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x86, apic: Fix spurious error interrupts triggering on all non-boot APs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / vt.c
blob50faa1fb0f06f57f419e96f5e9c974d6a7d08b70
1 /*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
73 */
74
75 #include <linux/module.h>
76 #include <linux/types.h>
77 #include <linux/sched.h>
78 #include <linux/tty.h>
79 #include <linux/tty_flip.h>
80 #include <linux/kernel.h>
81 #include <linux/string.h>
82 #include <linux/errno.h>
83 #include <linux/kd.h>
84 #include <linux/slab.h>
85 #include <linux/major.h>
86 #include <linux/mm.h>
87 #include <linux/console.h>
88 #include <linux/init.h>
89 #include <linux/mutex.h>
90 #include <linux/vt_kern.h>
91 #include <linux/selection.h>
92 #include <linux/smp_lock.h>
93 #include <linux/tiocl.h>
94 #include <linux/kbd_kern.h>
95 #include <linux/consolemap.h>
96 #include <linux/timer.h>
97 #include <linux/interrupt.h>
98 #include <linux/workqueue.h>
99 #include <linux/pm.h>
100 #include <linux/font.h>
101 #include <linux/bitops.h>
102 #include <linux/notifier.h>
103 #include <linux/device.h>
104 #include <linux/io.h>
105 #include <asm/system.h>
106 #include <linux/uaccess.h>
107
108 #define MAX_NR_CON_DRIVER 16
109
110 #define CON_DRIVER_FLAG_MODULE 1
111 #define CON_DRIVER_FLAG_INIT 2
112 #define CON_DRIVER_FLAG_ATTR 4
113
114 struct con_driver {
115 const struct consw *con;
116 const char *desc;
117 struct device *dev;
118 int node;
119 int first;
120 int last;
121 int flag;
122 };
123
124 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
125 const struct consw *conswitchp;
126
127 /* A bitmap for codes <32. A bit of 1 indicates that the code
128 * corresponding to that bit number invokes some special action
129 * (such as cursor movement) and should not be displayed as a
130 * glyph unless the disp_ctrl mode is explicitly enabled.
131 */
132 #define CTRL_ACTION 0x0d00ff81
133 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
134
135 /*
136 * Here is the default bell parameters: 750HZ, 1/8th of a second
137 */
138 #define DEFAULT_BELL_PITCH 750
139 #define DEFAULT_BELL_DURATION (HZ/8)
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void blank_screen_t(unsigned long dummy);
159 static void set_palette(struct vc_data *vc);
160
161 static int printable; /* Is console ready for printing? */
162 int default_utf8 = true;
163 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
164 int global_cursor_default = -1;
165 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
166
167 static int cur_default = CUR_DEFAULT;
168 module_param(cur_default, int, S_IRUGO | S_IWUSR);
169
170 /*
171 * ignore_poke: don't unblank the screen when things are typed. This is
172 * mainly for the privacy of braille terminal users.
173 */
174 static int ignore_poke;
175
176 int do_poke_blanked_console;
177 int console_blanked;
178
179 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
180 static int vesa_off_interval;
181 static int blankinterval = 10*60;
182 core_param(consoleblank, blankinterval, int, 0444);
183
184 static DECLARE_WORK(console_work, console_callback);
185
186 /*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 */
191 int fg_console;
192 int last_console;
193 int want_console = -1;
194
195 /*
196 * For each existing display, we have a pointer to console currently visible
197 * on that display, allowing consoles other than fg_console to be refreshed
198 * appropriately. Unless the low-level driver supplies its own display_fg
199 * variable, we use this one for the "master display".
200 */
201 static struct vc_data *master_display_fg;
202
203 /*
204 * Unfortunately, we need to delay tty echo when we're currently writing to the
205 * console since the code is (and always was) not re-entrant, so we schedule
206 * all flip requests to process context with schedule-task() and run it from
207 * console_callback().
208 */
209
210 /*
211 * For the same reason, we defer scrollback to the console callback.
212 */
213 static int scrollback_delta;
214
215 /*
216 * Hook so that the power management routines can (un)blank
217 * the console on our behalf.
218 */
219 int (*console_blank_hook)(int);
220
221 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
222 static int blank_state;
223 static int blank_timer_expired;
224 enum {
225 blank_off = 0,
226 blank_normal_wait,
227 blank_vesa_wait,
228 };
229
230 /*
231 * Notifier list for console events.
232 */
233 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
234
235 int register_vt_notifier(struct notifier_block *nb)
236 {
237 return atomic_notifier_chain_register(&vt_notifier_list, nb);
238 }
239 EXPORT_SYMBOL_GPL(register_vt_notifier);
240
241 int unregister_vt_notifier(struct notifier_block *nb)
242 {
243 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
244 }
245 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
246
247 static void notify_write(struct vc_data *vc, unsigned int unicode)
248 {
249 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
250 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
251 }
252
253 static void notify_update(struct vc_data *vc)
254 {
255 struct vt_notifier_param param = { .vc = vc };
256 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
257 }
258 /*
259 * Low-Level Functions
260 */
261
262 #define IS_FG(vc) ((vc)->vc_num == fg_console)
263
264 #ifdef VT_BUF_VRAM_ONLY
265 #define DO_UPDATE(vc) 0
266 #else
267 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
268 #endif
269
270 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
271 {
272 unsigned short *p;
273
274 if (!viewed)
275 p = (unsigned short *)(vc->vc_origin + offset);
276 else if (!vc->vc_sw->con_screen_pos)
277 p = (unsigned short *)(vc->vc_visible_origin + offset);
278 else
279 p = vc->vc_sw->con_screen_pos(vc, offset);
280 return p;
281 }
282
283 static inline void scrolldelta(int lines)
284 {
285 scrollback_delta += lines;
286 schedule_console_callback();
287 }
288
289 void schedule_console_callback(void)
290 {
291 schedule_work(&console_work);
292 }
293
294 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
295 {
296 unsigned short *d, *s;
297
298 if (t+nr >= b)
299 nr = b - t - 1;
300 if (b > vc->vc_rows || t >= b || nr < 1)
301 return;
302 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
303 return;
304 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
305 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
306 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
307 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
308 vc->vc_size_row * nr);
309 }
310
311 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
312 {
313 unsigned short *s;
314 unsigned int step;
315
316 if (t+nr >= b)
317 nr = b - t - 1;
318 if (b > vc->vc_rows || t >= b || nr < 1)
319 return;
320 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
321 return;
322 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
323 step = vc->vc_cols * nr;
324 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
325 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
326 }
327
328 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
329 {
330 #ifndef VT_BUF_VRAM_ONLY
331 unsigned int xx, yy, offset;
332 u16 *p;
333
334 p = (u16 *) start;
335 if (!vc->vc_sw->con_getxy) {
336 offset = (start - vc->vc_origin) / 2;
337 xx = offset % vc->vc_cols;
338 yy = offset / vc->vc_cols;
339 } else {
340 int nxx, nyy;
341 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
342 xx = nxx; yy = nyy;
343 }
344 for(;;) {
345 u16 attrib = scr_readw(p) & 0xff00;
346 int startx = xx;
347 u16 *q = p;
348 while (xx < vc->vc_cols && count) {
349 if (attrib != (scr_readw(p) & 0xff00)) {
350 if (p > q)
351 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
352 startx = xx;
353 q = p;
354 attrib = scr_readw(p) & 0xff00;
355 }
356 p++;
357 xx++;
358 count--;
359 }
360 if (p > q)
361 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
362 if (!count)
363 break;
364 xx = 0;
365 yy++;
366 if (vc->vc_sw->con_getxy) {
367 p = (u16 *)start;
368 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
369 }
370 }
371 #endif
372 }
373
374 void update_region(struct vc_data *vc, unsigned long start, int count)
375 {
376 WARN_CONSOLE_UNLOCKED();
377
378 if (DO_UPDATE(vc)) {
379 hide_cursor(vc);
380 do_update_region(vc, start, count);
381 set_cursor(vc);
382 }
383 }
384
385 /* Structure of attributes is hardware-dependent */
386
387 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
388 u8 _underline, u8 _reverse, u8 _italic)
389 {
390 if (vc->vc_sw->con_build_attr)
391 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
392 _blink, _underline, _reverse, _italic);
393
394 #ifndef VT_BUF_VRAM_ONLY
395 /*
396 * ++roman: I completely changed the attribute format for monochrome
397 * mode (!can_do_color). The formerly used MDA (monochrome display
398 * adapter) format didn't allow the combination of certain effects.
