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semaphore: __down_common: use signal_pending_state()
[linux-2.6/mini2440.git] / drivers / char / vt.c
blob1bc00c9d860d70f917f2d945162aad3755b31749
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) && !console_blanked)
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, vc->vc_decscnm, 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 struct pid *pgrp = NULL;
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 spin_lock_irq(&vc->vc_tty->ctrl_lock);
920 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col))
921 pgrp = get_pid(vc->vc_tty->pgrp);
922 spin_unlock_irq(&vc->vc_tty->ctrl_lock);
923 if (pgrp) {
924 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
925 put_pid(pgrp);
926 }
927 *cws = ws;
928 }
929
930 if (CON_IS_VISIBLE(vc))
931 update_screen(vc);
932 return err;
933 }
934
935 int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
936 {
937 int rc;
938
939 acquire_console_sem();
940 rc = vc_resize(vc, cols, lines);
941 release_console_sem();
942 return rc;
943 }
944
945 void vc_deallocate(unsigned int currcons)
946 {
947 WARN_CONSOLE_UNLOCKED();
948
949 if (vc_cons_allocated(currcons)) {
950 struct vc_data *vc = vc_cons[currcons].d;
951 struct vt_notifier_param param = { .vc = vc };
952 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
953 vc->vc_sw->con_deinit(vc);
954 put_pid(vc->vt_pid);
955 module_put(vc->vc_sw->owner);
956 if (vc->vc_kmalloced)
957 kfree(vc->vc_screenbuf);
958 if (currcons >= MIN_NR_CONSOLES)
959 kfree(vc);
960 vc_cons[currcons].d = NULL;
961 }
962 }
963
964 /*
965 * VT102 emulator
966 */
967
968 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
969 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
970 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
971
972 #define decarm VC_REPEAT
973 #define decckm VC_CKMODE
974 #define kbdapplic VC_APPLIC
975 #define lnm VC_CRLF
976
977 /*
978 * this is what the terminal answers to a ESC-Z or csi0c query.
979 */
980 #define VT100ID "\033[?1;2c"
981 #define VT102ID "\033[?6c"
982
983 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
984 8,12,10,14, 9,13,11,15 };
985
986 /* the default colour table, for VGA+ colour systems */
987 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
988 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
989 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
990 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
991 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
992 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
993
994 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
995 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
996 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
997
998 /*
999 * gotoxy() must verify all boundaries, because the arguments
1000 * might also be negative. If the given position is out of
1001 * bounds, the cursor is placed at the nearest margin.
1002 */
1003 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1004 {
1005 int min_y, max_y;
1006
1007 if (new_x < 0)
1008 vc->vc_x = 0;
1009 else {
1010 if (new_x >= vc->vc_cols)
1011 vc->vc_x = vc->vc_cols - 1;
1012 else
1013 vc->vc_x = new_x;
1014 }
1015
1016 if (vc->vc_decom) {
1017 min_y = vc->vc_top;
1018 max_y = vc->vc_bottom;
1019 } else {
1020 min_y = 0;
1021 max_y = vc->vc_rows;
1022 }
1023 if (new_y < min_y)
1024 vc->vc_y = min_y;
1025 else if (new_y >= max_y)
1026 vc->vc_y = max_y - 1;
1027 else
1028 vc->vc_y = new_y;
1029 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1030 vc->vc_need_wrap = 0;
1031 }
1032
1033 /* for absolute user moves, when decom is set */
1034 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1035 {
1036 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1037 }
1038
1039 void scrollback(struct vc_data *vc, int lines)
1040 {
1041 if (!lines)
1042 lines = vc->vc_rows / 2;
1043 scrolldelta(-lines);
1044 }
1045
1046 void scrollfront(struct vc_data *vc, int lines)
1047 {
1048 if (!lines)
1049 lines = vc->vc_rows / 2;
1050 scrolldelta(lines);
1051 }
1052
1053 static void lf(struct vc_data *vc)
1054 {
1055 /* don't scroll if above bottom of scrolling region, or
1056 * if below scrolling region
1057 */
1058 if (vc->vc_y + 1 == vc->vc_bottom)
1059 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1060 else if (vc->vc_y < vc->vc_rows - 1) {
1061 vc->vc_y++;
1062 vc->vc_pos += vc->vc_size_row;
1063 }
1064 vc->vc_need_wrap = 0;
1065 notify_write(vc, '\n');
1066 }
1067
1068 static void ri(struct vc_data *vc)
1069 {
1070 /* don't scroll if below top of scrolling region, or
1071 * if above scrolling region
1072 */
1073 if (vc->vc_y == vc->vc_top)
1074 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1075 else if (vc->vc_y > 0) {
1076 vc->vc_y--;
1077 vc->vc_pos -= vc->vc_size_row;
1078 }
1079 vc->vc_need_wrap = 0;
1080 }
1081
1082 static inline void cr(struct vc_data *vc)
1083 {
1084 vc->vc_pos -= vc->vc_x << 1;
1085 vc->vc_need_wrap = vc->vc_x = 0;
1086 notify_write(vc, '\r');
1087 }
1088
1089 static inline void bs(struct vc_data *vc)
1090 {
1091 if (vc->vc_x) {
1092 vc->vc_pos -= 2;
1093 vc->vc_x--;
1094 vc->vc_need_wrap = 0;
1095 notify_write(vc, '\b');
1096 }
1097 }
1098
1099 static inline void del(struct vc_data *vc)
1100 {
1101 /* ignored */
1102 }
1103
1104 static void csi_J(struct vc_data *vc, int vpar)
1105 {
1106 unsigned int count;
1107 unsigned short * start;
1108
1109 switch (vpar) {
1110 case 0: /* erase from cursor to end of display */
1111 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1112 start = (unsigned short *)vc->vc_pos;
1113 if (DO_UPDATE(vc)) {
1114 /* do in two stages */
1115 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1116 vc->vc_cols - vc->vc_x);
1117 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1118 vc->vc_rows - vc->vc_y - 1,
1119 vc->vc_cols);
1120 }
1121 break;
1122 case 1: /* erase from start to cursor */
1123 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1124 start = (unsigned short *)vc->vc_origin;
1125 if (DO_UPDATE(vc)) {
1126 /* do in two stages */
1127 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1128 vc->vc_cols);
1129 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1130 vc->vc_x + 1);
1131 }
1132 break;
1133 case 2: /* erase whole display */
1134 count = vc->vc_cols * vc->vc_rows;
1135 start = (unsigned short *)vc->vc_origin;
1136 if (DO_UPDATE(vc))
1137 vc->vc_sw->con_clear(vc, 0, 0,
1138 vc->vc_rows,
1139 vc->vc_cols);
1140 break;
1141 default:
1142 return;
1143 }
1144 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1145 vc->vc_need_wrap = 0;
1146 }
1147
1148 static void csi_K(struct vc_data *vc, int vpar)
1149 {
1150 unsigned int count;
1151 unsigned short * start;
1152
1153 switch (vpar) {
1154 case 0: /* erase from cursor to end of line */
1155 count = vc->vc_cols - vc->vc_x;
1156 start = (unsigned short *)vc->vc_pos;
1157 if (DO_UPDATE(vc))
1158 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1159 vc->vc_cols - vc->vc_x);
1160 break;
1161 case 1: /* erase from start of line to cursor */
1162 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1163 count = vc->vc_x + 1;
1164 if (DO_UPDATE(vc))
1165 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1166 vc->vc_x + 1);
1167 break;
1168 case 2: /* erase whole line */
1169 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1170 count = vc->vc_cols;
1171 if (DO_UPDATE(vc))
1172 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1173 vc->vc_cols);
1174 break;
1175 default:
1176 return;
1177 }
1178 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1179 vc->vc_need_wrap = 0;
1180 }
1181
1182 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1183 { /* not vt100? */
1184 int count;
1185
1186 if (!vpar)
1187 vpar++;
1188 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1189
1190 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1191 if (DO_UPDATE(vc))
1192 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1193 vc->vc_need_wrap = 0;
1194 }
1195
1196 static void default_attr(struct vc_data *vc)
1197 {
1198 vc->vc_intensity = 1;
1199 vc->vc_italic = 0;
1200 vc->vc_underline = 0;
1201 vc->vc_reverse = 0;
1202 vc->vc_blink = 0;
1203 vc->vc_color = vc->vc_def_color;
1204 }
1205
1206 /* console_sem is held */
1207 static void csi_m(struct vc_data *vc)
1208 {
1209 int i;
1210
1211 for (i = 0; i <= vc->vc_npar; i++)
1212 switch (vc->vc_par[i]) {
1213 case 0: /* all attributes off */
1214 default_attr(vc);
1215 break;
1216 case 1:
1217 vc->vc_intensity = 2;
1218 break;
1219 case 2:
1220 vc->vc_intensity = 0;
1221 break;
1222 case 3:
1223 vc->vc_italic = 1;
1224 break;
1225 case 4:
1226 vc->vc_underline = 1;
1227 break;
1228 case 5:
1229 vc->vc_blink = 1;
1230 break;
1231 case 7:
1232 vc->vc_reverse = 1;
1233 break;
1234 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1235 * Select primary font, don't display
1236 * control chars if defined, don't set
1237 * bit 8 on output.
1238 */
1239 vc->vc_translate = set_translate(vc->vc_charset == 0
1240 ? vc->vc_G0_charset
1241 : vc->vc_G1_charset, vc);
1242 vc->vc_disp_ctrl = 0;
1243 vc->vc_toggle_meta = 0;
1244 break;
1245 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1246 * Select first alternate font, lets
1247 * chars < 32 be displayed as ROM chars.
1248 */
1249 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1250 vc->vc_disp_ctrl = 1;
1251 vc->vc_toggle_meta = 0;
1252 break;
1253 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1254 * Select second alternate font, toggle
1255 * high bit before displaying as ROM char.
1256 */
1257 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1258 vc->vc_disp_ctrl = 1;
1259 vc->vc_toggle_meta = 1;
1260 break;
1261 case 21:
1262 case 22:
1263 vc->vc_intensity = 1;
1264 break;
1265 case 23:
1266 vc->vc_italic = 0;
1267 break;
1268 case 24:
1269 vc->vc_underline = 0;
1270 break;
1271 case 25:
1272 vc->vc_blink = 0;
1273 break;
1274 case 27:
1275 vc->vc_reverse = 0;
1276 break;
1277 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1278 * Enables underscore, white foreground
1279 * with white underscore (Linux - use
1280 * default foreground).
1281 */
1282 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1283 vc->vc_underline = 1;
1284 break;
1285 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1286 * Disable underline option.
1287 * Reset colour to default? It did this
1288 * before...
