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kobject: sanitize argument for format string
[linux-2.6.git] / drivers / tty / vt / vt.c
blob740202d8a5c4b732ab9c98b188c995d3a0f78587
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 kfree(vc);
783 vc_cons[currcons].d = NULL;
784 return -ENOMEM;
785 }
786
787 /* If no drivers have overridden us and the user didn't pass a
788 boot option, default to displaying the cursor */
789 if (global_cursor_default == -1)
790 global_cursor_default = 1;
791
792 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
793 vcs_make_sysfs(currcons);
794 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
795 }
796 return 0;
797 }
798
799 static inline int resize_screen(struct vc_data *vc, int width, int height,
800 int user)
801 {
802 /* Resizes the resolution of the display adapater */
803 int err = 0;
804
805 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
806 err = vc->vc_sw->con_resize(vc, width, height, user);
807
808 return err;
809 }
810
811 /*
812 * Change # of rows and columns (0 means unchanged/the size of fg_console)
813 * [this is to be used together with some user program
814 * like resize that changes the hardware videomode]
815 */
816 #define VC_RESIZE_MAXCOL (32767)
817 #define VC_RESIZE_MAXROW (32767)
818
819 /**
820 * vc_do_resize - resizing method for the tty
821 * @tty: tty being resized
822 * @real_tty: real tty (different to tty if a pty/tty pair)
823 * @vc: virtual console private data
824 * @cols: columns
825 * @lines: lines
826 *
827 * Resize a virtual console, clipping according to the actual constraints.
828 * If the caller passes a tty structure then update the termios winsize
829 * information and perform any necessary signal handling.
830 *
831 * Caller must hold the console semaphore. Takes the termios mutex and
832 * ctrl_lock of the tty IFF a tty is passed.
833 */
834
835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
836 unsigned int cols, unsigned int lines)
837 {
838 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
839 unsigned long end;
840 unsigned int old_rows, old_row_size;
841 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
842 unsigned int user;
843 unsigned short *newscreen;
844
845 WARN_CONSOLE_UNLOCKED();
846
847 if (!vc)
848 return -ENXIO;
849
850 user = vc->vc_resize_user;
851 vc->vc_resize_user = 0;
852
853 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
854 return -EINVAL;
855
856 new_cols = (cols ? cols : vc->vc_cols);
857 new_rows = (lines ? lines : vc->vc_rows);
858 new_row_size = new_cols << 1;
859 new_screen_size = new_row_size * new_rows;
860
861 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
862 return 0;
863
864 newscreen = kmalloc(new_screen_size, GFP_USER);
865 if (!newscreen)
866 return -ENOMEM;
867
868 old_rows = vc->vc_rows;
869 old_row_size = vc->vc_size_row;
870
871 err = resize_screen(vc, new_cols, new_rows, user);
872 if (err) {
873 kfree(newscreen);
874 return err;
875 }
876
877 vc->vc_rows = new_rows;
878 vc->vc_cols = new_cols;
879 vc->vc_size_row = new_row_size;
880 vc->vc_screenbuf_size = new_screen_size;
881
882 rlth = min(old_row_size, new_row_size);
883 rrem = new_row_size - rlth;
884 old_origin = vc->vc_origin;
885 new_origin = (long) newscreen;
886 new_scr_end = new_origin + new_screen_size;
887
888 if (vc->vc_y > new_rows) {
889 if (old_rows - vc->vc_y < new_rows) {
890 /*
891 * Cursor near the bottom, copy contents from the
892 * bottom of buffer
893 */
894 old_origin += (old_rows - new_rows) * old_row_size;
895 } else {
896 /*
897 * Cursor is in no man's land, copy 1/2 screenful
898 * from the top and bottom of cursor position
899 */
900 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
901 }
902 }
903
904 end = old_origin + old_row_size * min(old_rows, new_rows);
905
906 update_attr(vc);
907
908 while (old_origin < end) {
909 scr_memcpyw((unsigned short *) new_origin,
910 (unsigned short *) old_origin, rlth);
911 if (rrem)
912 scr_memsetw((void *)(new_origin + rlth),
913 vc->vc_video_erase_char, rrem);
914 old_origin += old_row_size;
915 new_origin += new_row_size;
916 }
917 if (new_scr_end > new_origin)
918 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
919 new_scr_end - new_origin);
920 kfree(vc->vc_screenbuf);
921 vc->vc_screenbuf = newscreen;
922 vc->vc_screenbuf_size = new_screen_size;
923 set_origin(vc);
924
925 /* do part of a reset_terminal() */
926 vc->vc_top = 0;
927 vc->vc_bottom = vc->vc_rows;
928 gotoxy(vc, vc->vc_x, vc->vc_y);
929 save_cur(vc);
930
931 if (tty) {
932 /* Rewrite the requested winsize data with the actual
933 resulting sizes */
934 struct winsize ws;
935 memset(&ws, 0, sizeof(ws));
936 ws.ws_row = vc->vc_rows;
937 ws.ws_col = vc->vc_cols;
938 ws.ws_ypixel = vc->vc_scan_lines;
939 tty_do_resize(tty, &ws);
940 }
941
942 if (CON_IS_VISIBLE(vc))
943 update_screen(vc);
944 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
945 return err;
946 }
947
948 /**
949 * vc_resize - resize a VT
950 * @vc: virtual console
951 * @cols: columns
952 * @rows: rows
953 *
954 * Resize a virtual console as seen from the console end of things. We
955 * use the common vc_do_resize methods to update the structures. The
956 * caller must hold the console sem to protect console internals and
957 * vc->port.tty
958 */
959
960 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
961 {
962 return vc_do_resize(vc->port.tty, vc, cols, rows);
963 }
964
965 /**
966 * vt_resize - resize a VT
967 * @tty: tty to resize
968 * @ws: winsize attributes
969 *
970 * Resize a virtual terminal. This is called by the tty layer as we
971 * register our own handler for resizing. The mutual helper does all
972 * the actual work.
973 *
974 * Takes the console sem and the called methods then take the tty
975 * termios_mutex and the tty ctrl_lock in that order.
976 */
977 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
978 {
979 struct vc_data *vc = tty->driver_data;
980 int ret;
981
982 console_lock();
983 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
984 console_unlock();
985 return ret;
986 }
987
988 struct vc_data *vc_deallocate(unsigned int currcons)
989 {
990 struct vc_data *vc = NULL;
991
992 WARN_CONSOLE_UNLOCKED();
993
994 if (vc_cons_allocated(currcons)) {
995 struct vt_notifier_param param;
996
997 param.vc = vc = vc_cons[currcons].d;
998 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
999 vcs_remove_sysfs(currcons);
1000 vc->vc_sw->con_deinit(vc);
1001 put_pid(vc->vt_pid);
1002 module_put(vc->vc_sw->owner);
1003 kfree(vc->vc_screenbuf);
1004 vc_cons[currcons].d = NULL;
1005 }
1006 return vc;
1007 }
1008
1009 /*
1010 * VT102 emulator
1011 */
1012
1013 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1014 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1015 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1016
1017 #define decarm VC_REPEAT
1018 #define decckm VC_CKMODE
1019 #define kbdapplic VC_APPLIC
1020 #define lnm VC_CRLF
1021
1022 /*
1023 * this is what the terminal answers to a ESC-Z or csi0c query.
1024 */
1025 #define VT100ID "\033[?1;2c"
1026 #define VT102ID "\033[?6c"
1027
1028 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1029 8,12,10,14, 9,13,11,15 };
1030
1031 /* the default colour table, for VGA+ colour systems */
1032 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1033 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1034 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1035 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1036 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1037 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1038
1039 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042
1043 /*
1044 * gotoxy() must verify all boundaries, because the arguments
1045 * might also be negative. If the given position is out of
1046 * bounds, the cursor is placed at the nearest margin.
1047 */
1048 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1049 {
1050 int min_y, max_y;
1051
1052 if (new_x < 0)
1053 vc->vc_x = 0;
1054 else {
1055 if (new_x >= vc->vc_cols)
1056 vc->vc_x = vc->vc_cols - 1;
1057 else
1058 vc->vc_x = new_x;
1059 }
1060
1061 if (vc->vc_decom) {
1062 min_y = vc->vc_top;
1063 max_y = vc->vc_bottom;
1064 } else {
1065 min_y = 0;
1066 max_y = vc->vc_rows;
1067 }
1068 if (new_y < min_y)
1069 vc->vc_y = min_y;
1070 else if (new_y >= max_y)
1071 vc->vc_y = max_y - 1;
1072 else
1073 vc->vc_y = new_y;
1074 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1075 vc->vc_need_wrap = 0;
1076 }
1077
1078 /* for absolute user moves, when decom is set */
1079 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1080 {
1081 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082 }
1083
1084 void scrollback(struct vc_data *vc, int lines)
1085 {
1086 if (!lines)
1087 lines = vc->vc_rows / 2;
1088 scrolldelta(-lines);
1089 }
1090
1091 void scrollfront(struct vc_data *vc, int lines)
1092 {
1093 if (!lines)
1094 lines = vc->vc_rows / 2;
1095 scrolldelta(lines);
1096 }
1097
1098 static void lf(struct vc_data *vc)
1099 {
1100 /* don't scroll if above bottom of scrolling region, or
1101 * if below scrolling region
1102 */
1103 if (vc->vc_y + 1 == vc->vc_bottom)
1104 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1105 else if (vc->vc_y < vc->vc_rows - 1) {
1106 vc->vc_y++;
1107 vc->vc_pos += vc->vc_size_row;
1108 }
1109 vc->vc_need_wrap = 0;
1110 notify_write(vc, '\n');
1111 }
1112
1113 static void ri(struct vc_data *vc)
1114 {
1115 /* don't scroll if below top of scrolling region, or
1116 * if above scrolling region
1117 */
1118 if (vc->vc_y == vc->vc_top)
1119 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1120 else if (vc->vc_y > 0) {
1121 vc->vc_y--;
1122 vc->vc_pos -= vc->vc_size_row;
1123 }
1124 vc->vc_need_wrap = 0;
1125 }
1126
1127 static inline void cr(struct vc_data *vc)
1128 {
1129 vc->vc_pos -= vc->vc_x << 1;
1130 vc->vc_need_wrap = vc->vc_x = 0;
1131 notify_write(vc, '\r');
1132 }
1133
1134 static inline void bs(struct vc_data *vc)
1135 {
1136 if (vc->vc_x) {
1137 vc->vc_pos -= 2;
1138 vc->vc_x--;
1139 vc->vc_need_wrap = 0;
1140 notify_write(vc, '\b');
1141 }
1142 }
1143
1144 static inline void del(struct vc_data *vc)
1145 {
1146 /* ignored */
1147 }
1148
1149 static void csi_J(struct vc_data *vc, int vpar)
1150 {
1151 unsigned int count;
1152 unsigned short * start;
1153
1154 switch (vpar) {
1155 case 0: /* erase from cursor to end of display */
1156 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1157 start = (unsigned short *)vc->vc_pos;
1158 break;
1159 case 1: /* erase from start to cursor */
1160 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161 start = (unsigned short *)vc->vc_origin;
1162 break;
1163 case 3: /* erase scroll-back buffer (and whole display) */
1164 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1165 vc->vc_screenbuf_size >> 1);
1166 set_origin(vc);
1167 /* fall through */
1168 case 2: /* erase whole display */
1169 count = vc->vc_cols * vc->vc_rows;
1170 start = (unsigned short *)vc->vc_origin;
1171 break;
1172 default:
1173 return;
1174 }
1175 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1176 if (DO_UPDATE(vc))
1177 do_update_region(vc, (unsigned long) start, count);
1178 vc->vc_need_wrap = 0;
1179 }
1180
1181 static void csi_K(struct vc_data *vc, int vpar)
1182 {
1183 unsigned int count;
1184 unsigned short * start;
1185
1186 switch (vpar) {
1187 case 0: /* erase from cursor to end of line */
1188 count = vc->vc_cols - vc->vc_x;
1189 start = (unsigned short *)vc->vc_pos;
1190 break;
1191 case 1: /* erase from start of line to cursor */
1192 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1193 count = vc->vc_x + 1;
1194 break;
1195 case 2: /* erase whole line */
1196 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1197 count = vc->vc_cols;
1198 break;
1199 default:
1200 return;
1201 }
1202 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1203 vc->vc_need_wrap = 0;
1204 if (DO_UPDATE(vc))
1205 do_update_region(vc, (unsigned long) start, count);
1206 }
1207
1208 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1209 { /* not vt100? */
1210 int count;
1211
1212 if (!vpar)
1213 vpar++;
1214 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1215
1216 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1217 if (DO_UPDATE(vc))
1218 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1219 vc->vc_need_wrap = 0;
1220 }
1221
1222 static void default_attr(struct vc_data *vc)
1223 {
1224 vc->vc_intensity = 1;
1225 vc->vc_italic = 0;
1226 vc->vc_underline = 0;
1227 vc->vc_reverse = 0;
1228 vc->vc_blink = 0;
1229 vc->vc_color = vc->vc_def_color;
1230 }
1231
1232 /* console_lock is held */
1233 static void csi_m(struct vc_data *vc)
1234 {
1235 int i;
1236
1237 for (i = 0; i <= vc->vc_npar; i++)
1238 switch (vc->vc_par[i]) {
1239 case 0: /* all attributes off */
1240 default_attr(vc);
1241 break;
1242 case 1:
1243 vc->vc_intensity = 2;
1244 break;
1245 case 2:
1246 vc->vc_intensity = 0;
1247 break;
1248 case 3:
1249 vc->vc_italic = 1;
1250 break;
1251 case 4:
1252 vc->vc_underline = 1;
1253 break;
1254 case 5:
1255 vc->vc_blink = 1;
1256 break;
1257 case 7:
1258 vc->vc_reverse = 1;
1259 break;
1260 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1261 * Select primary font, don't display
1262 * control chars if defined, don't set
1263 * bit 8 on output.
1264 */
1265 vc->vc_translate = set_translate(vc->vc_charset == 0
1266 ? vc->vc_G0_charset
1267 : vc->vc_G1_charset, vc);
1268 vc->vc_disp_ctrl = 0;
1269 vc->vc_toggle_meta = 0;
1270 break;
1271 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1272 * Select first alternate font, lets
1273 * chars < 32 be displayed as ROM chars.
1274 */
1275 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1276 vc->vc_disp_ctrl = 1;
1277 vc->vc_toggle_meta = 0;
1278 break;
1279 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1280 * Select second alternate font, toggle
1281 * high bit before displaying as ROM char.
1282 */
1283 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1284 vc->vc_disp_ctrl = 1;
1285 vc->vc_toggle_meta = 1;
1286 break;
1287 case 21:
1288 case 22:
1289 vc->vc_intensity = 1;
1290 break;
1291 case 23:
1292 vc->vc_italic = 0;
1293 break;
1294 case 24:
1295 vc->vc_underline = 0;
1296 break;
1297 case 25:
1298 vc->vc_blink = 0;
1299 break;
1300 case 27:
1301 vc->vc_reverse = 0;
1302 break;
1303 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1304 * Enables underscore, white foreground
1305 * with white underscore (Linux - use
1306 * default foreground).
1307 */
1308 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1309 vc->vc_underline = 1;
1310 break;
1311 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1312 * Disable underline option.
1313 * Reset colour to default? It did this
1314 * before...
1315 */
1316 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1317 vc->vc_underline = 0;
1318 break;
1319 case 49:
1320 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1321 break;
1322 default:
1323 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1324 vc->vc_color = color_table[vc->vc_par[i] - 30]
1325 | (vc->vc_color & 0xf0);
1326 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1327 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1328 | (vc->vc_color & 0x0f);
1329 break;
1330 }
1331 update_attr(vc);
1332 }
1333
1334 static void respond_string(const char *p, struct tty_port *port)
1335 {
1336 while (*p) {
1337 tty_insert_flip_char(port, *p, 0);
1338 p++;
1339 }
1340 tty_schedule_flip(port);
1341 }
1342
1343 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1344 {
1345 char buf[40];
1346
1347 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1348 respond_string(buf, tty->port);
1349 }
1350
1351 static inline void status_report(struct tty_struct *tty)
1352 {
1353 respond_string("\033[0n", tty->port); /* Terminal ok */
1354 }
1355
1356 static inline void respond_ID(struct tty_struct *tty)
1357 {
1358 respond_string(VT102ID, tty->port);
1359 }
1360
1361 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1362 {
1363 char buf[8];
1364
1365 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1366 (char)('!' + mry));
1367 respond_string(buf, tty->port);
1368 }
1369
1370 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1371 int mouse_reporting(void)
1372 {
1373 return vc_cons[fg_console].d->vc_report_mouse;
1374 }
1375
1376 /* console_lock is held */
1377 static void set_mode(struct vc_data *vc, int on_off)
1378 {
1379 int i;
1380
1381 for (i = 0; i <= vc->vc_npar; i++)
1382 if (vc->vc_ques) {
1383 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1384 case 1: /* Cursor keys send ^[Ox/^[[x */
1385 if (on_off)
1386 set_kbd(vc, decckm);
1387 else
1388 clr_kbd(vc, decckm);
1389 break;
1390 case 3: /* 80/132 mode switch unimplemented */
1391 vc->vc_deccolm = on_off;
1392 #if 0
1393 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1394 /* this alone does not suffice; some user mode
1395 utility has to change the hardware regs */
1396 #endif
1397 break;
1398 case 5: /* Inverted screen on/off */
1399 if (vc->vc_decscnm != on_off) {
1400 vc->vc_decscnm = on_off;
1401 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1402 update_attr(vc);
1403 }
1404 break;
1405 case 6: /* Origin relative/absolute */
1406 vc->vc_decom = on_off;
1407 gotoxay(vc, 0, 0);
1408 break;
1409 case 7: /* Autowrap on/off */
1410 vc->vc_decawm = on_off;
1411 break;
1412 case 8: /* Autorepeat on/off */
1413 if (on_off)
1414 set_kbd(vc, decarm);
1415 else
1416 clr_kbd(vc, decarm);
1417 break;
1418 case 9:
1419 vc->vc_report_mouse = on_off ? 1 : 0;
1420 break;
1421 case 25: /* Cursor on/off */
1422 vc->vc_deccm = on_off;
1423 break;
1424 case 1000:
1425 vc->vc_report_mouse = on_off ? 2 : 0;
1426 break;
1427 }
1428 } else {
1429 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1430 case 3: /* Monitor (display ctrls) */
1431 vc->vc_disp_ctrl = on_off;
1432 break;
1433 case 4: /* Insert Mode on/off */
1434 vc->vc_decim = on_off;
1435 break;
1436 case 20: /* Lf, Enter == CrLf/Lf */
1437 if (on_off)
1438 set_kbd(vc, lnm);
1439 else
1440 clr_kbd(vc, lnm);
1441 break;
1442 }
1443 }
1444 }
1445
1446 /* console_lock is held */
1447 static void setterm_command(struct vc_data *vc)
1448 {
1449 switch(vc->vc_par[0]) {
1450 case 1: /* set color for underline mode */
1451 if (vc->vc_can_do_color &&
1452 vc->vc_par[1] < 16) {
1453 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1454 if (vc->vc_underline)
1455 update_attr(vc);
1456 }
1457 break;
1458 case 2: /* set color for half intensity mode */
1459 if (vc->vc_can_do_color &&
1460 vc->vc_par[1] < 16) {
1461 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1462 if (vc->vc_intensity == 0)
1463 update_attr(vc);
1464 }
1465 break;
1466 case 8: /* store colors as defaults */
1467 vc->vc_def_color = vc->vc_attr;
1468 if (vc->vc_hi_font_mask == 0x100)
1469 vc->vc_def_color >>= 1;
1470 default_attr(vc);
1471 update_attr(vc);
1472 break;
1473 case 9: /* set blanking interval */
1474 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1475 poke_blanked_console();
1476 break;
1477 case 10: /* set bell frequency in Hz */
1478 if (vc->vc_npar >= 1)
1479 vc->vc_bell_pitch = vc->vc_par[1];
1480 else
1481 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1482 break;
1483 case 11: /* set bell duration in msec */
1484 if (vc->vc_npar >= 1)
1485 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1486 vc->vc_par[1] * HZ / 1000 : 0;
1487 else
1488 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1489 break;
1490 case 12: /* bring specified console to the front */
1491 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1492 set_console(vc->vc_par[1] - 1);
1493 break;
1494 case 13: /* unblank the screen */
1495 poke_blanked_console();
1496 break;
1497 case 14: /* set vesa powerdown interval */
1498 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1499 break;
1500 case 15: /* activate the previous console */
1501 set_console(last_console);
1502 break;
1503 }
1504 }
1505
1506 /* console_lock is held */
1507 static void csi_at(struct vc_data *vc, unsigned int nr)
1508 {
1509 if (nr > vc->vc_cols - vc->vc_x)
1510 nr = vc->vc_cols - vc->vc_x;
1511 else if (!nr)
1512 nr = 1;
1513 insert_char(vc, nr);
1514 }
1515
1516 /* console_lock is held */
1517 static void csi_L(struct vc_data *vc, unsigned int nr)
1518 {
1519 if (nr > vc->vc_rows - vc->vc_y)
1520 nr = vc->vc_rows - vc->vc_y;
1521 else if (!nr)
1522 nr = 1;
1523 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1524 vc->vc_need_wrap = 0;
1525 }
1526
1527 /* console_lock is held */
1528 static void csi_P(struct vc_data *vc, unsigned int nr)
1529 {
1530 if (nr > vc->vc_cols - vc->vc_x)
1531 nr = vc->vc_cols - vc->vc_x;
1532 else if (!nr)
1533 nr = 1;
1534 delete_char(vc, nr);
1535 }
1536
1537 /* console_lock is held */
1538 static void csi_M(struct vc_data *vc, unsigned int nr)
1539 {
1540 if (nr > vc->vc_rows - vc->vc_y)
1541 nr = vc->vc_rows - vc->vc_y;
1542 else if (!nr)
1543 nr=1;
1544 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1545 vc->vc_need_wrap = 0;
1546 }
1547
1548 /* console_lock is held (except via vc_init->reset_terminal */
1549 static void save_cur(struct vc_data *vc)
1550 {
1551 vc->vc_saved_x = vc->vc_x;
1552 vc->vc_saved_y = vc->vc_y;
1553 vc->vc_s_intensity = vc->vc_intensity;
1554 vc->vc_s_italic = vc->vc_italic;
1555 vc->vc_s_underline = vc->vc_underline;
1556 vc->vc_s_blink = vc->vc_blink;
1557 vc->vc_s_reverse = vc->vc_reverse;
1558 vc->vc_s_charset = vc->vc_charset;
1559 vc->vc_s_color = vc->vc_color;
1560 vc->vc_saved_G0 = vc->vc_G0_charset;
1561 vc->vc_saved_G1 = vc->vc_G1_charset;
1562 }
1563
1564 /* console_lock is held */
1565 static void restore_cur(struct vc_data *vc)
1566 {
1567 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1568 vc->vc_intensity = vc->vc_s_intensity;
1569 vc->vc_italic = vc->vc_s_italic;
1570 vc->vc_underline = vc->vc_s_underline;
1571 vc->vc_blink = vc->vc_s_blink;
1572 vc->vc_reverse = vc->vc_s_reverse;
1573 vc->vc_charset = vc->vc_s_charset;
1574 vc->vc_color = vc->vc_s_color;
1575 vc->vc_G0_charset = vc->vc_saved_G0;
1576 vc->vc_G1_charset = vc->vc_saved_G1;
1577 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1578 update_attr(vc);
1579 vc->vc_need_wrap = 0;
1580 }
1581
1582 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1583 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1584 ESpalette };
1585
1586 /* console_lock is held (except via vc_init()) */
1587 static void reset_terminal(struct vc_data *vc, int do_clear)
1588 {
1589 vc->vc_top = 0;
1590 vc->vc_bottom = vc->vc_rows;
1591 vc->vc_state = ESnormal;
1592 vc->vc_ques = 0;
1593 vc->vc_translate = set_translate(LAT1_MAP, vc);
1594 vc->vc_G0_charset = LAT1_MAP;
1595 vc->vc_G1_charset = GRAF_MAP;
1596 vc->vc_charset = 0;
1597 vc->vc_need_wrap = 0;
1598 vc->vc_report_mouse = 0;
1599 vc->vc_utf = default_utf8;
1600 vc->vc_utf_count = 0;
1601
1602 vc->vc_disp_ctrl = 0;
1603 vc->vc_toggle_meta = 0;
1604
1605 vc->vc_decscnm = 0;
1606 vc->vc_decom = 0;
1607 vc->vc_decawm = 1;
1608 vc->vc_deccm = global_cursor_default;
1609 vc->vc_decim = 0;
1610
1611 vt_reset_keyboard(vc->vc_num);
1612
1613 vc->vc_cursor_type = cur_default;
1614 vc->vc_complement_mask = vc->vc_s_complement_mask;
1615
1616 default_attr(vc);
1617 update_attr(vc);
1618
1619 vc->vc_tab_stop[0] = 0x01010100;
1620 vc->vc_tab_stop[1] =
1621 vc->vc_tab_stop[2] =
1622 vc->vc_tab_stop[3] =
1623 vc->vc_tab_stop[4] =
1624 vc->vc_tab_stop[5] =
1625 vc->vc_tab_stop[6] =
1626 vc->vc_tab_stop[7] = 0x01010101;
1627
1628 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1629 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1630
1631 gotoxy(vc, 0, 0);
1632 save_cur(vc);
1633 if (do_clear)
1634 csi_J(vc, 2);
1635 }
1636
1637 /* console_lock is held */
1638 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1639 {
1640 /*
1641 * Control characters can be used in the _middle_
1642 * of an escape sequence.
1643 */
1644 switch (c) {
1645 case 0:
1646 return;
1647 case 7:
1648 if (vc->vc_bell_duration)
1649 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1650 return;
1651 case 8:
1652 bs(vc);
1653 return;
1654 case 9:
1655 vc->vc_pos -= (vc->vc_x << 1);
1656 while (vc->vc_x < vc->vc_cols - 1) {
1657 vc->vc_x++;
1658 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1659 break;
1660 }
1661 vc->vc_pos += (vc->vc_x << 1);
1662 notify_write(vc, '\t');
1663 return;
1664 case 10: case 11: case 12:
1665 lf(vc);
1666 if (!is_kbd(vc, lnm))
1667 return;
1668 case 13:
1669 cr(vc);
1670 return;
1671 case 14:
1672 vc->vc_charset = 1;
1673 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1674 vc->vc_disp_ctrl = 1;
1675 return;
1676 case 15:
1677 vc->vc_charset = 0;
1678 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1679 vc->vc_disp_ctrl = 0;
1680 return;
1681 case 24: case 26:
1682 vc->vc_state = ESnormal;
1683 return;
1684 case 27:
1685 vc->vc_state = ESesc;
1686 return;
1687 case 127:
1688 del(vc);
1689 return;
1690 case 128+27:
1691 vc->vc_state = ESsquare;
1692 return;
1693 }
1694 switch(vc->vc_state) {
1695 case ESesc:
1696 vc->vc_state = ESnormal;
1697 switch (c) {
1698 case '[':
1699 vc->vc_state = ESsquare;
1700 return;
1701 case ']':
1702 vc->vc_state = ESnonstd;
1703 return;
1704 case '%':
1705 vc->vc_state = ESpercent;
1706 return;
1707 case 'E':
1708 cr(vc);
1709 lf(vc);
1710 return;
1711 case 'M':
1712 ri(vc);
1713 return;
1714 case 'D':
1715 lf(vc);
1716 return;
1717 case 'H':
1718 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1719 return;
1720 case 'Z':
1721 respond_ID(tty);
1722 return;
1723 case '7':
1724 save_cur(vc);
1725 return;
1726 case '8':
1727 restore_cur(vc);
1728 return;
1729 case '(':
1730 vc->vc_state = ESsetG0;
1731 return;
1732 case ')':
1733 vc->vc_state = ESsetG1;
1734 return;
1735 case '#':
1736 vc->vc_state = EShash;
1737 return;
1738 case 'c':
1739 reset_terminal(vc, 1);
1740 return;
1741 case '>': /* Numeric keypad */
1742 clr_kbd(vc, kbdapplic);
1743 return;
1744 case '=': /* Appl. keypad */
1745 set_kbd(vc, kbdapplic);
1746 return;
1747 }
1748 return;
1749 case ESnonstd:
1750 if (c=='P') { /* palette escape sequence */
1751 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1752 vc->vc_par[vc->vc_npar] = 0;
1753 vc->vc_npar = 0;
1754 vc->vc_state = ESpalette;
1755 return;
1756 } else if (c=='R') { /* reset palette */
1757 reset_palette(vc);
1758 vc->vc_state = ESnormal;
1759 } else
1760 vc->vc_state = ESnormal;
1761 return;
1762 case ESpalette:
1763 if (isxdigit(c)) {
1764 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1765 if (vc->vc_npar == 7) {
1766 int i = vc->vc_par[0] * 3, j = 1;
1767 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1768 vc->vc_palette[i++] += vc->vc_par[j++];
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 set_palette(vc);
1774 vc->vc_state = ESnormal;
1775 }
1776 } else
1777 vc->vc_state = ESnormal;
1778 return;
1779 case ESsquare:
1780 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1781 vc->vc_par[vc->vc_npar] = 0;
1782 vc->vc_npar = 0;
1783 vc->vc_state = ESgetpars;
1784 if (c == '[') { /* Function key */
1785 vc->vc_state=ESfunckey;
1786 return;
1787 }
1788 vc->vc_ques = (c == '?');
1789 if (vc->vc_ques)
1790 return;
1791 case ESgetpars:
1792 if (c == ';' && vc->vc_npar < NPAR - 1) {
1793 vc->vc_npar++;
1794 return;
1795 } else if (c>='0' && c<='9') {
1796 vc->vc_par[vc->vc_npar] *= 10;
1797 vc->vc_par[vc->vc_npar] += c - '0';
1798 return;
1799 } else
1800 vc->vc_state = ESgotpars;
1801 case ESgotpars:
1802 vc->vc_state = ESnormal;
1803 switch(c) {
1804 case 'h':
1805 set_mode(vc, 1);
1806 return;
1807 case 'l':
1808 set_mode(vc, 0);
1809 return;
1810 case 'c':
1811 if (vc->vc_ques) {
1812 if (vc->vc_par[0])
1813 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1814 else
1815 vc->vc_cursor_type = cur_default;
1816 return;
1817 }
1818 break;
1819 case 'm':
1820 if (vc->vc_ques) {
1821 clear_selection();
1822 if (vc->vc_par[0])
1823 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1824 else
1825 vc->vc_complement_mask = vc->vc_s_complement_mask;
1826 return;
1827 }
1828 break;
1829 case 'n':
1830 if (!vc->vc_ques) {
1831 if (vc->vc_par[0] == 5)
1832 status_report(tty);
1833 else if (vc->vc_par[0] == 6)
1834 cursor_report(vc, tty);
1835 }
1836 return;
1837 }
1838 if (vc->vc_ques) {
1839 vc->vc_ques = 0;
1840 return;
1841 }
1842 switch(c) {
1843 case 'G': case '`':
1844 if (vc->vc_par[0])
1845 vc->vc_par[0]--;
1846 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1847 return;
1848 case 'A':
1849 if (!vc->vc_par[0])
1850 vc->vc_par[0]++;
1851 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1852 return;
1853 case 'B': case 'e':
1854 if (!vc->vc_par[0])
1855 vc->vc_par[0]++;
1856 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1857 return;
1858 case 'C': case 'a':
1859 if (!vc->vc_par[0])
1860 vc->vc_par[0]++;
1861 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1862 return;
1863 case 'D':
1864 if (!vc->vc_par[0])
1865 vc->vc_par[0]++;
1866 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1867 return;
1868 case 'E':
1869 if (!vc->vc_par[0])
1870 vc->vc_par[0]++;
1871 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1872 return;
1873 case 'F':
1874 if (!vc->vc_par[0])
1875 vc->vc_par[0]++;
1876 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1877 return;
1878 case 'd':
1879 if (vc->vc_par[0])
1880 vc->vc_par[0]--;
1881 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1882 return;
1883 case 'H': case 'f':
1884 if (vc->vc_par[0])
1885 vc->vc_par[0]--;
1886 if (vc->vc_par[1])
1887 vc->vc_par[1]--;
1888 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1889 return;
1890 case 'J':
1891 csi_J(vc, vc->vc_par[0]);
1892 return;
1893 case 'K':
1894 csi_K(vc, vc->vc_par[0]);
1895 return;
1896 case 'L':
1897 csi_L(vc, vc->vc_par[0]);
1898 return;
1899 case 'M':
1900 csi_M(vc, vc->vc_par[0]);
1901 return;
1902 case 'P':
1903 csi_P(vc, vc->vc_par[0]);
1904 return;
1905 case 'c':
1906 if (!vc->vc_par[0])
1907 respond_ID(tty);
1908 return;
1909 case 'g':
1910 if (!vc->vc_par[0])
1911 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1912 else if (vc->vc_par[0] == 3) {
1913 vc->vc_tab_stop[0] =
1914 vc->vc_tab_stop[1] =
1915 vc->vc_tab_stop[2] =
1916 vc->vc_tab_stop[3] =
1917 vc->vc_tab_stop[4] =
1918 vc->vc_tab_stop[5] =
1919 vc->vc_tab_stop[6] =
1920 vc->vc_tab_stop[7] = 0;
1921 }
1922 return;
1923 case 'm':
1924 csi_m(vc);
1925 return;
1926 case 'q': /* DECLL - but only 3 leds */
1927 /* map 0,1,2,3 to 0,1,2,4 */
1928 if (vc->vc_par[0] < 4)
1929 vt_set_led_state(vc->vc_num,
1930 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1931 return;
1932 case 'r':
1933 if (!vc->vc_par[0])
1934 vc->vc_par[0]++;
1935 if (!vc->vc_par[1])
1936 vc->vc_par[1] = vc->vc_rows;
1937 /* Minimum allowed region is 2 lines */
1938 if (vc->vc_par[0] < vc->vc_par[1] &&
1939 vc->vc_par[1] <= vc->vc_rows) {
1940 vc->vc_top = vc->vc_par[0] - 1;
1941 vc->vc_bottom = vc->vc_par[1];
1942 gotoxay(vc, 0, 0);
1943 }
1944 return;
1945 case 's':
1946 save_cur(vc);
1947 return;
1948 case 'u':
1949 restore_cur(vc);
1950 return;
1951 case 'X':
1952 csi_X(vc, vc->vc_par[0]);
1953 return;
1954 case '@':
1955 csi_at(vc, vc->vc_par[0]);
1956 return;
1957 case ']': /* setterm functions */
1958 setterm_command(vc);
1959 return;
1960 }
1961 return;
1962 case ESpercent:
1963 vc->vc_state = ESnormal;
1964 switch (c) {
1965 case '@': /* defined in ISO 2022 */
1966 vc->vc_utf = 0;
1967 return;
1968 case 'G': /* prelim official escape code */
1969 case '8': /* retained for compatibility */
1970 vc->vc_utf = 1;
1971 return;
1972 }
1973 return;
1974 case ESfunckey:
1975 vc->vc_state = ESnormal;
1976 return;
1977 case EShash:
1978 vc->vc_state = ESnormal;
1979 if (c == '8') {
1980 /* DEC screen alignment test. kludge :-) */
1981 vc->vc_video_erase_char =
1982 (vc->vc_video_erase_char & 0xff00) | 'E';
1983 csi_J(vc, 2);
1984 vc->vc_video_erase_char =
1985 (vc->vc_video_erase_char & 0xff00) | ' ';
1986 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1987 }
1988 return;
1989 case ESsetG0:
1990 if (c == '0')
1991 vc->vc_G0_charset = GRAF_MAP;
1992 else if (c == 'B')
1993 vc->vc_G0_charset = LAT1_MAP;
1994 else if (c == 'U')
1995 vc->vc_G0_charset = IBMPC_MAP;
1996 else if (c == 'K')
1997 vc->vc_G0_charset = USER_MAP;
1998 if (vc->vc_charset == 0)
1999 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2000 vc->vc_state = ESnormal;
2001 return;
2002 case ESsetG1:
2003 if (c == '0')
2004 vc->vc_G1_charset = GRAF_MAP;
2005 else if (c == 'B')
2006 vc->vc_G1_charset = LAT1_MAP;
2007 else if (c == 'U')
2008 vc->vc_G1_charset = IBMPC_MAP;
2009 else if (c == 'K')
2010 vc->vc_G1_charset = USER_MAP;
2011 if (vc->vc_charset == 1)
2012 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2013 vc->vc_state = ESnormal;
2014 return;
2015 default:
2016 vc->vc_state = ESnormal;
2017 }
2018 }
2019
2020 /* is_double_width() is based on the wcwidth() implementation by
2021 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2022 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2023 */
2024 struct interval {
2025 uint32_t first;
2026 uint32_t last;
2027 };
2028
2029 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2030 {
2031 int min = 0;
2032 int mid;
2033
2034 if (ucs < table[0].first || ucs > table[max].last)
2035 return 0;
2036 while (max >= min) {
2037 mid = (min + max) / 2;
2038 if (ucs > table[mid].last)
2039 min = mid + 1;
2040 else if (ucs < table[mid].first)
2041 max = mid - 1;
2042 else
2043 return 1;
2044 }
2045 return 0;
2046 }
2047
2048 static int is_double_width(uint32_t ucs)
2049 {
2050 static const struct interval double_width[] = {
2051 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2052 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2053 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2054 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2055 };
2056 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2057 }
2058
2059 /* acquires console_lock */
2060 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2061 {
2062 #ifdef VT_BUF_VRAM_ONLY
2063 #define FLUSH do { } while(0);
2064 #else
2065 #define FLUSH if (draw_x >= 0) { \
2066 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2067 draw_x = -1; \
2068 }
2069 #endif
2070
2071 int c, tc, ok, n = 0, draw_x = -1;
2072 unsigned int currcons;
2073 unsigned long draw_from = 0, draw_to = 0;
2074 struct vc_data *vc;
2075 unsigned char vc_attr;
2076 struct vt_notifier_param param;
2077 uint8_t rescan;
2078 uint8_t inverse;
2079 uint8_t width;
2080 u16 himask, charmask;
2081
2082 if (in_interrupt())
2083 return count;
2084
2085 might_sleep();
2086
2087 console_lock();
2088 vc = tty->driver_data;
2089 if (vc == NULL) {
2090 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2091 console_unlock();
2092 return 0;
2093 }
2094
2095 currcons = vc->vc_num;
2096 if (!vc_cons_allocated(currcons)) {
2097 /* could this happen? */
2098 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2099 console_unlock();
2100 return 0;
2101 }
2102
2103 himask = vc->vc_hi_font_mask;
2104 charmask = himask ? 0x1ff : 0xff;
2105
2106 /* undraw cursor first */
2107 if (IS_FG(vc))
2108 hide_cursor(vc);
2109
2110 param.vc = vc;
2111
2112 while (!tty->stopped && count) {
2113 int orig = *buf;
2114 c = orig;
2115 buf++;
2116 n++;
2117 count--;
2118 rescan = 0;
2119 inverse = 0;
2120 width = 1;
2121
2122 /* Do no translation at all in control states */
2123 if (vc->vc_state != ESnormal) {
2124 tc = c;
2125 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2126 /* Combine UTF-8 into Unicode in vc_utf_char.
2127 * vc_utf_count is the number of continuation bytes still
2128 * expected to arrive.
2129 * vc_npar is the number of continuation bytes arrived so
2130 * far
2131 */
2132 rescan_last_byte:
2133 if ((c & 0xc0) == 0x80) {
2134 /* Continuation byte received */
2135 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2136 if (vc->vc_utf_count) {
2137 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2138 vc->vc_npar++;
2139 if (--vc->vc_utf_count) {
2140 /* Still need some bytes */
2141 continue;
2142 }
2143 /* Got a whole character */
2144 c = vc->vc_utf_char;
2145 /* Reject overlong sequences */
2146 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2147 c > utf8_length_changes[vc->vc_npar])
2148 c = 0xfffd;
2149 } else {
2150 /* Unexpected continuation byte */
2151 vc->vc_utf_count = 0;
2152 c = 0xfffd;
2153 }
2154 } else {
2155 /* Single ASCII byte or first byte of a sequence received */
2156 if (vc->vc_utf_count) {
2157 /* Continuation byte expected */
2158 rescan = 1;
2159 vc->vc_utf_count = 0;
2160 c = 0xfffd;
2161 } else if (c > 0x7f) {
2162 /* First byte of a multibyte sequence received */
2163 vc->vc_npar = 0;
2164 if ((c & 0xe0) == 0xc0) {
2165 vc->vc_utf_count = 1;
2166 vc->vc_utf_char = (c & 0x1f);
2167 } else if ((c & 0xf0) == 0xe0) {
2168 vc->vc_utf_count = 2;
2169 vc->vc_utf_char = (c & 0x0f);
2170 } else if ((c & 0xf8) == 0xf0) {
2171 vc->vc_utf_count = 3;
2172 vc->vc_utf_char = (c & 0x07);
2173 } else if ((c & 0xfc) == 0xf8) {
2174 vc->vc_utf_count = 4;
2175 vc->vc_utf_char = (c & 0x03);
2176 } else if ((c & 0xfe) == 0xfc) {
2177 vc->vc_utf_count = 5;
2178 vc->vc_utf_char = (c & 0x01);
2179 } else {
2180 /* 254 and 255 are invalid */
2181 c = 0xfffd;
2182 }
2183 if (vc->vc_utf_count) {
2184 /* Still need some bytes */
2185 continue;
2186 }
2187 }
2188 /* Nothing to do if an ASCII byte was received */
2189 }
2190 /* End of UTF-8 decoding. */
2191 /* c is the received character, or U+FFFD for invalid sequences. */
2192 /* Replace invalid Unicode code points with U+FFFD too */
2193 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2194 c = 0xfffd;
2195 tc = c;
2196 } else { /* no utf or alternate charset mode */
2197 tc = vc_translate(vc, c);
2198 }
2199
2200 param.c = tc;
2201 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2202 &param) == NOTIFY_STOP)
2203 continue;
2204
2205 /* If the original code was a control character we
2206 * only allow a glyph to be displayed if the code is
2207 * not normally used (such as for cursor movement) or
2208 * if the disp_ctrl mode has been explicitly enabled.
2209 * Certain characters (as given by the CTRL_ALWAYS
2210 * bitmap) are always displayed as control characters,
2211 * as the console would be pretty useless without
2212 * them; to display an arbitrary font position use the
2213 * direct-to-font zone in UTF-8 mode.
2214 */
2215 ok = tc && (c >= 32 ||
2216 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2217 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2218 && (c != 127 || vc->vc_disp_ctrl)
2219 && (c != 128+27);
2220
2221 if (vc->vc_state == ESnormal && ok) {
2222 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2223 if (is_double_width(c))
2224 width = 2;
2225 }
2226 /* Now try to find out how to display it */
2227 tc = conv_uni_to_pc(vc, tc);
2228 if (tc & ~charmask) {
2229 if (tc == -1 || tc == -2) {
2230 continue; /* nothing to display */
2231 }
2232 /* Glyph not found */
2233 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2234 /* In legacy mode use the glyph we get by a 1:1 mapping.
2235 This would make absolutely no sense with Unicode in mind,
2236 but do this for ASCII characters since a font may lack
2237 Unicode mapping info and we don't want to end up with
2238 having question marks only. */
2239 tc = c;
2240 } else {
2241 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2242 tc = conv_uni_to_pc(vc, 0xfffd);
2243 if (tc < 0) {
2244 inverse = 1;
2245 tc = conv_uni_to_pc(vc, '?');
2246 if (tc < 0) tc = '?';
2247 }
2248 }
2249 }
2250
2251 if (!inverse) {
2252 vc_attr = vc->vc_attr;
2253 } else {
2254 /* invert vc_attr */
2255 if (!vc->vc_can_do_color) {
2256 vc_attr = (vc->vc_attr) ^ 0x08;
2257 } else if (vc->vc_hi_font_mask == 0x100) {
2258 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2259 } else {
2260 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2261 }
2262 FLUSH
2263 }
2264
2265 while (1) {
2266 if (vc->vc_need_wrap || vc->vc_decim)
2267 FLUSH
2268 if (vc->vc_need_wrap) {
2269 cr(vc);
2270 lf(vc);
2271 }
2272 if (vc->vc_decim)
2273 insert_char(vc, 1);
2274 scr_writew(himask ?
2275 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2276 (vc_attr << 8) + tc,
2277 (u16 *) vc->vc_pos);
2278 if (DO_UPDATE(vc) && draw_x < 0) {
2279 draw_x = vc->vc_x;
2280 draw_from = vc->vc_pos;
2281 }
2282 if (vc->vc_x == vc->vc_cols - 1) {
2283 vc->vc_need_wrap = vc->vc_decawm;
2284 draw_to = vc->vc_pos + 2;
2285 } else {
2286 vc->vc_x++;
2287 draw_to = (vc->vc_pos += 2);
2288 }
2289
2290 if (!--width) break;
2291
2292 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2293 if (tc < 0) tc = ' ';
2294 }
2295 notify_write(vc, c);
2296
2297 if (inverse) {
2298 FLUSH
2299 }
2300
2301 if (rescan) {
2302 rescan = 0;
2303 inverse = 0;
2304 width = 1;
2305 c = orig;
2306 goto rescan_last_byte;
2307 }
2308 continue;
2309 }
2310 FLUSH
2311 do_con_trol(tty, vc, orig);
2312 }
2313 FLUSH
2314 console_conditional_schedule();
2315 console_unlock();
2316 notify_update(vc);
2317 return n;
2318 #undef FLUSH
2319 }
2320
2321 /*
2322 * This is the console switching callback.
2323 *
2324 * Doing console switching in a process context allows
2325 * us to do the switches asynchronously (needed when we want
2326 * to switch due to a keyboard interrupt). Synchronization
2327 * with other console code and prevention of re-entrancy is
2328 * ensured with console_lock.
2329 */
2330 static void console_callback(struct work_struct *ignored)
2331 {
2332 console_lock();
2333
2334 if (want_console >= 0) {
2335 if (want_console != fg_console &&
2336 vc_cons_allocated(want_console)) {
2337 hide_cursor(vc_cons[fg_console].d);
2338 change_console(vc_cons[want_console].d);
2339 /* we only changed when the console had already
2340 been allocated - a new console is not created
2341 in an interrupt routine */
2342 }
2343 want_console = -1;
2344 }
2345 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2346 do_poke_blanked_console = 0;
2347 poke_blanked_console();
2348 }
2349 if (scrollback_delta) {
2350 struct vc_data *vc = vc_cons[fg_console].d;
2351 clear_selection();
2352 if (vc->vc_mode == KD_TEXT)
2353 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2354 scrollback_delta = 0;
2355 }
2356 if (blank_timer_expired) {
2357 do_blank_screen(0);
2358 blank_timer_expired = 0;
2359 }
2360 notify_update(vc_cons[fg_console].d);
2361
2362 console_unlock();
2363 }
2364
2365 int set_console(int nr)
2366 {
2367 struct vc_data *vc = vc_cons[fg_console].d;
2368
2369 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2370 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2371
2372 /*
2373 * Console switch will fail in console_callback() or
2374 * change_console() so there is no point scheduling
2375 * the callback
2376 *
2377 * Existing set_console() users don't check the return
2378 * value so this shouldn't break anything
2379 */
2380 return -EINVAL;
2381 }
2382
2383 want_console = nr;
2384 schedule_console_callback();
2385
2386 return 0;
2387 }
2388
2389 struct tty_driver *console_driver;
2390
2391 #ifdef CONFIG_VT_CONSOLE
2392
2393 /**
2394 * vt_kmsg_redirect() - Sets/gets the kernel message console
2395 * @new: The new virtual terminal number or -1 if the console should stay
2396 * unchanged
2397 *
2398 * By default, the kernel messages are always printed on the current virtual
2399 * console. However, the user may modify that default with the
2400 * TIOCL_SETKMSGREDIRECT ioctl call.
2401 *
2402 * This function sets the kernel message console to be @new. It returns the old
2403 * virtual console number. The virtual terminal number 0 (both as parameter and
2404 * return value) means no redirection (i.e. always printed on the currently
2405 * active console).
2406 *
2407 * The parameter -1 means that only the current console is returned, but the
2408 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2409 * case to make the code more understandable.
2410 *
2411 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2412 * the parameter and always returns 0.
2413 */
2414 int vt_kmsg_redirect(int new)
2415 {
2416 static int kmsg_con;
2417
2418 if (new != -1)
2419 return xchg(&kmsg_con, new);
2420 else
2421 return kmsg_con;
2422 }
2423
2424 /*
2425 * Console on virtual terminal
2426 *
2427 * The console must be locked when we get here.
2428 */
2429
2430 static void vt_console_print(struct console *co, const char *b, unsigned count)
2431 {
2432 struct vc_data *vc = vc_cons[fg_console].d;
2433 unsigned char c;
2434 static DEFINE_SPINLOCK(printing_lock);
2435 const ushort *start;
2436 ushort cnt = 0;
2437 ushort myx;
2438 int kmsg_console;
2439
2440 /* console busy or not yet initialized */
2441 if (!printable)
2442 return;
2443 if (!spin_trylock(&printing_lock))
2444 return;
2445
2446 kmsg_console = vt_get_kmsg_redirect();
2447 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2448 vc = vc_cons[kmsg_console - 1].d;
2449
2450 /* read `x' only after setting currcons properly (otherwise
2451 the `x' macro will read the x of the foreground console). */
2452 myx = vc->vc_x;
2453
2454 if (!vc_cons_allocated(fg_console)) {
2455 /* impossible */
2456 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2457 goto quit;
2458 }
2459
2460 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2461 goto quit;
2462
2463 /* undraw cursor first */
2464 if (IS_FG(vc))
2465 hide_cursor(vc);
2466
2467 start = (ushort *)vc->vc_pos;
2468
2469 /* Contrived structure to try to emulate original need_wrap behaviour
2470 * Problems caused when we have need_wrap set on '\n' character */
2471 while (count--) {
2472 c = *b++;
2473 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2474 if (cnt > 0) {
2475 if (CON_IS_VISIBLE(vc))
2476 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2477 vc->vc_x += cnt;
2478 if (vc->vc_need_wrap)
2479 vc->vc_x--;
2480 cnt = 0;
2481 }
2482 if (c == 8) { /* backspace */
2483 bs(vc);
2484 start = (ushort *)vc->vc_pos;
2485 myx = vc->vc_x;
2486 continue;
2487 }
2488 if (c != 13)
2489 lf(vc);
2490 cr(vc);
2491 start = (ushort *)vc->vc_pos;
2492 myx = vc->vc_x;
2493 if (c == 10 || c == 13)
2494 continue;
2495 }
2496 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2497 notify_write(vc, c);
2498 cnt++;
2499 if (myx == vc->vc_cols - 1) {
2500 vc->vc_need_wrap = 1;
2501 continue;
2502 }
2503 vc->vc_pos += 2;
2504 myx++;
2505 }
2506 if (cnt > 0) {
2507 if (CON_IS_VISIBLE(vc))
2508 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2509 vc->vc_x += cnt;
2510 if (vc->vc_x == vc->vc_cols) {
2511 vc->vc_x--;
2512 vc->vc_need_wrap = 1;
2513 }
2514 }
2515 set_cursor(vc);
2516 notify_update(vc);
2517
2518 quit:
2519 spin_unlock(&printing_lock);
2520 }
2521
2522 static struct tty_driver *vt_console_device(struct console *c, int *index)
2523 {
2524 *index = c->index ? c->index-1 : fg_console;
2525 return console_driver;
2526 }
2527
2528 static struct console vt_console_driver = {
2529 .name = "tty",
2530 .write = vt_console_print,
2531 .device = vt_console_device,
2532 .unblank = unblank_screen,
2533 .flags = CON_PRINTBUFFER,
2534 .index = -1,
2535 };
2536 #endif
2537
2538 /*
2539 * Handling of Linux-specific VC ioctls
2540 */
2541
2542 /*
2543 * Generally a bit racy with respect to console_lock();.
2544 *
2545 * There are some functions which don't need it.
2546 *
2547 * There are some functions which can sleep for arbitrary periods
2548 * (paste_selection) but we don't need the lock there anyway.
2549 *
2550 * set_selection has locking, and definitely needs it
2551 */
2552
2553 int tioclinux(struct tty_struct *tty, unsigned long arg)
2554 {
2555 char type, data;
2556 char __user *p = (char __user *)arg;
2557 int lines;
2558 int ret;
2559
2560 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2561 return -EPERM;
2562 if (get_user(type, p))
2563 return -EFAULT;
2564 ret = 0;
2565
2566 switch (type)
2567 {
2568 case TIOCL_SETSEL:
2569 console_lock();
2570 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2571 console_unlock();
2572 break;
2573 case TIOCL_PASTESEL:
2574 ret = paste_selection(tty);
2575 break;
2576 case TIOCL_UNBLANKSCREEN:
2577 console_lock();
2578 unblank_screen();
2579 console_unlock();
2580 break;
2581 case TIOCL_SELLOADLUT:
2582 console_lock();
2583 ret = sel_loadlut(p);
2584 console_unlock();
2585 break;
2586 case TIOCL_GETSHIFTSTATE:
2587
2588 /*
2589 * Make it possible to react to Shift+Mousebutton.
2590 * Note that 'shift_state' is an undocumented
2591 * kernel-internal variable; programs not closely
2592 * related to the kernel should not use this.
2593 */
2594 data = vt_get_shift_state();
2595 ret = __put_user(data, p);
2596 break;
2597 case TIOCL_GETMOUSEREPORTING:
2598 console_lock(); /* May be overkill */
2599 data = mouse_reporting();
2600 console_unlock();
2601 ret = __put_user(data, p);
2602 break;
2603 case TIOCL_SETVESABLANK:
2604 console_lock();
2605 ret = set_vesa_blanking(p);
2606 console_unlock();
2607 break;
2608 case TIOCL_GETKMSGREDIRECT:
2609 data = vt_get_kmsg_redirect();
2610 ret = __put_user(data, p);
2611 break;
2612 case TIOCL_SETKMSGREDIRECT:
2613 if (!capable(CAP_SYS_ADMIN)) {
2614 ret = -EPERM;
2615 } else {
2616 if (get_user(data, p+1))
2617 ret = -EFAULT;
2618 else
2619 vt_kmsg_redirect(data);
2620 }
2621 break;
2622 case TIOCL_GETFGCONSOLE:
2623 /* No locking needed as this is a transiently
2624 correct return anyway if the caller hasn't
2625 disabled switching */
2626 ret = fg_console;
2627 break;
2628 case TIOCL_SCROLLCONSOLE:
2629 if (get_user(lines, (s32 __user *)(p+4))) {
2630 ret = -EFAULT;
2631 } else {
2632 /* Need the console lock here. Note that lots
2633 of other calls need fixing before the lock
2634 is actually useful ! */
2635 console_lock();
2636 scrollfront(vc_cons[fg_console].d, lines);
2637 console_unlock();
2638 ret = 0;
2639 }
2640 break;
2641 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2642 console_lock();
2643 ignore_poke = 1;
2644 do_blank_screen(0);
2645 console_unlock();
2646 break;
2647 case TIOCL_BLANKEDSCREEN:
2648 ret = console_blanked;
2649 break;
2650 default:
2651 ret = -EINVAL;
2652 break;
2653 }
2654 return ret;
2655 }
2656
2657 /*
2658 * /dev/ttyN handling
2659 */
2660
2661 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2662 {
2663 int retval;
2664
2665 retval = do_con_write(tty, buf, count);
2666 con_flush_chars(tty);
2667
2668 return retval;
2669 }
2670
2671 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2672 {
2673 if (in_interrupt())
2674 return 0; /* n_r3964 calls put_char() from interrupt context */
2675 return do_con_write(tty, &ch, 1);
2676 }
2677
2678 static int con_write_room(struct tty_struct *tty)
2679 {
2680 if (tty->stopped)
2681 return 0;
2682 return 32768; /* No limit, really; we're not buffering */
2683 }
2684
2685 static int con_chars_in_buffer(struct tty_struct *tty)
2686 {
2687 return 0; /* we're not buffering */
2688 }
2689
2690 /*
2691 * con_throttle and con_unthrottle are only used for
2692 * paste_selection(), which has to stuff in a large number of
2693 * characters...
2694 */
2695 static void con_throttle(struct tty_struct *tty)
2696 {
2697 }
2698
2699 static void con_unthrottle(struct tty_struct *tty)
2700 {
2701 struct vc_data *vc = tty->driver_data;
2702
2703 wake_up_interruptible(&vc->paste_wait);
2704 }
2705
2706 /*
2707 * Turn the Scroll-Lock LED on when the tty is stopped
2708 */
2709 static void con_stop(struct tty_struct *tty)
2710 {
2711 int console_num;
2712 if (!tty)
2713 return;
2714 console_num = tty->index;
2715 if (!vc_cons_allocated(console_num))
2716 return;
2717 vt_kbd_con_stop(console_num);
2718 }
2719
2720 /*
2721 * Turn the Scroll-Lock LED off when the console is started
2722 */
2723 static void con_start(struct tty_struct *tty)
2724 {
2725 int console_num;
2726 if (!tty)
2727 return;
2728 console_num = tty->index;
2729 if (!vc_cons_allocated(console_num))
2730 return;
2731 vt_kbd_con_start(console_num);
2732 }
2733
2734 static void con_flush_chars(struct tty_struct *tty)
2735 {
2736 struct vc_data *vc;
2737
2738 if (in_interrupt()) /* from flush_to_ldisc */
2739 return;
2740
2741 /* if we race with con_close(), vt may be null */
2742 console_lock();
2743 vc = tty->driver_data;
2744 if (vc)
2745 set_cursor(vc);
2746 console_unlock();
2747 }
2748
2749 /*
2750 * Allocate the console screen memory.
2751 */
2752 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2753 {
2754 unsigned int currcons = tty->index;
2755 struct vc_data *vc;
2756 int ret;
2757
2758 console_lock();
2759 ret = vc_allocate(currcons);
2760 if (ret)
2761 goto unlock;
2762
2763 vc = vc_cons[currcons].d;
2764
2765 /* Still being freed */
2766 if (vc->port.tty) {
2767 ret = -ERESTARTSYS;
2768 goto unlock;
2769 }
2770
2771 ret = tty_port_install(&vc->port, driver, tty);
2772 if (ret)
2773 goto unlock;
2774
2775 tty->driver_data = vc;
2776 vc->port.tty = tty;
2777
2778 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2779 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2780 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2781 }
2782 if (vc->vc_utf)
2783 tty->termios.c_iflag |= IUTF8;
2784 else
2785 tty->termios.c_iflag &= ~IUTF8;
2786 unlock:
2787 console_unlock();
2788 return ret;
2789 }
2790
2791 static int con_open(struct tty_struct *tty, struct file *filp)
2792 {
2793 /* everything done in install */
2794 return 0;
2795 }
2796
2797
2798 static void con_close(struct tty_struct *tty, struct file *filp)
2799 {
2800 /* Nothing to do - we defer to shutdown */
2801 }
2802
2803 static void con_shutdown(struct tty_struct *tty)
2804 {
2805 struct vc_data *vc = tty->driver_data;
2806 BUG_ON(vc == NULL);
2807 console_lock();
2808 vc->port.tty = NULL;
2809 console_unlock();
2810 }
2811
2812 static int default_italic_color = 2; // green (ASCII)
2813 static int default_underline_color = 3; // cyan (ASCII)
2814 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2815 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2816
2817 static void vc_init(struct vc_data *vc, unsigned int rows,
2818 unsigned int cols, int do_clear)
2819 {
2820 int j, k ;
2821
2822 vc->vc_cols = cols;
2823 vc->vc_rows = rows;
2824 vc->vc_size_row = cols << 1;
2825 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2826
2827 set_origin(vc);
2828 vc->vc_pos = vc->vc_origin;
2829 reset_vc(vc);
2830 for (j=k=0; j<16; j++) {
2831 vc->vc_palette[k++] = default_red[j] ;
2832 vc->vc_palette[k++] = default_grn[j] ;
2833 vc->vc_palette[k++] = default_blu[j] ;
2834 }
2835 vc->vc_def_color = 0x07; /* white */
2836 vc->vc_ulcolor = default_underline_color;
2837 vc->vc_itcolor = default_italic_color;
2838 vc->vc_halfcolor = 0x08; /* grey */
2839 init_waitqueue_head(&vc->paste_wait);
2840 reset_terminal(vc, do_clear);
2841 }
2842
2843 /*
2844 * This routine initializes console interrupts, and does nothing
2845 * else. If you want the screen to clear, call tty_write with
2846 * the appropriate escape-sequence.
2847 */
2848
2849 static int __init con_init(void)
2850 {
2851 const char *display_desc = NULL;
2852 struct vc_data *vc;
2853 unsigned int currcons = 0, i;
2854
2855 console_lock();
2856
2857 if (conswitchp)
2858 display_desc = conswitchp->con_startup();
2859 if (!display_desc) {
2860 fg_console = 0;
2861 console_unlock();
2862 return 0;
2863 }
2864
2865 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2866 struct con_driver *con_driver = &registered_con_driver[i];
2867
2868 if (con_driver->con == NULL) {
2869 con_driver->con = conswitchp;
2870 con_driver->desc = display_desc;
2871 con_driver->flag = CON_DRIVER_FLAG_INIT;
2872 con_driver->first = 0;
2873 con_driver->last = MAX_NR_CONSOLES - 1;
2874 break;
2875 }
2876 }
2877
2878 for (i = 0; i < MAX_NR_CONSOLES; i++)
2879 con_driver_map[i] = conswitchp;
2880
2881 if (blankinterval) {
2882 blank_state = blank_normal_wait;
2883 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2884 }
2885
2886 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2887 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2888 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2889 tty_port_init(&vc->port);
2890 visual_init(vc, currcons, 1);
2891 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2892 vc_init(vc, vc->vc_rows, vc->vc_cols,
2893 currcons || !vc->vc_sw->con_save_screen);
2894 }
2895 currcons = fg_console = 0;
2896 master_display_fg = vc = vc_cons[currcons].d;
2897 set_origin(vc);
2898 save_screen(vc);
2899 gotoxy(vc, vc->vc_x, vc->vc_y);
2900 csi_J(vc, 0);
2901 update_screen(vc);
2902 pr_info("Console: %s %s %dx%d\n",
2903 vc->vc_can_do_color ? "colour" : "mono",
2904 display_desc, vc->vc_cols, vc->vc_rows);
2905 printable = 1;
2906
2907 console_unlock();
2908
2909 #ifdef CONFIG_VT_CONSOLE
2910 register_console(&vt_console_driver);
2911 #endif
2912 return 0;
2913 }
2914 console_initcall(con_init);
2915
2916 static const struct tty_operations con_ops = {
2917 .install = con_install,
2918 .open = con_open,
2919 .close = con_close,
2920 .write = con_write,
2921 .write_room = con_write_room,
2922 .put_char = con_put_char,
2923 .flush_chars = con_flush_chars,
2924 .chars_in_buffer = con_chars_in_buffer,
2925 .ioctl = vt_ioctl,
2926 #ifdef CONFIG_COMPAT
2927 .compat_ioctl = vt_compat_ioctl,
2928 #endif
2929 .stop = con_stop,
2930 .start = con_start,
2931 .throttle = con_throttle,
2932 .unthrottle = con_unthrottle,
2933 .resize = vt_resize,
2934 .shutdown = con_shutdown
2935 };
2936
2937 static struct cdev vc0_cdev;
2938
2939 static ssize_t show_tty_active(struct device *dev,
2940 struct device_attribute *attr, char *buf)
2941 {
2942 return sprintf(buf, "tty%d\n", fg_console + 1);
2943 }
2944 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2945
2946 int __init vty_init(const struct file_operations *console_fops)
2947 {
2948 cdev_init(&vc0_cdev, console_fops);
2949 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2950 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2951 panic("Couldn't register /dev/tty0 driver\n");
2952 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2953 if (IS_ERR(tty0dev))
2954 tty0dev = NULL;
2955 else
2956 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2957
2958 vcs_init();
2959
2960 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2961 if (!console_driver)
2962 panic("Couldn't allocate console driver\n");
2963
2964 console_driver->name = "tty";
2965 console_driver->name_base = 1;
2966 console_driver->major = TTY_MAJOR;
2967 console_driver->minor_start = 1;
2968 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2969 console_driver->init_termios = tty_std_termios;
2970 if (default_utf8)
2971 console_driver->init_termios.c_iflag |= IUTF8;
2972 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2973 tty_set_operations(console_driver, &con_ops);
2974 if (tty_register_driver(console_driver))
2975 panic("Couldn't register console driver\n");
2976 kbd_init();
2977 console_map_init();
2978 #ifdef CONFIG_MDA_CONSOLE
2979 mda_console_init();
2980 #endif
2981 return 0;
2982 }
2983
2984 #ifndef VT_SINGLE_DRIVER
2985
2986 static struct class *vtconsole_class;
2987
2988 static int do_bind_con_driver(const struct consw *csw, int first, int last,
2989 int deflt)
2990 {
2991 struct module *owner = csw->owner;
2992 const char *desc = NULL;
2993 struct con_driver *con_driver;
2994 int i, j = -1, k = -1, retval = -ENODEV;
2995
2996 if (!try_module_get(owner))
2997 return -ENODEV;
2998
2999 WARN_CONSOLE_UNLOCKED();
3000
3001 /* check if driver is registered */
3002 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3003 con_driver = &registered_con_driver[i];
3004
3005 if (con_driver->con == csw) {
3006 desc = con_driver->desc;
3007 retval = 0;
3008 break;
3009 }
3010 }
3011
3012 if (retval)
3013 goto err;
3014
3015 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3016 csw->con_startup();
3017 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3018 }
3019
3020 if (deflt) {
3021 if (conswitchp)
3022 module_put(conswitchp->owner);
3023
3024 __module_get(owner);
3025 conswitchp = csw;
3026 }
3027
3028 first = max(first, con_driver->first);
3029 last = min(last, con_driver->last);
3030
3031 for (i = first; i <= last; i++) {
3032 int old_was_color;
3033 struct vc_data *vc = vc_cons[i].d;
3034
3035 if (con_driver_map[i])
3036 module_put(con_driver_map[i]->owner);
3037 __module_get(owner);
3038 con_driver_map[i] = csw;
3039
3040 if (!vc || !vc->vc_sw)
3041 continue;
3042
3043 j = i;
3044
3045 if (CON_IS_VISIBLE(vc)) {
3046 k = i;
3047 save_screen(vc);
3048 }
3049
3050 old_was_color = vc->vc_can_do_color;
3051 vc->vc_sw->con_deinit(vc);
3052 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3053 visual_init(vc, i, 0);
3054 set_origin(vc);
3055 update_attr(vc);
3056
3057 /* If the console changed between mono <-> color, then
3058 * the attributes in the screenbuf will be wrong. The
3059 * following resets all attributes to something sane.
3060 */
3061 if (old_was_color != vc->vc_can_do_color)
3062 clear_buffer_attributes(vc);
3063 }
3064
3065 pr_info("Console: switching ");
3066 if (!deflt)
3067 printk("consoles %d-%d ", first+1, last+1);
3068 if (j >= 0) {
3069 struct vc_data *vc = vc_cons[j].d;
3070
3071 printk("to %s %s %dx%d\n",
3072 vc->vc_can_do_color ? "colour" : "mono",
3073 desc, vc->vc_cols, vc->vc_rows);
3074
3075 if (k >= 0) {
3076 vc = vc_cons[k].d;
3077 update_screen(vc);
3078 }
3079 } else
3080 printk("to %s\n", desc);
3081
3082 retval = 0;
3083 err:
3084 module_put(owner);
3085 return retval;
3086 };
3087
3088
3089 static int bind_con_driver(const struct consw *csw, int first, int last,
3090 int deflt)
3091 {
3092 int ret;
3093
3094 console_lock();
3095 ret = do_bind_con_driver(csw, first, last, deflt);
3096 console_unlock();
3097 return ret;
3098 }
3099
3100 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3101 static int con_is_graphics(const struct consw *csw, int first, int last)
3102 {
3103 int i, retval = 0;
3104
3105 for (i = first; i <= last; i++) {
3106 struct vc_data *vc = vc_cons[i].d;
3107
3108 if (vc && vc->vc_mode == KD_GRAPHICS) {
3109 retval = 1;
3110 break;
3111 }
3112 }
3113
3114 return retval;
3115 }
3116
3117 /**
3118 * unbind_con_driver - unbind a console driver
3119 * @csw: pointer to console driver to unregister
3120 * @first: first in range of consoles that @csw should be unbound from
3121 * @last: last in range of consoles that @csw should be unbound from
3122 * @deflt: should next bound console driver be default after @csw is unbound?
3123 *
3124 * To unbind a driver from all possible consoles, pass 0 as @first and
3125 * %MAX_NR_CONSOLES as @last.
3126 *
3127 * @deflt controls whether the console that ends up replacing @csw should be
3128 * the default console.
3129 *
3130 * RETURNS:
3131 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3132 * or 0 on success.
3133 */
3134 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3135 {
3136 int retval;
3137
3138 console_lock();
3139 retval = do_unbind_con_driver(csw, first, last, deflt);
3140 console_unlock();
3141 return retval;
3142 }
3143 EXPORT_SYMBOL(unbind_con_driver);
3144
3145 /* unlocked version of unbind_con_driver() */
3146 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3147 {
3148 struct module *owner = csw->owner;
3149 const struct consw *defcsw = NULL;
3150 struct con_driver *con_driver = NULL, *con_back = NULL;
3151 int i, retval = -ENODEV;
3152
3153 if (!try_module_get(owner))
3154 return -ENODEV;
3155
3156 WARN_CONSOLE_UNLOCKED();
3157
3158 /* check if driver is registered and if it is unbindable */
3159 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3160 con_driver = &registered_con_driver[i];
3161
3162 if (con_driver->con == csw &&
3163 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3164 retval = 0;
3165 break;
3166 }
3167 }
3168
3169 if (retval)
3170 goto err;
3171
3172 retval = -ENODEV;
3173
3174 /* check if backup driver exists */
3175 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3176 con_back = &registered_con_driver[i];
3177
3178 if (con_back->con &&
3179 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3180 defcsw = con_back->con;
3181 retval = 0;
3182 break;
3183 }
3184 }
3185
3186 if (retval)
3187 goto err;
3188
3189 if (!con_is_bound(csw))
3190 goto err;
3191
3192 first = max(first, con_driver->first);
3193 last = min(last, con_driver->last);
3194
3195 for (i = first; i <= last; i++) {
3196 if (con_driver_map[i] == csw) {
3197 module_put(csw->owner);
3198 con_driver_map[i] = NULL;
3199 }
3200 }
3201
3202 if (!con_is_bound(defcsw)) {
3203 const struct consw *defconsw = conswitchp;
3204
3205 defcsw->con_startup();
3206 con_back->flag |= CON_DRIVER_FLAG_INIT;
3207 /*
3208 * vgacon may change the default driver to point
3209 * to dummycon, we restore it here...
3210 */
3211 conswitchp = defconsw;
3212 }
3213
3214 if (!con_is_bound(csw))
3215 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3216
3217 /* ignore return value, binding should not fail */
3218 do_bind_con_driver(defcsw, first, last, deflt);
3219 err:
3220 module_put(owner);
3221 return retval;
3222
3223 }
3224 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3225
3226 static int vt_bind(struct con_driver *con)
3227 {
3228 const struct consw *defcsw = NULL, *csw = NULL;
3229 int i, more = 1, first = -1, last = -1, deflt = 0;
3230
3231 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3232 con_is_graphics(con->con, con->first, con->last))
3233 goto err;
3234
3235 csw = con->con;
3236
3237 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3238 struct con_driver *con = &registered_con_driver[i];
3239
3240 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3241 defcsw = con->con;
3242 break;
3243 }
3244 }
3245
3246 if (!defcsw)
3247 goto err;
3248
3249 while (more) {
3250 more = 0;
3251
3252 for (i = con->first; i <= con->last; i++) {
3253 if (con_driver_map[i] == defcsw) {
3254 if (first == -1)
3255 first = i;
3256 last = i;
3257 more = 1;
3258 } else if (first != -1)
3259 break;
3260 }
3261
3262 if (first == 0 && last == MAX_NR_CONSOLES -1)
3263 deflt = 1;
3264
3265 if (first != -1)
3266 bind_con_driver(csw, first, last, deflt);
3267
3268 first = -1;
3269 last = -1;
3270 deflt = 0;
3271 }
3272
3273 err:
3274 return 0;
3275 }
3276
3277 static int vt_unbind(struct con_driver *con)
3278 {
3279 const struct consw *csw = NULL;
3280 int i, more = 1, first = -1, last = -1, deflt = 0;
3281
3282 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3283 con_is_graphics(con->con, con->first, con->last))
3284 goto err;
3285
3286 csw = con->con;
3287
3288 while (more) {
3289 more = 0;
3290
3291 for (i = con->first; i <= con->last; i++) {
3292 if (con_driver_map[i] == csw) {
3293 if (first == -1)
3294 first = i;
3295 last = i;
3296 more = 1;
3297 } else if (first != -1)
3298 break;
3299 }
3300
3301 if (first == 0 && last == MAX_NR_CONSOLES -1)
3302 deflt = 1;
3303
3304 if (first != -1)
3305 unbind_con_driver(csw, first, last, deflt);
3306
3307 first = -1;
3308 last = -1;
3309 deflt = 0;
3310 }
3311
3312 err:
3313 return 0;
3314 }
3315 #else
3316 static inline int vt_bind(struct con_driver *con)
3317 {
3318 return 0;
3319 }
3320 static inline int vt_unbind(struct con_driver *con)
3321 {
3322 return 0;
3323 }
3324 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3325
3326 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3327 const char *buf, size_t count)
3328 {
3329 struct con_driver *con = dev_get_drvdata(dev);
3330 int bind = simple_strtoul(buf, NULL, 0);
3331
3332 if (bind)
3333 vt_bind(con);
3334 else
3335 vt_unbind(con);
3336
3337 return count;
3338 }
3339
3340 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3341 char *buf)
3342 {
3343 struct con_driver *con = dev_get_drvdata(dev);
3344 int bind = con_is_bound(con->con);
3345
3346 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3347 }
3348
3349 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3350 char *buf)
3351 {
3352 struct con_driver *con = dev_get_drvdata(dev);
3353
3354 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3355 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3356 con->desc);
3357
3358 }
3359
3360 static struct device_attribute device_attrs[] = {
3361 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3362 __ATTR(name, S_IRUGO, show_name, NULL),
3363 };
3364
3365 static int vtconsole_init_device(struct con_driver *con)
3366 {
3367 int i;
3368 int error = 0;
3369
3370 con->flag |= CON_DRIVER_FLAG_ATTR;
3371 dev_set_drvdata(con->dev, con);
3372 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3373 error = device_create_file(con->dev, &device_attrs[i]);
3374 if (error)
3375 break;
3376 }
3377
3378 if (error) {
3379 while (--i >= 0)
3380 device_remove_file(con->dev, &device_attrs[i]);
3381 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3382 }
3383
3384 return error;
3385 }
3386
3387 static void vtconsole_deinit_device(struct con_driver *con)
3388 {
3389 int i;
3390
3391 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3392 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3393 device_remove_file(con->dev, &device_attrs[i]);
3394 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3395 }
3396 }
3397
3398 /**
3399 * con_is_bound - checks if driver is bound to the console
3400 * @csw: console driver
3401 *
3402 * RETURNS: zero if unbound, nonzero if bound
3403 *
3404 * Drivers can call this and if zero, they should release
3405 * all resources allocated on con_startup()
3406 */
3407 int con_is_bound(const struct consw *csw)
3408 {
3409 int i, bound = 0;
3410
3411 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3412 if (con_driver_map[i] == csw) {
3413 bound = 1;
3414 break;
3415 }
3416 }
3417
3418 return bound;
3419 }
3420 EXPORT_SYMBOL(con_is_bound);
3421
3422 /**
3423 * con_debug_enter - prepare the console for the kernel debugger
3424 * @sw: console driver
3425 *
3426 * Called when the console is taken over by the kernel debugger, this
3427 * function needs to save the current console state, then put the console
3428 * into a state suitable for the kernel debugger.
3429 *
3430 * RETURNS:
3431 * Zero on success, nonzero if a failure occurred when trying to prepare
3432 * the console for the debugger.
3433 */
3434 int con_debug_enter(struct vc_data *vc)
3435 {
3436 int ret = 0;
3437
3438 saved_fg_console = fg_console;
3439 saved_last_console = last_console;
3440 saved_want_console = want_console;
3441 saved_vc_mode = vc->vc_mode;
3442 saved_console_blanked = console_blanked;
3443 vc->vc_mode = KD_TEXT;
3444 console_blanked = 0;
3445 if (vc->vc_sw->con_debug_enter)
3446 ret = vc->vc_sw->con_debug_enter(vc);
3447 #ifdef CONFIG_KGDB_KDB
3448 /* Set the initial LINES variable if it is not already set */
3449 if (vc->vc_rows < 999) {
3450 int linecount;
3451 char lns[4];
3452 const char *setargs[3] = {
3453 "set",
3454 "LINES",
3455 lns,
3456 };
3457 if (kdbgetintenv(setargs[0], &linecount)) {
3458 snprintf(lns, 4, "%i", vc->vc_rows);
3459 kdb_set(2, setargs);
3460 }
3461 }
3462 if (vc->vc_cols < 999) {
3463 int colcount;
3464 char cols[4];
3465 const char *setargs[3] = {
3466 "set",
3467 "COLUMNS",
3468 cols,
3469 };
3470 if (kdbgetintenv(setargs[0], &colcount)) {
3471 snprintf(cols, 4, "%i", vc->vc_cols);
3472 kdb_set(2, setargs);
3473 }
3474 }
3475 #endif /* CONFIG_KGDB_KDB */
3476 return ret;
3477 }
3478 EXPORT_SYMBOL_GPL(con_debug_enter);
3479
3480 /**
3481 * con_debug_leave - restore console state
3482 * @sw: console driver
3483 *
3484 * Restore the console state to what it was before the kernel debugger
3485 * was invoked.
3486 *
3487 * RETURNS:
3488 * Zero on success, nonzero if a failure occurred when trying to restore
3489 * the console.
3490 */
3491 int con_debug_leave(void)
3492 {
3493 struct vc_data *vc;
3494 int ret = 0;
3495
3496 fg_console = saved_fg_console;
3497 last_console = saved_last_console;
3498 want_console = saved_want_console;
3499 console_blanked = saved_console_blanked;
3500 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3501
3502 vc = vc_cons[fg_console].d;
3503 if (vc->vc_sw->con_debug_leave)
3504 ret = vc->vc_sw->con_debug_leave(vc);
3505 return ret;
3506 }
3507 EXPORT_SYMBOL_GPL(con_debug_leave);
3508
3509 static int do_register_con_driver(const struct consw *csw, int first, int last)
3510 {
3511 struct module *owner = csw->owner;
3512 struct con_driver *con_driver;
3513 const char *desc;
3514 int i, retval = 0;
3515
3516 WARN_CONSOLE_UNLOCKED();
3517
3518 if (!try_module_get(owner))
3519 return -ENODEV;
3520
3521 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3522 con_driver = &registered_con_driver[i];
3523
3524 /* already registered */
3525 if (con_driver->con == csw)
3526 retval = -EBUSY;
3527 }
3528
3529 if (retval)
3530 goto err;
3531
3532 desc = csw->con_startup();
3533
3534 if (!desc)
3535 goto err;
3536
3537 retval = -EINVAL;
3538
3539 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3540 con_driver = &registered_con_driver[i];
3541
3542 if (con_driver->con == NULL) {
3543 con_driver->con = csw;
3544 con_driver->desc = desc;
3545 con_driver->node = i;
3546 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3547 CON_DRIVER_FLAG_INIT;
3548 con_driver->first = first;
3549 con_driver->last = last;
3550 retval = 0;
3551 break;
3552 }
3553 }
3554
3555 if (retval)
3556 goto err;
3557
3558 con_driver->dev = device_create(vtconsole_class, NULL,
3559 MKDEV(0, con_driver->node),
3560 NULL, "vtcon%i",
3561 con_driver->node);
3562
3563 if (IS_ERR(con_driver->dev)) {
3564 printk(KERN_WARNING "Unable to create device for %s; "
3565 "errno = %ld\n", con_driver->desc,
3566 PTR_ERR(con_driver->dev));
3567 con_driver->dev = NULL;
3568 } else {
3569 vtconsole_init_device(con_driver);
3570 }
3571
3572 err:
3573 module_put(owner);
3574 return retval;
3575 }
3576
3577 /**
3578 * register_con_driver - register console driver to console layer
3579 * @csw: console driver
3580 * @first: the first console to take over, minimum value is 0
3581 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3582 *
3583 * DESCRIPTION: This function registers a console driver which can later
3584 * bind to a range of consoles specified by @first and @last. It will
3585 * also initialize the console driver by calling con_startup().
3586 */
3587 int register_con_driver(const struct consw *csw, int first, int last)
3588 {
3589 int retval;
3590
3591 console_lock();
3592 retval = do_register_con_driver(csw, first, last);
3593 console_unlock();
3594 return retval;
3595 }
3596 EXPORT_SYMBOL(register_con_driver);
3597
3598 /**
3599 * unregister_con_driver - unregister console driver from console layer
3600 * @csw: console driver
3601 *
3602 * DESCRIPTION: All drivers that registers to the console layer must
3603 * call this function upon exit, or if the console driver is in a state
3604 * where it won't be able to handle console services, such as the
3605 * framebuffer console without loaded framebuffer drivers.
3606 *
3607 * The driver must unbind first prior to unregistration.
3608 */
3609 int unregister_con_driver(const struct consw *csw)
3610 {
3611 int retval;
3612
3613 console_lock();
3614 retval = do_unregister_con_driver(csw);
3615 console_unlock();
3616 return retval;
3617 }
3618 EXPORT_SYMBOL(unregister_con_driver);
3619
3620 int do_unregister_con_driver(const struct consw *csw)
3621 {
3622 int i, retval = -ENODEV;
3623
3624 /* cannot unregister a bound driver */
3625 if (con_is_bound(csw))
3626 goto err;
3627
3628 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3629 struct con_driver *con_driver = &registered_con_driver[i];
3630
3631 if (con_driver->con == csw &&
3632 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3633 vtconsole_deinit_device(con_driver);
3634 device_destroy(vtconsole_class,
3635 MKDEV(0, con_driver->node));
3636 con_driver->con = NULL;
3637 con_driver->desc = NULL;
3638 con_driver->dev = NULL;
3639 con_driver->node = 0;
3640 con_driver->flag = 0;
3641 con_driver->first = 0;
3642 con_driver->last = 0;
3643 retval = 0;
3644 break;
3645 }
3646 }
3647 err:
3648 return retval;
3649 }
3650 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3651
3652 /*
3653 * If we support more console drivers, this function is used
3654 * when a driver wants to take over some existing consoles
3655 * and become default driver for newly opened ones.
3656 *
3657 * take_over_console is basically a register followed by unbind
3658 */
3659 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3660 {
3661 int err;
3662
3663 err = do_register_con_driver(csw, first, last);
3664 /*
3665 * If we get an busy error we still want to bind the console driver
3666 * and return success, as we may have unbound the console driver
3667 * but not unregistered it.
3668 */
3669 if (err == -EBUSY)
3670 err = 0;
3671 if (!err)
3672 do_bind_con_driver(csw, first, last, deflt);
3673
3674 return err;
3675 }
3676 EXPORT_SYMBOL_GPL(do_take_over_console);
3677
3678 /*
3679 * If we support more console drivers, this function is used
3680 * when a driver wants to take over some existing consoles
3681 * and become default driver for newly opened ones.
3682 *
3683 * take_over_console is basically a register followed by unbind
3684 */
3685 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3686 {
3687 int err;
3688
3689 err = register_con_driver(csw, first, last);
3690 /*
3691 * If we get an busy error we still want to bind the console driver
3692 * and return success, as we may have unbound the console driver
3693 * but not unregistered it.
3694 */
3695 if (err == -EBUSY)
3696 err = 0;
3697 if (!err)
3698 bind_con_driver(csw, first, last, deflt);
3699
3700 return err;
3701 }
3702
3703 /*
3704 * give_up_console is a wrapper to unregister_con_driver. It will only
3705 * work if driver is fully unbound.
3706 */
3707 void give_up_console(const struct consw *csw)
3708 {
3709 unregister_con_driver(csw);
3710 }
3711
3712 static int __init vtconsole_class_init(void)
3713 {
3714 int i;
3715
3716 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3717 if (IS_ERR(vtconsole_class)) {
3718 printk(KERN_WARNING "Unable to create vt console class; "
3719 "errno = %ld\n", PTR_ERR(vtconsole_class));
3720 vtconsole_class = NULL;
3721 }
3722
3723 /* Add system drivers to sysfs */
3724 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3725 struct con_driver *con = &registered_con_driver[i];
3726
3727 if (con->con && !con->dev) {
3728 con->dev = device_create(vtconsole_class, NULL,
3729 MKDEV(0, con->node),
3730 NULL, "vtcon%i",
3731 con->node);
3732
3733 if (IS_ERR(con->dev)) {
3734 printk(KERN_WARNING "Unable to create "
3735 "device for %s; errno = %ld\n",
3736 con->desc, PTR_ERR(con->dev));
3737 con->dev = NULL;
3738 } else {
3739 vtconsole_init_device(con);
3740 }
3741 }
3742 }
3743
3744 return 0;
3745 }
3746 postcore_initcall(vtconsole_class_init);
3747
3748 #endif
3749
3750 /*
3751 * Screen blanking
3752 */
3753
3754 static int set_vesa_blanking(char __user *p)
3755 {
3756 unsigned int mode;
3757
3758 if (get_user(mode, p + 1))
3759 return -EFAULT;
3760
3761 vesa_blank_mode = (mode < 4) ? mode : 0;
3762 return 0;
3763 }
3764
3765 void do_blank_screen(int entering_gfx)
3766 {
3767 struct vc_data *vc = vc_cons[fg_console].d;
3768 int i;
3769
3770 WARN_CONSOLE_UNLOCKED();
3771
3772 if (console_blanked) {
3773 if (blank_state == blank_vesa_wait) {
3774 blank_state = blank_off;
3775 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3776 }
3777 return;
3778 }
3779
3780 /* entering graphics mode? */
3781 if (entering_gfx) {
3782 hide_cursor(vc);
3783 save_screen(vc);
3784 vc->vc_sw->con_blank(vc, -1, 1);
3785 console_blanked = fg_console + 1;
3786 blank_state = blank_off;
3787 set_origin(vc);
3788 return;
3789 }
3790
3791 if (blank_state != blank_normal_wait)
3792 return;
3793 blank_state = blank_off;
3794
3795 /* don't blank graphics */
3796 if (vc->vc_mode != KD_TEXT) {
3797 console_blanked = fg_console + 1;
3798 return;
3799 }
3800
3801 hide_cursor(vc);
3802 del_timer_sync(&console_timer);
3803 blank_timer_expired = 0;
3804
3805 save_screen(vc);
3806 /* In case we need to reset origin, blanking hook returns 1 */
3807 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3808 console_blanked = fg_console + 1;
3809 if (i)
3810 set_origin(vc);
3811
3812 if (console_blank_hook && console_blank_hook(1))
3813 return;
3814
3815 if (vesa_off_interval && vesa_blank_mode) {
3816 blank_state = blank_vesa_wait;
3817 mod_timer(&console_timer, jiffies + vesa_off_interval);
3818 }
3819 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3820 }
3821 EXPORT_SYMBOL(do_blank_screen);
3822
3823 /*
3824 * Called by timer as well as from vt_console_driver
3825 */
3826 void do_unblank_screen(int leaving_gfx)
3827 {
3828 struct vc_data *vc;
3829
3830 /* This should now always be called from a "sane" (read: can schedule)
3831 * context for the sake of the low level drivers, except in the special
3832 * case of oops_in_progress
3833 */
3834 if (!oops_in_progress)
3835 might_sleep();
3836
3837 WARN_CONSOLE_UNLOCKED();
3838
3839 ignore_poke = 0;
3840 if (!console_blanked)
3841 return;
3842 if (!vc_cons_allocated(fg_console)) {
3843 /* impossible */
3844 pr_warning("unblank_screen: tty %d not allocated ??\n",
3845 fg_console+1);
3846 return;
3847 }
3848 vc = vc_cons[fg_console].d;
3849 /* Try to unblank in oops case too */
3850 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3851 return; /* but leave console_blanked != 0 */
3852
3853 if (blankinterval) {
3854 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3855 blank_state = blank_normal_wait;
3856 }
3857
3858 console_blanked = 0;
3859 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3860 /* Low-level driver cannot restore -> do it ourselves */
3861 update_screen(vc);
3862 if (console_blank_hook)
3863 console_blank_hook(0);
3864 set_palette(vc);
3865 set_cursor(vc);
3866 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3867 }
3868 EXPORT_SYMBOL(do_unblank_screen);
3869
3870 /*
3871 * This is called by the outside world to cause a forced unblank, mostly for
3872 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3873 * call it with 1 as an argument and so force a mode restore... that may kill
3874 * X or at least garbage the screen but would also make the Oops visible...
3875 */
3876 void unblank_screen(void)
3877 {
3878 do_unblank_screen(0);
3879 }
3880
3881 /*
3882 * We defer the timer blanking to work queue so it can take the console mutex
3883 * (console operations can still happen at irq time, but only from printk which
3884 * has the console mutex. Not perfect yet, but better than no locking
3885 */
3886 static void blank_screen_t(unsigned long dummy)
3887 {
3888 if (unlikely(!keventd_up())) {
3889 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3890 return;
3891 }
3892 blank_timer_expired = 1;
3893 schedule_work(&console_work);
3894 }
3895
3896 void poke_blanked_console(void)
3897 {
3898 WARN_CONSOLE_UNLOCKED();
3899
3900 /* Add this so we quickly catch whoever might call us in a non
3901 * safe context. Nowadays, unblank_screen() isn't to be called in
3902 * atomic contexts and is allowed to schedule (with the special case
3903 * of oops_in_progress, but that isn't of any concern for this
3904 * function. --BenH.
3905 */
3906 might_sleep();
3907
3908 /* This isn't perfectly race free, but a race here would be mostly harmless,
3909 * at worse, we'll do a spurrious blank and it's unlikely
3910 */
3911 del_timer(&console_timer);
3912 blank_timer_expired = 0;
3913
3914 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3915 return;
3916 if (console_blanked)
3917 unblank_screen();
3918 else if (blankinterval) {
3919 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3920 blank_state = blank_normal_wait;
3921 }
3922 }
3923
3924 /*
3925 * Palettes
3926 */
3927
3928 static void set_palette(struct vc_data *vc)
3929 {
3930 WARN_CONSOLE_UNLOCKED();
3931
3932 if (vc->vc_mode != KD_GRAPHICS)
3933 vc->vc_sw->con_set_palette(vc, color_table);
3934 }
3935
3936 /*
3937 * Load palette into the DAC registers. arg points to a colour
3938 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3939 */
3940
3941 int con_set_cmap(unsigned char __user *arg)
3942 {
3943 int i, j, k;
3944 unsigned char colormap[3*16];
3945
3946 if (copy_from_user(colormap, arg, sizeof(colormap)))
3947 return -EFAULT;
3948
3949 console_lock();
3950 for (i = k = 0; i < 16; i++) {
3951 default_red[i] = colormap[k++];
3952 default_grn[i] = colormap[k++];
3953 default_blu[i] = colormap[k++];
3954 }
3955 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3956 if (!vc_cons_allocated(i))
3957 continue;
3958 for (j = k = 0; j < 16; j++) {
3959 vc_cons[i].d->vc_palette[k++] = default_red[j];
3960 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3961 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3962 }
3963 set_palette(vc_cons[i].d);
3964 }
3965 console_unlock();
3966
3967 return 0;
3968 }
3969
3970 int con_get_cmap(unsigned char __user *arg)
3971 {
3972 int i, k;
3973 unsigned char colormap[3*16];
3974
3975 console_lock();
3976 for (i = k = 0; i < 16; i++) {
3977 colormap[k++] = default_red[i];
3978 colormap[k++] = default_grn[i];
3979 colormap[k++] = default_blu[i];
3980 }
3981 console_unlock();
3982
3983 if (copy_to_user(arg, colormap, sizeof(colormap)))
3984 return -EFAULT;
3985
3986 return 0;
3987 }
3988
3989 void reset_palette(struct vc_data *vc)
3990 {
3991 int j, k;
3992 for (j=k=0; j<16; j++) {
3993 vc->vc_palette[k++] = default_red[j];
3994 vc->vc_palette[k++] = default_grn[j];
3995 vc->vc_palette[k++] = default_blu[j];
3996 }
3997 set_palette(vc);
3998 }
3999
4000 /*
4001 * Font switching
4002 *
4003 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4004 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4005 * depending on width) reserved for each character which is kinda wasty, but
4006 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4007 * is up to the actual low-level console-driver convert data into its favorite
4008 * format (maybe we should add a `fontoffset' field to the `display'
4009 * structure so we won't have to convert the fontdata all the time.
4010 * /Jes
4011 */
4012
4013 #define max_font_size 65536
4014
4015 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4016 {
4017 struct console_font font;
4018 int rc = -EINVAL;
4019 int c;
4020
4021 if (op->data) {
4022 font.data = kmalloc(max_font_size, GFP_KERNEL);
4023 if (!font.data)
4024 return -ENOMEM;
4025 } else
4026 font.data = NULL;
4027
4028 console_lock();
4029 if (vc->vc_mode != KD_TEXT)
4030 rc = -EINVAL;
4031 else if (vc->vc_sw->con_font_get)
4032 rc = vc->vc_sw->con_font_get(vc, &font);
4033 else
4034 rc = -ENOSYS;
4035 console_unlock();
4036
4037 if (rc)
4038 goto out;
4039
4040 c = (font.width+7)/8 * 32 * font.charcount;
4041
4042 if (op->data && font.charcount > op->charcount)
4043 rc = -ENOSPC;
4044 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4045 if (font.width > op->width || font.height > op->height)
4046 rc = -ENOSPC;
4047 } else {
4048 if (font.width != 8)
4049 rc = -EIO;
4050 else if ((op->height && font.height > op->height) ||
4051 font.height > 32)
4052 rc = -ENOSPC;
4053 }
4054 if (rc)
4055 goto out;
4056
4057 op->height = font.height;
4058 op->width = font.width;
4059 op->charcount = font.charcount;
4060
4061 if (op->data && copy_to_user(op->data, font.data, c))
4062 rc = -EFAULT;
4063
4064 out:
4065 kfree(font.data);
4066 return rc;
4067 }
4068
4069 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4070 {
4071 struct console_font font;
4072 int rc = -EINVAL;
4073 int size;
4074
4075 if (vc->vc_mode != KD_TEXT)
4076 return -EINVAL;
4077 if (!op->data)
4078 return -EINVAL;
4079 if (op->charcount > 512)
4080 return -EINVAL;
4081 if (!op->height) { /* Need to guess font height [compat] */
4082 int h, i;
4083 u8 __user *charmap = op->data;
4084 u8 tmp;
4085
4086 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4087 so that we can get rid of this soon */
4088 if (!(op->flags & KD_FONT_FLAG_OLD))
4089 return -EINVAL;
4090 for (h = 32; h > 0; h--)
4091 for (i = 0; i < op->charcount; i++) {
4092 if (get_user(tmp, &charmap[32*i+h-1]))
4093 return -EFAULT;
4094 if (tmp)
4095 goto nonzero;
4096 }
4097 return -EINVAL;
4098 nonzero:
4099 op->height = h;
4100 }
4101 if (op->width <= 0 || op->width > 32 || op->height > 32)
4102 return -EINVAL;
4103 size = (op->width+7)/8 * 32 * op->charcount;
4104 if (size > max_font_size)
4105 return -ENOSPC;
4106 font.charcount = op->charcount;
4107 font.height = op->height;
4108 font.width = op->width;
4109 font.data = memdup_user(op->data, size);
4110 if (IS_ERR(font.data))
4111 return PTR_ERR(font.data);
4112 console_lock();
4113 if (vc->vc_mode != KD_TEXT)
4114 rc = -EINVAL;
4115 else if (vc->vc_sw->con_font_set)
4116 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4117 else
4118 rc = -ENOSYS;
4119 console_unlock();
4120 kfree(font.data);
4121 return rc;
4122 }
4123
4124 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4125 {
4126 struct console_font font = {.width = op->width, .height = op->height};
4127 char name[MAX_FONT_NAME];
4128 char *s = name;
4129 int rc;
4130
4131
4132 if (!op->data)
4133 s = NULL;
4134 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4135 return -EFAULT;
4136 else
4137 name[MAX_FONT_NAME - 1] = 0;
4138
4139 console_lock();
4140 if (vc->vc_mode != KD_TEXT) {
4141 console_unlock();
4142 return -EINVAL;
4143 }
4144 if (vc->vc_sw->con_font_default)
4145 rc = vc->vc_sw->con_font_default(vc, &font, s);
4146 else
4147 rc = -ENOSYS;
4148 console_unlock();
4149 if (!rc) {
4150 op->width = font.width;
4151 op->height = font.height;
4152 }
4153 return rc;
4154 }
4155
4156 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4157 {
4158 int con = op->height;
4159 int rc;
4160
4161
4162 console_lock();
4163 if (vc->vc_mode != KD_TEXT)
4164 rc = -EINVAL;
4165 else if (!vc->vc_sw->con_font_copy)
4166 rc = -ENOSYS;
4167 else if (con < 0 || !vc_cons_allocated(con))
4168 rc = -ENOTTY;
4169 else if (con == vc->vc_num) /* nothing to do */
4170 rc = 0;
4171 else
4172 rc = vc->vc_sw->con_font_copy(vc, con);
4173 console_unlock();
4174 return rc;
4175 }
4176
4177 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4178 {
4179 switch (op->op) {
4180 case KD_FONT_OP_SET:
4181 return con_font_set(vc, op);
4182 case KD_FONT_OP_GET:
4183 return con_font_get(vc, op);
4184 case KD_FONT_OP_SET_DEFAULT:
4185 return con_font_default(vc, op);
4186 case KD_FONT_OP_COPY:
4187 return con_font_copy(vc, op);
4188 }
4189 return -ENOSYS;
4190 }
4191
4192 /*
4193 * Interface exported to selection and vcs.
4194 */
4195
4196 /* used by selection */
4197 u16 screen_glyph(struct vc_data *vc, int offset)
4198 {
4199 u16 w = scr_readw(screenpos(vc, offset, 1));
4200 u16 c = w & 0xff;
4201
4202 if (w & vc->vc_hi_font_mask)
4203 c |= 0x100;
4204 return c;
4205 }
4206 EXPORT_SYMBOL_GPL(screen_glyph);
4207
4208 /* used by vcs - note the word offset */
4209 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4210 {
4211 return screenpos(vc, 2 * w_offset, viewed);
4212 }
4213
4214 void getconsxy(struct vc_data *vc, unsigned char *p)
4215 {
4216 p[0] = vc->vc_x;
4217 p[1] = vc->vc_y;
4218 }
4219
4220 void putconsxy(struct vc_data *vc, unsigned char *p)
4221 {
4222 hide_cursor(vc);
4223 gotoxy(vc, p[0], p[1]);
4224 set_cursor(vc);
4225 }
4226
4227 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4228 {
4229 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4230 return softcursor_original;
4231 return scr_readw(org);
4232 }
4233
4234 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4235 {
4236 scr_writew(val, org);
4237 if ((unsigned long)org == vc->vc_pos) {
4238 softcursor_original = -1;
4239 add_softcursor(vc);
4240 }
4241 }
4242
4243 void vcs_scr_updated(struct vc_data *vc)
4244 {
4245 notify_update(vc);
4246 }
4247
4248 /*
4249 * Visible symbols for modules
4250 */
4251
4252 EXPORT_SYMBOL(color_table);
4253 EXPORT_SYMBOL(default_red);
4254 EXPORT_SYMBOL(default_grn);
4255 EXPORT_SYMBOL(default_blu);
4256 EXPORT_SYMBOL(update_region);
4257 EXPORT_SYMBOL(redraw_screen);
4258 EXPORT_SYMBOL(vc_resize);
4259 EXPORT_SYMBOL(fg_console);
4260 EXPORT_SYMBOL(console_blank_hook);
4261 EXPORT_SYMBOL(console_blanked);
4262 EXPORT_SYMBOL(vc_cons);
4263 EXPORT_SYMBOL(global_cursor_default);
4264 #ifndef VT_SINGLE_DRIVER
4265 EXPORT_SYMBOL(take_over_console);
4266 EXPORT_SYMBOL(give_up_console);
4267 #endif
Linus' kernel tree