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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6/linux-mips/linux-dm7025.git] / drivers / char / vt.c
blobe458b08139afb6fd638b125334ca1b602eb8e136
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/bootmem.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103
104 #include <asm/io.h>
105 #include <asm/system.h>
106 #include <asm/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164
165 /*
166 * ignore_poke: don't unblank the screen when things are typed. This is
167 * mainly for the privacy of braille terminal users.
168 */
169 static int ignore_poke;
170
171 int do_poke_blanked_console;
172 int console_blanked;
173
174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
175 static int blankinterval = 10*60*HZ;
176 static int vesa_off_interval;
177
178 static DECLARE_WORK(console_work, console_callback);
179
180 /*
181 * fg_console is the current virtual console,
182 * last_console is the last used one,
183 * want_console is the console we want to switch to,
184 * kmsg_redirect is the console for kernel messages,
185 */
186 int fg_console;
187 int last_console;
188 int want_console = -1;
189 int kmsg_redirect;
190
191 /*
192 * For each existing display, we have a pointer to console currently visible
193 * on that display, allowing consoles other than fg_console to be refreshed
194 * appropriately. Unless the low-level driver supplies its own display_fg
195 * variable, we use this one for the "master display".
196 */
197 static struct vc_data *master_display_fg;
198
199 /*
200 * Unfortunately, we need to delay tty echo when we're currently writing to the
201 * console since the code is (and always was) not re-entrant, so we schedule
202 * all flip requests to process context with schedule-task() and run it from
203 * console_callback().
204 */
205
206 /*
207 * For the same reason, we defer scrollback to the console callback.
208 */
209 static int scrollback_delta;
210
211 /*
212 * Hook so that the power management routines can (un)blank
213 * the console on our behalf.
214 */
215 int (*console_blank_hook)(int);
216
217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
218 static int blank_state;
219 static int blank_timer_expired;
220 enum {
221 blank_off = 0,
222 blank_normal_wait,
223 blank_vesa_wait,
224 };
225
226 /*
227 * Notifier list for console events.
228 */
229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
230
231 int register_vt_notifier(struct notifier_block *nb)
232 {
233 return atomic_notifier_chain_register(&vt_notifier_list, nb);
234 }
235 EXPORT_SYMBOL_GPL(register_vt_notifier);
236
237 int unregister_vt_notifier(struct notifier_block *nb)
238 {
239 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
240 }
241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
242
243 static void notify_write(struct vc_data *vc, unsigned int unicode)
244 {
245 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
246 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
247 }
248
249 static void notify_update(struct vc_data *vc)
250 {
251 struct vt_notifier_param param = { .vc = vc };
252 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
253 }
254
255 /*
256 * Low-Level Functions
257 */
258
259 #define IS_FG(vc) ((vc)->vc_num == fg_console)
260
261 #ifdef VT_BUF_VRAM_ONLY
262 #define DO_UPDATE(vc) 0
263 #else
264 #define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
265 #endif
266
267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
268 {
269 unsigned short *p;
270
271 if (!viewed)
272 p = (unsigned short *)(vc->vc_origin + offset);
273 else if (!vc->vc_sw->con_screen_pos)
274 p = (unsigned short *)(vc->vc_visible_origin + offset);
275 else
276 p = vc->vc_sw->con_screen_pos(vc, offset);
277 return p;
278 }
279
280 static inline void scrolldelta(int lines)
281 {
282 scrollback_delta += lines;
283 schedule_console_callback();
284 }
285
286 void schedule_console_callback(void)
287 {
288 schedule_work(&console_work);
289 }
290
291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
292 {
293 unsigned short *d, *s;
294
295 if (t+nr >= b)
296 nr = b - t - 1;
297 if (b > vc->vc_rows || t >= b || nr < 1)
298 return;
299 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
300 return;
301 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
302 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
303 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
304 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_scrl_erase_char,
305 vc->vc_size_row * nr);
306 }
307
308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
309 {
310 unsigned short *s;
311 unsigned int step;
312
313 if (t+nr >= b)
314 nr = b - t - 1;
315 if (b > vc->vc_rows || t >= b || nr < 1)
316 return;
317 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
318 return;
319 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
320 step = vc->vc_cols * nr;
321 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
322 scr_memsetw(s, vc->vc_scrl_erase_char, 2 * step);
323 }
324
325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
326 {
327 #ifndef VT_BUF_VRAM_ONLY
328 unsigned int xx, yy, offset;
329 u16 *p;
330
331 p = (u16 *) start;
332 if (!vc->vc_sw->con_getxy) {
333 offset = (start - vc->vc_origin) / 2;
334 xx = offset % vc->vc_cols;
335 yy = offset / vc->vc_cols;
336 } else {
337 int nxx, nyy;
338 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
339 xx = nxx; yy = nyy;
340 }
341 for(;;) {
342 u16 attrib = scr_readw(p) & 0xff00;
343 int startx = xx;
344 u16 *q = p;
345 while (xx < vc->vc_cols && count) {
346 if (attrib != (scr_readw(p) & 0xff00)) {
347 if (p > q)
348 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
349 startx = xx;
350 q = p;
351 attrib = scr_readw(p) & 0xff00;
352 }
353 p++;
354 xx++;
355 count--;
356 }
357 if (p > q)
358 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
359 if (!count)
360 break;
361 xx = 0;
362 yy++;
363 if (vc->vc_sw->con_getxy) {
364 p = (u16 *)start;
365 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
366 }
367 }
368 #endif
369 }
370
371 void update_region(struct vc_data *vc, unsigned long start, int count)
372 {
373 WARN_CONSOLE_UNLOCKED();
374
375 if (DO_UPDATE(vc)) {
376 hide_cursor(vc);
377 do_update_region(vc, start, count);
378 set_cursor(vc);
379 }
380 }
381
382 /* Structure of attributes is hardware-dependent */
383
384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
385 u8 _underline, u8 _reverse, u8 _italic)
386 {
387 if (vc->vc_sw->con_build_attr)
388 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
389 _blink, _underline, _reverse, _italic);
390
391 #ifndef VT_BUF_VRAM_ONLY
392 /*
393 * ++roman: I completely changed the attribute format for monochrome
394 * mode (!can_do_color). The formerly used MDA (monochrome display
395 * adapter) format didn't allow the combination of certain effects.
396 * Now the attribute is just a bit vector:
397 * Bit 0..1: intensity (0..2)
398 * Bit 2 : underline
399 * Bit 3 : reverse
400 * Bit 7 : blink
401 */
402 {
403 u8 a = _color;
404 if (!vc->vc_can_do_color)
405 return _intensity |
406 (_italic ? 2 : 0) |
407 (_underline ? 4 : 0) |
408 (_reverse ? 8 : 0) |
409 (_blink ? 0x80 : 0);
410 if (_italic)
411 a = (a & 0xF0) | vc->vc_itcolor;
412 else if (_underline)
413 a = (a & 0xf0) | vc->vc_ulcolor;
414 else if (_intensity == 0)
415 a = (a & 0xf0) | vc->vc_ulcolor;
416 if (_reverse)
417 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
418 if (_blink)
419 a ^= 0x80;
420 if (_intensity == 2)
421 a ^= 0x08;
422 if (vc->vc_hi_font_mask == 0x100)
423 a <<= 1;
424 return a;
425 }
426 #else
427 return 0;
428 #endif
429 }
430
431 static void update_attr(struct vc_data *vc)
432 {
433 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
434 vc->vc_blink, vc->vc_underline,
435 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
436 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
437 vc->vc_scrl_erase_char = (build_attr(vc, vc->vc_def_color, 1, false, false, false, false) << 8) | ' ';
438 }
439
440 /* Note: inverting the screen twice should revert to the original state */
441 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
442 {
443 unsigned short *p;
444
445 WARN_CONSOLE_UNLOCKED();
446
447 count /= 2;
448 p = screenpos(vc, offset, viewed);
449 if (vc->vc_sw->con_invert_region)
450 vc->vc_sw->con_invert_region(vc, p, count);
451 #ifndef VT_BUF_VRAM_ONLY
452 else {
453 u16 *q = p;
454 int cnt = count;
455 u16 a;
456
457 if (!vc->vc_can_do_color) {
458 while (cnt--) {
459 a = scr_readw(q);
460 a ^= 0x0800;
461 scr_writew(a, q);
462 q++;
463 }
464 } else if (vc->vc_hi_font_mask == 0x100) {
465 while (cnt--) {
466 a = scr_readw(q);
467 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
468 scr_writew(a, q);
469 q++;
470 }
471 } else {
472 while (cnt--) {
473 a = scr_readw(q);
474 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
475 scr_writew(a, q);
476 q++;
477 }
478 }
479 }
480 #endif
481 if (DO_UPDATE(vc))
482 do_update_region(vc, (unsigned long) p, count);
483 }
484
485 /* used by selection: complement pointer position */
486 void complement_pos(struct vc_data *vc, int offset)
487 {
488 static int old_offset = -1;
489 static unsigned short old;
490 static unsigned short oldx, oldy;
491
492 WARN_CONSOLE_UNLOCKED();
493
494 if (old_offset != -1 && old_offset >= 0 &&
495 old_offset < vc->vc_screenbuf_size) {
496 scr_writew(old, screenpos(vc, old_offset, 1));
497 if (DO_UPDATE(vc))
498 vc->vc_sw->con_putc(vc, old, oldy, oldx);
499 }
500
501 old_offset = offset;
502
503 if (offset != -1 && offset >= 0 &&
504 offset < vc->vc_screenbuf_size) {
505 unsigned short new;
506 unsigned short *p;
507 p = screenpos(vc, offset, 1);
508 old = scr_readw(p);
509 new = old ^ vc->vc_complement_mask;
510 scr_writew(new, p);
511 if (DO_UPDATE(vc)) {
512 oldx = (offset >> 1) % vc->vc_cols;
513 oldy = (offset >> 1) / vc->vc_cols;
514 vc->vc_sw->con_putc(vc, new, oldy, oldx);
515 }
516 }
517
518 }
519
520 static void insert_char(struct vc_data *vc, unsigned int nr)
521 {
522 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
523
524 p = q + vc->vc_cols - nr - vc->vc_x;
525 while (--p >= q)
526 scr_writew(scr_readw(p), p + nr);
527 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
528 vc->vc_need_wrap = 0;
529 if (DO_UPDATE(vc)) {
530 unsigned short oldattr = vc->vc_attr;
531 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
532 vc->vc_cols - vc->vc_x - nr);
533 vc->vc_attr = vc->vc_video_erase_char >> 8;
534 while (nr--)
535 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
536 vc->vc_attr = oldattr;
537 }
538 }
539
540 static void delete_char(struct vc_data *vc, unsigned int nr)
541 {
542 unsigned int i = vc->vc_x;
543 unsigned short *p = (unsigned short *)vc->vc_pos;
544
545 while (++i <= vc->vc_cols - nr) {
546 scr_writew(scr_readw(p+nr), p);
547 p++;
548 }
549 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
550 vc->vc_need_wrap = 0;
551 if (DO_UPDATE(vc)) {
552 unsigned short oldattr = vc->vc_attr;
553 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
554 vc->vc_cols - vc->vc_x - nr);
555 vc->vc_attr = vc->vc_video_erase_char >> 8;
556 while (nr--)
557 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
558 vc->vc_cols - 1 - nr);
559 vc->vc_attr = oldattr;
560 }
561 }
562
563 static int softcursor_original;
564
565 static void add_softcursor(struct vc_data *vc)
566 {
567 int i = scr_readw((u16 *) vc->vc_pos);
568 u32 type = vc->vc_cursor_type;
569
570 if (! (type & 0x10)) return;
571 if (softcursor_original != -1) return;
572 softcursor_original = i;
573 i |= ((type >> 8) & 0xff00 );
574 i ^= ((type) & 0xff00 );
575 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577 scr_writew(i, (u16 *) vc->vc_pos);
578 if (DO_UPDATE(vc))
579 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
580 }
581
582 static void hide_softcursor(struct vc_data *vc)
583 {
584 if (softcursor_original != -1) {
585 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, softcursor_original,
588 vc->vc_y, vc->vc_x);
589 softcursor_original = -1;
590 }
591 }
592
593 static void hide_cursor(struct vc_data *vc)
594 {
595 if (vc == sel_cons)
596 clear_selection();
597 vc->vc_sw->con_cursor(vc, CM_ERASE);
598 hide_softcursor(vc);
599 }
600
601 static void set_cursor(struct vc_data *vc)
602 {
603 if (!IS_FG(vc) || console_blanked ||
604 vc->vc_mode == KD_GRAPHICS)
605 return;
606 if (vc->vc_deccm) {
607 if (vc == sel_cons)
608 clear_selection();
609 add_softcursor(vc);
610 if ((vc->vc_cursor_type & 0x0f) != 1)
611 vc->vc_sw->con_cursor(vc, CM_DRAW);
612 } else
613 hide_cursor(vc);
614 }
615
616 static void set_origin(struct vc_data *vc)
617 {
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!CON_IS_VISIBLE(vc) ||
621 !vc->vc_sw->con_set_origin ||
622 !vc->vc_sw->con_set_origin(vc))
623 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624 vc->vc_visible_origin = vc->vc_origin;
625 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
627 }
628
629 static inline void save_screen(struct vc_data *vc)
630 {
631 WARN_CONSOLE_UNLOCKED();
632
633 if (vc->vc_sw->con_save_screen)
634 vc->vc_sw->con_save_screen(vc);
635 }
636
637 /*
638 * Redrawing of screen
639 */
640
641 static void clear_buffer_attributes(struct vc_data *vc)
642 {
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
646
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
649 }
650 }
651
652 void redraw_screen(struct vc_data *vc, int is_switch)
653 {
654 int redraw = 0;
655
656 WARN_CONSOLE_UNLOCKED();
657
658 if (!vc) {
659 /* strange ... */
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
661 return;
662 }
663
664 if (is_switch) {
665 struct vc_data *old_vc = vc_cons[fg_console].d;
666 if (old_vc == vc)
667 return;
668 if (!CON_IS_VISIBLE(vc))
669 redraw = 1;
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
672 hide_cursor(old_vc);
673 if (!CON_IS_VISIBLE(old_vc)) {
674 save_screen(old_vc);
675 set_origin(old_vc);
676 }
677 } else {
678 hide_cursor(vc);
679 redraw = 1;
680 }
681
682 if (redraw) {
683 int update;
684 int old_was_color = vc->vc_can_do_color;
685
686 set_origin(vc);
687 update = vc->vc_sw->con_switch(vc);
688 set_palette(vc);
689 /*
690 * If console changed from mono<->color, the best we can do
691 * is to clear the buffer attributes. As it currently stands,
692 * rebuilding new attributes from the old buffer is not doable
693 * without overly complex code.
