font_copy(vc, con);
3961 release_console_sem();
3962 return rc;
3963 }
3964
3965 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3966 {
3967 switch (op->op) {
3968 case KD_FONT_OP_SET:
3969 return con_font_set(vc, op);
3970 case KD_FONT_OP_GET:
3971 return con_font_get(vc, op);
3972 case KD_FONT_OP_SET_DEFAULT:
3973 return con_font_default(vc, op);
3974 case KD_FONT_OP_COPY:
3975 return con_font_copy(vc, op);
3976 }
3977 return -ENOSYS;
3978 }
3979
3980 /*
3981 * Interface exported to selection and vcs.
3982 */
3983
3984 /* used by selection */
3985 u16 screen_glyph(struct vc_data *vc, int offset)
3986 {
3987 u16 w = scr_readw(screenpos(vc, offset, 1));
3988 u16 c = w & 0xff;
3989
3990 if (w & vc->vc_hi_font_mask)
3991 c |= 0x100;
3992 return c;
3993 }
3994
3995 /* used by vcs - note the word offset */
3996 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3997 {
3998 return screenpos(vc, 2 * w_offset, viewed);
3999 }
4000
4001 void getconsxy(struct vc_data *vc, unsigned char *p)
4002 {
4003 p[0] = vc->vc_x;
4004 p[1] = vc->vc_y;
4005 }
4006
4007 void putconsxy(struct vc_data *vc, unsigned char *p)
4008 {
4009 hide_cursor(vc);
4010 gotoxy(vc, p[0], p[1]);
4011 set_cursor(vc);
4012 }
4013
4014 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4015 {
4016 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4017 return softcursor_original;
4018 return scr_readw(org);
4019 }
4020
4021 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4022 {
4023 scr_writew(val, org);
4024 if ((unsigned long)org == vc->vc_pos) {
4025 softcursor_original = -1;
4026 add_softcursor(vc);
4027 }
4028 }
4029
4030 /*
4031 * Visible symbols for modules
4032 */
4033
4034 EXPORT_SYMBOL(color_table);
4035 EXPORT_SYMBOL(default_red);
4036 EXPORT_SYMBOL(default_grn);
4037 EXPORT_SYMBOL(default_blu);
4038 EXPORT_SYMBOL(update_region);
4039 EXPORT_SYMBOL(redraw_screen);
4040 EXPORT_SYMBOL(vc_resize);
4041 EXPORT_SYMBOL(vc_lock_resize);
4042 EXPORT_SYMBOL(fg_console);
4043 EXPORT_SYMBOL(console_blank_hook);
4044 EXPORT_SYMBOL(console_blanked);
4045 EXPORT_SYMBOL(vc_cons);
4046 #ifndef VT_SINGLE_DRIVER
4047 EXPORT_SYMBOL(take_over_console);
4048 EXPORT_SYMBOL(give_up_console);
4049 #endif
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