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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / char / vt.c
blobbd1d1164fec5a49feb20cab71cbfbba51233ed9e
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 int global_cursor_default = -1;
165 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
166
167 static int cur_default = CUR_DEFAULT;
168 module_param(cur_default, int, S_IRUGO | S_IWUSR);
169
170 /*
171 * ignore_poke: don't unblank the screen when things are typed. This is
172 * mainly for the privacy of braille terminal users.
173 */
174 static int ignore_poke;
175
176 int do_poke_blanked_console;
177 int console_blanked;
178
179 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
180 static int vesa_off_interval;
181 static int blankinterval = 10*60;
182 core_param(consoleblank, blankinterval, int, 0444);
183
184 static DECLARE_WORK(console_work, console_callback);
185
186 /*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 */
191 int fg_console;
192 int last_console;
193 int want_console = -1;
194
195 /*
196 * For each existing display, we have a pointer to console currently visible
197 * on that display, allowing consoles other than fg_console to be refreshed
198 * appropriately. Unless the low-level driver supplies its own display_fg
199 * variable, we use this one for the "master display".
200 */
201 static struct vc_data *master_display_fg;
202
203 /*
204 * Unfortunately, we need to delay tty echo when we're currently writing to the
205 * console since the code is (and always was) not re-entrant, so we schedule
206 * all flip requests to process context with schedule-task() and run it from
207 * console_callback().
208 */
209
210 /*
211 * For the same reason, we defer scrollback to the console callback.
212 */
213 static int scrollback_delta;
214
215 /*
216 * Hook so that the power management routines can (un)blank
217 * the console on our behalf.
218 */
219 int (*console_blank_hook)(int);
220
221 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
222 static int blank_state;
223 static int blank_timer_expired;
224 enum {
225 blank_off = 0,
226 blank_normal_wait,
227 blank_vesa_wait,
228 };
229
230 /*
231 * Notifier list for console events.
232 */
233 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
234
235 int register_vt_notifier(struct notifier_block *nb)
236 {
237 return atomic_notifier_chain_register(&vt_notifier_list, nb);
238 }
239 EXPORT_SYMBOL_GPL(register_vt_notifier);
240
241 int unregister_vt_notifier(struct notifier_block *nb)
242 {
243 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
244 }
245 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
246
247 static void notify_write(struct vc_data *vc, unsigned int unicode)
248 {
249 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
250 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
251 }
252
253 static void notify_update(struct vc_data *vc)
254 {
255 struct vt_notifier_param param = { .vc = vc };
256 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
257 }
258 /*
259 * Low-Level Functions
260 */
261
262 #define IS_FG(vc) ((vc)->vc_num == fg_console)
263
264 #ifdef VT_BUF_VRAM_ONLY
265 #define DO_UPDATE(vc) 0
266 #else
267 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
268 #endif
269
270 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
271 {
272 unsigned short *p;
273
274 if (!viewed)
275 p = (unsigned short *)(vc->vc_origin + offset);
276 else if (!vc->vc_sw->con_screen_pos)
277 p = (unsigned short *)(vc->vc_visible_origin + offset);
278 else
279 p = vc->vc_sw->con_screen_pos(vc, offset);
280 return p;
281 }
282
283 static inline void scrolldelta(int lines)
284 {
285 scrollback_delta += lines;
286 schedule_console_callback();
287 }
288
289 void schedule_console_callback(void)
290 {
291 schedule_work(&console_work);
292 }
293
294 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
295 {
296 unsigned short *d, *s;
297
298 if (t+nr >= b)
299 nr = b - t - 1;
300 if (b > vc->vc_rows || t >= b || nr < 1)
301 return;
302 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
303 return;
304 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
305 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
306 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
307 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
308 vc->vc_size_row * nr);
309 }
310
311 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
312 {
313 unsigned short *s;
314 unsigned int step;
315
316 if (t+nr >= b)
317 nr = b - t - 1;
318 if (b > vc->vc_rows || t >= b || nr < 1)
319 return;
320 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
321 return;
322 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
323 step = vc->vc_cols * nr;
324 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
325 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
326 }
327
328 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
329 {
330 #ifndef VT_BUF_VRAM_ONLY
331 unsigned int xx, yy, offset;
332 u16 *p;
333
334 p = (u16 *) start;
335 if (!vc->vc_sw->con_getxy) {
336 offset = (start - vc->vc_origin) / 2;
337 xx = offset % vc->vc_cols;
338 yy = offset / vc->vc_cols;
339 } else {
340 int nxx, nyy;
341 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
342 xx = nxx; yy = nyy;
343 }
344 for(;;) {
345 u16 attrib = scr_readw(p) & 0xff00;
346 int startx = xx;
347 u16 *q = p;
348 while (xx < vc->vc_cols && count) {
349 if (attrib != (scr_readw(p) & 0xff00)) {
350 if (p > q)
351 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
352 startx = xx;
353 q = p;
354 attrib = scr_readw(p) & 0xff00;
355 }
356 p++;
357 xx++;
358 count--;
359 }
360 if (p > q)
361 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
362 if (!count)
363 break;
364 xx = 0;
365 yy++;
366 if (vc->vc_sw->con_getxy) {
367 p = (u16 *)start;
368 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
369 }
370 }
371 #endif
372 }
373
374 void update_region(struct vc_data *vc, unsigned long start, int count)
375 {
376 WARN_CONSOLE_UNLOCKED();
377
378 if (DO_UPDATE(vc)) {
379 hide_cursor(vc);
380 do_update_region(vc, start, count);
381 set_cursor(vc);
382 }
383 }
384
385 /* Structure of attributes is hardware-dependent */
386
387 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
388 u8 _underline, u8 _reverse, u8 _italic)
389 {
390 if (vc->vc_sw->con_build_attr)
391 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
392 _blink, _underline, _reverse, _italic);
393
394 #ifndef VT_BUF_VRAM_ONLY
395 /*
396 * ++roman: I completely changed the attribute format for monochrome
397 * mode (!can_do_color). The formerly used MDA (monochrome display
398 * adapter) format didn't allow the combination of certain effects.
399 * Now the attribute is just a bit vector:
400 * Bit 0..1: intensity (0..2)
401 * Bit 2 : underline
402 * Bit 3 : reverse
403 * Bit 7 : blink
404 */
405 {
406 u8 a = _color;
407 if (!vc->vc_can_do_color)
408 return _intensity |
409 (_italic ? 2 : 0) |
410 (_underline ? 4 : 0) |
411 (_reverse ? 8 : 0) |
412 (_blink ? 0x80 : 0);
413 if (_italic)
414 a = (a & 0xF0) | vc->vc_itcolor;
415 else if (_underline)
416 a = (a & 0xf0) | vc->vc_ulcolor;
417 else if (_intensity == 0)
418 a = (a & 0xf0) | vc->vc_ulcolor;
419 if (_reverse)
420 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
421 if (_blink)
422 a ^= 0x80;
423 if (_intensity == 2)
424 a ^= 0x08;
425 if (vc->vc_hi_font_mask == 0x100)
426 a <<= 1;
427 return a;
428 }
429 #else
430 return 0;
431 #endif
432 }
433
434 static void update_attr(struct vc_data *vc)
435 {
436 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
437 vc->vc_blink, vc->vc_underline,
438 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
439 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
440 }
441
442 /* Note: inverting the screen twice should revert to the original state */
443 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
444 {
445 unsigned short *p;
446
447 WARN_CONSOLE_UNLOCKED();
448
449 count /= 2;
450 p = screenpos(vc, offset, viewed);
451 if (vc->vc_sw->con_invert_region)
452 vc->vc_sw->con_invert_region(vc, p, count);
453 #ifndef VT_BUF_VRAM_ONLY
454 else {
455 u16 *q = p;
456 int cnt = count;
457 u16 a;
458
459 if (!vc->vc_can_do_color) {
460 while (cnt--) {
461 a = scr_readw(q);
462 a ^= 0x0800;
463 scr_writew(a, q);
464 q++;
465 }
466 } else if (vc->vc_hi_font_mask == 0x100) {
467 while (cnt--) {
468 a = scr_readw(q);
469 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
470 scr_writew(a, q);
471 q++;
472 }
473 } else {
474 while (cnt--) {
475 a = scr_readw(q);
476 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
477 scr_writew(a, q);
478 q++;
479 }
480 }
481 }
482 #endif
483 if (DO_UPDATE(vc))
484 do_update_region(vc, (unsigned long) p, count);
485 }
486
487 /* used by selection: complement pointer position */
488 void complement_pos(struct vc_data *vc, int offset)
489 {
490 static int old_offset = -1;
491 static unsigned short old;
492 static unsigned short oldx, oldy;
493
494 WARN_CONSOLE_UNLOCKED();
495
496 if (old_offset != -1 && old_offset >= 0 &&
497 old_offset < vc->vc_screenbuf_size) {
498 scr_writew(old, screenpos(vc, old_offset, 1));
499 if (DO_UPDATE(vc))
500 vc->vc_sw->con_putc(vc, old, oldy, oldx);
501 }
502
503 old_offset = offset;
504
505 if (offset != -1 && offset >= 0 &&
506 offset < vc->vc_screenbuf_size) {
507 unsigned short new;
508 unsigned short *p;
509 p = screenpos(vc, offset, 1);
510 old = scr_readw(p);
511 new = old ^ vc->vc_complement_mask;
512 scr_writew(new, p);
513 if (DO_UPDATE(vc)) {
514 oldx = (offset >> 1) % vc->vc_cols;
515 oldy = (offset >> 1) / vc->vc_cols;
516 vc->vc_sw->con_putc(vc, new, oldy, oldx);
517 }
518 }
519
520 }
521
522 static void insert_char(struct vc_data *vc, unsigned int nr)
523 {
524 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
525
526 p = q + vc->vc_cols - nr - vc->vc_x;
527 while (--p >= q)
528 scr_writew(scr_readw(p), p + nr);
529 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
530 vc->vc_need_wrap = 0;
531 if (DO_UPDATE(vc)) {
532 unsigned short oldattr = vc->vc_attr;
533 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
534 vc->vc_cols - vc->vc_x - nr);
535 vc->vc_attr = vc->vc_video_erase_char >> 8;
536 while (nr--)
537 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
538 vc->vc_attr = oldattr;
539 }
540 }
541
542 static void delete_char(struct vc_data *vc, unsigned int nr)
543 {
544 unsigned int i = vc->vc_x;
545 unsigned short *p = (unsigned short *)vc->vc_pos;
546
547 while (++i <= vc->vc_cols - nr) {
548 scr_writew(scr_readw(p+nr), p);
549 p++;
550 }
551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
552 vc->vc_need_wrap = 0;
553 if (DO_UPDATE(vc)) {
554 unsigned short oldattr = vc->vc_attr;
555 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
556 vc->vc_cols - vc->vc_x - nr);
557 vc->vc_attr = vc->vc_video_erase_char >> 8;
558 while (nr--)
559 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
560 vc->vc_cols - 1 - nr);
561 vc->vc_attr = oldattr;
562 }
563 }
564
565 static int softcursor_original;
566
567 static void add_softcursor(struct vc_data *vc)
568 {
569 int i = scr_readw((u16 *) vc->vc_pos);
570 u32 type = vc->vc_cursor_type;
571
572 if (! (type & 0x10)) return;
573 if (softcursor_original != -1) return;
574 softcursor_original = i;
575 i |= ((type >> 8) & 0xff00 );
576 i ^= ((type) & 0xff00 );
577 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
578 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
579 scr_writew(i, (u16 *) vc->vc_pos);
580 if (DO_UPDATE(vc))
581 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
582 }
583
584 static void hide_softcursor(struct vc_data *vc)
585 {
586 if (softcursor_original != -1) {
587 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
588 if (DO_UPDATE(vc))
589 vc->vc_sw->con_putc(vc, softcursor_original,
590 vc->vc_y, vc->vc_x);
591 softcursor_original = -1;
592 }
593 }
594
595 static void hide_cursor(struct vc_data *vc)
596 {
597 if (vc == sel_cons)
598 clear_selection();
599 vc->vc_sw->con_cursor(vc, CM_ERASE);
600 hide_softcursor(vc);
601 }
602
603 static void set_cursor(struct vc_data *vc)
604 {
605 if (!IS_FG(vc) || console_blanked ||
606 vc->vc_mode == KD_GRAPHICS)
607 return;
608 if (vc->vc_deccm) {
609 if (vc == sel_cons)
610 clear_selection();
611 add_softcursor(vc);
612 if ((vc->vc_cursor_type & 0x0f) != 1)
613 vc->vc_sw->con_cursor(vc, CM_DRAW);
614 } else
615 hide_cursor(vc);
616 }
617
618 static void set_origin(struct vc_data *vc)
619 {
620 WARN_CONSOLE_UNLOCKED();
621
622 if (!CON_IS_VISIBLE(vc) ||
623 !vc->vc_sw->con_set_origin ||
624 !vc->vc_sw->con_set_origin(vc))
625 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
626 vc->vc_visible_origin = vc->vc_origin;
627 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
628 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
629 }
630
631 static inline void save_screen(struct vc_data *vc)
632 {
633 WARN_CONSOLE_UNLOCKED();
634
635 if (vc->vc_sw->con_save_screen)
636 vc->vc_sw->con_save_screen(vc);
637 }
638
639 /*
640 * Redrawing of screen
641 */
642
643 static void clear_buffer_attributes(struct vc_data *vc)
644 {
645 unsigned short *p = (unsigned short *)vc->vc_origin;
646 int count = vc->vc_screenbuf_size / 2;
647 int mask = vc->vc_hi_font_mask | 0xff;
648
649 for (; count > 0; count--, p++) {
650 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
651 }
652 }
653
654 void redraw_screen(struct vc_data *vc, int is_switch)
655 {
656 int redraw = 0;
657
658 WARN_CONSOLE_UNLOCKED();
659
660 if (!vc) {
661 /* strange ... */
662 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
663 return;
664 }
665
666 if (is_switch) {
667 struct vc_data *old_vc = vc_cons[fg_console].d;
668 if (old_vc == vc)
669 return;
670 if (!CON_IS_VISIBLE(vc))
671 redraw = 1;
672 *vc->vc_display_fg = vc;
673 fg_console = vc->vc_num;
674 hide_cursor(old_vc);
675 if (!CON_IS_VISIBLE(old_vc)) {
676 save_screen(old_vc);
677 set_origin(old_vc);
678 }
679 } else {
680 hide_cursor(vc);
681 redraw = 1;
682 }
683
684 if (redraw) {
685 int update;
686 int old_was_color = vc->vc_can_do_color;
687
688 set_origin(vc);
689 update = vc->vc_sw->con_switch(vc);
690 set_palette(vc);
691 /*
692 * If console changed from mono<->color, the best we can do
693 * is to clear the buffer attributes. As it currently stands,
694 * rebuilding new attributes from the old buffer is not doable
695 * without overly complex code.