1289 */
1290 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1291 vc->vc_underline = 0;
1292 break;
1293 case 49:
1294 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1295 break;
1296 default:
1297 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1298 vc->vc_color = color_table[vc->vc_par[i] - 30]
1299 | (vc->vc_color & 0xf0);
1300 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1301 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1302 | (vc->vc_color & 0x0f);
1303 break;
1304 }
1305 update_attr(vc);
1306 }
1307
1308 static void respond_string(const char *p, struct tty_struct *tty)
1309 {
1310 while (*p) {
1311 tty_insert_flip_char(tty, *p, 0);
1312 p++;
1313 }
1314 con_schedule_flip(tty);
1315 }
1316
1317 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1318 {
1319 char buf[40];
1320
1321 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1322 respond_string(buf, tty);
1323 }
1324
1325 static inline void status_report(struct tty_struct *tty)
1326 {
1327 respond_string("\033[0n", tty); /* Terminal ok */
1328 }
1329
1330 static inline void respond_ID(struct tty_struct * tty)
1331 {
1332 respond_string(VT102ID, tty);
1333 }
1334
1335 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1336 {
1337 char buf[8];
1338
1339 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1340 (char)('!' + mry));
1341 respond_string(buf, tty);
1342 }
1343
1344 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1345 int mouse_reporting(void)
1346 {
1347 return vc_cons[fg_console].d->vc_report_mouse;
1348 }
1349
1350 /* console_sem is held */
1351 static void set_mode(struct vc_data *vc, int on_off)
1352 {
1353 int i;
1354
1355 for (i = 0; i <= vc->vc_npar; i++)
1356 if (vc->vc_ques) {
1357 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1358 case 1: /* Cursor keys send ^[Ox/^[[x */
1359 if (on_off)
1360 set_kbd(vc, decckm);
1361 else
1362 clr_kbd(vc, decckm);
1363 break;
1364 case 3: /* 80/132 mode switch unimplemented */
1365 vc->vc_deccolm = on_off;
1366 #if 0
1367 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1368 /* this alone does not suffice; some user mode
1369 utility has to change the hardware regs */
1370 #endif
1371 break;
1372 case 5: /* Inverted screen on/off */
1373 if (vc->vc_decscnm != on_off) {
1374 vc->vc_decscnm = on_off;
1375 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1376 update_attr(vc);
1377 }
1378 break;
1379 case 6: /* Origin relative/absolute */
1380 vc->vc_decom = on_off;
1381 gotoxay(vc, 0, 0);
1382 break;
1383 case 7: /* Autowrap on/off */
1384 vc->vc_decawm = on_off;
1385 break;
1386 case 8: /* Autorepeat on/off */
1387 if (on_off)
1388 set_kbd(vc, decarm);
1389 else
1390 clr_kbd(vc, decarm);
1391 break;
1392 case 9:
1393 vc->vc_report_mouse = on_off ? 1 : 0;
1394 break;
1395 case 25: /* Cursor on/off */
1396 vc->vc_deccm = on_off;
1397 break;
1398 case 1000:
1399 vc->vc_report_mouse = on_off ? 2 : 0;
1400 break;
1401 }
1402 } else {
1403 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1404 case 3: /* Monitor (display ctrls) */
1405 vc->vc_disp_ctrl = on_off;
1406 break;
1407 case 4: /* Insert Mode on/off */
1408 vc->vc_decim = on_off;
1409 break;
1410 case 20: /* Lf, Enter == CrLf/Lf */
1411 if (on_off)
1412 set_kbd(vc, lnm);
1413 else
1414 clr_kbd(vc, lnm);
1415 break;
1416 }
1417 }
1418 }
1419
1420 /* console_sem is held */
1421 static void setterm_command(struct vc_data *vc)
1422 {
1423 switch(vc->vc_par[0]) {
1424 case 1: /* set color for underline mode */
1425 if (vc->vc_can_do_color &&
1426 vc->vc_par[1] < 16) {
1427 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1428 if (vc->vc_underline)
1429 update_attr(vc);
1430 }
1431 break;
1432 case 2: /* set color for half intensity mode */
1433 if (vc->vc_can_do_color &&
1434 vc->vc_par[1] < 16) {
1435 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1436 if (vc->vc_intensity == 0)
1437 update_attr(vc);
1438 }
1439 break;
1440 case 8: /* store colors as defaults */
1441 vc->vc_def_color = vc->vc_attr;
1442 if (vc->vc_hi_font_mask == 0x100)
1443 vc->vc_def_color >>= 1;
1444 default_attr(vc);
1445 update_attr(vc);
1446 break;
1447 case 9: /* set blanking interval */
1448 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1449 poke_blanked_console();
1450 break;
1451 case 10: /* set bell frequency in Hz */
1452 if (vc->vc_npar >= 1)
1453 vc->vc_bell_pitch = vc->vc_par[1];
1454 else
1455 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1456 break;
1457 case 11: /* set bell duration in msec */
1458 if (vc->vc_npar >= 1)
1459 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1460 vc->vc_par[1] * HZ / 1000 : 0;
1461 else
1462 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1463 break;
1464 case 12: /* bring specified console to the front */
1465 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1466 set_console(vc->vc_par[1] - 1);
1467 break;
1468 case 13: /* unblank the screen */
1469 poke_blanked_console();
1470 break;
1471 case 14: /* set vesa powerdown interval */
1472 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1473 break;
1474 case 15: /* activate the previous console */
1475 set_console(last_console);
1476 break;
1477 }
1478 }
1479
1480 /* console_sem is held */
1481 static void csi_at(struct vc_data *vc, unsigned int nr)
1482 {
1483 if (nr > vc->vc_cols - vc->vc_x)
1484 nr = vc->vc_cols - vc->vc_x;
1485 else if (!nr)
1486 nr = 1;
1487 insert_char(vc, nr);
1488 }
1489
1490 /* console_sem is held */
1491 static void csi_L(struct vc_data *vc, unsigned int nr)
1492 {
1493 if (nr > vc->vc_rows - vc->vc_y)
1494 nr = vc->vc_rows - vc->vc_y;
1495 else if (!nr)
1496 nr = 1;
1497 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1498 vc->vc_need_wrap = 0;
1499 }
1500
1501 /* console_sem is held */
1502 static void csi_P(struct vc_data *vc, unsigned int nr)
1503 {
1504 if (nr > vc->vc_cols - vc->vc_x)
1505 nr = vc->vc_cols - vc->vc_x;
1506 else if (!nr)
1507 nr = 1;
1508 delete_char(vc, nr);
1509 }
1510
1511 /* console_sem is held */
1512 static void csi_M(struct vc_data *vc, unsigned int nr)
1513 {
1514 if (nr > vc->vc_rows - vc->vc_y)
1515 nr = vc->vc_rows - vc->vc_y;
1516 else if (!nr)
1517 nr=1;
1518 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1519 vc->vc_need_wrap = 0;
1520 }
1521
1522 /* console_sem is held (except via vc_init->reset_terminal */
1523 static void save_cur(struct vc_data *vc)
1524 {
1525 vc->vc_saved_x = vc->vc_x;
1526 vc->vc_saved_y = vc->vc_y;
1527 vc->vc_s_intensity = vc->vc_intensity;
1528 vc->vc_s_italic = vc->vc_italic;
1529 vc->vc_s_underline = vc->vc_underline;
1530 vc->vc_s_blink = vc->vc_blink;
1531 vc->vc_s_reverse = vc->vc_reverse;
1532 vc->vc_s_charset = vc->vc_charset;
1533 vc->vc_s_color = vc->vc_color;
1534 vc->vc_saved_G0 = vc->vc_G0_charset;
1535 vc->vc_saved_G1 = vc->vc_G1_charset;
1536 }
1537
1538 /* console_sem is held */
1539 static void restore_cur(struct vc_data *vc)
1540 {
1541 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1542 vc->vc_intensity = vc->vc_s_intensity;
1543 vc->vc_italic = vc->vc_s_italic;
1544 vc->vc_underline = vc->vc_s_underline;
1545 vc->vc_blink = vc->vc_s_blink;
1546 vc->vc_reverse = vc->vc_s_reverse;
1547 vc->vc_charset = vc->vc_s_charset;
1548 vc->vc_color = vc->vc_s_color;
1549 vc->vc_G0_charset = vc->vc_saved_G0;
1550 vc->vc_G1_charset = vc->vc_saved_G1;
1551 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1552 update_attr(vc);
1553 vc->vc_need_wrap = 0;
1554 }
1555
1556 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1557 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1558 ESpalette };
1559
1560 /* console_sem is held (except via vc_init()) */
1561 static void reset_terminal(struct vc_data *vc, int do_clear)
1562 {
1563 vc->vc_top = 0;
1564 vc->vc_bottom = vc->vc_rows;
1565 vc->vc_state = ESnormal;
1566 vc->vc_ques = 0;
1567 vc->vc_translate = set_translate(LAT1_MAP, vc);
1568 vc->vc_G0_charset = LAT1_MAP;
1569 vc->vc_G1_charset = GRAF_MAP;
1570 vc->vc_charset = 0;
1571 vc->vc_need_wrap = 0;
1572 vc->vc_report_mouse = 0;
1573 vc->vc_utf = default_utf8;
1574 vc->vc_utf_count = 0;
1575
1576 vc->vc_disp_ctrl = 0;
1577 vc->vc_toggle_meta = 0;
1578
1579 vc->vc_decscnm = 0;
1580 vc->vc_decom = 0;
1581 vc->vc_decawm = 1;
1582 vc->vc_deccm = 1;
1583 vc->vc_decim = 0;
1584
1585 set_kbd(vc, decarm);
1586 clr_kbd(vc, decckm);
1587 clr_kbd(vc, kbdapplic);
1588 clr_kbd(vc, lnm);
1589 kbd_table[vc->vc_num].lockstate = 0;
1590 kbd_table[vc->vc_num].slockstate = 0;
1591 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1592 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1593 /* do not do set_leds here because this causes an endless tasklet loop
1594 when the keyboard hasn't been initialized yet */
1595
1596 vc->vc_cursor_type = CUR_DEFAULT;
1597 vc->vc_complement_mask = vc->vc_s_complement_mask;
1598
1599 default_attr(vc);
1600 update_attr(vc);
1601
1602 vc->vc_tab_stop[0] = 0x01010100;
1603 vc->vc_tab_stop[1] =
1604 vc->vc_tab_stop[2] =
1605 vc->vc_tab_stop[3] =
1606 vc->vc_tab_stop[4] = 0x01010101;
1607
1608 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1609 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1610
1611 gotoxy(vc, 0, 0);
1612 save_cur(vc);
1613 if (do_clear)
1614 csi_J(vc, 2);
1615 }
1616
1617 /* console_sem is held */
1618 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1619 {
1620 /*
1621 * Control characters can be used in the _middle_
1622 * of an escape sequence.
1623 */
1624 switch (c) {
1625 case 0:
1626 return;
1627 case 7:
1628 if (vc->vc_bell_duration)
1629 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1630 return;
1631 case 8:
1632 bs(vc);
1633 return;
1634 case 9:
1635 vc->vc_pos -= (vc->vc_x << 1);
1636 while (vc->vc_x < vc->vc_cols - 1) {
1637 vc->vc_x++;
1638 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1639 break;
1640 }
1641 vc->vc_pos += (vc->vc_x << 1);
1642 notify_write(vc, '\t');
1643 return;
1644 case 10: case 11: case 12:
1645 lf(vc);
1646 if (!is_kbd(vc, lnm))
1647 return;
1648 case 13:
1649 cr(vc);
1650 return;
1651 case 14:
1652 vc->vc_charset = 1;
1653 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1654 vc->vc_disp_ctrl = 1;
1655 return;
1656 case 15:
1657 vc->vc_charset = 0;
1658 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1659 vc->vc_disp_ctrl = 0;
1660 return;
1661 case 24: case 26:
1662 vc->vc_state = ESnormal;
1663 return;
1664 case 27:
1665 vc->vc_state = ESesc;
1666 return;
1667 case 127:
1668 del(vc);
1669 return;
1670 case 128+27:
1671 vc->vc_state = ESsquare;
1672 return;
1673 }
1674 switch(vc->vc_state) {
1675 case ESesc:
1676 vc->vc_state = ESnormal;
1677 switch (c) {
1678 case '[':
1679 vc->vc_state = ESsquare;
1680 return;
1681 case ']':
1682 vc->vc_state = ESnonstd;
1683 return;
1684 case '%':
1685 vc->vc_state = ESpercent;
1686 return;
1687 case 'E':
1688 cr(vc);
1689 lf(vc);
1690 return;
1691 case 'M':
1692 ri(vc);
1693 return;
1694 case 'D':
1695 lf(vc);
1696 return;
1697 case 'H':
1698 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1699 return;
1700 case 'Z':
1701 respond_ID(tty);
1702 return;
1703 case '7':
1704 save_cur(vc);
1705 return;
1706 case '8':
1707 restore_cur(vc);
1708 return;
1709 case '(':
1710 vc->vc_state = ESsetG0;
1711 return;
1712 case ')':
1713 vc->vc_state = ESsetG1;
1714 return;
1715 case '#':
1716 vc->vc_state = EShash;
1717 return;
1718 case 'c':
1719 reset_terminal(vc, 1);
1720 return;
1721 case '>': /* Numeric keypad */
1722 clr_kbd(vc, kbdapplic);
1723 return;
1724 case '=': /* Appl. keypad */
1725 set_kbd(vc, kbdapplic);
1726 return;
1727 }
1728 return;
1729 case ESnonstd:
1730 if (c=='P') { /* palette escape sequence */
1731 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1732 vc->vc_par[vc->vc_npar] = 0;
1733 vc->vc_npar = 0;
1734 vc->vc_state = ESpalette;
1735 return;
1736 } else if (c=='R') { /* reset palette */
1737 reset_palette(vc);
1738 vc->vc_state = ESnormal;
1739 } else
1740 vc->vc_state = ESnormal;
1741 return;
1742 case ESpalette:
1743 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1744 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1745 if (vc->vc_npar == 7) {
1746 int i = vc->vc_par[0] * 3, j = 1;
1747 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1748 vc->vc_palette[i++] += vc->vc_par[j++];
1749 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1750 vc->vc_palette[i++] += vc->vc_par[j++];
1751 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1752 vc->vc_palette[i] += vc->vc_par[j];
1753 set_palette(vc);
1754 vc->vc_state = ESnormal;
1755 }
1756 } else
1757 vc->vc_state = ESnormal;
1758 return;
1759 case ESsquare:
1760 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1761 vc->vc_par[vc->vc_npar] = 0;
1762 vc->vc_npar = 0;
1763 vc->vc_state = ESgetpars;
1764 if (c == '[') { /* Function key */
1765 vc->vc_state=ESfunckey;
1766 return;
1767 }
1768 vc->vc_ques = (c == '?');
1769 if (vc->vc_ques)
1770 return;
1771 case ESgetpars:
1772 if (c == ';' && vc->vc_npar < NPAR - 1) {
1773 vc->vc_npar++;
1774 return;
1775 } else if (c>='0' && c<='9') {
1776 vc->vc_par[vc->vc_npar] *= 10;
1777 vc->vc_par[vc->vc_npar] += c - '0';
1778 return;
1779 } else
1780 vc->vc_state = ESgotpars;
1781 case ESgotpars:
1782 vc->vc_state = ESnormal;
1783 switch(c) {
1784 case 'h':
1785 set_mode(vc, 1);
1786 return;
1787 case 'l':
1788 set_mode(vc, 0);
1789 return;
1790 case 'c':
1791 if (vc->vc_ques) {
1792 if (vc->vc_par[0])
1793 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1794 else
1795 vc->vc_cursor_type = CUR_DEFAULT;
1796 return;
1797 }
1798 break;
1799 case 'm':
1800 if (vc->vc_ques) {
1801 clear_selection();
1802 if (vc->vc_par[0])
1803 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1804 else
1805 vc->vc_complement_mask = vc->vc_s_complement_mask;
1806 return;
1807 }
1808 break;
1809 case 'n':
1810 if (!vc->vc_ques) {
1811 if (vc->vc_par[0] == 5)
1812 status_report(tty);
1813 else if (vc->vc_par[0] == 6)
1814 cursor_report(vc, tty);
1815 }
1816 return;
1817 }
1818 if (vc->vc_ques) {
1819 vc->vc_ques = 0;
1820 return;
1821 }
1822 switch(c) {
1823 case 'G': case '`':
1824 if (vc->vc_par[0])
1825 vc->vc_par[0]--;
1826 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1827 return;
1828 case 'A':
1829 if (!vc->vc_par[0])
1830 vc->vc_par[0]++;
1831 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1832 return;
1833 case 'B': case 'e':
1834 if (!vc->vc_par[0])
1835 vc->vc_par[0]++;
1836 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1837 return;
1838 case 'C': case 'a':
1839 if (!vc->vc_par[0])
1840 vc->vc_par[0]++;
1841 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1842 return;
1843 case 'D':
1844 if (!vc->vc_par[0])
1845 vc->vc_par[0]++;
1846 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1847 return;
1848 case 'E':
1849 if (!vc->vc_par[0])
1850 vc->vc_par[0]++;
1851 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1852 return;
1853 case 'F':
1854 if (!vc->vc_par[0])
1855 vc->vc_par[0]++;
1856 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1857 return;
1858 case 'd':
1859 if (vc->vc_par[0])
1860 vc->vc_par[0]--;
1861 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1862 return;
1863 case 'H': case 'f':
1864 if (vc->vc_par[0])
1865 vc->vc_par[0]--;
1866 if (vc->vc_par[1])
1867 vc->vc_par[1]--;
1868 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1869 return;
1870 case 'J':
1871 csi_J(vc, vc->vc_par[0]);
1872 return;
1873 case 'K':
1874 csi_K(vc, vc->vc_par[0]);
1875 return;
1876 case 'L':
1877 csi_L(vc, vc->vc_par[0]);
1878 return;
1879 case 'M':
1880 csi_M(vc, vc->vc_par[0]);
1881 return;
1882 case 'P':
1883 csi_P(vc, vc->vc_par[0]);
1884 return;
1885 case 'c':
1886 if (!vc->vc_par[0])
1887 respond_ID(tty);
1888 return;
1889 case 'g':
1890 if (!vc->vc_par[0])
1891 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1892 else if (vc->vc_par[0] == 3) {
1893 vc->vc_tab_stop[0] =
1894 vc->vc_tab_stop[1] =
1895 vc->vc_tab_stop[2] =
1896 vc->vc_tab_stop[3] =
1897 vc->vc_tab_stop[4] = 0;
1898 }
1899 return;
1900 case 'm':
1901 csi_m(vc);
1902 return;
1903 case 'q': /* DECLL - but only 3 leds */
1904 /* map 0,1,2,3 to 0,1,2,4 */
1905 if (vc->vc_par[0] < 4)
1906 setledstate(kbd_table + vc->vc_num,
1907 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1908 return;
1909 case 'r':
1910 if (!vc->vc_par[0])
1911 vc->vc_par[0]++;
1912 if (!vc->vc_par[1])
1913 vc->vc_par[1] = vc->vc_rows;
1914 /* Minimum allowed region is 2 lines */
1915 if (vc->vc_par[0] < vc->vc_par[1] &&
1916 vc->vc_par[1] <= vc->vc_rows) {
1917 vc->vc_top = vc->vc_par[0] - 1;
1918 vc->vc_bottom = vc->vc_par[1];
1919 gotoxay(vc, 0, 0);
1920 }
1921 return;
1922 case 's':
1923 save_cur(vc);
1924 return;
1925 case 'u':
1926 restore_cur(vc);
1927 return;
1928 case 'X':
1929 csi_X(vc, vc->vc_par[0]);
1930 return;
1931 case '@':
1932 csi_at(vc, vc->vc_par[0]);
1933 return;
1934 case ']': /* setterm functions */
1935 setterm_command(vc);
1936 return;
1937 }
1938 return;
1939 case ESpercent:
1940 vc->vc_state = ESnormal;
1941 switch (c) {
1942 case '@': /* defined in ISO 2022 */
1943 vc->vc_utf = 0;
1944 return;
1945 case 'G': /* prelim official escape code */
1946 case '8': /* retained for compatibility */
1947 vc->vc_utf = 1;
1948 return;
1949 }
1950 return;
1951 case ESfunckey:
1952 vc->vc_state = ESnormal;
1953 return;
1954 case EShash:
1955 vc->vc_state = ESnormal;
1956 if (c == '8') {
1957 /* DEC screen alignment test. kludge :-) */
1958 vc->vc_video_erase_char =
1959 (vc->vc_video_erase_char & 0xff00) | 'E';
1960 csi_J(vc, 2);
1961 vc->vc_video_erase_char =
1962 (vc->vc_video_erase_char & 0xff00) | ' ';
1963 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1964 }
1965 return;
1966 case ESsetG0:
1967 if (c == '0')
1968 vc->vc_G0_charset = GRAF_MAP;
1969 else if (c == 'B')
1970 vc->vc_G0_charset = LAT1_MAP;
1971 else if (c == 'U')
1972 vc->vc_G0_charset = IBMPC_MAP;
1973 else if (c == 'K')
1974 vc->vc_G0_charset = USER_MAP;
1975 if (vc->vc_charset == 0)
1976 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1977 vc->vc_state = ESnormal;
1978 return;
1979 case ESsetG1:
1980 if (c == '0')
1981 vc->vc_G1_charset = GRAF_MAP;
1982 else if (c == 'B')
1983 vc->vc_G1_charset = LAT1_MAP;
1984 else if (c == 'U')
1985 vc->vc_G1_charset = IBMPC_MAP;
1986 else if (c == 'K')
1987 vc->vc_G1_charset = USER_MAP;
1988 if (vc->vc_charset == 1)
1989 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1990 vc->vc_state = ESnormal;
1991 return;
1992 default:
1993 vc->vc_state = ESnormal;
1994 }
1995 }
1996
1997 /* This is a temporary buffer used to prepare a tty console write
1998 * so that we can easily avoid touching user space while holding the
1999 * console spinlock. It is allocated in con_init and is shared by
2000 * this code and the vc_screen read/write tty calls.
2001 *
2002 * We have to allocate this statically in the kernel data section
2003 * since console_init (and thus con_init) are called before any
2004 * kernel memory allocation is available.
2005 */
2006 char con_buf[CON_BUF_SIZE];
2007 DEFINE_MUTEX(con_buf_mtx);
2008
2009 /* is_double_width() is based on the wcwidth() implementation by
2010 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2011 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2012 */
2013 struct interval {
2014 uint32_t first;
2015 uint32_t last;
2016 };
2017
2018 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2019 {
2020 int min = 0;
2021 int mid;
2022
2023 if (ucs < table[0].first || ucs > table[max].last)
2024 return 0;
2025 while (max >= min) {
2026 mid = (min + max) / 2;
2027 if (ucs > table[mid].last)
2028 min = mid + 1;
2029 else if (ucs < table[mid].first)
2030 max = mid - 1;
2031 else
2032 return 1;
2033 }
2034 return 0;
2035 }
2036
2037 static int is_double_width(uint32_t ucs)
2038 {
2039 static const struct interval double_width[] = {
2040 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2041 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2042 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2043 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2044 };
2045 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2046 }
2047
2048 /* acquires console_sem */
2049 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2050 {
2051 #ifdef VT_BUF_VRAM_ONLY
2052 #define FLUSH do { } while(0);
2053 #else
2054 #define FLUSH if (draw_x >= 0) { \
2055 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2056 draw_x = -1; \
2057 }
2058 #endif
2059
2060 int c, tc, ok, n = 0, draw_x = -1;
2061 unsigned int currcons;
2062 unsigned long draw_from = 0, draw_to = 0;
2063 struct vc_data *vc;
2064 unsigned char vc_attr;
2065 struct vt_notifier_param param;
2066 uint8_t rescan;
2067 uint8_t inverse;
2068 uint8_t width;
2069 u16 himask, charmask;
2070 const unsigned char *orig_buf = NULL;
2071 int orig_count;
2072
2073 if (in_interrupt())
2074 return count;
2075
2076 might_sleep();
2077
2078 acquire_console_sem();
2079 vc = tty->driver_data;
2080 if (vc == NULL) {
2081 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2082 release_console_sem();
2083 return 0;
2084 }
2085
2086 currcons = vc->vc_num;
2087 if (!vc_cons_allocated(currcons)) {
2088 /* could this happen? */
2089 static int error = 0;
2090 if (!error) {
2091 error = 1;
2092 printk("con_write: tty %d not allocated\n", currcons+1);
2093 }
2094 release_console_sem();
2095 return 0;
2096 }
2097 release_console_sem();
2098
2099 orig_buf = buf;
2100 orig_count = count;
2101
2102 /* At this point 'buf' is guaranteed to be a kernel buffer
2103 * and therefore no access to userspace (and therefore sleeping)
2104 * will be needed. The con_buf_mtx serializes all tty based
2105 * console rendering and vcs write/read operations. We hold
2106 * the console spinlock during the entire write.
