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ACPI: thinkpad-acpi: bump up version to 0.17
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / vt.c
blob1bbb45b937fd2abbfe028ab47807d49384ee0419
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/vt_kern.h>
90 #include <linux/selection.h>
91 #include <linux/tiocl.h>
92 #include <linux/kbd_kern.h>
93 #include <linux/consolemap.h>
94 #include <linux/timer.h>
95 #include <linux/interrupt.h>
96 #include <linux/workqueue.h>
97 #include <linux/bootmem.h>
98 #include <linux/pm.h>
99 #include <linux/font.h>
100 #include <linux/bitops.h>
101
102 #include <asm/io.h>
103 #include <asm/system.h>
104 #include <asm/uaccess.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111
112 struct con_driver {
113 const struct consw *con;
114 const char *desc;
115 struct device *dev;
116 int node;
117 int first;
118 int last;
119 int flag;
120 };
121
122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
123 const struct consw *conswitchp;
124
125 /* A bitmap for codes <32. A bit of 1 indicates that the code
126 * corresponding to that bit number invokes some special action
127 * (such as cursor movement) and should not be displayed as a
128 * glyph unless the disp_ctrl mode is explicitly enabled.
129 */
130 #define CTRL_ACTION 0x0d00ff81
131 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
132
133 /*
134 * Here is the default bell parameters: 750HZ, 1/8th of a second
135 */
136 #define DEFAULT_BELL_PITCH 750
137 #define DEFAULT_BELL_DURATION (HZ/8)
138
139 struct vc vc_cons [MAX_NR_CONSOLES];
140
141 #ifndef VT_SINGLE_DRIVER
142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143 #endif
144
145 static int con_open(struct tty_struct *, struct file *);
146 static void vc_init(struct vc_data *vc, unsigned int rows,
147 unsigned int cols, int do_clear);
148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149 static void save_cur(struct vc_data *vc);
150 static void reset_terminal(struct vc_data *vc, int do_clear);
151 static void con_flush_chars(struct tty_struct *tty);
152 static int set_vesa_blanking(char __user *p);
153 static void set_cursor(struct vc_data *vc);
154 static void hide_cursor(struct vc_data *vc);
155 static void console_callback(struct work_struct *ignored);
156 static void blank_screen_t(unsigned long dummy);
157 static void set_palette(struct vc_data *vc);
158
159 static int printable; /* Is console ready for printing? */
160
161 /*
162 * ignore_poke: don't unblank the screen when things are typed. This is
163 * mainly for the privacy of braille terminal users.
164 */
165 static int ignore_poke;
166
167 int do_poke_blanked_console;
168 int console_blanked;
169
170 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
171 static int blankinterval = 10*60*HZ;
172 static int vesa_off_interval;
173
174 static DECLARE_WORK(console_work, console_callback);
175
176 /*
177 * fg_console is the current virtual console,
178 * last_console is the last used one,
179 * want_console is the console we want to switch to,
180 * kmsg_redirect is the console for kernel messages,
181 */
182 int fg_console;
183 int last_console;
184 int want_console = -1;
185 int kmsg_redirect;
186
187 /*
188 * For each existing display, we have a pointer to console currently visible
189 * on that display, allowing consoles other than fg_console to be refreshed
190 * appropriately. Unless the low-level driver supplies its own display_fg
191 * variable, we use this one for the "master display".
192 */
193 static struct vc_data *master_display_fg;
194
195 /*
196 * Unfortunately, we need to delay tty echo when we're currently writing to the
197 * console since the code is (and always was) not re-entrant, so we schedule
198 * all flip requests to process context with schedule-task() and run it from
199 * console_callback().
200 */
201
202 /*
203 * For the same reason, we defer scrollback to the console callback.
204 */
205 static int scrollback_delta;
206
207 /*
208 * Hook so that the power management routines can (un)blank
209 * the console on our behalf.
210 */
211 int (*console_blank_hook)(int);
212
213 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
214 static int blank_state;
215 static int blank_timer_expired;
216 enum {
217 blank_off = 0,
218 blank_normal_wait,
219 blank_vesa_wait,
220 };
221
222 /*
223 * Low-Level Functions
224 */
225
226 #define IS_FG(vc) ((vc)->vc_num == fg_console)
227
228 #ifdef VT_BUF_VRAM_ONLY
229 #define DO_UPDATE(vc) 0
230 #else
231 #define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
232 #endif
233
234 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
235 {
236 unsigned short *p;
237
238 if (!viewed)
239 p = (unsigned short *)(vc->vc_origin + offset);
240 else if (!vc->vc_sw->con_screen_pos)
241 p = (unsigned short *)(vc->vc_visible_origin + offset);
242 else
243 p = vc->vc_sw->con_screen_pos(vc, offset);
244 return p;
245 }
246
247 static inline void scrolldelta(int lines)
248 {
249 scrollback_delta += lines;
250 schedule_console_callback();
251 }
252
253 void schedule_console_callback(void)
254 {
255 schedule_work(&console_work);
256 }
257
258 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
259 {
260 unsigned short *d, *s;
261
262 if (t+nr >= b)
263 nr = b - t - 1;
264 if (b > vc->vc_rows || t >= b || nr < 1)
265 return;
266 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
267 return;
268 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
269 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
270 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
271 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
272 vc->vc_size_row * nr);
273 }
274
275 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
276 {
277 unsigned short *s;
278 unsigned int step;
279
280 if (t+nr >= b)
281 nr = b - t - 1;
282 if (b > vc->vc_rows || t >= b || nr < 1)
283 return;
284 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
285 return;
286 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
287 step = vc->vc_cols * nr;
288 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
289 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
290 }
291
292 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
293 {
294 #ifndef VT_BUF_VRAM_ONLY
295 unsigned int xx, yy, offset;
296 u16 *p;
297
298 p = (u16 *) start;
299 if (!vc->vc_sw->con_getxy) {
300 offset = (start - vc->vc_origin) / 2;
301 xx = offset % vc->vc_cols;
302 yy = offset / vc->vc_cols;
303 } else {
304 int nxx, nyy;
305 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
306 xx = nxx; yy = nyy;
307 }
308 for(;;) {
309 u16 attrib = scr_readw(p) & 0xff00;
310 int startx = xx;
311 u16 *q = p;
312 while (xx < vc->vc_cols && count) {
313 if (attrib != (scr_readw(p) & 0xff00)) {
314 if (p > q)
315 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
316 startx = xx;
317 q = p;
318 attrib = scr_readw(p) & 0xff00;
319 }
320 p++;
321 xx++;
322 count--;
323 }
324 if (p > q)
325 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
326 if (!count)
327 break;
328 xx = 0;
329 yy++;
330 if (vc->vc_sw->con_getxy) {
331 p = (u16 *)start;
332 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
333 }
334 }
335 #endif
336 }
337
338 void update_region(struct vc_data *vc, unsigned long start, int count)
339 {
340 WARN_CONSOLE_UNLOCKED();
341
342 if (DO_UPDATE(vc)) {
343 hide_cursor(vc);
344 do_update_region(vc, start, count);
345 set_cursor(vc);
346 }
347 }
348
349 /* Structure of attributes is hardware-dependent */
350
351 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
352 {
353 if (vc->vc_sw->con_build_attr)
354 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
355
356 #ifndef VT_BUF_VRAM_ONLY
357 /*
358 * ++roman: I completely changed the attribute format for monochrome
359 * mode (!can_do_color). The formerly used MDA (monochrome display
360 * adapter) format didn't allow the combination of certain effects.
361 * Now the attribute is just a bit vector:
362 * Bit 0..1: intensity (0..2)
363 * Bit 2 : underline
364 * Bit 3 : reverse
365 * Bit 7 : blink
366 */
367 {
368 u8 a = vc->vc_color;
369 if (!vc->vc_can_do_color)
370 return _intensity |
371 (_underline ? 4 : 0) |
372 (_reverse ? 8 : 0) |
373 (_blink ? 0x80 : 0);
374 if (_underline)
375 a = (a & 0xf0) | vc->vc_ulcolor;
376 else if (_intensity == 0)
377 a = (a & 0xf0) | vc->vc_ulcolor;
378 if (_reverse)
379 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
380 if (_blink)
381 a ^= 0x80;
382 if (_intensity == 2)
383 a ^= 0x08;
384 if (vc->vc_hi_font_mask == 0x100)
385 a <<= 1;
386 return a;
387 }
388 #else
389 return 0;
390 #endif
391 }
392
393 static void update_attr(struct vc_data *vc)
394 {
395 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
396 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
397 }
398
399 /* Note: inverting the screen twice should revert to the original state */
400 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
401 {
402 unsigned short *p;
403
404 WARN_CONSOLE_UNLOCKED();
405
406 count /= 2;
407 p = screenpos(vc, offset, viewed);
408 if (vc->vc_sw->con_invert_region)
409 vc->vc_sw->con_invert_region(vc, p, count);
410 #ifndef VT_BUF_VRAM_ONLY
411 else {
412 u16 *q = p;
413 int cnt = count;
414 u16 a;
415
416 if (!vc->vc_can_do_color) {
417 while (cnt--) {
418 a = scr_readw(q);
419 a ^= 0x0800;
420 scr_writew(a, q);
421 q++;
422 }
423 } else if (vc->vc_hi_font_mask == 0x100) {
424 while (cnt--) {
425 a = scr_readw(q);
426 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
427 scr_writew(a, q);
428 q++;
429 }
430 } else {
431 while (cnt--) {
432 a = scr_readw(q);
433 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
434 scr_writew(a, q);
435 q++;
436 }
437 }
438 }
439 #endif
440 if (DO_UPDATE(vc))
441 do_update_region(vc, (unsigned long) p, count);
442 }
443
444 /* used by selection: complement pointer position */
445 void complement_pos(struct vc_data *vc, int offset)
446 {
447 static int old_offset = -1;
448 static unsigned short old;
449 static unsigned short oldx, oldy;
450
451 WARN_CONSOLE_UNLOCKED();
452
453 if (old_offset != -1 && old_offset >= 0 &&
454 old_offset < vc->vc_screenbuf_size) {
455 scr_writew(old, screenpos(vc, old_offset, 1));
456 if (DO_UPDATE(vc))
457 vc->vc_sw->con_putc(vc, old, oldy, oldx);
458 }
459
460 old_offset = offset;
461
462 if (offset != -1 && offset >= 0 &&
463 offset < vc->vc_screenbuf_size) {
464 unsigned short new;
465 unsigned short *p;
466 p = screenpos(vc, offset, 1);
467 old = scr_readw(p);
468 new = old ^ vc->vc_complement_mask;
469 scr_writew(new, p);
470 if (DO_UPDATE(vc)) {
471 oldx = (offset >> 1) % vc->vc_cols;
472 oldy = (offset >> 1) / vc->vc_cols;
473 vc->vc_sw->con_putc(vc, new, oldy, oldx);
474 }
475 }
476
477 }
478
479 static void insert_char(struct vc_data *vc, unsigned int nr)
480 {
481 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
482
483 p = q + vc->vc_cols - nr - vc->vc_x;
484 while (--p >= q)
485 scr_writew(scr_readw(p), p + nr);
486 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
487 vc->vc_need_wrap = 0;
488 if (DO_UPDATE(vc)) {
489 unsigned short oldattr = vc->vc_attr;
490 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
491 vc->vc_cols - vc->vc_x - nr);
492 vc->vc_attr = vc->vc_video_erase_char >> 8;
493 while (nr--)
494 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
495 vc->vc_attr = oldattr;
496 }
497 }
498
499 static void delete_char(struct vc_data *vc, unsigned int nr)
500 {
501 unsigned int i = vc->vc_x;
502 unsigned short *p = (unsigned short *)vc->vc_pos;
503
504 while (++i <= vc->vc_cols - nr) {
505 scr_writew(scr_readw(p+nr), p);
506 p++;
507 }
508 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
509 vc->vc_need_wrap = 0;
510 if (DO_UPDATE(vc)) {
511 unsigned short oldattr = vc->vc_attr;
512 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
513 vc->vc_cols - vc->vc_x - nr);
514 vc->vc_attr = vc->vc_video_erase_char >> 8;
515 while (nr--)
516 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
517 vc->vc_cols - 1 - nr);
518 vc->vc_attr = oldattr;
519 }
520 }
521
522 static int softcursor_original;
523
524 static void add_softcursor(struct vc_data *vc)
525 {
526 int i = scr_readw((u16 *) vc->vc_pos);
527 u32 type = vc->vc_cursor_type;
528
529 if (! (type & 0x10)) return;
530 if (softcursor_original != -1) return;
531 softcursor_original = i;
532 i |= ((type >> 8) & 0xff00 );
533 i ^= ((type) & 0xff00 );
534 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
535 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
536 scr_writew(i, (u16 *) vc->vc_pos);
537 if (DO_UPDATE(vc))
538 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
539 }
540
541 static void hide_softcursor(struct vc_data *vc)
542 {
543 if (softcursor_original != -1) {
544 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
545 if (DO_UPDATE(vc))
546 vc->vc_sw->con_putc(vc, softcursor_original,
547 vc->vc_y, vc->vc_x);
548 softcursor_original = -1;
549 }
550 }
551
552 static void hide_cursor(struct vc_data *vc)
553 {
554 if (vc == sel_cons)
555 clear_selection();
556 vc->vc_sw->con_cursor(vc, CM_ERASE);
557 hide_softcursor(vc);
558 }
559
560 static void set_cursor(struct vc_data *vc)
561 {
562 if (!IS_FG(vc) || console_blanked ||
563 vc->vc_mode == KD_GRAPHICS)
564 return;
565 if (vc->vc_deccm) {
566 if (vc == sel_cons)
567 clear_selection();
568 add_softcursor(vc);
569 if ((vc->vc_cursor_type & 0x0f) != 1)
570 vc->vc_sw->con_cursor(vc, CM_DRAW);
571 } else
572 hide_cursor(vc);
573 }
574
575 static void set_origin(struct vc_data *vc)
576 {
577 WARN_CONSOLE_UNLOCKED();
578
579 if (!CON_IS_VISIBLE(vc) ||
580 !vc->vc_sw->con_set_origin ||
581 !vc->vc_sw->con_set_origin(vc))
582 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
583 vc->vc_visible_origin = vc->vc_origin;
584 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
585 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
586 }
587
588 static inline void save_screen(struct vc_data *vc)
589 {
590 WARN_CONSOLE_UNLOCKED();
591
592 if (vc->vc_sw->con_save_screen)
593 vc->vc_sw->con_save_screen(vc);
594 }
595
596 /*
597 * Redrawing of screen
598 */
599
600 static void clear_buffer_attributes(struct vc_data *vc)
601 {
602 unsigned short *p = (unsigned short *)vc->vc_origin;
603 int count = vc->vc_screenbuf_size / 2;
604 int mask = vc->vc_hi_font_mask | 0xff;
605
606 for (; count > 0; count--, p++) {
607 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
608 }
609 }
610
611 void redraw_screen(struct vc_data *vc, int is_switch)
612 {
613 int redraw = 0;
614
615 WARN_CONSOLE_UNLOCKED();
616
617 if (!vc) {
618 /* strange ... */
619 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
620 return;
621 }
622
623 if (is_switch) {
624 struct vc_data *old_vc = vc_cons[fg_console].d;
625 if (old_vc == vc)
626 return;
627 if (!CON_IS_VISIBLE(vc))
628 redraw = 1;
629 *vc->vc_display_fg = vc;
630 fg_console = vc->vc_num;
631 hide_cursor(old_vc);
632 if (!CON_IS_VISIBLE(old_vc)) {
633 save_screen(old_vc);
634 set_origin(old_vc);
635 }
636 } else {
637 hide_cursor(vc);
638 redraw = 1;
639 }
640
641 if (redraw) {
642 int update;
643 int old_was_color = vc->vc_can_do_color;
644
645 set_origin(vc);
646 update = vc->vc_sw->con_switch(vc);
647 set_palette(vc);
648 /*
649 * If console changed from mono<->color, the best we can do
650 * is to clear the buffer attributes. As it currently stands,
651 * rebuilding new attributes from the old buffer is not doable
652 * without overly complex code.
653 */
654 if (old_was_color != vc->vc_can_do_color) {
655 update_attr(vc);
656 clear_buffer_attributes(vc);
657 }
658 if (update && vc->vc_mode != KD_GRAPHICS)
659 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
660 }
661 set_cursor(vc);
662 if (is_switch) {
663 set_leds();
664 compute_shiftstate();
665 }
666 }
667
668 /*
669 * Allocation, freeing and resizing of VTs.
670 */
671
672 int vc_cons_allocated(unsigned int i)
673 {
674 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
675 }
676
677 static void visual_init(struct vc_data *vc, int num, int init)
678 {
679 /* ++Geert: vc->vc_sw->con_init determines console size */
680 if (vc->vc_sw)
681 module_put(vc->vc_sw->owner);
682 vc->vc_sw = conswitchp;
683 #ifndef VT_SINGLE_DRIVER
684 if (con_driver_map[num])
685 vc->vc_sw = con_driver_map[num];
686 #endif
687 __module_get(vc->vc_sw->owner);
688 vc->vc_num = num;
689 vc->vc_display_fg = &master_display_fg;
690 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
691 vc->vc_uni_pagedir = 0;
692 vc->vc_hi_font_mask = 0;
693 vc->vc_complement_mask = 0;
694 vc->vc_can_do_color = 0;
695 vc->vc_sw->con_init(vc, init);
696 if (!vc->vc_complement_mask)
697 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
698 vc->vc_s_complement_mask = vc->vc_complement_mask;
699 vc->vc_size_row = vc->vc_cols << 1;
700 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
701 }
702
703 int vc_allocate(unsigned int currcons) /* return 0 on success */
704 {
705 WARN_CONSOLE_UNLOCKED();
706
707 if (currcons >= MAX_NR_CONSOLES)
708 return -ENXIO;
709 if (!vc_cons[currcons].d) {
710 struct vc_data *vc;
711
712 /* prevent users from taking too much memory */
713 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
714 return -EPERM;
715
716 /* due to the granularity of kmalloc, we waste some memory here */
717 /* the alloc is done in two steps, to optimize the common situation
718 of a 25x80 console (structsize=216, screenbuf_size=4000) */
719 /* although the numbers above are not valid since long ago, the
720 point is still up-to-date and the comment still has its value
721 even if only as a historical artifact. --mj, July 1998 */
722 vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
723 if (!vc)
724 return -ENOMEM;
725 memset(vc, 0, sizeof(*vc));
726 vc_cons[currcons].d = vc;
727 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
728 visual_init(vc, currcons, 1);
729 if (!*vc->vc_uni_pagedir_loc)
730 con_set_default_unimap(vc);
731 if (!vc->vc_kmalloced)
732 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
733 if (!vc->vc_screenbuf) {
734 kfree(vc);
735 vc_cons[currcons].d = NULL;
736 return -ENOMEM;
737 }
738 vc->vc_kmalloced = 1;
739 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
740 }
741 return 0;
742 }
743
744 static inline int resize_screen(struct vc_data *vc, int width, int height)
745 {
746 /* Resizes the resolution of the display adapater */
747 int err = 0;
748
749 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
750 err = vc->vc_sw->con_resize(vc, width, height);
751 return err;
752 }
753
754 /*
755 * Change # of rows and columns (0 means unchanged/the size of fg_console)
756 * [this is to be used together with some user program
757 * like resize that changes the hardware videomode]
758 */
759 #define VC_RESIZE_MAXCOL (32767)
760 #define VC_RESIZE_MAXROW (32767)
761 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
762 {
763 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
764 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
765 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
766 unsigned int end;
767 unsigned short *newscreen;
768
769 WARN_CONSOLE_UNLOCKED();
770
771 if (!vc)
772 return -ENXIO;
773
774 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
775 return -EINVAL;
776
777 new_cols = (cols ? cols : vc->vc_cols);
778 new_rows = (lines ? lines : vc->vc_rows);
779 new_row_size = new_cols << 1;
780 new_screen_size = new_row_size * new_rows;
781
782 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
783 return 0;
784
785 newscreen = kmalloc(new_screen_size, GFP_USER);
786 if (!newscreen)
787 return -ENOMEM;
788
789 old_rows = vc->vc_rows;
790 old_cols = vc->vc_cols;
791 old_row_size = vc->vc_size_row;
792 old_screen_size = vc->vc_screenbuf_size;
793
794 err = resize_screen(vc, new_cols, new_rows);
795 if (err) {
796 kfree(newscreen);
797 return err;
798 }
799
800 vc->vc_rows = new_rows;
801 vc->vc_cols = new_cols;
802 vc->vc_size_row = new_row_size;
803 vc->vc_screenbuf_size = new_screen_size;
804
805 rlth = min(old_row_size, new_row_size);
806 rrem = new_row_size - rlth;
807 old_origin = vc->vc_origin;
808 new_origin = (long) newscreen;
809 new_scr_end = new_origin + new_screen_size;
810
811 if (vc->vc_y > new_rows) {
812 if (old_rows - vc->vc_y < new_rows) {
813 /*
814 * Cursor near the bottom, copy contents from the
815 * bottom of buffer
816 */
817 old_origin += (old_rows - new_rows) * old_row_size;
818 end = vc->vc_scr_end;
819 } else {
820 /*
821 * Cursor is in no man's land, copy 1/2 screenful
822 * from the top and bottom of cursor position
823 */
824 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
825 end = old_origin + (old_row_size * new_rows);
826 }
827 } else
828 /*
829 * Cursor near the top, copy contents from the top of buffer
830 */
831 end = (old_rows > new_rows) ? old_origin +
832 (old_row_size * new_rows) :
833 vc->vc_scr_end;
834
835 update_attr(vc);
836
837 while (old_origin < end) {
838 scr_memcpyw((unsigned short *) new_origin,
839 (unsigned short *) old_origin, rlth);
840 if (rrem)
841 scr_memsetw((void *)(new_origin + rlth),
842 vc->vc_video_erase_char, rrem);
843 old_origin += old_row_size;
844 new_origin += new_row_size;
845 }
846 if (new_scr_end > new_origin)
847 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
848 new_scr_end - new_origin);
849 if (vc->vc_kmalloced)
850 kfree(vc->vc_screenbuf);
851 vc->vc_screenbuf = newscreen;
852 vc->vc_kmalloced = 1;
853 vc->vc_screenbuf_size = new_screen_size;
854 set_origin(vc);
855
856 /* do part of a reset_terminal() */
857 vc->vc_top = 0;
858 vc->vc_bottom = vc->vc_rows;
859 gotoxy(vc, vc->vc_x, vc->vc_y);
860 save_cur(vc);
861
862 if (vc->vc_tty) {
863 struct winsize ws, *cws = &vc->vc_tty->winsize;
864
865 memset(&ws, 0, sizeof(ws));
866 ws.ws_row = vc->vc_rows;
867 ws.ws_col = vc->vc_cols;
868 ws.ws_ypixel = vc->vc_scan_lines;
869 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
870 vc->vc_tty->pgrp)
871 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
872 *cws = ws;
873 }
874
875 if (CON_IS_VISIBLE(vc))
876 update_screen(vc);
877 return err;
878 }
879
880 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
881 {
882 int rc;
883
884 acquire_console_sem();
885 rc = vc_resize(vc, cols, lines);
886 release_console_sem();
887 return rc;
888 }
889
890 void vc_deallocate(unsigned int currcons)
891 {
892 WARN_CONSOLE_UNLOCKED();
893
894 if (vc_cons_allocated(currcons)) {
895 struct vc_data *vc = vc_cons[currcons].d;
896 vc->vc_sw->con_deinit(vc);
897 put_pid(vc->vt_pid);
898 module_put(vc->vc_sw->owner);
899 if (vc->vc_kmalloced)
900 kfree(vc->vc_screenbuf);
901 if (currcons >= MIN_NR_CONSOLES)
902 kfree(vc);
903 vc_cons[currcons].d = NULL;
904 }
905 }
906
907 /*
908 * VT102 emulator
909 */
910
911 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
912 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
913 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
914
915 #define decarm VC_REPEAT
916 #define decckm VC_CKMODE
917 #define kbdapplic VC_APPLIC
918 #define lnm VC_CRLF
919
920 /*
921 * this is what the terminal answers to a ESC-Z or csi0c query.
922 */
923 #define VT100ID "\033[?1;2c"
924 #define VT102ID "\033[?6c"
925
926 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
927 8,12,10,14, 9,13,11,15 };
928
929 /* the default colour table, for VGA+ colour systems */
930 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
931 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
932 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
933 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
934 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
935 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
936
937 /*
938 * gotoxy() must verify all boundaries, because the arguments
939 * might also be negative. If the given position is out of
940 * bounds, the cursor is placed at the nearest margin.
