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mm-only debug patch...
[mmotm.git] / drivers / char / vt.c
blob197fec5abda04cffa9564c2fdf9501d593b679ac
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/smp_lock.h>
93 #include <linux/tiocl.h>
94 #include <linux/kbd_kern.h>
95 #include <linux/consolemap.h>
96 #include <linux/timer.h>
97 #include <linux/interrupt.h>
98 #include <linux/workqueue.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103 #include <linux/device.h>
104 #include <linux/io.h>
105 #include <asm/system.h>
106 #include <linux/uaccess.h>
107
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 vesa_off_interval;
176 static int blankinterval = 10*60;
177 core_param(consoleblank, blankinterval, int, 0444);
178
179 static DECLARE_WORK(console_work, console_callback);
180
181 /*
182 * fg_console is the current virtual console,
183 * last_console is the last used one,
184 * want_console is the console we want to switch to,
185 */
186 int fg_console;
187 int last_console;
188 int want_console = -1;
189
190 /*
191 * For each existing display, we have a pointer to console currently visible
192 * on that display, allowing consoles other than fg_console to be refreshed
193 * appropriately. Unless the low-level driver supplies its own display_fg
194 * variable, we use this one for the "master display".
195 */
196 static struct vc_data *master_display_fg;
197
198 /*
199 * Unfortunately, we need to delay tty echo when we're currently writing to the
200 * console since the code is (and always was) not re-entrant, so we schedule
201 * all flip requests to process context with schedule-task() and run it from
202 * console_callback().
203 */
204
205 /*
206 * For the same reason, we defer scrollback to the console callback.
207 */
208 static int scrollback_delta;
209
210 /*
211 * Hook so that the power management routines can (un)blank
212 * the console on our behalf.
213 */
214 int (*console_blank_hook)(int);
215
216 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
217 static int blank_state;
218 static int blank_timer_expired;
219 enum {
220 blank_off = 0,
221 blank_normal_wait,
222 blank_vesa_wait,
223 };
224
225 /*
226 * Notifier list for console events.
227 */
228 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
229
230 int register_vt_notifier(struct notifier_block *nb)
231 {
232 return atomic_notifier_chain_register(&vt_notifier_list, nb);
233 }
234 EXPORT_SYMBOL_GPL(register_vt_notifier);
235
236 int unregister_vt_notifier(struct notifier_block *nb)
237 {
238 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
239 }
240 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
241
242 static void notify_write(struct vc_data *vc, unsigned int unicode)
243 {
244 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
245 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
246 }
247
248 static void notify_update(struct vc_data *vc)
249 {
250 struct vt_notifier_param param = { .vc = vc };
251 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
252 }
253 /*
254 * Low-Level Functions
255 */
256
257 #define IS_FG(vc) ((vc)->vc_num == fg_console)
258
259 #ifdef VT_BUF_VRAM_ONLY
260 #define DO_UPDATE(vc) 0
261 #else
262 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
263 #endif
264
265 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
266 {
267 unsigned short *p;
268
269 if (!viewed)
270 p = (unsigned short *)(vc->vc_origin + offset);
271 else if (!vc->vc_sw->con_screen_pos)
272 p = (unsigned short *)(vc->vc_visible_origin + offset);
273 else
274 p = vc->vc_sw->con_screen_pos(vc, offset);
275 return p;
276 }
277
278 static inline void scrolldelta(int lines)
279 {
280 scrollback_delta += lines;
281 schedule_console_callback();
282 }
283
284 void schedule_console_callback(void)
285 {
286 schedule_work(&console_work);
287 }
288
289 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
290 {
291 unsigned short *d, *s;
292
293 if (t+nr >= b)
294 nr = b - t - 1;
295 if (b > vc->vc_rows || t >= b || nr < 1)
296 return;
297 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
298 return;
299 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
300 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
301 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
302 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
303 vc->vc_size_row * nr);
304 }
305
306 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
307 {
308 unsigned short *s;
309 unsigned int step;
310
311 if (t+nr >= b)
312 nr = b - t - 1;
313 if (b > vc->vc_rows || t >= b || nr < 1)
314 return;
315 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
316 return;
317 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
318 step = vc->vc_cols * nr;
319 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
320 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
321 }
322
323 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
324 {
325 #ifndef VT_BUF_VRAM_ONLY
326 unsigned int xx, yy, offset;
327 u16 *p;
328
329 p = (u16 *) start;
330 if (!vc->vc_sw->con_getxy) {
331 offset = (start - vc->vc_origin) / 2;
332 xx = offset % vc->vc_cols;
333 yy = offset / vc->vc_cols;
334 } else {
335 int nxx, nyy;
336 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
337 xx = nxx; yy = nyy;
338 }
339 for(;;) {
340 u16 attrib = scr_readw(p) & 0xff00;
341 int startx = xx;
342 u16 *q = p;
343 while (xx < vc->vc_cols && count) {
344 if (attrib != (scr_readw(p) & 0xff00)) {
345 if (p > q)
346 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
347 startx = xx;
348 q = p;
349 attrib = scr_readw(p) & 0xff00;
350 }
351 p++;
352 xx++;
353 count--;
354 }
355 if (p > q)
356 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
357 if (!count)
358 break;
359 xx = 0;
360 yy++;
361 if (vc->vc_sw->con_getxy) {
362 p = (u16 *)start;
363 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
364 }
365 }
366 #endif
367 }
368
369 void update_region(struct vc_data *vc, unsigned long start, int count)
370 {
371 WARN_CONSOLE_UNLOCKED();
372
373 if (DO_UPDATE(vc)) {
374 hide_cursor(vc);
375 do_update_region(vc, start, count);
376 set_cursor(vc);
377 }
378 }
379
380 /* Structure of attributes is hardware-dependent */
381
382 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
383 u8 _underline, u8 _reverse, u8 _italic)
384 {
385 if (vc->vc_sw->con_build_attr)
386 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
387 _blink, _underline, _reverse, _italic);
388
389 #ifndef VT_BUF_VRAM_ONLY
390 /*
391 * ++roman: I completely changed the attribute format for monochrome
392 * mode (!can_do_color). The formerly used MDA (monochrome display
393 * adapter) format didn't allow the combination of certain effects.
394 * Now the attribute is just a bit vector:
395 * Bit 0..1: intensity (0..2)
396 * Bit 2 : underline
397 * Bit 3 : reverse
398 * Bit 7 : blink
399 */
400 {
401 u8 a = _color;
402 if (!vc->vc_can_do_color)
403 return _intensity |
404 (_italic ? 2 : 0) |
405 (_underline ? 4 : 0) |
406 (_reverse ? 8 : 0) |
407 (_blink ? 0x80 : 0);
408 if (_italic)
409 a = (a & 0xF0) | vc->vc_itcolor;
410 else if (_underline)
411 a = (a & 0xf0) | vc->vc_ulcolor;
412 else if (_intensity == 0)
413 a = (a & 0xf0) | vc->vc_ulcolor;
414 if (_reverse)
415 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
416 if (_blink)
417 a ^= 0x80;
418 if (_intensity == 2)
419 a ^= 0x08;
420 if (vc->vc_hi_font_mask == 0x100)
421 a <<= 1;
422 return a;
423 }
424 #else
425 return 0;
426 #endif
427 }
428
429 static void update_attr(struct vc_data *vc)
430 {
431 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
432 vc->vc_blink, vc->vc_underline,
433 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
434 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
435 }
436
437 /* Note: inverting the screen twice should revert to the original state */
438 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
439 {
440 unsigned short *p;
441
442 WARN_CONSOLE_UNLOCKED();
443
444 count /= 2;
445 p = screenpos(vc, offset, viewed);
446 if (vc->vc_sw->con_invert_region)
447 vc->vc_sw->con_invert_region(vc, p, count);
448 #ifndef VT_BUF_VRAM_ONLY
449 else {
450 u16 *q = p;
451 int cnt = count;
452 u16 a;
453
454 if (!vc->vc_can_do_color) {
455 while (cnt--) {
456 a = scr_readw(q);
457 a ^= 0x0800;
458 scr_writew(a, q);
459 q++;
460 }
461 } else if (vc->vc_hi_font_mask == 0x100) {
462 while (cnt--) {
463 a = scr_readw(q);
464 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
465 scr_writew(a, q);
466 q++;
467 }
468 } else {
469 while (cnt--) {
470 a = scr_readw(q);
471 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
472 scr_writew(a, q);
473 q++;
474 }
475 }
476 }
477 #endif
478 if (DO_UPDATE(vc))
479 do_update_region(vc, (unsigned long) p, count);
480 }
481
482 /* used by selection: complement pointer position */
483 void complement_pos(struct vc_data *vc, int offset)
484 {
485 static int old_offset = -1;
486 static unsigned short old;
487 static unsigned short oldx, oldy;
488
489 WARN_CONSOLE_UNLOCKED();
490
491 if (old_offset != -1 && old_offset >= 0 &&
492 old_offset < vc->vc_screenbuf_size) {
493 scr_writew(old, screenpos(vc, old_offset, 1));
494 if (DO_UPDATE(vc))
495 vc->vc_sw->con_putc(vc, old, oldy, oldx);
496 }
497
498 old_offset = offset;
499
500 if (offset != -1 && offset >= 0 &&
501 offset < vc->vc_screenbuf_size) {
502 unsigned short new;
503 unsigned short *p;
504 p = screenpos(vc, offset, 1);
505 old = scr_readw(p);
506 new = old ^ vc->vc_complement_mask;
507 scr_writew(new, p);
508 if (DO_UPDATE(vc)) {
509 oldx = (offset >> 1) % vc->vc_cols;
510 oldy = (offset >> 1) / vc->vc_cols;
511 vc->vc_sw->con_putc(vc, new, oldy, oldx);
512 }
513 }
514
515 }
516
517 static void insert_char(struct vc_data *vc, unsigned int nr)
518 {
519 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
520
521 p = q + vc->vc_cols - nr - vc->vc_x;
522 while (--p >= q)
523 scr_writew(scr_readw(p), p + nr);
524 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
525 vc->vc_need_wrap = 0;
526 if (DO_UPDATE(vc)) {
527 unsigned short oldattr = vc->vc_attr;
528 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
529 vc->vc_cols - vc->vc_x - nr);
530 vc->vc_attr = vc->vc_video_erase_char >> 8;
531 while (nr--)
532 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
533 vc->vc_attr = oldattr;
534 }
535 }
536
537 static void delete_char(struct vc_data *vc, unsigned int nr)
538 {
539 unsigned int i = vc->vc_x;
540 unsigned short *p = (unsigned short *)vc->vc_pos;
541
542 while (++i <= vc->vc_cols - nr) {
543 scr_writew(scr_readw(p+nr), p);
544 p++;
545 }
546 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
547 vc->vc_need_wrap = 0;
548 if (DO_UPDATE(vc)) {
549 unsigned short oldattr = vc->vc_attr;
550 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
551 vc->vc_cols - vc->vc_x - nr);
552 vc->vc_attr = vc->vc_video_erase_char >> 8;
553 while (nr--)
554 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
555 vc->vc_cols - 1 - nr);
556 vc->vc_attr = oldattr;
557 }
558 }
559
560 static int softcursor_original;
561
562 static void add_softcursor(struct vc_data *vc)
563 {
564 int i = scr_readw((u16 *) vc->vc_pos);
565 u32 type = vc->vc_cursor_type;
566
567 if (! (type & 0x10)) return;
568 if (softcursor_original != -1) return;
569 softcursor_original = i;
570 i |= ((type >> 8) & 0xff00 );
571 i ^= ((type) & 0xff00 );
572 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
573 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
574 scr_writew(i, (u16 *) vc->vc_pos);
575 if (DO_UPDATE(vc))
576 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
577 }
578
579 static void hide_softcursor(struct vc_data *vc)
580 {
581 if (softcursor_original != -1) {
582 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
583 if (DO_UPDATE(vc))
584 vc->vc_sw->con_putc(vc, softcursor_original,
585 vc->vc_y, vc->vc_x);
586 softcursor_original = -1;
587 }
588 }
589
590 static void hide_cursor(struct vc_data *vc)
591 {
592 if (vc == sel_cons)
593 clear_selection();
594 vc->vc_sw->con_cursor(vc, CM_ERASE);
595 hide_softcursor(vc);
596 }
597
598 static void set_cursor(struct vc_data *vc)
599 {
600 if (!IS_FG(vc) || console_blanked ||
601 vc->vc_mode == KD_GRAPHICS)
602 return;
603 if (vc->vc_deccm) {
604 if (vc == sel_cons)
605 clear_selection();
606 add_softcursor(vc);
607 if ((vc->vc_cursor_type & 0x0f) != 1)
608 vc->vc_sw->con_cursor(vc, CM_DRAW);
609 } else
610 hide_cursor(vc);
611 }
612
613 static void set_origin(struct vc_data *vc)
614 {
615 WARN_CONSOLE_UNLOCKED();
616
617 if (!CON_IS_VISIBLE(vc) ||
618 !vc->vc_sw->con_set_origin ||
619 !vc->vc_sw->con_set_origin(vc))
620 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
621 vc->vc_visible_origin = vc->vc_origin;
622 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
623 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
624 }
625
626 static inline void save_screen(struct vc_data *vc)
627 {
628 WARN_CONSOLE_UNLOCKED();
629
630 if (vc->vc_sw->con_save_screen)
631 vc->vc_sw->con_save_screen(vc);
632 }
633
634 /*
635 * Redrawing of screen
636 */
637
638 static void clear_buffer_attributes(struct vc_data *vc)
639 {
640 unsigned short *p = (unsigned short *)vc->vc_origin;
641 int count = vc->vc_screenbuf_size / 2;
642 int mask = vc->vc_hi_font_mask | 0xff;
643
644 for (; count > 0; count--, p++) {
645 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
646 }
647 }
648
649 void redraw_screen(struct vc_data *vc, int is_switch)
650 {
651 int redraw = 0;
652
653 WARN_CONSOLE_UNLOCKED();
654
655 if (!vc) {
656 /* strange ... */
657 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
658 return;
659 }
660
661 if (is_switch) {
662 struct vc_data *old_vc = vc_cons[fg_console].d;
663 if (old_vc == vc)
664 return;
665 if (!CON_IS_VISIBLE(vc))
666 redraw = 1;
667 *vc->vc_display_fg = vc;
668 fg_console = vc->vc_num;
669 hide_cursor(old_vc);
670 if (!CON_IS_VISIBLE(old_vc)) {
671 save_screen(old_vc);
672 set_origin(old_vc);
673 }
674 } else {
675 hide_cursor(vc);
676 redraw = 1;
677 }
678
679 if (redraw) {
680 int update;
681 int old_was_color = vc->vc_can_do_color;
682
683 set_origin(vc);
684 update = vc->vc_sw->con_switch(vc);
685 set_palette(vc);
686 /*
687 * If console changed from mono<->color, the best we can do
688 * is to clear the buffer attributes. As it currently stands,
689 * rebuilding new attributes from the old buffer is not doable
690 * without overly complex code.