694 */
695 if (old_was_color != vc->vc_can_do_color) {
696 update_attr(vc);
697 clear_buffer_attributes(vc);
698 }
699 if (update && vc->vc_mode != KD_GRAPHICS)
700 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
701 }
702 set_cursor(vc);
703 if (is_switch) {
704 set_leds();
705 compute_shiftstate();
706 notify_update(vc);
707 }
708 }
709
710 /*
711 * Allocation, freeing and resizing of VTs.
712 */
713
714 int vc_cons_allocated(unsigned int i)
715 {
716 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
717 }
718
719 static void visual_init(struct vc_data *vc, int num, int init)
720 {
721 /* ++Geert: vc->vc_sw->con_init determines console size */
722 if (vc->vc_sw)
723 module_put(vc->vc_sw->owner);
724 vc->vc_sw = conswitchp;
725 #ifndef VT_SINGLE_DRIVER
726 if (con_driver_map[num])
727 vc->vc_sw = con_driver_map[num];
728 #endif
729 __module_get(vc->vc_sw->owner);
730 vc->vc_num = num;
731 vc->vc_display_fg = &master_display_fg;
732 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
733 vc->vc_uni_pagedir = 0;
734 vc->vc_hi_font_mask = 0;
735 vc->vc_complement_mask = 0;
736 vc->vc_can_do_color = 0;
737 vc->vc_sw->con_init(vc, init);
738 if (!vc->vc_complement_mask)
739 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
740 vc->vc_s_complement_mask = vc->vc_complement_mask;
741 vc->vc_size_row = vc->vc_cols << 1;
742 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
743 }
744
745 int vc_allocate(unsigned int currcons) /* return 0 on success */
746 {
747 WARN_CONSOLE_UNLOCKED();
748
749 if (currcons >= MAX_NR_CONSOLES)
750 return -ENXIO;
751 if (!vc_cons[currcons].d) {
752 struct vc_data *vc;
753 struct vt_notifier_param param;
754
755 /* prevent users from taking too much memory */
756 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
757 return -EPERM;
758
759 /* due to the granularity of kmalloc, we waste some memory here */
760 /* the alloc is done in two steps, to optimize the common situation
761 of a 25x80 console (structsize=216, screenbuf_size=4000) */
762 /* although the numbers above are not valid since long ago, the
763 point is still up-to-date and the comment still has its value
764 even if only as a historical artifact. --mj, July 1998 */
765 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
766 if (!vc)
767 return -ENOMEM;
768 vc_cons[currcons].d = vc;
769 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
770 visual_init(vc, currcons, 1);
771 if (!*vc->vc_uni_pagedir_loc)
772 con_set_default_unimap(vc);
773 if (!vc->vc_kmalloced)
774 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
775 if (!vc->vc_screenbuf) {
776 kfree(vc);
777 vc_cons[currcons].d = NULL;
778 return -ENOMEM;
779 }
780 vc->vc_kmalloced = 1;
781 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
782 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
783 }
784 return 0;
785 }
786
787 static inline int resize_screen(struct vc_data *vc, int width, int height,
788 int user)
789 {
790 /* Resizes the resolution of the display adapater */
791 int err = 0;
792
793 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
794 err = vc->vc_sw->con_resize(vc, width, height, user);
795
796 return err;
797 }
798
799 /*
800 * Change # of rows and columns (0 means unchanged/the size of fg_console)
801 * [this is to be used together with some user program
802 * like resize that changes the hardware videomode]
803 */
804 #define VC_RESIZE_MAXCOL (32767)
805 #define VC_RESIZE_MAXROW (32767)
806 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
807 {
808 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
809 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
810 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
811 unsigned int end, user;
812 unsigned short *newscreen;
813
814 WARN_CONSOLE_UNLOCKED();
815
816 if (!vc)
817 return -ENXIO;
818
819 user = vc->vc_resize_user;
820 vc->vc_resize_user = 0;
821
822 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
823 return -EINVAL;
824
825 new_cols = (cols ? cols : vc->vc_cols);
826 new_rows = (lines ? lines : vc->vc_rows);
827 new_row_size = new_cols << 1;
828 new_screen_size = new_row_size * new_rows;
829
830 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
831 return 0;
832
833 newscreen = kmalloc(new_screen_size, GFP_USER);
834 if (!newscreen)
835 return -ENOMEM;
836
837 old_rows = vc->vc_rows;
838 old_cols = vc->vc_cols;
839 old_row_size = vc->vc_size_row;
840 old_screen_size = vc->vc_screenbuf_size;
841
842 err = resize_screen(vc, new_cols, new_rows, user);
843 if (err) {
844 kfree(newscreen);
845 return err;
846 }
847
848 vc->vc_rows = new_rows;
849 vc->vc_cols = new_cols;
850 vc->vc_size_row = new_row_size;
851 vc->vc_screenbuf_size = new_screen_size;
852
853 rlth = min(old_row_size, new_row_size);
854 rrem = new_row_size - rlth;
855 old_origin = vc->vc_origin;
856 new_origin = (long) newscreen;
857 new_scr_end = new_origin + new_screen_size;
858
859 if (vc->vc_y > new_rows) {
860 if (old_rows - vc->vc_y < new_rows) {
861 /*
862 * Cursor near the bottom, copy contents from the
863 * bottom of buffer
864 */
865 old_origin += (old_rows - new_rows) * old_row_size;
866 end = vc->vc_scr_end;
867 } else {
868 /*
869 * Cursor is in no man's land, copy 1/2 screenful
870 * from the top and bottom of cursor position
871 */
872 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
873 end = old_origin + (old_row_size * new_rows);
874 }
875 } else
876 /*
877 * Cursor near the top, copy contents from the top of buffer
878 */
879 end = (old_rows > new_rows) ? old_origin +
880 (old_row_size * new_rows) :
881 vc->vc_scr_end;
882
883 update_attr(vc);
884
885 while (old_origin < end) {
886 scr_memcpyw((unsigned short *) new_origin,
887 (unsigned short *) old_origin, rlth);
888 if (rrem)
889 scr_memsetw((void *)(new_origin + rlth),
890 vc->vc_video_erase_char, rrem);
891 old_origin += old_row_size;
892 new_origin += new_row_size;
893 }
894 if (new_scr_end > new_origin)
895 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
896 new_scr_end - new_origin);
897 if (vc->vc_kmalloced)
898 kfree(vc->vc_screenbuf);
899 vc->vc_screenbuf = newscreen;
900 vc->vc_kmalloced = 1;
901 vc->vc_screenbuf_size = new_screen_size;
902 set_origin(vc);
903
904 /* do part of a reset_terminal() */
905 vc->vc_top = 0;
906 vc->vc_bottom = vc->vc_rows;
907 gotoxy(vc, vc->vc_x, vc->vc_y);
908 save_cur(vc);
909
910 if (vc->vc_tty) {
911 struct winsize ws, *cws = &vc->vc_tty->winsize;
912 unsigned long flags;
913
914 memset(&ws, 0, sizeof(ws));
915 ws.ws_row = vc->vc_rows;
916 ws.ws_col = vc->vc_cols;
917 ws.ws_ypixel = vc->vc_scan_lines;
918
919 mutex_lock(&vc->vc_tty->termios_mutex);
920 spin_lock_irqsave(&vc->vc_tty->ctrl_lock, flags);
921 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
922 vc->vc_tty->pgrp)
923 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
924 spin_unlock_irqrestore(&vc->vc_tty->ctrl_lock, flags);
925 *cws = ws;
926 mutex_unlock(&vc->vc_tty->termios_mutex);
927 }
928
929 if (CON_IS_VISIBLE(vc))
930 update_screen(vc);
931 return err;
932 }
933
934 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
935 {
936 int rc;
937
938 acquire_console_sem();
939 rc = vc_resize(vc, cols, lines);
940 release_console_sem();
941 return rc;
942 }
943
944 void vc_deallocate(unsigned int currcons)
945 {
946 WARN_CONSOLE_UNLOCKED();
947
948 if (vc_cons_allocated(currcons)) {
949 struct vc_data *vc = vc_cons[currcons].d;
950 struct vt_notifier_param param = { .vc = vc };
951 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
952 vc->vc_sw->con_deinit(vc);
953 put_pid(vc->vt_pid);
954 module_put(vc->vc_sw->owner);
955 if (vc->vc_kmalloced)
956 kfree(vc->vc_screenbuf);
957 if (currcons >= MIN_NR_CONSOLES)
958 kfree(vc);
959 vc_cons[currcons].d = NULL;
960 }
961 }
962
963 /*
964 * VT102 emulator
965 */
966
967 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
968 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
969 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
970
971 #define decarm VC_REPEAT
972 #define decckm VC_CKMODE
973 #define kbdapplic VC_APPLIC
974 #define lnm VC_CRLF
975
976 /*
977 * this is what the terminal answers to a ESC-Z or csi0c query.
978 */
979 #define VT100ID "\033[?1;2c"
980 #define VT102ID "\033[?6c"
981
982 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
983 8,12,10,14, 9,13,11,15 };
984
985 /* the default colour table, for VGA+ colour systems */
986 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
987 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
988 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
989 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
990 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
991 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
992
993 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
994 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
995 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
996
997 /*
998 * gotoxy() must verify all boundaries, because the arguments
999 * might also be negative. If the given position is out of
1000 * bounds, the cursor is placed at the nearest margin.
1001 */
1002 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1003 {
1004 int min_y, max_y;
1005
1006 if (new_x < 0)
1007 vc->vc_x = 0;
1008 else {
1009 if (new_x >= vc->vc_cols)
1010 vc->vc_x = vc->vc_cols - 1;
1011 else
1012 vc->vc_x = new_x;
1013 }
1014
1015 if (vc->vc_decom) {
1016 min_y = vc->vc_top;
1017 max_y = vc->vc_bottom;
1018 } else {
1019 min_y = 0;
1020 max_y = vc->vc_rows;
1021 }
1022 if (new_y < min_y)
1023 vc->vc_y = min_y;
1024 else if (new_y >= max_y)
1025 vc->vc_y = max_y - 1;
1026 else
1027 vc->vc_y = new_y;
1028 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1029 vc->vc_need_wrap = 0;
1030 }
1031
1032 /* for absolute user moves, when decom is set */
1033 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1034 {
1035 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1036 }
1037
1038 void scrollback(struct vc_data *vc, int lines)
1039 {
1040 if (!lines)
1041 lines = vc->vc_rows / 2;
1042 scrolldelta(-lines);
1043 }
1044
1045 void scrollfront(struct vc_data *vc, int lines)
1046 {
1047 if (!lines)
1048 lines = vc->vc_rows / 2;
1049 scrolldelta(lines);
1050 }
1051
1052 static void lf(struct vc_data *vc)
1053 {
1054 /* don't scroll if above bottom of scrolling region, or
1055 * if below scrolling region
1056 */
1057 if (vc->vc_y + 1 == vc->vc_bottom)
1058 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1059 else if (vc->vc_y < vc->vc_rows - 1) {
1060 vc->vc_y++;
1061 vc->vc_pos += vc->vc_size_row;
1062 }
1063 vc->vc_need_wrap = 0;
1064 notify_write(vc, '\n');
1065 }
1066
1067 static void ri(struct vc_data *vc)
1068 {
1069 /* don't scroll if below top of scrolling region, or
1070 * if above scrolling region
1071 */
1072 if (vc->vc_y == vc->vc_top)
1073 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1074 else if (vc->vc_y > 0) {
1075 vc->vc_y--;
1076 vc->vc_pos -= vc->vc_size_row;
1077 }
1078 vc->vc_need_wrap = 0;
1079 }
1080
1081 static inline void cr(struct vc_data *vc)
1082 {
1083 vc->vc_pos -= vc->vc_x << 1;
1084 vc->vc_need_wrap = vc->vc_x = 0;
1085 notify_write(vc, '\r');
1086 }
1087
1088 static inline void bs(struct vc_data *vc)
1089 {
1090 if (vc->vc_x) {
1091 vc->vc_pos -= 2;
1092 vc->vc_x--;
1093 vc->vc_need_wrap = 0;
1094 notify_write(vc, '\b');
1095 }
1096 }
1097
1098 static inline void del(struct vc_data *vc)
1099 {
1100 /* ignored */
1101 }
1102
1103 static void csi_J(struct vc_data *vc, int vpar)
1104 {
1105 unsigned int count;
1106 unsigned short * start;
1107
1108 switch (vpar) {
1109 case 0: /* erase from cursor to end of display */
1110 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1111 start = (unsigned short *)vc->vc_pos;
1112 if (DO_UPDATE(vc)) {
1113 /* do in two stages */
1114 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1115 vc->vc_cols - vc->vc_x);
1116 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1117 vc->vc_rows - vc->vc_y - 1,
1118 vc->vc_cols);
1119 }
1120 break;
1121 case 1: /* erase from start to cursor */
1122 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1123 start = (unsigned short *)vc->vc_origin;
1124 if (DO_UPDATE(vc)) {
1125 /* do in two stages */
1126 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1127 vc->vc_cols);
1128 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1129 vc->vc_x + 1);
1130 }
1131 break;
1132 case 2: /* erase whole display */
1133 count = vc->vc_cols * vc->vc_rows;
1134 start = (unsigned short *)vc->vc_origin;
1135 if (DO_UPDATE(vc))
1136 vc->vc_sw->con_clear(vc, 0, 0,
1137 vc->vc_rows,
1138 vc->vc_cols);
1139 break;
1140 default:
1141 return;
1142 }
1143 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1144 vc->vc_need_wrap = 0;
1145 }
1146
1147 static void csi_K(struct vc_data *vc, int vpar)
1148 {
1149 unsigned int count;
1150 unsigned short * start;
1151
1152 switch (vpar) {
1153 case 0: /* erase from cursor to end of line */
1154 count = vc->vc_cols - vc->vc_x;
1155 start = (unsigned short *)vc->vc_pos;
1156 if (DO_UPDATE(vc))
1157 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1158 vc->vc_cols - vc->vc_x);
1159 break;
1160 case 1: /* erase from start of line to cursor */
1161 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1162 count = vc->vc_x + 1;
1163 if (DO_UPDATE(vc))
1164 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1165 vc->vc_x + 1);
1166 break;
1167 case 2: /* erase whole line */
1168 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1169 count = vc->vc_cols;
1170 if (DO_UPDATE(vc))
1171 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1172 vc->vc_cols);
1173 break;
1174 default:
1175 return;
1176 }
1177 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1178 vc->vc_need_wrap = 0;
1179 }
1180
1181 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1182 { /* not vt100? */
1183 int count;
1184
1185 if (!vpar)
1186 vpar++;
1187 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1188
1189 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1190 if (DO_UPDATE(vc))
1191 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1192 vc->vc_need_wrap = 0;
1193 }
1194
1195 static void default_attr(struct vc_data *vc)
1196 {
1197 vc->vc_intensity = 1;
1198 vc->vc_italic = 0;
1199 vc->vc_underline = 0;
1200 vc->vc_reverse = 0;
1201 vc->vc_blink = 0;
1202 vc->vc_color = vc->vc_def_color;
1203 }
1204
1205 /* console_sem is held */
1206 static void csi_m(struct vc_data *vc)
1207 {
1208 int i;
1209
1210 for (i = 0; i <= vc->vc_npar; i++)
1211 switch (vc->vc_par[i]) {
1212 case 0: /* all attributes off */
1213 default_attr(vc);
1214 break;
1215 case 1:
1216 vc->vc_intensity = 2;
1217 break;
1218 case 2:
1219 vc->vc_intensity = 0;
1220 break;
1221 case 3:
1222 vc->vc_italic = 1;
1223 break;
1224 case 4:
1225 vc->vc_underline = 1;
1226 break;
1227 case 5:
1228 vc->vc_blink = 1;
1229 break;
1230 case 7:
1231 vc->vc_reverse = 1;
1232 break;
1233 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1234 * Select primary font, don't display
1235 * control chars if defined, don't set
1236 * bit 8 on output.
1237 */
1238 vc->vc_translate = set_translate(vc->vc_charset == 0
1239 ? vc->vc_G0_charset
1240 : vc->vc_G1_charset, vc);
1241 vc->vc_disp_ctrl = 0;
1242 vc->vc_toggle_meta = 0;
1243 break;
1244 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1245 * Select first alternate font, lets
1246 * chars < 32 be displayed as ROM chars.
1247 */
1248 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1249 vc->vc_disp_ctrl = 1;
1250 vc->vc_toggle_meta = 0;
1251 break;
1252 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1253 * Select second alternate font, toggle
1254 * high bit before displaying as ROM char.
1255 */
1256 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1257 vc->vc_disp_ctrl = 1;
1258 vc->vc_toggle_meta = 1;
1259 break;
1260 case 21:
1261 case 22:
1262 vc->vc_intensity = 1;
1263 break;
1264 case 23:
1265 vc->vc_italic = 0;
1266 break;
1267 case 24:
1268 vc->vc_underline = 0;
1269 break;
1270 case 25:
1271 vc->vc_blink = 0;
1272 break;
1273 case 27:
1274 vc->vc_reverse = 0;
1275 break;
1276 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1277 * Enables underscore, white foreground
1278 * with white underscore (Linux - use
1279 * default foreground).
1280 */
1281 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1282 vc->vc_underline = 1;
1283 break;
1284 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1285 * Disable underline option.
1286 * Reset colour to default? It did this
1287 * before...
1288 */
1289 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1290 vc->vc_underline = 0;
1291 break;
1292 case 49:
1293 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1294 break;
1295 default:
1296 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1297 vc->vc_color = color_table[vc->vc_par[i] - 30]
1298 | (vc->vc_color & 0xf0);
1299 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1300 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1301 | (vc->vc_color & 0x0f);
1302 break;
1303 }
1304 update_attr(vc);
1305 }
1306
1307 static void respond_string(const char *p, struct tty_struct *tty)
1308 {
1309 while (*p) {
1310 tty_insert_flip_char(tty, *p, 0);
1311 p++;
1312 }
1313 con_schedule_flip(tty);
1314 }
1315
1316 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1317 {
1318 char buf[40];
1319
1320 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1321 respond_string(buf, tty);
1322 }
1323
1324 static inline void status_report(struct tty_struct *tty)
1325 {
1326 respond_string("\033[0n", tty); /* Terminal ok */
1327 }
1328
1329 static inline void respond_ID(struct tty_struct * tty)
1330 {
1331 respond_string(VT102ID, tty);
1332 }
1333
1334 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1335 {
1336 char buf[8];
1337
1338 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1339 (char)('!' + mry));
1340 respond_string(buf, tty);
1341 }
1342
1343 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1344 int mouse_reporting(void)
1345 {
1346 return vc_cons[fg_console].d->vc_report_mouse;
1347 }
1348
1349 /* console_sem is held */
1350 static void set_mode(struct vc_data *vc, int on_off)
1351 {
1352 int i;
1353
1354 for (i = 0; i <= vc->vc_npar; i++)
1355 if (vc->vc_ques) {
1356 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1357 case 1: /* Cursor keys send ^[Ox/^[[x */
1358 if (on_off)
1359 set_kbd(vc, decckm);
1360 else
1361 clr_kbd(vc, decckm);
1362 break;
1363 case 3: /* 80/132 mode switch unimplemented */
1364 vc->vc_deccolm = on_off;
1365 #if 0
1366 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1367 /* this alone does not suffice; some user mode
1368 utility has to change the hardware regs */
1369 #endif
1370 break;
1371 case 5: /* Inverted screen on/off */
1372 if (vc->vc_decscnm != on_off) {
1373 vc->vc_decscnm = on_off;
1374 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1375 update_attr(vc);
1376 }
1377 break;
1378 case 6: /* Origin relative/absolute */
1379 vc->vc_decom = on_off;
1380 gotoxay(vc, 0, 0);
1381 break;
1382 case 7: /* Autowrap on/off */
1383 vc->vc_decawm = on_off;
1384 break;
1385 case 8: /* Autorepeat on/off */
1386 if (on_off)
1387 set_kbd(vc, decarm);
1388 else
1389 clr_kbd(vc, decarm);
1390 break;
1391 case 9:
1392 vc->vc_report_mouse = on_off ? 1 : 0;
1393 break;
1394 case 25: /* Cursor on/off */
1395 vc->vc_deccm = on_off;
1396 break;
1397 case 1000:
1398 vc->vc_report_mouse = on_off ? 2 : 0;
1399 break;
1400 }
1401 } else {
1402 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1403 case 3: /* Monitor (display ctrls) */
1404 vc->vc_disp_ctrl = on_off;
1405 break;
1406 case 4: /* Insert Mode on/off */
1407 vc->vc_decim = on_off;
1408 break;
1409 case 20: /* Lf, Enter == CrLf/Lf */
1410 if (on_off)
1411 set_kbd(vc, lnm);
1412 else
1413 clr_kbd(vc, lnm);
1414 break;
1415 }
1416 }
1417 }
1418
1419 /* console_sem is held */
1420 static void setterm_command(struct vc_data *vc)
1421 {
1422 switch(vc->vc_par[0]) {
1423 case 1: /* set color for underline mode */
1424 if (vc->vc_can_do_color &&
1425 vc->vc_par[1] < 16) {
1426 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1427 if (vc->vc_underline)
1428 update_attr(vc);
1429 }
1430 break;
1431 case 2: /* set color for half intensity mode */
1432 if (vc->vc_can_do_color &&
1433 vc->vc_par[1] < 16) {
1434 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1435 if (vc->vc_intensity == 0)
1436 update_attr(vc);
1437 }
1438 break;
1439 case 8: /* store colors as defaults */
1440 vc->vc_def_color = vc->vc_attr;
1441 if (vc->vc_hi_font_mask == 0x100)
1442 vc->vc_def_color >>= 1;
1443 default_attr(vc);
1444 update_attr(vc);
1445 break;
1446 case 9: /* set blanking interval */
1447 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1448 poke_blanked_console();
1449 break;
1450 case 10: /* set bell frequency in Hz */
1451 if (vc->vc_npar >= 1)
1452 vc->vc_bell_pitch = vc->vc_par[1];
1453 else
1454 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1455 break;
1456 case 11: /* set bell duration in msec */
1457 if (vc->vc_npar >= 1)
1458 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1459 vc->vc_par[1] * HZ / 1000 : 0;
1460 else
1461 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1462 break;
1463 case 12: /* bring specified console to the front */
1464 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1465 set_console(vc->vc_par[1] - 1);
1466 break;
1467 case 13: /* unblank the screen */
1468 poke_blanked_console();
1469 break;
1470 case 14: /* set vesa powerdown interval */
1471 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1472 break;
1473 case 15: /* activate the previous console */
1474 set_console(last_console);
1475 break;
1476 }
1477 }
1478
1479 /* console_sem is held */
1480 static void csi_at(struct vc_data *vc, unsigned int nr)
1481 {
1482 if (nr > vc->vc_cols - vc->vc_x)
1483 nr = vc->vc_cols - vc->vc_x;
1484 else if (!nr)
1485 nr = 1;
1486 insert_char(vc, nr);
1487 }
1488
1489 /* console_sem is held */
1490 static void csi_L(struct vc_data *vc, unsigned int nr)
1491 {
1492 if (nr > vc->vc_rows - vc->vc_y)
1493 nr = vc->vc_rows - vc->vc_y;
1494 else if (!nr)
1495 nr = 1;
1496 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1497 vc->vc_need_wrap = 0;
1498 }
1499
1500 /* console_sem is held */
1501 static void csi_P(struct vc_data *vc, unsigned int nr)
1502 {
1503 if (nr > vc->vc_cols - vc->vc_x)
1504 nr = vc->vc_cols - vc->vc_x;
1505 else if (!nr)
1506 nr = 1;
1507 delete_char(vc, nr);
1508 }
1509
1510 /* console_sem is held */
1511 static void csi_M(struct vc_data *vc, unsigned int nr)
1512 {
1513 if (nr > vc->vc_rows - vc->vc_y)
1514 nr = vc->vc_rows - vc->vc_y;
1515 else if (!nr)
1516 nr=1;
1517 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1518 vc->vc_need_wrap = 0;
1519 }
1520
1521 /* console_sem is held (except via vc_init->reset_terminal */
1522 static void save_cur(struct vc_data *vc)
1523 {
1524 vc->vc_saved_x = vc->vc_x;
1525 vc->vc_saved_y = vc->vc_y;
1526 vc->vc_s_intensity = vc->vc_intensity;
1527 vc->vc_s_italic = vc->vc_italic;
1528 vc->vc_s_underline = vc->vc_underline;
1529 vc->vc_s_blink = vc->vc_blink;
1530 vc->vc_s_reverse = vc->vc_reverse;
1531 vc->vc_s_charset = vc->vc_charset;
1532 vc->vc_s_color = vc->vc_color;
1533 vc->vc_saved_G0 = vc->vc_G0_charset;
1534 vc->vc_saved_G1 = vc->vc_G1_charset;
1535 }
1536
1537 /* console_sem is held */
1538 static void restore_cur(struct vc_data *vc)
1539 {
1540 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1541 vc->vc_intensity = vc->vc_s_intensity;
1542 vc->vc_italic = vc->vc_s_italic;
1543 vc->vc_underline = vc->vc_s_underline;
1544 vc->vc_blink = vc->vc_s_blink;
1545 vc->vc_reverse = vc->vc_s_reverse;
1546 vc->vc_charset = vc->vc_s_charset;
1547 vc->vc_color = vc->vc_s_color;
1548 vc->vc_G0_charset = vc->vc_saved_G0;
1549 vc->vc_G1_charset = vc->vc_saved_G1;
1550 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1551 update_attr(vc);
1552 vc->vc_need_wrap = 0;
1553 }
1554
1555 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1556 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1557 ESpalette };
1558
1559 /* console_sem is held (except via vc_init()) */
1560 static void reset_terminal(struct vc_data *vc, int do_clear)
1561 {
1562 vc->vc_top = 0;
1563 vc->vc_bottom = vc->vc_rows;
1564 vc->vc_state = ESnormal;
1565 vc->vc_ques = 0;
1566 vc->vc_translate = set_translate(LAT1_MAP, vc);
1567 vc->vc_G0_charset = LAT1_MAP;
1568 vc->vc_G1_charset = GRAF_MAP;
1569 vc->vc_charset = 0;
1570 vc->vc_need_wrap = 0;
1571 vc->vc_report_mouse = 0;
1572 vc->vc_utf = default_utf8;
1573 vc->vc_utf_count = 0;
1574
1575 vc->vc_disp_ctrl = 0;
1576 vc->vc_toggle_meta = 0;
1577
1578 vc->vc_decscnm = 0;
1579 vc->vc_decom = 0;
1580 vc->vc_decawm = 1;
1581 vc->vc_deccm = 1;
1582 vc->vc_decim = 0;
1583
1584 set_kbd(vc, decarm);
1585 clr_kbd(vc, decckm);
1586 clr_kbd(vc, kbdapplic);
1587 clr_kbd(vc, lnm);
1588 kbd_table[vc->vc_num].lockstate = 0;
1589 kbd_table[vc->vc_num].slockstate = 0;
1590 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1591 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1592 /* do not do set_leds here because this causes an endless tasklet loop
1593 when the keyboard hasn't been initialized yet */
1594
1595 vc->vc_cursor_type = CUR_DEFAULT;
1596 vc->vc_complement_mask = vc->vc_s_complement_mask;
1597
1598 default_attr(vc);
1599 update_attr(vc);
1600
1601 vc->vc_tab_stop[0] = 0x01010100;
1602 vc->vc_tab_stop[1] =
1603 vc->vc_tab_stop[2] =
1604 vc->vc_tab_stop[3] =
1605 vc->vc_tab_stop[4] = 0x01010101;
1606
1607 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1608 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1609
1610 gotoxy(vc, 0, 0);
1611 save_cur(vc);
1612 if (do_clear)
1613 csi_J(vc, 2);
1614 }
1615
1616 /* console_sem is held */
1617 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1618 {
1619 /*
1620 * Control characters can be used in the _middle_
1621 * of an escape sequence.
1622 */
1623 switch (c) {
1624 case 0:
1625 return;
1626 case 7:
1627 if (vc->vc_bell_duration)
1628 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1629 return;
1630 case 8:
1631 bs(vc);
1632 return;
1633 case 9:
1634 vc->vc_pos -= (vc->vc_x << 1);
1635 while (vc->vc_x < vc->vc_cols - 1) {
1636 vc->vc_x++;
1637 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1638 break;
1639 }
1640 vc->vc_pos += (vc->vc_x << 1);
1641 notify_write(vc, '\t');
1642 return;
1643 case 10: case 11: case 12:
1644 lf(vc);
1645 if (!is_kbd(vc, lnm))
1646 return;
1647 case 13:
1648 cr(vc);
1649 return;
1650 case 14:
1651 vc->vc_charset = 1;
1652 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1653 vc->vc_disp_ctrl = 1;
1654 return;
1655 case 15:
1656 vc->vc_charset = 0;
1657 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1658 vc->vc_disp_ctrl = 0;
1659 return;
1660 case 24: case 26:
1661 vc->vc_state = ESnormal;
1662 return;
1663 case 27:
1664 vc->vc_state = ESesc;
1665 return;
1666 case 127:
1667 del(vc);
1668 return;
1669 case 128+27:
1670 vc->vc_state = ESsquare;
1671 return;
1672 }
1673 switch(vc->vc_state) {
1674 case ESesc:
1675 vc->vc_state = ESnormal;
1676 switch (c) {
1677 case '[':
1678 vc->vc_state = ESsquare;
1679 return;
1680 case ']':
1681 vc->vc_state = ESnonstd;
1682 return;
1683 case '%':
1684 vc->vc_state = ESpercent;
1685 return;
1686 case 'E':
1687 cr(vc);
1688 lf(vc);
1689 return;
1690 case 'M':
1691 ri(vc);
1692 return;
1693 case 'D':
1694 lf(vc);
1695 return;
1696 case 'H':
1697 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1698 return;
1699 case 'Z':
1700 respond_ID(tty);
1701 return;
1702 case '7':
1703 save_cur(vc);
1704 return;
1705 case '8':
1706 restore_cur(vc);
1707 return;
1708 case '(':
1709 vc->vc_state = ESsetG0;
1710 return;
1711 case ')':
1712 vc->vc_state = ESsetG1;
1713 return;
1714 case '#':
1715 vc->vc_state = EShash;
1716 return;
1717 case 'c':
1718 reset_terminal(vc, 1);
1719 return;
1720 case '>': /* Numeric keypad */
1721 clr_kbd(vc, kbdapplic);
1722 return;
1723 case '=': /* Appl. keypad */
1724 set_kbd(vc, kbdapplic);
1725 return;
1726 }
1727 return;
1728 case ESnonstd:
1729 if (c=='P') { /* palette escape sequence */
1730 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1731 vc->vc_par[vc->vc_npar] = 0;
1732 vc->vc_npar = 0;
1733 vc->vc_state = ESpalette;
1734 return;
1735 } else if (c=='R') { /* reset palette */
1736 reset_palette(vc);
1737 vc->vc_state = ESnormal;
1738 } else
1739 vc->vc_state = ESnormal;
1740 return;
1741 case ESpalette:
1742 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1743 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1744 if (vc->vc_npar == 7) {
1745 int i = vc->vc_par[0] * 3, j = 1;
1746 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1747 vc->vc_palette[i++] += vc->vc_par[j++];
1748 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1749 vc->vc_palette[i++] += vc->vc_par[j++];
1750 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1751 vc->vc_palette[i] += vc->vc_par[j];
1752 set_palette(vc);
1753 vc->vc_state = ESnormal;
1754 }
1755 } else
1756 vc->vc_state = ESnormal;
1757 return;
1758 case ESsquare:
1759 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1760 vc->vc_par[vc->vc_npar] = 0;
1761 vc->vc_npar = 0;
1762 vc->vc_state = ESgetpars;
1763 if (c == '[') { /* Function key */
1764 vc->vc_state=ESfunckey;
1765 return;
1766 }
1767 vc->vc_ques = (c == '?');
1768 if (vc->vc_ques)
1769 return;
1770 case ESgetpars:
1771 if (c == ';' && vc->vc_npar < NPAR - 1) {
1772 vc->vc_npar++;
1773 return;
1774 } else if (c>='0' && c<='9') {
1775 vc->vc_par[vc->vc_npar] *= 10;
1776 vc->vc_par[vc->vc_npar] += c - '0';
1777 return;
1778 } else
1779 vc->vc_state = ESgotpars;
1780 case ESgotpars:
1781 vc->vc_state = ESnormal;
1782 switch(c) {
1783 case 'h':
1784 set_mode(vc, 1);
1785 return;
1786 case 'l':
1787 set_mode(vc, 0);
1788 return;
1789 case 'c':
1790 if (vc->vc_ques) {
1791 if (vc->vc_par[0])
1792 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1793 else
1794 vc->vc_cursor_type = CUR_DEFAULT;
1795 return;
1796 }
1797 break;
1798 case 'm':
1799 if (vc->vc_ques) {
1800 clear_selection();
1801 if (vc->vc_par[0])
1802 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1803 else
1804 vc->vc_complement_mask = vc->vc_s_complement_mask;
1805 return;
1806 }
1807 break;
1808 case 'n':
1809 if (!vc->vc_ques) {
1810 if (vc->vc_par[0] == 5)
1811 status_report(tty);
1812 else if (vc->vc_par[0] == 6)
1813 cursor_report(vc, tty);
1814 }
1815 return;
1816 }
1817 if (vc->vc_ques) {
1818 vc->vc_ques = 0;
1819 return;
1820 }
1821 switch(c) {
1822 case 'G': case '`':
1823 if (vc->vc_par[0])
1824 vc->vc_par[0]--;
1825 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1826 return;
1827 case 'A':
1828 if (!vc->vc_par[0])
1829 vc->vc_par[0]++;
1830 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1831 return;
1832 case 'B': case 'e':
1833 if (!vc->vc_par[0])
1834 vc->vc_par[0]++;
1835 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1836 return;
1837 case 'C': case 'a':
1838 if (!vc->vc_par[0])
1839 vc->vc_par[0]++;
1840 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1841 return;
1842 case 'D':
1843 if (!vc->vc_par[0])
1844 vc->vc_par[0]++;
1845 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1846 return;
1847 case 'E':
1848 if (!vc->vc_par[0])
1849 vc->vc_par[0]++;
1850 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1851 return;
1852 case 'F':
1853 if (!vc->vc_par[0])
1854 vc->vc_par[0]++;
1855 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1856 return;
1857 case 'd':
1858 if (vc->vc_par[0])
1859 vc->vc_par[0]--;
1860 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1861 return;
1862 case 'H': case 'f':
1863 if (vc->vc_par[0])
1864 vc->vc_par[0]--;
1865 if (vc->vc_par[1])
1866 vc->vc_par[1]--;
1867 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1868 return;
1869 case 'J':
1870 csi_J(vc, vc->vc_par[0]);
1871 return;
1872 case 'K':
1873 csi_K(vc, vc->vc_par[0]);
1874 return;
1875 case 'L':
1876 csi_L(vc, vc->vc_par[0]);
1877 return;
1878 case 'M':
1879 csi_M(vc, vc->vc_par[0]);
1880 return;
1881 case 'P':
1882 csi_P(vc, vc->vc_par[0]);
1883 return;
1884 case 'c':
1885 if (!vc->vc_par[0])
1886 respond_ID(tty);
1887 return;
1888 case 'g':
1889 if (!vc->vc_par[0])
1890 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1891 else if (vc->vc_par[0] == 3) {
1892 vc->vc_tab_stop[0] =
1893 vc->vc_tab_stop[1] =
1894 vc->vc_tab_stop[2] =
1895 vc->vc_tab_stop[3] =
1896 vc->vc_tab_stop[4] = 0;
1897 }
1898 return;
1899 case 'm':
1900 csi_m(vc);
1901 return;
1902 case 'q': /* DECLL - but only 3 leds */
1903 /* map 0,1,2,3 to 0,1,2,4 */
1904 if (vc->vc_par[0] < 4)
1905 setledstate(kbd_table + vc->vc_num,
1906 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1907 return;
1908 case 'r':
1909 if (!vc->vc_par[0])
1910 vc->vc_par[0]++;
1911 if (!vc->vc_par[1])
1912 vc->vc_par[1] = vc->vc_rows;
1913 /* Minimum allowed region is 2 lines */
1914 if (vc->vc_par[0] < vc->vc_par[1] &&
1915 vc->vc_par[1] <= vc->vc_rows) {
1916 vc->vc_top = vc->vc_par[0] - 1;
1917 vc->vc_bottom = vc->vc_par[1];
1918 gotoxay(vc, 0, 0);
1919 }
1920 return;
1921 case 's':
1922 save_cur(vc);
1923 return;
1924 case 'u':
1925 restore_cur(vc);
1926 return;
1927 case 'X':
1928 csi_X(vc, vc->vc_par[0]);
1929 return;
1930 case '@':
1931 csi_at(vc, vc->vc_par[0]);
1932 return;
1933 case ']': /* setterm functions */
1934 setterm_command(vc);
1935 return;
1936 }
1937 return;
1938 case ESpercent:
1939 vc->vc_state = ESnormal;
1940 switch (c) {
1941 case '@': /* defined in ISO 2022 */
1942 vc->vc_utf = 0;
1943 return;
1944 case 'G': /* prelim official escape code */
1945 case '8': /* retained for compatibility */
1946 vc->vc_utf = 1;
1947 return;
1948 }
1949 return;
1950 case ESfunckey:
1951 vc->vc_state = ESnormal;
1952 return;
1953 case EShash:
1954 vc->vc_state = ESnormal;
1955 if (c == '8') {
1956 /* DEC screen alignment test. kludge :-) */
1957 vc->vc_video_erase_char =
1958 (vc->vc_video_erase_char & 0xff00) | 'E';
1959 csi_J(vc, 2);
1960 vc->vc_video_erase_char =
1961 (vc->vc_video_erase_char & 0xff00) | ' ';
1962 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1963 }
1964 return;
1965 case ESsetG0:
1966 if (c == '0')
1967 vc->vc_G0_charset = GRAF_MAP;
1968 else if (c == 'B')
1969 vc->vc_G0_charset = LAT1_MAP;
1970 else if (c == 'U')
1971 vc->vc_G0_charset = IBMPC_MAP;
1972 else if (c == 'K')
1973 vc->vc_G0_charset = USER_MAP;
1974 if (vc->vc_charset == 0)
1975 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1976 vc->vc_state = ESnormal;
1977 return;
1978 case ESsetG1:
1979 if (c == '0')
1980 vc->vc_G1_charset = GRAF_MAP;
1981 else if (c == 'B')
1982 vc->vc_G1_charset = LAT1_MAP;
1983 else if (c == 'U')
1984 vc->vc_G1_charset = IBMPC_MAP;
1985 else if (c == 'K')
1986 vc->vc_G1_charset = USER_MAP;
1987 if (vc->vc_charset == 1)
1988 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1989 vc->vc_state = ESnormal;
1990 return;
1991 default:
1992 vc->vc_state = ESnormal;
1993 }
1994 }
1995
1996 /* This is a temporary buffer used to prepare a tty console write
1997 * so that we can easily avoid touching user space while holding the
1998 * console spinlock. It is allocated in con_init and is shared by
1999 * this code and the vc_screen read/write tty calls.
2000 *
2001 * We have to allocate this statically in the kernel data section
2002 * since console_init (and thus con_init) are called before any
2003 * kernel memory allocation is available.
2004 */
2005 char con_buf[CON_BUF_SIZE];
2006 DEFINE_MUTEX(con_buf_mtx);
2007
2008 /* is_double_width() is based on the wcwidth() implementation by
2009 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2010 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2011 */
2012 struct interval {
2013 uint32_t first;
2014 uint32_t last;
2015 };
2016
2017 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2018 {
2019 int min = 0;
2020 int mid;
2021
2022 if (ucs < table[0].first || ucs > table[max].last)
2023 return 0;
2024 while (max >= min) {
2025 mid = (min + max) / 2;
2026 if (ucs > table[mid].last)
2027 min = mid + 1;
2028 else if (ucs < table[mid].first)
2029 max = mid - 1;
2030 else
2031 return 1;
2032 }
2033 return 0;
2034 }
2035
2036 static int is_double_width(uint32_t ucs)
2037 {
2038 static const struct interval double_width[] = {
2039 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2040 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2041 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2042 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2043 };
2044 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2045 }
2046
2047 /* acquires console_sem */
2048 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2049 {
2050 #ifdef VT_BUF_VRAM_ONLY
2051 #define FLUSH do { } while(0);
2052 #else
2053 #define FLUSH if (draw_x >= 0) { \
2054 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2055 draw_x = -1; \
2056 }
2057 #endif
2058
2059 int c, tc, ok, n = 0, draw_x = -1;
2060 unsigned int currcons;
2061 unsigned long draw_from = 0, draw_to = 0;
2062 struct vc_data *vc;
2063 unsigned char vc_attr;
2064 struct vt_notifier_param param;
2065 uint8_t rescan;
2066 uint8_t inverse;
2067 uint8_t width;
2068 u16 himask, charmask;
2069 const unsigned char *orig_buf = NULL;
2070 int orig_count;
2071
2072 if (in_interrupt())
2073 return count;
2074
2075 might_sleep();
2076
2077 acquire_console_sem();
2078 vc = tty->driver_data;
2079 if (vc == NULL) {
2080 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2081 release_console_sem();
2082 return 0;
2083 }
2084
2085 currcons = vc->vc_num;
2086 if (!vc_cons_allocated(currcons)) {
2087 /* could this happen? */
2088 static int error = 0;
2089 if (!error) {
2090 error = 1;
2091 printk("con_write: tty %d not allocated\n", currcons+1);
2092 }
2093 release_console_sem();
2094 return 0;
2095 }
2096 release_console_sem();
2097
2098 orig_buf = buf;
2099 orig_count = count;
2100
2101 /* At this point 'buf' is guaranteed to be a kernel buffer
2102 * and therefore no access to userspace (and therefore sleeping)
2103 * will be needed. The con_buf_mtx serializes all tty based
2104 * console rendering and vcs write/read operations. We hold
2105 * the console spinlock during the entire write.
2106 */
2107
2108 acquire_console_sem();
2109
2110 vc = tty->driver_data;
2111 if (vc == NULL) {
2112 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2113 release_console_sem();
2114 goto out;
2115 }
2116
2117 himask = vc->vc_hi_font_mask;
2118 charmask = himask ? 0x1ff : 0xff;
2119
2120 /* undraw cursor first */
2121 if (IS_FG(vc))
2122 hide_cursor(vc);
2123
2124 param.vc = vc;
2125
2126 while (!tty->stopped && count) {
2127 int orig = *buf;
2128 c = orig;
2129 buf++;
2130 n++;
2131 count--;
2132 rescan = 0;
2133 inverse = 0;
2134 width = 1;
2135
2136 /* Do no translation at all in control states */
2137 if (vc->vc_state != ESnormal) {
2138 tc = c;
2139 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2140 /* Combine UTF-8 into Unicode in vc_utf_char.
2141 * vc_utf_count is the number of continuation bytes still
2142 * expected to arrive.
2143 * vc_npar is the number of continuation bytes arrived so
2144 * far
2145 */
2146 rescan_last_byte:
2147 if ((c & 0xc0) == 0x80) {
2148 /* Continuation byte received */
2149 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2150 if (vc->vc_utf_count) {
2151 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2152 vc->vc_npar++;
2153 if (--vc->vc_utf_count) {
2154 /* Still need some bytes */
2155 continue;
2156 }
2157 /* Got a whole character */
2158 c = vc->vc_utf_char;
2159 /* Reject overlong sequences */
2160 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2161 c > utf8_length_changes[vc->vc_npar])
2162 c = 0xfffd;
2163 } else {
2164 /* Unexpected continuation byte */
2165 vc->vc_utf_count = 0;
2166 c = 0xfffd;
2167 }
2168 } else {
2169 /* Single ASCII byte or first byte of a sequence received */
2170 if (vc->vc_utf_count) {
2171 /* Continuation byte expected */
2172 rescan = 1;
2173 vc->vc_utf_count = 0;
2174 c = 0xfffd;
2175 } else if (c > 0x7f) {
2176 /* First byte of a multibyte sequence received */
2177 vc->vc_npar = 0;
2178 if ((c & 0xe0) == 0xc0) {
2179 vc->vc_utf_count = 1;
2180 vc->vc_utf_char = (c & 0x1f);
2181 } else if ((c & 0xf0) == 0xe0) {
2182 vc->vc_utf_count = 2;
2183 vc->vc_utf_char = (c & 0x0f);
2184 } else if ((c & 0xf8) == 0xf0) {
2185 vc->vc_utf_count = 3;
2186 vc->vc_utf_char = (c & 0x07);
2187 } else if ((c & 0xfc) == 0xf8) {
2188 vc->vc_utf_count = 4;
2189 vc->vc_utf_char = (c & 0x03);
2190 } else if ((c & 0xfe) == 0xfc) {
2191 vc->vc_utf_count = 5;
2192 vc->vc_utf_char = (c & 0x01);
2193 } else {
2194 /* 254 and 255 are invalid */
2195 c = 0xfffd;
2196 }
2197 if (vc->vc_utf_count) {
2198 /* Still need some bytes */
2199 continue;
2200 }
2201 }
2202 /* Nothing to do if an ASCII byte was received */
2203 }
2204 /* End of UTF-8 decoding. */
2205 /* c is the received character, or U+FFFD for invalid sequences. */
2206 /* Replace invalid Unicode code points with U+FFFD too */
2207 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2208 c = 0xfffd;
2209 tc = c;
2210 } else { /* no utf or alternate charset mode */
2211 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2212 }
2213
2214 param.c = tc;
2215 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2216 &param) == NOTIFY_STOP)
2217 continue;
2218
2219 /* If the original code was a control character we
2220 * only allow a glyph to be displayed if the code is
2221 * not normally used (such as for cursor movement) or
2222 * if the disp_ctrl mode has been explicitly enabled.
2223 * Certain characters (as given by the CTRL_ALWAYS
2224 * bitmap) are always displayed as control characters,
2225 * as the console would be pretty useless without
2226 * them; to display an arbitrary font position use the
2227 * direct-to-font zone in UTF-8 mode.
2228 */
2229 ok = tc && (c >= 32 ||
2230 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2231 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2232 && (c != 127 || vc->vc_disp_ctrl)
2233 && (c != 128+27);
2234
2235 if (vc->vc_state == ESnormal && ok) {
2236 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2237 if (is_double_width(c))
2238 width = 2;
2239 }
2240 /* Now try to find out how to display it */
2241 tc = conv_uni_to_pc(vc, tc);
2242 if (tc & ~charmask) {
2243 if (tc == -1 || tc == -2) {
2244 continue; /* nothing to display */
2245 }
2246 /* Glyph not found */
2247 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2248 /* In legacy mode use the glyph we get by a 1:1 mapping.
2249 This would make absolutely no sense with Unicode in mind,
2250 but do this for ASCII characters since a font may lack
2251 Unicode mapping info and we don't want to end up with
2252 having question marks only. */
2253 tc = c;
2254 } else {
2255 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2256 tc = conv_uni_to_pc(vc, 0xfffd);
2257 if (tc < 0) {
2258 inverse = 1;
2259 tc = conv_uni_to_pc(vc, '?');
2260 if (tc < 0) tc = '?';
2261 }
2262 }
2263 }
2264
2265 if (!inverse) {
2266 vc_attr = vc->vc_attr;
2267 } else {
2268 /* invert vc_attr */
2269 if (!vc->vc_can_do_color) {
2270 vc_attr = (vc->vc_attr) ^ 0x08;
2271 } else if (vc->vc_hi_font_mask == 0x100) {
2272 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2273 } else {
2274 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2275 }
2276 FLUSH
2277 }
2278
2279 while (1) {
2280 if (vc->vc_need_wrap || vc->vc_decim)
2281 FLUSH
2282 if (vc->vc_need_wrap) {
2283 cr(vc);
2284 lf(vc);
2285 }
2286 if (vc->vc_decim)
2287 insert_char(vc, 1);
2288 scr_writew(himask ?
2289 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2290 (vc_attr << 8) + tc,
2291 (u16 *) vc->vc_pos);
2292 if (DO_UPDATE(vc) && draw_x < 0) {
2293 draw_x = vc->vc_x;
2294 draw_from = vc->vc_pos;
2295 }
2296 if (vc->vc_x == vc->vc_cols - 1) {
2297 vc->vc_need_wrap = vc->vc_decawm;
2298 draw_to = vc->vc_pos + 2;
2299 } else {
2300 vc->vc_x++;
2301 draw_to = (vc->vc_pos += 2);
2302 }
2303
2304 if (!--width) break;
2305
2306 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2307 if (tc < 0) tc = ' ';
2308 }
2309 notify_write(vc, c);
2310
2311 if (inverse) {
2312 FLUSH
2313 }
2314
2315 if (rescan) {
2316 rescan = 0;
2317 inverse = 0;
2318 width = 1;
2319 c = orig;
2320 goto rescan_last_byte;
2321 }
2322 continue;
2323 }
2324 FLUSH
2325 do_con_trol(tty, vc, orig);
2326 }
2327 FLUSH
2328 console_conditional_schedule();
2329 release_console_sem();
2330
2331 out:
2332 notify_update(vc);
2333 return n;
2334 #undef FLUSH
2335 }
2336
2337 /*
2338 * This is the console switching callback.
2339 *
2340 * Doing console switching in a process context allows
2341 * us to do the switches asynchronously (needed when we want
2342 * to switch due to a keyboard interrupt). Synchronization
2343 * with other console code and prevention of re-entrancy is
2344 * ensured with console_sem.
2345 */
2346 static void console_callback(struct work_struct *ignored)
2347 {
2348 acquire_console_sem();
2349
2350 if (want_console >= 0) {
2351 if (want_console != fg_console &&
2352 vc_cons_allocated(want_console)) {
2353 hide_cursor(vc_cons[fg_console].d);
2354 change_console(vc_cons[want_console].d);
2355 /* we only changed when the console had already
2356 been allocated - a new console is not created
2357 in an interrupt routine */
2358 }
2359 want_console = -1;
2360 }
2361 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2362 do_poke_blanked_console = 0;
2363 poke_blanked_console();
2364 }
2365 if (scrollback_delta) {
2366 struct vc_data *vc = vc_cons[fg_console].d;
2367 clear_selection();
2368 if (vc->vc_mode == KD_TEXT)
2369 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2370 scrollback_delta = 0;
2371 }
2372 if (blank_timer_expired) {
2373 do_blank_screen(0);
2374 blank_timer_expired = 0;
2375 }
2376 notify_update(vc_cons[fg_console].d);
2377
2378 release_console_sem();
2379 }
2380
2381 int set_console(int nr)
2382 {
2383 struct vc_data *vc = vc_cons[fg_console].d;
2384
2385 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2386 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2387
2388 /*
2389 * Console switch will fail in console_callback() or
2390 * change_console() so there is no point scheduling
2391 * the callback
2392 *
2393 * Existing set_console() users don't check the return
2394 * value so this shouldn't break anything
2395 */
2396 return -EINVAL;
2397 }
2398
2399 want_console = nr;
2400 schedule_console_callback();
2401
2402 return 0;
2403 }
2404
2405 struct tty_driver *console_driver;
2406
2407 #ifdef CONFIG_VT_CONSOLE
2408
2409 /*
2410 * Console on virtual terminal
2411 *
2412 * The console must be locked when we get here.
2413 */
2414
2415 static void vt_console_print(struct console *co, const char *b, unsigned count)
2416 {
2417 struct vc_data *vc = vc_cons[fg_console].d;
2418 unsigned char c;
2419 static DEFINE_SPINLOCK(printing_lock);
2420 const ushort *start;
2421 ushort cnt = 0;
2422 ushort myx;
2423
2424 /* console busy or not yet initialized */
2425 if (!printable)
2426 return;
2427 if (!spin_trylock(&printing_lock))
2428 return;
2429
2430 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2431 vc = vc_cons[kmsg_redirect - 1].d;
2432
2433 /* read `x' only after setting currcons properly (otherwise
2434 the `x' macro will read the x of the foreground console). */
2435 myx = vc->vc_x;
2436
2437 if (!vc_cons_allocated(fg_console)) {
2438 /* impossible */
2439 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2440 goto quit;
2441 }
2442
2443 if (vc->vc_mode != KD_TEXT)
2444 goto quit;
2445
2446 /* undraw cursor first */
2447 if (IS_FG(vc))
2448 hide_cursor(vc);
2449
2450 start = (ushort *)vc->vc_pos;
2451
2452 /* Contrived structure to try to emulate original need_wrap behaviour
2453 * Problems caused when we have need_wrap set on '\n' character */
2454 while (count--) {
2455 c = *b++;
2456 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2457 if (cnt > 0) {
2458 if (CON_IS_VISIBLE(vc))
2459 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2460 vc->vc_x += cnt;
2461 if (vc->vc_need_wrap)
2462 vc->vc_x--;
2463 cnt = 0;
2464 }
2465 if (c == 8) { /* backspace */
2466 bs(vc);
2467 start = (ushort *)vc->vc_pos;
2468 myx = vc->vc_x;
2469 continue;
2470 }
2471 if (c != 13)
2472 lf(vc);
2473 cr(vc);
2474 start = (ushort *)vc->vc_pos;
2475 myx = vc->vc_x;
2476 if (c == 10 || c == 13)
2477 continue;
2478 }
2479 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2480 notify_write(vc, c);
2481 cnt++;
2482 if (myx == vc->vc_cols - 1) {
2483 vc->vc_need_wrap = 1;
2484 continue;
2485 }
2486 vc->vc_pos += 2;
2487 myx++;
2488 }
2489 if (cnt > 0) {
2490 if (CON_IS_VISIBLE(vc))
2491 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2492 vc->vc_x += cnt;
2493 if (vc->vc_x == vc->vc_cols) {
2494 vc->vc_x--;
2495 vc->vc_need_wrap = 1;
2496 }
2497 }
2498 set_cursor(vc);
2499 notify_update(vc);
2500
2501 quit:
2502 spin_unlock(&printing_lock);
2503 }
2504
2505 static struct tty_driver *vt_console_device(struct console *c, int *index)
2506 {
2507 *index = c->index ? c->index-1 : fg_console;
2508 return console_driver;
2509 }
2510
2511 static struct console vt_console_driver = {
2512 .name = "tty",
2513 .write = vt_console_print,
2514 .device = vt_console_device,
2515 .unblank = unblank_screen,
2516 .flags = CON_PRINTBUFFER,
2517 .index = -1,
2518 };
2519 #endif
2520
2521 /*
2522 * Handling of Linux-specific VC ioctls
2523 */
2524
2525 /*
2526 * Generally a bit racy with respect to console_sem().
2527 *
2528 * There are some functions which don't need it.
2529 *
2530 * There are some functions which can sleep for arbitrary periods
2531 * (paste_selection) but we don't need the lock there anyway.
2532 *
2533 * set_selection has locking, and definitely needs it
2534 */
2535
2536 int tioclinux(struct tty_struct *tty, unsigned long arg)
2537 {
2538 char type, data;
2539 char __user *p = (char __user *)arg;
2540 int lines;
2541 int ret;
2542
2543 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2544 return -EINVAL;
2545 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2546 return -EPERM;
2547 if (get_user(type, p))
2548 return -EFAULT;
2549 ret = 0;
2550
2551 lock_kernel();
2552
2553 switch (type)
2554 {
2555 case TIOCL_SETSEL:
2556 acquire_console_sem();
2557 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2558 release_console_sem();
2559 break;
2560 case TIOCL_PASTESEL:
2561 ret = paste_selection(tty);
2562 break;
2563 case TIOCL_UNBLANKSCREEN:
2564 acquire_console_sem();
2565 unblank_screen();
2566 release_console_sem();
2567 break;
2568 case TIOCL_SELLOADLUT:
2569 ret = sel_loadlut(p);
2570 break;
2571 case TIOCL_GETSHIFTSTATE:
2572
2573 /*
2574 * Make it possible to react to Shift+Mousebutton.
2575 * Note that 'shift_state' is an undocumented
2576 * kernel-internal variable; programs not closely
2577 * related to the kernel should not use this.
2578 */
2579 data = shift_state;
2580 ret = __put_user(data, p);
2581 break;
2582 case TIOCL_GETMOUSEREPORTING:
2583 data = mouse_reporting();
2584 ret = __put_user(data, p);
2585 break;
2586 case TIOCL_SETVESABLANK:
2587 ret = set_vesa_blanking(p);
2588 break;
2589 case TIOCL_GETKMSGREDIRECT:
2590 data = kmsg_redirect;
2591 ret = __put_user(data, p);
2592 break;
2593 case TIOCL_SETKMSGREDIRECT:
2594 if (!capable(CAP_SYS_ADMIN)) {
2595 ret = -EPERM;
2596 } else {
2597 if (get_user(data, p+1))
2598 ret = -EFAULT;
2599 else
2600 kmsg_redirect = data;
2601 }
2602 break;
2603 case TIOCL_GETFGCONSOLE:
2604 ret = fg_console;
2605 break;
2606 case TIOCL_SCROLLCONSOLE:
2607 if (get_user(lines, (s32 __user *)(p+4))) {
2608 ret = -EFAULT;
2609 } else {
2610 scrollfront(vc_cons[fg_console].d, lines);
2611 ret = 0;
2612 }
2613 break;
2614 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2615 acquire_console_sem();
2616 ignore_poke = 1;
2617 do_blank_screen(0);
2618 release_console_sem();
2619 break;
2620 case TIOCL_BLANKEDSCREEN:
2621 ret = console_blanked;
2622 break;
2623 default:
2624 ret = -EINVAL;
2625 break;
2626 }
2627 unlock_kernel();
2628 return ret;
2629 }
2630
2631 /*
2632 * /dev/ttyN handling
2633 */
2634
2635 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2636 {
2637 int retval;
2638
2639 retval = do_con_write(tty, buf, count);
2640 con_flush_chars(tty);
2641
2642 return retval;
2643 }
2644
2645 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2646 {
2647 if (in_interrupt())
2648 return 0; /* n_r3964 calls put_char() from interrupt context */
2649 return do_con_write(tty, &ch, 1);
2650 }
2651
2652 static int con_write_room(struct tty_struct *tty)
2653 {
2654 if (tty->stopped)
2655 return 0;
2656 return 4096; /* No limit, really; we're not buffering */
2657 }
2658
2659 static int con_chars_in_buffer(struct tty_struct *tty)
2660 {
2661 return 0; /* we're not buffering */
2662 }
2663
2664 /*
2665 * con_throttle and con_unthrottle are only used for
2666 * paste_selection(), which has to stuff in a large number of
2667 * characters...
2668 */
2669 static void con_throttle(struct tty_struct *tty)
2670 {
2671 }
2672
2673 static void con_unthrottle(struct tty_struct *tty)
2674 {
2675 struct vc_data *vc = tty->driver_data;
2676
2677 wake_up_interruptible(&vc->paste_wait);
2678 }
2679
2680 /*
2681 * Turn the Scroll-Lock LED on when the tty is stopped
2682 */
2683 static void con_stop(struct tty_struct *tty)
2684 {
2685 int console_num;
2686 if (!tty)
2687 return;
2688 console_num = tty->index;
2689 if (!vc_cons_allocated(console_num))
2690 return;
2691 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2692 set_leds();
2693 }
2694
2695 /*
2696 * Turn the Scroll-Lock LED off when the console is started
2697 */
2698 static void con_start(struct tty_struct *tty)
2699 {
2700 int console_num;
2701 if (!tty)
2702 return;
2703 console_num = tty->index;
2704 if (!vc_cons_allocated(console_num))
2705 return;
2706 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2707 set_leds();
2708 }
2709
2710 static void con_flush_chars(struct tty_struct *tty)
2711 {
2712 struct vc_data *vc;
2713
2714 if (in_interrupt()) /* from flush_to_ldisc */
2715 return;
2716
2717 /* if we race with con_close(), vt may be null */
2718 acquire_console_sem();
2719 vc = tty->driver_data;
2720 if (vc)
2721 set_cursor(vc);
2722 release_console_sem();
2723 }
2724
2725 /*
2726 * Allocate the console screen memory.
2727 */
2728 static int con_open(struct tty_struct *tty, struct file *filp)
2729 {
2730 unsigned int currcons = tty->index;
2731 int ret = 0;
2732
2733 acquire_console_sem();
2734 if (tty->driver_data == NULL) {
2735 ret = vc_allocate(currcons);
2736 if (ret == 0) {
2737 struct vc_data *vc = vc_cons[currcons].d;
2738 tty->driver_data = vc;
2739 vc->vc_tty = tty;
2740
2741 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2742 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2743 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2744 }
2745 release_console_sem();
2746 vcs_make_sysfs(tty);
2747 return ret;
2748 }
2749 }
2750 release_console_sem();
2751 return ret;
2752 }
2753
2754 /*
2755 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2756 * and taking a ref against the tty while we're in the process of forgetting
2757 * about it and cleaning things up.
2758 *
2759 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2760 */
2761 static void con_close(struct tty_struct *tty, struct file *filp)
2762 {
2763 mutex_lock(&tty_mutex);
2764 acquire_console_sem();
2765 if (tty && tty->count == 1) {
2766 struct vc_data *vc = tty->driver_data;
2767
2768 if (vc)
2769 vc->vc_tty = NULL;
2770 tty->driver_data = NULL;
2771 release_console_sem();
2772 vcs_remove_sysfs(tty);
2773 mutex_unlock(&tty_mutex);
2774 /*
2775 * tty_mutex is released, but we still hold BKL, so there is
2776 * still exclusion against init_dev()
2777 */
2778 return;
2779 }
2780 release_console_sem();
2781 mutex_unlock(&tty_mutex);
2782 }
2783
2784 static int default_italic_color = 2; // green (ASCII)
2785 static int default_underline_color = 3; // cyan (ASCII)
2786 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2787 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2788
2789 static void vc_init(struct vc_data *vc, unsigned int rows,
2790 unsigned int cols, int do_clear)
2791 {
2792 int j, k ;
2793
2794 vc->vc_cols = cols;
2795 vc->vc_rows = rows;
2796 vc->vc_size_row = cols << 1;
2797 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2798
2799 set_origin(vc);
2800 vc->vc_pos = vc->vc_origin;
2801 reset_vc(vc);
2802 for (j=k=0; j<16; j++) {
2803 vc->vc_palette[k++] = default_red[j] ;
2804 vc->vc_palette[k++] = default_grn[j] ;
2805 vc->vc_palette[k++] = default_blu[j] ;
2806 }
2807 vc->vc_def_color = 0x07; /* white */
2808 vc->vc_ulcolor = default_underline_color;
2809 vc->vc_itcolor = default_italic_color;
2810 vc->vc_halfcolor = 0x08; /* grey */
2811 init_waitqueue_head(&vc->paste_wait);
2812 reset_terminal(vc, do_clear);
2813 }
2814
2815 /*
2816 * This routine initializes console interrupts, and does nothing
2817 * else. If you want the screen to clear, call tty_write with
2818 * the appropriate escape-sequence.
2819 */
2820
2821 static int __init con_init(void)
2822 {
2823 const char *display_desc = NULL;
2824 struct vc_data *vc;
2825 unsigned int currcons = 0, i;
2826
2827 acquire_console_sem();
2828
2829 if (conswitchp)
2830 display_desc = conswitchp->con_startup();
2831 if (!display_desc) {
2832 fg_console = 0;
2833 release_console_sem();
2834 return 0;
2835 }
2836
2837 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2838 struct con_driver *con_driver = &registered_con_driver[i];
2839
2840 if (con_driver->con == NULL) {
2841 con_driver->con = conswitchp;
2842 con_driver->desc = display_desc;
2843 con_driver->flag = CON_DRIVER_FLAG_INIT;
2844 con_driver->first = 0;
2845 con_driver->last = MAX_NR_CONSOLES - 1;
2846 break;
2847 }
2848 }
2849
2850 for (i = 0; i < MAX_NR_CONSOLES; i++)
2851 con_driver_map[i] = conswitchp;
2852
2853 if (blankinterval) {
2854 blank_state = blank_normal_wait;
2855 mod_timer(&console_timer, jiffies + blankinterval);
2856 }
2857
2858 /*
2859 * kmalloc is not running yet - we use the bootmem allocator.
2860 */
2861 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2862 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2863 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2864 visual_init(vc, currcons, 1);
2865 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2866 vc->vc_kmalloced = 0;
2867 vc_init(vc, vc->vc_rows, vc->vc_cols,
2868 currcons || !vc->vc_sw->con_save_screen);
2869 }
2870 currcons = fg_console = 0;
2871 master_display_fg = vc = vc_cons[currcons].d;
2872 set_origin(vc);
2873 save_screen(vc);
2874 gotoxy(vc, vc->vc_x, vc->vc_y);
2875 csi_J(vc, 0);
2876 update_screen(vc);
2877 printk("Console: %s %s %dx%d",
2878 vc->vc_can_do_color ? "colour" : "mono",
2879 display_desc, vc->vc_cols, vc->vc_rows);
2880 printable = 1;
2881 printk("\n");
2882
2883 release_console_sem();
2884
2885 #ifdef CONFIG_VT_CONSOLE
2886 register_console(&vt_console_driver);
2887 #endif
2888 return 0;
2889 }
2890 console_initcall(con_init);
2891
2892 static const struct tty_operations con_ops = {
2893 .open = con_open,
2894 .close = con_close,
2895 .write = con_write,
2896 .write_room = con_write_room,
2897 .put_char = con_put_char,
2898 .flush_chars = con_flush_chars,
2899 .chars_in_buffer = con_chars_in_buffer,
2900 .ioctl = vt_ioctl,
2901 .stop = con_stop,
2902 .start = con_start,
2903 .throttle = con_throttle,
2904 .unthrottle = con_unthrottle,
2905 };
2906
2907 int __init vty_init(void)
2908 {
2909 vcs_init();
2910
2911 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2912 if (!console_driver)
2913 panic("Couldn't allocate console driver\n");
2914 console_driver->owner = THIS_MODULE;
2915 console_driver->name = "tty";
2916 console_driver->name_base = 1;
2917 console_driver->major = TTY_MAJOR;
2918 console_driver->minor_start = 1;
2919 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2920 console_driver->init_termios = tty_std_termios;
2921 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2922 tty_set_operations(console_driver, &con_ops);
2923 if (tty_register_driver(console_driver))
2924 panic("Couldn't register console driver\n");
2925
2926 kbd_init();
2927 console_map_init();
2928 #ifdef CONFIG_PROM_CONSOLE
2929 prom_con_init();
2930 #endif
2931 #ifdef CONFIG_MDA_CONSOLE
2932 mda_console_init();
2933 #endif
2934 return 0;
2935 }
2936
2937 #ifndef VT_SINGLE_DRIVER
2938 #include <linux/device.h>
2939
2940 static struct class *vtconsole_class;
2941
2942 static int bind_con_driver(const struct consw *csw, int first, int last,
2943 int deflt)
2944 {
2945 struct module *owner = csw->owner;
2946 const char *desc = NULL;
2947 struct con_driver *con_driver;
2948 int i, j = -1, k = -1, retval = -ENODEV;
2949
2950 if (!try_module_get(owner))
2951 return -ENODEV;
2952
2953 acquire_console_sem();
2954
2955 /* check if driver is registered */
2956 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2957 con_driver = &registered_con_driver[i];
2958
2959 if (con_driver->con == csw) {
2960 desc = con_driver->desc;
2961 retval = 0;
2962 break;
2963 }
2964 }
2965
2966 if (retval)
2967 goto err;
2968
2969 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2970 csw->con_startup();
2971 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2972 }
2973
2974 if (deflt) {
2975 if (conswitchp)
2976 module_put(conswitchp->owner);
2977
2978 __module_get(owner);
2979 conswitchp = csw;
2980 }
2981
2982 first = max(first, con_driver->first);
2983 last = min(last, con_driver->last);
2984
2985 for (i = first; i <= last; i++) {
2986 int old_was_color;
2987 struct vc_data *vc = vc_cons[i].d;
2988
2989 if (con_driver_map[i])
2990 module_put(con_driver_map[i]->owner);
2991 __module_get(owner);
2992 con_driver_map[i] = csw;
2993
2994 if (!vc || !vc->vc_sw)
2995 continue;
2996
2997 j = i;
2998
2999 if (CON_IS_VISIBLE(vc)) {
3000 k = i;
3001 save_screen(vc);
3002 }
3003
3004 old_was_color = vc->vc_can_do_color;
3005 vc->vc_sw->con_deinit(vc);
3006 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3007 visual_init(vc, i, 0);
3008 set_origin(vc);
3009 update_attr(vc);
3010
3011 /* If the console changed between mono <-> color, then
3012 * the attributes in the screenbuf will be wrong. The
3013 * following resets all attributes to something sane.
3014 */
3015 if (old_was_color != vc->vc_can_do_color)
3016 clear_buffer_attributes(vc);
3017 }
3018
3019 printk("Console: switching ");
3020 if (!deflt)
3021 printk("consoles %d-%d ", first+1, last+1);
3022 if (j >= 0) {
3023 struct vc_data *vc = vc_cons[j].d;
3024
3025 printk("to %s %s %dx%d\n",
3026 vc->vc_can_do_color ? "colour" : "mono",
3027 desc, vc->vc_cols, vc->vc_rows);
3028
3029 if (k >= 0) {
3030 vc = vc_cons[k].d;
3031 update_screen(vc);
3032 }
3033 } else
3034 printk("to %s\n", desc);
3035
3036 retval = 0;
3037 err:
3038 release_console_sem();
3039 module_put(owner);
3040 return retval;
3041 };
3042
3043 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3044 static int con_is_graphics(const struct consw *csw, int first, int last)
3045 {
3046 int i, retval = 0;
3047
3048 for (i = first; i <= last; i++) {
3049 struct vc_data *vc = vc_cons[i].d;
3050
3051 if (vc && vc->vc_mode == KD_GRAPHICS) {
3052 retval = 1;
3053 break;
3054 }
3055 }
3056
3057 return retval;
3058 }
3059
3060 /**
3061 * unbind_con_driver - unbind a console driver
3062 * @csw: pointer to console driver to unregister
3063 * @first: first in range of consoles that @csw should be unbound from
3064 * @last: last in range of consoles that @csw should be unbound from
3065 * @deflt: should next bound console driver be default after @csw is unbound?
3066 *
3067 * To unbind a driver from all possible consoles, pass 0 as @first and
3068 * %MAX_NR_CONSOLES as @last.
3069 *
3070 * @deflt controls whether the console that ends up replacing @csw should be
3071 * the default console.
3072 *
3073 * RETURNS:
3074 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3075 * or 0 on success.
3076 */
3077 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3078 {
3079 struct module *owner = csw->owner;
3080 const struct consw *defcsw = NULL;
3081 struct con_driver *con_driver = NULL, *con_back = NULL;
3082 int i, retval = -ENODEV;
3083
3084 if (!try_module_get(owner))
3085 return -ENODEV;
3086
3087 acquire_console_sem();
3088
3089 /* check if driver is registered and if it is unbindable */
3090 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3091 con_driver = &registered_con_driver[i];
3092
3093 if (con_driver->con == csw &&
3094 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3095 retval = 0;
3096 break;
3097 }
3098 }
3099
3100 if (retval) {
3101 release_console_sem();
3102 goto err;
3103 }
3104
3105 retval = -ENODEV;
3106
3107 /* check if backup driver exists */
3108 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3109 con_back = &registered_con_driver[i];
3110
3111 if (con_back->con &&
3112 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3113 defcsw = con_back->con;
3114 retval = 0;
3115 break;
3116 }
3117 }
3118
3119 if (retval) {
3120 release_console_sem();
3121 goto err;
3122 }
3123
3124 if (!con_is_bound(csw)) {
3125 release_console_sem();
3126 goto err;
3127 }
3128
3129 first = max(first, con_driver->first);
3130 last = min(last, con_driver->last);
3131
3132 for (i = first; i <= last; i++) {
3133 if (con_driver_map[i] == csw) {
3134 module_put(csw->owner);
3135 con_driver_map[i] = NULL;
3136 }
3137 }
3138
3139 if (!con_is_bound(defcsw)) {
3140 const struct consw *defconsw = conswitchp;
3141
3142 defcsw->con_startup();
3143 con_back->flag |= CON_DRIVER_FLAG_INIT;
3144 /*
3145 * vgacon may change the default driver to point
3146 * to dummycon, we restore it here...
3147 */
3148 conswitchp = defconsw;
3149 }
3150
3151 if (!con_is_bound(csw))
3152 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3153
3154 release_console_sem();
3155 /* ignore return value, binding should not fail */
3156 bind_con_driver(defcsw, first, last, deflt);
3157 err:
3158 module_put(owner);
3159 return retval;
3160
3161 }
3162 EXPORT_SYMBOL(unbind_con_driver);
3163
3164 static int vt_bind(struct con_driver *con)
3165 {
3166 const struct consw *defcsw = NULL, *csw = NULL;
3167 int i, more = 1, first = -1, last = -1, deflt = 0;
3168
3169 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3170 con_is_graphics(con->con, con->first, con->last))
3171 goto err;
3172
3173 csw = con->con;
3174
3175 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3176 struct con_driver *con = &registered_con_driver[i];
3177
3178 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3179 defcsw = con->con;
3180 break;
3181 }
3182 }
3183
3184 if (!defcsw)
3185 goto err;
3186
3187 while (more) {
3188 more = 0;
3189
3190 for (i = con->first; i <= con->last; i++) {
3191 if (con_driver_map[i] == defcsw) {
3192 if (first == -1)
3193 first = i;
3194 last = i;
3195 more = 1;
3196 } else if (first != -1)
3197 break;
3198 }
3199
3200 if (first == 0 && last == MAX_NR_CONSOLES -1)
3201 deflt = 1;
3202
3203 if (first != -1)
3204 bind_con_driver(csw, first, last, deflt);
3205
3206 first = -1;
3207 last = -1;
3208 deflt = 0;
3209 }
3210
3211 err:
3212 return 0;
3213 }
3214
3215 static int vt_unbind(struct con_driver *con)
3216 {
3217 const struct consw *csw = NULL;
3218 int i, more = 1, first = -1, last = -1, deflt = 0;
3219
3220 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3221 con_is_graphics(con->con, con->first, con->last))
3222 goto err;
3223
3224 csw = con->con;
3225
3226 while (more) {
3227 more = 0;
3228
3229 for (i = con->first; i <= con->last; i++) {
3230 if (con_driver_map[i] == csw) {
3231 if (first == -1)
3232 first = i;
3233 last = i;
3234 more = 1;
3235 } else if (first != -1)
3236 break;
3237 }
3238
3239 if (first == 0 && last == MAX_NR_CONSOLES -1)
3240 deflt = 1;
3241
3242 if (first != -1)
3243 unbind_con_driver(csw, first, last, deflt);
3244
3245 first = -1;
3246 last = -1;
3247 deflt = 0;
3248 }
3249
3250 err:
3251 return 0;
3252 }
3253 #else
3254 static inline int vt_bind(struct con_driver *con)
3255 {
3256 return 0;
3257 }
3258 static inline int vt_unbind(struct con_driver *con)
3259 {
3260 return 0;
3261 }
3262 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3263
3264 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3265 const char *buf, size_t count)
3266 {
3267 struct con_driver *con = dev_get_drvdata(dev);
3268 int bind = simple_strtoul(buf, NULL, 0);
3269
3270 if (bind)
3271 vt_bind(con);
3272 else
3273 vt_unbind(con);
3274
3275 return count;
3276 }
3277
3278 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3279 char *buf)
3280 {
3281 struct con_driver *con = dev_get_drvdata(dev);
3282 int bind = con_is_bound(con->con);
3283
3284 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3285 }
3286
3287 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3288 char *buf)
3289 {
3290 struct con_driver *con = dev_get_drvdata(dev);
3291
3292 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3293 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3294 con->desc);
3295
3296 }
3297
3298 static struct device_attribute device_attrs[] = {
3299 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3300 __ATTR(name, S_IRUGO, show_name, NULL),
3301 };
3302
3303 static int vtconsole_init_device(struct con_driver *con)
3304 {
3305 int i;
3306 int error = 0;
3307
3308 con->flag |= CON_DRIVER_FLAG_ATTR;
3309 dev_set_drvdata(con->dev, con);
3310 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3311 error = device_create_file(con->dev, &device_attrs[i]);
3312 if (error)
3313 break;
3314 }
3315
3316 if (error) {
3317 while (--i >= 0)
3318 device_remove_file(con->dev, &device_attrs[i]);
3319 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3320 }
3321
3322 return error;
3323 }
3324
3325 static void vtconsole_deinit_device(struct con_driver *con)
3326 {
3327 int i;
3328
3329 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3330 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3331 device_remove_file(con->dev, &device_attrs[i]);
3332 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3333 }
3334 }
3335
3336 /**
3337 * con_is_bound - checks if driver is bound to the console
3338 * @csw: console driver
3339 *
3340 * RETURNS: zero if unbound, nonzero if bound
3341 *
3342 * Drivers can call this and if zero, they should release
3343 * all resources allocated on con_startup()
3344 */
3345 int con_is_bound(const struct consw *csw)
3346 {
3347 int i, bound = 0;
3348
3349 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3350 if (con_driver_map[i] == csw) {
3351 bound = 1;
3352 break;
3353 }
3354 }
3355
3356 return bound;
3357 }
3358 EXPORT_SYMBOL(con_is_bound);
3359
3360 /**
3361 * register_con_driver - register console driver to console layer
3362 * @csw: console driver
3363 * @first: the first console to take over, minimum value is 0
3364 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3365 *
3366 * DESCRIPTION: This function registers a console driver which can later
3367 * bind to a range of consoles specified by @first and @last. It will
3368 * also initialize the console driver by calling con_startup().
3369 */
3370 int register_con_driver(const struct consw *csw, int first, int last)
3371 {
3372 struct module *owner = csw->owner;
3373 struct con_driver *con_driver;
3374 const char *desc;
3375 int i, retval = 0;
3376
3377 if (!try_module_get(owner))
3378 return -ENODEV;
3379
3380 acquire_console_sem();
3381
3382 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3383 con_driver = &registered_con_driver[i];
3384
3385 /* already registered */
3386 if (con_driver->con == csw)
3387 retval = -EINVAL;
3388 }
3389
3390 if (retval)
3391 goto err;
3392
3393 desc = csw->con_startup();
3394
3395 if (!desc)
3396 goto err;
3397
3398 retval = -EINVAL;
3399
3400 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3401 con_driver = &registered_con_driver[i];
3402
3403 if (con_driver->con == NULL) {
3404 con_driver->con = csw;
3405 con_driver->desc = desc;
3406 con_driver->node = i;
3407 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3408 CON_DRIVER_FLAG_INIT;
3409 con_driver->first = first;
3410 con_driver->last = last;
3411 retval = 0;
3412 break;
3413 }
3414 }
3415
3416 if (retval)
3417 goto err;
3418
3419 con_driver->dev = device_create(vtconsole_class, NULL,
3420 MKDEV(0, con_driver->node),
3421 "vtcon%i", con_driver->node);
3422
3423 if (IS_ERR(con_driver->dev)) {
3424 printk(KERN_WARNING "Unable to create device for %s; "
3425 "errno = %ld\n", con_driver->desc,
3426 PTR_ERR(con_driver->dev));
3427 con_driver->dev = NULL;
3428 } else {
3429 vtconsole_init_device(con_driver);
3430 }
3431
3432 err:
3433 release_console_sem();
3434 module_put(owner);
3435 return retval;
3436 }
3437 EXPORT_SYMBOL(register_con_driver);
3438
3439 /**
3440 * unregister_con_driver - unregister console driver from console layer
3441 * @csw: console driver
3442 *
3443 * DESCRIPTION: All drivers that registers to the console layer must
3444 * call this function upon exit, or if the console driver is in a state
3445 * where it won't be able to handle console services, such as the
3446 * framebuffer console without loaded framebuffer drivers.
3447 *
3448 * The driver must unbind first prior to unregistration.
3449 */
3450 int unregister_con_driver(const struct consw *csw)
3451 {
3452 int i, retval = -ENODEV;
3453
3454 acquire_console_sem();
3455
3456 /* cannot unregister a bound driver */
3457 if (con_is_bound(csw))
3458 goto err;
3459
3460 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3461 struct con_driver *con_driver = &registered_con_driver[i];
3462
3463 if (con_driver->con == csw &&
3464 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3465 vtconsole_deinit_device(con_driver);
3466 device_destroy(vtconsole_class,
3467 MKDEV(0, con_driver->node));
3468 con_driver->con = NULL;
3469 con_driver->desc = NULL;
3470 con_driver->dev = NULL;
3471 con_driver->node = 0;
3472 con_driver->flag = 0;
3473 con_driver->first = 0;
3474 con_driver->last = 0;
3475 retval = 0;
3476 break;
3477 }
3478 }
3479 err:
3480 release_console_sem();
3481 return retval;
3482 }
3483 EXPORT_SYMBOL(unregister_con_driver);
3484
3485 /*
3486 * If we support more console drivers, this function is used
3487 * when a driver wants to take over some existing consoles
3488 * and become default driver for newly opened ones.
3489 *
3490 * take_over_console is basically a register followed by unbind
3491 */
3492 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3493 {
3494 int err;
3495
3496 err = register_con_driver(csw, first, last);
3497
3498 if (!err)
3499 bind_con_driver(csw, first, last, deflt);
3500
3501 return err;
3502 }
3503
3504 /*
3505 * give_up_console is a wrapper to unregister_con_driver. It will only
3506 * work if driver is fully unbound.
3507 */
3508 void give_up_console(const struct consw *csw)
3509 {
3510 unregister_con_driver(csw);
3511 }
3512
3513 static int __init vtconsole_class_init(void)
3514 {
3515 int i;
3516
3517 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3518 if (IS_ERR(vtconsole_class)) {
3519 printk(KERN_WARNING "Unable to create vt console class; "
3520 "errno = %ld\n", PTR_ERR(vtconsole_class));
3521 vtconsole_class = NULL;
3522 }
3523
3524 /* Add system drivers to sysfs */
3525 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3526 struct con_driver *con = &registered_con_driver[i];
3527
3528 if (con->con && !con->dev) {
3529 con->dev = device_create(vtconsole_class, NULL,
3530 MKDEV(0, con->node),
3531 "vtcon%i", con->node);
3532
3533 if (IS_ERR(con->dev)) {
3534 printk(KERN_WARNING "Unable to create "
3535 "device for %s; errno = %ld\n",
3536 con->desc, PTR_ERR(con->dev));
3537 con->dev = NULL;
3538 } else {
3539 vtconsole_init_device(con);
3540 }
3541 }
3542 }
3543
3544 return 0;
3545 }
3546 postcore_initcall(vtconsole_class_init);
3547
3548 #endif
3549
3550 /*
3551 * Screen blanking
3552 */
3553
3554 static int set_vesa_blanking(char __user *p)
3555 {
3556 unsigned int mode;
3557
3558 if (get_user(mode, p + 1))
3559 return -EFAULT;
3560
3561 vesa_blank_mode = (mode < 4) ? mode : 0;
3562 return 0;
3563 }
3564
3565 void do_blank_screen(int entering_gfx)
3566 {
3567 struct vc_data *vc = vc_cons[fg_console].d;
3568 int i;
3569
3570 WARN_CONSOLE_UNLOCKED();
3571
3572 if (console_blanked) {
3573 if (blank_state == blank_vesa_wait) {
3574 blank_state = blank_off;
3575 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3576 }
3577 return;
3578 }
3579
3580 /* entering graphics mode? */
3581 if (entering_gfx) {
3582 hide_cursor(vc);
3583 save_screen(vc);
3584 vc->vc_sw->con_blank(vc, -1, 1);
3585 console_blanked = fg_console + 1;
3586 blank_state = blank_off;
3587 set_origin(vc);
3588 return;
3589 }
3590
3591 if (blank_state != blank_normal_wait)
3592 return;
3593 blank_state = blank_off;
3594
3595 /* don't blank graphics */
3596 if (vc->vc_mode != KD_TEXT) {
3597 console_blanked = fg_console + 1;
3598 return;
3599 }
3600
3601 hide_cursor(vc);
3602 del_timer_sync(&console_timer);
3603 blank_timer_expired = 0;
3604
3605 save_screen(vc);
3606 /* In case we need to reset origin, blanking hook returns 1 */
3607 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3608 console_blanked = fg_console + 1;
3609 if (i)
3610 set_origin(vc);
3611
3612 if (console_blank_hook && console_blank_hook(1))
3613 return;
3614
3615 if (vesa_off_interval && vesa_blank_mode) {
3616 blank_state = blank_vesa_wait;
3617 mod_timer(&console_timer, jiffies + vesa_off_interval);
3618 }
3619 }
3620 EXPORT_SYMBOL(do_blank_screen);
3621
3622 /*
3623 * Called by timer as well as from vt_console_driver
3624 */
3625 void do_unblank_screen(int leaving_gfx)
3626 {
3627 struct vc_data *vc;
3628
3629 /* This should now always be called from a "sane" (read: can schedule)
3630 * context for the sake of the low level drivers, except in the special
3631 * case of oops_in_progress
3632 */
3633 if (!oops_in_progress)
3634 might_sleep();
3635
3636 WARN_CONSOLE_UNLOCKED();
3637
3638 ignore_poke = 0;
3639 if (!console_blanked)
3640 return;
3641 if (!vc_cons_allocated(fg_console)) {
3642 /* impossible */
3643 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3644 return;
3645 }
3646 vc = vc_cons[fg_console].d;
3647 if (vc->vc_mode != KD_TEXT)
3648 return; /* but leave console_blanked != 0 */
3649
3650 if (blankinterval) {
3651 mod_timer(&console_timer, jiffies + blankinterval);
3652 blank_state = blank_normal_wait;
3653 }
3654
3655 console_blanked = 0;
3656 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3657 /* Low-level driver cannot restore -> do it ourselves */
3658 update_screen(vc);
3659 if (console_blank_hook)
3660 console_blank_hook(0);
3661 set_palette(vc);
3662 set_cursor(vc);
3663 }
3664 EXPORT_SYMBOL(do_unblank_screen);
3665
3666 /*
3667 * This is called by the outside world to cause a forced unblank, mostly for
3668 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3669 * call it with 1 as an argument and so force a mode restore... that may kill
3670 * X or at least garbage the screen but would also make the Oops visible...
3671 */
3672 void unblank_screen(void)
3673 {
3674 do_unblank_screen(0);
3675 }
3676
3677 /*
3678 * We defer the timer blanking to work queue so it can take the console mutex
3679 * (console operations can still happen at irq time, but only from printk which
3680 * has the console mutex. Not perfect yet, but better than no locking
3681 */
3682 static void blank_screen_t(unsigned long dummy)
3683 {
3684 if (unlikely(!keventd_up())) {
3685 mod_timer(&console_timer, jiffies + blankinterval);
3686 return;
3687 }
3688 blank_timer_expired = 1;
3689 schedule_work(&console_work);
3690 }
3691
3692 void poke_blanked_console(void)
3693 {
3694 WARN_CONSOLE_UNLOCKED();
3695
3696 /* Add this so we quickly catch whoever might call us in a non
3697 * safe context. Nowadays, unblank_screen() isn't to be called in
3698 * atomic contexts and is allowed to schedule (with the special case
3699 * of oops_in_progress, but that isn't of any concern for this
3700 * function. --BenH.
3701 */
3702 might_sleep();
3703
3704 /* This isn't perfectly race free, but a race here would be mostly harmless,
3705 * at worse, we'll do a spurrious blank and it's unlikely
3706 */
3707 del_timer(&console_timer);
3708 blank_timer_expired = 0;
3709
3710 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3711 return;
3712 if (console_blanked)
3713 unblank_screen();
3714 else if (blankinterval) {
3715 mod_timer(&console_timer, jiffies + blankinterval);
3716 blank_state = blank_normal_wait;
3717 }
3718 }
3719
3720 /*
3721 * Palettes
3722 */
3723
3724 static void set_palette(struct vc_data *vc)
3725 {
3726 WARN_CONSOLE_UNLOCKED();
3727
3728 if (vc->vc_mode != KD_GRAPHICS)
3729 vc->vc_sw->con_set_palette(vc, color_table);
3730 }
3731
3732 static int set_get_cmap(unsigned char __user *arg, int set)
3733 {
3734 int i, j, k;
3735
3736 WARN_CONSOLE_UNLOCKED();
3737
3738 for (i = 0; i < 16; i++)
3739 if (set) {
3740 get_user(default_red[i], arg++);
3741 get_user(default_grn[i], arg++);
3742 get_user(default_blu[i], arg++);
3743 } else {
3744 put_user(default_red[i], arg++);
3745 put_user(default_grn[i], arg++);
3746 put_user(default_blu[i], arg++);
3747 }
3748 if (set) {
3749 for (i = 0; i < MAX_NR_CONSOLES; i++)
3750 if (vc_cons_allocated(i)) {
3751 for (j = k = 0; j < 16; j++) {
3752 vc_cons[i].d->vc_palette[k++] = default_red[j];
3753 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3754 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3755 }
3756 set_palette(vc_cons[i].d);
3757 }
3758 }
3759 return 0;
3760 }
3761
3762 /*
3763 * Load palette into the DAC registers. arg points to a colour
3764 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3765 */
3766
3767 int con_set_cmap(unsigned char __user *arg)
3768 {
3769 int rc;
3770
3771 acquire_console_sem();
3772 rc = set_get_cmap (arg,1);
3773 release_console_sem();
3774
3775 return rc;
3776 }
3777
3778 int con_get_cmap(unsigned char __user *arg)
3779 {
3780 int rc;
3781
3782 acquire_console_sem();
3783 rc = set_get_cmap (arg,0);
3784 release_console_sem();
3785
3786 return rc;
3787 }
3788
3789 void reset_palette(struct vc_data *vc)
3790 {
3791 int j, k;
3792 for (j=k=0; j<16; j++) {
3793 vc->vc_palette[k++] = default_red[j];
3794 vc->vc_palette[k++] = default_grn[j];
3795 vc->vc_palette[k++] = default_blu[j];
3796 }
3797 set_palette(vc);
3798 }
3799
3800 /*
3801 * Font switching
3802 *
3803 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3804 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3805 * depending on width) reserved for each character which is kinda wasty, but
3806 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3807 * is upto the actual low-level console-driver convert data into its favorite
3808 * format (maybe we should add a `fontoffset' field to the `display'
3809 * structure so we won't have to convert the fontdata all the time.
3810 * /Jes
3811 */
3812
3813 #define max_font_size 65536
3814
3815 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3816 {
3817 struct console_font font;
3818 int rc = -EINVAL;
3819 int c;
3820
3821 if (vc->vc_mode != KD_TEXT)
3822 return -EINVAL;
3823
3824 if (op->data) {
3825 font.data = kmalloc(max_font_size, GFP_KERNEL);
3826 if (!font.data)
3827 return -ENOMEM;
3828 } else
3829 font.data = NULL;
3830
3831 acquire_console_sem();
3832 if (vc->vc_sw->con_font_get)
3833 rc = vc->vc_sw->con_font_get(vc, &font);
3834 else
3835 rc = -ENOSYS;
3836 release_console_sem();
3837
3838 if (rc)
3839 goto out;
3840
3841 c = (font.width+7)/8 * 32 * font.charcount;
3842
3843 if (op->data && font.charcount > op->charcount)
3844 rc = -ENOSPC;
3845 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3846 if (font.width > op->width || font.height > op->height)
3847 rc = -ENOSPC;
3848 } else {
3849 if (font.width != 8)
3850 rc = -EIO;
3851 else if ((op->height && font.height > op->height) ||
3852 font.height > 32)
3853 rc = -ENOSPC;
3854 }
3855 if (rc)
3856 goto out;
3857
3858 op->height = font.height;
3859 op->width = font.width;
3860 op->charcount = font.charcount;
3861
3862 if (op->data && copy_to_user(op->data, font.data, c))
3863 rc = -EFAULT;
3864
3865 out:
3866 kfree(font.data);
3867 return rc;
3868 }
3869
3870 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3871 {
3872 struct console_font font;
3873 int rc = -EINVAL;
3874 int size;
3875
3876 if (vc->vc_mode != KD_TEXT)
3877 return -EINVAL;
3878 if (!op->data)
3879 return -EINVAL;
3880 if (op->charcount > 512)
3881 return -EINVAL;
3882 if (!op->height) { /* Need to guess font height [compat] */
3883 int h, i;
3884 u8 __user *charmap = op->data;
3885 u8 tmp;
3886
3887 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3888 so that we can get rid of this soon */
3889 if (!(op->flags & KD_FONT_FLAG_OLD))
3890 return -EINVAL;
3891 for (h = 32; h > 0; h--)
3892 for (i = 0; i < op->charcount; i++) {
3893 if (get_user(tmp, &charmap[32*i+h-1]))
3894 return -EFAULT;
3895 if (tmp)
3896 goto nonzero;
3897 }
3898 return -EINVAL;
3899 nonzero:
3900 op->height = h;
3901 }
3902 if (op->width <= 0 || op->width > 32 || op->height > 32)
3903 return -EINVAL;
3904 size = (op->width+7)/8 * 32 * op->charcount;
3905 if (size > max_font_size)
3906 return -ENOSPC;
3907 font.charcount = op->charcount;
3908 font.height = op->height;
3909 font.width = op->width;
3910 font.data = kmalloc(size, GFP_KERNEL);
3911 if (!font.data)
3912 return -ENOMEM;
3913 if (copy_from_user(font.data, op->data, size)) {
3914 kfree(font.data);
3915 return -EFAULT;
3916 }
3917 acquire_console_sem();
3918 if (vc->vc_sw->con_font_set)
3919 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3920 else
3921 rc = -ENOSYS;
3922 release_console_sem();
3923 kfree(font.data);
3924 return rc;
3925 }
3926
3927 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3928 {
3929 struct console_font font = {.width = op->width, .height = op->height};
3930 char name[MAX_FONT_NAME];
3931 char *s = name;
3932 int rc;
3933
3934 if (vc->vc_mode != KD_TEXT)
3935 return -EINVAL;
3936
3937 if (!op->data)
3938 s = NULL;
3939 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3940 return -EFAULT;
3941 else
3942 name[MAX_FONT_NAME - 1] = 0;
3943
3944 acquire_console_sem();
3945 if (vc->vc_sw->con_font_default)
3946 rc = vc->vc_sw->con_font_default(vc, &font, s);
3947 else
3948 rc = -ENOSYS;
3949 release_console_sem();
3950 if (!rc) {
3951 op->width = font.width;
3952 op->height = font.height;
3953 }
3954 return rc;
3955 }
3956
3957 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3958 {
3959 int con = op->height;
3960 int rc;
3961
3962 if (vc->vc_mode != KD_TEXT)
3963 return -EINVAL;
3964
3965 acquire_console_sem();
3966 if (!vc->vc_sw->con_font_copy)
3967 rc = -ENOSYS;
3968 else if (con < 0 || !vc_cons_allocated(con))
3969 rc = -ENOTTY;
3970 else if (con == vc->vc_num) /* nothing to do */
3971 rc = 0;
3972 else
3973 rc = vc->vc_sw->con_font_copy(vc, con);
3974 release_console_sem();
3975 return rc;
3976 }
3977
3978 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3979 {
3980 switch (op->op) {
3981 case KD_FONT_OP_SET:
3982 return con_font_set(vc, op);
3983 case KD_FONT_OP_GET:
3984 return con_font_get(vc, op);
3985 case KD_FONT_OP_SET_DEFAULT:
3986 return con_font_default(vc, op);
3987 case KD_FONT_OP_COPY:
3988 return con_font_copy(vc, op);
3989 }
3990 return -ENOSYS;
3991 }
3992
3993 /*
3994 * Interface exported to selection and vcs.
3995 */
3996
3997 /* used by selection */
3998 u16 screen_glyph(struct vc_data *vc, int offset)
3999 {
4000 u16 w = scr_readw(screenpos(vc, offset, 1));
4001 u16 c = w & 0xff;
4002
4003 if (w & vc->vc_hi_font_mask)
4004 c |= 0x100;
4005 return c;
4006 }
4007 EXPORT_SYMBOL_GPL(screen_glyph);
4008
4009 /* used by vcs - note the word offset */
4010 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4011 {
4012 return screenpos(vc, 2 * w_offset, viewed);
4013 }
4014
4015 void getconsxy(struct vc_data *vc, unsigned char *p)
4016 {
4017 p[0] = vc->vc_x;
4018 p[1] = vc->vc_y;
4019 }
4020
4021 void putconsxy(struct vc_data *vc, unsigned char *p)
4022 {
4023 hide_cursor(vc);
4024 gotoxy(vc, p[0], p[1]);
4025 set_cursor(vc);
4026 }
4027
4028 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4029 {
4030 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4031 return softcursor_original;
4032 return scr_readw(org);
4033 }
4034
4035 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4036 {
4037 scr_writew(val, org);
4038 if ((unsigned long)org == vc->vc_pos) {
4039 softcursor_original = -1;
4040 add_softcursor(vc);
4041 }
4042 }
4043
4044 /*
4045 * Visible symbols for modules
4046 */
4047
4048 EXPORT_SYMBOL(color_table);
4049 EXPORT_SYMBOL(default_red);
4050 EXPORT_SYMBOL(default_grn);
4051 EXPORT_SYMBOL(default_blu);
4052 EXPORT_SYMBOL(update_region);
4053 EXPORT_SYMBOL(redraw_screen);
4054 EXPORT_SYMBOL(vc_resize);
4055 EXPORT_SYMBOL(vc_lock_resize);
4056 EXPORT_SYMBOL(fg_console);
4057 EXPORT_SYMBOL(console_blank_hook);
4058 EXPORT_SYMBOL(console_blanked);
4059 EXPORT_SYMBOL(vc_cons);
4060 #ifndef VT_SINGLE_DRIVER
4061 EXPORT_SYMBOL(take_over_console);
4062 EXPORT_SYMBOL(give_up_console);
4063 #endif
A Kernel for the Dreambox dm7025.