941 */
942 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
943 {
944 int min_y, max_y;
945
946 if (new_x < 0)
947 vc->vc_x = 0;
948 else {
949 if (new_x >= vc->vc_cols)
950 vc->vc_x = vc->vc_cols - 1;
951 else
952 vc->vc_x = new_x;
953 }
954
955 if (vc->vc_decom) {
956 min_y = vc->vc_top;
957 max_y = vc->vc_bottom;
958 } else {
959 min_y = 0;
960 max_y = vc->vc_rows;
961 }
962 if (new_y < min_y)
963 vc->vc_y = min_y;
964 else if (new_y >= max_y)
965 vc->vc_y = max_y - 1;
966 else
967 vc->vc_y = new_y;
968 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
969 vc->vc_need_wrap = 0;
970 }
971
972 /* for absolute user moves, when decom is set */
973 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
974 {
975 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
976 }
977
978 void scrollback(struct vc_data *vc, int lines)
979 {
980 if (!lines)
981 lines = vc->vc_rows / 2;
982 scrolldelta(-lines);
983 }
984
985 void scrollfront(struct vc_data *vc, int lines)
986 {
987 if (!lines)
988 lines = vc->vc_rows / 2;
989 scrolldelta(lines);
990 }
991
992 static void lf(struct vc_data *vc)
993 {
994 /* don't scroll if above bottom of scrolling region, or
995 * if below scrolling region
996 */
997 if (vc->vc_y + 1 == vc->vc_bottom)
998 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
999 else if (vc->vc_y < vc->vc_rows - 1) {
1000 vc->vc_y++;
1001 vc->vc_pos += vc->vc_size_row;
1002 }
1003 vc->vc_need_wrap = 0;
1004 }
1005
1006 static void ri(struct vc_data *vc)
1007 {
1008 /* don't scroll if below top of scrolling region, or
1009 * if above scrolling region
1010 */
1011 if (vc->vc_y == vc->vc_top)
1012 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1013 else if (vc->vc_y > 0) {
1014 vc->vc_y--;
1015 vc->vc_pos -= vc->vc_size_row;
1016 }
1017 vc->vc_need_wrap = 0;
1018 }
1019
1020 static inline void cr(struct vc_data *vc)
1021 {
1022 vc->vc_pos -= vc->vc_x << 1;
1023 vc->vc_need_wrap = vc->vc_x = 0;
1024 }
1025
1026 static inline void bs(struct vc_data *vc)
1027 {
1028 if (vc->vc_x) {
1029 vc->vc_pos -= 2;
1030 vc->vc_x--;
1031 vc->vc_need_wrap = 0;
1032 }
1033 }
1034
1035 static inline void del(struct vc_data *vc)
1036 {
1037 /* ignored */
1038 }
1039
1040 static void csi_J(struct vc_data *vc, int vpar)
1041 {
1042 unsigned int count;
1043 unsigned short * start;
1044
1045 switch (vpar) {
1046 case 0: /* erase from cursor to end of display */
1047 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1048 start = (unsigned short *)vc->vc_pos;
1049 if (DO_UPDATE(vc)) {
1050 /* do in two stages */
1051 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1052 vc->vc_cols - vc->vc_x);
1053 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1054 vc->vc_rows - vc->vc_y - 1,
1055 vc->vc_cols);
1056 }
1057 break;
1058 case 1: /* erase from start to cursor */
1059 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1060 start = (unsigned short *)vc->vc_origin;
1061 if (DO_UPDATE(vc)) {
1062 /* do in two stages */
1063 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1064 vc->vc_cols);
1065 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1066 vc->vc_x + 1);
1067 }
1068 break;
1069 case 2: /* erase whole display */
1070 count = vc->vc_cols * vc->vc_rows;
1071 start = (unsigned short *)vc->vc_origin;
1072 if (DO_UPDATE(vc))
1073 vc->vc_sw->con_clear(vc, 0, 0,
1074 vc->vc_rows,
1075 vc->vc_cols);
1076 break;
1077 default:
1078 return;
1079 }
1080 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1081 vc->vc_need_wrap = 0;
1082 }
1083
1084 static void csi_K(struct vc_data *vc, int vpar)
1085 {
1086 unsigned int count;
1087 unsigned short * start;
1088
1089 switch (vpar) {
1090 case 0: /* erase from cursor to end of line */
1091 count = vc->vc_cols - vc->vc_x;
1092 start = (unsigned short *)vc->vc_pos;
1093 if (DO_UPDATE(vc))
1094 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1095 vc->vc_cols - vc->vc_x);
1096 break;
1097 case 1: /* erase from start of line to cursor */
1098 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1099 count = vc->vc_x + 1;
1100 if (DO_UPDATE(vc))
1101 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1102 vc->vc_x + 1);
1103 break;
1104 case 2: /* erase whole line */
1105 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1106 count = vc->vc_cols;
1107 if (DO_UPDATE(vc))
1108 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1109 vc->vc_cols);
1110 break;
1111 default:
1112 return;
1113 }
1114 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1115 vc->vc_need_wrap = 0;
1116 }
1117
1118 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1119 { /* not vt100? */
1120 int count;
1121
1122 if (!vpar)
1123 vpar++;
1124 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1125
1126 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1127 if (DO_UPDATE(vc))
1128 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1129 vc->vc_need_wrap = 0;
1130 }
1131
1132 static void default_attr(struct vc_data *vc)
1133 {
1134 vc->vc_intensity = 1;
1135 vc->vc_underline = 0;
1136 vc->vc_reverse = 0;
1137 vc->vc_blink = 0;
1138 vc->vc_color = vc->vc_def_color;
1139 }
1140
1141 /* console_sem is held */
1142 static void csi_m(struct vc_data *vc)
1143 {
1144 int i;
1145
1146 for (i = 0; i <= vc->vc_npar; i++)
1147 switch (vc->vc_par[i]) {
1148 case 0: /* all attributes off */
1149 default_attr(vc);
1150 break;
1151 case 1:
1152 vc->vc_intensity = 2;
1153 break;
1154 case 2:
1155 vc->vc_intensity = 0;
1156 break;
1157 case 4:
1158 vc->vc_underline = 1;
1159 break;
1160 case 5:
1161 vc->vc_blink = 1;
1162 break;
1163 case 7:
1164 vc->vc_reverse = 1;
1165 break;
1166 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1167 * Select primary font, don't display
1168 * control chars if defined, don't set
1169 * bit 8 on output.
1170 */
1171 vc->vc_translate = set_translate(vc->vc_charset == 0
1172 ? vc->vc_G0_charset
1173 : vc->vc_G1_charset, vc);
1174 vc->vc_disp_ctrl = 0;
1175 vc->vc_toggle_meta = 0;
1176 break;
1177 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1178 * Select first alternate font, lets
1179 * chars < 32 be displayed as ROM chars.
1180 */
1181 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1182 vc->vc_disp_ctrl = 1;
1183 vc->vc_toggle_meta = 0;
1184 break;
1185 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1186 * Select second alternate font, toggle
1187 * high bit before displaying as ROM char.
1188 */
1189 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1190 vc->vc_disp_ctrl = 1;
1191 vc->vc_toggle_meta = 1;
1192 break;
1193 case 21:
1194 case 22:
1195 vc->vc_intensity = 1;
1196 break;
1197 case 24:
1198 vc->vc_underline = 0;
1199 break;
1200 case 25:
1201 vc->vc_blink = 0;
1202 break;
1203 case 27:
1204 vc->vc_reverse = 0;
1205 break;
1206 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1207 * Enables underscore, white foreground
1208 * with white underscore (Linux - use
1209 * default foreground).
1210 */
1211 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1212 vc->vc_underline = 1;
1213 break;
1214 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1215 * Disable underline option.
1216 * Reset colour to default? It did this
1217 * before...
1218 */
1219 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1220 vc->vc_underline = 0;
1221 break;
1222 case 49:
1223 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1224 break;
1225 default:
1226 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1227 vc->vc_color = color_table[vc->vc_par[i] - 30]
1228 | (vc->vc_color & 0xf0);
1229 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1230 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1231 | (vc->vc_color & 0x0f);
1232 break;
1233 }
1234 update_attr(vc);
1235 }
1236
1237 static void respond_string(const char *p, struct tty_struct *tty)
1238 {
1239 while (*p) {
1240 tty_insert_flip_char(tty, *p, 0);
1241 p++;
1242 }
1243 con_schedule_flip(tty);
1244 }
1245
1246 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1247 {
1248 char buf[40];
1249
1250 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1251 respond_string(buf, tty);
1252 }
1253
1254 static inline void status_report(struct tty_struct *tty)
1255 {
1256 respond_string("\033[0n", tty); /* Terminal ok */
1257 }
1258
1259 static inline void respond_ID(struct tty_struct * tty)
1260 {
1261 respond_string(VT102ID, tty);
1262 }
1263
1264 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1265 {
1266 char buf[8];
1267
1268 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1269 (char)('!' + mry));
1270 respond_string(buf, tty);
1271 }
1272
1273 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1274 int mouse_reporting(void)
1275 {
1276 return vc_cons[fg_console].d->vc_report_mouse;
1277 }
1278
1279 /* console_sem is held */
1280 static void set_mode(struct vc_data *vc, int on_off)
1281 {
1282 int i;
1283
1284 for (i = 0; i <= vc->vc_npar; i++)
1285 if (vc->vc_ques) {
1286 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1287 case 1: /* Cursor keys send ^[Ox/^[[x */
1288 if (on_off)
1289 set_kbd(vc, decckm);
1290 else
1291 clr_kbd(vc, decckm);
1292 break;
1293 case 3: /* 80/132 mode switch unimplemented */
1294 vc->vc_deccolm = on_off;
1295 #if 0
1296 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1297 /* this alone does not suffice; some user mode
1298 utility has to change the hardware regs */
1299 #endif
1300 break;
1301 case 5: /* Inverted screen on/off */
1302 if (vc->vc_decscnm != on_off) {
1303 vc->vc_decscnm = on_off;
1304 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1305 update_attr(vc);
1306 }
1307 break;
1308 case 6: /* Origin relative/absolute */
1309 vc->vc_decom = on_off;
1310 gotoxay(vc, 0, 0);
1311 break;
1312 case 7: /* Autowrap on/off */
1313 vc->vc_decawm = on_off;
1314 break;
1315 case 8: /* Autorepeat on/off */
1316 if (on_off)
1317 set_kbd(vc, decarm);
1318 else
1319 clr_kbd(vc, decarm);
1320 break;
1321 case 9:
1322 vc->vc_report_mouse = on_off ? 1 : 0;
1323 break;
1324 case 25: /* Cursor on/off */
1325 vc->vc_deccm = on_off;
1326 break;
1327 case 1000:
1328 vc->vc_report_mouse = on_off ? 2 : 0;
1329 break;
1330 }
1331 } else {
1332 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1333 case 3: /* Monitor (display ctrls) */
1334 vc->vc_disp_ctrl = on_off;
1335 break;
1336 case 4: /* Insert Mode on/off */
1337 vc->vc_decim = on_off;
1338 break;
1339 case 20: /* Lf, Enter == CrLf/Lf */
1340 if (on_off)
1341 set_kbd(vc, lnm);
1342 else
1343 clr_kbd(vc, lnm);
1344 break;
1345 }
1346 }
1347 }
1348
1349 /* console_sem is held */
1350 static void setterm_command(struct vc_data *vc)
1351 {
1352 switch(vc->vc_par[0]) {
1353 case 1: /* set color for underline mode */
1354 if (vc->vc_can_do_color &&
1355 vc->vc_par[1] < 16) {
1356 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1357 if (vc->vc_underline)
1358 update_attr(vc);
1359 }
1360 break;
1361 case 2: /* set color for half intensity mode */
1362 if (vc->vc_can_do_color &&
1363 vc->vc_par[1] < 16) {
1364 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1365 if (vc->vc_intensity == 0)
1366 update_attr(vc);
1367 }
1368 break;
1369 case 8: /* store colors as defaults */
1370 vc->vc_def_color = vc->vc_attr;
1371 if (vc->vc_hi_font_mask == 0x100)
1372 vc->vc_def_color >>= 1;
1373 default_attr(vc);
1374 update_attr(vc);
1375 break;
1376 case 9: /* set blanking interval */
1377 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1378 poke_blanked_console();
1379 break;
1380 case 10: /* set bell frequency in Hz */
1381 if (vc->vc_npar >= 1)
1382 vc->vc_bell_pitch = vc->vc_par[1];
1383 else
1384 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1385 break;
1386 case 11: /* set bell duration in msec */
1387 if (vc->vc_npar >= 1)
1388 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1389 vc->vc_par[1] * HZ / 1000 : 0;
1390 else
1391 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1392 break;
1393 case 12: /* bring specified console to the front */
1394 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1395 set_console(vc->vc_par[1] - 1);
1396 break;
1397 case 13: /* unblank the screen */
1398 poke_blanked_console();
1399 break;
1400 case 14: /* set vesa powerdown interval */
1401 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1402 break;
1403 case 15: /* activate the previous console */
1404 set_console(last_console);
1405 break;
1406 }
1407 }
1408
1409 /* console_sem is held */
1410 static void csi_at(struct vc_data *vc, unsigned int nr)
1411 {
1412 if (nr > vc->vc_cols - vc->vc_x)
1413 nr = vc->vc_cols - vc->vc_x;
1414 else if (!nr)
1415 nr = 1;
1416 insert_char(vc, nr);
1417 }
1418
1419 /* console_sem is held */
1420 static void csi_L(struct vc_data *vc, unsigned int nr)
1421 {
1422 if (nr > vc->vc_rows - vc->vc_y)
1423 nr = vc->vc_rows - vc->vc_y;
1424 else if (!nr)
1425 nr = 1;
1426 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1427 vc->vc_need_wrap = 0;
1428 }
1429
1430 /* console_sem is held */
1431 static void csi_P(struct vc_data *vc, unsigned int nr)
1432 {
1433 if (nr > vc->vc_cols - vc->vc_x)
1434 nr = vc->vc_cols - vc->vc_x;
1435 else if (!nr)
1436 nr = 1;
1437 delete_char(vc, nr);
1438 }
1439
1440 /* console_sem is held */
1441 static void csi_M(struct vc_data *vc, unsigned int nr)
1442 {
1443 if (nr > vc->vc_rows - vc->vc_y)
1444 nr = vc->vc_rows - vc->vc_y;
1445 else if (!nr)
1446 nr=1;
1447 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1448 vc->vc_need_wrap = 0;
1449 }
1450
1451 /* console_sem is held (except via vc_init->reset_terminal */
1452 static void save_cur(struct vc_data *vc)
1453 {
1454 vc->vc_saved_x = vc->vc_x;
1455 vc->vc_saved_y = vc->vc_y;
1456 vc->vc_s_intensity = vc->vc_intensity;
1457 vc->vc_s_underline = vc->vc_underline;
1458 vc->vc_s_blink = vc->vc_blink;
1459 vc->vc_s_reverse = vc->vc_reverse;
1460 vc->vc_s_charset = vc->vc_charset;
1461 vc->vc_s_color = vc->vc_color;
1462 vc->vc_saved_G0 = vc->vc_G0_charset;
1463 vc->vc_saved_G1 = vc->vc_G1_charset;
1464 }
1465
1466 /* console_sem is held */
1467 static void restore_cur(struct vc_data *vc)
1468 {
1469 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1470 vc->vc_intensity = vc->vc_s_intensity;
1471 vc->vc_underline = vc->vc_s_underline;
1472 vc->vc_blink = vc->vc_s_blink;
1473 vc->vc_reverse = vc->vc_s_reverse;
1474 vc->vc_charset = vc->vc_s_charset;
1475 vc->vc_color = vc->vc_s_color;
1476 vc->vc_G0_charset = vc->vc_saved_G0;
1477 vc->vc_G1_charset = vc->vc_saved_G1;
1478 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1479 update_attr(vc);
1480 vc->vc_need_wrap = 0;
1481 }
1482
1483 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1484 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1485 ESpalette };
1486
1487 /* console_sem is held (except via vc_init()) */
1488 static void reset_terminal(struct vc_data *vc, int do_clear)
1489 {
1490 vc->vc_top = 0;
1491 vc->vc_bottom = vc->vc_rows;
1492 vc->vc_state = ESnormal;
1493 vc->vc_ques = 0;
1494 vc->vc_translate = set_translate(LAT1_MAP, vc);
1495 vc->vc_G0_charset = LAT1_MAP;
1496 vc->vc_G1_charset = GRAF_MAP;
1497 vc->vc_charset = 0;
1498 vc->vc_need_wrap = 0;
1499 vc->vc_report_mouse = 0;
1500 vc->vc_utf = 0;
1501 vc->vc_utf_count = 0;
1502
1503 vc->vc_disp_ctrl = 0;
1504 vc->vc_toggle_meta = 0;
1505
1506 vc->vc_decscnm = 0;
1507 vc->vc_decom = 0;
1508 vc->vc_decawm = 1;
1509 vc->vc_deccm = 1;
1510 vc->vc_decim = 0;
1511
1512 set_kbd(vc, decarm);
1513 clr_kbd(vc, decckm);
1514 clr_kbd(vc, kbdapplic);
1515 clr_kbd(vc, lnm);
1516 kbd_table[vc->vc_num].lockstate = 0;
1517 kbd_table[vc->vc_num].slockstate = 0;
1518 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1519 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1520 /* do not do set_leds here because this causes an endless tasklet loop
1521 when the keyboard hasn't been initialized yet */
1522
1523 vc->vc_cursor_type = CUR_DEFAULT;
1524 vc->vc_complement_mask = vc->vc_s_complement_mask;
1525
1526 default_attr(vc);
1527 update_attr(vc);
1528
1529 vc->vc_tab_stop[0] = 0x01010100;
1530 vc->vc_tab_stop[1] =
1531 vc->vc_tab_stop[2] =
1532 vc->vc_tab_stop[3] =
1533 vc->vc_tab_stop[4] = 0x01010101;
1534
1535 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1536 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1537
1538 gotoxy(vc, 0, 0);
1539 save_cur(vc);
1540 if (do_clear)
1541 csi_J(vc, 2);
1542 }
1543
1544 /* console_sem is held */
1545 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1546 {
1547 /*
1548 * Control characters can be used in the _middle_
1549 * of an escape sequence.