399 * Now the attribute is just a bit vector:
400 * Bit 0..1: intensity (0..2)
401 * Bit 2 : underline
402 * Bit 3 : reverse
403 * Bit 7 : blink
404 */
405 {
406 u8 a = _color;
407 if (!vc->vc_can_do_color)
408 return _intensity |
409 (_italic ? 2 : 0) |
410 (_underline ? 4 : 0) |
411 (_reverse ? 8 : 0) |
412 (_blink ? 0x80 : 0);
413 if (_italic)
414 a = (a & 0xF0) | vc->vc_itcolor;
415 else if (_underline)
416 a = (a & 0xf0) | vc->vc_ulcolor;
417 else if (_intensity == 0)
418 a = (a & 0xf0) | vc->vc_ulcolor;
419 if (_reverse)
420 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
421 if (_blink)
422 a ^= 0x80;
423 if (_intensity == 2)
424 a ^= 0x08;
425 if (vc->vc_hi_font_mask == 0x100)
426 a <<= 1;
427 return a;
428 }
429 #else
430 return 0;
431 #endif
432 }
433
434 static void update_attr(struct vc_data *vc)
435 {
436 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
437 vc->vc_blink, vc->vc_underline,
438 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
439 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
440 }
441
442 /* Note: inverting the screen twice should revert to the original state */
443 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
444 {
445 unsigned short *p;
446
447 WARN_CONSOLE_UNLOCKED();
448
449 count /= 2;
450 p = screenpos(vc, offset, viewed);
451 if (vc->vc_sw->con_invert_region)
452 vc->vc_sw->con_invert_region(vc, p, count);
453 #ifndef VT_BUF_VRAM_ONLY
454 else {
455 u16 *q = p;
456 int cnt = count;
457 u16 a;
458
459 if (!vc->vc_can_do_color) {
460 while (cnt--) {
461 a = scr_readw(q);
462 a ^= 0x0800;
463 scr_writew(a, q);
464 q++;
465 }
466 } else if (vc->vc_hi_font_mask == 0x100) {
467 while (cnt--) {
468 a = scr_readw(q);
469 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
470 scr_writew(a, q);
471 q++;
472 }
473 } else {
474 while (cnt--) {
475 a = scr_readw(q);
476 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
477 scr_writew(a, q);
478 q++;
479 }
480 }
481 }
482 #endif
483 if (DO_UPDATE(vc))
484 do_update_region(vc, (unsigned long) p, count);
485 }
486
487 /* used by selection: complement pointer position */
488 void complement_pos(struct vc_data *vc, int offset)
489 {
490 static int old_offset = -1;
491 static unsigned short old;
492 static unsigned short oldx, oldy;
493
494 WARN_CONSOLE_UNLOCKED();
495
496 if (old_offset != -1 && old_offset >= 0 &&
497 old_offset < vc->vc_screenbuf_size) {
498 scr_writew(old, screenpos(vc, old_offset, 1));
499 if (DO_UPDATE(vc))
500 vc->vc_sw->con_putc(vc, old, oldy, oldx);
501 }
502
503 old_offset = offset;
504
505 if (offset != -1 && offset >= 0 &&
506 offset < vc->vc_screenbuf_size) {
507 unsigned short new;
508 unsigned short *p;
509 p = screenpos(vc, offset, 1);
510 old = scr_readw(p);
511 new = old ^ vc->vc_complement_mask;
512 scr_writew(new, p);
513 if (DO_UPDATE(vc)) {
514 oldx = (offset >> 1) % vc->vc_cols;
515 oldy = (offset >> 1) / vc->vc_cols;
516 vc->vc_sw->con_putc(vc, new, oldy, oldx);
517 }
518 }
519
520 }
521
522 static void insert_char(struct vc_data *vc, unsigned int nr)
523 {
524 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
525
526 p = q + vc->vc_cols - nr - vc->vc_x;
527 while (--p >= q)
528 scr_writew(scr_readw(p), p + nr);
529 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
530 vc->vc_need_wrap = 0;
531 if (DO_UPDATE(vc)) {
532 unsigned short oldattr = vc->vc_attr;
533 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
534 vc->vc_cols - vc->vc_x - nr);
535 vc->vc_attr = vc->vc_video_erase_char >> 8;
536 while (nr--)
537 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
538 vc->vc_attr = oldattr;
539 }
540 }
541
542 static void delete_char(struct vc_data *vc, unsigned int nr)
543 {
544 unsigned int i = vc->vc_x;
545 unsigned short *p = (unsigned short *)vc->vc_pos;
546
547 while (++i <= vc->vc_cols - nr) {
548 scr_writew(scr_readw(p+nr), p);
549 p++;
550 }
551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
552 vc->vc_need_wrap = 0;
553 if (DO_UPDATE(vc)) {
554 unsigned short oldattr = vc->vc_attr;
555 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
556 vc->vc_cols - vc->vc_x - nr);
557 vc->vc_attr = vc->vc_video_erase_char >> 8;
558 while (nr--)
559 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
560 vc->vc_cols - 1 - nr);
561 vc->vc_attr = oldattr;
562 }
563 }
564
565 static int softcursor_original;
566
567 static void add_softcursor(struct vc_data *vc)
568 {
569 int i = scr_readw((u16 *) vc->vc_pos);
570 u32 type = vc->vc_cursor_type;
571
572 if (! (type & 0x10)) return;
573 if (softcursor_original != -1) return;
574 softcursor_original = i;
575 i |= ((type >> 8) & 0xff00 );
576 i ^= ((type) & 0xff00 );
577 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
578 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
579 scr_writew(i, (u16 *) vc->vc_pos);
580 if (DO_UPDATE(vc))
581 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
582 }
583
584 static void hide_softcursor(struct vc_data *vc)
585 {
586 if (softcursor_original != -1) {
587 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
588 if (DO_UPDATE(vc))
589 vc->vc_sw->con_putc(vc, softcursor_original,
590 vc->vc_y, vc->vc_x);
591 softcursor_original = -1;
592 }
593 }
594
595 static void hide_cursor(struct vc_data *vc)
596 {
597 if (vc == sel_cons)
598 clear_selection();
599 vc->vc_sw->con_cursor(vc, CM_ERASE);
600 hide_softcursor(vc);
601 }
602
603 static void set_cursor(struct vc_data *vc)
604 {
605 if (!IS_FG(vc) || console_blanked ||
606 vc->vc_mode == KD_GRAPHICS)
607 return;
608 if (vc->vc_deccm) {
609 if (vc == sel_cons)
610 clear_selection();
611 add_softcursor(vc);
612 if ((vc->vc_cursor_type & 0x0f) != 1)
613 vc->vc_sw->con_cursor(vc, CM_DRAW);
614 } else
615 hide_cursor(vc);
616 }
617
618 static void set_origin(struct vc_data *vc)
619 {
620 WARN_CONSOLE_UNLOCKED();
621
622 if (!CON_IS_VISIBLE(vc) ||
623 !vc->vc_sw->con_set_origin ||
624 !vc->vc_sw->con_set_origin(vc))
625 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
626 vc->vc_visible_origin = vc->vc_origin;
627 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
628 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
629 }
630
631 static inline void save_screen(struct vc_data *vc)
632 {
633 WARN_CONSOLE_UNLOCKED();
634
635 if (vc->vc_sw->con_save_screen)
636 vc->vc_sw->con_save_screen(vc);
637 }
638
639 /*
640 * Redrawing of screen
641 */
642
643 static void clear_buffer_attributes(struct vc_data *vc)
644 {
645 unsigned short *p = (unsigned short *)vc->vc_origin;
646 int count = vc->vc_screenbuf_size / 2;
647 int mask = vc->vc_hi_font_mask | 0xff;
648
649 for (; count > 0; count--, p++) {
650 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
651 }
652 }
653
654 void redraw_screen(struct vc_data *vc, int is_switch)
655 {
656 int redraw = 0;
657
658 WARN_CONSOLE_UNLOCKED();
659
660 if (!vc) {
661 /* strange ... */
662 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
663 return;
664 }
665
666 if (is_switch) {
667 struct vc_data *old_vc = vc_cons[fg_console].d;
668 if (old_vc == vc)
669 return;
670 if (!CON_IS_VISIBLE(vc))
671 redraw = 1;
672 *vc->vc_display_fg = vc;
673 fg_console = vc->vc_num;
674 hide_cursor(old_vc);
675 if (!CON_IS_VISIBLE(old_vc)) {
676 save_screen(old_vc);
677 set_origin(old_vc);
678 }
679 } else {
680 hide_cursor(vc);
681 redraw = 1;
682 }
683
684 if (redraw) {
685 int update;
686 int old_was_color = vc->vc_can_do_color;
687
688 set_origin(vc);
689 update = vc->vc_sw->con_switch(vc);
690 set_palette(vc);
691 /*
692 * If console changed from mono<->color, the best we can do
693 * is to clear the buffer attributes. As it currently stands,
694 * rebuilding new attributes from the old buffer is not doable
695 * without overly complex code.
