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[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 - nr) * 2);
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);
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) * 2);
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);
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 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 tty_port_destroy(&vc->port);
783 kfree(vc);
784 vc_cons[currcons].d = NULL;
785 return -ENOMEM;
786 }
787
788 /* If no drivers have overridden us and the user didn't pass a
789 boot option, default to displaying the cursor */
790 if (global_cursor_default == -1)
791 global_cursor_default = 1;
792
793 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
794 vcs_make_sysfs(currcons);
795 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
796 }
797 return 0;
798 }
799
800 static inline int resize_screen(struct vc_data *vc, int width, int height,
801 int user)
802 {
803 /* Resizes the resolution of the display adapater */
804 int err = 0;
805
806 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
807 err = vc->vc_sw->con_resize(vc, width, height, user);
808
809 return err;
810 }
811
812 /*
813 * Change # of rows and columns (0 means unchanged/the size of fg_console)
814 * [this is to be used together with some user program
815 * like resize that changes the hardware videomode]
816 */
817 #define VC_RESIZE_MAXCOL (32767)
818 #define VC_RESIZE_MAXROW (32767)
819
820 /**
821 * vc_do_resize - resizing method for the tty
822 * @tty: tty being resized
823 * @real_tty: real tty (different to tty if a pty/tty pair)
824 * @vc: virtual console private data
825 * @cols: columns
826 * @lines: lines
827 *
828 * Resize a virtual console, clipping according to the actual constraints.
829 * If the caller passes a tty structure then update the termios winsize
830 * information and perform any necessary signal handling.
831 *
832 * Caller must hold the console semaphore. Takes the termios mutex and
833 * ctrl_lock of the tty IFF a tty is passed.
834 */
835
836 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
837 unsigned int cols, unsigned int lines)
838 {
839 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
840 unsigned long end;
841 unsigned int old_rows, old_row_size;
842 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
843 unsigned int user;
844 unsigned short *newscreen;
845
846 WARN_CONSOLE_UNLOCKED();
847
848 if (!vc)
849 return -ENXIO;
850
851 user = vc->vc_resize_user;
852 vc->vc_resize_user = 0;
853
854 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
855 return -EINVAL;
856
857 new_cols = (cols ? cols : vc->vc_cols);
858 new_rows = (lines ? lines : vc->vc_rows);
859 new_row_size = new_cols << 1;
860 new_screen_size = new_row_size * new_rows;
861
862 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
863 return 0;
864
865 newscreen = kmalloc(new_screen_size, GFP_USER);
866 if (!newscreen)
867 return -ENOMEM;
868
869 old_rows = vc->vc_rows;
870 old_row_size = vc->vc_size_row;
871
872 err = resize_screen(vc, new_cols, new_rows, user);
873 if (err) {
874 kfree(newscreen);
875 return err;
876 }
877
878 vc->vc_rows = new_rows;
879 vc->vc_cols = new_cols;
880 vc->vc_size_row = new_row_size;
881 vc->vc_screenbuf_size = new_screen_size;
882
883 rlth = min(old_row_size, new_row_size);
884 rrem = new_row_size - rlth;
885 old_origin = vc->vc_origin;
886 new_origin = (long) newscreen;
887 new_scr_end = new_origin + new_screen_size;
888
889 if (vc->vc_y > new_rows) {
890 if (old_rows - vc->vc_y < new_rows) {
891 /*
892 * Cursor near the bottom, copy contents from the
893 * bottom of buffer
894 */
895 old_origin += (old_rows - new_rows) * old_row_size;
896 } else {
897 /*
898 * Cursor is in no man's land, copy 1/2 screenful
899 * from the top and bottom of cursor position
900 */
901 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
902 }
903 }
904
905 end = old_origin + old_row_size * min(old_rows, new_rows);
906
907 update_attr(vc);
908
909 while (old_origin < end) {
910 scr_memcpyw((unsigned short *) new_origin,
911 (unsigned short *) old_origin, rlth);
912 if (rrem)
913 scr_memsetw((void *)(new_origin + rlth),
914 vc->vc_video_erase_char, rrem);
915 old_origin += old_row_size;
916 new_origin += new_row_size;
917 }
918 if (new_scr_end > new_origin)
919 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
920 new_scr_end - new_origin);
921 kfree(vc->vc_screenbuf);
922 vc->vc_screenbuf = newscreen;
923 vc->vc_screenbuf_size = new_screen_size;
924 set_origin(vc);
925
926 /* do part of a reset_terminal() */
927 vc->vc_top = 0;
928 vc->vc_bottom = vc->vc_rows;
929 gotoxy(vc, vc->vc_x, vc->vc_y);
930 save_cur(vc);
931
932 if (tty) {
933 /* Rewrite the requested winsize data with the actual
934 resulting sizes */
935 struct winsize ws;
936 memset(&ws, 0, sizeof(ws));
937 ws.ws_row = vc->vc_rows;
938 ws.ws_col = vc->vc_cols;
939 ws.ws_ypixel = vc->vc_scan_lines;
940 tty_do_resize(tty, &ws);
941 }
942
943 if (CON_IS_VISIBLE(vc))
944 update_screen(vc);
945 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
946 return err;
947 }
948
949 /**
950 * vc_resize - resize a VT
951 * @vc: virtual console
952 * @cols: columns
953 * @rows: rows
954 *
955 * Resize a virtual console as seen from the console end of things. We
956 * use the common vc_do_resize methods to update the structures. The
957 * caller must hold the console sem to protect console internals and
958 * vc->port.tty
959 */
960
961 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
962 {
963 return vc_do_resize(vc->port.tty, vc, cols, rows);
964 }
965
966 /**
967 * vt_resize - resize a VT
968 * @tty: tty to resize
969 * @ws: winsize attributes
970 *
971 * Resize a virtual terminal. This is called by the tty layer as we
972 * register our own handler for resizing. The mutual helper does all
973 * the actual work.
974 *
975 * Takes the console sem and the called methods then take the tty
976 * termios_mutex and the tty ctrl_lock in that order.
977 */
978 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
979 {
980 struct vc_data *vc = tty->driver_data;
981 int ret;
982
983 console_lock();
984 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
985 console_unlock();
986 return ret;
987 }
988
989 void vc_deallocate(unsigned int currcons)
990 {
991 WARN_CONSOLE_UNLOCKED();
992
993 if (vc_cons_allocated(currcons)) {
994 struct vc_data *vc = vc_cons[currcons].d;
995 struct vt_notifier_param param = { .vc = vc };
996
997 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
998 vcs_remove_sysfs(currcons);
999 vc->vc_sw->con_deinit(vc);
1000 put_pid(vc->vt_pid);
1001 module_put(vc->vc_sw->owner);
1002 kfree(vc->vc_screenbuf);
1003 if (currcons >= MIN_NR_CONSOLES) {
1004 tty_port_destroy(&vc->port);
1005 kfree(vc);
1006 }
1007 vc_cons[currcons].d = NULL;
1008 }
1009 }
1010
1011 /*
1012 * VT102 emulator
1013 */
1014
1015 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1016 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1017 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1018
1019 #define decarm VC_REPEAT
1020 #define decckm VC_CKMODE
1021 #define kbdapplic VC_APPLIC
1022 #define lnm VC_CRLF
1023
1024 /*
1025 * this is what the terminal answers to a ESC-Z or csi0c query.
1026 */
1027 #define VT100ID "\033[?1;2c"
1028 #define VT102ID "\033[?6c"
1029
1030 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1031 8,12,10,14, 9,13,11,15 };
1032
1033 /* the default colour table, for VGA+ colour systems */
1034 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1035 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1036 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1037 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1038 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1039 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1040
1041 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1042 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1043 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1044
1045 /*
1046 * gotoxy() must verify all boundaries, because the arguments
1047 * might also be negative. If the given position is out of
1048 * bounds, the cursor is placed at the nearest margin.
1049 */
1050 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1051 {
1052 int min_y, max_y;
1053
1054 if (new_x < 0)
1055 vc->vc_x = 0;
1056 else {
1057 if (new_x >= vc->vc_cols)
1058 vc->vc_x = vc->vc_cols - 1;
1059 else
1060 vc->vc_x = new_x;
1061 }
1062
1063 if (vc->vc_decom) {
1064 min_y = vc->vc_top;
1065 max_y = vc->vc_bottom;
1066 } else {
1067 min_y = 0;
1068 max_y = vc->vc_rows;
1069 }
1070 if (new_y < min_y)
1071 vc->vc_y = min_y;
1072 else if (new_y >= max_y)
1073 vc->vc_y = max_y - 1;
1074 else
1075 vc->vc_y = new_y;
1076 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1077 vc->vc_need_wrap = 0;
1078 }
1079
1080 /* for absolute user moves, when decom is set */
1081 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1082 {
1083 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1084 }
1085
1086 void scrollback(struct vc_data *vc, int lines)
1087 {
1088 if (!lines)
1089 lines = vc->vc_rows / 2;
1090 scrolldelta(-lines);
1091 }
1092
1093 void scrollfront(struct vc_data *vc, int lines)
1094 {
1095 if (!lines)
1096 lines = vc->vc_rows / 2;
1097 scrolldelta(lines);
1098 }
1099
1100 static void lf(struct vc_data *vc)
1101 {
1102 /* don't scroll if above bottom of scrolling region, or
1103 * if below scrolling region
1104 */
1105 if (vc->vc_y + 1 == vc->vc_bottom)
1106 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1107 else if (vc->vc_y < vc->vc_rows - 1) {
1108 vc->vc_y++;
1109 vc->vc_pos += vc->vc_size_row;
1110 }
1111 vc->vc_need_wrap = 0;
1112 notify_write(vc, '\n');
1113 }
1114
1115 static void ri(struct vc_data *vc)
1116 {
1117 /* don't scroll if below top of scrolling region, or
1118 * if above scrolling region
1119 */
1120 if (vc->vc_y == vc->vc_top)
1121 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1122 else if (vc->vc_y > 0) {
1123 vc->vc_y--;
1124 vc->vc_pos -= vc->vc_size_row;
1125 }
1126 vc->vc_need_wrap = 0;
1127 }
1128
1129 static inline void cr(struct vc_data *vc)
1130 {
1131 vc->vc_pos -= vc->vc_x << 1;
1132 vc->vc_need_wrap = vc->vc_x = 0;
1133 notify_write(vc, '\r');
1134 }
1135
1136 static inline void bs(struct vc_data *vc)
1137 {
1138 if (vc->vc_x) {
1139 vc->vc_pos -= 2;
1140 vc->vc_x--;
1141 vc->vc_need_wrap = 0;
1142 notify_write(vc, '\b');
1143 }
1144 }
1145
1146 static inline void del(struct vc_data *vc)
1147 {
1148 /* ignored */
1149 }
1150
1151 static void csi_J(struct vc_data *vc, int vpar)
1152 {
1153 unsigned int count;
1154 unsigned short * start;
1155
1156 switch (vpar) {
1157 case 0: /* erase from cursor to end of display */
1158 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1159 start = (unsigned short *)vc->vc_pos;
1160 break;
1161 case 1: /* erase from start to cursor */
1162 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1163 start = (unsigned short *)vc->vc_origin;
1164 break;
1165 case 3: /* erase scroll-back buffer (and whole display) */
1166 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1167 vc->vc_screenbuf_size >> 1);
1168 set_origin(vc);
1169 /* fall through */
1170 case 2: /* erase whole display */
1171 count = vc->vc_cols * vc->vc_rows;
1172 start = (unsigned short *)vc->vc_origin;
1173 break;
1174 default:
1175 return;
1176 }
1177 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1178 if (DO_UPDATE(vc))
1179 do_update_region(vc, (unsigned long) start, count);
1180 vc->vc_need_wrap = 0;
1181 }
1182
1183 static void csi_K(struct vc_data *vc, int vpar)
1184 {
1185 unsigned int count;
1186 unsigned short * start;
1187
1188 switch (vpar) {
1189 case 0: /* erase from cursor to end of line */
1190 count = vc->vc_cols - vc->vc_x;
1191 start = (unsigned short *)vc->vc_pos;
1192 break;
1193 case 1: /* erase from start of line to cursor */
1194 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1195 count = vc->vc_x + 1;
1196 break;
1197 case 2: /* erase whole line */
1198 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1199 count = vc->vc_cols;
1200 break;
1201 default:
1202 return;
1203 }
1204 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1205 vc->vc_need_wrap = 0;
1206 if (DO_UPDATE(vc))
1207 do_update_region(vc, (unsigned long) start, count);
1208 }
1209
1210 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1211 { /* not vt100? */
1212 int count;
1213
1214 if (!vpar)
1215 vpar++;
1216 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1217
1218 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1219 if (DO_UPDATE(vc))
1220 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1221 vc->vc_need_wrap = 0;
1222 }
1223
1224 static void default_attr(struct vc_data *vc)
1225 {
1226 vc->vc_intensity = 1;
1227 vc->vc_italic = 0;
1228 vc->vc_underline = 0;
1229 vc->vc_reverse = 0;
1230 vc->vc_blink = 0;
1231 vc->vc_color = vc->vc_def_color;
1232 }
1233
1234 /* console_lock is held */
1235 static void csi_m(struct vc_data *vc)
1236 {
1237 int i;
1238
1239 for (i = 0; i <= vc->vc_npar; i++)
1240 switch (vc->vc_par[i]) {
1241 case 0: /* all attributes off */
1242 default_attr(vc);
1243 break;
1244 case 1:
1245 vc->vc_intensity = 2;
1246 break;
1247 case 2:
1248 vc->vc_intensity = 0;
1249 break;
1250 case 3:
1251 vc->vc_italic = 1;
1252 break;
1253 case 4:
1254 vc->vc_underline = 1;
1255 break;
1256 case 5:
1257 vc->vc_blink = 1;
1258 break;
1259 case 7:
1260 vc->vc_reverse = 1;
1261 break;
1262 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1263 * Select primary font, don't display
1264 * control chars if defined, don't set
1265 * bit 8 on output.