1550 */
1551 switch (c) {
1552 case 0:
1553 return;
1554 case 7:
1555 if (vc->vc_bell_duration)
1556 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1557 return;
1558 case 8:
1559 bs(vc);
1560 return;
1561 case 9:
1562 vc->vc_pos -= (vc->vc_x << 1);
1563 while (vc->vc_x < vc->vc_cols - 1) {
1564 vc->vc_x++;
1565 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1566 break;
1567 }
1568 vc->vc_pos += (vc->vc_x << 1);
1569 return;
1570 case 10: case 11: case 12:
1571 lf(vc);
1572 if (!is_kbd(vc, lnm))
1573 return;
1574 case 13:
1575 cr(vc);
1576 return;
1577 case 14:
1578 vc->vc_charset = 1;
1579 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1580 vc->vc_disp_ctrl = 1;
1581 return;
1582 case 15:
1583 vc->vc_charset = 0;
1584 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1585 vc->vc_disp_ctrl = 0;
1586 return;
1587 case 24: case 26:
1588 vc->vc_state = ESnormal;
1589 return;
1590 case 27:
1591 vc->vc_state = ESesc;
1592 return;
1593 case 127:
1594 del(vc);
1595 return;
1596 case 128+27:
1597 vc->vc_state = ESsquare;
1598 return;
1599 }
1600 switch(vc->vc_state) {
1601 case ESesc:
1602 vc->vc_state = ESnormal;
1603 switch (c) {
1604 case '[':
1605 vc->vc_state = ESsquare;
1606 return;
1607 case ']':
1608 vc->vc_state = ESnonstd;
1609 return;
1610 case '%':
1611 vc->vc_state = ESpercent;
1612 return;
1613 case 'E':
1614 cr(vc);
1615 lf(vc);
1616 return;
1617 case 'M':
1618 ri(vc);
1619 return;
1620 case 'D':
1621 lf(vc);
1622 return;
1623 case 'H':
1624 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1625 return;
1626 case 'Z':
1627 respond_ID(tty);
1628 return;
1629 case '7':
1630 save_cur(vc);
1631 return;
1632 case '8':
1633 restore_cur(vc);
1634 return;
1635 case '(':
1636 vc->vc_state = ESsetG0;
1637 return;
1638 case ')':
1639 vc->vc_state = ESsetG1;
1640 return;
1641 case '#':
1642 vc->vc_state = EShash;
1643 return;
1644 case 'c':
1645 reset_terminal(vc, 1);
1646 return;
1647 case '>': /* Numeric keypad */
1648 clr_kbd(vc, kbdapplic);
1649 return;
1650 case '=': /* Appl. keypad */
1651 set_kbd(vc, kbdapplic);
1652 return;
1653 }
1654 return;
1655 case ESnonstd:
1656 if (c=='P') { /* palette escape sequence */
1657 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1658 vc->vc_par[vc->vc_npar] = 0;
1659 vc->vc_npar = 0;
1660 vc->vc_state = ESpalette;
1661 return;
1662 } else if (c=='R') { /* reset palette */
1663 reset_palette(vc);
1664 vc->vc_state = ESnormal;
1665 } else
1666 vc->vc_state = ESnormal;
1667 return;
1668 case ESpalette:
1669 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1670 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1671 if (vc->vc_npar == 7) {
1672 int i = vc->vc_par[0] * 3, j = 1;
1673 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1674 vc->vc_palette[i++] += vc->vc_par[j++];
1675 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1676 vc->vc_palette[i++] += vc->vc_par[j++];
1677 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678 vc->vc_palette[i] += vc->vc_par[j];
1679 set_palette(vc);
1680 vc->vc_state = ESnormal;
1681 }
1682 } else
1683 vc->vc_state = ESnormal;
1684 return;
1685 case ESsquare:
1686 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1687 vc->vc_par[vc->vc_npar] = 0;
1688 vc->vc_npar = 0;
1689 vc->vc_state = ESgetpars;
1690 if (c == '[') { /* Function key */
1691 vc->vc_state=ESfunckey;
1692 return;
1693 }
1694 vc->vc_ques = (c == '?');
1695 if (vc->vc_ques)
1696 return;
1697 case ESgetpars:
1698 if (c == ';' && vc->vc_npar < NPAR - 1) {
1699 vc->vc_npar++;
1700 return;
1701 } else if (c>='0' && c<='9') {
1702 vc->vc_par[vc->vc_npar] *= 10;
1703 vc->vc_par[vc->vc_npar] += c - '0';
1704 return;
1705 } else
1706 vc->vc_state = ESgotpars;
1707 case ESgotpars:
1708 vc->vc_state = ESnormal;
1709 switch(c) {
1710 case 'h':
1711 set_mode(vc, 1);
1712 return;
1713 case 'l':
1714 set_mode(vc, 0);
1715 return;
1716 case 'c':
1717 if (vc->vc_ques) {
1718 if (vc->vc_par[0])
1719 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1720 else
1721 vc->vc_cursor_type = CUR_DEFAULT;
1722 return;
1723 }
1724 break;
1725 case 'm':
1726 if (vc->vc_ques) {
1727 clear_selection();
1728 if (vc->vc_par[0])
1729 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1730 else
1731 vc->vc_complement_mask = vc->vc_s_complement_mask;
1732 return;
1733 }
1734 break;
1735 case 'n':
1736 if (!vc->vc_ques) {
1737 if (vc->vc_par[0] == 5)
1738 status_report(tty);
1739 else if (vc->vc_par[0] == 6)
1740 cursor_report(vc, tty);
1741 }
1742 return;
1743 }
1744 if (vc->vc_ques) {
1745 vc->vc_ques = 0;
1746 return;
1747 }
1748 switch(c) {
1749 case 'G': case '`':
1750 if (vc->vc_par[0])
1751 vc->vc_par[0]--;
1752 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1753 return;
1754 case 'A':
1755 if (!vc->vc_par[0])
1756 vc->vc_par[0]++;
1757 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1758 return;
1759 case 'B': case 'e':
1760 if (!vc->vc_par[0])
1761 vc->vc_par[0]++;
1762 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1763 return;
1764 case 'C': case 'a':
1765 if (!vc->vc_par[0])
1766 vc->vc_par[0]++;
1767 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1768 return;
1769 case 'D':
1770 if (!vc->vc_par[0])
1771 vc->vc_par[0]++;
1772 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1773 return;
1774 case 'E':
1775 if (!vc->vc_par[0])
1776 vc->vc_par[0]++;
1777 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1778 return;
1779 case 'F':
1780 if (!vc->vc_par[0])
1781 vc->vc_par[0]++;
1782 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1783 return;
1784 case 'd':
1785 if (vc->vc_par[0])
1786 vc->vc_par[0]--;
1787 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1788 return;
1789 case 'H': case 'f':
1790 if (vc->vc_par[0])
1791 vc->vc_par[0]--;
1792 if (vc->vc_par[1])
1793 vc->vc_par[1]--;
1794 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1795 return;
1796 case 'J':
1797 csi_J(vc, vc->vc_par[0]);
1798 return;
1799 case 'K':
1800 csi_K(vc, vc->vc_par[0]);
1801 return;
1802 case 'L':
1803 csi_L(vc, vc->vc_par[0]);
1804 return;
1805 case 'M':
1806 csi_M(vc, vc->vc_par[0]);
1807 return;
1808 case 'P':
1809 csi_P(vc, vc->vc_par[0]);
1810 return;
1811 case 'c':
1812 if (!vc->vc_par[0])
1813 respond_ID(tty);
1814 return;
1815 case 'g':
1816 if (!vc->vc_par[0])
1817 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1818 else if (vc->vc_par[0] == 3) {
1819 vc->vc_tab_stop[0] =
1820 vc->vc_tab_stop[1] =
1821 vc->vc_tab_stop[2] =
1822 vc->vc_tab_stop[3] =
1823 vc->vc_tab_stop[4] = 0;
1824 }
1825 return;
1826 case 'm':
1827 csi_m(vc);
1828 return;
1829 case 'q': /* DECLL - but only 3 leds */
1830 /* map 0,1,2,3 to 0,1,2,4 */
1831 if (vc->vc_par[0] < 4)
1832 setledstate(kbd_table + vc->vc_num,
1833 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1834 return;
1835 case 'r':
1836 if (!vc->vc_par[0])
1837 vc->vc_par[0]++;
1838 if (!vc->vc_par[1])
1839 vc->vc_par[1] = vc->vc_rows;
1840 /* Minimum allowed region is 2 lines */
1841 if (vc->vc_par[0] < vc->vc_par[1] &&
1842 vc->vc_par[1] <= vc->vc_rows) {
1843 vc->vc_top = vc->vc_par[0] - 1;
1844 vc->vc_bottom = vc->vc_par[1];
1845 gotoxay(vc, 0, 0);
1846 }
1847 return;
1848 case 's':
1849 save_cur(vc);
1850 return;
1851 case 'u':
1852 restore_cur(vc);
1853 return;
1854 case 'X':
1855 csi_X(vc, vc->vc_par[0]);
1856 return;
1857 case '@':
1858 csi_at(vc, vc->vc_par[0]);
1859 return;
1860 case ']': /* setterm functions */
1861 setterm_command(vc);
1862 return;
1863 }
1864 return;
1865 case ESpercent:
1866 vc->vc_state = ESnormal;
1867 switch (c) {
1868 case '@': /* defined in ISO 2022 */
1869 vc->vc_utf = 0;
1870 return;
1871 case 'G': /* prelim official escape code */
1872 case '8': /* retained for compatibility */
1873 vc->vc_utf = 1;
1874 return;
1875 }
1876 return;
1877 case ESfunckey:
1878 vc->vc_state = ESnormal;
1879 return;
1880 case EShash:
1881 vc->vc_state = ESnormal;
1882 if (c == '8') {
1883 /* DEC screen alignment test. kludge :-) */
1884 vc->vc_video_erase_char =
1885 (vc->vc_video_erase_char & 0xff00) | 'E';
1886 csi_J(vc, 2);
1887 vc->vc_video_erase_char =
1888 (vc->vc_video_erase_char & 0xff00) | ' ';
1889 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1890 }
1891 return;
1892 case ESsetG0:
1893 if (c == '0')
1894 vc->vc_G0_charset = GRAF_MAP;
1895 else if (c == 'B')
1896 vc->vc_G0_charset = LAT1_MAP;
1897 else if (c == 'U')
1898 vc->vc_G0_charset = IBMPC_MAP;
1899 else if (c == 'K')
1900 vc->vc_G0_charset = USER_MAP;
1901 if (vc->vc_charset == 0)
1902 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1903 vc->vc_state = ESnormal;
1904 return;
1905 case ESsetG1:
1906 if (c == '0')
1907 vc->vc_G1_charset = GRAF_MAP;
1908 else if (c == 'B')
1909 vc->vc_G1_charset = LAT1_MAP;
1910 else if (c == 'U')
1911 vc->vc_G1_charset = IBMPC_MAP;
1912 else if (c == 'K')
1913 vc->vc_G1_charset = USER_MAP;
1914 if (vc->vc_charset == 1)
1915 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1916 vc->vc_state = ESnormal;
1917 return;
1918 default:
1919 vc->vc_state = ESnormal;
1920 }
1921 }
1922
1923 /* This is a temporary buffer used to prepare a tty console write
1924 * so that we can easily avoid touching user space while holding the
1925 * console spinlock. It is allocated in con_init and is shared by
1926 * this code and the vc_screen read/write tty calls.
1927 *
1928 * We have to allocate this statically in the kernel data section
1929 * since console_init (and thus con_init) are called before any
1930 * kernel memory allocation is available.
1931 */
1932 char con_buf[CON_BUF_SIZE];
1933 DECLARE_MUTEX(con_buf_sem);
1934
1935 /* acquires console_sem */
1936 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1937 {
1938 #ifdef VT_BUF_VRAM_ONLY
1939 #define FLUSH do { } while(0);
1940 #else
1941 #define FLUSH if (draw_x >= 0) { \
1942 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1943 draw_x = -1; \
1944 }
1945 #endif
1946
1947 int c, tc, ok, n = 0, draw_x = -1;
1948 unsigned int currcons;
1949 unsigned long draw_from = 0, draw_to = 0;
1950 struct vc_data *vc;
1951 u16 himask, charmask;
1952 const unsigned char *orig_buf = NULL;
1953 int orig_count;
1954
1955 if (in_interrupt())
1956 return count;
1957
1958 might_sleep();
1959
1960 acquire_console_sem();
1961 vc = tty->driver_data;
1962 if (vc == NULL) {
1963 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1964 release_console_sem();
1965 return 0;
1966 }
1967
1968 currcons = vc->vc_num;
1969 if (!vc_cons_allocated(currcons)) {
1970 /* could this happen? */
1971 static int error = 0;
1972 if (!error) {
1973 error = 1;
1974 printk("con_write: tty %d not allocated\n", currcons+1);
1975 }
1976 release_console_sem();
1977 return 0;
1978 }
1979 release_console_sem();
1980
1981 orig_buf = buf;
1982 orig_count = count;
1983
1984 /* At this point 'buf' is guaranteed to be a kernel buffer
1985 * and therefore no access to userspace (and therefore sleeping)
1986 * will be needed. The con_buf_sem serializes all tty based
1987 * console rendering and vcs write/read operations. We hold
1988 * the console spinlock during the entire write.
1989 */
1990
1991 acquire_console_sem();
1992
1993 vc = tty->driver_data;
1994 if (vc == NULL) {
1995 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1996 release_console_sem();
1997 goto out;
1998 }
1999
2000 himask = vc->vc_hi_font_mask;
2001 charmask = himask ? 0x1ff : 0xff;
2002
2003 /* undraw cursor first */
2004 if (IS_FG(vc))
2005 hide_cursor(vc);
2006
2007 while (!tty->stopped && count) {
2008 int orig = *buf;
2009 c = orig;
2010 buf++;
2011 n++;
2012 count--;
2013
2014 /* Do no translation at all in control states */
2015 if (vc->vc_state != ESnormal) {
2016 tc = c;
2017 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2018 /* Combine UTF-8 into Unicode */
2019 /* Malformed sequences as sequences of replacement glyphs */
2020 rescan_last_byte:
2021 if(c > 0x7f) {
2022 if (vc->vc_utf_count) {
2023 if ((c & 0xc0) == 0x80) {
2024 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2025 if (--vc->vc_utf_count) {
2026 vc->vc_npar++;
2027 continue;
2028 }
2029 tc = c = vc->vc_utf_char;
2030 } else
2031 goto replacement_glyph;
2032 } else {
2033 vc->vc_npar = 0;
2034 if ((c & 0xe0) == 0xc0) {
2035 vc->vc_utf_count = 1;
2036 vc->vc_utf_char = (c & 0x1f);
2037 } else if ((c & 0xf0) == 0xe0) {
2038 vc->vc_utf_count = 2;
2039 vc->vc_utf_char = (c & 0x0f);
2040 } else if ((c & 0xf8) == 0xf0) {
2041 vc->vc_utf_count = 3;
2042 vc->vc_utf_char = (c & 0x07);
2043 } else if ((c & 0xfc) == 0xf8) {
2044 vc->vc_utf_count = 4;
2045 vc->vc_utf_char = (c & 0x03);
2046 } else if ((c & 0xfe) == 0xfc) {
2047 vc->vc_utf_count = 5;
2048 vc->vc_utf_char = (c & 0x01);
2049 } else
2050 goto replacement_glyph;
2051 continue;
2052 }
2053 } else {
2054 if (vc->vc_utf_count)
2055 goto replacement_glyph;
2056 tc = c;
2057 }
2058 } else { /* no utf or alternate charset mode */
2059 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2060 }
2061
2062 /* If the original code was a control character we
2063 * only allow a glyph to be displayed if the code is
2064 * not normally used (such as for cursor movement) or
2065 * if the disp_ctrl mode has been explicitly enabled.
2066 * Certain characters (as given by the CTRL_ALWAYS
2067 * bitmap) are always displayed as control characters,
2068 * as the console would be pretty useless without
2069 * them; to display an arbitrary font position use the
2070 * direct-to-font zone in UTF-8 mode.
2071 */
2072 ok = tc && (c >= 32 ||
2073 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2074 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2075 && (c != 127 || vc->vc_disp_ctrl)
2076 && (c != 128+27);
2077
2078 if (vc->vc_state == ESnormal && ok) {
2079 /* Now try to find out how to display it */
2080 tc = conv_uni_to_pc(vc, tc);
2081 if (tc & ~charmask) {
2082 if ( tc == -4 ) {
2083 /* If we got -4 (not found) then see if we have
2084 defined a replacement character (U+FFFD) */
2085 replacement_glyph:
2086 tc = conv_uni_to_pc(vc, 0xfffd);
2087 if (!(tc & ~charmask))
2088 goto display_glyph;
2089 } else if ( tc != -3 )
2090 continue; /* nothing to display */
2091 /* no hash table or no replacement --
2092 * hope for the best */
2093 if ( c & ~charmask )
2094 tc = '?';
2095 else
2096 tc = c;
2097 }
2098
2099 display_glyph:
2100 if (vc->vc_need_wrap || vc->vc_decim)
2101 FLUSH
2102 if (vc->vc_need_wrap) {
2103 cr(vc);
2104 lf(vc);
2105 }
2106 if (vc->vc_decim)
2107 insert_char(vc, 1);
2108 scr_writew(himask ?
2109 ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2110 (vc->vc_attr << 8) + tc,
2111 (u16 *) vc->vc_pos);
2112 if (DO_UPDATE(vc) && draw_x < 0) {
2113 draw_x = vc->vc_x;
2114 draw_from = vc->vc_pos;
2115 }
2116 if (vc->vc_x == vc->vc_cols - 1) {
2117 vc->vc_need_wrap = vc->vc_decawm;
2118 draw_to = vc->vc_pos + 2;
2119 } else {
2120 vc->vc_x++;
2121 draw_to = (vc->vc_pos += 2);
2122 }
2123 if (vc->vc_utf_count) {
2124 if (vc->vc_npar) {
2125 vc->vc_npar--;
2126 goto display_glyph;
2127 }
2128 vc->vc_utf_count = 0;
2129 c = orig;
2130 goto rescan_last_byte;
2131 }
2132 continue;
2133 }
2134 FLUSH
2135 do_con_trol(tty, vc, orig);
2136 }
2137 FLUSH
2138 console_conditional_schedule();
2139 release_console_sem();
2140
2141 out:
2142 return n;
2143 #undef FLUSH
2144 }
2145
2146 /*
2147 * This is the console switching callback.
2148 *
2149 * Doing console switching in a process context allows
2150 * us to do the switches asynchronously (needed when we want
2151 * to switch due to a keyboard interrupt). Synchronization
2152 * with other console code and prevention of re-entrancy is
2153 * ensured with console_sem.
2154 */
2155 static void console_callback(struct work_struct *ignored)
2156 {
2157 acquire_console_sem();
2158
2159 if (want_console >= 0) {
2160 if (want_console != fg_console &&
2161 vc_cons_allocated(want_console)) {
2162 hide_cursor(vc_cons[fg_console].d);
2163 change_console(vc_cons[want_console].d);
2164 /* we only changed when the console had already
2165 been allocated - a new console is not created
2166 in an interrupt routine */
2167 }
2168 want_console = -1;
2169 }
2170 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2171 do_poke_blanked_console = 0;
2172 poke_blanked_console();
2173 }
2174 if (scrollback_delta) {
2175 struct vc_data *vc = vc_cons[fg_console].d;
2176 clear_selection();
2177 if (vc->vc_mode == KD_TEXT)
2178 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2179 scrollback_delta = 0;
2180 }
2181 if (blank_timer_expired) {
2182 do_blank_screen(0);
2183 blank_timer_expired = 0;
2184 }
2185
2186 release_console_sem();
2187 }
2188
2189 int set_console(int nr)
2190 {
2191 struct vc_data *vc = vc_cons[fg_console].d;
2192
2193 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2194 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2195
2196 /*
2197 * Console switch will fail in console_callback() or
2198 * change_console() so there is no point scheduling
2199 * the callback
2200 *
2201 * Existing set_console() users don't check the return
2202 * value so this shouldn't break anything
2203 */
2204 return -EINVAL;
2205 }
2206
2207 want_console = nr;
2208 schedule_console_callback();
2209
2210 return 0;
2211 }
2212
2213 struct tty_driver *console_driver;
2214
2215 #ifdef CONFIG_VT_CONSOLE
2216
2217 /*
2218 * Console on virtual terminal
2219 *
2220 * The console must be locked when we get here.
2221 */
2222
2223 static void vt_console_print(struct console *co, const char *b, unsigned count)
2224 {
2225 struct vc_data *vc = vc_cons[fg_console].d;
2226 unsigned char c;
2227 static unsigned long printing;
2228 const ushort *start;
2229 ushort cnt = 0;
2230 ushort myx;
2231
2232 /* console busy or not yet initialized */
2233 if (!printable || test_and_set_bit(0, &printing))
2234 return;
2235
2236 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2237 vc = vc_cons[kmsg_redirect - 1].d;
2238
2239 /* read `x' only after setting currcons properly (otherwise
2240 the `x' macro will read the x of the foreground console). */
2241 myx = vc->vc_x;
2242
2243 if (!vc_cons_allocated(fg_console)) {
2244 /* impossible */
2245 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2246 goto quit;
2247 }
2248
2249 if (vc->vc_mode != KD_TEXT)
2250 goto quit;
2251
2252 /* undraw cursor first */
2253 if (IS_FG(vc))
2254 hide_cursor(vc);
2255
2256 start = (ushort *)vc->vc_pos;
2257
2258 /* Contrived structure to try to emulate original need_wrap behaviour
2259 * Problems caused when we have need_wrap set on '\n' character */
2260 while (count--) {
2261 c = *b++;
2262 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2263 if (cnt > 0) {
2264 if (CON_IS_VISIBLE(vc))
2265 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2266 vc->vc_x += cnt;
2267 if (vc->vc_need_wrap)
2268 vc->vc_x--;
2269 cnt = 0;
2270 }
2271 if (c == 8) { /* backspace */
2272 bs(vc);
2273 start = (ushort *)vc->vc_pos;
2274 myx = vc->vc_x;
2275 continue;
2276 }
2277 if (c != 13)
2278 lf(vc);
2279 cr(vc);
2280 start = (ushort *)vc->vc_pos;
2281 myx = vc->vc_x;
2282 if (c == 10 || c == 13)
2283 continue;
2284 }
2285 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2286 cnt++;
2287 if (myx == vc->vc_cols - 1) {
2288 vc->vc_need_wrap = 1;
2289 continue;
2290 }
2291 vc->vc_pos += 2;
2292 myx++;
2293 }
2294 if (cnt > 0) {
2295 if (CON_IS_VISIBLE(vc))
2296 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2297 vc->vc_x += cnt;
2298 if (vc->vc_x == vc->vc_cols) {
2299 vc->vc_x--;
2300 vc->vc_need_wrap = 1;
2301 }
2302 }
2303 set_cursor(vc);
2304
2305 quit:
2306 clear_bit(0, &printing);
2307 }
2308
2309 static struct tty_driver *vt_console_device(struct console *c, int *index)
2310 {
2311 *index = c->index ? c->index-1 : fg_console;
2312 return console_driver;
2313 }
2314
2315 static struct console vt_console_driver = {
2316 .name = "tty",
2317 .write = vt_console_print,
2318 .device = vt_console_device,
2319 .unblank = unblank_screen,
2320 .flags = CON_PRINTBUFFER,
2321 .index = -1,
2322 };
2323 #endif
2324
2325 /*
2326 * Handling of Linux-specific VC ioctls
2327 */
2328
2329 /*
2330 * Generally a bit racy with respect to console_sem().
2331 *
2332 * There are some functions which don't need it.
2333 *
2334 * There are some functions which can sleep for arbitrary periods
2335 * (paste_selection) but we don't need the lock there anyway.
2336 *
2337 * set_selection has locking, and definitely needs it
2338 */
2339
2340 int tioclinux(struct tty_struct *tty, unsigned long arg)
2341 {
2342 char type, data;
2343 char __user *p = (char __user *)arg;
2344 int lines;
2345 int ret;
2346
2347 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2348 return -EINVAL;
2349 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2350 return -EPERM;
2351 if (get_user(type, p))
2352 return -EFAULT;
2353 ret = 0;
2354 switch (type)
2355 {
2356 case TIOCL_SETSEL:
2357 acquire_console_sem();
2358 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2359 release_console_sem();
2360 break;
2361 case TIOCL_PASTESEL:
2362 ret = paste_selection(tty);
2363 break;
2364 case TIOCL_UNBLANKSCREEN:
2365 acquire_console_sem();
2366 unblank_screen();
2367 release_console_sem();
2368 break;
2369 case TIOCL_SELLOADLUT:
2370 ret = sel_loadlut(p);
2371 break;
2372 case TIOCL_GETSHIFTSTATE:
2373
2374 /*
2375 * Make it possible to react to Shift+Mousebutton.
2376 * Note that 'shift_state' is an undocumented
2377 * kernel-internal variable; programs not closely
2378 * related to the kernel should not use this.
2379 */
2380 data = shift_state;
2381 ret = __put_user(data, p);
2382 break;
2383 case TIOCL_GETMOUSEREPORTING:
2384 data = mouse_reporting();
2385 ret = __put_user(data, p);
2386 break;
2387 case TIOCL_SETVESABLANK:
2388 ret = set_vesa_blanking(p);
2389 break;
2390 case TIOCL_GETKMSGREDIRECT:
2391 data = kmsg_redirect;
2392 ret = __put_user(data, p);
2393 break;
2394 case TIOCL_SETKMSGREDIRECT:
2395 if (!capable(CAP_SYS_ADMIN)) {
2396 ret = -EPERM;
2397 } else {
2398 if (get_user(data, p+1))
2399 ret = -EFAULT;
2400 else
2401 kmsg_redirect = data;
2402 }
2403 break;
2404 case TIOCL_GETFGCONSOLE:
2405 ret = fg_console;
2406 break;
2407 case TIOCL_SCROLLCONSOLE:
2408 if (get_user(lines, (s32 __user *)(p+4))) {
2409 ret = -EFAULT;
2410 } else {
2411 scrollfront(vc_cons[fg_console].d, lines);
2412 ret = 0;
2413 }
2414 break;
2415 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2416 acquire_console_sem();
2417 ignore_poke = 1;
2418 do_blank_screen(0);
2419 release_console_sem();
2420 break;
2421 case TIOCL_BLANKEDSCREEN:
2422 ret = console_blanked;
2423 break;
2424 default:
2425 ret = -EINVAL;
2426 break;
2427 }
2428 return ret;
2429 }
2430
2431 /*
2432 * /dev/ttyN handling
2433 */
2434
2435 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2436 {
2437 int retval;
2438
2439 retval = do_con_write(tty, buf, count);
2440 con_flush_chars(tty);
2441
2442 return retval;
2443 }
2444
2445 static void con_put_char(struct tty_struct *tty, unsigned char ch)
2446 {
2447 if (in_interrupt())
2448 return; /* n_r3964 calls put_char() from interrupt context */
2449 do_con_write(tty, &ch, 1);
2450 }
2451
2452 static int con_write_room(struct tty_struct *tty)
2453 {
2454 if (tty->stopped)
2455 return 0;
2456 return 4096; /* No limit, really; we're not buffering */
2457 }
2458
2459 static int con_chars_in_buffer(struct tty_struct *tty)
2460 {
2461 return 0; /* we're not buffering */
2462 }
2463
2464 /*
2465 * con_throttle and con_unthrottle are only used for
2466 * paste_selection(), which has to stuff in a large number of
2467 * characters...
2468 */
2469 static void con_throttle(struct tty_struct *tty)
2470 {
2471 }
2472
2473 static void con_unthrottle(struct tty_struct *tty)
2474 {
2475 struct vc_data *vc = tty->driver_data;
2476
2477 wake_up_interruptible(&vc->paste_wait);
2478 }
2479
2480 /*
2481 * Turn the Scroll-Lock LED on when the tty is stopped
2482 */
2483 static void con_stop(struct tty_struct *tty)
2484 {
2485 int console_num;
2486 if (!tty)
2487 return;
2488 console_num = tty->index;
2489 if (!vc_cons_allocated(console_num))
2490 return;
2491 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2492 set_leds();
2493 }
2494
2495 /*
2496 * Turn the Scroll-Lock LED off when the console is started
2497 */
2498 static void con_start(struct tty_struct *tty)
2499 {
2500 int console_num;
2501 if (!tty)
2502 return;
2503 console_num = tty->index;
2504 if (!vc_cons_allocated(console_num))
2505 return;
2506 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2507 set_leds();
2508 }
2509
2510 static void con_flush_chars(struct tty_struct *tty)
2511 {
2512 struct vc_data *vc;
2513
2514 if (in_interrupt()) /* from flush_to_ldisc */
2515 return;
2516
2517 /* if we race with con_close(), vt may be null */
2518 acquire_console_sem();
2519 vc = tty->driver_data;
2520 if (vc)
2521 set_cursor(vc);
2522 release_console_sem();
2523 }
2524
2525 /*
2526 * Allocate the console screen memory.
2527 */
2528 static int con_open(struct tty_struct *tty, struct file *filp)
2529 {
2530 unsigned int currcons = tty->index;
2531 int ret = 0;
2532
2533 acquire_console_sem();
2534 if (tty->driver_data == NULL) {
2535 ret = vc_allocate(currcons);
2536 if (ret == 0) {
2537 struct vc_data *vc = vc_cons[currcons].d;
2538 tty->driver_data = vc;
2539 vc->vc_tty = tty;
2540
2541 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2542 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2543 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2544 }
2545 release_console_sem();
2546 vcs_make_sysfs(tty);
2547 return ret;
2548 }
2549 }
2550 release_console_sem();
2551 return ret;
2552 }
2553
2554 /*
2555 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2556 * and taking a ref against the tty while we're in the process of forgetting
2557 * about it and cleaning things up.
2558 *
2559 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2560 */
2561 static void con_close(struct tty_struct *tty, struct file *filp)
2562 {
2563 mutex_lock(&tty_mutex);
2564 acquire_console_sem();
2565 if (tty && tty->count == 1) {
2566 struct vc_data *vc = tty->driver_data;
2567
2568 if (vc)
2569 vc->vc_tty = NULL;
2570 tty->driver_data = NULL;
2571 release_console_sem();
2572 vcs_remove_sysfs(tty);
2573 mutex_unlock(&tty_mutex);
2574 /*
2575 * tty_mutex is released, but we still hold BKL, so there is
2576 * still exclusion against init_dev()
2577 */
2578 return;
2579 }
2580 release_console_sem();
2581 mutex_unlock(&tty_mutex);
2582 }
2583
2584 static void vc_init(struct vc_data *vc, unsigned int rows,
2585 unsigned int cols, int do_clear)
2586 {
2587 int j, k ;
2588
2589 vc->vc_cols = cols;
2590 vc->vc_rows = rows;
2591 vc->vc_size_row = cols << 1;
2592 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2593
2594 set_origin(vc);
2595 vc->vc_pos = vc->vc_origin;
2596 reset_vc(vc);
2597 for (j=k=0; j<16; j++) {
2598 vc->vc_palette[k++] = default_red[j] ;
2599 vc->vc_palette[k++] = default_grn[j] ;
2600 vc->vc_palette[k++] = default_blu[j] ;
2601 }
2602 vc->vc_def_color = 0x07; /* white */
2603 vc->vc_ulcolor = 0x0f; /* bold white */
2604 vc->vc_halfcolor = 0x08; /* grey */
2605 init_waitqueue_head(&vc->paste_wait);
2606 reset_terminal(vc, do_clear);
2607 }
2608
2609 /*
2610 * This routine initializes console interrupts, and does nothing
2611 * else. If you want the screen to clear, call tty_write with
2612 * the appropriate escape-sequence.
2613 */
2614
2615 static int __init con_init(void)
2616 {
2617 const char *display_desc = NULL;
2618 struct vc_data *vc;
2619 unsigned int currcons = 0, i;
2620
2621 acquire_console_sem();
2622
2623 if (conswitchp)
2624 display_desc = conswitchp->con_startup();
2625 if (!display_desc) {
2626 fg_console = 0;
2627 release_console_sem();
2628 return 0;
2629 }
2630
2631 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2632 struct con_driver *con_driver = &registered_con_driver[i];
2633
2634 if (con_driver->con == NULL) {
2635 con_driver->con = conswitchp;
2636 con_driver->desc = display_desc;
2637 con_driver->flag = CON_DRIVER_FLAG_INIT;
2638 con_driver->first = 0;
2639 con_driver->last = MAX_NR_CONSOLES - 1;
2640 break;
2641 }
2642 }
2643
2644 for (i = 0; i < MAX_NR_CONSOLES; i++)
2645 con_driver_map[i] = conswitchp;
2646
2647 if (blankinterval) {
2648 blank_state = blank_normal_wait;
2649 mod_timer(&console_timer, jiffies + blankinterval);
2650 }
2651
2652 /*
2653 * kmalloc is not running yet - we use the bootmem allocator.
2654 */
2655 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2656 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2657 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2658 visual_init(vc, currcons, 1);
2659 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2660 vc->vc_kmalloced = 0;
2661 vc_init(vc, vc->vc_rows, vc->vc_cols,
2662 currcons || !vc->vc_sw->con_save_screen);
2663 }
2664 currcons = fg_console = 0;
2665 master_display_fg = vc = vc_cons[currcons].d;
2666 set_origin(vc);
2667 save_screen(vc);
2668 gotoxy(vc, vc->vc_x, vc->vc_y);
2669 csi_J(vc, 0);
2670 update_screen(vc);
2671 printk("Console: %s %s %dx%d",
2672 vc->vc_can_do_color ? "colour" : "mono",
2673 display_desc, vc->vc_cols, vc->vc_rows);
2674 printable = 1;
2675 printk("\n");
2676
2677 release_console_sem();
2678
2679 #ifdef CONFIG_VT_CONSOLE
2680 register_console(&vt_console_driver);
2681 #endif
2682 return 0;
2683 }
2684 console_initcall(con_init);
2685
2686 static const struct tty_operations con_ops = {
2687 .open = con_open,
2688 .close = con_close,
2689 .write = con_write,
2690 .write_room = con_write_room,
2691 .put_char = con_put_char,
2692 .flush_chars = con_flush_chars,
2693 .chars_in_buffer = con_chars_in_buffer,
2694 .ioctl = vt_ioctl,
2695 .stop = con_stop,
2696 .start = con_start,
2697 .throttle = con_throttle,
2698 .unthrottle = con_unthrottle,
2699 };
2700
2701 int __init vty_init(void)
2702 {
2703 vcs_init();
2704
2705 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2706 if (!console_driver)
2707 panic("Couldn't allocate console driver\n");
2708 console_driver->owner = THIS_MODULE;
2709 console_driver->name = "tty";
2710 console_driver->name_base = 1;
2711 console_driver->major = TTY_MAJOR;
2712 console_driver->minor_start = 1;
2713 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2714 console_driver->init_termios = tty_std_termios;
2715 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2716 tty_set_operations(console_driver, &con_ops);
2717 if (tty_register_driver(console_driver))
2718 panic("Couldn't register console driver\n");
2719
2720 kbd_init();
2721 console_map_init();
2722 #ifdef CONFIG_PROM_CONSOLE
2723 prom_con_init();
2724 #endif
2725 #ifdef CONFIG_MDA_CONSOLE
2726 mda_console_init();
2727 #endif
2728 return 0;
2729 }
2730
2731 #ifndef VT_SINGLE_DRIVER
2732 #include <linux/device.h>
2733
2734 static struct class *vtconsole_class;
2735
2736 static int bind_con_driver(const struct consw *csw, int first, int last,
2737 int deflt)
2738 {
2739 struct module *owner = csw->owner;
2740 const char *desc = NULL;
2741 struct con_driver *con_driver;
2742 int i, j = -1, k = -1, retval = -ENODEV;
2743
2744 if (!try_module_get(owner))
2745 return -ENODEV;
2746
2747 acquire_console_sem();
2748
2749 /* check if driver is registered */
2750 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2751 con_driver = &registered_con_driver[i];
2752
2753 if (con_driver->con == csw) {
2754 desc = con_driver->desc;
2755 retval = 0;
2756 break;
2757 }
2758 }
2759
2760 if (retval)
2761 goto err;
2762
2763 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2764 csw->con_startup();
2765 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2766 }
2767
2768 if (deflt) {
2769 if (conswitchp)
2770 module_put(conswitchp->owner);
2771
2772 __module_get(owner);
2773 conswitchp = csw;
2774 }
2775
2776 first = max(first, con_driver->first);
2777 last = min(last, con_driver->last);
2778
2779 for (i = first; i <= last; i++) {
2780 int old_was_color;
2781 struct vc_data *vc = vc_cons[i].d;
2782
2783 if (con_driver_map[i])
2784 module_put(con_driver_map[i]->owner);
2785 __module_get(owner);
2786 con_driver_map[i] = csw;
2787
2788 if (!vc || !vc->vc_sw)
2789 continue;
2790
2791 j = i;
2792
2793 if (CON_IS_VISIBLE(vc)) {
2794 k = i;
2795 save_screen(vc);
2796 }
2797
2798 old_was_color = vc->vc_can_do_color;
2799 vc->vc_sw->con_deinit(vc);
2800 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2801 visual_init(vc, i, 0);
2802 set_origin(vc);
2803 update_attr(vc);
2804
2805 /* If the console changed between mono <-> color, then
2806 * the attributes in the screenbuf will be wrong. The
2807 * following resets all attributes to something sane.