691 */
692 if (old_was_color != vc->vc_can_do_color) {
693 update_attr(vc);
694 clear_buffer_attributes(vc);
695 }
696 if (update && vc->vc_mode != KD_GRAPHICS)
697 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
698 }
699 set_cursor(vc);
700 if (is_switch) {
701 set_leds();
702 compute_shiftstate();
703 notify_update(vc);
704 }
705 }
706
707 /*
708 * Allocation, freeing and resizing of VTs.
709 */
710
711 int vc_cons_allocated(unsigned int i)
712 {
713 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
714 }
715
716 static void visual_init(struct vc_data *vc, int num, int init)
717 {
718 /* ++Geert: vc->vc_sw->con_init determines console size */
719 if (vc->vc_sw)
720 module_put(vc->vc_sw->owner);
721 vc->vc_sw = conswitchp;
722 #ifndef VT_SINGLE_DRIVER
723 if (con_driver_map[num])
724 vc->vc_sw = con_driver_map[num];
725 #endif
726 __module_get(vc->vc_sw->owner);
727 vc->vc_num = num;
728 vc->vc_display_fg = &master_display_fg;
729 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
730 vc->vc_uni_pagedir = 0;
731 vc->vc_hi_font_mask = 0;
732 vc->vc_complement_mask = 0;
733 vc->vc_can_do_color = 0;
734 vc->vc_sw->con_init(vc, init);
735 if (!vc->vc_complement_mask)
736 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
737 vc->vc_s_complement_mask = vc->vc_complement_mask;
738 vc->vc_size_row = vc->vc_cols << 1;
739 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
740 }
741
742 int vc_allocate(unsigned int currcons) /* return 0 on success */
743 {
744 WARN_CONSOLE_UNLOCKED();
745
746 if (currcons >= MAX_NR_CONSOLES)
747 return -ENXIO;
748 if (!vc_cons[currcons].d) {
749 struct vc_data *vc;
750 struct vt_notifier_param param;
751
752 /* prevent users from taking too much memory */
753 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
754 return -EPERM;
755
756 /* due to the granularity of kmalloc, we waste some memory here */
757 /* the alloc is done in two steps, to optimize the common situation
758 of a 25x80 console (structsize=216, screenbuf_size=4000) */
759 /* although the numbers above are not valid since long ago, the
760 point is still up-to-date and the comment still has its value
761 even if only as a historical artifact. --mj, July 1998 */
762 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
763 if (!vc)
764 return -ENOMEM;
765 vc_cons[currcons].d = vc;
766 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
767 visual_init(vc, currcons, 1);
768 if (!*vc->vc_uni_pagedir_loc)
769 con_set_default_unimap(vc);
770 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
771 if (!vc->vc_screenbuf) {
772 kfree(vc);
773 vc_cons[currcons].d = NULL;
774 return -ENOMEM;
775 }
776 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
777 vcs_make_sysfs(currcons);
778 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
779 }
780 return 0;
781 }
782
783 static inline int resize_screen(struct vc_data *vc, int width, int height,
784 int user)
785 {
786 /* Resizes the resolution of the display adapater */
787 int err = 0;
788
789 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
790 err = vc->vc_sw->con_resize(vc, width, height, user);
791
792 return err;
793 }
794
795 /*
796 * Change # of rows and columns (0 means unchanged/the size of fg_console)
797 * [this is to be used together with some user program
798 * like resize that changes the hardware videomode]
799 */
800 #define VC_RESIZE_MAXCOL (32767)
801 #define VC_RESIZE_MAXROW (32767)
802
803 /**
804 * vc_do_resize - resizing method for the tty
805 * @tty: tty being resized
806 * @real_tty: real tty (different to tty if a pty/tty pair)
807 * @vc: virtual console private data
808 * @cols: columns
809 * @lines: lines
810 *
811 * Resize a virtual console, clipping according to the actual constraints.
812 * If the caller passes a tty structure then update the termios winsize
813 * information and perform any neccessary signal handling.
814 *
815 * Caller must hold the console semaphore. Takes the termios mutex and
816 * ctrl_lock of the tty IFF a tty is passed.
817 */
818
819 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
820 unsigned int cols, unsigned int lines)
821 {
822 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
823 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
824 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
825 unsigned int end, user;
826 unsigned short *newscreen;
827
828 WARN_CONSOLE_UNLOCKED();
829
830 if (!vc)
831 return -ENXIO;
832
833 user = vc->vc_resize_user;
834 vc->vc_resize_user = 0;
835
836 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
837 return -EINVAL;
838
839 new_cols = (cols ? cols : vc->vc_cols);
840 new_rows = (lines ? lines : vc->vc_rows);
841 new_row_size = new_cols << 1;
842 new_screen_size = new_row_size * new_rows;
843
844 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
845 return 0;
846
847 newscreen = kmalloc(new_screen_size, GFP_USER);
848 if (!newscreen)
849 return -ENOMEM;
850
851 old_rows = vc->vc_rows;
852 old_cols = vc->vc_cols;
853 old_row_size = vc->vc_size_row;
854 old_screen_size = vc->vc_screenbuf_size;
855
856 err = resize_screen(vc, new_cols, new_rows, user);
857 if (err) {
858 kfree(newscreen);
859 return err;
860 }
861
862 vc->vc_rows = new_rows;
863 vc->vc_cols = new_cols;
864 vc->vc_size_row = new_row_size;
865 vc->vc_screenbuf_size = new_screen_size;
866
867 rlth = min(old_row_size, new_row_size);
868 rrem = new_row_size - rlth;
869 old_origin = vc->vc_origin;
870 new_origin = (long) newscreen;
871 new_scr_end = new_origin + new_screen_size;
872
873 if (vc->vc_y > new_rows) {
874 if (old_rows - vc->vc_y < new_rows) {
875 /*
876 * Cursor near the bottom, copy contents from the
877 * bottom of buffer
878 */
879 old_origin += (old_rows - new_rows) * old_row_size;
880 end = vc->vc_scr_end;
881 } else {
882 /*
883 * Cursor is in no man's land, copy 1/2 screenful
884 * from the top and bottom of cursor position
885 */
886 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
887 end = old_origin + (old_row_size * new_rows);
888 }
889 } else
890 /*
891 * Cursor near the top, copy contents from the top of buffer
892 */
893 end = (old_rows > new_rows) ? old_origin +
894 (old_row_size * new_rows) :
895 vc->vc_scr_end;
896
897 update_attr(vc);
898
899 while (old_origin < end) {
900 scr_memcpyw((unsigned short *) new_origin,
901 (unsigned short *) old_origin, rlth);
902 if (rrem)
903 scr_memsetw((void *)(new_origin + rlth),
904 vc->vc_video_erase_char, rrem);
905 old_origin += old_row_size;
906 new_origin += new_row_size;
907 }
908 if (new_scr_end > new_origin)
909 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
910 new_scr_end - new_origin);
911 kfree(vc->vc_screenbuf);
912 vc->vc_screenbuf = newscreen;
913 vc->vc_screenbuf_size = new_screen_size;
914 set_origin(vc);
915
916 /* do part of a reset_terminal() */
917 vc->vc_top = 0;
918 vc->vc_bottom = vc->vc_rows;
919 gotoxy(vc, vc->vc_x, vc->vc_y);
920 save_cur(vc);
921
922 if (tty) {
923 /* Rewrite the requested winsize data with the actual
924 resulting sizes */
925 struct winsize ws;
926 memset(&ws, 0, sizeof(ws));
927 ws.ws_row = vc->vc_rows;
928 ws.ws_col = vc->vc_cols;
929 ws.ws_ypixel = vc->vc_scan_lines;
930 tty_do_resize(tty, &ws);
931 }
932
933 if (CON_IS_VISIBLE(vc))
934 update_screen(vc);
935 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
936 return err;
937 }
938
939 /**
940 * vc_resize - resize a VT
941 * @vc: virtual console
942 * @cols: columns
943 * @rows: rows
944 *
945 * Resize a virtual console as seen from the console end of things. We
946 * use the common vc_do_resize methods to update the structures. The
947 * caller must hold the console sem to protect console internals and
948 * vc->vc_tty
949 */
950
951 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
952 {
953 return vc_do_resize(vc->vc_tty, vc, cols, rows);
954 }
955
956 /**
957 * vt_resize - resize a VT
958 * @tty: tty to resize
959 * @ws: winsize attributes
960 *
961 * Resize a virtual terminal. This is called by the tty layer as we
962 * register our own handler for resizing. The mutual helper does all
963 * the actual work.
964 *
965 * Takes the console sem and the called methods then take the tty
966 * termios_mutex and the tty ctrl_lock in that order.
967 */
968 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
969 {
970 struct vc_data *vc = tty->driver_data;
971 int ret;
972
973 acquire_console_sem();
974 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
975 release_console_sem();
976 return ret;
977 }
978
979 void vc_deallocate(unsigned int currcons)
980 {
981 WARN_CONSOLE_UNLOCKED();
982
983 if (vc_cons_allocated(currcons)) {
984 struct vc_data *vc = vc_cons[currcons].d;
985 struct vt_notifier_param param = { .vc = vc };
986
987 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
988 vcs_remove_sysfs(currcons);
989 vc->vc_sw->con_deinit(vc);
990 put_pid(vc->vt_pid);
991 module_put(vc->vc_sw->owner);
992 kfree(vc->vc_screenbuf);
993 if (currcons >= MIN_NR_CONSOLES)
994 kfree(vc);
995 vc_cons[currcons].d = NULL;
996 }
997 }
998
999 /*
1000 * VT102 emulator
1001 */
1002
1003 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1004 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1005 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1006
1007 #define decarm VC_REPEAT
1008 #define decckm VC_CKMODE
1009 #define kbdapplic VC_APPLIC
1010 #define lnm VC_CRLF
1011
1012 /*
1013 * this is what the terminal answers to a ESC-Z or csi0c query.
1014 */
1015 #define VT100ID "\033[?1;2c"
1016 #define VT102ID "\033[?6c"
1017
1018 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1019 8,12,10,14, 9,13,11,15 };
1020
1021 /* the default colour table, for VGA+ colour systems */
1022 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1023 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1024 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1025 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1026 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1027 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1028
1029 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1030 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1031 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1032
1033 /*
1034 * gotoxy() must verify all boundaries, because the arguments
1035 * might also be negative. If the given position is out of
1036 * bounds, the cursor is placed at the nearest margin.
1037 */
1038 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1039 {
1040 int min_y, max_y;
1041
1042 if (new_x < 0)
1043 vc->vc_x = 0;
1044 else {
1045 if (new_x >= vc->vc_cols)
1046 vc->vc_x = vc->vc_cols - 1;
1047 else
1048 vc->vc_x = new_x;
1049 }
1050
1051 if (vc->vc_decom) {
1052 min_y = vc->vc_top;
1053 max_y = vc->vc_bottom;
1054 } else {
1055 min_y = 0;
1056 max_y = vc->vc_rows;
1057 }
1058 if (new_y < min_y)
1059 vc->vc_y = min_y;
1060 else if (new_y >= max_y)
1061 vc->vc_y = max_y - 1;
1062 else
1063 vc->vc_y = new_y;
1064 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1065 vc->vc_need_wrap = 0;
1066 }
1067
1068 /* for absolute user moves, when decom is set */
1069 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1070 {
1071 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1072 }
1073
1074 void scrollback(struct vc_data *vc, int lines)
1075 {
1076 if (!lines)
1077 lines = vc->vc_rows / 2;
1078 scrolldelta(-lines);
1079 }
1080
1081 void scrollfront(struct vc_data *vc, int lines)
1082 {
1083 if (!lines)
1084 lines = vc->vc_rows / 2;
1085 scrolldelta(lines);
1086 }
1087
1088 static void lf(struct vc_data *vc)
1089 {
1090 /* don't scroll if above bottom of scrolling region, or
1091 * if below scrolling region
1092 */
1093 if (vc->vc_y + 1 == vc->vc_bottom)
1094 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1095 else if (vc->vc_y < vc->vc_rows - 1) {
1096 vc->vc_y++;
1097 vc->vc_pos += vc->vc_size_row;
1098 }
1099 vc->vc_need_wrap = 0;
1100 notify_write(vc, '\n');
1101 }
1102
1103 static void ri(struct vc_data *vc)
1104 {
1105 /* don't scroll if below top of scrolling region, or
1106 * if above scrolling region
1107 */
1108 if (vc->vc_y == vc->vc_top)
1109 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1110 else if (vc->vc_y > 0) {
1111 vc->vc_y--;
1112 vc->vc_pos -= vc->vc_size_row;
1113 }
1114 vc->vc_need_wrap = 0;
1115 }
1116
1117 static inline void cr(struct vc_data *vc)
1118 {
1119 vc->vc_pos -= vc->vc_x << 1;
1120 vc->vc_need_wrap = vc->vc_x = 0;
1121 notify_write(vc, '\r');
1122 }
1123
1124 static inline void bs(struct vc_data *vc)
1125 {
1126 if (vc->vc_x) {
1127 vc->vc_pos -= 2;
1128 vc->vc_x--;
1129 vc->vc_need_wrap = 0;
1130 notify_write(vc, '\b');
1131 }
1132 }
1133
1134 static inline void del(struct vc_data *vc)
1135 {
1136 /* ignored */
1137 }
1138
1139 static void csi_J(struct vc_data *vc, int vpar)
1140 {
1141 unsigned int count;
1142 unsigned short * start;
1143
1144 switch (vpar) {
1145 case 0: /* erase from cursor to end of display */
1146 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1147 start = (unsigned short *)vc->vc_pos;
1148 if (DO_UPDATE(vc)) {
1149 /* do in two stages */
1150 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1151 vc->vc_cols - vc->vc_x);
1152 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1153 vc->vc_rows - vc->vc_y - 1,
1154 vc->vc_cols);
1155 }
1156 break;
1157 case 1: /* erase from start to cursor */
1158 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1159 start = (unsigned short *)vc->vc_origin;
1160 if (DO_UPDATE(vc)) {
1161 /* do in two stages */
1162 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1163 vc->vc_cols);
1164 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1165 vc->vc_x + 1);
1166 }
1167 break;
1168 case 2: /* erase whole display */
1169 count = vc->vc_cols * vc->vc_rows;
1170 start = (unsigned short *)vc->vc_origin;
1171 if (DO_UPDATE(vc))
1172 vc->vc_sw->con_clear(vc, 0, 0,
1173 vc->vc_rows,
1174 vc->vc_cols);
1175 break;
1176 default:
1177 return;
1178 }
1179 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1180 vc->vc_need_wrap = 0;
1181 }
1182
1183 static void csi_K(struct vc_data *vc, int vpar)
1184 {
1185 unsigned int count;
1186 unsigned short * start;
1187
1188 switch (vpar) {
1189 case 0: /* erase from cursor to end of line */
1190 count = vc->vc_cols - vc->vc_x;
1191 start = (unsigned short *)vc->vc_pos;
1192 if (DO_UPDATE(vc))
1193 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1194 vc->vc_cols - vc->vc_x);
1195 break;
1196 case 1: /* erase from start of line to cursor */
1197 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1198 count = vc->vc_x + 1;
1199 if (DO_UPDATE(vc))
1200 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1201 vc->vc_x + 1);
1202 break;
1203 case 2: /* erase whole line */
1204 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1205 count = vc->vc_cols;
1206 if (DO_UPDATE(vc))
1207 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1208 vc->vc_cols);
1209 break;
1210 default:
1211 return;
1212 }
1213 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1214 vc->vc_need_wrap = 0;
1215 }
1216
1217 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1218 { /* not vt100? */
1219 int count;
1220
1221 if (!vpar)
1222 vpar++;
1223 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1224
1225 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1226 if (DO_UPDATE(vc))
1227 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1228 vc->vc_need_wrap = 0;
1229 }
1230
1231 static void default_attr(struct vc_data *vc)
1232 {
1233 vc->vc_intensity = 1;
1234 vc->vc_italic = 0;
1235 vc->vc_underline = 0;
1236 vc->vc_reverse = 0;
1237 vc->vc_blink = 0;
1238 vc->vc_color = vc->vc_def_color;
1239 }
1240
1241 /* console_sem is held */
1242 static void csi_m(struct vc_data *vc)
1243 {
1244 int i;
1245
1246 for (i = 0; i <= vc->vc_npar; i++)
1247 switch (vc->vc_par[i]) {
1248 case 0: /* all attributes off */
1249 default_attr(vc);
1250 break;
1251 case 1:
1252 vc->vc_intensity = 2;
1253 break;
1254 case 2:
1255 vc->vc_intensity = 0;
1256 break;
1257 case 3:
1258 vc->vc_italic = 1;
1259 break;
1260 case 4:
1261 vc->vc_underline = 1;
1262 break;
1263 case 5:
1264 vc->vc_blink = 1;
1265 break;
1266 case 7:
1267 vc->vc_reverse = 1;
1268 break;
1269 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1270 * Select primary font, don't display
1271 * control chars if defined, don't set
1272 * bit 8 on output.
