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bridge: fix a possible use after free
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / tty / vt / vt.c
blobb3915b7ad3e2facb654dbd50114623f01996f431
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 <asm/system.h>
103 #include <linux/uaccess.h>
104 #include <linux/kdb.h>
105 #include <linux/ctype.h>
106
107 #define MAX_NR_CON_DRIVER 16
108
109 #define CON_DRIVER_FLAG_MODULE 1
110 #define CON_DRIVER_FLAG_INIT 2
111 #define CON_DRIVER_FLAG_ATTR 4
112
113 struct con_driver {
114 const struct consw *con;
115 const char *desc;
116 struct device *dev;
117 int node;
118 int first;
119 int last;
120 int flag;
121 };
122
123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124 const struct consw *conswitchp;
125
126 /* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131 #define CTRL_ACTION 0x0d00ff81
132 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134 /*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137 #define DEFAULT_BELL_PITCH 750
138 #define DEFAULT_BELL_DURATION (HZ/8)
139
140 struct vc vc_cons [MAX_NR_CONSOLES];
141
142 #ifndef VT_SINGLE_DRIVER
143 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
144 #endif
145
146 static int con_open(struct tty_struct *, struct file *);
147 static void vc_init(struct vc_data *vc, unsigned int rows,
148 unsigned int cols, int do_clear);
149 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
150 static void save_cur(struct vc_data *vc);
151 static void reset_terminal(struct vc_data *vc, int do_clear);
152 static void con_flush_chars(struct tty_struct *tty);
153 static int set_vesa_blanking(char __user *p);
154 static void set_cursor(struct vc_data *vc);
155 static void hide_cursor(struct vc_data *vc);
156 static void console_callback(struct work_struct *ignored);
157 static void blank_screen_t(unsigned long dummy);
158 static void set_palette(struct vc_data *vc);
159
160 static int printable; /* Is console ready for printing? */
161 int default_utf8 = true;
162 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
163 int global_cursor_default = -1;
164 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
165
166 static int cur_default = CUR_DEFAULT;
167 module_param(cur_default, int, S_IRUGO | S_IWUSR);
168
169 /*
170 * ignore_poke: don't unblank the screen when things are typed. This is
171 * mainly for the privacy of braille terminal users.
172 */
173 static int ignore_poke;
174
175 int do_poke_blanked_console;
176 int console_blanked;
177
178 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
179 static int vesa_off_interval;
180 static int blankinterval = 10*60;
181 core_param(consoleblank, blankinterval, int, 0444);
182
183 static DECLARE_WORK(console_work, console_callback);
184
185 /*
186 * fg_console is the current virtual console,
187 * last_console is the last used one,
188 * want_console is the console we want to switch to,
189 * saved_* variants are for save/restore around kernel debugger enter/leave
190 */
191 int fg_console;
192 int last_console;
193 int want_console = -1;
194 static int saved_fg_console;
195 static int saved_last_console;
196 static int saved_want_console;
197 static int saved_vc_mode;
198 static int saved_console_blanked;
199
200 /*
201 * For each existing display, we have a pointer to console currently visible
202 * on that display, allowing consoles other than fg_console to be refreshed
203 * appropriately. Unless the low-level driver supplies its own display_fg
204 * variable, we use this one for the "master display".
205 */
206 static struct vc_data *master_display_fg;
207
208 /*
209 * Unfortunately, we need to delay tty echo when we're currently writing to the
210 * console since the code is (and always was) not re-entrant, so we schedule
211 * all flip requests to process context with schedule-task() and run it from
212 * console_callback().
213 */
214
215 /*
216 * For the same reason, we defer scrollback to the console callback.
217 */
218 static int scrollback_delta;
219
220 /*
221 * Hook so that the power management routines can (un)blank
222 * the console on our behalf.
223 */
224 int (*console_blank_hook)(int);
225
226 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
227 static int blank_state;
228 static int blank_timer_expired;
229 enum {
230 blank_off = 0,
231 blank_normal_wait,
232 blank_vesa_wait,
233 };
234
235 /*
236 * /sys/class/tty/tty0/
237 *
238 * the attribute 'active' contains the name of the current vc
239 * console and it supports poll() to detect vc switches
240 */
241 static struct device *tty0dev;
242
243 /*
244 * Notifier list for console events.
245 */
246 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
247
248 int register_vt_notifier(struct notifier_block *nb)
249 {
250 return atomic_notifier_chain_register(&vt_notifier_list, nb);
251 }
252 EXPORT_SYMBOL_GPL(register_vt_notifier);
253
254 int unregister_vt_notifier(struct notifier_block *nb)
255 {
256 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
257 }
258 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
259
260 static void notify_write(struct vc_data *vc, unsigned int unicode)
261 {
262 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
263 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
264 }
265
266 static void notify_update(struct vc_data *vc)
267 {
268 struct vt_notifier_param param = { .vc = vc };
269 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
270 }
271 /*
272 * Low-Level Functions
273 */
274
275 #define IS_FG(vc) ((vc)->vc_num == fg_console)
276
277 #ifdef VT_BUF_VRAM_ONLY
278 #define DO_UPDATE(vc) 0
279 #else
280 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
281 #endif
282
283 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
284 {
285 unsigned short *p;
286
287 if (!viewed)
288 p = (unsigned short *)(vc->vc_origin + offset);
289 else if (!vc->vc_sw->con_screen_pos)
290 p = (unsigned short *)(vc->vc_visible_origin + offset);
291 else
292 p = vc->vc_sw->con_screen_pos(vc, offset);
293 return p;
294 }
295
296 /* Called from the keyboard irq path.. */
297 static inline void scrolldelta(int lines)
298 {
299 /* FIXME */
300 /* scrolldelta needs some kind of consistency lock, but the BKL was
301 and still is not protecting versus the scheduled back end */
302 scrollback_delta += lines;
303 schedule_console_callback();
304 }
305
306 void schedule_console_callback(void)
307 {
308 schedule_work(&console_work);
309 }
310
311 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
312 {
313 unsigned short *d, *s;
314
315 if (t+nr >= b)
316 nr = b - t - 1;
317 if (b > vc->vc_rows || t >= b || nr < 1)
318 return;
319 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
320 return;
321 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
322 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
323 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
324 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
325 vc->vc_size_row * nr);
326 }
327
328 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
329 {
330 unsigned short *s;
331 unsigned int step;
332
333 if (t+nr >= b)
334 nr = b - t - 1;
335 if (b > vc->vc_rows || t >= b || nr < 1)
336 return;
337 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
338 return;
339 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
340 step = vc->vc_cols * nr;
341 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
342 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
343 }
344
345 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
346 {
347 #ifndef VT_BUF_VRAM_ONLY
348 unsigned int xx, yy, offset;
349 u16 *p;
350
351 p = (u16 *) start;
352 if (!vc->vc_sw->con_getxy) {
353 offset = (start - vc->vc_origin) / 2;
354 xx = offset % vc->vc_cols;
355 yy = offset / vc->vc_cols;
356 } else {
357 int nxx, nyy;
358 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
359 xx = nxx; yy = nyy;
360 }
361 for(;;) {
362 u16 attrib = scr_readw(p) & 0xff00;
363 int startx = xx;
364 u16 *q = p;
365 while (xx < vc->vc_cols && count) {
366 if (attrib != (scr_readw(p) & 0xff00)) {
367 if (p > q)
368 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
369 startx = xx;
370 q = p;
371 attrib = scr_readw(p) & 0xff00;
372 }
373 p++;
374 xx++;
375 count--;
376 }
377 if (p > q)
378 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
379 if (!count)
380 break;
381 xx = 0;
382 yy++;
383 if (vc->vc_sw->con_getxy) {
384 p = (u16 *)start;
385 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
386 }
387 }
388 #endif
389 }
390
391 void update_region(struct vc_data *vc, unsigned long start, int count)
392 {
393 WARN_CONSOLE_UNLOCKED();
394
395 if (DO_UPDATE(vc)) {
396 hide_cursor(vc);
397 do_update_region(vc, start, count);
398 set_cursor(vc);
399 }
400 }
401
402 /* Structure of attributes is hardware-dependent */
403
404 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
405 u8 _underline, u8 _reverse, u8 _italic)
406 {
407 if (vc->vc_sw->con_build_attr)
408 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
409 _blink, _underline, _reverse, _italic);
410
411 #ifndef VT_BUF_VRAM_ONLY
412 /*
413 * ++roman: I completely changed the attribute format for monochrome
414 * mode (!can_do_color). The formerly used MDA (monochrome display
415 * adapter) format didn't allow the combination of certain effects.
416 * Now the attribute is just a bit vector:
417 * Bit 0..1: intensity (0..2)
418 * Bit 2 : underline
419 * Bit 3 : reverse
420 * Bit 7 : blink
421 */
422 {
423 u8 a = _color;
424 if (!vc->vc_can_do_color)
425 return _intensity |
426 (_italic ? 2 : 0) |
427 (_underline ? 4 : 0) |
428 (_reverse ? 8 : 0) |
429 (_blink ? 0x80 : 0);
430 if (_italic)
431 a = (a & 0xF0) | vc->vc_itcolor;
432 else if (_underline)
433 a = (a & 0xf0) | vc->vc_ulcolor;
434 else if (_intensity == 0)
435 a = (a & 0xf0) | vc->vc_ulcolor;
436 if (_reverse)
437 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
438 if (_blink)
439 a ^= 0x80;
440 if (_intensity == 2)
441 a ^= 0x08;
442 if (vc->vc_hi_font_mask == 0x100)
443 a <<= 1;
444 return a;
445 }
446 #else
447 return 0;
448 #endif
449 }
450
451 static void update_attr(struct vc_data *vc)
452 {
453 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
454 vc->vc_blink, vc->vc_underline,
455 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
456 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
457 }
458
459 /* Note: inverting the screen twice should revert to the original state */
460 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
461 {
462 unsigned short *p;
463
464 WARN_CONSOLE_UNLOCKED();
465
466 count /= 2;
467 p = screenpos(vc, offset, viewed);
468 if (vc->vc_sw->con_invert_region)
469 vc->vc_sw->con_invert_region(vc, p, count);
470 #ifndef VT_BUF_VRAM_ONLY
471 else {
472 u16 *q = p;
473 int cnt = count;
474 u16 a;
475
476 if (!vc->vc_can_do_color) {
477 while (cnt--) {
478 a = scr_readw(q);
479 a ^= 0x0800;
480 scr_writew(a, q);
481 q++;
482 }
483 } else if (vc->vc_hi_font_mask == 0x100) {
484 while (cnt--) {
485 a = scr_readw(q);
486 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
487 scr_writew(a, q);
488 q++;
489 }
490 } else {
491 while (cnt--) {
492 a = scr_readw(q);
493 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
494 scr_writew(a, q);
495 q++;
496 }
497 }
498 }
499 #endif
500 if (DO_UPDATE(vc))
501 do_update_region(vc, (unsigned long) p, count);
502 }
503
504 /* used by selection: complement pointer position */
505 void complement_pos(struct vc_data *vc, int offset)
506 {
507 static int old_offset = -1;
508 static unsigned short old;
509 static unsigned short oldx, oldy;
510
511 WARN_CONSOLE_UNLOCKED();
512
513 if (old_offset != -1 && old_offset >= 0 &&
514 old_offset < vc->vc_screenbuf_size) {
515 scr_writew(old, screenpos(vc, old_offset, 1));
516 if (DO_UPDATE(vc))
517 vc->vc_sw->con_putc(vc, old, oldy, oldx);
518 }
519
520 old_offset = offset;
521
522 if (offset != -1 && offset >= 0 &&
523 offset < vc->vc_screenbuf_size) {
524 unsigned short new;
525 unsigned short *p;
526 p = screenpos(vc, offset, 1);
527 old = scr_readw(p);
528 new = old ^ vc->vc_complement_mask;
529 scr_writew(new, p);
530 if (DO_UPDATE(vc)) {
531 oldx = (offset >> 1) % vc->vc_cols;
532 oldy = (offset >> 1) / vc->vc_cols;
533 vc->vc_sw->con_putc(vc, new, oldy, oldx);
534 }
535 }
536
537 }
538
539 static void insert_char(struct vc_data *vc, unsigned int nr)
540 {
541 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
542
543 p = q + vc->vc_cols - nr - vc->vc_x;
544 while (--p >= q)
545 scr_writew(scr_readw(p), p + nr);
546 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
547 vc->vc_need_wrap = 0;
548 if (DO_UPDATE(vc)) {
549 unsigned short oldattr = vc->vc_attr;
550 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
551 vc->vc_cols - vc->vc_x - nr);
552 vc->vc_attr = vc->vc_video_erase_char >> 8;
553 while (nr--)
554 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
555 vc->vc_attr = oldattr;
556 }
557 }
558
559 static void delete_char(struct vc_data *vc, unsigned int nr)
560 {
561 unsigned int i = vc->vc_x;
562 unsigned short *p = (unsigned short *)vc->vc_pos;
563
564 while (++i <= vc->vc_cols - nr) {
565 scr_writew(scr_readw(p+nr), p);
566 p++;
567 }
568 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
569 vc->vc_need_wrap = 0;
570 if (DO_UPDATE(vc)) {
571 unsigned short oldattr = vc->vc_attr;
572 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
573 vc->vc_cols - vc->vc_x - nr);
574 vc->vc_attr = vc->vc_video_erase_char >> 8;
575 while (nr--)
576 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
577 vc->vc_cols - 1 - nr);
578 vc->vc_attr = oldattr;
579 }
580 }
581
582 static int softcursor_original;
583
584 static void add_softcursor(struct vc_data *vc)
585 {
586 int i = scr_readw((u16 *) vc->vc_pos);
587 u32 type = vc->vc_cursor_type;
588
589 if (! (type & 0x10)) return;
590 if (softcursor_original != -1) return;
591 softcursor_original = i;
592 i |= ((type >> 8) & 0xff00 );
593 i ^= ((type) & 0xff00 );
594 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
595 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
596 scr_writew(i, (u16 *) vc->vc_pos);
597 if (DO_UPDATE(vc))
598 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
599 }
600
601 static void hide_softcursor(struct vc_data *vc)
602 {
603 if (softcursor_original != -1) {
604 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
605 if (DO_UPDATE(vc))
606 vc->vc_sw->con_putc(vc, softcursor_original,
607 vc->vc_y, vc->vc_x);
608 softcursor_original = -1;
609 }
610 }
611
612 static void hide_cursor(struct vc_data *vc)
613 {
614 if (vc == sel_cons)
615 clear_selection();
616 vc->vc_sw->con_cursor(vc, CM_ERASE);
617 hide_softcursor(vc);
618 }
619
620 static void set_cursor(struct vc_data *vc)
621 {
622 if (!IS_FG(vc) || console_blanked ||
623 vc->vc_mode == KD_GRAPHICS)
624 return;
625 if (vc->vc_deccm) {
626 if (vc == sel_cons)
627 clear_selection();
628 add_softcursor(vc);
629 if ((vc->vc_cursor_type & 0x0f) != 1)
630 vc->vc_sw->con_cursor(vc, CM_DRAW);
631 } else
632 hide_cursor(vc);
633 }
634
635 static void set_origin(struct vc_data *vc)
636 {
637 WARN_CONSOLE_UNLOCKED();
638
639 if (!CON_IS_VISIBLE(vc) ||
640 !vc->vc_sw->con_set_origin ||
641 !vc->vc_sw->con_set_origin(vc))
642 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
643 vc->vc_visible_origin = vc->vc_origin;
644 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
645 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
646 }
647
648 static inline void save_screen(struct vc_data *vc)
649 {
650 WARN_CONSOLE_UNLOCKED();
651
652 if (vc->vc_sw->con_save_screen)
653 vc->vc_sw->con_save_screen(vc);
654 }
655
656 /*
657 * Redrawing of screen
658 */
659
660 static void clear_buffer_attributes(struct vc_data *vc)
661 {
662 unsigned short *p = (unsigned short *)vc->vc_origin;
663 int count = vc->vc_screenbuf_size / 2;
664 int mask = vc->vc_hi_font_mask | 0xff;
665
666 for (; count > 0; count--, p++) {
667 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
668 }
669 }
670
671 void redraw_screen(struct vc_data *vc, int is_switch)
672 {
673 int redraw = 0;
674
675 WARN_CONSOLE_UNLOCKED();
676
677 if (!vc) {
678 /* strange ... */
679 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
680 return;
681 }
682
683 if (is_switch) {
684 struct vc_data *old_vc = vc_cons[fg_console].d;
685 if (old_vc == vc)
686 return;
687 if (!CON_IS_VISIBLE(vc))
688 redraw = 1;
689 *vc->vc_display_fg = vc;
690 fg_console = vc->vc_num;
691 hide_cursor(old_vc);
692 if (!CON_IS_VISIBLE(old_vc)) {
693 save_screen(old_vc);
694 set_origin(old_vc);
695 }
696 if (tty0dev)
697 sysfs_notify(&tty0dev->kobj, NULL, "active");
698 } else {
699 hide_cursor(vc);
700 redraw = 1;
701 }
702
703 if (redraw) {
704 int update;
705 int old_was_color = vc->vc_can_do_color;
706
707 set_origin(vc);
708 update = vc->vc_sw->con_switch(vc);
709 set_palette(vc);
710 /*
711 * If console changed from mono<->color, the best we can do
712 * is to clear the buffer attributes. As it currently stands,
713 * rebuilding new attributes from the old buffer is not doable
714 * without overly complex code.