2808 */
2809 if (old_was_color != vc->vc_can_do_color)
2810 clear_buffer_attributes(vc);
2811 }
2812
2813 printk("Console: switching ");
2814 if (!deflt)
2815 printk("consoles %d-%d ", first+1, last+1);
2816 if (j >= 0) {
2817 struct vc_data *vc = vc_cons[j].d;
2818
2819 printk("to %s %s %dx%d\n",
2820 vc->vc_can_do_color ? "colour" : "mono",
2821 desc, vc->vc_cols, vc->vc_rows);
2822
2823 if (k >= 0) {
2824 vc = vc_cons[k].d;
2825 update_screen(vc);
2826 }
2827 } else
2828 printk("to %s\n", desc);
2829
2830 retval = 0;
2831 err:
2832 release_console_sem();
2833 module_put(owner);
2834 return retval;
2835 };
2836
2837 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
2838 static int con_is_graphics(const struct consw *csw, int first, int last)
2839 {
2840 int i, retval = 0;
2841
2842 for (i = first; i <= last; i++) {
2843 struct vc_data *vc = vc_cons[i].d;
2844
2845 if (vc && vc->vc_mode == KD_GRAPHICS) {
2846 retval = 1;
2847 break;
2848 }
2849 }
2850
2851 return retval;
2852 }
2853
2854 static int unbind_con_driver(const struct consw *csw, int first, int last,
2855 int deflt)
2856 {
2857 struct module *owner = csw->owner;
2858 const struct consw *defcsw = NULL;
2859 struct con_driver *con_driver = NULL, *con_back = NULL;
2860 int i, retval = -ENODEV;
2861
2862 if (!try_module_get(owner))
2863 return -ENODEV;
2864
2865 acquire_console_sem();
2866
2867 /* check if driver is registered and if it is unbindable */
2868 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2869 con_driver = &registered_con_driver[i];
2870
2871 if (con_driver->con == csw &&
2872 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
2873 retval = 0;
2874 break;
2875 }
2876 }
2877
2878 if (retval) {
2879 release_console_sem();
2880 goto err;
2881 }
2882
2883 retval = -ENODEV;
2884
2885 /* check if backup driver exists */
2886 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2887 con_back = &registered_con_driver[i];
2888
2889 if (con_back->con &&
2890 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
2891 defcsw = con_back->con;
2892 retval = 0;
2893 break;
2894 }
2895 }
2896
2897 if (retval) {
2898 release_console_sem();
2899 goto err;
2900 }
2901
2902 if (!con_is_bound(csw)) {
2903 release_console_sem();
2904 goto err;
2905 }
2906
2907 first = max(first, con_driver->first);
2908 last = min(last, con_driver->last);
2909
2910 for (i = first; i <= last; i++) {
2911 if (con_driver_map[i] == csw) {
2912 module_put(csw->owner);
2913 con_driver_map[i] = NULL;
2914 }
2915 }
2916
2917 if (!con_is_bound(defcsw)) {
2918 const struct consw *defconsw = conswitchp;
2919
2920 defcsw->con_startup();
2921 con_back->flag |= CON_DRIVER_FLAG_INIT;
2922 /*
2923 * vgacon may change the default driver to point
2924 * to dummycon, we restore it here...
2925 */
2926 conswitchp = defconsw;
2927 }
2928
2929 if (!con_is_bound(csw))
2930 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2931
2932 release_console_sem();
2933 /* ignore return value, binding should not fail */
2934 bind_con_driver(defcsw, first, last, deflt);
2935 err:
2936 module_put(owner);
2937 return retval;
2938
2939 }
2940
2941 static int vt_bind(struct con_driver *con)
2942 {
2943 const struct consw *defcsw = NULL, *csw = NULL;
2944 int i, more = 1, first = -1, last = -1, deflt = 0;
2945
2946 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2947 con_is_graphics(con->con, con->first, con->last))
2948 goto err;
2949
2950 csw = con->con;
2951
2952 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2953 struct con_driver *con = &registered_con_driver[i];
2954
2955 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2956 defcsw = con->con;
2957 break;
2958 }
2959 }
2960
2961 if (!defcsw)
2962 goto err;
2963
2964 while (more) {
2965 more = 0;
2966
2967 for (i = con->first; i <= con->last; i++) {
2968 if (con_driver_map[i] == defcsw) {
2969 if (first == -1)
2970 first = i;
2971 last = i;
2972 more = 1;
2973 } else if (first != -1)
2974 break;
2975 }
2976
2977 if (first == 0 && last == MAX_NR_CONSOLES -1)
2978 deflt = 1;
2979
2980 if (first != -1)
2981 bind_con_driver(csw, first, last, deflt);
2982
2983 first = -1;
2984 last = -1;
2985 deflt = 0;
2986 }
2987
2988 err:
2989 return 0;
2990 }
2991
2992 static int vt_unbind(struct con_driver *con)
2993 {
2994 const struct consw *csw = NULL;
2995 int i, more = 1, first = -1, last = -1, deflt = 0;
2996
2997 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2998 con_is_graphics(con->con, con->first, con->last))
2999 goto err;
3000
3001 csw = con->con;
3002
3003 while (more) {
3004 more = 0;
3005
3006 for (i = con->first; i <= con->last; i++) {
3007 if (con_driver_map[i] == csw) {
3008 if (first == -1)
3009 first = i;
3010 last = i;
3011 more = 1;
3012 } else if (first != -1)
3013 break;
3014 }
3015
3016 if (first == 0 && last == MAX_NR_CONSOLES -1)
3017 deflt = 1;
3018
3019 if (first != -1)
3020 unbind_con_driver(csw, first, last, deflt);
3021
3022 first = -1;
3023 last = -1;
3024 deflt = 0;
3025 }
3026
3027 err:
3028 return 0;
3029 }
3030 #else
3031 static inline int vt_bind(struct con_driver *con)
3032 {
3033 return 0;
3034 }
3035 static inline int vt_unbind(struct con_driver *con)
3036 {
3037 return 0;
3038 }
3039 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3040
3041 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3042 const char *buf, size_t count)
3043 {
3044 struct con_driver *con = dev_get_drvdata(dev);
3045 int bind = simple_strtoul(buf, NULL, 0);
3046
3047 if (bind)
3048 vt_bind(con);
3049 else
3050 vt_unbind(con);
3051
3052 return count;
3053 }
3054
3055 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3056 char *buf)
3057 {
3058 struct con_driver *con = dev_get_drvdata(dev);
3059 int bind = con_is_bound(con->con);
3060
3061 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3062 }
3063
3064 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3065 char *buf)
3066 {
3067 struct con_driver *con = dev_get_drvdata(dev);
3068
3069 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3070 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3071 con->desc);
3072
3073 }
3074
3075 static struct device_attribute device_attrs[] = {
3076 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3077 __ATTR(name, S_IRUGO, show_name, NULL),
3078 };
3079
3080 static int vtconsole_init_device(struct con_driver *con)
3081 {
3082 int i;
3083 int error = 0;
3084
3085 con->flag |= CON_DRIVER_FLAG_ATTR;
3086 dev_set_drvdata(con->dev, con);
3087 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3088 error = device_create_file(con->dev, &device_attrs[i]);
3089 if (error)
3090 break;
3091 }
3092
3093 if (error) {
3094 while (--i >= 0)
3095 device_remove_file(con->dev, &device_attrs[i]);
3096 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3097 }
3098
3099 return error;
3100 }
3101
3102 static void vtconsole_deinit_device(struct con_driver *con)
3103 {
3104 int i;
3105
3106 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3107 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3108 device_remove_file(con->dev, &device_attrs[i]);
3109 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3110 }
3111 }
3112
3113 /**
3114 * con_is_bound - checks if driver is bound to the console
3115 * @csw: console driver
3116 *
3117 * RETURNS: zero if unbound, nonzero if bound
3118 *
3119 * Drivers can call this and if zero, they should release
3120 * all resources allocated on con_startup()
3121 */
3122 int con_is_bound(const struct consw *csw)
3123 {
3124 int i, bound = 0;
3125
3126 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3127 if (con_driver_map[i] == csw) {
3128 bound = 1;
3129 break;
3130 }
3131 }
3132
3133 return bound;
3134 }
3135 EXPORT_SYMBOL(con_is_bound);
3136
3137 /**
3138 * register_con_driver - register console driver to console layer
3139 * @csw: console driver
3140 * @first: the first console to take over, minimum value is 0
3141 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3142 *
3143 * DESCRIPTION: This function registers a console driver which can later
3144 * bind to a range of consoles specified by @first and @last. It will
3145 * also initialize the console driver by calling con_startup().
3146 */
3147 int register_con_driver(const struct consw *csw, int first, int last)
3148 {
3149 struct module *owner = csw->owner;
3150 struct con_driver *con_driver;
3151 const char *desc;
3152 int i, retval = 0;
3153
3154 if (!try_module_get(owner))
3155 return -ENODEV;
3156
3157 acquire_console_sem();
3158
3159 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3160 con_driver = &registered_con_driver[i];
3161
3162 /* already registered */
3163 if (con_driver->con == csw)
3164 retval = -EINVAL;
3165 }
3166
3167 if (retval)
3168 goto err;
3169
3170 desc = csw->con_startup();
3171
3172 if (!desc)
3173 goto err;
3174
3175 retval = -EINVAL;
3176
3177 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3178 con_driver = &registered_con_driver[i];
3179
3180 if (con_driver->con == NULL) {
3181 con_driver->con = csw;
3182 con_driver->desc = desc;
3183 con_driver->node = i;
3184 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3185 CON_DRIVER_FLAG_INIT;
3186 con_driver->first = first;
3187 con_driver->last = last;
3188 retval = 0;
3189 break;
3190 }
3191 }
3192
3193 if (retval)
3194 goto err;
3195
3196 con_driver->dev = device_create(vtconsole_class, NULL,
3197 MKDEV(0, con_driver->node),
3198 "vtcon%i", con_driver->node);
3199
3200 if (IS_ERR(con_driver->dev)) {
3201 printk(KERN_WARNING "Unable to create device for %s; "
3202 "errno = %ld\n", con_driver->desc,
3203 PTR_ERR(con_driver->dev));
3204 con_driver->dev = NULL;
3205 } else {
3206 vtconsole_init_device(con_driver);
3207 }
3208
3209 err:
3210 release_console_sem();
3211 module_put(owner);
3212 return retval;
3213 }
3214 EXPORT_SYMBOL(register_con_driver);
3215
3216 /**
3217 * unregister_con_driver - unregister console driver from console layer
3218 * @csw: console driver
3219 *
3220 * DESCRIPTION: All drivers that registers to the console layer must
3221 * call this function upon exit, or if the console driver is in a state
3222 * where it won't be able to handle console services, such as the
3223 * framebuffer console without loaded framebuffer drivers.
3224 *
3225 * The driver must unbind first prior to unregistration.
3226 */
3227 int unregister_con_driver(const struct consw *csw)
3228 {
3229 int i, retval = -ENODEV;
3230
3231 acquire_console_sem();
3232
3233 /* cannot unregister a bound driver */
3234 if (con_is_bound(csw))
3235 goto err;
3236
3237 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3238 struct con_driver *con_driver = &registered_con_driver[i];
3239
3240 if (con_driver->con == csw &&
3241 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3242 vtconsole_deinit_device(con_driver);
3243 device_destroy(vtconsole_class,
3244 MKDEV(0, con_driver->node));
3245 con_driver->con = NULL;
3246 con_driver->desc = NULL;
3247 con_driver->dev = NULL;
3248 con_driver->node = 0;
3249 con_driver->flag = 0;
3250 con_driver->first = 0;
3251 con_driver->last = 0;
3252 retval = 0;
3253 break;
3254 }
3255 }
3256 err:
3257 release_console_sem();
3258 return retval;
3259 }
3260 EXPORT_SYMBOL(unregister_con_driver);
3261
3262 /*
3263 * If we support more console drivers, this function is used
3264 * when a driver wants to take over some existing consoles
3265 * and become default driver for newly opened ones.
3266 *
3267 * take_over_console is basically a register followed by unbind
3268 */
3269 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3270 {
3271 int err;
3272
3273 err = register_con_driver(csw, first, last);
3274
3275 if (!err)
3276 bind_con_driver(csw, first, last, deflt);
3277
3278 return err;
3279 }
3280
3281 /*
3282 * give_up_console is a wrapper to unregister_con_driver. It will only
3283 * work if driver is fully unbound.
3284 */
3285 void give_up_console(const struct consw *csw)
3286 {
3287 unregister_con_driver(csw);
3288 }
3289
3290 static int __init vtconsole_class_init(void)
3291 {
3292 int i;
3293
3294 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3295 if (IS_ERR(vtconsole_class)) {
3296 printk(KERN_WARNING "Unable to create vt console class; "
3297 "errno = %ld\n", PTR_ERR(vtconsole_class));
3298 vtconsole_class = NULL;
3299 }
3300
3301 /* Add system drivers to sysfs */
3302 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3303 struct con_driver *con = &registered_con_driver[i];
3304
3305 if (con->con && !con->dev) {
3306 con->dev = device_create(vtconsole_class, NULL,
3307 MKDEV(0, con->node),
3308 "vtcon%i", con->node);
3309
3310 if (IS_ERR(con->dev)) {
3311 printk(KERN_WARNING "Unable to create "
3312 "device for %s; errno = %ld\n",
3313 con->desc, PTR_ERR(con->dev));
3314 con->dev = NULL;
3315 } else {
3316 vtconsole_init_device(con);
3317 }
3318 }
3319 }
3320
3321 return 0;
3322 }
3323 postcore_initcall(vtconsole_class_init);
3324
3325 #endif
3326
3327 /*
3328 * Screen blanking
3329 */
3330
3331 static int set_vesa_blanking(char __user *p)
3332 {
3333 unsigned int mode;
3334
3335 if (get_user(mode, p + 1))
3336 return -EFAULT;
3337
3338 vesa_blank_mode = (mode < 4) ? mode : 0;
3339 return 0;
3340 }
3341
3342 void do_blank_screen(int entering_gfx)
3343 {
3344 struct vc_data *vc = vc_cons[fg_console].d;
3345 int i;
3346
3347 WARN_CONSOLE_UNLOCKED();
3348
3349 if (console_blanked) {
3350 if (blank_state == blank_vesa_wait) {
3351 blank_state = blank_off;
3352 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3353 }
3354 return;
3355 }
3356 if (blank_state != blank_normal_wait)
3357 return;
3358 blank_state = blank_off;
3359
3360 /* entering graphics mode? */
3361 if (entering_gfx) {
3362 hide_cursor(vc);
3363 save_screen(vc);
3364 vc->vc_sw->con_blank(vc, -1, 1);
3365 console_blanked = fg_console + 1;
3366 set_origin(vc);
3367 return;
3368 }
3369
3370 /* don't blank graphics */
3371 if (vc->vc_mode != KD_TEXT) {
3372 console_blanked = fg_console + 1;
3373 return;
3374 }
3375
3376 hide_cursor(vc);
3377 del_timer_sync(&console_timer);
3378 blank_timer_expired = 0;
3379
3380 save_screen(vc);
3381 /* In case we need to reset origin, blanking hook returns 1 */
3382 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3383 console_blanked = fg_console + 1;
3384 if (i)
3385 set_origin(vc);
3386
3387 if (console_blank_hook && console_blank_hook(1))
3388 return;
3389
3390 if (vesa_off_interval && vesa_blank_mode) {
3391 blank_state = blank_vesa_wait;
3392 mod_timer(&console_timer, jiffies + vesa_off_interval);
3393 }
3394 }
3395 EXPORT_SYMBOL(do_blank_screen);
3396
3397 /*
3398 * Called by timer as well as from vt_console_driver
3399 */
3400 void do_unblank_screen(int leaving_gfx)
3401 {
3402 struct vc_data *vc;
3403
3404 /* This should now always be called from a "sane" (read: can schedule)
3405 * context for the sake of the low level drivers, except in the special
3406 * case of oops_in_progress
3407 */
3408 if (!oops_in_progress)
3409 might_sleep();
3410
3411 WARN_CONSOLE_UNLOCKED();
3412
3413 ignore_poke = 0;
3414 if (!console_blanked)
3415 return;
3416 if (!vc_cons_allocated(fg_console)) {
3417 /* impossible */
3418 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3419 return;
3420 }
3421 vc = vc_cons[fg_console].d;
3422 if (vc->vc_mode != KD_TEXT)
3423 return; /* but leave console_blanked != 0 */
3424
3425 if (blankinterval) {
3426 mod_timer(&console_timer, jiffies + blankinterval);
3427 blank_state = blank_normal_wait;
3428 }
3429
3430 console_blanked = 0;
3431 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3432 /* Low-level driver cannot restore -> do it ourselves */
3433 update_screen(vc);
3434 if (console_blank_hook)
3435 console_blank_hook(0);
3436 set_palette(vc);
3437 set_cursor(vc);
3438 }
3439 EXPORT_SYMBOL(do_unblank_screen);
3440
3441 /*
3442 * This is called by the outside world to cause a forced unblank, mostly for
3443 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3444 * call it with 1 as an argument and so force a mode restore... that may kill
3445 * X or at least garbage the screen but would also make the Oops visible...
3446 */
3447 void unblank_screen(void)
3448 {
3449 do_unblank_screen(0);
3450 }
3451
3452 /*
3453 * We defer the timer blanking to work queue so it can take the console mutex
3454 * (console operations can still happen at irq time, but only from printk which
3455 * has the console mutex. Not perfect yet, but better than no locking
3456 */
3457 static void blank_screen_t(unsigned long dummy)
3458 {
3459 if (unlikely(!keventd_up())) {
3460 mod_timer(&console_timer, jiffies + blankinterval);
3461 return;
3462 }
3463 blank_timer_expired = 1;
3464 schedule_work(&console_work);
3465 }
3466
3467 void poke_blanked_console(void)
3468 {
3469 WARN_CONSOLE_UNLOCKED();
3470
3471 /* Add this so we quickly catch whoever might call us in a non
3472 * safe context. Nowadays, unblank_screen() isn't to be called in
3473 * atomic contexts and is allowed to schedule (with the special case
3474 * of oops_in_progress, but that isn't of any concern for this
3475 * function. --BenH.
3476 */
3477 might_sleep();
3478
3479 /* This isn't perfectly race free, but a race here would be mostly harmless,
3480 * at worse, we'll do a spurrious blank and it's unlikely
3481 */
3482 del_timer(&console_timer);
3483 blank_timer_expired = 0;
3484
3485 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3486 return;
3487 if (console_blanked)
3488 unblank_screen();
3489 else if (blankinterval) {
3490 mod_timer(&console_timer, jiffies + blankinterval);
3491 blank_state = blank_normal_wait;
3492 }
3493 }
3494
3495 /*
3496 * Palettes
3497 */
3498
3499 static void set_palette(struct vc_data *vc)
3500 {
3501 WARN_CONSOLE_UNLOCKED();
3502
3503 if (vc->vc_mode != KD_GRAPHICS)
3504 vc->vc_sw->con_set_palette(vc, color_table);
3505 }
3506
3507 static int set_get_cmap(unsigned char __user *arg, int set)
3508 {
3509 int i, j, k;
3510
3511 WARN_CONSOLE_UNLOCKED();
3512
3513 for (i = 0; i < 16; i++)
3514 if (set) {
3515 get_user(default_red[i], arg++);
3516 get_user(default_grn[i], arg++);
3517 get_user(default_blu[i], arg++);
3518 } else {
3519 put_user(default_red[i], arg++);
3520 put_user(default_grn[i], arg++);
3521 put_user(default_blu[i], arg++);
3522 }
3523 if (set) {
3524 for (i = 0; i < MAX_NR_CONSOLES; i++)
3525 if (vc_cons_allocated(i)) {
3526 for (j = k = 0; j < 16; j++) {
3527 vc_cons[i].d->vc_palette[k++] = default_red[j];
3528 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3529 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3530 }
3531 set_palette(vc_cons[i].d);
3532 }
3533 }
3534 return 0;
3535 }
3536
3537 /*
3538 * Load palette into the DAC registers. arg points to a colour
3539 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3540 */
3541
3542 int con_set_cmap(unsigned char __user *arg)
3543 {
3544 int rc;
3545
3546 acquire_console_sem();
3547 rc = set_get_cmap (arg,1);
3548 release_console_sem();
3549
3550 return rc;
3551 }
3552
3553 int con_get_cmap(unsigned char __user *arg)
3554 {
3555 int rc;
3556
3557 acquire_console_sem();
3558 rc = set_get_cmap (arg,0);
3559 release_console_sem();
3560
3561 return rc;
3562 }
3563
3564 void reset_palette(struct vc_data *vc)
3565 {
3566 int j, k;
3567 for (j=k=0; j<16; j++) {
3568 vc->vc_palette[k++] = default_red[j];
3569 vc->vc_palette[k++] = default_grn[j];
3570 vc->vc_palette[k++] = default_blu[j];
3571 }
3572 set_palette(vc);
3573 }
3574
3575 /*
3576 * Font switching
3577 *
3578 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3579 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3580 * depending on width) reserved for each character which is kinda wasty, but
3581 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3582 * is upto the actual low-level console-driver convert data into its favorite
3583 * format (maybe we should add a `fontoffset' field to the `display'
3584 * structure so we won't have to convert the fontdata all the time.
3585 * /Jes
3586 */
3587
3588 #define max_font_size 65536
3589
3590 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3591 {
3592 struct console_font font;
3593 int rc = -EINVAL;
3594 int c;
3595
3596 if (vc->vc_mode != KD_TEXT)
3597 return -EINVAL;
3598
3599 if (op->data) {
3600 font.data = kmalloc(max_font_size, GFP_KERNEL);
3601 if (!font.data)
3602 return -ENOMEM;
3603 } else
3604 font.data = NULL;
3605
3606 acquire_console_sem();
3607 if (vc->vc_sw->con_font_get)
3608 rc = vc->vc_sw->con_font_get(vc, &font);
3609 else
3610 rc = -ENOSYS;
3611 release_console_sem();
3612
3613 if (rc)
3614 goto out;
3615
3616 c = (font.width+7)/8 * 32 * font.charcount;
3617
3618 if (op->data && font.charcount > op->charcount)
3619 rc = -ENOSPC;
3620 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3621 if (font.width > op->width || font.height > op->height)
3622 rc = -ENOSPC;
3623 } else {
3624 if (font.width != 8)
3625 rc = -EIO;
3626 else if ((op->height && font.height > op->height) ||
3627 font.height > 32)
3628 rc = -ENOSPC;
3629 }
3630 if (rc)
3631 goto out;
3632
3633 op->height = font.height;
3634 op->width = font.width;
3635 op->charcount = font.charcount;
3636
3637 if (op->data && copy_to_user(op->data, font.data, c))
3638 rc = -EFAULT;
3639
3640 out:
3641 kfree(font.data);
3642 return rc;
3643 }
3644
3645 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3646 {
3647 struct console_font font;
3648 int rc = -EINVAL;
3649 int size;
3650
3651 if (vc->vc_mode != KD_TEXT)
3652 return -EINVAL;
3653 if (!op->data)
3654 return -EINVAL;
3655 if (op->charcount > 512)
3656 return -EINVAL;
3657 if (!op->height) { /* Need to guess font height [compat] */
3658 int h, i;
3659 u8 __user *charmap = op->data;
3660 u8 tmp;
3661
3662 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3663 so that we can get rid of this soon */
3664 if (!(op->flags & KD_FONT_FLAG_OLD))
3665 return -EINVAL;
3666 for (h = 32; h > 0; h--)
3667 for (i = 0; i < op->charcount; i++) {
3668 if (get_user(tmp, &charmap[32*i+h-1]))
3669 return -EFAULT;
3670 if (tmp)
3671 goto nonzero;
3672 }
3673 return -EINVAL;
3674 nonzero:
3675 op->height = h;
3676 }
3677 if (op->width <= 0 || op->width > 32 || op->height > 32)
3678 return -EINVAL;
3679 size = (op->width+7)/8 * 32 * op->charcount;
3680 if (size > max_font_size)
3681 return -ENOSPC;
3682 font.charcount = op->charcount;
3683 font.height = op->height;
3684 font.width = op->width;
3685 font.data = kmalloc(size, GFP_KERNEL);
3686 if (!font.data)
3687 return -ENOMEM;
3688 if (copy_from_user(font.data, op->data, size)) {
3689 kfree(font.data);
3690 return -EFAULT;
3691 }
3692 acquire_console_sem();
3693 if (vc->vc_sw->con_font_set)
3694 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3695 else
3696 rc = -ENOSYS;
3697 release_console_sem();
3698 kfree(font.data);
3699 return rc;
3700 }
3701
3702 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3703 {
3704 struct console_font font = {.width = op->width, .height = op->height};
3705 char name[MAX_FONT_NAME];
3706 char *s = name;
3707 int rc;
3708
3709 if (vc->vc_mode != KD_TEXT)
3710 return -EINVAL;
3711
3712 if (!op->data)
3713 s = NULL;
3714 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3715 return -EFAULT;
3716 else
3717 name[MAX_FONT_NAME - 1] = 0;
3718
3719 acquire_console_sem();
3720 if (vc->vc_sw->con_font_default)
3721 rc = vc->vc_sw->con_font_default(vc, &font, s);
3722 else
3723 rc = -ENOSYS;
3724 release_console_sem();
3725 if (!rc) {
3726 op->width = font.width;
3727 op->height = font.height;
3728 }
3729 return rc;
3730 }
3731
3732 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3733 {
3734 int con = op->height;
3735 int rc;
3736
3737 if (vc->vc_mode != KD_TEXT)
3738 return -EINVAL;
3739
3740 acquire_console_sem();
3741 if (!vc->vc_sw->con_font_copy)
3742 rc = -ENOSYS;
3743 else if (con < 0 || !vc_cons_allocated(con))
3744 rc = -ENOTTY;
3745 else if (con == vc->vc_num) /* nothing to do */
3746 rc = 0;
3747 else
3748 rc = vc->vc_sw->con_font_copy(vc, con);
3749 release_console_sem();
3750 return rc;
3751 }
3752
3753 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3754 {
3755 switch (op->op) {
3756 case KD_FONT_OP_SET:
3757 return con_font_set(vc, op);
3758 case KD_FONT_OP_GET:
3759 return con_font_get(vc, op);
3760 case KD_FONT_OP_SET_DEFAULT:
3761 return con_font_default(vc, op);
3762 case KD_FONT_OP_COPY:
3763 return con_font_copy(vc, op);
3764 }
3765 return -ENOSYS;
3766 }
3767
3768 /*
3769 * Interface exported to selection and vcs.
3770 */
3771
3772 /* used by selection */
3773 u16 screen_glyph(struct vc_data *vc, int offset)
3774 {
3775 u16 w = scr_readw(screenpos(vc, offset, 1));
3776 u16 c = w & 0xff;
3777
3778 if (w & vc->vc_hi_font_mask)
3779 c |= 0x100;
3780 return c;
3781 }
3782
3783 /* used by vcs - note the word offset */
3784 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3785 {
3786 return screenpos(vc, 2 * w_offset, viewed);
3787 }
3788
3789 void getconsxy(struct vc_data *vc, unsigned char *p)
3790 {
3791 p[0] = vc->vc_x;
3792 p[1] = vc->vc_y;
3793 }
3794
3795 void putconsxy(struct vc_data *vc, unsigned char *p)
3796 {
3797 hide_cursor(vc);
3798 gotoxy(vc, p[0], p[1]);
3799 set_cursor(vc);
3800 }
3801
3802 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3803 {
3804 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3805 return softcursor_original;
3806 return scr_readw(org);
3807 }
3808
3809 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3810 {
3811 scr_writew(val, org);
3812 if ((unsigned long)org == vc->vc_pos) {
3813 softcursor_original = -1;
3814 add_softcursor(vc);
3815 }
3816 }
3817
3818 /*
3819 * Visible symbols for modules
3820 */
3821
3822 EXPORT_SYMBOL(color_table);
3823 EXPORT_SYMBOL(default_red);
3824 EXPORT_SYMBOL(default_grn);
3825 EXPORT_SYMBOL(default_blu);
3826 EXPORT_SYMBOL(update_region);
3827 EXPORT_SYMBOL(redraw_screen);
3828 EXPORT_SYMBOL(vc_resize);
3829 EXPORT_SYMBOL(vc_lock_resize);
3830 EXPORT_SYMBOL(fg_console);
3831 EXPORT_SYMBOL(console_blank_hook);
3832 EXPORT_SYMBOL(console_blanked);
3833 EXPORT_SYMBOL(vc_cons);
3834 #ifndef VT_SINGLE_DRIVER
3835 EXPORT_SYMBOL(take_over_console);
3836 EXPORT_SYMBOL(give_up_console);
3837 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree