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ptrace: kill __ptrace_detach(), fix ->exit_state check
[linux-2.6/mini2440.git] / drivers / char / vt.c
blob60453ab3608ffe80c6086bd843ebea50b3721496
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/tiocl.h>
93 #include <linux/kbd_kern.h>
94 #include <linux/consolemap.h>
95 #include <linux/timer.h>
96 #include <linux/interrupt.h>
97 #include <linux/workqueue.h>
98 #include <linux/bootmem.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103 #include <linux/device.h>
104 #include <linux/io.h>
105 #include <asm/system.h>
106 #include <linux/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164
165 /*
166 * ignore_poke: don't unblank the screen when things are typed. This is
167 * mainly for the privacy of braille terminal users.
168 */
169 static int ignore_poke;
170
171 int do_poke_blanked_console;
172 int console_blanked;
173
174 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
175 static int blankinterval = 10*60*HZ;
176 static int vesa_off_interval;
177
178 static DECLARE_WORK(console_work, console_callback);
179
180 /*
181 * fg_console is the current virtual console,
182 * last_console is the last used one,
183 * want_console is the console we want to switch to,
184 * kmsg_redirect is the console for kernel messages,
185 */
186 int fg_console;
187 int last_console;
188 int want_console = -1;
189 int kmsg_redirect;
190
191 /*
192 * For each existing display, we have a pointer to console currently visible
193 * on that display, allowing consoles other than fg_console to be refreshed
194 * appropriately. Unless the low-level driver supplies its own display_fg
195 * variable, we use this one for the "master display".
196 */
197 static struct vc_data *master_display_fg;
198
199 /*
200 * Unfortunately, we need to delay tty echo when we're currently writing to the
201 * console since the code is (and always was) not re-entrant, so we schedule
202 * all flip requests to process context with schedule-task() and run it from
203 * console_callback().
204 */
205
206 /*
207 * For the same reason, we defer scrollback to the console callback.
208 */
209 static int scrollback_delta;
210
211 /*
212 * Hook so that the power management routines can (un)blank
213 * the console on our behalf.
214 */
215 int (*console_blank_hook)(int);
216
217 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
218 static int blank_state;
219 static int blank_timer_expired;
220 enum {
221 blank_off = 0,
222 blank_normal_wait,
223 blank_vesa_wait,
224 };
225
226 /*
227 * Notifier list for console events.
228 */
229 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
230
231 int register_vt_notifier(struct notifier_block *nb)
232 {
233 return atomic_notifier_chain_register(&vt_notifier_list, nb);
234 }
235 EXPORT_SYMBOL_GPL(register_vt_notifier);
236
237 int unregister_vt_notifier(struct notifier_block *nb)
238 {
239 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
240 }
241 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
242
243 static void notify_write(struct vc_data *vc, unsigned int unicode)
244 {
245 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
246 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
247 }
248
249 static void notify_update(struct vc_data *vc)
250 {
251 struct vt_notifier_param param = { .vc = vc };
252 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
253 }
254
255 /*
256 * Low-Level Functions
257 */
258
259 #define IS_FG(vc) ((vc)->vc_num == fg_console)
260
261 #ifdef VT_BUF_VRAM_ONLY
262 #define DO_UPDATE(vc) 0
263 #else
264 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
265 #endif
266
267 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
268 {
269 unsigned short *p;
270
271 if (!viewed)
272 p = (unsigned short *)(vc->vc_origin + offset);
273 else if (!vc->vc_sw->con_screen_pos)
274 p = (unsigned short *)(vc->vc_visible_origin + offset);
275 else
276 p = vc->vc_sw->con_screen_pos(vc, offset);
277 return p;
278 }
279
280 static inline void scrolldelta(int lines)
281 {
282 scrollback_delta += lines;
283 schedule_console_callback();
284 }
285
286 void schedule_console_callback(void)
287 {
288 schedule_work(&console_work);
289 }
290
291 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
292 {
293 unsigned short *d, *s;
294
295 if (t+nr >= b)
296 nr = b - t - 1;
297 if (b > vc->vc_rows || t >= b || nr < 1)
298 return;
299 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
300 return;
301 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
302 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
303 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
304 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
305 vc->vc_size_row * nr);
306 }
307
308 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
309 {
310 unsigned short *s;
311 unsigned int step;
312
313 if (t+nr >= b)
314 nr = b - t - 1;
315 if (b > vc->vc_rows || t >= b || nr < 1)
316 return;
317 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
318 return;
319 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
320 step = vc->vc_cols * nr;
321 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
322 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
323 }
324
325 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
326 {
327 #ifndef VT_BUF_VRAM_ONLY
328 unsigned int xx, yy, offset;
329 u16 *p;
330
331 p = (u16 *) start;
332 if (!vc->vc_sw->con_getxy) {
333 offset = (start - vc->vc_origin) / 2;
334 xx = offset % vc->vc_cols;
335 yy = offset / vc->vc_cols;
336 } else {
337 int nxx, nyy;
338 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
339 xx = nxx; yy = nyy;
340 }
341 for(;;) {
342 u16 attrib = scr_readw(p) & 0xff00;
343 int startx = xx;
344 u16 *q = p;
345 while (xx < vc->vc_cols && count) {
346 if (attrib != (scr_readw(p) & 0xff00)) {
347 if (p > q)
348 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
349 startx = xx;
350 q = p;
351 attrib = scr_readw(p) & 0xff00;
352 }
353 p++;
354 xx++;
355 count--;
356 }
357 if (p > q)
358 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
359 if (!count)
360 break;
361 xx = 0;
362 yy++;
363 if (vc->vc_sw->con_getxy) {
364 p = (u16 *)start;
365 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
366 }
367 }
368 #endif
369 }
370
371 void update_region(struct vc_data *vc, unsigned long start, int count)
372 {
373 WARN_CONSOLE_UNLOCKED();
374
375 if (DO_UPDATE(vc)) {
376 hide_cursor(vc);
377 do_update_region(vc, start, count);
378 set_cursor(vc);
379 }
380 }
381
382 /* Structure of attributes is hardware-dependent */
383
384 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
385 u8 _underline, u8 _reverse, u8 _italic)
386 {
387 if (vc->vc_sw->con_build_attr)
388 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
389 _blink, _underline, _reverse, _italic);
390
391 #ifndef VT_BUF_VRAM_ONLY
392 /*
393 * ++roman: I completely changed the attribute format for monochrome
394 * mode (!can_do_color). The formerly used MDA (monochrome display
395 * adapter) format didn't allow the combination of certain effects.
396 * Now the attribute is just a bit vector:
397 * Bit 0..1: intensity (0..2)
398 * Bit 2 : underline
399 * Bit 3 : reverse
400 * Bit 7 : blink
401 */
402 {
403 u8 a = _color;
404 if (!vc->vc_can_do_color)
405 return _intensity |
406 (_italic ? 2 : 0) |
407 (_underline ? 4 : 0) |
408 (_reverse ? 8 : 0) |
409 (_blink ? 0x80 : 0);
410 if (_italic)
411 a = (a & 0xF0) | vc->vc_itcolor;
412 else if (_underline)
413 a = (a & 0xf0) | vc->vc_ulcolor;
414 else if (_intensity == 0)
415 a = (a & 0xf0) | vc->vc_ulcolor;
416 if (_reverse)
417 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
418 if (_blink)
419 a ^= 0x80;
420 if (_intensity == 2)
421 a ^= 0x08;
422 if (vc->vc_hi_font_mask == 0x100)
423 a <<= 1;
424 return a;
425 }
426 #else
427 return 0;
428 #endif
429 }
430
431 static void update_attr(struct vc_data *vc)
432 {
433 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
434 vc->vc_blink, vc->vc_underline,
435 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
436 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
437 }
438
439 /* Note: inverting the screen twice should revert to the original state */
440 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
441 {
442 unsigned short *p;
443
444 WARN_CONSOLE_UNLOCKED();
445
446 count /= 2;
447 p = screenpos(vc, offset, viewed);
448 if (vc->vc_sw->con_invert_region)
449 vc->vc_sw->con_invert_region(vc, p, count);
450 #ifndef VT_BUF_VRAM_ONLY
451 else {
452 u16 *q = p;
453 int cnt = count;
454 u16 a;
455
456 if (!vc->vc_can_do_color) {
457 while (cnt--) {
458 a = scr_readw(q);
459 a ^= 0x0800;
460 scr_writew(a, q);
461 q++;
462 }
463 } else if (vc->vc_hi_font_mask == 0x100) {
464 while (cnt--) {
465 a = scr_readw(q);
466 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
467 scr_writew(a, q);
468 q++;
469 }
470 } else {
471 while (cnt--) {
472 a = scr_readw(q);
473 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
474 scr_writew(a, q);
475 q++;
476 }
477 }
478 }
479 #endif
480 if (DO_UPDATE(vc))
481 do_update_region(vc, (unsigned long) p, count);
482 }
483
484 /* used by selection: complement pointer position */
485 void complement_pos(struct vc_data *vc, int offset)
486 {
487 static int old_offset = -1;
488 static unsigned short old;
489 static unsigned short oldx, oldy;
490
491 WARN_CONSOLE_UNLOCKED();
492
493 if (old_offset != -1 && old_offset >= 0 &&
494 old_offset < vc->vc_screenbuf_size) {
495 scr_writew(old, screenpos(vc, old_offset, 1));
496 if (DO_UPDATE(vc))
497 vc->vc_sw->con_putc(vc, old, oldy, oldx);
498 }
499
500 old_offset = offset;
501
502 if (offset != -1 && offset >= 0 &&
503 offset < vc->vc_screenbuf_size) {
504 unsigned short new;
505 unsigned short *p;
506 p = screenpos(vc, offset, 1);
507 old = scr_readw(p);
508 new = old ^ vc->vc_complement_mask;
509 scr_writew(new, p);
510 if (DO_UPDATE(vc)) {
511 oldx = (offset >> 1) % vc->vc_cols;
512 oldy = (offset >> 1) / vc->vc_cols;
513 vc->vc_sw->con_putc(vc, new, oldy, oldx);
514 }
515 }
516
517 }
518
519 static void insert_char(struct vc_data *vc, unsigned int nr)
520 {
521 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
522
523 p = q + vc->vc_cols - nr - vc->vc_x;
524 while (--p >= q)
525 scr_writew(scr_readw(p), p + nr);
526 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
527 vc->vc_need_wrap = 0;
528 if (DO_UPDATE(vc)) {
529 unsigned short oldattr = vc->vc_attr;
530 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
531 vc->vc_cols - vc->vc_x - nr);
532 vc->vc_attr = vc->vc_video_erase_char >> 8;
533 while (nr--)
534 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
535 vc->vc_attr = oldattr;
536 }
537 }
538
539 static void delete_char(struct vc_data *vc, unsigned int nr)
540 {
541 unsigned int i = vc->vc_x;
542 unsigned short *p = (unsigned short *)vc->vc_pos;
543
544 while (++i <= vc->vc_cols - nr) {
545 scr_writew(scr_readw(p+nr), p);
546 p++;
547 }
548 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
549 vc->vc_need_wrap = 0;
550 if (DO_UPDATE(vc)) {
551 unsigned short oldattr = vc->vc_attr;
552 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
553 vc->vc_cols - vc->vc_x - nr);
554 vc->vc_attr = vc->vc_video_erase_char >> 8;
555 while (nr--)
556 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
557 vc->vc_cols - 1 - nr);
558 vc->vc_attr = oldattr;
559 }
560 }
561
562 static int softcursor_original;
563
564 static void add_softcursor(struct vc_data *vc)
565 {
566 int i = scr_readw((u16 *) vc->vc_pos);
567 u32 type = vc->vc_cursor_type;
568
569 if (! (type & 0x10)) return;
570 if (softcursor_original != -1) return;
571 softcursor_original = i;
572 i |= ((type >> 8) & 0xff00 );
573 i ^= ((type) & 0xff00 );
574 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
575 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
576 scr_writew(i, (u16 *) vc->vc_pos);
577 if (DO_UPDATE(vc))
578 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
579 }
580
581 static void hide_softcursor(struct vc_data *vc)
582 {
583 if (softcursor_original != -1) {
584 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
585 if (DO_UPDATE(vc))
586 vc->vc_sw->con_putc(vc, softcursor_original,
587 vc->vc_y, vc->vc_x);
588 softcursor_original = -1;
589 }
590 }
591
592 static void hide_cursor(struct vc_data *vc)
593 {
594 if (vc == sel_cons)
595 clear_selection();
596 vc->vc_sw->con_cursor(vc, CM_ERASE);
597 hide_softcursor(vc);
598 }
599
600 static void set_cursor(struct vc_data *vc)
601 {
602 if (!IS_FG(vc) || console_blanked ||
603 vc->vc_mode == KD_GRAPHICS)
604 return;
605 if (vc->vc_deccm) {
606 if (vc == sel_cons)
607 clear_selection();
608 add_softcursor(vc);
609 if ((vc->vc_cursor_type & 0x0f) != 1)
610 vc->vc_sw->con_cursor(vc, CM_DRAW);
611 } else
612 hide_cursor(vc);
613 }
614
615 static void set_origin(struct vc_data *vc)
616 {
617 WARN_CONSOLE_UNLOCKED();
618
619 if (!CON_IS_VISIBLE(vc) ||
620 !vc->vc_sw->con_set_origin ||
621 !vc->vc_sw->con_set_origin(vc))
622 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
623 vc->vc_visible_origin = vc->vc_origin;
624 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
625 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
626 }
627
628 static inline void save_screen(struct vc_data *vc)
629 {
630 WARN_CONSOLE_UNLOCKED();
631
632 if (vc->vc_sw->con_save_screen)
633 vc->vc_sw->con_save_screen(vc);
634 }
635
636 /*
637 * Redrawing of screen
638 */
639
640 static void clear_buffer_attributes(struct vc_data *vc)
641 {
642 unsigned short *p = (unsigned short *)vc->vc_origin;
643 int count = vc->vc_screenbuf_size / 2;
644 int mask = vc->vc_hi_font_mask | 0xff;
645
646 for (; count > 0; count--, p++) {
647 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
648 }
649 }
650
651 void redraw_screen(struct vc_data *vc, int is_switch)
652 {
653 int redraw = 0;
654
655 WARN_CONSOLE_UNLOCKED();
656
657 if (!vc) {
658 /* strange ... */
659 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
660 return;
661 }
662
663 if (is_switch) {
664 struct vc_data *old_vc = vc_cons[fg_console].d;
665 if (old_vc == vc)
666 return;
667 if (!CON_IS_VISIBLE(vc))
668 redraw = 1;
669 *vc->vc_display_fg = vc;
670 fg_console = vc->vc_num;
671 hide_cursor(old_vc);
672 if (!CON_IS_VISIBLE(old_vc)) {
673 save_screen(old_vc);
674 set_origin(old_vc);
675 }
676 } else {
677 hide_cursor(vc);
678 redraw = 1;
679 }
680
681 if (redraw) {
682 int update;
683 int old_was_color = vc->vc_can_do_color;
684
685 set_origin(vc);
686 update = vc->vc_sw->con_switch(vc);
687 set_palette(vc);
688 /*
689 * If console changed from mono<->color, the best we can do
690 * is to clear the buffer attributes. As it currently stands,
691 * rebuilding new attributes from the old buffer is not doable
692 * without overly complex code.
693 */
694 if (old_was_color != vc->vc_can_do_color) {
695 update_attr(vc);
696 clear_buffer_attributes(vc);
697 }
698 if (update && vc->vc_mode != KD_GRAPHICS)
699 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
700 }
701 set_cursor(vc);
702 if (is_switch) {
703 set_leds();
704 compute_shiftstate();
705 notify_update(vc);
706 }
707 }
708
709 /*
710 * Allocation, freeing and resizing of VTs.
711 */
712
713 int vc_cons_allocated(unsigned int i)
714 {
715 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
716 }
717
718 static void visual_init(struct vc_data *vc, int num, int init)
719 {
720 /* ++Geert: vc->vc_sw->con_init determines console size */
721 if (vc->vc_sw)
722 module_put(vc->vc_sw->owner);
723 vc->vc_sw = conswitchp;
724 #ifndef VT_SINGLE_DRIVER
725 if (con_driver_map[num])
726 vc->vc_sw = con_driver_map[num];
727 #endif
728 __module_get(vc->vc_sw->owner);
729 vc->vc_num = num;
730 vc->vc_display_fg = &master_display_fg;
731 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
732 vc->vc_uni_pagedir = 0;
733 vc->vc_hi_font_mask = 0;
734 vc->vc_complement_mask = 0;
735 vc->vc_can_do_color = 0;
736 vc->vc_sw->con_init(vc, init);
737 if (!vc->vc_complement_mask)
738 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
739 vc->vc_s_complement_mask = vc->vc_complement_mask;
740 vc->vc_size_row = vc->vc_cols << 1;
741 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
742 }
743
744 int vc_allocate(unsigned int currcons) /* return 0 on success */
745 {
746 WARN_CONSOLE_UNLOCKED();
747
748 if (currcons >= MAX_NR_CONSOLES)
749 return -ENXIO;
750 if (!vc_cons[currcons].d) {
751 struct vc_data *vc;
752 struct vt_notifier_param param;
753
754 /* prevent users from taking too much memory */
755 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
756 return -EPERM;
757
758 /* due to the granularity of kmalloc, we waste some memory here */
759 /* the alloc is done in two steps, to optimize the common situation
760 of a 25x80 console (structsize=216, screenbuf_size=4000) */
761 /* although the numbers above are not valid since long ago, the
762 point is still up-to-date and the comment still has its value
763 even if only as a historical artifact. --mj, July 1998 */
764 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
765 if (!vc)
766 return -ENOMEM;
767 vc_cons[currcons].d = vc;
768 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
769 visual_init(vc, currcons, 1);
770 if (!*vc->vc_uni_pagedir_loc)
771 con_set_default_unimap(vc);
772 if (!vc->vc_kmalloced)
773 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
774 if (!vc->vc_screenbuf) {
775 kfree(vc);
776 vc_cons[currcons].d = NULL;
777 return -ENOMEM;
778 }
779 vc->vc_kmalloced = 1;
780 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
781 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
782 }
783 return 0;
784 }
785
786 static inline int resize_screen(struct vc_data *vc, int width, int height,
787 int user)
788 {
789 /* Resizes the resolution of the display adapater */
790 int err = 0;
791
792 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
793 err = vc->vc_sw->con_resize(vc, width, height, user);
794
795 return err;
796 }
797
798 /*
799 * Change # of rows and columns (0 means unchanged/the size of fg_console)
800 * [this is to be used together with some user program
801 * like resize that changes the hardware videomode]
802 */
803 #define VC_RESIZE_MAXCOL (32767)
804 #define VC_RESIZE_MAXROW (32767)
805
806 /**
807 * vc_do_resize - resizing method for the tty
808 * @tty: tty being resized
809 * @real_tty: real tty (different to tty if a pty/tty pair)
810 * @vc: virtual console private data
811 * @cols: columns
812 * @lines: lines
813 *
814 * Resize a virtual console, clipping according to the actual constraints.
815 * If the caller passes a tty structure then update the termios winsize
816 * information and perform any neccessary signal handling.
817 *
818 * Caller must hold the console semaphore. Takes the termios mutex and
819 * ctrl_lock of the tty IFF a tty is passed.
820 */
821
822 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
823 unsigned int cols, unsigned int lines)
824 {
825 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
826 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
827 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
828 unsigned int end, user;
829 unsigned short *newscreen;
830
831 WARN_CONSOLE_UNLOCKED();
832
833 if (!vc)
834 return -ENXIO;
835
836 user = vc->vc_resize_user;
837 vc->vc_resize_user = 0;
838
839 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
840 return -EINVAL;
841
842 new_cols = (cols ? cols : vc->vc_cols);
843 new_rows = (lines ? lines : vc->vc_rows);
844 new_row_size = new_cols << 1;
845 new_screen_size = new_row_size * new_rows;
846
847 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
848 return 0;
849
850 newscreen = kmalloc(new_screen_size, GFP_USER);
851 if (!newscreen)
852 return -ENOMEM;
853
854 old_rows = vc->vc_rows;
855 old_cols = vc->vc_cols;
856 old_row_size = vc->vc_size_row;
857 old_screen_size = vc->vc_screenbuf_size;
858
859 err = resize_screen(vc, new_cols, new_rows, user);
860 if (err) {
861 kfree(newscreen);
862 return err;
863 }
864
865 vc->vc_rows = new_rows;
866 vc->vc_cols = new_cols;
867 vc->vc_size_row = new_row_size;
868 vc->vc_screenbuf_size = new_screen_size;
869
870 rlth = min(old_row_size, new_row_size);
871 rrem = new_row_size - rlth;
872 old_origin = vc->vc_origin;
873 new_origin = (long) newscreen;
874 new_scr_end = new_origin + new_screen_size;
875
876 if (vc->vc_y > new_rows) {
877 if (old_rows - vc->vc_y < new_rows) {
878 /*
879 * Cursor near the bottom, copy contents from the
880 * bottom of buffer
881 */
882 old_origin += (old_rows - new_rows) * old_row_size;
883 end = vc->vc_scr_end;
884 } else {
885 /*
886 * Cursor is in no man's land, copy 1/2 screenful
887 * from the top and bottom of cursor position
888 */
889 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
890 end = old_origin + (old_row_size * new_rows);
891 }
892 } else
893 /*
894 * Cursor near the top, copy contents from the top of buffer
895 */
896 end = (old_rows > new_rows) ? old_origin +
897 (old_row_size * new_rows) :
898 vc->vc_scr_end;
899
900 update_attr(vc);
901
902 while (old_origin < end) {
903 scr_memcpyw((unsigned short *) new_origin,
904 (unsigned short *) old_origin, rlth);
905 if (rrem)
906 scr_memsetw((void *)(new_origin + rlth),
907 vc->vc_video_erase_char, rrem);
908 old_origin += old_row_size;
909 new_origin += new_row_size;
910 }
911 if (new_scr_end > new_origin)
912 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
913 new_scr_end - new_origin);
914 if (vc->vc_kmalloced)
915 kfree(vc->vc_screenbuf);
916 vc->vc_screenbuf = newscreen;
917 vc->vc_kmalloced = 1;
918 vc->vc_screenbuf_size = new_screen_size;
919 set_origin(vc);
920
921 /* do part of a reset_terminal() */
922 vc->vc_top = 0;
923 vc->vc_bottom = vc->vc_rows;
924 gotoxy(vc, vc->vc_x, vc->vc_y);
925 save_cur(vc);
926
927 if (tty) {
928 /* Rewrite the requested winsize data with the actual
929 resulting sizes */
930 struct winsize ws;
931 memset(&ws, 0, sizeof(ws));
932 ws.ws_row = vc->vc_rows;
933 ws.ws_col = vc->vc_cols;
934 ws.ws_ypixel = vc->vc_scan_lines;
935 tty_do_resize(tty, &ws);
936 }
937
938 if (CON_IS_VISIBLE(vc))
939 update_screen(vc);
940 return err;
941 }
942
943 /**
944 * vc_resize - resize a VT
945 * @vc: virtual console
946 * @cols: columns
947 * @rows: rows
948 *
949 * Resize a virtual console as seen from the console end of things. We
950 * use the common vc_do_resize methods to update the structures. The
951 * caller must hold the console sem to protect console internals and
952 * vc->vc_tty
953 */
954
955 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
956 {
957 return vc_do_resize(vc->vc_tty, vc, cols, rows);
958 }
959
960 /**
961 * vt_resize - resize a VT
962 * @tty: tty to resize
963 * @ws: winsize attributes
964 *
965 * Resize a virtual terminal. This is called by the tty layer as we
966 * register our own handler for resizing. The mutual helper does all
967 * the actual work.
968 *
969 * Takes the console sem and the called methods then take the tty
970 * termios_mutex and the tty ctrl_lock in that order.
971 */
972 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
973 {
974 struct vc_data *vc = tty->driver_data;
975 int ret;
976
977 acquire_console_sem();
978 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
979 release_console_sem();
980 return ret;
981 }
982
983 void vc_deallocate(unsigned int currcons)
984 {
985 WARN_CONSOLE_UNLOCKED();
986
987 if (vc_cons_allocated(currcons)) {
988 struct vc_data *vc = vc_cons[currcons].d;
989 struct vt_notifier_param param = { .vc = vc };
990 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
991 vc->vc_sw->con_deinit(vc);
992 put_pid(vc->vt_pid);
993 module_put(vc->vc_sw->owner);
994 if (vc->vc_kmalloced)
995 kfree(vc->vc_screenbuf);
996 if (currcons >= MIN_NR_CONSOLES)
997 kfree(vc);
998 vc_cons[currcons].d = NULL;
999 }
1000 }
1001
1002 /*
1003 * VT102 emulator
1004 */
1005
1006 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1007 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1008 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1009
1010 #define decarm VC_REPEAT
1011 #define decckm VC_CKMODE
1012 #define kbdapplic VC_APPLIC
1013 #define lnm VC_CRLF
1014
1015 /*
1016 * this is what the terminal answers to a ESC-Z or csi0c query.
1017 */
1018 #define VT100ID "\033[?1;2c"
1019 #define VT102ID "\033[?6c"
1020
1021 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1022 8,12,10,14, 9,13,11,15 };
1023
1024 /* the default colour table, for VGA+ colour systems */
1025 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1026 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1027 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1028 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1029 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1030 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1031
1032 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1033 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1034 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1035
1036 /*
1037 * gotoxy() must verify all boundaries, because the arguments
1038 * might also be negative. If the given position is out of
1039 * bounds, the cursor is placed at the nearest margin.
1040 */
1041 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1042 {
1043 int min_y, max_y;
1044
1045 if (new_x < 0)
1046 vc->vc_x = 0;
1047 else {
1048 if (new_x >= vc->vc_cols)
1049 vc->vc_x = vc->vc_cols - 1;
1050 else
1051 vc->vc_x = new_x;
1052 }
1053
1054 if (vc->vc_decom) {
1055 min_y = vc->vc_top;
1056 max_y = vc->vc_bottom;
1057 } else {
1058 min_y = 0;
1059 max_y = vc->vc_rows;
1060 }
1061 if (new_y < min_y)
1062 vc->vc_y = min_y;
1063 else if (new_y >= max_y)
1064 vc->vc_y = max_y - 1;
1065 else
1066 vc->vc_y = new_y;
1067 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1068 vc->vc_need_wrap = 0;
1069 }
1070
1071 /* for absolute user moves, when decom is set */
1072 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1073 {
1074 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1075 }
1076
1077 void scrollback(struct vc_data *vc, int lines)
1078 {
1079 if (!lines)
1080 lines = vc->vc_rows / 2;
1081 scrolldelta(-lines);
1082 }
1083
1084 void scrollfront(struct vc_data *vc, int lines)
1085 {
1086 if (!lines)
1087 lines = vc->vc_rows / 2;
1088 scrolldelta(lines);
1089 }
1090
1091 static void lf(struct vc_data *vc)
1092 {
1093 /* don't scroll if above bottom of scrolling region, or
1094 * if below scrolling region
1095 */
1096 if (vc->vc_y + 1 == vc->vc_bottom)
1097 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1098 else if (vc->vc_y < vc->vc_rows - 1) {
1099 vc->vc_y++;
1100 vc->vc_pos += vc->vc_size_row;
1101 }
1102 vc->vc_need_wrap = 0;
1103 notify_write(vc, '\n');
1104 }
1105
1106 static void ri(struct vc_data *vc)
1107 {
1108 /* don't scroll if below top of scrolling region, or
1109 * if above scrolling region
1110 */
1111 if (vc->vc_y == vc->vc_top)
1112 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1113 else if (vc->vc_y > 0) {
1114 vc->vc_y--;
1115 vc->vc_pos -= vc->vc_size_row;
1116 }
1117 vc->vc_need_wrap = 0;
1118 }
1119
1120 static inline void cr(struct vc_data *vc)
1121 {
1122 vc->vc_pos -= vc->vc_x << 1;
1123 vc->vc_need_wrap = vc->vc_x = 0;
1124 notify_write(vc, '\r');
1125 }
1126
1127 static inline void bs(struct vc_data *vc)
1128 {
1129 if (vc->vc_x) {
1130 vc->vc_pos -= 2;
1131 vc->vc_x--;
1132 vc->vc_need_wrap = 0;
1133 notify_write(vc, '\b');
1134 }
1135 }
1136
1137 static inline void del(struct vc_data *vc)
1138 {
1139 /* ignored */
1140 }
1141
1142 static void csi_J(struct vc_data *vc, int vpar)
1143 {
1144 unsigned int count;
1145 unsigned short * start;
1146
1147 switch (vpar) {
1148 case 0: /* erase from cursor to end of display */
1149 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1150 start = (unsigned short *)vc->vc_pos;
1151 if (DO_UPDATE(vc)) {
1152 /* do in two stages */
1153 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1154 vc->vc_cols - vc->vc_x);
1155 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1156 vc->vc_rows - vc->vc_y - 1,
1157 vc->vc_cols);
1158 }
1159 break;
1160 case 1: /* erase from start to cursor */
1161 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1162 start = (unsigned short *)vc->vc_origin;
1163 if (DO_UPDATE(vc)) {
1164 /* do in two stages */
1165 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1166 vc->vc_cols);
1167 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1168 vc->vc_x + 1);
1169 }
1170 break;
1171 case 2: /* erase whole display */
1172 count = vc->vc_cols * vc->vc_rows;
1173 start = (unsigned short *)vc->vc_origin;
1174 if (DO_UPDATE(vc))
1175 vc->vc_sw->con_clear(vc, 0, 0,
1176 vc->vc_rows,
1177 vc->vc_cols);
1178 break;
1179 default:
1180 return;
1181 }
1182 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1183 vc->vc_need_wrap = 0;
1184 }
1185
1186 static void csi_K(struct vc_data *vc, int vpar)
1187 {
1188 unsigned int count;
1189 unsigned short * start;
1190
1191 switch (vpar) {
1192 case 0: /* erase from cursor to end of line */
1193 count = vc->vc_cols - vc->vc_x;
1194 start = (unsigned short *)vc->vc_pos;
1195 if (DO_UPDATE(vc))
1196 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1197 vc->vc_cols - vc->vc_x);
1198 break;
1199 case 1: /* erase from start of line to cursor */
1200 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1201 count = vc->vc_x + 1;
1202 if (DO_UPDATE(vc))
1203 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1204 vc->vc_x + 1);
1205 break;
1206 case 2: /* erase whole line */
1207 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1208 count = vc->vc_cols;
1209 if (DO_UPDATE(vc))
1210 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1211 vc->vc_cols);
1212 break;
1213 default:
1214 return;
1215 }
1216 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1217 vc->vc_need_wrap = 0;
1218 }
1219
1220 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1221 { /* not vt100? */
1222 int count;
1223
1224 if (!vpar)
1225 vpar++;
1226 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1227
1228 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1229 if (DO_UPDATE(vc))
1230 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1231 vc->vc_need_wrap = 0;
1232 }
1233
1234 static void default_attr(struct vc_data *vc)
1235 {
1236 vc->vc_intensity = 1;
1237 vc->vc_italic = 0;
1238 vc->vc_underline = 0;
1239 vc->vc_reverse = 0;
1240 vc->vc_blink = 0;
1241 vc->vc_color = vc->vc_def_color;
1242 }
1243
1244 /* console_sem is held */
1245 static void csi_m(struct vc_data *vc)
1246 {
1247 int i;
1248
1249 for (i = 0; i <= vc->vc_npar; i++)
1250 switch (vc->vc_par[i]) {
1251 case 0: /* all attributes off */
1252 default_attr(vc);
1253 break;
1254 case 1:
1255 vc->vc_intensity = 2;
1256 break;
1257 case 2:
1258 vc->vc_intensity = 0;
1259 break;
1260 case 3:
1261 vc->vc_italic = 1;
1262 break;
1263 case 4:
1264 vc->vc_underline = 1;
1265 break;
1266 case 5:
1267 vc->vc_blink = 1;
1268 break;
1269 case 7:
1270 vc->vc_reverse = 1;
1271 break;
1272 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1273 * Select primary font, don't display
1274 * control chars if defined, don't set
1275 * bit 8 on output.
1276 */
1277 vc->vc_translate = set_translate(vc->vc_charset == 0
1278 ? vc->vc_G0_charset
1279 : vc->vc_G1_charset, vc);
1280 vc->vc_disp_ctrl = 0;
1281 vc->vc_toggle_meta = 0;
1282 break;
1283 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1284 * Select first alternate font, lets
1285 * chars < 32 be displayed as ROM chars.
1286 */
1287 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1288 vc->vc_disp_ctrl = 1;
1289 vc->vc_toggle_meta = 0;
1290 break;
1291 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1292 * Select second alternate font, toggle
1293 * high bit before displaying as ROM char.
1294 */
1295 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1296 vc->vc_disp_ctrl = 1;
1297 vc->vc_toggle_meta = 1;
1298 break;
1299 case 21:
1300 case 22:
1301 vc->vc_intensity = 1;
1302 break;
1303 case 23:
1304 vc->vc_italic = 0;
1305 break;
1306 case 24:
1307 vc->vc_underline = 0;
1308 break;
1309 case 25:
1310 vc->vc_blink = 0;
1311 break;
1312 case 27:
1313 vc->vc_reverse = 0;
1314 break;
1315 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1316 * Enables underscore, white foreground
1317 * with white underscore (Linux - use
1318 * default foreground).
1319 */
1320 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1321 vc->vc_underline = 1;
1322 break;
1323 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Disable underline option.
1325 * Reset colour to default? It did this
1326 * before...
1327 */
1328 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1329 vc->vc_underline = 0;
1330 break;
1331 case 49:
1332 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1333 break;
1334 default:
1335 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1336 vc->vc_color = color_table[vc->vc_par[i] - 30]
1337 | (vc->vc_color & 0xf0);
1338 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1339 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1340 | (vc->vc_color & 0x0f);
1341 break;
1342 }
1343 update_attr(vc);
1344 }
1345
1346 static void respond_string(const char *p, struct tty_struct *tty)
1347 {
1348 while (*p) {
1349 tty_insert_flip_char(tty, *p, 0);
1350 p++;
1351 }
1352 con_schedule_flip(tty);
1353 }
1354
1355 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1356 {
1357 char buf[40];
1358
1359 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1360 respond_string(buf, tty);
1361 }
1362
1363 static inline void status_report(struct tty_struct *tty)
1364 {
1365 respond_string("\033[0n", tty); /* Terminal ok */
1366 }
1367
1368 static inline void respond_ID(struct tty_struct * tty)
1369 {
1370 respond_string(VT102ID, tty);
1371 }
1372
1373 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1374 {
1375 char buf[8];
1376
1377 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1378 (char)('!' + mry));
1379 respond_string(buf, tty);
1380 }
1381
1382 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1383 int mouse_reporting(void)
1384 {
1385 return vc_cons[fg_console].d->vc_report_mouse;
1386 }
1387
1388 /* console_sem is held */
1389 static void set_mode(struct vc_data *vc, int on_off)
1390 {
1391 int i;
1392
1393 for (i = 0; i <= vc->vc_npar; i++)
1394 if (vc->vc_ques) {
1395 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1396 case 1: /* Cursor keys send ^[Ox/^[[x */
1397 if (on_off)
1398 set_kbd(vc, decckm);
1399 else
1400 clr_kbd(vc, decckm);
1401 break;
1402 case 3: /* 80/132 mode switch unimplemented */
1403 vc->vc_deccolm = on_off;
1404 #if 0
1405 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1406 /* this alone does not suffice; some user mode
1407 utility has to change the hardware regs */
1408 #endif
1409 break;
1410 case 5: /* Inverted screen on/off */
1411 if (vc->vc_decscnm != on_off) {
1412 vc->vc_decscnm = on_off;
1413 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1414 update_attr(vc);
1415 }
1416 break;
1417 case 6: /* Origin relative/absolute */
1418 vc->vc_decom = on_off;
1419 gotoxay(vc, 0, 0);
1420 break;
1421 case 7: /* Autowrap on/off */
1422 vc->vc_decawm = on_off;
1423 break;
1424 case 8: /* Autorepeat on/off */
1425 if (on_off)
1426 set_kbd(vc, decarm);
1427 else
1428 clr_kbd(vc, decarm);
1429 break;
1430 case 9:
1431 vc->vc_report_mouse = on_off ? 1 : 0;
1432 break;
1433 case 25: /* Cursor on/off */
1434 vc->vc_deccm = on_off;
1435 break;
1436 case 1000:
1437 vc->vc_report_mouse = on_off ? 2 : 0;
1438 break;
1439 }
1440 } else {
1441 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1442 case 3: /* Monitor (display ctrls) */
1443 vc->vc_disp_ctrl = on_off;
1444 break;
1445 case 4: /* Insert Mode on/off */
1446 vc->vc_decim = on_off;
1447 break;
1448 case 20: /* Lf, Enter == CrLf/Lf */
1449 if (on_off)
1450 set_kbd(vc, lnm);
1451 else
1452 clr_kbd(vc, lnm);
1453 break;
1454 }
1455 }
1456 }
1457
1458 /* console_sem is held */
1459 static void setterm_command(struct vc_data *vc)
1460 {
1461 switch(vc->vc_par[0]) {
1462 case 1: /* set color for underline mode */
1463 if (vc->vc_can_do_color &&
1464 vc->vc_par[1] < 16) {
1465 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1466 if (vc->vc_underline)
1467 update_attr(vc);
1468 }
1469 break;
1470 case 2: /* set color for half intensity mode */
1471 if (vc->vc_can_do_color &&
1472 vc->vc_par[1] < 16) {
1473 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1474 if (vc->vc_intensity == 0)
1475 update_attr(vc);
1476 }
1477 break;
1478 case 8: /* store colors as defaults */
1479 vc->vc_def_color = vc->vc_attr;
1480 if (vc->vc_hi_font_mask == 0x100)
1481 vc->vc_def_color >>= 1;
1482 default_attr(vc);
1483 update_attr(vc);
1484 break;
1485 case 9: /* set blanking interval */
1486 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1487 poke_blanked_console();
1488 break;
1489 case 10: /* set bell frequency in Hz */
1490 if (vc->vc_npar >= 1)
1491 vc->vc_bell_pitch = vc->vc_par[1];
1492 else
1493 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1494 break;
1495 case 11: /* set bell duration in msec */
1496 if (vc->vc_npar >= 1)
1497 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1498 vc->vc_par[1] * HZ / 1000 : 0;
1499 else
1500 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1501 break;
1502 case 12: /* bring specified console to the front */
1503 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1504 set_console(vc->vc_par[1] - 1);
1505 break;
1506 case 13: /* unblank the screen */
1507 poke_blanked_console();
1508 break;
1509 case 14: /* set vesa powerdown interval */
1510 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1511 break;
1512 case 15: /* activate the previous console */
1513 set_console(last_console);
1514 break;
1515 }
1516 }
1517
1518 /* console_sem is held */
1519 static void csi_at(struct vc_data *vc, unsigned int nr)
1520 {
1521 if (nr > vc->vc_cols - vc->vc_x)
1522 nr = vc->vc_cols - vc->vc_x;
1523 else if (!nr)
1524 nr = 1;
1525 insert_char(vc, nr);
1526 }
1527
1528 /* console_sem is held */
1529 static void csi_L(struct vc_data *vc, unsigned int nr)
1530 {
1531 if (nr > vc->vc_rows - vc->vc_y)
1532 nr = vc->vc_rows - vc->vc_y;
1533 else if (!nr)
1534 nr = 1;
1535 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1536 vc->vc_need_wrap = 0;
1537 }
1538
1539 /* console_sem is held */
1540 static void csi_P(struct vc_data *vc, unsigned int nr)
1541 {
1542 if (nr > vc->vc_cols - vc->vc_x)
1543 nr = vc->vc_cols - vc->vc_x;
1544 else if (!nr)
1545 nr = 1;
1546 delete_char(vc, nr);
1547 }
1548
1549 /* console_sem is held */
1550 static void csi_M(struct vc_data *vc, unsigned int nr)
1551 {
1552 if (nr > vc->vc_rows - vc->vc_y)
1553 nr = vc->vc_rows - vc->vc_y;
1554 else if (!nr)
1555 nr=1;
1556 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1557 vc->vc_need_wrap = 0;
1558 }
1559
1560 /* console_sem is held (except via vc_init->reset_terminal */
1561 static void save_cur(struct vc_data *vc)
1562 {
1563 vc->vc_saved_x = vc->vc_x;
1564 vc->vc_saved_y = vc->vc_y;
1565 vc->vc_s_intensity = vc->vc_intensity;
1566 vc->vc_s_italic = vc->vc_italic;
1567 vc->vc_s_underline = vc->vc_underline;
1568 vc->vc_s_blink = vc->vc_blink;
1569 vc->vc_s_reverse = vc->vc_reverse;
1570 vc->vc_s_charset = vc->vc_charset;
1571 vc->vc_s_color = vc->vc_color;
1572 vc->vc_saved_G0 = vc->vc_G0_charset;
1573 vc->vc_saved_G1 = vc->vc_G1_charset;
1574 }
1575
1576 /* console_sem is held */
1577 static void restore_cur(struct vc_data *vc)
1578 {
1579 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1580 vc->vc_intensity = vc->vc_s_intensity;
1581 vc->vc_italic = vc->vc_s_italic;
1582 vc->vc_underline = vc->vc_s_underline;
1583 vc->vc_blink = vc->vc_s_blink;
1584 vc->vc_reverse = vc->vc_s_reverse;
1585 vc->vc_charset = vc->vc_s_charset;
1586 vc->vc_color = vc->vc_s_color;
1587 vc->vc_G0_charset = vc->vc_saved_G0;
1588 vc->vc_G1_charset = vc->vc_saved_G1;
1589 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1590 update_attr(vc);
1591 vc->vc_need_wrap = 0;
1592 }
1593
1594 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1595 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1596 ESpalette };
1597
1598 /* console_sem is held (except via vc_init()) */
1599 static void reset_terminal(struct vc_data *vc, int do_clear)
1600 {
1601 vc->vc_top = 0;
1602 vc->vc_bottom = vc->vc_rows;
1603 vc->vc_state = ESnormal;
1604 vc->vc_ques = 0;
1605 vc->vc_translate = set_translate(LAT1_MAP, vc);
1606 vc->vc_G0_charset = LAT1_MAP;
1607 vc->vc_G1_charset = GRAF_MAP;
1608 vc->vc_charset = 0;
1609 vc->vc_need_wrap = 0;
1610 vc->vc_report_mouse = 0;
1611 vc->vc_utf = default_utf8;
1612 vc->vc_utf_count = 0;
1613
1614 vc->vc_disp_ctrl = 0;
1615 vc->vc_toggle_meta = 0;
1616
1617 vc->vc_decscnm = 0;
1618 vc->vc_decom = 0;
1619 vc->vc_decawm = 1;
1620 vc->vc_deccm = 1;
1621 vc->vc_decim = 0;
1622
1623 set_kbd(vc, decarm);
1624 clr_kbd(vc, decckm);
1625 clr_kbd(vc, kbdapplic);
1626 clr_kbd(vc, lnm);
1627 kbd_table[vc->vc_num].lockstate = 0;
1628 kbd_table[vc->vc_num].slockstate = 0;
1629 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1630 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1631 /* do not do set_leds here because this causes an endless tasklet loop
1632 when the keyboard hasn't been initialized yet */
1633
1634 vc->vc_cursor_type = CUR_DEFAULT;
1635 vc->vc_complement_mask = vc->vc_s_complement_mask;
1636
1637 default_attr(vc);
1638 update_attr(vc);
1639
1640 vc->vc_tab_stop[0] = 0x01010100;
1641 vc->vc_tab_stop[1] =
1642 vc->vc_tab_stop[2] =
1643 vc->vc_tab_stop[3] =
1644 vc->vc_tab_stop[4] =
1645 vc->vc_tab_stop[5] =
1646 vc->vc_tab_stop[6] =
1647 vc->vc_tab_stop[7] = 0x01010101;
1648
1649 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1650 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1651
1652 gotoxy(vc, 0, 0);
1653 save_cur(vc);
1654 if (do_clear)
1655 csi_J(vc, 2);
1656 }
1657
1658 /* console_sem is held */
1659 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1660 {
1661 /*
1662 * Control characters can be used in the _middle_
1663 * of an escape sequence.
1664 */
1665 switch (c) {
1666 case 0:
1667 return;
1668 case 7:
1669 if (vc->vc_bell_duration)
1670 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1671 return;
1672 case 8:
1673 bs(vc);
1674 return;
1675 case 9:
1676 vc->vc_pos -= (vc->vc_x << 1);
1677 while (vc->vc_x < vc->vc_cols - 1) {
1678 vc->vc_x++;
1679 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1680 break;
1681 }
1682 vc->vc_pos += (vc->vc_x << 1);
1683 notify_write(vc, '\t');
1684 return;
1685 case 10: case 11: case 12:
1686 lf(vc);
1687 if (!is_kbd(vc, lnm))
1688 return;
1689 case 13:
1690 cr(vc);
1691 return;
1692 case 14:
1693 vc->vc_charset = 1;
1694 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1695 vc->vc_disp_ctrl = 1;
1696 return;
1697 case 15:
1698 vc->vc_charset = 0;
1699 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1700 vc->vc_disp_ctrl = 0;
1701 return;
1702 case 24: case 26:
1703 vc->vc_state = ESnormal;
1704 return;
1705 case 27:
1706 vc->vc_state = ESesc;
1707 return;
1708 case 127:
1709 del(vc);
1710 return;
1711 case 128+27:
1712 vc->vc_state = ESsquare;
1713 return;
1714 }
1715 switch(vc->vc_state) {
1716 case ESesc:
1717 vc->vc_state = ESnormal;
1718 switch (c) {
1719 case '[':
1720 vc->vc_state = ESsquare;
1721 return;
1722 case ']':
1723 vc->vc_state = ESnonstd;
1724 return;
1725 case '%':
1726 vc->vc_state = ESpercent;
1727 return;
1728 case 'E':
1729 cr(vc);
1730 lf(vc);
1731 return;
1732 case 'M':
1733 ri(vc);
1734 return;
1735 case 'D':
1736 lf(vc);
1737 return;
1738 case 'H':
1739 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1740 return;
1741 case 'Z':
1742 respond_ID(tty);
1743 return;
1744 case '7':
1745 save_cur(vc);
1746 return;
1747 case '8':
1748 restore_cur(vc);
1749 return;
1750 case '(':
1751 vc->vc_state = ESsetG0;
1752 return;
1753 case ')':
1754 vc->vc_state = ESsetG1;
1755 return;
1756 case '#':
1757 vc->vc_state = EShash;
1758 return;
1759 case 'c':
1760 reset_terminal(vc, 1);
1761 return;
1762 case '>': /* Numeric keypad */
1763 clr_kbd(vc, kbdapplic);
1764 return;
1765 case '=': /* Appl. keypad */
1766 set_kbd(vc, kbdapplic);
1767 return;
1768 }
1769 return;
1770 case ESnonstd:
1771 if (c=='P') { /* palette escape sequence */
1772 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1773 vc->vc_par[vc->vc_npar] = 0;
1774 vc->vc_npar = 0;
1775 vc->vc_state = ESpalette;
1776 return;
1777 } else if (c=='R') { /* reset palette */
1778 reset_palette(vc);
1779 vc->vc_state = ESnormal;
1780 } else
1781 vc->vc_state = ESnormal;
1782 return;
1783 case ESpalette:
1784 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1785 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1786 if (vc->vc_npar == 7) {
1787 int i = vc->vc_par[0] * 3, j = 1;
1788 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1789 vc->vc_palette[i++] += vc->vc_par[j++];
1790 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1791 vc->vc_palette[i++] += vc->vc_par[j++];
1792 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1793 vc->vc_palette[i] += vc->vc_par[j];
1794 set_palette(vc);
1795 vc->vc_state = ESnormal;
1796 }
1797 } else
1798 vc->vc_state = ESnormal;
1799 return;
1800 case ESsquare:
1801 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1802 vc->vc_par[vc->vc_npar] = 0;
1803 vc->vc_npar = 0;
1804 vc->vc_state = ESgetpars;
1805 if (c == '[') { /* Function key */
1806 vc->vc_state=ESfunckey;
1807 return;
1808 }
1809 vc->vc_ques = (c == '?');
1810 if (vc->vc_ques)
1811 return;
1812 case ESgetpars:
1813 if (c == ';' && vc->vc_npar < NPAR - 1) {
1814 vc->vc_npar++;
1815 return;
1816 } else if (c>='0' && c<='9') {
1817 vc->vc_par[vc->vc_npar] *= 10;
1818 vc->vc_par[vc->vc_npar] += c - '0';
1819 return;
1820 } else
1821 vc->vc_state = ESgotpars;
1822 case ESgotpars:
1823 vc->vc_state = ESnormal;
1824 switch(c) {
1825 case 'h':
1826 set_mode(vc, 1);
1827 return;
1828 case 'l':
1829 set_mode(vc, 0);
1830 return;
1831 case 'c':
1832 if (vc->vc_ques) {
1833 if (vc->vc_par[0])
1834 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1835 else
1836 vc->vc_cursor_type = CUR_DEFAULT;
1837 return;
1838 }
1839 break;
1840 case 'm':
1841 if (vc->vc_ques) {
1842 clear_selection();
1843 if (vc->vc_par[0])
1844 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1845 else
1846 vc->vc_complement_mask = vc->vc_s_complement_mask;
1847 return;
1848 }
1849 break;
1850 case 'n':
1851 if (!vc->vc_ques) {
1852 if (vc->vc_par[0] == 5)
1853 status_report(tty);
1854 else if (vc->vc_par[0] == 6)
1855 cursor_report(vc, tty);
1856 }
1857 return;
1858 }
1859 if (vc->vc_ques) {
1860 vc->vc_ques = 0;
1861 return;
1862 }
1863 switch(c) {
1864 case 'G': case '`':
1865 if (vc->vc_par[0])
1866 vc->vc_par[0]--;
1867 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1868 return;
1869 case 'A':
1870 if (!vc->vc_par[0])
1871 vc->vc_par[0]++;
1872 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1873 return;
1874 case 'B': case 'e':
1875 if (!vc->vc_par[0])
1876 vc->vc_par[0]++;
1877 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1878 return;
1879 case 'C': case 'a':
1880 if (!vc->vc_par[0])
1881 vc->vc_par[0]++;
1882 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1883 return;
1884 case 'D':
1885 if (!vc->vc_par[0])
1886 vc->vc_par[0]++;
1887 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1888 return;
1889 case 'E':
1890 if (!vc->vc_par[0])
1891 vc->vc_par[0]++;
1892 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1893 return;
1894 case 'F':
1895 if (!vc->vc_par[0])
1896 vc->vc_par[0]++;
1897 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1898 return;
1899 case 'd':
1900 if (vc->vc_par[0])
1901 vc->vc_par[0]--;
1902 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1903 return;
1904 case 'H': case 'f':
1905 if (vc->vc_par[0])
1906 vc->vc_par[0]--;
1907 if (vc->vc_par[1])
1908 vc->vc_par[1]--;
1909 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1910 return;
1911 case 'J':
1912 csi_J(vc, vc->vc_par[0]);
1913 return;
1914 case 'K':
1915 csi_K(vc, vc->vc_par[0]);
1916 return;
1917 case 'L':
1918 csi_L(vc, vc->vc_par[0]);
1919 return;
1920 case 'M':
1921 csi_M(vc, vc->vc_par[0]);
1922 return;
1923 case 'P':
1924 csi_P(vc, vc->vc_par[0]);
1925 return;
1926 case 'c':
1927 if (!vc->vc_par[0])
1928 respond_ID(tty);
1929 return;
1930 case 'g':
1931 if (!vc->vc_par[0])
1932 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1933 else if (vc->vc_par[0] == 3) {
1934 vc->vc_tab_stop[0] =
1935 vc->vc_tab_stop[1] =
1936 vc->vc_tab_stop[2] =
1937 vc->vc_tab_stop[3] =
1938 vc->vc_tab_stop[4] =
1939 vc->vc_tab_stop[5] =
1940 vc->vc_tab_stop[6] =
1941 vc->vc_tab_stop[7] = 0;
1942 }
1943 return;
1944 case 'm':
1945 csi_m(vc);
1946 return;
1947 case 'q': /* DECLL - but only 3 leds */
1948 /* map 0,1,2,3 to 0,1,2,4 */
1949 if (vc->vc_par[0] < 4)
1950 setledstate(kbd_table + vc->vc_num,
1951 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1952 return;
1953 case 'r':
1954 if (!vc->vc_par[0])
1955 vc->vc_par[0]++;
1956 if (!vc->vc_par[1])
1957 vc->vc_par[1] = vc->vc_rows;
1958 /* Minimum allowed region is 2 lines */
1959 if (vc->vc_par[0] < vc->vc_par[1] &&
1960 vc->vc_par[1] <= vc->vc_rows) {
1961 vc->vc_top = vc->vc_par[0] - 1;
1962 vc->vc_bottom = vc->vc_par[1];
1963 gotoxay(vc, 0, 0);
1964 }
1965 return;
1966 case 's':
1967 save_cur(vc);
1968 return;
1969 case 'u':
1970 restore_cur(vc);
1971 return;
1972 case 'X':
1973 csi_X(vc, vc->vc_par[0]);
1974 return;
1975 case '@':
1976 csi_at(vc, vc->vc_par[0]);
1977 return;
1978 case ']': /* setterm functions */
1979 setterm_command(vc);
1980 return;
1981 }
1982 return;
1983 case ESpercent:
1984 vc->vc_state = ESnormal;
1985 switch (c) {
1986 case '@': /* defined in ISO 2022 */
1987 vc->vc_utf = 0;
1988 return;
1989 case 'G': /* prelim official escape code */
1990 case '8': /* retained for compatibility */
1991 vc->vc_utf = 1;
1992 return;
1993 }
1994 return;
1995 case ESfunckey:
1996 vc->vc_state = ESnormal;
1997 return;
1998 case EShash:
1999 vc->vc_state = ESnormal;
2000 if (c == '8') {
2001 /* DEC screen alignment test. kludge :-) */
2002 vc->vc_video_erase_char =
2003 (vc->vc_video_erase_char & 0xff00) | 'E';
2004 csi_J(vc, 2);
2005 vc->vc_video_erase_char =
2006 (vc->vc_video_erase_char & 0xff00) | ' ';
2007 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2008 }
2009 return;
2010 case ESsetG0:
2011 if (c == '0')
2012 vc->vc_G0_charset = GRAF_MAP;
2013 else if (c == 'B')
2014 vc->vc_G0_charset = LAT1_MAP;
2015 else if (c == 'U')
2016 vc->vc_G0_charset = IBMPC_MAP;
2017 else if (c == 'K')
2018 vc->vc_G0_charset = USER_MAP;
2019 if (vc->vc_charset == 0)
2020 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2021 vc->vc_state = ESnormal;
2022 return;
2023 case ESsetG1:
2024 if (c == '0')
2025 vc->vc_G1_charset = GRAF_MAP;
2026 else if (c == 'B')
2027 vc->vc_G1_charset = LAT1_MAP;
2028 else if (c == 'U')
2029 vc->vc_G1_charset = IBMPC_MAP;
2030 else if (c == 'K')
2031 vc->vc_G1_charset = USER_MAP;
2032 if (vc->vc_charset == 1)
2033 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2034 vc->vc_state = ESnormal;
2035 return;
2036 default:
2037 vc->vc_state = ESnormal;
2038 }
2039 }
2040
2041 /* This is a temporary buffer used to prepare a tty console write
2042 * so that we can easily avoid touching user space while holding the
2043 * console spinlock. It is allocated in con_init and is shared by
2044 * this code and the vc_screen read/write tty calls.
2045 *
2046 * We have to allocate this statically in the kernel data section
2047 * since console_init (and thus con_init) are called before any
2048 * kernel memory allocation is available.
2049 */
2050 char con_buf[CON_BUF_SIZE];
2051 DEFINE_MUTEX(con_buf_mtx);
2052
2053 /* is_double_width() is based on the wcwidth() implementation by
2054 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2055 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2056 */
2057 struct interval {
2058 uint32_t first;
2059 uint32_t last;
2060 };
2061
2062 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2063 {
2064 int min = 0;
2065 int mid;
2066
2067 if (ucs < table[0].first || ucs > table[max].last)
2068 return 0;
2069 while (max >= min) {
2070 mid = (min + max) / 2;
2071 if (ucs > table[mid].last)
2072 min = mid + 1;
2073 else if (ucs < table[mid].first)
2074 max = mid - 1;
2075 else
2076 return 1;
2077 }
2078 return 0;
2079 }
2080
2081 static int is_double_width(uint32_t ucs)
2082 {
2083 static const struct interval double_width[] = {
2084 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2085 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2086 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2087 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2088 };
2089 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2090 }
2091
2092 /* acquires console_sem */
2093 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2094 {
2095 #ifdef VT_BUF_VRAM_ONLY
2096 #define FLUSH do { } while(0);
2097 #else
2098 #define FLUSH if (draw_x >= 0) { \
2099 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2100 draw_x = -1; \
2101 }
2102 #endif
2103
2104 int c, tc, ok, n = 0, draw_x = -1;
2105 unsigned int currcons;
2106 unsigned long draw_from = 0, draw_to = 0;
2107 struct vc_data *vc;
2108 unsigned char vc_attr;
2109 struct vt_notifier_param param;
2110 uint8_t rescan;
2111 uint8_t inverse;
2112 uint8_t width;
2113 u16 himask, charmask;
2114 const unsigned char *orig_buf = NULL;
2115 int orig_count;
2116
2117 if (in_interrupt())
2118 return count;
2119
2120 might_sleep();
2121
2122 acquire_console_sem();
2123 vc = tty->driver_data;
2124 if (vc == NULL) {
2125 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2126 release_console_sem();
2127 return 0;
2128 }
2129
2130 currcons = vc->vc_num;
2131 if (!vc_cons_allocated(currcons)) {
2132 /* could this happen? */
2133 static int error = 0;
2134 if (!error) {
2135 error = 1;
2136 printk("con_write: tty %d not allocated\n", currcons+1);
2137 }
2138 release_console_sem();
2139 return 0;
2140 }
2141 orig_buf = buf;
2142 orig_count = count;
2143
2144 himask = vc->vc_hi_font_mask;
2145 charmask = himask ? 0x1ff : 0xff;
2146
2147 /* undraw cursor first */
2148 if (IS_FG(vc))
2149 hide_cursor(vc);
2150
2151 param.vc = vc;
2152
2153 while (!tty->stopped && count) {
2154 int orig = *buf;
2155 c = orig;
2156 buf++;
2157 n++;
2158 count--;
2159 rescan = 0;
2160 inverse = 0;
2161 width = 1;
2162
2163 /* Do no translation at all in control states */
2164 if (vc->vc_state != ESnormal) {
2165 tc = c;
2166 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2167 /* Combine UTF-8 into Unicode in vc_utf_char.
2168 * vc_utf_count is the number of continuation bytes still
2169 * expected to arrive.
2170 * vc_npar is the number of continuation bytes arrived so
2171 * far
2172 */
2173 rescan_last_byte:
2174 if ((c & 0xc0) == 0x80) {
2175 /* Continuation byte received */
2176 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2177 if (vc->vc_utf_count) {
2178 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2179 vc->vc_npar++;
2180 if (--vc->vc_utf_count) {
2181 /* Still need some bytes */
2182 continue;
2183 }
2184 /* Got a whole character */
2185 c = vc->vc_utf_char;
2186 /* Reject overlong sequences */
2187 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2188 c > utf8_length_changes[vc->vc_npar])
2189 c = 0xfffd;
2190 } else {
2191 /* Unexpected continuation byte */
2192 vc->vc_utf_count = 0;
2193 c = 0xfffd;
2194 }
2195 } else {
2196 /* Single ASCII byte or first byte of a sequence received */
2197 if (vc->vc_utf_count) {
2198 /* Continuation byte expected */
2199 rescan = 1;
2200 vc->vc_utf_count = 0;
2201 c = 0xfffd;
2202 } else if (c > 0x7f) {
2203 /* First byte of a multibyte sequence received */
2204 vc->vc_npar = 0;
2205 if ((c & 0xe0) == 0xc0) {
2206 vc->vc_utf_count = 1;
2207 vc->vc_utf_char = (c & 0x1f);
2208 } else if ((c & 0xf0) == 0xe0) {
2209 vc->vc_utf_count = 2;
2210 vc->vc_utf_char = (c & 0x0f);
2211 } else if ((c & 0xf8) == 0xf0) {
2212 vc->vc_utf_count = 3;
2213 vc->vc_utf_char = (c & 0x07);
2214 } else if ((c & 0xfc) == 0xf8) {
2215 vc->vc_utf_count = 4;
2216 vc->vc_utf_char = (c & 0x03);
2217 } else if ((c & 0xfe) == 0xfc) {
2218 vc->vc_utf_count = 5;
2219 vc->vc_utf_char = (c & 0x01);
2220 } else {
2221 /* 254 and 255 are invalid */
2222 c = 0xfffd;
2223 }
2224 if (vc->vc_utf_count) {
2225 /* Still need some bytes */
2226 continue;
2227 }
2228 }
2229 /* Nothing to do if an ASCII byte was received */
2230 }
2231 /* End of UTF-8 decoding. */
2232 /* c is the received character, or U+FFFD for invalid sequences. */
2233 /* Replace invalid Unicode code points with U+FFFD too */
2234 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2235 c = 0xfffd;
2236 tc = c;
2237 } else { /* no utf or alternate charset mode */
2238 tc = vc_translate(vc, c);
2239 }
2240
2241 param.c = tc;
2242 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2243 &param) == NOTIFY_STOP)
2244 continue;
2245
2246 /* If the original code was a control character we
2247 * only allow a glyph to be displayed if the code is
2248 * not normally used (such as for cursor movement) or
2249 * if the disp_ctrl mode has been explicitly enabled.
2250 * Certain characters (as given by the CTRL_ALWAYS
2251 * bitmap) are always displayed as control characters,
2252 * as the console would be pretty useless without
2253 * them; to display an arbitrary font position use the
2254 * direct-to-font zone in UTF-8 mode.
2255 */
2256 ok = tc && (c >= 32 ||
2257 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2258 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2259 && (c != 127 || vc->vc_disp_ctrl)
2260 && (c != 128+27);
2261
2262 if (vc->vc_state == ESnormal && ok) {
2263 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2264 if (is_double_width(c))
2265 width = 2;
2266 }
2267 /* Now try to find out how to display it */
2268 tc = conv_uni_to_pc(vc, tc);
2269 if (tc & ~charmask) {
2270 if (tc == -1 || tc == -2) {
2271 continue; /* nothing to display */
2272 }
2273 /* Glyph not found */
2274 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2275 /* In legacy mode use the glyph we get by a 1:1 mapping.
2276 This would make absolutely no sense with Unicode in mind,
2277 but do this for ASCII characters since a font may lack
2278 Unicode mapping info and we don't want to end up with
2279 having question marks only. */
2280 tc = c;
2281 } else {
2282 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2283 tc = conv_uni_to_pc(vc, 0xfffd);
2284 if (tc < 0) {
2285 inverse = 1;
2286 tc = conv_uni_to_pc(vc, '?');
2287 if (tc < 0) tc = '?';
2288 }
2289 }
2290 }
2291
2292 if (!inverse) {
2293 vc_attr = vc->vc_attr;
2294 } else {
2295 /* invert vc_attr */
2296 if (!vc->vc_can_do_color) {
2297 vc_attr = (vc->vc_attr) ^ 0x08;
2298 } else if (vc->vc_hi_font_mask == 0x100) {
2299 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2300 } else {
2301 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2302 }
2303 FLUSH
2304 }
2305
2306 while (1) {
2307 if (vc->vc_need_wrap || vc->vc_decim)
2308 FLUSH
2309 if (vc->vc_need_wrap) {
2310 cr(vc);
2311 lf(vc);
2312 }
2313 if (vc->vc_decim)
2314 insert_char(vc, 1);
2315 scr_writew(himask ?
2316 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2317 (vc_attr << 8) + tc,
2318 (u16 *) vc->vc_pos);
2319 if (DO_UPDATE(vc) && draw_x < 0) {
2320 draw_x = vc->vc_x;
2321 draw_from = vc->vc_pos;
2322 }
2323 if (vc->vc_x == vc->vc_cols - 1) {
2324 vc->vc_need_wrap = vc->vc_decawm;
2325 draw_to = vc->vc_pos + 2;
2326 } else {
2327 vc->vc_x++;
2328 draw_to = (vc->vc_pos += 2);
2329 }
2330
2331 if (!--width) break;
2332
2333 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2334 if (tc < 0) tc = ' ';
2335 }
2336 notify_write(vc, c);
2337
2338 if (inverse) {
2339 FLUSH
2340 }
2341
2342 if (rescan) {
2343 rescan = 0;
2344 inverse = 0;
2345 width = 1;
2346 c = orig;
2347 goto rescan_last_byte;
2348 }
2349 continue;
2350 }
2351 FLUSH
2352 do_con_trol(tty, vc, orig);
2353 }
2354 FLUSH
2355 console_conditional_schedule();
2356 release_console_sem();
2357 notify_update(vc);
2358 return n;
2359 #undef FLUSH
2360 }
2361
2362 /*
2363 * This is the console switching callback.
2364 *
2365 * Doing console switching in a process context allows
2366 * us to do the switches asynchronously (needed when we want
2367 * to switch due to a keyboard interrupt). Synchronization
2368 * with other console code and prevention of re-entrancy is
2369 * ensured with console_sem.
2370 */
2371 static void console_callback(struct work_struct *ignored)
2372 {
2373 acquire_console_sem();
2374
2375 if (want_console >= 0) {
2376 if (want_console != fg_console &&
2377 vc_cons_allocated(want_console)) {
2378 hide_cursor(vc_cons[fg_console].d);
2379 change_console(vc_cons[want_console].d);
2380 /* we only changed when the console had already
2381 been allocated - a new console is not created
2382 in an interrupt routine */
2383 }
2384 want_console = -1;
2385 }
2386 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2387 do_poke_blanked_console = 0;
2388 poke_blanked_console();
2389 }
2390 if (scrollback_delta) {
2391 struct vc_data *vc = vc_cons[fg_console].d;
2392 clear_selection();
2393 if (vc->vc_mode == KD_TEXT)
2394 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2395 scrollback_delta = 0;
2396 }
2397 if (blank_timer_expired) {
2398 do_blank_screen(0);
2399 blank_timer_expired = 0;
2400 }
2401 notify_update(vc_cons[fg_console].d);
2402
2403 release_console_sem();
2404 }
2405
2406 int set_console(int nr)
2407 {
2408 struct vc_data *vc = vc_cons[fg_console].d;
2409
2410 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2411 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2412
2413 /*
2414 * Console switch will fail in console_callback() or
2415 * change_console() so there is no point scheduling
2416 * the callback
2417 *
2418 * Existing set_console() users don't check the return
2419 * value so this shouldn't break anything
2420 */
2421 return -EINVAL;
2422 }
2423
2424 want_console = nr;
2425 schedule_console_callback();
2426
2427 return 0;
2428 }
2429
2430 struct tty_driver *console_driver;
2431
2432 #ifdef CONFIG_VT_CONSOLE
2433
2434 /*
2435 * Console on virtual terminal
2436 *
2437 * The console must be locked when we get here.
2438 */
2439
2440 static void vt_console_print(struct console *co, const char *b, unsigned count)
2441 {
2442 struct vc_data *vc = vc_cons[fg_console].d;
2443 unsigned char c;
2444 static DEFINE_SPINLOCK(printing_lock);
2445 const ushort *start;
2446 ushort cnt = 0;
2447 ushort myx;
2448
2449 /* console busy or not yet initialized */
2450 if (!printable)
2451 return;
2452 if (!spin_trylock(&printing_lock))
2453 return;
2454
2455 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2456 vc = vc_cons[kmsg_redirect - 1].d;
2457
2458 /* read `x' only after setting currcons properly (otherwise
2459 the `x' macro will read the x of the foreground console). */
2460 myx = vc->vc_x;
2461
2462 if (!vc_cons_allocated(fg_console)) {
2463 /* impossible */
2464 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2465 goto quit;
2466 }
2467
2468 if (vc->vc_mode != KD_TEXT)
2469 goto quit;
2470
2471 /* undraw cursor first */
2472 if (IS_FG(vc))
2473 hide_cursor(vc);
2474
2475 start = (ushort *)vc->vc_pos;
2476
2477 /* Contrived structure to try to emulate original need_wrap behaviour
2478 * Problems caused when we have need_wrap set on '\n' character */
2479 while (count--) {
2480 c = *b++;
2481 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2482 if (cnt > 0) {
2483 if (CON_IS_VISIBLE(vc))
2484 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2485 vc->vc_x += cnt;
2486 if (vc->vc_need_wrap)
2487 vc->vc_x--;
2488 cnt = 0;
2489 }
2490 if (c == 8) { /* backspace */
2491 bs(vc);
2492 start = (ushort *)vc->vc_pos;
2493 myx = vc->vc_x;
2494 continue;
2495 }
2496 if (c != 13)
2497 lf(vc);
2498 cr(vc);
2499 start = (ushort *)vc->vc_pos;
2500 myx = vc->vc_x;
2501 if (c == 10 || c == 13)
2502 continue;
2503 }
2504 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2505 notify_write(vc, c);
2506 cnt++;
2507 if (myx == vc->vc_cols - 1) {
2508 vc->vc_need_wrap = 1;
2509 continue;
2510 }
2511 vc->vc_pos += 2;
2512 myx++;
2513 }
2514 if (cnt > 0) {
2515 if (CON_IS_VISIBLE(vc))
2516 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2517 vc->vc_x += cnt;
2518 if (vc->vc_x == vc->vc_cols) {
2519 vc->vc_x--;
2520 vc->vc_need_wrap = 1;
2521 }
2522 }
2523 set_cursor(vc);
2524 notify_update(vc);
2525
2526 quit:
2527 spin_unlock(&printing_lock);
2528 }
2529
2530 static struct tty_driver *vt_console_device(struct console *c, int *index)
2531 {
2532 *index = c->index ? c->index-1 : fg_console;
2533 return console_driver;
2534 }
2535
2536 static struct console vt_console_driver = {
2537 .name = "tty",
2538 .write = vt_console_print,
2539 .device = vt_console_device,
2540 .unblank = unblank_screen,
2541 .flags = CON_PRINTBUFFER,
2542 .index = -1,
2543 };
2544 #endif
2545
2546 /*
2547 * Handling of Linux-specific VC ioctls
2548 */
2549
2550 /*
2551 * Generally a bit racy with respect to console_sem().
2552 *
2553 * There are some functions which don't need it.
2554 *
2555 * There are some functions which can sleep for arbitrary periods
2556 * (paste_selection) but we don't need the lock there anyway.
2557 *
2558 * set_selection has locking, and definitely needs it
2559 */
2560
2561 int tioclinux(struct tty_struct *tty, unsigned long arg)
2562 {
2563 char type, data;
2564 char __user *p = (char __user *)arg;
2565 int lines;
2566 int ret;
2567
2568 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2569 return -EPERM;
2570 if (get_user(type, p))
2571 return -EFAULT;
2572 ret = 0;
2573
2574 lock_kernel();
2575
2576 switch (type)
2577 {
2578 case TIOCL_SETSEL:
2579 acquire_console_sem();
2580 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2581 release_console_sem();
2582 break;
2583 case TIOCL_PASTESEL:
2584 ret = paste_selection(tty);
2585 break;
2586 case TIOCL_UNBLANKSCREEN:
2587 acquire_console_sem();
2588 unblank_screen();
2589 release_console_sem();
2590 break;
2591 case TIOCL_SELLOADLUT:
2592 ret = sel_loadlut(p);
2593 break;
2594 case TIOCL_GETSHIFTSTATE:
2595
2596 /*
2597 * Make it possible to react to Shift+Mousebutton.
2598 * Note that 'shift_state' is an undocumented
2599 * kernel-internal variable; programs not closely
2600 * related to the kernel should not use this.
2601 */
2602 data = shift_state;
2603 ret = __put_user(data, p);
2604 break;
2605 case TIOCL_GETMOUSEREPORTING:
2606 data = mouse_reporting();
2607 ret = __put_user(data, p);
2608 break;
2609 case TIOCL_SETVESABLANK:
2610 ret = set_vesa_blanking(p);
2611 break;
2612 case TIOCL_GETKMSGREDIRECT:
2613 data = kmsg_redirect;
2614 ret = __put_user(data, p);
2615 break;
2616 case TIOCL_SETKMSGREDIRECT:
2617 if (!capable(CAP_SYS_ADMIN)) {
2618 ret = -EPERM;
2619 } else {
2620 if (get_user(data, p+1))
2621 ret = -EFAULT;
2622 else
2623 kmsg_redirect = data;
2624 }
2625 break;
2626 case TIOCL_GETFGCONSOLE:
2627 ret = fg_console;
2628 break;
2629 case TIOCL_SCROLLCONSOLE:
2630 if (get_user(lines, (s32 __user *)(p+4))) {
2631 ret = -EFAULT;
2632 } else {
2633 scrollfront(vc_cons[fg_console].d, lines);
2634 ret = 0;
2635 }
2636 break;
2637 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2638 acquire_console_sem();
2639 ignore_poke = 1;
2640 do_blank_screen(0);
2641 release_console_sem();
2642 break;
2643 case TIOCL_BLANKEDSCREEN:
2644 ret = console_blanked;
2645 break;
2646 default:
2647 ret = -EINVAL;
2648 break;
2649 }
2650 unlock_kernel();
2651 return ret;
2652 }
2653
2654 /*
2655 * /dev/ttyN handling
2656 */
2657
2658 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2659 {
2660 int retval;
2661
2662 retval = do_con_write(tty, buf, count);
2663 con_flush_chars(tty);
2664
2665 return retval;
2666 }
2667
2668 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2669 {
2670 if (in_interrupt())
2671 return 0; /* n_r3964 calls put_char() from interrupt context */
2672 return do_con_write(tty, &ch, 1);
2673 }
2674
2675 static int con_write_room(struct tty_struct *tty)
2676 {
2677 if (tty->stopped)
2678 return 0;
2679 return 32768; /* No limit, really; we're not buffering */
2680 }
2681
2682 static int con_chars_in_buffer(struct tty_struct *tty)
2683 {
2684 return 0; /* we're not buffering */
2685 }
2686
2687 /*
2688 * con_throttle and con_unthrottle are only used for
2689 * paste_selection(), which has to stuff in a large number of
2690 * characters...
2691 */
2692 static void con_throttle(struct tty_struct *tty)
2693 {
2694 }
2695
2696 static void con_unthrottle(struct tty_struct *tty)
2697 {
2698 struct vc_data *vc = tty->driver_data;
2699
2700 wake_up_interruptible(&vc->paste_wait);
2701 }
2702
2703 /*
2704 * Turn the Scroll-Lock LED on when the tty is stopped
2705 */
2706 static void con_stop(struct tty_struct *tty)
2707 {
2708 int console_num;
2709 if (!tty)
2710 return;
2711 console_num = tty->index;
2712 if (!vc_cons_allocated(console_num))
2713 return;
2714 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2715 set_leds();
2716 }
2717
2718 /*
2719 * Turn the Scroll-Lock LED off when the console is started
2720 */
2721 static void con_start(struct tty_struct *tty)
2722 {
2723 int console_num;
2724 if (!tty)
2725 return;
2726 console_num = tty->index;
2727 if (!vc_cons_allocated(console_num))
2728 return;
2729 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2730 set_leds();
2731 }
2732
2733 static void con_flush_chars(struct tty_struct *tty)
2734 {
2735 struct vc_data *vc;
2736
2737 if (in_interrupt()) /* from flush_to_ldisc */
2738 return;
2739
2740 /* if we race with con_close(), vt may be null */
2741 acquire_console_sem();
2742 vc = tty->driver_data;
2743 if (vc)
2744 set_cursor(vc);
2745 release_console_sem();
2746 }
2747
2748 /*
2749 * Allocate the console screen memory.
2750 */
2751 static int con_open(struct tty_struct *tty, struct file *filp)
2752 {
2753 unsigned int currcons = tty->index;
2754 int ret = 0;
2755
2756 acquire_console_sem();
2757 if (tty->driver_data == NULL) {
2758 ret = vc_allocate(currcons);
2759 if (ret == 0) {
2760 struct vc_data *vc = vc_cons[currcons].d;
2761
2762 /* Still being freed */
2763 if (vc->vc_tty) {
2764 release_console_sem();
2765 return -ERESTARTSYS;
2766 }
2767 tty->driver_data = vc;
2768 vc->vc_tty = tty;
2769
2770 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2771 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2772 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2773 }
2774 if (vc->vc_utf)
2775 tty->termios->c_iflag |= IUTF8;
2776 else
2777 tty->termios->c_iflag &= ~IUTF8;
2778 vcs_make_sysfs(tty);
2779 release_console_sem();
2780 return ret;
2781 }
2782 }
2783 release_console_sem();
2784 return ret;
2785 }
2786
2787 static void con_close(struct tty_struct *tty, struct file *filp)
2788 {
2789 /* Nothing to do - we defer to shutdown */
2790 }
2791
2792 static void con_shutdown(struct tty_struct *tty)
2793 {
2794 struct vc_data *vc = tty->driver_data;
2795 BUG_ON(vc == NULL);
2796 acquire_console_sem();
2797 vc->vc_tty = NULL;
2798 vcs_remove_sysfs(tty);
2799 release_console_sem();
2800 tty_shutdown(tty);
2801 }
2802
2803 static int default_italic_color = 2; // green (ASCII)
2804 static int default_underline_color = 3; // cyan (ASCII)
2805 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2806 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2807
2808 static void vc_init(struct vc_data *vc, unsigned int rows,
2809 unsigned int cols, int do_clear)
2810 {
2811 int j, k ;
2812
2813 vc->vc_cols = cols;
2814 vc->vc_rows = rows;
2815 vc->vc_size_row = cols << 1;
2816 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2817
2818 set_origin(vc);
2819 vc->vc_pos = vc->vc_origin;
2820 reset_vc(vc);
2821 for (j=k=0; j<16; j++) {
2822 vc->vc_palette[k++] = default_red[j] ;
2823 vc->vc_palette[k++] = default_grn[j] ;
2824 vc->vc_palette[k++] = default_blu[j] ;
2825 }
2826 vc->vc_def_color = 0x07; /* white */
2827 vc->vc_ulcolor = default_underline_color;
2828 vc->vc_itcolor = default_italic_color;
2829 vc->vc_halfcolor = 0x08; /* grey */
2830 init_waitqueue_head(&vc->paste_wait);
2831 reset_terminal(vc, do_clear);
2832 }
2833
2834 /*
2835 * This routine initializes console interrupts, and does nothing
2836 * else. If you want the screen to clear, call tty_write with
2837 * the appropriate escape-sequence.
2838 */
2839
2840 static int __init con_init(void)
2841 {
2842 const char *display_desc = NULL;
2843 struct vc_data *vc;
2844 unsigned int currcons = 0, i;
2845
2846 acquire_console_sem();
2847
2848 if (conswitchp)
2849 display_desc = conswitchp->con_startup();
2850 if (!display_desc) {
2851 fg_console = 0;
2852 release_console_sem();
2853 return 0;
2854 }
2855
2856 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2857 struct con_driver *con_driver = &registered_con_driver[i];
2858
2859 if (con_driver->con == NULL) {
2860 con_driver->con = conswitchp;
2861 con_driver->desc = display_desc;
2862 con_driver->flag = CON_DRIVER_FLAG_INIT;
2863 con_driver->first = 0;
2864 con_driver->last = MAX_NR_CONSOLES - 1;
2865 break;
2866 }
2867 }
2868
2869 for (i = 0; i < MAX_NR_CONSOLES; i++)
2870 con_driver_map[i] = conswitchp;
2871
2872 if (blankinterval) {
2873 blank_state = blank_normal_wait;
2874 mod_timer(&console_timer, jiffies + blankinterval);
2875 }
2876
2877 /*
2878 * kmalloc is not running yet - we use the bootmem allocator.
2879 */
2880 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2881 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2882 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2883 visual_init(vc, currcons, 1);
2884 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2885 vc->vc_kmalloced = 0;
2886 vc_init(vc, vc->vc_rows, vc->vc_cols,
2887 currcons || !vc->vc_sw->con_save_screen);
2888 }
2889 currcons = fg_console = 0;
2890 master_display_fg = vc = vc_cons[currcons].d;
2891 set_origin(vc);
2892 save_screen(vc);
2893 gotoxy(vc, vc->vc_x, vc->vc_y);
2894 csi_J(vc, 0);
2895 update_screen(vc);
2896 printk("Console: %s %s %dx%d",
2897 vc->vc_can_do_color ? "colour" : "mono",
2898 display_desc, vc->vc_cols, vc->vc_rows);
2899 printable = 1;
2900 printk("\n");
2901
2902 release_console_sem();
2903
2904 #ifdef CONFIG_VT_CONSOLE
2905 register_console(&vt_console_driver);
2906 #endif
2907 return 0;
2908 }
2909 console_initcall(con_init);
2910
2911 static const struct tty_operations con_ops = {
2912 .open = con_open,
2913 .close = con_close,
2914 .write = con_write,
2915 .write_room = con_write_room,
2916 .put_char = con_put_char,
2917 .flush_chars = con_flush_chars,
2918 .chars_in_buffer = con_chars_in_buffer,
2919 .ioctl = vt_ioctl,
2920 .stop = con_stop,
2921 .start = con_start,
2922 .throttle = con_throttle,
2923 .unthrottle = con_unthrottle,
2924 .resize = vt_resize,
2925 .shutdown = con_shutdown
2926 };
2927
2928 static struct cdev vc0_cdev;
2929
2930 int __init vty_init(const struct file_operations *console_fops)
2931 {
2932 cdev_init(&vc0_cdev, console_fops);
2933 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2934 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2935 panic("Couldn't register /dev/tty0 driver\n");
2936 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2937
2938 vcs_init();
2939
2940 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2941 if (!console_driver)
2942 panic("Couldn't allocate console driver\n");
2943 console_driver->owner = THIS_MODULE;
2944 console_driver->name = "tty";
2945 console_driver->name_base = 1;
2946 console_driver->major = TTY_MAJOR;
2947 console_driver->minor_start = 1;
2948 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2949 console_driver->init_termios = tty_std_termios;
2950 if (default_utf8)
2951 console_driver->init_termios.c_iflag |= IUTF8;
2952 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2953 tty_set_operations(console_driver, &con_ops);
2954 if (tty_register_driver(console_driver))
2955 panic("Couldn't register console driver\n");
2956 kbd_init();
2957 console_map_init();
2958 #ifdef CONFIG_PROM_CONSOLE
2959 prom_con_init();
2960 #endif
2961 #ifdef CONFIG_MDA_CONSOLE
2962 mda_console_init();
2963 #endif
2964 return 0;
2965 }
2966
2967 #ifndef VT_SINGLE_DRIVER
2968 #include <linux/device.h>
2969
2970 static struct class *vtconsole_class;
2971
2972 static int bind_con_driver(const struct consw *csw, int first, int last,
2973 int deflt)
2974 {
2975 struct module *owner = csw->owner;
2976 const char *desc = NULL;
2977 struct con_driver *con_driver;
2978 int i, j = -1, k = -1, retval = -ENODEV;
2979
2980 if (!try_module_get(owner))
2981 return -ENODEV;
2982
2983 acquire_console_sem();
2984
2985 /* check if driver is registered */
2986 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2987 con_driver = &registered_con_driver[i];
2988
2989 if (con_driver->con == csw) {
2990 desc = con_driver->desc;
2991 retval = 0;
2992 break;
2993 }
2994 }
2995
2996 if (retval)
2997 goto err;
2998
2999 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3000 csw->con_startup();
3001 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3002 }
3003
3004 if (deflt) {
3005 if (conswitchp)
3006 module_put(conswitchp->owner);
3007
3008 __module_get(owner);
3009 conswitchp = csw;
3010 }
3011
3012 first = max(first, con_driver->first);
3013 last = min(last, con_driver->last);
3014
3015 for (i = first; i <= last; i++) {
3016 int old_was_color;
3017 struct vc_data *vc = vc_cons[i].d;
3018
3019 if (con_driver_map[i])
3020 module_put(con_driver_map[i]->owner);
3021 __module_get(owner);
3022 con_driver_map[i] = csw;
3023
3024 if (!vc || !vc->vc_sw)
3025 continue;
3026
3027 j = i;
3028
3029 if (CON_IS_VISIBLE(vc)) {
3030 k = i;
3031 save_screen(vc);
3032 }
3033
3034 old_was_color = vc->vc_can_do_color;
3035 vc->vc_sw->con_deinit(vc);
3036 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3037 visual_init(vc, i, 0);
3038 set_origin(vc);
3039 update_attr(vc);
3040
3041 /* If the console changed between mono <-> color, then
3042 * the attributes in the screenbuf will be wrong. The
3043 * following resets all attributes to something sane.
3044 */
3045 if (old_was_color != vc->vc_can_do_color)
3046 clear_buffer_attributes(vc);
3047 }
3048
3049 printk("Console: switching ");
3050 if (!deflt)
3051 printk("consoles %d-%d ", first+1, last+1);
3052 if (j >= 0) {
3053 struct vc_data *vc = vc_cons[j].d;
3054
3055 printk("to %s %s %dx%d\n",
3056 vc->vc_can_do_color ? "colour" : "mono",
3057 desc, vc->vc_cols, vc->vc_rows);
3058
3059 if (k >= 0) {
3060 vc = vc_cons[k].d;
3061 update_screen(vc);
3062 }
3063 } else
3064 printk("to %s\n", desc);
3065
3066 retval = 0;
3067 err:
3068 release_console_sem();
3069 module_put(owner);
3070 return retval;
3071 };
3072
3073 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3074 static int con_is_graphics(const struct consw *csw, int first, int last)
3075 {
3076 int i, retval = 0;
3077
3078 for (i = first; i <= last; i++) {
3079 struct vc_data *vc = vc_cons[i].d;
3080
3081 if (vc && vc->vc_mode == KD_GRAPHICS) {
3082 retval = 1;
3083 break;
3084 }
3085 }
3086
3087 return retval;
3088 }
3089
3090 /**
3091 * unbind_con_driver - unbind a console driver
3092 * @csw: pointer to console driver to unregister
3093 * @first: first in range of consoles that @csw should be unbound from
3094 * @last: last in range of consoles that @csw should be unbound from
3095 * @deflt: should next bound console driver be default after @csw is unbound?
3096 *
3097 * To unbind a driver from all possible consoles, pass 0 as @first and
3098 * %MAX_NR_CONSOLES as @last.
3099 *
3100 * @deflt controls whether the console that ends up replacing @csw should be
3101 * the default console.
3102 *
3103 * RETURNS:
3104 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3105 * or 0 on success.
3106 */
3107 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3108 {
3109 struct module *owner = csw->owner;
3110 const struct consw *defcsw = NULL;
3111 struct con_driver *con_driver = NULL, *con_back = NULL;
3112 int i, retval = -ENODEV;
3113
3114 if (!try_module_get(owner))
3115 return -ENODEV;
3116
3117 acquire_console_sem();
3118
3119 /* check if driver is registered and if it is unbindable */
3120 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3121 con_driver = &registered_con_driver[i];
3122
3123 if (con_driver->con == csw &&
3124 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3125 retval = 0;
3126 break;
3127 }
3128 }
3129
3130 if (retval) {
3131 release_console_sem();
3132 goto err;
3133 }
3134
3135 retval = -ENODEV;
3136
3137 /* check if backup driver exists */
3138 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3139 con_back = &registered_con_driver[i];
3140
3141 if (con_back->con &&
3142 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3143 defcsw = con_back->con;
3144 retval = 0;
3145 break;
3146 }
3147 }
3148
3149 if (retval) {
3150 release_console_sem();
3151 goto err;
3152 }
3153
3154 if (!con_is_bound(csw)) {
3155 release_console_sem();
3156 goto err;
3157 }
3158
3159 first = max(first, con_driver->first);
3160 last = min(last, con_driver->last);
3161
3162 for (i = first; i <= last; i++) {
3163 if (con_driver_map[i] == csw) {
3164 module_put(csw->owner);
3165 con_driver_map[i] = NULL;
3166 }
3167 }
3168
3169 if (!con_is_bound(defcsw)) {
3170 const struct consw *defconsw = conswitchp;
3171
3172 defcsw->con_startup();
3173 con_back->flag |= CON_DRIVER_FLAG_INIT;
3174 /*
3175 * vgacon may change the default driver to point
3176 * to dummycon, we restore it here...
3177 */
3178 conswitchp = defconsw;
3179 }
3180
3181 if (!con_is_bound(csw))
3182 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3183
3184 release_console_sem();
3185 /* ignore return value, binding should not fail */
3186 bind_con_driver(defcsw, first, last, deflt);
3187 err:
3188 module_put(owner);
3189 return retval;
3190
3191 }
3192 EXPORT_SYMBOL(unbind_con_driver);
3193
3194 static int vt_bind(struct con_driver *con)
3195 {
3196 const struct consw *defcsw = NULL, *csw = NULL;
3197 int i, more = 1, first = -1, last = -1, deflt = 0;
3198
3199 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3200 con_is_graphics(con->con, con->first, con->last))
3201 goto err;
3202
3203 csw = con->con;
3204
3205 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3206 struct con_driver *con = &registered_con_driver[i];
3207
3208 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3209 defcsw = con->con;
3210 break;
3211 }
3212 }
3213
3214 if (!defcsw)
3215 goto err;
3216
3217 while (more) {
3218 more = 0;
3219
3220 for (i = con->first; i <= con->last; i++) {
3221 if (con_driver_map[i] == defcsw) {
3222 if (first == -1)
3223 first = i;
3224 last = i;
3225 more = 1;
3226 } else if (first != -1)
3227 break;
3228 }
3229
3230 if (first == 0 && last == MAX_NR_CONSOLES -1)
3231 deflt = 1;
3232
3233 if (first != -1)
3234 bind_con_driver(csw, first, last, deflt);
3235
3236 first = -1;
3237 last = -1;
3238 deflt = 0;
3239 }
3240
3241 err:
3242 return 0;
3243 }
3244
3245 static int vt_unbind(struct con_driver *con)
3246 {
3247 const struct consw *csw = NULL;
3248 int i, more = 1, first = -1, last = -1, deflt = 0;
3249
3250 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3251 con_is_graphics(con->con, con->first, con->last))
3252 goto err;
3253
3254 csw = con->con;
3255
3256 while (more) {
3257 more = 0;
3258
3259 for (i = con->first; i <= con->last; i++) {
3260 if (con_driver_map[i] == csw) {
3261 if (first == -1)
3262 first = i;
3263 last = i;
3264 more = 1;
3265 } else if (first != -1)
3266 break;
3267 }
3268
3269 if (first == 0 && last == MAX_NR_CONSOLES -1)
3270 deflt = 1;
3271
3272 if (first != -1)
3273 unbind_con_driver(csw, first, last, deflt);
3274
3275 first = -1;
3276 last = -1;
3277 deflt = 0;
3278 }
3279
3280 err:
3281 return 0;
3282 }
3283 #else
3284 static inline int vt_bind(struct con_driver *con)
3285 {
3286 return 0;
3287 }
3288 static inline int vt_unbind(struct con_driver *con)
3289 {
3290 return 0;
3291 }
3292 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3293
3294 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3295 const char *buf, size_t count)
3296 {
3297 struct con_driver *con = dev_get_drvdata(dev);
3298 int bind = simple_strtoul(buf, NULL, 0);
3299
3300 if (bind)
3301 vt_bind(con);
3302 else
3303 vt_unbind(con);
3304
3305 return count;
3306 }
3307
3308 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3309 char *buf)
3310 {
3311 struct con_driver *con = dev_get_drvdata(dev);
3312 int bind = con_is_bound(con->con);
3313
3314 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3315 }
3316
3317 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3318 char *buf)
3319 {
3320 struct con_driver *con = dev_get_drvdata(dev);
3321
3322 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3323 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3324 con->desc);
3325
3326 }
3327
3328 static struct device_attribute device_attrs[] = {
3329 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3330 __ATTR(name, S_IRUGO, show_name, NULL),
3331 };
3332
3333 static int vtconsole_init_device(struct con_driver *con)
3334 {
3335 int i;
3336 int error = 0;
3337
3338 con->flag |= CON_DRIVER_FLAG_ATTR;
3339 dev_set_drvdata(con->dev, con);
3340 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3341 error = device_create_file(con->dev, &device_attrs[i]);
3342 if (error)
3343 break;
3344 }
3345
3346 if (error) {
3347 while (--i >= 0)
3348 device_remove_file(con->dev, &device_attrs[i]);
3349 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3350 }
3351
3352 return error;
3353 }
3354
3355 static void vtconsole_deinit_device(struct con_driver *con)
3356 {
3357 int i;
3358
3359 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3360 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3361 device_remove_file(con->dev, &device_attrs[i]);
3362 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3363 }
3364 }
3365
3366 /**
3367 * con_is_bound - checks if driver is bound to the console
3368 * @csw: console driver
3369 *
3370 * RETURNS: zero if unbound, nonzero if bound
3371 *
3372 * Drivers can call this and if zero, they should release
3373 * all resources allocated on con_startup()
3374 */
3375 int con_is_bound(const struct consw *csw)
3376 {
3377 int i, bound = 0;
3378
3379 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3380 if (con_driver_map[i] == csw) {
3381 bound = 1;
3382 break;
3383 }
3384 }
3385
3386 return bound;
3387 }
3388 EXPORT_SYMBOL(con_is_bound);
3389
3390 /**
3391 * register_con_driver - register console driver to console layer
3392 * @csw: console driver
3393 * @first: the first console to take over, minimum value is 0
3394 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3395 *
3396 * DESCRIPTION: This function registers a console driver which can later
3397 * bind to a range of consoles specified by @first and @last. It will
3398 * also initialize the console driver by calling con_startup().
3399 */
3400 int register_con_driver(const struct consw *csw, int first, int last)
3401 {
3402 struct module *owner = csw->owner;
3403 struct con_driver *con_driver;
3404 const char *desc;
3405 int i, retval = 0;
3406
3407 if (!try_module_get(owner))
3408 return -ENODEV;
3409
3410 acquire_console_sem();
3411
3412 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3413 con_driver = &registered_con_driver[i];
3414
3415 /* already registered */
3416 if (con_driver->con == csw)
3417 retval = -EINVAL;
3418 }
3419
3420 if (retval)
3421 goto err;
3422
3423 desc = csw->con_startup();
3424
3425 if (!desc)
3426 goto err;
3427
3428 retval = -EINVAL;
3429
3430 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3431 con_driver = &registered_con_driver[i];
3432
3433 if (con_driver->con == NULL) {
3434 con_driver->con = csw;
3435 con_driver->desc = desc;
3436 con_driver->node = i;
3437 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3438 CON_DRIVER_FLAG_INIT;
3439 con_driver->first = first;
3440 con_driver->last = last;
3441 retval = 0;
3442 break;
3443 }
3444 }
3445
3446 if (retval)
3447 goto err;
3448
3449 con_driver->dev = device_create(vtconsole_class, NULL,
3450 MKDEV(0, con_driver->node),
3451 NULL, "vtcon%i",
3452 con_driver->node);
3453
3454 if (IS_ERR(con_driver->dev)) {
3455 printk(KERN_WARNING "Unable to create device for %s; "
3456 "errno = %ld\n", con_driver->desc,
3457 PTR_ERR(con_driver->dev));
3458 con_driver->dev = NULL;
3459 } else {
3460 vtconsole_init_device(con_driver);
3461 }
3462
3463 err:
3464 release_console_sem();
3465 module_put(owner);
3466 return retval;
3467 }
3468 EXPORT_SYMBOL(register_con_driver);
3469
3470 /**
3471 * unregister_con_driver - unregister console driver from console layer
3472 * @csw: console driver
3473 *
3474 * DESCRIPTION: All drivers that registers to the console layer must
3475 * call this function upon exit, or if the console driver is in a state
3476 * where it won't be able to handle console services, such as the
3477 * framebuffer console without loaded framebuffer drivers.
3478 *
3479 * The driver must unbind first prior to unregistration.
3480 */
3481 int unregister_con_driver(const struct consw *csw)
3482 {
3483 int i, retval = -ENODEV;
3484
3485 acquire_console_sem();
3486
3487 /* cannot unregister a bound driver */
3488 if (con_is_bound(csw))
3489 goto err;
3490
3491 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3492 struct con_driver *con_driver = &registered_con_driver[i];
3493
3494 if (con_driver->con == csw &&
3495 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3496 vtconsole_deinit_device(con_driver);
3497 device_destroy(vtconsole_class,
3498 MKDEV(0, con_driver->node));
3499 con_driver->con = NULL;
3500 con_driver->desc = NULL;
3501 con_driver->dev = NULL;
3502 con_driver->node = 0;
3503 con_driver->flag = 0;
3504 con_driver->first = 0;
3505 con_driver->last = 0;
3506 retval = 0;
3507 break;
3508 }
3509 }
3510 err:
3511 release_console_sem();
3512 return retval;
3513 }
3514 EXPORT_SYMBOL(unregister_con_driver);
3515
3516 /*
3517 * If we support more console drivers, this function is used
3518 * when a driver wants to take over some existing consoles
3519 * and become default driver for newly opened ones.
3520 *
3521 * take_over_console is basically a register followed by unbind
3522 */
3523 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3524 {
3525 int err;
3526
3527 err = register_con_driver(csw, first, last);
3528
3529 if (!err)
3530 bind_con_driver(csw, first, last, deflt);
3531
3532 return err;
3533 }
3534
3535 /*
3536 * give_up_console is a wrapper to unregister_con_driver. It will only
3537 * work if driver is fully unbound.
3538 */
3539 void give_up_console(const struct consw *csw)
3540 {
3541 unregister_con_driver(csw);
3542 }
3543
3544 static int __init vtconsole_class_init(void)
3545 {
3546 int i;
3547
3548 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3549 if (IS_ERR(vtconsole_class)) {
3550 printk(KERN_WARNING "Unable to create vt console class; "
3551 "errno = %ld\n", PTR_ERR(vtconsole_class));
3552 vtconsole_class = NULL;
3553 }
3554
3555 /* Add system drivers to sysfs */
3556 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3557 struct con_driver *con = &registered_con_driver[i];
3558
3559 if (con->con && !con->dev) {
3560 con->dev = device_create(vtconsole_class, NULL,
3561 MKDEV(0, con->node),
3562 NULL, "vtcon%i",
3563 con->node);
3564
3565 if (IS_ERR(con->dev)) {
3566 printk(KERN_WARNING "Unable to create "
3567 "device for %s; errno = %ld\n",
3568 con->desc, PTR_ERR(con->dev));
3569 con->dev = NULL;
3570 } else {
3571 vtconsole_init_device(con);
3572 }
3573 }
3574 }
3575
3576 return 0;
3577 }
3578 postcore_initcall(vtconsole_class_init);
3579
3580 #endif
3581
3582 /*
3583 * Screen blanking
3584 */
3585
3586 static int set_vesa_blanking(char __user *p)
3587 {
3588 unsigned int mode;
3589
3590 if (get_user(mode, p + 1))
3591 return -EFAULT;
3592
3593 vesa_blank_mode = (mode < 4) ? mode : 0;
3594 return 0;
3595 }
3596
3597 void do_blank_screen(int entering_gfx)
3598 {
3599 struct vc_data *vc = vc_cons[fg_console].d;
3600 int i;
3601
3602 WARN_CONSOLE_UNLOCKED();
3603
3604 if (console_blanked) {
3605 if (blank_state == blank_vesa_wait) {
3606 blank_state = blank_off;
3607 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3608 }
3609 return;
3610 }
3611
3612 /* entering graphics mode? */
3613 if (entering_gfx) {
3614 hide_cursor(vc);
3615 save_screen(vc);
3616 vc->vc_sw->con_blank(vc, -1, 1);
3617 console_blanked = fg_console + 1;
3618 blank_state = blank_off;
3619 set_origin(vc);
3620 return;
3621 }
3622
3623 if (blank_state != blank_normal_wait)
3624 return;
3625 blank_state = blank_off;
3626
3627 /* don't blank graphics */
3628 if (vc->vc_mode != KD_TEXT) {
3629 console_blanked = fg_console + 1;
3630 return;
3631 }
3632
3633 hide_cursor(vc);
3634 del_timer_sync(&console_timer);
3635 blank_timer_expired = 0;
3636
3637 save_screen(vc);
3638 /* In case we need to reset origin, blanking hook returns 1 */
3639 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3640 console_blanked = fg_console + 1;
3641 if (i)
3642 set_origin(vc);
3643
3644 if (console_blank_hook && console_blank_hook(1))
3645 return;
3646
3647 if (vesa_off_interval && vesa_blank_mode) {
3648 blank_state = blank_vesa_wait;
3649 mod_timer(&console_timer, jiffies + vesa_off_interval);
3650 }
3651 }
3652 EXPORT_SYMBOL(do_blank_screen);
3653
3654 /*
3655 * Called by timer as well as from vt_console_driver
3656 */
3657 void do_unblank_screen(int leaving_gfx)
3658 {
3659 struct vc_data *vc;
3660
3661 /* This should now always be called from a "sane" (read: can schedule)
3662 * context for the sake of the low level drivers, except in the special
3663 * case of oops_in_progress
3664 */
3665 if (!oops_in_progress)
3666 might_sleep();
3667
3668 WARN_CONSOLE_UNLOCKED();
3669
3670 ignore_poke = 0;
3671 if (!console_blanked)
3672 return;
3673 if (!vc_cons_allocated(fg_console)) {
3674 /* impossible */
3675 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3676 return;
3677 }
3678 vc = vc_cons[fg_console].d;
3679 if (vc->vc_mode != KD_TEXT)
3680 return; /* but leave console_blanked != 0 */
3681
3682 if (blankinterval) {
3683 mod_timer(&console_timer, jiffies + blankinterval);
3684 blank_state = blank_normal_wait;
3685 }
3686
3687 console_blanked = 0;
3688 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3689 /* Low-level driver cannot restore -> do it ourselves */
3690 update_screen(vc);
3691 if (console_blank_hook)
3692 console_blank_hook(0);
3693 set_palette(vc);
3694 set_cursor(vc);
3695 }
3696 EXPORT_SYMBOL(do_unblank_screen);
3697
3698 /*
3699 * This is called by the outside world to cause a forced unblank, mostly for
3700 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3701 * call it with 1 as an argument and so force a mode restore... that may kill
3702 * X or at least garbage the screen but would also make the Oops visible...
3703 */
3704 void unblank_screen(void)
3705 {
3706 do_unblank_screen(0);
3707 }
3708
3709 /*
3710 * We defer the timer blanking to work queue so it can take the console mutex
3711 * (console operations can still happen at irq time, but only from printk which
3712 * has the console mutex. Not perfect yet, but better than no locking
3713 */
3714 static void blank_screen_t(unsigned long dummy)
3715 {
3716 if (unlikely(!keventd_up())) {
3717 mod_timer(&console_timer, jiffies + blankinterval);
3718 return;
3719 }
3720 blank_timer_expired = 1;
3721 schedule_work(&console_work);
3722 }
3723
3724 void poke_blanked_console(void)
3725 {
3726 WARN_CONSOLE_UNLOCKED();
3727
3728 /* Add this so we quickly catch whoever might call us in a non
3729 * safe context. Nowadays, unblank_screen() isn't to be called in
3730 * atomic contexts and is allowed to schedule (with the special case
3731 * of oops_in_progress, but that isn't of any concern for this
3732 * function. --BenH.
3733 */
3734 might_sleep();
3735
3736 /* This isn't perfectly race free, but a race here would be mostly harmless,
3737 * at worse, we'll do a spurrious blank and it's unlikely
3738 */
3739 del_timer(&console_timer);
3740 blank_timer_expired = 0;
3741
3742 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3743 return;
3744 if (console_blanked)
3745 unblank_screen();
3746 else if (blankinterval) {
3747 mod_timer(&console_timer, jiffies + blankinterval);
3748 blank_state = blank_normal_wait;
3749 }
3750 }
3751
3752 /*
3753 * Palettes
3754 */
3755
3756 static void set_palette(struct vc_data *vc)
3757 {
3758 WARN_CONSOLE_UNLOCKED();
3759
3760 if (vc->vc_mode != KD_GRAPHICS)
3761 vc->vc_sw->con_set_palette(vc, color_table);
3762 }
3763
3764 static int set_get_cmap(unsigned char __user *arg, int set)
3765 {
3766 int i, j, k;
3767
3768 WARN_CONSOLE_UNLOCKED();
3769
3770 for (i = 0; i < 16; i++)
3771 if (set) {
3772 get_user(default_red[i], arg++);
3773 get_user(default_grn[i], arg++);
3774 get_user(default_blu[i], arg++);
3775 } else {
3776 put_user(default_red[i], arg++);
3777 put_user(default_grn[i], arg++);
3778 put_user(default_blu[i], arg++);
3779 }
3780 if (set) {
3781 for (i = 0; i < MAX_NR_CONSOLES; i++)
3782 if (vc_cons_allocated(i)) {
3783 for (j = k = 0; j < 16; j++) {
3784 vc_cons[i].d->vc_palette[k++] = default_red[j];
3785 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3786 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3787 }
3788 set_palette(vc_cons[i].d);
3789 }
3790 }
3791 return 0;
3792 }
3793
3794 /*
3795 * Load palette into the DAC registers. arg points to a colour
3796 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3797 */
3798
3799 int con_set_cmap(unsigned char __user *arg)
3800 {
3801 int rc;
3802
3803 acquire_console_sem();
3804 rc = set_get_cmap (arg,1);
3805 release_console_sem();
3806
3807 return rc;
3808 }
3809
3810 int con_get_cmap(unsigned char __user *arg)
3811 {
3812 int rc;
3813
3814 acquire_console_sem();
3815 rc = set_get_cmap (arg,0);
3816 release_console_sem();
3817
3818 return rc;
3819 }
3820
3821 void reset_palette(struct vc_data *vc)
3822 {
3823 int j, k;
3824 for (j=k=0; j<16; j++) {
3825 vc->vc_palette[k++] = default_red[j];
3826 vc->vc_palette[k++] = default_grn[j];
3827 vc->vc_palette[k++] = default_blu[j];
3828 }
3829 set_palette(vc);
3830 }
3831
3832 /*
3833 * Font switching
3834 *
3835 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3836 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3837 * depending on width) reserved for each character which is kinda wasty, but
3838 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3839 * is upto the actual low-level console-driver convert data into its favorite
3840 * format (maybe we should add a `fontoffset' field to the `display'
3841 * structure so we won't have to convert the fontdata all the time.
3842 * /Jes
3843 */
3844
3845 #define max_font_size 65536
3846
3847 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3848 {
3849 struct console_font font;
3850 int rc = -EINVAL;
3851 int c;
3852
3853 if (vc->vc_mode != KD_TEXT)
3854 return -EINVAL;
3855
3856 if (op->data) {
3857 font.data = kmalloc(max_font_size, GFP_KERNEL);
3858 if (!font.data)
3859 return -ENOMEM;
3860 } else
3861 font.data = NULL;
3862
3863 acquire_console_sem();
3864 if (vc->vc_sw->con_font_get)
3865 rc = vc->vc_sw->con_font_get(vc, &font);
3866 else
3867 rc = -ENOSYS;
3868 release_console_sem();
3869
3870 if (rc)
3871 goto out;
3872
3873 c = (font.width+7)/8 * 32 * font.charcount;
3874
3875 if (op->data && font.charcount > op->charcount)
3876 rc = -ENOSPC;
3877 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3878 if (font.width > op->width || font.height > op->height)
3879 rc = -ENOSPC;
3880 } else {
3881 if (font.width != 8)
3882 rc = -EIO;
3883 else if ((op->height && font.height > op->height) ||
3884 font.height > 32)
3885 rc = -ENOSPC;
3886 }
3887 if (rc)
3888 goto out;
3889
3890 op->height = font.height;
3891 op->width = font.width;
3892 op->charcount = font.charcount;
3893
3894 if (op->data && copy_to_user(op->data, font.data, c))
3895 rc = -EFAULT;
3896
3897 out:
3898 kfree(font.data);
3899 return rc;
3900 }
3901
3902 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3903 {
3904 struct console_font font;
3905 int rc = -EINVAL;
3906 int size;
3907
3908 if (vc->vc_mode != KD_TEXT)
3909 return -EINVAL;
3910 if (!op->data)
3911 return -EINVAL;
3912 if (op->charcount > 512)
3913 return -EINVAL;
3914 if (!op->height) { /* Need to guess font height [compat] */
3915 int h, i;
3916 u8 __user *charmap = op->data;
3917 u8 tmp;
3918
3919 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3920 so that we can get rid of this soon */
3921 if (!(op->flags & KD_FONT_FLAG_OLD))
3922 return -EINVAL;
3923 for (h = 32; h > 0; h--)
3924 for (i = 0; i < op->charcount; i++) {
3925 if (get_user(tmp, &charmap[32*i+h-1]))
3926 return -EFAULT;
3927 if (tmp)
3928 goto nonzero;
3929 }
3930 return -EINVAL;
3931 nonzero:
3932 op->height = h;
3933 }
3934 if (op->width <= 0 || op->width > 32 || op->height > 32)
3935 return -EINVAL;
3936 size = (op->width+7)/8 * 32 * op->charcount;
3937 if (size > max_font_size)
3938 return -ENOSPC;
3939 font.charcount = op->charcount;
3940 font.height = op->height;
3941 font.width = op->width;
3942 font.data = kmalloc(size, GFP_KERNEL);
3943 if (!font.data)
3944 return -ENOMEM;
3945 if (copy_from_user(font.data, op->data, size)) {
3946 kfree(font.data);
3947 return -EFAULT;
3948 }
3949 acquire_console_sem();
3950 if (vc->vc_sw->con_font_set)
3951 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3952 else
3953 rc = -ENOSYS;
3954 release_console_sem();
3955 kfree(font.data);
3956 return rc;
3957 }
3958
3959 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3960 {
3961 struct console_font font = {.width = op->width, .height = op->height};
3962 char name[MAX_FONT_NAME];
3963 char *s = name;
3964 int rc;
3965
3966 if (vc->vc_mode != KD_TEXT)
3967 return -EINVAL;
3968
3969 if (!op->data)
3970 s = NULL;
3971 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3972 return -EFAULT;
3973 else
3974 name[MAX_FONT_NAME - 1] = 0;
3975
3976 acquire_console_sem();
3977 if (vc->vc_sw->con_font_default)
3978 rc = vc->vc_sw->con_font_default(vc, &font, s);
3979 else
3980 rc = -ENOSYS;
3981 release_console_sem();
3982 if (!rc) {
3983 op->width = font.width;
3984 op->height = font.height;
3985 }
3986 return rc;
3987 }
3988
3989 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3990 {
3991 int con = op->height;
3992 int rc;
3993
3994 if (vc->vc_mode != KD_TEXT)
3995 return -EINVAL;
3996
3997 acquire_console_sem();
3998 if (!vc->vc_sw->con_font_copy)
3999 rc = -ENOSYS;
4000 else if (con < 0 || !vc_cons_allocated(con))
4001 rc = -ENOTTY;
4002 else if (con == vc->vc_num) /* nothing to do */
4003 rc = 0;
4004 else
4005 rc = vc->vc_sw->con_font_copy(vc, con);
4006 release_console_sem();
4007 return rc;
4008 }
4009
4010 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4011 {
4012 switch (op->op) {
4013 case KD_FONT_OP_SET:
4014 return con_font_set(vc, op);
4015 case KD_FONT_OP_GET:
4016 return con_font_get(vc, op);
4017 case KD_FONT_OP_SET_DEFAULT:
4018 return con_font_default(vc, op);
4019 case KD_FONT_OP_COPY:
4020 return con_font_copy(vc, op);
4021 }
4022 return -ENOSYS;
4023 }
4024
4025 /*
4026 * Interface exported to selection and vcs.
4027 */
4028
4029 /* used by selection */
4030 u16 screen_glyph(struct vc_data *vc, int offset)
4031 {
4032 u16 w = scr_readw(screenpos(vc, offset, 1));
4033 u16 c = w & 0xff;
4034
4035 if (w & vc->vc_hi_font_mask)
4036 c |= 0x100;
4037 return c;
4038 }
4039 EXPORT_SYMBOL_GPL(screen_glyph);
4040
4041 /* used by vcs - note the word offset */
4042 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4043 {
4044 return screenpos(vc, 2 * w_offset, viewed);
4045 }
4046
4047 void getconsxy(struct vc_data *vc, unsigned char *p)
4048 {
4049 p[0] = vc->vc_x;
4050 p[1] = vc->vc_y;
4051 }
4052
4053 void putconsxy(struct vc_data *vc, unsigned char *p)
4054 {
4055 hide_cursor(vc);
4056 gotoxy(vc, p[0], p[1]);
4057 set_cursor(vc);
4058 }
4059
4060 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4061 {
4062 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4063 return softcursor_original;
4064 return scr_readw(org);
4065 }
4066
4067 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4068 {
4069 scr_writew(val, org);
4070 if ((unsigned long)org == vc->vc_pos) {
4071 softcursor_original = -1;
4072 add_softcursor(vc);
4073 }
4074 }
4075
4076 /*
4077 * Visible symbols for modules
4078 */
4079
4080 EXPORT_SYMBOL(color_table);
4081 EXPORT_SYMBOL(default_red);
4082 EXPORT_SYMBOL(default_grn);
4083 EXPORT_SYMBOL(default_blu);
4084 EXPORT_SYMBOL(update_region);
4085 EXPORT_SYMBOL(redraw_screen);
4086 EXPORT_SYMBOL(vc_resize);
4087 EXPORT_SYMBOL(fg_console);
4088 EXPORT_SYMBOL(console_blank_hook);
4089 EXPORT_SYMBOL(console_blanked);
4090 EXPORT_SYMBOL(vc_cons);
4091 #ifndef VT_SINGLE_DRIVER
4092 EXPORT_SYMBOL(take_over_console);
4093 EXPORT_SYMBOL(give_up_console);
4094 #endif
Support for the Chinese Samsung S3C2440 based development boards