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PCI PM: Avoid touching devices behind bridges in unknown state
[linux-2.6/verdex.git] / drivers / char / vt.c
blob80014213fb5397a7c7694e5b4c023b6e308bb197
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/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 #include <linux/device.h>
104 #include <linux/io.h>
105 #include <asm/system.h>
106 #include <linux/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164
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_video_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_video_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 }
438
439 /* Note: inverting the screen twice should revert to the original state */
440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
441 {
442 unsigned short *p;
443
444 WARN_CONSOLE_UNLOCKED();
445
446 count /= 2;
447 p = screenpos(vc, offset, viewed);
448 if (vc->vc_sw->con_invert_region)
449 vc->vc_sw->con_invert_region(vc, p, count);
450 #ifndef VT_BUF_VRAM_ONLY
451 else {
452 u16 *q = p;
453 int cnt = count;
454 u16 a;
455
456 if (!vc->vc_can_do_color) {
457 while (cnt--) {
458 a = scr_readw(q);
459 a ^= 0x0800;
460 scr_writew(a, q);
461 q++;
462 }
463 } else if (vc->vc_hi_font_mask == 0x100) {
464 while (cnt--) {
465 a = scr_readw(q);
466 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
467 scr_writew(a, q);
468 q++;
469 }
470 } else {
471 while (cnt--) {
472 a = scr_readw(q);
473 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
474 scr_writew(a, q);
475 q++;
476 }
477 }
478 }
479 #endif
480 if (DO_UPDATE(vc))
481 do_update_region(vc, (unsigned long) p, count);
482 }
483
484 /* used by selection: complement pointer position */
485 void complement_pos(struct vc_data *vc, int offset)
486 {
487 static int old_offset = -1;
488 static unsigned short old;
489 static unsigned short oldx, oldy;
490
491 WARN_CONSOLE_UNLOCKED();
492
493 if (old_offset != -1 && old_offset >= 0 &&
494 old_offset < vc->vc_screenbuf_size) {
495 scr_writew(old, screenpos(vc, old_offset, 1));
496 if (DO_UPDATE(vc))
497 vc->vc_sw->con_putc(vc, old, oldy, oldx);
498 }
499
500 old_offset = offset;
501
502 if (offset != -1 && offset >= 0 &&
503 offset < vc->vc_screenbuf_size) {
504 unsigned short new;
505 unsigned short *p;
506 p = screenpos(vc, offset, 1);
507 old = scr_readw(p);
508 new = old ^ vc->vc_complement_mask;
509 scr_writew(new, p);
510 if (DO_UPDATE(vc)) {
511 oldx = (offset >> 1) % vc->vc_cols;
512 oldy = (offset >> 1) / vc->vc_cols;
513 vc->vc_sw->con_putc(vc, new, oldy, oldx);
514 }
515 }
516
517 }
518
519 static void insert_char(struct vc_data *vc, unsigned int nr)
520 {
521 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
522
523 p = q + vc->vc_cols - nr - vc->vc_x;
524 while (--p >= q)
525 scr_writew(scr_readw(p), p + nr);
526 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
527 vc->vc_need_wrap = 0;
528 if (DO_UPDATE(vc)) {
529 unsigned short oldattr = vc->vc_attr;
530 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
531 vc->vc_cols - vc->vc_x - nr);
532 vc->vc_attr = vc->vc_video_erase_char >> 8;
533 while (nr--)
534 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
535 vc->vc_attr = oldattr;
536 }
537 }
538
539 static void delete_char(struct vc_data *vc, unsigned int nr)
540 {
541 unsigned int i = vc->vc_x;
542 unsigned short *p = (unsigned short *)vc->vc_pos;
543
544 while (++i <= vc->vc_cols - nr) {
545 scr_writew(scr_readw(p+nr), p);
546 p++;
547 }
548 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
549 vc->vc_need_wrap = 0;
550 if (DO_UPDATE(vc)) {
551 unsigned short oldattr = vc->vc_attr;
552 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
553 vc->vc_cols - vc->vc_x - nr);
554 vc->vc_attr = vc->vc_video_erase_char >> 8;
555 while (nr--)
556 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
557 vc->vc_cols - 1 - nr);
558 vc->vc_attr = oldattr;
559 }
560 }
561
562 static int softcursor_original;
563
564 static void add_softcursor(struct vc_data *vc)
565 {
566 int i = scr_readw((u16 *) vc->vc_pos);
567 u32 type = vc->vc_cursor_type;
568
569 if (! (type & 0x10)) return;
570 if (softcursor_original != -1) return;
571 softcursor_original = i;
572 i |= ((type >> 8) & 0xff00 );
573 i ^= ((type) & 0xff00 );
574 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
575 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
576 scr_writew(i, (u16 *) vc->vc_pos);
577 if (DO_UPDATE(vc))
578 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
579 }
580
581 static void hide_softcursor(struct vc_data *vc)
582 {
583 if (softcursor_original != -1) {
584 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
585 if (DO_UPDATE(vc))
586 vc->vc_sw->con_putc(vc, softcursor_original,
587 vc->vc_y, vc->vc_x);
588 softcursor_original = -1;
589 }
590 }
591
592 static void hide_cursor(struct vc_data *vc)
593 {
594 if (vc == sel_cons)
595 clear_selection();
596 vc->vc_sw->con_cursor(vc, CM_ERASE);
597 hide_softcursor(vc);
598 }
599
600 static void set_cursor(struct vc_data *vc)
601 {
602 if (!IS_FG(vc) || console_blanked ||
603 vc->vc_mode == KD_GRAPHICS)
604 return;
605 if (vc->vc_deccm) {
606 if (vc == sel_cons)
607 clear_selection();
608 add_softcursor(vc);
609 if ((vc->vc_cursor_type & 0x0f) != 1)
610 vc->vc_sw->con_cursor(vc, CM_DRAW);
611 } else
612 hide_cursor(vc);
613 }
614
615 static void set_origin(struct vc_data *vc)
616 {
617 WARN_CONSOLE_UNLOCKED();
618
619 if (!CON_IS_VISIBLE(vc) ||
620 !vc->vc_sw->con_set_origin ||
621 !vc->vc_sw->con_set_origin(vc))
622 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
623 vc->vc_visible_origin = vc->vc_origin;
624 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
625 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
626 }
627
628 static inline void save_screen(struct vc_data *vc)
629 {
630 WARN_CONSOLE_UNLOCKED();
631
632 if (vc->vc_sw->con_save_screen)
633 vc->vc_sw->con_save_screen(vc);
634 }
635
636 /*
637 * Redrawing of screen
638 */
639
640 static void clear_buffer_attributes(struct vc_data *vc)
641 {
642 unsigned short *p = (unsigned short *)vc->vc_origin;
643 int count = vc->vc_screenbuf_size / 2;
644 int mask = vc->vc_hi_font_mask | 0xff;
645
646 for (; count > 0; count--, p++) {
647 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
648 }
649 }
650
651 void redraw_screen(struct vc_data *vc, int is_switch)
652 {
653 int redraw = 0;
654
655 WARN_CONSOLE_UNLOCKED();
656
657 if (!vc) {
658 /* strange ... */
659 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
660 return;
661 }
662
663 if (is_switch) {
664 struct vc_data *old_vc = vc_cons[fg_console].d;
665 if (old_vc == vc)
666 return;
667 if (!CON_IS_VISIBLE(vc))
668 redraw = 1;
669 *vc->vc_display_fg = vc;
670 fg_console = vc->vc_num;
671 hide_cursor(old_vc);
672 if (!CON_IS_VISIBLE(old_vc)) {
673 save_screen(old_vc);
674 set_origin(old_vc);
675 }
676 } else {
677 hide_cursor(vc);
678 redraw = 1;
679 }
680
681 if (redraw) {
682 int update;
683 int old_was_color = vc->vc_can_do_color;
684
685 set_origin(vc);
686 update = vc->vc_sw->con_switch(vc);
687 set_palette(vc);
688 /*
689 * If console changed from mono<->color, the best we can do
690 * is to clear the buffer attributes. As it currently stands,
691 * rebuilding new attributes from the old buffer is not doable
692 * without overly complex code.
693 */
694 if (old_was_color != vc->vc_can_do_color) {
695 update_attr(vc);
696 clear_buffer_attributes(vc);
697 }
698 if (update && vc->vc_mode != KD_GRAPHICS)
699 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
700 }
701 set_cursor(vc);
702 if (is_switch) {
703 set_leds();
704 compute_shiftstate();
705 notify_update(vc);
706 }
707 }
708
709 /*
710 * Allocation, freeing and resizing of VTs.
711 */
712
713 int vc_cons_allocated(unsigned int i)
714 {
715 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
716 }
717
718 static void visual_init(struct vc_data *vc, int num, int init)
719 {
720 /* ++Geert: vc->vc_sw->con_init determines console size */
721 if (vc->vc_sw)
722 module_put(vc->vc_sw->owner);
723 vc->vc_sw = conswitchp;
724 #ifndef VT_SINGLE_DRIVER
725 if (con_driver_map[num])
726 vc->vc_sw = con_driver_map[num];
727 #endif
728 __module_get(vc->vc_sw->owner);
729 vc->vc_num = num;
730 vc->vc_display_fg = &master_display_fg;
731 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
732 vc->vc_uni_pagedir = 0;
733 vc->vc_hi_font_mask = 0;
734 vc->vc_complement_mask = 0;
735 vc->vc_can_do_color = 0;
736 vc->vc_sw->con_init(vc, init);
737 if (!vc->vc_complement_mask)
738 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
739 vc->vc_s_complement_mask = vc->vc_complement_mask;
740 vc->vc_size_row = vc->vc_cols << 1;
741 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
742 }
743
744 int vc_allocate(unsigned int currcons) /* return 0 on success */
745 {
746 WARN_CONSOLE_UNLOCKED();
747
748 if (currcons >= MAX_NR_CONSOLES)
749 return -ENXIO;
750 if (!vc_cons[currcons].d) {
751 struct vc_data *vc;
752 struct vt_notifier_param param;
753
754 /* prevent users from taking too much memory */
755 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
756 return -EPERM;
757
758 /* due to the granularity of kmalloc, we waste some memory here */
759 /* the alloc is done in two steps, to optimize the common situation
760 of a 25x80 console (structsize=216, screenbuf_size=4000) */
761 /* although the numbers above are not valid since long ago, the
762 point is still up-to-date and the comment still has its value
763 even if only as a historical artifact. --mj, July 1998 */
764 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
765 if (!vc)
766 return -ENOMEM;
767 vc_cons[currcons].d = vc;
768 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
769 visual_init(vc, currcons, 1);
770 if (!*vc->vc_uni_pagedir_loc)
771 con_set_default_unimap(vc);
772 if (!vc->vc_kmalloced)
773 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
774 if (!vc->vc_screenbuf) {
775 kfree(vc);
776 vc_cons[currcons].d = NULL;
777 return -ENOMEM;
778 }
779 vc->vc_kmalloced = 1;
780 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
781 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
782 }
783 return 0;
784 }
785
786 static inline int resize_screen(struct vc_data *vc, int width, int height,
787 int user)
788 {
789 /* Resizes the resolution of the display adapater */
790 int err = 0;
791
792 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
793 err = vc->vc_sw->con_resize(vc, width, height, user);
794
795 return err;
796 }
797
798 /*
799 * Change # of rows and columns (0 means unchanged/the size of fg_console)
800 * [this is to be used together with some user program
801 * like resize that changes the hardware videomode]
802 */
803 #define VC_RESIZE_MAXCOL (32767)
804 #define VC_RESIZE_MAXROW (32767)
805
806 /**
807 * vc_do_resize - resizing method for the tty
808 * @tty: tty being resized
809 * @real_tty: real tty (different to tty if a pty/tty pair)
810 * @vc: virtual console private data
811 * @cols: columns
812 * @lines: lines
813 *
814 * Resize a virtual console, clipping according to the actual constraints.
815 * If the caller passes a tty structure then update the termios winsize
816 * information and perform any neccessary signal handling.
817 *
818 * Caller must hold the console semaphore. Takes the termios mutex and
819 * ctrl_lock of the tty IFF a tty is passed.