1273 */
1274 vc->vc_translate = set_translate(vc->vc_charset == 0
1275 ? vc->vc_G0_charset
1276 : vc->vc_G1_charset, vc);
1277 vc->vc_disp_ctrl = 0;
1278 vc->vc_toggle_meta = 0;
1279 break;
1280 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1281 * Select first alternate font, lets
1282 * chars < 32 be displayed as ROM chars.
1283 */
1284 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1285 vc->vc_disp_ctrl = 1;
1286 vc->vc_toggle_meta = 0;
1287 break;
1288 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1289 * Select second alternate font, toggle
1290 * high bit before displaying as ROM char.
1291 */
1292 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1293 vc->vc_disp_ctrl = 1;
1294 vc->vc_toggle_meta = 1;
1295 break;
1296 case 21:
1297 case 22:
1298 vc->vc_intensity = 1;
1299 break;
1300 case 23:
1301 vc->vc_italic = 0;
1302 break;
1303 case 24:
1304 vc->vc_underline = 0;
1305 break;
1306 case 25:
1307 vc->vc_blink = 0;
1308 break;
1309 case 27:
1310 vc->vc_reverse = 0;
1311 break;
1312 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1313 * Enables underscore, white foreground
1314 * with white underscore (Linux - use
1315 * default foreground).
1316 */
1317 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1318 vc->vc_underline = 1;
1319 break;
1320 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1321 * Disable underline option.
1322 * Reset colour to default? It did this
1323 * before...
1324 */
1325 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1326 vc->vc_underline = 0;
1327 break;
1328 case 49:
1329 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1330 break;
1331 default:
1332 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1333 vc->vc_color = color_table[vc->vc_par[i] - 30]
1334 | (vc->vc_color & 0xf0);
1335 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1336 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1337 | (vc->vc_color & 0x0f);
1338 break;
1339 }
1340 update_attr(vc);
1341 }
1342
1343 static void respond_string(const char *p, struct tty_struct *tty)
1344 {
1345 while (*p) {
1346 tty_insert_flip_char(tty, *p, 0);
1347 p++;
1348 }
1349 con_schedule_flip(tty);
1350 }
1351
1352 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1353 {
1354 char buf[40];
1355
1356 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1357 respond_string(buf, tty);
1358 }
1359
1360 static inline void status_report(struct tty_struct *tty)
1361 {
1362 respond_string("\033[0n", tty); /* Terminal ok */
1363 }
1364
1365 static inline void respond_ID(struct tty_struct * tty)
1366 {
1367 respond_string(VT102ID, tty);
1368 }
1369
1370 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1371 {
1372 char buf[8];
1373
1374 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1375 (char)('!' + mry));
1376 respond_string(buf, tty);
1377 }
1378
1379 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1380 int mouse_reporting(void)
1381 {
1382 return vc_cons[fg_console].d->vc_report_mouse;
1383 }
1384
1385 /* console_sem is held */
1386 static void set_mode(struct vc_data *vc, int on_off)
1387 {
1388 int i;
1389
1390 for (i = 0; i <= vc->vc_npar; i++)
1391 if (vc->vc_ques) {
1392 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1393 case 1: /* Cursor keys send ^[Ox/^[[x */
1394 if (on_off)
1395 set_kbd(vc, decckm);
1396 else
1397 clr_kbd(vc, decckm);
1398 break;
1399 case 3: /* 80/132 mode switch unimplemented */
1400 vc->vc_deccolm = on_off;
1401 #if 0
1402 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1403 /* this alone does not suffice; some user mode
1404 utility has to change the hardware regs */
1405 #endif
1406 break;
1407 case 5: /* Inverted screen on/off */
1408 if (vc->vc_decscnm != on_off) {
1409 vc->vc_decscnm = on_off;
1410 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1411 update_attr(vc);
1412 }
1413 break;
1414 case 6: /* Origin relative/absolute */
1415 vc->vc_decom = on_off;
1416 gotoxay(vc, 0, 0);
1417 break;
1418 case 7: /* Autowrap on/off */
1419 vc->vc_decawm = on_off;
1420 break;
1421 case 8: /* Autorepeat on/off */
1422 if (on_off)
1423 set_kbd(vc, decarm);
1424 else
1425 clr_kbd(vc, decarm);
1426 break;
1427 case 9:
1428 vc->vc_report_mouse = on_off ? 1 : 0;
1429 break;
1430 case 25: /* Cursor on/off */
1431 vc->vc_deccm = on_off;
1432 break;
1433 case 1000:
1434 vc->vc_report_mouse = on_off ? 2 : 0;
1435 break;
1436 }
1437 } else {
1438 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1439 case 3: /* Monitor (display ctrls) */
1440 vc->vc_disp_ctrl = on_off;
1441 break;
1442 case 4: /* Insert Mode on/off */
1443 vc->vc_decim = on_off;
1444 break;
1445 case 20: /* Lf, Enter == CrLf/Lf */
1446 if (on_off)
1447 set_kbd(vc, lnm);
1448 else
1449 clr_kbd(vc, lnm);
1450 break;
1451 }
1452 }
1453 }
1454
1455 /* console_sem is held */
1456 static void setterm_command(struct vc_data *vc)
1457 {
1458 switch(vc->vc_par[0]) {
1459 case 1: /* set color for underline mode */
1460 if (vc->vc_can_do_color &&
1461 vc->vc_par[1] < 16) {
1462 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1463 if (vc->vc_underline)
1464 update_attr(vc);
1465 }
1466 break;
1467 case 2: /* set color for half intensity mode */
1468 if (vc->vc_can_do_color &&
1469 vc->vc_par[1] < 16) {
1470 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1471 if (vc->vc_intensity == 0)
1472 update_attr(vc);
1473 }
1474 break;
1475 case 8: /* store colors as defaults */
1476 vc->vc_def_color = vc->vc_attr;
1477 if (vc->vc_hi_font_mask == 0x100)
1478 vc->vc_def_color >>= 1;
1479 default_attr(vc);
1480 update_attr(vc);
1481 break;
1482 case 9: /* set blanking interval */
1483 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1484 poke_blanked_console();
1485 break;
1486 case 10: /* set bell frequency in Hz */
1487 if (vc->vc_npar >= 1)
1488 vc->vc_bell_pitch = vc->vc_par[1];
1489 else
1490 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1491 break;
1492 case 11: /* set bell duration in msec */
1493 if (vc->vc_npar >= 1)
1494 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1495 vc->vc_par[1] * HZ / 1000 : 0;
1496 else
1497 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1498 break;
1499 case 12: /* bring specified console to the front */
1500 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1501 set_console(vc->vc_par[1] - 1);
1502 break;
1503 case 13: /* unblank the screen */
1504 poke_blanked_console();
1505 break;
1506 case 14: /* set vesa powerdown interval */
1507 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1508 break;
1509 case 15: /* activate the previous console */
1510 set_console(last_console);
1511 break;
1512 }
1513 }
1514
1515 /* console_sem is held */
1516 static void csi_at(struct vc_data *vc, unsigned int nr)
1517 {
1518 if (nr > vc->vc_cols - vc->vc_x)
1519 nr = vc->vc_cols - vc->vc_x;
1520 else if (!nr)
1521 nr = 1;
1522 insert_char(vc, nr);
1523 }
1524
1525 /* console_sem is held */
1526 static void csi_L(struct vc_data *vc, unsigned int nr)
1527 {
1528 if (nr > vc->vc_rows - vc->vc_y)
1529 nr = vc->vc_rows - vc->vc_y;
1530 else if (!nr)
1531 nr = 1;
1532 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1533 vc->vc_need_wrap = 0;
1534 }
1535
1536 /* console_sem is held */
1537 static void csi_P(struct vc_data *vc, unsigned int nr)
1538 {
1539 if (nr > vc->vc_cols - vc->vc_x)
1540 nr = vc->vc_cols - vc->vc_x;
1541 else if (!nr)
1542 nr = 1;
1543 delete_char(vc, nr);
1544 }
1545
1546 /* console_sem is held */
1547 static void csi_M(struct vc_data *vc, unsigned int nr)
1548 {
1549 if (nr > vc->vc_rows - vc->vc_y)
1550 nr = vc->vc_rows - vc->vc_y;
1551 else if (!nr)
1552 nr=1;
1553 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1554 vc->vc_need_wrap = 0;
1555 }
1556
1557 /* console_sem is held (except via vc_init->reset_terminal */
1558 static void save_cur(struct vc_data *vc)
1559 {
1560 vc->vc_saved_x = vc->vc_x;
1561 vc->vc_saved_y = vc->vc_y;
1562 vc->vc_s_intensity = vc->vc_intensity;
1563 vc->vc_s_italic = vc->vc_italic;
1564 vc->vc_s_underline = vc->vc_underline;
1565 vc->vc_s_blink = vc->vc_blink;
1566 vc->vc_s_reverse = vc->vc_reverse;
1567 vc->vc_s_charset = vc->vc_charset;
1568 vc->vc_s_color = vc->vc_color;
1569 vc->vc_saved_G0 = vc->vc_G0_charset;
1570 vc->vc_saved_G1 = vc->vc_G1_charset;
1571 }
1572
1573 /* console_sem is held */
1574 static void restore_cur(struct vc_data *vc)
1575 {
1576 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1577 vc->vc_intensity = vc->vc_s_intensity;
1578 vc->vc_italic = vc->vc_s_italic;
1579 vc->vc_underline = vc->vc_s_underline;
1580 vc->vc_blink = vc->vc_s_blink;
1581 vc->vc_reverse = vc->vc_s_reverse;
1582 vc->vc_charset = vc->vc_s_charset;
1583 vc->vc_color = vc->vc_s_color;
1584 vc->vc_G0_charset = vc->vc_saved_G0;
1585 vc->vc_G1_charset = vc->vc_saved_G1;
1586 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1587 update_attr(vc);
1588 vc->vc_need_wrap = 0;
1589 }
1590
1591 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1592 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1593 ESpalette };
1594
1595 /* console_sem is held (except via vc_init()) */
1596 static void reset_terminal(struct vc_data *vc, int do_clear)
1597 {
1598 vc->vc_top = 0;
1599 vc->vc_bottom = vc->vc_rows;
1600 vc->vc_state = ESnormal;
1601 vc->vc_ques = 0;
1602 vc->vc_translate = set_translate(LAT1_MAP, vc);
1603 vc->vc_G0_charset = LAT1_MAP;
1604 vc->vc_G1_charset = GRAF_MAP;
1605 vc->vc_charset = 0;
1606 vc->vc_need_wrap = 0;
1607 vc->vc_report_mouse = 0;
1608 vc->vc_utf = default_utf8;
1609 vc->vc_utf_count = 0;
1610
1611 vc->vc_disp_ctrl = 0;
1612 vc->vc_toggle_meta = 0;
1613
1614 vc->vc_decscnm = 0;
1615 vc->vc_decom = 0;
1616 vc->vc_decawm = 1;
1617 vc->vc_deccm = 1;
1618 vc->vc_decim = 0;
1619
1620 set_kbd(vc, decarm);
1621 clr_kbd(vc, decckm);
1622 clr_kbd(vc, kbdapplic);
1623 clr_kbd(vc, lnm);
1624 kbd_table[vc->vc_num].lockstate = 0;
1625 kbd_table[vc->vc_num].slockstate = 0;
1626 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1627 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1628 /* do not do set_leds here because this causes an endless tasklet loop
1629 when the keyboard hasn't been initialized yet */
1630
1631 vc->vc_cursor_type = CUR_DEFAULT;
1632 vc->vc_complement_mask = vc->vc_s_complement_mask;
1633
1634 default_attr(vc);
1635 update_attr(vc);
1636
1637 vc->vc_tab_stop[0] = 0x01010100;
1638 vc->vc_tab_stop[1] =
1639 vc->vc_tab_stop[2] =
1640 vc->vc_tab_stop[3] =
1641 vc->vc_tab_stop[4] =
1642 vc->vc_tab_stop[5] =
1643 vc->vc_tab_stop[6] =
1644 vc->vc_tab_stop[7] = 0x01010101;
1645
1646 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1647 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1648
1649 gotoxy(vc, 0, 0);
1650 save_cur(vc);
1651 if (do_clear)
1652 csi_J(vc, 2);
1653 }
1654
1655 /* console_sem is held */
1656 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1657 {
1658 /*
1659 * Control characters can be used in the _middle_
1660 * of an escape sequence.
1661 */
1662 switch (c) {
1663 case 0:
1664 return;
1665 case 7:
1666 if (vc->vc_bell_duration)
1667 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1668 return;
1669 case 8:
1670 bs(vc);
1671 return;
1672 case 9:
1673 vc->vc_pos -= (vc->vc_x << 1);
1674 while (vc->vc_x < vc->vc_cols - 1) {
1675 vc->vc_x++;
1676 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1677 break;
1678 }
1679 vc->vc_pos += (vc->vc_x << 1);
1680 notify_write(vc, '\t');
1681 return;
1682 case 10: case 11: case 12:
1683 lf(vc);
1684 if (!is_kbd(vc, lnm))
1685 return;
1686 case 13:
1687 cr(vc);
1688 return;
1689 case 14:
1690 vc->vc_charset = 1;
1691 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1692 vc->vc_disp_ctrl = 1;
1693 return;
1694 case 15:
1695 vc->vc_charset = 0;
1696 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1697 vc->vc_disp_ctrl = 0;
1698 return;
1699 case 24: case 26:
1700 vc->vc_state = ESnormal;
1701 return;
1702 case 27:
1703 vc->vc_state = ESesc;
1704 return;
1705 case 127:
1706 del(vc);
1707 return;
1708 case 128+27:
1709 vc->vc_state = ESsquare;
1710 return;
1711 }
1712 switch(vc->vc_state) {
1713 case ESesc:
1714 vc->vc_state = ESnormal;
1715 switch (c) {
1716 case '[':
1717 vc->vc_state = ESsquare;
1718 return;
1719 case ']':
1720 vc->vc_state = ESnonstd;
1721 return;
1722 case '%':
1723 vc->vc_state = ESpercent;
1724 return;
1725 case 'E':
1726 cr(vc);
1727 lf(vc);
1728 return;
1729 case 'M':
1730 ri(vc);
1731 return;
1732 case 'D':
1733 lf(vc);
1734 return;
1735 case 'H':
1736 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1737 return;
1738 case 'Z':
1739 respond_ID(tty);
1740 return;
1741 case '7':
1742 save_cur(vc);
1743 return;
1744 case '8':
1745 restore_cur(vc);
1746 return;
1747 case '(':
1748 vc->vc_state = ESsetG0;
1749 return;
1750 case ')':
1751 vc->vc_state = ESsetG1;
1752 return;
1753 case '#':
1754 vc->vc_state = EShash;
1755 return;
1756 case 'c':
1757 reset_terminal(vc, 1);
1758 return;
1759 case '>': /* Numeric keypad */
1760 clr_kbd(vc, kbdapplic);
1761 return;
1762 case '=': /* Appl. keypad */
1763 set_kbd(vc, kbdapplic);
1764 return;
1765 }
1766 return;
1767 case ESnonstd:
1768 if (c=='P') { /* palette escape sequence */
1769 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1770 vc->vc_par[vc->vc_npar] = 0;
1771 vc->vc_npar = 0;
1772 vc->vc_state = ESpalette;
1773 return;
1774 } else if (c=='R') { /* reset palette */
1775 reset_palette(vc);
1776 vc->vc_state = ESnormal;
1777 } else
1778 vc->vc_state = ESnormal;
1779 return;
1780 case ESpalette:
1781 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1782 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1783 if (vc->vc_npar == 7) {
1784 int i = vc->vc_par[0] * 3, j = 1;
1785 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1786 vc->vc_palette[i++] += vc->vc_par[j++];
1787 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1788 vc->vc_palette[i++] += vc->vc_par[j++];
1789 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1790 vc->vc_palette[i] += vc->vc_par[j];
1791 set_palette(vc);
1792 vc->vc_state = ESnormal;
1793 }
1794 } else
1795 vc->vc_state = ESnormal;
1796 return;
1797 case ESsquare:
1798 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1799 vc->vc_par[vc->vc_npar] = 0;
1800 vc->vc_npar = 0;
1801 vc->vc_state = ESgetpars;
1802 if (c == '[') { /* Function key */
1803 vc->vc_state=ESfunckey;
1804 return;
1805 }
1806 vc->vc_ques = (c == '?');
1807 if (vc->vc_ques)
1808 return;
1809 case ESgetpars:
1810 if (c == ';' && vc->vc_npar < NPAR - 1) {
1811 vc->vc_npar++;
1812 return;
1813 } else if (c>='0' && c<='9') {
1814 vc->vc_par[vc->vc_npar] *= 10;
1815 vc->vc_par[vc->vc_npar] += c - '0';
1816 return;
1817 } else
1818 vc->vc_state = ESgotpars;
1819 case ESgotpars:
1820 vc->vc_state = ESnormal;
1821 switch(c) {
1822 case 'h':
1823 set_mode(vc, 1);
1824 return;
1825 case 'l':
1826 set_mode(vc, 0);
1827 return;
1828 case 'c':
1829 if (vc->vc_ques) {
1830 if (vc->vc_par[0])
1831 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1832 else
1833 vc->vc_cursor_type = CUR_DEFAULT;
1834 return;
1835 }
1836 break;
1837 case 'm':
1838 if (vc->vc_ques) {
1839 clear_selection();
1840 if (vc->vc_par[0])
1841 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1842 else
1843 vc->vc_complement_mask = vc->vc_s_complement_mask;
1844 return;
1845 }
1846 break;
1847 case 'n':
1848 if (!vc->vc_ques) {
1849 if (vc->vc_par[0] == 5)
1850 status_report(tty);
1851 else if (vc->vc_par[0] == 6)
1852 cursor_report(vc, tty);
1853 }
1854 return;
1855 }
1856 if (vc->vc_ques) {
1857 vc->vc_ques = 0;
1858 return;
1859 }
1860 switch(c) {
1861 case 'G': case '`':
1862 if (vc->vc_par[0])
1863 vc->vc_par[0]--;
1864 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1865 return;
1866 case 'A':
1867 if (!vc->vc_par[0])
1868 vc->vc_par[0]++;
1869 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1870 return;
1871 case 'B': case 'e':
1872 if (!vc->vc_par[0])
1873 vc->vc_par[0]++;
1874 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1875 return;
1876 case 'C': case 'a':
1877 if (!vc->vc_par[0])
1878 vc->vc_par[0]++;
1879 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1880 return;
1881 case 'D':
1882 if (!vc->vc_par[0])
1883 vc->vc_par[0]++;
1884 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1885 return;
1886 case 'E':
1887 if (!vc->vc_par[0])
1888 vc->vc_par[0]++;
1889 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1890 return;
1891 case 'F':
1892 if (!vc->vc_par[0])
1893 vc->vc_par[0]++;
1894 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1895 return;
1896 case 'd':
1897 if (vc->vc_par[0])
1898 vc->vc_par[0]--;
1899 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1900 return;
1901 case 'H': case 'f':
1902 if (vc->vc_par[0])
1903 vc->vc_par[0]--;
1904 if (vc->vc_par[1])
1905 vc->vc_par[1]--;
1906 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1907 return;
1908 case 'J':
1909 csi_J(vc, vc->vc_par[0]);
1910 return;
1911 case 'K':
1912 csi_K(vc, vc->vc_par[0]);
1913 return;
1914 case 'L':
1915 csi_L(vc, vc->vc_par[0]);
1916 return;
1917 case 'M':
1918 csi_M(vc, vc->vc_par[0]);
1919 return;
1920 case 'P':
1921 csi_P(vc, vc->vc_par[0]);
1922 return;
1923 case 'c':
1924 if (!vc->vc_par[0])
1925 respond_ID(tty);
1926 return;
1927 case 'g':
1928 if (!vc->vc_par[0])
1929 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1930 else if (vc->vc_par[0] == 3) {
1931 vc->vc_tab_stop[0] =
1932 vc->vc_tab_stop[1] =
1933 vc->vc_tab_stop[2] =
1934 vc->vc_tab_stop[3] =
1935 vc->vc_tab_stop[4] =
1936 vc->vc_tab_stop[5] =
1937 vc->vc_tab_stop[6] =
1938 vc->vc_tab_stop[7] = 0;
1939 }
1940 return;
1941 case 'm':
1942 csi_m(vc);
1943 return;
1944 case 'q': /* DECLL - but only 3 leds */
1945 /* map 0,1,2,3 to 0,1,2,4 */
1946 if (vc->vc_par[0] < 4)
1947 setledstate(kbd_table + vc->vc_num,
1948 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1949 return;
1950 case 'r':
1951 if (!vc->vc_par[0])
1952 vc->vc_par[0]++;
1953 if (!vc->vc_par[1])
1954 vc->vc_par[1] = vc->vc_rows;
1955 /* Minimum allowed region is 2 lines */
1956 if (vc->vc_par[0] < vc->vc_par[1] &&
1957 vc->vc_par[1] <= vc->vc_rows) {
1958 vc->vc_top = vc->vc_par[0] - 1;
1959 vc->vc_bottom = vc->vc_par[1];
1960 gotoxay(vc, 0, 0);
1961 }
1962 return;
1963 case 's':
1964 save_cur(vc);
1965 return;
1966 case 'u':
1967 restore_cur(vc);
1968 return;
1969 case 'X':
1970 csi_X(vc, vc->vc_par[0]);
1971 return;
1972 case '@':
1973 csi_at(vc, vc->vc_par[0]);
1974 return;
1975 case ']': /* setterm functions */
1976 setterm_command(vc);
1977 return;
1978 }
1979 return;
1980 case ESpercent:
1981 vc->vc_state = ESnormal;
1982 switch (c) {
1983 case '@': /* defined in ISO 2022 */
1984 vc->vc_utf = 0;
1985 return;
1986 case 'G': /* prelim official escape code */
1987 case '8': /* retained for compatibility */
1988 vc->vc_utf = 1;
1989 return;
1990 }
1991 return;
1992 case ESfunckey:
1993 vc->vc_state = ESnormal;
1994 return;
1995 case EShash:
1996 vc->vc_state = ESnormal;
1997 if (c == '8') {
1998 /* DEC screen alignment test. kludge :-) */
1999 vc->vc_video_erase_char =
2000 (vc->vc_video_erase_char & 0xff00) | 'E';
2001 csi_J(vc, 2);
2002 vc->vc_video_erase_char =
2003 (vc->vc_video_erase_char & 0xff00) | ' ';
2004 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2005 }
2006 return;
2007 case ESsetG0:
2008 if (c == '0')
2009 vc->vc_G0_charset = GRAF_MAP;
2010 else if (c == 'B')
2011 vc->vc_G0_charset = LAT1_MAP;
2012 else if (c == 'U')
2013 vc->vc_G0_charset = IBMPC_MAP;
2014 else if (c == 'K')
2015 vc->vc_G0_charset = USER_MAP;
2016 if (vc->vc_charset == 0)
2017 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2018 vc->vc_state = ESnormal;
2019 return;
2020 case ESsetG1:
2021 if (c == '0')
2022 vc->vc_G1_charset = GRAF_MAP;
2023 else if (c == 'B')
2024 vc->vc_G1_charset = LAT1_MAP;
2025 else if (c == 'U')
2026 vc->vc_G1_charset = IBMPC_MAP;
2027 else if (c == 'K')
2028 vc->vc_G1_charset = USER_MAP;
2029 if (vc->vc_charset == 1)
2030 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2031 vc->vc_state = ESnormal;
2032 return;
2033 default:
2034 vc->vc_state = ESnormal;
2035 }
2036 }
2037
2038 /* This is a temporary buffer used to prepare a tty console write
2039 * so that we can easily avoid touching user space while holding the
2040 * console spinlock. It is allocated in con_init and is shared by
2041 * this code and the vc_screen read/write tty calls.
2042 *
2043 * We have to allocate this statically in the kernel data section
2044 * since console_init (and thus con_init) are called before any
2045 * kernel memory allocation is available.
2046 */
2047 char con_buf[CON_BUF_SIZE];
2048 DEFINE_MUTEX(con_buf_mtx);
2049
2050 /* is_double_width() is based on the wcwidth() implementation by
2051 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2052 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2053 */
2054 struct interval {
2055 uint32_t first;
2056 uint32_t last;
2057 };
2058
2059 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2060 {
2061 int min = 0;
2062 int mid;
2063
2064 if (ucs < table[0].first || ucs > table[max].last)
2065 return 0;
2066 while (max >= min) {
2067 mid = (min + max) / 2;
2068 if (ucs > table[mid].last)
2069 min = mid + 1;
2070 else if (ucs < table[mid].first)
2071 max = mid - 1;
2072 else
2073 return 1;
2074 }
2075 return 0;
2076 }
2077
2078 static int is_double_width(uint32_t ucs)
2079 {
2080 static const struct interval double_width[] = {
2081 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2082 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2083 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2084 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2085 };
2086 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2087 }
2088
2089 /* acquires console_sem */
2090 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2091 {
2092 #ifdef VT_BUF_VRAM_ONLY
2093 #define FLUSH do { } while(0);
2094 #else
2095 #define FLUSH if (draw_x >= 0) { \
2096 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2097 draw_x = -1; \
2098 }
2099 #endif
2100
2101 int c, tc, ok, n = 0, draw_x = -1;
2102 unsigned int currcons;
2103 unsigned long draw_from = 0, draw_to = 0;
2104 struct vc_data *vc;
2105 unsigned char vc_attr;
2106 struct vt_notifier_param param;
2107 uint8_t rescan;
2108 uint8_t inverse;
2109 uint8_t width;
2110 u16 himask, charmask;
2111 const unsigned char *orig_buf = NULL;
2112 int orig_count;
2113
2114 if (in_interrupt())
2115 return count;
2116
2117 might_sleep();
2118
2119 acquire_console_sem();
2120 vc = tty->driver_data;
2121 if (vc == NULL) {
2122 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2123 release_console_sem();
2124 return 0;
2125 }
2126
2127 currcons = vc->vc_num;
2128 if (!vc_cons_allocated(currcons)) {
2129 /* could this happen? */
2130 printk_once("con_write: tty %d not allocated\n", currcons+1);
2131 release_console_sem();
2132 return 0;
2133 }
2134 orig_buf = buf;
2135 orig_count = count;
2136
2137 himask = vc->vc_hi_font_mask;
2138 charmask = himask ? 0x1ff : 0xff;
2139
2140 /* undraw cursor first */
2141 if (IS_FG(vc))
2142 hide_cursor(vc);
2143
2144 param.vc = vc;
2145
2146 while (!tty->stopped && count) {
2147 int orig = *buf;
2148 c = orig;
2149 buf++;
2150 n++;
2151 count--;
2152 rescan = 0;
2153 inverse = 0;
2154 width = 1;
2155
2156 /* Do no translation at all in control states */
2157 if (vc->vc_state != ESnormal) {
2158 tc = c;
2159 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2160 /* Combine UTF-8 into Unicode in vc_utf_char.
2161 * vc_utf_count is the number of continuation bytes still
2162 * expected to arrive.
2163 * vc_npar is the number of continuation bytes arrived so
2164 * far
2165 */
2166 rescan_last_byte:
2167 if ((c & 0xc0) == 0x80) {
2168 /* Continuation byte received */
2169 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2170 if (vc->vc_utf_count) {
2171 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2172 vc->vc_npar++;
2173 if (--vc->vc_utf_count) {
2174 /* Still need some bytes */
2175 continue;
2176 }
2177 /* Got a whole character */
2178 c = vc->vc_utf_char;
2179 /* Reject overlong sequences */
2180 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2181 c > utf8_length_changes[vc->vc_npar])
2182 c = 0xfffd;
2183 } else {
2184 /* Unexpected continuation byte */
2185 vc->vc_utf_count = 0;
2186 c = 0xfffd;
2187 }
2188 } else {
2189 /* Single ASCII byte or first byte of a sequence received */
2190 if (vc->vc_utf_count) {
2191 /* Continuation byte expected */
2192 rescan = 1;
2193 vc->vc_utf_count = 0;
2194 c = 0xfffd;
2195 } else if (c > 0x7f) {
2196 /* First byte of a multibyte sequence received */
2197 vc->vc_npar = 0;
2198 if ((c & 0xe0) == 0xc0) {
2199 vc->vc_utf_count = 1;
2200 vc->vc_utf_char = (c & 0x1f);
2201 } else if ((c & 0xf0) == 0xe0) {
2202 vc->vc_utf_count = 2;
2203 vc->vc_utf_char = (c & 0x0f);
2204 } else if ((c & 0xf8) == 0xf0) {
2205 vc->vc_utf_count = 3;
2206 vc->vc_utf_char = (c & 0x07);
2207 } else if ((c & 0xfc) == 0xf8) {
2208 vc->vc_utf_count = 4;
2209 vc->vc_utf_char = (c & 0x03);
2210 } else if ((c & 0xfe) == 0xfc) {
2211 vc->vc_utf_count = 5;
2212 vc->vc_utf_char = (c & 0x01);
2213 } else {
2214 /* 254 and 255 are invalid */
2215 c = 0xfffd;
2216 }
2217 if (vc->vc_utf_count) {
2218 /* Still need some bytes */
2219 continue;
2220 }
2221 }
2222 /* Nothing to do if an ASCII byte was received */
2223 }
2224 /* End of UTF-8 decoding. */
2225 /* c is the received character, or U+FFFD for invalid sequences. */
2226 /* Replace invalid Unicode code points with U+FFFD too */
2227 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2228 c = 0xfffd;
2229 tc = c;
2230 } else { /* no utf or alternate charset mode */
2231 tc = vc_translate(vc, c);
2232 }
2233
2234 param.c = tc;
2235 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2236 &param) == NOTIFY_STOP)
2237 continue;
2238
2239 /* If the original code was a control character we
2240 * only allow a glyph to be displayed if the code is
2241 * not normally used (such as for cursor movement) or
2242 * if the disp_ctrl mode has been explicitly enabled.
2243 * Certain characters (as given by the CTRL_ALWAYS
2244 * bitmap) are always displayed as control characters,
2245 * as the console would be pretty useless without
2246 * them; to display an arbitrary font position use the
2247 * direct-to-font zone in UTF-8 mode.
2248 */
2249 ok = tc && (c >= 32 ||
2250 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2251 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2252 && (c != 127 || vc->vc_disp_ctrl)
2253 && (c != 128+27);
2254
2255 if (vc->vc_state == ESnormal && ok) {
2256 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2257 if (is_double_width(c))
2258 width = 2;
2259 }
2260 /* Now try to find out how to display it */
2261 tc = conv_uni_to_pc(vc, tc);
2262 if (tc & ~charmask) {
2263 if (tc == -1 || tc == -2) {
2264 continue; /* nothing to display */
2265 }
2266 /* Glyph not found */
2267 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2268 /* In legacy mode use the glyph we get by a 1:1 mapping.
2269 This would make absolutely no sense with Unicode in mind,
2270 but do this for ASCII characters since a font may lack
2271 Unicode mapping info and we don't want to end up with
2272 having question marks only. */
2273 tc = c;
2274 } else {
2275 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2276 tc = conv_uni_to_pc(vc, 0xfffd);
2277 if (tc < 0) {
2278 inverse = 1;
2279 tc = conv_uni_to_pc(vc, '?');
2280 if (tc < 0) tc = '?';
2281 }
2282 }
2283 }
2284
2285 if (!inverse) {
2286 vc_attr = vc->vc_attr;
2287 } else {
2288 /* invert vc_attr */
2289 if (!vc->vc_can_do_color) {
2290 vc_attr = (vc->vc_attr) ^ 0x08;
2291 } else if (vc->vc_hi_font_mask == 0x100) {
2292 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2293 } else {
2294 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2295 }
2296 FLUSH
2297 }
2298
2299 while (1) {
2300 if (vc->vc_need_wrap || vc->vc_decim)
2301 FLUSH
2302 if (vc->vc_need_wrap) {
2303 cr(vc);
2304 lf(vc);
2305 }
2306 if (vc->vc_decim)
2307 insert_char(vc, 1);
2308 scr_writew(himask ?
2309 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2310 (vc_attr << 8) + tc,
2311 (u16 *) vc->vc_pos);
2312 if (DO_UPDATE(vc) && draw_x < 0) {
2313 draw_x = vc->vc_x;
2314 draw_from = vc->vc_pos;
2315 }
2316 if (vc->vc_x == vc->vc_cols - 1) {
2317 vc->vc_need_wrap = vc->vc_decawm;
2318 draw_to = vc->vc_pos + 2;
2319 } else {
2320 vc->vc_x++;
2321 draw_to = (vc->vc_pos += 2);
2322 }
2323
2324 if (!--width) break;
2325
2326 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2327 if (tc < 0) tc = ' ';
2328 }
2329 notify_write(vc, c);
2330
2331 if (inverse) {
2332 FLUSH
2333 }
2334
2335 if (rescan) {
2336 rescan = 0;
2337 inverse = 0;
2338 width = 1;
2339 c = orig;
2340 goto rescan_last_byte;
2341 }
2342 continue;
2343 }
2344 FLUSH
2345 do_con_trol(tty, vc, orig);
2346 }
2347 FLUSH
2348 console_conditional_schedule();
2349 release_console_sem();
2350 notify_update(vc);
2351 return n;
2352 #undef FLUSH
2353 }
2354
2355 /*
2356 * This is the console switching callback.
2357 *
2358 * Doing console switching in a process context allows
2359 * us to do the switches asynchronously (needed when we want
2360 * to switch due to a keyboard interrupt). Synchronization
2361 * with other console code and prevention of re-entrancy is
2362 * ensured with console_sem.
2363 */
2364 static void console_callback(struct work_struct *ignored)
2365 {
2366 acquire_console_sem();
2367
2368 if (want_console >= 0) {
2369 if (want_console != fg_console &&
2370 vc_cons_allocated(want_console)) {
2371 hide_cursor(vc_cons[fg_console].d);
2372 change_console(vc_cons[want_console].d);
2373 /* we only changed when the console had already
2374 been allocated - a new console is not created
2375 in an interrupt routine */
2376 }
2377 want_console = -1;
2378 }
2379 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2380 do_poke_blanked_console = 0;
2381 poke_blanked_console();
2382 }
2383 if (scrollback_delta) {
2384 struct vc_data *vc = vc_cons[fg_console].d;
2385 clear_selection();
2386 if (vc->vc_mode == KD_TEXT)
2387 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2388 scrollback_delta = 0;
2389 }
2390 if (blank_timer_expired) {
2391 do_blank_screen(0);
2392 blank_timer_expired = 0;
2393 }
2394 notify_update(vc_cons[fg_console].d);
2395
2396 release_console_sem();
2397 }
2398
2399 int set_console(int nr)
2400 {
2401 struct vc_data *vc = vc_cons[fg_console].d;
2402
2403 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2404 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2405
2406 /*
2407 * Console switch will fail in console_callback() or
2408 * change_console() so there is no point scheduling
2409 * the callback
2410 *
2411 * Existing set_console() users don't check the return
2412 * value so this shouldn't break anything
2413 */
2414 return -EINVAL;
2415 }
2416
2417 want_console = nr;
2418 schedule_console_callback();
2419
2420 return 0;
2421 }
2422
2423 struct tty_driver *console_driver;
2424
2425 #ifdef CONFIG_VT_CONSOLE
2426
2427 /**
2428 * vt_kmsg_redirect() - Sets/gets the kernel message console
2429 * @new: The new virtual terminal number or -1 if the console should stay
2430 * unchanged
2431 *
2432 * By default, the kernel messages are always printed on the current virtual
2433 * console. However, the user may modify that default with the
2434 * TIOCL_SETKMSGREDIRECT ioctl call.
2435 *
2436 * This function sets the kernel message console to be @new. It returns the old
2437 * virtual console number. The virtual terminal number 0 (both as parameter and
2438 * return value) means no redirection (i.e. always printed on the currently
2439 * active console).
2440 *
2441 * The parameter -1 means that only the current console is returned, but the
2442 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2443 * case to make the code more understandable.
2444 *
2445 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2446 * the parameter and always returns 0.
2447 */
2448 int vt_kmsg_redirect(int new)
2449 {
2450 static int kmsg_con;
2451
2452 if (new != -1)
2453 return xchg(&kmsg_con, new);
2454 else
2455 return kmsg_con;
2456 }
2457
2458 /*
2459 * Console on virtual terminal
2460 *
2461 * The console must be locked when we get here.
2462 */
2463
2464 static void vt_console_print(struct console *co, const char *b, unsigned count)
2465 {
2466 struct vc_data *vc = vc_cons[fg_console].d;
2467 unsigned char c;
2468 static DEFINE_SPINLOCK(printing_lock);
2469 const ushort *start;
2470 ushort cnt = 0;
2471 ushort myx;
2472 int kmsg_console;
2473
2474 /* console busy or not yet initialized */
2475 if (!printable)
2476 return;
2477 if (!spin_trylock(&printing_lock))
2478 return;
2479
2480 kmsg_console = vt_get_kmsg_redirect();
2481 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2482 vc = vc_cons[kmsg_console - 1].d;
2483
2484 /* read `x' only after setting currcons properly (otherwise
2485 the `x' macro will read the x of the foreground console). */
2486 myx = vc->vc_x;
2487
2488 if (!vc_cons_allocated(fg_console)) {
2489 /* impossible */
2490 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2491 goto quit;
2492 }
2493
2494 if (vc->vc_mode != KD_TEXT)
2495 goto quit;
2496
2497 /* undraw cursor first */
2498 if (IS_FG(vc))
2499 hide_cursor(vc);
2500
2501 start = (ushort *)vc->vc_pos;
2502
2503 /* Contrived structure to try to emulate original need_wrap behaviour
2504 * Problems caused when we have need_wrap set on '\n' character */
2505 while (count--) {
2506 c = *b++;
2507 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2508 if (cnt > 0) {
2509 if (CON_IS_VISIBLE(vc))
2510 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2511 vc->vc_x += cnt;
2512 if (vc->vc_need_wrap)
2513 vc->vc_x--;
2514 cnt = 0;
2515 }
2516 if (c == 8) { /* backspace */
2517 bs(vc);
2518 start = (ushort *)vc->vc_pos;
2519 myx = vc->vc_x;
2520 continue;
2521 }
2522 if (c != 13)
2523 lf(vc);
2524 cr(vc);
2525 start = (ushort *)vc->vc_pos;
2526 myx = vc->vc_x;
2527 if (c == 10 || c == 13)
2528 continue;
2529 }
2530 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2531 notify_write(vc, c);
2532 cnt++;
2533 if (myx == vc->vc_cols - 1) {
2534 vc->vc_need_wrap = 1;
2535 continue;
2536 }
2537 vc->vc_pos += 2;
2538 myx++;
2539 }
2540 if (cnt > 0) {
2541 if (CON_IS_VISIBLE(vc))
2542 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2543 vc->vc_x += cnt;
2544 if (vc->vc_x == vc->vc_cols) {
2545 vc->vc_x--;
2546 vc->vc_need_wrap = 1;
2547 }
2548 }
2549 set_cursor(vc);
2550 notify_update(vc);
2551
2552 quit:
2553 spin_unlock(&printing_lock);
2554 }
2555
2556 static struct tty_driver *vt_console_device(struct console *c, int *index)
2557 {
2558 *index = c->index ? c->index-1 : fg_console;
2559 return console_driver;
2560 }
2561
2562 static struct console vt_console_driver = {
2563 .name = "tty",
2564 .write = vt_console_print,
2565 .device = vt_console_device,
2566 .unblank = unblank_screen,
2567 .flags = CON_PRINTBUFFER,
2568 .index = -1,
2569 };
2570 #endif
2571
2572 /*
2573 * Handling of Linux-specific VC ioctls
2574 */
2575
2576 /*
2577 * Generally a bit racy with respect to console_sem().
2578 *
2579 * There are some functions which don't need it.
2580 *
2581 * There are some functions which can sleep for arbitrary periods
2582 * (paste_selection) but we don't need the lock there anyway.
2583 *
2584 * set_selection has locking, and definitely needs it
2585 */
2586
2587 int tioclinux(struct tty_struct *tty, unsigned long arg)
2588 {
2589 char type, data;
2590 char __user *p = (char __user *)arg;
2591 int lines;
2592 int ret;
2593
2594 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2595 return -EPERM;
2596 if (get_user(type, p))
2597 return -EFAULT;
2598 ret = 0;
2599
2600 lock_kernel();
2601
2602 switch (type)
2603 {
2604 case TIOCL_SETSEL:
2605 acquire_console_sem();
2606 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2607 release_console_sem();
2608 break;
2609 case TIOCL_PASTESEL:
2610 ret = paste_selection(tty);
2611 break;
2612 case TIOCL_UNBLANKSCREEN:
2613 acquire_console_sem();
2614 unblank_screen();
2615 release_console_sem();
2616 break;
2617 case TIOCL_SELLOADLUT:
2618 ret = sel_loadlut(p);
2619 break;
2620 case TIOCL_GETSHIFTSTATE:
2621
2622 /*
2623 * Make it possible to react to Shift+Mousebutton.
2624 * Note that 'shift_state' is an undocumented
2625 * kernel-internal variable; programs not closely
2626 * related to the kernel should not use this.
2627 */
2628 data = shift_state;
2629 ret = __put_user(data, p);
2630 break;
2631 case TIOCL_GETMOUSEREPORTING:
2632 data = mouse_reporting();
2633 ret = __put_user(data, p);
2634 break;
2635 case TIOCL_SETVESABLANK:
2636 ret = set_vesa_blanking(p);
2637 break;
2638 case TIOCL_GETKMSGREDIRECT:
2639 data = vt_get_kmsg_redirect();
2640 ret = __put_user(data, p);
2641 break;
2642 case TIOCL_SETKMSGREDIRECT:
2643 if (!capable(CAP_SYS_ADMIN)) {
2644 ret = -EPERM;
2645 } else {
2646 if (get_user(data, p+1))
2647 ret = -EFAULT;
2648 else
2649 vt_kmsg_redirect(data);
2650 }
2651 break;
2652 case TIOCL_GETFGCONSOLE:
2653 ret = fg_console;
2654 break;
2655 case TIOCL_SCROLLCONSOLE:
2656 if (get_user(lines, (s32 __user *)(p+4))) {
2657 ret = -EFAULT;
2658 } else {
2659 scrollfront(vc_cons[fg_console].d, lines);
2660 ret = 0;
2661 }
2662 break;
2663 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2664 acquire_console_sem();
2665 ignore_poke = 1;
2666 do_blank_screen(0);
2667 release_console_sem();
2668 break;
2669 case TIOCL_BLANKEDSCREEN:
2670 ret = console_blanked;
2671 break;
2672 default:
2673 ret = -EINVAL;
2674 break;
2675 }
2676 unlock_kernel();
2677 return ret;
2678 }
2679
2680 /*
2681 * /dev/ttyN handling
2682 */
2683
2684 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2685 {
2686 int retval;
2687
2688 retval = do_con_write(tty, buf, count);
2689 con_flush_chars(tty);
2690
2691 return retval;
2692 }
2693
2694 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2695 {
2696 if (in_interrupt())
2697 return 0; /* n_r3964 calls put_char() from interrupt context */
2698 return do_con_write(tty, &ch, 1);
2699 }
2700
2701 static int con_write_room(struct tty_struct *tty)
2702 {
2703 if (tty->stopped)
2704 return 0;
2705 return 32768; /* No limit, really; we're not buffering */
2706 }
2707
2708 static int con_chars_in_buffer(struct tty_struct *tty)
2709 {
2710 return 0; /* we're not buffering */
2711 }
2712
2713 /*
2714 * con_throttle and con_unthrottle are only used for
2715 * paste_selection(), which has to stuff in a large number of
2716 * characters...
2717 */
2718 static void con_throttle(struct tty_struct *tty)
2719 {
2720 }
2721
2722 static void con_unthrottle(struct tty_struct *tty)
2723 {
2724 struct vc_data *vc = tty->driver_data;
2725
2726 wake_up_interruptible(&vc->paste_wait);
2727 }
2728
2729 /*
2730 * Turn the Scroll-Lock LED on when the tty is stopped
2731 */
2732 static void con_stop(struct tty_struct *tty)
2733 {
2734 int console_num;
2735 if (!tty)
2736 return;
2737 console_num = tty->index;
2738 if (!vc_cons_allocated(console_num))
2739 return;
2740 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2741 set_leds();
2742 }
2743
2744 /*
2745 * Turn the Scroll-Lock LED off when the console is started
2746 */
2747 static void con_start(struct tty_struct *tty)
2748 {
2749 int console_num;
2750 if (!tty)
2751 return;
2752 console_num = tty->index;
2753 if (!vc_cons_allocated(console_num))
2754 return;
2755 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2756 set_leds();
2757 }
2758
2759 static void con_flush_chars(struct tty_struct *tty)
2760 {
2761 struct vc_data *vc;
2762
2763 if (in_interrupt()) /* from flush_to_ldisc */
2764 return;
2765
2766 /* if we race with con_close(), vt may be null */
2767 acquire_console_sem();
2768 vc = tty->driver_data;
2769 if (vc)
2770 set_cursor(vc);
2771 release_console_sem();
2772 }
2773
2774 /*
2775 * Allocate the console screen memory.
2776 */
2777 static int con_open(struct tty_struct *tty, struct file *filp)
2778 {
2779 unsigned int currcons = tty->index;
2780 int ret = 0;
2781
2782 acquire_console_sem();
2783 if (tty->driver_data == NULL) {
2784 ret = vc_allocate(currcons);
2785 if (ret == 0) {
2786 struct vc_data *vc = vc_cons[currcons].d;
2787
2788 /* Still being freed */
2789 if (vc->vc_tty) {
2790 release_console_sem();
2791 return -ERESTARTSYS;
2792 }
2793 tty->driver_data = vc;
2794 vc->vc_tty = tty;
2795
2796 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2797 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2798 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2799 }
2800 if (vc->vc_utf)
2801 tty->termios->c_iflag |= IUTF8;
2802 else
2803 tty->termios->c_iflag &= ~IUTF8;
2804 release_console_sem();
2805 return ret;
2806 }
2807 }
2808 release_console_sem();
2809 return ret;
2810 }
2811
2812 static void con_close(struct tty_struct *tty, struct file *filp)
2813 {
2814 /* Nothing to do - we defer to shutdown */
2815 }
2816
2817 static void con_shutdown(struct tty_struct *tty)
2818 {
2819 struct vc_data *vc = tty->driver_data;
2820 BUG_ON(vc == NULL);
2821 acquire_console_sem();
2822 vc->vc_tty = NULL;
2823 release_console_sem();
2824 tty_shutdown(tty);
2825 }
2826
2827 static int default_italic_color = 2; // green (ASCII)
2828 static int default_underline_color = 3; // cyan (ASCII)
2829 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2830 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2831
2832 static void vc_init(struct vc_data *vc, unsigned int rows,
2833 unsigned int cols, int do_clear)
2834 {
2835 int j, k ;
2836
2837 vc->vc_cols = cols;
2838 vc->vc_rows = rows;
2839 vc->vc_size_row = cols << 1;
2840 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2841
2842 set_origin(vc);
2843 vc->vc_pos = vc->vc_origin;
2844 reset_vc(vc);
2845 for (j=k=0; j<16; j++) {
2846 vc->vc_palette[k++] = default_red[j] ;
2847 vc->vc_palette[k++] = default_grn[j] ;
2848 vc->vc_palette[k++] = default_blu[j] ;
2849 }
2850 vc->vc_def_color = 0x07; /* white */
2851 vc->vc_ulcolor = default_underline_color;
2852 vc->vc_itcolor = default_italic_color;
2853 vc->vc_halfcolor = 0x08; /* grey */
2854 init_waitqueue_head(&vc->paste_wait);
2855 reset_terminal(vc, do_clear);
2856 }
2857
2858 /*
2859 * This routine initializes console interrupts, and does nothing
2860 * else. If you want the screen to clear, call tty_write with
2861 * the appropriate escape-sequence.
2862 */
2863
2864 static int __init con_init(void)
2865 {
2866 const char *display_desc = NULL;
2867 struct vc_data *vc;
2868 unsigned int currcons = 0, i;
2869
2870 acquire_console_sem();
2871
2872 if (conswitchp)
2873 display_desc = conswitchp->con_startup();
2874 if (!display_desc) {
2875 fg_console = 0;
2876 release_console_sem();
2877 return 0;
2878 }
2879
2880 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2881 struct con_driver *con_driver = &registered_con_driver[i];
2882
2883 if (con_driver->con == NULL) {
2884 con_driver->con = conswitchp;
2885 con_driver->desc = display_desc;
2886 con_driver->flag = CON_DRIVER_FLAG_INIT;
2887 con_driver->first = 0;
2888 con_driver->last = MAX_NR_CONSOLES - 1;
2889 break;
2890 }
2891 }
2892
2893 for (i = 0; i < MAX_NR_CONSOLES; i++)
2894 con_driver_map[i] = conswitchp;
2895
2896 if (blankinterval) {
2897 blank_state = blank_normal_wait;
2898 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2899 }
2900
2901 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2902 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2903 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2904 visual_init(vc, currcons, 1);
2905 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2906 vc_init(vc, vc->vc_rows, vc->vc_cols,
2907 currcons || !vc->vc_sw->con_save_screen);
2908 }
2909 currcons = fg_console = 0;
2910 master_display_fg = vc = vc_cons[currcons].d;
2911 set_origin(vc);
2912 save_screen(vc);
2913 gotoxy(vc, vc->vc_x, vc->vc_y);
2914 csi_J(vc, 0);
2915 update_screen(vc);
2916 printk("Console: %s %s %dx%d",
2917 vc->vc_can_do_color ? "colour" : "mono",
2918 display_desc, vc->vc_cols, vc->vc_rows);
2919 printable = 1;
2920 printk("\n");
2921
2922 release_console_sem();
2923
2924 #ifdef CONFIG_VT_CONSOLE
2925 register_console(&vt_console_driver);
2926 #endif
2927 return 0;
2928 }
2929 console_initcall(con_init);
2930
2931 static const struct tty_operations con_ops = {
2932 .open = con_open,
2933 .close = con_close,
2934 .write = con_write,
2935 .write_room = con_write_room,
2936 .put_char = con_put_char,
2937 .flush_chars = con_flush_chars,
2938 .chars_in_buffer = con_chars_in_buffer,
2939 .ioctl = vt_ioctl,
2940 #ifdef CONFIG_COMPAT
2941 .compat_ioctl = vt_compat_ioctl,
2942 #endif
2943 .stop = con_stop,
2944 .start = con_start,
2945 .throttle = con_throttle,
2946 .unthrottle = con_unthrottle,
2947 .resize = vt_resize,
2948 .shutdown = con_shutdown
2949 };
2950
2951 static struct cdev vc0_cdev;
2952
2953 int __init vty_init(const struct file_operations *console_fops)
2954 {
2955 cdev_init(&vc0_cdev, console_fops);
2956 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2957 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2958 panic("Couldn't register /dev/tty0 driver\n");
2959 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2960
2961 vcs_init();
2962
2963 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2964 if (!console_driver)
2965 panic("Couldn't allocate console driver\n");
2966 console_driver->owner = THIS_MODULE;
2967 console_driver->name = "tty";
2968 console_driver->name_base = 1;
2969 console_driver->major = TTY_MAJOR;
2970 console_driver->minor_start = 1;
2971 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2972 console_driver->init_termios = tty_std_termios;
2973 if (default_utf8)
2974 console_driver->init_termios.c_iflag |= IUTF8;
2975 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2976 tty_set_operations(console_driver, &con_ops);
2977 if (tty_register_driver(console_driver))
2978 panic("Couldn't register console driver\n");
2979 kbd_init();
2980 console_map_init();
2981 #ifdef CONFIG_MDA_CONSOLE
2982 mda_console_init();
2983 #endif
2984 return 0;
2985 }
2986
2987 #ifndef VT_SINGLE_DRIVER
2988
2989 static struct class *vtconsole_class;
2990
2991 static int bind_con_driver(const struct consw *csw, int first, int last,
2992 int deflt)
2993 {
2994 struct module *owner = csw->owner;
2995 const char *desc = NULL;
2996 struct con_driver *con_driver;
2997 int i, j = -1, k = -1, retval = -ENODEV;
2998
2999 if (!try_module_get(owner))
3000 return -ENODEV;
3001
3002 acquire_console_sem();
3003
3004 /* check if driver is registered */
3005 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3006 con_driver = &registered_con_driver[i];
3007
3008 if (con_driver->con == csw) {
3009 desc = con_driver->desc;
3010 retval = 0;
3011 break;
3012 }
3013 }
3014
3015 if (retval)
3016 goto err;
3017
3018 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3019 csw->con_startup();
3020 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3021 }
3022
3023 if (deflt) {
3024 if (conswitchp)
3025 module_put(conswitchp->owner);
3026
3027 __module_get(owner);
3028 conswitchp = csw;
3029 }
3030
3031 first = max(first, con_driver->first);
3032 last = min(last, con_driver->last);
3033
3034 for (i = first; i <= last; i++) {
3035 int old_was_color;
3036 struct vc_data *vc = vc_cons[i].d;
3037
3038 if (con_driver_map[i])
3039 module_put(con_driver_map[i]->owner);
3040 __module_get(owner);
3041 con_driver_map[i] = csw;
3042
3043 if (!vc || !vc->vc_sw)
3044 continue;
3045
3046 j = i;
3047
3048 if (CON_IS_VISIBLE(vc)) {
3049 k = i;
3050 save_screen(vc);
3051 }
3052
3053 old_was_color = vc->vc_can_do_color;
3054 vc->vc_sw->con_deinit(vc);
3055 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3056 visual_init(vc, i, 0);
3057 set_origin(vc);
3058 update_attr(vc);
3059
3060 /* If the console changed between mono <-> color, then
3061 * the attributes in the screenbuf will be wrong. The
3062 * following resets all attributes to something sane.
3063 */
3064 if (old_was_color != vc->vc_can_do_color)
3065 clear_buffer_attributes(vc);
3066 }
3067
3068 printk("Console: switching ");
3069 if (!deflt)
3070 printk("consoles %d-%d ", first+1, last+1);
3071 if (j >= 0) {
3072 struct vc_data *vc = vc_cons[j].d;
3073
3074 printk("to %s %s %dx%d\n",
3075 vc->vc_can_do_color ? "colour" : "mono",
3076 desc, vc->vc_cols, vc->vc_rows);
3077
3078 if (k >= 0) {
3079 vc = vc_cons[k].d;
3080 update_screen(vc);
3081 }
3082 } else
3083 printk("to %s\n", desc);
3084
3085 retval = 0;
3086 err:
3087 release_console_sem();
3088 module_put(owner);
3089 return retval;
3090 };
3091
3092 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3093 static int con_is_graphics(const struct consw *csw, int first, int last)
3094 {
3095 int i, retval = 0;
3096
3097 for (i = first; i <= last; i++) {
3098 struct vc_data *vc = vc_cons[i].d;
3099
3100 if (vc && vc->vc_mode == KD_GRAPHICS) {
3101 retval = 1;
3102 break;
3103 }
3104 }
3105
3106 return retval;
3107 }
3108
3109 /**
3110 * unbind_con_driver - unbind a console driver
3111 * @csw: pointer to console driver to unregister
3112 * @first: first in range of consoles that @csw should be unbound from
3113 * @last: last in range of consoles that @csw should be unbound from
3114 * @deflt: should next bound console driver be default after @csw is unbound?
3115 *
3116 * To unbind a driver from all possible consoles, pass 0 as @first and
3117 * %MAX_NR_CONSOLES as @last.
3118 *
3119 * @deflt controls whether the console that ends up replacing @csw should be
3120 * the default console.
3121 *
3122 * RETURNS:
3123 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3124 * or 0 on success.
3125 */
3126 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3127 {
3128 struct module *owner = csw->owner;
3129 const struct consw *defcsw = NULL;
3130 struct con_driver *con_driver = NULL, *con_back = NULL;
3131 int i, retval = -ENODEV;
3132
3133 if (!try_module_get(owner))
3134 return -ENODEV;
3135
3136 acquire_console_sem();
3137
3138 /* check if driver is registered and if it is unbindable */
3139 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3140 con_driver = &registered_con_driver[i];
3141
3142 if (con_driver->con == csw &&
3143 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3144 retval = 0;
3145 break;
3146 }
3147 }
3148
3149 if (retval) {
3150 release_console_sem();
3151 goto err;
3152 }
3153
3154 retval = -ENODEV;
3155
3156 /* check if backup driver exists */
3157 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3158 con_back = &registered_con_driver[i];
3159
3160 if (con_back->con &&
3161 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3162 defcsw = con_back->con;
3163 retval = 0;
3164 break;
3165 }
3166 }
3167
3168 if (retval) {
3169 release_console_sem();
3170 goto err;
3171 }
3172
3173 if (!con_is_bound(csw)) {
3174 release_console_sem();
3175 goto err;
3176 }
3177
3178 first = max(first, con_driver->first);
3179 last = min(last, con_driver->last);
3180
3181 for (i = first; i <= last; i++) {
3182 if (con_driver_map[i] == csw) {
3183 module_put(csw->owner);
3184 con_driver_map[i] = NULL;
3185 }
3186 }
3187
3188 if (!con_is_bound(defcsw)) {
3189 const struct consw *defconsw = conswitchp;
3190
3191 defcsw->con_startup();
3192 con_back->flag |= CON_DRIVER_FLAG_INIT;
3193 /*
3194 * vgacon may change the default driver to point
3195 * to dummycon, we restore it here...
3196 */
3197 conswitchp = defconsw;
3198 }
3199
3200 if (!con_is_bound(csw))
3201 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3202
3203 release_console_sem();
3204 /* ignore return value, binding should not fail */
3205 bind_con_driver(defcsw, first, last, deflt);
3206 err:
3207 module_put(owner);
3208 return retval;
3209
3210 }
3211 EXPORT_SYMBOL(unbind_con_driver);
3212
3213 static int vt_bind(struct con_driver *con)
3214 {
3215 const struct consw *defcsw = NULL, *csw = NULL;
3216 int i, more = 1, first = -1, last = -1, deflt = 0;
3217
3218 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3219 con_is_graphics(con->con, con->first, con->last))
3220 goto err;
3221
3222 csw = con->con;
3223
3224 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3225 struct con_driver *con = &registered_con_driver[i];
3226
3227 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3228 defcsw = con->con;
3229 break;
3230 }
3231 }
3232
3233 if (!defcsw)
3234 goto err;
3235
3236 while (more) {
3237 more = 0;
3238
3239 for (i = con->first; i <= con->last; i++) {
3240 if (con_driver_map[i] == defcsw) {
3241 if (first == -1)
3242 first = i;
3243 last = i;
3244 more = 1;
3245 } else if (first != -1)
3246 break;
3247 }
3248
3249 if (first == 0 && last == MAX_NR_CONSOLES -1)
3250 deflt = 1;
3251
3252 if (first != -1)
3253 bind_con_driver(csw, first, last, deflt);
3254
3255 first = -1;
3256 last = -1;
3257 deflt = 0;
3258 }
3259
3260 err:
3261 return 0;
3262 }
3263
3264 static int vt_unbind(struct con_driver *con)
3265 {
3266 const struct consw *csw = NULL;
3267 int i, more = 1, first = -1, last = -1, deflt = 0;
3268
3269 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3270 con_is_graphics(con->con, con->first, con->last))
3271 goto err;
3272
3273 csw = con->con;
3274
3275 while (more) {
3276 more = 0;
3277
3278 for (i = con->first; i <= con->last; i++) {
3279 if (con_driver_map[i] == csw) {
3280 if (first == -1)
3281 first = i;
3282 last = i;
3283 more = 1;
3284 } else if (first != -1)
3285 break;
3286 }
3287
3288 if (first == 0 && last == MAX_NR_CONSOLES -1)
3289 deflt = 1;
3290
3291 if (first != -1)
3292 unbind_con_driver(csw, first, last, deflt);
3293
3294 first = -1;
3295 last = -1;
3296 deflt = 0;
3297 }
3298
3299 err:
3300 return 0;
3301 }
3302 #else
3303 static inline int vt_bind(struct con_driver *con)
3304 {
3305 return 0;
3306 }
3307 static inline int vt_unbind(struct con_driver *con)
3308 {
3309 return 0;
3310 }
3311 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3312
3313 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3314 const char *buf, size_t count)
3315 {
3316 struct con_driver *con = dev_get_drvdata(dev);
3317 int bind = simple_strtoul(buf, NULL, 0);
3318
3319 if (bind)
3320 vt_bind(con);
3321 else
3322 vt_unbind(con);
3323
3324 return count;
3325 }
3326
3327 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3328 char *buf)
3329 {
3330 struct con_driver *con = dev_get_drvdata(dev);
3331 int bind = con_is_bound(con->con);
3332
3333 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3334 }
3335
3336 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3337 char *buf)
3338 {
3339 struct con_driver *con = dev_get_drvdata(dev);
3340
3341 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3342 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3343 con->desc);
3344
3345 }
3346
3347 static struct device_attribute device_attrs[] = {
3348 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3349 __ATTR(name, S_IRUGO, show_name, NULL),
3350 };
3351
3352 static int vtconsole_init_device(struct con_driver *con)
3353 {
3354 int i;
3355 int error = 0;
3356
3357 con->flag |= CON_DRIVER_FLAG_ATTR;
3358 dev_set_drvdata(con->dev, con);
3359 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3360 error = device_create_file(con->dev, &device_attrs[i]);
3361 if (error)
3362 break;
3363 }
3364
3365 if (error) {
3366 while (--i >= 0)
3367 device_remove_file(con->dev, &device_attrs[i]);
3368 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3369 }
3370
3371 return error;
3372 }
3373
3374 static void vtconsole_deinit_device(struct con_driver *con)
3375 {
3376 int i;
3377
3378 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3379 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3380 device_remove_file(con->dev, &device_attrs[i]);
3381 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3382 }
3383 }
3384
3385 /**
3386 * con_is_bound - checks if driver is bound to the console
3387 * @csw: console driver
3388 *
3389 * RETURNS: zero if unbound, nonzero if bound
3390 *
3391 * Drivers can call this and if zero, they should release
3392 * all resources allocated on con_startup()
3393 */
3394 int con_is_bound(const struct consw *csw)
3395 {
3396 int i, bound = 0;
3397
3398 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3399 if (con_driver_map[i] == csw) {
3400 bound = 1;
3401 break;
3402 }
3403 }
3404
3405 return bound;
3406 }
3407 EXPORT_SYMBOL(con_is_bound);
3408
3409 /**
3410 * register_con_driver - register console driver to console layer
3411 * @csw: console driver
3412 * @first: the first console to take over, minimum value is 0
3413 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3414 *
3415 * DESCRIPTION: This function registers a console driver which can later
3416 * bind to a range of consoles specified by @first and @last. It will
3417 * also initialize the console driver by calling con_startup().
3418 */
3419 int register_con_driver(const struct consw *csw, int first, int last)
3420 {
3421 struct module *owner = csw->owner;
3422 struct con_driver *con_driver;
3423 const char *desc;
3424 int i, retval = 0;
3425
3426 if (!try_module_get(owner))
3427 return -ENODEV;
3428
3429 acquire_console_sem();
3430
3431 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3432 con_driver = &registered_con_driver[i];
3433
3434 /* already registered */
3435 if (con_driver->con == csw)
3436 retval = -EINVAL;
3437 }
3438
3439 if (retval)
3440 goto err;
3441
3442 desc = csw->con_startup();
3443
3444 if (!desc)
3445 goto err;
3446
3447 retval = -EINVAL;
3448
3449 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3450 con_driver = &registered_con_driver[i];
3451
3452 if (con_driver->con == NULL) {
3453 con_driver->con = csw;
3454 con_driver->desc = desc;
3455 con_driver->node = i;
3456 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3457 CON_DRIVER_FLAG_INIT;
3458 con_driver->first = first;
3459 con_driver->last = last;
3460 retval = 0;
3461 break;
3462 }
3463 }
3464
3465 if (retval)
3466 goto err;
3467
3468 con_driver->dev = device_create(vtconsole_class, NULL,
3469 MKDEV(0, con_driver->node),
3470 NULL, "vtcon%i",
3471 con_driver->node);
3472
3473 if (IS_ERR(con_driver->dev)) {
3474 printk(KERN_WARNING "Unable to create device for %s; "
3475 "errno = %ld\n", con_driver->desc,
3476 PTR_ERR(con_driver->dev));
3477 con_driver->dev = NULL;
3478 } else {
3479 vtconsole_init_device(con_driver);
3480 }
3481
3482 err:
3483 release_console_sem();
3484 module_put(owner);
3485 return retval;
3486 }
3487 EXPORT_SYMBOL(register_con_driver);
3488
3489 /**
3490 * unregister_con_driver - unregister console driver from console layer
3491 * @csw: console driver
3492 *
3493 * DESCRIPTION: All drivers that registers to the console layer must
3494 * call this function upon exit, or if the console driver is in a state
3495 * where it won't be able to handle console services, such as the
3496 * framebuffer console without loaded framebuffer drivers.
3497 *
3498 * The driver must unbind first prior to unregistration.
3499 */
3500 int unregister_con_driver(const struct consw *csw)
3501 {
3502 int i, retval = -ENODEV;
3503
3504 acquire_console_sem();
3505
3506 /* cannot unregister a bound driver */
3507 if (con_is_bound(csw))
3508 goto err;
3509
3510 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3511 struct con_driver *con_driver = &registered_con_driver[i];
3512
3513 if (con_driver->con == csw &&
3514 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3515 vtconsole_deinit_device(con_driver);
3516 device_destroy(vtconsole_class,
3517 MKDEV(0, con_driver->node));
3518 con_driver->con = NULL;
3519 con_driver->desc = NULL;
3520 con_driver->dev = NULL;
3521 con_driver->node = 0;
3522 con_driver->flag = 0;
3523 con_driver->first = 0;
3524 con_driver->last = 0;
3525 retval = 0;
3526 break;
3527 }
3528 }
3529 err:
3530 release_console_sem();
3531 return retval;
3532 }
3533 EXPORT_SYMBOL(unregister_con_driver);
3534
3535 /*
3536 * If we support more console drivers, this function is used
3537 * when a driver wants to take over some existing consoles
3538 * and become default driver for newly opened ones.
3539 *
3540 * take_over_console is basically a register followed by unbind
3541 */
3542 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3543 {
3544 int err;
3545
3546 err = register_con_driver(csw, first, last);
3547
3548 if (!err)
3549 bind_con_driver(csw, first, last, deflt);
3550
3551 return err;
3552 }
3553
3554 /*
3555 * give_up_console is a wrapper to unregister_con_driver. It will only
3556 * work if driver is fully unbound.
3557 */
3558 void give_up_console(const struct consw *csw)
3559 {
3560 unregister_con_driver(csw);
3561 }
3562
3563 static int __init vtconsole_class_init(void)
3564 {
3565 int i;
3566
3567 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3568 if (IS_ERR(vtconsole_class)) {
3569 printk(KERN_WARNING "Unable to create vt console class; "
3570 "errno = %ld\n", PTR_ERR(vtconsole_class));
3571 vtconsole_class = NULL;
3572 }
3573
3574 /* Add system drivers to sysfs */
3575 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3576 struct con_driver *con = &registered_con_driver[i];
3577
3578 if (con->con && !con->dev) {
3579 con->dev = device_create(vtconsole_class, NULL,
3580 MKDEV(0, con->node),
3581 NULL, "vtcon%i",
3582 con->node);
3583
3584 if (IS_ERR(con->dev)) {
3585 printk(KERN_WARNING "Unable to create "
3586 "device for %s; errno = %ld\n",
3587 con->desc, PTR_ERR(con->dev));
3588 con->dev = NULL;
3589 } else {
3590 vtconsole_init_device(con);
3591 }
3592 }
3593 }
3594
3595 return 0;
3596 }
3597 postcore_initcall(vtconsole_class_init);
3598
3599 #endif
3600
3601 /*
3602 * Screen blanking
3603 */
3604
3605 static int set_vesa_blanking(char __user *p)
3606 {
3607 unsigned int mode;
3608
3609 if (get_user(mode, p + 1))
3610 return -EFAULT;
3611
3612 vesa_blank_mode = (mode < 4) ? mode : 0;
3613 return 0;
3614 }
3615
3616 void do_blank_screen(int entering_gfx)
3617 {
3618 struct vc_data *vc = vc_cons[fg_console].d;
3619 int i;
3620
3621 WARN_CONSOLE_UNLOCKED();
3622
3623 if (console_blanked) {
3624 if (blank_state == blank_vesa_wait) {
3625 blank_state = blank_off;
3626 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3627 }
3628 return;
3629 }
3630
3631 /* entering graphics mode? */
3632 if (entering_gfx) {
3633 hide_cursor(vc);
3634 save_screen(vc);
3635 vc->vc_sw->con_blank(vc, -1, 1);
3636 console_blanked = fg_console + 1;
3637 blank_state = blank_off;
3638 set_origin(vc);
3639 return;
3640 }
3641
3642 if (blank_state != blank_normal_wait)
3643 return;
3644 blank_state = blank_off;
3645
3646 /* don't blank graphics */
3647 if (vc->vc_mode != KD_TEXT) {
3648 console_blanked = fg_console + 1;
3649 return;
3650 }
3651
3652 hide_cursor(vc);
3653 del_timer_sync(&console_timer);
3654 blank_timer_expired = 0;
3655
3656 save_screen(vc);
3657 /* In case we need to reset origin, blanking hook returns 1 */
3658 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3659 console_blanked = fg_console + 1;
3660 if (i)
3661 set_origin(vc);
3662
3663 if (console_blank_hook && console_blank_hook(1))
3664 return;
3665
3666 if (vesa_off_interval && vesa_blank_mode) {
3667 blank_state = blank_vesa_wait;
3668 mod_timer(&console_timer, jiffies + vesa_off_interval);
3669 }
3670 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3671 }
3672 EXPORT_SYMBOL(do_blank_screen);
3673
3674 /*
3675 * Called by timer as well as from vt_console_driver
3676 */
3677 void do_unblank_screen(int leaving_gfx)
3678 {
3679 struct vc_data *vc;
3680
3681 /* This should now always be called from a "sane" (read: can schedule)
3682 * context for the sake of the low level drivers, except in the special
3683 * case of oops_in_progress
3684 */
3685 if (!oops_in_progress)
3686 might_sleep();
3687
3688 WARN_CONSOLE_UNLOCKED();
3689
3690 ignore_poke = 0;
3691 if (!console_blanked)
3692 return;
3693 if (!vc_cons_allocated(fg_console)) {
3694 /* impossible */
3695 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3696 return;
3697 }
3698 vc = vc_cons[fg_console].d;
3699 if (vc->vc_mode != KD_TEXT)
3700 return; /* but leave console_blanked != 0 */
3701
3702 if (blankinterval) {
3703 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3704 blank_state = blank_normal_wait;
3705 }
3706
3707 console_blanked = 0;
3708 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3709 /* Low-level driver cannot restore -> do it ourselves */
3710 update_screen(vc);
3711 if (console_blank_hook)
3712 console_blank_hook(0);
3713 set_palette(vc);
3714 set_cursor(vc);
3715 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3716 }
3717 EXPORT_SYMBOL(do_unblank_screen);
3718
3719 /*
3720 * This is called by the outside world to cause a forced unblank, mostly for
3721 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3722 * call it with 1 as an argument and so force a mode restore... that may kill
3723 * X or at least garbage the screen but would also make the Oops visible...
3724 */
3725 void unblank_screen(void)
3726 {
3727 do_unblank_screen(0);
3728 }
3729
3730 /*
3731 * We defer the timer blanking to work queue so it can take the console mutex
3732 * (console operations can still happen at irq time, but only from printk which
3733 * has the console mutex. Not perfect yet, but better than no locking
3734 */
3735 static void blank_screen_t(unsigned long dummy)
3736 {
3737 if (unlikely(!keventd_up())) {
3738 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3739 return;
3740 }
3741 blank_timer_expired = 1;
3742 schedule_work(&console_work);
3743 }
3744
3745 void poke_blanked_console(void)
3746 {
3747 WARN_CONSOLE_UNLOCKED();
3748
3749 /* Add this so we quickly catch whoever might call us in a non
3750 * safe context. Nowadays, unblank_screen() isn't to be called in
3751 * atomic contexts and is allowed to schedule (with the special case
3752 * of oops_in_progress, but that isn't of any concern for this
3753 * function. --BenH.
3754 */
3755 might_sleep();
3756
3757 /* This isn't perfectly race free, but a race here would be mostly harmless,
3758 * at worse, we'll do a spurrious blank and it's unlikely
3759 */
3760 del_timer(&console_timer);
3761 blank_timer_expired = 0;
3762
3763 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3764 return;
3765 if (console_blanked)
3766 unblank_screen();
3767 else if (blankinterval) {
3768 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3769 blank_state = blank_normal_wait;
3770 }
3771 }
3772
3773 /*
3774 * Palettes
3775 */
3776
3777 static void set_palette(struct vc_data *vc)
3778 {
3779 WARN_CONSOLE_UNLOCKED();
3780
3781 if (vc->vc_mode != KD_GRAPHICS)
3782 vc->vc_sw->con_set_palette(vc, color_table);
3783 }
3784
3785 static int set_get_cmap(unsigned char __user *arg, int set)
3786 {
3787 int i, j, k;
3788
3789 WARN_CONSOLE_UNLOCKED();
3790
3791 for (i = 0; i < 16; i++)
3792 if (set) {
3793 get_user(default_red[i], arg++);
3794 get_user(default_grn[i], arg++);
3795 get_user(default_blu[i], arg++);
3796 } else {
3797 put_user(default_red[i], arg++);
3798 put_user(default_grn[i], arg++);
3799 put_user(default_blu[i], arg++);
3800 }
3801 if (set) {
3802 for (i = 0; i < MAX_NR_CONSOLES; i++)
3803 if (vc_cons_allocated(i)) {
3804 for (j = k = 0; j < 16; j++) {
3805 vc_cons[i].d->vc_palette[k++] = default_red[j];
3806 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3807 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3808 }
3809 set_palette(vc_cons[i].d);
3810 }
3811 }
3812 return 0;
3813 }
3814
3815 /*
3816 * Load palette into the DAC registers. arg points to a colour
3817 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3818 */
3819
3820 int con_set_cmap(unsigned char __user *arg)
3821 {
3822 int rc;
3823
3824 acquire_console_sem();
3825 rc = set_get_cmap (arg,1);
3826 release_console_sem();
3827
3828 return rc;
3829 }
3830
3831 int con_get_cmap(unsigned char __user *arg)
3832 {
3833 int rc;
3834
3835 acquire_console_sem();
3836 rc = set_get_cmap (arg,0);
3837 release_console_sem();
3838
3839 return rc;
3840 }
3841
3842 void reset_palette(struct vc_data *vc)
3843 {
3844 int j, k;
3845 for (j=k=0; j<16; j++) {
3846 vc->vc_palette[k++] = default_red[j];
3847 vc->vc_palette[k++] = default_grn[j];
3848 vc->vc_palette[k++] = default_blu[j];
3849 }
3850 set_palette(vc);
3851 }
3852
3853 /*
3854 * Font switching
3855 *
3856 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3857 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3858 * depending on width) reserved for each character which is kinda wasty, but
3859 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3860 * is upto the actual low-level console-driver convert data into its favorite
3861 * format (maybe we should add a `fontoffset' field to the `display'
3862 * structure so we won't have to convert the fontdata all the time.
3863 * /Jes
3864 */
3865
3866 #define max_font_size 65536
3867
3868 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3869 {
3870 struct console_font font;
3871 int rc = -EINVAL;
3872 int c;
3873
3874 if (vc->vc_mode != KD_TEXT)
3875 return -EINVAL;
3876
3877 if (op->data) {
3878 font.data = kmalloc(max_font_size, GFP_KERNEL);
3879 if (!font.data)
3880 return -ENOMEM;
3881 } else
3882 font.data = NULL;
3883
3884 acquire_console_sem();
3885 if (vc->vc_sw->con_font_get)
3886 rc = vc->vc_sw->con_font_get(vc, &font);
3887 else
3888 rc = -ENOSYS;
3889 release_console_sem();
3890
3891 if (rc)
3892 goto out;
3893
3894 c = (font.width+7)/8 * 32 * font.charcount;
3895
3896 if (op->data && font.charcount > op->charcount)
3897 rc = -ENOSPC;
3898 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3899 if (font.width > op->width || font.height > op->height)
3900 rc = -ENOSPC;
3901 } else {
3902 if (font.width != 8)
3903 rc = -EIO;
3904 else if ((op->height && font.height > op->height) ||
3905 font.height > 32)
3906 rc = -ENOSPC;
3907 }
3908 if (rc)
3909 goto out;
3910
3911 op->height = font.height;
3912 op->width = font.width;
3913 op->charcount = font.charcount;
3914
3915 if (op->data && copy_to_user(op->data, font.data, c))
3916 rc = -EFAULT;
3917
3918 out:
3919 kfree(font.data);
3920 return rc;
3921 }
3922
3923 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3924 {
3925 struct console_font font;
3926 int rc = -EINVAL;
3927 int size;
3928
3929 if (vc->vc_mode != KD_TEXT)
3930 return -EINVAL;
3931 if (!op->data)
3932 return -EINVAL;
3933 if (op->charcount > 512)
3934 return -EINVAL;
3935 if (!op->height) { /* Need to guess font height [compat] */
3936 int h, i;
3937 u8 __user *charmap = op->data;
3938 u8 tmp;
3939
3940 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3941 so that we can get rid of this soon */
3942 if (!(op->flags & KD_FONT_FLAG_OLD))
3943 return -EINVAL;
3944 for (h = 32; h > 0; h--)
3945 for (i = 0; i < op->charcount; i++) {
3946 if (get_user(tmp, &charmap[32*i+h-1]))
3947 return -EFAULT;
3948 if (tmp)
3949 goto nonzero;
3950 }
3951 return -EINVAL;
3952 nonzero:
3953 op->height = h;
3954 }
3955 if (op->width <= 0 || op->width > 32 || op->height > 32)
3956 return -EINVAL;
3957 size = (op->width+7)/8 * 32 * op->charcount;
3958 if (size > max_font_size)
3959 return -ENOSPC;
3960 font.charcount = op->charcount;
3961 font.height = op->height;
3962 font.width = op->width;
3963 font.data = kmalloc(size, GFP_KERNEL);
3964 if (!font.data)
3965 return -ENOMEM;
3966 if (copy_from_user(font.data, op->data, size)) {
3967 kfree(font.data);
3968 return -EFAULT;
3969 }
3970 acquire_console_sem();
3971 if (vc->vc_sw->con_font_set)
3972 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3973 else
3974 rc = -ENOSYS;
3975 release_console_sem();
3976 kfree(font.data);
3977 return rc;
3978 }
3979
3980 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3981 {
3982 struct console_font font = {.width = op->width, .height = op->height};
3983 char name[MAX_FONT_NAME];
3984 char *s = name;
3985 int rc;
3986
3987 if (vc->vc_mode != KD_TEXT)
3988 return -EINVAL;
3989
3990 if (!op->data)
3991 s = NULL;
3992 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3993 return -EFAULT;
3994 else
3995 name[MAX_FONT_NAME - 1] = 0;
3996
3997 acquire_console_sem();
3998 if (vc->vc_sw->con_font_default)
3999 rc = vc->vc_sw->con_font_default(vc, &font, s);
4000 else
4001 rc = -ENOSYS;
4002 release_console_sem();
4003 if (!rc) {
4004 op->width = font.width;
4005 op->height = font.height;
4006 }
4007 return rc;
4008 }
4009
4010 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4011 {
4012 int con = op->height;
4013 int rc;
4014
4015 if (vc->vc_mode != KD_TEXT)
4016 return -EINVAL;
4017
4018 acquire_console_sem();
4019 if (!vc->vc_sw->con_font_copy)
4020 rc = -ENOSYS;
4021 else if (con < 0 || !vc_cons_allocated(con))
4022 rc = -ENOTTY;
4023 else if (con == vc->vc_num) /* nothing to do */
4024 rc = 0;
4025 else
4026 rc = vc->vc_sw->con_font_copy(vc, con);
4027 release_console_sem();
4028 return rc;
4029 }
4030
4031 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4032 {
4033 switch (op->op) {
4034 case KD_FONT_OP_SET:
4035 return con_font_set(vc, op);
4036 case KD_FONT_OP_GET:
4037 return con_font_get(vc, op);
4038 case KD_FONT_OP_SET_DEFAULT:
4039 return con_font_default(vc, op);
4040 case KD_FONT_OP_COPY:
4041 return con_font_copy(vc, op);
4042 }
4043 return -ENOSYS;
4044 }
4045
4046 /*
4047 * Interface exported to selection and vcs.
4048 */
4049
4050 /* used by selection */
4051 u16 screen_glyph(struct vc_data *vc, int offset)
4052 {
4053 u16 w = scr_readw(screenpos(vc, offset, 1));
4054 u16 c = w & 0xff;
4055
4056 if (w & vc->vc_hi_font_mask)
4057 c |= 0x100;
4058 return c;
4059 }
4060 EXPORT_SYMBOL_GPL(screen_glyph);
4061
4062 /* used by vcs - note the word offset */
4063 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4064 {
4065 return screenpos(vc, 2 * w_offset, viewed);
4066 }
4067
4068 void getconsxy(struct vc_data *vc, unsigned char *p)
4069 {
4070 p[0] = vc->vc_x;
4071 p[1] = vc->vc_y;
4072 }
4073
4074 void putconsxy(struct vc_data *vc, unsigned char *p)
4075 {
4076 hide_cursor(vc);
4077 gotoxy(vc, p[0], p[1]);
4078 set_cursor(vc);
4079 }
4080
4081 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4082 {
4083 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4084 return softcursor_original;
4085 return scr_readw(org);
4086 }
4087
4088 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4089 {
4090 scr_writew(val, org);
4091 if ((unsigned long)org == vc->vc_pos) {
4092 softcursor_original = -1;
4093 add_softcursor(vc);
4094 }
4095 }
4096
4097 /*
4098 * Visible symbols for modules
4099 */
4100
4101 EXPORT_SYMBOL(color_table);
4102 EXPORT_SYMBOL(default_red);
4103 EXPORT_SYMBOL(default_grn);
4104 EXPORT_SYMBOL(default_blu);
4105 EXPORT_SYMBOL(update_region);
4106 EXPORT_SYMBOL(redraw_screen);
4107 EXPORT_SYMBOL(vc_resize);
4108 EXPORT_SYMBOL(fg_console);
4109 EXPORT_SYMBOL(console_blank_hook);
4110 EXPORT_SYMBOL(console_blanked);
4111 EXPORT_SYMBOL(vc_cons);
4112 #ifndef VT_SINGLE_DRIVER
4113 EXPORT_SYMBOL(take_over_console);
4114 EXPORT_SYMBOL(give_up_console);
4115 #endif
mm of the moment repository