2107 */
2108
2109 acquire_console_sem();
2110
2111 vc = tty->driver_data;
2112 if (vc == NULL) {
2113 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2114 release_console_sem();
2115 goto out;
2116 }
2117
2118 himask = vc->vc_hi_font_mask;
2119 charmask = himask ? 0x1ff : 0xff;
2120
2121 /* undraw cursor first */
2122 if (IS_FG(vc))
2123 hide_cursor(vc);
2124
2125 param.vc = vc;
2126
2127 while (!tty->stopped && count) {
2128 int orig = *buf;
2129 c = orig;
2130 buf++;
2131 n++;
2132 count--;
2133 rescan = 0;
2134 inverse = 0;
2135 width = 1;
2136
2137 /* Do no translation at all in control states */
2138 if (vc->vc_state != ESnormal) {
2139 tc = c;
2140 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2141 /* Combine UTF-8 into Unicode in vc_utf_char.
2142 * vc_utf_count is the number of continuation bytes still
2143 * expected to arrive.
2144 * vc_npar is the number of continuation bytes arrived so
2145 * far
2146 */
2147 rescan_last_byte:
2148 if ((c & 0xc0) == 0x80) {
2149 /* Continuation byte received */
2150 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2151 if (vc->vc_utf_count) {
2152 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2153 vc->vc_npar++;
2154 if (--vc->vc_utf_count) {
2155 /* Still need some bytes */
2156 continue;
2157 }
2158 /* Got a whole character */
2159 c = vc->vc_utf_char;
2160 /* Reject overlong sequences */
2161 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2162 c > utf8_length_changes[vc->vc_npar])
2163 c = 0xfffd;
2164 } else {
2165 /* Unexpected continuation byte */
2166 vc->vc_utf_count = 0;
2167 c = 0xfffd;
2168 }
2169 } else {
2170 /* Single ASCII byte or first byte of a sequence received */
2171 if (vc->vc_utf_count) {
2172 /* Continuation byte expected */
2173 rescan = 1;
2174 vc->vc_utf_count = 0;
2175 c = 0xfffd;
2176 } else if (c > 0x7f) {
2177 /* First byte of a multibyte sequence received */
2178 vc->vc_npar = 0;
2179 if ((c & 0xe0) == 0xc0) {
2180 vc->vc_utf_count = 1;
2181 vc->vc_utf_char = (c & 0x1f);
2182 } else if ((c & 0xf0) == 0xe0) {
2183 vc->vc_utf_count = 2;
2184 vc->vc_utf_char = (c & 0x0f);
2185 } else if ((c & 0xf8) == 0xf0) {
2186 vc->vc_utf_count = 3;
2187 vc->vc_utf_char = (c & 0x07);
2188 } else if ((c & 0xfc) == 0xf8) {
2189 vc->vc_utf_count = 4;
2190 vc->vc_utf_char = (c & 0x03);
2191 } else if ((c & 0xfe) == 0xfc) {
2192 vc->vc_utf_count = 5;
2193 vc->vc_utf_char = (c & 0x01);
2194 } else {
2195 /* 254 and 255 are invalid */
2196 c = 0xfffd;
2197 }
2198 if (vc->vc_utf_count) {
2199 /* Still need some bytes */
2200 continue;
2201 }
2202 }
2203 /* Nothing to do if an ASCII byte was received */
2204 }
2205 /* End of UTF-8 decoding. */
2206 /* c is the received character, or U+FFFD for invalid sequences. */
2207 /* Replace invalid Unicode code points with U+FFFD too */
2208 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2209 c = 0xfffd;
2210 tc = c;
2211 } else { /* no utf or alternate charset mode */
2212 tc = vc_translate(vc, c);
2213 }
2214
2215 param.c = tc;
2216 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2217 &param) == NOTIFY_STOP)
2218 continue;
2219
2220 /* If the original code was a control character we
2221 * only allow a glyph to be displayed if the code is
2222 * not normally used (such as for cursor movement) or
2223 * if the disp_ctrl mode has been explicitly enabled.
2224 * Certain characters (as given by the CTRL_ALWAYS
2225 * bitmap) are always displayed as control characters,
2226 * as the console would be pretty useless without
2227 * them; to display an arbitrary font position use the
2228 * direct-to-font zone in UTF-8 mode.
2229 */
2230 ok = tc && (c >= 32 ||
2231 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2232 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2233 && (c != 127 || vc->vc_disp_ctrl)
2234 && (c != 128+27);
2235
2236 if (vc->vc_state == ESnormal && ok) {
2237 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2238 if (is_double_width(c))
2239 width = 2;
2240 }
2241 /* Now try to find out how to display it */
2242 tc = conv_uni_to_pc(vc, tc);
2243 if (tc & ~charmask) {
2244 if (tc == -1 || tc == -2) {
2245 continue; /* nothing to display */
2246 }
2247 /* Glyph not found */
2248 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2249 /* In legacy mode use the glyph we get by a 1:1 mapping.
2250 This would make absolutely no sense with Unicode in mind,
2251 but do this for ASCII characters since a font may lack
2252 Unicode mapping info and we don't want to end up with
2253 having question marks only. */
2254 tc = c;
2255 } else {
2256 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2257 tc = conv_uni_to_pc(vc, 0xfffd);
2258 if (tc < 0) {
2259 inverse = 1;
2260 tc = conv_uni_to_pc(vc, '?');
2261 if (tc < 0) tc = '?';
2262 }
2263 }
2264 }
2265
2266 if (!inverse) {
2267 vc_attr = vc->vc_attr;
2268 } else {
2269 /* invert vc_attr */
2270 if (!vc->vc_can_do_color) {
2271 vc_attr = (vc->vc_attr) ^ 0x08;
2272 } else if (vc->vc_hi_font_mask == 0x100) {
2273 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2274 } else {
2275 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2276 }
2277 FLUSH
2278 }
2279
2280 while (1) {
2281 if (vc->vc_need_wrap || vc->vc_decim)
2282 FLUSH
2283 if (vc->vc_need_wrap) {
2284 cr(vc);
2285 lf(vc);
2286 }
2287 if (vc->vc_decim)
2288 insert_char(vc, 1);
2289 scr_writew(himask ?
2290 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2291 (vc_attr << 8) + tc,
2292 (u16 *) vc->vc_pos);
2293 if (DO_UPDATE(vc) && draw_x < 0) {
2294 draw_x = vc->vc_x;
2295 draw_from = vc->vc_pos;
2296 }
2297 if (vc->vc_x == vc->vc_cols - 1) {
2298 vc->vc_need_wrap = vc->vc_decawm;
2299 draw_to = vc->vc_pos + 2;
2300 } else {
2301 vc->vc_x++;
2302 draw_to = (vc->vc_pos += 2);
2303 }
2304
2305 if (!--width) break;
2306
2307 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2308 if (tc < 0) tc = ' ';
2309 }
2310 notify_write(vc, c);
2311
2312 if (inverse) {
2313 FLUSH
2314 }
2315
2316 if (rescan) {
2317 rescan = 0;
2318 inverse = 0;
2319 width = 1;
2320 c = orig;
2321 goto rescan_last_byte;
2322 }
2323 continue;
2324 }
2325 FLUSH
2326 do_con_trol(tty, vc, orig);
2327 }
2328 FLUSH
2329 console_conditional_schedule();
2330 release_console_sem();
2331
2332 out:
2333 notify_update(vc);
2334 return n;
2335 #undef FLUSH
2336 }
2337
2338 /*
2339 * This is the console switching callback.
2340 *
2341 * Doing console switching in a process context allows
2342 * us to do the switches asynchronously (needed when we want
2343 * to switch due to a keyboard interrupt). Synchronization
2344 * with other console code and prevention of re-entrancy is
2345 * ensured with console_sem.
2346 */
2347 static void console_callback(struct work_struct *ignored)
2348 {
2349 acquire_console_sem();
2350
2351 if (want_console >= 0) {
2352 if (want_console != fg_console &&
2353 vc_cons_allocated(want_console)) {
2354 hide_cursor(vc_cons[fg_console].d);
2355 change_console(vc_cons[want_console].d);
2356 /* we only changed when the console had already
2357 been allocated - a new console is not created
2358 in an interrupt routine */
2359 }
2360 want_console = -1;
2361 }
2362 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2363 do_poke_blanked_console = 0;
2364 poke_blanked_console();
2365 }
2366 if (scrollback_delta) {
2367 struct vc_data *vc = vc_cons[fg_console].d;
2368 clear_selection();
2369 if (vc->vc_mode == KD_TEXT)
2370 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2371 scrollback_delta = 0;
2372 }
2373 if (blank_timer_expired) {
2374 do_blank_screen(0);
2375 blank_timer_expired = 0;
2376 }
2377 notify_update(vc_cons[fg_console].d);
2378
2379 release_console_sem();
2380 }
2381
2382 int set_console(int nr)
2383 {
2384 struct vc_data *vc = vc_cons[fg_console].d;
2385
2386 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2387 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2388
2389 /*
2390 * Console switch will fail in console_callback() or
2391 * change_console() so there is no point scheduling
2392 * the callback
2393 *
2394 * Existing set_console() users don't check the return
2395 * value so this shouldn't break anything
2396 */
2397 return -EINVAL;
2398 }
2399
2400 want_console = nr;
2401 schedule_console_callback();
2402
2403 return 0;
2404 }
2405
2406 struct tty_driver *console_driver;
2407
2408 #ifdef CONFIG_VT_CONSOLE
2409
2410 /*
2411 * Console on virtual terminal
2412 *
2413 * The console must be locked when we get here.