820 */
821
822 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
823 unsigned int cols, unsigned int lines)
824 {
825 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
826 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
827 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
828 unsigned int end, user;
829 unsigned short *newscreen;
830
831 WARN_CONSOLE_UNLOCKED();
832
833 if (!vc)
834 return -ENXIO;
835
836 user = vc->vc_resize_user;
837 vc->vc_resize_user = 0;
838
839 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
840 return -EINVAL;
841
842 new_cols = (cols ? cols : vc->vc_cols);
843 new_rows = (lines ? lines : vc->vc_rows);
844 new_row_size = new_cols << 1;
845 new_screen_size = new_row_size * new_rows;
846
847 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
848 return 0;
849
850 newscreen = kmalloc(new_screen_size, GFP_USER);
851 if (!newscreen)
852 return -ENOMEM;
853
854 old_rows = vc->vc_rows;
855 old_cols = vc->vc_cols;
856 old_row_size = vc->vc_size_row;
857 old_screen_size = vc->vc_screenbuf_size;
858
859 err = resize_screen(vc, new_cols, new_rows, user);
860 if (err) {
861 kfree(newscreen);
862 return err;
863 }
864
865 vc->vc_rows = new_rows;
866 vc->vc_cols = new_cols;
867 vc->vc_size_row = new_row_size;
868 vc->vc_screenbuf_size = new_screen_size;
869
870 rlth = min(old_row_size, new_row_size);
871 rrem = new_row_size - rlth;
872 old_origin = vc->vc_origin;
873 new_origin = (long) newscreen;
874 new_scr_end = new_origin + new_screen_size;
875
876 if (vc->vc_y > new_rows) {
877 if (old_rows - vc->vc_y < new_rows) {
878 /*
879 * Cursor near the bottom, copy contents from the
880 * bottom of buffer
881 */
882 old_origin += (old_rows - new_rows) * old_row_size;
883 end = vc->vc_scr_end;
884 } else {
885 /*
886 * Cursor is in no man's land, copy 1/2 screenful
887 * from the top and bottom of cursor position
888 */
889 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
890 end = old_origin + (old_row_size * new_rows);
891 }
892 } else
893 /*
894 * Cursor near the top, copy contents from the top of buffer
895 */
896 end = (old_rows > new_rows) ? old_origin +
897 (old_row_size * new_rows) :
898 vc->vc_scr_end;
899
900 update_attr(vc);
901
902 while (old_origin < end) {
903 scr_memcpyw((unsigned short *) new_origin,
904 (unsigned short *) old_origin, rlth);
905 if (rrem)
906 scr_memsetw((void *)(new_origin + rlth),
907 vc->vc_video_erase_char, rrem);
908 old_origin += old_row_size;
909 new_origin += new_row_size;
910 }
911 if (new_scr_end > new_origin)
912 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
913 new_scr_end - new_origin);
914 if (vc->vc_kmalloced)
915 kfree(vc->vc_screenbuf);
916 vc->vc_screenbuf = newscreen;
917 vc->vc_kmalloced = 1;
918 vc->vc_screenbuf_size = new_screen_size;
919 set_origin(vc);
920
921 /* do part of a reset_terminal() */
922 vc->vc_top = 0;
923 vc->vc_bottom = vc->vc_rows;
924 gotoxy(vc, vc->vc_x, vc->vc_y);
925 save_cur(vc);
926
927 if (tty) {
928 /* Rewrite the requested winsize data with the actual
929 resulting sizes */
930 struct winsize ws;
931 memset(&ws, 0, sizeof(ws));
932 ws.ws_row = vc->vc_rows;
933 ws.ws_col = vc->vc_cols;
934 ws.ws_ypixel = vc->vc_scan_lines;
935 tty_do_resize(tty, &ws);
936 }
937
938 if (CON_IS_VISIBLE(vc))
939 update_screen(vc);
940 return err;
941 }
942
943 /**
944 * vc_resize - resize a VT
945 * @vc: virtual console
946 * @cols: columns
947 * @rows: rows
948 *
949 * Resize a virtual console as seen from the console end of things. We
950 * use the common vc_do_resize methods to update the structures. The
951 * caller must hold the console sem to protect console internals and
952 * vc->vc_tty
953 */
954
955 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
956 {
957 return vc_do_resize(vc->vc_tty, vc, cols, rows);
958 }
959
960 /**
961 * vt_resize - resize a VT
962 * @tty: tty to resize
963 * @ws: winsize attributes
964 *
965 * Resize a virtual terminal. This is called by the tty layer as we
966 * register our own handler for resizing. The mutual helper does all
967 * the actual work.
968 *
969 * Takes the console sem and the called methods then take the tty
970 * termios_mutex and the tty ctrl_lock in that order.
971 */
972
973 int vt_resize(struct tty_struct *tty, struct winsize *ws)
974 {
975 struct vc_data *vc = tty->driver_data;
976 int ret;
977
978 acquire_console_sem();
979 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
980 release_console_sem();
981 return ret;
982 }
983
984 void vc_deallocate(unsigned int currcons)
985 {
986 WARN_CONSOLE_UNLOCKED();
987
988 if (vc_cons_allocated(currcons)) {
989 struct vc_data *vc = vc_cons[currcons].d;
990 struct vt_notifier_param param = { .vc = vc };
991 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
992 vc->vc_sw->con_deinit(vc);
993 put_pid(vc->vt_pid);
994 module_put(vc->vc_sw->owner);
995 if (vc->vc_kmalloced)
996 kfree(vc->vc_screenbuf);
997 if (currcons >= MIN_NR_CONSOLES)
998 kfree(vc);
999 vc_cons[currcons].d = NULL;
1000 }
1001 }
1002
1003 /*
1004 * VT102 emulator
1005 */
1006
1007 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1008 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1009 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1010
1011 #define decarm VC_REPEAT
1012 #define decckm VC_CKMODE
1013 #define kbdapplic VC_APPLIC
1014 #define lnm VC_CRLF
1015
1016 /*
1017 * this is what the terminal answers to a ESC-Z or csi0c query.
1018 */
1019 #define VT100ID "\033[?1;2c"
1020 #define VT102ID "\033[?6c"
1021
1022 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1023 8,12,10,14, 9,13,11,15 };
1024
1025 /* the default colour table, for VGA+ colour systems */
1026 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1027 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1028 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1029 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1030 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1031 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1032
1033 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1034 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1035 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1036
1037 /*
1038 * gotoxy() must verify all boundaries, because the arguments
1039 * might also be negative. If the given position is out of
1040 * bounds, the cursor is placed at the nearest margin.
1041 */
1042 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1043 {
1044 int min_y, max_y;
1045
1046 if (new_x < 0)
1047 vc->vc_x = 0;
1048 else {
1049 if (new_x >= vc->vc_cols)
1050 vc->vc_x = vc->vc_cols - 1;
1051 else
1052 vc->vc_x = new_x;
1053 }
1054
1055 if (vc->vc_decom) {
1056 min_y = vc->vc_top;
1057 max_y = vc->vc_bottom;
1058 } else {
1059 min_y = 0;
1060 max_y = vc->vc_rows;
1061 }
1062 if (new_y < min_y)
1063 vc->vc_y = min_y;
1064 else if (new_y >= max_y)
1065 vc->vc_y = max_y - 1;
1066 else
1067 vc->vc_y = new_y;
1068 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1069 vc->vc_need_wrap = 0;
1070 }
1071
1072 /* for absolute user moves, when decom is set */
1073 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1074 {
1075 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1076 }
1077
1078 void scrollback(struct vc_data *vc, int lines)
1079 {
1080 if (!lines)
1081 lines = vc->vc_rows / 2;
1082 scrolldelta(-lines);
1083 }
1084
1085 void scrollfront(struct vc_data *vc, int lines)
1086 {
1087 if (!lines)
1088 lines = vc->vc_rows / 2;
1089 scrolldelta(lines);
1090 }
1091
1092 static void lf(struct vc_data *vc)
1093 {
1094 /* don't scroll if above bottom of scrolling region, or
1095 * if below scrolling region
1096 */
1097 if (vc->vc_y + 1 == vc->vc_bottom)
1098 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1099 else if (vc->vc_y < vc->vc_rows - 1) {
1100 vc->vc_y++;
1101 vc->vc_pos += vc->vc_size_row;
1102 }
1103 vc->vc_need_wrap = 0;
1104 notify_write(vc, '\n');
1105 }
1106
1107 static void ri(struct vc_data *vc)
1108 {
1109 /* don't scroll if below top of scrolling region, or
1110 * if above scrolling region
1111 */
1112 if (vc->vc_y == vc->vc_top)
1113 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1114 else if (vc->vc_y > 0) {
1115 vc->vc_y--;
1116 vc->vc_pos -= vc->vc_size_row;
1117 }
1118 vc->vc_need_wrap = 0;
1119 }
1120
1121 static inline void cr(struct vc_data *vc)
1122 {
1123 vc->vc_pos -= vc->vc_x << 1;
1124 vc->vc_need_wrap = vc->vc_x = 0;
1125 notify_write(vc, '\r');
1126 }
1127
1128 static inline void bs(struct vc_data *vc)
1129 {
1130 if (vc->vc_x) {
1131 vc->vc_pos -= 2;
1132 vc->vc_x--;
1133 vc->vc_need_wrap = 0;
1134 notify_write(vc, '\b');
1135 }
1136 }
1137
1138 static inline void del(struct vc_data *vc)
1139 {
1140 /* ignored */
1141 }
1142
1143 static void csi_J(struct vc_data *vc, int vpar)
1144 {
1145 unsigned int count;
1146 unsigned short * start;
1147
1148 switch (vpar) {
1149 case 0: /* erase from cursor to end of display */
1150 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1151 start = (unsigned short *)vc->vc_pos;
1152 if (DO_UPDATE(vc)) {
1153 /* do in two stages */
1154 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1155 vc->vc_cols - vc->vc_x);
1156 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1157 vc->vc_rows - vc->vc_y - 1,
1158 vc->vc_cols);
1159 }
1160 break;
1161 case 1: /* erase from start to cursor */
1162 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163 start = (unsigned short *)vc->vc_origin;
1164 if (DO_UPDATE(vc)) {
1165 /* do in two stages */
1166 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1167 vc->vc_cols);
1168 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1169 vc->vc_x + 1);
1170 }
1171 break;
1172 case 2: /* erase whole display */
1173 count = vc->vc_cols * vc->vc_rows;
1174 start = (unsigned short *)vc->vc_origin;
1175 if (DO_UPDATE(vc))
1176 vc->vc_sw->con_clear(vc, 0, 0,
1177 vc->vc_rows,
1178 vc->vc_cols);
1179 break;
1180 default:
1181 return;
1182 }
1183 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1184 vc->vc_need_wrap = 0;
1185 }
1186
1187 static void csi_K(struct vc_data *vc, int vpar)
1188 {
1189 unsigned int count;
1190 unsigned short * start;
1191
1192 switch (vpar) {
1193 case 0: /* erase from cursor to end of line */
1194 count = vc->vc_cols - vc->vc_x;
1195 start = (unsigned short *)vc->vc_pos;
1196 if (DO_UPDATE(vc))
1197 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1198 vc->vc_cols - vc->vc_x);
1199 break;
1200 case 1: /* erase from start of line to cursor */
1201 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1202 count = vc->vc_x + 1;
1203 if (DO_UPDATE(vc))
1204 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1205 vc->vc_x + 1);
1206 break;
1207 case 2: /* erase whole line */
1208 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209 count = vc->vc_cols;
1210 if (DO_UPDATE(vc))
1211 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1212 vc->vc_cols);
1213 break;
1214 default:
1215 return;
1216 }
1217 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1218 vc->vc_need_wrap = 0;
1219 }
1220
1221 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1222 { /* not vt100? */
1223 int count;
1224
1225 if (!vpar)
1226 vpar++;
1227 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1228
1229 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1230 if (DO_UPDATE(vc))
1231 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1232 vc->vc_need_wrap = 0;
1233 }
1234
1235 static void default_attr(struct vc_data *vc)
1236 {
1237 vc->vc_intensity = 1;
1238 vc->vc_italic = 0;
1239 vc->vc_underline = 0;
1240 vc->vc_reverse = 0;
1241 vc->vc_blink = 0;
1242 vc->vc_color = vc->vc_def_color;
1243 }
1244
1245 /* console_sem is held */
1246 static void csi_m(struct vc_data *vc)
1247 {
1248 int i;
1249
1250 for (i = 0; i <= vc->vc_npar; i++)
1251 switch (vc->vc_par[i]) {
1252 case 0: /* all attributes off */
1253 default_attr(vc);
1254 break;
1255 case 1:
1256 vc->vc_intensity = 2;
1257 break;
1258 case 2:
1259 vc->vc_intensity = 0;
1260 break;
1261 case 3:
1262 vc->vc_italic = 1;
1263 break;
1264 case 4:
1265 vc->vc_underline = 1;
1266 break;
1267 case 5:
1268 vc->vc_blink = 1;
1269 break;
1270 case 7:
1271 vc->vc_reverse = 1;
1272 break;
1273 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1274 * Select primary font, don't display
1275 * control chars if defined, don't set
1276 * bit 8 on output.
1277 */
1278 vc->vc_translate = set_translate(vc->vc_charset == 0
1279 ? vc->vc_G0_charset
1280 : vc->vc_G1_charset, vc);
1281 vc->vc_disp_ctrl = 0;
1282 vc->vc_toggle_meta = 0;
1283 break;
1284 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1285 * Select first alternate font, lets
1286 * chars < 32 be displayed as ROM chars.
1287 */
1288 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1289 vc->vc_disp_ctrl = 1;
1290 vc->vc_toggle_meta = 0;
1291 break;
1292 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1293 * Select second alternate font, toggle
1294 * high bit before displaying as ROM char.
1295 */
1296 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1297 vc->vc_disp_ctrl = 1;
1298 vc->vc_toggle_meta = 1;
1299 break;
1300 case 21:
1301 case 22:
1302 vc->vc_intensity = 1;
1303 break;
1304 case 23:
1305 vc->vc_italic = 0;
1306 break;
1307 case 24:
1308 vc->vc_underline = 0;
1309 break;
1310 case 25:
1311 vc->vc_blink = 0;
1312 break;
1313 case 27:
1314 vc->vc_reverse = 0;
1315 break;
1316 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1317 * Enables underscore, white foreground
1318 * with white underscore (Linux - use
1319 * default foreground).
1320 */
1321 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1322 vc->vc_underline = 1;
1323 break;
1324 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1325 * Disable underline option.
1326 * Reset colour to default? It did this
1327 * before...
1328 */
1329 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1330 vc->vc_underline = 0;
1331 break;
1332 case 49:
1333 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1334 break;
1335 default:
1336 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1337 vc->vc_color = color_table[vc->vc_par[i] - 30]
1338 | (vc->vc_color & 0xf0);
1339 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1340 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1341 | (vc->vc_color & 0x0f);
1342 break;
1343 }
1344 update_attr(vc);
1345 }
1346
1347 static void respond_string(const char *p, struct tty_struct *tty)
1348 {
1349 while (*p) {
1350 tty_insert_flip_char(tty, *p, 0);
1351 p++;
1352 }
1353 con_schedule_flip(tty);
1354 }
1355
1356 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1357 {
1358 char buf[40];
1359
1360 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1361 respond_string(buf, tty);
1362 }
1363
1364 static inline void status_report(struct tty_struct *tty)
1365 {
1366 respond_string("\033[0n", tty); /* Terminal ok */
1367 }
1368
1369 static inline void respond_ID(struct tty_struct * tty)
1370 {
1371 respond_string(VT102ID, tty);
1372 }
1373
1374 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1375 {
1376 char buf[8];
1377
1378 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1379 (char)('!' + mry));
1380 respond_string(buf, tty);
1381 }
1382
1383 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1384 int mouse_reporting(void)
1385 {
1386 return vc_cons[fg_console].d->vc_report_mouse;
1387 }
1388
1389 /* console_sem is held */
1390 static void set_mode(struct vc_data *vc, int on_off)
1391 {
1392 int i;
1393
1394 for (i = 0; i <= vc->vc_npar; i++)
1395 if (vc->vc_ques) {
1396 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1397 case 1: /* Cursor keys send ^[Ox/^[[x */
1398 if (on_off)
1399 set_kbd(vc, decckm);
1400 else
1401 clr_kbd(vc, decckm);
1402 break;
1403 case 3: /* 80/132 mode switch unimplemented */
1404 vc->vc_deccolm = on_off;
1405 #if 0
1406 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1407 /* this alone does not suffice; some user mode
1408 utility has to change the hardware regs */
1409 #endif
1410 break;
1411 case 5: /* Inverted screen on/off */
1412 if (vc->vc_decscnm != on_off) {
1413 vc->vc_decscnm = on_off;
1414 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1415 update_attr(vc);
1416 }
1417 break;
1418 case 6: /* Origin relative/absolute */
1419 vc->vc_decom = on_off;
1420 gotoxay(vc, 0, 0);
1421 break;
1422 case 7: /* Autowrap on/off */
1423 vc->vc_decawm = on_off;
1424 break;
1425 case 8: /* Autorepeat on/off */
1426 if (on_off)
1427 set_kbd(vc, decarm);
1428 else
1429 clr_kbd(vc, decarm);
1430 break;
1431 case 9:
1432 vc->vc_report_mouse = on_off ? 1 : 0;
1433 break;
1434 case 25: /* Cursor on/off */
1435 vc->vc_deccm = on_off;
1436 break;
1437 case 1000:
1438 vc->vc_report_mouse = on_off ? 2 : 0;
1439 break;
1440 }
1441 } else {
1442 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1443 case 3: /* Monitor (display ctrls) */
1444 vc->vc_disp_ctrl = on_off;
1445 break;
1446 case 4: /* Insert Mode on/off */
1447 vc->vc_decim = on_off;
1448 break;
1449 case 20: /* Lf, Enter == CrLf/Lf */
1450 if (on_off)
1451 set_kbd(vc, lnm);
1452 else
1453 clr_kbd(vc, lnm);
1454 break;
1455 }
1456 }
1457 }
1458
1459 /* console_sem is held */
1460 static void setterm_command(struct vc_data *vc)
1461 {
1462 switch(vc->vc_par[0]) {
1463 case 1: /* set color for underline mode */
1464 if (vc->vc_can_do_color &&
1465 vc->vc_par[1] < 16) {
1466 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1467 if (vc->vc_underline)
1468 update_attr(vc);
1469 }
1470 break;
1471 case 2: /* set color for half intensity mode */
1472 if (vc->vc_can_do_color &&
1473 vc->vc_par[1] < 16) {
1474 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1475 if (vc->vc_intensity == 0)
1476 update_attr(vc);
1477 }
1478 break;
1479 case 8: /* store colors as defaults */
1480 vc->vc_def_color = vc->vc_attr;
1481 if (vc->vc_hi_font_mask == 0x100)
1482 vc->vc_def_color >>= 1;
1483 default_attr(vc);
1484 update_attr(vc);
1485 break;
1486 case 9: /* set blanking interval */
1487 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1488 poke_blanked_console();
1489 break;
1490 case 10: /* set bell frequency in Hz */
1491 if (vc->vc_npar >= 1)
1492 vc->vc_bell_pitch = vc->vc_par[1];
1493 else
1494 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1495 break;
1496 case 11: /* set bell duration in msec */
1497 if (vc->vc_npar >= 1)
1498 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1499 vc->vc_par[1] * HZ / 1000 : 0;
1500 else
1501 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1502 break;
1503 case 12: /* bring specified console to the front */
1504 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1505 set_console(vc->vc_par[1] - 1);
1506 break;
1507 case 13: /* unblank the screen */
1508 poke_blanked_console();
1509 break;
1510 case 14: /* set vesa powerdown interval */
1511 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1512 break;
1513 case 15: /* activate the previous console */
1514 set_console(last_console);
1515 break;
1516 }
1517 }
1518
1519 /* console_sem is held */
1520 static void csi_at(struct vc_data *vc, unsigned int nr)
1521 {
1522 if (nr > vc->vc_cols - vc->vc_x)
1523 nr = vc->vc_cols - vc->vc_x;
1524 else if (!nr)
1525 nr = 1;
1526 insert_char(vc, nr);
1527 }
1528
1529 /* console_sem is held */
1530 static void csi_L(struct vc_data *vc, unsigned int nr)
1531 {
1532 if (nr > vc->vc_rows - vc->vc_y)
1533 nr = vc->vc_rows - vc->vc_y;
1534 else if (!nr)
1535 nr = 1;
1536 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1537 vc->vc_need_wrap = 0;
1538 }
1539
1540 /* console_sem is held */
1541 static void csi_P(struct vc_data *vc, unsigned int nr)
1542 {
1543 if (nr > vc->vc_cols - vc->vc_x)
1544 nr = vc->vc_cols - vc->vc_x;
1545 else if (!nr)
1546 nr = 1;
1547 delete_char(vc, nr);
1548 }
1549
1550 /* console_sem is held */
1551 static void csi_M(struct vc_data *vc, unsigned int nr)
1552 {
1553 if (nr > vc->vc_rows - vc->vc_y)
1554 nr = vc->vc_rows - vc->vc_y;
1555 else if (!nr)
1556 nr=1;
1557 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1558 vc->vc_need_wrap = 0;
1559 }
1560
1561 /* console_sem is held (except via vc_init->reset_terminal */
1562 static void save_cur(struct vc_data *vc)
1563 {
1564 vc->vc_saved_x = vc->vc_x;
1565 vc->vc_saved_y = vc->vc_y;
1566 vc->vc_s_intensity = vc->vc_intensity;
1567 vc->vc_s_italic = vc->vc_italic;
1568 vc->vc_s_underline = vc->vc_underline;
1569 vc->vc_s_blink = vc->vc_blink;
1570 vc->vc_s_reverse = vc->vc_reverse;
1571 vc->vc_s_charset = vc->vc_charset;
1572 vc->vc_s_color = vc->vc_color;
1573 vc->vc_saved_G0 = vc->vc_G0_charset;
1574 vc->vc_saved_G1 = vc->vc_G1_charset;
1575 }
1576
1577 /* console_sem is held */
1578 static void restore_cur(struct vc_data *vc)
1579 {
1580 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1581 vc->vc_intensity = vc->vc_s_intensity;
1582 vc->vc_italic = vc->vc_s_italic;
1583 vc->vc_underline = vc->vc_s_underline;
1584 vc->vc_blink = vc->vc_s_blink;
1585 vc->vc_reverse = vc->vc_s_reverse;
1586 vc->vc_charset = vc->vc_s_charset;
1587 vc->vc_color = vc->vc_s_color;
1588 vc->vc_G0_charset = vc->vc_saved_G0;
1589 vc->vc_G1_charset = vc->vc_saved_G1;
1590 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1591 update_attr(vc);
1592 vc->vc_need_wrap = 0;
1593 }
1594
1595 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1596 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1597 ESpalette };
1598
1599 /* console_sem is held (except via vc_init()) */
1600 static void reset_terminal(struct vc_data *vc, int do_clear)
1601 {
1602 vc->vc_top = 0;
1603 vc->vc_bottom = vc->vc_rows;
1604 vc->vc_state = ESnormal;
1605 vc->vc_ques = 0;
1606 vc->vc_translate = set_translate(LAT1_MAP, vc);
1607 vc->vc_G0_charset = LAT1_MAP;
1608 vc->vc_G1_charset = GRAF_MAP;
1609 vc->vc_charset = 0;
1610 vc->vc_need_wrap = 0;
1611 vc->vc_report_mouse = 0;
1612 vc->vc_utf = default_utf8;
1613 vc->vc_utf_count = 0;
1614
1615 vc->vc_disp_ctrl = 0;
1616 vc->vc_toggle_meta = 0;
1617
1618 vc->vc_decscnm = 0;
1619 vc->vc_decom = 0;
1620 vc->vc_decawm = 1;
1621 vc->vc_deccm = 1;
1622 vc->vc_decim = 0;
1623
1624 set_kbd(vc, decarm);
1625 clr_kbd(vc, decckm);
1626 clr_kbd(vc, kbdapplic);
1627 clr_kbd(vc, lnm);
1628 kbd_table[vc->vc_num].lockstate = 0;
1629 kbd_table[vc->vc_num].slockstate = 0;
1630 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1631 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1632 /* do not do set_leds here because this causes an endless tasklet loop
1633 when the keyboard hasn't been initialized yet */
1634
1635 vc->vc_cursor_type = CUR_DEFAULT;
1636 vc->vc_complement_mask = vc->vc_s_complement_mask;
1637
1638 default_attr(vc);
1639 update_attr(vc);
1640
1641 vc->vc_tab_stop[0] = 0x01010100;
1642 vc->vc_tab_stop[1] =
1643 vc->vc_tab_stop[2] =
1644 vc->vc_tab_stop[3] =
1645 vc->vc_tab_stop[4] =
1646 vc->vc_tab_stop[5] =
1647 vc->vc_tab_stop[6] =
1648 vc->vc_tab_stop[7] = 0x01010101;
1649
1650 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1651 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1652
1653 gotoxy(vc, 0, 0);
1654 save_cur(vc);
1655 if (do_clear)
1656 csi_J(vc, 2);
1657 }
1658
1659 /* console_sem is held */
1660 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1661 {
1662 /*
1663 * Control characters can be used in the _middle_
1664 * of an escape sequence.