696 */
697 if (old_was_color != vc->vc_can_do_color) {
698 update_attr(vc);
699 clear_buffer_attributes(vc);
700 }
701 if (update && vc->vc_mode != KD_GRAPHICS)
702 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
703 }
704 set_cursor(vc);
705 if (is_switch) {
706 set_leds();
707 compute_shiftstate();
708 notify_update(vc);
709 }
710 }
711
712 /*
713 * Allocation, freeing and resizing of VTs.
714 */
715
716 int vc_cons_allocated(unsigned int i)
717 {
718 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
719 }
720
721 static void visual_init(struct vc_data *vc, int num, int init)
722 {
723 /* ++Geert: vc->vc_sw->con_init determines console size */
724 if (vc->vc_sw)
725 module_put(vc->vc_sw->owner);
726 vc->vc_sw = conswitchp;
727 #ifndef VT_SINGLE_DRIVER
728 if (con_driver_map[num])
729 vc->vc_sw = con_driver_map[num];
730 #endif
731 __module_get(vc->vc_sw->owner);
732 vc->vc_num = num;
733 vc->vc_display_fg = &master_display_fg;
734 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
735 vc->vc_uni_pagedir = 0;
736 vc->vc_hi_font_mask = 0;
737 vc->vc_complement_mask = 0;
738 vc->vc_can_do_color = 0;
739 vc->vc_sw->con_init(vc, init);
740 if (!vc->vc_complement_mask)
741 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
742 vc->vc_s_complement_mask = vc->vc_complement_mask;
743 vc->vc_size_row = vc->vc_cols << 1;
744 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
745 }
746
747 int vc_allocate(unsigned int currcons) /* return 0 on success */
748 {
749 WARN_CONSOLE_UNLOCKED();
750
751 if (currcons >= MAX_NR_CONSOLES)
752 return -ENXIO;
753 if (!vc_cons[currcons].d) {
754 struct vc_data *vc;
755 struct vt_notifier_param param;
756
757 /* prevent users from taking too much memory */
758 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
759 return -EPERM;
760
761 /* due to the granularity of kmalloc, we waste some memory here */
762 /* the alloc is done in two steps, to optimize the common situation
763 of a 25x80 console (structsize=216, screenbuf_size=4000) */
764 /* although the numbers above are not valid since long ago, the
765 point is still up-to-date and the comment still has its value
766 even if only as a historical artifact. --mj, July 1998 */
767 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
768 if (!vc)
769 return -ENOMEM;
770 vc_cons[currcons].d = vc;
771 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
772 visual_init(vc, currcons, 1);
773 if (!*vc->vc_uni_pagedir_loc)
774 con_set_default_unimap(vc);
775 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
776 if (!vc->vc_screenbuf) {
777 kfree(vc);
778 vc_cons[currcons].d = NULL;
779 return -ENOMEM;
780 }
781
782 /* If no drivers have overridden us and the user didn't pass a
783 boot option, default to displaying the cursor */
784 if (global_cursor_default == -1)
785 global_cursor_default = 1;
786
787 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
788 vcs_make_sysfs(currcons);
789 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
790 }
791 return 0;
792 }
793
794 static inline int resize_screen(struct vc_data *vc, int width, int height,
795 int user)
796 {
797 /* Resizes the resolution of the display adapater */
798 int err = 0;
799
800 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
801 err = vc->vc_sw->con_resize(vc, width, height, user);
802
803 return err;
804 }
805
806 /*
807 * Change # of rows and columns (0 means unchanged/the size of fg_console)
808 * [this is to be used together with some user program
809 * like resize that changes the hardware videomode]
810 */
811 #define VC_RESIZE_MAXCOL (32767)
812 #define VC_RESIZE_MAXROW (32767)
813
814 /**
815 * vc_do_resize - resizing method for the tty
816 * @tty: tty being resized
817 * @real_tty: real tty (different to tty if a pty/tty pair)
818 * @vc: virtual console private data
819 * @cols: columns
820 * @lines: lines
821 *
822 * Resize a virtual console, clipping according to the actual constraints.
823 * If the caller passes a tty structure then update the termios winsize
824 * information and perform any neccessary signal handling.
825 *
826 * Caller must hold the console semaphore. Takes the termios mutex and
827 * ctrl_lock of the tty IFF a tty is passed.
828 */
829
830 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
831 unsigned int cols, unsigned int lines)
832 {
833 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
834 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
835 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
836 unsigned int end, user;
837 unsigned short *newscreen;
838
839 WARN_CONSOLE_UNLOCKED();
840
841 if (!vc)
842 return -ENXIO;
843
844 user = vc->vc_resize_user;
845 vc->vc_resize_user = 0;
846
847 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
848 return -EINVAL;
849
850 new_cols = (cols ? cols : vc->vc_cols);
851 new_rows = (lines ? lines : vc->vc_rows);
852 new_row_size = new_cols << 1;
853 new_screen_size = new_row_size * new_rows;
854
855 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
856 return 0;
857
858 newscreen = kmalloc(new_screen_size, GFP_USER);
859 if (!newscreen)
860 return -ENOMEM;
861
862 old_rows = vc->vc_rows;
863 old_cols = vc->vc_cols;
864 old_row_size = vc->vc_size_row;
865 old_screen_size = vc->vc_screenbuf_size;
866
867 err = resize_screen(vc, new_cols, new_rows, user);
868 if (err) {
869 kfree(newscreen);
870 return err;
871 }
872
873 vc->vc_rows = new_rows;
874 vc->vc_cols = new_cols;
875 vc->vc_size_row = new_row_size;
876 vc->vc_screenbuf_size = new_screen_size;
877
878 rlth = min(old_row_size, new_row_size);
879 rrem = new_row_size - rlth;
880 old_origin = vc->vc_origin;
881 new_origin = (long) newscreen;
882 new_scr_end = new_origin + new_screen_size;
883
884 if (vc->vc_y > new_rows) {
885 if (old_rows - vc->vc_y < new_rows) {
886 /*
887 * Cursor near the bottom, copy contents from the
888 * bottom of buffer
889 */
890 old_origin += (old_rows - new_rows) * old_row_size;
891 end = vc->vc_scr_end;
892 } else {
893 /*
894 * Cursor is in no man's land, copy 1/2 screenful
895 * from the top and bottom of cursor position
896 */
897 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
898 end = old_origin + (old_row_size * new_rows);
899 }
900 } else
901 /*
902 * Cursor near the top, copy contents from the top of buffer
903 */
904 end = (old_rows > new_rows) ? old_origin +
905 (old_row_size * new_rows) :
906 vc->vc_scr_end;
907
908 update_attr(vc);
909
910 while (old_origin < end) {
911 scr_memcpyw((unsigned short *) new_origin,
912 (unsigned short *) old_origin, rlth);
913 if (rrem)
914 scr_memsetw((void *)(new_origin + rlth),
915 vc->vc_video_erase_char, rrem);
916 old_origin += old_row_size;
917 new_origin += new_row_size;
918 }
919 if (new_scr_end > new_origin)
920 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
921 new_scr_end - new_origin);
922 kfree(vc->vc_screenbuf);
923 vc->vc_screenbuf = newscreen;
924 vc->vc_screenbuf_size = new_screen_size;
925 set_origin(vc);
926
927 /* do part of a reset_terminal() */
928 vc->vc_top = 0;
929 vc->vc_bottom = vc->vc_rows;
930 gotoxy(vc, vc->vc_x, vc->vc_y);
931 save_cur(vc);
932
933 if (tty) {
934 /* Rewrite the requested winsize data with the actual
935 resulting sizes */
936 struct winsize ws;
937 memset(&ws, 0, sizeof(ws));
938 ws.ws_row = vc->vc_rows;
939 ws.ws_col = vc->vc_cols;
940 ws.ws_ypixel = vc->vc_scan_lines;
941 tty_do_resize(tty, &ws);
942 }
943
944 if (CON_IS_VISIBLE(vc))
945 update_screen(vc);
946 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
947 return err;
948 }
949
950 /**
951 * vc_resize - resize a VT
952 * @vc: virtual console
953 * @cols: columns
954 * @rows: rows
955 *
956 * Resize a virtual console as seen from the console end of things. We
957 * use the common vc_do_resize methods to update the structures. The
958 * caller must hold the console sem to protect console internals and
959 * vc->vc_tty
960 */
961
962 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
963 {
964 return vc_do_resize(vc->vc_tty, vc, cols, rows);
965 }
966
967 /**
968 * vt_resize - resize a VT
969 * @tty: tty to resize
970 * @ws: winsize attributes
971 *
972 * Resize a virtual terminal. This is called by the tty layer as we
973 * register our own handler for resizing. The mutual helper does all
974 * the actual work.
975 *
976 * Takes the console sem and the called methods then take the tty
977 * termios_mutex and the tty ctrl_lock in that order.
978 */
979 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
980 {
981 struct vc_data *vc = tty->driver_data;
982 int ret;
983
984 acquire_console_sem();
985 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
986 release_console_sem();
987 return ret;
988 }
989
990 void vc_deallocate(unsigned int currcons)
991 {
992 WARN_CONSOLE_UNLOCKED();
993
994 if (vc_cons_allocated(currcons)) {
995 struct vc_data *vc = vc_cons[currcons].d;
996 struct vt_notifier_param param = { .vc = vc };
997
998 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
999 vcs_remove_sysfs(currcons);
1000 vc->vc_sw->con_deinit(vc);
1001 put_pid(vc->vt_pid);
1002 module_put(vc->vc_sw->owner);
1003 kfree(vc->vc_screenbuf);
1004 if (currcons >= MIN_NR_CONSOLES)
1005 kfree(vc);
1006 vc_cons[currcons].d = NULL;
1007 }
1008 }
1009
1010 /*
1011 * VT102 emulator
1012 */
1013
1014 #define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1015 #define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1016 #define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1017
1018 #define decarm VC_REPEAT
1019 #define decckm VC_CKMODE
1020 #define kbdapplic VC_APPLIC
1021 #define lnm VC_CRLF
1022
1023 /*
1024 * this is what the terminal answers to a ESC-Z or csi0c query.
1025 */
1026 #define VT100ID "\033[?1;2c"
1027 #define VT102ID "\033[?6c"
1028
1029 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1030 8,12,10,14, 9,13,11,15 };
1031
1032 /* the default colour table, for VGA+ colour systems */
1033 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1034 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1035 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1036 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1037 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1038 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1039
1040 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1042 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1043
1044 /*
1045 * gotoxy() must verify all boundaries, because the arguments
1046 * might also be negative. If the given position is out of
1047 * bounds, the cursor is placed at the nearest margin.
1048 */
1049 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1050 {
1051 int min_y, max_y;
1052
1053 if (new_x < 0)
1054 vc->vc_x = 0;
1055 else {
1056 if (new_x >= vc->vc_cols)
1057 vc->vc_x = vc->vc_cols - 1;
1058 else
1059 vc->vc_x = new_x;
1060 }
1061
1062 if (vc->vc_decom) {
1063 min_y = vc->vc_top;
1064 max_y = vc->vc_bottom;
1065 } else {
1066 min_y = 0;
1067 max_y = vc->vc_rows;
1068 }
1069 if (new_y < min_y)
1070 vc->vc_y = min_y;
1071 else if (new_y >= max_y)
1072 vc->vc_y = max_y - 1;
1073 else
1074 vc->vc_y = new_y;
1075 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1076 vc->vc_need_wrap = 0;
1077 }
1078
1079 /* for absolute user moves, when decom is set */
1080 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1081 {
1082 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1083 }
1084
1085 void scrollback(struct vc_data *vc, int lines)
1086 {
1087 if (!lines)
1088 lines = vc->vc_rows / 2;
1089 scrolldelta(-lines);
1090 }
1091
1092 void scrollfront(struct vc_data *vc, int lines)
1093 {
1094 if (!lines)
1095 lines = vc->vc_rows / 2;
1096 scrolldelta(lines);
1097 }
1098
1099 static void lf(struct vc_data *vc)
1100 {
1101 /* don't scroll if above bottom of scrolling region, or
1102 * if below scrolling region
1103 */
1104 if (vc->vc_y + 1 == vc->vc_bottom)
1105 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1106 else if (vc->vc_y < vc->vc_rows - 1) {
1107 vc->vc_y++;
1108 vc->vc_pos += vc->vc_size_row;
1109 }
1110 vc->vc_need_wrap = 0;
1111 notify_write(vc, '\n');
1112 }
1113
1114 static void ri(struct vc_data *vc)
1115 {
1116 /* don't scroll if below top of scrolling region, or
1117 * if above scrolling region
1118 */
1119 if (vc->vc_y == vc->vc_top)
1120 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1121 else if (vc->vc_y > 0) {
1122 vc->vc_y--;
1123 vc->vc_pos -= vc->vc_size_row;
1124 }
1125 vc->vc_need_wrap = 0;
1126 }
1127
1128 static inline void cr(struct vc_data *vc)
1129 {
1130 vc->vc_pos -= vc->vc_x << 1;
1131 vc->vc_need_wrap = vc->vc_x = 0;
1132 notify_write(vc, '\r');
1133 }
1134
1135 static inline void bs(struct vc_data *vc)
1136 {
1137 if (vc->vc_x) {
1138 vc->vc_pos -= 2;
1139 vc->vc_x--;
1140 vc->vc_need_wrap = 0;
1141 notify_write(vc, '\b');
1142 }
1143 }
1144
1145 static inline void del(struct vc_data *vc)
1146 {
1147 /* ignored */
1148 }
1149
1150 static void csi_J(struct vc_data *vc, int vpar)
1151 {
1152 unsigned int count;
1153 unsigned short * start;
1154
1155 switch (vpar) {
1156 case 0: /* erase from cursor to end of display */
1157 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1158 start = (unsigned short *)vc->vc_pos;
1159 if (DO_UPDATE(vc)) {
1160 /* do in two stages */
1161 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1162 vc->vc_cols - vc->vc_x);
1163 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1164 vc->vc_rows - vc->vc_y - 1,
1165 vc->vc_cols);
1166 }
1167 break;
1168 case 1: /* erase from start to cursor */
1169 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1170 start = (unsigned short *)vc->vc_origin;
1171 if (DO_UPDATE(vc)) {
1172 /* do in two stages */
1173 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1174 vc->vc_cols);
1175 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1176 vc->vc_x + 1);
1177 }
1178 break;
1179 case 2: /* erase whole display */
1180 count = vc->vc_cols * vc->vc_rows;
1181 start = (unsigned short *)vc->vc_origin;
1182 if (DO_UPDATE(vc))
1183 vc->vc_sw->con_clear(vc, 0, 0,
1184 vc->vc_rows,
1185 vc->vc_cols);
1186 break;
1187 default:
1188 return;
1189 }
1190 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1191 vc->vc_need_wrap = 0;
1192 }
1193
1194 static void csi_K(struct vc_data *vc, int vpar)
1195 {
1196 unsigned int count;
1197 unsigned short * start;
1198
1199 switch (vpar) {
1200 case 0: /* erase from cursor to end of line */
1201 count = vc->vc_cols - vc->vc_x;
1202 start = (unsigned short *)vc->vc_pos;
1203 if (DO_UPDATE(vc))
1204 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1205 vc->vc_cols - vc->vc_x);
1206 break;
1207 case 1: /* erase from start of line to cursor */
1208 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209 count = vc->vc_x + 1;
1210 if (DO_UPDATE(vc))
1211 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1212 vc->vc_x + 1);
1213 break;
1214 case 2: /* erase whole line */
1215 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216 count = vc->vc_cols;
1217 if (DO_UPDATE(vc))
1218 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1219 vc->vc_cols);
1220 break;
1221 default:
1222 return;
1223 }
1224 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1225 vc->vc_need_wrap = 0;
1226 }
1227
1228 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1229 { /* not vt100? */
1230 int count;
1231
1232 if (!vpar)
1233 vpar++;
1234 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1235
1236 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1237 if (DO_UPDATE(vc))
1238 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1239 vc->vc_need_wrap = 0;
1240 }
1241
1242 static void default_attr(struct vc_data *vc)
1243 {
1244 vc->vc_intensity = 1;
1245 vc->vc_italic = 0;
1246 vc->vc_underline = 0;
1247 vc->vc_reverse = 0;
1248 vc->vc_blink = 0;
1249 vc->vc_color = vc->vc_def_color;
1250 }
1251
1252 /* console_sem is held */
1253 static void csi_m(struct vc_data *vc)
1254 {
1255 int i;
1256
1257 for (i = 0; i <= vc->vc_npar; i++)
1258 switch (vc->vc_par[i]) {
1259 case 0: /* all attributes off */
1260 default_attr(vc);
1261 break;
1262 case 1:
1263 vc->vc_intensity = 2;
1264 break;
1265 case 2:
1266 vc->vc_intensity = 0;
1267 break;
1268 case 3:
1269 vc->vc_italic = 1;
1270 break;
1271 case 4:
1272 vc->vc_underline = 1;
1273 break;
1274 case 5:
1275 vc->vc_blink = 1;
1276 break;
1277 case 7:
1278 vc->vc_reverse = 1;
1279 break;
1280 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1281 * Select primary font, don't display
1282 * control chars if defined, don't set
1283 * bit 8 on output.
1284 */
1285 vc->vc_translate = set_translate(vc->vc_charset == 0
1286 ? vc->vc_G0_charset
1287 : vc->vc_G1_charset, vc);
1288 vc->vc_disp_ctrl = 0;
1289 vc->vc_toggle_meta = 0;
1290 break;
1291 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1292 * Select first alternate font, lets
1293 * chars < 32 be displayed as ROM chars.
1294 */
1295 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1296 vc->vc_disp_ctrl = 1;
1297 vc->vc_toggle_meta = 0;
1298 break;
1299 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1300 * Select second alternate font, toggle
1301 * high bit before displaying as ROM char.
1302 */
1303 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1304 vc->vc_disp_ctrl = 1;
1305 vc->vc_toggle_meta = 1;
1306 break;
1307 case 21:
1308 case 22:
1309 vc->vc_intensity = 1;
1310 break;
1311 case 23:
1312 vc->vc_italic = 0;
1313 break;
1314 case 24:
1315 vc->vc_underline = 0;
1316 break;
1317 case 25:
1318 vc->vc_blink = 0;
1319 break;
1320 case 27:
1321 vc->vc_reverse = 0;
1322 break;
1323 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1324 * Enables underscore, white foreground
1325 * with white underscore (Linux - use
1326 * default foreground).
1327 */
1328 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1329 vc->vc_underline = 1;
1330 break;
1331 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1332 * Disable underline option.
1333 * Reset colour to default? It did this
1334 * before...
1335 */
1336 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1337 vc->vc_underline = 0;
1338 break;
1339 case 49:
1340 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1341 break;
1342 default:
1343 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1344 vc->vc_color = color_table[vc->vc_par[i] - 30]
1345 | (vc->vc_color & 0xf0);
1346 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1347 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1348 | (vc->vc_color & 0x0f);
1349 break;
1350 }
1351 update_attr(vc);
1352 }
1353
1354 static void respond_string(const char *p, struct tty_struct *tty)
1355 {
1356 while (*p) {
1357 tty_insert_flip_char(tty, *p, 0);
1358 p++;
1359 }
1360 con_schedule_flip(tty);
1361 }
1362
1363 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1364 {
1365 char buf[40];
1366
1367 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1368 respond_string(buf, tty);
1369 }
1370
1371 static inline void status_report(struct tty_struct *tty)
1372 {
1373 respond_string("\033[0n", tty); /* Terminal ok */
1374 }
1375
1376 static inline void respond_ID(struct tty_struct * tty)
1377 {
1378 respond_string(VT102ID, tty);
1379 }
1380
1381 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1382 {
1383 char buf[8];
1384
1385 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1386 (char)('!' + mry));
1387 respond_string(buf, tty);
1388 }
1389
1390 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1391 int mouse_reporting(void)
1392 {
1393 return vc_cons[fg_console].d->vc_report_mouse;
1394 }
1395
1396 /* console_sem is held */
1397 static void set_mode(struct vc_data *vc, int on_off)
1398 {
1399 int i;
1400
1401 for (i = 0; i <= vc->vc_npar; i++)
1402 if (vc->vc_ques) {
1403 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1404 case 1: /* Cursor keys send ^[Ox/^[[x */
1405 if (on_off)
1406 set_kbd(vc, decckm);
1407 else
1408 clr_kbd(vc, decckm);
1409 break;
1410 case 3: /* 80/132 mode switch unimplemented */
1411 vc->vc_deccolm = on_off;
1412 #if 0
1413 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1414 /* this alone does not suffice; some user mode
1415 utility has to change the hardware regs */
1416 #endif
1417 break;
1418 case 5: /* Inverted screen on/off */
1419 if (vc->vc_decscnm != on_off) {
1420 vc->vc_decscnm = on_off;
1421 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1422 update_attr(vc);
1423 }
1424 break;
1425 case 6: /* Origin relative/absolute */
1426 vc->vc_decom = on_off;
1427 gotoxay(vc, 0, 0);
1428 break;
1429 case 7: /* Autowrap on/off */
1430 vc->vc_decawm = on_off;
1431 break;
1432 case 8: /* Autorepeat on/off */
1433 if (on_off)
1434 set_kbd(vc, decarm);
1435 else
1436 clr_kbd(vc, decarm);
1437 break;
1438 case 9:
1439 vc->vc_report_mouse = on_off ? 1 : 0;
1440 break;
1441 case 25: /* Cursor on/off */
1442 vc->vc_deccm = on_off;
1443 break;
1444 case 1000:
1445 vc->vc_report_mouse = on_off ? 2 : 0;
1446 break;
1447 }
1448 } else {
1449 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1450 case 3: /* Monitor (display ctrls) */
1451 vc->vc_disp_ctrl = on_off;
1452 break;
1453 case 4: /* Insert Mode on/off */
1454 vc->vc_decim = on_off;
1455 break;
1456 case 20: /* Lf, Enter == CrLf/Lf */
1457 if (on_off)
1458 set_kbd(vc, lnm);
1459 else
1460 clr_kbd(vc, lnm);
1461 break;
1462 }
1463 }
1464 }
1465
1466 /* console_sem is held */
1467 static void setterm_command(struct vc_data *vc)
1468 {
1469 switch(vc->vc_par[0]) {
1470 case 1: /* set color for underline mode */
1471 if (vc->vc_can_do_color &&
1472 vc->vc_par[1] < 16) {
1473 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1474 if (vc->vc_underline)
1475 update_attr(vc);
1476 }
1477 break;
1478 case 2: /* set color for half intensity mode */
1479 if (vc->vc_can_do_color &&
1480 vc->vc_par[1] < 16) {
1481 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1482 if (vc->vc_intensity == 0)
1483 update_attr(vc);
1484 }
1485 break;
1486 case 8: /* store colors as defaults */
1487 vc->vc_def_color = vc->vc_attr;
1488 if (vc->vc_hi_font_mask == 0x100)
1489 vc->vc_def_color >>= 1;
1490 default_attr(vc);
1491 update_attr(vc);
1492 break;
1493 case 9: /* set blanking interval */
1494 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1495 poke_blanked_console();
1496 break;
1497 case 10: /* set bell frequency in Hz */
1498 if (vc->vc_npar >= 1)
1499 vc->vc_bell_pitch = vc->vc_par[1];
1500 else
1501 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1502 break;
1503 case 11: /* set bell duration in msec */
1504 if (vc->vc_npar >= 1)
1505 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1506 vc->vc_par[1] * HZ / 1000 : 0;
1507 else
1508 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1509 break;
1510 case 12: /* bring specified console to the front */
1511 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1512 set_console(vc->vc_par[1] - 1);
1513 break;
1514 case 13: /* unblank the screen */
1515 poke_blanked_console();
1516 break;
1517 case 14: /* set vesa powerdown interval */
1518 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1519 break;
1520 case 15: /* activate the previous console */
1521 set_console(last_console);
1522 break;
1523 }
1524 }
1525
1526 /* console_sem is held */
1527 static void csi_at(struct vc_data *vc, unsigned int nr)
1528 {
1529 if (nr > vc->vc_cols - vc->vc_x)
1530 nr = vc->vc_cols - vc->vc_x;
1531 else if (!nr)
1532 nr = 1;
1533 insert_char(vc, nr);
1534 }
1535
1536 /* console_sem is held */
1537 static void csi_L(struct vc_data *vc, unsigned int nr)
1538 {
1539 if (nr > vc->vc_rows - vc->vc_y)
1540 nr = vc->vc_rows - vc->vc_y;
1541 else if (!nr)
1542 nr = 1;
1543 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1544 vc->vc_need_wrap = 0;
1545 }
1546
1547 /* console_sem is held */
1548 static void csi_P(struct vc_data *vc, unsigned int nr)
1549 {
1550 if (nr > vc->vc_cols - vc->vc_x)
1551 nr = vc->vc_cols - vc->vc_x;
1552 else if (!nr)
1553 nr = 1;
1554 delete_char(vc, nr);
1555 }
1556
1557 /* console_sem is held */
1558 static void csi_M(struct vc_data *vc, unsigned int nr)
1559 {
1560 if (nr > vc->vc_rows - vc->vc_y)
1561 nr = vc->vc_rows - vc->vc_y;
1562 else if (!nr)
1563 nr=1;
1564 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1565 vc->vc_need_wrap = 0;
1566 }
1567
1568 /* console_sem is held (except via vc_init->reset_terminal */
1569 static void save_cur(struct vc_data *vc)
1570 {
1571 vc->vc_saved_x = vc->vc_x;
1572 vc->vc_saved_y = vc->vc_y;
1573 vc->vc_s_intensity = vc->vc_intensity;
1574 vc->vc_s_italic = vc->vc_italic;
1575 vc->vc_s_underline = vc->vc_underline;
1576 vc->vc_s_blink = vc->vc_blink;
1577 vc->vc_s_reverse = vc->vc_reverse;
1578 vc->vc_s_charset = vc->vc_charset;
1579 vc->vc_s_color = vc->vc_color;
1580 vc->vc_saved_G0 = vc->vc_G0_charset;
1581 vc->vc_saved_G1 = vc->vc_G1_charset;
1582 }
1583
1584 /* console_sem is held */
1585 static void restore_cur(struct vc_data *vc)
1586 {
1587 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1588 vc->vc_intensity = vc->vc_s_intensity;
1589 vc->vc_italic = vc->vc_s_italic;
1590 vc->vc_underline = vc->vc_s_underline;
1591 vc->vc_blink = vc->vc_s_blink;
1592 vc->vc_reverse = vc->vc_s_reverse;
1593 vc->vc_charset = vc->vc_s_charset;
1594 vc->vc_color = vc->vc_s_color;
1595 vc->vc_G0_charset = vc->vc_saved_G0;
1596 vc->vc_G1_charset = vc->vc_saved_G1;
1597 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1598 update_attr(vc);
1599 vc->vc_need_wrap = 0;
1600 }
1601
1602 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1603 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1604 ESpalette };
1605
1606 /* console_sem is held (except via vc_init()) */
1607 static void reset_terminal(struct vc_data *vc, int do_clear)
1608 {
1609 vc->vc_top = 0;
1610 vc->vc_bottom = vc->vc_rows;
1611 vc->vc_state = ESnormal;
1612 vc->vc_ques = 0;
1613 vc->vc_translate = set_translate(LAT1_MAP, vc);
1614 vc->vc_G0_charset = LAT1_MAP;
1615 vc->vc_G1_charset = GRAF_MAP;
1616 vc->vc_charset = 0;
1617 vc->vc_need_wrap = 0;
1618 vc->vc_report_mouse = 0;
1619 vc->vc_utf = default_utf8;
1620 vc->vc_utf_count = 0;
1621
1622 vc->vc_disp_ctrl = 0;
1623 vc->vc_toggle_meta = 0;
1624
1625 vc->vc_decscnm = 0;
1626 vc->vc_decom = 0;
1627 vc->vc_decawm = 1;
1628 vc->vc_deccm = global_cursor_default;
1629 vc->vc_decim = 0;
1630
1631 set_kbd(vc, decarm);
1632 clr_kbd(vc, decckm);
1633 clr_kbd(vc, kbdapplic);
1634 clr_kbd(vc, lnm);
1635 kbd_table[vc->vc_num].lockstate = 0;
1636 kbd_table[vc->vc_num].slockstate = 0;
1637 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1638 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1639 /* do not do set_leds here because this causes an endless tasklet loop
1640 when the keyboard hasn't been initialized yet */
1641
1642 vc->vc_cursor_type = cur_default;
1643 vc->vc_complement_mask = vc->vc_s_complement_mask;
1644
1645 default_attr(vc);
1646 update_attr(vc);
1647
1648 vc->vc_tab_stop[0] = 0x01010100;
1649 vc->vc_tab_stop[1] =
1650 vc->vc_tab_stop[2] =
1651 vc->vc_tab_stop[3] =
1652 vc->vc_tab_stop[4] =
1653 vc->vc_tab_stop[5] =
1654 vc->vc_tab_stop[6] =
1655 vc->vc_tab_stop[7] = 0x01010101;
1656
1657 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1658 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1659
1660 gotoxy(vc, 0, 0);
1661 save_cur(vc);
1662 if (do_clear)
1663 csi_J(vc, 2);
1664 }
1665
1666 /* console_sem is held */
1667 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1668 {
1669 /*
1670 * Control characters can be used in the _middle_
1671 * of an escape sequence.
1672 */
1673 switch (c) {
1674 case 0:
1675 return;
1676 case 7:
1677 if (vc->vc_bell_duration)
1678 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1679 return;
1680 case 8:
1681 bs(vc);
1682 return;
1683 case 9:
1684 vc->vc_pos -= (vc->vc_x << 1);
1685 while (vc->vc_x < vc->vc_cols - 1) {
1686 vc->vc_x++;
1687 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1688 break;
1689 }
1690 vc->vc_pos += (vc->vc_x << 1);
1691 notify_write(vc, '\t');
1692 return;
1693 case 10: case 11: case 12:
1694 lf(vc);
1695 if (!is_kbd(vc, lnm))
1696 return;
1697 case 13:
1698 cr(vc);
1699 return;
1700 case 14:
1701 vc->vc_charset = 1;
1702 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1703 vc->vc_disp_ctrl = 1;
1704 return;
1705 case 15:
1706 vc->vc_charset = 0;
1707 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1708 vc->vc_disp_ctrl = 0;
1709 return;
1710 case 24: case 26:
1711 vc->vc_state = ESnormal;
1712 return;
1713 case 27:
1714 vc->vc_state = ESesc;
1715 return;
1716 case 127:
1717 del(vc);
1718 return;
1719 case 128+27:
1720 vc->vc_state = ESsquare;
1721 return;
1722 }
1723 switch(vc->vc_state) {
1724 case ESesc:
1725 vc->vc_state = ESnormal;
1726 switch (c) {
1727 case '[':
1728 vc->vc_state = ESsquare;
1729 return;
1730 case ']':
1731 vc->vc_state = ESnonstd;
1732 return;
1733 case '%':
1734 vc->vc_state = ESpercent;
1735 return;
1736 case 'E':
1737 cr(vc);
1738 lf(vc);
1739 return;
1740 case 'M':
1741 ri(vc);
1742 return;
1743 case 'D':
1744 lf(vc);
1745 return;
1746 case 'H':
1747 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1748 return;
1749 case 'Z':
1750 respond_ID(tty);
1751 return;
1752 case '7':
1753 save_cur(vc);
1754 return;
1755 case '8':
1756 restore_cur(vc);
1757 return;
1758 case '(':
1759 vc->vc_state = ESsetG0;
1760 return;
1761 case ')':
1762 vc->vc_state = ESsetG1;
1763 return;
1764 case '#':
1765 vc->vc_state = EShash;
1766 return;
1767 case 'c':
1768 reset_terminal(vc, 1);
1769 return;
1770 case '>': /* Numeric keypad */
1771 clr_kbd(vc, kbdapplic);
1772 return;
1773 case '=': /* Appl. keypad */
1774 set_kbd(vc, kbdapplic);
1775 return;
1776 }
1777 return;
1778 case ESnonstd:
1779 if (c=='P') { /* palette escape sequence */
1780 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1781 vc->vc_par[vc->vc_npar] = 0;
1782 vc->vc_npar = 0;
1783 vc->vc_state = ESpalette;
1784 return;
1785 } else if (c=='R') { /* reset palette */
1786 reset_palette(vc);
1787 vc->vc_state = ESnormal;
1788 } else
1789 vc->vc_state = ESnormal;
1790 return;
1791 case ESpalette:
1792 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1793 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1794 if (vc->vc_npar == 7) {
1795 int i = vc->vc_par[0] * 3, j = 1;
1796 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1797 vc->vc_palette[i++] += vc->vc_par[j++];
1798 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1799 vc->vc_palette[i++] += vc->vc_par[j++];
1800 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1801 vc->vc_palette[i] += vc->vc_par[j];
1802 set_palette(vc);
1803 vc->vc_state = ESnormal;
1804 }
1805 } else
1806 vc->vc_state = ESnormal;
1807 return;
1808 case ESsquare:
1809 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1810 vc->vc_par[vc->vc_npar] = 0;
1811 vc->vc_npar = 0;
1812 vc->vc_state = ESgetpars;
1813 if (c == '[') { /* Function key */
1814 vc->vc_state=ESfunckey;
1815 return;
1816 }
1817 vc->vc_ques = (c == '?');
1818 if (vc->vc_ques)
1819 return;
1820 case ESgetpars:
1821 if (c == ';' && vc->vc_npar < NPAR - 1) {
1822 vc->vc_npar++;
1823 return;
1824 } else if (c>='0' && c<='9') {
1825 vc->vc_par[vc->vc_npar] *= 10;
1826 vc->vc_par[vc->vc_npar] += c - '0';
1827 return;
1828 } else
1829 vc->vc_state = ESgotpars;
1830 case ESgotpars:
1831 vc->vc_state = ESnormal;
1832 switch(c) {
1833 case 'h':
1834 set_mode(vc, 1);
1835 return;
1836 case 'l':
1837 set_mode(vc, 0);
1838 return;
1839 case 'c':
1840 if (vc->vc_ques) {
1841 if (vc->vc_par[0])
1842 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1843 else
1844 vc->vc_cursor_type = cur_default;
1845 return;
1846 }
1847 break;
1848 case 'm':
1849 if (vc->vc_ques) {
1850 clear_selection();
1851 if (vc->vc_par[0])
1852 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1853 else
1854 vc->vc_complement_mask = vc->vc_s_complement_mask;
1855 return;
1856 }
1857 break;
1858 case 'n':
1859 if (!vc->vc_ques) {
1860 if (vc->vc_par[0] == 5)
1861 status_report(tty);
1862 else if (vc->vc_par[0] == 6)
1863 cursor_report(vc, tty);
1864 }
1865 return;
1866 }
1867 if (vc->vc_ques) {
1868 vc->vc_ques = 0;
1869 return;
1870 }
1871 switch(c) {
1872 case 'G': case '`':
1873 if (vc->vc_par[0])
1874 vc->vc_par[0]--;
1875 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1876 return;
1877 case 'A':
1878 if (!vc->vc_par[0])
1879 vc->vc_par[0]++;
1880 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1881 return;
1882 case 'B': case 'e':
1883 if (!vc->vc_par[0])
1884 vc->vc_par[0]++;
1885 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1886 return;
1887 case 'C': case 'a':
1888 if (!vc->vc_par[0])
1889 vc->vc_par[0]++;
1890 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1891 return;
1892 case 'D':
1893 if (!vc->vc_par[0])
1894 vc->vc_par[0]++;
1895 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1896 return;
1897 case 'E':
1898 if (!vc->vc_par[0])
1899 vc->vc_par[0]++;
1900 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1901 return;
1902 case 'F':
1903 if (!vc->vc_par[0])
1904 vc->vc_par[0]++;
1905 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1906 return;
1907 case 'd':
1908 if (vc->vc_par[0])
1909 vc->vc_par[0]--;
1910 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1911 return;
