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console ASCII glyph 1:1 mapping
[linux-2.6/zen-sources.git] / drivers / char / vt.c
blob008176edbd64511148ac5e1e40d21d3fbf1883d5
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 tty_struct *real_tty,
823 struct vc_data *vc, 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, real_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->vc_tty, vc, cols, rows);
958 }
959
960 /**
961 * vt_resize - resize a VT
962 * @tty: tty to resize
963 * @real_tty: tty if a pty/tty pair
964 * @ws: winsize attributes
965 *
966 * Resize a virtual terminal. This is called by the tty layer as we
967 * register our own handler for resizing. The mutual helper does all
968 * the actual work.
969 *
970 * Takes the console sem and the called methods then take the tty
971 * termios_mutex and the tty ctrl_lock in that order.
972 */
973
974 int vt_resize(struct tty_struct *tty, struct tty_struct *real_tty,
975 struct winsize *ws)
976 {
977 struct vc_data *vc = tty->driver_data;
978 int ret;
979
980 acquire_console_sem();
981 ret = vc_do_resize(tty, real_tty, vc, ws->ws_col, ws->ws_row);
982 release_console_sem();
983 return ret;
984 }
985
986 void vc_deallocate(unsigned int currcons)
987 {
988 WARN_CONSOLE_UNLOCKED();
989
990 if (vc_cons_allocated(currcons)) {
991 struct vc_data *vc = vc_cons[currcons].d;
992 struct vt_notifier_param param = { .vc = vc };
993 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
994 vc->vc_sw->con_deinit(vc);
995 put_pid(vc->vt_pid);
996 module_put(vc->vc_sw->owner);
997 if (vc->vc_kmalloced)
998 kfree(vc->vc_screenbuf);
999 if (currcons >= MIN_NR_CONSOLES)
1000 kfree(vc);
1001 vc_cons[currcons].d = NULL;
1002 }
1003 }
1004
1005 /*
1006 * VT102 emulator
1007 */
1008
1009 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1010 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1011 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1012
1013 #define decarm VC_REPEAT
1014 #define decckm VC_CKMODE
1015 #define kbdapplic VC_APPLIC
1016 #define lnm VC_CRLF
1017
1018 /*
1019 * this is what the terminal answers to a ESC-Z or csi0c query.
1020 */
1021 #define VT100ID "\033[?1;2c"
1022 #define VT102ID "\033[?6c"
1023
1024 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1025 8,12,10,14, 9,13,11,15 };
1026
1027 /* the default colour table, for VGA+ colour systems */
1028 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1029 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1030 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1031 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1032 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1033 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1034
1035 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1036 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1037 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1038
1039 /*
1040 * gotoxy() must verify all boundaries, because the arguments
1041 * might also be negative. If the given position is out of
1042 * bounds, the cursor is placed at the nearest margin.
1043 */
1044 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1045 {
1046 int min_y, max_y;
1047
1048 if (new_x < 0)
1049 vc->vc_x = 0;
1050 else {
1051 if (new_x >= vc->vc_cols)
1052 vc->vc_x = vc->vc_cols - 1;
1053 else
1054 vc->vc_x = new_x;
1055 }
1056
1057 if (vc->vc_decom) {
1058 min_y = vc->vc_top;
1059 max_y = vc->vc_bottom;
1060 } else {
1061 min_y = 0;
1062 max_y = vc->vc_rows;
1063 }
1064 if (new_y < min_y)
1065 vc->vc_y = min_y;
1066 else if (new_y >= max_y)
1067 vc->vc_y = max_y - 1;
1068 else
1069 vc->vc_y = new_y;
1070 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1071 vc->vc_need_wrap = 0;
1072 }
1073
1074 /* for absolute user moves, when decom is set */
1075 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1076 {
1077 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1078 }
1079
1080 void scrollback(struct vc_data *vc, int lines)
1081 {
1082 if (!lines)
1083 lines = vc->vc_rows / 2;
1084 scrolldelta(-lines);
1085 }
1086
1087 void scrollfront(struct vc_data *vc, int lines)
1088 {
1089 if (!lines)
1090 lines = vc->vc_rows / 2;
1091 scrolldelta(lines);
1092 }
1093
1094 static void lf(struct vc_data *vc)
1095 {
1096 /* don't scroll if above bottom of scrolling region, or
1097 * if below scrolling region
1098 */
1099 if (vc->vc_y + 1 == vc->vc_bottom)
1100 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1101 else if (vc->vc_y < vc->vc_rows - 1) {
1102 vc->vc_y++;
1103 vc->vc_pos += vc->vc_size_row;
1104 }
1105 vc->vc_need_wrap = 0;
1106 notify_write(vc, '\n');
1107 }
1108
1109 static void ri(struct vc_data *vc)
1110 {
1111 /* don't scroll if below top of scrolling region, or
1112 * if above scrolling region
1113 */
1114 if (vc->vc_y == vc->vc_top)
1115 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1116 else if (vc->vc_y > 0) {
1117 vc->vc_y--;
1118 vc->vc_pos -= vc->vc_size_row;
1119 }
1120 vc->vc_need_wrap = 0;
1121 }
1122
1123 static inline void cr(struct vc_data *vc)
1124 {
1125 vc->vc_pos -= vc->vc_x << 1;
1126 vc->vc_need_wrap = vc->vc_x = 0;
1127 notify_write(vc, '\r');
1128 }
1129
1130 static inline void bs(struct vc_data *vc)
1131 {
1132 if (vc->vc_x) {
1133 vc->vc_pos -= 2;
1134 vc->vc_x--;
1135 vc->vc_need_wrap = 0;
1136 notify_write(vc, '\b');
1137 }
1138 }
1139
1140 static inline void del(struct vc_data *vc)
1141 {
1142 /* ignored */
1143 }
1144
1145 static void csi_J(struct vc_data *vc, int vpar)
1146 {
1147 unsigned int count;
1148 unsigned short * start;
1149
1150 switch (vpar) {
1151 case 0: /* erase from cursor to end of display */
1152 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1153 start = (unsigned short *)vc->vc_pos;
1154 if (DO_UPDATE(vc)) {
1155 /* do in two stages */
1156 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1157 vc->vc_cols - vc->vc_x);
1158 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1159 vc->vc_rows - vc->vc_y - 1,
1160 vc->vc_cols);
1161 }
1162 break;
1163 case 1: /* erase from start to cursor */
1164 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1165 start = (unsigned short *)vc->vc_origin;
1166 if (DO_UPDATE(vc)) {
1167 /* do in two stages */
1168 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1169 vc->vc_cols);
1170 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1171 vc->vc_x + 1);
1172 }
1173 break;
1174 case 2: /* erase whole display */
1175 count = vc->vc_cols * vc->vc_rows;
1176 start = (unsigned short *)vc->vc_origin;
1177 if (DO_UPDATE(vc))
1178 vc->vc_sw->con_clear(vc, 0, 0,
1179 vc->vc_rows,
1180 vc->vc_cols);
1181 break;
1182 default:
1183 return;
1184 }
1185 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1186 vc->vc_need_wrap = 0;
1187 }
1188
1189 static void csi_K(struct vc_data *vc, int vpar)
1190 {
1191 unsigned int count;
1192 unsigned short * start;
1193
1194 switch (vpar) {
1195 case 0: /* erase from cursor to end of line */
1196 count = vc->vc_cols - vc->vc_x;
1197 start = (unsigned short *)vc->vc_pos;
1198 if (DO_UPDATE(vc))
1199 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1200 vc->vc_cols - vc->vc_x);
1201 break;
1202 case 1: /* erase from start of line to cursor */
1203 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1204 count = vc->vc_x + 1;
1205 if (DO_UPDATE(vc))
1206 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1207 vc->vc_x + 1);
1208 break;
1209 case 2: /* erase whole line */
1210 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1211 count = vc->vc_cols;
1212 if (DO_UPDATE(vc))
1213 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1214 vc->vc_cols);
1215 break;
1216 default:
1217 return;
1218 }
1219 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1220 vc->vc_need_wrap = 0;
1221 }
1222
1223 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1224 { /* not vt100? */
1225 int count;
1226
1227 if (!vpar)
1228 vpar++;
1229 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1230
1231 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1232 if (DO_UPDATE(vc))
1233 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1234 vc->vc_need_wrap = 0;
1235 }
1236
1237 static void default_attr(struct vc_data *vc)
1238 {
1239 vc->vc_intensity = 1;
1240 vc->vc_italic = 0;
1241 vc->vc_underline = 0;
1242 vc->vc_reverse = 0;
1243 vc->vc_blink = 0;
1244 vc->vc_color = vc->vc_def_color;
1245 }
1246
1247 /* console_sem is held */
1248 static void csi_m(struct vc_data *vc)
1249 {
1250 int i;
1251
1252 for (i = 0; i <= vc->vc_npar; i++)
1253 switch (vc->vc_par[i]) {
1254 case 0: /* all attributes off */
1255 default_attr(vc);
1256 break;
1257 case 1:
1258 vc->vc_intensity = 2;
1259 break;
1260 case 2:
1261 vc->vc_intensity = 0;
1262 break;
1263 case 3:
1264 vc->vc_italic = 1;
1265 break;
1266 case 4:
1267 vc->vc_underline = 1;
1268 break;
1269 case 5:
1270 vc->vc_blink = 1;
1271 break;
1272 case 7:
1273 vc->vc_reverse = 1;
1274 break;
1275 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1276 * Select primary font, don't display
1277 * control chars if defined, don't set
1278 * bit 8 on output.
1279 */
1280 vc->vc_translate = set_translate(vc->vc_charset == 0
1281 ? vc->vc_G0_charset
1282 : vc->vc_G1_charset, vc);
1283 vc->vc_disp_ctrl = 0;
1284 vc->vc_toggle_meta = 0;
1285 break;
1286 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1287 * Select first alternate font, lets
1288 * chars < 32 be displayed as ROM chars.
1289 */
1290 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1291 vc->vc_disp_ctrl = 1;
1292 vc->vc_toggle_meta = 0;
1293 break;
1294 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1295 * Select second alternate font, toggle
1296 * high bit before displaying as ROM char.
1297 */
1298 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1299 vc->vc_disp_ctrl = 1;
1300 vc->vc_toggle_meta = 1;
1301 break;
1302 case 21:
1303 case 22:
1304 vc->vc_intensity = 1;
1305 break;
1306 case 23:
1307 vc->vc_italic = 0;
1308 break;
1309 case 24:
1310 vc->vc_underline = 0;
1311 break;
1312 case 25:
1313 vc->vc_blink = 0;
1314 break;
1315 case 27:
1316 vc->vc_reverse = 0;
1317 break;
1318 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1319 * Enables underscore, white foreground
1320 * with white underscore (Linux - use
1321 * default foreground).
1322 */
1323 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1324 vc->vc_underline = 1;
1325 break;
1326 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1327 * Disable underline option.
1328 * Reset colour to default? It did this
1329 * before...
