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