715 */
716 if (old_was_color != vc->vc_can_do_color) {
717 update_attr(vc);
718 clear_buffer_attributes(vc);
719 }
720
721 /* Forcibly update if we're panicing */
722 if ((update && vc->vc_mode != KD_GRAPHICS) ||
723 vt_force_oops_output(vc))
724 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
725 }
726 set_cursor(vc);
727 if (is_switch) {
728 set_leds();
729 compute_shiftstate();
730 notify_update(vc);
731 }
732 }
733
734 /*
735 * Allocation, freeing and resizing of VTs.
736 */
737
738 int vc_cons_allocated(unsigned int i)
739 {
740 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
741 }
742
743 static void visual_init(struct vc_data *vc, int num, int init)
744 {
745 /* ++Geert: vc->vc_sw->con_init determines console size */
746 if (vc->vc_sw)
747 module_put(vc->vc_sw->owner);
748 vc->vc_sw = conswitchp;
749 #ifndef VT_SINGLE_DRIVER
750 if (con_driver_map[num])
751 vc->vc_sw = con_driver_map[num];
752 #endif
753 __module_get(vc->vc_sw->owner);
754 vc->vc_num = num;
755 vc->vc_display_fg = &master_display_fg;
756 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
757 vc->vc_uni_pagedir = 0;
758 vc->vc_hi_font_mask = 0;
759 vc->vc_complement_mask = 0;
760 vc->vc_can_do_color = 0;
761 vc->vc_panic_force_write = false;
762 vc->vc_sw->con_init(vc, init);
763 if (!vc->vc_complement_mask)
764 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
765 vc->vc_s_complement_mask = vc->vc_complement_mask;
766 vc->vc_size_row = vc->vc_cols << 1;
767 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
768 }
769
770 int vc_allocate(unsigned int currcons) /* return 0 on success */
771 {
772 WARN_CONSOLE_UNLOCKED();
773
774 if (currcons >= MAX_NR_CONSOLES)
775 return -ENXIO;
776 if (!vc_cons[currcons].d) {
777 struct vc_data *vc;
778 struct vt_notifier_param param;
779
780 /* prevent users from taking too much memory */
781 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
782 return -EPERM;
783
784 /* due to the granularity of kmalloc, we waste some memory here */
785 /* the alloc is done in two steps, to optimize the common situation
786 of a 25x80 console (structsize=216, screenbuf_size=4000) */
787 /* although the numbers above are not valid since long ago, the
788 point is still up-to-date and the comment still has its value
789 even if only as a historical artifact. --mj, July 1998 */
790 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
791 if (!vc)
792 return -ENOMEM;
793 vc_cons[currcons].d = vc;
794 tty_port_init(&vc->port);
795 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
796 visual_init(vc, currcons, 1);
797 if (!*vc->vc_uni_pagedir_loc)
798 con_set_default_unimap(vc);
799 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
800 if (!vc->vc_screenbuf) {
801 kfree(vc);
802 vc_cons[currcons].d = NULL;
803 return -ENOMEM;
804 }
805
806 /* If no drivers have overridden us and the user didn't pass a
807 boot option, default to displaying the cursor */
808 if (global_cursor_default == -1)
809 global_cursor_default = 1;
810
811 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
812 vcs_make_sysfs(currcons);
813 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
814 }
815 return 0;
816 }
817
818 static inline int resize_screen(struct vc_data *vc, int width, int height,
819 int user)
820 {
821 /* Resizes the resolution of the display adapater */
822 int err = 0;
823
824 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
825 err = vc->vc_sw->con_resize(vc, width, height, user);
826
827 return err;
828 }
829
830 /*
831 * Change # of rows and columns (0 means unchanged/the size of fg_console)
832 * [this is to be used together with some user program
833 * like resize that changes the hardware videomode]
834 */
835 #define VC_RESIZE_MAXCOL (32767)
836 #define VC_RESIZE_MAXROW (32767)
837
838 /**
839 * vc_do_resize - resizing method for the tty
840 * @tty: tty being resized
841 * @real_tty: real tty (different to tty if a pty/tty pair)
842 * @vc: virtual console private data
843 * @cols: columns
844 * @lines: lines
845 *
846 * Resize a virtual console, clipping according to the actual constraints.
847 * If the caller passes a tty structure then update the termios winsize
848 * information and perform any necessary signal handling.
849 *
850 * Caller must hold the console semaphore. Takes the termios mutex and
851 * ctrl_lock of the tty IFF a tty is passed.
852 */
853
854 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
855 unsigned int cols, unsigned int lines)
856 {
857 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
858 unsigned long end;
859 unsigned int old_rows, old_row_size;
860 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
861 unsigned int user;
862 unsigned short *newscreen;
863
864 WARN_CONSOLE_UNLOCKED();
865
866 if (!vc)
867 return -ENXIO;
868
869 user = vc->vc_resize_user;
870 vc->vc_resize_user = 0;
871
872 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
873 return -EINVAL;
874
875 new_cols = (cols ? cols : vc->vc_cols);
876 new_rows = (lines ? lines : vc->vc_rows);
877 new_row_size = new_cols << 1;
878 new_screen_size = new_row_size * new_rows;
879
880 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
881 return 0;
882
883 newscreen = kmalloc(new_screen_size, GFP_USER);
884 if (!newscreen)
885 return -ENOMEM;
886
887 old_rows = vc->vc_rows;
888 old_row_size = vc->vc_size_row;
889
890 err = resize_screen(vc, new_cols, new_rows, user);
891 if (err) {
892 kfree(newscreen);
893 return err;
894 }
895
896 vc->vc_rows = new_rows;
897 vc->vc_cols = new_cols;
898 vc->vc_size_row = new_row_size;
899 vc->vc_screenbuf_size = new_screen_size;
900
901 rlth = min(old_row_size, new_row_size);
902 rrem = new_row_size - rlth;
903 old_origin = vc->vc_origin;
904 new_origin = (long) newscreen;
905 new_scr_end = new_origin + new_screen_size;
906
907 if (vc->vc_y > new_rows) {
908 if (old_rows - vc->vc_y < new_rows) {
909 /*
910 * Cursor near the bottom, copy contents from the
911 * bottom of buffer
912 */
913 old_origin += (old_rows - new_rows) * old_row_size;
914 } else {
915 /*
916 * Cursor is in no man's land, copy 1/2 screenful
917 * from the top and bottom of cursor position
918 */
919 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
920 }
921 }
922
923 end = old_origin + old_row_size * min(old_rows, new_rows);
924
925 update_attr(vc);
926
927 while (old_origin < end) {
928 scr_memcpyw((unsigned short *) new_origin,
929 (unsigned short *) old_origin, rlth);
930 if (rrem)
931 scr_memsetw((void *)(new_origin + rlth),
932 vc->vc_video_erase_char, rrem);
933 old_origin += old_row_size;
934 new_origin += new_row_size;
935 }
936 if (new_scr_end > new_origin)
937 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
938 new_scr_end - new_origin);
939 kfree(vc->vc_screenbuf);
940 vc->vc_screenbuf = newscreen;
941 vc->vc_screenbuf_size = new_screen_size;
942 set_origin(vc);
943
944 /* do part of a reset_terminal() */
945 vc->vc_top = 0;
946 vc->vc_bottom = vc->vc_rows;
947 gotoxy(vc, vc->vc_x, vc->vc_y);
948 save_cur(vc);
949
950 if (tty) {
951 /* Rewrite the requested winsize data with the actual
952 resulting sizes */
953 struct winsize ws;
954 memset(&ws, 0, sizeof(ws));
955 ws.ws_row = vc->vc_rows;
956 ws.ws_col = vc->vc_cols;
957 ws.ws_ypixel = vc->vc_scan_lines;
958 tty_do_resize(tty, &ws);
959 }
960
961 if (CON_IS_VISIBLE(vc))
962 update_screen(vc);
963 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
964 return err;
965 }
966
967 /**
968 * vc_resize - resize a VT
969 * @vc: virtual console
970 * @cols: columns
971 * @rows: rows
972 *
973 * Resize a virtual console as seen from the console end of things. We
974 * use the common vc_do_resize methods to update the structures. The
975 * caller must hold the console sem to protect console internals and
976 * vc->port.tty
977 */
978
979 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
980 {
981 return vc_do_resize(vc->port.tty, vc, cols, rows);
982 }
983
984 /**
985 * vt_resize - resize a VT
986 * @tty: tty to resize
987 * @ws: winsize attributes
988 *
989 * Resize a virtual terminal. This is called by the tty layer as we
990 * register our own handler for resizing. The mutual helper does all
991 * the actual work.
992 *
993 * Takes the console sem and the called methods then take the tty
994 * termios_mutex and the tty ctrl_lock in that order.
995 */
996 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
997 {
998 struct vc_data *vc = tty->driver_data;
999 int ret;
1000
1001 console_lock();
1002 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1003 console_unlock();
1004 return ret;
1005 }
1006
1007 void vc_deallocate(unsigned int currcons)
1008 {
1009 WARN_CONSOLE_UNLOCKED();
1010
1011 if (vc_cons_allocated(currcons)) {
1012 struct vc_data *vc = vc_cons[currcons].d;
1013 struct vt_notifier_param param = { .vc = vc };
1014
1015 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1016 vcs_remove_sysfs(currcons);
1017 vc->vc_sw->con_deinit(vc);
1018 put_pid(vc->vt_pid);
1019 module_put(vc->vc_sw->owner);
1020 kfree(vc->vc_screenbuf);
1021 if (currcons >= MIN_NR_CONSOLES)
1022 kfree(vc);
1023 vc_cons[currcons].d = NULL;
1024 }
1025 }
1026
1027 /*
1028 * VT102 emulator
1029 */
1030
1031 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1032 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1033 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1034
1035 #define decarm VC_REPEAT
1036 #define decckm VC_CKMODE
1037 #define kbdapplic VC_APPLIC
1038 #define lnm VC_CRLF
1039
1040 /*
1041 * this is what the terminal answers to a ESC-Z or csi0c query.
1042 */
1043 #define VT100ID "\033[?1;2c"
1044 #define VT102ID "\033[?6c"
1045
1046 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1047 8,12,10,14, 9,13,11,15 };
1048
1049 /* the default colour table, for VGA+ colour systems */
1050 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1051 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1052 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1053 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1054 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1055 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1056
1057 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1058 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1059 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1060
1061 /*
1062 * gotoxy() must verify all boundaries, because the arguments
1063 * might also be negative. If the given position is out of
1064 * bounds, the cursor is placed at the nearest margin.