1330 */
1331 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1332 vc->vc_underline = 0;
1333 break;
1334 case 49:
1335 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1336 break;
1337 default:
1338 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1339 vc->vc_color = color_table[vc->vc_par[i] - 30]
1340 | (vc->vc_color & 0xf0);
1341 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1342 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1343 | (vc->vc_color & 0x0f);
1344 break;
1345 }
1346 update_attr(vc);
1347 }
1348
1349 static void respond_string(const char *p, struct tty_struct *tty)
1350 {
1351 while (*p) {
1352 tty_insert_flip_char(tty, *p, 0);
1353 p++;
1354 }
1355 con_schedule_flip(tty);
1356 }
1357
1358 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1359 {
1360 char buf[40];
1361
1362 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1363 respond_string(buf, tty);
1364 }
1365
1366 static inline void status_report(struct tty_struct *tty)
1367 {
1368 respond_string("\033[0n", tty); /* Terminal ok */
1369 }
1370
1371 static inline void respond_ID(struct tty_struct * tty)
1372 {
1373 respond_string(VT102ID, tty);
1374 }
1375
1376 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1377 {
1378 char buf[8];
1379
1380 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1381 (char)('!' + mry));
1382 respond_string(buf, tty);
1383 }
1384
1385 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1386 int mouse_reporting(void)
1387 {
1388 return vc_cons[fg_console].d->vc_report_mouse;
1389 }
1390
1391 /* console_sem is held */
1392 static void set_mode(struct vc_data *vc, int on_off)
1393 {
1394 int i;
1395
1396 for (i = 0; i <= vc->vc_npar; i++)
1397 if (vc->vc_ques) {
1398 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1399 case 1: /* Cursor keys send ^[Ox/^[[x */
1400 if (on_off)
1401 set_kbd(vc, decckm);
1402 else
1403 clr_kbd(vc, decckm);
1404 break;
1405 case 3: /* 80/132 mode switch unimplemented */
1406 vc->vc_deccolm = on_off;
1407 #if 0
1408 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1409 /* this alone does not suffice; some user mode
1410 utility has to change the hardware regs */
1411 #endif
1412 break;
1413 case 5: /* Inverted screen on/off */
1414 if (vc->vc_decscnm != on_off) {
1415 vc->vc_decscnm = on_off;
1416 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1417 update_attr(vc);
1418 }
1419 break;
1420 case 6: /* Origin relative/absolute */
1421 vc->vc_decom = on_off;
1422 gotoxay(vc, 0, 0);
1423 break;
1424 case 7: /* Autowrap on/off */
1425 vc->vc_decawm = on_off;
1426 break;
1427 case 8: /* Autorepeat on/off */
1428 if (on_off)
1429 set_kbd(vc, decarm);
1430 else
1431 clr_kbd(vc, decarm);
1432 break;
1433 case 9:
1434 vc->vc_report_mouse = on_off ? 1 : 0;
1435 break;
1436 case 25: /* Cursor on/off */
1437 vc->vc_deccm = on_off;
1438 break;
1439 case 1000:
1440 vc->vc_report_mouse = on_off ? 2 : 0;
1441 break;
1442 }
1443 } else {
1444 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1445 case 3: /* Monitor (display ctrls) */
1446 vc->vc_disp_ctrl = on_off;
1447 break;
1448 case 4: /* Insert Mode on/off */
1449 vc->vc_decim = on_off;
1450 break;
1451 case 20: /* Lf, Enter == CrLf/Lf */
1452 if (on_off)
1453 set_kbd(vc, lnm);
1454 else
1455 clr_kbd(vc, lnm);
1456 break;
1457 }
1458 }
1459 }
1460
1461 /* console_sem is held */
1462 static void setterm_command(struct vc_data *vc)
1463 {
1464 switch(vc->vc_par[0]) {
1465 case 1: /* set color for underline mode */
1466 if (vc->vc_can_do_color &&
1467 vc->vc_par[1] < 16) {
1468 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1469 if (vc->vc_underline)
1470 update_attr(vc);
1471 }
1472 break;
1473 case 2: /* set color for half intensity mode */
1474 if (vc->vc_can_do_color &&
1475 vc->vc_par[1] < 16) {
1476 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1477 if (vc->vc_intensity == 0)
1478 update_attr(vc);
1479 }
1480 break;
1481 case 8: /* store colors as defaults */
1482 vc->vc_def_color = vc->vc_attr;
1483 if (vc->vc_hi_font_mask == 0x100)
1484 vc->vc_def_color >>= 1;
1485 default_attr(vc);
1486 update_attr(vc);
1487 break;
1488 case 9: /* set blanking interval */
1489 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1490 poke_blanked_console();
1491 break;
1492 case 10: /* set bell frequency in Hz */
1493 if (vc->vc_npar >= 1)
1494 vc->vc_bell_pitch = vc->vc_par[1];
1495 else
1496 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1497 break;
1498 case 11: /* set bell duration in msec */
1499 if (vc->vc_npar >= 1)
1500 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1501 vc->vc_par[1] * HZ / 1000 : 0;
1502 else
1503 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1504 break;
1505 case 12: /* bring specified console to the front */
1506 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1507 set_console(vc->vc_par[1] - 1);
1508 break;
1509 case 13: /* unblank the screen */
1510 poke_blanked_console();
1511 break;
1512 case 14: /* set vesa powerdown interval */
1513 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1514 break;
1515 case 15: /* activate the previous console */
1516 set_console(last_console);
1517 break;
1518 }
1519 }
1520
1521 /* console_sem is held */
1522 static void csi_at(struct vc_data *vc, unsigned int nr)
1523 {
1524 if (nr > vc->vc_cols - vc->vc_x)
1525 nr = vc->vc_cols - vc->vc_x;
1526 else if (!nr)
1527 nr = 1;
1528 insert_char(vc, nr);
1529 }
1530
1531 /* console_sem is held */
1532 static void csi_L(struct vc_data *vc, unsigned int nr)
1533 {
1534 if (nr > vc->vc_rows - vc->vc_y)
1535 nr = vc->vc_rows - vc->vc_y;
1536 else if (!nr)
1537 nr = 1;
1538 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1539 vc->vc_need_wrap = 0;
1540 }
1541
1542 /* console_sem is held */
1543 static void csi_P(struct vc_data *vc, unsigned int nr)
1544 {
1545 if (nr > vc->vc_cols - vc->vc_x)
1546 nr = vc->vc_cols - vc->vc_x;
1547 else if (!nr)
1548 nr = 1;
1549 delete_char(vc, nr);
1550 }
1551
1552 /* console_sem is held */
1553 static void csi_M(struct vc_data *vc, unsigned int nr)
1554 {
1555 if (nr > vc->vc_rows - vc->vc_y)
1556 nr = vc->vc_rows - vc->vc_y;
1557 else if (!nr)
1558 nr=1;
1559 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1560 vc->vc_need_wrap = 0;
1561 }
1562
1563 /* console_sem is held (except via vc_init->reset_terminal */
1564 static void save_cur(struct vc_data *vc)
1565 {
1566 vc->vc_saved_x = vc->vc_x;
1567 vc->vc_saved_y = vc->vc_y;
1568 vc->vc_s_intensity = vc->vc_intensity;
1569 vc->vc_s_italic = vc->vc_italic;
1570 vc->vc_s_underline = vc->vc_underline;
1571 vc->vc_s_blink = vc->vc_blink;
1572 vc->vc_s_reverse = vc->vc_reverse;
1573 vc->vc_s_charset = vc->vc_charset;
1574 vc->vc_s_color = vc->vc_color;
1575 vc->vc_saved_G0 = vc->vc_G0_charset;
1576 vc->vc_saved_G1 = vc->vc_G1_charset;
1577 }
1578
1579 /* console_sem is held */
1580 static void restore_cur(struct vc_data *vc)
1581 {
1582 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1583 vc->vc_intensity = vc->vc_s_intensity;
1584 vc->vc_italic = vc->vc_s_italic;
1585 vc->vc_underline = vc->vc_s_underline;
1586 vc->vc_blink = vc->vc_s_blink;
1587 vc->vc_reverse = vc->vc_s_reverse;
1588 vc->vc_charset = vc->vc_s_charset;
1589 vc->vc_color = vc->vc_s_color;
1590 vc->vc_G0_charset = vc->vc_saved_G0;
1591 vc->vc_G1_charset = vc->vc_saved_G1;
1592 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1593 update_attr(vc);
1594 vc->vc_need_wrap = 0;
1595 }
1596
1597 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1598 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1599 ESpalette };
1600
1601 /* console_sem is held (except via vc_init()) */
1602 static void reset_terminal(struct vc_data *vc, int do_clear)
1603 {
1604 vc->vc_top = 0;
1605 vc->vc_bottom = vc->vc_rows;
1606 vc->vc_state = ESnormal;
1607 vc->vc_ques = 0;
1608 vc->vc_translate = set_translate(LAT1_MAP, vc);
1609 vc->vc_G0_charset = LAT1_MAP;
1610 vc->vc_G1_charset = GRAF_MAP;
1611 vc->vc_charset = 0;
1612 vc->vc_need_wrap = 0;
1613 vc->vc_report_mouse = 0;
1614 vc->vc_utf = default_utf8;
1615 vc->vc_utf_count = 0;
1616
1617 vc->vc_disp_ctrl = 0;
1618 vc->vc_toggle_meta = 0;
1619
1620 vc->vc_decscnm = 0;
1621 vc->vc_decom = 0;
1622 vc->vc_decawm = 1;
1623 vc->vc_deccm = 1;
1624 vc->vc_decim = 0;
1625
1626 set_kbd(vc, decarm);
1627 clr_kbd(vc, decckm);
1628 clr_kbd(vc, kbdapplic);
1629 clr_kbd(vc, lnm);
1630 kbd_table[vc->vc_num].lockstate = 0;
1631 kbd_table[vc->vc_num].slockstate = 0;
1632 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1633 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1634 /* do not do set_leds here because this causes an endless tasklet loop
1635 when the keyboard hasn't been initialized yet */
1636
1637 vc->vc_cursor_type = CUR_DEFAULT;
1638 vc->vc_complement_mask = vc->vc_s_complement_mask;
1639
1640 default_attr(vc);
1641 update_attr(vc);
1642
1643 vc->vc_tab_stop[0] = 0x01010100;
1644 vc->vc_tab_stop[1] =
1645 vc->vc_tab_stop[2] =
1646 vc->vc_tab_stop[3] =
1647 vc->vc_tab_stop[4] =
1648 vc->vc_tab_stop[5] =
1649 vc->vc_tab_stop[6] =
1650 vc->vc_tab_stop[7] = 0x01010101;
1651
1652 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1653 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1654
1655 gotoxy(vc, 0, 0);
1656 save_cur(vc);
1657 if (do_clear)
1658 csi_J(vc, 2);
1659 }
1660
1661 /* console_sem is held */
1662 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1663 {
1664 /*
1665 * Control characters can be used in the _middle_
1666 * of an escape sequence.