696 */
697 if (old_was_color != vc->vc_can_do_color) {
698 update_attr(vc);
699 clear_buffer_attributes(vc);
700 }
701 if (update && vc->vc_mode != KD_GRAPHICS)
702 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
703 }
704 set_cursor(vc);
705 if (is_switch) {
706 set_leds();
707 compute_shiftstate();
708 notify_update(vc);
709 }
710 }
711
712 /*
713 * Allocation, freeing and resizing of VTs.
714 */
715
716 int vc_cons_allocated(unsigned int i)
717 {
718 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
719 }
720
721 static void visual_init(struct vc_data *vc, int num, int init)
722 {
723 /* ++Geert: vc->vc_sw->con_init determines console size */
724 if (vc->vc_sw)
725 module_put(vc->vc_sw->owner);
726 vc->vc_sw = conswitchp;
727 #ifndef VT_SINGLE_DRIVER
728 if (con_driver_map[num])
729 vc->vc_sw = con_driver_map[num];
730 #endif
731 __module_get(vc->vc_sw->owner);
732 vc->vc_num = num;
733 vc->vc_display_fg = &master_display_fg;
734 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
735 vc->vc_uni_pagedir = 0;
736 vc->vc_hi_font_mask = 0;
737 vc->vc_complement_mask = 0;
738 vc->vc_can_do_color = 0;
739 vc->vc_sw->con_init(vc, init);
740 if (!vc->vc_complement_mask)
741 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
742 vc->vc_s_complement_mask = vc->vc_complement_mask;
743 vc->vc_size_row = vc->vc_cols << 1;
744 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
745 }
746
747 int vc_allocate(unsigned int currcons) /* return 0 on success */
748 {
749 WARN_CONSOLE_UNLOCKED();
750
751 if (currcons >= MAX_NR_CONSOLES)
752 return -ENXIO;
753 if (!vc_cons[currcons].d) {
754 struct vc_data *vc;
755 struct vt_notifier_param param;
756
757 /* prevent users from taking too much memory */
758 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
759 return -EPERM;
760
761 /* due to the granularity of kmalloc, we waste some memory here */
762 /* the alloc is done in two steps, to optimize the common situation
763 of a 25x80 console (structsize=216, screenbuf_size=4000) */
764 /* although the numbers above are not valid since long ago, the
765 point is still up-to-date and the comment still has its value
766 even if only as a historical artifact. --mj, July 1998 */
767 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
768 if (!vc)
769 return -ENOMEM;
770 vc_cons[currcons].d = vc;
771 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
772 visual_init(vc, currcons, 1);
773 if (!*vc->vc_uni_pagedir_loc)
774 con_set_default_unimap(vc);
775 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
776 if (!vc->vc_screenbuf) {
777 kfree(vc);
778 vc_cons[currcons].d = NULL;
779 return -ENOMEM;
780 }
781
782 /* If no drivers have overridden us and the user didn't pass a
783 boot option, default to displaying the cursor */
784 if (global_cursor_default == -1)
785 global_cursor_default = 1;
786
787 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
788 vcs_make_sysfs(currcons);
789 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
790 }
791 return 0;
792 }
793
794 static inline int resize_screen(struct vc_data *vc, int width, int height,
795 int user)
796 {
797 /* Resizes the resolution of the display adapater */
798 int err = 0;
799
800 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
801 err = vc->vc_sw->con_resize(vc, width, height, user);
802
803 return err;
804 }
805
806 /*
807 * Change # of rows and columns (0 means unchanged/the size of fg_console)
808 * [this is to be used together with some user program
809 * like resize that changes the hardware videomode]
810 */
811 #define VC_RESIZE_MAXCOL (32767)
812 #define VC_RESIZE_MAXROW (32767)
813
814 /**
815 * vc_do_resize - resizing method for the tty
816 * @tty: tty being resized
817 * @real_tty: real tty (different to tty if a pty/tty pair)
818 * @vc: virtual console private data
819 * @cols: columns
820 * @lines: lines
821 *
822 * Resize a virtual console, clipping according to the actual constraints.
823 * If the caller passes a tty structure then update the termios winsize
824 * information and perform any necessary signal handling.
825 *
826 * Caller must hold the console semaphore. Takes the termios mutex and
827 * ctrl_lock of the tty IFF a tty is passed.
828 */
829
830 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
831 unsigned int cols, unsigned int lines)
832 {
833 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
834 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
835 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
836 unsigned int end, user;
837 unsigned short *newscreen;
838
839 WARN_CONSOLE_UNLOCKED();
840
841 if (!vc)
842 return -ENXIO;
843
844 user = vc->vc_resize_user;
845 vc->vc_resize_user = 0;
846
847 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
848 return -EINVAL;
849
850 new_cols = (cols ? cols : vc->vc_cols);
851 new_rows = (lines ? lines : vc->vc_rows);
852 new_row_size = new_cols << 1;
853 new_screen_size = new_row_size * new_rows;
854
855 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
856 return 0;
857
858 newscreen = kmalloc(new_screen_size, GFP_USER);
859 if (!newscreen)
860 return -ENOMEM;
861
862 old_rows = vc->vc_rows;
863 old_cols = vc->vc_cols;
864 old_row_size = vc->vc_size_row;
865 old_screen_size = vc->vc_screenbuf_size;
866
867 err = resize_screen(vc, new_cols, new_rows, user);
868 if (err) {
869 kfree(newscreen);
870 return err;
871 }
872
873 vc->vc_rows = new_rows;
874 vc->vc_cols = new_cols;
875 vc->vc_size_row = new_row_size;
876 vc->vc_screenbuf_size = new_screen_size;
877
878 rlth = min(old_row_size, new_row_size);
879 rrem = new_row_size - rlth;
880 old_origin = vc->vc_origin;
881 new_origin = (long) newscreen;
882 new_scr_end = new_origin + new_screen_size;
883
884 if (vc->vc_y > new_rows) {
885 if (old_rows - vc->vc_y < new_rows) {
886 /*
887 * Cursor near the bottom, copy contents from the
888 * bottom of buffer
889 */
890 old_origin += (old_rows - new_rows) * old_row_size;
891 end = vc->vc_scr_end;
892 } else {
893 /*
894 * Cursor is in no man's land, copy 1/2 screenful
895 * from the top and bottom of cursor position
896 */
897 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
898 end = old_origin + (old_row_size * new_rows);
899 }
900 } else
901 /*
902 * Cursor near the top, copy contents from the top of buffer
903 */
904 end = (old_rows > new_rows) ? old_origin +
905 (old_row_size * new_rows) :
906 vc->vc_scr_end;
907
908 update_attr(vc);
909
910 while (old_origin < end) {
911 scr_memcpyw((unsigned short *) new_origin,
912 (unsigned short *) old_origin, rlth);
913 if (rrem)
914 scr_memsetw((void *)(new_origin + rlth),
915 vc->vc_video_erase_char, rrem);
916 old_origin += old_row_size;
917 new_origin += new_row_size;
918 }
919 if (new_scr_end > new_origin)
920 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
921 new_scr_end - new_origin);
922 kfree(vc->vc_screenbuf);
923 vc->vc_screenbuf = newscreen;
924 vc->vc_screenbuf_size = new_screen_size;
925 set_origin(vc);
926
927 /* do part of a reset_terminal() */
928 vc->vc_top = 0;
929 vc->vc_bottom = vc->vc_rows;
930 gotoxy(vc, vc->vc_x, vc->vc_y);
931 save_cur(vc);
932
933 if (tty) {
934 /* Rewrite the requested winsize data with the actual
935 resulting sizes */
936 struct winsize ws;
937 memset(&ws, 0, sizeof(ws));
938 ws.ws_row = vc->vc_rows;
939 ws.ws_col = vc->vc_cols;
940 ws.ws_ypixel = vc->vc_scan_lines;
941 tty_do_resize(tty, &ws);
942 }
943
944 if (CON_IS_VISIBLE(vc))
945 update_screen(vc);
946 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
947 return err;
948 }
949
950 /**
951 * vc_resize - resize a VT
952 * @vc: virtual console
953 * @cols: columns
954 * @rows: rows
955 *
956 * Resize a virtual console as seen from the console end of things. We
957 * use the common vc_do_resize methods to update the structures. The
958 * caller must hold the console sem to protect console internals and
959 * vc->vc_tty
960 */
961
962 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
963 {
964 return vc_do_resize(vc->vc_tty, vc, cols, rows);
965 }
966
967 /**
968 * vt_resize - resize a VT
969 * @tty: tty to resize
970 * @ws: winsize attributes
971 *
972 * Resize a virtual terminal. This is called by the tty layer as we
973 * register our own handler for resizing. The mutual helper does all
974 * the actual work.
975 *
976 * Takes the console sem and the called methods then take the tty
977 * termios_mutex and the tty ctrl_lock in that order.
978 */
979 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
980 {
981 struct vc_data *vc = tty->driver_data;
982 int ret;
983
984 acquire_console_sem();
985 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
986 release_console_sem();
987 return ret;
988 }
989
990 void vc_deallocate(unsigned int currcons)
991 {
992 WARN_CONSOLE_UNLOCKED();
993
994 if (vc_cons_allocated(currcons)) {
995 struct vc_data *vc = vc_cons[currcons].d;
996 struct vt_notifier_param param = { .vc = vc };
997
998 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
999 vcs_remove_sysfs(currcons);
1000 vc->vc_sw->con_deinit(vc);
1001 put_pid(vc->vt_pid);
1002 module_put(vc->vc_sw->owner);
1003 kfree(vc->vc_screenbuf);
1004 if (currcons >= MIN_NR_CONSOLES)
1005 kfree(vc);
1006 vc_cons[currcons].d = NULL;
1007 }
1008 }
1009
1010 /*
1011 * VT102 emulator
1012 */
1013
1014 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1015 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1016 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1017
1018 #define decarm VC_REPEAT
1019 #define decckm VC_CKMODE
1020 #define kbdapplic VC_APPLIC
1021 #define lnm VC_CRLF
1022
1023 /*
1024 * this is what the terminal answers to a ESC-Z or csi0c query.
1025 */
1026 #define VT100ID "\033[?1;2c"
1027 #define VT102ID "\033[?6c"
1028
1029 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1030 8,12,10,14, 9,13,11,15 };
1031
1032 /* the default colour table, for VGA+ colour systems */
1033 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1034 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1035 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1036 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1037 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1038 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1039
1040 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1042 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1043
1044 /*
1045 * gotoxy() must verify all boundaries, because the arguments
1046 * might also be negative. If the given position is out of
1047 * bounds, the cursor is placed at the nearest margin.
1048 */
1049 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1050 {
1051 int min_y, max_y;
1052
1053 if (new_x < 0)
1054 vc->vc_x = 0;
1055 else {
1056 if (new_x >= vc->vc_cols)
1057 vc->vc_x = vc->vc_cols - 1;
1058 else
1059 vc->vc_x = new_x;
1060 }
1061
1062 if (vc->vc_decom) {
1063 min_y = vc->vc_top;
1064 max_y = vc->vc_bottom;
1065 } else {
1066 min_y = 0;
1067 max_y = vc->vc_rows;
1068 }
1069 if (new_y < min_y)
1070 vc->vc_y = min_y;
1071 else if (new_y >= max_y)
1072 vc->vc_y = max_y - 1;
1073 else
1074 vc->vc_y = new_y;
1075 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1076 vc->vc_need_wrap = 0;
1077 }
1078
1079 /* for absolute user moves, when decom is set */
1080 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1081 {
1082 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1083 }
1084
1085 void scrollback(struct vc_data *vc, int lines)
1086 {
1087 if (!lines)
1088 lines = vc->vc_rows / 2;
1089 scrolldelta(-lines);
1090 }
1091
1092 void scrollfront(struct vc_data *vc, int lines)
1093 {
1094 if (!lines)
1095 lines = vc->vc_rows / 2;
1096 scrolldelta(lines);
1097 }
1098
1099 static void lf(struct vc_data *vc)
1100 {
1101 /* don't scroll if above bottom of scrolling region, or
1102 * if below scrolling region
1103 */
1104 if (vc->vc_y + 1 == vc->vc_bottom)
1105 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1106 else if (vc->vc_y < vc->vc_rows - 1) {
1107 vc->vc_y++;
1108 vc->vc_pos += vc->vc_size_row;
1109 }
1110 vc->vc_need_wrap = 0;
1111 notify_write(vc, '\n');
1112 }
1113
1114 static void ri(struct vc_data *vc)
1115 {
1116 /* don't scroll if below top of scrolling region, or
1117 * if above scrolling region
1118 */
1119 if (vc->vc_y == vc->vc_top)
1120 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1121 else if (vc->vc_y > 0) {
1122 vc->vc_y--;
1123 vc->vc_pos -= vc->vc_size_row;
1124 }
1125 vc->vc_need_wrap = 0;
1126 }
1127
1128 static inline void cr(struct vc_data *vc)
1129 {
1130 vc->vc_pos -= vc->vc_x << 1;
1131 vc->vc_need_wrap = vc->vc_x = 0;
1132 notify_write(vc, '\r');
1133 }
1134
1135 static inline void bs(struct vc_data *vc)
1136 {
1137 if (vc->vc_x) {
1138 vc->vc_pos -= 2;
1139 vc->vc_x--;
1140 vc->vc_need_wrap = 0;
1141 notify_write(vc, '\b');
1142 }
1143 }
1144
1145 static inline void del(struct vc_data *vc)
1146 {
1147 /* ignored */
1148 }
1149
1150 static void csi_J(struct vc_data *vc, int vpar)
1151 {
1152 unsigned int count;
1153 unsigned short * start;
1154
1155 switch (vpar) {
1156 case 0: /* erase from cursor to end of display */
1157 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1158 start = (unsigned short *)vc->vc_pos;
1159 if (DO_UPDATE(vc)) {
1160 /* do in two stages */
1161 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1162 vc->vc_cols - vc->vc_x);
1163 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1164 vc->vc_rows - vc->vc_y - 1,
1165 vc->vc_cols);
1166 }
1167 break;
1168 case 1: /* erase from start to cursor */
1169 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1170 start = (unsigned short *)vc->vc_origin;
1171 if (DO_UPDATE(vc)) {
1172 /* do in two stages */
1173 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1174 vc->vc_cols);
1175 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1176 vc->vc_x + 1);
1177 }
1178 break;
1179 case 2: /* erase whole display */
1180 count = vc->vc_cols * vc->vc_rows;
1181 start = (unsigned short *)vc->vc_origin;
1182 if (DO_UPDATE(vc))
1183 vc->vc_sw->con_clear(vc, 0, 0,
1184 vc->vc_rows,
1185 vc->vc_cols);
1186 break;
1187 default:
1188 return;
1189 }
1190 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1191 vc->vc_need_wrap = 0;
1192 }
1193
1194 static void csi_K(struct vc_data *vc, int vpar)
1195 {
1196 unsigned int count;
1197 unsigned short * start;
1198
1199 switch (vpar) {
1200 case 0: /* erase from cursor to end of line */
1201 count = vc->vc_cols - vc->vc_x;
1202 start = (unsigned short *)vc->vc_pos;
1203 if (DO_UPDATE(vc))
1204 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1205 vc->vc_cols - vc->vc_x);
1206 break;
1207 case 1: /* erase from start of line to cursor */
1208 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209 count = vc->vc_x + 1;
1210 if (DO_UPDATE(vc))
1211 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1212 vc->vc_x + 1);
1213 break;
1214 case 2: /* erase whole line */
1215 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216 count = vc->vc_cols;
1217 if (DO_UPDATE(vc))
1218 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1219 vc->vc_cols);
1220 break;
1221 default:
1222 return;
1223 }
1224 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1225 vc->vc_need_wrap = 0;
1226 }
1227
1228 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1229 { /* not vt100? */
1230 int count;
1231
1232 if (!vpar)
1233 vpar++;
1234 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1235
1236 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1237 if (DO_UPDATE(vc))
1238 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1239 vc->vc_need_wrap = 0;
1240 }
1241
1242 static void default_attr(struct vc_data *vc)
1243 {
1244 vc->vc_intensity = 1;
1245 vc->vc_italic = 0;
1246 vc->vc_underline = 0;
1247 vc->vc_reverse = 0;
1248 vc->vc_blink = 0;
1249 vc->vc_color = vc->vc_def_color;
1250 }
1251
1252 /* console_sem is held */
1253 static void csi_m(struct vc_data *vc)
1254 {
1255 int i;
1256
1257 for (i = 0; i <= vc->vc_npar; i++)
1258 switch (vc->vc_par[i]) {
1259 case 0: /* all attributes off */
1260 default_attr(vc);
1261 break;
1262 case 1:
1263 vc->vc_intensity = 2;
1264 break;
1265 case 2:
1266 vc->vc_intensity = 0;
1267 break;
1268 case 3:
1269 vc->vc_italic = 1;
1270 break;
1271 case 4:
1272 vc->vc_underline = 1;
1273 break;
1274 case 5:
1275 vc->vc_blink = 1;
1276 break;
1277 case 7:
1278 vc->vc_reverse = 1;
1279 break;
1280 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1281 * Select primary font, don't display
1282 * control chars if defined, don't set
1283 * bit 8 on output.
1284 */
1285 vc->vc_translate = set_translate(vc->vc_charset == 0
1286 ? vc->vc_G0_charset
1287 : vc->vc_G1_charset, vc);
1288 vc->vc_disp_ctrl = 0;
1289 vc->vc_toggle_meta = 0;
1290 break;
1291 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1292 * Select first alternate font, lets
1293 * chars < 32 be displayed as ROM chars.
1294 */
1295 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1296 vc->vc_disp_ctrl = 1;
1297 vc->vc_toggle_meta = 0;
1298 break;
1299 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1300 * Select second alternate font, toggle
1301 * high bit before displaying as ROM char.
1302 */
1303 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1304 vc->vc_disp_ctrl = 1;
1305 vc->vc_toggle_meta = 1;
1306 break;
1307 case 21:
1308 case 22:
1309 vc->vc_intensity = 1;
1310 break;
1311 case 23:
1312 vc->vc_italic = 0;
1313 break;
1314 case 24:
1315 vc->vc_underline = 0;
1316 break;
1317 case 25:
1318 vc->vc_blink = 0;
1319 break;
1320 case 27:
1321 vc->vc_reverse = 0;
1322 break;
1323 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Enables underscore, white foreground
1325 * with white underscore (Linux - use
1326 * default foreground).
1327 */
1328 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1329 vc->vc_underline = 1;
1330 break;
1331 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1332 * Disable underline option.
1333 * Reset colour to default? It did this
1334 * before...
1335 */
1336 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1337 vc->vc_underline = 0;
1338 break;
1339 case 49:
1340 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1341 break;
1342 default:
1343 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1344 vc->vc_color = color_table[vc->vc_par[i] - 30]
1345 | (vc->vc_color & 0xf0);
1346 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1347 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1348 | (vc->vc_color & 0x0f);
1349 break;
1350 }
1351 update_attr(vc);
1352 }
1353
1354 static void respond_string(const char *p, struct tty_struct *tty)
1355 {
1356 while (*p) {
1357 tty_insert_flip_char(tty, *p, 0);
1358 p++;
1359 }
1360 con_schedule_flip(tty);
1361 }
1362
1363 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1364 {
1365 char buf[40];
1366
1367 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1368 respond_string(buf, tty);
1369 }
1370
1371 static inline void status_report(struct tty_struct *tty)
1372 {
1373 respond_string("\033[0n", tty); /* Terminal ok */
1374 }
1375
1376 static inline void respond_ID(struct tty_struct * tty)
1377 {
1378 respond_string(VT102ID, tty);
1379 }
1380
1381 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1382 {
1383 char buf[8];
1384
1385 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1386 (char)('!' + mry));
1387 respond_string(buf, tty);
1388 }
1389
1390 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1391 int mouse_reporting(void)
1392 {
1393 return vc_cons[fg_console].d->vc_report_mouse;
1394 }
1395
1396 /* console_sem is held */
1397 static void set_mode(struct vc_data *vc, int on_off)
1398 {
1399 int i;
1400
1401 for (i = 0; i <= vc->vc_npar; i++)
1402 if (vc->vc_ques) {
1403 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1404 case 1: /* Cursor keys send ^[Ox/^[[x */
1405 if (on_off)
1406 set_kbd(vc, decckm);
1407 else
1408 clr_kbd(vc, decckm);
1409 break;
1410 case 3: /* 80/132 mode switch unimplemented */
1411 vc->vc_deccolm = on_off;
1412 #if 0
1413 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1414 /* this alone does not suffice; some user mode
1415 utility has to change the hardware regs */
1416 #endif
1417 break;
1418 case 5: /* Inverted screen on/off */
1419 if (vc->vc_decscnm != on_off) {
1420 vc->vc_decscnm = on_off;
1421 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1422 update_attr(vc);
1423 }
1424 break;
1425 case 6: /* Origin relative/absolute */
1426 vc->vc_decom = on_off;
1427 gotoxay(vc, 0, 0);
1428 break;
1429 case 7: /* Autowrap on/off */
1430 vc->vc_decawm = on_off;
1431 break;
1432 case 8: /* Autorepeat on/off */
1433 if (on_off)
1434 set_kbd(vc, decarm);
1435 else
1436 clr_kbd(vc, decarm);
1437 break;
1438 case 9:
1439 vc->vc_report_mouse = on_off ? 1 : 0;
1440 break;
1441 case 25: /* Cursor on/off */
1442 vc->vc_deccm = on_off;
1443 break;
1444 case 1000:
1445 vc->vc_report_mouse = on_off ? 2 : 0;
1446 break;
1447 }
1448 } else {
1449 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1450 case 3: /* Monitor (display ctrls) */
1451 vc->vc_disp_ctrl = on_off;
1452 break;
1453 case 4: /* Insert Mode on/off */
1454 vc->vc_decim = on_off;
1455 break;
1456 case 20: /* Lf, Enter == CrLf/Lf */
1457 if (on_off)
1458 set_kbd(vc, lnm);
1459 else
1460 clr_kbd(vc, lnm);
1461 break;
1462 }
1463 }
1464 }
1465
1466 /* console_sem is held */
1467 static void setterm_command(struct vc_data *vc)
1468 {
1469 switch(vc->vc_par[0]) {
1470 case 1: /* set color for underline mode */
1471 if (vc->vc_can_do_color &&
1472 vc->vc_par[1] < 16) {
1473 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1474 if (vc->vc_underline)
1475 update_attr(vc);
1476 }
1477 break;
1478 case 2: /* set color for half intensity mode */
1479 if (vc->vc_can_do_color &&
1480 vc->vc_par[1] < 16) {
1481 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1482 if (vc->vc_intensity == 0)
1483 update_attr(vc);
1484 }
1485 break;
1486 case 8: /* store colors as defaults */
1487 vc->vc_def_color = vc->vc_attr;
1488 if (vc->vc_hi_font_mask == 0x100)
1489 vc->vc_def_color >>= 1;
1490 default_attr(vc);
1491 update_attr(vc);
1492 break;
1493 case 9: /* set blanking interval */
1494 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1495 poke_blanked_console();
1496 break;
1497 case 10: /* set bell frequency in Hz */
1498 if (vc->vc_npar >= 1)
1499 vc->vc_bell_pitch = vc->vc_par[1];
1500 else
1501 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1502 break;
1503 case 11: /* set bell duration in msec */
1504 if (vc->vc_npar >= 1)
1505 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1506 vc->vc_par[1] * HZ / 1000 : 0;
1507 else
1508 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1509 break;
1510 case 12: /* bring specified console to the front */
1511 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1512 set_console(vc->vc_par[1] - 1);
1513 break;
1514 case 13: /* unblank the screen */
1515 poke_blanked_console();
1516 break;
1517 case 14: /* set vesa powerdown interval */
1518 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1519 break;
1520 case 15: /* activate the previous console */
1521 set_console(last_console);
1522 break;
1523 }
1524 }
1525
1526 /* console_sem is held */
1527 static void csi_at(struct vc_data *vc, unsigned int nr)
1528 {
1529 if (nr > vc->vc_cols - vc->vc_x)
1530 nr = vc->vc_cols - vc->vc_x;
1531 else if (!nr)
1532 nr = 1;
1533 insert_char(vc, nr);
1534 }
1535
1536 /* console_sem is held */
1537 static void csi_L(struct vc_data *vc, unsigned int nr)
1538 {
1539 if (nr > vc->vc_rows - vc->vc_y)
1540 nr = vc->vc_rows - vc->vc_y;
1541 else if (!nr)
1542 nr = 1;
1543 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1544 vc->vc_need_wrap = 0;
1545 }
1546
1547 /* console_sem is held */
1548 static void csi_P(struct vc_data *vc, unsigned int nr)
1549 {
1550 if (nr > vc->vc_cols - vc->vc_x)
1551 nr = vc->vc_cols - vc->vc_x;
1552 else if (!nr)
1553 nr = 1;
1554 delete_char(vc, nr);
1555 }
1556
1557 /* console_sem is held */
1558 static void csi_M(struct vc_data *vc, unsigned int nr)
1559 {
1560 if (nr > vc->vc_rows - vc->vc_y)
1561 nr = vc->vc_rows - vc->vc_y;
1562 else if (!nr)
1563 nr=1;
1564 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1565 vc->vc_need_wrap = 0;
1566 }
1567
1568 /* console_sem is held (except via vc_init->reset_terminal */
1569 static void save_cur(struct vc_data *vc)
1570 {
1571 vc->vc_saved_x = vc->vc_x;
1572 vc->vc_saved_y = vc->vc_y;
1573 vc->vc_s_intensity = vc->vc_intensity;
1574 vc->vc_s_italic = vc->vc_italic;
1575 vc->vc_s_underline = vc->vc_underline;
1576 vc->vc_s_blink = vc->vc_blink;
1577 vc->vc_s_reverse = vc->vc_reverse;
1578 vc->vc_s_charset = vc->vc_charset;
1579 vc->vc_s_color = vc->vc_color;
1580 vc->vc_saved_G0 = vc->vc_G0_charset;
1581 vc->vc_saved_G1 = vc->vc_G1_charset;
1582 }
1583
1584 /* console_sem is held */
1585 static void restore_cur(struct vc_data *vc)
1586 {
1587 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1588 vc->vc_intensity = vc->vc_s_intensity;
1589 vc->vc_italic = vc->vc_s_italic;
1590 vc->vc_underline = vc->vc_s_underline;
1591 vc->vc_blink = vc->vc_s_blink;
1592 vc->vc_reverse = vc->vc_s_reverse;
1593 vc->vc_charset = vc->vc_s_charset;
1594 vc->vc_color = vc->vc_s_color;
1595 vc->vc_G0_charset = vc->vc_saved_G0;
1596 vc->vc_G1_charset = vc->vc_saved_G1;
1597 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1598 update_attr(vc);
1599 vc->vc_need_wrap = 0;
1600 }
1601
1602 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1603 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1604 ESpalette };
1605
1606 /* console_sem is held (except via vc_init()) */
1607 static void reset_terminal(struct vc_data *vc, int do_clear)
1608 {
1609 vc->vc_top = 0;
1610 vc->vc_bottom = vc->vc_rows;
1611 vc->vc_state = ESnormal;
1612 vc->vc_ques = 0;
1613 vc->vc_translate = set_translate(LAT1_MAP, vc);
1614 vc->vc_G0_charset = LAT1_MAP;
1615 vc->vc_G1_charset = GRAF_MAP;
1616 vc->vc_charset = 0;
1617 vc->vc_need_wrap = 0;
1618 vc->vc_report_mouse = 0;
1619 vc->vc_utf = default_utf8;
1620 vc->vc_utf_count = 0;
1621
1622 vc->vc_disp_ctrl = 0;
1623 vc->vc_toggle_meta = 0;
1624
1625 vc->vc_decscnm = 0;
1626 vc->vc_decom = 0;
1627 vc->vc_decawm = 1;
1628 vc->vc_deccm = global_cursor_default;
1629 vc->vc_decim = 0;
1630
1631 set_kbd(vc, decarm);
1632 clr_kbd(vc, decckm);
1633 clr_kbd(vc, kbdapplic);
1634 clr_kbd(vc, lnm);
1635 kbd_table[vc->vc_num].lockstate = 0;
1636 kbd_table[vc->vc_num].slockstate = 0;
1637 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1638 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1639 /* do not do set_leds here because this causes an endless tasklet loop
1640 when the keyboard hasn't been initialized yet */
1641
1642 vc->vc_cursor_type = cur_default;
1643 vc->vc_complement_mask = vc->vc_s_complement_mask;
1644
1645 default_attr(vc);
1646 update_attr(vc);
1647
1648 vc->vc_tab_stop[0] = 0x01010100;
1649 vc->vc_tab_stop[1] =
1650 vc->vc_tab_stop[2] =
1651 vc->vc_tab_stop[3] =
1652 vc->vc_tab_stop[4] =
1653 vc->vc_tab_stop[5] =
1654 vc->vc_tab_stop[6] =
1655 vc->vc_tab_stop[7] = 0x01010101;
1656
1657 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1658 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1659
1660 gotoxy(vc, 0, 0);
1661 save_cur(vc);
1662 if (do_clear)
1663 csi_J(vc, 2);
1664 }
1665
1666 /* console_sem is held */
1667 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1668 {
1669 /*
1670 * Control characters can be used in the _middle_
1671 * of an escape sequence.