1665 */
1666 switch (c) {
1667 case 0:
1668 return;
1669 case 7:
1670 if (vc->vc_bell_duration)
1671 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1672 return;
1673 case 8:
1674 bs(vc);
1675 return;
1676 case 9:
1677 vc->vc_pos -= (vc->vc_x << 1);
1678 while (vc->vc_x < vc->vc_cols - 1) {
1679 vc->vc_x++;
1680 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1681 break;
1682 }
1683 vc->vc_pos += (vc->vc_x << 1);
1684 notify_write(vc, '\t');
1685 return;
1686 case 10: case 11: case 12:
1687 lf(vc);
1688 if (!is_kbd(vc, lnm))
1689 return;
1690 case 13:
1691 cr(vc);
1692 return;
1693 case 14:
1694 vc->vc_charset = 1;
1695 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1696 vc->vc_disp_ctrl = 1;
1697 return;
1698 case 15:
1699 vc->vc_charset = 0;
1700 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1701 vc->vc_disp_ctrl = 0;
1702 return;
1703 case 24: case 26:
1704 vc->vc_state = ESnormal;
1705 return;
1706 case 27:
1707 vc->vc_state = ESesc;
1708 return;
1709 case 127:
1710 del(vc);
1711 return;
1712 case 128+27:
1713 vc->vc_state = ESsquare;
1714 return;
1715 }
1716 switch(vc->vc_state) {
1717 case ESesc:
1718 vc->vc_state = ESnormal;
1719 switch (c) {
1720 case '[':
1721 vc->vc_state = ESsquare;
1722 return;
1723 case ']':
1724 vc->vc_state = ESnonstd;
1725 return;
1726 case '%':
1727 vc->vc_state = ESpercent;
1728 return;
1729 case 'E':
1730 cr(vc);
1731 lf(vc);
1732 return;
1733 case 'M':
1734 ri(vc);
1735 return;
1736 case 'D':
1737 lf(vc);
1738 return;
1739 case 'H':
1740 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1741 return;
1742 case 'Z':
1743 respond_ID(tty);
1744 return;
1745 case '7':
1746 save_cur(vc);
1747 return;
1748 case '8':
1749 restore_cur(vc);
1750 return;
1751 case '(':
1752 vc->vc_state = ESsetG0;
1753 return;
1754 case ')':
1755 vc->vc_state = ESsetG1;
1756 return;
1757 case '#':
1758 vc->vc_state = EShash;
1759 return;
1760 case 'c':
1761 reset_terminal(vc, 1);
1762 return;
1763 case '>': /* Numeric keypad */
1764 clr_kbd(vc, kbdapplic);
1765 return;
1766 case '=': /* Appl. keypad */
1767 set_kbd(vc, kbdapplic);
1768 return;
1769 }
1770 return;
1771 case ESnonstd:
1772 if (c=='P') { /* palette escape sequence */
1773 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1774 vc->vc_par[vc->vc_npar] = 0;
1775 vc->vc_npar = 0;
1776 vc->vc_state = ESpalette;
1777 return;
1778 } else if (c=='R') { /* reset palette */
1779 reset_palette(vc);
1780 vc->vc_state = ESnormal;
1781 } else
1782 vc->vc_state = ESnormal;
1783 return;
1784 case ESpalette:
1785 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1786 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1787 if (vc->vc_npar == 7) {
1788 int i = vc->vc_par[0] * 3, j = 1;
1789 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1790 vc->vc_palette[i++] += vc->vc_par[j++];
1791 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1792 vc->vc_palette[i++] += vc->vc_par[j++];
1793 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1794 vc->vc_palette[i] += vc->vc_par[j];
1795 set_palette(vc);
1796 vc->vc_state = ESnormal;
1797 }
1798 } else
1799 vc->vc_state = ESnormal;
1800 return;
1801 case ESsquare:
1802 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1803 vc->vc_par[vc->vc_npar] = 0;
1804 vc->vc_npar = 0;
1805 vc->vc_state = ESgetpars;
1806 if (c == '[') { /* Function key */
1807 vc->vc_state=ESfunckey;
1808 return;
1809 }
1810 vc->vc_ques = (c == '?');
1811 if (vc->vc_ques)
1812 return;
1813 case ESgetpars:
1814 if (c == ';' && vc->vc_npar < NPAR - 1) {
1815 vc->vc_npar++;
1816 return;
1817 } else if (c>='0' && c<='9') {
1818 vc->vc_par[vc->vc_npar] *= 10;
1819 vc->vc_par[vc->vc_npar] += c - '0';
1820 return;
1821 } else
1822 vc->vc_state = ESgotpars;
1823 case ESgotpars:
1824 vc->vc_state = ESnormal;
1825 switch(c) {
1826 case 'h':
1827 set_mode(vc, 1);
1828 return;
1829 case 'l':
1830 set_mode(vc, 0);
1831 return;
1832 case 'c':
1833 if (vc->vc_ques) {
1834 if (vc->vc_par[0])
1835 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1836 else
1837 vc->vc_cursor_type = CUR_DEFAULT;
1838 return;
1839 }
1840 break;
1841 case 'm':
1842 if (vc->vc_ques) {
1843 clear_selection();
1844 if (vc->vc_par[0])
1845 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1846 else
1847 vc->vc_complement_mask = vc->vc_s_complement_mask;
1848 return;
1849 }
1850 break;
1851 case 'n':
1852 if (!vc->vc_ques) {
1853 if (vc->vc_par[0] == 5)
1854 status_report(tty);
1855 else if (vc->vc_par[0] == 6)
1856 cursor_report(vc, tty);
1857 }
1858 return;
1859 }
1860 if (vc->vc_ques) {
1861 vc->vc_ques = 0;
1862 return;
1863 }
1864 switch(c) {
1865 case 'G': case '`':
1866 if (vc->vc_par[0])
1867 vc->vc_par[0]--;
1868 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1869 return;
1870 case 'A':
1871 if (!vc->vc_par[0])
1872 vc->vc_par[0]++;
1873 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1874 return;
1875 case 'B': case 'e':
1876 if (!vc->vc_par[0])
1877 vc->vc_par[0]++;
1878 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1879 return;
1880 case 'C': case 'a':
1881 if (!vc->vc_par[0])
1882 vc->vc_par[0]++;
1883 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1884 return;
1885 case 'D':
1886 if (!vc->vc_par[0])
1887 vc->vc_par[0]++;
1888 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1889 return;
1890 case 'E':
1891 if (!vc->vc_par[0])
1892 vc->vc_par[0]++;
1893 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1894 return;
1895 case 'F':
1896 if (!vc->vc_par[0])
1897 vc->vc_par[0]++;
1898 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1899 return;
1900 case 'd':
1901 if (vc->vc_par[0])
1902 vc->vc_par[0]--;
1903 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1904 return;
1905 case 'H': case 'f':
1906 if (vc->vc_par[0])
1907 vc->vc_par[0]--;
1908 if (vc->vc_par[1])
1909 vc->vc_par[1]--;
1910 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1911 return;
1912 case 'J':
1913 csi_J(vc, vc->vc_par[0]);
1914 return;
1915 case 'K':
1916 csi_K(vc, vc->vc_par[0]);
1917 return;
1918 case 'L':
1919 csi_L(vc, vc->vc_par[0]);
1920 return;
1921 case 'M':
1922 csi_M(vc, vc->vc_par[0]);
1923 return;
1924 case 'P':
1925 csi_P(vc, vc->vc_par[0]);
1926 return;
1927 case 'c':
1928 if (!vc->vc_par[0])
1929 respond_ID(tty);
1930 return;
1931 case 'g':
1932 if (!vc->vc_par[0])
1933 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1934 else if (vc->vc_par[0] == 3) {
1935 vc->vc_tab_stop[0] =
1936 vc->vc_tab_stop[1] =
1937 vc->vc_tab_stop[2] =
1938 vc->vc_tab_stop[3] =
1939 vc->vc_tab_stop[4] =
1940 vc->vc_tab_stop[5] =
1941 vc->vc_tab_stop[6] =
1942 vc->vc_tab_stop[7] = 0;
1943 }
1944 return;
1945 case 'm':
1946 csi_m(vc);
1947 return;
1948 case 'q': /* DECLL - but only 3 leds */
1949 /* map 0,1,2,3 to 0,1,2,4 */
1950 if (vc->vc_par[0] < 4)
1951 setledstate(kbd_table + vc->vc_num,
1952 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1953 return;
1954 case 'r':
1955 if (!vc->vc_par[0])
1956 vc->vc_par[0]++;
1957 if (!vc->vc_par[1])
1958 vc->vc_par[1] = vc->vc_rows;
1959 /* Minimum allowed region is 2 lines */
1960 if (vc->vc_par[0] < vc->vc_par[1] &&
1961 vc->vc_par[1] <= vc->vc_rows) {
1962 vc->vc_top = vc->vc_par[0] - 1;
1963 vc->vc_bottom = vc->vc_par[1];
1964 gotoxay(vc, 0, 0);
1965 }
1966 return;
1967 case 's':
1968 save_cur(vc);
1969 return;
1970 case 'u':
1971 restore_cur(vc);
1972 return;
1973 case 'X':
1974 csi_X(vc, vc->vc_par[0]);
1975 return;
1976 case '@':
1977 csi_at(vc, vc->vc_par[0]);
1978 return;
1979 case ']': /* setterm functions */
1980 setterm_command(vc);
1981 return;
1982 }
1983 return;
1984 case ESpercent:
1985 vc->vc_state = ESnormal;
1986 switch (c) {
1987 case '@': /* defined in ISO 2022 */
1988 vc->vc_utf = 0;
1989 return;
1990 case 'G': /* prelim official escape code */
1991 case '8': /* retained for compatibility */
1992 vc->vc_utf = 1;
1993 return;
1994 }
1995 return;
1996 case ESfunckey:
1997 vc->vc_state = ESnormal;
1998 return;
1999 case EShash:
2000 vc->vc_state = ESnormal;
2001 if (c == '8') {
2002 /* DEC screen alignment test. kludge :-) */
2003 vc->vc_video_erase_char =
2004 (vc->vc_video_erase_char & 0xff00) | 'E';
2005 csi_J(vc, 2);
2006 vc->vc_video_erase_char =
2007 (vc->vc_video_erase_char & 0xff00) | ' ';
2008 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2009 }
2010 return;
2011 case ESsetG0:
2012 if (c == '0')
2013 vc->vc_G0_charset = GRAF_MAP;
2014 else if (c == 'B')
2015 vc->vc_G0_charset = LAT1_MAP;
2016 else if (c == 'U')
2017 vc->vc_G0_charset = IBMPC_MAP;
2018 else if (c == 'K')
2019 vc->vc_G0_charset = USER_MAP;
2020 if (vc->vc_charset == 0)
2021 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2022 vc->vc_state = ESnormal;
2023 return;
2024 case ESsetG1:
2025 if (c == '0')
2026 vc->vc_G1_charset = GRAF_MAP;
2027 else if (c == 'B')
2028 vc->vc_G1_charset = LAT1_MAP;
2029 else if (c == 'U')
2030 vc->vc_G1_charset = IBMPC_MAP;
2031 else if (c == 'K')
2032 vc->vc_G1_charset = USER_MAP;
2033 if (vc->vc_charset == 1)
2034 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2035 vc->vc_state = ESnormal;
2036 return;
2037 default:
2038 vc->vc_state = ESnormal;
2039 }
2040 }
2041
2042 /* This is a temporary buffer used to prepare a tty console write
2043 * so that we can easily avoid touching user space while holding the
2044 * console spinlock. It is allocated in con_init and is shared by
2045 * this code and the vc_screen read/write tty calls.
2046 *
2047 * We have to allocate this statically in the kernel data section
2048 * since console_init (and thus con_init) are called before any
2049 * kernel memory allocation is available.
2050 */
2051 char con_buf[CON_BUF_SIZE];
2052 DEFINE_MUTEX(con_buf_mtx);
2053
2054 /* is_double_width() is based on the wcwidth() implementation by
2055 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2056 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2057 */
2058 struct interval {
2059 uint32_t first;
2060 uint32_t last;
2061 };
2062
2063 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2064 {
2065 int min = 0;
2066 int mid;
2067
2068 if (ucs < table[0].first || ucs > table[max].last)
2069 return 0;
2070 while (max >= min) {
2071 mid = (min + max) / 2;
2072 if (ucs > table[mid].last)
2073 min = mid + 1;
2074 else if (ucs < table[mid].first)
2075 max = mid - 1;
2076 else
2077 return 1;
2078 }
2079 return 0;
2080 }
2081
2082 static int is_double_width(uint32_t ucs)
2083 {
2084 static const struct interval double_width[] = {
2085 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2086 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2087 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2088 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2089 };
2090 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2091 }
2092
2093 /* acquires console_sem */
2094 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2095 {
2096 #ifdef VT_BUF_VRAM_ONLY
2097 #define FLUSH do { } while(0);
2098 #else
2099 #define FLUSH if (draw_x >= 0) { \
2100 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2101 draw_x = -1; \
2102 }
2103 #endif
2104
2105 int c, tc, ok, n = 0, draw_x = -1;
2106 unsigned int currcons;
2107 unsigned long draw_from = 0, draw_to = 0;
2108 struct vc_data *vc;
2109 unsigned char vc_attr;
2110 struct vt_notifier_param param;
2111 uint8_t rescan;
2112 uint8_t inverse;
2113 uint8_t width;
2114 u16 himask, charmask;
2115 const unsigned char *orig_buf = NULL;
2116 int orig_count;
2117
2118 if (in_interrupt())
2119 return count;
2120
2121 might_sleep();
2122
2123 acquire_console_sem();
2124 vc = tty->driver_data;
2125 if (vc == NULL) {
2126 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2127 release_console_sem();
2128 return 0;
2129 }
2130
2131 currcons = vc->vc_num;
2132 if (!vc_cons_allocated(currcons)) {
2133 /* could this happen? */
2134 static int error = 0;
2135 if (!error) {
2136 error = 1;
2137 printk("con_write: tty %d not allocated\n", currcons+1);
2138 }
2139 release_console_sem();
2140 return 0;
2141 }
2142 orig_buf = buf;
2143 orig_count = count;
2144
2145 himask = vc->vc_hi_font_mask;
2146 charmask = himask ? 0x1ff : 0xff;
2147
2148 /* undraw cursor first */
2149 if (IS_FG(vc))
2150 hide_cursor(vc);
2151
2152 param.vc = vc;
2153
2154 while (!tty->stopped && count) {
2155 int orig = *buf;
2156 c = orig;
2157 buf++;
2158 n++;
2159 count--;
2160 rescan = 0;
2161 inverse = 0;
2162 width = 1;
2163
2164 /* Do no translation at all in control states */
2165 if (vc->vc_state != ESnormal) {
2166 tc = c;
2167 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2168 /* Combine UTF-8 into Unicode in vc_utf_char.
2169 * vc_utf_count is the number of continuation bytes still
2170 * expected to arrive.
2171 * vc_npar is the number of continuation bytes arrived so
2172 * far
2173 */
2174 rescan_last_byte:
2175 if ((c & 0xc0) == 0x80) {
2176 /* Continuation byte received */
2177 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2178 if (vc->vc_utf_count) {
2179 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2180 vc->vc_npar++;
2181 if (--vc->vc_utf_count) {
2182 /* Still need some bytes */
2183 continue;
2184 }
2185 /* Got a whole character */
2186 c = vc->vc_utf_char;
2187 /* Reject overlong sequences */
2188 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2189 c > utf8_length_changes[vc->vc_npar])
2190 c = 0xfffd;
2191 } else {
2192 /* Unexpected continuation byte */
2193 vc->vc_utf_count = 0;
2194 c = 0xfffd;
2195 }
2196 } else {
2197 /* Single ASCII byte or first byte of a sequence received */
2198 if (vc->vc_utf_count) {
2199 /* Continuation byte expected */
2200 rescan = 1;
2201 vc->vc_utf_count = 0;
2202 c = 0xfffd;
2203 } else if (c > 0x7f) {
2204 /* First byte of a multibyte sequence received */
2205 vc->vc_npar = 0;
2206 if ((c & 0xe0) == 0xc0) {
2207 vc->vc_utf_count = 1;
2208 vc->vc_utf_char = (c & 0x1f);
2209 } else if ((c & 0xf0) == 0xe0) {
2210 vc->vc_utf_count = 2;
2211 vc->vc_utf_char = (c & 0x0f);
2212 } else if ((c & 0xf8) == 0xf0) {
2213 vc->vc_utf_count = 3;
2214 vc->vc_utf_char = (c & 0x07);
2215 } else if ((c & 0xfc) == 0xf8) {
2216 vc->vc_utf_count = 4;
2217 vc->vc_utf_char = (c & 0x03);
2218 } else if ((c & 0xfe) == 0xfc) {
2219 vc->vc_utf_count = 5;
2220 vc->vc_utf_char = (c & 0x01);
2221 } else {
2222 /* 254 and 255 are invalid */
2223 c = 0xfffd;
2224 }
2225 if (vc->vc_utf_count) {
2226 /* Still need some bytes */
2227 continue;
2228 }
2229 }
2230 /* Nothing to do if an ASCII byte was received */
2231 }
2232 /* End of UTF-8 decoding. */
2233 /* c is the received character, or U+FFFD for invalid sequences. */
2234 /* Replace invalid Unicode code points with U+FFFD too */
2235 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2236 c = 0xfffd;
2237 tc = c;
2238 } else { /* no utf or alternate charset mode */
2239 tc = vc_translate(vc, c);
2240 }
2241
2242 param.c = tc;
2243 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2244 &param) == NOTIFY_STOP)
2245 continue;
2246
2247 /* If the original code was a control character we
2248 * only allow a glyph to be displayed if the code is
2249 * not normally used (such as for cursor movement) or
2250 * if the disp_ctrl mode has been explicitly enabled.
2251 * Certain characters (as given by the CTRL_ALWAYS
2252 * bitmap) are always displayed as control characters,
2253 * as the console would be pretty useless without
2254 * them; to display an arbitrary font position use the
2255 * direct-to-font zone in UTF-8 mode.
2256 */
2257 ok = tc && (c >= 32 ||
2258 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2259 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2260 && (c != 127 || vc->vc_disp_ctrl)
2261 && (c != 128+27);
2262
2263 if (vc->vc_state == ESnormal && ok) {
2264 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2265 if (is_double_width(c))
2266 width = 2;
2267 }
2268 /* Now try to find out how to display it */
2269 tc = conv_uni_to_pc(vc, tc);
2270 if (tc & ~charmask) {
2271 if (tc == -1 || tc == -2) {
2272 continue; /* nothing to display */
2273 }
2274 /* Glyph not found */
2275 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) && c < 128) && !(c & ~charmask)) {
2276 /* In legacy mode use the glyph we get by a 1:1 mapping.
2277 This would make absolutely no sense with Unicode in mind,
2278 but do this for ASCII characters since a font may lack
2279 Unicode mapping info and we don't want to end up with
2280 having question marks only. */
2281 tc = c;
2282 } else {
2283 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2284 tc = conv_uni_to_pc(vc, 0xfffd);
2285 if (tc < 0) {
2286 inverse = 1;
2287 tc = conv_uni_to_pc(vc, '?');
2288 if (tc < 0) tc = '?';
2289 }
2290 }
2291 }
2292
2293 if (!inverse) {
2294 vc_attr = vc->vc_attr;
2295 } else {
2296 /* invert vc_attr */
2297 if (!vc->vc_can_do_color) {
2298 vc_attr = (vc->vc_attr) ^ 0x08;
2299 } else if (vc->vc_hi_font_mask == 0x100) {
2300 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2301 } else {
2302 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2303 }
2304 FLUSH
2305 }
2306
2307 while (1) {
2308 if (vc->vc_need_wrap || vc->vc_decim)
2309 FLUSH
2310 if (vc->vc_need_wrap) {
2311 cr(vc);
2312 lf(vc);
2313 }
2314 if (vc->vc_decim)
2315 insert_char(vc, 1);
2316 scr_writew(himask ?
2317 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2318 (vc_attr << 8) + tc,
2319 (u16 *) vc->vc_pos);
2320 if (DO_UPDATE(vc) && draw_x < 0) {
2321 draw_x = vc->vc_x;
2322 draw_from = vc->vc_pos;
2323 }
2324 if (vc->vc_x == vc->vc_cols - 1) {
2325 vc->vc_need_wrap = vc->vc_decawm;
2326 draw_to = vc->vc_pos + 2;
2327 } else {
2328 vc->vc_x++;
2329 draw_to = (vc->vc_pos += 2);
2330 }
2331
2332 if (!--width) break;
2333
2334 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2335 if (tc < 0) tc = ' ';
2336 }
2337 notify_write(vc, c);
2338
2339 if (inverse) {
2340 FLUSH
2341 }
2342
2343 if (rescan) {
2344 rescan = 0;
2345 inverse = 0;
2346 width = 1;
2347 c = orig;
2348 goto rescan_last_byte;
2349 }
2350 continue;
2351 }
2352 FLUSH
2353 do_con_trol(tty, vc, orig);
2354 }
2355 FLUSH
2356 console_conditional_schedule();
2357 release_console_sem();
2358 notify_update(vc);
2359 return n;
2360 #undef FLUSH
2361 }
2362
2363 /*
2364 * This is the console switching callback.
2365 *
2366 * Doing console switching in a process context allows
2367 * us to do the switches asynchronously (needed when we want
2368 * to switch due to a keyboard interrupt). Synchronization
2369 * with other console code and prevention of re-entrancy is
2370 * ensured with console_sem.
2371 */
2372 static void console_callback(struct work_struct *ignored)
2373 {
2374 acquire_console_sem();
2375
2376 if (want_console >= 0) {
2377 if (want_console != fg_console &&
2378 vc_cons_allocated(want_console)) {
2379 hide_cursor(vc_cons[fg_console].d);
2380 change_console(vc_cons[want_console].d);
2381 /* we only changed when the console had already
2382 been allocated - a new console is not created
2383 in an interrupt routine */
2384 }
2385 want_console = -1;
2386 }
2387 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2388 do_poke_blanked_console = 0;
2389 poke_blanked_console();
2390 }
2391 if (scrollback_delta) {
2392 struct vc_data *vc = vc_cons[fg_console].d;
2393 clear_selection();
2394 if (vc->vc_mode == KD_TEXT)
2395 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2396 scrollback_delta = 0;
2397 }
2398 if (blank_timer_expired) {
2399 do_blank_screen(0);
2400 blank_timer_expired = 0;
2401 }
2402 notify_update(vc_cons[fg_console].d);
2403
2404 release_console_sem();
2405 }
2406
2407 int set_console(int nr)
2408 {
2409 struct vc_data *vc = vc_cons[fg_console].d;
2410
2411 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2412 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2413
2414 /*
2415 * Console switch will fail in console_callback() or
2416 * change_console() so there is no point scheduling
2417 * the callback
2418 *
2419 * Existing set_console() users don't check the return
2420 * value so this shouldn't break anything
2421 */
2422 return -EINVAL;
2423 }
2424
2425 want_console = nr;
2426 schedule_console_callback();
2427
2428 return 0;
2429 }
2430
2431 struct tty_driver *console_driver;
2432
2433 #ifdef CONFIG_VT_CONSOLE
2434
2435 /*
2436 * Console on virtual terminal
2437 *
2438 * The console must be locked when we get here.
2439 */
2440
2441 static void vt_console_print(struct console *co, const char *b, unsigned count)
2442 {
2443 struct vc_data *vc = vc_cons[fg_console].d;
2444 unsigned char c;
2445 static DEFINE_SPINLOCK(printing_lock);
2446 const ushort *start;
2447 ushort cnt = 0;
2448 ushort myx;
2449
2450 /* console busy or not yet initialized */
2451 if (!printable)
2452 return;
2453 if (!spin_trylock(&printing_lock))
2454 return;
2455
2456 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2457 vc = vc_cons[kmsg_redirect - 1].d;
2458
2459 /* read `x' only after setting currcons properly (otherwise
2460 the `x' macro will read the x of the foreground console). */
2461 myx = vc->vc_x;
2462
2463 if (!vc_cons_allocated(fg_console)) {
2464 /* impossible */
2465 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2466 goto quit;
2467 }
2468
2469 if (vc->vc_mode != KD_TEXT)
2470 goto quit;
2471
2472 /* undraw cursor first */
2473 if (IS_FG(vc))
2474 hide_cursor(vc);
2475
2476 start = (ushort *)vc->vc_pos;
2477
2478 /* Contrived structure to try to emulate original need_wrap behaviour
2479 * Problems caused when we have need_wrap set on '\n' character */
2480 while (count--) {
2481 c = *b++;
2482 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2483 if (cnt > 0) {
2484 if (CON_IS_VISIBLE(vc))
2485 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2486 vc->vc_x += cnt;
2487 if (vc->vc_need_wrap)
2488 vc->vc_x--;
2489 cnt = 0;
2490 }
2491 if (c == 8) { /* backspace */
2492 bs(vc);
2493 start = (ushort *)vc->vc_pos;
2494 myx = vc->vc_x;
2495 continue;
2496 }
2497 if (c != 13)
2498 lf(vc);
2499 cr(vc);
2500 start = (ushort *)vc->vc_pos;
2501 myx = vc->vc_x;
2502 if (c == 10 || c == 13)
2503 continue;
2504 }
2505 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2506 notify_write(vc, c);
2507 cnt++;
2508 if (myx == vc->vc_cols - 1) {
2509 vc->vc_need_wrap = 1;
2510 continue;
2511 }
2512 vc->vc_pos += 2;
2513 myx++;
2514 }
2515 if (cnt > 0) {
2516 if (CON_IS_VISIBLE(vc))
2517 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2518 vc->vc_x += cnt;
2519 if (vc->vc_x == vc->vc_cols) {
2520 vc->vc_x--;
2521 vc->vc_need_wrap = 1;
2522 }
2523 }
2524 set_cursor(vc);
2525 notify_update(vc);
2526
2527 quit:
2528 spin_unlock(&printing_lock);
2529 }
2530
2531 static struct tty_driver *vt_console_device(struct console *c, int *index)
2532 {
2533 *index = c->index ? c->index-1 : fg_console;
2534 return console_driver;
2535 }
2536
2537 static struct console vt_console_driver = {
2538 .name = "tty",
2539 .write = vt_console_print,
2540 .device = vt_console_device,
2541 .unblank = unblank_screen,
2542 .flags = CON_PRINTBUFFER,
2543 .index = -1,
2544 };
2545 #endif
2546
2547 /*
2548 * Handling of Linux-specific VC ioctls
2549 */
2550
2551 /*
2552 * Generally a bit racy with respect to console_sem().
2553 *
2554 * There are some functions which don't need it.
2555 *
2556 * There are some functions which can sleep for arbitrary periods
2557 * (paste_selection) but we don't need the lock there anyway.
2558 *
2559 * set_selection has locking, and definitely needs it
2560 */
2561
2562 int tioclinux(struct tty_struct *tty, unsigned long arg)
2563 {
2564 char type, data;
2565 char __user *p = (char __user *)arg;
2566 int lines;
2567 int ret;
2568
2569 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2570 return -EPERM;
2571 if (get_user(type, p))
2572 return -EFAULT;
2573 ret = 0;
2574
2575 lock_kernel();
2576
2577 switch (type)
2578 {
2579 case TIOCL_SETSEL:
2580 acquire_console_sem();
2581 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2582 release_console_sem();
2583 break;
2584 case TIOCL_PASTESEL:
2585 ret = paste_selection(tty);
2586 break;
2587 case TIOCL_UNBLANKSCREEN:
2588 acquire_console_sem();
2589 unblank_screen();
2590 release_console_sem();
2591 break;
2592 case TIOCL_SELLOADLUT:
2593 ret = sel_loadlut(p);
2594 break;
2595 case TIOCL_GETSHIFTSTATE:
2596
2597 /*
2598 * Make it possible to react to Shift+Mousebutton.
2599 * Note that 'shift_state' is an undocumented
2600 * kernel-internal variable; programs not closely
2601 * related to the kernel should not use this.
2602 */
2603 data = shift_state;
2604 ret = __put_user(data, p);
2605 break;
2606 case TIOCL_GETMOUSEREPORTING:
2607 data = mouse_reporting();
2608 ret = __put_user(data, p);
2609 break;
2610 case TIOCL_SETVESABLANK:
2611 ret = set_vesa_blanking(p);
2612 break;
2613 case TIOCL_GETKMSGREDIRECT:
2614 data = kmsg_redirect;
2615 ret = __put_user(data, p);
2616 break;
2617 case TIOCL_SETKMSGREDIRECT:
2618 if (!capable(CAP_SYS_ADMIN)) {
2619 ret = -EPERM;
2620 } else {
2621 if (get_user(data, p+1))
2622 ret = -EFAULT;
2623 else
2624 kmsg_redirect = data;
2625 }
2626 break;
2627 case TIOCL_GETFGCONSOLE:
2628 ret = fg_console;
2629 break;
2630 case TIOCL_SCROLLCONSOLE:
2631 if (get_user(lines, (s32 __user *)(p+4))) {
2632 ret = -EFAULT;
2633 } else {
2634 scrollfront(vc_cons[fg_console].d, lines);
2635 ret = 0;
2636 }
2637 break;
2638 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2639 acquire_console_sem();
2640 ignore_poke = 1;
2641 do_blank_screen(0);
2642 release_console_sem();
2643 break;
2644 case TIOCL_BLANKEDSCREEN:
2645 ret = console_blanked;
2646 break;
2647 default:
2648 ret = -EINVAL;
2649 break;
2650 }
2651 unlock_kernel();
2652 return ret;
2653 }
2654
2655 /*
2656 * /dev/ttyN handling
2657 */
2658
2659 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2660 {
2661 int retval;
2662
2663 retval = do_con_write(tty, buf, count);
2664 con_flush_chars(tty);
2665
2666 return retval;
2667 }
2668
2669 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2670 {
2671 if (in_interrupt())
2672 return 0; /* n_r3964 calls put_char() from interrupt context */
2673 return do_con_write(tty, &ch, 1);
2674 }
2675
2676 static int con_write_room(struct tty_struct *tty)
2677 {
2678 if (tty->stopped)
2679 return 0;
2680 return 32768; /* No limit, really; we're not buffering */
2681 }
2682
2683 static int con_chars_in_buffer(struct tty_struct *tty)
2684 {
2685 return 0; /* we're not buffering */
2686 }
2687
2688 /*
2689 * con_throttle and con_unthrottle are only used for
2690 * paste_selection(), which has to stuff in a large number of
2691 * characters...
2692 */
2693 static void con_throttle(struct tty_struct *tty)
2694 {
2695 }
2696
2697 static void con_unthrottle(struct tty_struct *tty)
2698 {
2699 struct vc_data *vc = tty->driver_data;
2700
2701 wake_up_interruptible(&vc->paste_wait);
2702 }
2703
2704 /*
2705 * Turn the Scroll-Lock LED on when the tty is stopped
2706 */
2707 static void con_stop(struct tty_struct *tty)
2708 {
2709 int console_num;
2710 if (!tty)
2711 return;
2712 console_num = tty->index;
2713 if (!vc_cons_allocated(console_num))
2714 return;
2715 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2716 set_leds();
2717 }
2718
2719 /*
2720 * Turn the Scroll-Lock LED off when the console is started
2721 */
2722 static void con_start(struct tty_struct *tty)
2723 {
2724 int console_num;
2725 if (!tty)
2726 return;
2727 console_num = tty->index;
2728 if (!vc_cons_allocated(console_num))
2729 return;
2730 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2731 set_leds();
2732 }
2733
2734 static void con_flush_chars(struct tty_struct *tty)
2735 {
2736 struct vc_data *vc;
2737
2738 if (in_interrupt()) /* from flush_to_ldisc */
2739 return;
2740
2741 /* if we race with con_close(), vt may be null */
2742 acquire_console_sem();
2743 vc = tty->driver_data;
2744 if (vc)
2745 set_cursor(vc);
2746 release_console_sem();
2747 }
2748
2749 /*
2750 * Allocate the console screen memory.
2751 */
2752 static int con_open(struct tty_struct *tty, struct file *filp)
2753 {
2754 unsigned int currcons = tty->index;
2755 int ret = 0;
2756
2757 acquire_console_sem();
2758 if (tty->driver_data == NULL) {
2759 ret = vc_allocate(currcons);
2760 if (ret == 0) {
2761 struct vc_data *vc = vc_cons[currcons].d;
2762
2763 /* Still being freed */
2764 if (vc->vc_tty) {
2765 release_console_sem();
2766 return -ERESTARTSYS;
2767 }
2768 tty->driver_data = vc;
2769 vc->vc_tty = tty;
2770
2771 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2772 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2773 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2774 }
2775 if (vc->vc_utf)
2776 tty->termios->c_iflag |= IUTF8;
2777 else
2778 tty->termios->c_iflag &= ~IUTF8;
2779 vcs_make_sysfs(tty);
2780 release_console_sem();
2781 return ret;
2782 }
2783 }
2784 release_console_sem();
2785 return ret;
2786 }
2787
2788 static void con_close(struct tty_struct *tty, struct file *filp)
2789 {
2790 /* Nothing to do - we defer to shutdown */
2791 }
2792
2793 static void con_shutdown(struct tty_struct *tty)
2794 {
2795 struct vc_data *vc = tty->driver_data;
2796 BUG_ON(vc == NULL);
2797 acquire_console_sem();
2798 vc->vc_tty = NULL;
2799 vcs_remove_sysfs(tty);
2800 release_console_sem();
2801 tty_shutdown(tty);
2802 }
2803
2804 static int default_italic_color = 2; // green (ASCII)
2805 static int default_underline_color = 3; // cyan (ASCII)
2806 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2807 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2808
2809 static void vc_init(struct vc_data *vc, unsigned int rows,
2810 unsigned int cols, int do_clear)
2811 {
2812 int j, k ;
2813
2814 vc->vc_cols = cols;
2815 vc->vc_rows = rows;
2816 vc->vc_size_row = cols << 1;
2817 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2818
2819 set_origin(vc);
2820 vc->vc_pos = vc->vc_origin;
2821 reset_vc(vc);
2822 for (j=k=0; j<16; j++) {
2823 vc->vc_palette[k++] = default_red[j] ;
2824 vc->vc_palette[k++] = default_grn[j] ;
2825 vc->vc_palette[k++] = default_blu[j] ;
2826 }
2827 vc->vc_def_color = 0x07; /* white */
2828 vc->vc_ulcolor = default_underline_color;
2829 vc->vc_itcolor = default_italic_color;
2830 vc->vc_halfcolor = 0x08; /* grey */
2831 init_waitqueue_head(&vc->paste_wait);
2832 reset_terminal(vc, do_clear);
2833 }
2834
2835 /*
2836 * This routine initializes console interrupts, and does nothing
2837 * else. If you want the screen to clear, call tty_write with
2838 * the appropriate escape-sequence.
2839 */
2840
2841 static int __init con_init(void)
2842 {
2843 const char *display_desc = NULL;
2844 struct vc_data *vc;
2845 unsigned int currcons = 0, i;
2846
2847 acquire_console_sem();
2848
2849 if (conswitchp)
2850 display_desc = conswitchp->con_startup();
2851 if (!display_desc) {
2852 fg_console = 0;
2853 release_console_sem();
2854 return 0;
2855 }
2856
2857 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2858 struct con_driver *con_driver = &registered_con_driver[i];
2859
2860 if (con_driver->con == NULL) {
2861 con_driver->con = conswitchp;
2862 con_driver->desc = display_desc;
2863 con_driver->flag = CON_DRIVER_FLAG_INIT;
2864 con_driver->first = 0;
2865 con_driver->last = MAX_NR_CONSOLES - 1;
2866 break;
2867 }
2868 }
2869
2870 for (i = 0; i < MAX_NR_CONSOLES; i++)
2871 con_driver_map[i] = conswitchp;
2872
2873 if (blankinterval) {
2874 blank_state = blank_normal_wait;
2875 mod_timer(&console_timer, jiffies + blankinterval);
2876 }
2877
2878 /*
2879 * kmalloc is not running yet - we use the bootmem allocator.
2880 */
2881 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2882 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2883 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2884 visual_init(vc, currcons, 1);
2885 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2886 vc->vc_kmalloced = 0;
2887 vc_init(vc, vc->vc_rows, vc->vc_cols,
2888 currcons || !vc->vc_sw->con_save_screen);
2889 }
2890 currcons = fg_console = 0;
2891 master_display_fg = vc = vc_cons[currcons].d;
2892 set_origin(vc);
2893 save_screen(vc);
2894 gotoxy(vc, vc->vc_x, vc->vc_y);
2895 csi_J(vc, 0);
2896 update_screen(vc);
2897 printk("Console: %s %s %dx%d",
2898 vc->vc_can_do_color ? "colour" : "mono",
2899 display_desc, vc->vc_cols, vc->vc_rows);
2900 printable = 1;
2901 printk("\n");
2902
2903 release_console_sem();
2904
2905 #ifdef CONFIG_VT_CONSOLE
2906 register_console(&vt_console_driver);
2907 #endif
2908 return 0;
2909 }
2910 console_initcall(con_init);
2911
2912 static const struct tty_operations con_ops = {
2913 .open = con_open,
2914 .close = con_close,
2915 .write = con_write,
2916 .write_room = con_write_room,
2917 .put_char = con_put_char,
2918 .flush_chars = con_flush_chars,
2919 .chars_in_buffer = con_chars_in_buffer,
2920 .ioctl = vt_ioctl,
2921 .stop = con_stop,
2922 .start = con_start,
2923 .throttle = con_throttle,
2924 .unthrottle = con_unthrottle,
2925 .resize = vt_resize,
2926 .shutdown = con_shutdown
2927 };
2928
2929 static struct cdev vc0_cdev;
2930
2931 int __init vty_init(const struct file_operations *console_fops)
2932 {
2933 cdev_init(&vc0_cdev, console_fops);
2934 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2935 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2936 panic("Couldn't register /dev/tty0 driver\n");
2937 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2938
2939 vcs_init();
2940
2941 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2942 if (!console_driver)
2943 panic("Couldn't allocate console driver\n");
2944 console_driver->owner = THIS_MODULE;
2945 console_driver->name = "tty";
2946 console_driver->name_base = 1;
2947 console_driver->major = TTY_MAJOR;
2948 console_driver->minor_start = 1;
2949 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2950 console_driver->init_termios = tty_std_termios;
2951 if (default_utf8)
2952 console_driver->init_termios.c_iflag |= IUTF8;
2953 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2954 tty_set_operations(console_driver, &con_ops);
2955 if (tty_register_driver(console_driver))
2956 panic("Couldn't register console driver\n");
2957 kbd_init();
2958 console_map_init();
2959 #ifdef CONFIG_PROM_CONSOLE
2960 prom_con_init();
2961 #endif
2962 #ifdef CONFIG_MDA_CONSOLE
2963 mda_console_init();
2964 #endif
2965 return 0;
2966 }
2967
2968 #ifndef VT_SINGLE_DRIVER
2969 #include <linux/device.h>
2970
2971 static struct class *vtconsole_class;
2972
2973 static int bind_con_driver(const struct consw *csw, int first, int last,
2974 int deflt)
2975 {
2976 struct module *owner = csw->owner;
2977 const char *desc = NULL;
2978 struct con_driver *con_driver;
2979 int i, j = -1, k = -1, retval = -ENODEV;
2980
2981 if (!try_module_get(owner))
2982 return -ENODEV;
2983
2984 acquire_console_sem();
2985
2986 /* check if driver is registered */
2987 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2988 con_driver = &registered_con_driver[i];
2989
2990 if (con_driver->con == csw) {
2991 desc = con_driver->desc;
2992 retval = 0;
2993 break;
2994 }
2995 }
2996
2997 if (retval)
2998 goto err;
2999
3000 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3001 csw->con_startup();
3002 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3003 }
3004
3005 if (deflt) {
3006 if (conswitchp)
3007 module_put(conswitchp->owner);
3008
3009 __module_get(owner);
3010 conswitchp = csw;
3011 }
3012
3013 first = max(first, con_driver->first);
3014 last = min(last, con_driver->last);
3015
3016 for (i = first; i <= last; i++) {
3017 int old_was_color;
3018 struct vc_data *vc = vc_cons[i].d;
3019
3020 if (con_driver_map[i])
3021 module_put(con_driver_map[i]->owner);
3022 __module_get(owner);
3023 con_driver_map[i] = csw;
3024
3025 if (!vc || !vc->vc_sw)
3026 continue;
3027
3028 j = i;
3029
3030 if (CON_IS_VISIBLE(vc)) {
3031 k = i;
3032 save_screen(vc);
3033 }
3034
3035 old_was_color = vc->vc_can_do_color;
3036 vc->vc_sw->con_deinit(vc);
3037 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3038 visual_init(vc, i, 0);
3039 set_origin(vc);
3040 update_attr(vc);
3041
3042 /* If the console changed between mono <-> color, then
3043 * the attributes in the screenbuf will be wrong. The
3044 * following resets all attributes to something sane.
3045 */
3046 if (old_was_color != vc->vc_can_do_color)
3047 clear_buffer_attributes(vc);
3048 }
3049
3050 printk("Console: switching ");
3051 if (!deflt)
3052 printk("consoles %d-%d ", first+1, last+1);
3053 if (j >= 0) {
3054 struct vc_data *vc = vc_cons[j].d;
3055
3056 printk("to %s %s %dx%d\n",
3057 vc->vc_can_do_color ? "colour" : "mono",
3058 desc, vc->vc_cols, vc->vc_rows);
3059
3060 if (k >= 0) {
3061 vc = vc_cons[k].d;
3062 update_screen(vc);
3063 }
3064 } else
3065 printk("to %s\n", desc);
3066
3067 retval = 0;
3068 err:
3069 release_console_sem();
3070 module_put(owner);
3071 return retval;
3072 };
3073
3074 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3075 static int con_is_graphics(const struct consw *csw, int first, int last)
3076 {
3077 int i, retval = 0;
3078
3079 for (i = first; i <= last; i++) {
3080 struct vc_data *vc = vc_cons[i].d;
3081
3082 if (vc && vc->vc_mode == KD_GRAPHICS) {
3083 retval = 1;
3084 break;
3085 }
3086 }
3087
3088 return retval;
3089 }
3090
3091 /**
3092 * unbind_con_driver - unbind a console driver
3093 * @csw: pointer to console driver to unregister
3094 * @first: first in range of consoles that @csw should be unbound from
3095 * @last: last in range of consoles that @csw should be unbound from
3096 * @deflt: should next bound console driver be default after @csw is unbound?
3097 *
3098 * To unbind a driver from all possible consoles, pass 0 as @first and
3099 * %MAX_NR_CONSOLES as @last.
3100 *
3101 * @deflt controls whether the console that ends up replacing @csw should be
3102 * the default console.
3103 *
3104 * RETURNS:
3105 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3106 * or 0 on success.
3107 */
3108 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3109 {
3110 struct module *owner = csw->owner;
3111 const struct consw *defcsw = NULL;
3112 struct con_driver *con_driver = NULL, *con_back = NULL;
3113 int i, retval = -ENODEV;
3114
3115 if (!try_module_get(owner))
3116 return -ENODEV;
3117
3118 acquire_console_sem();
3119
3120 /* check if driver is registered and if it is unbindable */
3121 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3122 con_driver = &registered_con_driver[i];
3123
3124 if (con_driver->con == csw &&
3125 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3126 retval = 0;
3127 break;
3128 }
3129 }
3130
3131 if (retval) {
3132 release_console_sem();
3133 goto err;
3134 }
3135
3136 retval = -ENODEV;
3137
3138 /* check if backup driver exists */
3139 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3140 con_back = &registered_con_driver[i];
3141
3142 if (con_back->con &&
3143 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3144 defcsw = con_back->con;
3145 retval = 0;
3146 break;
3147 }
3148 }
3149
3150 if (retval) {
3151 release_console_sem();
3152 goto err;
3153 }
3154
3155 if (!con_is_bound(csw)) {
3156 release_console_sem();
3157 goto err;
3158 }
3159
3160 first = max(first, con_driver->first);
3161 last = min(last, con_driver->last);
3162
3163 for (i = first; i <= last; i++) {
3164 if (con_driver_map[i] == csw) {
3165 module_put(csw->owner);
3166 con_driver_map[i] = NULL;
3167 }
3168 }
3169
3170 if (!con_is_bound(defcsw)) {
3171 const struct consw *defconsw = conswitchp;
3172
3173 defcsw->con_startup();
3174 con_back->flag |= CON_DRIVER_FLAG_INIT;
3175 /*
3176 * vgacon may change the default driver to point
3177 * to dummycon, we restore it here...
3178 */
3179 conswitchp = defconsw;
3180 }
3181
3182 if (!con_is_bound(csw))
3183 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3184
3185 release_console_sem();
3186 /* ignore return value, binding should not fail */
3187 bind_con_driver(defcsw, first, last, deflt);
3188 err:
3189 module_put(owner);
3190 return retval;
3191
3192 }
3193 EXPORT_SYMBOL(unbind_con_driver);
3194
3195 static int vt_bind(struct con_driver *con)
3196 {
3197 const struct consw *defcsw = NULL, *csw = NULL;
3198 int i, more = 1, first = -1, last = -1, deflt = 0;
3199
3200 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3201 con_is_graphics(con->con, con->first, con->last))
3202 goto err;
3203
3204 csw = con->con;
3205
3206 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3207 struct con_driver *con = &registered_con_driver[i];
3208
3209 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3210 defcsw = con->con;
3211 break;
3212 }
3213 }
3214
3215 if (!defcsw)
3216 goto err;
3217
3218 while (more) {
3219 more = 0;
3220
3221 for (i = con->first; i <= con->last; i++) {
3222 if (con_driver_map[i] == defcsw) {
3223 if (first == -1)
3224 first = i;
3225 last = i;
3226 more = 1;
3227 } else if (first != -1)
3228 break;
3229 }
3230
3231 if (first == 0 && last == MAX_NR_CONSOLES -1)
3232 deflt = 1;
3233
3234 if (first != -1)
3235 bind_con_driver(csw, first, last, deflt);
3236
3237 first = -1;
3238 last = -1;
3239 deflt = 0;
3240 }
3241
3242 err:
3243 return 0;
3244 }
3245
3246 static int vt_unbind(struct con_driver *con)
3247 {
3248 const struct consw *csw = NULL;
3249 int i, more = 1, first = -1, last = -1, deflt = 0;
3250
3251 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3252 con_is_graphics(con->con, con->first, con->last))
3253 goto err;
3254
3255 csw = con->con;
3256
3257 while (more) {
3258 more = 0;
3259
3260 for (i = con->first; i <= con->last; i++) {
3261 if (con_driver_map[i] == csw) {
3262 if (first == -1)
3263 first = i;
3264 last = i;
3265 more = 1;
3266 } else if (first != -1)
3267 break;
3268 }
3269
3270 if (first == 0 && last == MAX_NR_CONSOLES -1)
3271 deflt = 1;
3272
3273 if (first != -1)
3274 unbind_con_driver(csw, first, last, deflt);
3275
3276 first = -1;
3277 last = -1;
3278 deflt = 0;
3279 }
3280
3281 err:
3282 return 0;
3283 }
3284 #else
3285 static inline int vt_bind(struct con_driver *con)
3286 {
3287 return 0;
3288 }
3289 static inline int vt_unbind(struct con_driver *con)
3290 {
3291 return 0;
3292 }
3293 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3294
3295 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3296 const char *buf, size_t count)
3297 {
3298 struct con_driver *con = dev_get_drvdata(dev);
3299 int bind = simple_strtoul(buf, NULL, 0);
3300
3301 if (bind)
3302 vt_bind(con);
3303 else
3304 vt_unbind(con);
3305
3306 return count;
3307 }
3308
3309 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3310 char *buf)
3311 {
3312 struct con_driver *con = dev_get_drvdata(dev);
3313 int bind = con_is_bound(con->con);
3314
3315 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3316 }
3317
3318 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3319 char *buf)
3320 {
3321 struct con_driver *con = dev_get_drvdata(dev);
3322
3323 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3324 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3325 con->desc);
3326
3327 }
3328
3329 static struct device_attribute device_attrs[] = {
3330 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3331 __ATTR(name, S_IRUGO, show_name, NULL),
3332 };
3333
3334 static int vtconsole_init_device(struct con_driver *con)
3335 {
3336 int i;
3337 int error = 0;
3338
3339 con->flag |= CON_DRIVER_FLAG_ATTR;
3340 dev_set_drvdata(con->dev, con);
3341 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3342 error = device_create_file(con->dev, &device_attrs[i]);
3343 if (error)
3344 break;
3345 }
3346
3347 if (error) {
3348 while (--i >= 0)
3349 device_remove_file(con->dev, &device_attrs[i]);
3350 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3351 }
3352
3353 return error;
3354 }
3355
3356 static void vtconsole_deinit_device(struct con_driver *con)
3357 {
3358 int i;
3359
3360 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3361 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3362 device_remove_file(con->dev, &device_attrs[i]);
3363 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3364 }
3365 }
3366
3367 /**
3368 * con_is_bound - checks if driver is bound to the console
3369 * @csw: console driver
3370 *
3371 * RETURNS: zero if unbound, nonzero if bound
3372 *
3373 * Drivers can call this and if zero, they should release
3374 * all resources allocated on con_startup()
3375 */
3376 int con_is_bound(const struct consw *csw)
3377 {
3378 int i, bound = 0;
3379
3380 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3381 if (con_driver_map[i] == csw) {
3382 bound = 1;
3383 break;
3384 }
3385 }
3386
3387 return bound;
3388 }
3389 EXPORT_SYMBOL(con_is_bound);
3390
3391 /**
3392 * register_con_driver - register console driver to console layer
3393 * @csw: console driver
3394 * @first: the first console to take over, minimum value is 0
3395 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3396 *
3397 * DESCRIPTION: This function registers a console driver which can later
3398 * bind to a range of consoles specified by @first and @last. It will
3399 * also initialize the console driver by calling con_startup().
3400 */
3401 int register_con_driver(const struct consw *csw, int first, int last)
3402 {
3403 struct module *owner = csw->owner;
3404 struct con_driver *con_driver;
3405 const char *desc;
3406 int i, retval = 0;
3407
3408 if (!try_module_get(owner))
3409 return -ENODEV;
3410
3411 acquire_console_sem();
3412
3413 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3414 con_driver = &registered_con_driver[i];
3415
3416 /* already registered */
3417 if (con_driver->con == csw)
3418 retval = -EINVAL;
3419 }
3420
3421 if (retval)
3422 goto err;
3423
3424 desc = csw->con_startup();
3425
3426 if (!desc)
3427 goto err;
3428
3429 retval = -EINVAL;
3430
3431 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3432 con_driver = &registered_con_driver[i];
3433
3434 if (con_driver->con == NULL) {
3435 con_driver->con = csw;
3436 con_driver->desc = desc;
3437 con_driver->node = i;
3438 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3439 CON_DRIVER_FLAG_INIT;
3440 con_driver->first = first;
3441 con_driver->last = last;
3442 retval = 0;
3443 break;
3444 }
3445 }
3446
3447 if (retval)
3448 goto err;
3449
3450 con_driver->dev = device_create(vtconsole_class, NULL,
3451 MKDEV(0, con_driver->node),
3452 NULL, "vtcon%i",
3453 con_driver->node);
3454
3455 if (IS_ERR(con_driver->dev)) {
3456 printk(KERN_WARNING "Unable to create device for %s; "
3457 "errno = %ld\n", con_driver->desc,
3458 PTR_ERR(con_driver->dev));
3459 con_driver->dev = NULL;
3460 } else {
3461 vtconsole_init_device(con_driver);
3462 }
3463
3464 err:
3465 release_console_sem();
3466 module_put(owner);
3467 return retval;
3468 }
3469 EXPORT_SYMBOL(register_con_driver);
3470
3471 /**
3472 * unregister_con_driver - unregister console driver from console layer
3473 * @csw: console driver
3474 *
3475 * DESCRIPTION: All drivers that registers to the console layer must
3476 * call this function upon exit, or if the console driver is in a state
3477 * where it won't be able to handle console services, such as the
3478 * framebuffer console without loaded framebuffer drivers.
3479 *
3480 * The driver must unbind first prior to unregistration.
3481 */
3482 int unregister_con_driver(const struct consw *csw)
3483 {
3484 int i, retval = -ENODEV;
3485
3486 acquire_console_sem();
3487
3488 /* cannot unregister a bound driver */
3489 if (con_is_bound(csw))
3490 goto err;
3491
3492 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3493 struct con_driver *con_driver = &registered_con_driver[i];
3494
3495 if (con_driver->con == csw &&
3496 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3497 vtconsole_deinit_device(con_driver);
3498 device_destroy(vtconsole_class,
3499 MKDEV(0, con_driver->node));
3500 con_driver->con = NULL;
3501 con_driver->desc = NULL;
3502 con_driver->dev = NULL;
3503 con_driver->node = 0;
3504 con_driver->flag = 0;
3505 con_driver->first = 0;
3506 con_driver->last = 0;
3507 retval = 0;
3508 break;
3509 }
3510 }
3511 err:
3512 release_console_sem();
3513 return retval;
3514 }
3515 EXPORT_SYMBOL(unregister_con_driver);
3516
3517 /*
3518 * If we support more console drivers, this function is used
3519 * when a driver wants to take over some existing consoles
3520 * and become default driver for newly opened ones.
3521 *
3522 * take_over_console is basically a register followed by unbind
3523 */
3524 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3525 {
3526 int err;
3527
3528 err = register_con_driver(csw, first, last);
3529
3530 if (!err)
3531 bind_con_driver(csw, first, last, deflt);
3532
3533 return err;
3534 }
3535
3536 /*
3537 * give_up_console is a wrapper to unregister_con_driver. It will only
3538 * work if driver is fully unbound.
3539 */
3540 void give_up_console(const struct consw *csw)
3541 {
3542 unregister_con_driver(csw);
3543 }
3544
3545 static int __init vtconsole_class_init(void)
3546 {
3547 int i;
3548
3549 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3550 if (IS_ERR(vtconsole_class)) {
3551 printk(KERN_WARNING "Unable to create vt console class; "
3552 "errno = %ld\n", PTR_ERR(vtconsole_class));
3553 vtconsole_class = NULL;
3554 }
3555
3556 /* Add system drivers to sysfs */
3557 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3558 struct con_driver *con = &registered_con_driver[i];
3559
3560 if (con->con && !con->dev) {
3561 con->dev = device_create(vtconsole_class, NULL,
3562 MKDEV(0, con->node),
3563 NULL, "vtcon%i",
3564 con->node);
3565
3566 if (IS_ERR(con->dev)) {
3567 printk(KERN_WARNING "Unable to create "
3568 "device for %s; errno = %ld\n",
3569 con->desc, PTR_ERR(con->dev));
3570 con->dev = NULL;
3571 } else {
3572 vtconsole_init_device(con);
3573 }
3574 }
3575 }
3576
3577 return 0;
3578 }
3579 postcore_initcall(vtconsole_class_init);
3580
3581 #endif
3582
3583 /*
3584 * Screen blanking
3585 */
3586
3587 static int set_vesa_blanking(char __user *p)
3588 {
3589 unsigned int mode;
3590
3591 if (get_user(mode, p + 1))
3592 return -EFAULT;
3593
3594 vesa_blank_mode = (mode < 4) ? mode : 0;
3595 return 0;
3596 }
3597
3598 void do_blank_screen(int entering_gfx)
3599 {
3600 struct vc_data *vc = vc_cons[fg_console].d;
3601 int i;
3602
3603 WARN_CONSOLE_UNLOCKED();
3604
3605 if (console_blanked) {
3606 if (blank_state == blank_vesa_wait) {
3607 blank_state = blank_off;
3608 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3609 }
3610 return;
3611 }
3612
3613 /* entering graphics mode? */
3614 if (entering_gfx) {
3615 hide_cursor(vc);
3616 save_screen(vc);
3617 vc->vc_sw->con_blank(vc, -1, 1);
3618 console_blanked = fg_console + 1;
3619 blank_state = blank_off;
3620 set_origin(vc);
3621 return;
3622 }
3623
3624 if (blank_state != blank_normal_wait)
3625 return;
3626 blank_state = blank_off;
3627
3628 /* don't blank graphics */
3629 if (vc->vc_mode != KD_TEXT) {
3630 console_blanked = fg_console + 1;
3631 return;
3632 }
3633
3634 hide_cursor(vc);
3635 del_timer_sync(&console_timer);
3636 blank_timer_expired = 0;
3637
3638 save_screen(vc);
3639 /* In case we need to reset origin, blanking hook returns 1 */
3640 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3641 console_blanked = fg_console + 1;
3642 if (i)
3643 set_origin(vc);
3644
3645 if (console_blank_hook && console_blank_hook(1))
3646 return;
3647
3648 if (vesa_off_interval && vesa_blank_mode) {
3649 blank_state = blank_vesa_wait;
3650 mod_timer(&console_timer, jiffies + vesa_off_interval);
3651 }
3652 }
3653 EXPORT_SYMBOL(do_blank_screen);
3654
3655 /*
3656 * Called by timer as well as from vt_console_driver
3657 */
3658 void do_unblank_screen(int leaving_gfx)
3659 {
3660 struct vc_data *vc;
3661
3662 /* This should now always be called from a "sane" (read: can schedule)
3663 * context for the sake of the low level drivers, except in the special
3664 * case of oops_in_progress
3665 */
3666 if (!oops_in_progress)
3667 might_sleep();
3668
3669 WARN_CONSOLE_UNLOCKED();
3670
3671 ignore_poke = 0;
3672 if (!console_blanked)
3673 return;
3674 if (!vc_cons_allocated(fg_console)) {
3675 /* impossible */
3676 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3677 return;
3678 }
3679 vc = vc_cons[fg_console].d;
3680 if (vc->vc_mode != KD_TEXT)
3681 return; /* but leave console_blanked != 0 */
3682
3683 if (blankinterval) {
3684 mod_timer(&console_timer, jiffies + blankinterval);
3685 blank_state = blank_normal_wait;
3686 }
3687
3688 console_blanked = 0;
3689 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3690 /* Low-level driver cannot restore -> do it ourselves */
3691 update_screen(vc);
3692 if (console_blank_hook)
3693 console_blank_hook(0);
3694 set_palette(vc);
3695 set_cursor(vc);
3696 }
3697 EXPORT_SYMBOL(do_unblank_screen);
3698
3699 /*
3700 * This is called by the outside world to cause a forced unblank, mostly for
3701 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3702 * call it with 1 as an argument and so force a mode restore... that may kill
3703 * X or at least garbage the screen but would also make the Oops visible...
3704 */
3705 void unblank_screen(void)
3706 {
3707 do_unblank_screen(0);
3708 }
3709
3710 /*
3711 * We defer the timer blanking to work queue so it can take the console mutex
3712 * (console operations can still happen at irq time, but only from printk which
3713 * has the console mutex. Not perfect yet, but better than no locking
3714 */
3715 static void blank_screen_t(unsigned long dummy)
3716 {
3717 if (unlikely(!keventd_up())) {
3718 mod_timer(&console_timer, jiffies + blankinterval);
3719 return;
3720 }
3721 blank_timer_expired = 1;
3722 schedule_work(&console_work);
3723 }
3724
3725 void poke_blanked_console(void)
3726 {
3727 WARN_CONSOLE_UNLOCKED();
3728
3729 /* Add this so we quickly catch whoever might call us in a non
3730 * safe context. Nowadays, unblank_screen() isn't to be called in
3731 * atomic contexts and is allowed to schedule (with the special case
3732 * of oops_in_progress, but that isn't of any concern for this
3733 * function. --BenH.
3734 */
3735 might_sleep();
3736
3737 /* This isn't perfectly race free, but a race here would be mostly harmless,
3738 * at worse, we'll do a spurrious blank and it's unlikely
3739 */
3740 del_timer(&console_timer);
3741 blank_timer_expired = 0;
3742
3743 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3744 return;
3745 if (console_blanked)
3746 unblank_screen();
3747 else if (blankinterval) {
3748 mod_timer(&console_timer, jiffies + blankinterval);
3749 blank_state = blank_normal_wait;
3750 }
3751 }
3752
3753 /*
3754 * Palettes
3755 */
3756
3757 static void set_palette(struct vc_data *vc)
3758 {
3759 WARN_CONSOLE_UNLOCKED();
3760
3761 if (vc->vc_mode != KD_GRAPHICS)
3762 vc->vc_sw->con_set_palette(vc, color_table);
3763 }
3764
3765 static int set_get_cmap(unsigned char __user *arg, int set)
3766 {
3767 int i, j, k;
3768
3769 WARN_CONSOLE_UNLOCKED();
3770
3771 for (i = 0; i < 16; i++)
3772 if (set) {
3773 get_user(default_red[i], arg++);
3774 get_user(default_grn[i], arg++);
3775 get_user(default_blu[i], arg++);
3776 } else {
3777 put_user(default_red[i], arg++);
3778 put_user(default_grn[i], arg++);
3779 put_user(default_blu[i], arg++);
3780 }
3781 if (set) {
3782 for (i = 0; i < MAX_NR_CONSOLES; i++)
3783 if (vc_cons_allocated(i)) {
3784 for (j = k = 0; j < 16; j++) {
3785 vc_cons[i].d->vc_palette[k++] = default_red[j];
3786 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3787 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3788 }
3789 set_palette(vc_cons[i].d);
3790 }
3791 }
3792 return 0;
3793 }
3794
3795 /*
3796 * Load palette into the DAC registers. arg points to a colour
3797 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3798 */
3799
3800 int con_set_cmap(unsigned char __user *arg)
3801 {
3802 int rc;
3803
3804 acquire_console_sem();
3805 rc = set_get_cmap (arg,1);
3806 release_console_sem();
3807
3808 return rc;
3809 }
3810
3811 int con_get_cmap(unsigned char __user *arg)
3812 {
3813 int rc;
3814
3815 acquire_console_sem();
3816 rc = set_get_cmap (arg,0);
3817 release_console_sem();
3818
3819 return rc;
3820 }
3821
3822 void reset_palette(struct vc_data *vc)
3823 {
3824 int j, k;
3825 for (j=k=0; j<16; j++) {
3826 vc->vc_palette[k++] = default_red[j];
3827 vc->vc_palette[k++] = default_grn[j];
3828 vc->vc_palette[k++] = default_blu[j];
3829 }
3830 set_palette(vc);
3831 }
3832
3833 /*
3834 * Font switching
3835 *
3836 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3837 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3838 * depending on width) reserved for each character which is kinda wasty, but
3839 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3840 * is upto the actual low-level console-driver convert data into its favorite
3841 * format (maybe we should add a `fontoffset' field to the `display'
3842 * structure so we won't have to convert the fontdata all the time.
3843 * /Jes
3844 */
3845
3846 #define max_font_size 65536
3847
3848 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3849 {
3850 struct console_font font;
3851 int rc = -EINVAL;
3852 int c;
3853
3854 if (vc->vc_mode != KD_TEXT)
3855 return -EINVAL;
3856
3857 if (op->data) {
3858 font.data = kmalloc(max_font_size, GFP_KERNEL);
3859 if (!font.data)
3860 return -ENOMEM;
3861 } else
3862 font.data = NULL;
3863
3864 acquire_console_sem();
3865 if (vc->vc_sw->con_font_get)
3866 rc = vc->vc_sw->con_font_get(vc, &font);
3867 else
3868 rc = -ENOSYS;
3869 release_console_sem();
3870
3871 if (rc)
3872 goto out;
3873
3874 c = (font.width+7)/8 * 32 * font.charcount;
3875
3876 if (op->data && font.charcount > op->charcount)
3877 rc = -ENOSPC;
3878 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3879 if (font.width > op->width || font.height > op->height)
3880 rc = -ENOSPC;
3881 } else {
3882 if (font.width != 8)
3883 rc = -EIO;
3884 else if ((op->height && font.height > op->height) ||
3885 font.height > 32)
3886 rc = -ENOSPC;
3887 }
3888 if (rc)
3889 goto out;
3890
3891 op->height = font.height;
3892 op->width = font.width;
3893 op->charcount = font.charcount;
3894
3895 if (op->data && copy_to_user(op->data, font.data, c))
3896 rc = -EFAULT;
3897
3898 out:
3899 kfree(font.data);
3900 return rc;
3901 }
3902
3903 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3904 {
3905 struct console_font font;
3906 int rc = -EINVAL;
3907 int size;
3908
3909 if (vc->vc_mode != KD_TEXT)
3910 return -EINVAL;
3911 if (!op->data)
3912 return -EINVAL;
3913 if (op->charcount > 512)
3914 return -EINVAL;
3915 if (!op->height) { /* Need to guess font height [compat] */
3916 int h, i;
3917 u8 __user *charmap = op->data;
3918 u8 tmp;
3919
3920 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3921 so that we can get rid of this soon */
3922 if (!(op->flags & KD_FONT_FLAG_OLD))
3923 return -EINVAL;
3924 for (h = 32; h > 0; h--)
3925 for (i = 0; i < op->charcount; i++) {
3926 if (get_user(tmp, &charmap[32*i+h-1]))
3927 return -EFAULT;
3928 if (tmp)
3929 goto nonzero;
3930 }
3931 return -EINVAL;
3932 nonzero:
3933 op->height = h;
3934 }
3935 if (op->width <= 0 || op->width > 32 || op->height > 32)
3936 return -EINVAL;
3937 size = (op->width+7)/8 * 32 * op->charcount;
3938 if (size > max_font_size)
3939 return -ENOSPC;
3940 font.charcount = op->charcount;
3941 font.height = op->height;
3942 font.width = op->width;
3943 font.data = kmalloc(size, GFP_KERNEL);
3944 if (!font.data)
3945 return -ENOMEM;
3946 if (copy_from_user(font.data, op->data, size)) {
3947 kfree(font.data);
3948 return -EFAULT;
3949 }
3950 acquire_console_sem();
3951 if (vc->vc_sw->con_font_set)
3952 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3953 else
3954 rc = -ENOSYS;
3955 release_console_sem();
3956 kfree(font.data);
3957 return rc;
3958 }
3959
3960 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3961 {
3962 struct console_font font = {.width = op->width, .height = op->height};
3963 char name[MAX_FONT_NAME];
3964 char *s = name;
3965 int rc;
3966
3967 if (vc->vc_mode != KD_TEXT)
3968 return -EINVAL;
3969
3970 if (!op->data)
3971 s = NULL;
3972 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3973 return -EFAULT;
3974 else
3975 name[MAX_FONT_NAME - 1] = 0;
3976
3977 acquire_console_sem();
3978 if (vc->vc_sw->con_font_default)
3979 rc = vc->vc_sw->con_font_default(vc, &font, s);
3980 else
3981 rc = -ENOSYS;
3982 release_console_sem();
3983 if (!rc) {
3984 op->width = font.width;
3985 op->height = font.height;
3986 }
3987 return rc;
3988 }
3989
3990 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3991 {
3992 int con = op->height;
3993 int rc;
3994
3995 if (vc->vc_mode != KD_TEXT)
3996 return -EINVAL;
3997
3998 acquire_console_sem();
3999 if (!vc->vc_sw->con_font_copy)
4000 rc = -ENOSYS;
4001 else if (con < 0 || !vc_cons_allocated(con))
4002 rc = -ENOTTY;
4003 else if (con == vc->vc_num) /* nothing to do */
4004 rc = 0;
4005 else
4006 rc = vc->vc_sw->con_font_copy(vc, con);
4007 release_console_sem();
4008 return rc;
4009 }
4010
4011 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4012 {
4013 switch (op->op) {
4014 case KD_FONT_OP_SET:
4015 return con_font_set(vc, op);
4016 case KD_FONT_OP_GET:
4017 return con_font_get(vc, op);
4018 case KD_FONT_OP_SET_DEFAULT:
4019 return con_font_default(vc, op);
4020 case KD_FONT_OP_COPY:
4021 return con_font_copy(vc, op);
4022 }
4023 return -ENOSYS;
4024 }
4025
4026 /*
4027 * Interface exported to selection and vcs.
4028 */
4029
4030 /* used by selection */
4031 u16 screen_glyph(struct vc_data *vc, int offset)
4032 {
4033 u16 w = scr_readw(screenpos(vc, offset, 1));
4034 u16 c = w & 0xff;
4035
4036 if (w & vc->vc_hi_font_mask)
4037 c |= 0x100;
4038 return c;
4039 }
4040 EXPORT_SYMBOL_GPL(screen_glyph);
4041
4042 /* used by vcs - note the word offset */
4043 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4044 {
4045 return screenpos(vc, 2 * w_offset, viewed);
4046 }
4047
4048 void getconsxy(struct vc_data *vc, unsigned char *p)
4049 {
4050 p[0] = vc->vc_x;
4051 p[1] = vc->vc_y;
4052 }
4053
4054 void putconsxy(struct vc_data *vc, unsigned char *p)
4055 {
4056 hide_cursor(vc);
4057 gotoxy(vc, p[0], p[1]);
4058 set_cursor(vc);
4059 }
4060
4061 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4062 {
4063 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4064 return softcursor_original;
4065 return scr_readw(org);
4066 }
4067
4068 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4069 {
4070 scr_writew(val, org);
4071 if ((unsigned long)org == vc->vc_pos) {
4072 softcursor_original = -1;
4073 add_softcursor(vc);
4074 }
4075 }
4076
4077 /*
4078 * Visible symbols for modules
4079 */
4080
4081 EXPORT_SYMBOL(color_table);
4082 EXPORT_SYMBOL(default_red);
4083 EXPORT_SYMBOL(default_grn);
4084 EXPORT_SYMBOL(default_blu);
4085 EXPORT_SYMBOL(update_region);
4086 EXPORT_SYMBOL(redraw_screen);
4087 EXPORT_SYMBOL(vc_resize);
4088 EXPORT_SYMBOL(fg_console);
4089 EXPORT_SYMBOL(console_blank_hook);
4090 EXPORT_SYMBOL(console_blanked);
4091 EXPORT_SYMBOL(vc_cons);
4092 #ifndef VT_SINGLE_DRIVER
4093 EXPORT_SYMBOL(take_over_console);
4094 EXPORT_SYMBOL(give_up_console);
4095 #endif
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