1667 */
1668 switch (c) {
1669 case 0:
1670 return;
1671 case 7:
1672 if (vc->vc_bell_duration)
1673 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1674 return;
1675 case 8:
1676 bs(vc);
1677 return;
1678 case 9:
1679 vc->vc_pos -= (vc->vc_x << 1);
1680 while (vc->vc_x < vc->vc_cols - 1) {
1681 vc->vc_x++;
1682 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1683 break;
1684 }
1685 vc->vc_pos += (vc->vc_x << 1);
1686 notify_write(vc, '\t');
1687 return;
1688 case 10: case 11: case 12:
1689 lf(vc);
1690 if (!is_kbd(vc, lnm))
1691 return;
1692 case 13:
1693 cr(vc);
1694 return;
1695 case 14:
1696 vc->vc_charset = 1;
1697 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1698 vc->vc_disp_ctrl = 1;
1699 return;
1700 case 15:
1701 vc->vc_charset = 0;
1702 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1703 vc->vc_disp_ctrl = 0;
1704 return;
1705 case 24: case 26:
1706 vc->vc_state = ESnormal;
1707 return;
1708 case 27:
1709 vc->vc_state = ESesc;
1710 return;
1711 case 127:
1712 del(vc);
1713 return;
1714 case 128+27:
1715 vc->vc_state = ESsquare;
1716 return;
1717 }
1718 switch(vc->vc_state) {
1719 case ESesc:
1720 vc->vc_state = ESnormal;
1721 switch (c) {
1722 case '[':
1723 vc->vc_state = ESsquare;
1724 return;
1725 case ']':
1726 vc->vc_state = ESnonstd;
1727 return;
1728 case '%':
1729 vc->vc_state = ESpercent;
1730 return;
1731 case 'E':
1732 cr(vc);
1733 lf(vc);
1734 return;
1735 case 'M':
1736 ri(vc);
1737 return;
1738 case 'D':
1739 lf(vc);
1740 return;
1741 case 'H':
1742 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1743 return;
1744 case 'Z':
1745 respond_ID(tty);
1746 return;
1747 case '7':
1748 save_cur(vc);
1749 return;
1750 case '8':
1751 restore_cur(vc);
1752 return;
1753 case '(':
1754 vc->vc_state = ESsetG0;
1755 return;
1756 case ')':
1757 vc->vc_state = ESsetG1;
1758 return;
1759 case '#':
1760 vc->vc_state = EShash;
1761 return;
1762 case 'c':
1763 reset_terminal(vc, 1);
1764 return;
1765 case '>': /* Numeric keypad */
1766 clr_kbd(vc, kbdapplic);
1767 return;
1768 case '=': /* Appl. keypad */
1769 set_kbd(vc, kbdapplic);
1770 return;
1771 }
1772 return;
1773 case ESnonstd:
1774 if (c=='P') { /* palette escape sequence */
1775 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1776 vc->vc_par[vc->vc_npar] = 0;
1777 vc->vc_npar = 0;
1778 vc->vc_state = ESpalette;
1779 return;
1780 } else if (c=='R') { /* reset palette */
1781 reset_palette(vc);
1782 vc->vc_state = ESnormal;
1783 } else
1784 vc->vc_state = ESnormal;
1785 return;
1786 case ESpalette:
1787 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1788 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1789 if (vc->vc_npar == 7) {
1790 int i = vc->vc_par[0] * 3, j = 1;
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 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1796 vc->vc_palette[i] += vc->vc_par[j];
1797 set_palette(vc);
1798 vc->vc_state = ESnormal;
1799 }
1800 } else
1801 vc->vc_state = ESnormal;
1802 return;
1803 case ESsquare:
1804 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1805 vc->vc_par[vc->vc_npar] = 0;
1806 vc->vc_npar = 0;
1807 vc->vc_state = ESgetpars;
1808 if (c == '[') { /* Function key */
1809 vc->vc_state=ESfunckey;
1810 return;
1811 }
1812 vc->vc_ques = (c == '?');
1813 if (vc->vc_ques)
1814 return;
1815 case ESgetpars:
1816 if (c == ';' && vc->vc_npar < NPAR - 1) {
1817 vc->vc_npar++;
1818 return;
1819 } else if (c>='0' && c<='9') {
1820 vc->vc_par[vc->vc_npar] *= 10;
1821 vc->vc_par[vc->vc_npar] += c - '0';
1822 return;
1823 } else
1824 vc->vc_state = ESgotpars;
1825 case ESgotpars:
1826 vc->vc_state = ESnormal;
1827 switch(c) {
1828 case 'h':
1829 set_mode(vc, 1);
1830 return;
1831 case 'l':
1832 set_mode(vc, 0);
1833 return;
1834 case 'c':
1835 if (vc->vc_ques) {
1836 if (vc->vc_par[0])
1837 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1838 else
1839 vc->vc_cursor_type = CUR_DEFAULT;
1840 return;
1841 }
1842 break;
1843 case 'm':
1844 if (vc->vc_ques) {
1845 clear_selection();
1846 if (vc->vc_par[0])
1847 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1848 else
1849 vc->vc_complement_mask = vc->vc_s_complement_mask;
1850 return;
1851 }
1852 break;
1853 case 'n':
1854 if (!vc->vc_ques) {
1855 if (vc->vc_par[0] == 5)
1856 status_report(tty);
1857 else if (vc->vc_par[0] == 6)
1858 cursor_report(vc, tty);
1859 }
1860 return;
1861 }
1862 if (vc->vc_ques) {
1863 vc->vc_ques = 0;
1864 return;
1865 }
1866 switch(c) {
1867 case 'G': case '`':
1868 if (vc->vc_par[0])
1869 vc->vc_par[0]--;
1870 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1871 return;
1872 case 'A':
1873 if (!vc->vc_par[0])
1874 vc->vc_par[0]++;
1875 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1876 return;
1877 case 'B': case 'e':
1878 if (!vc->vc_par[0])
1879 vc->vc_par[0]++;
1880 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1881 return;
1882 case 'C': case 'a':
1883 if (!vc->vc_par[0])
1884 vc->vc_par[0]++;
1885 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1886 return;
1887 case 'D':
1888 if (!vc->vc_par[0])
1889 vc->vc_par[0]++;
1890 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1891 return;
1892 case 'E':
1893 if (!vc->vc_par[0])
1894 vc->vc_par[0]++;
1895 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1896 return;
1897 case 'F':
1898 if (!vc->vc_par[0])
1899 vc->vc_par[0]++;
1900 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1901 return;
1902 case 'd':
1903 if (vc->vc_par[0])
1904 vc->vc_par[0]--;
1905 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1906 return;
1907 case 'H': case 'f':
1908 if (vc->vc_par[0])
1909 vc->vc_par[0]--;
1910 if (vc->vc_par[1])
1911 vc->vc_par[1]--;
1912 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1913 return;
1914 case 'J':
1915 csi_J(vc, vc->vc_par[0]);
1916 return;
1917 case 'K':
1918 csi_K(vc, vc->vc_par[0]);
1919 return;
1920 case 'L':
1921 csi_L(vc, vc->vc_par[0]);
1922 return;
1923 case 'M':
1924 csi_M(vc, vc->vc_par[0]);
1925 return;
1926 case 'P':
1927 csi_P(vc, vc->vc_par[0]);
1928 return;
1929 case 'c':
1930 if (!vc->vc_par[0])
1931 respond_ID(tty);
1932 return;
1933 case 'g':
1934 if (!vc->vc_par[0])
1935 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1936 else if (vc->vc_par[0] == 3) {
1937 vc->vc_tab_stop[0] =
1938 vc->vc_tab_stop[1] =
1939 vc->vc_tab_stop[2] =
1940 vc->vc_tab_stop[3] =
1941 vc->vc_tab_stop[4] =
1942 vc->vc_tab_stop[5] =
1943 vc->vc_tab_stop[6] =
1944 vc->vc_tab_stop[7] = 0;
1945 }
1946 return;
1947 case 'm':
1948 csi_m(vc);
1949 return;
1950 case 'q': /* DECLL - but only 3 leds */
1951 /* map 0,1,2,3 to 0,1,2,4 */
1952 if (vc->vc_par[0] < 4)
1953 setledstate(kbd_table + vc->vc_num,
1954 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1955 return;
1956 case 'r':
1957 if (!vc->vc_par[0])
1958 vc->vc_par[0]++;
1959 if (!vc->vc_par[1])
1960 vc->vc_par[1] = vc->vc_rows;
1961 /* Minimum allowed region is 2 lines */
1962 if (vc->vc_par[0] < vc->vc_par[1] &&
1963 vc->vc_par[1] <= vc->vc_rows) {
1964 vc->vc_top = vc->vc_par[0] - 1;
1965 vc->vc_bottom = vc->vc_par[1];
1966 gotoxay(vc, 0, 0);
1967 }
1968 return;
1969 case 's':
1970 save_cur(vc);
1971 return;
1972 case 'u':
1973 restore_cur(vc);
1974 return;
1975 case 'X':
1976 csi_X(vc, vc->vc_par[0]);
1977 return;
1978 case '@':
1979 csi_at(vc, vc->vc_par[0]);
1980 return;
1981 case ']': /* setterm functions */
1982 setterm_command(vc);
1983 return;
1984 }
1985 return;
1986 case ESpercent:
1987 vc->vc_state = ESnormal;
1988 switch (c) {
1989 case '@': /* defined in ISO 2022 */
1990 vc->vc_utf = 0;
1991 return;
1992 case 'G': /* prelim official escape code */
1993 case '8': /* retained for compatibility */
1994 vc->vc_utf = 1;
1995 return;
1996 }
1997 return;
1998 case ESfunckey:
1999 vc->vc_state = ESnormal;
2000 return;
2001 case EShash:
2002 vc->vc_state = ESnormal;
2003 if (c == '8') {
2004 /* DEC screen alignment test. kludge :-) */
2005 vc->vc_video_erase_char =
2006 (vc->vc_video_erase_char & 0xff00) | 'E';
2007 csi_J(vc, 2);
2008 vc->vc_video_erase_char =
2009 (vc->vc_video_erase_char & 0xff00) | ' ';
2010 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2011 }
2012 return;
2013 case ESsetG0:
2014 if (c == '0')
2015 vc->vc_G0_charset = GRAF_MAP;
2016 else if (c == 'B')
2017 vc->vc_G0_charset = LAT1_MAP;
2018 else if (c == 'U')
2019 vc->vc_G0_charset = IBMPC_MAP;
2020 else if (c == 'K')
2021 vc->vc_G0_charset = USER_MAP;
2022 if (vc->vc_charset == 0)
2023 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2024 vc->vc_state = ESnormal;
2025 return;
2026 case ESsetG1:
2027 if (c == '0')
2028 vc->vc_G1_charset = GRAF_MAP;
2029 else if (c == 'B')
2030 vc->vc_G1_charset = LAT1_MAP;
2031 else if (c == 'U')
2032 vc->vc_G1_charset = IBMPC_MAP;
2033 else if (c == 'K')
2034 vc->vc_G1_charset = USER_MAP;
2035 if (vc->vc_charset == 1)
2036 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2037 vc->vc_state = ESnormal;
2038 return;
2039 default:
2040 vc->vc_state = ESnormal;
2041 }
2042 }
2043
2044 /* This is a temporary buffer used to prepare a tty console write
2045 * so that we can easily avoid touching user space while holding the
2046 * console spinlock. It is allocated in con_init and is shared by
2047 * this code and the vc_screen read/write tty calls.
2048 *
2049 * We have to allocate this statically in the kernel data section
2050 * since console_init (and thus con_init) are called before any
2051 * kernel memory allocation is available.
2052 */
2053 char con_buf[CON_BUF_SIZE];
2054 DEFINE_MUTEX(con_buf_mtx);
2055
2056 /* is_double_width() is based on the wcwidth() implementation by
2057 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2058 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2059 */
2060 struct interval {
2061 uint32_t first;
2062 uint32_t last;
2063 };
2064
2065 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2066 {
2067 int min = 0;
2068 int mid;
2069
2070 if (ucs < table[0].first || ucs > table[max].last)
2071 return 0;
2072 while (max >= min) {
2073 mid = (min + max) / 2;
2074 if (ucs > table[mid].last)
2075 min = mid + 1;
2076 else if (ucs < table[mid].first)
2077 max = mid - 1;
2078 else
2079 return 1;
2080 }
2081 return 0;
2082 }
2083
2084 static int is_double_width(uint32_t ucs)
2085 {
2086 static const struct interval double_width[] = {
2087 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2088 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2089 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2090 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2091 };
2092 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2093 }
2094
2095 /* acquires console_sem */
2096 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2097 {
2098 #ifdef VT_BUF_VRAM_ONLY
2099 #define FLUSH do { } while(0);
2100 #else
2101 #define FLUSH if (draw_x >= 0) { \
2102 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2103 draw_x = -1; \
2104 }
2105 #endif
2106
2107 int c, tc, ok, n = 0, draw_x = -1;
2108 unsigned int currcons;
2109 unsigned long draw_from = 0, draw_to = 0;
2110 struct vc_data *vc;
2111 unsigned char vc_attr;
2112 struct vt_notifier_param param;
2113 uint8_t rescan;
2114 uint8_t inverse;
2115 uint8_t width;
2116 u16 himask, charmask;
2117 const unsigned char *orig_buf = NULL;
2118 int orig_count;
2119
2120 if (in_interrupt())
2121 return count;
2122
2123 might_sleep();
2124
2125 acquire_console_sem();
2126 vc = tty->driver_data;
2127 if (vc == NULL) {
2128 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2129 release_console_sem();
2130 return 0;
2131 }
2132
2133 currcons = vc->vc_num;
2134 if (!vc_cons_allocated(currcons)) {
2135 /* could this happen? */
2136 static int error = 0;
2137 if (!error) {
2138 error = 1;
2139 printk("con_write: tty %d not allocated\n", currcons+1);
2140 }
2141 release_console_sem();
2142 return 0;
2143 }
2144 orig_buf = buf;
2145 orig_count = count;
2146
2147 himask = vc->vc_hi_font_mask;
2148 charmask = himask ? 0x1ff : 0xff;
2149
2150 /* undraw cursor first */
2151 if (IS_FG(vc))
2152 hide_cursor(vc);
2153
2154 param.vc = vc;
2155
2156 while (!tty->stopped && count) {
2157 int orig = *buf;
2158 c = orig;
2159 buf++;
2160 n++;
2161 count--;
2162 rescan = 0;
2163 inverse = 0;
2164 width = 1;
2165
2166 /* Do no translation at all in control states */
2167 if (vc->vc_state != ESnormal) {
2168 tc = c;
2169 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2170 /* Combine UTF-8 into Unicode in vc_utf_char.
2171 * vc_utf_count is the number of continuation bytes still
2172 * expected to arrive.
2173 * vc_npar is the number of continuation bytes arrived so
2174 * far
2175 */
2176 rescan_last_byte:
2177 if ((c & 0xc0) == 0x80) {
2178 /* Continuation byte received */
2179 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2180 if (vc->vc_utf_count) {
2181 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2182 vc->vc_npar++;
2183 if (--vc->vc_utf_count) {
2184 /* Still need some bytes */
2185 continue;
2186 }
2187 /* Got a whole character */
2188 c = vc->vc_utf_char;
2189 /* Reject overlong sequences */
2190 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2191 c > utf8_length_changes[vc->vc_npar])
2192 c = 0xfffd;
2193 } else {
2194 /* Unexpected continuation byte */
2195 vc->vc_utf_count = 0;
2196 c = 0xfffd;
2197 }
2198 } else {
2199 /* Single ASCII byte or first byte of a sequence received */
2200 if (vc->vc_utf_count) {
2201 /* Continuation byte expected */
2202 rescan = 1;
2203 vc->vc_utf_count = 0;
2204 c = 0xfffd;
2205 } else if (c > 0x7f) {
2206 /* First byte of a multibyte sequence received */
2207 vc->vc_npar = 0;
2208 if ((c & 0xe0) == 0xc0) {
2209 vc->vc_utf_count = 1;
2210 vc->vc_utf_char = (c & 0x1f);
2211 } else if ((c & 0xf0) == 0xe0) {
2212 vc->vc_utf_count = 2;
2213 vc->vc_utf_char = (c & 0x0f);
2214 } else if ((c & 0xf8) == 0xf0) {
2215 vc->vc_utf_count = 3;
2216 vc->vc_utf_char = (c & 0x07);
2217 } else if ((c & 0xfc) == 0xf8) {
2218 vc->vc_utf_count = 4;
2219 vc->vc_utf_char = (c & 0x03);
2220 } else if ((c & 0xfe) == 0xfc) {
2221 vc->vc_utf_count = 5;
2222 vc->vc_utf_char = (c & 0x01);
2223 } else {
2224 /* 254 and 255 are invalid */
2225 c = 0xfffd;
2226 }
2227 if (vc->vc_utf_count) {
2228 /* Still need some bytes */
2229 continue;
2230 }
2231 }
2232 /* Nothing to do if an ASCII byte was received */
2233 }
2234 /* End of UTF-8 decoding. */
2235 /* c is the received character, or U+FFFD for invalid sequences. */
2236 /* Replace invalid Unicode code points with U+FFFD too */
2237 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2238 c = 0xfffd;
2239 tc = c;
2240 } else { /* no utf or alternate charset mode */
2241 tc = vc_translate(vc, c);
2242 }
2243
2244 param.c = tc;
2245 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2246 &param) == NOTIFY_STOP)
2247 continue;
2248
2249 /* If the original code was a control character we
2250 * only allow a glyph to be displayed if the code is
2251 * not normally used (such as for cursor movement) or
2252 * if the disp_ctrl mode has been explicitly enabled.
2253 * Certain characters (as given by the CTRL_ALWAYS
2254 * bitmap) are always displayed as control characters,
2255 * as the console would be pretty useless without
2256 * them; to display an arbitrary font position use the
2257 * direct-to-font zone in UTF-8 mode.
2258 */
2259 ok = tc && (c >= 32 ||
2260 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2261 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2262 && (c != 127 || vc->vc_disp_ctrl)
2263 && (c != 128+27);
2264
2265 if (vc->vc_state == ESnormal && ok) {
2266 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2267 if (is_double_width(c))
2268 width = 2;
2269 }
2270 /* Now try to find out how to display it */
2271 tc = conv_uni_to_pc(vc, tc);
2272 if (tc & ~charmask) {
2273 if (tc == -1 || tc == -2) {
2274 continue; /* nothing to display */
2275 }
2276 /* Glyph not found */
2277 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) && c < 128) && !(c & ~charmask)) {
2278 /* In legacy mode use the glyph we get by a 1:1 mapping.
2279 This would make absolutely no sense with Unicode in mind,
2280 but do this for ASCII characters since a font may lack
2281 Unicode mapping info and we don't want to end up with
2282 having question marks only. */
2283 tc = c;
2284 } else {
2285 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2286 tc = conv_uni_to_pc(vc, 0xfffd);
2287 if (tc < 0) {
2288 inverse = 1;
2289 tc = conv_uni_to_pc(vc, '?');
2290 if (tc < 0) tc = '?';
2291 }
2292 }
2293 }
2294
2295 if (!inverse) {
2296 vc_attr = vc->vc_attr;
2297 } else {
2298 /* invert vc_attr */
2299 if (!vc->vc_can_do_color) {
2300 vc_attr = (vc->vc_attr) ^ 0x08;
2301 } else if (vc->vc_hi_font_mask == 0x100) {
2302 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2303 } else {
2304 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2305 }
2306 FLUSH
2307 }
2308
2309 while (1) {
2310 if (vc->vc_need_wrap || vc->vc_decim)
2311 FLUSH
2312 if (vc->vc_need_wrap) {
2313 cr(vc);
2314 lf(vc);
2315 }
2316 if (vc->vc_decim)
2317 insert_char(vc, 1);
2318 scr_writew(himask ?
2319 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2320 (vc_attr << 8) + tc,
2321 (u16 *) vc->vc_pos);
2322 if (DO_UPDATE(vc) && draw_x < 0) {
2323 draw_x = vc->vc_x;
2324 draw_from = vc->vc_pos;
2325 }
2326 if (vc->vc_x == vc->vc_cols - 1) {
2327 vc->vc_need_wrap = vc->vc_decawm;
2328 draw_to = vc->vc_pos + 2;
2329 } else {
2330 vc->vc_x++;
2331 draw_to = (vc->vc_pos += 2);
2332 }
2333
2334 if (!--width) break;
2335
2336 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2337 if (tc < 0) tc = ' ';
2338 }
2339 notify_write(vc, c);
2340
2341 if (inverse) {
2342 FLUSH
2343 }
2344
2345 if (rescan) {
2346 rescan = 0;
2347 inverse = 0;
2348 width = 1;
2349 c = orig;
2350 goto rescan_last_byte;
2351 }
2352 continue;
2353 }
2354 FLUSH
2355 do_con_trol(tty, vc, orig);
2356 }
2357 FLUSH
2358 console_conditional_schedule();
2359 release_console_sem();
2360 notify_update(vc);
2361 return n;
2362 #undef FLUSH
2363 }
2364
2365 /*
2366 * This is the console switching callback.
2367 *
2368 * Doing console switching in a process context allows
2369 * us to do the switches asynchronously (needed when we want
2370 * to switch due to a keyboard interrupt). Synchronization
2371 * with other console code and prevention of re-entrancy is
2372 * ensured with console_sem.
2373 */
2374 static void console_callback(struct work_struct *ignored)
2375 {
2376 acquire_console_sem();
2377
2378 if (want_console >= 0) {
2379 if (want_console != fg_console &&
2380 vc_cons_allocated(want_console)) {
2381 hide_cursor(vc_cons[fg_console].d);
2382 change_console(vc_cons[want_console].d);
2383 /* we only changed when the console had already
2384 been allocated - a new console is not created
2385 in an interrupt routine */
2386 }
2387 want_console = -1;
2388 }
2389 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2390 do_poke_blanked_console = 0;
2391 poke_blanked_console();
2392 }
2393 if (scrollback_delta) {
2394 struct vc_data *vc = vc_cons[fg_console].d;
2395 clear_selection();
2396 if (vc->vc_mode == KD_TEXT)
2397 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2398 scrollback_delta = 0;
2399 }
2400 if (blank_timer_expired) {
2401 do_blank_screen(0);
2402 blank_timer_expired = 0;
2403 }
2404 notify_update(vc_cons[fg_console].d);
2405
2406 release_console_sem();
2407 }
2408
2409 int set_console(int nr)
2410 {
2411 struct vc_data *vc = vc_cons[fg_console].d;
2412
2413 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2414 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2415
2416 /*
2417 * Console switch will fail in console_callback() or
2418 * change_console() so there is no point scheduling
2419 * the callback
2420 *
2421 * Existing set_console() users don't check the return
2422 * value so this shouldn't break anything
2423 */
2424 return -EINVAL;
2425 }
2426
2427 want_console = nr;
2428 schedule_console_callback();
2429
2430 return 0;
2431 }
2432
2433 struct tty_driver *console_driver;
2434
2435 #ifdef CONFIG_VT_CONSOLE
2436
2437 /*
2438 * Console on virtual terminal
2439 *
2440 * The console must be locked when we get here.
2441 */
2442
2443 static void vt_console_print(struct console *co, const char *b, unsigned count)
2444 {
2445 struct vc_data *vc = vc_cons[fg_console].d;
2446 unsigned char c;
2447 static DEFINE_SPINLOCK(printing_lock);
2448 const ushort *start;
2449 ushort cnt = 0;
2450 ushort myx;
2451
2452 /* console busy or not yet initialized */
2453 if (!printable)
2454 return;
2455 if (!spin_trylock(&printing_lock))
2456 return;
2457
2458 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2459 vc = vc_cons[kmsg_redirect - 1].d;
2460
2461 /* read `x' only after setting currcons properly (otherwise
2462 the `x' macro will read the x of the foreground console). */
2463 myx = vc->vc_x;
2464
2465 if (!vc_cons_allocated(fg_console)) {
2466 /* impossible */
2467 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2468 goto quit;
2469 }
2470
2471 if (vc->vc_mode != KD_TEXT)
2472 goto quit;
2473
2474 /* undraw cursor first */
2475 if (IS_FG(vc))
2476 hide_cursor(vc);
2477
2478 start = (ushort *)vc->vc_pos;
2479
2480 /* Contrived structure to try to emulate original need_wrap behaviour
2481 * Problems caused when we have need_wrap set on '\n' character */
2482 while (count--) {
2483 c = *b++;
2484 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2485 if (cnt > 0) {
2486 if (CON_IS_VISIBLE(vc))
2487 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2488 vc->vc_x += cnt;
2489 if (vc->vc_need_wrap)
2490 vc->vc_x--;
2491 cnt = 0;
2492 }
2493 if (c == 8) { /* backspace */
2494 bs(vc);
2495 start = (ushort *)vc->vc_pos;
2496 myx = vc->vc_x;
2497 continue;
2498 }
2499 if (c != 13)
2500 lf(vc);
2501 cr(vc);
2502 start = (ushort *)vc->vc_pos;
2503 myx = vc->vc_x;
2504 if (c == 10 || c == 13)
2505 continue;
2506 }
2507 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2508 notify_write(vc, c);
2509 cnt++;
2510 if (myx == vc->vc_cols - 1) {
2511 vc->vc_need_wrap = 1;
2512 continue;
2513 }
2514 vc->vc_pos += 2;
2515 myx++;
2516 }
2517 if (cnt > 0) {
2518 if (CON_IS_VISIBLE(vc))
2519 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2520 vc->vc_x += cnt;
2521 if (vc->vc_x == vc->vc_cols) {
2522 vc->vc_x--;
2523 vc->vc_need_wrap = 1;
2524 }
2525 }
2526 set_cursor(vc);
2527 notify_update(vc);
2528
2529 quit:
2530 spin_unlock(&printing_lock);
2531 }
2532
2533 static struct tty_driver *vt_console_device(struct console *c, int *index)
2534 {
2535 *index = c->index ? c->index-1 : fg_console;
2536 return console_driver;
2537 }
2538
2539 static struct console vt_console_driver = {
2540 .name = "tty",
2541 .write = vt_console_print,
2542 .device = vt_console_device,
2543 .unblank = unblank_screen,
2544 .flags = CON_PRINTBUFFER,
2545 .index = -1,
2546 };
2547 #endif
2548
2549 /*
2550 * Handling of Linux-specific VC ioctls
2551 */
2552
2553 /*
2554 * Generally a bit racy with respect to console_sem().
2555 *
2556 * There are some functions which don't need it.
2557 *
2558 * There are some functions which can sleep for arbitrary periods
2559 * (paste_selection) but we don't need the lock there anyway.
2560 *
2561 * set_selection has locking, and definitely needs it
2562 */
2563
2564 int tioclinux(struct tty_struct *tty, unsigned long arg)
2565 {
2566 char type, data;
2567 char __user *p = (char __user *)arg;
2568 int lines;
2569 int ret;
2570
2571 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2572 return -EPERM;
2573 if (get_user(type, p))
2574 return -EFAULT;
2575 ret = 0;
2576
2577 lock_kernel();
2578
2579 switch (type)
2580 {
2581 case TIOCL_SETSEL:
2582 acquire_console_sem();
2583 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2584 release_console_sem();
2585 break;
2586 case TIOCL_PASTESEL:
2587 ret = paste_selection(tty);
2588 break;
2589 case TIOCL_UNBLANKSCREEN:
2590 acquire_console_sem();
2591 unblank_screen();
2592 release_console_sem();
2593 break;
2594 case TIOCL_SELLOADLUT:
2595 ret = sel_loadlut(p);
2596 break;
2597 case TIOCL_GETSHIFTSTATE:
2598
2599 /*
2600 * Make it possible to react to Shift+Mousebutton.
2601 * Note that 'shift_state' is an undocumented
2602 * kernel-internal variable; programs not closely
2603 * related to the kernel should not use this.
2604 */
2605 data = shift_state;
2606 ret = __put_user(data, p);
2607 break;
2608 case TIOCL_GETMOUSEREPORTING:
2609 data = mouse_reporting();
2610 ret = __put_user(data, p);
2611 break;
2612 case TIOCL_SETVESABLANK:
2613 ret = set_vesa_blanking(p);
2614 break;
2615 case TIOCL_GETKMSGREDIRECT:
2616 data = kmsg_redirect;
2617 ret = __put_user(data, p);
2618 break;
2619 case TIOCL_SETKMSGREDIRECT:
2620 if (!capable(CAP_SYS_ADMIN)) {
2621 ret = -EPERM;
2622 } else {
2623 if (get_user(data, p+1))
2624 ret = -EFAULT;
2625 else
2626 kmsg_redirect = data;
2627 }
2628 break;
2629 case TIOCL_GETFGCONSOLE:
2630 ret = fg_console;
2631 break;
2632 case TIOCL_SCROLLCONSOLE:
2633 if (get_user(lines, (s32 __user *)(p+4))) {
2634 ret = -EFAULT;
2635 } else {
2636 scrollfront(vc_cons[fg_console].d, lines);
2637 ret = 0;
2638 }
2639 break;
2640 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2641 acquire_console_sem();
2642 ignore_poke = 1;
2643 do_blank_screen(0);
2644 release_console_sem();
2645 break;
2646 case TIOCL_BLANKEDSCREEN:
2647 ret = console_blanked;
2648 break;
2649 default:
2650 ret = -EINVAL;
2651 break;
2652 }
2653 unlock_kernel();
2654 return ret;
2655 }
2656
2657 /*
2658 * /dev/ttyN handling
2659 */
2660
2661 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2662 {
2663 int retval;
2664
2665 retval = do_con_write(tty, buf, count);
2666 con_flush_chars(tty);
2667
2668 return retval;
2669 }
2670
2671 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2672 {
2673 if (in_interrupt())
2674 return 0; /* n_r3964 calls put_char() from interrupt context */
2675 return do_con_write(tty, &ch, 1);
2676 }
2677
2678 static int con_write_room(struct tty_struct *tty)
2679 {
2680 if (tty->stopped)
2681 return 0;
2682 return 4096; /* No limit, really; we're not buffering */
2683 }
2684
2685 static int con_chars_in_buffer(struct tty_struct *tty)
2686 {
2687 return 0; /* we're not buffering */
2688 }
2689
2690 /*
2691 * con_throttle and con_unthrottle are only used for
2692 * paste_selection(), which has to stuff in a large number of
2693 * characters...
2694 */
2695 static void con_throttle(struct tty_struct *tty)
2696 {
2697 }
2698
2699 static void con_unthrottle(struct tty_struct *tty)
2700 {
2701 struct vc_data *vc = tty->driver_data;
2702
2703 wake_up_interruptible(&vc->paste_wait);
2704 }
2705
2706 /*
2707 * Turn the Scroll-Lock LED on when the tty is stopped
2708 */
2709 static void con_stop(struct tty_struct *tty)
2710 {
2711 int console_num;
2712 if (!tty)
2713 return;
2714 console_num = tty->index;
2715 if (!vc_cons_allocated(console_num))
2716 return;
2717 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2718 set_leds();
2719 }
2720
2721 /*
2722 * Turn the Scroll-Lock LED off when the console is started
2723 */
2724 static void con_start(struct tty_struct *tty)
2725 {
2726 int console_num;
2727 if (!tty)
2728 return;
2729 console_num = tty->index;
2730 if (!vc_cons_allocated(console_num))
2731 return;
2732 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2733 set_leds();
2734 }
2735
2736 static void con_flush_chars(struct tty_struct *tty)
2737 {
2738 struct vc_data *vc;
2739
2740 if (in_interrupt()) /* from flush_to_ldisc */
2741 return;
2742
2743 /* if we race with con_close(), vt may be null */
2744 acquire_console_sem();
2745 vc = tty->driver_data;
2746 if (vc)
2747 set_cursor(vc);
2748 release_console_sem();
2749 }
2750
2751 /*
2752 * Allocate the console screen memory.
2753 */
2754 static int con_open(struct tty_struct *tty, struct file *filp)
2755 {
2756 unsigned int currcons = tty->index;
2757 int ret = 0;
2758
2759 acquire_console_sem();
2760 if (tty->driver_data == NULL) {
2761 ret = vc_allocate(currcons);
2762 if (ret == 0) {
2763 struct vc_data *vc = vc_cons[currcons].d;
2764
2765 /* Still being freed */
2766 if (vc->vc_tty) {
2767 release_console_sem();
2768 return -ERESTARTSYS;
2769 }
2770 tty->driver_data = vc;
2771 vc->vc_tty = tty;
2772
2773 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2774 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2775 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2776 }
2777 if (vc->vc_utf)
2778 tty->termios->c_iflag |= IUTF8;
2779 else
2780 tty->termios->c_iflag &= ~IUTF8;
2781 vcs_make_sysfs(tty);
2782 release_console_sem();
2783 return ret;
2784 }
2785 }
2786 release_console_sem();
2787 return ret;
2788 }
2789
2790 static void con_close(struct tty_struct *tty, struct file *filp)
2791 {
2792 /* Nothing to do - we defer to shutdown */
2793 }
2794
2795 static void con_shutdown(struct tty_struct *tty)
2796 {
2797 struct vc_data *vc = tty->driver_data;
2798 BUG_ON(vc == NULL);
2799 acquire_console_sem();
2800 vc->vc_tty = NULL;
2801 vcs_remove_sysfs(tty);
2802 release_console_sem();
2803 tty_shutdown(tty);
2804 }
2805
2806 static int default_italic_color = 2; // green (ASCII)
2807 static int default_underline_color = 3; // cyan (ASCII)
2808 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2809 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2810
2811 static void vc_init(struct vc_data *vc, unsigned int rows,
2812 unsigned int cols, int do_clear)
2813 {
2814 int j, k ;
2815
2816 vc->vc_cols = cols;
2817 vc->vc_rows = rows;
2818 vc->vc_size_row = cols << 1;
2819 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2820
2821 set_origin(vc);
2822 vc->vc_pos = vc->vc_origin;
2823 reset_vc(vc);
2824 for (j=k=0; j<16; j++) {
2825 vc->vc_palette[k++] = default_red[j] ;
2826 vc->vc_palette[k++] = default_grn[j] ;
2827 vc->vc_palette[k++] = default_blu[j] ;
2828 }
2829 vc->vc_def_color = 0x07; /* white */
2830 vc->vc_ulcolor = default_underline_color;
2831 vc->vc_itcolor = default_italic_color;
2832 vc->vc_halfcolor = 0x08; /* grey */
2833 init_waitqueue_head(&vc->paste_wait);
2834 reset_terminal(vc, do_clear);
2835 }
2836
2837 /*
2838 * This routine initializes console interrupts, and does nothing
2839 * else. If you want the screen to clear, call tty_write with
2840 * the appropriate escape-sequence.
2841 */
2842
2843 static int __init con_init(void)
2844 {
2845 const char *display_desc = NULL;
2846 struct vc_data *vc;
2847 unsigned int currcons = 0, i;
2848
2849 acquire_console_sem();
2850
2851 if (conswitchp)
2852 display_desc = conswitchp->con_startup();
2853 if (!display_desc) {
2854 fg_console = 0;
2855 release_console_sem();
2856 return 0;
2857 }
2858
2859 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2860 struct con_driver *con_driver = &registered_con_driver[i];
2861
2862 if (con_driver->con == NULL) {
2863 con_driver->con = conswitchp;
2864 con_driver->desc = display_desc;
2865 con_driver->flag = CON_DRIVER_FLAG_INIT;
2866 con_driver->first = 0;
2867 con_driver->last = MAX_NR_CONSOLES - 1;
2868 break;
2869 }
2870 }
2871
2872 for (i = 0; i < MAX_NR_CONSOLES; i++)
2873 con_driver_map[i] = conswitchp;
2874
2875 if (blankinterval) {
2876 blank_state = blank_normal_wait;
2877 mod_timer(&console_timer, jiffies + blankinterval);
2878 }
2879
2880 /*
2881 * kmalloc is not running yet - we use the bootmem allocator.
2882 */
2883 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2884 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2885 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2886 visual_init(vc, currcons, 1);
2887 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2888 vc->vc_kmalloced = 0;
2889 vc_init(vc, vc->vc_rows, vc->vc_cols,
2890 currcons || !vc->vc_sw->con_save_screen);
2891 }
2892 currcons = fg_console = 0;
2893 master_display_fg = vc = vc_cons[currcons].d;
2894 set_origin(vc);
2895 save_screen(vc);
2896 gotoxy(vc, vc->vc_x, vc->vc_y);
2897 csi_J(vc, 0);
2898 update_screen(vc);
2899 printk("Console: %s %s %dx%d",
2900 vc->vc_can_do_color ? "colour" : "mono",
2901 display_desc, vc->vc_cols, vc->vc_rows);
2902 printable = 1;
2903 printk("\n");
2904
2905 release_console_sem();
2906
2907 #ifdef CONFIG_VT_CONSOLE
2908 register_console(&vt_console_driver);
2909 #endif
2910 return 0;
2911 }
2912 console_initcall(con_init);
2913
2914 static const struct tty_operations con_ops = {
2915 .open = con_open,
2916 .close = con_close,
2917 .write = con_write,
2918 .write_room = con_write_room,
2919 .put_char = con_put_char,
2920 .flush_chars = con_flush_chars,
2921 .chars_in_buffer = con_chars_in_buffer,
2922 .ioctl = vt_ioctl,
2923 .stop = con_stop,
2924 .start = con_start,
2925 .throttle = con_throttle,
2926 .unthrottle = con_unthrottle,
2927 .resize = vt_resize,
2928 .shutdown = con_shutdown
2929 };
2930
2931 static struct cdev vc0_cdev;
2932
2933 int __init vty_init(const struct file_operations *console_fops)
2934 {
2935 cdev_init(&vc0_cdev, console_fops);
2936 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2937 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2938 panic("Couldn't register /dev/tty0 driver\n");
2939 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2940
2941 vcs_init();
2942
2943 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2944 if (!console_driver)
2945 panic("Couldn't allocate console driver\n");
2946 console_driver->owner = THIS_MODULE;
2947 console_driver->name = "tty";
2948 console_driver->name_base = 1;
2949 console_driver->major = TTY_MAJOR;
2950 console_driver->minor_start = 1;
2951 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2952 console_driver->init_termios = tty_std_termios;
2953 if (default_utf8)
2954 console_driver->init_termios.c_iflag |= IUTF8;
2955 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2956 tty_set_operations(console_driver, &con_ops);
2957 if (tty_register_driver(console_driver))
2958 panic("Couldn't register console driver\n");
2959 kbd_init();
2960 console_map_init();
2961 #ifdef CONFIG_PROM_CONSOLE
2962 prom_con_init();
2963 #endif
2964 #ifdef CONFIG_MDA_CONSOLE
2965 mda_console_init();
2966 #endif
2967 return 0;
2968 }
2969
2970 #ifndef VT_SINGLE_DRIVER
2971 #include <linux/device.h>
2972
2973 static struct class *vtconsole_class;
2974
2975 static int bind_con_driver(const struct consw *csw, int first, int last,
2976 int deflt)
2977 {
2978 struct module *owner = csw->owner;
2979 const char *desc = NULL;
2980 struct con_driver *con_driver;
2981 int i, j = -1, k = -1, retval = -ENODEV;
2982
2983 if (!try_module_get(owner))
2984 return -ENODEV;
2985
2986 acquire_console_sem();
2987
2988 /* check if driver is registered */
2989 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2990 con_driver = &registered_con_driver[i];
2991
2992 if (con_driver->con == csw) {
2993 desc = con_driver->desc;
2994 retval = 0;
2995 break;
2996 }
2997 }
2998
2999 if (retval)
3000 goto err;
3001
3002 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3003 csw->con_startup();
3004 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3005 }
3006
3007 if (deflt) {
3008 if (conswitchp)
3009 module_put(conswitchp->owner);
3010
3011 __module_get(owner);
3012 conswitchp = csw;
3013 }
3014
3015 first = max(first, con_driver->first);
3016 last = min(last, con_driver->last);
3017
3018 for (i = first; i <= last; i++) {
3019 int old_was_color;
3020 struct vc_data *vc = vc_cons[i].d;
3021
3022 if (con_driver_map[i])
3023 module_put(con_driver_map[i]->owner);
3024 __module_get(owner);
3025 con_driver_map[i] = csw;
3026
3027 if (!vc || !vc->vc_sw)
3028 continue;
3029
3030 j = i;
3031
3032 if (CON_IS_VISIBLE(vc)) {
3033 k = i;
3034 save_screen(vc);
3035 }
3036
3037 old_was_color = vc->vc_can_do_color;
3038 vc->vc_sw->con_deinit(vc);
3039 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3040 visual_init(vc, i, 0);
3041 set_origin(vc);
3042 update_attr(vc);
3043
3044 /* If the console changed between mono <-> color, then
3045 * the attributes in the screenbuf will be wrong. The
3046 * following resets all attributes to something sane.
3047 */
3048 if (old_was_color != vc->vc_can_do_color)
3049 clear_buffer_attributes(vc);
3050 }
3051
3052 printk("Console: switching ");
3053 if (!deflt)
3054 printk("consoles %d-%d ", first+1, last+1);
3055 if (j >= 0) {
3056 struct vc_data *vc = vc_cons[j].d;
3057
3058 printk("to %s %s %dx%d\n",
3059 vc->vc_can_do_color ? "colour" : "mono",
3060 desc, vc->vc_cols, vc->vc_rows);
3061
3062 if (k >= 0) {
3063 vc = vc_cons[k].d;
3064 update_screen(vc);
3065 }
3066 } else
3067 printk("to %s\n", desc);
3068
3069 retval = 0;
3070 err:
3071 release_console_sem();
3072 module_put(owner);
3073 return retval;
3074 };
3075
3076 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3077 static int con_is_graphics(const struct consw *csw, int first, int last)
3078 {
3079 int i, retval = 0;
3080
3081 for (i = first; i <= last; i++) {
3082 struct vc_data *vc = vc_cons[i].d;
3083
3084 if (vc && vc->vc_mode == KD_GRAPHICS) {
3085 retval = 1;
3086 break;
3087 }
3088 }
3089
3090 return retval;
3091 }
3092
3093 /**
3094 * unbind_con_driver - unbind a console driver
3095 * @csw: pointer to console driver to unregister
3096 * @first: first in range of consoles that @csw should be unbound from
3097 * @last: last in range of consoles that @csw should be unbound from
3098 * @deflt: should next bound console driver be default after @csw is unbound?
3099 *
3100 * To unbind a driver from all possible consoles, pass 0 as @first and
3101 * %MAX_NR_CONSOLES as @last.
3102 *
3103 * @deflt controls whether the console that ends up replacing @csw should be
3104 * the default console.
3105 *
3106 * RETURNS:
3107 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3108 * or 0 on success.
3109 */
3110 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3111 {
3112 struct module *owner = csw->owner;
3113 const struct consw *defcsw = NULL;
3114 struct con_driver *con_driver = NULL, *con_back = NULL;
3115 int i, retval = -ENODEV;
3116
3117 if (!try_module_get(owner))
3118 return -ENODEV;
3119
3120 acquire_console_sem();
3121
3122 /* check if driver is registered and if it is unbindable */
3123 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3124 con_driver = &registered_con_driver[i];
3125
3126 if (con_driver->con == csw &&
3127 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3128 retval = 0;
3129 break;
3130 }
3131 }
3132
3133 if (retval) {
3134 release_console_sem();
3135 goto err;
3136 }
3137
3138 retval = -ENODEV;
3139
3140 /* check if backup driver exists */
3141 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3142 con_back = &registered_con_driver[i];
3143
3144 if (con_back->con &&
3145 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3146 defcsw = con_back->con;
3147 retval = 0;
3148 break;
3149 }
3150 }
3151
3152 if (retval) {
3153 release_console_sem();
3154 goto err;
3155 }
3156
3157 if (!con_is_bound(csw)) {
3158 release_console_sem();
3159 goto err;
3160 }
3161
3162 first = max(first, con_driver->first);
3163 last = min(last, con_driver->last);
3164
3165 for (i = first; i <= last; i++) {
3166 if (con_driver_map[i] == csw) {
3167 module_put(csw->owner);
3168 con_driver_map[i] = NULL;
3169 }
3170 }
3171
3172 if (!con_is_bound(defcsw)) {
3173 const struct consw *defconsw = conswitchp;
3174
3175 defcsw->con_startup();
3176 con_back->flag |= CON_DRIVER_FLAG_INIT;
3177 /*
3178 * vgacon may change the default driver to point
3179 * to dummycon, we restore it here...
3180 */
3181 conswitchp = defconsw;
3182 }
3183
3184 if (!con_is_bound(csw))
3185 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3186
3187 release_console_sem();
3188 /* ignore return value, binding should not fail */
3189 bind_con_driver(defcsw, first, last, deflt);
3190 err:
3191 module_put(owner);
3192 return retval;
3193
3194 }
3195 EXPORT_SYMBOL(unbind_con_driver);
3196
3197 static int vt_bind(struct con_driver *con)
3198 {
3199 const struct consw *defcsw = NULL, *csw = NULL;
3200 int i, more = 1, first = -1, last = -1, deflt = 0;
3201
3202 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3203 con_is_graphics(con->con, con->first, con->last))
3204 goto err;
3205
3206 csw = con->con;
3207
3208 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3209 struct con_driver *con = &registered_con_driver[i];
3210
3211 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3212 defcsw = con->con;
3213 break;
3214 }
3215 }
3216
3217 if (!defcsw)
3218 goto err;
3219
3220 while (more) {
3221 more = 0;
3222
3223 for (i = con->first; i <= con->last; i++) {
3224 if (con_driver_map[i] == defcsw) {
3225 if (first == -1)
3226 first = i;
3227 last = i;
3228 more = 1;
3229 } else if (first != -1)
3230 break;
3231 }
3232
3233 if (first == 0 && last == MAX_NR_CONSOLES -1)
3234 deflt = 1;
3235
3236 if (first != -1)
3237 bind_con_driver(csw, first, last, deflt);
3238
3239 first = -1;
3240 last = -1;
3241 deflt = 0;
3242 }
3243
3244 err:
3245 return 0;
3246 }
3247
3248 static int vt_unbind(struct con_driver *con)
3249 {
3250 const struct consw *csw = NULL;
3251 int i, more = 1, first = -1, last = -1, deflt = 0;
3252
3253 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3254 con_is_graphics(con->con, con->first, con->last))
3255 goto err;
3256
3257 csw = con->con;
3258
3259 while (more) {
3260 more = 0;
3261
3262 for (i = con->first; i <= con->last; i++) {
3263 if (con_driver_map[i] == csw) {
3264 if (first == -1)
3265 first = i;
3266 last = i;
3267 more = 1;
3268 } else if (first != -1)
3269 break;
3270 }
3271
3272 if (first == 0 && last == MAX_NR_CONSOLES -1)
3273 deflt = 1;
3274
3275 if (first != -1)
3276 unbind_con_driver(csw, first, last, deflt);
3277
3278 first = -1;
3279 last = -1;
3280 deflt = 0;
3281 }
3282
3283 err:
3284 return 0;
3285 }
3286 #else
3287 static inline int vt_bind(struct con_driver *con)
3288 {
3289 return 0;
3290 }
3291 static inline int vt_unbind(struct con_driver *con)
3292 {
3293 return 0;
3294 }
3295 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3296
3297 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3298 const char *buf, size_t count)
3299 {
3300 struct con_driver *con = dev_get_drvdata(dev);
3301 int bind = simple_strtoul(buf, NULL, 0);
3302
3303 if (bind)
3304 vt_bind(con);
3305 else
3306 vt_unbind(con);
3307
3308 return count;
3309 }
3310
3311 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3312 char *buf)
3313 {
3314 struct con_driver *con = dev_get_drvdata(dev);
3315 int bind = con_is_bound(con->con);
3316
3317 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3318 }
3319
3320 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3321 char *buf)
3322 {
3323 struct con_driver *con = dev_get_drvdata(dev);
3324
3325 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3326 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3327 con->desc);
3328
3329 }
3330
3331 static struct device_attribute device_attrs[] = {
3332 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3333 __ATTR(name, S_IRUGO, show_name, NULL),
3334 };
3335
3336 static int vtconsole_init_device(struct con_driver *con)
3337 {
3338 int i;
3339 int error = 0;
3340
3341 con->flag |= CON_DRIVER_FLAG_ATTR;
3342 dev_set_drvdata(con->dev, con);
3343 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3344 error = device_create_file(con->dev, &device_attrs[i]);
3345 if (error)
3346 break;
3347 }
3348
3349 if (error) {
3350 while (--i >= 0)
3351 device_remove_file(con->dev, &device_attrs[i]);
3352 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3353 }
3354
3355 return error;
3356 }
3357
3358 static void vtconsole_deinit_device(struct con_driver *con)
3359 {
3360 int i;
3361
3362 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3363 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3364 device_remove_file(con->dev, &device_attrs[i]);
3365 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3366 }
3367 }
3368
3369 /**
3370 * con_is_bound - checks if driver is bound to the console
3371 * @csw: console driver
3372 *
3373 * RETURNS: zero if unbound, nonzero if bound
3374 *
3375 * Drivers can call this and if zero, they should release
3376 * all resources allocated on con_startup()
3377 */
3378 int con_is_bound(const struct consw *csw)
3379 {
3380 int i, bound = 0;
3381
3382 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3383 if (con_driver_map[i] == csw) {
3384 bound = 1;
3385 break;
3386 }
3387 }
3388
3389 return bound;
3390 }
3391 EXPORT_SYMBOL(con_is_bound);
3392
3393 /**
3394 * register_con_driver - register console driver to console layer
3395 * @csw: console driver
3396 * @first: the first console to take over, minimum value is 0
3397 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3398 *
3399 * DESCRIPTION: This function registers a console driver which can later
3400 * bind to a range of consoles specified by @first and @last. It will
3401 * also initialize the console driver by calling con_startup().
3402 */
3403 int register_con_driver(const struct consw *csw, int first, int last)
3404 {
3405 struct module *owner = csw->owner;
3406 struct con_driver *con_driver;
3407 const char *desc;
3408 int i, retval = 0;
3409
3410 if (!try_module_get(owner))
3411 return -ENODEV;
3412
3413 acquire_console_sem();
3414
3415 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3416 con_driver = &registered_con_driver[i];
3417
3418 /* already registered */
3419 if (con_driver->con == csw)
3420 retval = -EINVAL;
3421 }
3422
3423 if (retval)
3424 goto err;
3425
3426 desc = csw->con_startup();
3427
3428 if (!desc)
3429 goto err;
3430
3431 retval = -EINVAL;
3432
3433 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3434 con_driver = &registered_con_driver[i];
3435
3436 if (con_driver->con == NULL) {
3437 con_driver->con = csw;
3438 con_driver->desc = desc;
3439 con_driver->node = i;
3440 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3441 CON_DRIVER_FLAG_INIT;
3442 con_driver->first = first;
3443 con_driver->last = last;
3444 retval = 0;
3445 break;
3446 }
3447 }
3448
3449 if (retval)
3450 goto err;
3451
3452 con_driver->dev = device_create(vtconsole_class, NULL,
3453 MKDEV(0, con_driver->node),
3454 NULL, "vtcon%i",
3455 con_driver->node);
3456
3457 if (IS_ERR(con_driver->dev)) {
3458 printk(KERN_WARNING "Unable to create device for %s; "
3459 "errno = %ld\n", con_driver->desc,
3460 PTR_ERR(con_driver->dev));
3461 con_driver->dev = NULL;
3462 } else {
3463 vtconsole_init_device(con_driver);
3464 }
3465
3466 err:
3467 release_console_sem();
3468 module_put(owner);
3469 return retval;
3470 }
3471 EXPORT_SYMBOL(register_con_driver);
3472
3473 /**
3474 * unregister_con_driver - unregister console driver from console layer
3475 * @csw: console driver
3476 *
3477 * DESCRIPTION: All drivers that registers to the console layer must
3478 * call this function upon exit, or if the console driver is in a state
3479 * where it won't be able to handle console services, such as the
3480 * framebuffer console without loaded framebuffer drivers.
3481 *
3482 * The driver must unbind first prior to unregistration.
3483 */
3484 int unregister_con_driver(const struct consw *csw)
3485 {
3486 int i, retval = -ENODEV;
3487
3488 acquire_console_sem();
3489
3490 /* cannot unregister a bound driver */
3491 if (con_is_bound(csw))
3492 goto err;
3493
3494 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3495 struct con_driver *con_driver = &registered_con_driver[i];
3496
3497 if (con_driver->con == csw &&
3498 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3499 vtconsole_deinit_device(con_driver);
3500 device_destroy(vtconsole_class,
3501 MKDEV(0, con_driver->node));
3502 con_driver->con = NULL;
3503 con_driver->desc = NULL;
3504 con_driver->dev = NULL;
3505 con_driver->node = 0;
3506 con_driver->flag = 0;
3507 con_driver->first = 0;
3508 con_driver->last = 0;
3509 retval = 0;
3510 break;
3511 }
3512 }
3513 err:
3514 release_console_sem();
3515 return retval;
3516 }
3517 EXPORT_SYMBOL(unregister_con_driver);
3518
3519 /*
3520 * If we support more console drivers, this function is used
3521 * when a driver wants to take over some existing consoles
3522 * and become default driver for newly opened ones.
3523 *
3524 * take_over_console is basically a register followed by unbind
3525 */
3526 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3527 {
3528 int err;
3529
3530 err = register_con_driver(csw, first, last);
3531
3532 if (!err)
3533 bind_con_driver(csw, first, last, deflt);
3534
3535 return err;
3536 }
3537
3538 /*
3539 * give_up_console is a wrapper to unregister_con_driver. It will only
3540 * work if driver is fully unbound.
3541 */
3542 void give_up_console(const struct consw *csw)
3543 {
3544 unregister_con_driver(csw);
3545 }
3546
3547 static int __init vtconsole_class_init(void)
3548 {
3549 int i;
3550
3551 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3552 if (IS_ERR(vtconsole_class)) {
3553 printk(KERN_WARNING "Unable to create vt console class; "
3554 "errno = %ld\n", PTR_ERR(vtconsole_class));
3555 vtconsole_class = NULL;
3556 }
3557
3558 /* Add system drivers to sysfs */
3559 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3560 struct con_driver *con = &registered_con_driver[i];
3561
3562 if (con->con && !con->dev) {
3563 con->dev = device_create(vtconsole_class, NULL,
3564 MKDEV(0, con->node),
3565 NULL, "vtcon%i",
3566 con->node);
3567
3568 if (IS_ERR(con->dev)) {
3569 printk(KERN_WARNING "Unable to create "
3570 "device for %s; errno = %ld\n",
3571 con->desc, PTR_ERR(con->dev));
3572 con->dev = NULL;
3573 } else {
3574 vtconsole_init_device(con);
3575 }
3576 }
3577 }
3578
3579 return 0;
3580 }
3581 postcore_initcall(vtconsole_class_init);
3582
3583 #endif
3584
3585 /*
3586 * Screen blanking
3587 */
3588
3589 static int set_vesa_blanking(char __user *p)
3590 {
3591 unsigned int mode;
3592
3593 if (get_user(mode, p + 1))
3594 return -EFAULT;
3595
3596 vesa_blank_mode = (mode < 4) ? mode : 0;
3597 return 0;
3598 }
3599
3600 void do_blank_screen(int entering_gfx)
3601 {
3602 struct vc_data *vc = vc_cons[fg_console].d;
3603 int i;
3604
3605 WARN_CONSOLE_UNLOCKED();
3606
3607 if (console_blanked) {
3608 if (blank_state == blank_vesa_wait) {
3609 blank_state = blank_off;
3610 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3611 }
3612 return;
3613 }
3614
3615 /* entering graphics mode? */
3616 if (entering_gfx) {
3617 hide_cursor(vc);
3618 save_screen(vc);
3619 vc->vc_sw->con_blank(vc, -1, 1);
3620 console_blanked = fg_console + 1;
3621 blank_state = blank_off;
3622 set_origin(vc);
3623 return;
3624 }
3625
3626 if (blank_state != blank_normal_wait)
3627 return;
3628 blank_state = blank_off;
3629
3630 /* don't blank graphics */
3631 if (vc->vc_mode != KD_TEXT) {
3632 console_blanked = fg_console + 1;
3633 return;
3634 }
3635
3636 hide_cursor(vc);
3637 del_timer_sync(&console_timer);
3638 blank_timer_expired = 0;
3639
3640 save_screen(vc);
3641 /* In case we need to reset origin, blanking hook returns 1 */
3642 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3643 console_blanked = fg_console + 1;
3644 if (i)
3645 set_origin(vc);
3646
3647 if (console_blank_hook && console_blank_hook(1))
3648 return;
3649
3650 if (vesa_off_interval && vesa_blank_mode) {
3651 blank_state = blank_vesa_wait;
3652 mod_timer(&console_timer, jiffies + vesa_off_interval);
3653 }
3654 }
3655 EXPORT_SYMBOL(do_blank_screen);
3656
3657 /*
3658 * Called by timer as well as from vt_console_driver
3659 */
3660 void do_unblank_screen(int leaving_gfx)
3661 {
3662 struct vc_data *vc;
3663
3664 /* This should now always be called from a "sane" (read: can schedule)
3665 * context for the sake of the low level drivers, except in the special
3666 * case of oops_in_progress
3667 */
3668 if (!oops_in_progress)
3669 might_sleep();
3670
3671 WARN_CONSOLE_UNLOCKED();
3672
3673 ignore_poke = 0;
3674 if (!console_blanked)
3675 return;
3676 if (!vc_cons_allocated(fg_console)) {
3677 /* impossible */
3678 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3679 return;
3680 }
3681 vc = vc_cons[fg_console].d;
3682 if (vc->vc_mode != KD_TEXT)
3683 return; /* but leave console_blanked != 0 */
3684
3685 if (blankinterval) {
3686 mod_timer(&console_timer, jiffies + blankinterval);
3687 blank_state = blank_normal_wait;
3688 }
3689
3690 console_blanked = 0;
3691 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3692 /* Low-level driver cannot restore -> do it ourselves */
3693 update_screen(vc);
3694 if (console_blank_hook)
3695 console_blank_hook(0);
3696 set_palette(vc);
3697 set_cursor(vc);
3698 }
3699 EXPORT_SYMBOL(do_unblank_screen);
3700
3701 /*
3702 * This is called by the outside world to cause a forced unblank, mostly for
3703 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3704 * call it with 1 as an argument and so force a mode restore... that may kill
3705 * X or at least garbage the screen but would also make the Oops visible...
3706 */
3707 void unblank_screen(void)
3708 {
3709 do_unblank_screen(0);
3710 }
3711
3712 /*
3713 * We defer the timer blanking to work queue so it can take the console mutex
3714 * (console operations can still happen at irq time, but only from printk which
3715 * has the console mutex. Not perfect yet, but better than no locking
3716 */
3717 static void blank_screen_t(unsigned long dummy)
3718 {
3719 if (unlikely(!keventd_up())) {
3720 mod_timer(&console_timer, jiffies + blankinterval);
3721 return;
3722 }
3723 blank_timer_expired = 1;
3724 schedule_work(&console_work);
3725 }
3726
3727 void poke_blanked_console(void)
3728 {
3729 WARN_CONSOLE_UNLOCKED();
3730
3731 /* Add this so we quickly catch whoever might call us in a non
3732 * safe context. Nowadays, unblank_screen() isn't to be called in
3733 * atomic contexts and is allowed to schedule (with the special case
3734 * of oops_in_progress, but that isn't of any concern for this
3735 * function. --BenH.
3736 */
3737 might_sleep();
3738
3739 /* This isn't perfectly race free, but a race here would be mostly harmless,
3740 * at worse, we'll do a spurrious blank and it's unlikely
3741 */
3742 del_timer(&console_timer);
3743 blank_timer_expired = 0;
3744
3745 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3746 return;
3747 if (console_blanked)
3748 unblank_screen();
3749 else if (blankinterval) {
3750 mod_timer(&console_timer, jiffies + blankinterval);
3751 blank_state = blank_normal_wait;
3752 }
3753 }
3754
3755 /*
3756 * Palettes
3757 */
3758
3759 static void set_palette(struct vc_data *vc)
3760 {
3761 WARN_CONSOLE_UNLOCKED();
3762
3763 if (vc->vc_mode != KD_GRAPHICS)
3764 vc->vc_sw->con_set_palette(vc, color_table);
3765 }
3766
3767 static int set_get_cmap(unsigned char __user *arg, int set)
3768 {
3769 int i, j, k;
3770
3771 WARN_CONSOLE_UNLOCKED();
3772
3773 for (i = 0; i < 16; i++)
3774 if (set) {
3775 get_user(default_red[i], arg++);
3776 get_user(default_grn[i], arg++);
3777 get_user(default_blu[i], arg++);
3778 } else {
3779 put_user(default_red[i], arg++);
3780 put_user(default_grn[i], arg++);
3781 put_user(default_blu[i], arg++);
3782 }
3783 if (set) {
3784 for (i = 0; i < MAX_NR_CONSOLES; i++)
3785 if (vc_cons_allocated(i)) {
3786 for (j = k = 0; j < 16; j++) {
3787 vc_cons[i].d->vc_palette[k++] = default_red[j];
3788 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3789 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3790 }
3791 set_palette(vc_cons[i].d);
3792 }
3793 }
3794 return 0;
3795 }
3796
3797 /*
3798 * Load palette into the DAC registers. arg points to a colour
3799 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3800 */
3801
3802 int con_set_cmap(unsigned char __user *arg)
3803 {
3804 int rc;
3805
3806 acquire_console_sem();
3807 rc = set_get_cmap (arg,1);
3808 release_console_sem();
3809
3810 return rc;
3811 }
3812
3813 int con_get_cmap(unsigned char __user *arg)
3814 {
3815 int rc;
3816
3817 acquire_console_sem();
3818 rc = set_get_cmap (arg,0);
3819 release_console_sem();
3820
3821 return rc;
3822 }
3823
3824 void reset_palette(struct vc_data *vc)
3825 {
3826 int j, k;
3827 for (j=k=0; j<16; j++) {
3828 vc->vc_palette[k++] = default_red[j];
3829 vc->vc_palette[k++] = default_grn[j];
3830 vc->vc_palette[k++] = default_blu[j];
3831 }
3832 set_palette(vc);
3833 }
3834
3835 /*
3836 * Font switching
3837 *
3838 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3839 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3840 * depending on width) reserved for each character which is kinda wasty, but
3841 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3842 * is upto the actual low-level console-driver convert data into its favorite
3843 * format (maybe we should add a `fontoffset' field to the `display'
3844 * structure so we won't have to convert the fontdata all the time.
3845 * /Jes
3846 */
3847
3848 #define max_font_size 65536
3849
3850 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3851 {
3852 struct console_font font;
3853 int rc = -EINVAL;
3854 int c;
3855
3856 if (vc->vc_mode != KD_TEXT)
3857 return -EINVAL;
3858
3859 if (op->data) {
3860 font.data = kmalloc(max_font_size, GFP_KERNEL);
3861 if (!font.data)
3862 return -ENOMEM;
3863 } else
3864 font.data = NULL;
3865
3866 acquire_console_sem();
3867 if (vc->vc_sw->con_font_get)
3868 rc = vc->vc_sw->con_font_get(vc, &font);
3869 else
3870 rc = -ENOSYS;
3871 release_console_sem();
3872
3873 if (rc)
3874 goto out;
3875
3876 c = (font.width+7)/8 * 32 * font.charcount;
3877
3878 if (op->data && font.charcount > op->charcount)
3879 rc = -ENOSPC;
3880 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3881 if (font.width > op->width || font.height > op->height)
3882 rc = -ENOSPC;
3883 } else {
3884 if (font.width != 8)
3885 rc = -EIO;
3886 else if ((op->height && font.height > op->height) ||
3887 font.height > 32)
3888 rc = -ENOSPC;
3889 }
3890 if (rc)
3891 goto out;
3892
3893 op->height = font.height;
3894 op->width = font.width;
3895 op->charcount = font.charcount;
3896
3897 if (op->data && copy_to_user(op->data, font.data, c))
3898 rc = -EFAULT;
3899
3900 out:
3901 kfree(font.data);
3902 return rc;
3903 }
3904
3905 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3906 {
3907 struct console_font font;
3908 int rc = -EINVAL;
3909 int size;
3910
3911 if (vc->vc_mode != KD_TEXT)
3912 return -EINVAL;
3913 if (!op->data)
3914 return -EINVAL;
3915 if (op->charcount > 512)
3916 return -EINVAL;
3917 if (!op->height) { /* Need to guess font height [compat] */
3918 int h, i;
3919 u8 __user *charmap = op->data;
3920 u8 tmp;
3921
3922 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3923 so that we can get rid of this soon */
3924 if (!(op->flags & KD_FONT_FLAG_OLD))
3925 return -EINVAL;
3926 for (h = 32; h > 0; h--)
3927 for (i = 0; i < op->charcount; i++) {
3928 if (get_user(tmp, &charmap[32*i+h-1]))
3929 return -EFAULT;
3930 if (tmp)
3931 goto nonzero;
3932 }
3933 return -EINVAL;
3934 nonzero:
3935 op->height = h;
3936 }
3937 if (op->width <= 0 || op->width > 32 || op->height > 32)
3938 return -EINVAL;
3939 size = (op->width+7)/8 * 32 * op->charcount;
3940 if (size > max_font_size)
3941 return -ENOSPC;
3942 font.charcount = op->charcount;
3943 font.height = op->height;
3944 font.width = op->width;
3945 font.data = kmalloc(size, GFP_KERNEL);
3946 if (!font.data)
3947 return -ENOMEM;
3948 if (copy_from_user(font.data, op->data, size)) {
3949 kfree(font.data);
3950 return -EFAULT;
3951 }
3952 acquire_console_sem();
3953 if (vc->vc_sw->con_font_set)
3954 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3955 else
3956 rc = -ENOSYS;
3957 release_console_sem();
3958 kfree(font.data);
3959 return rc;
3960 }
3961
3962 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3963 {
3964 struct console_font font = {.width = op->width, .height = op->height};
3965 char name[MAX_FONT_NAME];
3966 char *s = name;
3967 int rc;
3968
3969 if (vc->vc_mode != KD_TEXT)
3970 return -EINVAL;
3971
3972 if (!op->data)
3973 s = NULL;
3974 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3975 return -EFAULT;
3976 else
3977 name[MAX_FONT_NAME - 1] = 0;
3978
3979 acquire_console_sem();
3980 if (vc->vc_sw->con_font_default)
3981 rc = vc->vc_sw->con_font_default(vc, &font, s);
3982 else
3983 rc = -ENOSYS;
3984 release_console_sem();
3985 if (!rc) {
3986 op->width = font.width;
3987 op->height = font.height;
3988 }
3989 return rc;
3990 }
3991
3992 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3993 {
3994 int con = op->height;
3995 int rc;
3996
3997 if (vc->vc_mode != KD_TEXT)
3998 return -EINVAL;
3999
4000 acquire_console_sem();
4001 if (!vc->vc_sw->con_font_copy)
4002 rc = -ENOSYS;
4003 else if (con < 0 || !vc_cons_allocated(con))
4004 rc = -ENOTTY;
4005 else if (con == vc->vc_num) /* nothing to do */
4006 rc = 0;
4007 else
4008 rc = vc->vc_sw->con_font_copy(vc, con);
4009 release_console_sem();
4010 return rc;
4011 }
4012
4013 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4014 {
4015 switch (op->op) {
4016 case KD_FONT_OP_SET:
4017 return con_font_set(vc, op);
4018 case KD_FONT_OP_GET:
4019 return con_font_get(vc, op);
4020 case KD_FONT_OP_SET_DEFAULT:
4021 return con_font_default(vc, op);
4022 case KD_FONT_OP_COPY:
4023 return con_font_copy(vc, op);
4024 }
4025 return -ENOSYS;
4026 }
4027
4028 /*
4029 * Interface exported to selection and vcs.
4030 */
4031
4032 /* used by selection */
4033 u16 screen_glyph(struct vc_data *vc, int offset)
4034 {
4035 u16 w = scr_readw(screenpos(vc, offset, 1));
4036 u16 c = w & 0xff;
4037
4038 if (w & vc->vc_hi_font_mask)
4039 c |= 0x100;
4040 return c;
4041 }
4042 EXPORT_SYMBOL_GPL(screen_glyph);
4043
4044 /* used by vcs - note the word offset */
4045 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4046 {
4047 return screenpos(vc, 2 * w_offset, viewed);
4048 }
4049
4050 void getconsxy(struct vc_data *vc, unsigned char *p)
4051 {
4052 p[0] = vc->vc_x;
4053 p[1] = vc->vc_y;
4054 }
4055
4056 void putconsxy(struct vc_data *vc, unsigned char *p)
4057 {
4058 hide_cursor(vc);
4059 gotoxy(vc, p[0], p[1]);
4060 set_cursor(vc);
4061 }
4062
4063 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4064 {
4065 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4066 return softcursor_original;
4067 return scr_readw(org);
4068 }
4069
4070 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4071 {
4072 scr_writew(val, org);
4073 if ((unsigned long)org == vc->vc_pos) {
4074 softcursor_original = -1;
4075 add_softcursor(vc);
4076 }
4077 }
4078
4079 /*
4080 * Visible symbols for modules
4081 */
4082
4083 EXPORT_SYMBOL(color_table);
4084 EXPORT_SYMBOL(default_red);
4085 EXPORT_SYMBOL(default_grn);
4086 EXPORT_SYMBOL(default_blu);
4087 EXPORT_SYMBOL(update_region);
4088 EXPORT_SYMBOL(redraw_screen);
4089 EXPORT_SYMBOL(vc_resize);
4090 EXPORT_SYMBOL(fg_console);
4091 EXPORT_SYMBOL(console_blank_hook);
4092 EXPORT_SYMBOL(console_blanked);
4093 EXPORT_SYMBOL(vc_cons);
4094 #ifndef VT_SINGLE_DRIVER
4095 EXPORT_SYMBOL(take_over_console);
4096 EXPORT_SYMBOL(give_up_console);
4097 #endif
Stable & featurefull patchset based on Linus's git branch