1672 */
1673 switch (c) {
1674 case 0:
1675 return;
1676 case 7:
1677 if (vc->vc_bell_duration)
1678 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1679 return;
1680 case 8:
1681 bs(vc);
1682 return;
1683 case 9:
1684 vc->vc_pos -= (vc->vc_x << 1);
1685 while (vc->vc_x < vc->vc_cols - 1) {
1686 vc->vc_x++;
1687 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1688 break;
1689 }
1690 vc->vc_pos += (vc->vc_x << 1);
1691 notify_write(vc, '\t');
1692 return;
1693 case 10: case 11: case 12:
1694 lf(vc);
1695 if (!is_kbd(vc, lnm))
1696 return;
1697 case 13:
1698 cr(vc);
1699 return;
1700 case 14:
1701 vc->vc_charset = 1;
1702 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1703 vc->vc_disp_ctrl = 1;
1704 return;
1705 case 15:
1706 vc->vc_charset = 0;
1707 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1708 vc->vc_disp_ctrl = 0;
1709 return;
1710 case 24: case 26:
1711 vc->vc_state = ESnormal;
1712 return;
1713 case 27:
1714 vc->vc_state = ESesc;
1715 return;
1716 case 127:
1717 del(vc);
1718 return;
1719 case 128+27:
1720 vc->vc_state = ESsquare;
1721 return;
1722 }
1723 switch(vc->vc_state) {
1724 case ESesc:
1725 vc->vc_state = ESnormal;
1726 switch (c) {
1727 case '[':
1728 vc->vc_state = ESsquare;
1729 return;
1730 case ']':
1731 vc->vc_state = ESnonstd;
1732 return;
1733 case '%':
1734 vc->vc_state = ESpercent;
1735 return;
1736 case 'E':
1737 cr(vc);
1738 lf(vc);
1739 return;
1740 case 'M':
1741 ri(vc);
1742 return;
1743 case 'D':
1744 lf(vc);
1745 return;
1746 case 'H':
1747 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1748 return;
1749 case 'Z':
1750 respond_ID(tty);
1751 return;
1752 case '7':
1753 save_cur(vc);
1754 return;
1755 case '8':
1756 restore_cur(vc);
1757 return;
1758 case '(':
1759 vc->vc_state = ESsetG0;
1760 return;
1761 case ')':
1762 vc->vc_state = ESsetG1;
1763 return;
1764 case '#':
1765 vc->vc_state = EShash;
1766 return;
1767 case 'c':
1768 reset_terminal(vc, 1);
1769 return;
1770 case '>': /* Numeric keypad */
1771 clr_kbd(vc, kbdapplic);
1772 return;
1773 case '=': /* Appl. keypad */
1774 set_kbd(vc, kbdapplic);
1775 return;
1776 }
1777 return;
1778 case ESnonstd:
1779 if (c=='P') { /* palette escape sequence */
1780 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1781 vc->vc_par[vc->vc_npar] = 0;
1782 vc->vc_npar = 0;
1783 vc->vc_state = ESpalette;
1784 return;
1785 } else if (c=='R') { /* reset palette */
1786 reset_palette(vc);
1787 vc->vc_state = ESnormal;
1788 } else
1789 vc->vc_state = ESnormal;
1790 return;
1791 case ESpalette:
1792 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1793 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1794 if (vc->vc_npar == 7) {
1795 int i = vc->vc_par[0] * 3, j = 1;
1796 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1797 vc->vc_palette[i++] += vc->vc_par[j++];
1798 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1799 vc->vc_palette[i++] += vc->vc_par[j++];
1800 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1801 vc->vc_palette[i] += vc->vc_par[j];
1802 set_palette(vc);
1803 vc->vc_state = ESnormal;
1804 }
1805 } else
1806 vc->vc_state = ESnormal;
1807 return;
1808 case ESsquare:
1809 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1810 vc->vc_par[vc->vc_npar] = 0;
1811 vc->vc_npar = 0;
1812 vc->vc_state = ESgetpars;
1813 if (c == '[') { /* Function key */
1814 vc->vc_state=ESfunckey;
1815 return;
1816 }
1817 vc->vc_ques = (c == '?');
1818 if (vc->vc_ques)
1819 return;
1820 case ESgetpars:
1821 if (c == ';' && vc->vc_npar < NPAR - 1) {
1822 vc->vc_npar++;
1823 return;
1824 } else if (c>='0' && c<='9') {
1825 vc->vc_par[vc->vc_npar] *= 10;
1826 vc->vc_par[vc->vc_npar] += c - '0';
1827 return;
1828 } else
1829 vc->vc_state = ESgotpars;
1830 case ESgotpars:
1831 vc->vc_state = ESnormal;
1832 switch(c) {
1833 case 'h':
1834 set_mode(vc, 1);
1835 return;
1836 case 'l':
1837 set_mode(vc, 0);
1838 return;
1839 case 'c':
1840 if (vc->vc_ques) {
1841 if (vc->vc_par[0])
1842 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1843 else
1844 vc->vc_cursor_type = cur_default;
1845 return;
1846 }
1847 break;
1848 case 'm':
1849 if (vc->vc_ques) {
1850 clear_selection();
1851 if (vc->vc_par[0])
1852 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1853 else
1854 vc->vc_complement_mask = vc->vc_s_complement_mask;
1855 return;
1856 }
1857 break;
1858 case 'n':
1859 if (!vc->vc_ques) {
1860 if (vc->vc_par[0] == 5)
1861 status_report(tty);
1862 else if (vc->vc_par[0] == 6)
1863 cursor_report(vc, tty);
1864 }
1865 return;
1866 }
1867 if (vc->vc_ques) {
1868 vc->vc_ques = 0;
1869 return;
1870 }
1871 switch(c) {
1872 case 'G': case '`':
1873 if (vc->vc_par[0])
1874 vc->vc_par[0]--;
1875 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1876 return;
1877 case 'A':
1878 if (!vc->vc_par[0])
1879 vc->vc_par[0]++;
1880 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1881 return;
1882 case 'B': case 'e':
1883 if (!vc->vc_par[0])
1884 vc->vc_par[0]++;
1885 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1886 return;
1887 case 'C': case 'a':
1888 if (!vc->vc_par[0])
1889 vc->vc_par[0]++;
1890 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1891 return;
1892 case 'D':
1893 if (!vc->vc_par[0])
1894 vc->vc_par[0]++;
1895 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1896 return;
1897 case 'E':
1898 if (!vc->vc_par[0])
1899 vc->vc_par[0]++;
1900 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1901 return;
1902 case 'F':
1903 if (!vc->vc_par[0])
1904 vc->vc_par[0]++;
1905 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1906 return;
1907 case 'd':
1908 if (vc->vc_par[0])
1909 vc->vc_par[0]--;
1910 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1911 return;
1912 case 'H': case 'f':
1913 if (vc->vc_par[0])
1914 vc->vc_par[0]--;
1915 if (vc->vc_par[1])
1916 vc->vc_par[1]--;
1917 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1918 return;
1919 case 'J':
1920 csi_J(vc, vc->vc_par[0]);
1921 return;
1922 case 'K':
1923 csi_K(vc, vc->vc_par[0]);
1924 return;
1925 case 'L':
1926 csi_L(vc, vc->vc_par[0]);
1927 return;
1928 case 'M':
1929 csi_M(vc, vc->vc_par[0]);
1930 return;
1931 case 'P':
1932 csi_P(vc, vc->vc_par[0]);
1933 return;
1934 case 'c':
1935 if (!vc->vc_par[0])
1936 respond_ID(tty);
1937 return;
1938 case 'g':
1939 if (!vc->vc_par[0])
1940 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1941 else if (vc->vc_par[0] == 3) {
1942 vc->vc_tab_stop[0] =
1943 vc->vc_tab_stop[1] =
1944 vc->vc_tab_stop[2] =
1945 vc->vc_tab_stop[3] =
1946 vc->vc_tab_stop[4] =
1947 vc->vc_tab_stop[5] =
1948 vc->vc_tab_stop[6] =
1949 vc->vc_tab_stop[7] = 0;
1950 }
1951 return;
1952 case 'm':
1953 csi_m(vc);
1954 return;
1955 case 'q': /* DECLL - but only 3 leds */
1956 /* map 0,1,2,3 to 0,1,2,4 */
1957 if (vc->vc_par[0] < 4)
1958 setledstate(kbd_table + vc->vc_num,
1959 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1960 return;
1961 case 'r':
1962 if (!vc->vc_par[0])
1963 vc->vc_par[0]++;
1964 if (!vc->vc_par[1])
1965 vc->vc_par[1] = vc->vc_rows;
1966 /* Minimum allowed region is 2 lines */
1967 if (vc->vc_par[0] < vc->vc_par[1] &&
1968 vc->vc_par[1] <= vc->vc_rows) {
1969 vc->vc_top = vc->vc_par[0] - 1;
1970 vc->vc_bottom = vc->vc_par[1];
1971 gotoxay(vc, 0, 0);
1972 }
1973 return;
1974 case 's':
1975 save_cur(vc);
1976 return;
1977 case 'u':
1978 restore_cur(vc);
1979 return;
1980 case 'X':
1981 csi_X(vc, vc->vc_par[0]);
1982 return;
1983 case '@':
1984 csi_at(vc, vc->vc_par[0]);
1985 return;
1986 case ']': /* setterm functions */
1987 setterm_command(vc);
1988 return;
1989 }
1990 return;
1991 case ESpercent:
1992 vc->vc_state = ESnormal;
1993 switch (c) {
1994 case '@': /* defined in ISO 2022 */
1995 vc->vc_utf = 0;
1996 return;
1997 case 'G': /* prelim official escape code */
1998 case '8': /* retained for compatibility */
1999 vc->vc_utf = 1;
2000 return;
2001 }
2002 return;
2003 case ESfunckey:
2004 vc->vc_state = ESnormal;
2005 return;
2006 case EShash:
2007 vc->vc_state = ESnormal;
2008 if (c == '8') {
2009 /* DEC screen alignment test. kludge :-) */
2010 vc->vc_video_erase_char =
2011 (vc->vc_video_erase_char & 0xff00) | 'E';
2012 csi_J(vc, 2);
2013 vc->vc_video_erase_char =
2014 (vc->vc_video_erase_char & 0xff00) | ' ';
2015 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2016 }
2017 return;
2018 case ESsetG0:
2019 if (c == '0')
2020 vc->vc_G0_charset = GRAF_MAP;
2021 else if (c == 'B')
2022 vc->vc_G0_charset = LAT1_MAP;
2023 else if (c == 'U')
2024 vc->vc_G0_charset = IBMPC_MAP;
2025 else if (c == 'K')
2026 vc->vc_G0_charset = USER_MAP;
2027 if (vc->vc_charset == 0)
2028 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2029 vc->vc_state = ESnormal;
2030 return;
2031 case ESsetG1:
2032 if (c == '0')
2033 vc->vc_G1_charset = GRAF_MAP;
2034 else if (c == 'B')
2035 vc->vc_G1_charset = LAT1_MAP;
2036 else if (c == 'U')
2037 vc->vc_G1_charset = IBMPC_MAP;
2038 else if (c == 'K')
2039 vc->vc_G1_charset = USER_MAP;
2040 if (vc->vc_charset == 1)
2041 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2042 vc->vc_state = ESnormal;
2043 return;
2044 default:
2045 vc->vc_state = ESnormal;
2046 }
2047 }
2048
2049 /* This is a temporary buffer used to prepare a tty console write
2050 * so that we can easily avoid touching user space while holding the
2051 * console spinlock. It is allocated in con_init and is shared by
2052 * this code and the vc_screen read/write tty calls.
2053 *
2054 * We have to allocate this statically in the kernel data section
2055 * since console_init (and thus con_init) are called before any
2056 * kernel memory allocation is available.
2057 */
2058 char con_buf[CON_BUF_SIZE];
2059 DEFINE_MUTEX(con_buf_mtx);
2060
2061 /* is_double_width() is based on the wcwidth() implementation by
2062 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2063 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2064 */
2065 struct interval {
2066 uint32_t first;
2067 uint32_t last;
2068 };
2069
2070 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2071 {
2072 int min = 0;
2073 int mid;
2074
2075 if (ucs < table[0].first || ucs > table[max].last)
2076 return 0;
2077 while (max >= min) {
2078 mid = (min + max) / 2;
2079 if (ucs > table[mid].last)
2080 min = mid + 1;
2081 else if (ucs < table[mid].first)
2082 max = mid - 1;
2083 else
2084 return 1;
2085 }
2086 return 0;
2087 }
2088
2089 static int is_double_width(uint32_t ucs)
2090 {
2091 static const struct interval double_width[] = {
2092 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2093 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2094 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2095 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2096 };
2097 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2098 }
2099
2100 /* acquires console_sem */
2101 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2102 {
2103 #ifdef VT_BUF_VRAM_ONLY
2104 #define FLUSH do { } while(0);
2105 #else
2106 #define FLUSH if (draw_x >= 0) { \
2107 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2108 draw_x = -1; \
2109 }
2110 #endif
2111
2112 int c, tc, ok, n = 0, draw_x = -1;
2113 unsigned int currcons;
2114 unsigned long draw_from = 0, draw_to = 0;
2115 struct vc_data *vc;
2116 unsigned char vc_attr;
2117 struct vt_notifier_param param;
2118 uint8_t rescan;
2119 uint8_t inverse;
2120 uint8_t width;
2121 u16 himask, charmask;
2122
2123 if (in_interrupt())
2124 return count;
2125
2126 might_sleep();
2127
2128 acquire_console_sem();
2129 vc = tty->driver_data;
2130 if (vc == NULL) {
2131 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2132 release_console_sem();
2133 return 0;
2134 }
2135
2136 currcons = vc->vc_num;
2137 if (!vc_cons_allocated(currcons)) {
2138 /* could this happen? */
2139 printk_once("con_write: tty %d not allocated\n", currcons+1);
2140 release_console_sem();
2141 return 0;
2142 }
2143
2144 himask = vc->vc_hi_font_mask;
2145 charmask = himask ? 0x1ff : 0xff;
2146
2147 /* undraw cursor first */
2148 if (IS_FG(vc))
2149 hide_cursor(vc);
2150
2151 param.vc = vc;
2152
2153 while (!tty->stopped && count) {
2154 int orig = *buf;
2155 c = orig;
2156 buf++;
2157 n++;
2158 count--;
2159 rescan = 0;
2160 inverse = 0;
2161 width = 1;
2162
2163 /* Do no translation at all in control states */
2164 if (vc->vc_state != ESnormal) {
2165 tc = c;
2166 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2167 /* Combine UTF-8 into Unicode in vc_utf_char.
2168 * vc_utf_count is the number of continuation bytes still
2169 * expected to arrive.
2170 * vc_npar is the number of continuation bytes arrived so
2171 * far
2172 */
2173 rescan_last_byte:
2174 if ((c & 0xc0) == 0x80) {
2175 /* Continuation byte received */
2176 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2177 if (vc->vc_utf_count) {
2178 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2179 vc->vc_npar++;
2180 if (--vc->vc_utf_count) {
2181 /* Still need some bytes */
2182 continue;
2183 }
2184 /* Got a whole character */
2185 c = vc->vc_utf_char;
2186 /* Reject overlong sequences */
2187 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2188 c > utf8_length_changes[vc->vc_npar])
2189 c = 0xfffd;
2190 } else {
2191 /* Unexpected continuation byte */
2192 vc->vc_utf_count = 0;
2193 c = 0xfffd;
2194 }
2195 } else {
2196 /* Single ASCII byte or first byte of a sequence received */
2197 if (vc->vc_utf_count) {
2198 /* Continuation byte expected */
2199 rescan = 1;
2200 vc->vc_utf_count = 0;
2201 c = 0xfffd;
2202 } else if (c > 0x7f) {
2203 /* First byte of a multibyte sequence received */
2204 vc->vc_npar = 0;
2205 if ((c & 0xe0) == 0xc0) {
2206 vc->vc_utf_count = 1;
2207 vc->vc_utf_char = (c & 0x1f);
2208 } else if ((c & 0xf0) == 0xe0) {
2209 vc->vc_utf_count = 2;
2210 vc->vc_utf_char = (c & 0x0f);
2211 } else if ((c & 0xf8) == 0xf0) {
2212 vc->vc_utf_count = 3;
2213 vc->vc_utf_char = (c & 0x07);
2214 } else if ((c & 0xfc) == 0xf8) {
2215 vc->vc_utf_count = 4;
2216 vc->vc_utf_char = (c & 0x03);
2217 } else if ((c & 0xfe) == 0xfc) {
2218 vc->vc_utf_count = 5;
2219 vc->vc_utf_char = (c & 0x01);
2220 } else {
2221 /* 254 and 255 are invalid */
2222 c = 0xfffd;
2223 }
2224 if (vc->vc_utf_count) {
2225 /* Still need some bytes */
2226 continue;
2227 }
2228 }
2229 /* Nothing to do if an ASCII byte was received */
2230 }
2231 /* End of UTF-8 decoding. */
2232 /* c is the received character, or U+FFFD for invalid sequences. */
2233 /* Replace invalid Unicode code points with U+FFFD too */
2234 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2235 c = 0xfffd;
2236 tc = c;
2237 } else { /* no utf or alternate charset mode */
2238 tc = vc_translate(vc, c);
2239 }
2240
2241 param.c = tc;
2242 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2243 &param) == NOTIFY_STOP)
2244 continue;
2245
2246 /* If the original code was a control character we
2247 * only allow a glyph to be displayed if the code is
2248 * not normally used (such as for cursor movement) or
2249 * if the disp_ctrl mode has been explicitly enabled.
2250 * Certain characters (as given by the CTRL_ALWAYS
2251 * bitmap) are always displayed as control characters,
2252 * as the console would be pretty useless without
2253 * them; to display an arbitrary font position use the
2254 * direct-to-font zone in UTF-8 mode.
2255 */
2256 ok = tc && (c >= 32 ||
2257 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2258 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2259 && (c != 127 || vc->vc_disp_ctrl)
2260 && (c != 128+27);
2261
2262 if (vc->vc_state == ESnormal && ok) {
2263 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2264 if (is_double_width(c))
2265 width = 2;
2266 }
2267 /* Now try to find out how to display it */
2268 tc = conv_uni_to_pc(vc, tc);
2269 if (tc & ~charmask) {
2270 if (tc == -1 || tc == -2) {
2271 continue; /* nothing to display */
2272 }
2273 /* Glyph not found */
2274 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2275 /* In legacy mode use the glyph we get by a 1:1 mapping.
2276 This would make absolutely no sense with Unicode in mind,
2277 but do this for ASCII characters since a font may lack
2278 Unicode mapping info and we don't want to end up with
2279 having question marks only. */
2280 tc = c;
2281 } else {
2282 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2283 tc = conv_uni_to_pc(vc, 0xfffd);
2284 if (tc < 0) {
2285 inverse = 1;
2286 tc = conv_uni_to_pc(vc, '?');
2287 if (tc < 0) tc = '?';
2288 }
2289 }
2290 }
2291
2292 if (!inverse) {
2293 vc_attr = vc->vc_attr;
2294 } else {
2295 /* invert vc_attr */
2296 if (!vc->vc_can_do_color) {
2297 vc_attr = (vc->vc_attr) ^ 0x08;
2298 } else if (vc->vc_hi_font_mask == 0x100) {
2299 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2300 } else {
2301 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2302 }
2303 FLUSH
2304 }
2305
2306 while (1) {
2307 if (vc->vc_need_wrap || vc->vc_decim)
2308 FLUSH
2309 if (vc->vc_need_wrap) {
2310 cr(vc);
2311 lf(vc);
2312 }
2313 if (vc->vc_decim)
2314 insert_char(vc, 1);
2315 scr_writew(himask ?
2316 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2317 (vc_attr << 8) + tc,
2318 (u16 *) vc->vc_pos);
2319 if (DO_UPDATE(vc) && draw_x < 0) {
2320 draw_x = vc->vc_x;
2321 draw_from = vc->vc_pos;
2322 }
2323 if (vc->vc_x == vc->vc_cols - 1) {
2324 vc->vc_need_wrap = vc->vc_decawm;
2325 draw_to = vc->vc_pos + 2;
2326 } else {
2327 vc->vc_x++;
2328 draw_to = (vc->vc_pos += 2);
2329 }
2330
2331 if (!--width) break;
2332
2333 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2334 if (tc < 0) tc = ' ';
2335 }
2336 notify_write(vc, c);
2337
2338 if (inverse) {
2339 FLUSH
2340 }
2341
2342 if (rescan) {
2343 rescan = 0;
2344 inverse = 0;
2345 width = 1;
2346 c = orig;
2347 goto rescan_last_byte;
2348 }
2349 continue;
2350 }
2351 FLUSH
2352 do_con_trol(tty, vc, orig);
2353 }
2354 FLUSH
2355 console_conditional_schedule();
2356 release_console_sem();
2357 notify_update(vc);
2358 return n;
2359 #undef FLUSH
2360 }
2361
2362 /*
2363 * This is the console switching callback.
2364 *
2365 * Doing console switching in a process context allows
2366 * us to do the switches asynchronously (needed when we want
2367 * to switch due to a keyboard interrupt). Synchronization
2368 * with other console code and prevention of re-entrancy is
2369 * ensured with console_sem.
2370 */
2371 static void console_callback(struct work_struct *ignored)
2372 {
2373 acquire_console_sem();
2374
2375 if (want_console >= 0) {
2376 if (want_console != fg_console &&
2377 vc_cons_allocated(want_console)) {
2378 hide_cursor(vc_cons[fg_console].d);
2379 change_console(vc_cons[want_console].d);
2380 /* we only changed when the console had already
2381 been allocated - a new console is not created
2382 in an interrupt routine */
2383 }
2384 want_console = -1;
2385 }
2386 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2387 do_poke_blanked_console = 0;
2388 poke_blanked_console();
2389 }
2390 if (scrollback_delta) {
2391 struct vc_data *vc = vc_cons[fg_console].d;
2392 clear_selection();
2393 if (vc->vc_mode == KD_TEXT)
2394 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2395 scrollback_delta = 0;
2396 }
2397 if (blank_timer_expired) {
2398 do_blank_screen(0);
2399 blank_timer_expired = 0;
2400 }
2401 notify_update(vc_cons[fg_console].d);
2402
2403 release_console_sem();
2404 }
2405
2406 int set_console(int nr)
2407 {
2408 struct vc_data *vc = vc_cons[fg_console].d;
2409
2410 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2411 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2412
2413 /*
2414 * Console switch will fail in console_callback() or
2415 * change_console() so there is no point scheduling
2416 * the callback
2417 *
2418 * Existing set_console() users don't check the return
2419 * value so this shouldn't break anything
2420 */
2421 return -EINVAL;
2422 }
2423
2424 want_console = nr;
2425 schedule_console_callback();
2426
2427 return 0;
2428 }
2429
2430 struct tty_driver *console_driver;
2431
2432 #ifdef CONFIG_VT_CONSOLE
2433
2434 /**
2435 * vt_kmsg_redirect() - Sets/gets the kernel message console
2436 * @new: The new virtual terminal number or -1 if the console should stay
2437 * unchanged
2438 *
2439 * By default, the kernel messages are always printed on the current virtual
2440 * console. However, the user may modify that default with the
2441 * TIOCL_SETKMSGREDIRECT ioctl call.
2442 *
2443 * This function sets the kernel message console to be @new. It returns the old
2444 * virtual console number. The virtual terminal number 0 (both as parameter and
2445 * return value) means no redirection (i.e. always printed on the currently
2446 * active console).
2447 *
2448 * The parameter -1 means that only the current console is returned, but the
2449 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2450 * case to make the code more understandable.
2451 *
2452 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2453 * the parameter and always returns 0.
2454 */
2455 int vt_kmsg_redirect(int new)
2456 {
2457 static int kmsg_con;
2458
2459 if (new != -1)
2460 return xchg(&kmsg_con, new);
2461 else
2462 return kmsg_con;
2463 }
2464
2465 /*
2466 * Console on virtual terminal
2467 *
2468 * The console must be locked when we get here.
2469 */
2470
2471 static void vt_console_print(struct console *co, const char *b, unsigned count)
2472 {
2473 struct vc_data *vc = vc_cons[fg_console].d;
2474 unsigned char c;
2475 static DEFINE_SPINLOCK(printing_lock);
2476 const ushort *start;
2477 ushort cnt = 0;
2478 ushort myx;
2479 int kmsg_console;
2480
2481 /* console busy or not yet initialized */
2482 if (!printable)
2483 return;
2484 if (!spin_trylock(&printing_lock))
2485 return;
2486
2487 kmsg_console = vt_get_kmsg_redirect();
2488 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2489 vc = vc_cons[kmsg_console - 1].d;
2490
2491 /* read `x' only after setting currcons properly (otherwise
2492 the `x' macro will read the x of the foreground console). */
2493 myx = vc->vc_x;
2494
2495 if (!vc_cons_allocated(fg_console)) {
2496 /* impossible */
2497 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2498 goto quit;
2499 }
2500
2501 if (vc->vc_mode != KD_TEXT)
2502 goto quit;
2503
2504 /* undraw cursor first */
2505 if (IS_FG(vc))
2506 hide_cursor(vc);
2507
2508 start = (ushort *)vc->vc_pos;
2509
2510 /* Contrived structure to try to emulate original need_wrap behaviour
2511 * Problems caused when we have need_wrap set on '\n' character */
2512 while (count--) {
2513 c = *b++;
2514 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2515 if (cnt > 0) {
2516 if (CON_IS_VISIBLE(vc))
2517 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2518 vc->vc_x += cnt;
2519 if (vc->vc_need_wrap)
2520 vc->vc_x--;
2521 cnt = 0;
2522 }
2523 if (c == 8) { /* backspace */
2524 bs(vc);
2525 start = (ushort *)vc->vc_pos;
2526 myx = vc->vc_x;
2527 continue;
2528 }
2529 if (c != 13)
2530 lf(vc);
2531 cr(vc);
2532 start = (ushort *)vc->vc_pos;
2533 myx = vc->vc_x;
2534 if (c == 10 || c == 13)
2535 continue;
2536 }
2537 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2538 notify_write(vc, c);
2539 cnt++;
2540 if (myx == vc->vc_cols - 1) {
2541 vc->vc_need_wrap = 1;
2542 continue;
2543 }
2544 vc->vc_pos += 2;
2545 myx++;
2546 }
2547 if (cnt > 0) {
2548 if (CON_IS_VISIBLE(vc))
2549 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2550 vc->vc_x += cnt;
2551 if (vc->vc_x == vc->vc_cols) {
2552 vc->vc_x--;
2553 vc->vc_need_wrap = 1;
2554 }
2555 }
2556 set_cursor(vc);
2557 notify_update(vc);
2558
2559 quit:
2560 spin_unlock(&printing_lock);
2561 }
2562
2563 static struct tty_driver *vt_console_device(struct console *c, int *index)
2564 {
2565 *index = c->index ? c->index-1 : fg_console;
2566 return console_driver;
2567 }
2568
2569 static struct console vt_console_driver = {
2570 .name = "tty",
2571 .write = vt_console_print,
2572 .device = vt_console_device,
2573 .unblank = unblank_screen,
2574 .flags = CON_PRINTBUFFER,
2575 .index = -1,
2576 };
2577 #endif
2578
2579 /*
2580 * Handling of Linux-specific VC ioctls
2581 */
2582
2583 /*
2584 * Generally a bit racy with respect to console_sem().
2585 *
2586 * There are some functions which don't need it.
2587 *
2588 * There are some functions which can sleep for arbitrary periods
2589 * (paste_selection) but we don't need the lock there anyway.
2590 *
2591 * set_selection has locking, and definitely needs it
2592 */
2593
2594 int tioclinux(struct tty_struct *tty, unsigned long arg)
2595 {
2596 char type, data;
2597 char __user *p = (char __user *)arg;
2598 int lines;
2599 int ret;
2600
2601 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2602 return -EPERM;
2603 if (get_user(type, p))
2604 return -EFAULT;
2605 ret = 0;
2606
2607 lock_kernel();
2608
2609 switch (type)
2610 {
2611 case TIOCL_SETSEL:
2612 acquire_console_sem();
2613 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2614 release_console_sem();
2615 break;
2616 case TIOCL_PASTESEL:
2617 ret = paste_selection(tty);
2618 break;
2619 case TIOCL_UNBLANKSCREEN:
2620 acquire_console_sem();
2621 unblank_screen();
2622 release_console_sem();
2623 break;
2624 case TIOCL_SELLOADLUT:
2625 ret = sel_loadlut(p);
2626 break;
2627 case TIOCL_GETSHIFTSTATE:
2628
2629 /*
2630 * Make it possible to react to Shift+Mousebutton.
2631 * Note that 'shift_state' is an undocumented
2632 * kernel-internal variable; programs not closely
2633 * related to the kernel should not use this.
2634 */
2635 data = shift_state;
2636 ret = __put_user(data, p);
2637 break;
2638 case TIOCL_GETMOUSEREPORTING:
2639 data = mouse_reporting();
2640 ret = __put_user(data, p);
2641 break;
2642 case TIOCL_SETVESABLANK:
2643 ret = set_vesa_blanking(p);
2644 break;
2645 case TIOCL_GETKMSGREDIRECT:
2646 data = vt_get_kmsg_redirect();
2647 ret = __put_user(data, p);
2648 break;
2649 case TIOCL_SETKMSGREDIRECT:
2650 if (!capable(CAP_SYS_ADMIN)) {
2651 ret = -EPERM;
2652 } else {
2653 if (get_user(data, p+1))
2654 ret = -EFAULT;
2655 else
2656 vt_kmsg_redirect(data);
2657 }
2658 break;
2659 case TIOCL_GETFGCONSOLE:
2660 ret = fg_console;
2661 break;
2662 case TIOCL_SCROLLCONSOLE:
2663 if (get_user(lines, (s32 __user *)(p+4))) {
2664 ret = -EFAULT;
2665 } else {
2666 scrollfront(vc_cons[fg_console].d, lines);
2667 ret = 0;
2668 }
2669 break;
2670 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2671 acquire_console_sem();
2672 ignore_poke = 1;
2673 do_blank_screen(0);
2674 release_console_sem();
2675 break;
2676 case TIOCL_BLANKEDSCREEN:
2677 ret = console_blanked;
2678 break;
2679 default:
2680 ret = -EINVAL;
2681 break;
2682 }
2683 unlock_kernel();
2684 return ret;
2685 }
2686
2687 /*
2688 * /dev/ttyN handling
2689 */
2690
2691 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2692 {
2693 int retval;
2694
2695 retval = do_con_write(tty, buf, count);
2696 con_flush_chars(tty);
2697
2698 return retval;
2699 }
2700
2701 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2702 {
2703 if (in_interrupt())
2704 return 0; /* n_r3964 calls put_char() from interrupt context */
2705 return do_con_write(tty, &ch, 1);
2706 }
2707
2708 static int con_write_room(struct tty_struct *tty)
2709 {
2710 if (tty->stopped)
2711 return 0;
2712 return 32768; /* No limit, really; we're not buffering */
2713 }
2714
2715 static int con_chars_in_buffer(struct tty_struct *tty)
2716 {
2717 return 0; /* we're not buffering */
2718 }
2719
2720 /*
2721 * con_throttle and con_unthrottle are only used for
2722 * paste_selection(), which has to stuff in a large number of
2723 * characters...
2724 */
2725 static void con_throttle(struct tty_struct *tty)
2726 {
2727 }
2728
2729 static void con_unthrottle(struct tty_struct *tty)
2730 {
2731 struct vc_data *vc = tty->driver_data;
2732
2733 wake_up_interruptible(&vc->paste_wait);
2734 }
2735
2736 /*
2737 * Turn the Scroll-Lock LED on when the tty is stopped
2738 */
2739 static void con_stop(struct tty_struct *tty)
2740 {
2741 int console_num;
2742 if (!tty)
2743 return;
2744 console_num = tty->index;
2745 if (!vc_cons_allocated(console_num))
2746 return;
2747 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2748 set_leds();
2749 }
2750
2751 /*
2752 * Turn the Scroll-Lock LED off when the console is started
2753 */
2754 static void con_start(struct tty_struct *tty)
2755 {
2756 int console_num;
2757 if (!tty)
2758 return;
2759 console_num = tty->index;
2760 if (!vc_cons_allocated(console_num))
2761 return;
2762 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2763 set_leds();
2764 }
2765
2766 static void con_flush_chars(struct tty_struct *tty)
2767 {
2768 struct vc_data *vc;
2769
2770 if (in_interrupt()) /* from flush_to_ldisc */
2771 return;
2772
2773 /* if we race with con_close(), vt may be null */
2774 acquire_console_sem();
2775 vc = tty->driver_data;
2776 if (vc)
2777 set_cursor(vc);
2778 release_console_sem();
2779 }
2780
2781 /*
2782 * Allocate the console screen memory.
2783 */
2784 static int con_open(struct tty_struct *tty, struct file *filp)
2785 {
2786 unsigned int currcons = tty->index;
2787 int ret = 0;
2788
2789 acquire_console_sem();
2790 if (tty->driver_data == NULL) {
2791 ret = vc_allocate(currcons);
2792 if (ret == 0) {
2793 struct vc_data *vc = vc_cons[currcons].d;
2794
2795 /* Still being freed */
2796 if (vc->vc_tty) {
2797 release_console_sem();
2798 return -ERESTARTSYS;
2799 }
2800 tty->driver_data = vc;
2801 vc->vc_tty = tty;
2802
2803 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2804 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2805 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2806 }
2807 if (vc->vc_utf)
2808 tty->termios->c_iflag |= IUTF8;
2809 else
2810 tty->termios->c_iflag &= ~IUTF8;
2811 release_console_sem();
2812 return ret;
2813 }
2814 }
2815 release_console_sem();
2816 return ret;
2817 }
2818
2819 static void con_close(struct tty_struct *tty, struct file *filp)
2820 {
2821 /* Nothing to do - we defer to shutdown */
2822 }
2823
2824 static void con_shutdown(struct tty_struct *tty)
2825 {
2826 struct vc_data *vc = tty->driver_data;
2827 BUG_ON(vc == NULL);
2828 acquire_console_sem();
2829 vc->vc_tty = NULL;
2830 release_console_sem();
2831 tty_shutdown(tty);
2832 }
2833
2834 static int default_italic_color = 2; // green (ASCII)
2835 static int default_underline_color = 3; // cyan (ASCII)
2836 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2837 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2838
2839 static void vc_init(struct vc_data *vc, unsigned int rows,
2840 unsigned int cols, int do_clear)
2841 {
2842 int j, k ;
2843
2844 vc->vc_cols = cols;
2845 vc->vc_rows = rows;
2846 vc->vc_size_row = cols << 1;
2847 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2848
2849 set_origin(vc);
2850 vc->vc_pos = vc->vc_origin;
2851 reset_vc(vc);
2852 for (j=k=0; j<16; j++) {
2853 vc->vc_palette[k++] = default_red[j] ;
2854 vc->vc_palette[k++] = default_grn[j] ;
2855 vc->vc_palette[k++] = default_blu[j] ;
2856 }
2857 vc->vc_def_color = 0x07; /* white */
2858 vc->vc_ulcolor = default_underline_color;
2859 vc->vc_itcolor = default_italic_color;
2860 vc->vc_halfcolor = 0x08; /* grey */
2861 init_waitqueue_head(&vc->paste_wait);
2862 reset_terminal(vc, do_clear);
2863 }
2864
2865 /*
2866 * This routine initializes console interrupts, and does nothing
2867 * else. If you want the screen to clear, call tty_write with
2868 * the appropriate escape-sequence.
2869 */
2870
2871 static int __init con_init(void)
2872 {
2873 const char *display_desc = NULL;
2874 struct vc_data *vc;
2875 unsigned int currcons = 0, i;
2876
2877 acquire_console_sem();
2878
2879 if (conswitchp)
2880 display_desc = conswitchp->con_startup();
2881 if (!display_desc) {
2882 fg_console = 0;
2883 release_console_sem();
2884 return 0;
2885 }
2886
2887 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2888 struct con_driver *con_driver = &registered_con_driver[i];
2889
2890 if (con_driver->con == NULL) {
2891 con_driver->con = conswitchp;
2892 con_driver->desc = display_desc;
2893 con_driver->flag = CON_DRIVER_FLAG_INIT;
2894 con_driver->first = 0;
2895 con_driver->last = MAX_NR_CONSOLES - 1;
2896 break;
2897 }
2898 }
2899
2900 for (i = 0; i < MAX_NR_CONSOLES; i++)
2901 con_driver_map[i] = conswitchp;
2902
2903 if (blankinterval) {
2904 blank_state = blank_normal_wait;
2905 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2906 }
2907
2908 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2909 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2910 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2911 visual_init(vc, currcons, 1);
2912 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2913 vc_init(vc, vc->vc_rows, vc->vc_cols,
2914 currcons || !vc->vc_sw->con_save_screen);
2915 }
2916 currcons = fg_console = 0;
2917 master_display_fg = vc = vc_cons[currcons].d;
2918 set_origin(vc);
2919 save_screen(vc);
2920 gotoxy(vc, vc->vc_x, vc->vc_y);
2921 csi_J(vc, 0);
2922 update_screen(vc);
2923 printk("Console: %s %s %dx%d",
2924 vc->vc_can_do_color ? "colour" : "mono",
2925 display_desc, vc->vc_cols, vc->vc_rows);
2926 printable = 1;
2927 printk("\n");
2928
2929 release_console_sem();
2930
2931 #ifdef CONFIG_VT_CONSOLE
2932 register_console(&vt_console_driver);
2933 #endif
2934 return 0;
2935 }
2936 console_initcall(con_init);
2937
2938 static const struct tty_operations con_ops = {
2939 .open = con_open,
2940 .close = con_close,
2941 .write = con_write,
2942 .write_room = con_write_room,
2943 .put_char = con_put_char,
2944 .flush_chars = con_flush_chars,
2945 .chars_in_buffer = con_chars_in_buffer,
2946 .ioctl = vt_ioctl,
2947 #ifdef CONFIG_COMPAT
2948 .compat_ioctl = vt_compat_ioctl,
2949 #endif
2950 .stop = con_stop,
2951 .start = con_start,
2952 .throttle = con_throttle,
2953 .unthrottle = con_unthrottle,
2954 .resize = vt_resize,
2955 .shutdown = con_shutdown
2956 };
2957
2958 static struct cdev vc0_cdev;
2959
2960 int __init vty_init(const struct file_operations *console_fops)
2961 {
2962 cdev_init(&vc0_cdev, console_fops);
2963 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2964 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2965 panic("Couldn't register /dev/tty0 driver\n");
2966 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2967
2968 vcs_init();
2969
2970 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2971 if (!console_driver)
2972 panic("Couldn't allocate console driver\n");
2973 console_driver->owner = THIS_MODULE;
2974 console_driver->name = "tty";
2975 console_driver->name_base = 1;
2976 console_driver->major = TTY_MAJOR;
2977 console_driver->minor_start = 1;
2978 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2979 console_driver->init_termios = tty_std_termios;
2980 if (default_utf8)
2981 console_driver->init_termios.c_iflag |= IUTF8;
2982 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2983 tty_set_operations(console_driver, &con_ops);
2984 if (tty_register_driver(console_driver))
2985 panic("Couldn't register console driver\n");
2986 kbd_init();
2987 console_map_init();
2988 #ifdef CONFIG_MDA_CONSOLE
2989 mda_console_init();
2990 #endif
2991 return 0;
2992 }
2993
2994 #ifndef VT_SINGLE_DRIVER
2995
2996 static struct class *vtconsole_class;
2997
2998 static int bind_con_driver(const struct consw *csw, int first, int last,
2999 int deflt)
3000 {
3001 struct module *owner = csw->owner;
3002 const char *desc = NULL;
3003 struct con_driver *con_driver;
3004 int i, j = -1, k = -1, retval = -ENODEV;
3005
3006 if (!try_module_get(owner))
3007 return -ENODEV;
3008
3009 acquire_console_sem();
3010
3011 /* check if driver is registered */
3012 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3013 con_driver = &registered_con_driver[i];
3014
3015 if (con_driver->con == csw) {
3016 desc = con_driver->desc;
3017 retval = 0;
3018 break;
3019 }
3020 }
3021
3022 if (retval)
3023 goto err;
3024
3025 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3026 csw->con_startup();
3027 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3028 }
3029
3030 if (deflt) {
3031 if (conswitchp)
3032 module_put(conswitchp->owner);
3033
3034 __module_get(owner);
3035 conswitchp = csw;
3036 }
3037
3038 first = max(first, con_driver->first);
3039 last = min(last, con_driver->last);
3040
3041 for (i = first; i <= last; i++) {
3042 int old_was_color;
3043 struct vc_data *vc = vc_cons[i].d;
3044
3045 if (con_driver_map[i])
3046 module_put(con_driver_map[i]->owner);
3047 __module_get(owner);
3048 con_driver_map[i] = csw;
3049
3050 if (!vc || !vc->vc_sw)
3051 continue;
3052
3053 j = i;
3054
3055 if (CON_IS_VISIBLE(vc)) {
3056 k = i;
3057 save_screen(vc);
3058 }
3059
3060 old_was_color = vc->vc_can_do_color;
3061 vc->vc_sw->con_deinit(vc);
3062 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3063 visual_init(vc, i, 0);
3064 set_origin(vc);
3065 update_attr(vc);
3066
3067 /* If the console changed between mono <-> color, then
3068 * the attributes in the screenbuf will be wrong. The
3069 * following resets all attributes to something sane.
3070 */
3071 if (old_was_color != vc->vc_can_do_color)
3072 clear_buffer_attributes(vc);
3073 }
3074
3075 printk("Console: switching ");
3076 if (!deflt)
3077 printk("consoles %d-%d ", first+1, last+1);
3078 if (j >= 0) {
3079 struct vc_data *vc = vc_cons[j].d;
3080
3081 printk("to %s %s %dx%d\n",
3082 vc->vc_can_do_color ? "colour" : "mono",
3083 desc, vc->vc_cols, vc->vc_rows);
3084
3085 if (k >= 0) {
3086 vc = vc_cons[k].d;
3087 update_screen(vc);
3088 }
3089 } else
3090 printk("to %s\n", desc);
3091
3092 retval = 0;
3093 err:
3094 release_console_sem();
3095 module_put(owner);
3096 return retval;
3097 };
3098
3099 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3100 static int con_is_graphics(const struct consw *csw, int first, int last)
3101 {
3102 int i, retval = 0;
3103
3104 for (i = first; i <= last; i++) {
3105 struct vc_data *vc = vc_cons[i].d;
3106
3107 if (vc && vc->vc_mode == KD_GRAPHICS) {
3108 retval = 1;
3109 break;
3110 }
3111 }
3112
3113 return retval;
3114 }
3115
3116 /**
3117 * unbind_con_driver - unbind a console driver
3118 * @csw: pointer to console driver to unregister
3119 * @first: first in range of consoles that @csw should be unbound from
3120 * @last: last in range of consoles that @csw should be unbound from
3121 * @deflt: should next bound console driver be default after @csw is unbound?
3122 *
3123 * To unbind a driver from all possible consoles, pass 0 as @first and
3124 * %MAX_NR_CONSOLES as @last.
3125 *
3126 * @deflt controls whether the console that ends up replacing @csw should be
3127 * the default console.
3128 *
3129 * RETURNS:
3130 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3131 * or 0 on success.
3132 */
3133 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3134 {
3135 struct module *owner = csw->owner;
3136 const struct consw *defcsw = NULL;
3137 struct con_driver *con_driver = NULL, *con_back = NULL;
3138 int i, retval = -ENODEV;
3139
3140 if (!try_module_get(owner))
3141 return -ENODEV;
3142
3143 acquire_console_sem();
3144
3145 /* check if driver is registered and if it is unbindable */
3146 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3147 con_driver = &registered_con_driver[i];
3148
3149 if (con_driver->con == csw &&
3150 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3151 retval = 0;
3152 break;
3153 }
3154 }
3155
3156 if (retval) {
3157 release_console_sem();
3158 goto err;
3159 }
3160
3161 retval = -ENODEV;
3162
3163 /* check if backup driver exists */
3164 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3165 con_back = &registered_con_driver[i];
3166
3167 if (con_back->con &&
3168 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3169 defcsw = con_back->con;
3170 retval = 0;
3171 break;
3172 }
3173 }
3174
3175 if (retval) {
3176 release_console_sem();
3177 goto err;
3178 }
3179
3180 if (!con_is_bound(csw)) {
3181 release_console_sem();
3182 goto err;
3183 }
3184
3185 first = max(first, con_driver->first);
3186 last = min(last, con_driver->last);
3187
3188 for (i = first; i <= last; i++) {
3189 if (con_driver_map[i] == csw) {
3190 module_put(csw->owner);
3191 con_driver_map[i] = NULL;
3192 }
3193 }
3194
3195 if (!con_is_bound(defcsw)) {
3196 const struct consw *defconsw = conswitchp;
3197
3198 defcsw->con_startup();
3199 con_back->flag |= CON_DRIVER_FLAG_INIT;
3200 /*
3201 * vgacon may change the default driver to point
3202 * to dummycon, we restore it here...
3203 */
3204 conswitchp = defconsw;
3205 }
3206
3207 if (!con_is_bound(csw))
3208 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3209
3210 release_console_sem();
3211 /* ignore return value, binding should not fail */
3212 bind_con_driver(defcsw, first, last, deflt);
3213 err:
3214 module_put(owner);
3215 return retval;
3216
3217 }
3218 EXPORT_SYMBOL(unbind_con_driver);
3219
3220 static int vt_bind(struct con_driver *con)
3221 {
3222 const struct consw *defcsw = NULL, *csw = NULL;
3223 int i, more = 1, first = -1, last = -1, deflt = 0;
3224
3225 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3226 con_is_graphics(con->con, con->first, con->last))
3227 goto err;
3228
3229 csw = con->con;
3230
3231 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3232 struct con_driver *con = &registered_con_driver[i];
3233
3234 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3235 defcsw = con->con;
3236 break;
3237 }
3238 }
3239
3240 if (!defcsw)
3241 goto err;
3242
3243 while (more) {
3244 more = 0;
3245
3246 for (i = con->first; i <= con->last; i++) {
3247 if (con_driver_map[i] == defcsw) {
3248 if (first == -1)
3249 first = i;
3250 last = i;
3251 more = 1;
3252 } else if (first != -1)
3253 break;
3254 }
3255
3256 if (first == 0 && last == MAX_NR_CONSOLES -1)
3257 deflt = 1;
3258
3259 if (first != -1)
3260 bind_con_driver(csw, first, last, deflt);
3261
3262 first = -1;
3263 last = -1;
3264 deflt = 0;
3265 }
3266
3267 err:
3268 return 0;
3269 }
3270
3271 static int vt_unbind(struct con_driver *con)
3272 {
3273 const struct consw *csw = NULL;
3274 int i, more = 1, first = -1, last = -1, deflt = 0;
3275
3276 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3277 con_is_graphics(con->con, con->first, con->last))
3278 goto err;
3279
3280 csw = con->con;
3281
3282 while (more) {
3283 more = 0;
3284
3285 for (i = con->first; i <= con->last; i++) {
3286 if (con_driver_map[i] == csw) {
3287 if (first == -1)
3288 first = i;
3289 last = i;
3290 more = 1;
3291 } else if (first != -1)
3292 break;
3293 }
3294
3295 if (first == 0 && last == MAX_NR_CONSOLES -1)
3296 deflt = 1;
3297
3298 if (first != -1)
3299 unbind_con_driver(csw, first, last, deflt);
3300
3301 first = -1;
3302 last = -1;
3303 deflt = 0;
3304 }
3305
3306 err:
3307 return 0;
3308 }
3309 #else
3310 static inline int vt_bind(struct con_driver *con)
3311 {
3312 return 0;
3313 }
3314 static inline int vt_unbind(struct con_driver *con)
3315 {
3316 return 0;
3317 }
3318 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3319
3320 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3321 const char *buf, size_t count)
3322 {
3323 struct con_driver *con = dev_get_drvdata(dev);
3324 int bind = simple_strtoul(buf, NULL, 0);
3325
3326 if (bind)
3327 vt_bind(con);
3328 else
3329 vt_unbind(con);
3330
3331 return count;
3332 }
3333
3334 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3335 char *buf)
3336 {
3337 struct con_driver *con = dev_get_drvdata(dev);
3338 int bind = con_is_bound(con->con);
3339
3340 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3341 }
3342
3343 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3344 char *buf)
3345 {
3346 struct con_driver *con = dev_get_drvdata(dev);
3347
3348 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3349 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3350 con->desc);
3351
3352 }
3353
3354 static struct device_attribute device_attrs[] = {
3355 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3356 __ATTR(name, S_IRUGO, show_name, NULL),
3357 };
3358
3359 static int vtconsole_init_device(struct con_driver *con)
3360 {
3361 int i;
3362 int error = 0;
3363
3364 con->flag |= CON_DRIVER_FLAG_ATTR;
3365 dev_set_drvdata(con->dev, con);
3366 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3367 error = device_create_file(con->dev, &device_attrs[i]);
3368 if (error)
3369 break;
3370 }
3371
3372 if (error) {
3373 while (--i >= 0)
3374 device_remove_file(con->dev, &device_attrs[i]);
3375 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3376 }
3377
3378 return error;
3379 }
3380
3381 static void vtconsole_deinit_device(struct con_driver *con)
3382 {
3383 int i;
3384
3385 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3386 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3387 device_remove_file(con->dev, &device_attrs[i]);
3388 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3389 }
3390 }
3391
3392 /**
3393 * con_is_bound - checks if driver is bound to the console
3394 * @csw: console driver
3395 *
3396 * RETURNS: zero if unbound, nonzero if bound
3397 *
3398 * Drivers can call this and if zero, they should release
3399 * all resources allocated on con_startup()
3400 */
3401 int con_is_bound(const struct consw *csw)
3402 {
3403 int i, bound = 0;
3404
3405 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3406 if (con_driver_map[i] == csw) {
3407 bound = 1;
3408 break;
3409 }
3410 }
3411
3412 return bound;
3413 }
3414 EXPORT_SYMBOL(con_is_bound);
3415
3416 /**
3417 * register_con_driver - register console driver to console layer
3418 * @csw: console driver
3419 * @first: the first console to take over, minimum value is 0
3420 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3421 *
3422 * DESCRIPTION: This function registers a console driver which can later
3423 * bind to a range of consoles specified by @first and @last. It will
3424 * also initialize the console driver by calling con_startup().
3425 */
3426 int register_con_driver(const struct consw *csw, int first, int last)
3427 {
3428 struct module *owner = csw->owner;
3429 struct con_driver *con_driver;
3430 const char *desc;
3431 int i, retval = 0;
3432
3433 if (!try_module_get(owner))
3434 return -ENODEV;
3435
3436 acquire_console_sem();
3437
3438 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3439 con_driver = &registered_con_driver[i];
3440
3441 /* already registered */
3442 if (con_driver->con == csw)
3443 retval = -EINVAL;
3444 }
3445
3446 if (retval)
3447 goto err;
3448
3449 desc = csw->con_startup();
3450
3451 if (!desc)
3452 goto err;
3453
3454 retval = -EINVAL;
3455
3456 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3457 con_driver = &registered_con_driver[i];
3458
3459 if (con_driver->con == NULL) {
3460 con_driver->con = csw;
3461 con_driver->desc = desc;
3462 con_driver->node = i;
3463 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3464 CON_DRIVER_FLAG_INIT;
3465 con_driver->first = first;
3466 con_driver->last = last;
3467 retval = 0;
3468 break;
3469 }
3470 }
3471
3472 if (retval)
3473 goto err;
3474
3475 con_driver->dev = device_create(vtconsole_class, NULL,
3476 MKDEV(0, con_driver->node),
3477 NULL, "vtcon%i",
3478 con_driver->node);
3479
3480 if (IS_ERR(con_driver->dev)) {
3481 printk(KERN_WARNING "Unable to create device for %s; "
3482 "errno = %ld\n", con_driver->desc,
3483 PTR_ERR(con_driver->dev));
3484 con_driver->dev = NULL;
3485 } else {
3486 vtconsole_init_device(con_driver);
3487 }
3488
3489 err:
3490 release_console_sem();
3491 module_put(owner);
3492 return retval;
3493 }
3494 EXPORT_SYMBOL(register_con_driver);
3495
3496 /**
3497 * unregister_con_driver - unregister console driver from console layer
3498 * @csw: console driver
3499 *
3500 * DESCRIPTION: All drivers that registers to the console layer must
3501 * call this function upon exit, or if the console driver is in a state
3502 * where it won't be able to handle console services, such as the
3503 * framebuffer console without loaded framebuffer drivers.
3504 *
3505 * The driver must unbind first prior to unregistration.
3506 */
3507 int unregister_con_driver(const struct consw *csw)
3508 {
3509 int i, retval = -ENODEV;
3510
3511 acquire_console_sem();
3512
3513 /* cannot unregister a bound driver */
3514 if (con_is_bound(csw))
3515 goto err;
3516
3517 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3518 struct con_driver *con_driver = &registered_con_driver[i];
3519
3520 if (con_driver->con == csw &&
3521 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3522 vtconsole_deinit_device(con_driver);
3523 device_destroy(vtconsole_class,
3524 MKDEV(0, con_driver->node));
3525 con_driver->con = NULL;
3526 con_driver->desc = NULL;
3527 con_driver->dev = NULL;
3528 con_driver->node = 0;
3529 con_driver->flag = 0;
3530 con_driver->first = 0;
3531 con_driver->last = 0;
3532 retval = 0;
3533 break;
3534 }
3535 }
3536 err:
3537 release_console_sem();
3538 return retval;
3539 }
3540 EXPORT_SYMBOL(unregister_con_driver);
3541
3542 /*
3543 * If we support more console drivers, this function is used
3544 * when a driver wants to take over some existing consoles
3545 * and become default driver for newly opened ones.
3546 *
3547 * take_over_console is basically a register followed by unbind
3548 */
3549 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3550 {
3551 int err;
3552
3553 err = register_con_driver(csw, first, last);
3554
3555 if (!err)
3556 bind_con_driver(csw, first, last, deflt);
3557
3558 return err;
3559 }
3560
3561 /*
3562 * give_up_console is a wrapper to unregister_con_driver. It will only
3563 * work if driver is fully unbound.
3564 */
3565 void give_up_console(const struct consw *csw)
3566 {
3567 unregister_con_driver(csw);
3568 }
3569
3570 static int __init vtconsole_class_init(void)
3571 {
3572 int i;
3573
3574 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3575 if (IS_ERR(vtconsole_class)) {
3576 printk(KERN_WARNING "Unable to create vt console class; "
3577 "errno = %ld\n", PTR_ERR(vtconsole_class));
3578 vtconsole_class = NULL;
3579 }
3580
3581 /* Add system drivers to sysfs */
3582 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3583 struct con_driver *con = &registered_con_driver[i];
3584
3585 if (con->con && !con->dev) {
3586 con->dev = device_create(vtconsole_class, NULL,
3587 MKDEV(0, con->node),
3588 NULL, "vtcon%i",
3589 con->node);
3590
3591 if (IS_ERR(con->dev)) {
3592 printk(KERN_WARNING "Unable to create "
3593 "device for %s; errno = %ld\n",
3594 con->desc, PTR_ERR(con->dev));
3595 con->dev = NULL;
3596 } else {
3597 vtconsole_init_device(con);
3598 }
3599 }
3600 }
3601
3602 return 0;
3603 }
3604 postcore_initcall(vtconsole_class_init);
3605
3606 #endif
3607
3608 /*
3609 * Screen blanking
3610 */
3611
3612 static int set_vesa_blanking(char __user *p)
3613 {
3614 unsigned int mode;
3615
3616 if (get_user(mode, p + 1))
3617 return -EFAULT;
3618
3619 vesa_blank_mode = (mode < 4) ? mode : 0;
3620 return 0;
3621 }
3622
3623 void do_blank_screen(int entering_gfx)
3624 {
3625 struct vc_data *vc = vc_cons[fg_console].d;
3626 int i;
3627
3628 WARN_CONSOLE_UNLOCKED();
3629
3630 if (console_blanked) {
3631 if (blank_state == blank_vesa_wait) {
3632 blank_state = blank_off;
3633 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3634 }
3635 return;
3636 }
3637
3638 /* entering graphics mode? */
3639 if (entering_gfx) {
3640 hide_cursor(vc);
3641 save_screen(vc);
3642 vc->vc_sw->con_blank(vc, -1, 1);
3643 console_blanked = fg_console + 1;
3644 blank_state = blank_off;
3645 set_origin(vc);
3646 return;
3647 }
3648
3649 if (blank_state != blank_normal_wait)
3650 return;
3651 blank_state = blank_off;
3652
3653 /* don't blank graphics */
3654 if (vc->vc_mode != KD_TEXT) {
3655 console_blanked = fg_console + 1;
3656 return;
3657 }
3658
3659 hide_cursor(vc);
3660 del_timer_sync(&console_timer);
3661 blank_timer_expired = 0;
3662
3663 save_screen(vc);
3664 /* In case we need to reset origin, blanking hook returns 1 */
3665 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3666 console_blanked = fg_console + 1;
3667 if (i)
3668 set_origin(vc);
3669
3670 if (console_blank_hook && console_blank_hook(1))
3671 return;
3672
3673 if (vesa_off_interval && vesa_blank_mode) {
3674 blank_state = blank_vesa_wait;
3675 mod_timer(&console_timer, jiffies + vesa_off_interval);
3676 }
3677 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3678 }
3679 EXPORT_SYMBOL(do_blank_screen);
3680
3681 /*
3682 * Called by timer as well as from vt_console_driver
3683 */
3684 void do_unblank_screen(int leaving_gfx)
3685 {
3686 struct vc_data *vc;
3687
3688 /* This should now always be called from a "sane" (read: can schedule)
3689 * context for the sake of the low level drivers, except in the special
3690 * case of oops_in_progress
3691 */
3692 if (!oops_in_progress)
3693 might_sleep();
3694
3695 WARN_CONSOLE_UNLOCKED();
3696
3697 ignore_poke = 0;
3698 if (!console_blanked)
3699 return;
3700 if (!vc_cons_allocated(fg_console)) {
3701 /* impossible */
3702 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3703 return;
3704 }
3705 vc = vc_cons[fg_console].d;
3706 if (vc->vc_mode != KD_TEXT)
3707 return; /* but leave console_blanked != 0 */
3708
3709 if (blankinterval) {
3710 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3711 blank_state = blank_normal_wait;
3712 }
3713
3714 console_blanked = 0;
3715 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3716 /* Low-level driver cannot restore -> do it ourselves */
3717 update_screen(vc);
3718 if (console_blank_hook)
3719 console_blank_hook(0);
3720 set_palette(vc);
3721 set_cursor(vc);
3722 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3723 }
3724 EXPORT_SYMBOL(do_unblank_screen);
3725
3726 /*
3727 * This is called by the outside world to cause a forced unblank, mostly for
3728 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3729 * call it with 1 as an argument and so force a mode restore... that may kill
3730 * X or at least garbage the screen but would also make the Oops visible...
3731 */
3732 void unblank_screen(void)
3733 {
3734 do_unblank_screen(0);
3735 }
3736
3737 /*
3738 * We defer the timer blanking to work queue so it can take the console mutex
3739 * (console operations can still happen at irq time, but only from printk which
3740 * has the console mutex. Not perfect yet, but better than no locking
3741 */
3742 static void blank_screen_t(unsigned long dummy)
3743 {
3744 if (unlikely(!keventd_up())) {
3745 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3746 return;
3747 }
3748 blank_timer_expired = 1;
3749 schedule_work(&console_work);
3750 }
3751
3752 void poke_blanked_console(void)
3753 {
3754 WARN_CONSOLE_UNLOCKED();
3755
3756 /* Add this so we quickly catch whoever might call us in a non
3757 * safe context. Nowadays, unblank_screen() isn't to be called in
3758 * atomic contexts and is allowed to schedule (with the special case
3759 * of oops_in_progress, but that isn't of any concern for this
3760 * function. --BenH.
3761 */
3762 might_sleep();
3763
3764 /* This isn't perfectly race free, but a race here would be mostly harmless,
3765 * at worse, we'll do a spurrious blank and it's unlikely
3766 */
3767 del_timer(&console_timer);
3768 blank_timer_expired = 0;
3769
3770 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3771 return;
3772 if (console_blanked)
3773 unblank_screen();
3774 else if (blankinterval) {
3775 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3776 blank_state = blank_normal_wait;
3777 }
3778 }
3779
3780 /*
3781 * Palettes
3782 */
3783
3784 static void set_palette(struct vc_data *vc)
3785 {
3786 WARN_CONSOLE_UNLOCKED();
3787
3788 if (vc->vc_mode != KD_GRAPHICS)
3789 vc->vc_sw->con_set_palette(vc, color_table);
3790 }
3791
3792 static int set_get_cmap(unsigned char __user *arg, int set)
3793 {
3794 int i, j, k;
3795
3796 WARN_CONSOLE_UNLOCKED();
3797
3798 for (i = 0; i < 16; i++)
3799 if (set) {
3800 get_user(default_red[i], arg++);
3801 get_user(default_grn[i], arg++);
3802 get_user(default_blu[i], arg++);
3803 } else {
3804 put_user(default_red[i], arg++);
3805 put_user(default_grn[i], arg++);
3806 put_user(default_blu[i], arg++);
3807 }
3808 if (set) {
3809 for (i = 0; i < MAX_NR_CONSOLES; i++)
3810 if (vc_cons_allocated(i)) {
3811 for (j = k = 0; j < 16; j++) {
3812 vc_cons[i].d->vc_palette[k++] = default_red[j];
3813 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3814 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3815 }
3816 set_palette(vc_cons[i].d);
3817 }
3818 }
3819 return 0;
3820 }
3821
3822 /*
3823 * Load palette into the DAC registers. arg points to a colour
3824 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3825 */
3826
3827 int con_set_cmap(unsigned char __user *arg)
3828 {
3829 int rc;
3830
3831 acquire_console_sem();
3832 rc = set_get_cmap (arg,1);
3833 release_console_sem();
3834
3835 return rc;
3836 }
3837
3838 int con_get_cmap(unsigned char __user *arg)
3839 {
3840 int rc;
3841
3842 acquire_console_sem();
3843 rc = set_get_cmap (arg,0);
3844 release_console_sem();
3845
3846 return rc;
3847 }
3848
3849 void reset_palette(struct vc_data *vc)
3850 {
3851 int j, k;
3852 for (j=k=0; j<16; j++) {
3853 vc->vc_palette[k++] = default_red[j];
3854 vc->vc_palette[k++] = default_grn[j];
3855 vc->vc_palette[k++] = default_blu[j];
3856 }
3857 set_palette(vc);
3858 }
3859
3860 /*
3861 * Font switching
3862 *
3863 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3864 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3865 * depending on width) reserved for each character which is kinda wasty, but
3866 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3867 * is upto the actual low-level console-driver convert data into its favorite
3868 * format (maybe we should add a `fontoffset' field to the `display'
3869 * structure so we won't have to convert the fontdata all the time.
3870 * /Jes
3871 */
3872
3873 #define max_font_size 65536
3874
3875 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3876 {
3877 struct console_font font;
3878 int rc = -EINVAL;
3879 int c;
3880
3881 if (vc->vc_mode != KD_TEXT)
3882 return -EINVAL;
3883
3884 if (op->data) {
3885 font.data = kmalloc(max_font_size, GFP_KERNEL);
3886 if (!font.data)
3887 return -ENOMEM;
3888 } else
3889 font.data = NULL;
3890
3891 acquire_console_sem();
3892 if (vc->vc_sw->con_font_get)
3893 rc = vc->vc_sw->con_font_get(vc, &font);
3894 else
3895 rc = -ENOSYS;
3896 release_console_sem();
3897
3898 if (rc)
3899 goto out;
3900
3901 c = (font.width+7)/8 * 32 * font.charcount;
3902
3903 if (op->data && font.charcount > op->charcount)
3904 rc = -ENOSPC;
3905 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3906 if (font.width > op->width || font.height > op->height)
3907 rc = -ENOSPC;
3908 } else {
3909 if (font.width != 8)
3910 rc = -EIO;
3911 else if ((op->height && font.height > op->height) ||
3912 font.height > 32)
3913 rc = -ENOSPC;
3914 }
3915 if (rc)
3916 goto out;
3917
3918 op->height = font.height;
3919 op->width = font.width;
3920 op->charcount = font.charcount;
3921
3922 if (op->data && copy_to_user(op->data, font.data, c))
3923 rc = -EFAULT;
3924
3925 out:
3926 kfree(font.data);
3927 return rc;
3928 }
3929
3930 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3931 {
3932 struct console_font font;
3933 int rc = -EINVAL;
3934 int size;
3935
3936 if (vc->vc_mode != KD_TEXT)
3937 return -EINVAL;
3938 if (!op->data)
3939 return -EINVAL;
3940 if (op->charcount > 512)
3941 return -EINVAL;
3942 if (!op->height) { /* Need to guess font height [compat] */
3943 int h, i;
3944 u8 __user *charmap = op->data;
3945 u8 tmp;
3946
3947 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3948 so that we can get rid of this soon */
3949 if (!(op->flags & KD_FONT_FLAG_OLD))
3950 return -EINVAL;
3951 for (h = 32; h > 0; h--)
3952 for (i = 0; i < op->charcount; i++) {
3953 if (get_user(tmp, &charmap[32*i+h-1]))
3954 return -EFAULT;
3955 if (tmp)
3956 goto nonzero;
3957 }
3958 return -EINVAL;
3959 nonzero:
3960 op->height = h;
3961 }
3962 if (op->width <= 0 || op->width > 32 || op->height > 32)
3963 return -EINVAL;
3964 size = (op->width+7)/8 * 32 * op->charcount;
3965 if (size > max_font_size)
3966 return -ENOSPC;
3967 font.charcount = op->charcount;
3968 font.height = op->height;
3969 font.width = op->width;
3970 font.data = kmalloc(size, GFP_KERNEL);
3971 if (!font.data)
3972 return -ENOMEM;
3973 if (copy_from_user(font.data, op->data, size)) {
3974 kfree(font.data);
3975 return -EFAULT;
3976 }
3977 acquire_console_sem();
3978 if (vc->vc_sw->con_font_set)
3979 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3980 else
3981 rc = -ENOSYS;
3982 release_console_sem();
3983 kfree(font.data);
3984 return rc;
3985 }
3986
3987 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3988 {
3989 struct console_font font = {.width = op->width, .height = op->height};
3990 char name[MAX_FONT_NAME];
3991 char *s = name;
3992 int rc;
3993
3994 if (vc->vc_mode != KD_TEXT)
3995 return -EINVAL;
3996
3997 if (!op->data)
3998 s = NULL;
3999 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4000 return -EFAULT;
4001 else
4002 name[MAX_FONT_NAME - 1] = 0;
4003
4004 acquire_console_sem();
4005 if (vc->vc_sw->con_font_default)
4006 rc = vc->vc_sw->con_font_default(vc, &font, s);
4007 else
4008 rc = -ENOSYS;
4009 release_console_sem();
4010 if (!rc) {
4011 op->width = font.width;
4012 op->height = font.height;
4013 }
4014 return rc;
4015 }
4016
4017 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4018 {
4019 int con = op->height;
4020 int rc;
4021
4022 if (vc->vc_mode != KD_TEXT)
4023 return -EINVAL;
4024
4025 acquire_console_sem();
4026 if (!vc->vc_sw->con_font_copy)
4027 rc = -ENOSYS;
4028 else if (con < 0 || !vc_cons_allocated(con))
4029 rc = -ENOTTY;
4030 else if (con == vc->vc_num) /* nothing to do */
4031 rc = 0;
4032 else
4033 rc = vc->vc_sw->con_font_copy(vc, con);
4034 release_console_sem();
4035 return rc;
4036 }
4037
4038 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4039 {
4040 switch (op->op) {
4041 case KD_FONT_OP_SET:
4042 return con_font_set(vc, op);
4043 case KD_FONT_OP_GET:
4044 return con_font_get(vc, op);
4045 case KD_FONT_OP_SET_DEFAULT:
4046 return con_font_default(vc, op);
4047 case KD_FONT_OP_COPY:
4048 return con_font_copy(vc, op);
4049 }
4050 return -ENOSYS;
4051 }
4052
4053 /*
4054 * Interface exported to selection and vcs.
4055 */
4056
4057 /* used by selection */
4058 u16 screen_glyph(struct vc_data *vc, int offset)
4059 {
4060 u16 w = scr_readw(screenpos(vc, offset, 1));
4061 u16 c = w & 0xff;
4062
4063 if (w & vc->vc_hi_font_mask)
4064 c |= 0x100;
4065 return c;
4066 }
4067 EXPORT_SYMBOL_GPL(screen_glyph);
4068
4069 /* used by vcs - note the word offset */
4070 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4071 {
4072 return screenpos(vc, 2 * w_offset, viewed);
4073 }
4074
4075 void getconsxy(struct vc_data *vc, unsigned char *p)
4076 {
4077 p[0] = vc->vc_x;
4078 p[1] = vc->vc_y;
4079 }
4080
4081 void putconsxy(struct vc_data *vc, unsigned char *p)
4082 {
4083 hide_cursor(vc);
4084 gotoxy(vc, p[0], p[1]);
4085 set_cursor(vc);
4086 }
4087
4088 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4089 {
4090 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4091 return softcursor_original;
4092 return scr_readw(org);
4093 }
4094
4095 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4096 {
4097 scr_writew(val, org);
4098 if ((unsigned long)org == vc->vc_pos) {
4099 softcursor_original = -1;
4100 add_softcursor(vc);
4101 }
4102 }
4103
4104 /*
4105 * Visible symbols for modules
4106 */
4107
4108 EXPORT_SYMBOL(color_table);
4109 EXPORT_SYMBOL(default_red);
4110 EXPORT_SYMBOL(default_grn);
4111 EXPORT_SYMBOL(default_blu);
4112 EXPORT_SYMBOL(update_region);
4113 EXPORT_SYMBOL(redraw_screen);
4114 EXPORT_SYMBOL(vc_resize);
4115 EXPORT_SYMBOL(fg_console);
4116 EXPORT_SYMBOL(console_blank_hook);
4117 EXPORT_SYMBOL(console_blanked);
4118 EXPORT_SYMBOL(vc_cons);
4119 EXPORT_SYMBOL(global_cursor_default);
4120 #ifndef VT_SINGLE_DRIVER
4121 EXPORT_SYMBOL(take_over_console);
4122 EXPORT_SYMBOL(give_up_console);
4123 #endif