2414 */
2415
2416 static void vt_console_print(struct console *co, const char *b, unsigned count)
2417 {
2418 struct vc_data *vc = vc_cons[fg_console].d;
2419 unsigned char c;
2420 static DEFINE_SPINLOCK(printing_lock);
2421 const ushort *start;
2422 ushort cnt = 0;
2423 ushort myx;
2424
2425 /* console busy or not yet initialized */
2426 if (!printable)
2427 return;
2428 if (!spin_trylock(&printing_lock))
2429 return;
2430
2431 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2432 vc = vc_cons[kmsg_redirect - 1].d;
2433
2434 /* read `x' only after setting currcons properly (otherwise
2435 the `x' macro will read the x of the foreground console). */
2436 myx = vc->vc_x;
2437
2438 if (!vc_cons_allocated(fg_console)) {
2439 /* impossible */
2440 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2441 goto quit;
2442 }
2443
2444 if (vc->vc_mode != KD_TEXT)
2445 goto quit;
2446
2447 /* undraw cursor first */
2448 if (IS_FG(vc))
2449 hide_cursor(vc);
2450
2451 start = (ushort *)vc->vc_pos;
2452
2453 /* Contrived structure to try to emulate original need_wrap behaviour
2454 * Problems caused when we have need_wrap set on '\n' character */
2455 while (count--) {
2456 c = *b++;
2457 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2458 if (cnt > 0) {
2459 if (CON_IS_VISIBLE(vc))
2460 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2461 vc->vc_x += cnt;
2462 if (vc->vc_need_wrap)
2463 vc->vc_x--;
2464 cnt = 0;
2465 }
2466 if (c == 8) { /* backspace */
2467 bs(vc);
2468 start = (ushort *)vc->vc_pos;
2469 myx = vc->vc_x;
2470 continue;
2471 }
2472 if (c != 13)
2473 lf(vc);
2474 cr(vc);
2475 start = (ushort *)vc->vc_pos;
2476 myx = vc->vc_x;
2477 if (c == 10 || c == 13)
2478 continue;
2479 }
2480 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2481 notify_write(vc, c);
2482 cnt++;
2483 if (myx == vc->vc_cols - 1) {
2484 vc->vc_need_wrap = 1;
2485 continue;
2486 }
2487 vc->vc_pos += 2;
2488 myx++;
2489 }
2490 if (cnt > 0) {
2491 if (CON_IS_VISIBLE(vc))
2492 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2493 vc->vc_x += cnt;
2494 if (vc->vc_x == vc->vc_cols) {
2495 vc->vc_x--;
2496 vc->vc_need_wrap = 1;
2497 }
2498 }
2499 set_cursor(vc);
2500 notify_update(vc);
2501
2502 quit:
2503 spin_unlock(&printing_lock);
2504 }
2505
2506 static struct tty_driver *vt_console_device(struct console *c, int *index)
2507 {
2508 *index = c->index ? c->index-1 : fg_console;
2509 return console_driver;
2510 }
2511
2512 static struct console vt_console_driver = {
2513 .name = "tty",
2514 .write = vt_console_print,
2515 .device = vt_console_device,
2516 .unblank = unblank_screen,
2517 .flags = CON_PRINTBUFFER,
2518 .index = -1,
2519 };
2520 #endif
2521
2522 /*
2523 * Handling of Linux-specific VC ioctls
2524 */
2525
2526 /*
2527 * Generally a bit racy with respect to console_sem().
2528 *
2529 * There are some functions which don't need it.
2530 *
2531 * There are some functions which can sleep for arbitrary periods
2532 * (paste_selection) but we don't need the lock there anyway.
2533 *
2534 * set_selection has locking, and definitely needs it
2535 */
2536
2537 int tioclinux(struct tty_struct *tty, unsigned long arg)
2538 {
2539 char type, data;
2540 char __user *p = (char __user *)arg;
2541 int lines;
2542 int ret;
2543
2544 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2545 return -EINVAL;
2546 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2547 return -EPERM;
2548 if (get_user(type, p))
2549 return -EFAULT;
2550 ret = 0;
2551
2552 lock_kernel();
2553
2554 switch (type)
2555 {
2556 case TIOCL_SETSEL:
2557 acquire_console_sem();
2558 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2559 release_console_sem();
2560 break;
2561 case TIOCL_PASTESEL:
2562 ret = paste_selection(tty);
2563 break;
2564 case TIOCL_UNBLANKSCREEN:
2565 acquire_console_sem();
2566 unblank_screen();
2567 release_console_sem();
2568 break;
2569 case TIOCL_SELLOADLUT:
2570 ret = sel_loadlut(p);
2571 break;
2572 case TIOCL_GETSHIFTSTATE:
2573
2574 /*
2575 * Make it possible to react to Shift+Mousebutton.
2576 * Note that 'shift_state' is an undocumented
2577 * kernel-internal variable; programs not closely
2578 * related to the kernel should not use this.
2579 */
2580 data = shift_state;
2581 ret = __put_user(data, p);
2582 break;
2583 case TIOCL_GETMOUSEREPORTING:
2584 data = mouse_reporting();
2585 ret = __put_user(data, p);
2586 break;
2587 case TIOCL_SETVESABLANK:
2588 ret = set_vesa_blanking(p);
2589 break;
2590 case TIOCL_GETKMSGREDIRECT:
2591 data = kmsg_redirect;
2592 ret = __put_user(data, p);
2593 break;
2594 case TIOCL_SETKMSGREDIRECT:
2595 if (!capable(CAP_SYS_ADMIN)) {
2596 ret = -EPERM;
2597 } else {
2598 if (get_user(data, p+1))
2599 ret = -EFAULT;
2600 else
2601 kmsg_redirect = data;
2602 }
2603 break;
2604 case TIOCL_GETFGCONSOLE:
2605 ret = fg_console;
2606 break;
2607 case TIOCL_SCROLLCONSOLE:
2608 if (get_user(lines, (s32 __user *)(p+4))) {
2609 ret = -EFAULT;
2610 } else {
2611 scrollfront(vc_cons[fg_console].d, lines);
2612 ret = 0;
2613 }
2614 break;
2615 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2616 acquire_console_sem();
2617 ignore_poke = 1;
2618 do_blank_screen(0);
2619 release_console_sem();
2620 break;
2621 case TIOCL_BLANKEDSCREEN:
2622 ret = console_blanked;
2623 break;
2624 default:
2625 ret = -EINVAL;
2626 break;
2627 }
2628 unlock_kernel();
2629 return ret;
2630 }
2631
2632 /*
2633 * /dev/ttyN handling
2634 */
2635
2636 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2637 {
2638 int retval;
2639
2640 retval = do_con_write(tty, buf, count);
2641 con_flush_chars(tty);
2642
2643 return retval;
2644 }
2645
2646 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2647 {
2648 if (in_interrupt())
2649 return 0; /* n_r3964 calls put_char() from interrupt context */
2650 return do_con_write(tty, &ch, 1);
2651 }
2652
2653 static int con_write_room(struct tty_struct *tty)
2654 {
2655 if (tty->stopped)
2656 return 0;
2657 return 4096; /* No limit, really; we're not buffering */
2658 }
2659
2660 static int con_chars_in_buffer(struct tty_struct *tty)
2661 {
2662 return 0; /* we're not buffering */
2663 }
2664
2665 /*
2666 * con_throttle and con_unthrottle are only used for
2667 * paste_selection(), which has to stuff in a large number of
2668 * characters...
2669 */
2670 static void con_throttle(struct tty_struct *tty)
2671 {
2672 }
2673
2674 static void con_unthrottle(struct tty_struct *tty)
2675 {
2676 struct vc_data *vc = tty->driver_data;
2677
2678 wake_up_interruptible(&vc->paste_wait);
2679 }
2680
2681 /*
2682 * Turn the Scroll-Lock LED on when the tty is stopped
2683 */
2684 static void con_stop(struct tty_struct *tty)
2685 {
2686 int console_num;
2687 if (!tty)
2688 return;
2689 console_num = tty->index;
2690 if (!vc_cons_allocated(console_num))
2691 return;
2692 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2693 set_leds();
2694 }
2695
2696 /*
2697 * Turn the Scroll-Lock LED off when the console is started
2698 */
2699 static void con_start(struct tty_struct *tty)
2700 {
2701 int console_num;
2702 if (!tty)
2703 return;
2704 console_num = tty->index;
2705 if (!vc_cons_allocated(console_num))
2706 return;
2707 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2708 set_leds();
2709 }
2710
2711 static void con_flush_chars(struct tty_struct *tty)
2712 {
2713 struct vc_data *vc;
2714
2715 if (in_interrupt()) /* from flush_to_ldisc */
2716 return;
2717
2718 /* if we race with con_close(), vt may be null */
2719 acquire_console_sem();
2720 vc = tty->driver_data;
2721 if (vc)
2722 set_cursor(vc);
2723 release_console_sem();
2724 }
2725
2726 /*
2727 * Allocate the console screen memory.
2728 */
2729 static int con_open(struct tty_struct *tty, struct file *filp)
2730 {
2731 unsigned int currcons = tty->index;
2732 int ret = 0;
2733
2734 acquire_console_sem();
2735 if (tty->driver_data == NULL) {
2736 ret = vc_allocate(currcons);
2737 if (ret == 0) {
2738 struct vc_data *vc = vc_cons[currcons].d;
2739 tty->driver_data = vc;
2740 vc->vc_tty = tty;
2741
2742 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2743 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2744 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2745 }
2746 if (vc->vc_utf)
2747 tty->termios->c_iflag |= IUTF8;
2748 else
2749 tty->termios->c_iflag &= ~IUTF8;
2750 vcs_make_sysfs(tty);
2751 release_console_sem();
2752 return ret;
2753 }
2754 }
2755 release_console_sem();
2756 return ret;
2757 }
2758
2759 /*
2760 * We take tty_mutex in here to prevent another thread from coming in via init_dev
2761 * and taking a ref against the tty while we're in the process of forgetting
2762 * about it and cleaning things up.
2763 *
2764 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
2765 */
2766 static void con_close(struct tty_struct *tty, struct file *filp)
2767 {
2768 mutex_lock(&tty_mutex);
2769 acquire_console_sem();
2770 if (tty && tty->count == 1) {
2771 struct vc_data *vc = tty->driver_data;
2772
2773 if (vc)
2774 vc->vc_tty = NULL;
2775 tty->driver_data = NULL;
2776 vcs_remove_sysfs(tty);
2777 release_console_sem();
2778 mutex_unlock(&tty_mutex);
2779 /*
2780 * tty_mutex is released, but we still hold BKL, so there is
2781 * still exclusion against init_dev()
2782 */
2783 return;
2784 }
2785 release_console_sem();
2786 mutex_unlock(&tty_mutex);
2787 }
2788
2789 static int default_italic_color = 2; // green (ASCII)
2790 static int default_underline_color = 3; // cyan (ASCII)
2791 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2792 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2793
2794 static void vc_init(struct vc_data *vc, unsigned int rows,
2795 unsigned int cols, int do_clear)
2796 {
2797 int j, k ;
2798
2799 vc->vc_cols = cols;
2800 vc->vc_rows = rows;
2801 vc->vc_size_row = cols << 1;
2802 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2803
2804 set_origin(vc);
2805 vc->vc_pos = vc->vc_origin;
2806 reset_vc(vc);
2807 for (j=k=0; j<16; j++) {
2808 vc->vc_palette[k++] = default_red[j] ;
2809 vc->vc_palette[k++] = default_grn[j] ;
2810 vc->vc_palette[k++] = default_blu[j] ;
2811 }
2812 vc->vc_def_color = 0x07; /* white */
2813 vc->vc_ulcolor = default_underline_color;
2814 vc->vc_itcolor = default_italic_color;
2815 vc->vc_halfcolor = 0x08; /* grey */
2816 init_waitqueue_head(&vc->paste_wait);
2817 reset_terminal(vc, do_clear);
2818 }
2819
2820 /*
2821 * This routine initializes console interrupts, and does nothing
2822 * else. If you want the screen to clear, call tty_write with
2823 * the appropriate escape-sequence.
2824 */
2825
2826 static int __init con_init(void)
2827 {
2828 const char *display_desc = NULL;
2829 struct vc_data *vc;
2830 unsigned int currcons = 0, i;
2831
2832 acquire_console_sem();
2833
2834 if (conswitchp)
2835 display_desc = conswitchp->con_startup();
2836 if (!display_desc) {
2837 fg_console = 0;
2838 release_console_sem();
2839 return 0;
2840 }
2841
2842 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2843 struct con_driver *con_driver = &registered_con_driver[i];
2844
2845 if (con_driver->con == NULL) {
2846 con_driver->con = conswitchp;
2847 con_driver->desc = display_desc;
2848 con_driver->flag = CON_DRIVER_FLAG_INIT;
2849 con_driver->first = 0;
2850 con_driver->last = MAX_NR_CONSOLES - 1;
2851 break;
2852 }
2853 }
2854
2855 for (i = 0; i < MAX_NR_CONSOLES; i++)
2856 con_driver_map[i] = conswitchp;
2857
2858 if (blankinterval) {
2859 blank_state = blank_normal_wait;
2860 mod_timer(&console_timer, jiffies + blankinterval);
2861 }
2862
2863 /*
2864 * kmalloc is not running yet - we use the bootmem allocator.
2865 */
2866 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2867 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2868 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2869 visual_init(vc, currcons, 1);
2870 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2871 vc->vc_kmalloced = 0;
2872 vc_init(vc, vc->vc_rows, vc->vc_cols,
2873 currcons || !vc->vc_sw->con_save_screen);
2874 }
2875 currcons = fg_console = 0;
2876 master_display_fg = vc = vc_cons[currcons].d;
2877 set_origin(vc);
2878 save_screen(vc);
2879 gotoxy(vc, vc->vc_x, vc->vc_y);
2880 csi_J(vc, 0);
2881 update_screen(vc);
2882 printk("Console: %s %s %dx%d",
2883 vc->vc_can_do_color ? "colour" : "mono",
2884 display_desc, vc->vc_cols, vc->vc_rows);
2885 printable = 1;
2886 printk("\n");
2887
2888 release_console_sem();
2889
2890 #ifdef CONFIG_VT_CONSOLE
2891 register_console(&vt_console_driver);
2892 #endif
2893 return 0;
2894 }
2895 console_initcall(con_init);
2896
2897 static const struct tty_operations con_ops = {
2898 .open = con_open,
2899 .close = con_close,
2900 .write = con_write,
2901 .write_room = con_write_room,
2902 .put_char = con_put_char,
2903 .flush_chars = con_flush_chars,
2904 .chars_in_buffer = con_chars_in_buffer,
2905 .ioctl = vt_ioctl,
2906 .stop = con_stop,
2907 .start = con_start,
2908 .throttle = con_throttle,
2909 .unthrottle = con_unthrottle,
2910 };
2911
2912 int __init vty_init(void)
2913 {
2914 vcs_init();
2915
2916 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2917 if (!console_driver)
2918 panic("Couldn't allocate console driver\n");
2919 console_driver->owner = THIS_MODULE;
2920 console_driver->name = "tty";
2921 console_driver->name_base = 1;
2922 console_driver->major = TTY_MAJOR;
2923 console_driver->minor_start = 1;
2924 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2925 console_driver->init_termios = tty_std_termios;
2926 if (default_utf8)
2927 console_driver->init_termios.c_iflag |= IUTF8;
2928 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2929 tty_set_operations(console_driver, &con_ops);
2930 if (tty_register_driver(console_driver))
2931 panic("Couldn't register console driver\n");
2932
2933 kbd_init();
2934 console_map_init();
2935 #ifdef CONFIG_PROM_CONSOLE
2936 prom_con_init();
2937 #endif
2938 #ifdef CONFIG_MDA_CONSOLE
2939 mda_console_init();
2940 #endif
2941 return 0;
2942 }
2943
2944 #ifndef VT_SINGLE_DRIVER
2945 #include <linux/device.h>
2946
2947 static struct class *vtconsole_class;
2948
2949 static int bind_con_driver(const struct consw *csw, int first, int last,
2950 int deflt)
2951 {
2952 struct module *owner = csw->owner;
2953 const char *desc = NULL;
2954 struct con_driver *con_driver;
2955 int i, j = -1, k = -1, retval = -ENODEV;
2956
2957 if (!try_module_get(owner))
2958 return -ENODEV;
2959
2960 acquire_console_sem();
2961
2962 /* check if driver is registered */
2963 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2964 con_driver = &registered_con_driver[i];
2965
2966 if (con_driver->con == csw) {
2967 desc = con_driver->desc;
2968 retval = 0;
2969 break;
2970 }
2971 }
2972
2973 if (retval)
2974 goto err;
2975
2976 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2977 csw->con_startup();
2978 con_driver->flag |= CON_DRIVER_FLAG_INIT;
2979 }
2980
2981 if (deflt) {
2982 if (conswitchp)
2983 module_put(conswitchp->owner);
2984
2985 __module_get(owner);
2986 conswitchp = csw;
2987 }
2988
2989 first = max(first, con_driver->first);
2990 last = min(last, con_driver->last);
2991
2992 for (i = first; i <= last; i++) {
2993 int old_was_color;
2994 struct vc_data *vc = vc_cons[i].d;
2995
2996 if (con_driver_map[i])
2997 module_put(con_driver_map[i]->owner);
2998 __module_get(owner);
2999 con_driver_map[i] = csw;
3000
3001 if (!vc || !vc->vc_sw)
3002 continue;
3003
3004 j = i;
3005
3006 if (CON_IS_VISIBLE(vc)) {
3007 k = i;
3008 save_screen(vc);
3009 }
3010
3011 old_was_color = vc->vc_can_do_color;
3012 vc->vc_sw->con_deinit(vc);
3013 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3014 visual_init(vc, i, 0);
3015 set_origin(vc);
3016 update_attr(vc);
3017
3018 /* If the console changed between mono <-> color, then
3019 * the attributes in the screenbuf will be wrong. The
3020 * following resets all attributes to something sane.
3021 */
3022 if (old_was_color != vc->vc_can_do_color)
3023 clear_buffer_attributes(vc);
3024 }
3025
3026 printk("Console: switching ");
3027 if (!deflt)
3028 printk("consoles %d-%d ", first+1, last+1);
3029 if (j >= 0) {
3030 struct vc_data *vc = vc_cons[j].d;
3031
3032 printk("to %s %s %dx%d\n",
3033 vc->vc_can_do_color ? "colour" : "mono",
3034 desc, vc->vc_cols, vc->vc_rows);
3035
3036 if (k >= 0) {
3037 vc = vc_cons[k].d;
3038 update_screen(vc);
3039 }
3040 } else
3041 printk("to %s\n", desc);
3042
3043 retval = 0;
3044 err:
3045 release_console_sem();
3046 module_put(owner);
3047 return retval;
3048 };
3049
3050 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3051 static int con_is_graphics(const struct consw *csw, int first, int last)
3052 {
3053 int i, retval = 0;
3054
3055 for (i = first; i <= last; i++) {
3056 struct vc_data *vc = vc_cons[i].d;
3057
3058 if (vc && vc->vc_mode == KD_GRAPHICS) {
3059 retval = 1;
3060 break;
3061 }
3062 }
3063
3064 return retval;
3065 }
3066
3067 /**
3068 * unbind_con_driver - unbind a console driver
3069 * @csw: pointer to console driver to unregister
3070 * @first: first in range of consoles that @csw should be unbound from
3071 * @last: last in range of consoles that @csw should be unbound from
3072 * @deflt: should next bound console driver be default after @csw is unbound?
3073 *
3074 * To unbind a driver from all possible consoles, pass 0 as @first and
3075 * %MAX_NR_CONSOLES as @last.
3076 *
3077 * @deflt controls whether the console that ends up replacing @csw should be
3078 * the default console.
3079 *
3080 * RETURNS:
3081 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3082 * or 0 on success.
3083 */
3084 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3085 {
3086 struct module *owner = csw->owner;
3087 const struct consw *defcsw = NULL;
3088 struct con_driver *con_driver = NULL, *con_back = NULL;
3089 int i, retval = -ENODEV;
3090
3091 if (!try_module_get(owner))
3092 return -ENODEV;
3093
3094 acquire_console_sem();
3095
3096 /* check if driver is registered and if it is unbindable */
3097 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3098 con_driver = &registered_con_driver[i];
3099
3100 if (con_driver->con == csw &&
3101 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3102 retval = 0;
3103 break;
3104 }
3105 }
3106
3107 if (retval) {
3108 release_console_sem();
3109 goto err;
3110 }
3111
3112 retval = -ENODEV;
3113
3114 /* check if backup driver exists */
3115 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3116 con_back = &registered_con_driver[i];
3117
3118 if (con_back->con &&
3119 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3120 defcsw = con_back->con;
3121 retval = 0;
3122 break;
3123 }
3124 }
3125
3126 if (retval) {
3127 release_console_sem();
3128 goto err;
3129 }
3130
3131 if (!con_is_bound(csw)) {
3132 release_console_sem();
3133 goto err;
3134 }
3135
3136 first = max(first, con_driver->first);
3137 last = min(last, con_driver->last);
3138
3139 for (i = first; i <= last; i++) {
3140 if (con_driver_map[i] == csw) {
3141 module_put(csw->owner);
3142 con_driver_map[i] = NULL;
3143 }
3144 }
3145
3146 if (!con_is_bound(defcsw)) {
3147 const struct consw *defconsw = conswitchp;
3148
3149 defcsw->con_startup();
3150 con_back->flag |= CON_DRIVER_FLAG_INIT;
3151 /*
3152 * vgacon may change the default driver to point
3153 * to dummycon, we restore it here...
3154 */
3155 conswitchp = defconsw;
3156 }
3157
3158 if (!con_is_bound(csw))
3159 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3160
3161 release_console_sem();
3162 /* ignore return value, binding should not fail */
3163 bind_con_driver(defcsw, first, last, deflt);
3164 err:
3165 module_put(owner);
3166 return retval;
3167
3168 }
3169 EXPORT_SYMBOL(unbind_con_driver);
3170
3171 static int vt_bind(struct con_driver *con)
3172 {
3173 const struct consw *defcsw = NULL, *csw = NULL;
3174 int i, more = 1, first = -1, last = -1, deflt = 0;
3175
3176 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3177 con_is_graphics(con->con, con->first, con->last))
3178 goto err;
3179
3180 csw = con->con;
3181
3182 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3183 struct con_driver *con = &registered_con_driver[i];
3184
3185 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3186 defcsw = con->con;
3187 break;
3188 }
3189 }
3190
3191 if (!defcsw)
3192 goto err;
3193
3194 while (more) {
3195 more = 0;
3196
3197 for (i = con->first; i <= con->last; i++) {
3198 if (con_driver_map[i] == defcsw) {
3199 if (first == -1)
3200 first = i;
3201 last = i;
3202 more = 1;
3203 } else if (first != -1)
3204 break;
3205 }
3206
3207 if (first == 0 && last == MAX_NR_CONSOLES -1)
3208 deflt = 1;
3209
3210 if (first != -1)
3211 bind_con_driver(csw, first, last, deflt);
3212
3213 first = -1;
3214 last = -1;
3215 deflt = 0;
3216 }
3217
3218 err:
3219 return 0;
3220 }
3221
3222 static int vt_unbind(struct con_driver *con)
3223 {
3224 const struct consw *csw = NULL;
3225 int i, more = 1, first = -1, last = -1, deflt = 0;
3226
3227 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3228 con_is_graphics(con->con, con->first, con->last))
3229 goto err;
3230
3231 csw = con->con;
3232
3233 while (more) {
3234 more = 0;
3235
3236 for (i = con->first; i <= con->last; i++) {
3237 if (con_driver_map[i] == csw) {
3238 if (first == -1)
3239 first = i;
3240 last = i;
3241 more = 1;
3242 } else if (first != -1)
3243 break;
3244 }
3245
3246 if (first == 0 && last == MAX_NR_CONSOLES -1)
3247 deflt = 1;
3248
3249 if (first != -1)
3250 unbind_con_driver(csw, first, last, deflt);
3251
3252 first = -1;
3253 last = -1;
3254 deflt = 0;
3255 }
3256
3257 err:
3258 return 0;
3259 }
3260 #else
3261 static inline int vt_bind(struct con_driver *con)
3262 {
3263 return 0;
3264 }
3265 static inline int vt_unbind(struct con_driver *con)
3266 {
3267 return 0;
3268 }
3269 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3270
3271 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3272 const char *buf, size_t count)
3273 {
3274 struct con_driver *con = dev_get_drvdata(dev);
3275 int bind = simple_strtoul(buf, NULL, 0);
3276
3277 if (bind)
3278 vt_bind(con);
3279 else
3280 vt_unbind(con);
3281
3282 return count;
3283 }
3284
3285 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3286 char *buf)
3287 {
3288 struct con_driver *con = dev_get_drvdata(dev);
3289 int bind = con_is_bound(con->con);
3290
3291 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3292 }
3293
3294 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3295 char *buf)
3296 {
3297 struct con_driver *con = dev_get_drvdata(dev);
3298
3299 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3300 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3301 con->desc);
3302
3303 }
3304
3305 static struct device_attribute device_attrs[] = {
3306 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3307 __ATTR(name, S_IRUGO, show_name, NULL),
3308 };
3309
3310 static int vtconsole_init_device(struct con_driver *con)
3311 {
3312 int i;
3313 int error = 0;
3314
3315 con->flag |= CON_DRIVER_FLAG_ATTR;
3316 dev_set_drvdata(con->dev, con);
3317 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3318 error = device_create_file(con->dev, &device_attrs[i]);
3319 if (error)
3320 break;
3321 }
3322
3323 if (error) {
3324 while (--i >= 0)
3325 device_remove_file(con->dev, &device_attrs[i]);
3326 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3327 }
3328
3329 return error;
3330 }
3331
3332 static void vtconsole_deinit_device(struct con_driver *con)
3333 {
3334 int i;
3335
3336 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3337 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3338 device_remove_file(con->dev, &device_attrs[i]);
3339 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3340 }
3341 }
3342
3343 /**
3344 * con_is_bound - checks if driver is bound to the console
3345 * @csw: console driver
3346 *
3347 * RETURNS: zero if unbound, nonzero if bound
3348 *
3349 * Drivers can call this and if zero, they should release
3350 * all resources allocated on con_startup()
3351 */
3352 int con_is_bound(const struct consw *csw)
3353 {
3354 int i, bound = 0;
3355
3356 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3357 if (con_driver_map[i] == csw) {
3358 bound = 1;
3359 break;
3360 }
3361 }
3362
3363 return bound;
3364 }
3365 EXPORT_SYMBOL(con_is_bound);
3366
3367 /**
3368 * register_con_driver - register console driver to console layer
3369 * @csw: console driver
3370 * @first: the first console to take over, minimum value is 0
3371 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3372 *
3373 * DESCRIPTION: This function registers a console driver which can later
3374 * bind to a range of consoles specified by @first and @last. It will
3375 * also initialize the console driver by calling con_startup().
3376 */
3377 int register_con_driver(const struct consw *csw, int first, int last)
3378 {
3379 struct module *owner = csw->owner;
3380 struct con_driver *con_driver;
3381 const char *desc;
3382 int i, retval = 0;
3383
3384 if (!try_module_get(owner))
3385 return -ENODEV;
3386
3387 acquire_console_sem();
3388
3389 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3390 con_driver = &registered_con_driver[i];
3391
3392 /* already registered */
3393 if (con_driver->con == csw)
3394 retval = -EINVAL;
3395 }
3396
3397 if (retval)
3398 goto err;
3399
3400 desc = csw->con_startup();
3401
3402 if (!desc)
3403 goto err;
3404
3405 retval = -EINVAL;
3406
3407 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3408 con_driver = &registered_con_driver[i];
3409
3410 if (con_driver->con == NULL) {
3411 con_driver->con = csw;
3412 con_driver->desc = desc;
3413 con_driver->node = i;
3414 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3415 CON_DRIVER_FLAG_INIT;
3416 con_driver->first = first;
3417 con_driver->last = last;
3418 retval = 0;
3419 break;
3420 }
3421 }
3422
3423 if (retval)
3424 goto err;
3425
3426 con_driver->dev = device_create_drvdata(vtconsole_class, NULL,
3427 MKDEV(0, con_driver->node),
3428 NULL, "vtcon%i",
3429 con_driver->node);
3430
3431 if (IS_ERR(con_driver->dev)) {
3432 printk(KERN_WARNING "Unable to create device for %s; "
3433 "errno = %ld\n", con_driver->desc,
3434 PTR_ERR(con_driver->dev));
3435 con_driver->dev = NULL;
3436 } else {
3437 vtconsole_init_device(con_driver);
3438 }
3439
3440 err:
3441 release_console_sem();
3442 module_put(owner);
3443 return retval;
3444 }
3445 EXPORT_SYMBOL(register_con_driver);
3446
3447 /**
3448 * unregister_con_driver - unregister console driver from console layer
3449 * @csw: console driver
3450 *
3451 * DESCRIPTION: All drivers that registers to the console layer must
3452 * call this function upon exit, or if the console driver is in a state
3453 * where it won't be able to handle console services, such as the
3454 * framebuffer console without loaded framebuffer drivers.
3455 *
3456 * The driver must unbind first prior to unregistration.
3457 */
3458 int unregister_con_driver(const struct consw *csw)
3459 {
3460 int i, retval = -ENODEV;
3461
3462 acquire_console_sem();
3463
3464 /* cannot unregister a bound driver */
3465 if (con_is_bound(csw))
3466 goto err;
3467
3468 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3469 struct con_driver *con_driver = &registered_con_driver[i];
3470
3471 if (con_driver->con == csw &&
3472 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3473 vtconsole_deinit_device(con_driver);
3474 device_destroy(vtconsole_class,
3475 MKDEV(0, con_driver->node));
3476 con_driver->con = NULL;
3477 con_driver->desc = NULL;
3478 con_driver->dev = NULL;
3479 con_driver->node = 0;
3480 con_driver->flag = 0;
3481 con_driver->first = 0;
3482 con_driver->last = 0;
3483 retval = 0;
3484 break;
3485 }
3486 }
3487 err:
3488 release_console_sem();
3489 return retval;
3490 }
3491 EXPORT_SYMBOL(unregister_con_driver);
3492
3493 /*
3494 * If we support more console drivers, this function is used
3495 * when a driver wants to take over some existing consoles
3496 * and become default driver for newly opened ones.
3497 *
3498 * take_over_console is basically a register followed by unbind
3499 */
3500 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3501 {
3502 int err;
3503
3504 err = register_con_driver(csw, first, last);
3505
3506 if (!err)
3507 bind_con_driver(csw, first, last, deflt);
3508
3509 return err;
3510 }
3511
3512 /*
3513 * give_up_console is a wrapper to unregister_con_driver. It will only
3514 * work if driver is fully unbound.
3515 */
3516 void give_up_console(const struct consw *csw)
3517 {
3518 unregister_con_driver(csw);
3519 }
3520
3521 static int __init vtconsole_class_init(void)
3522 {
3523 int i;
3524
3525 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3526 if (IS_ERR(vtconsole_class)) {
3527 printk(KERN_WARNING "Unable to create vt console class; "
3528 "errno = %ld\n", PTR_ERR(vtconsole_class));
3529 vtconsole_class = NULL;
3530 }
3531
3532 /* Add system drivers to sysfs */
3533 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3534 struct con_driver *con = &registered_con_driver[i];
3535
3536 if (con->con && !con->dev) {
3537 con->dev = device_create_drvdata(vtconsole_class, NULL,
3538 MKDEV(0, con->node),
3539 NULL, "vtcon%i",
3540 con->node);
3541
3542 if (IS_ERR(con->dev)) {
3543 printk(KERN_WARNING "Unable to create "
3544 "device for %s; errno = %ld\n",
3545 con->desc, PTR_ERR(con->dev));
3546 con->dev = NULL;
3547 } else {
3548 vtconsole_init_device(con);
3549 }
3550 }
3551 }
3552
3553 return 0;
3554 }
3555 postcore_initcall(vtconsole_class_init);
3556
3557 #endif
3558
3559 /*
3560 * Screen blanking
3561 */
3562
3563 static int set_vesa_blanking(char __user *p)
3564 {
3565 unsigned int mode;
3566
3567 if (get_user(mode, p + 1))
3568 return -EFAULT;
3569
3570 vesa_blank_mode = (mode < 4) ? mode : 0;
3571 return 0;
3572 }
3573
3574 void do_blank_screen(int entering_gfx)
3575 {
3576 struct vc_data *vc = vc_cons[fg_console].d;
3577 int i;
3578
3579 WARN_CONSOLE_UNLOCKED();
3580
3581 if (console_blanked) {
3582 if (blank_state == blank_vesa_wait) {
3583 blank_state = blank_off;
3584 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3585 }
3586 return;
3587 }
3588
3589 /* entering graphics mode? */
3590 if (entering_gfx) {
3591 hide_cursor(vc);
3592 save_screen(vc);
3593 vc->vc_sw->con_blank(vc, -1, 1);
3594 console_blanked = fg_console + 1;
3595 blank_state = blank_off;
3596 set_origin(vc);
3597 return;
3598 }
3599
3600 if (blank_state != blank_normal_wait)
3601 return;
3602 blank_state = blank_off;
3603
3604 /* don't blank graphics */
3605 if (vc->vc_mode != KD_TEXT) {
3606 console_blanked = fg_console + 1;
3607 return;
3608 }
3609
3610 hide_cursor(vc);
3611 del_timer_sync(&console_timer);
3612 blank_timer_expired = 0;
3613
3614 save_screen(vc);
3615 /* In case we need to reset origin, blanking hook returns 1 */
3616 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3617 console_blanked = fg_console + 1;
3618 if (i)
3619 set_origin(vc);
3620
3621 if (console_blank_hook && console_blank_hook(1))
3622 return;
3623
3624 if (vesa_off_interval && vesa_blank_mode) {
3625 blank_state = blank_vesa_wait;
3626 mod_timer(&console_timer, jiffies + vesa_off_interval);
3627 }
3628 }
3629 EXPORT_SYMBOL(do_blank_screen);
3630
3631 /*
3632 * Called by timer as well as from vt_console_driver
3633 */
3634 void do_unblank_screen(int leaving_gfx)
3635 {
3636 struct vc_data *vc;
3637
3638 /* This should now always be called from a "sane" (read: can schedule)
3639 * context for the sake of the low level drivers, except in the special
3640 * case of oops_in_progress
3641 */
3642 if (!oops_in_progress)
3643 might_sleep();
3644
3645 WARN_CONSOLE_UNLOCKED();
3646
3647 ignore_poke = 0;
3648 if (!console_blanked)
3649 return;
3650 if (!vc_cons_allocated(fg_console)) {
3651 /* impossible */
3652 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3653 return;
3654 }
3655 vc = vc_cons[fg_console].d;
3656 if (vc->vc_mode != KD_TEXT)
3657 return; /* but leave console_blanked != 0 */
3658
3659 if (blankinterval) {
3660 mod_timer(&console_timer, jiffies + blankinterval);
3661 blank_state = blank_normal_wait;
3662 }
3663
3664 console_blanked = 0;
3665 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3666 /* Low-level driver cannot restore -> do it ourselves */
3667 update_screen(vc);
3668 if (console_blank_hook)
3669 console_blank_hook(0);
3670 set_palette(vc);
3671 set_cursor(vc);
3672 }
3673 EXPORT_SYMBOL(do_unblank_screen);
3674
3675 /*
3676 * This is called by the outside world to cause a forced unblank, mostly for
3677 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3678 * call it with 1 as an argument and so force a mode restore... that may kill
3679 * X or at least garbage the screen but would also make the Oops visible...
3680 */
3681 void unblank_screen(void)
3682 {
3683 do_unblank_screen(0);
3684 }
3685
3686 /*
3687 * We defer the timer blanking to work queue so it can take the console mutex
3688 * (console operations can still happen at irq time, but only from printk which
3689 * has the console mutex. Not perfect yet, but better than no locking
3690 */
3691 static void blank_screen_t(unsigned long dummy)
3692 {
3693 if (unlikely(!keventd_up())) {
3694 mod_timer(&console_timer, jiffies + blankinterval);
3695 return;
3696 }
3697 blank_timer_expired = 1;
3698 schedule_work(&console_work);
3699 }
3700
3701 void poke_blanked_console(void)
3702 {
3703 WARN_CONSOLE_UNLOCKED();
3704
3705 /* Add this so we quickly catch whoever might call us in a non
3706 * safe context. Nowadays, unblank_screen() isn't to be called in
3707 * atomic contexts and is allowed to schedule (with the special case
3708 * of oops_in_progress, but that isn't of any concern for this
3709 * function. --BenH.
3710 */
3711 might_sleep();
3712
3713 /* This isn't perfectly race free, but a race here would be mostly harmless,
3714 * at worse, we'll do a spurrious blank and it's unlikely
3715 */
3716 del_timer(&console_timer);
3717 blank_timer_expired = 0;
3718
3719 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3720 return;
3721 if (console_blanked)
3722 unblank_screen();
3723 else if (blankinterval) {
3724 mod_timer(&console_timer, jiffies + blankinterval);
3725 blank_state = blank_normal_wait;
3726 }
3727 }
3728
3729 /*
3730 * Palettes
3731 */
3732
3733 static void set_palette(struct vc_data *vc)
3734 {
3735 WARN_CONSOLE_UNLOCKED();
3736
3737 if (vc->vc_mode != KD_GRAPHICS)
3738 vc->vc_sw->con_set_palette(vc, color_table);
3739 }
3740
3741 static int set_get_cmap(unsigned char __user *arg, int set)
3742 {
3743 int i, j, k;
3744
3745 WARN_CONSOLE_UNLOCKED();
3746
3747 for (i = 0; i < 16; i++)
3748 if (set) {
3749 get_user(default_red[i], arg++);
3750 get_user(default_grn[i], arg++);
3751 get_user(default_blu[i], arg++);
3752 } else {
3753 put_user(default_red[i], arg++);
3754 put_user(default_grn[i], arg++);
3755 put_user(default_blu[i], arg++);
3756 }
3757 if (set) {
3758 for (i = 0; i < MAX_NR_CONSOLES; i++)
3759 if (vc_cons_allocated(i)) {
3760 for (j = k = 0; j < 16; j++) {
3761 vc_cons[i].d->vc_palette[k++] = default_red[j];
3762 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3763 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3764 }
3765 set_palette(vc_cons[i].d);
3766 }
3767 }
3768 return 0;
3769 }
3770
3771 /*
3772 * Load palette into the DAC registers. arg points to a colour
3773 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3774 */
3775
3776 int con_set_cmap(unsigned char __user *arg)
3777 {
3778 int rc;
3779
3780 acquire_console_sem();
3781 rc = set_get_cmap (arg,1);
3782 release_console_sem();
3783
3784 return rc;
3785 }
3786
3787 int con_get_cmap(unsigned char __user *arg)
3788 {
3789 int rc;
3790
3791 acquire_console_sem();
3792 rc = set_get_cmap (arg,0);
3793 release_console_sem();
3794
3795 return rc;
3796 }
3797
3798 void reset_palette(struct vc_data *vc)
3799 {
3800 int j, k;
3801 for (j=k=0; j<16; j++) {
3802 vc->vc_palette[k++] = default_red[j];
3803 vc->vc_palette[k++] = default_grn[j];
3804 vc->vc_palette[k++] = default_blu[j];
3805 }
3806 set_palette(vc);
3807 }
3808
3809 /*
3810 * Font switching
3811 *
3812 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3813 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3814 * depending on width) reserved for each character which is kinda wasty, but
3815 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3816 * is upto the actual low-level console-driver convert data into its favorite
3817 * format (maybe we should add a `fontoffset' field to the `display'
3818 * structure so we won't have to convert the fontdata all the time.
3819 * /Jes
3820 */
3821
3822 #define max_font_size 65536
3823
3824 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3825 {
3826 struct console_font font;
3827 int rc = -EINVAL;
3828 int c;
3829
3830 if (vc->vc_mode != KD_TEXT)
3831 return -EINVAL;
3832
3833 if (op->data) {
3834 font.data = kmalloc(max_font_size, GFP_KERNEL);
3835 if (!font.data)
3836 return -ENOMEM;
3837 } else
3838 font.data = NULL;
3839
3840 acquire_console_sem();
3841 if (vc->vc_sw->con_font_get)
3842 rc = vc->vc_sw->con_font_get(vc, &font);
3843 else
3844 rc = -ENOSYS;
3845 release_console_sem();
3846
3847 if (rc)
3848 goto out;
3849
3850 c = (font.width+7)/8 * 32 * font.charcount;
3851
3852 if (op->data && font.charcount > op->charcount)
3853 rc = -ENOSPC;
3854 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3855 if (font.width > op->width || font.height > op->height)
3856 rc = -ENOSPC;
3857 } else {
3858 if (font.width != 8)
3859 rc = -EIO;
3860 else if ((op->height && font.height > op->height) ||
3861 font.height > 32)
3862 rc = -ENOSPC;
3863 }
3864 if (rc)
3865 goto out;
3866
3867 op->height = font.height;
3868 op->width = font.width;
3869 op->charcount = font.charcount;
3870
3871 if (op->data && copy_to_user(op->data, font.data, c))
3872 rc = -EFAULT;
3873
3874 out:
3875 kfree(font.data);
3876 return rc;
3877 }
3878
3879 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3880 {
3881 struct console_font font;
3882 int rc = -EINVAL;
3883 int size;
3884
3885 if (vc->vc_mode != KD_TEXT)
3886 return -EINVAL;
3887 if (!op->data)
3888 return -EINVAL;
3889 if (op->charcount > 512)
3890 return -EINVAL;
3891 if (!op->height) { /* Need to guess font height [compat] */
3892 int h, i;
3893 u8 __user *charmap = op->data;
3894 u8 tmp;
3895
3896 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3897 so that we can get rid of this soon */
3898 if (!(op->flags & KD_FONT_FLAG_OLD))
3899 return -EINVAL;
3900 for (h = 32; h > 0; h--)
3901 for (i = 0; i < op->charcount; i++) {
3902 if (get_user(tmp, &charmap[32*i+h-1]))
3903 return -EFAULT;
3904 if (tmp)
3905 goto nonzero;
3906 }
3907 return -EINVAL;
3908 nonzero:
3909 op->height = h;
3910 }
3911 if (op->width <= 0 || op->width > 32 || op->height > 32)
3912 return -EINVAL;
3913 size = (op->width+7)/8 * 32 * op->charcount;
3914 if (size > max_font_size)
3915 return -ENOSPC;
3916 font.charcount = op->charcount;
3917 font.height = op->height;
3918 font.width = op->width;
3919 font.data = kmalloc(size, GFP_KERNEL);
3920 if (!font.data)
3921 return -ENOMEM;
3922 if (copy_from_user(font.data, op->data, size)) {
3923 kfree(font.data);
3924 return -EFAULT;
3925 }
3926 acquire_console_sem();
3927 if (vc->vc_sw->con_font_set)
3928 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3929 else
3930 rc = -ENOSYS;
3931 release_console_sem();
3932 kfree(font.data);
3933 return rc;
3934 }
3935
3936 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3937 {
3938 struct console_font font = {.width = op->width, .height = op->height};
3939 char name[MAX_FONT_NAME];
3940 char *s = name;
3941 int rc;
3942
3943 if (vc->vc_mode != KD_TEXT)
3944 return -EINVAL;
3945
3946 if (!op->data)
3947 s = NULL;
3948 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3949 return -EFAULT;
3950 else
3951 name[MAX_FONT_NAME - 1] = 0;
3952
3953 acquire_console_sem();
3954 if (vc->vc_sw->con_font_default)
3955 rc = vc->vc_sw->con_font_default(vc, &font, s);
3956 else
3957 rc = -ENOSYS;
3958 release_console_sem();
3959 if (!rc) {
3960 op->width = font.width;
3961 op->height = font.height;
3962 }
3963 return rc;
3964 }
3965
3966 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3967 {
3968 int con = op->height;
3969 int rc;
3970
3971 if (vc->vc_mode != KD_TEXT)
3972 return -EINVAL;
3973
3974 acquire_console_sem();
3975 if (!vc->vc_sw->con_font_copy)
3976 rc = -ENOSYS;
3977 else if (con < 0 || !vc_cons_allocated(con))
3978 rc = -ENOTTY;
3979 else if (con == vc->vc_num) /* nothing to do */
3980 rc = 0;
3981 else
3982 rc = vc->vc_sw->con_font_copy(vc, con);
3983 release_console_sem();
3984 return rc;
3985 }
3986
3987 int con_font_op(struct vc_data *vc, struct console_font_op *op)
3988 {
3989 switch (op->op) {
3990 case KD_FONT_OP_SET:
3991 return con_font_set(vc, op);
3992 case KD_FONT_OP_GET:
3993 return con_font_get(vc, op);
3994 case KD_FONT_OP_SET_DEFAULT:
3995 return con_font_default(vc, op);
3996 case KD_FONT_OP_COPY:
3997 return con_font_copy(vc, op);
3998 }
3999 return -ENOSYS;
4000 }
4001
4002 /*
4003 * Interface exported to selection and vcs.
4004 */
4005
4006 /* used by selection */
4007 u16 screen_glyph(struct vc_data *vc, int offset)
4008 {
4009 u16 w = scr_readw(screenpos(vc, offset, 1));
4010 u16 c = w & 0xff;
4011
4012 if (w & vc->vc_hi_font_mask)
4013 c |= 0x100;
4014 return c;
4015 }
4016 EXPORT_SYMBOL_GPL(screen_glyph);
4017
4018 /* used by vcs - note the word offset */
4019 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4020 {
4021 return screenpos(vc, 2 * w_offset, viewed);
4022 }
4023
4024 void getconsxy(struct vc_data *vc, unsigned char *p)
4025 {
4026 p[0] = vc->vc_x;
4027 p[1] = vc->vc_y;
4028 }
4029
4030 void putconsxy(struct vc_data *vc, unsigned char *p)
4031 {
4032 hide_cursor(vc);
4033 gotoxy(vc, p[0], p[1]);
4034 set_cursor(vc);
4035 }
4036
4037 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4038 {
4039 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4040 return softcursor_original;
4041 return scr_readw(org);
4042 }
4043
4044 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4045 {
4046 scr_writew(val, org);
4047 if ((unsigned long)org == vc->vc_pos) {
4048 softcursor_original = -1;
4049 add_softcursor(vc);
4050 }
4051 }
4052
4053 /*
4054 * Visible symbols for modules
4055 */
4056
4057 EXPORT_SYMBOL(color_table);
4058 EXPORT_SYMBOL(default_red);
4059 EXPORT_SYMBOL(default_grn);
4060 EXPORT_SYMBOL(default_blu);
4061 EXPORT_SYMBOL(update_region);
4062 EXPORT_SYMBOL(redraw_screen);
4063 EXPORT_SYMBOL(vc_resize);
4064 EXPORT_SYMBOL(vc_lock_resize);
4065 EXPORT_SYMBOL(fg_console);
4066 EXPORT_SYMBOL(console_blank_hook);
4067 EXPORT_SYMBOL(console_blanked);
4068 EXPORT_SYMBOL(vc_cons);
4069 #ifndef VT_SINGLE_DRIVER
4070 EXPORT_SYMBOL(take_over_console);
4071 EXPORT_SYMBOL(give_up_console);
4072 #endif
Support for the Chinese Samsung S3C2440 based development boards