1065 */
1066 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1067 {
1068 int min_y, max_y;
1069
1070 if (new_x < 0)
1071 vc->vc_x = 0;
1072 else {
1073 if (new_x >= vc->vc_cols)
1074 vc->vc_x = vc->vc_cols - 1;
1075 else
1076 vc->vc_x = new_x;
1077 }
1078
1079 if (vc->vc_decom) {
1080 min_y = vc->vc_top;
1081 max_y = vc->vc_bottom;
1082 } else {
1083 min_y = 0;
1084 max_y = vc->vc_rows;
1085 }
1086 if (new_y < min_y)
1087 vc->vc_y = min_y;
1088 else if (new_y >= max_y)
1089 vc->vc_y = max_y - 1;
1090 else
1091 vc->vc_y = new_y;
1092 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1093 vc->vc_need_wrap = 0;
1094 }
1095
1096 /* for absolute user moves, when decom is set */
1097 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1098 {
1099 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1100 }
1101
1102 void scrollback(struct vc_data *vc, int lines)
1103 {
1104 if (!lines)
1105 lines = vc->vc_rows / 2;
1106 scrolldelta(-lines);
1107 }
1108
1109 void scrollfront(struct vc_data *vc, int lines)
1110 {
1111 if (!lines)
1112 lines = vc->vc_rows / 2;
1113 scrolldelta(lines);
1114 }
1115
1116 static void lf(struct vc_data *vc)
1117 {
1118 /* don't scroll if above bottom of scrolling region, or
1119 * if below scrolling region
1120 */
1121 if (vc->vc_y + 1 == vc->vc_bottom)
1122 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1123 else if (vc->vc_y < vc->vc_rows - 1) {
1124 vc->vc_y++;
1125 vc->vc_pos += vc->vc_size_row;
1126 }
1127 vc->vc_need_wrap = 0;
1128 notify_write(vc, '\n');
1129 }
1130
1131 static void ri(struct vc_data *vc)
1132 {
1133 /* don't scroll if below top of scrolling region, or
1134 * if above scrolling region
1135 */
1136 if (vc->vc_y == vc->vc_top)
1137 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1138 else if (vc->vc_y > 0) {
1139 vc->vc_y--;
1140 vc->vc_pos -= vc->vc_size_row;
1141 }
1142 vc->vc_need_wrap = 0;
1143 }
1144
1145 static inline void cr(struct vc_data *vc)
1146 {
1147 vc->vc_pos -= vc->vc_x << 1;
1148 vc->vc_need_wrap = vc->vc_x = 0;
1149 notify_write(vc, '\r');
1150 }
1151
1152 static inline void bs(struct vc_data *vc)
1153 {
1154 if (vc->vc_x) {
1155 vc->vc_pos -= 2;
1156 vc->vc_x--;
1157 vc->vc_need_wrap = 0;
1158 notify_write(vc, '\b');
1159 }
1160 }
1161
1162 static inline void del(struct vc_data *vc)
1163 {
1164 /* ignored */
1165 }
1166
1167 static void csi_J(struct vc_data *vc, int vpar)
1168 {
1169 unsigned int count;
1170 unsigned short * start;
1171
1172 switch (vpar) {
1173 case 0: /* erase from cursor to end of display */
1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1175 start = (unsigned short *)vc->vc_pos;
1176 if (DO_UPDATE(vc)) {
1177 /* do in two stages */
1178 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1179 vc->vc_cols - vc->vc_x);
1180 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1181 vc->vc_rows - vc->vc_y - 1,
1182 vc->vc_cols);
1183 }
1184 break;
1185 case 1: /* erase from start to cursor */
1186 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1187 start = (unsigned short *)vc->vc_origin;
1188 if (DO_UPDATE(vc)) {
1189 /* do in two stages */
1190 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1191 vc->vc_cols);
1192 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1193 vc->vc_x + 1);
1194 }
1195 break;
1196 case 3: /* erase scroll-back buffer (and whole display) */
1197 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1198 vc->vc_screenbuf_size >> 1);
1199 set_origin(vc);
1200 if (CON_IS_VISIBLE(vc))
1201 update_screen(vc);
1202 /* fall through */
1203 case 2: /* erase whole display */
1204 count = vc->vc_cols * vc->vc_rows;
1205 start = (unsigned short *)vc->vc_origin;
1206 if (DO_UPDATE(vc))
1207 vc->vc_sw->con_clear(vc, 0, 0,
1208 vc->vc_rows,
1209 vc->vc_cols);
1210 break;
1211 default:
1212 return;
1213 }
1214 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1215 vc->vc_need_wrap = 0;
1216 }
1217
1218 static void csi_K(struct vc_data *vc, int vpar)
1219 {
1220 unsigned int count;
1221 unsigned short * start;
1222
1223 switch (vpar) {
1224 case 0: /* erase from cursor to end of line */
1225 count = vc->vc_cols - vc->vc_x;
1226 start = (unsigned short *)vc->vc_pos;
1227 if (DO_UPDATE(vc))
1228 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1229 vc->vc_cols - vc->vc_x);
1230 break;
1231 case 1: /* erase from start of line to cursor */
1232 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1233 count = vc->vc_x + 1;
1234 if (DO_UPDATE(vc))
1235 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1236 vc->vc_x + 1);
1237 break;
1238 case 2: /* erase whole line */
1239 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1240 count = vc->vc_cols;
1241 if (DO_UPDATE(vc))
1242 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1243 vc->vc_cols);
1244 break;
1245 default:
1246 return;
1247 }
1248 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1249 vc->vc_need_wrap = 0;
1250 }
1251
1252 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1253 { /* not vt100? */
1254 int count;
1255
1256 if (!vpar)
1257 vpar++;
1258 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1259
1260 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1261 if (DO_UPDATE(vc))
1262 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1263 vc->vc_need_wrap = 0;
1264 }
1265
1266 static void default_attr(struct vc_data *vc)
1267 {
1268 vc->vc_intensity = 1;
1269 vc->vc_italic = 0;
1270 vc->vc_underline = 0;
1271 vc->vc_reverse = 0;
1272 vc->vc_blink = 0;
1273 vc->vc_color = vc->vc_def_color;
1274 }
1275
1276 /* console_lock is held */
1277 static void csi_m(struct vc_data *vc)
1278 {
1279 int i;
1280
1281 for (i = 0; i <= vc->vc_npar; i++)
1282 switch (vc->vc_par[i]) {
1283 case 0: /* all attributes off */
1284 default_attr(vc);
1285 break;
1286 case 1:
1287 vc->vc_intensity = 2;
1288 break;
1289 case 2:
1290 vc->vc_intensity = 0;
1291 break;
1292 case 3:
1293 vc->vc_italic = 1;
1294 break;
1295 case 4:
1296 vc->vc_underline = 1;
1297 break;
1298 case 5:
1299 vc->vc_blink = 1;
1300 break;
1301 case 7:
1302 vc->vc_reverse = 1;
1303 break;
1304 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1305 * Select primary font, don't display
1306 * control chars if defined, don't set
1307 * bit 8 on output.
1308 */
1309 vc->vc_translate = set_translate(vc->vc_charset == 0
1310 ? vc->vc_G0_charset
1311 : vc->vc_G1_charset, vc);
1312 vc->vc_disp_ctrl = 0;
1313 vc->vc_toggle_meta = 0;
1314 break;
1315 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1316 * Select first alternate font, lets
1317 * chars < 32 be displayed as ROM chars.
1318 */
1319 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1320 vc->vc_disp_ctrl = 1;
1321 vc->vc_toggle_meta = 0;
1322 break;
1323 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Select second alternate font, toggle
1325 * high bit before displaying as ROM char.
1326 */
1327 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1328 vc->vc_disp_ctrl = 1;
1329 vc->vc_toggle_meta = 1;
1330 break;
1331 case 21:
1332 case 22:
1333 vc->vc_intensity = 1;
1334 break;
1335 case 23:
1336 vc->vc_italic = 0;
1337 break;
1338 case 24:
1339 vc->vc_underline = 0;
1340 break;
1341 case 25:
1342 vc->vc_blink = 0;
1343 break;
1344 case 27:
1345 vc->vc_reverse = 0;
1346 break;
1347 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1348 * Enables underscore, white foreground
1349 * with white underscore (Linux - use
1350 * default foreground).
1351 */
1352 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1353 vc->vc_underline = 1;
1354 break;
1355 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1356 * Disable underline option.
1357 * Reset colour to default? It did this
1358 * before...
1359 */
1360 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1361 vc->vc_underline = 0;
1362 break;
1363 case 49:
1364 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1365 break;
1366 default:
1367 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1368 vc->vc_color = color_table[vc->vc_par[i] - 30]
1369 | (vc->vc_color & 0xf0);
1370 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1371 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1372 | (vc->vc_color & 0x0f);
1373 break;
1374 }
1375 update_attr(vc);
1376 }
1377
1378 static void respond_string(const char *p, struct tty_struct *tty)
1379 {
1380 while (*p) {
1381 tty_insert_flip_char(tty, *p, 0);
1382 p++;
1383 }
1384 con_schedule_flip(tty);
1385 }
1386
1387 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1388 {
1389 char buf[40];
1390
1391 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1392 respond_string(buf, tty);
1393 }
1394
1395 static inline void status_report(struct tty_struct *tty)
1396 {
1397 respond_string("\033[0n", tty); /* Terminal ok */
1398 }
1399
1400 static inline void respond_ID(struct tty_struct * tty)
1401 {
1402 respond_string(VT102ID, tty);
1403 }
1404
1405 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1406 {
1407 char buf[8];
1408
1409 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1410 (char)('!' + mry));
1411 respond_string(buf, tty);
1412 }
1413
1414 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1415 int mouse_reporting(void)
1416 {
1417 return vc_cons[fg_console].d->vc_report_mouse;
1418 }
1419
1420 /* console_lock is held */
1421 static void set_mode(struct vc_data *vc, int on_off)
1422 {
1423 int i;
1424
1425 for (i = 0; i <= vc->vc_npar; i++)
1426 if (vc->vc_ques) {
1427 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1428 case 1: /* Cursor keys send ^[Ox/^[[x */
1429 if (on_off)
1430 set_kbd(vc, decckm);
1431 else
1432 clr_kbd(vc, decckm);
1433 break;
1434 case 3: /* 80/132 mode switch unimplemented */
1435 vc->vc_deccolm = on_off;
1436 #if 0
1437 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1438 /* this alone does not suffice; some user mode
1439 utility has to change the hardware regs */
1440 #endif
1441 break;
1442 case 5: /* Inverted screen on/off */
1443 if (vc->vc_decscnm != on_off) {
1444 vc->vc_decscnm = on_off;
1445 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1446 update_attr(vc);
1447 }
1448 break;
1449 case 6: /* Origin relative/absolute */
1450 vc->vc_decom = on_off;
1451 gotoxay(vc, 0, 0);
1452 break;
1453 case 7: /* Autowrap on/off */
1454 vc->vc_decawm = on_off;
1455 break;
1456 case 8: /* Autorepeat on/off */
1457 if (on_off)
1458 set_kbd(vc, decarm);
1459 else
1460 clr_kbd(vc, decarm);
1461 break;
1462 case 9:
1463 vc->vc_report_mouse = on_off ? 1 : 0;
1464 break;
1465 case 25: /* Cursor on/off */
1466 vc->vc_deccm = on_off;
1467 break;
1468 case 1000:
1469 vc->vc_report_mouse = on_off ? 2 : 0;
1470 break;
1471 }
1472 } else {
1473 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1474 case 3: /* Monitor (display ctrls) */
1475 vc->vc_disp_ctrl = on_off;
1476 break;
1477 case 4: /* Insert Mode on/off */
1478 vc->vc_decim = on_off;
1479 break;
1480 case 20: /* Lf, Enter == CrLf/Lf */
1481 if (on_off)
1482 set_kbd(vc, lnm);
1483 else
1484 clr_kbd(vc, lnm);
1485 break;
1486 }
1487 }
1488 }
1489
1490 /* console_lock is held */
1491 static void setterm_command(struct vc_data *vc)
1492 {
1493 switch(vc->vc_par[0]) {
1494 case 1: /* set color for underline mode */
1495 if (vc->vc_can_do_color &&
1496 vc->vc_par[1] < 16) {
1497 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1498 if (vc->vc_underline)
1499 update_attr(vc);
1500 }
1501 break;
1502 case 2: /* set color for half intensity mode */
1503 if (vc->vc_can_do_color &&
1504 vc->vc_par[1] < 16) {
1505 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1506 if (vc->vc_intensity == 0)
1507 update_attr(vc);
1508 }
1509 break;
1510 case 8: /* store colors as defaults */
1511 vc->vc_def_color = vc->vc_attr;
1512 if (vc->vc_hi_font_mask == 0x100)
1513 vc->vc_def_color >>= 1;
1514 default_attr(vc);
1515 update_attr(vc);
1516 break;
1517 case 9: /* set blanking interval */
1518 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1519 poke_blanked_console();
1520 break;
1521 case 10: /* set bell frequency in Hz */
1522 if (vc->vc_npar >= 1)
1523 vc->vc_bell_pitch = vc->vc_par[1];
1524 else
1525 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1526 break;
1527 case 11: /* set bell duration in msec */
1528 if (vc->vc_npar >= 1)
1529 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1530 vc->vc_par[1] * HZ / 1000 : 0;
1531 else
1532 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1533 break;
1534 case 12: /* bring specified console to the front */
1535 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1536 set_console(vc->vc_par[1] - 1);
1537 break;
1538 case 13: /* unblank the screen */
1539 poke_blanked_console();
1540 break;
1541 case 14: /* set vesa powerdown interval */
1542 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1543 break;
1544 case 15: /* activate the previous console */
1545 set_console(last_console);
1546 break;
1547 }
1548 }
1549
1550 /* console_lock is held */
1551 static void csi_at(struct vc_data *vc, unsigned int nr)
1552 {
1553 if (nr > vc->vc_cols - vc->vc_x)
1554 nr = vc->vc_cols - vc->vc_x;
1555 else if (!nr)
1556 nr = 1;
1557 insert_char(vc, nr);
1558 }
1559
1560 /* console_lock is held */
1561 static void csi_L(struct vc_data *vc, unsigned int nr)
1562 {
1563 if (nr > vc->vc_rows - vc->vc_y)
1564 nr = vc->vc_rows - vc->vc_y;
1565 else if (!nr)
1566 nr = 1;
1567 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1568 vc->vc_need_wrap = 0;
1569 }
1570
1571 /* console_lock is held */
1572 static void csi_P(struct vc_data *vc, unsigned int nr)
1573 {
1574 if (nr > vc->vc_cols - vc->vc_x)
1575 nr = vc->vc_cols - vc->vc_x;
1576 else if (!nr)
1577 nr = 1;
1578 delete_char(vc, nr);
1579 }
1580
1581 /* console_lock is held */
1582 static void csi_M(struct vc_data *vc, unsigned int nr)
1583 {
1584 if (nr > vc->vc_rows - vc->vc_y)
1585 nr = vc->vc_rows - vc->vc_y;
1586 else if (!nr)
1587 nr=1;
1588 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1589 vc->vc_need_wrap = 0;
1590 }
1591
1592 /* console_lock is held (except via vc_init->reset_terminal */
1593 static void save_cur(struct vc_data *vc)
1594 {
1595 vc->vc_saved_x = vc->vc_x;
1596 vc->vc_saved_y = vc->vc_y;
1597 vc->vc_s_intensity = vc->vc_intensity;
1598 vc->vc_s_italic = vc->vc_italic;
1599 vc->vc_s_underline = vc->vc_underline;
1600 vc->vc_s_blink = vc->vc_blink;
1601 vc->vc_s_reverse = vc->vc_reverse;
1602 vc->vc_s_charset = vc->vc_charset;
1603 vc->vc_s_color = vc->vc_color;
1604 vc->vc_saved_G0 = vc->vc_G0_charset;
1605 vc->vc_saved_G1 = vc->vc_G1_charset;
1606 }
1607
1608 /* console_lock is held */
1609 static void restore_cur(struct vc_data *vc)
1610 {
1611 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1612 vc->vc_intensity = vc->vc_s_intensity;
1613 vc->vc_italic = vc->vc_s_italic;
1614 vc->vc_underline = vc->vc_s_underline;
1615 vc->vc_blink = vc->vc_s_blink;
1616 vc->vc_reverse = vc->vc_s_reverse;
1617 vc->vc_charset = vc->vc_s_charset;
1618 vc->vc_color = vc->vc_s_color;
1619 vc->vc_G0_charset = vc->vc_saved_G0;
1620 vc->vc_G1_charset = vc->vc_saved_G1;
1621 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1622 update_attr(vc);
1623 vc->vc_need_wrap = 0;
1624 }
1625
1626 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1627 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1628 ESpalette };
1629
1630 /* console_lock is held (except via vc_init()) */
1631 static void reset_terminal(struct vc_data *vc, int do_clear)
1632 {
1633 vc->vc_top = 0;
1634 vc->vc_bottom = vc->vc_rows;
1635 vc->vc_state = ESnormal;
1636 vc->vc_ques = 0;
1637 vc->vc_translate = set_translate(LAT1_MAP, vc);
1638 vc->vc_G0_charset = LAT1_MAP;
1639 vc->vc_G1_charset = GRAF_MAP;
1640 vc->vc_charset = 0;
1641 vc->vc_need_wrap = 0;
1642 vc->vc_report_mouse = 0;
1643 vc->vc_utf = default_utf8;
1644 vc->vc_utf_count = 0;
1645
1646 vc->vc_disp_ctrl = 0;
1647 vc->vc_toggle_meta = 0;
1648
1649 vc->vc_decscnm = 0;
1650 vc->vc_decom = 0;
1651 vc->vc_decawm = 1;
1652 vc->vc_deccm = global_cursor_default;
1653 vc->vc_decim = 0;
1654
1655 set_kbd(vc, decarm);
1656 clr_kbd(vc, decckm);
1657 clr_kbd(vc, kbdapplic);
1658 clr_kbd(vc, lnm);
1659 kbd_table[vc->vc_num].lockstate = 0;
1660 kbd_table[vc->vc_num].slockstate = 0;
1661 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1662 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1663 /* do not do set_leds here because this causes an endless tasklet loop
1664 when the keyboard hasn't been initialized yet */
1665
1666 vc->vc_cursor_type = cur_default;
1667 vc->vc_complement_mask = vc->vc_s_complement_mask;
1668
1669 default_attr(vc);
1670 update_attr(vc);
1671
1672 vc->vc_tab_stop[0] = 0x01010100;
1673 vc->vc_tab_stop[1] =
1674 vc->vc_tab_stop[2] =
1675 vc->vc_tab_stop[3] =
1676 vc->vc_tab_stop[4] =
1677 vc->vc_tab_stop[5] =
1678 vc->vc_tab_stop[6] =
1679 vc->vc_tab_stop[7] = 0x01010101;
1680
1681 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1682 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1683
1684 gotoxy(vc, 0, 0);
1685 save_cur(vc);
1686 if (do_clear)
1687 csi_J(vc, 2);
1688 }
1689
1690 /* console_lock is held */
1691 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1692 {
1693 /*
1694 * Control characters can be used in the _middle_
1695 * of an escape sequence.
1696 */
1697 switch (c) {
1698 case 0:
1699 return;
1700 case 7:
1701 if (vc->vc_bell_duration)
1702 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1703 return;
1704 case 8:
1705 bs(vc);
1706 return;
1707 case 9:
1708 vc->vc_pos -= (vc->vc_x << 1);
1709 while (vc->vc_x < vc->vc_cols - 1) {
1710 vc->vc_x++;
1711 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1712 break;
1713 }
1714 vc->vc_pos += (vc->vc_x << 1);
1715 notify_write(vc, '\t');
1716 return;
1717 case 10: case 11: case 12:
1718 lf(vc);
1719 if (!is_kbd(vc, lnm))
1720 return;
1721 case 13:
1722 cr(vc);
1723 return;
1724 case 14:
1725 vc->vc_charset = 1;
1726 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1727 vc->vc_disp_ctrl = 1;
1728 return;
1729 case 15:
1730 vc->vc_charset = 0;
1731 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1732 vc->vc_disp_ctrl = 0;
1733 return;
1734 case 24: case 26:
1735 vc->vc_state = ESnormal;
1736 return;
1737 case 27:
1738 vc->vc_state = ESesc;
1739 return;
1740 case 127:
1741 del(vc);
1742 return;
1743 case 128+27:
1744 vc->vc_state = ESsquare;
1745 return;
1746 }
1747 switch(vc->vc_state) {
1748 case ESesc:
1749 vc->vc_state = ESnormal;
1750 switch (c) {
1751 case '[':
1752 vc->vc_state = ESsquare;
1753 return;
1754 case ']':
1755 vc->vc_state = ESnonstd;
1756 return;
1757 case '%':
1758 vc->vc_state = ESpercent;
1759 return;
1760 case 'E':
1761 cr(vc);
1762 lf(vc);
1763 return;
1764 case 'M':
1765 ri(vc);
1766 return;
1767 case 'D':
1768 lf(vc);
1769 return;
1770 case 'H':
1771 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1772 return;
1773 case 'Z':
1774 respond_ID(tty);
1775 return;
1776 case '7':
1777 save_cur(vc);
1778 return;
1779 case '8':
1780 restore_cur(vc);
1781 return;
1782 case '(':
1783 vc->vc_state = ESsetG0;
1784 return;
1785 case ')':
1786 vc->vc_state = ESsetG1;
1787 return;
1788 case '#':
1789 vc->vc_state = EShash;
1790 return;
1791 case 'c':
1792 reset_terminal(vc, 1);
1793 return;
1794 case '>': /* Numeric keypad */
1795 clr_kbd(vc, kbdapplic);
1796 return;
1797 case '=': /* Appl. keypad */
1798 set_kbd(vc, kbdapplic);
1799 return;
1800 }
1801 return;
1802 case ESnonstd:
1803 if (c=='P') { /* palette escape sequence */
1804 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1805 vc->vc_par[vc->vc_npar] = 0;
1806 vc->vc_npar = 0;
1807 vc->vc_state = ESpalette;
1808 return;
1809 } else if (c=='R') { /* reset palette */
1810 reset_palette(vc);
1811 vc->vc_state = ESnormal;
1812 } else
1813 vc->vc_state = ESnormal;
1814 return;
1815 case ESpalette:
1816 if (isxdigit(c)) {
1817 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1818 if (vc->vc_npar == 7) {
1819 int i = vc->vc_par[0] * 3, j = 1;
1820 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1821 vc->vc_palette[i++] += vc->vc_par[j++];
1822 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1823 vc->vc_palette[i++] += vc->vc_par[j++];
1824 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1825 vc->vc_palette[i] += vc->vc_par[j];
1826 set_palette(vc);
1827 vc->vc_state = ESnormal;
1828 }
1829 } else
1830 vc->vc_state = ESnormal;
1831 return;
1832 case ESsquare:
1833 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1834 vc->vc_par[vc->vc_npar] = 0;
1835 vc->vc_npar = 0;
1836 vc->vc_state = ESgetpars;
1837 if (c == '[') { /* Function key */
1838 vc->vc_state=ESfunckey;
1839 return;
1840 }
1841 vc->vc_ques = (c == '?');
1842 if (vc->vc_ques)
1843 return;
1844 case ESgetpars:
1845 if (c == ';' && vc->vc_npar < NPAR - 1) {
1846 vc->vc_npar++;
1847 return;
1848 } else if (c>='0' && c<='9') {
1849 vc->vc_par[vc->vc_npar] *= 10;
1850 vc->vc_par[vc->vc_npar] += c - '0';
1851 return;
1852 } else
1853 vc->vc_state = ESgotpars;
1854 case ESgotpars:
1855 vc->vc_state = ESnormal;
1856 switch(c) {
1857 case 'h':
1858 set_mode(vc, 1);
1859 return;
1860 case 'l':
1861 set_mode(vc, 0);
1862 return;
1863 case 'c':
1864 if (vc->vc_ques) {
1865 if (vc->vc_par[0])
1866 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1867 else
1868 vc->vc_cursor_type = cur_default;
1869 return;
1870 }
1871 break;
1872 case 'm':
1873 if (vc->vc_ques) {
1874 clear_selection();
1875 if (vc->vc_par[0])
1876 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1877 else
1878 vc->vc_complement_mask = vc->vc_s_complement_mask;
1879 return;
1880 }
1881 break;
1882 case 'n':
1883 if (!vc->vc_ques) {
1884 if (vc->vc_par[0] == 5)
1885 status_report(tty);
1886 else if (vc->vc_par[0] == 6)
1887 cursor_report(vc, tty);
1888 }
1889 return;
1890 }
1891 if (vc->vc_ques) {
1892 vc->vc_ques = 0;
1893 return;
1894 }
1895 switch(c) {
1896 case 'G': case '`':
1897 if (vc->vc_par[0])
1898 vc->vc_par[0]--;
1899 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1900 return;
1901 case 'A':
1902 if (!vc->vc_par[0])
1903 vc->vc_par[0]++;
1904 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1905 return;
1906 case 'B': case 'e':
1907 if (!vc->vc_par[0])
1908 vc->vc_par[0]++;
1909 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1910 return;
1911 case 'C': case 'a':
1912 if (!vc->vc_par[0])
1913 vc->vc_par[0]++;
1914 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1915 return;
1916 case 'D':
1917 if (!vc->vc_par[0])
1918 vc->vc_par[0]++;
1919 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1920 return;
1921 case 'E':
1922 if (!vc->vc_par[0])
1923 vc->vc_par[0]++;
1924 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1925 return;
1926 case 'F':
1927 if (!vc->vc_par[0])
1928 vc->vc_par[0]++;
1929 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1930 return;
1931 case 'd':
1932 if (vc->vc_par[0])
1933 vc->vc_par[0]--;
1934 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1935 return;
1936 case 'H': case 'f':
1937 if (vc->vc_par[0])
1938 vc->vc_par[0]--;
1939 if (vc->vc_par[1])
1940 vc->vc_par[1]--;
1941 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1942 return;
1943 case 'J':
1944 csi_J(vc, vc->vc_par[0]);
1945 return;
1946 case 'K':
1947 csi_K(vc, vc->vc_par[0]);
1948 return;
1949 case 'L':
1950 csi_L(vc, vc->vc_par[0]);
1951 return;
1952 case 'M':
1953 csi_M(vc, vc->vc_par[0]);
1954 return;
1955 case 'P':
1956 csi_P(vc, vc->vc_par[0]);
1957 return;
1958 case 'c':
1959 if (!vc->vc_par[0])
1960 respond_ID(tty);
1961 return;
1962 case 'g':
1963 if (!vc->vc_par[0])
1964 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1965 else if (vc->vc_par[0] == 3) {
1966 vc->vc_tab_stop[0] =
1967 vc->vc_tab_stop[1] =
1968 vc->vc_tab_stop[2] =
1969 vc->vc_tab_stop[3] =
1970 vc->vc_tab_stop[4] =
1971 vc->vc_tab_stop[5] =
1972 vc->vc_tab_stop[6] =
1973 vc->vc_tab_stop[7] = 0;
1974 }
1975 return;
1976 case 'm':
1977 csi_m(vc);
1978 return;
1979 case 'q': /* DECLL - but only 3 leds */
1980 /* map 0,1,2,3 to 0,1,2,4 */
1981 if (vc->vc_par[0] < 4)
1982 setledstate(kbd_table + vc->vc_num,
1983 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1984 return;
1985 case 'r':
1986 if (!vc->vc_par[0])
1987 vc->vc_par[0]++;
1988 if (!vc->vc_par[1])
1989 vc->vc_par[1] = vc->vc_rows;
1990 /* Minimum allowed region is 2 lines */
1991 if (vc->vc_par[0] < vc->vc_par[1] &&
1992 vc->vc_par[1] <= vc->vc_rows) {
1993 vc->vc_top = vc->vc_par[0] - 1;
1994 vc->vc_bottom = vc->vc_par[1];
1995 gotoxay(vc, 0, 0);
1996 }
1997 return;
1998 case 's':
1999 save_cur(vc);
2000 return;
2001 case 'u':
2002 restore_cur(vc);
2003 return;
2004 case 'X':
2005 csi_X(vc, vc->vc_par[0]);
2006 return;
2007 case '@':
2008 csi_at(vc, vc->vc_par[0]);
2009 return;
2010 case ']': /* setterm functions */
2011 setterm_command(vc);
2012 return;
2013 }
2014 return;
2015 case ESpercent:
2016 vc->vc_state = ESnormal;
2017 switch (c) {
2018 case '@': /* defined in ISO 2022 */
2019 vc->vc_utf = 0;
2020 return;
2021 case 'G': /* prelim official escape code */
2022 case '8': /* retained for compatibility */
2023 vc->vc_utf = 1;
2024 return;
2025 }
2026 return;
2027 case ESfunckey:
2028 vc->vc_state = ESnormal;
2029 return;
2030 case EShash:
2031 vc->vc_state = ESnormal;
2032 if (c == '8') {
2033 /* DEC screen alignment test. kludge :-) */
2034 vc->vc_video_erase_char =
2035 (vc->vc_video_erase_char & 0xff00) | 'E';
2036 csi_J(vc, 2);
2037 vc->vc_video_erase_char =
2038 (vc->vc_video_erase_char & 0xff00) | ' ';
2039 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2040 }
2041 return;
2042 case ESsetG0:
2043 if (c == '0')
2044 vc->vc_G0_charset = GRAF_MAP;
2045 else if (c == 'B')
2046 vc->vc_G0_charset = LAT1_MAP;
2047 else if (c == 'U')
2048 vc->vc_G0_charset = IBMPC_MAP;
2049 else if (c == 'K')
2050 vc->vc_G0_charset = USER_MAP;
2051 if (vc->vc_charset == 0)
2052 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2053 vc->vc_state = ESnormal;
2054 return;
2055 case ESsetG1:
2056 if (c == '0')
2057 vc->vc_G1_charset = GRAF_MAP;
2058 else if (c == 'B')
2059 vc->vc_G1_charset = LAT1_MAP;
2060 else if (c == 'U')
2061 vc->vc_G1_charset = IBMPC_MAP;
2062 else if (c == 'K')
2063 vc->vc_G1_charset = USER_MAP;
2064 if (vc->vc_charset == 1)
2065 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2066 vc->vc_state = ESnormal;
2067 return;
2068 default:
2069 vc->vc_state = ESnormal;
2070 }
2071 }
2072
2073 /* is_double_width() is based on the wcwidth() implementation by
2074 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2075 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2076 */
2077 struct interval {
2078 uint32_t first;
2079 uint32_t last;
2080 };
2081
2082 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2083 {
2084 int min = 0;
2085 int mid;
2086
2087 if (ucs < table[0].first || ucs > table[max].last)
2088 return 0;
2089 while (max >= min) {
2090 mid = (min + max) / 2;
2091 if (ucs > table[mid].last)
2092 min = mid + 1;
2093 else if (ucs < table[mid].first)
2094 max = mid - 1;
2095 else
2096 return 1;
2097 }
2098 return 0;
2099 }
2100
2101 static int is_double_width(uint32_t ucs)
2102 {
2103 static const struct interval double_width[] = {
2104 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2105 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2106 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2107 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2108 };
2109 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2110 }
2111
2112 /* acquires console_lock */
2113 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2114 {
2115 #ifdef VT_BUF_VRAM_ONLY
2116 #define FLUSH do { } while(0);
2117 #else
2118 #define FLUSH if (draw_x >= 0) { \
2119 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2120 draw_x = -1; \
2121 }
2122 #endif
2123
2124 int c, tc, ok, n = 0, draw_x = -1;
2125 unsigned int currcons;
2126 unsigned long draw_from = 0, draw_to = 0;
2127 struct vc_data *vc;
2128 unsigned char vc_attr;
2129 struct vt_notifier_param param;
2130 uint8_t rescan;
2131 uint8_t inverse;
2132 uint8_t width;
2133 u16 himask, charmask;
2134
2135 if (in_interrupt())
2136 return count;
2137
2138 might_sleep();
2139
2140 console_lock();
2141 vc = tty->driver_data;
2142 if (vc == NULL) {
2143 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2144 console_unlock();
2145 return 0;
2146 }
2147
2148 currcons = vc->vc_num;
2149 if (!vc_cons_allocated(currcons)) {
2150 /* could this happen? */
2151 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2152 console_unlock();
2153 return 0;
2154 }
2155
2156 himask = vc->vc_hi_font_mask;
2157 charmask = himask ? 0x1ff : 0xff;
2158
2159 /* undraw cursor first */
2160 if (IS_FG(vc))
2161 hide_cursor(vc);
2162
2163 param.vc = vc;
2164
2165 while (!tty->stopped && count) {
2166 int orig = *buf;
2167 c = orig;
2168 buf++;
2169 n++;
2170 count--;
2171 rescan = 0;
2172 inverse = 0;
2173 width = 1;
2174
2175 /* Do no translation at all in control states */
2176 if (vc->vc_state != ESnormal) {
2177 tc = c;
2178 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2179 /* Combine UTF-8 into Unicode in vc_utf_char.
2180 * vc_utf_count is the number of continuation bytes still
2181 * expected to arrive.
2182 * vc_npar is the number of continuation bytes arrived so
2183 * far
2184 */
2185 rescan_last_byte:
2186 if ((c & 0xc0) == 0x80) {
2187 /* Continuation byte received */
2188 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2189 if (vc->vc_utf_count) {
2190 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2191 vc->vc_npar++;
2192 if (--vc->vc_utf_count) {
2193 /* Still need some bytes */
2194 continue;
2195 }
2196 /* Got a whole character */
2197 c = vc->vc_utf_char;
2198 /* Reject overlong sequences */
2199 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2200 c > utf8_length_changes[vc->vc_npar])
2201 c = 0xfffd;
2202 } else {
2203 /* Unexpected continuation byte */
2204 vc->vc_utf_count = 0;
2205 c = 0xfffd;
2206 }
2207 } else {
2208 /* Single ASCII byte or first byte of a sequence received */
2209 if (vc->vc_utf_count) {
2210 /* Continuation byte expected */
2211 rescan = 1;
2212 vc->vc_utf_count = 0;
2213 c = 0xfffd;
2214 } else if (c > 0x7f) {
2215 /* First byte of a multibyte sequence received */
2216 vc->vc_npar = 0;
2217 if ((c & 0xe0) == 0xc0) {
2218 vc->vc_utf_count = 1;
2219 vc->vc_utf_char = (c & 0x1f);
2220 } else if ((c & 0xf0) == 0xe0) {
2221 vc->vc_utf_count = 2;
2222 vc->vc_utf_char = (c & 0x0f);
2223 } else if ((c & 0xf8) == 0xf0) {
2224 vc->vc_utf_count = 3;
2225 vc->vc_utf_char = (c & 0x07);
2226 } else if ((c & 0xfc) == 0xf8) {
2227 vc->vc_utf_count = 4;
2228 vc->vc_utf_char = (c & 0x03);
2229 } else if ((c & 0xfe) == 0xfc) {
2230 vc->vc_utf_count = 5;
2231 vc->vc_utf_char = (c & 0x01);
2232 } else {
2233 /* 254 and 255 are invalid */
2234 c = 0xfffd;
2235 }
2236 if (vc->vc_utf_count) {
2237 /* Still need some bytes */
2238 continue;
2239 }
2240 }
2241 /* Nothing to do if an ASCII byte was received */
2242 }
2243 /* End of UTF-8 decoding. */
2244 /* c is the received character, or U+FFFD for invalid sequences. */
2245 /* Replace invalid Unicode code points with U+FFFD too */
2246 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2247 c = 0xfffd;
2248 tc = c;
2249 } else { /* no utf or alternate charset mode */
2250 tc = vc_translate(vc, c);
2251 }
2252
2253 param.c = tc;
2254 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2255 &param) == NOTIFY_STOP)
2256 continue;
2257
2258 /* If the original code was a control character we
2259 * only allow a glyph to be displayed if the code is
2260 * not normally used (such as for cursor movement) or
2261 * if the disp_ctrl mode has been explicitly enabled.
2262 * Certain characters (as given by the CTRL_ALWAYS
2263 * bitmap) are always displayed as control characters,
2264 * as the console would be pretty useless without
2265 * them; to display an arbitrary font position use the
2266 * direct-to-font zone in UTF-8 mode.
2267 */
2268 ok = tc && (c >= 32 ||
2269 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2270 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2271 && (c != 127 || vc->vc_disp_ctrl)
2272 && (c != 128+27);
2273
2274 if (vc->vc_state == ESnormal && ok) {
2275 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2276 if (is_double_width(c))
2277 width = 2;
2278 }
2279 /* Now try to find out how to display it */
2280 tc = conv_uni_to_pc(vc, tc);
2281 if (tc & ~charmask) {
2282 if (tc == -1 || tc == -2) {
2283 continue; /* nothing to display */
2284 }
2285 /* Glyph not found */
2286 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2287 /* In legacy mode use the glyph we get by a 1:1 mapping.
2288 This would make absolutely no sense with Unicode in mind,
2289 but do this for ASCII characters since a font may lack
2290 Unicode mapping info and we don't want to end up with
2291 having question marks only. */
2292 tc = c;
2293 } else {
2294 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2295 tc = conv_uni_to_pc(vc, 0xfffd);
2296 if (tc < 0) {
2297 inverse = 1;
2298 tc = conv_uni_to_pc(vc, '?');
2299 if (tc < 0) tc = '?';
2300 }
2301 }
2302 }
2303
2304 if (!inverse) {
2305 vc_attr = vc->vc_attr;
2306 } else {
2307 /* invert vc_attr */
2308 if (!vc->vc_can_do_color) {
2309 vc_attr = (vc->vc_attr) ^ 0x08;
2310 } else if (vc->vc_hi_font_mask == 0x100) {
2311 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2312 } else {
2313 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2314 }
2315 FLUSH
2316 }
2317
2318 while (1) {
2319 if (vc->vc_need_wrap || vc->vc_decim)
2320 FLUSH
2321 if (vc->vc_need_wrap) {
2322 cr(vc);
2323 lf(vc);
2324 }
2325 if (vc->vc_decim)
2326 insert_char(vc, 1);
2327 scr_writew(himask ?
2328 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2329 (vc_attr << 8) + tc,
2330 (u16 *) vc->vc_pos);
2331 if (DO_UPDATE(vc) && draw_x < 0) {
2332 draw_x = vc->vc_x;
2333 draw_from = vc->vc_pos;
2334 }
2335 if (vc->vc_x == vc->vc_cols - 1) {
2336 vc->vc_need_wrap = vc->vc_decawm;
2337 draw_to = vc->vc_pos + 2;
2338 } else {
2339 vc->vc_x++;
2340 draw_to = (vc->vc_pos += 2);
2341 }
2342
2343 if (!--width) break;
2344
2345 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2346 if (tc < 0) tc = ' ';
2347 }
2348 notify_write(vc, c);
2349
2350 if (inverse) {
2351 FLUSH
2352 }
2353
2354 if (rescan) {
2355 rescan = 0;
2356 inverse = 0;
2357 width = 1;
2358 c = orig;
2359 goto rescan_last_byte;
2360 }
2361 continue;
2362 }
2363 FLUSH
2364 do_con_trol(tty, vc, orig);
2365 }
2366 FLUSH
2367 console_conditional_schedule();
2368 console_unlock();
2369 notify_update(vc);
2370 return n;
2371 #undef FLUSH
2372 }
2373
2374 /*
2375 * This is the console switching callback.
2376 *
2377 * Doing console switching in a process context allows
2378 * us to do the switches asynchronously (needed when we want
2379 * to switch due to a keyboard interrupt). Synchronization
2380 * with other console code and prevention of re-entrancy is
2381 * ensured with console_lock.
2382 */
2383 static void console_callback(struct work_struct *ignored)
2384 {
2385 console_lock();
2386
2387 if (want_console >= 0) {
2388 if (want_console != fg_console &&
2389 vc_cons_allocated(want_console)) {
2390 hide_cursor(vc_cons[fg_console].d);
2391 change_console(vc_cons[want_console].d);
2392 /* we only changed when the console had already
2393 been allocated - a new console is not created
2394 in an interrupt routine */
2395 }
2396 want_console = -1;
2397 }
2398 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2399 do_poke_blanked_console = 0;
2400 poke_blanked_console();
2401 }
2402 if (scrollback_delta) {
2403 struct vc_data *vc = vc_cons[fg_console].d;
2404 clear_selection();
2405 if (vc->vc_mode == KD_TEXT)
2406 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2407 scrollback_delta = 0;
2408 }
2409 if (blank_timer_expired) {
2410 do_blank_screen(0);
2411 blank_timer_expired = 0;
2412 }
2413 notify_update(vc_cons[fg_console].d);
2414
2415 console_unlock();
2416 }
2417
2418 int set_console(int nr)
2419 {
2420 struct vc_data *vc = vc_cons[fg_console].d;
2421
2422 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2423 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2424
2425 /*
2426 * Console switch will fail in console_callback() or
2427 * change_console() so there is no point scheduling
2428 * the callback
2429 *
2430 * Existing set_console() users don't check the return
2431 * value so this shouldn't break anything
2432 */
2433 return -EINVAL;
2434 }
2435
2436 want_console = nr;
2437 schedule_console_callback();
2438
2439 return 0;
2440 }
2441
2442 struct tty_driver *console_driver;
2443
2444 #ifdef CONFIG_VT_CONSOLE
2445
2446 /**
2447 * vt_kmsg_redirect() - Sets/gets the kernel message console
2448 * @new: The new virtual terminal number or -1 if the console should stay
2449 * unchanged
2450 *
2451 * By default, the kernel messages are always printed on the current virtual
2452 * console. However, the user may modify that default with the
2453 * TIOCL_SETKMSGREDIRECT ioctl call.
2454 *
2455 * This function sets the kernel message console to be @new. It returns the old
2456 * virtual console number. The virtual terminal number 0 (both as parameter and
2457 * return value) means no redirection (i.e. always printed on the currently
2458 * active console).
2459 *
2460 * The parameter -1 means that only the current console is returned, but the
2461 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2462 * case to make the code more understandable.
2463 *
2464 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2465 * the parameter and always returns 0.
2466 */
2467 int vt_kmsg_redirect(int new)
2468 {
2469 static int kmsg_con;
2470
2471 if (new != -1)
2472 return xchg(&kmsg_con, new);
2473 else
2474 return kmsg_con;
2475 }
2476
2477 /*
2478 * Console on virtual terminal
2479 *
2480 * The console must be locked when we get here.
2481 */
2482
2483 static void vt_console_print(struct console *co, const char *b, unsigned count)
2484 {
2485 struct vc_data *vc = vc_cons[fg_console].d;
2486 unsigned char c;
2487 static DEFINE_SPINLOCK(printing_lock);
2488 const ushort *start;
2489 ushort cnt = 0;
2490 ushort myx;
2491 int kmsg_console;
2492
2493 /* console busy or not yet initialized */
2494 if (!printable)
2495 return;
2496 if (!spin_trylock(&printing_lock))
2497 return;
2498
2499 kmsg_console = vt_get_kmsg_redirect();
2500 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2501 vc = vc_cons[kmsg_console - 1].d;
2502
2503 /* read `x' only after setting currcons properly (otherwise
2504 the `x' macro will read the x of the foreground console). */
2505 myx = vc->vc_x;
2506
2507 if (!vc_cons_allocated(fg_console)) {
2508 /* impossible */
2509 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2510 goto quit;
2511 }
2512
2513 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2514 goto quit;
2515
2516 /* undraw cursor first */
2517 if (IS_FG(vc))
2518 hide_cursor(vc);
2519
2520 start = (ushort *)vc->vc_pos;
2521
2522 /* Contrived structure to try to emulate original need_wrap behaviour
2523 * Problems caused when we have need_wrap set on '\n' character */
2524 while (count--) {
2525 c = *b++;
2526 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2527 if (cnt > 0) {
2528 if (CON_IS_VISIBLE(vc))
2529 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2530 vc->vc_x += cnt;
2531 if (vc->vc_need_wrap)
2532 vc->vc_x--;
2533 cnt = 0;
2534 }
2535 if (c == 8) { /* backspace */
2536 bs(vc);
2537 start = (ushort *)vc->vc_pos;
2538 myx = vc->vc_x;
2539 continue;
2540 }
2541 if (c != 13)
2542 lf(vc);
2543 cr(vc);
2544 start = (ushort *)vc->vc_pos;
2545 myx = vc->vc_x;
2546 if (c == 10 || c == 13)
2547 continue;
2548 }
2549 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2550 notify_write(vc, c);
2551 cnt++;
2552 if (myx == vc->vc_cols - 1) {
2553 vc->vc_need_wrap = 1;
2554 continue;
2555 }
2556 vc->vc_pos += 2;
2557 myx++;
2558 }
2559 if (cnt > 0) {
2560 if (CON_IS_VISIBLE(vc))
2561 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2562 vc->vc_x += cnt;
2563 if (vc->vc_x == vc->vc_cols) {
2564 vc->vc_x--;
2565 vc->vc_need_wrap = 1;
2566 }
2567 }
2568 set_cursor(vc);
2569 notify_update(vc);
2570
2571 quit:
2572 spin_unlock(&printing_lock);
2573 }
2574
2575 static struct tty_driver *vt_console_device(struct console *c, int *index)
2576 {
2577 *index = c->index ? c->index-1 : fg_console;
2578 return console_driver;
2579 }
2580
2581 static struct console vt_console_driver = {
2582 .name = "tty",
2583 .write = vt_console_print,
2584 .device = vt_console_device,
2585 .unblank = unblank_screen,
2586 .flags = CON_PRINTBUFFER,
2587 .index = -1,
2588 };
2589 #endif
2590
2591 /*
2592 * Handling of Linux-specific VC ioctls
2593 */
2594
2595 /*
2596 * Generally a bit racy with respect to console_lock();.
2597 *
2598 * There are some functions which don't need it.
2599 *
2600 * There are some functions which can sleep for arbitrary periods
2601 * (paste_selection) but we don't need the lock there anyway.
2602 *
2603 * set_selection has locking, and definitely needs it
2604 */
2605
2606 int tioclinux(struct tty_struct *tty, unsigned long arg)
2607 {
2608 char type, data;
2609 char __user *p = (char __user *)arg;
2610 int lines;
2611 int ret;
2612
2613 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2614 return -EPERM;
2615 if (get_user(type, p))
2616 return -EFAULT;
2617 ret = 0;
2618
2619 switch (type)
2620 {
2621 case TIOCL_SETSEL:
2622 console_lock();
2623 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2624 console_unlock();
2625 break;
2626 case TIOCL_PASTESEL:
2627 ret = paste_selection(tty);
2628 break;
2629 case TIOCL_UNBLANKSCREEN:
2630 console_lock();
2631 unblank_screen();
2632 console_unlock();
2633 break;
2634 case TIOCL_SELLOADLUT:
2635 ret = sel_loadlut(p);
2636 break;
2637 case TIOCL_GETSHIFTSTATE:
2638
2639 /*
2640 * Make it possible to react to Shift+Mousebutton.
2641 * Note that 'shift_state' is an undocumented
2642 * kernel-internal variable; programs not closely
2643 * related to the kernel should not use this.
2644 */
2645 data = shift_state;
2646 ret = __put_user(data, p);
2647 break;
2648 case TIOCL_GETMOUSEREPORTING:
2649 data = mouse_reporting();
2650 ret = __put_user(data, p);
2651 break;
2652 case TIOCL_SETVESABLANK:
2653 ret = set_vesa_blanking(p);
2654 break;
2655 case TIOCL_GETKMSGREDIRECT:
2656 data = vt_get_kmsg_redirect();
2657 ret = __put_user(data, p);
2658 break;
2659 case TIOCL_SETKMSGREDIRECT:
2660 if (!capable(CAP_SYS_ADMIN)) {
2661 ret = -EPERM;
2662 } else {
2663 if (get_user(data, p+1))
2664 ret = -EFAULT;
2665 else
2666 vt_kmsg_redirect(data);
2667 }
2668 break;
2669 case TIOCL_GETFGCONSOLE:
2670 ret = fg_console;
2671 break;
2672 case TIOCL_SCROLLCONSOLE:
2673 if (get_user(lines, (s32 __user *)(p+4))) {
2674 ret = -EFAULT;
2675 } else {
2676 scrollfront(vc_cons[fg_console].d, lines);
2677 ret = 0;
2678 }
2679 break;
2680 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2681 console_lock();
2682 ignore_poke = 1;
2683 do_blank_screen(0);
2684 console_unlock();
2685 break;
2686 case TIOCL_BLANKEDSCREEN:
2687 ret = console_blanked;
2688 break;
2689 default:
2690 ret = -EINVAL;
2691 break;
2692 }
2693 return ret;
2694 }
2695
2696 /*
2697 * /dev/ttyN handling
2698 */
2699
2700 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2701 {
2702 int retval;
2703
2704 retval = do_con_write(tty, buf, count);
2705 con_flush_chars(tty);
2706
2707 return retval;
2708 }
2709
2710 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2711 {
2712 if (in_interrupt())
2713 return 0; /* n_r3964 calls put_char() from interrupt context */
2714 return do_con_write(tty, &ch, 1);
2715 }
2716
2717 static int con_write_room(struct tty_struct *tty)
2718 {
2719 if (tty->stopped)
2720 return 0;
2721 return 32768; /* No limit, really; we're not buffering */
2722 }
2723
2724 static int con_chars_in_buffer(struct tty_struct *tty)
2725 {
2726 return 0; /* we're not buffering */
2727 }
2728
2729 /*
2730 * con_throttle and con_unthrottle are only used for
2731 * paste_selection(), which has to stuff in a large number of
2732 * characters...
2733 */
2734 static void con_throttle(struct tty_struct *tty)
2735 {
2736 }
2737
2738 static void con_unthrottle(struct tty_struct *tty)
2739 {
2740 struct vc_data *vc = tty->driver_data;
2741
2742 wake_up_interruptible(&vc->paste_wait);
2743 }
2744
2745 /*
2746 * Turn the Scroll-Lock LED on when the tty is stopped
2747 */
2748 static void con_stop(struct tty_struct *tty)
2749 {
2750 int console_num;
2751 if (!tty)
2752 return;
2753 console_num = tty->index;
2754 if (!vc_cons_allocated(console_num))
2755 return;
2756 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2757 set_leds();
2758 }
2759
2760 /*
2761 * Turn the Scroll-Lock LED off when the console is started
2762 */
2763 static void con_start(struct tty_struct *tty)
2764 {
2765 int console_num;
2766 if (!tty)
2767 return;
2768 console_num = tty->index;
2769 if (!vc_cons_allocated(console_num))
2770 return;
2771 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2772 set_leds();
2773 }
2774
2775 static void con_flush_chars(struct tty_struct *tty)
2776 {
2777 struct vc_data *vc;
2778
2779 if (in_interrupt()) /* from flush_to_ldisc */
2780 return;
2781
2782 /* if we race with con_close(), vt may be null */
2783 console_lock();
2784 vc = tty->driver_data;
2785 if (vc)
2786 set_cursor(vc);
2787 console_unlock();
2788 }
2789
2790 /*
2791 * Allocate the console screen memory.
2792 */
2793 static int con_open(struct tty_struct *tty, struct file *filp)
2794 {
2795 unsigned int currcons = tty->index;
2796 int ret = 0;
2797
2798 console_lock();
2799 if (tty->driver_data == NULL) {
2800 ret = vc_allocate(currcons);
2801 if (ret == 0) {
2802 struct vc_data *vc = vc_cons[currcons].d;
2803
2804 /* Still being freed */
2805 if (vc->port.tty) {
2806 console_unlock();
2807 return -ERESTARTSYS;
2808 }
2809 tty->driver_data = vc;
2810 vc->port.tty = tty;
2811
2812 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2813 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2814 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2815 }
2816 if (vc->vc_utf)
2817 tty->termios->c_iflag |= IUTF8;
2818 else
2819 tty->termios->c_iflag &= ~IUTF8;
2820 console_unlock();
2821 return ret;
2822 }
2823 }
2824 console_unlock();
2825 return ret;
2826 }
2827
2828 static void con_close(struct tty_struct *tty, struct file *filp)
2829 {
2830 /* Nothing to do - we defer to shutdown */
2831 }
2832
2833 static void con_shutdown(struct tty_struct *tty)
2834 {
2835 struct vc_data *vc = tty->driver_data;
2836 BUG_ON(vc == NULL);
2837 console_lock();
2838 vc->port.tty = NULL;
2839 console_unlock();
2840 tty_shutdown(tty);
2841 }
2842
2843 static int default_italic_color = 2; // green (ASCII)
2844 static int default_underline_color = 3; // cyan (ASCII)
2845 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2846 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2847
2848 static void vc_init(struct vc_data *vc, unsigned int rows,
2849 unsigned int cols, int do_clear)
2850 {
2851 int j, k ;
2852
2853 vc->vc_cols = cols;
2854 vc->vc_rows = rows;
2855 vc->vc_size_row = cols << 1;
2856 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2857
2858 set_origin(vc);
2859 vc->vc_pos = vc->vc_origin;
2860 reset_vc(vc);
2861 for (j=k=0; j<16; j++) {
2862 vc->vc_palette[k++] = default_red[j] ;
2863 vc->vc_palette[k++] = default_grn[j] ;
2864 vc->vc_palette[k++] = default_blu[j] ;
2865 }
2866 vc->vc_def_color = 0x07; /* white */
2867 vc->vc_ulcolor = default_underline_color;
2868 vc->vc_itcolor = default_italic_color;
2869 vc->vc_halfcolor = 0x08; /* grey */
2870 init_waitqueue_head(&vc->paste_wait);
2871 reset_terminal(vc, do_clear);
2872 }
2873
2874 /*
2875 * This routine initializes console interrupts, and does nothing
2876 * else. If you want the screen to clear, call tty_write with
2877 * the appropriate escape-sequence.
2878 */
2879
2880 static int __init con_init(void)
2881 {
2882 const char *display_desc = NULL;
2883 struct vc_data *vc;
2884 unsigned int currcons = 0, i;
2885
2886 console_lock();
2887
2888 if (conswitchp)
2889 display_desc = conswitchp->con_startup();
2890 if (!display_desc) {
2891 fg_console = 0;
2892 console_unlock();
2893 return 0;
2894 }
2895
2896 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2897 struct con_driver *con_driver = &registered_con_driver[i];
2898
2899 if (con_driver->con == NULL) {
2900 con_driver->con = conswitchp;
2901 con_driver->desc = display_desc;
2902 con_driver->flag = CON_DRIVER_FLAG_INIT;
2903 con_driver->first = 0;
2904 con_driver->last = MAX_NR_CONSOLES - 1;
2905 break;
2906 }
2907 }
2908
2909 for (i = 0; i < MAX_NR_CONSOLES; i++)
2910 con_driver_map[i] = conswitchp;
2911
2912 if (blankinterval) {
2913 blank_state = blank_normal_wait;
2914 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2915 }
2916
2917 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2918 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2919 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2920 tty_port_init(&vc->port);
2921 visual_init(vc, currcons, 1);
2922 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2923 vc_init(vc, vc->vc_rows, vc->vc_cols,
2924 currcons || !vc->vc_sw->con_save_screen);
2925 }
2926 currcons = fg_console = 0;
2927 master_display_fg = vc = vc_cons[currcons].d;
2928 set_origin(vc);
2929 save_screen(vc);
2930 gotoxy(vc, vc->vc_x, vc->vc_y);
2931 csi_J(vc, 0);
2932 update_screen(vc);
2933 pr_info("Console: %s %s %dx%d",
2934 vc->vc_can_do_color ? "colour" : "mono",
2935 display_desc, vc->vc_cols, vc->vc_rows);
2936 printable = 1;
2937 printk("\n");
2938
2939 console_unlock();
2940
2941 #ifdef CONFIG_VT_CONSOLE
2942 register_console(&vt_console_driver);
2943 #endif
2944 return 0;
2945 }
2946 console_initcall(con_init);
2947
2948 static const struct tty_operations con_ops = {
2949 .open = con_open,
2950 .close = con_close,
2951 .write = con_write,
2952 .write_room = con_write_room,
2953 .put_char = con_put_char,
2954 .flush_chars = con_flush_chars,
2955 .chars_in_buffer = con_chars_in_buffer,
2956 .ioctl = vt_ioctl,
2957 #ifdef CONFIG_COMPAT
2958 .compat_ioctl = vt_compat_ioctl,
2959 #endif
2960 .stop = con_stop,
2961 .start = con_start,
2962 .throttle = con_throttle,
2963 .unthrottle = con_unthrottle,
2964 .resize = vt_resize,
2965 .shutdown = con_shutdown
2966 };
2967
2968 static struct cdev vc0_cdev;
2969
2970 static ssize_t show_tty_active(struct device *dev,
2971 struct device_attribute *attr, char *buf)
2972 {
2973 return sprintf(buf, "tty%d\n", fg_console + 1);
2974 }
2975 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2976
2977 int __init vty_init(const struct file_operations *console_fops)
2978 {
2979 cdev_init(&vc0_cdev, console_fops);
2980 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2981 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2982 panic("Couldn't register /dev/tty0 driver\n");
2983 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2984 if (IS_ERR(tty0dev))
2985 tty0dev = NULL;
2986 else
2987 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2988
2989 vcs_init();
2990
2991 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2992 if (!console_driver)
2993 panic("Couldn't allocate console driver\n");
2994 console_driver->owner = THIS_MODULE;
2995 console_driver->name = "tty";
2996 console_driver->name_base = 1;
2997 console_driver->major = TTY_MAJOR;
2998 console_driver->minor_start = 1;
2999 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3000 console_driver->init_termios = tty_std_termios;
3001 if (default_utf8)
3002 console_driver->init_termios.c_iflag |= IUTF8;
3003 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3004 tty_set_operations(console_driver, &con_ops);
3005 if (tty_register_driver(console_driver))
3006 panic("Couldn't register console driver\n");
3007 kbd_init();
3008 console_map_init();
3009 #ifdef CONFIG_MDA_CONSOLE
3010 mda_console_init();
3011 #endif
3012 return 0;
3013 }
3014
3015 #ifndef VT_SINGLE_DRIVER
3016
3017 static struct class *vtconsole_class;
3018
3019 static int bind_con_driver(const struct consw *csw, int first, int last,
3020 int deflt)
3021 {
3022 struct module *owner = csw->owner;
3023 const char *desc = NULL;
3024 struct con_driver *con_driver;
3025 int i, j = -1, k = -1, retval = -ENODEV;
3026
3027 if (!try_module_get(owner))
3028 return -ENODEV;
3029
3030 console_lock();
3031
3032 /* check if driver is registered */
3033 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3034 con_driver = &registered_con_driver[i];
3035
3036 if (con_driver->con == csw) {
3037 desc = con_driver->desc;
3038 retval = 0;
3039 break;
3040 }
3041 }
3042
3043 if (retval)
3044 goto err;
3045
3046 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3047 csw->con_startup();
3048 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3049 }
3050
3051 if (deflt) {
3052 if (conswitchp)
3053 module_put(conswitchp->owner);
3054
3055 __module_get(owner);
3056 conswitchp = csw;
3057 }
3058
3059 first = max(first, con_driver->first);
3060 last = min(last, con_driver->last);
3061
3062 for (i = first; i <= last; i++) {
3063 int old_was_color;
3064 struct vc_data *vc = vc_cons[i].d;
3065
3066 if (con_driver_map[i])
3067 module_put(con_driver_map[i]->owner);
3068 __module_get(owner);
3069 con_driver_map[i] = csw;
3070
3071 if (!vc || !vc->vc_sw)
3072 continue;
3073
3074 j = i;
3075
3076 if (CON_IS_VISIBLE(vc)) {
3077 k = i;
3078 save_screen(vc);
3079 }
3080
3081 old_was_color = vc->vc_can_do_color;
3082 vc->vc_sw->con_deinit(vc);
3083 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3084 visual_init(vc, i, 0);
3085 set_origin(vc);
3086 update_attr(vc);
3087
3088 /* If the console changed between mono <-> color, then
3089 * the attributes in the screenbuf will be wrong. The
3090 * following resets all attributes to something sane.
3091 */
3092 if (old_was_color != vc->vc_can_do_color)
3093 clear_buffer_attributes(vc);
3094 }
3095
3096 pr_info("Console: switching ");
3097 if (!deflt)
3098 printk("consoles %d-%d ", first+1, last+1);
3099 if (j >= 0) {
3100 struct vc_data *vc = vc_cons[j].d;
3101
3102 printk("to %s %s %dx%d\n",
3103 vc->vc_can_do_color ? "colour" : "mono",
3104 desc, vc->vc_cols, vc->vc_rows);
3105
3106 if (k >= 0) {
3107 vc = vc_cons[k].d;
3108 update_screen(vc);
3109 }
3110 } else
3111 printk("to %s\n", desc);
3112
3113 retval = 0;
3114 err:
3115 console_unlock();
3116 module_put(owner);
3117 return retval;
3118 };
3119
3120 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3121 static int con_is_graphics(const struct consw *csw, int first, int last)
3122 {
3123 int i, retval = 0;
3124
3125 for (i = first; i <= last; i++) {
3126 struct vc_data *vc = vc_cons[i].d;
3127
3128 if (vc && vc->vc_mode == KD_GRAPHICS) {
3129 retval = 1;
3130 break;
3131 }
3132 }
3133
3134 return retval;
3135 }
3136
3137 /**
3138 * unbind_con_driver - unbind a console driver
3139 * @csw: pointer to console driver to unregister
3140 * @first: first in range of consoles that @csw should be unbound from
3141 * @last: last in range of consoles that @csw should be unbound from
3142 * @deflt: should next bound console driver be default after @csw is unbound?
3143 *
3144 * To unbind a driver from all possible consoles, pass 0 as @first and
3145 * %MAX_NR_CONSOLES as @last.
3146 *
3147 * @deflt controls whether the console that ends up replacing @csw should be
3148 * the default console.
3149 *
3150 * RETURNS:
3151 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3152 * or 0 on success.
3153 */
3154 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3155 {
3156 struct module *owner = csw->owner;
3157 const struct consw *defcsw = NULL;
3158 struct con_driver *con_driver = NULL, *con_back = NULL;
3159 int i, retval = -ENODEV;
3160
3161 if (!try_module_get(owner))
3162 return -ENODEV;
3163
3164 console_lock();
3165
3166 /* check if driver is registered and if it is unbindable */
3167 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3168 con_driver = &registered_con_driver[i];
3169
3170 if (con_driver->con == csw &&
3171 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3172 retval = 0;
3173 break;
3174 }
3175 }
3176
3177 if (retval) {
3178 console_unlock();
3179 goto err;
3180 }
3181
3182 retval = -ENODEV;
3183
3184 /* check if backup driver exists */
3185 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3186 con_back = &registered_con_driver[i];
3187
3188 if (con_back->con &&
3189 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3190 defcsw = con_back->con;
3191 retval = 0;
3192 break;
3193 }
3194 }
3195
3196 if (retval) {
3197 console_unlock();
3198 goto err;
3199 }
3200
3201 if (!con_is_bound(csw)) {
3202 console_unlock();
3203 goto err;
3204 }
3205
3206 first = max(first, con_driver->first);
3207 last = min(last, con_driver->last);
3208
3209 for (i = first; i <= last; i++) {
3210 if (con_driver_map[i] == csw) {
3211 module_put(csw->owner);
3212 con_driver_map[i] = NULL;
3213 }
3214 }
3215
3216 if (!con_is_bound(defcsw)) {
3217 const struct consw *defconsw = conswitchp;
3218
3219 defcsw->con_startup();
3220 con_back->flag |= CON_DRIVER_FLAG_INIT;
3221 /*
3222 * vgacon may change the default driver to point
3223 * to dummycon, we restore it here...
3224 */
3225 conswitchp = defconsw;
3226 }
3227
3228 if (!con_is_bound(csw))
3229 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3230
3231 console_unlock();
3232 /* ignore return value, binding should not fail */
3233 bind_con_driver(defcsw, first, last, deflt);
3234 err:
3235 module_put(owner);
3236 return retval;
3237
3238 }
3239 EXPORT_SYMBOL(unbind_con_driver);
3240
3241 static int vt_bind(struct con_driver *con)
3242 {
3243 const struct consw *defcsw = NULL, *csw = NULL;
3244 int i, more = 1, first = -1, last = -1, deflt = 0;
3245
3246 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3247 con_is_graphics(con->con, con->first, con->last))
3248 goto err;
3249
3250 csw = con->con;
3251
3252 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3253 struct con_driver *con = &registered_con_driver[i];
3254
3255 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3256 defcsw = con->con;
3257 break;
3258 }
3259 }
3260
3261 if (!defcsw)
3262 goto err;
3263
3264 while (more) {
3265 more = 0;
3266
3267 for (i = con->first; i <= con->last; i++) {
3268 if (con_driver_map[i] == defcsw) {
3269 if (first == -1)
3270 first = i;
3271 last = i;
3272 more = 1;
3273 } else if (first != -1)
3274 break;
3275 }
3276
3277 if (first == 0 && last == MAX_NR_CONSOLES -1)
3278 deflt = 1;
3279
3280 if (first != -1)
3281 bind_con_driver(csw, first, last, deflt);
3282
3283 first = -1;
3284 last = -1;
3285 deflt = 0;
3286 }
3287
3288 err:
3289 return 0;
3290 }
3291
3292 static int vt_unbind(struct con_driver *con)
3293 {
3294 const struct consw *csw = NULL;
3295 int i, more = 1, first = -1, last = -1, deflt = 0;
3296
3297 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3298 con_is_graphics(con->con, con->first, con->last))
3299 goto err;
3300
3301 csw = con->con;
3302
3303 while (more) {
3304 more = 0;
3305
3306 for (i = con->first; i <= con->last; i++) {
3307 if (con_driver_map[i] == csw) {
3308 if (first == -1)
3309 first = i;
3310 last = i;
3311 more = 1;
3312 } else if (first != -1)
3313 break;
3314 }
3315
3316 if (first == 0 && last == MAX_NR_CONSOLES -1)
3317 deflt = 1;
3318
3319 if (first != -1)
3320 unbind_con_driver(csw, first, last, deflt);
3321
3322 first = -1;
3323 last = -1;
3324 deflt = 0;
3325 }
3326
3327 err:
3328 return 0;
3329 }
3330 #else
3331 static inline int vt_bind(struct con_driver *con)
3332 {
3333 return 0;
3334 }
3335 static inline int vt_unbind(struct con_driver *con)
3336 {
3337 return 0;
3338 }
3339 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3340
3341 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3342 const char *buf, size_t count)
3343 {
3344 struct con_driver *con = dev_get_drvdata(dev);
3345 int bind = simple_strtoul(buf, NULL, 0);
3346
3347 if (bind)
3348 vt_bind(con);
3349 else
3350 vt_unbind(con);
3351
3352 return count;
3353 }
3354
3355 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3356 char *buf)
3357 {
3358 struct con_driver *con = dev_get_drvdata(dev);
3359 int bind = con_is_bound(con->con);
3360
3361 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3362 }
3363
3364 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3365 char *buf)
3366 {
3367 struct con_driver *con = dev_get_drvdata(dev);
3368
3369 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3370 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3371 con->desc);
3372
3373 }
3374
3375 static struct device_attribute device_attrs[] = {
3376 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3377 __ATTR(name, S_IRUGO, show_name, NULL),
3378 };
3379
3380 static int vtconsole_init_device(struct con_driver *con)
3381 {
3382 int i;
3383 int error = 0;
3384
3385 con->flag |= CON_DRIVER_FLAG_ATTR;
3386 dev_set_drvdata(con->dev, con);
3387 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3388 error = device_create_file(con->dev, &device_attrs[i]);
3389 if (error)
3390 break;
3391 }
3392
3393 if (error) {
3394 while (--i >= 0)
3395 device_remove_file(con->dev, &device_attrs[i]);
3396 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3397 }
3398
3399 return error;
3400 }
3401
3402 static void vtconsole_deinit_device(struct con_driver *con)
3403 {
3404 int i;
3405
3406 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3407 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3408 device_remove_file(con->dev, &device_attrs[i]);
3409 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3410 }
3411 }
3412
3413 /**
3414 * con_is_bound - checks if driver is bound to the console
3415 * @csw: console driver
3416 *
3417 * RETURNS: zero if unbound, nonzero if bound
3418 *
3419 * Drivers can call this and if zero, they should release
3420 * all resources allocated on con_startup()
3421 */
3422 int con_is_bound(const struct consw *csw)
3423 {
3424 int i, bound = 0;
3425
3426 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3427 if (con_driver_map[i] == csw) {
3428 bound = 1;
3429 break;
3430 }
3431 }
3432
3433 return bound;
3434 }
3435 EXPORT_SYMBOL(con_is_bound);
3436
3437 /**
3438 * con_debug_enter - prepare the console for the kernel debugger
3439 * @sw: console driver
3440 *
3441 * Called when the console is taken over by the kernel debugger, this
3442 * function needs to save the current console state, then put the console
3443 * into a state suitable for the kernel debugger.
3444 *
3445 * RETURNS:
3446 * Zero on success, nonzero if a failure occurred when trying to prepare
3447 * the console for the debugger.
3448 */
3449 int con_debug_enter(struct vc_data *vc)
3450 {
3451 int ret = 0;
3452
3453 saved_fg_console = fg_console;
3454 saved_last_console = last_console;
3455 saved_want_console = want_console;
3456 saved_vc_mode = vc->vc_mode;
3457 saved_console_blanked = console_blanked;
3458 vc->vc_mode = KD_TEXT;
3459 console_blanked = 0;
3460 if (vc->vc_sw->con_debug_enter)
3461 ret = vc->vc_sw->con_debug_enter(vc);
3462 #ifdef CONFIG_KGDB_KDB
3463 /* Set the initial LINES variable if it is not already set */
3464 if (vc->vc_rows < 999) {
3465 int linecount;
3466 char lns[4];
3467 const char *setargs[3] = {
3468 "set",
3469 "LINES",
3470 lns,
3471 };
3472 if (kdbgetintenv(setargs[0], &linecount)) {
3473 snprintf(lns, 4, "%i", vc->vc_rows);
3474 kdb_set(2, setargs);
3475 }
3476 }
3477 #endif /* CONFIG_KGDB_KDB */
3478 return ret;
3479 }
3480 EXPORT_SYMBOL_GPL(con_debug_enter);
3481
3482 /**
3483 * con_debug_leave - restore console state
3484 * @sw: console driver
3485 *
3486 * Restore the console state to what it was before the kernel debugger
3487 * was invoked.
3488 *
3489 * RETURNS:
3490 * Zero on success, nonzero if a failure occurred when trying to restore
3491 * the console.
3492 */
3493 int con_debug_leave(void)
3494 {
3495 struct vc_data *vc;
3496 int ret = 0;
3497
3498 fg_console = saved_fg_console;
3499 last_console = saved_last_console;
3500 want_console = saved_want_console;
3501 console_blanked = saved_console_blanked;
3502 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3503
3504 vc = vc_cons[fg_console].d;
3505 if (vc->vc_sw->con_debug_leave)
3506 ret = vc->vc_sw->con_debug_leave(vc);
3507 return ret;
3508 }
3509 EXPORT_SYMBOL_GPL(con_debug_leave);
3510
3511 /**
3512 * register_con_driver - register console driver to console layer
3513 * @csw: console driver
3514 * @first: the first console to take over, minimum value is 0
3515 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3516 *
3517 * DESCRIPTION: This function registers a console driver which can later
3518 * bind to a range of consoles specified by @first and @last. It will
3519 * also initialize the console driver by calling con_startup().
3520 */
3521 int register_con_driver(const struct consw *csw, int first, int last)
3522 {
3523 struct module *owner = csw->owner;
3524 struct con_driver *con_driver;
3525 const char *desc;
3526 int i, retval = 0;
3527
3528 if (!try_module_get(owner))
3529 return -ENODEV;
3530
3531 console_lock();
3532
3533 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3534 con_driver = &registered_con_driver[i];
3535
3536 /* already registered */
3537 if (con_driver->con == csw)
3538 retval = -EBUSY;
3539 }
3540
3541 if (retval)
3542 goto err;
3543
3544 desc = csw->con_startup();
3545
3546 if (!desc)
3547 goto err;
3548
3549 retval = -EINVAL;
3550
3551 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3552 con_driver = &registered_con_driver[i];
3553
3554 if (con_driver->con == NULL) {
3555 con_driver->con = csw;
3556 con_driver->desc = desc;
3557 con_driver->node = i;
3558 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3559 CON_DRIVER_FLAG_INIT;
3560 con_driver->first = first;
3561 con_driver->last = last;
3562 retval = 0;
3563 break;
3564 }
3565 }
3566
3567 if (retval)
3568 goto err;
3569
3570 con_driver->dev = device_create(vtconsole_class, NULL,
3571 MKDEV(0, con_driver->node),
3572 NULL, "vtcon%i",
3573 con_driver->node);
3574
3575 if (IS_ERR(con_driver->dev)) {
3576 printk(KERN_WARNING "Unable to create device for %s; "
3577 "errno = %ld\n", con_driver->desc,
3578 PTR_ERR(con_driver->dev));
3579 con_driver->dev = NULL;
3580 } else {
3581 vtconsole_init_device(con_driver);
3582 }
3583
3584 err:
3585 console_unlock();
3586 module_put(owner);
3587 return retval;
3588 }
3589 EXPORT_SYMBOL(register_con_driver);
3590
3591 /**
3592 * unregister_con_driver - unregister console driver from console layer
3593 * @csw: console driver
3594 *
3595 * DESCRIPTION: All drivers that registers to the console layer must
3596 * call this function upon exit, or if the console driver is in a state
3597 * where it won't be able to handle console services, such as the
3598 * framebuffer console without loaded framebuffer drivers.
3599 *
3600 * The driver must unbind first prior to unregistration.
3601 */
3602 int unregister_con_driver(const struct consw *csw)
3603 {
3604 int i, retval = -ENODEV;
3605
3606 console_lock();
3607
3608 /* cannot unregister a bound driver */
3609 if (con_is_bound(csw))
3610 goto err;
3611
3612 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3613 struct con_driver *con_driver = &registered_con_driver[i];
3614
3615 if (con_driver->con == csw &&
3616 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3617 vtconsole_deinit_device(con_driver);
3618 device_destroy(vtconsole_class,
3619 MKDEV(0, con_driver->node));
3620 con_driver->con = NULL;
3621 con_driver->desc = NULL;
3622 con_driver->dev = NULL;
3623 con_driver->node = 0;
3624 con_driver->flag = 0;
3625 con_driver->first = 0;
3626 con_driver->last = 0;
3627 retval = 0;
3628 break;
3629 }
3630 }
3631 err:
3632 console_unlock();
3633 return retval;
3634 }
3635 EXPORT_SYMBOL(unregister_con_driver);
3636
3637 /*
3638 * If we support more console drivers, this function is used
3639 * when a driver wants to take over some existing consoles
3640 * and become default driver for newly opened ones.
3641 *
3642 * take_over_console is basically a register followed by unbind
3643 */
3644 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3645 {
3646 int err;
3647
3648 err = register_con_driver(csw, first, last);
3649 /* if we get an busy error we still want to bind the console driver
3650 * and return success, as we may have unbound the console driver
3651  * but not unregistered it.
3652 */
3653 if (err == -EBUSY)
3654 err = 0;
3655 if (!err)
3656 bind_con_driver(csw, first, last, deflt);
3657
3658 return err;
3659 }
3660
3661 /*
3662 * give_up_console is a wrapper to unregister_con_driver. It will only
3663 * work if driver is fully unbound.
3664 */
3665 void give_up_console(const struct consw *csw)
3666 {
3667 unregister_con_driver(csw);
3668 }
3669
3670 static int __init vtconsole_class_init(void)
3671 {
3672 int i;
3673
3674 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3675 if (IS_ERR(vtconsole_class)) {
3676 printk(KERN_WARNING "Unable to create vt console class; "
3677 "errno = %ld\n", PTR_ERR(vtconsole_class));
3678 vtconsole_class = NULL;
3679 }
3680
3681 /* Add system drivers to sysfs */
3682 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3683 struct con_driver *con = &registered_con_driver[i];
3684
3685 if (con->con && !con->dev) {
3686 con->dev = device_create(vtconsole_class, NULL,
3687 MKDEV(0, con->node),
3688 NULL, "vtcon%i",
3689 con->node);
3690
3691 if (IS_ERR(con->dev)) {
3692 printk(KERN_WARNING "Unable to create "
3693 "device for %s; errno = %ld\n",
3694 con->desc, PTR_ERR(con->dev));
3695 con->dev = NULL;
3696 } else {
3697 vtconsole_init_device(con);
3698 }
3699 }
3700 }
3701
3702 return 0;
3703 }
3704 postcore_initcall(vtconsole_class_init);
3705
3706 #endif
3707
3708 /*
3709 * Screen blanking
3710 */
3711
3712 static int set_vesa_blanking(char __user *p)
3713 {
3714 unsigned int mode;
3715
3716 if (get_user(mode, p + 1))
3717 return -EFAULT;
3718
3719 vesa_blank_mode = (mode < 4) ? mode : 0;
3720 return 0;
3721 }
3722
3723 void do_blank_screen(int entering_gfx)
3724 {
3725 struct vc_data *vc = vc_cons[fg_console].d;
3726 int i;
3727
3728 WARN_CONSOLE_UNLOCKED();
3729
3730 if (console_blanked) {
3731 if (blank_state == blank_vesa_wait) {
3732 blank_state = blank_off;
3733 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3734 }
3735 return;
3736 }
3737
3738 /* entering graphics mode? */
3739 if (entering_gfx) {
3740 hide_cursor(vc);
3741 save_screen(vc);
3742 vc->vc_sw->con_blank(vc, -1, 1);
3743 console_blanked = fg_console + 1;
3744 blank_state = blank_off;
3745 set_origin(vc);
3746 return;
3747 }
3748
3749 if (blank_state != blank_normal_wait)
3750 return;
3751 blank_state = blank_off;
3752
3753 /* don't blank graphics */
3754 if (vc->vc_mode != KD_TEXT) {
3755 console_blanked = fg_console + 1;
3756 return;
3757 }
3758
3759 hide_cursor(vc);
3760 del_timer_sync(&console_timer);
3761 blank_timer_expired = 0;
3762
3763 save_screen(vc);
3764 /* In case we need to reset origin, blanking hook returns 1 */
3765 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3766 console_blanked = fg_console + 1;
3767 if (i)
3768 set_origin(vc);
3769
3770 if (console_blank_hook && console_blank_hook(1))
3771 return;
3772
3773 if (vesa_off_interval && vesa_blank_mode) {
3774 blank_state = blank_vesa_wait;
3775 mod_timer(&console_timer, jiffies + vesa_off_interval);
3776 }
3777 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3778 }
3779 EXPORT_SYMBOL(do_blank_screen);
3780
3781 /*
3782 * Called by timer as well as from vt_console_driver
3783 */
3784 void do_unblank_screen(int leaving_gfx)
3785 {
3786 struct vc_data *vc;
3787
3788 /* This should now always be called from a "sane" (read: can schedule)
3789 * context for the sake of the low level drivers, except in the special
3790 * case of oops_in_progress
3791 */
3792 if (!oops_in_progress)
3793 might_sleep();
3794
3795 WARN_CONSOLE_UNLOCKED();
3796
3797 ignore_poke = 0;
3798 if (!console_blanked)
3799 return;
3800 if (!vc_cons_allocated(fg_console)) {
3801 /* impossible */
3802 pr_warning("unblank_screen: tty %d not allocated ??\n",
3803 fg_console+1);
3804 return;
3805 }
3806 vc = vc_cons[fg_console].d;
3807 /* Try to unblank in oops case too */
3808 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3809 return; /* but leave console_blanked != 0 */
3810
3811 if (blankinterval) {
3812 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3813 blank_state = blank_normal_wait;
3814 }
3815
3816 console_blanked = 0;
3817 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3818 /* Low-level driver cannot restore -> do it ourselves */
3819 update_screen(vc);
3820 if (console_blank_hook)
3821 console_blank_hook(0);
3822 set_palette(vc);
3823 set_cursor(vc);
3824 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3825 }
3826 EXPORT_SYMBOL(do_unblank_screen);
3827
3828 /*
3829 * This is called by the outside world to cause a forced unblank, mostly for
3830 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3831 * call it with 1 as an argument and so force a mode restore... that may kill
3832 * X or at least garbage the screen but would also make the Oops visible...
3833 */
3834 void unblank_screen(void)
3835 {
3836 do_unblank_screen(0);
3837 }
3838
3839 /*
3840 * We defer the timer blanking to work queue so it can take the console mutex
3841 * (console operations can still happen at irq time, but only from printk which
3842 * has the console mutex. Not perfect yet, but better than no locking
3843 */
3844 static void blank_screen_t(unsigned long dummy)
3845 {
3846 if (unlikely(!keventd_up())) {
3847 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3848 return;
3849 }
3850 blank_timer_expired = 1;
3851 schedule_work(&console_work);
3852 }
3853
3854 void poke_blanked_console(void)
3855 {
3856 WARN_CONSOLE_UNLOCKED();
3857
3858 /* Add this so we quickly catch whoever might call us in a non
3859 * safe context. Nowadays, unblank_screen() isn't to be called in
3860 * atomic contexts and is allowed to schedule (with the special case
3861 * of oops_in_progress, but that isn't of any concern for this
3862 * function. --BenH.
3863 */
3864 might_sleep();
3865
3866 /* This isn't perfectly race free, but a race here would be mostly harmless,
3867 * at worse, we'll do a spurrious blank and it's unlikely
3868 */
3869 del_timer(&console_timer);
3870 blank_timer_expired = 0;
3871
3872 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3873 return;
3874 if (console_blanked)
3875 unblank_screen();
3876 else if (blankinterval) {
3877 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3878 blank_state = blank_normal_wait;
3879 }
3880 }
3881
3882 /*
3883 * Palettes
3884 */
3885
3886 static void set_palette(struct vc_data *vc)
3887 {
3888 WARN_CONSOLE_UNLOCKED();
3889
3890 if (vc->vc_mode != KD_GRAPHICS)
3891 vc->vc_sw->con_set_palette(vc, color_table);
3892 }
3893
3894 static int set_get_cmap(unsigned char __user *arg, int set)
3895 {
3896 int i, j, k;
3897
3898 WARN_CONSOLE_UNLOCKED();
3899
3900 for (i = 0; i < 16; i++)
3901 if (set) {
3902 get_user(default_red[i], arg++);
3903 get_user(default_grn[i], arg++);
3904 get_user(default_blu[i], arg++);
3905 } else {
3906 put_user(default_red[i], arg++);
3907 put_user(default_grn[i], arg++);
3908 put_user(default_blu[i], arg++);
3909 }
3910 if (set) {
3911 for (i = 0; i < MAX_NR_CONSOLES; i++)
3912 if (vc_cons_allocated(i)) {
3913 for (j = k = 0; j < 16; j++) {
3914 vc_cons[i].d->vc_palette[k++] = default_red[j];
3915 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3916 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3917 }
3918 set_palette(vc_cons[i].d);
3919 }
3920 }
3921 return 0;
3922 }
3923
3924 /*
3925 * Load palette into the DAC registers. arg points to a colour
3926 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3927 */
3928
3929 int con_set_cmap(unsigned char __user *arg)
3930 {
3931 int rc;
3932
3933 console_lock();
3934 rc = set_get_cmap (arg,1);
3935 console_unlock();
3936
3937 return rc;
3938 }
3939
3940 int con_get_cmap(unsigned char __user *arg)
3941 {
3942 int rc;
3943
3944 console_lock();
3945 rc = set_get_cmap (arg,0);
3946 console_unlock();
3947
3948 return rc;
3949 }
3950
3951 void reset_palette(struct vc_data *vc)
3952 {
3953 int j, k;
3954 for (j=k=0; j<16; j++) {
3955 vc->vc_palette[k++] = default_red[j];
3956 vc->vc_palette[k++] = default_grn[j];
3957 vc->vc_palette[k++] = default_blu[j];
3958 }
3959 set_palette(vc);
3960 }
3961
3962 /*
3963 * Font switching
3964 *
3965 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3966 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3967 * depending on width) reserved for each character which is kinda wasty, but
3968 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3969 * is up to the actual low-level console-driver convert data into its favorite
3970 * format (maybe we should add a `fontoffset' field to the `display'
3971 * structure so we won't have to convert the fontdata all the time.
3972 * /Jes
3973 */
3974
3975 #define max_font_size 65536
3976
3977 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3978 {
3979 struct console_font font;
3980 int rc = -EINVAL;
3981 int c;
3982
3983 if (vc->vc_mode != KD_TEXT)
3984 return -EINVAL;
3985
3986 if (op->data) {
3987 font.data = kmalloc(max_font_size, GFP_KERNEL);
3988 if (!font.data)
3989 return -ENOMEM;
3990 } else
3991 font.data = NULL;
3992
3993 console_lock();
3994 if (vc->vc_sw->con_font_get)
3995 rc = vc->vc_sw->con_font_get(vc, &font);
3996 else
3997 rc = -ENOSYS;
3998 console_unlock();
3999
4000 if (rc)
4001 goto out;
4002
4003 c = (font.width+7)/8 * 32 * font.charcount;
4004
4005 if (op->data && font.charcount > op->charcount)
4006 rc = -ENOSPC;
4007 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4008 if (font.width > op->width || font.height > op->height)
4009 rc = -ENOSPC;
4010 } else {
4011 if (font.width != 8)
4012 rc = -EIO;
4013 else if ((op->height && font.height > op->height) ||
4014 font.height > 32)
4015 rc = -ENOSPC;
4016 }
4017 if (rc)
4018 goto out;
4019
4020 op->height = font.height;
4021 op->width = font.width;
4022 op->charcount = font.charcount;
4023
4024 if (op->data && copy_to_user(op->data, font.data, c))
4025 rc = -EFAULT;
4026
4027 out:
4028 kfree(font.data);
4029 return rc;
4030 }
4031
4032 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4033 {
4034 struct console_font font;
4035 int rc = -EINVAL;
4036 int size;
4037
4038 if (vc->vc_mode != KD_TEXT)
4039 return -EINVAL;
4040 if (!op->data)
4041 return -EINVAL;
4042 if (op->charcount > 512)
4043 return -EINVAL;
4044 if (!op->height) { /* Need to guess font height [compat] */
4045 int h, i;
4046 u8 __user *charmap = op->data;
4047 u8 tmp;
4048
4049 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4050 so that we can get rid of this soon */
4051 if (!(op->flags & KD_FONT_FLAG_OLD))
4052 return -EINVAL;
4053 for (h = 32; h > 0; h--)
4054 for (i = 0; i < op->charcount; i++) {
4055 if (get_user(tmp, &charmap[32*i+h-1]))
4056 return -EFAULT;
4057 if (tmp)
4058 goto nonzero;
4059 }
4060 return -EINVAL;
4061 nonzero:
4062 op->height = h;
4063 }
4064 if (op->width <= 0 || op->width > 32 || op->height > 32)
4065 return -EINVAL;
4066 size = (op->width+7)/8 * 32 * op->charcount;
4067 if (size > max_font_size)
4068 return -ENOSPC;
4069 font.charcount = op->charcount;
4070 font.height = op->height;
4071 font.width = op->width;
4072 font.data = memdup_user(op->data, size);
4073 if (IS_ERR(font.data))
4074 return PTR_ERR(font.data);
4075 console_lock();
4076 if (vc->vc_sw->con_font_set)
4077 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4078 else
4079 rc = -ENOSYS;
4080 console_unlock();
4081 kfree(font.data);
4082 return rc;
4083 }
4084
4085 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4086 {
4087 struct console_font font = {.width = op->width, .height = op->height};
4088 char name[MAX_FONT_NAME];
4089 char *s = name;
4090 int rc;
4091
4092 if (vc->vc_mode != KD_TEXT)
4093 return -EINVAL;
4094
4095 if (!op->data)
4096 s = NULL;
4097 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4098 return -EFAULT;
4099 else
4100 name[MAX_FONT_NAME - 1] = 0;
4101
4102 console_lock();
4103 if (vc->vc_sw->con_font_default)
4104 rc = vc->vc_sw->con_font_default(vc, &font, s);
4105 else
4106 rc = -ENOSYS;
4107 console_unlock();
4108 if (!rc) {
4109 op->width = font.width;
4110 op->height = font.height;
4111 }
4112 return rc;
4113 }
4114
4115 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4116 {
4117 int con = op->height;
4118 int rc;
4119
4120 if (vc->vc_mode != KD_TEXT)
4121 return -EINVAL;
4122
4123 console_lock();
4124 if (!vc->vc_sw->con_font_copy)
4125 rc = -ENOSYS;
4126 else if (con < 0 || !vc_cons_allocated(con))
4127 rc = -ENOTTY;
4128 else if (con == vc->vc_num) /* nothing to do */
4129 rc = 0;
4130 else
4131 rc = vc->vc_sw->con_font_copy(vc, con);
4132 console_unlock();
4133 return rc;
4134 }
4135
4136 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4137 {
4138 switch (op->op) {
4139 case KD_FONT_OP_SET:
4140 return con_font_set(vc, op);
4141 case KD_FONT_OP_GET:
4142 return con_font_get(vc, op);
4143 case KD_FONT_OP_SET_DEFAULT:
4144 return con_font_default(vc, op);
4145 case KD_FONT_OP_COPY:
4146 return con_font_copy(vc, op);
4147 }
4148 return -ENOSYS;
4149 }
4150
4151 /*
4152 * Interface exported to selection and vcs.
4153 */
4154
4155 /* used by selection */
4156 u16 screen_glyph(struct vc_data *vc, int offset)
4157 {
4158 u16 w = scr_readw(screenpos(vc, offset, 1));
4159 u16 c = w & 0xff;
4160
4161 if (w & vc->vc_hi_font_mask)
4162 c |= 0x100;
4163 return c;
4164 }
4165 EXPORT_SYMBOL_GPL(screen_glyph);
4166
4167 /* used by vcs - note the word offset */
4168 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4169 {
4170 return screenpos(vc, 2 * w_offset, viewed);
4171 }
4172
4173 void getconsxy(struct vc_data *vc, unsigned char *p)
4174 {
4175 p[0] = vc->vc_x;
4176 p[1] = vc->vc_y;
4177 }
4178
4179 void putconsxy(struct vc_data *vc, unsigned char *p)
4180 {
4181 hide_cursor(vc);
4182 gotoxy(vc, p[0], p[1]);
4183 set_cursor(vc);
4184 }
4185
4186 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4187 {
4188 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4189 return softcursor_original;
4190 return scr_readw(org);
4191 }
4192
4193 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4194 {
4195 scr_writew(val, org);
4196 if ((unsigned long)org == vc->vc_pos) {
4197 softcursor_original = -1;
4198 add_softcursor(vc);
4199 }
4200 }
4201
4202 void vcs_scr_updated(struct vc_data *vc)
4203 {
4204 notify_update(vc);
4205 }
4206
4207 /*
4208 * Visible symbols for modules
4209 */
4210
4211 EXPORT_SYMBOL(color_table);
4212 EXPORT_SYMBOL(default_red);
4213 EXPORT_SYMBOL(default_grn);
4214 EXPORT_SYMBOL(default_blu);
4215 EXPORT_SYMBOL(update_region);
4216 EXPORT_SYMBOL(redraw_screen);
4217 EXPORT_SYMBOL(vc_resize);
4218 EXPORT_SYMBOL(fg_console);
4219 EXPORT_SYMBOL(console_blank_hook);
4220 EXPORT_SYMBOL(console_blanked);
4221 EXPORT_SYMBOL(vc_cons);
4222 EXPORT_SYMBOL(global_cursor_default);
4223 #ifndef VT_SINGLE_DRIVER
4224 EXPORT_SYMBOL(take_over_console);
4225 EXPORT_SYMBOL(give_up_console);
4226 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree