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Merge tag 'omap-devel-am33xx-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / tty / vt / vt.c
1 /*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5 /*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71 */
72
73 #include <linux/module.h>
74 #include <linux/types.h>
75 #include <linux/sched.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
81 #include <linux/kd.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
84 #include <linux/mm.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111
112 struct con_driver {
113 const struct consw *con;
114 const char *desc;
115 struct device *dev;
116 int node;
117 int first;
118 int last;
119 int flag;
120 };
121
122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
123 const struct consw *conswitchp;
124
125 /* A bitmap for codes <32. A bit of 1 indicates that the code
126 * corresponding to that bit number invokes some special action
127 * (such as cursor movement) and should not be displayed as a
128 * glyph unless the disp_ctrl mode is explicitly enabled.
129 */
130 #define CTRL_ACTION 0x0d00ff81
131 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
132
133 /*
134 * Here is the default bell parameters: 750HZ, 1/8th of a second
135 */
136 #define DEFAULT_BELL_PITCH 750
137 #define DEFAULT_BELL_DURATION (HZ/8)
138
139 struct vc vc_cons [MAX_NR_CONSOLES];
140
141 #ifndef VT_SINGLE_DRIVER
142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143 #endif
144
145 static int con_open(struct tty_struct *, struct file *);
146 static void vc_init(struct vc_data *vc, unsigned int rows,
147 unsigned int cols, int do_clear);
148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149 static void save_cur(struct vc_data *vc);
150 static void reset_terminal(struct vc_data *vc, int do_clear);
151 static void con_flush_chars(struct tty_struct *tty);
152 static int set_vesa_blanking(char __user *p);
153 static void set_cursor(struct vc_data *vc);
154 static void hide_cursor(struct vc_data *vc);
155 static void console_callback(struct work_struct *ignored);
156 static void blank_screen_t(unsigned long dummy);
157 static void set_palette(struct vc_data *vc);
158
159 static int printable; /* Is console ready for printing? */
160 int default_utf8 = true;
161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
162 int global_cursor_default = -1;
163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
164
165 static int cur_default = CUR_DEFAULT;
166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168 /*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172 static int ignore_poke;
173
174 int do_poke_blanked_console;
175 int console_blanked;
176
177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
178 static int vesa_off_interval;
179 static int blankinterval = 10*60;
180 core_param(consoleblank, blankinterval, int, 0444);
181
182 static DECLARE_WORK(console_work, console_callback);
183
184 /*
185 * fg_console is the current virtual console,
186 * last_console is the last used one,
187 * want_console is the console we want to switch to,
188 * saved_* variants are for save/restore around kernel debugger enter/leave
189 */
190 int fg_console;
191 int last_console;
192 int want_console = -1;
193 static int saved_fg_console;
194 static int saved_last_console;
195 static int saved_want_console;
196 static int saved_vc_mode;
197 static int saved_console_blanked;
198
199 /*
200 * For each existing display, we have a pointer to console currently visible
201 * on that display, allowing consoles other than fg_console to be refreshed
202 * appropriately. Unless the low-level driver supplies its own display_fg
203 * variable, we use this one for the "master display".
204 */
205 static struct vc_data *master_display_fg;
206
207 /*
208 * Unfortunately, we need to delay tty echo when we're currently writing to the
209 * console since the code is (and always was) not re-entrant, so we schedule
210 * all flip requests to process context with schedule-task() and run it from
211 * console_callback().
212 */
213
214 /*
215 * For the same reason, we defer scrollback to the console callback.
216 */
217 static int scrollback_delta;
218
219 /*
220 * Hook so that the power management routines can (un)blank
221 * the console on our behalf.
222 */
223 int (*console_blank_hook)(int);
224
225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
226 static int blank_state;
227 static int blank_timer_expired;
228 enum {
229 blank_off = 0,
230 blank_normal_wait,
231 blank_vesa_wait,
232 };
233
234 /*
235 * /sys/class/tty/tty0/
236 *
237 * the attribute 'active' contains the name of the current vc
238 * console and it supports poll() to detect vc switches
239 */
240 static struct device *tty0dev;
241
242 /*
243 * Notifier list for console events.
244 */
245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
246
247 int register_vt_notifier(struct notifier_block *nb)
248 {
249 return atomic_notifier_chain_register(&vt_notifier_list, nb);
250 }
251 EXPORT_SYMBOL_GPL(register_vt_notifier);
252
253 int unregister_vt_notifier(struct notifier_block *nb)
254 {
255 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
256 }
257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
258
259 static void notify_write(struct vc_data *vc, unsigned int unicode)
260 {
261 struct vt_notifier_param param = { .vc = vc, .c = unicode };
262 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
263 }
264
265 static void notify_update(struct vc_data *vc)
266 {
267 struct vt_notifier_param param = { .vc = vc };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
269 }
270 /*
271 * Low-Level Functions
272 */
273
274 #define IS_FG(vc) ((vc)->vc_num == fg_console)
275
276 #ifdef VT_BUF_VRAM_ONLY
277 #define DO_UPDATE(vc) 0
278 #else
279 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
280 #endif
281
282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283 {
284 unsigned short *p;
285
286 if (!viewed)
287 p = (unsigned short *)(vc->vc_origin + offset);
288 else if (!vc->vc_sw->con_screen_pos)
289 p = (unsigned short *)(vc->vc_visible_origin + offset);
290 else
291 p = vc->vc_sw->con_screen_pos(vc, offset);
292 return p;
293 }
294
295 /* Called from the keyboard irq path.. */
296 static inline void scrolldelta(int lines)
297 {
298 /* FIXME */
299 /* scrolldelta needs some kind of consistency lock, but the BKL was
300 and still is not protecting versus the scheduled back end */
301 scrollback_delta += lines;
302 schedule_console_callback();
303 }
304
305 void schedule_console_callback(void)
306 {
307 schedule_work(&console_work);
308 }
309
310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
311 {
312 unsigned short *d, *s;
313
314 if (t+nr >= b)
315 nr = b - t - 1;
316 if (b > vc->vc_rows || t >= b || nr < 1)
317 return;
318 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
319 return;
320 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
322 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
323 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
324 vc->vc_size_row * nr);
325 }
326
327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
328 {
329 unsigned short *s;
330 unsigned int step;
331
332 if (t+nr >= b)
333 nr = b - t - 1;
334 if (b > vc->vc_rows || t >= b || nr < 1)
335 return;
336 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
337 return;
338 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
339 step = vc->vc_cols * nr;
340 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
341 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
342 }
343
344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
345 {
346 #ifndef VT_BUF_VRAM_ONLY
347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
387 #endif
388 }
389
390 void update_region(struct vc_data *vc, unsigned long start, int count)
391 {
392 WARN_CONSOLE_UNLOCKED();
393
394 if (DO_UPDATE(vc)) {
395 hide_cursor(vc);
396 do_update_region(vc, start, count);
397 set_cursor(vc);
398 }
399 }
400
401 /* Structure of attributes is hardware-dependent */
402
403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
404 u8 _underline, u8 _reverse, u8 _italic)
405 {
406 if (vc->vc_sw->con_build_attr)
407 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
408 _blink, _underline, _reverse, _italic);
409
410 #ifndef VT_BUF_VRAM_ONLY
411 /*
412 * ++roman: I completely changed the attribute format for monochrome
413 * mode (!can_do_color). The formerly used MDA (monochrome display
414 * adapter) format didn't allow the combination of certain effects.
415 * Now the attribute is just a bit vector:
416 * Bit 0..1: intensity (0..2)
417 * Bit 2 : underline
418 * Bit 3 : reverse
419 * Bit 7 : blink
420 */
421 {
422 u8 a = _color;
423 if (!vc->vc_can_do_color)
424 return _intensity |
425 (_italic ? 2 : 0) |
426 (_underline ? 4 : 0) |
427 (_reverse ? 8 : 0) |
428 (_blink ? 0x80 : 0);
429 if (_italic)
430 a = (a & 0xF0) | vc->vc_itcolor;
431 else if (_underline)
432 a = (a & 0xf0) | vc->vc_ulcolor;
433 else if (_intensity == 0)
434 a = (a & 0xf0) | vc->vc_ulcolor;
435 if (_reverse)
436 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437 if (_blink)
438 a ^= 0x80;
439 if (_intensity == 2)
440 a ^= 0x08;
441 if (vc->vc_hi_font_mask == 0x100)
442 a <<= 1;
443 return a;
444 }
445 #else
446 return 0;
447 #endif
448 }
449
450 static void update_attr(struct vc_data *vc)
451 {
452 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
453 vc->vc_blink, vc->vc_underline,
454 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
455 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
456 }
457
458 /* Note: inverting the screen twice should revert to the original state */
459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
460 {
461 unsigned short *p;
462
463 WARN_CONSOLE_UNLOCKED();
464
465 count /= 2;
466 p = screenpos(vc, offset, viewed);
467 if (vc->vc_sw->con_invert_region)
468 vc->vc_sw->con_invert_region(vc, p, count);
469 #ifndef VT_BUF_VRAM_ONLY
470 else {
471 u16 *q = p;
472 int cnt = count;
473 u16 a;
474
475 if (!vc->vc_can_do_color) {
476 while (cnt--) {
477 a = scr_readw(q);
478 a ^= 0x0800;
479 scr_writew(a, q);
480 q++;
481 }
482 } else if (vc->vc_hi_font_mask == 0x100) {
483 while (cnt--) {
484 a = scr_readw(q);
485 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
486 scr_writew(a, q);
487 q++;
488 }
489 } else {
490 while (cnt--) {
491 a = scr_readw(q);
492 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
493 scr_writew(a, q);
494 q++;
495 }
496 }
497 }
498 #endif
499 if (DO_UPDATE(vc))
500 do_update_region(vc, (unsigned long) p, count);
501 }
502
503 /* used by selection: complement pointer position */
504 void complement_pos(struct vc_data *vc, int offset)
505 {
506 static int old_offset = -1;
507 static unsigned short old;
508 static unsigned short oldx, oldy;
509
510 WARN_CONSOLE_UNLOCKED();
511
512 if (old_offset != -1 && old_offset >= 0 &&
513 old_offset < vc->vc_screenbuf_size) {
514 scr_writew(old, screenpos(vc, old_offset, 1));
515 if (DO_UPDATE(vc))
516 vc->vc_sw->con_putc(vc, old, oldy, oldx);
517 }
518
519 old_offset = offset;
520
521 if (offset != -1 && offset >= 0 &&
522 offset < vc->vc_screenbuf_size) {
523 unsigned short new;
524 unsigned short *p;
525 p = screenpos(vc, offset, 1);
526 old = scr_readw(p);
527 new = old ^ vc->vc_complement_mask;
528 scr_writew(new, p);
529 if (DO_UPDATE(vc)) {
530 oldx = (offset >> 1) % vc->vc_cols;
531 oldy = (offset >> 1) / vc->vc_cols;
532 vc->vc_sw->con_putc(vc, new, oldy, oldx);
533 }
534 }
535
536 }
537
538 static void insert_char(struct vc_data *vc, unsigned int nr)
539 {
540 unsigned short *p = (unsigned short *) vc->vc_pos;
541
542 scr_memmovew(p + nr, p, vc->vc_cols - vc->vc_x);
543 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
544 vc->vc_need_wrap = 0;
545 if (DO_UPDATE(vc))
546 do_update_region(vc, (unsigned long) p,
547 (vc->vc_cols - vc->vc_x) / 2 + 1);
548 }
549
550 static void delete_char(struct vc_data *vc, unsigned int nr)
551 {
552 unsigned short *p = (unsigned short *) vc->vc_pos;
553
554 scr_memcpyw(p, p + nr, vc->vc_cols - vc->vc_x - nr);
555 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
556 nr * 2);
557 vc->vc_need_wrap = 0;
558 if (DO_UPDATE(vc))
559 do_update_region(vc, (unsigned long) p,
560 (vc->vc_cols - vc->vc_x) / 2);
561 }
562
563 static int softcursor_original;
564
565 static void add_softcursor(struct vc_data *vc)
566 {
567 int i = scr_readw((u16 *) vc->vc_pos);
568 u32 type = vc->vc_cursor_type;
569
570 if (! (type & 0x10)) return;
571 if (softcursor_original != -1) return;
572 softcursor_original = i;
573 i |= ((type >> 8) & 0xff00 );
574 i ^= ((type) & 0xff00 );
575 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577 scr_writew(i, (u16 *) vc->vc_pos);
578 if (DO_UPDATE(vc))
579 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
580 }
581
582 static void hide_softcursor(struct vc_data *vc)
583 {
584 if (softcursor_original != -1) {
585 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, softcursor_original,
588 vc->vc_y, vc->vc_x);
589 softcursor_original = -1;
590 }
591 }
592
593 static void hide_cursor(struct vc_data *vc)
594 {
595 if (vc == sel_cons)
596 clear_selection();
597 vc->vc_sw->con_cursor(vc, CM_ERASE);
598 hide_softcursor(vc);
599 }
600
601 static void set_cursor(struct vc_data *vc)
602 {
603 if (!IS_FG(vc) || console_blanked ||
604 vc->vc_mode == KD_GRAPHICS)
605 return;
606 if (vc->vc_deccm) {
607 if (vc == sel_cons)
608 clear_selection();
609 add_softcursor(vc);
610 if ((vc->vc_cursor_type & 0x0f) != 1)
611 vc->vc_sw->con_cursor(vc, CM_DRAW);
612 } else
613 hide_cursor(vc);
614 }
615
616 static void set_origin(struct vc_data *vc)
617 {
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!CON_IS_VISIBLE(vc) ||
621 !vc->vc_sw->con_set_origin ||
622 !vc->vc_sw->con_set_origin(vc))
623 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624 vc->vc_visible_origin = vc->vc_origin;
625 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
627 }
628
629 static inline void save_screen(struct vc_data *vc)
630 {
631 WARN_CONSOLE_UNLOCKED();
632
633 if (vc->vc_sw->con_save_screen)
634 vc->vc_sw->con_save_screen(vc);
635 }
636
637 /*
638 * Redrawing of screen
639 */
640
641 static void clear_buffer_attributes(struct vc_data *vc)
642 {
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
646
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
649 }
650 }
651
652 void redraw_screen(struct vc_data *vc, int is_switch)
653 {
654 int redraw = 0;
655
656 WARN_CONSOLE_UNLOCKED();
657
658 if (!vc) {
659 /* strange ... */
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
661 return;
662 }
663
664 if (is_switch) {
665 struct vc_data *old_vc = vc_cons[fg_console].d;
666 if (old_vc == vc)
667 return;
668 if (!CON_IS_VISIBLE(vc))
669 redraw = 1;
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
672 hide_cursor(old_vc);
673 if (!CON_IS_VISIBLE(old_vc)) {
674 save_screen(old_vc);
675 set_origin(old_vc);
676 }
677 if (tty0dev)
678 sysfs_notify(&tty0dev->kobj, NULL, "active");
679 } else {
680 hide_cursor(vc);
681 redraw = 1;
682 }
683
684 if (redraw) {
685 int update;
686 int old_was_color = vc->vc_can_do_color;
687
688 set_origin(vc);
689 update = vc->vc_sw->con_switch(vc);
690 set_palette(vc);
691 /*
692 * If console changed from mono<->color, the best we can do
693 * is to clear the buffer attributes. As it currently stands,
694 * rebuilding new attributes from the old buffer is not doable
695 * without overly complex code.
696 */
697 if (old_was_color != vc->vc_can_do_color) {
698 update_attr(vc);
699 clear_buffer_attributes(vc);
700 }
701
702 /* Forcibly update if we're panicing */
703 if ((update && vc->vc_mode != KD_GRAPHICS) ||
704 vt_force_oops_output(vc))
705 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
706 }
707 set_cursor(vc);
708 if (is_switch) {
709 set_leds();
710 compute_shiftstate();
711 notify_update(vc);
712 }
713 }
714
715 /*
716 * Allocation, freeing and resizing of VTs.
717 */
718
719 int vc_cons_allocated(unsigned int i)
720 {
721 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
722 }
723
724 static void visual_init(struct vc_data *vc, int num, int init)
725 {
726 /* ++Geert: vc->vc_sw->con_init determines console size */
727 if (vc->vc_sw)
728 module_put(vc->vc_sw->owner);
729 vc->vc_sw = conswitchp;
730 #ifndef VT_SINGLE_DRIVER
731 if (con_driver_map[num])
732 vc->vc_sw = con_driver_map[num];
733 #endif
734 __module_get(vc->vc_sw->owner);
735 vc->vc_num = num;
736 vc->vc_display_fg = &master_display_fg;
737 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
738 vc->vc_uni_pagedir = 0;
739 vc->vc_hi_font_mask = 0;
740 vc->vc_complement_mask = 0;
741 vc->vc_can_do_color = 0;
742 vc->vc_panic_force_write = false;
743 vc->vc_sw->con_init(vc, init);
744 if (!vc->vc_complement_mask)
745 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
746 vc->vc_s_complement_mask = vc->vc_complement_mask;
747 vc->vc_size_row = vc->vc_cols << 1;
748 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
749 }
750
751 int vc_allocate(unsigned int currcons) /* return 0 on success */
752 {
753 WARN_CONSOLE_UNLOCKED();
754
755 if (currcons >= MAX_NR_CONSOLES)
756 return -ENXIO;
757 if (!vc_cons[currcons].d) {
758 struct vc_data *vc;
759 struct vt_notifier_param param;
760
761 /* prevent users from taking too much memory */
762 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
763 return -EPERM;
764
765 /* due to the granularity of kmalloc, we waste some memory here */
766 /* the alloc is done in two steps, to optimize the common situation
767 of a 25x80 console (structsize=216, screenbuf_size=4000) */
768 /* although the numbers above are not valid since long ago, the
769 point is still up-to-date and the comment still has its value
770 even if only as a historical artifact. --mj, July 1998 */
771 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
772 if (!vc)
773 return -ENOMEM;
774 vc_cons[currcons].d = vc;
775 tty_port_init(&vc->port);
776 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
777 visual_init(vc, currcons, 1);
778 if (!*vc->vc_uni_pagedir_loc)
779 con_set_default_unimap(vc);
780 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
781 if (!vc->vc_screenbuf) {
782 kfree(vc);
783 vc_cons[currcons].d = NULL;
784 return -ENOMEM;
785 }
786
787 /* If no drivers have overridden us and the user didn't pass a
788 boot option, default to displaying the cursor */
789 if (global_cursor_default == -1)
790 global_cursor_default = 1;
791
792 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
793 vcs_make_sysfs(currcons);
794 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
795 }
796 return 0;
797 }
798
799 static inline int resize_screen(struct vc_data *vc, int width, int height,
800 int user)
801 {
802 /* Resizes the resolution of the display adapater */
803 int err = 0;
804
805 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
806 err = vc->vc_sw->con_resize(vc, width, height, user);
807
808 return err;
809 }
810
811 /*
812 * Change # of rows and columns (0 means unchanged/the size of fg_console)
813 * [this is to be used together with some user program
814 * like resize that changes the hardware videomode]
815 */
816 #define VC_RESIZE_MAXCOL (32767)
817 #define VC_RESIZE_MAXROW (32767)
818
819 /**
820 * vc_do_resize - resizing method for the tty
821 * @tty: tty being resized
822 * @real_tty: real tty (different to tty if a pty/tty pair)
823 * @vc: virtual console private data
824 * @cols: columns
825 * @lines: lines
826 *
827 * Resize a virtual console, clipping according to the actual constraints.
828 * If the caller passes a tty structure then update the termios winsize
829 * information and perform any necessary signal handling.
830 *
831 * Caller must hold the console semaphore. Takes the termios mutex and
832 * ctrl_lock of the tty IFF a tty is passed.
833 */
834
835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
836 unsigned int cols, unsigned int lines)
837 {
838 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
839 unsigned long end;
840 unsigned int old_rows, old_row_size;
841 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
842 unsigned int user;
843 unsigned short *newscreen;
844
845 WARN_CONSOLE_UNLOCKED();
846
847 if (!vc)
848 return -ENXIO;
849
850 user = vc->vc_resize_user;
851 vc->vc_resize_user = 0;
852
853 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
854 return -EINVAL;
855
856 new_cols = (cols ? cols : vc->vc_cols);
857 new_rows = (lines ? lines : vc->vc_rows);
858 new_row_size = new_cols << 1;
859 new_screen_size = new_row_size * new_rows;
860
861 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
862 return 0;
863
864 newscreen = kmalloc(new_screen_size, GFP_USER);
865 if (!newscreen)
866 return -ENOMEM;
867
868 old_rows = vc->vc_rows;
869 old_row_size = vc->vc_size_row;
870
871 err = resize_screen(vc, new_cols, new_rows, user);
872 if (err) {
873 kfree(newscreen);
874 return err;
875 }
876
877 vc->vc_rows = new_rows;
878 vc->vc_cols = new_cols;
879 vc->vc_size_row = new_row_size;
880 vc->vc_screenbuf_size = new_screen_size;
881
882 rlth = min(old_row_size, new_row_size);
883 rrem = new_row_size - rlth;
884 old_origin = vc->vc_origin;
885 new_origin = (long) newscreen;
886 new_scr_end = new_origin + new_screen_size;
887
888 if (vc->vc_y > new_rows) {
889 if (old_rows - vc->vc_y < new_rows) {
890 /*
891 * Cursor near the bottom, copy contents from the
892 * bottom of buffer
893 */
894 old_origin += (old_rows - new_rows) * old_row_size;
895 } else {
896 /*
897 * Cursor is in no man's land, copy 1/2 screenful
898 * from the top and bottom of cursor position
899 */
900 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
901 }
902 }
903
904 end = old_origin + old_row_size * min(old_rows, new_rows);
905
906 update_attr(vc);
907
908 while (old_origin < end) {
909 scr_memcpyw((unsigned short *) new_origin,
910 (unsigned short *) old_origin, rlth);
911 if (rrem)
912 scr_memsetw((void *)(new_origin + rlth),
913 vc->vc_video_erase_char, rrem);
914 old_origin += old_row_size;
915 new_origin += new_row_size;
916 }
917 if (new_scr_end > new_origin)
918 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
919 new_scr_end - new_origin);
920 kfree(vc->vc_screenbuf);
921 vc->vc_screenbuf = newscreen;
922 vc->vc_screenbuf_size = new_screen_size;
923 set_origin(vc);
924
925 /* do part of a reset_terminal() */
926 vc->vc_top = 0;
927 vc->vc_bottom = vc->vc_rows;
928 gotoxy(vc, vc->vc_x, vc->vc_y);
929 save_cur(vc);
930
931 if (tty) {
932 /* Rewrite the requested winsize data with the actual
933 resulting sizes */
934 struct winsize ws;
935 memset(&ws, 0, sizeof(ws));
936 ws.ws_row = vc->vc_rows;
937 ws.ws_col = vc->vc_cols;
938 ws.ws_ypixel = vc->vc_scan_lines;
939 tty_do_resize(tty, &ws);
940 }
941
942 if (CON_IS_VISIBLE(vc))
943 update_screen(vc);
944 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
945 return err;
946 }
947
948 /**
949 * vc_resize - resize a VT
950 * @vc: virtual console
951 * @cols: columns
952 * @rows: rows
953 *
954 * Resize a virtual console as seen from the console end of things. We
955 * use the common vc_do_resize methods to update the structures. The
956 * caller must hold the console sem to protect console internals and
957 * vc->port.tty
958 */
959
960 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
961 {
962 return vc_do_resize(vc->port.tty, vc, cols, rows);
963 }
964
965 /**
966 * vt_resize - resize a VT
967 * @tty: tty to resize
968 * @ws: winsize attributes
969 *
970 * Resize a virtual terminal. This is called by the tty layer as we
971 * register our own handler for resizing. The mutual helper does all
972 * the actual work.
973 *
974 * Takes the console sem and the called methods then take the tty
975 * termios_mutex and the tty ctrl_lock in that order.
976 */
977 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
978 {
979 struct vc_data *vc = tty->driver_data;
980 int ret;
981
982 console_lock();
983 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
984 console_unlock();
985 return ret;
986 }
987
988 void vc_deallocate(unsigned int currcons)
989 {
990 WARN_CONSOLE_UNLOCKED();
991
992 if (vc_cons_allocated(currcons)) {
993 struct vc_data *vc = vc_cons[currcons].d;
994 struct vt_notifier_param param = { .vc = vc };
995
996 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
997 vcs_remove_sysfs(currcons);
998 vc->vc_sw->con_deinit(vc);
999 put_pid(vc->vt_pid);
1000 module_put(vc->vc_sw->owner);
1001 kfree(vc->vc_screenbuf);
1002 if (currcons >= MIN_NR_CONSOLES)
1003 kfree(vc);
1004 vc_cons[currcons].d = NULL;
1005 }
1006 }
1007
1008 /*
1009 * VT102 emulator
1010 */
1011
1012 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1013 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1014 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1015
1016 #define decarm VC_REPEAT
1017 #define decckm VC_CKMODE
1018 #define kbdapplic VC_APPLIC
1019 #define lnm VC_CRLF
1020
1021 /*
1022 * this is what the terminal answers to a ESC-Z or csi0c query.
1023 */
1024 #define VT100ID "\033[?1;2c"
1025 #define VT102ID "\033[?6c"
1026
1027 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1028 8,12,10,14, 9,13,11,15 };
1029
1030 /* the default colour table, for VGA+ colour systems */
1031 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1032 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1033 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1034 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1035 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1036 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1037
1038 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1039 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1041
1042 /*
1043 * gotoxy() must verify all boundaries, because the arguments
1044 * might also be negative. If the given position is out of
1045 * bounds, the cursor is placed at the nearest margin.
1046 */
1047 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1048 {
1049 int min_y, max_y;
1050
1051 if (new_x < 0)
1052 vc->vc_x = 0;
1053 else {
1054 if (new_x >= vc->vc_cols)
1055 vc->vc_x = vc->vc_cols - 1;
1056 else
1057 vc->vc_x = new_x;
1058 }
1059
1060 if (vc->vc_decom) {
1061 min_y = vc->vc_top;
1062 max_y = vc->vc_bottom;
1063 } else {
1064 min_y = 0;
1065 max_y = vc->vc_rows;
1066 }
1067 if (new_y < min_y)
1068 vc->vc_y = min_y;
1069 else if (new_y >= max_y)
1070 vc->vc_y = max_y - 1;
1071 else
1072 vc->vc_y = new_y;
1073 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1074 vc->vc_need_wrap = 0;
1075 }
1076
1077 /* for absolute user moves, when decom is set */
1078 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1079 {
1080 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1081 }
1082
1083 void scrollback(struct vc_data *vc, int lines)
1084 {
1085 if (!lines)
1086 lines = vc->vc_rows / 2;
1087 scrolldelta(-lines);
1088 }
1089
1090 void scrollfront(struct vc_data *vc, int lines)
1091 {
1092 if (!lines)
1093 lines = vc->vc_rows / 2;
1094 scrolldelta(lines);
1095 }
1096
1097 static void lf(struct vc_data *vc)
1098 {
1099 /* don't scroll if above bottom of scrolling region, or
1100 * if below scrolling region
1101 */
1102 if (vc->vc_y + 1 == vc->vc_bottom)
1103 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1104 else if (vc->vc_y < vc->vc_rows - 1) {
1105 vc->vc_y++;
1106 vc->vc_pos += vc->vc_size_row;
1107 }
1108 vc->vc_need_wrap = 0;
1109 notify_write(vc, '\n');
1110 }
1111
1112 static void ri(struct vc_data *vc)
1113 {
1114 /* don't scroll if below top of scrolling region, or
1115 * if above scrolling region
1116 */
1117 if (vc->vc_y == vc->vc_top)
1118 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1119 else if (vc->vc_y > 0) {
1120 vc->vc_y--;
1121 vc->vc_pos -= vc->vc_size_row;
1122 }
1123 vc->vc_need_wrap = 0;
1124 }
1125
1126 static inline void cr(struct vc_data *vc)
1127 {
1128 vc->vc_pos -= vc->vc_x << 1;
1129 vc->vc_need_wrap = vc->vc_x = 0;
1130 notify_write(vc, '\r');
1131 }
1132
1133 static inline void bs(struct vc_data *vc)
1134 {
1135 if (vc->vc_x) {
1136 vc->vc_pos -= 2;
1137 vc->vc_x--;
1138 vc->vc_need_wrap = 0;
1139 notify_write(vc, '\b');
1140 }
1141 }
1142
1143 static inline void del(struct vc_data *vc)
1144 {
1145 /* ignored */
1146 }
1147
1148 static void csi_J(struct vc_data *vc, int vpar)
1149 {
1150 unsigned int count;
1151 unsigned short * start;
1152
1153 switch (vpar) {
1154 case 0: /* erase from cursor to end of display */
1155 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1156 start = (unsigned short *)vc->vc_pos;
1157 break;
1158 case 1: /* erase from start to cursor */
1159 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1160 start = (unsigned short *)vc->vc_origin;
1161 break;
1162 case 3: /* erase scroll-back buffer (and whole display) */
1163 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1164 vc->vc_screenbuf_size >> 1);
1165 set_origin(vc);
1166 /* fall through */
1167 case 2: /* erase whole display */
1168 count = vc->vc_cols * vc->vc_rows;
1169 start = (unsigned short *)vc->vc_origin;
1170 break;
1171 default:
1172 return;
1173 }
1174 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1175 if (DO_UPDATE(vc))
1176 do_update_region(vc, (unsigned long) start, count);
1177 vc->vc_need_wrap = 0;
1178 }
1179
1180 static void csi_K(struct vc_data *vc, int vpar)
1181 {
1182 unsigned int count;
1183 unsigned short * start;
1184
1185 switch (vpar) {
1186 case 0: /* erase from cursor to end of line */
1187 count = vc->vc_cols - vc->vc_x;
1188 start = (unsigned short *)vc->vc_pos;
1189 break;
1190 case 1: /* erase from start of line to cursor */
1191 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1192 count = vc->vc_x + 1;
1193 break;
1194 case 2: /* erase whole line */
1195 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1196 count = vc->vc_cols;
1197 break;
1198 default:
1199 return;
1200 }
1201 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1202 vc->vc_need_wrap = 0;
1203 if (DO_UPDATE(vc))
1204 do_update_region(vc, (unsigned long) start, count);
1205 }
1206
1207 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1208 { /* not vt100? */
1209 int count;
1210
1211 if (!vpar)
1212 vpar++;
1213 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1214
1215 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1216 if (DO_UPDATE(vc))
1217 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1218 vc->vc_need_wrap = 0;
1219 }
1220
1221 static void default_attr(struct vc_data *vc)
1222 {
1223 vc->vc_intensity = 1;
1224 vc->vc_italic = 0;
1225 vc->vc_underline = 0;
1226 vc->vc_reverse = 0;
1227 vc->vc_blink = 0;
1228 vc->vc_color = vc->vc_def_color;
1229 }
1230
1231 /* console_lock is held */
1232 static void csi_m(struct vc_data *vc)
1233 {
1234 int i;
1235
1236 for (i = 0; i <= vc->vc_npar; i++)
1237 switch (vc->vc_par[i]) {
1238 case 0: /* all attributes off */
1239 default_attr(vc);
1240 break;
1241 case 1:
1242 vc->vc_intensity = 2;
1243 break;
1244 case 2:
1245 vc->vc_intensity = 0;
1246 break;
1247 case 3:
1248 vc->vc_italic = 1;
1249 break;
1250 case 4:
1251 vc->vc_underline = 1;
1252 break;
1253 case 5:
1254 vc->vc_blink = 1;
1255 break;
1256 case 7:
1257 vc->vc_reverse = 1;
1258 break;
1259 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1260 * Select primary font, don't display
1261 * control chars if defined, don't set
1262 * bit 8 on output.
1263 */
1264 vc->vc_translate = set_translate(vc->vc_charset == 0
1265 ? vc->vc_G0_charset
1266 : vc->vc_G1_charset, vc);
1267 vc->vc_disp_ctrl = 0;
1268 vc->vc_toggle_meta = 0;
1269 break;
1270 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1271 * Select first alternate font, lets
1272 * chars < 32 be displayed as ROM chars.
1273 */
1274 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1275 vc->vc_disp_ctrl = 1;
1276 vc->vc_toggle_meta = 0;
1277 break;
1278 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1279 * Select second alternate font, toggle
1280 * high bit before displaying as ROM char.
1281 */
1282 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1283 vc->vc_disp_ctrl = 1;
1284 vc->vc_toggle_meta = 1;
1285 break;
1286 case 21:
1287 case 22:
1288 vc->vc_intensity = 1;
1289 break;
1290 case 23:
1291 vc->vc_italic = 0;
1292 break;
1293 case 24:
1294 vc->vc_underline = 0;
1295 break;
1296 case 25:
1297 vc->vc_blink = 0;
1298 break;
1299 case 27:
1300 vc->vc_reverse = 0;
1301 break;
1302 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1303 * Enables underscore, white foreground
1304 * with white underscore (Linux - use
1305 * default foreground).
1306 */
1307 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1308 vc->vc_underline = 1;
1309 break;
1310 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1311 * Disable underline option.
1312 * Reset colour to default? It did this
1313 * before...
1314 */
1315 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1316 vc->vc_underline = 0;
1317 break;
1318 case 49:
1319 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1320 break;
1321 default:
1322 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1323 vc->vc_color = color_table[vc->vc_par[i] - 30]
1324 | (vc->vc_color & 0xf0);
1325 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1326 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1327 | (vc->vc_color & 0x0f);
1328 break;
1329 }
1330 update_attr(vc);
1331 }
1332
1333 static void respond_string(const char *p, struct tty_struct *tty)
1334 {
1335 while (*p) {
1336 tty_insert_flip_char(tty, *p, 0);
1337 p++;
1338 }
1339 tty_schedule_flip(tty);
1340 }
1341
1342 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1343 {
1344 char buf[40];
1345
1346 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1347 respond_string(buf, tty);
1348 }
1349
1350 static inline void status_report(struct tty_struct *tty)
1351 {
1352 respond_string("\033[0n", tty); /* Terminal ok */
1353 }
1354
1355 static inline void respond_ID(struct tty_struct * tty)
1356 {
1357 respond_string(VT102ID, tty);
1358 }
1359
1360 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1361 {
1362 char buf[8];
1363
1364 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1365 (char)('!' + mry));
1366 respond_string(buf, tty);
1367 }
1368
1369 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1370 int mouse_reporting(void)
1371 {
1372 return vc_cons[fg_console].d->vc_report_mouse;
1373 }
1374
1375 /* console_lock is held */
1376 static void set_mode(struct vc_data *vc, int on_off)
1377 {
1378 int i;
1379
1380 for (i = 0; i <= vc->vc_npar; i++)
1381 if (vc->vc_ques) {
1382 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1383 case 1: /* Cursor keys send ^[Ox/^[[x */
1384 if (on_off)
1385 set_kbd(vc, decckm);
1386 else
1387 clr_kbd(vc, decckm);
1388 break;
1389 case 3: /* 80/132 mode switch unimplemented */
1390 vc->vc_deccolm = on_off;
1391 #if 0
1392 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1393 /* this alone does not suffice; some user mode
1394 utility has to change the hardware regs */
1395 #endif
1396 break;
1397 case 5: /* Inverted screen on/off */
1398 if (vc->vc_decscnm != on_off) {
1399 vc->vc_decscnm = on_off;
1400 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1401 update_attr(vc);
1402 }
1403 break;
1404 case 6: /* Origin relative/absolute */
1405 vc->vc_decom = on_off;
1406 gotoxay(vc, 0, 0);
1407 break;
1408 case 7: /* Autowrap on/off */
1409 vc->vc_decawm = on_off;
1410 break;
1411 case 8: /* Autorepeat on/off */
1412 if (on_off)
1413 set_kbd(vc, decarm);
1414 else
1415 clr_kbd(vc, decarm);
1416 break;
1417 case 9:
1418 vc->vc_report_mouse = on_off ? 1 : 0;
1419 break;
1420 case 25: /* Cursor on/off */
1421 vc->vc_deccm = on_off;
1422 break;
1423 case 1000:
1424 vc->vc_report_mouse = on_off ? 2 : 0;
1425 break;
1426 }
1427 } else {
1428 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1429 case 3: /* Monitor (display ctrls) */
1430 vc->vc_disp_ctrl = on_off;
1431 break;
1432 case 4: /* Insert Mode on/off */
1433 vc->vc_decim = on_off;
1434 break;
1435 case 20: /* Lf, Enter == CrLf/Lf */
1436 if (on_off)
1437 set_kbd(vc, lnm);
1438 else
1439 clr_kbd(vc, lnm);
1440 break;
1441 }
1442 }
1443 }
1444
1445 /* console_lock is held */
1446 static void setterm_command(struct vc_data *vc)
1447 {
1448 switch(vc->vc_par[0]) {
1449 case 1: /* set color for underline mode */
1450 if (vc->vc_can_do_color &&
1451 vc->vc_par[1] < 16) {
1452 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1453 if (vc->vc_underline)
1454 update_attr(vc);
1455 }
1456 break;
1457 case 2: /* set color for half intensity mode */
1458 if (vc->vc_can_do_color &&
1459 vc->vc_par[1] < 16) {
1460 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1461 if (vc->vc_intensity == 0)
1462 update_attr(vc);
1463 }
1464 break;
1465 case 8: /* store colors as defaults */
1466 vc->vc_def_color = vc->vc_attr;
1467 if (vc->vc_hi_font_mask == 0x100)
1468 vc->vc_def_color >>= 1;
1469 default_attr(vc);
1470 update_attr(vc);
1471 break;
1472 case 9: /* set blanking interval */
1473 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1474 poke_blanked_console();
1475 break;
1476 case 10: /* set bell frequency in Hz */
1477 if (vc->vc_npar >= 1)
1478 vc->vc_bell_pitch = vc->vc_par[1];
1479 else
1480 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1481 break;
1482 case 11: /* set bell duration in msec */
1483 if (vc->vc_npar >= 1)
1484 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1485 vc->vc_par[1] * HZ / 1000 : 0;
1486 else
1487 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1488 break;
1489 case 12: /* bring specified console to the front */
1490 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1491 set_console(vc->vc_par[1] - 1);
1492 break;
1493 case 13: /* unblank the screen */
1494 poke_blanked_console();
1495 break;
1496 case 14: /* set vesa powerdown interval */
1497 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1498 break;
1499 case 15: /* activate the previous console */
1500 set_console(last_console);
1501 break;
1502 }
1503 }
1504
1505 /* console_lock is held */
1506 static void csi_at(struct vc_data *vc, unsigned int nr)
1507 {
1508 if (nr > vc->vc_cols - vc->vc_x)
1509 nr = vc->vc_cols - vc->vc_x;
1510 else if (!nr)
1511 nr = 1;
1512 insert_char(vc, nr);
1513 }
1514
1515 /* console_lock is held */
1516 static void csi_L(struct vc_data *vc, unsigned int nr)
1517 {
1518 if (nr > vc->vc_rows - vc->vc_y)
1519 nr = vc->vc_rows - vc->vc_y;
1520 else if (!nr)
1521 nr = 1;
1522 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1523 vc->vc_need_wrap = 0;
1524 }
1525
1526 /* console_lock is held */
1527 static void csi_P(struct vc_data *vc, unsigned int nr)
1528 {
1529 if (nr > vc->vc_cols - vc->vc_x)
1530 nr = vc->vc_cols - vc->vc_x;
1531 else if (!nr)
1532 nr = 1;
1533 delete_char(vc, nr);
1534 }
1535
1536 /* console_lock is held */
1537 static void csi_M(struct vc_data *vc, unsigned int nr)
1538 {
1539 if (nr > vc->vc_rows - vc->vc_y)
1540 nr = vc->vc_rows - vc->vc_y;
1541 else if (!nr)
1542 nr=1;
1543 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1544 vc->vc_need_wrap = 0;
1545 }
1546
1547 /* console_lock is held (except via vc_init->reset_terminal */
1548 static void save_cur(struct vc_data *vc)
1549 {
1550 vc->vc_saved_x = vc->vc_x;
1551 vc->vc_saved_y = vc->vc_y;
1552 vc->vc_s_intensity = vc->vc_intensity;
1553 vc->vc_s_italic = vc->vc_italic;
1554 vc->vc_s_underline = vc->vc_underline;
1555 vc->vc_s_blink = vc->vc_blink;
1556 vc->vc_s_reverse = vc->vc_reverse;
1557 vc->vc_s_charset = vc->vc_charset;
1558 vc->vc_s_color = vc->vc_color;
1559 vc->vc_saved_G0 = vc->vc_G0_charset;
1560 vc->vc_saved_G1 = vc->vc_G1_charset;
1561 }
1562
1563 /* console_lock is held */
1564 static void restore_cur(struct vc_data *vc)
1565 {
1566 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1567 vc->vc_intensity = vc->vc_s_intensity;
1568 vc->vc_italic = vc->vc_s_italic;
1569 vc->vc_underline = vc->vc_s_underline;
1570 vc->vc_blink = vc->vc_s_blink;
1571 vc->vc_reverse = vc->vc_s_reverse;
1572 vc->vc_charset = vc->vc_s_charset;
1573 vc->vc_color = vc->vc_s_color;
1574 vc->vc_G0_charset = vc->vc_saved_G0;
1575 vc->vc_G1_charset = vc->vc_saved_G1;
1576 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1577 update_attr(vc);
1578 vc->vc_need_wrap = 0;
1579 }
1580
1581 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1582 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1583 ESpalette };
1584
1585 /* console_lock is held (except via vc_init()) */
1586 static void reset_terminal(struct vc_data *vc, int do_clear)
1587 {
1588 vc->vc_top = 0;
1589 vc->vc_bottom = vc->vc_rows;
1590 vc->vc_state = ESnormal;
1591 vc->vc_ques = 0;
1592 vc->vc_translate = set_translate(LAT1_MAP, vc);
1593 vc->vc_G0_charset = LAT1_MAP;
1594 vc->vc_G1_charset = GRAF_MAP;
1595 vc->vc_charset = 0;
1596 vc->vc_need_wrap = 0;
1597 vc->vc_report_mouse = 0;
1598 vc->vc_utf = default_utf8;
1599 vc->vc_utf_count = 0;
1600
1601 vc->vc_disp_ctrl = 0;
1602 vc->vc_toggle_meta = 0;
1603
1604 vc->vc_decscnm = 0;
1605 vc->vc_decom = 0;
1606 vc->vc_decawm = 1;
1607 vc->vc_deccm = global_cursor_default;
1608 vc->vc_decim = 0;
1609
1610 vt_reset_keyboard(vc->vc_num);
1611
1612 vc->vc_cursor_type = cur_default;
1613 vc->vc_complement_mask = vc->vc_s_complement_mask;
1614
1615 default_attr(vc);
1616 update_attr(vc);
1617
1618 vc->vc_tab_stop[0] = 0x01010100;
1619 vc->vc_tab_stop[1] =
1620 vc->vc_tab_stop[2] =
1621 vc->vc_tab_stop[3] =
1622 vc->vc_tab_stop[4] =
1623 vc->vc_tab_stop[5] =
1624 vc->vc_tab_stop[6] =
1625 vc->vc_tab_stop[7] = 0x01010101;
1626
1627 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1628 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1629
1630 gotoxy(vc, 0, 0);
1631 save_cur(vc);
1632 if (do_clear)
1633 csi_J(vc, 2);
1634 }
1635
1636 /* console_lock is held */
1637 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1638 {
1639 /*
1640 * Control characters can be used in the _middle_
1641 * of an escape sequence.
1642 */
1643 switch (c) {
1644 case 0:
1645 return;
1646 case 7:
1647 if (vc->vc_bell_duration)
1648 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1649 return;
1650 case 8:
1651 bs(vc);
1652 return;
1653 case 9:
1654 vc->vc_pos -= (vc->vc_x << 1);
1655 while (vc->vc_x < vc->vc_cols - 1) {
1656 vc->vc_x++;
1657 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1658 break;
1659 }
1660 vc->vc_pos += (vc->vc_x << 1);
1661 notify_write(vc, '\t');
1662 return;
1663 case 10: case 11: case 12:
1664 lf(vc);
1665 if (!is_kbd(vc, lnm))
1666 return;
1667 case 13:
1668 cr(vc);
1669 return;
1670 case 14:
1671 vc->vc_charset = 1;
1672 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1673 vc->vc_disp_ctrl = 1;
1674 return;
1675 case 15:
1676 vc->vc_charset = 0;
1677 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1678 vc->vc_disp_ctrl = 0;
1679 return;
1680 case 24: case 26:
1681 vc->vc_state = ESnormal;
1682 return;
1683 case 27:
1684 vc->vc_state = ESesc;
1685 return;
1686 case 127:
1687 del(vc);
1688 return;
1689 case 128+27:
1690 vc->vc_state = ESsquare;
1691 return;
1692 }
1693 switch(vc->vc_state) {
1694 case ESesc:
1695 vc->vc_state = ESnormal;
1696 switch (c) {
1697 case '[':
1698 vc->vc_state = ESsquare;
1699 return;
1700 case ']':
1701 vc->vc_state = ESnonstd;
1702 return;
1703 case '%':
1704 vc->vc_state = ESpercent;
1705 return;
1706 case 'E':
1707 cr(vc);
1708 lf(vc);
1709 return;
1710 case 'M':
1711 ri(vc);
1712 return;
1713 case 'D':
1714 lf(vc);
1715 return;
1716 case 'H':
1717 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1718 return;
1719 case 'Z':
1720 respond_ID(tty);
1721 return;
1722 case '7':
1723 save_cur(vc);
1724 return;
1725 case '8':
1726 restore_cur(vc);
1727 return;
1728 case '(':
1729 vc->vc_state = ESsetG0;
1730 return;
1731 case ')':
1732 vc->vc_state = ESsetG1;
1733 return;
1734 case '#':
1735 vc->vc_state = EShash;
1736 return;
1737 case 'c':
1738 reset_terminal(vc, 1);
1739 return;
1740 case '>': /* Numeric keypad */
1741 clr_kbd(vc, kbdapplic);
1742 return;
1743 case '=': /* Appl. keypad */
1744 set_kbd(vc, kbdapplic);
1745 return;
1746 }
1747 return;
1748 case ESnonstd:
1749 if (c=='P') { /* palette escape sequence */
1750 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1751 vc->vc_par[vc->vc_npar] = 0;
1752 vc->vc_npar = 0;
1753 vc->vc_state = ESpalette;
1754 return;
1755 } else if (c=='R') { /* reset palette */
1756 reset_palette(vc);
1757 vc->vc_state = ESnormal;
1758 } else
1759 vc->vc_state = ESnormal;
1760 return;
1761 case ESpalette:
1762 if (isxdigit(c)) {
1763 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1764 if (vc->vc_npar == 7) {
1765 int i = vc->vc_par[0] * 3, j = 1;
1766 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1767 vc->vc_palette[i++] += vc->vc_par[j++];
1768 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1769 vc->vc_palette[i++] += vc->vc_par[j++];
1770 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1771 vc->vc_palette[i] += vc->vc_par[j];
1772 set_palette(vc);
1773 vc->vc_state = ESnormal;
1774 }
1775 } else
1776 vc->vc_state = ESnormal;
1777 return;
1778 case ESsquare:
1779 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1780 vc->vc_par[vc->vc_npar] = 0;
1781 vc->vc_npar = 0;
1782 vc->vc_state = ESgetpars;
1783 if (c == '[') { /* Function key */
1784 vc->vc_state=ESfunckey;
1785 return;
1786 }
1787 vc->vc_ques = (c == '?');
1788 if (vc->vc_ques)
1789 return;
1790 case ESgetpars:
1791 if (c == ';' && vc->vc_npar < NPAR - 1) {
1792 vc->vc_npar++;
1793 return;
1794 } else if (c>='0' && c<='9') {
1795 vc->vc_par[vc->vc_npar] *= 10;
1796 vc->vc_par[vc->vc_npar] += c - '0';
1797 return;
1798 } else
1799 vc->vc_state = ESgotpars;
1800 case ESgotpars:
1801 vc->vc_state = ESnormal;
1802 switch(c) {
1803 case 'h':
1804 set_mode(vc, 1);
1805 return;
1806 case 'l':
1807 set_mode(vc, 0);
1808 return;
1809 case 'c':
1810 if (vc->vc_ques) {
1811 if (vc->vc_par[0])
1812 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1813 else
1814 vc->vc_cursor_type = cur_default;
1815 return;
1816 }
1817 break;
1818 case 'm':
1819 if (vc->vc_ques) {
1820 clear_selection();
1821 if (vc->vc_par[0])
1822 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1823 else
1824 vc->vc_complement_mask = vc->vc_s_complement_mask;
1825 return;
1826 }
1827 break;
1828 case 'n':
1829 if (!vc->vc_ques) {
1830 if (vc->vc_par[0] == 5)
1831 status_report(tty);
1832 else if (vc->vc_par[0] == 6)
1833 cursor_report(vc, tty);
1834 }
1835 return;
1836 }
1837 if (vc->vc_ques) {
1838 vc->vc_ques = 0;
1839 return;
1840 }
1841 switch(c) {
1842 case 'G': case '`':
1843 if (vc->vc_par[0])
1844 vc->vc_par[0]--;
1845 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1846 return;
1847 case 'A':
1848 if (!vc->vc_par[0])
1849 vc->vc_par[0]++;
1850 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1851 return;
1852 case 'B': case 'e':
1853 if (!vc->vc_par[0])
1854 vc->vc_par[0]++;
1855 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1856 return;
1857 case 'C': case 'a':
1858 if (!vc->vc_par[0])
1859 vc->vc_par[0]++;
1860 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1861 return;
1862 case 'D':
1863 if (!vc->vc_par[0])
1864 vc->vc_par[0]++;
1865 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1866 return;
1867 case 'E':
1868 if (!vc->vc_par[0])
1869 vc->vc_par[0]++;
1870 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1871 return;
1872 case 'F':
1873 if (!vc->vc_par[0])
1874 vc->vc_par[0]++;
1875 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1876 return;
1877 case 'd':
1878 if (vc->vc_par[0])
1879 vc->vc_par[0]--;
1880 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1881 return;
1882 case 'H': case 'f':
1883 if (vc->vc_par[0])
1884 vc->vc_par[0]--;
1885 if (vc->vc_par[1])
1886 vc->vc_par[1]--;
1887 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1888 return;
1889 case 'J':
1890 csi_J(vc, vc->vc_par[0]);
1891 return;
1892 case 'K':
1893 csi_K(vc, vc->vc_par[0]);
1894 return;
1895 case 'L':
1896 csi_L(vc, vc->vc_par[0]);
1897 return;
1898 case 'M':
1899 csi_M(vc, vc->vc_par[0]);
1900 return;
1901 case 'P':
1902 csi_P(vc, vc->vc_par[0]);
1903 return;
1904 case 'c':
1905 if (!vc->vc_par[0])
1906 respond_ID(tty);
1907 return;
1908 case 'g':
1909 if (!vc->vc_par[0])
1910 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1911 else if (vc->vc_par[0] == 3) {
1912 vc->vc_tab_stop[0] =
1913 vc->vc_tab_stop[1] =
1914 vc->vc_tab_stop[2] =
1915 vc->vc_tab_stop[3] =
1916 vc->vc_tab_stop[4] =
1917 vc->vc_tab_stop[5] =
1918 vc->vc_tab_stop[6] =
1919 vc->vc_tab_stop[7] = 0;
1920 }
1921 return;
1922 case 'm':
1923 csi_m(vc);
1924 return;
1925 case 'q': /* DECLL - but only 3 leds */
1926 /* map 0,1,2,3 to 0,1,2,4 */
1927 if (vc->vc_par[0] < 4)
1928 vt_set_led_state(vc->vc_num,
1929 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1930 return;
1931 case 'r':
1932 if (!vc->vc_par[0])
1933 vc->vc_par[0]++;
1934 if (!vc->vc_par[1])
1935 vc->vc_par[1] = vc->vc_rows;
1936 /* Minimum allowed region is 2 lines */
1937 if (vc->vc_par[0] < vc->vc_par[1] &&
1938 vc->vc_par[1] <= vc->vc_rows) {
1939 vc->vc_top = vc->vc_par[0] - 1;
1940 vc->vc_bottom = vc->vc_par[1];
1941 gotoxay(vc, 0, 0);
1942 }
1943 return;
1944 case 's':
1945 save_cur(vc);
1946 return;
1947 case 'u':
1948 restore_cur(vc);
1949 return;
1950 case 'X':
1951 csi_X(vc, vc->vc_par[0]);
1952 return;
1953 case '@':
1954 csi_at(vc, vc->vc_par[0]);
1955 return;
1956 case ']': /* setterm functions */
1957 setterm_command(vc);
1958 return;
1959 }
1960 return;
1961 case ESpercent:
1962 vc->vc_state = ESnormal;
1963 switch (c) {
1964 case '@': /* defined in ISO 2022 */
1965 vc->vc_utf = 0;
1966 return;
1967 case 'G': /* prelim official escape code */
1968 case '8': /* retained for compatibility */
1969 vc->vc_utf = 1;
1970 return;
1971 }
1972 return;
1973 case ESfunckey:
1974 vc->vc_state = ESnormal;
1975 return;
1976 case EShash:
1977 vc->vc_state = ESnormal;
1978 if (c == '8') {
1979 /* DEC screen alignment test. kludge :-) */
1980 vc->vc_video_erase_char =
1981 (vc->vc_video_erase_char & 0xff00) | 'E';
1982 csi_J(vc, 2);
1983 vc->vc_video_erase_char =
1984 (vc->vc_video_erase_char & 0xff00) | ' ';
1985 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1986 }
1987 return;
1988 case ESsetG0:
1989 if (c == '0')
1990 vc->vc_G0_charset = GRAF_MAP;
1991 else if (c == 'B')
1992 vc->vc_G0_charset = LAT1_MAP;
1993 else if (c == 'U')
1994 vc->vc_G0_charset = IBMPC_MAP;
1995 else if (c == 'K')
1996 vc->vc_G0_charset = USER_MAP;
1997 if (vc->vc_charset == 0)
1998 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1999 vc->vc_state = ESnormal;
2000 return;
2001 case ESsetG1:
2002 if (c == '0')
2003 vc->vc_G1_charset = GRAF_MAP;
2004 else if (c == 'B')
2005 vc->vc_G1_charset = LAT1_MAP;
2006 else if (c == 'U')
2007 vc->vc_G1_charset = IBMPC_MAP;
2008 else if (c == 'K')
2009 vc->vc_G1_charset = USER_MAP;
2010 if (vc->vc_charset == 1)
2011 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2012 vc->vc_state = ESnormal;
2013 return;
2014 default:
2015 vc->vc_state = ESnormal;
2016 }
2017 }
2018
2019 /* is_double_width() is based on the wcwidth() implementation by
2020 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2021 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2022 */
2023 struct interval {
2024 uint32_t first;
2025 uint32_t last;
2026 };
2027
2028 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2029 {
2030 int min = 0;
2031 int mid;
2032
2033 if (ucs < table[0].first || ucs > table[max].last)
2034 return 0;
2035 while (max >= min) {
2036 mid = (min + max) / 2;
2037 if (ucs > table[mid].last)
2038 min = mid + 1;
2039 else if (ucs < table[mid].first)
2040 max = mid - 1;
2041 else
2042 return 1;
2043 }
2044 return 0;
2045 }
2046
2047 static int is_double_width(uint32_t ucs)
2048 {
2049 static const struct interval double_width[] = {
2050 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2051 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2052 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2053 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2054 };
2055 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2056 }
2057
2058 /* acquires console_lock */
2059 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2060 {
2061 #ifdef VT_BUF_VRAM_ONLY
2062 #define FLUSH do { } while(0);
2063 #else
2064 #define FLUSH if (draw_x >= 0) { \
2065 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2066 draw_x = -1; \
2067 }
2068 #endif
2069
2070 int c, tc, ok, n = 0, draw_x = -1;
2071 unsigned int currcons;
2072 unsigned long draw_from = 0, draw_to = 0;
2073 struct vc_data *vc;
2074 unsigned char vc_attr;
2075 struct vt_notifier_param param;
2076 uint8_t rescan;
2077 uint8_t inverse;
2078 uint8_t width;
2079 u16 himask, charmask;
2080
2081 if (in_interrupt())
2082 return count;
2083
2084 might_sleep();
2085
2086 console_lock();
2087 vc = tty->driver_data;
2088 if (vc == NULL) {
2089 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2090 console_unlock();
2091 return 0;
2092 }
2093
2094 currcons = vc->vc_num;
2095 if (!vc_cons_allocated(currcons)) {
2096 /* could this happen? */
2097 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2098 console_unlock();
2099 return 0;
2100 }
2101
2102 himask = vc->vc_hi_font_mask;
2103 charmask = himask ? 0x1ff : 0xff;
2104
2105 /* undraw cursor first */
2106 if (IS_FG(vc))
2107 hide_cursor(vc);
2108
2109 param.vc = vc;
2110
2111 while (!tty->stopped && count) {
2112 int orig = *buf;
2113 c = orig;
2114 buf++;
2115 n++;
2116 count--;
2117 rescan = 0;
2118 inverse = 0;
2119 width = 1;
2120
2121 /* Do no translation at all in control states */
2122 if (vc->vc_state != ESnormal) {
2123 tc = c;
2124 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2125 /* Combine UTF-8 into Unicode in vc_utf_char.
2126 * vc_utf_count is the number of continuation bytes still
2127 * expected to arrive.
2128 * vc_npar is the number of continuation bytes arrived so
2129 * far
2130 */
2131 rescan_last_byte:
2132 if ((c & 0xc0) == 0x80) {
2133 /* Continuation byte received */
2134 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2135 if (vc->vc_utf_count) {
2136 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2137 vc->vc_npar++;
2138 if (--vc->vc_utf_count) {
2139 /* Still need some bytes */
2140 continue;
2141 }
2142 /* Got a whole character */
2143 c = vc->vc_utf_char;
2144 /* Reject overlong sequences */
2145 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2146 c > utf8_length_changes[vc->vc_npar])
2147 c = 0xfffd;
2148 } else {
2149 /* Unexpected continuation byte */
2150 vc->vc_utf_count = 0;
2151 c = 0xfffd;
2152 }
2153 } else {
2154 /* Single ASCII byte or first byte of a sequence received */
2155 if (vc->vc_utf_count) {
2156 /* Continuation byte expected */
2157 rescan = 1;
2158 vc->vc_utf_count = 0;
2159 c = 0xfffd;
2160 } else if (c > 0x7f) {
2161 /* First byte of a multibyte sequence received */
2162 vc->vc_npar = 0;
2163 if ((c & 0xe0) == 0xc0) {
2164 vc->vc_utf_count = 1;
2165 vc->vc_utf_char = (c & 0x1f);
2166 } else if ((c & 0xf0) == 0xe0) {
2167 vc->vc_utf_count = 2;
2168 vc->vc_utf_char = (c & 0x0f);
2169 } else if ((c & 0xf8) == 0xf0) {
2170 vc->vc_utf_count = 3;
2171 vc->vc_utf_char = (c & 0x07);
2172 } else if ((c & 0xfc) == 0xf8) {
2173 vc->vc_utf_count = 4;
2174 vc->vc_utf_char = (c & 0x03);
2175 } else if ((c & 0xfe) == 0xfc) {
2176 vc->vc_utf_count = 5;
2177 vc->vc_utf_char = (c & 0x01);
2178 } else {
2179 /* 254 and 255 are invalid */
2180 c = 0xfffd;
2181 }
2182 if (vc->vc_utf_count) {
2183 /* Still need some bytes */
2184 continue;
2185 }
2186 }
2187 /* Nothing to do if an ASCII byte was received */
2188 }
2189 /* End of UTF-8 decoding. */
2190 /* c is the received character, or U+FFFD for invalid sequences. */
2191 /* Replace invalid Unicode code points with U+FFFD too */
2192 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2193 c = 0xfffd;
2194 tc = c;
2195 } else { /* no utf or alternate charset mode */
2196 tc = vc_translate(vc, c);
2197 }
2198
2199 param.c = tc;
2200 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2201 &param) == NOTIFY_STOP)
2202 continue;
2203
2204 /* If the original code was a control character we
2205 * only allow a glyph to be displayed if the code is
2206 * not normally used (such as for cursor movement) or
2207 * if the disp_ctrl mode has been explicitly enabled.
2208 * Certain characters (as given by the CTRL_ALWAYS
2209 * bitmap) are always displayed as control characters,
2210 * as the console would be pretty useless without
2211 * them; to display an arbitrary font position use the
2212 * direct-to-font zone in UTF-8 mode.
2213 */
2214 ok = tc && (c >= 32 ||
2215 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2216 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2217 && (c != 127 || vc->vc_disp_ctrl)
2218 && (c != 128+27);
2219
2220 if (vc->vc_state == ESnormal && ok) {
2221 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2222 if (is_double_width(c))
2223 width = 2;
2224 }
2225 /* Now try to find out how to display it */
2226 tc = conv_uni_to_pc(vc, tc);
2227 if (tc & ~charmask) {
2228 if (tc == -1 || tc == -2) {
2229 continue; /* nothing to display */
2230 }
2231 /* Glyph not found */
2232 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2233 /* In legacy mode use the glyph we get by a 1:1 mapping.
2234 This would make absolutely no sense with Unicode in mind,
2235 but do this for ASCII characters since a font may lack
2236 Unicode mapping info and we don't want to end up with
2237 having question marks only. */
2238 tc = c;
2239 } else {
2240 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2241 tc = conv_uni_to_pc(vc, 0xfffd);
2242 if (tc < 0) {
2243 inverse = 1;
2244 tc = conv_uni_to_pc(vc, '?');
2245 if (tc < 0) tc = '?';
2246 }
2247 }
2248 }
2249
2250 if (!inverse) {
2251 vc_attr = vc->vc_attr;
2252 } else {
2253 /* invert vc_attr */
2254 if (!vc->vc_can_do_color) {
2255 vc_attr = (vc->vc_attr) ^ 0x08;
2256 } else if (vc->vc_hi_font_mask == 0x100) {
2257 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2258 } else {
2259 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2260 }
2261 FLUSH
2262 }
2263
2264 while (1) {
2265 if (vc->vc_need_wrap || vc->vc_decim)
2266 FLUSH
2267 if (vc->vc_need_wrap) {
2268 cr(vc);
2269 lf(vc);
2270 }
2271 if (vc->vc_decim)
2272 insert_char(vc, 1);
2273 scr_writew(himask ?
2274 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2275 (vc_attr << 8) + tc,
2276 (u16 *) vc->vc_pos);
2277 if (DO_UPDATE(vc) && draw_x < 0) {
2278 draw_x = vc->vc_x;
2279 draw_from = vc->vc_pos;
2280 }
2281 if (vc->vc_x == vc->vc_cols - 1) {
2282 vc->vc_need_wrap = vc->vc_decawm;
2283 draw_to = vc->vc_pos + 2;
2284 } else {
2285 vc->vc_x++;
2286 draw_to = (vc->vc_pos += 2);
2287 }
2288
2289 if (!--width) break;
2290
2291 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2292 if (tc < 0) tc = ' ';
2293 }
2294 notify_write(vc, c);
2295
2296 if (inverse) {
2297 FLUSH
2298 }
2299
2300 if (rescan) {
2301 rescan = 0;
2302 inverse = 0;
2303 width = 1;
2304 c = orig;
2305 goto rescan_last_byte;
2306 }
2307 continue;
2308 }
2309 FLUSH
2310 do_con_trol(tty, vc, orig);
2311 }
2312 FLUSH
2313 console_conditional_schedule();
2314 console_unlock();
2315 notify_update(vc);
2316 return n;
2317 #undef FLUSH
2318 }
2319
2320 /*
2321 * This is the console switching callback.
2322 *
2323 * Doing console switching in a process context allows
2324 * us to do the switches asynchronously (needed when we want
2325 * to switch due to a keyboard interrupt). Synchronization
2326 * with other console code and prevention of re-entrancy is
2327 * ensured with console_lock.
2328 */
2329 static void console_callback(struct work_struct *ignored)
2330 {
2331 console_lock();
2332
2333 if (want_console >= 0) {
2334 if (want_console != fg_console &&
2335 vc_cons_allocated(want_console)) {
2336 hide_cursor(vc_cons[fg_console].d);
2337 change_console(vc_cons[want_console].d);
2338 /* we only changed when the console had already
2339 been allocated - a new console is not created
2340 in an interrupt routine */
2341 }
2342 want_console = -1;
2343 }
2344 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2345 do_poke_blanked_console = 0;
2346 poke_blanked_console();
2347 }
2348 if (scrollback_delta) {
2349 struct vc_data *vc = vc_cons[fg_console].d;
2350 clear_selection();
2351 if (vc->vc_mode == KD_TEXT)
2352 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2353 scrollback_delta = 0;
2354 }
2355 if (blank_timer_expired) {
2356 do_blank_screen(0);
2357 blank_timer_expired = 0;
2358 }
2359 notify_update(vc_cons[fg_console].d);
2360
2361 console_unlock();
2362 }
2363
2364 int set_console(int nr)
2365 {
2366 struct vc_data *vc = vc_cons[fg_console].d;
2367
2368 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2369 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2370
2371 /*
2372 * Console switch will fail in console_callback() or
2373 * change_console() so there is no point scheduling
2374 * the callback
2375 *
2376 * Existing set_console() users don't check the return
2377 * value so this shouldn't break anything
2378 */
2379 return -EINVAL;
2380 }
2381
2382 want_console = nr;
2383 schedule_console_callback();
2384
2385 return 0;
2386 }
2387
2388 struct tty_driver *console_driver;
2389
2390 #ifdef CONFIG_VT_CONSOLE
2391
2392 /**
2393 * vt_kmsg_redirect() - Sets/gets the kernel message console
2394 * @new: The new virtual terminal number or -1 if the console should stay
2395 * unchanged
2396 *
2397 * By default, the kernel messages are always printed on the current virtual
2398 * console. However, the user may modify that default with the
2399 * TIOCL_SETKMSGREDIRECT ioctl call.
2400 *
2401 * This function sets the kernel message console to be @new. It returns the old
2402 * virtual console number. The virtual terminal number 0 (both as parameter and
2403 * return value) means no redirection (i.e. always printed on the currently
2404 * active console).
2405 *
2406 * The parameter -1 means that only the current console is returned, but the
2407 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2408 * case to make the code more understandable.
2409 *
2410 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2411 * the parameter and always returns 0.
2412 */
2413 int vt_kmsg_redirect(int new)
2414 {
2415 static int kmsg_con;
2416
2417 if (new != -1)
2418 return xchg(&kmsg_con, new);
2419 else
2420 return kmsg_con;
2421 }
2422
2423 /*
2424 * Console on virtual terminal
2425 *
2426 * The console must be locked when we get here.
2427 */
2428
2429 static void vt_console_print(struct console *co, const char *b, unsigned count)
2430 {
2431 struct vc_data *vc = vc_cons[fg_console].d;
2432 unsigned char c;
2433 static DEFINE_SPINLOCK(printing_lock);
2434 const ushort *start;
2435 ushort cnt = 0;
2436 ushort myx;
2437 int kmsg_console;
2438
2439 /* console busy or not yet initialized */
2440 if (!printable)
2441 return;
2442 if (!spin_trylock(&printing_lock))
2443 return;
2444
2445 kmsg_console = vt_get_kmsg_redirect();
2446 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2447 vc = vc_cons[kmsg_console - 1].d;
2448
2449 /* read `x' only after setting currcons properly (otherwise
2450 the `x' macro will read the x of the foreground console). */
2451 myx = vc->vc_x;
2452
2453 if (!vc_cons_allocated(fg_console)) {
2454 /* impossible */
2455 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2456 goto quit;
2457 }
2458
2459 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2460 goto quit;
2461
2462 /* undraw cursor first */
2463 if (IS_FG(vc))
2464 hide_cursor(vc);
2465
2466 start = (ushort *)vc->vc_pos;
2467
2468 /* Contrived structure to try to emulate original need_wrap behaviour
2469 * Problems caused when we have need_wrap set on '\n' character */
2470 while (count--) {
2471 c = *b++;
2472 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2473 if (cnt > 0) {
2474 if (CON_IS_VISIBLE(vc))
2475 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2476 vc->vc_x += cnt;
2477 if (vc->vc_need_wrap)
2478 vc->vc_x--;
2479 cnt = 0;
2480 }
2481 if (c == 8) { /* backspace */
2482 bs(vc);
2483 start = (ushort *)vc->vc_pos;
2484 myx = vc->vc_x;
2485 continue;
2486 }
2487 if (c != 13)
2488 lf(vc);
2489 cr(vc);
2490 start = (ushort *)vc->vc_pos;
2491 myx = vc->vc_x;
2492 if (c == 10 || c == 13)
2493 continue;
2494 }
2495 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2496 notify_write(vc, c);
2497 cnt++;
2498 if (myx == vc->vc_cols - 1) {
2499 vc->vc_need_wrap = 1;
2500 continue;
2501 }
2502 vc->vc_pos += 2;
2503 myx++;
2504 }
2505 if (cnt > 0) {
2506 if (CON_IS_VISIBLE(vc))
2507 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2508 vc->vc_x += cnt;
2509 if (vc->vc_x == vc->vc_cols) {
2510 vc->vc_x--;
2511 vc->vc_need_wrap = 1;
2512 }
2513 }
2514 set_cursor(vc);
2515 notify_update(vc);
2516
2517 quit:
2518 spin_unlock(&printing_lock);
2519 }
2520
2521 static struct tty_driver *vt_console_device(struct console *c, int *index)
2522 {
2523 *index = c->index ? c->index-1 : fg_console;
2524 return console_driver;
2525 }
2526
2527 static struct console vt_console_driver = {
2528 .name = "tty",
2529 .write = vt_console_print,
2530 .device = vt_console_device,
2531 .unblank = unblank_screen,
2532 .flags = CON_PRINTBUFFER,
2533 .index = -1,
2534 };
2535 #endif
2536
2537 /*
2538 * Handling of Linux-specific VC ioctls
2539 */
2540
2541 /*
2542 * Generally a bit racy with respect to console_lock();.
2543 *
2544 * There are some functions which don't need it.
2545 *
2546 * There are some functions which can sleep for arbitrary periods
2547 * (paste_selection) but we don't need the lock there anyway.
2548 *
2549 * set_selection has locking, and definitely needs it
2550 */
2551
2552 int tioclinux(struct tty_struct *tty, unsigned long arg)
2553 {
2554 char type, data;
2555 char __user *p = (char __user *)arg;
2556 int lines;
2557 int ret;
2558
2559 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2560 return -EPERM;
2561 if (get_user(type, p))
2562 return -EFAULT;
2563 ret = 0;
2564
2565 switch (type)
2566 {
2567 case TIOCL_SETSEL:
2568 console_lock();
2569 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2570 console_unlock();
2571 break;
2572 case TIOCL_PASTESEL:
2573 ret = paste_selection(tty);
2574 break;
2575 case TIOCL_UNBLANKSCREEN:
2576 console_lock();
2577 unblank_screen();
2578 console_unlock();
2579 break;
2580 case TIOCL_SELLOADLUT:
2581 console_lock();
2582 ret = sel_loadlut(p);
2583 console_unlock();
2584 break;
2585 case TIOCL_GETSHIFTSTATE:
2586
2587 /*
2588 * Make it possible to react to Shift+Mousebutton.
2589 * Note that 'shift_state' is an undocumented
2590 * kernel-internal variable; programs not closely
2591 * related to the kernel should not use this.
2592 */
2593 data = vt_get_shift_state();
2594 ret = __put_user(data, p);
2595 break;
2596 case TIOCL_GETMOUSEREPORTING:
2597 console_lock(); /* May be overkill */
2598 data = mouse_reporting();
2599 console_unlock();
2600 ret = __put_user(data, p);
2601 break;
2602 case TIOCL_SETVESABLANK:
2603 console_lock();
2604 ret = set_vesa_blanking(p);
2605 console_unlock();
2606 break;
2607 case TIOCL_GETKMSGREDIRECT:
2608 data = vt_get_kmsg_redirect();
2609 ret = __put_user(data, p);
2610 break;
2611 case TIOCL_SETKMSGREDIRECT:
2612 if (!capable(CAP_SYS_ADMIN)) {
2613 ret = -EPERM;
2614 } else {
2615 if (get_user(data, p+1))
2616 ret = -EFAULT;
2617 else
2618 vt_kmsg_redirect(data);
2619 }
2620 break;
2621 case TIOCL_GETFGCONSOLE:
2622 /* No locking needed as this is a transiently
2623 correct return anyway if the caller hasn't
2624 disabled switching */
2625 ret = fg_console;
2626 break;
2627 case TIOCL_SCROLLCONSOLE:
2628 if (get_user(lines, (s32 __user *)(p+4))) {
2629 ret = -EFAULT;
2630 } else {
2631 /* Need the console lock here. Note that lots
2632 of other calls need fixing before the lock
2633 is actually useful ! */
2634 console_lock();
2635 scrollfront(vc_cons[fg_console].d, lines);
2636 console_unlock();
2637 ret = 0;
2638 }
2639 break;
2640 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2641 console_lock();
2642 ignore_poke = 1;
2643 do_blank_screen(0);
2644 console_unlock();
2645 break;
2646 case TIOCL_BLANKEDSCREEN:
2647 ret = console_blanked;
2648 break;
2649 default:
2650 ret = -EINVAL;
2651 break;
2652 }
2653 return ret;
2654 }
2655
2656 /*
2657 * /dev/ttyN handling
2658 */
2659
2660 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2661 {
2662 int retval;
2663
2664 retval = do_con_write(tty, buf, count);
2665 con_flush_chars(tty);
2666
2667 return retval;
2668 }
2669
2670 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2671 {
2672 if (in_interrupt())
2673 return 0; /* n_r3964 calls put_char() from interrupt context */
2674 return do_con_write(tty, &ch, 1);
2675 }
2676
2677 static int con_write_room(struct tty_struct *tty)
2678 {
2679 if (tty->stopped)
2680 return 0;
2681 return 32768; /* No limit, really; we're not buffering */
2682 }
2683
2684 static int con_chars_in_buffer(struct tty_struct *tty)
2685 {
2686 return 0; /* we're not buffering */
2687 }
2688
2689 /*
2690 * con_throttle and con_unthrottle are only used for
2691 * paste_selection(), which has to stuff in a large number of
2692 * characters...
2693 */
2694 static void con_throttle(struct tty_struct *tty)
2695 {
2696 }
2697
2698 static void con_unthrottle(struct tty_struct *tty)
2699 {
2700 struct vc_data *vc = tty->driver_data;
2701
2702 wake_up_interruptible(&vc->paste_wait);
2703 }
2704
2705 /*
2706 * Turn the Scroll-Lock LED on when the tty is stopped
2707 */
2708 static void con_stop(struct tty_struct *tty)
2709 {
2710 int console_num;
2711 if (!tty)
2712 return;
2713 console_num = tty->index;
2714 if (!vc_cons_allocated(console_num))
2715 return;
2716 vt_kbd_con_stop(console_num);
2717 }
2718
2719 /*
2720 * Turn the Scroll-Lock LED off when the console is started
2721 */
2722 static void con_start(struct tty_struct *tty)
2723 {
2724 int console_num;
2725 if (!tty)
2726 return;
2727 console_num = tty->index;
2728 if (!vc_cons_allocated(console_num))
2729 return;
2730 vt_kbd_con_start(console_num);
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 console_lock();
2742 vc = tty->driver_data;
2743 if (vc)
2744 set_cursor(vc);
2745 console_unlock();
2746 }
2747
2748 /*
2749 * Allocate the console screen memory.
2750 */
2751 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2752 {
2753 unsigned int currcons = tty->index;
2754 struct vc_data *vc;
2755 int ret;
2756
2757 console_lock();
2758 ret = vc_allocate(currcons);
2759 if (ret)
2760 goto unlock;
2761
2762 vc = vc_cons[currcons].d;
2763
2764 /* Still being freed */
2765 if (vc->port.tty) {
2766 ret = -ERESTARTSYS;
2767 goto unlock;
2768 }
2769
2770 ret = tty_port_install(&vc->port, driver, tty);
2771 if (ret)
2772 goto unlock;
2773
2774 tty->driver_data = vc;
2775 vc->port.tty = tty;
2776
2777 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2778 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2779 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2780 }
2781 if (vc->vc_utf)
2782 tty->termios.c_iflag |= IUTF8;
2783 else
2784 tty->termios.c_iflag &= ~IUTF8;
2785 unlock:
2786 console_unlock();
2787 return ret;
2788 }
2789
2790 static int con_open(struct tty_struct *tty, struct file *filp)
2791 {
2792 /* everything done in install */
2793 return 0;
2794 }
2795
2796
2797 static void con_close(struct tty_struct *tty, struct file *filp)
2798 {
2799 /* Nothing to do - we defer to shutdown */
2800 }
2801
2802 static void con_shutdown(struct tty_struct *tty)
2803 {
2804 struct vc_data *vc = tty->driver_data;
2805 BUG_ON(vc == NULL);
2806 console_lock();
2807 vc->port.tty = NULL;
2808 console_unlock();
2809 }
2810
2811 static int default_italic_color = 2; // green (ASCII)
2812 static int default_underline_color = 3; // cyan (ASCII)
2813 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2814 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2815
2816 static void vc_init(struct vc_data *vc, unsigned int rows,
2817 unsigned int cols, int do_clear)
2818 {
2819 int j, k ;
2820
2821 vc->vc_cols = cols;
2822 vc->vc_rows = rows;
2823 vc->vc_size_row = cols << 1;
2824 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2825
2826 set_origin(vc);
2827 vc->vc_pos = vc->vc_origin;
2828 reset_vc(vc);
2829 for (j=k=0; j<16; j++) {
2830 vc->vc_palette[k++] = default_red[j] ;
2831 vc->vc_palette[k++] = default_grn[j] ;
2832 vc->vc_palette[k++] = default_blu[j] ;
2833 }
2834 vc->vc_def_color = 0x07; /* white */
2835 vc->vc_ulcolor = default_underline_color;
2836 vc->vc_itcolor = default_italic_color;
2837 vc->vc_halfcolor = 0x08; /* grey */
2838 init_waitqueue_head(&vc->paste_wait);
2839 reset_terminal(vc, do_clear);
2840 }
2841
2842 /*
2843 * This routine initializes console interrupts, and does nothing
2844 * else. If you want the screen to clear, call tty_write with
2845 * the appropriate escape-sequence.
2846 */
2847
2848 static int __init con_init(void)
2849 {
2850 const char *display_desc = NULL;
2851 struct vc_data *vc;
2852 unsigned int currcons = 0, i;
2853
2854 console_lock();
2855
2856 if (conswitchp)
2857 display_desc = conswitchp->con_startup();
2858 if (!display_desc) {
2859 fg_console = 0;
2860 console_unlock();
2861 return 0;
2862 }
2863
2864 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2865 struct con_driver *con_driver = &registered_con_driver[i];
2866
2867 if (con_driver->con == NULL) {
2868 con_driver->con = conswitchp;
2869 con_driver->desc = display_desc;
2870 con_driver->flag = CON_DRIVER_FLAG_INIT;
2871 con_driver->first = 0;
2872 con_driver->last = MAX_NR_CONSOLES - 1;
2873 break;
2874 }
2875 }
2876
2877 for (i = 0; i < MAX_NR_CONSOLES; i++)
2878 con_driver_map[i] = conswitchp;
2879
2880 if (blankinterval) {
2881 blank_state = blank_normal_wait;
2882 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2883 }
2884
2885 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2886 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2887 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2888 tty_port_init(&vc->port);
2889 visual_init(vc, currcons, 1);
2890 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2891 vc_init(vc, vc->vc_rows, vc->vc_cols,
2892 currcons || !vc->vc_sw->con_save_screen);
2893 }
2894 currcons = fg_console = 0;
2895 master_display_fg = vc = vc_cons[currcons].d;
2896 set_origin(vc);
2897 save_screen(vc);
2898 gotoxy(vc, vc->vc_x, vc->vc_y);
2899 csi_J(vc, 0);
2900 update_screen(vc);
2901 pr_info("Console: %s %s %dx%d\n",
2902 vc->vc_can_do_color ? "colour" : "mono",
2903 display_desc, vc->vc_cols, vc->vc_rows);
2904 printable = 1;
2905
2906 console_unlock();
2907
2908 #ifdef CONFIG_VT_CONSOLE
2909 register_console(&vt_console_driver);
2910 #endif
2911 return 0;
2912 }
2913 console_initcall(con_init);
2914
2915 static const struct tty_operations con_ops = {
2916 .install = con_install,
2917 .open = con_open,
2918 .close = con_close,
2919 .write = con_write,
2920 .write_room = con_write_room,
2921 .put_char = con_put_char,
2922 .flush_chars = con_flush_chars,
2923 .chars_in_buffer = con_chars_in_buffer,
2924 .ioctl = vt_ioctl,
2925 #ifdef CONFIG_COMPAT
2926 .compat_ioctl = vt_compat_ioctl,
2927 #endif
2928 .stop = con_stop,
2929 .start = con_start,
2930 .throttle = con_throttle,
2931 .unthrottle = con_unthrottle,
2932 .resize = vt_resize,
2933 .shutdown = con_shutdown
2934 };
2935
2936 static struct cdev vc0_cdev;
2937
2938 static ssize_t show_tty_active(struct device *dev,
2939 struct device_attribute *attr, char *buf)
2940 {
2941 return sprintf(buf, "tty%d\n", fg_console + 1);
2942 }
2943 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2944
2945 int __init vty_init(const struct file_operations *console_fops)
2946 {
2947 cdev_init(&vc0_cdev, console_fops);
2948 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2949 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2950 panic("Couldn't register /dev/tty0 driver\n");
2951 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2952 if (IS_ERR(tty0dev))
2953 tty0dev = NULL;
2954 else
2955 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2956
2957 vcs_init();
2958
2959 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2960 if (!console_driver)
2961 panic("Couldn't allocate console driver\n");
2962
2963 console_driver->name = "tty";
2964 console_driver->name_base = 1;
2965 console_driver->major = TTY_MAJOR;
2966 console_driver->minor_start = 1;
2967 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2968 console_driver->init_termios = tty_std_termios;
2969 if (default_utf8)
2970 console_driver->init_termios.c_iflag |= IUTF8;
2971 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2972 tty_set_operations(console_driver, &con_ops);
2973 if (tty_register_driver(console_driver))
2974 panic("Couldn't register console driver\n");
2975 kbd_init();
2976 console_map_init();
2977 #ifdef CONFIG_MDA_CONSOLE
2978 mda_console_init();
2979 #endif
2980 return 0;
2981 }
2982
2983 #ifndef VT_SINGLE_DRIVER
2984
2985 static struct class *vtconsole_class;
2986
2987 static int bind_con_driver(const struct consw *csw, int first, int last,
2988 int deflt)
2989 {
2990 struct module *owner = csw->owner;
2991 const char *desc = NULL;
2992 struct con_driver *con_driver;
2993 int i, j = -1, k = -1, retval = -ENODEV;
2994
2995 if (!try_module_get(owner))
2996 return -ENODEV;
2997
2998 console_lock();
2999
3000 /* check if driver is registered */
3001 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3002 con_driver = &registered_con_driver[i];
3003
3004 if (con_driver->con == csw) {
3005 desc = con_driver->desc;
3006 retval = 0;
3007 break;
3008 }
3009 }
3010
3011 if (retval)
3012 goto err;
3013
3014 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3015 csw->con_startup();
3016 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3017 }
3018
3019 if (deflt) {
3020 if (conswitchp)
3021 module_put(conswitchp->owner);
3022
3023 __module_get(owner);
3024 conswitchp = csw;
3025 }
3026
3027 first = max(first, con_driver->first);
3028 last = min(last, con_driver->last);
3029
3030 for (i = first; i <= last; i++) {
3031 int old_was_color;
3032 struct vc_data *vc = vc_cons[i].d;
3033
3034 if (con_driver_map[i])
3035 module_put(con_driver_map[i]->owner);
3036 __module_get(owner);
3037 con_driver_map[i] = csw;
3038
3039 if (!vc || !vc->vc_sw)
3040 continue;
3041
3042 j = i;
3043
3044 if (CON_IS_VISIBLE(vc)) {
3045 k = i;
3046 save_screen(vc);
3047 }
3048
3049 old_was_color = vc->vc_can_do_color;
3050 vc->vc_sw->con_deinit(vc);
3051 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3052 visual_init(vc, i, 0);
3053 set_origin(vc);
3054 update_attr(vc);
3055
3056 /* If the console changed between mono <-> color, then
3057 * the attributes in the screenbuf will be wrong. The
3058 * following resets all attributes to something sane.
3059 */
3060 if (old_was_color != vc->vc_can_do_color)
3061 clear_buffer_attributes(vc);
3062 }
3063
3064 pr_info("Console: switching ");
3065 if (!deflt)
3066 printk("consoles %d-%d ", first+1, last+1);
3067 if (j >= 0) {
3068 struct vc_data *vc = vc_cons[j].d;
3069
3070 printk("to %s %s %dx%d\n",
3071 vc->vc_can_do_color ? "colour" : "mono",
3072 desc, vc->vc_cols, vc->vc_rows);
3073
3074 if (k >= 0) {
3075 vc = vc_cons[k].d;
3076 update_screen(vc);
3077 }
3078 } else
3079 printk("to %s\n", desc);
3080
3081 retval = 0;
3082 err:
3083 console_unlock();
3084 module_put(owner);
3085 return retval;
3086 };
3087
3088 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3089 static int con_is_graphics(const struct consw *csw, int first, int last)
3090 {
3091 int i, retval = 0;
3092
3093 for (i = first; i <= last; i++) {
3094 struct vc_data *vc = vc_cons[i].d;
3095
3096 if (vc && vc->vc_mode == KD_GRAPHICS) {
3097 retval = 1;
3098 break;
3099 }
3100 }
3101
3102 return retval;
3103 }
3104
3105 /**
3106 * unbind_con_driver - unbind a console driver
3107 * @csw: pointer to console driver to unregister
3108 * @first: first in range of consoles that @csw should be unbound from
3109 * @last: last in range of consoles that @csw should be unbound from
3110 * @deflt: should next bound console driver be default after @csw is unbound?
3111 *
3112 * To unbind a driver from all possible consoles, pass 0 as @first and
3113 * %MAX_NR_CONSOLES as @last.
3114 *
3115 * @deflt controls whether the console that ends up replacing @csw should be
3116 * the default console.
3117 *
3118 * RETURNS:
3119 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3120 * or 0 on success.
3121 */
3122 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3123 {
3124 struct module *owner = csw->owner;
3125 const struct consw *defcsw = NULL;
3126 struct con_driver *con_driver = NULL, *con_back = NULL;
3127 int i, retval = -ENODEV;
3128
3129 if (!try_module_get(owner))
3130 return -ENODEV;
3131
3132 console_lock();
3133
3134 /* check if driver is registered and if it is unbindable */
3135 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3136 con_driver = &registered_con_driver[i];
3137
3138 if (con_driver->con == csw &&
3139 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3140 retval = 0;
3141 break;
3142 }
3143 }
3144
3145 if (retval) {
3146 console_unlock();
3147 goto err;
3148 }
3149
3150 retval = -ENODEV;
3151
3152 /* check if backup driver exists */
3153 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3154 con_back = &registered_con_driver[i];
3155
3156 if (con_back->con &&
3157 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3158 defcsw = con_back->con;
3159 retval = 0;
3160 break;
3161 }
3162 }
3163
3164 if (retval) {
3165 console_unlock();
3166 goto err;
3167 }
3168
3169 if (!con_is_bound(csw)) {
3170 console_unlock();
3171 goto err;
3172 }
3173
3174 first = max(first, con_driver->first);
3175 last = min(last, con_driver->last);
3176
3177 for (i = first; i <= last; i++) {
3178 if (con_driver_map[i] == csw) {
3179 module_put(csw->owner);
3180 con_driver_map[i] = NULL;
3181 }
3182 }
3183
3184 if (!con_is_bound(defcsw)) {
3185 const struct consw *defconsw = conswitchp;
3186
3187 defcsw->con_startup();
3188 con_back->flag |= CON_DRIVER_FLAG_INIT;
3189 /*
3190 * vgacon may change the default driver to point
3191 * to dummycon, we restore it here...
3192 */
3193 conswitchp = defconsw;
3194 }
3195
3196 if (!con_is_bound(csw))
3197 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3198
3199 console_unlock();
3200 /* ignore return value, binding should not fail */
3201 bind_con_driver(defcsw, first, last, deflt);
3202 err:
3203 module_put(owner);
3204 return retval;
3205
3206 }
3207 EXPORT_SYMBOL(unbind_con_driver);
3208
3209 static int vt_bind(struct con_driver *con)
3210 {
3211 const struct consw *defcsw = NULL, *csw = NULL;
3212 int i, more = 1, first = -1, last = -1, deflt = 0;
3213
3214 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3215 con_is_graphics(con->con, con->first, con->last))
3216 goto err;
3217
3218 csw = con->con;
3219
3220 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3221 struct con_driver *con = &registered_con_driver[i];
3222
3223 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3224 defcsw = con->con;
3225 break;
3226 }
3227 }
3228
3229 if (!defcsw)
3230 goto err;
3231
3232 while (more) {
3233 more = 0;
3234
3235 for (i = con->first; i <= con->last; i++) {
3236 if (con_driver_map[i] == defcsw) {
3237 if (first == -1)
3238 first = i;
3239 last = i;
3240 more = 1;
3241 } else if (first != -1)
3242 break;
3243 }
3244
3245 if (first == 0 && last == MAX_NR_CONSOLES -1)
3246 deflt = 1;
3247
3248 if (first != -1)
3249 bind_con_driver(csw, first, last, deflt);
3250
3251 first = -1;
3252 last = -1;
3253 deflt = 0;
3254 }
3255
3256 err:
3257 return 0;
3258 }
3259
3260 static int vt_unbind(struct con_driver *con)
3261 {
3262 const struct consw *csw = NULL;
3263 int i, more = 1, first = -1, last = -1, deflt = 0;
3264
3265 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3266 con_is_graphics(con->con, con->first, con->last))
3267 goto err;
3268
3269 csw = con->con;
3270
3271 while (more) {
3272 more = 0;
3273
3274 for (i = con->first; i <= con->last; i++) {
3275 if (con_driver_map[i] == csw) {
3276 if (first == -1)
3277 first = i;
3278 last = i;
3279 more = 1;
3280 } else if (first != -1)
3281 break;
3282 }
3283
3284 if (first == 0 && last == MAX_NR_CONSOLES -1)
3285 deflt = 1;
3286
3287 if (first != -1)
3288 unbind_con_driver(csw, first, last, deflt);
3289
3290 first = -1;
3291 last = -1;
3292 deflt = 0;
3293 }
3294
3295 err:
3296 return 0;
3297 }
3298 #else
3299 static inline int vt_bind(struct con_driver *con)
3300 {
3301 return 0;
3302 }
3303 static inline int vt_unbind(struct con_driver *con)
3304 {
3305 return 0;
3306 }
3307 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3308
3309 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3310 const char *buf, size_t count)
3311 {
3312 struct con_driver *con = dev_get_drvdata(dev);
3313 int bind = simple_strtoul(buf, NULL, 0);
3314
3315 if (bind)
3316 vt_bind(con);
3317 else
3318 vt_unbind(con);
3319
3320 return count;
3321 }
3322
3323 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3324 char *buf)
3325 {
3326 struct con_driver *con = dev_get_drvdata(dev);
3327 int bind = con_is_bound(con->con);
3328
3329 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3330 }
3331
3332 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3333 char *buf)
3334 {
3335 struct con_driver *con = dev_get_drvdata(dev);
3336
3337 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3338 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3339 con->desc);
3340
3341 }
3342
3343 static struct device_attribute device_attrs[] = {
3344 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3345 __ATTR(name, S_IRUGO, show_name, NULL),
3346 };
3347
3348 static int vtconsole_init_device(struct con_driver *con)
3349 {
3350 int i;
3351 int error = 0;
3352
3353 con->flag |= CON_DRIVER_FLAG_ATTR;
3354 dev_set_drvdata(con->dev, con);
3355 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3356 error = device_create_file(con->dev, &device_attrs[i]);
3357 if (error)
3358 break;
3359 }
3360
3361 if (error) {
3362 while (--i >= 0)
3363 device_remove_file(con->dev, &device_attrs[i]);
3364 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3365 }
3366
3367 return error;
3368 }
3369
3370 static void vtconsole_deinit_device(struct con_driver *con)
3371 {
3372 int i;
3373
3374 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3375 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3376 device_remove_file(con->dev, &device_attrs[i]);
3377 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3378 }
3379 }
3380
3381 /**
3382 * con_is_bound - checks if driver is bound to the console
3383 * @csw: console driver
3384 *
3385 * RETURNS: zero if unbound, nonzero if bound
3386 *
3387 * Drivers can call this and if zero, they should release
3388 * all resources allocated on con_startup()
3389 */
3390 int con_is_bound(const struct consw *csw)
3391 {
3392 int i, bound = 0;
3393
3394 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3395 if (con_driver_map[i] == csw) {
3396 bound = 1;
3397 break;
3398 }
3399 }
3400
3401 return bound;
3402 }
3403 EXPORT_SYMBOL(con_is_bound);
3404
3405 /**
3406 * con_debug_enter - prepare the console for the kernel debugger
3407 * @sw: console driver
3408 *
3409 * Called when the console is taken over by the kernel debugger, this
3410 * function needs to save the current console state, then put the console
3411 * into a state suitable for the kernel debugger.
3412 *
3413 * RETURNS:
3414 * Zero on success, nonzero if a failure occurred when trying to prepare
3415 * the console for the debugger.
3416 */
3417 int con_debug_enter(struct vc_data *vc)
3418 {
3419 int ret = 0;
3420
3421 saved_fg_console = fg_console;
3422 saved_last_console = last_console;
3423 saved_want_console = want_console;
3424 saved_vc_mode = vc->vc_mode;
3425 saved_console_blanked = console_blanked;
3426 vc->vc_mode = KD_TEXT;
3427 console_blanked = 0;
3428 if (vc->vc_sw->con_debug_enter)
3429 ret = vc->vc_sw->con_debug_enter(vc);
3430 #ifdef CONFIG_KGDB_KDB
3431 /* Set the initial LINES variable if it is not already set */
3432 if (vc->vc_rows < 999) {
3433 int linecount;
3434 char lns[4];
3435 const char *setargs[3] = {
3436 "set",
3437 "LINES",
3438 lns,
3439 };
3440 if (kdbgetintenv(setargs[0], &linecount)) {
3441 snprintf(lns, 4, "%i", vc->vc_rows);
3442 kdb_set(2, setargs);
3443 }
3444 }
3445 #endif /* CONFIG_KGDB_KDB */
3446 return ret;
3447 }
3448 EXPORT_SYMBOL_GPL(con_debug_enter);
3449
3450 /**
3451 * con_debug_leave - restore console state
3452 * @sw: console driver
3453 *
3454 * Restore the console state to what it was before the kernel debugger
3455 * was invoked.
3456 *
3457 * RETURNS:
3458 * Zero on success, nonzero if a failure occurred when trying to restore
3459 * the console.
3460 */
3461 int con_debug_leave(void)
3462 {
3463 struct vc_data *vc;
3464 int ret = 0;
3465
3466 fg_console = saved_fg_console;
3467 last_console = saved_last_console;
3468 want_console = saved_want_console;
3469 console_blanked = saved_console_blanked;
3470 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3471
3472 vc = vc_cons[fg_console].d;
3473 if (vc->vc_sw->con_debug_leave)
3474 ret = vc->vc_sw->con_debug_leave(vc);
3475 return ret;
3476 }
3477 EXPORT_SYMBOL_GPL(con_debug_leave);
3478
3479 /**
3480 * register_con_driver - register console driver to console layer
3481 * @csw: console driver
3482 * @first: the first console to take over, minimum value is 0
3483 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3484 *
3485 * DESCRIPTION: This function registers a console driver which can later
3486 * bind to a range of consoles specified by @first and @last. It will
3487 * also initialize the console driver by calling con_startup().
3488 */
3489 int register_con_driver(const struct consw *csw, int first, int last)
3490 {
3491 struct module *owner = csw->owner;
3492 struct con_driver *con_driver;
3493 const char *desc;
3494 int i, retval = 0;
3495
3496 if (!try_module_get(owner))
3497 return -ENODEV;
3498
3499 console_lock();
3500
3501 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3502 con_driver = &registered_con_driver[i];
3503
3504 /* already registered */
3505 if (con_driver->con == csw)
3506 retval = -EBUSY;
3507 }
3508
3509 if (retval)
3510 goto err;
3511
3512 desc = csw->con_startup();
3513
3514 if (!desc)
3515 goto err;
3516
3517 retval = -EINVAL;
3518
3519 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3520 con_driver = &registered_con_driver[i];
3521
3522 if (con_driver->con == NULL) {
3523 con_driver->con = csw;
3524 con_driver->desc = desc;
3525 con_driver->node = i;
3526 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3527 CON_DRIVER_FLAG_INIT;
3528 con_driver->first = first;
3529 con_driver->last = last;
3530 retval = 0;
3531 break;
3532 }
3533 }
3534
3535 if (retval)
3536 goto err;
3537
3538 con_driver->dev = device_create(vtconsole_class, NULL,
3539 MKDEV(0, con_driver->node),
3540 NULL, "vtcon%i",
3541 con_driver->node);
3542
3543 if (IS_ERR(con_driver->dev)) {
3544 printk(KERN_WARNING "Unable to create device for %s; "
3545 "errno = %ld\n", con_driver->desc,
3546 PTR_ERR(con_driver->dev));
3547 con_driver->dev = NULL;
3548 } else {
3549 vtconsole_init_device(con_driver);
3550 }
3551
3552 err:
3553 console_unlock();
3554 module_put(owner);
3555 return retval;
3556 }
3557 EXPORT_SYMBOL(register_con_driver);
3558
3559 /**
3560 * unregister_con_driver - unregister console driver from console layer
3561 * @csw: console driver
3562 *
3563 * DESCRIPTION: All drivers that registers to the console layer must
3564 * call this function upon exit, or if the console driver is in a state
3565 * where it won't be able to handle console services, such as the
3566 * framebuffer console without loaded framebuffer drivers.
3567 *
3568 * The driver must unbind first prior to unregistration.
3569 */
3570 int unregister_con_driver(const struct consw *csw)
3571 {
3572 int i, retval = -ENODEV;
3573
3574 console_lock();
3575
3576 /* cannot unregister a bound driver */
3577 if (con_is_bound(csw))
3578 goto err;
3579
3580 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3581 struct con_driver *con_driver = &registered_con_driver[i];
3582
3583 if (con_driver->con == csw &&
3584 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3585 vtconsole_deinit_device(con_driver);
3586 device_destroy(vtconsole_class,
3587 MKDEV(0, con_driver->node));
3588 con_driver->con = NULL;
3589 con_driver->desc = NULL;
3590 con_driver->dev = NULL;
3591 con_driver->node = 0;
3592 con_driver->flag = 0;
3593 con_driver->first = 0;
3594 con_driver->last = 0;
3595 retval = 0;
3596 break;
3597 }
3598 }
3599 err:
3600 console_unlock();
3601 return retval;
3602 }
3603 EXPORT_SYMBOL(unregister_con_driver);
3604
3605 /*
3606 * If we support more console drivers, this function is used
3607 * when a driver wants to take over some existing consoles
3608 * and become default driver for newly opened ones.
3609 *
3610 * take_over_console is basically a register followed by unbind
3611 */
3612 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3613 {
3614 int err;
3615
3616 err = register_con_driver(csw, first, last);
3617 /* if we get an busy error we still want to bind the console driver
3618 * and return success, as we may have unbound the console driver
3619  * but not unregistered it.
3620 */
3621 if (err == -EBUSY)
3622 err = 0;
3623 if (!err)
3624 bind_con_driver(csw, first, last, deflt);
3625
3626 return err;
3627 }
3628
3629 /*
3630 * give_up_console is a wrapper to unregister_con_driver. It will only
3631 * work if driver is fully unbound.
3632 */
3633 void give_up_console(const struct consw *csw)
3634 {
3635 unregister_con_driver(csw);
3636 }
3637
3638 static int __init vtconsole_class_init(void)
3639 {
3640 int i;
3641
3642 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3643 if (IS_ERR(vtconsole_class)) {
3644 printk(KERN_WARNING "Unable to create vt console class; "
3645 "errno = %ld\n", PTR_ERR(vtconsole_class));
3646 vtconsole_class = NULL;
3647 }
3648
3649 /* Add system drivers to sysfs */
3650 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3651 struct con_driver *con = &registered_con_driver[i];
3652
3653 if (con->con && !con->dev) {
3654 con->dev = device_create(vtconsole_class, NULL,
3655 MKDEV(0, con->node),
3656 NULL, "vtcon%i",
3657 con->node);
3658
3659 if (IS_ERR(con->dev)) {
3660 printk(KERN_WARNING "Unable to create "
3661 "device for %s; errno = %ld\n",
3662 con->desc, PTR_ERR(con->dev));
3663 con->dev = NULL;
3664 } else {
3665 vtconsole_init_device(con);
3666 }
3667 }
3668 }
3669
3670 return 0;
3671 }
3672 postcore_initcall(vtconsole_class_init);
3673
3674 #endif
3675
3676 /*
3677 * Screen blanking
3678 */
3679
3680 static int set_vesa_blanking(char __user *p)
3681 {
3682 unsigned int mode;
3683
3684 if (get_user(mode, p + 1))
3685 return -EFAULT;
3686
3687 vesa_blank_mode = (mode < 4) ? mode : 0;
3688 return 0;
3689 }
3690
3691 void do_blank_screen(int entering_gfx)
3692 {
3693 struct vc_data *vc = vc_cons[fg_console].d;
3694 int i;
3695
3696 WARN_CONSOLE_UNLOCKED();
3697
3698 if (console_blanked) {
3699 if (blank_state == blank_vesa_wait) {
3700 blank_state = blank_off;
3701 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3702 }
3703 return;
3704 }
3705
3706 /* entering graphics mode? */
3707 if (entering_gfx) {
3708 hide_cursor(vc);
3709 save_screen(vc);
3710 vc->vc_sw->con_blank(vc, -1, 1);
3711 console_blanked = fg_console + 1;
3712 blank_state = blank_off;
3713 set_origin(vc);
3714 return;
3715 }
3716
3717 if (blank_state != blank_normal_wait)
3718 return;
3719 blank_state = blank_off;
3720
3721 /* don't blank graphics */
3722 if (vc->vc_mode != KD_TEXT) {
3723 console_blanked = fg_console + 1;
3724 return;
3725 }
3726
3727 hide_cursor(vc);
3728 del_timer_sync(&console_timer);
3729 blank_timer_expired = 0;
3730
3731 save_screen(vc);
3732 /* In case we need to reset origin, blanking hook returns 1 */
3733 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3734 console_blanked = fg_console + 1;
3735 if (i)
3736 set_origin(vc);
3737
3738 if (console_blank_hook && console_blank_hook(1))
3739 return;
3740
3741 if (vesa_off_interval && vesa_blank_mode) {
3742 blank_state = blank_vesa_wait;
3743 mod_timer(&console_timer, jiffies + vesa_off_interval);
3744 }
3745 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3746 }
3747 EXPORT_SYMBOL(do_blank_screen);
3748
3749 /*
3750 * Called by timer as well as from vt_console_driver
3751 */
3752 void do_unblank_screen(int leaving_gfx)
3753 {
3754 struct vc_data *vc;
3755
3756 /* This should now always be called from a "sane" (read: can schedule)
3757 * context for the sake of the low level drivers, except in the special
3758 * case of oops_in_progress
3759 */
3760 if (!oops_in_progress)
3761 might_sleep();
3762
3763 WARN_CONSOLE_UNLOCKED();
3764
3765 ignore_poke = 0;
3766 if (!console_blanked)
3767 return;
3768 if (!vc_cons_allocated(fg_console)) {
3769 /* impossible */
3770 pr_warning("unblank_screen: tty %d not allocated ??\n",
3771 fg_console+1);
3772 return;
3773 }
3774 vc = vc_cons[fg_console].d;
3775 /* Try to unblank in oops case too */
3776 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3777 return; /* but leave console_blanked != 0 */
3778
3779 if (blankinterval) {
3780 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3781 blank_state = blank_normal_wait;
3782 }
3783
3784 console_blanked = 0;
3785 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3786 /* Low-level driver cannot restore -> do it ourselves */
3787 update_screen(vc);
3788 if (console_blank_hook)
3789 console_blank_hook(0);
3790 set_palette(vc);
3791 set_cursor(vc);
3792 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3793 }
3794 EXPORT_SYMBOL(do_unblank_screen);
3795
3796 /*
3797 * This is called by the outside world to cause a forced unblank, mostly for
3798 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3799 * call it with 1 as an argument and so force a mode restore... that may kill
3800 * X or at least garbage the screen but would also make the Oops visible...
3801 */
3802 void unblank_screen(void)
3803 {
3804 do_unblank_screen(0);
3805 }
3806
3807 /*
3808 * We defer the timer blanking to work queue so it can take the console mutex
3809 * (console operations can still happen at irq time, but only from printk which
3810 * has the console mutex. Not perfect yet, but better than no locking
3811 */
3812 static void blank_screen_t(unsigned long dummy)
3813 {
3814 if (unlikely(!keventd_up())) {
3815 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3816 return;
3817 }
3818 blank_timer_expired = 1;
3819 schedule_work(&console_work);
3820 }
3821
3822 void poke_blanked_console(void)
3823 {
3824 WARN_CONSOLE_UNLOCKED();
3825
3826 /* Add this so we quickly catch whoever might call us in a non
3827 * safe context. Nowadays, unblank_screen() isn't to be called in
3828 * atomic contexts and is allowed to schedule (with the special case
3829 * of oops_in_progress, but that isn't of any concern for this
3830 * function. --BenH.
3831 */
3832 might_sleep();
3833
3834 /* This isn't perfectly race free, but a race here would be mostly harmless,
3835 * at worse, we'll do a spurrious blank and it's unlikely
3836 */
3837 del_timer(&console_timer);
3838 blank_timer_expired = 0;
3839
3840 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3841 return;
3842 if (console_blanked)
3843 unblank_screen();
3844 else if (blankinterval) {
3845 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3846 blank_state = blank_normal_wait;
3847 }
3848 }
3849
3850 /*
3851 * Palettes
3852 */
3853
3854 static void set_palette(struct vc_data *vc)
3855 {
3856 WARN_CONSOLE_UNLOCKED();
3857
3858 if (vc->vc_mode != KD_GRAPHICS)
3859 vc->vc_sw->con_set_palette(vc, color_table);
3860 }
3861
3862 /*
3863 * Load palette into the DAC registers. arg points to a colour
3864 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3865 */
3866
3867 int con_set_cmap(unsigned char __user *arg)
3868 {
3869 int i, j, k;
3870 unsigned char colormap[3*16];
3871
3872 if (copy_from_user(colormap, arg, sizeof(colormap)))
3873 return -EFAULT;
3874
3875 console_lock();
3876 for (i = k = 0; i < 16; i++) {
3877 default_red[i] = colormap[k++];
3878 default_grn[i] = colormap[k++];
3879 default_blu[i] = colormap[k++];
3880 }
3881 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3882 if (!vc_cons_allocated(i))
3883 continue;
3884 for (j = k = 0; j < 16; j++) {
3885 vc_cons[i].d->vc_palette[k++] = default_red[j];
3886 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3887 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3888 }
3889 set_palette(vc_cons[i].d);
3890 }
3891 console_unlock();
3892
3893 return 0;
3894 }
3895
3896 int con_get_cmap(unsigned char __user *arg)
3897 {
3898 int i, k;
3899 unsigned char colormap[3*16];
3900
3901 console_lock();
3902 for (i = k = 0; i < 16; i++) {
3903 colormap[k++] = default_red[i];
3904 colormap[k++] = default_grn[i];
3905 colormap[k++] = default_blu[i];
3906 }
3907 console_unlock();
3908
3909 if (copy_to_user(arg, colormap, sizeof(colormap)))
3910 return -EFAULT;
3911
3912 return 0;
3913 }
3914
3915 void reset_palette(struct vc_data *vc)
3916 {
3917 int j, k;
3918 for (j=k=0; j<16; j++) {
3919 vc->vc_palette[k++] = default_red[j];
3920 vc->vc_palette[k++] = default_grn[j];
3921 vc->vc_palette[k++] = default_blu[j];
3922 }
3923 set_palette(vc);
3924 }
3925
3926 /*
3927 * Font switching
3928 *
3929 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3930 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3931 * depending on width) reserved for each character which is kinda wasty, but
3932 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3933 * is up to the actual low-level console-driver convert data into its favorite
3934 * format (maybe we should add a `fontoffset' field to the `display'
3935 * structure so we won't have to convert the fontdata all the time.
3936 * /Jes
3937 */
3938
3939 #define max_font_size 65536
3940
3941 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3942 {
3943 struct console_font font;
3944 int rc = -EINVAL;
3945 int c;
3946
3947 if (op->data) {
3948 font.data = kmalloc(max_font_size, GFP_KERNEL);
3949 if (!font.data)
3950 return -ENOMEM;
3951 } else
3952 font.data = NULL;
3953
3954 console_lock();
3955 if (vc->vc_mode != KD_TEXT)
3956 rc = -EINVAL;
3957 else if (vc->vc_sw->con_font_get)
3958 rc = vc->vc_sw->con_font_get(vc, &font);
3959 else
3960 rc = -ENOSYS;
3961 console_unlock();
3962
3963 if (rc)
3964 goto out;
3965
3966 c = (font.width+7)/8 * 32 * font.charcount;
3967
3968 if (op->data && font.charcount > op->charcount)
3969 rc = -ENOSPC;
3970 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3971 if (font.width > op->width || font.height > op->height)
3972 rc = -ENOSPC;
3973 } else {
3974 if (font.width != 8)
3975 rc = -EIO;
3976 else if ((op->height && font.height > op->height) ||
3977 font.height > 32)
3978 rc = -ENOSPC;
3979 }
3980 if (rc)
3981 goto out;
3982
3983 op->height = font.height;
3984 op->width = font.width;
3985 op->charcount = font.charcount;
3986
3987 if (op->data && copy_to_user(op->data, font.data, c))
3988 rc = -EFAULT;
3989
3990 out:
3991 kfree(font.data);
3992 return rc;
3993 }
3994
3995 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3996 {
3997 struct console_font font;
3998 int rc = -EINVAL;
3999 int size;
4000
4001 if (vc->vc_mode != KD_TEXT)
4002 return -EINVAL;
4003 if (!op->data)
4004 return -EINVAL;
4005 if (op->charcount > 512)
4006 return -EINVAL;
4007 if (!op->height) { /* Need to guess font height [compat] */
4008 int h, i;
4009 u8 __user *charmap = op->data;
4010 u8 tmp;
4011
4012 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4013 so that we can get rid of this soon */
4014 if (!(op->flags & KD_FONT_FLAG_OLD))
4015 return -EINVAL;
4016 for (h = 32; h > 0; h--)
4017 for (i = 0; i < op->charcount; i++) {
4018 if (get_user(tmp, &charmap[32*i+h-1]))
4019 return -EFAULT;
4020 if (tmp)
4021 goto nonzero;
4022 }
4023 return -EINVAL;
4024 nonzero:
4025 op->height = h;
4026 }
4027 if (op->width <= 0 || op->width > 32 || op->height > 32)
4028 return -EINVAL;
4029 size = (op->width+7)/8 * 32 * op->charcount;
4030 if (size > max_font_size)
4031 return -ENOSPC;
4032 font.charcount = op->charcount;
4033 font.height = op->height;
4034 font.width = op->width;
4035 font.data = memdup_user(op->data, size);
4036 if (IS_ERR(font.data))
4037 return PTR_ERR(font.data);
4038 console_lock();
4039 if (vc->vc_mode != KD_TEXT)
4040 rc = -EINVAL;
4041 else if (vc->vc_sw->con_font_set)
4042 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4043 else
4044 rc = -ENOSYS;
4045 console_unlock();
4046 kfree(font.data);
4047 return rc;
4048 }
4049
4050 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4051 {
4052 struct console_font font = {.width = op->width, .height = op->height};
4053 char name[MAX_FONT_NAME];
4054 char *s = name;
4055 int rc;
4056
4057
4058 if (!op->data)
4059 s = NULL;
4060 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4061 return -EFAULT;
4062 else
4063 name[MAX_FONT_NAME - 1] = 0;
4064
4065 console_lock();
4066 if (vc->vc_mode != KD_TEXT) {
4067 console_unlock();
4068 return -EINVAL;
4069 }
4070 if (vc->vc_sw->con_font_default)
4071 rc = vc->vc_sw->con_font_default(vc, &font, s);
4072 else
4073 rc = -ENOSYS;
4074 console_unlock();
4075 if (!rc) {
4076 op->width = font.width;
4077 op->height = font.height;
4078 }
4079 return rc;
4080 }
4081
4082 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4083 {
4084 int con = op->height;
4085 int rc;
4086
4087
4088 console_lock();
4089 if (vc->vc_mode != KD_TEXT)
4090 rc = -EINVAL;
4091 else if (!vc->vc_sw->con_font_copy)
4092 rc = -ENOSYS;
4093 else if (con < 0 || !vc_cons_allocated(con))
4094 rc = -ENOTTY;
4095 else if (con == vc->vc_num) /* nothing to do */
4096 rc = 0;
4097 else
4098 rc = vc->vc_sw->con_font_copy(vc, con);
4099 console_unlock();
4100 return rc;
4101 }
4102
4103 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4104 {
4105 switch (op->op) {
4106 case KD_FONT_OP_SET:
4107 return con_font_set(vc, op);
4108 case KD_FONT_OP_GET:
4109 return con_font_get(vc, op);
4110 case KD_FONT_OP_SET_DEFAULT:
4111 return con_font_default(vc, op);
4112 case KD_FONT_OP_COPY:
4113 return con_font_copy(vc, op);
4114 }
4115 return -ENOSYS;
4116 }
4117
4118 /*
4119 * Interface exported to selection and vcs.
4120 */
4121
4122 /* used by selection */
4123 u16 screen_glyph(struct vc_data *vc, int offset)
4124 {
4125 u16 w = scr_readw(screenpos(vc, offset, 1));
4126 u16 c = w & 0xff;
4127
4128 if (w & vc->vc_hi_font_mask)
4129 c |= 0x100;
4130 return c;
4131 }
4132 EXPORT_SYMBOL_GPL(screen_glyph);
4133
4134 /* used by vcs - note the word offset */
4135 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4136 {
4137 return screenpos(vc, 2 * w_offset, viewed);
4138 }
4139
4140 void getconsxy(struct vc_data *vc, unsigned char *p)
4141 {
4142 p[0] = vc->vc_x;
4143 p[1] = vc->vc_y;
4144 }
4145
4146 void putconsxy(struct vc_data *vc, unsigned char *p)
4147 {
4148 hide_cursor(vc);
4149 gotoxy(vc, p[0], p[1]);
4150 set_cursor(vc);
4151 }
4152
4153 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4154 {
4155 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4156 return softcursor_original;
4157 return scr_readw(org);
4158 }
4159
4160 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4161 {
4162 scr_writew(val, org);
4163 if ((unsigned long)org == vc->vc_pos) {
4164 softcursor_original = -1;
4165 add_softcursor(vc);
4166 }
4167 }
4168
4169 void vcs_scr_updated(struct vc_data *vc)
4170 {
4171 notify_update(vc);
4172 }
4173
4174 /*
4175 * Visible symbols for modules
4176 */
4177
4178 EXPORT_SYMBOL(color_table);
4179 EXPORT_SYMBOL(default_red);
4180 EXPORT_SYMBOL(default_grn);
4181 EXPORT_SYMBOL(default_blu);
4182 EXPORT_SYMBOL(update_region);
4183 EXPORT_SYMBOL(redraw_screen);
4184 EXPORT_SYMBOL(vc_resize);
4185 EXPORT_SYMBOL(fg_console);
4186 EXPORT_SYMBOL(console_blank_hook);
4187 EXPORT_SYMBOL(console_blanked);
4188 EXPORT_SYMBOL(vc_cons);
4189 EXPORT_SYMBOL(global_cursor_default);
4190 #ifndef VT_SINGLE_DRIVER
4191 EXPORT_SYMBOL(take_over_console);
4192 EXPORT_SYMBOL(give_up_console);
4193 #endif
Linux kernel - Deliverables
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