1266 */
1267 vc->vc_translate = set_translate(vc->vc_charset == 0
1268 ? vc->vc_G0_charset
1269 : vc->vc_G1_charset, vc);
1270 vc->vc_disp_ctrl = 0;
1271 vc->vc_toggle_meta = 0;
1272 break;
1273 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1274 * Select first alternate font, lets
1275 * chars < 32 be displayed as ROM chars.
1276 */
1277 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1278 vc->vc_disp_ctrl = 1;
1279 vc->vc_toggle_meta = 0;
1280 break;
1281 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1282 * Select second alternate font, toggle
1283 * high bit before displaying as ROM char.
1284 */
1285 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1286 vc->vc_disp_ctrl = 1;
1287 vc->vc_toggle_meta = 1;
1288 break;
1289 case 21:
1290 case 22:
1291 vc->vc_intensity = 1;
1292 break;
1293 case 23:
1294 vc->vc_italic = 0;
1295 break;
1296 case 24:
1297 vc->vc_underline = 0;
1298 break;
1299 case 25:
1300 vc->vc_blink = 0;
1301 break;
1302 case 27:
1303 vc->vc_reverse = 0;
1304 break;
1305 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1306 * Enables underscore, white foreground
1307 * with white underscore (Linux - use
1308 * default foreground).
1309 */
1310 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1311 vc->vc_underline = 1;
1312 break;
1313 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1314 * Disable underline option.
1315 * Reset colour to default? It did this
1316 * before...
1317 */
1318 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1319 vc->vc_underline = 0;
1320 break;
1321 case 49:
1322 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1323 break;
1324 default:
1325 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1326 vc->vc_color = color_table[vc->vc_par[i] - 30]
1327 | (vc->vc_color & 0xf0);
1328 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1329 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1330 | (vc->vc_color & 0x0f);
1331 break;
1332 }
1333 update_attr(vc);
1334 }
1335
1336 static void respond_string(const char *p, struct tty_port *port)
1337 {
1338 while (*p) {
1339 tty_insert_flip_char(port, *p, 0);
1340 p++;
1341 }
1342 tty_schedule_flip(port);
1343 }
1344
1345 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1346 {
1347 char buf[40];
1348
1349 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1350 respond_string(buf, tty->port);
1351 }
1352
1353 static inline void status_report(struct tty_struct *tty)
1354 {
1355 respond_string("\033[0n", tty->port); /* Terminal ok */
1356 }
1357
1358 static inline void respond_ID(struct tty_struct *tty)
1359 {
1360 respond_string(VT102ID, tty->port);
1361 }
1362
1363 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1364 {
1365 char buf[8];
1366
1367 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1368 (char)('!' + mry));
1369 respond_string(buf, tty->port);
1370 }
1371
1372 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1373 int mouse_reporting(void)
1374 {
1375 return vc_cons[fg_console].d->vc_report_mouse;
1376 }
1377
1378 /* console_lock is held */
1379 static void set_mode(struct vc_data *vc, int on_off)
1380 {
1381 int i;
1382
1383 for (i = 0; i <= vc->vc_npar; i++)
1384 if (vc->vc_ques) {
1385 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1386 case 1: /* Cursor keys send ^[Ox/^[[x */
1387 if (on_off)
1388 set_kbd(vc, decckm);
1389 else
1390 clr_kbd(vc, decckm);
1391 break;
1392 case 3: /* 80/132 mode switch unimplemented */
1393 vc->vc_deccolm = on_off;
1394 #if 0
1395 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1396 /* this alone does not suffice; some user mode
1397 utility has to change the hardware regs */
1398 #endif
1399 break;
1400 case 5: /* Inverted screen on/off */
1401 if (vc->vc_decscnm != on_off) {
1402 vc->vc_decscnm = on_off;
1403 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1404 update_attr(vc);
1405 }
1406 break;
1407 case 6: /* Origin relative/absolute */
1408 vc->vc_decom = on_off;
1409 gotoxay(vc, 0, 0);
1410 break;
1411 case 7: /* Autowrap on/off */
1412 vc->vc_decawm = on_off;
1413 break;
1414 case 8: /* Autorepeat on/off */
1415 if (on_off)
1416 set_kbd(vc, decarm);
1417 else
1418 clr_kbd(vc, decarm);
1419 break;
1420 case 9:
1421 vc->vc_report_mouse = on_off ? 1 : 0;
1422 break;
1423 case 25: /* Cursor on/off */
1424 vc->vc_deccm = on_off;
1425 break;
1426 case 1000:
1427 vc->vc_report_mouse = on_off ? 2 : 0;
1428 break;
1429 }
1430 } else {
1431 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1432 case 3: /* Monitor (display ctrls) */
1433 vc->vc_disp_ctrl = on_off;
1434 break;
1435 case 4: /* Insert Mode on/off */
1436 vc->vc_decim = on_off;
1437 break;
1438 case 20: /* Lf, Enter == CrLf/Lf */
1439 if (on_off)
1440 set_kbd(vc, lnm);
1441 else
1442 clr_kbd(vc, lnm);
1443 break;
1444 }
1445 }
1446 }
1447
1448 /* console_lock is held */
1449 static void setterm_command(struct vc_data *vc)
1450 {
1451 switch(vc->vc_par[0]) {
1452 case 1: /* set color for underline mode */
1453 if (vc->vc_can_do_color &&
1454 vc->vc_par[1] < 16) {
1455 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1456 if (vc->vc_underline)
1457 update_attr(vc);
1458 }
1459 break;
1460 case 2: /* set color for half intensity mode */
1461 if (vc->vc_can_do_color &&
1462 vc->vc_par[1] < 16) {
1463 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1464 if (vc->vc_intensity == 0)
1465 update_attr(vc);
1466 }
1467 break;
1468 case 8: /* store colors as defaults */
1469 vc->vc_def_color = vc->vc_attr;
1470 if (vc->vc_hi_font_mask == 0x100)
1471 vc->vc_def_color >>= 1;
1472 default_attr(vc);
1473 update_attr(vc);
1474 break;
1475 case 9: /* set blanking interval */
1476 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1477 poke_blanked_console();
1478 break;
1479 case 10: /* set bell frequency in Hz */
1480 if (vc->vc_npar >= 1)
1481 vc->vc_bell_pitch = vc->vc_par[1];
1482 else
1483 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1484 break;
1485 case 11: /* set bell duration in msec */
1486 if (vc->vc_npar >= 1)
1487 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1488 vc->vc_par[1] * HZ / 1000 : 0;
1489 else
1490 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1491 break;
1492 case 12: /* bring specified console to the front */
1493 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1494 set_console(vc->vc_par[1] - 1);
1495 break;
1496 case 13: /* unblank the screen */
1497 poke_blanked_console();
1498 break;
1499 case 14: /* set vesa powerdown interval */
1500 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1501 break;
1502 case 15: /* activate the previous console */
1503 set_console(last_console);
1504 break;
1505 }
1506 }
1507
1508 /* console_lock is held */
1509 static void csi_at(struct vc_data *vc, unsigned int nr)
1510 {
1511 if (nr > vc->vc_cols - vc->vc_x)
1512 nr = vc->vc_cols - vc->vc_x;
1513 else if (!nr)
1514 nr = 1;
1515 insert_char(vc, nr);
1516 }
1517
1518 /* console_lock is held */
1519 static void csi_L(struct vc_data *vc, unsigned int nr)
1520 {
1521 if (nr > vc->vc_rows - vc->vc_y)
1522 nr = vc->vc_rows - vc->vc_y;
1523 else if (!nr)
1524 nr = 1;
1525 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1526 vc->vc_need_wrap = 0;
1527 }
1528
1529 /* console_lock is held */
1530 static void csi_P(struct vc_data *vc, unsigned int nr)
1531 {
1532 if (nr > vc->vc_cols - vc->vc_x)
1533 nr = vc->vc_cols - vc->vc_x;
1534 else if (!nr)
1535 nr = 1;
1536 delete_char(vc, nr);
1537 }
1538
1539 /* console_lock is held */
1540 static void csi_M(struct vc_data *vc, unsigned int nr)
1541 {
1542 if (nr > vc->vc_rows - vc->vc_y)
1543 nr = vc->vc_rows - vc->vc_y;
1544 else if (!nr)
1545 nr=1;
1546 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1547 vc->vc_need_wrap = 0;
1548 }
1549
1550 /* console_lock is held (except via vc_init->reset_terminal */
1551 static void save_cur(struct vc_data *vc)
1552 {
1553 vc->vc_saved_x = vc->vc_x;
1554 vc->vc_saved_y = vc->vc_y;
1555 vc->vc_s_intensity = vc->vc_intensity;
1556 vc->vc_s_italic = vc->vc_italic;
1557 vc->vc_s_underline = vc->vc_underline;
1558 vc->vc_s_blink = vc->vc_blink;
1559 vc->vc_s_reverse = vc->vc_reverse;
1560 vc->vc_s_charset = vc->vc_charset;
1561 vc->vc_s_color = vc->vc_color;
1562 vc->vc_saved_G0 = vc->vc_G0_charset;
1563 vc->vc_saved_G1 = vc->vc_G1_charset;
1564 }
1565
1566 /* console_lock is held */
1567 static void restore_cur(struct vc_data *vc)
1568 {
1569 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1570 vc->vc_intensity = vc->vc_s_intensity;
1571 vc->vc_italic = vc->vc_s_italic;
1572 vc->vc_underline = vc->vc_s_underline;
1573 vc->vc_blink = vc->vc_s_blink;
1574 vc->vc_reverse = vc->vc_s_reverse;
1575 vc->vc_charset = vc->vc_s_charset;
1576 vc->vc_color = vc->vc_s_color;
1577 vc->vc_G0_charset = vc->vc_saved_G0;
1578 vc->vc_G1_charset = vc->vc_saved_G1;
1579 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1580 update_attr(vc);
1581 vc->vc_need_wrap = 0;
1582 }
1583
1584 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1585 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1586 ESpalette };
1587
1588 /* console_lock is held (except via vc_init()) */
1589 static void reset_terminal(struct vc_data *vc, int do_clear)
1590 {
1591 vc->vc_top = 0;
1592 vc->vc_bottom = vc->vc_rows;
1593 vc->vc_state = ESnormal;
1594 vc->vc_ques = 0;
1595 vc->vc_translate = set_translate(LAT1_MAP, vc);
1596 vc->vc_G0_charset = LAT1_MAP;
1597 vc->vc_G1_charset = GRAF_MAP;
1598 vc->vc_charset = 0;
1599 vc->vc_need_wrap = 0;
1600 vc->vc_report_mouse = 0;
1601 vc->vc_utf = default_utf8;
1602 vc->vc_utf_count = 0;
1603
1604 vc->vc_disp_ctrl = 0;
1605 vc->vc_toggle_meta = 0;
1606
1607 vc->vc_decscnm = 0;
1608 vc->vc_decom = 0;
1609 vc->vc_decawm = 1;
1610 vc->vc_deccm = global_cursor_default;
1611 vc->vc_decim = 0;
1612
1613 vt_reset_keyboard(vc->vc_num);
1614
1615 vc->vc_cursor_type = cur_default;
1616 vc->vc_complement_mask = vc->vc_s_complement_mask;
1617
1618 default_attr(vc);
1619 update_attr(vc);
1620
1621 vc->vc_tab_stop[0] = 0x01010100;
1622 vc->vc_tab_stop[1] =
1623 vc->vc_tab_stop[2] =
1624 vc->vc_tab_stop[3] =
1625 vc->vc_tab_stop[4] =
1626 vc->vc_tab_stop[5] =
1627 vc->vc_tab_stop[6] =
1628 vc->vc_tab_stop[7] = 0x01010101;
1629
1630 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1631 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1632
1633 gotoxy(vc, 0, 0);
1634 save_cur(vc);
1635 if (do_clear)
1636 csi_J(vc, 2);
1637 }
1638
1639 /* console_lock is held */
1640 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1641 {
1642 /*
1643 * Control characters can be used in the _middle_
1644 * of an escape sequence.
1645 */
1646 switch (c) {
1647 case 0:
1648 return;
1649 case 7:
1650 if (vc->vc_bell_duration)
1651 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1652 return;
1653 case 8:
1654 bs(vc);
1655 return;
1656 case 9:
1657 vc->vc_pos -= (vc->vc_x << 1);
1658 while (vc->vc_x < vc->vc_cols - 1) {
1659 vc->vc_x++;
1660 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1661 break;
1662 }
1663 vc->vc_pos += (vc->vc_x << 1);
1664 notify_write(vc, '\t');
1665 return;
1666 case 10: case 11: case 12:
1667 lf(vc);
1668 if (!is_kbd(vc, lnm))
1669 return;
1670 case 13:
1671 cr(vc);
1672 return;
1673 case 14:
1674 vc->vc_charset = 1;
1675 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1676 vc->vc_disp_ctrl = 1;
1677 return;
1678 case 15:
1679 vc->vc_charset = 0;
1680 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1681 vc->vc_disp_ctrl = 0;
1682 return;
1683 case 24: case 26:
1684 vc->vc_state = ESnormal;
1685 return;
1686 case 27:
1687 vc->vc_state = ESesc;
1688 return;
1689 case 127:
1690 del(vc);
1691 return;
1692 case 128+27:
1693 vc->vc_state = ESsquare;
1694 return;
1695 }
1696 switch(vc->vc_state) {
1697 case ESesc:
1698 vc->vc_state = ESnormal;
1699 switch (c) {
1700 case '[':
1701 vc->vc_state = ESsquare;
1702 return;
1703 case ']':
1704 vc->vc_state = ESnonstd;
1705 return;
1706 case '%':
1707 vc->vc_state = ESpercent;
1708 return;
1709 case 'E':
1710 cr(vc);
1711 lf(vc);
1712 return;
1713 case 'M':
1714 ri(vc);
1715 return;
1716 case 'D':
1717 lf(vc);
1718 return;
1719 case 'H':
1720 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1721 return;
1722 case 'Z':
1723 respond_ID(tty);
1724 return;
1725 case '7':
1726 save_cur(vc);
1727 return;
1728 case '8':
1729 restore_cur(vc);
1730 return;
1731 case '(':
1732 vc->vc_state = ESsetG0;
1733 return;
1734 case ')':
1735 vc->vc_state = ESsetG1;
1736 return;
1737 case '#':
1738 vc->vc_state = EShash;
1739 return;
1740 case 'c':
1741 reset_terminal(vc, 1);
1742 return;
1743 case '>': /* Numeric keypad */
1744 clr_kbd(vc, kbdapplic);
1745 return;
1746 case '=': /* Appl. keypad */
1747 set_kbd(vc, kbdapplic);
1748 return;
1749 }
1750 return;
1751 case ESnonstd:
1752 if (c=='P') { /* palette escape sequence */
1753 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1754 vc->vc_par[vc->vc_npar] = 0;
1755 vc->vc_npar = 0;
1756 vc->vc_state = ESpalette;
1757 return;
1758 } else if (c=='R') { /* reset palette */
1759 reset_palette(vc);
1760 vc->vc_state = ESnormal;
1761 } else
1762 vc->vc_state = ESnormal;
1763 return;
1764 case ESpalette:
1765 if (isxdigit(c)) {
1766 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1767 if (vc->vc_npar == 7) {
1768 int i = vc->vc_par[0] * 3, j = 1;
1769 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1770 vc->vc_palette[i++] += vc->vc_par[j++];
1771 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1772 vc->vc_palette[i++] += vc->vc_par[j++];
1773 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1774 vc->vc_palette[i] += vc->vc_par[j];
1775 set_palette(vc);
1776 vc->vc_state = ESnormal;
1777 }
1778 } else
1779 vc->vc_state = ESnormal;
1780 return;
1781 case ESsquare:
1782 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1783 vc->vc_par[vc->vc_npar] = 0;
1784 vc->vc_npar = 0;
1785 vc->vc_state = ESgetpars;
1786 if (c == '[') { /* Function key */
1787 vc->vc_state=ESfunckey;
1788 return;
1789 }
1790 vc->vc_ques = (c == '?');
1791 if (vc->vc_ques)
1792 return;
1793 case ESgetpars:
1794 if (c == ';' && vc->vc_npar < NPAR - 1) {
1795 vc->vc_npar++;
1796 return;
1797 } else if (c>='0' && c<='9') {
1798 vc->vc_par[vc->vc_npar] *= 10;
1799 vc->vc_par[vc->vc_npar] += c - '0';
1800 return;
1801 } else
1802 vc->vc_state = ESgotpars;
1803 case ESgotpars:
1804 vc->vc_state = ESnormal;
1805 switch(c) {
1806 case 'h':
1807 set_mode(vc, 1);
1808 return;
1809 case 'l':
1810 set_mode(vc, 0);
1811 return;
1812 case 'c':
1813 if (vc->vc_ques) {
1814 if (vc->vc_par[0])
1815 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1816 else
1817 vc->vc_cursor_type = cur_default;
1818 return;
1819 }
1820 break;
1821 case 'm':
1822 if (vc->vc_ques) {
1823 clear_selection();
1824 if (vc->vc_par[0])
1825 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1826 else
1827 vc->vc_complement_mask = vc->vc_s_complement_mask;
1828 return;
1829 }
1830 break;
1831 case 'n':
1832 if (!vc->vc_ques) {
1833 if (vc->vc_par[0] == 5)
1834 status_report(tty);
1835 else if (vc->vc_par[0] == 6)
1836 cursor_report(vc, tty);
1837 }
1838 return;
1839 }
1840 if (vc->vc_ques) {
1841 vc->vc_ques = 0;
1842 return;
1843 }
1844 switch(c) {
1845 case 'G': case '`':
1846 if (vc->vc_par[0])
1847 vc->vc_par[0]--;
1848 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1849 return;
1850 case 'A':
1851 if (!vc->vc_par[0])
1852 vc->vc_par[0]++;
1853 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1854 return;
1855 case 'B': case 'e':
1856 if (!vc->vc_par[0])
1857 vc->vc_par[0]++;
1858 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1859 return;
1860 case 'C': case 'a':
1861 if (!vc->vc_par[0])
1862 vc->vc_par[0]++;
1863 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1864 return;
1865 case 'D':
1866 if (!vc->vc_par[0])
1867 vc->vc_par[0]++;
1868 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1869 return;
1870 case 'E':
1871 if (!vc->vc_par[0])
1872 vc->vc_par[0]++;
1873 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1874 return;
1875 case 'F':
1876 if (!vc->vc_par[0])
1877 vc->vc_par[0]++;
1878 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1879 return;
1880 case 'd':
1881 if (vc->vc_par[0])
1882 vc->vc_par[0]--;
1883 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1884 return;
1885 case 'H': case 'f':
1886 if (vc->vc_par[0])
1887 vc->vc_par[0]--;
1888 if (vc->vc_par[1])
1889 vc->vc_par[1]--;
1890 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1891 return;
1892 case 'J':
1893 csi_J(vc, vc->vc_par[0]);
1894 return;
1895 case 'K':
1896 csi_K(vc, vc->vc_par[0]);
1897 return;
1898 case 'L':
1899 csi_L(vc, vc->vc_par[0]);
1900 return;
1901 case 'M':
1902 csi_M(vc, vc->vc_par[0]);
1903 return;
1904 case 'P':
1905 csi_P(vc, vc->vc_par[0]);
1906 return;
1907 case 'c':
1908 if (!vc->vc_par[0])
1909 respond_ID(tty);
1910 return;
1911 case 'g':
1912 if (!vc->vc_par[0])
1913 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1914 else if (vc->vc_par[0] == 3) {
1915 vc->vc_tab_stop[0] =
1916 vc->vc_tab_stop[1] =
1917 vc->vc_tab_stop[2] =
1918 vc->vc_tab_stop[3] =
1919 vc->vc_tab_stop[4] =
1920 vc->vc_tab_stop[5] =
1921 vc->vc_tab_stop[6] =
1922 vc->vc_tab_stop[7] = 0;
1923 }
1924 return;
1925 case 'm':
1926 csi_m(vc);
1927 return;
1928 case 'q': /* DECLL - but only 3 leds */
1929 /* map 0,1,2,3 to 0,1,2,4 */
1930 if (vc->vc_par[0] < 4)
1931 vt_set_led_state(vc->vc_num,
1932 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1933 return;
1934 case 'r':
1935 if (!vc->vc_par[0])
1936 vc->vc_par[0]++;
1937 if (!vc->vc_par[1])
1938 vc->vc_par[1] = vc->vc_rows;
1939 /* Minimum allowed region is 2 lines */
1940 if (vc->vc_par[0] < vc->vc_par[1] &&
1941 vc->vc_par[1] <= vc->vc_rows) {
1942 vc->vc_top = vc->vc_par[0] - 1;
1943 vc->vc_bottom = vc->vc_par[1];
1944 gotoxay(vc, 0, 0);
1945 }
1946 return;
1947 case 's':
1948 save_cur(vc);
1949 return;
1950 case 'u':
1951 restore_cur(vc);
1952 return;
1953 case 'X':
1954 csi_X(vc, vc->vc_par[0]);
1955 return;
1956 case '@':
1957 csi_at(vc, vc->vc_par[0]);
1958 return;
1959 case ']': /* setterm functions */
1960 setterm_command(vc);
1961 return;
1962 }
1963 return;
1964 case ESpercent:
1965 vc->vc_state = ESnormal;
1966 switch (c) {
1967 case '@': /* defined in ISO 2022 */
1968 vc->vc_utf = 0;
1969 return;
1970 case 'G': /* prelim official escape code */
1971 case '8': /* retained for compatibility */
1972 vc->vc_utf = 1;
1973 return;
1974 }
1975 return;
1976 case ESfunckey:
1977 vc->vc_state = ESnormal;
1978 return;
1979 case EShash:
1980 vc->vc_state = ESnormal;
1981 if (c == '8') {
1982 /* DEC screen alignment test. kludge :-) */
1983 vc->vc_video_erase_char =
1984 (vc->vc_video_erase_char & 0xff00) | 'E';
1985 csi_J(vc, 2);
1986 vc->vc_video_erase_char =
1987 (vc->vc_video_erase_char & 0xff00) | ' ';
1988 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1989 }
1990 return;
1991 case ESsetG0:
1992 if (c == '0')
1993 vc->vc_G0_charset = GRAF_MAP;
1994 else if (c == 'B')
1995 vc->vc_G0_charset = LAT1_MAP;
1996 else if (c == 'U')
1997 vc->vc_G0_charset = IBMPC_MAP;
1998 else if (c == 'K')
1999 vc->vc_G0_charset = USER_MAP;
2000 if (vc->vc_charset == 0)
2001 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2002 vc->vc_state = ESnormal;
2003 return;
2004 case ESsetG1:
2005 if (c == '0')
2006 vc->vc_G1_charset = GRAF_MAP;
2007 else if (c == 'B')
2008 vc->vc_G1_charset = LAT1_MAP;
2009 else if (c == 'U')
2010 vc->vc_G1_charset = IBMPC_MAP;
2011 else if (c == 'K')
2012 vc->vc_G1_charset = USER_MAP;
2013 if (vc->vc_charset == 1)
2014 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2015 vc->vc_state = ESnormal;
2016 return;
2017 default:
2018 vc->vc_state = ESnormal;
2019 }
2020 }
2021
2022 /* is_double_width() is based on the wcwidth() implementation by
2023 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2024 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2025 */
2026 struct interval {
2027 uint32_t first;
2028 uint32_t last;
2029 };
2030
2031 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2032 {
2033 int min = 0;
2034 int mid;
2035
2036 if (ucs < table[0].first || ucs > table[max].last)
2037 return 0;
2038 while (max >= min) {
2039 mid = (min + max) / 2;
2040 if (ucs > table[mid].last)
2041 min = mid + 1;
2042 else if (ucs < table[mid].first)
2043 max = mid - 1;
2044 else
2045 return 1;
2046 }
2047 return 0;
2048 }
2049
2050 static int is_double_width(uint32_t ucs)
2051 {
2052 static const struct interval double_width[] = {
2053 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2054 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2055 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2056 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2057 };
2058 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2059 }
2060
2061 /* acquires console_lock */
2062 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2063 {
2064 #ifdef VT_BUF_VRAM_ONLY
2065 #define FLUSH do { } while(0);
2066 #else
2067 #define FLUSH if (draw_x >= 0) { \
2068 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2069 draw_x = -1; \
2070 }
2071 #endif
2072
2073 int c, tc, ok, n = 0, draw_x = -1;
2074 unsigned int currcons;
2075 unsigned long draw_from = 0, draw_to = 0;
2076 struct vc_data *vc;
2077 unsigned char vc_attr;
2078 struct vt_notifier_param param;
2079 uint8_t rescan;
2080 uint8_t inverse;
2081 uint8_t width;
2082 u16 himask, charmask;
2083
2084 if (in_interrupt())
2085 return count;
2086
2087 might_sleep();
2088
2089 console_lock();
2090 vc = tty->driver_data;
2091 if (vc == NULL) {
2092 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2093 console_unlock();
2094 return 0;
2095 }
2096
2097 currcons = vc->vc_num;
2098 if (!vc_cons_allocated(currcons)) {
2099 /* could this happen? */
2100 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2101 console_unlock();
2102 return 0;
2103 }
2104
2105 himask = vc->vc_hi_font_mask;
2106 charmask = himask ? 0x1ff : 0xff;
2107
2108 /* undraw cursor first */
2109 if (IS_FG(vc))
2110 hide_cursor(vc);
2111
2112 param.vc = vc;
2113
2114 while (!tty->stopped && count) {
2115 int orig = *buf;
2116 c = orig;
2117 buf++;
2118 n++;
2119 count--;
2120 rescan = 0;
2121 inverse = 0;
2122 width = 1;
2123
2124 /* Do no translation at all in control states */
2125 if (vc->vc_state != ESnormal) {
2126 tc = c;
2127 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2128 /* Combine UTF-8 into Unicode in vc_utf_char.
2129 * vc_utf_count is the number of continuation bytes still
2130 * expected to arrive.
2131 * vc_npar is the number of continuation bytes arrived so
2132 * far
2133 */
2134 rescan_last_byte:
2135 if ((c & 0xc0) == 0x80) {
2136 /* Continuation byte received */
2137 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2138 if (vc->vc_utf_count) {
2139 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2140 vc->vc_npar++;
2141 if (--vc->vc_utf_count) {
2142 /* Still need some bytes */
2143 continue;
2144 }
2145 /* Got a whole character */
2146 c = vc->vc_utf_char;
2147 /* Reject overlong sequences */
2148 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2149 c > utf8_length_changes[vc->vc_npar])
2150 c = 0xfffd;
2151 } else {
2152 /* Unexpected continuation byte */
2153 vc->vc_utf_count = 0;
2154 c = 0xfffd;
2155 }
2156 } else {
2157 /* Single ASCII byte or first byte of a sequence received */
2158 if (vc->vc_utf_count) {
2159 /* Continuation byte expected */
2160 rescan = 1;
2161 vc->vc_utf_count = 0;
2162 c = 0xfffd;
2163 } else if (c > 0x7f) {
2164 /* First byte of a multibyte sequence received */
2165 vc->vc_npar = 0;
2166 if ((c & 0xe0) == 0xc0) {
2167 vc->vc_utf_count = 1;
2168 vc->vc_utf_char = (c & 0x1f);
2169 } else if ((c & 0xf0) == 0xe0) {
2170 vc->vc_utf_count = 2;
2171 vc->vc_utf_char = (c & 0x0f);
2172 } else if ((c & 0xf8) == 0xf0) {
2173 vc->vc_utf_count = 3;
2174 vc->vc_utf_char = (c & 0x07);
2175 } else if ((c & 0xfc) == 0xf8) {
2176 vc->vc_utf_count = 4;
2177 vc->vc_utf_char = (c & 0x03);
2178 } else if ((c & 0xfe) == 0xfc) {
2179 vc->vc_utf_count = 5;
2180 vc->vc_utf_char = (c & 0x01);
2181 } else {
2182 /* 254 and 255 are invalid */
2183 c = 0xfffd;
2184 }
2185 if (vc->vc_utf_count) {
2186 /* Still need some bytes */
2187 continue;
2188 }
2189 }
2190 /* Nothing to do if an ASCII byte was received */
2191 }
2192 /* End of UTF-8 decoding. */
2193 /* c is the received character, or U+FFFD for invalid sequences. */
2194 /* Replace invalid Unicode code points with U+FFFD too */
2195 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2196 c = 0xfffd;
2197 tc = c;
2198 } else { /* no utf or alternate charset mode */
2199 tc = vc_translate(vc, c);
2200 }
2201
2202 param.c = tc;
2203 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2204 &param) == NOTIFY_STOP)
2205 continue;
2206
2207 /* If the original code was a control character we
2208 * only allow a glyph to be displayed if the code is
2209 * not normally used (such as for cursor movement) or
2210 * if the disp_ctrl mode has been explicitly enabled.
2211 * Certain characters (as given by the CTRL_ALWAYS
2212 * bitmap) are always displayed as control characters,
2213 * as the console would be pretty useless without
2214 * them; to display an arbitrary font position use the
2215 * direct-to-font zone in UTF-8 mode.
2216 */
2217 ok = tc && (c >= 32 ||
2218 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2219 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2220 && (c != 127 || vc->vc_disp_ctrl)
2221 && (c != 128+27);
2222
2223 if (vc->vc_state == ESnormal && ok) {
2224 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2225 if (is_double_width(c))
2226 width = 2;
2227 }
2228 /* Now try to find out how to display it */
2229 tc = conv_uni_to_pc(vc, tc);
2230 if (tc & ~charmask) {
2231 if (tc == -1 || tc == -2) {
2232 continue; /* nothing to display */
2233 }
2234 /* Glyph not found */
2235 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2236 /* In legacy mode use the glyph we get by a 1:1 mapping.
2237 This would make absolutely no sense with Unicode in mind,
2238 but do this for ASCII characters since a font may lack
2239 Unicode mapping info and we don't want to end up with
2240 having question marks only. */
2241 tc = c;
2242 } else {
2243 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2244 tc = conv_uni_to_pc(vc, 0xfffd);
2245 if (tc < 0) {
2246 inverse = 1;
2247 tc = conv_uni_to_pc(vc, '?');
2248 if (tc < 0) tc = '?';
2249 }
2250 }
2251 }
2252
2253 if (!inverse) {
2254 vc_attr = vc->vc_attr;
2255 } else {
2256 /* invert vc_attr */
2257 if (!vc->vc_can_do_color) {
2258 vc_attr = (vc->vc_attr) ^ 0x08;
2259 } else if (vc->vc_hi_font_mask == 0x100) {
2260 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2261 } else {
2262 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2263 }
2264 FLUSH
2265 }
2266
2267 while (1) {
2268 if (vc->vc_need_wrap || vc->vc_decim)
2269 FLUSH
2270 if (vc->vc_need_wrap) {
2271 cr(vc);
2272 lf(vc);
2273 }
2274 if (vc->vc_decim)
2275 insert_char(vc, 1);
2276 scr_writew(himask ?
2277 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2278 (vc_attr << 8) + tc,
2279 (u16 *) vc->vc_pos);
2280 if (DO_UPDATE(vc) && draw_x < 0) {
2281 draw_x = vc->vc_x;
2282 draw_from = vc->vc_pos;
2283 }
2284 if (vc->vc_x == vc->vc_cols - 1) {
2285 vc->vc_need_wrap = vc->vc_decawm;
2286 draw_to = vc->vc_pos + 2;
2287 } else {
2288 vc->vc_x++;
2289 draw_to = (vc->vc_pos += 2);
2290 }
2291
2292 if (!--width) break;
2293
2294 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2295 if (tc < 0) tc = ' ';
2296 }
2297 notify_write(vc, c);
2298
2299 if (inverse) {
2300 FLUSH
2301 }
2302
2303 if (rescan) {
2304 rescan = 0;
2305 inverse = 0;
2306 width = 1;
2307 c = orig;
2308 goto rescan_last_byte;
2309 }
2310 continue;
2311 }
2312 FLUSH
2313 do_con_trol(tty, vc, orig);
2314 }
2315 FLUSH
2316 console_conditional_schedule();
2317 console_unlock();
2318 notify_update(vc);
2319 return n;
2320 #undef FLUSH
2321 }
2322
2323 /*
2324 * This is the console switching callback.
2325 *
2326 * Doing console switching in a process context allows
2327 * us to do the switches asynchronously (needed when we want
2328 * to switch due to a keyboard interrupt). Synchronization
2329 * with other console code and prevention of re-entrancy is
2330 * ensured with console_lock.
2331 */
2332 static void console_callback(struct work_struct *ignored)
2333 {
2334 console_lock();
2335
2336 if (want_console >= 0) {
2337 if (want_console != fg_console &&
2338 vc_cons_allocated(want_console)) {
2339 hide_cursor(vc_cons[fg_console].d);
2340 change_console(vc_cons[want_console].d);
2341 /* we only changed when the console had already
2342 been allocated - a new console is not created
2343 in an interrupt routine */
2344 }
2345 want_console = -1;
2346 }
2347 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2348 do_poke_blanked_console = 0;
2349 poke_blanked_console();
2350 }
2351 if (scrollback_delta) {
2352 struct vc_data *vc = vc_cons[fg_console].d;
2353 clear_selection();
2354 if (vc->vc_mode == KD_TEXT)
2355 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2356 scrollback_delta = 0;
2357 }
2358 if (blank_timer_expired) {
2359 do_blank_screen(0);
2360 blank_timer_expired = 0;
2361 }
2362 notify_update(vc_cons[fg_console].d);
2363
2364 console_unlock();
2365 }
2366
2367 int set_console(int nr)
2368 {
2369 struct vc_data *vc = vc_cons[fg_console].d;
2370
2371 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2372 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2373
2374 /*
2375 * Console switch will fail in console_callback() or
2376 * change_console() so there is no point scheduling
2377 * the callback
2378 *
2379 * Existing set_console() users don't check the return
2380 * value so this shouldn't break anything
2381 */
2382 return -EINVAL;
2383 }
2384
2385 want_console = nr;
2386 schedule_console_callback();
2387
2388 return 0;
2389 }
2390
2391 struct tty_driver *console_driver;
2392
2393 #ifdef CONFIG_VT_CONSOLE
2394
2395 /**
2396 * vt_kmsg_redirect() - Sets/gets the kernel message console
2397 * @new: The new virtual terminal number or -1 if the console should stay
2398 * unchanged
2399 *
2400 * By default, the kernel messages are always printed on the current virtual
2401 * console. However, the user may modify that default with the
2402 * TIOCL_SETKMSGREDIRECT ioctl call.
2403 *
2404 * This function sets the kernel message console to be @new. It returns the old
2405 * virtual console number. The virtual terminal number 0 (both as parameter and
2406 * return value) means no redirection (i.e. always printed on the currently
2407 * active console).
2408 *
2409 * The parameter -1 means that only the current console is returned, but the
2410 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2411 * case to make the code more understandable.
2412 *
2413 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2414 * the parameter and always returns 0.
2415 */
2416 int vt_kmsg_redirect(int new)
2417 {
2418 static int kmsg_con;
2419
2420 if (new != -1)
2421 return xchg(&kmsg_con, new);
2422 else
2423 return kmsg_con;
2424 }
2425
2426 /*
2427 * Console on virtual terminal
2428 *
2429 * The console must be locked when we get here.
2430 */
2431
2432 static void vt_console_print(struct console *co, const char *b, unsigned count)
2433 {
2434 struct vc_data *vc = vc_cons[fg_console].d;
2435 unsigned char c;
2436 static DEFINE_SPINLOCK(printing_lock);
2437 const ushort *start;
2438 ushort cnt = 0;
2439 ushort myx;
2440 int kmsg_console;
2441
2442 /* console busy or not yet initialized */
2443 if (!printable)
2444 return;
2445 if (!spin_trylock(&printing_lock))
2446 return;
2447
2448 kmsg_console = vt_get_kmsg_redirect();
2449 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2450 vc = vc_cons[kmsg_console - 1].d;
2451
2452 /* read `x' only after setting currcons properly (otherwise
2453 the `x' macro will read the x of the foreground console). */
2454 myx = vc->vc_x;
2455
2456 if (!vc_cons_allocated(fg_console)) {
2457 /* impossible */
2458 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2459 goto quit;
2460 }
2461
2462 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2463 goto quit;
2464
2465 /* undraw cursor first */
2466 if (IS_FG(vc))
2467 hide_cursor(vc);
2468
2469 start = (ushort *)vc->vc_pos;
2470
2471 /* Contrived structure to try to emulate original need_wrap behaviour
2472 * Problems caused when we have need_wrap set on '\n' character */
2473 while (count--) {
2474 c = *b++;
2475 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2476 if (cnt > 0) {
2477 if (CON_IS_VISIBLE(vc))
2478 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2479 vc->vc_x += cnt;
2480 if (vc->vc_need_wrap)
2481 vc->vc_x--;
2482 cnt = 0;
2483 }
2484 if (c == 8) { /* backspace */
2485 bs(vc);
2486 start = (ushort *)vc->vc_pos;
2487 myx = vc->vc_x;
2488 continue;
2489 }
2490 if (c != 13)
2491 lf(vc);
2492 cr(vc);
2493 start = (ushort *)vc->vc_pos;
2494 myx = vc->vc_x;
2495 if (c == 10 || c == 13)
2496 continue;
2497 }
2498 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2499 notify_write(vc, c);
2500 cnt++;
2501 if (myx == vc->vc_cols - 1) {
2502 vc->vc_need_wrap = 1;
2503 continue;
2504 }
2505 vc->vc_pos += 2;
2506 myx++;
2507 }
2508 if (cnt > 0) {
2509 if (CON_IS_VISIBLE(vc))
2510 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2511 vc->vc_x += cnt;
2512 if (vc->vc_x == vc->vc_cols) {
2513 vc->vc_x--;
2514 vc->vc_need_wrap = 1;
2515 }
2516 }
2517 set_cursor(vc);
2518 notify_update(vc);
2519
2520 quit:
2521 spin_unlock(&printing_lock);
2522 }
2523
2524 static struct tty_driver *vt_console_device(struct console *c, int *index)
2525 {
2526 *index = c->index ? c->index-1 : fg_console;
2527 return console_driver;
2528 }
2529
2530 static struct console vt_console_driver = {
2531 .name = "tty",
2532 .write = vt_console_print,
2533 .device = vt_console_device,
2534 .unblank = unblank_screen,
2535 .flags = CON_PRINTBUFFER,
2536 .index = -1,
2537 };
2538 #endif
2539
2540 /*
2541 * Handling of Linux-specific VC ioctls
2542 */
2543
2544 /*
2545 * Generally a bit racy with respect to console_lock();.
2546 *
2547 * There are some functions which don't need it.
2548 *
2549 * There are some functions which can sleep for arbitrary periods
2550 * (paste_selection) but we don't need the lock there anyway.
2551 *
2552 * set_selection has locking, and definitely needs it
2553 */
2554
2555 int tioclinux(struct tty_struct *tty, unsigned long arg)
2556 {
2557 char type, data;
2558 char __user *p = (char __user *)arg;
2559 int lines;
2560 int ret;
2561
2562 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2563 return -EPERM;
2564 if (get_user(type, p))
2565 return -EFAULT;
2566 ret = 0;
2567
2568 switch (type)
2569 {
2570 case TIOCL_SETSEL:
2571 console_lock();
2572 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2573 console_unlock();
2574 break;
2575 case TIOCL_PASTESEL:
2576 ret = paste_selection(tty);
2577 break;
2578 case TIOCL_UNBLANKSCREEN:
2579 console_lock();
2580 unblank_screen();
2581 console_unlock();
2582 break;
2583 case TIOCL_SELLOADLUT:
2584 console_lock();
2585 ret = sel_loadlut(p);
2586 console_unlock();
2587 break;
2588 case TIOCL_GETSHIFTSTATE:
2589
2590 /*
2591 * Make it possible to react to Shift+Mousebutton.
2592 * Note that 'shift_state' is an undocumented
2593 * kernel-internal variable; programs not closely
2594 * related to the kernel should not use this.
2595 */
2596 data = vt_get_shift_state();
2597 ret = __put_user(data, p);
2598 break;
2599 case TIOCL_GETMOUSEREPORTING:
2600 console_lock(); /* May be overkill */
2601 data = mouse_reporting();
2602 console_unlock();
2603 ret = __put_user(data, p);
2604 break;
2605 case TIOCL_SETVESABLANK:
2606 console_lock();
2607 ret = set_vesa_blanking(p);
2608 console_unlock();
2609 break;
2610 case TIOCL_GETKMSGREDIRECT:
2611 data = vt_get_kmsg_redirect();
2612 ret = __put_user(data, p);
2613 break;
2614 case TIOCL_SETKMSGREDIRECT:
2615 if (!capable(CAP_SYS_ADMIN)) {
2616 ret = -EPERM;
2617 } else {
2618 if (get_user(data, p+1))
2619 ret = -EFAULT;
2620 else
2621 vt_kmsg_redirect(data);
2622 }
2623 break;
2624 case TIOCL_GETFGCONSOLE:
2625 /* No locking needed as this is a transiently
2626 correct return anyway if the caller hasn't
2627 disabled switching */
2628 ret = fg_console;
2629 break;
2630 case TIOCL_SCROLLCONSOLE:
2631 if (get_user(lines, (s32 __user *)(p+4))) {
2632 ret = -EFAULT;
2633 } else {
2634 /* Need the console lock here. Note that lots
2635 of other calls need fixing before the lock
2636 is actually useful ! */
2637 console_lock();
2638 scrollfront(vc_cons[fg_console].d, lines);
2639 console_unlock();
2640 ret = 0;
2641 }
2642 break;
2643 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2644 console_lock();
2645 ignore_poke = 1;
2646 do_blank_screen(0);
2647 console_unlock();
2648 break;
2649 case TIOCL_BLANKEDSCREEN:
2650 ret = console_blanked;
2651 break;
2652 default:
2653 ret = -EINVAL;
2654 break;
2655 }
2656 return ret;
2657 }
2658
2659 /*
2660 * /dev/ttyN handling
2661 */
2662
2663 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2664 {
2665 int retval;
2666
2667 retval = do_con_write(tty, buf, count);
2668 con_flush_chars(tty);
2669
2670 return retval;
2671 }
2672
2673 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2674 {
2675 if (in_interrupt())
2676 return 0; /* n_r3964 calls put_char() from interrupt context */
2677 return do_con_write(tty, &ch, 1);
2678 }
2679
2680 static int con_write_room(struct tty_struct *tty)
2681 {
2682 if (tty->stopped)
2683 return 0;
2684 return 32768; /* No limit, really; we're not buffering */
2685 }
2686
2687 static int con_chars_in_buffer(struct tty_struct *tty)
2688 {
2689 return 0; /* we're not buffering */
2690 }
2691
2692 /*
2693 * con_throttle and con_unthrottle are only used for
2694 * paste_selection(), which has to stuff in a large number of
2695 * characters...
2696 */
2697 static void con_throttle(struct tty_struct *tty)
2698 {
2699 }
2700
2701 static void con_unthrottle(struct tty_struct *tty)
2702 {
2703 struct vc_data *vc = tty->driver_data;
2704
2705 wake_up_interruptible(&vc->paste_wait);
2706 }
2707
2708 /*
2709 * Turn the Scroll-Lock LED on when the tty is stopped
2710 */
2711 static void con_stop(struct tty_struct *tty)
2712 {
2713 int console_num;
2714 if (!tty)
2715 return;
2716 console_num = tty->index;
2717 if (!vc_cons_allocated(console_num))
2718 return;
2719 vt_kbd_con_stop(console_num);
2720 }
2721
2722 /*
2723 * Turn the Scroll-Lock LED off when the console is started
2724 */
2725 static void con_start(struct tty_struct *tty)
2726 {
2727 int console_num;
2728 if (!tty)
2729 return;
2730 console_num = tty->index;
2731 if (!vc_cons_allocated(console_num))
2732 return;
2733 vt_kbd_con_start(console_num);
2734 }
2735
2736 static void con_flush_chars(struct tty_struct *tty)
2737 {
2738 struct vc_data *vc;
2739
2740 if (in_interrupt()) /* from flush_to_ldisc */
2741 return;
2742
2743 /* if we race with con_close(), vt may be null */
2744 console_lock();
2745 vc = tty->driver_data;
2746 if (vc)
2747 set_cursor(vc);
2748 console_unlock();
2749 }
2750
2751 /*
2752 * Allocate the console screen memory.
2753 */
2754 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2755 {
2756 unsigned int currcons = tty->index;
2757 struct vc_data *vc;
2758 int ret;
2759
2760 console_lock();
2761 ret = vc_allocate(currcons);
2762 if (ret)
2763 goto unlock;
2764
2765 vc = vc_cons[currcons].d;
2766
2767 /* Still being freed */
2768 if (vc->port.tty) {
2769 ret = -ERESTARTSYS;
2770 goto unlock;
2771 }
2772
2773 ret = tty_port_install(&vc->port, driver, tty);
2774 if (ret)
2775 goto unlock;
2776
2777 tty->driver_data = vc;
2778 vc->port.tty = tty;
2779
2780 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2781 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2782 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2783 }
2784 if (vc->vc_utf)
2785 tty->termios.c_iflag |= IUTF8;
2786 else
2787 tty->termios.c_iflag &= ~IUTF8;
2788 unlock:
2789 console_unlock();
2790 return ret;
2791 }
2792
2793 static int con_open(struct tty_struct *tty, struct file *filp)
2794 {
2795 /* everything done in install */
2796 return 0;
2797 }
2798
2799
2800 static void con_close(struct tty_struct *tty, struct file *filp)
2801 {
2802 /* Nothing to do - we defer to shutdown */
2803 }
2804
2805 static void con_shutdown(struct tty_struct *tty)
2806 {
2807 struct vc_data *vc = tty->driver_data;
2808 BUG_ON(vc == NULL);
2809 console_lock();
2810 vc->port.tty = NULL;
2811 console_unlock();
2812 }
2813
2814 static int default_italic_color = 2; // green (ASCII)
2815 static int default_underline_color = 3; // cyan (ASCII)
2816 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2817 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2818
2819 static void vc_init(struct vc_data *vc, unsigned int rows,
2820 unsigned int cols, int do_clear)
2821 {
2822 int j, k ;
2823
2824 vc->vc_cols = cols;
2825 vc->vc_rows = rows;
2826 vc->vc_size_row = cols << 1;
2827 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2828
2829 set_origin(vc);
2830 vc->vc_pos = vc->vc_origin;
2831 reset_vc(vc);
2832 for (j=k=0; j<16; j++) {
2833 vc->vc_palette[k++] = default_red[j] ;
2834 vc->vc_palette[k++] = default_grn[j] ;
2835 vc->vc_palette[k++] = default_blu[j] ;
2836 }
2837 vc->vc_def_color = 0x07; /* white */
2838 vc->vc_ulcolor = default_underline_color;
2839 vc->vc_itcolor = default_italic_color;
2840 vc->vc_halfcolor = 0x08; /* grey */
2841 init_waitqueue_head(&vc->paste_wait);
2842 reset_terminal(vc, do_clear);
2843 }
2844
2845 /*
2846 * This routine initializes console interrupts, and does nothing
2847 * else. If you want the screen to clear, call tty_write with
2848 * the appropriate escape-sequence.
2849 */
2850
2851 static int __init con_init(void)
2852 {
2853 const char *display_desc = NULL;
2854 struct vc_data *vc;
2855 unsigned int currcons = 0, i;
2856
2857 console_lock();
2858
2859 if (conswitchp)
2860 display_desc = conswitchp->con_startup();
2861 if (!display_desc) {
2862 fg_console = 0;
2863 console_unlock();
2864 return 0;
2865 }
2866
2867 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2868 struct con_driver *con_driver = &registered_con_driver[i];
2869
2870 if (con_driver->con == NULL) {
2871 con_driver->con = conswitchp;
2872 con_driver->desc = display_desc;
2873 con_driver->flag = CON_DRIVER_FLAG_INIT;
2874 con_driver->first = 0;
2875 con_driver->last = MAX_NR_CONSOLES - 1;
2876 break;
2877 }
2878 }
2879
2880 for (i = 0; i < MAX_NR_CONSOLES; i++)
2881 con_driver_map[i] = conswitchp;
2882
2883 if (blankinterval) {
2884 blank_state = blank_normal_wait;
2885 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2886 }
2887
2888 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2889 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2890 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2891 tty_port_init(&vc->port);
2892 visual_init(vc, currcons, 1);
2893 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2894 vc_init(vc, vc->vc_rows, vc->vc_cols,
2895 currcons || !vc->vc_sw->con_save_screen);
2896 }
2897 currcons = fg_console = 0;
2898 master_display_fg = vc = vc_cons[currcons].d;
2899 set_origin(vc);
2900 save_screen(vc);
2901 gotoxy(vc, vc->vc_x, vc->vc_y);
2902 csi_J(vc, 0);
2903 update_screen(vc);
2904 pr_info("Console: %s %s %dx%d\n",
2905 vc->vc_can_do_color ? "colour" : "mono",
2906 display_desc, vc->vc_cols, vc->vc_rows);
2907 printable = 1;
2908
2909 console_unlock();
2910
2911 #ifdef CONFIG_VT_CONSOLE
2912 register_console(&vt_console_driver);
2913 #endif
2914 return 0;
2915 }
2916 console_initcall(con_init);
2917
2918 static const struct tty_operations con_ops = {
2919 .install = con_install,
2920 .open = con_open,
2921 .close = con_close,
2922 .write = con_write,
2923 .write_room = con_write_room,
2924 .put_char = con_put_char,
2925 .flush_chars = con_flush_chars,
2926 .chars_in_buffer = con_chars_in_buffer,
2927 .ioctl = vt_ioctl,
2928 #ifdef CONFIG_COMPAT
2929 .compat_ioctl = vt_compat_ioctl,
2930 #endif
2931 .stop = con_stop,
2932 .start = con_start,
2933 .throttle = con_throttle,
2934 .unthrottle = con_unthrottle,
2935 .resize = vt_resize,
2936 .shutdown = con_shutdown
2937 };
2938
2939 static struct cdev vc0_cdev;
2940
2941 static ssize_t show_tty_active(struct device *dev,
2942 struct device_attribute *attr, char *buf)
2943 {
2944 return sprintf(buf, "tty%d\n", fg_console + 1);
2945 }
2946 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2947
2948 int __init vty_init(const struct file_operations *console_fops)
2949 {
2950 cdev_init(&vc0_cdev, console_fops);
2951 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2952 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2953 panic("Couldn't register /dev/tty0 driver\n");
2954 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2955 if (IS_ERR(tty0dev))
2956 tty0dev = NULL;
2957 else
2958 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2959
2960 vcs_init();
2961
2962 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2963 if (!console_driver)
2964 panic("Couldn't allocate console driver\n");
2965
2966 console_driver->name = "tty";
2967 console_driver->name_base = 1;
2968 console_driver->major = TTY_MAJOR;
2969 console_driver->minor_start = 1;
2970 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2971 console_driver->init_termios = tty_std_termios;
2972 if (default_utf8)
2973 console_driver->init_termios.c_iflag |= IUTF8;
2974 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2975 tty_set_operations(console_driver, &con_ops);
2976 if (tty_register_driver(console_driver))
2977 panic("Couldn't register console driver\n");
2978 kbd_init();
2979 console_map_init();
2980 #ifdef CONFIG_MDA_CONSOLE
2981 mda_console_init();
2982 #endif
2983 return 0;
2984 }
2985
2986 #ifndef VT_SINGLE_DRIVER
2987
2988 static struct class *vtconsole_class;
2989
2990 static int do_bind_con_driver(const struct consw *csw, int first, int last,
2991 int deflt)
2992 {
2993 struct module *owner = csw->owner;
2994 const char *desc = NULL;
2995 struct con_driver *con_driver;
2996 int i, j = -1, k = -1, retval = -ENODEV;
2997
2998 if (!try_module_get(owner))
2999 return -ENODEV;
3000
3001 WARN_CONSOLE_UNLOCKED();
3002
3003 /* check if driver is registered */
3004 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3005 con_driver = &registered_con_driver[i];
3006
3007 if (con_driver->con == csw) {
3008 desc = con_driver->desc;
3009 retval = 0;
3010 break;
3011 }
3012 }
3013
3014 if (retval)
3015 goto err;
3016
3017 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3018 csw->con_startup();
3019 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3020 }
3021
3022 if (deflt) {
3023 if (conswitchp)
3024 module_put(conswitchp->owner);
3025
3026 __module_get(owner);
3027 conswitchp = csw;
3028 }
3029
3030 first = max(first, con_driver->first);
3031 last = min(last, con_driver->last);
3032
3033 for (i = first; i <= last; i++) {
3034 int old_was_color;
3035 struct vc_data *vc = vc_cons[i].d;
3036
3037 if (con_driver_map[i])
3038 module_put(con_driver_map[i]->owner);
3039 __module_get(owner);
3040 con_driver_map[i] = csw;
3041
3042 if (!vc || !vc->vc_sw)
3043 continue;
3044
3045 j = i;
3046
3047 if (CON_IS_VISIBLE(vc)) {
3048 k = i;
3049 save_screen(vc);
3050 }
3051
3052 old_was_color = vc->vc_can_do_color;
3053 vc->vc_sw->con_deinit(vc);
3054 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3055 visual_init(vc, i, 0);
3056 set_origin(vc);
3057 update_attr(vc);
3058
3059 /* If the console changed between mono <-> color, then
3060 * the attributes in the screenbuf will be wrong. The
3061 * following resets all attributes to something sane.
3062 */
3063 if (old_was_color != vc->vc_can_do_color)
3064 clear_buffer_attributes(vc);
3065 }
3066
3067 pr_info("Console: switching ");
3068 if (!deflt)
3069 printk("consoles %d-%d ", first+1, last+1);
3070 if (j >= 0) {
3071 struct vc_data *vc = vc_cons[j].d;
3072
3073 printk("to %s %s %dx%d\n",
3074 vc->vc_can_do_color ? "colour" : "mono",
3075 desc, vc->vc_cols, vc->vc_rows);
3076
3077 if (k >= 0) {
3078 vc = vc_cons[k].d;
3079 update_screen(vc);
3080 }
3081 } else
3082 printk("to %s\n", desc);
3083
3084 retval = 0;
3085 err:
3086 module_put(owner);
3087 return retval;
3088 };
3089
3090
3091 static int bind_con_driver(const struct consw *csw, int first, int last,
3092 int deflt)
3093 {
3094 int ret;
3095
3096 console_lock();
3097 ret = do_bind_con_driver(csw, first, last, deflt);
3098 console_unlock();
3099 return ret;
3100 }
3101
3102 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3103 static int con_is_graphics(const struct consw *csw, int first, int last)
3104 {
3105 int i, retval = 0;
3106
3107 for (i = first; i <= last; i++) {
3108 struct vc_data *vc = vc_cons[i].d;
3109
3110 if (vc && vc->vc_mode == KD_GRAPHICS) {
3111 retval = 1;
3112 break;
3113 }
3114 }
3115
3116 return retval;
3117 }
3118
3119 /* unlocked version of unbind_con_driver() */
3120 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3121 {
3122 struct module *owner = csw->owner;
3123 const struct consw *defcsw = NULL;
3124 struct con_driver *con_driver = NULL, *con_back = NULL;
3125 int i, retval = -ENODEV;
3126
3127 if (!try_module_get(owner))
3128 return -ENODEV;
3129
3130 WARN_CONSOLE_UNLOCKED();
3131
3132 /* check if driver is registered and if it is unbindable */
3133 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3134 con_driver = &registered_con_driver[i];
3135
3136 if (con_driver->con == csw &&
3137 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3138 retval = 0;
3139 break;
3140 }
3141 }
3142
3143 if (retval)
3144 goto err;
3145
3146 retval = -ENODEV;
3147
3148 /* check if backup driver exists */
3149 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3150 con_back = &registered_con_driver[i];
3151
3152 if (con_back->con &&
3153 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3154 defcsw = con_back->con;
3155 retval = 0;
3156 break;
3157 }
3158 }
3159
3160 if (retval)
3161 goto err;
3162
3163 if (!con_is_bound(csw))
3164 goto err;
3165
3166 first = max(first, con_driver->first);
3167 last = min(last, con_driver->last);
3168
3169 for (i = first; i <= last; i++) {
3170 if (con_driver_map[i] == csw) {
3171 module_put(csw->owner);
3172 con_driver_map[i] = NULL;
3173 }
3174 }
3175
3176 if (!con_is_bound(defcsw)) {
3177 const struct consw *defconsw = conswitchp;
3178
3179 defcsw->con_startup();
3180 con_back->flag |= CON_DRIVER_FLAG_INIT;
3181 /*
3182 * vgacon may change the default driver to point
3183 * to dummycon, we restore it here...
3184 */
3185 conswitchp = defconsw;
3186 }
3187
3188 if (!con_is_bound(csw))
3189 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3190
3191 /* ignore return value, binding should not fail */
3192 do_bind_con_driver(defcsw, first, last, deflt);
3193 err:
3194 module_put(owner);
3195 return retval;
3196
3197 }
3198 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3199
3200 static int vt_bind(struct con_driver *con)
3201 {
3202 const struct consw *defcsw = NULL, *csw = NULL;
3203 int i, more = 1, first = -1, last = -1, deflt = 0;
3204
3205 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3206 con_is_graphics(con->con, con->first, con->last))
3207 goto err;
3208
3209 csw = con->con;
3210
3211 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3212 struct con_driver *con = &registered_con_driver[i];
3213
3214 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3215 defcsw = con->con;
3216 break;
3217 }
3218 }
3219
3220 if (!defcsw)
3221 goto err;
3222
3223 while (more) {
3224 more = 0;
3225
3226 for (i = con->first; i <= con->last; i++) {
3227 if (con_driver_map[i] == defcsw) {
3228 if (first == -1)
3229 first = i;
3230 last = i;
3231 more = 1;
3232 } else if (first != -1)
3233 break;
3234 }
3235
3236 if (first == 0 && last == MAX_NR_CONSOLES -1)
3237 deflt = 1;
3238
3239 if (first != -1)
3240 bind_con_driver(csw, first, last, deflt);
3241
3242 first = -1;
3243 last = -1;
3244 deflt = 0;
3245 }
3246
3247 err:
3248 return 0;
3249 }
3250
3251 static int vt_unbind(struct con_driver *con)
3252 {
3253 const struct consw *csw = NULL;
3254 int i, more = 1, first = -1, last = -1, deflt = 0;
3255
3256 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3257 con_is_graphics(con->con, con->first, con->last))
3258 goto err;
3259
3260 csw = con->con;
3261
3262 while (more) {
3263 more = 0;
3264
3265 for (i = con->first; i <= con->last; i++) {
3266 if (con_driver_map[i] == csw) {
3267 if (first == -1)
3268 first = i;
3269 last = i;
3270 more = 1;
3271 } else if (first != -1)
3272 break;
3273 }
3274
3275 if (first == 0 && last == MAX_NR_CONSOLES -1)
3276 deflt = 1;
3277
3278 if (first != -1) {
3279 console_lock();
3280 do_unbind_con_driver(csw, first, last, deflt);
3281 console_unlock();
3282 }
3283
3284 first = -1;
3285 last = -1;
3286 deflt = 0;
3287 }
3288
3289 err:
3290 return 0;
3291 }
3292 #else
3293 static inline int vt_bind(struct con_driver *con)
3294 {
3295 return 0;
3296 }
3297 static inline int vt_unbind(struct con_driver *con)
3298 {
3299 return 0;
3300 }
3301 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3302
3303 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3304 const char *buf, size_t count)
3305 {
3306 struct con_driver *con = dev_get_drvdata(dev);
3307 int bind = simple_strtoul(buf, NULL, 0);
3308
3309 if (bind)
3310 vt_bind(con);
3311 else
3312 vt_unbind(con);
3313
3314 return count;
3315 }
3316
3317 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3318 char *buf)
3319 {
3320 struct con_driver *con = dev_get_drvdata(dev);
3321 int bind = con_is_bound(con->con);
3322
3323 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3324 }
3325
3326 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3327 char *buf)
3328 {
3329 struct con_driver *con = dev_get_drvdata(dev);
3330
3331 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3332 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3333 con->desc);
3334
3335 }
3336
3337 static struct device_attribute device_attrs[] = {
3338 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3339 __ATTR(name, S_IRUGO, show_name, NULL),
3340 };
3341
3342 static int vtconsole_init_device(struct con_driver *con)
3343 {
3344 int i;
3345 int error = 0;
3346
3347 con->flag |= CON_DRIVER_FLAG_ATTR;
3348 dev_set_drvdata(con->dev, con);
3349 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3350 error = device_create_file(con->dev, &device_attrs[i]);
3351 if (error)
3352 break;
3353 }
3354
3355 if (error) {
3356 while (--i >= 0)
3357 device_remove_file(con->dev, &device_attrs[i]);
3358 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3359 }
3360
3361 return error;
3362 }
3363
3364 static void vtconsole_deinit_device(struct con_driver *con)
3365 {
3366 int i;
3367
3368 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3369 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3370 device_remove_file(con->dev, &device_attrs[i]);
3371 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3372 }
3373 }
3374
3375 /**
3376 * con_is_bound - checks if driver is bound to the console
3377 * @csw: console driver
3378 *
3379 * RETURNS: zero if unbound, nonzero if bound
3380 *
3381 * Drivers can call this and if zero, they should release
3382 * all resources allocated on con_startup()
3383 */
3384 int con_is_bound(const struct consw *csw)
3385 {
3386 int i, bound = 0;
3387
3388 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3389 if (con_driver_map[i] == csw) {
3390 bound = 1;
3391 break;
3392 }
3393 }
3394
3395 return bound;
3396 }
3397 EXPORT_SYMBOL(con_is_bound);
3398
3399 /**
3400 * con_debug_enter - prepare the console for the kernel debugger
3401 * @sw: console driver
3402 *
3403 * Called when the console is taken over by the kernel debugger, this
3404 * function needs to save the current console state, then put the console
3405 * into a state suitable for the kernel debugger.
3406 *
3407 * RETURNS:
3408 * Zero on success, nonzero if a failure occurred when trying to prepare
3409 * the console for the debugger.
3410 */
3411 int con_debug_enter(struct vc_data *vc)
3412 {
3413 int ret = 0;
3414
3415 saved_fg_console = fg_console;
3416 saved_last_console = last_console;
3417 saved_want_console = want_console;
3418 saved_vc_mode = vc->vc_mode;
3419 saved_console_blanked = console_blanked;
3420 vc->vc_mode = KD_TEXT;
3421 console_blanked = 0;
3422 if (vc->vc_sw->con_debug_enter)
3423 ret = vc->vc_sw->con_debug_enter(vc);
3424 #ifdef CONFIG_KGDB_KDB
3425 /* Set the initial LINES variable if it is not already set */
3426 if (vc->vc_rows < 999) {
3427 int linecount;
3428 char lns[4];
3429 const char *setargs[3] = {
3430 "set",
3431 "LINES",
3432 lns,
3433 };
3434 if (kdbgetintenv(setargs[0], &linecount)) {
3435 snprintf(lns, 4, "%i", vc->vc_rows);
3436 kdb_set(2, setargs);
3437 }
3438 }
3439 if (vc->vc_cols < 999) {
3440 int colcount;
3441 char cols[4];
3442 const char *setargs[3] = {
3443 "set",
3444 "COLUMNS",
3445 cols,
3446 };
3447 if (kdbgetintenv(setargs[0], &colcount)) {
3448 snprintf(cols, 4, "%i", vc->vc_cols);
3449 kdb_set(2, setargs);
3450 }
3451 }
3452 #endif /* CONFIG_KGDB_KDB */
3453 return ret;
3454 }
3455 EXPORT_SYMBOL_GPL(con_debug_enter);
3456
3457 /**
3458 * con_debug_leave - restore console state
3459 * @sw: console driver
3460 *
3461 * Restore the console state to what it was before the kernel debugger
3462 * was invoked.
3463 *
3464 * RETURNS:
3465 * Zero on success, nonzero if a failure occurred when trying to restore
3466 * the console.
3467 */
3468 int con_debug_leave(void)
3469 {
3470 struct vc_data *vc;
3471 int ret = 0;
3472
3473 fg_console = saved_fg_console;
3474 last_console = saved_last_console;
3475 want_console = saved_want_console;
3476 console_blanked = saved_console_blanked;
3477 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3478
3479 vc = vc_cons[fg_console].d;
3480 if (vc->vc_sw->con_debug_leave)
3481 ret = vc->vc_sw->con_debug_leave(vc);
3482 return ret;
3483 }
3484 EXPORT_SYMBOL_GPL(con_debug_leave);
3485
3486 static int do_register_con_driver(const struct consw *csw, int first, int last)
3487 {
3488 struct module *owner = csw->owner;
3489 struct con_driver *con_driver;
3490 const char *desc;
3491 int i, retval = 0;
3492
3493 WARN_CONSOLE_UNLOCKED();
3494
3495 if (!try_module_get(owner))
3496 return -ENODEV;
3497
3498 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3499 con_driver = &registered_con_driver[i];
3500
3501 /* already registered */
3502 if (con_driver->con == csw)
3503 retval = -EBUSY;
3504 }
3505
3506 if (retval)
3507 goto err;
3508
3509 desc = csw->con_startup();
3510
3511 if (!desc)
3512 goto err;
3513
3514 retval = -EINVAL;
3515
3516 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3517 con_driver = &registered_con_driver[i];
3518
3519 if (con_driver->con == NULL) {
3520 con_driver->con = csw;
3521 con_driver->desc = desc;
3522 con_driver->node = i;
3523 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3524 CON_DRIVER_FLAG_INIT;
3525 con_driver->first = first;
3526 con_driver->last = last;
3527 retval = 0;
3528 break;
3529 }
3530 }
3531
3532 if (retval)
3533 goto err;
3534
3535 con_driver->dev = device_create(vtconsole_class, NULL,
3536 MKDEV(0, con_driver->node),
3537 NULL, "vtcon%i",
3538 con_driver->node);
3539
3540 if (IS_ERR(con_driver->dev)) {
3541 printk(KERN_WARNING "Unable to create device for %s; "
3542 "errno = %ld\n", con_driver->desc,
3543 PTR_ERR(con_driver->dev));
3544 con_driver->dev = NULL;
3545 } else {
3546 vtconsole_init_device(con_driver);
3547 }
3548
3549 err:
3550 module_put(owner);
3551 return retval;
3552 }
3553
3554
3555 /**
3556 * unregister_con_driver - unregister console driver from console layer
3557 * @csw: console driver
3558 *
3559 * DESCRIPTION: All drivers that registers to the console layer must
3560 * call this function upon exit, or if the console driver is in a state
3561 * where it won't be able to handle console services, such as the
3562 * framebuffer console without loaded framebuffer drivers.
3563 *
3564 * The driver must unbind first prior to unregistration.
3565 */
3566 int unregister_con_driver(const struct consw *csw)
3567 {
3568 int retval;
3569
3570 console_lock();
3571 retval = do_unregister_con_driver(csw);
3572 console_unlock();
3573 return retval;
3574 }
3575 EXPORT_SYMBOL(unregister_con_driver);
3576
3577 int do_unregister_con_driver(const struct consw *csw)
3578 {
3579 int i, retval = -ENODEV;
3580
3581 /* cannot unregister a bound driver */
3582 if (con_is_bound(csw))
3583 goto err;
3584
3585 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3586 struct con_driver *con_driver = &registered_con_driver[i];
3587
3588 if (con_driver->con == csw &&
3589 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3590 vtconsole_deinit_device(con_driver);
3591 device_destroy(vtconsole_class,
3592 MKDEV(0, con_driver->node));
3593 con_driver->con = NULL;
3594 con_driver->desc = NULL;
3595 con_driver->dev = NULL;
3596 con_driver->node = 0;
3597 con_driver->flag = 0;
3598 con_driver->first = 0;
3599 con_driver->last = 0;
3600 retval = 0;
3601 break;
3602 }
3603 }
3604 err:
3605 return retval;
3606 }
3607 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3608
3609 /*
3610 * If we support more console drivers, this function is used
3611 * when a driver wants to take over some existing consoles
3612 * and become default driver for newly opened ones.
3613 *
3614 * take_over_console is basically a register followed by unbind
3615 */
3616 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3617 {
3618 int err;
3619
3620 err = do_register_con_driver(csw, first, last);
3621 /*
3622 * If we get an busy error we still want to bind the console driver
3623 * and return success, as we may have unbound the console driver
3624 * but not unregistered it.
3625 */
3626 if (err == -EBUSY)
3627 err = 0;
3628 if (!err)
3629 do_bind_con_driver(csw, first, last, deflt);
3630
3631 return err;
3632 }
3633 EXPORT_SYMBOL_GPL(do_take_over_console);
3634
3635
3636 /*
3637 * give_up_console is a wrapper to unregister_con_driver. It will only
3638 * work if driver is fully unbound.
3639 */
3640 void give_up_console(const struct consw *csw)
3641 {
3642 unregister_con_driver(csw);
3643 }
3644
3645 static int __init vtconsole_class_init(void)
3646 {
3647 int i;
3648
3649 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3650 if (IS_ERR(vtconsole_class)) {
3651 printk(KERN_WARNING "Unable to create vt console class; "
3652 "errno = %ld\n", PTR_ERR(vtconsole_class));
3653 vtconsole_class = NULL;
3654 }
3655
3656 /* Add system drivers to sysfs */
3657 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3658 struct con_driver *con = &registered_con_driver[i];
3659
3660 if (con->con && !con->dev) {
3661 con->dev = device_create(vtconsole_class, NULL,
3662 MKDEV(0, con->node),
3663 NULL, "vtcon%i",
3664 con->node);
3665
3666 if (IS_ERR(con->dev)) {
3667 printk(KERN_WARNING "Unable to create "
3668 "device for %s; errno = %ld\n",
3669 con->desc, PTR_ERR(con->dev));
3670 con->dev = NULL;
3671 } else {
3672 vtconsole_init_device(con);
3673 }
3674 }
3675 }
3676
3677 return 0;
3678 }
3679 postcore_initcall(vtconsole_class_init);
3680
3681 #endif
3682
3683 /*
3684 * Screen blanking
3685 */
3686
3687 static int set_vesa_blanking(char __user *p)
3688 {
3689 unsigned int mode;
3690
3691 if (get_user(mode, p + 1))
3692 return -EFAULT;
3693
3694 vesa_blank_mode = (mode < 4) ? mode : 0;
3695 return 0;
3696 }
3697
3698 void do_blank_screen(int entering_gfx)
3699 {
3700 struct vc_data *vc = vc_cons[fg_console].d;
3701 int i;
3702
3703 WARN_CONSOLE_UNLOCKED();
3704
3705 if (console_blanked) {
3706 if (blank_state == blank_vesa_wait) {
3707 blank_state = blank_off;
3708 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3709 }
3710 return;
3711 }
3712
3713 /* entering graphics mode? */
3714 if (entering_gfx) {
3715 hide_cursor(vc);
3716 save_screen(vc);
3717 vc->vc_sw->con_blank(vc, -1, 1);
3718 console_blanked = fg_console + 1;
3719 blank_state = blank_off;
3720 set_origin(vc);
3721 return;
3722 }
3723
3724 if (blank_state != blank_normal_wait)
3725 return;
3726 blank_state = blank_off;
3727
3728 /* don't blank graphics */
3729 if (vc->vc_mode != KD_TEXT) {
3730 console_blanked = fg_console + 1;
3731 return;
3732 }
3733
3734 hide_cursor(vc);
3735 del_timer_sync(&console_timer);
3736 blank_timer_expired = 0;
3737
3738 save_screen(vc);
3739 /* In case we need to reset origin, blanking hook returns 1 */
3740 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3741 console_blanked = fg_console + 1;
3742 if (i)
3743 set_origin(vc);
3744
3745 if (console_blank_hook && console_blank_hook(1))
3746 return;
3747
3748 if (vesa_off_interval && vesa_blank_mode) {
3749 blank_state = blank_vesa_wait;
3750 mod_timer(&console_timer, jiffies + vesa_off_interval);
3751 }
3752 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3753 }
3754 EXPORT_SYMBOL(do_blank_screen);
3755
3756 /*
3757 * Called by timer as well as from vt_console_driver
3758 */
3759 void do_unblank_screen(int leaving_gfx)
3760 {
3761 struct vc_data *vc;
3762
3763 /* This should now always be called from a "sane" (read: can schedule)
3764 * context for the sake of the low level drivers, except in the special
3765 * case of oops_in_progress
3766 */
3767 if (!oops_in_progress)
3768 might_sleep();
3769
3770 WARN_CONSOLE_UNLOCKED();
3771
3772 ignore_poke = 0;
3773 if (!console_blanked)
3774 return;
3775 if (!vc_cons_allocated(fg_console)) {
3776 /* impossible */
3777 pr_warning("unblank_screen: tty %d not allocated ??\n",
3778 fg_console+1);
3779 return;
3780 }
3781 vc = vc_cons[fg_console].d;
3782 /* Try to unblank in oops case too */
3783 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3784 return; /* but leave console_blanked != 0 */
3785
3786 if (blankinterval) {
3787 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3788 blank_state = blank_normal_wait;
3789 }
3790
3791 console_blanked = 0;
3792 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3793 /* Low-level driver cannot restore -> do it ourselves */
3794 update_screen(vc);
3795 if (console_blank_hook)
3796 console_blank_hook(0);
3797 set_palette(vc);
3798 set_cursor(vc);
3799 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3800 }
3801 EXPORT_SYMBOL(do_unblank_screen);
3802
3803 /*
3804 * This is called by the outside world to cause a forced unblank, mostly for
3805 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3806 * call it with 1 as an argument and so force a mode restore... that may kill
3807 * X or at least garbage the screen but would also make the Oops visible...
3808 */
3809 void unblank_screen(void)
3810 {
3811 do_unblank_screen(0);
3812 }
3813
3814 /*
3815 * We defer the timer blanking to work queue so it can take the console mutex
3816 * (console operations can still happen at irq time, but only from printk which
3817 * has the console mutex. Not perfect yet, but better than no locking
3818 */
3819 static void blank_screen_t(unsigned long dummy)
3820 {
3821 if (unlikely(!keventd_up())) {
3822 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3823 return;
3824 }
3825 blank_timer_expired = 1;
3826 schedule_work(&console_work);
3827 }
3828
3829 void poke_blanked_console(void)
3830 {
3831 WARN_CONSOLE_UNLOCKED();
3832
3833 /* Add this so we quickly catch whoever might call us in a non
3834 * safe context. Nowadays, unblank_screen() isn't to be called in
3835 * atomic contexts and is allowed to schedule (with the special case
3836 * of oops_in_progress, but that isn't of any concern for this
3837 * function. --BenH.
3838 */
3839 might_sleep();
3840
3841 /* This isn't perfectly race free, but a race here would be mostly harmless,
3842 * at worse, we'll do a spurrious blank and it's unlikely
3843 */
3844 del_timer(&console_timer);
3845 blank_timer_expired = 0;
3846
3847 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3848 return;
3849 if (console_blanked)
3850 unblank_screen();
3851 else if (blankinterval) {
3852 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3853 blank_state = blank_normal_wait;
3854 }
3855 }
3856
3857 /*
3858 * Palettes
3859 */
3860
3861 static void set_palette(struct vc_data *vc)
3862 {
3863 WARN_CONSOLE_UNLOCKED();
3864
3865 if (vc->vc_mode != KD_GRAPHICS)
3866 vc->vc_sw->con_set_palette(vc, color_table);
3867 }
3868
3869 /*
3870 * Load palette into the DAC registers. arg points to a colour
3871 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3872 */
3873
3874 int con_set_cmap(unsigned char __user *arg)
3875 {
3876 int i, j, k;
3877 unsigned char colormap[3*16];
3878
3879 if (copy_from_user(colormap, arg, sizeof(colormap)))
3880 return -EFAULT;
3881
3882 console_lock();
3883 for (i = k = 0; i < 16; i++) {
3884 default_red[i] = colormap[k++];
3885 default_grn[i] = colormap[k++];
3886 default_blu[i] = colormap[k++];
3887 }
3888 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3889 if (!vc_cons_allocated(i))
3890 continue;
3891 for (j = k = 0; j < 16; j++) {
3892 vc_cons[i].d->vc_palette[k++] = default_red[j];
3893 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3894 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3895 }
3896 set_palette(vc_cons[i].d);
3897 }
3898 console_unlock();
3899
3900 return 0;
3901 }
3902
3903 int con_get_cmap(unsigned char __user *arg)
3904 {
3905 int i, k;
3906 unsigned char colormap[3*16];
3907
3908 console_lock();
3909 for (i = k = 0; i < 16; i++) {
3910 colormap[k++] = default_red[i];
3911 colormap[k++] = default_grn[i];
3912 colormap[k++] = default_blu[i];
3913 }
3914 console_unlock();
3915
3916 if (copy_to_user(arg, colormap, sizeof(colormap)))
3917 return -EFAULT;
3918
3919 return 0;
3920 }
3921
3922 void reset_palette(struct vc_data *vc)
3923 {
3924 int j, k;
3925 for (j=k=0; j<16; j++) {
3926 vc->vc_palette[k++] = default_red[j];
3927 vc->vc_palette[k++] = default_grn[j];
3928 vc->vc_palette[k++] = default_blu[j];
3929 }
3930 set_palette(vc);
3931 }
3932
3933 /*
3934 * Font switching
3935 *
3936 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3937 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3938 * depending on width) reserved for each character which is kinda wasty, but
3939 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3940 * is up to the actual low-level console-driver convert data into its favorite
3941 * format (maybe we should add a `fontoffset' field to the `display'
3942 * structure so we won't have to convert the fontdata all the time.
3943 * /Jes
3944 */
3945
3946 #define max_font_size 65536
3947
3948 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3949 {
3950 struct console_font font;
3951 int rc = -EINVAL;
3952 int c;
3953
3954 if (op->data) {
3955 font.data = kmalloc(max_font_size, GFP_KERNEL);
3956 if (!font.data)
3957 return -ENOMEM;
3958 } else
3959 font.data = NULL;
3960
3961 console_lock();
3962 if (vc->vc_mode != KD_TEXT)
3963 rc = -EINVAL;
3964 else if (vc->vc_sw->con_font_get)
3965 rc = vc->vc_sw->con_font_get(vc, &font);
3966 else
3967 rc = -ENOSYS;
3968 console_unlock();
3969
3970 if (rc)
3971 goto out;
3972
3973 c = (font.width+7)/8 * 32 * font.charcount;
3974
3975 if (op->data && font.charcount > op->charcount)
3976 rc = -ENOSPC;
3977 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3978 if (font.width > op->width || font.height > op->height)
3979 rc = -ENOSPC;
3980 } else {
3981 if (font.width != 8)
3982 rc = -EIO;
3983 else if ((op->height && font.height > op->height) ||
3984 font.height > 32)
3985 rc = -ENOSPC;
3986 }
3987 if (rc)
3988 goto out;
3989
3990 op->height = font.height;
3991 op->width = font.width;
3992 op->charcount = font.charcount;
3993
3994 if (op->data && copy_to_user(op->data, font.data, c))
3995 rc = -EFAULT;
3996
3997 out:
3998 kfree(font.data);
3999 return rc;
4000 }
4001
4002 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4003 {
4004 struct console_font font;
4005 int rc = -EINVAL;
4006 int size;
4007
4008 if (vc->vc_mode != KD_TEXT)
4009 return -EINVAL;
4010 if (!op->data)
4011 return -EINVAL;
4012 if (op->charcount > 512)
4013 return -EINVAL;
4014 if (!op->height) { /* Need to guess font height [compat] */
4015 int h, i;
4016 u8 __user *charmap = op->data;
4017 u8 tmp;
4018
4019 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4020 so that we can get rid of this soon */
4021 if (!(op->flags & KD_FONT_FLAG_OLD))
4022 return -EINVAL;
4023 for (h = 32; h > 0; h--)
4024 for (i = 0; i < op->charcount; i++) {
4025 if (get_user(tmp, &charmap[32*i+h-1]))
4026 return -EFAULT;
4027 if (tmp)
4028 goto nonzero;
4029 }
4030 return -EINVAL;
4031 nonzero:
4032 op->height = h;
4033 }
4034 if (op->width <= 0 || op->width > 32 || op->height > 32)
4035 return -EINVAL;
4036 size = (op->width+7)/8 * 32 * op->charcount;
4037 if (size > max_font_size)
4038 return -ENOSPC;
4039 font.charcount = op->charcount;
4040 font.height = op->height;
4041 font.width = op->width;
4042 font.data = memdup_user(op->data, size);
4043 if (IS_ERR(font.data))
4044 return PTR_ERR(font.data);
4045 console_lock();
4046 if (vc->vc_mode != KD_TEXT)
4047 rc = -EINVAL;
4048 else if (vc->vc_sw->con_font_set)
4049 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4050 else
4051 rc = -ENOSYS;
4052 console_unlock();
4053 kfree(font.data);
4054 return rc;
4055 }
4056
4057 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4058 {
4059 struct console_font font = {.width = op->width, .height = op->height};
4060 char name[MAX_FONT_NAME];
4061 char *s = name;
4062 int rc;
4063
4064
4065 if (!op->data)
4066 s = NULL;
4067 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4068 return -EFAULT;
4069 else
4070 name[MAX_FONT_NAME - 1] = 0;
4071
4072 console_lock();
4073 if (vc->vc_mode != KD_TEXT) {
4074 console_unlock();
4075 return -EINVAL;
4076 }
4077 if (vc->vc_sw->con_font_default)
4078 rc = vc->vc_sw->con_font_default(vc, &font, s);
4079 else
4080 rc = -ENOSYS;
4081 console_unlock();
4082 if (!rc) {
4083 op->width = font.width;
4084 op->height = font.height;
4085 }
4086 return rc;
4087 }
4088
4089 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4090 {
4091 int con = op->height;
4092 int rc;
4093
4094
4095 console_lock();
4096 if (vc->vc_mode != KD_TEXT)
4097 rc = -EINVAL;
4098 else if (!vc->vc_sw->con_font_copy)
4099 rc = -ENOSYS;
4100 else if (con < 0 || !vc_cons_allocated(con))
4101 rc = -ENOTTY;
4102 else if (con == vc->vc_num) /* nothing to do */
4103 rc = 0;
4104 else
4105 rc = vc->vc_sw->con_font_copy(vc, con);
4106 console_unlock();
4107 return rc;
4108 }
4109
4110 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4111 {
4112 switch (op->op) {
4113 case KD_FONT_OP_SET:
4114 return con_font_set(vc, op);
4115 case KD_FONT_OP_GET:
4116 return con_font_get(vc, op);
4117 case KD_FONT_OP_SET_DEFAULT:
4118 return con_font_default(vc, op);
4119 case KD_FONT_OP_COPY:
4120 return con_font_copy(vc, op);
4121 }
4122 return -ENOSYS;
4123 }
4124
4125 /*
4126 * Interface exported to selection and vcs.
4127 */
4128
4129 /* used by selection */
4130 u16 screen_glyph(struct vc_data *vc, int offset)
4131 {
4132 u16 w = scr_readw(screenpos(vc, offset, 1));
4133 u16 c = w & 0xff;
4134
4135 if (w & vc->vc_hi_font_mask)
4136 c |= 0x100;
4137 return c;
4138 }
4139 EXPORT_SYMBOL_GPL(screen_glyph);
4140
4141 /* used by vcs - note the word offset */
4142 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4143 {
4144 return screenpos(vc, 2 * w_offset, viewed);
4145 }
4146
4147 void getconsxy(struct vc_data *vc, unsigned char *p)
4148 {
4149 p[0] = vc->vc_x;
4150 p[1] = vc->vc_y;
4151 }
4152
4153 void putconsxy(struct vc_data *vc, unsigned char *p)
4154 {
4155 hide_cursor(vc);
4156 gotoxy(vc, p[0], p[1]);
4157 set_cursor(vc);
4158 }
4159
4160 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4161 {
4162 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4163 return softcursor_original;
4164 return scr_readw(org);
4165 }
4166
4167 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4168 {
4169 scr_writew(val, org);
4170 if ((unsigned long)org == vc->vc_pos) {
4171 softcursor_original = -1;
4172 add_softcursor(vc);
4173 }
4174 }
4175
4176 void vcs_scr_updated(struct vc_data *vc)
4177 {
4178 notify_update(vc);
4179 }
4180
4181 /*
4182 * Visible symbols for modules
4183 */
4184
4185 EXPORT_SYMBOL(color_table);
4186 EXPORT_SYMBOL(default_red);
4187 EXPORT_SYMBOL(default_grn);
4188 EXPORT_SYMBOL(default_blu);
4189 EXPORT_SYMBOL(update_region);
4190 EXPORT_SYMBOL(redraw_screen);
4191 EXPORT_SYMBOL(vc_resize);
4192 EXPORT_SYMBOL(fg_console);
4193 EXPORT_SYMBOL(console_blank_hook);
4194 EXPORT_SYMBOL(console_blanked);
4195 EXPORT_SYMBOL(vc_cons);
4196 EXPORT_SYMBOL(global_cursor_default);
4197 #ifndef VT_SINGLE_DRIVER
4198 EXPORT_SYMBOL(give_up_console);
4199 #endif
Linux kernel - Deliverables
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