1912 case 'H': case 'f':
1913 if (vc->vc_par[0])
1914 vc->vc_par[0]--;
1915 if (vc->vc_par[1])
1916 vc->vc_par[1]--;
1917 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1918 return;
1919 case 'J':
1920 csi_J(vc, vc->vc_par[0]);
1921 return;
1922 case 'K':
1923 csi_K(vc, vc->vc_par[0]);
1924 return;
1925 case 'L':
1926 csi_L(vc, vc->vc_par[0]);
1927 return;
1928 case 'M':
1929 csi_M(vc, vc->vc_par[0]);
1930 return;
1931 case 'P':
1932 csi_P(vc, vc->vc_par[0]);
1933 return;
1934 case 'c':
1935 if (!vc->vc_par[0])
1936 respond_ID(tty);
1937 return;
1938 case 'g':
1939 if (!vc->vc_par[0])
1940 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1941 else if (vc->vc_par[0] == 3) {
1942 vc->vc_tab_stop[0] =
1943 vc->vc_tab_stop[1] =
1944 vc->vc_tab_stop[2] =
1945 vc->vc_tab_stop[3] =
1946 vc->vc_tab_stop[4] =
1947 vc->vc_tab_stop[5] =
1948 vc->vc_tab_stop[6] =
1949 vc->vc_tab_stop[7] = 0;
1950 }
1951 return;
1952 case 'm':
1953 csi_m(vc);
1954 return;
1955 case 'q': /* DECLL - but only 3 leds */
1956 /* map 0,1,2,3 to 0,1,2,4 */
1957 if (vc->vc_par[0] < 4)
1958 setledstate(kbd_table + vc->vc_num,
1959 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1960 return;
1961 case 'r':
1962 if (!vc->vc_par[0])
1963 vc->vc_par[0]++;
1964 if (!vc->vc_par[1])
1965 vc->vc_par[1] = vc->vc_rows;
1966 /* Minimum allowed region is 2 lines */
1967 if (vc->vc_par[0] < vc->vc_par[1] &&
1968 vc->vc_par[1] <= vc->vc_rows) {
1969 vc->vc_top = vc->vc_par[0] - 1;
1970 vc->vc_bottom = vc->vc_par[1];
1971 gotoxay(vc, 0, 0);
1972 }
1973 return;
1974 case 's':
1975 save_cur(vc);
1976 return;
1977 case 'u':
1978 restore_cur(vc);
1979 return;
1980 case 'X':
1981 csi_X(vc, vc->vc_par[0]);
1982 return;
1983 case '@':
1984 csi_at(vc, vc->vc_par[0]);
1985 return;
1986 case ']': /* setterm functions */
1987 setterm_command(vc);
1988 return;
1989 }
1990 return;
1991 case ESpercent:
1992 vc->vc_state = ESnormal;
1993 switch (c) {
1994 case '@': /* defined in ISO 2022 */
1995 vc->vc_utf = 0;
1996 return;
1997 case 'G': /* prelim official escape code */
1998 case '8': /* retained for compatibility */
1999 vc->vc_utf = 1;
2000 return;
2001 }
2002 return;
2003 case ESfunckey:
2004 vc->vc_state = ESnormal;
2005 return;
2006 case EShash:
2007 vc->vc_state = ESnormal;
2008 if (c == '8') {
2009 /* DEC screen alignment test. kludge :-) */
2010 vc->vc_video_erase_char =
2011 (vc->vc_video_erase_char & 0xff00) | 'E';
2012 csi_J(vc, 2);
2013 vc->vc_video_erase_char =
2014 (vc->vc_video_erase_char & 0xff00) | ' ';
2015 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2016 }
2017 return;
2018 case ESsetG0:
2019 if (c == '0')
2020 vc->vc_G0_charset = GRAF_MAP;
2021 else if (c == 'B')
2022 vc->vc_G0_charset = LAT1_MAP;
2023 else if (c == 'U')
2024 vc->vc_G0_charset = IBMPC_MAP;
2025 else if (c == 'K')
2026 vc->vc_G0_charset = USER_MAP;
2027 if (vc->vc_charset == 0)
2028 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2029 vc->vc_state = ESnormal;
2030 return;
2031 case ESsetG1:
2032 if (c == '0')
2033 vc->vc_G1_charset = GRAF_MAP;
2034 else if (c == 'B')
2035 vc->vc_G1_charset = LAT1_MAP;
2036 else if (c == 'U')
2037 vc->vc_G1_charset = IBMPC_MAP;
2038 else if (c == 'K')
2039 vc->vc_G1_charset = USER_MAP;
2040 if (vc->vc_charset == 1)
2041 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2042 vc->vc_state = ESnormal;
2043 return;
2044 default:
2045 vc->vc_state = ESnormal;
2046 }
2047 }
2048
2049 /* This is a temporary buffer used to prepare a tty console write
2050 * so that we can easily avoid touching user space while holding the
2051 * console spinlock. It is allocated in con_init and is shared by
2052 * this code and the vc_screen read/write tty calls.
2053 *
2054 * We have to allocate this statically in the kernel data section
2055 * since console_init (and thus con_init) are called before any
2056 * kernel memory allocation is available.
2057 */
2058 char con_buf[CON_BUF_SIZE];
2059 DEFINE_MUTEX(con_buf_mtx);
2060
2061 /* is_double_width() is based on the wcwidth() implementation by
2062 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2063 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2064 */
2065 struct interval {
2066 uint32_t first;
2067 uint32_t last;
2068 };
2069
2070 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2071 {
2072 int min = 0;
2073 int mid;
2074
2075 if (ucs < table[0].first || ucs > table[max].last)
2076 return 0;
2077 while (max >= min) {
2078 mid = (min + max) / 2;
2079 if (ucs > table[mid].last)
2080 min = mid + 1;
2081 else if (ucs < table[mid].first)
2082 max = mid - 1;
2083 else
2084 return 1;
2085 }
2086 return 0;
2087 }
2088
2089 static int is_double_width(uint32_t ucs)
2090 {
2091 static const struct interval double_width[] = {
2092 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2093 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2094 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2095 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2096 };
2097 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2098 }
2099
2100 /* acquires console_sem */
2101 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2102 {
2103 #ifdef VT_BUF_VRAM_ONLY
2104 #define FLUSH do { } while(0);
2105 #else
2106 #define FLUSH if (draw_x >= 0) { \
2107 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2108 draw_x = -1; \
2109 }
2110 #endif
2111
2112 int c, tc, ok, n = 0, draw_x = -1;
2113 unsigned int currcons;
2114 unsigned long draw_from = 0, draw_to = 0;
2115 struct vc_data *vc;
2116 unsigned char vc_attr;
2117 struct vt_notifier_param param;
2118 uint8_t rescan;
2119 uint8_t inverse;
2120 uint8_t width;
2121 u16 himask, charmask;
2122 const unsigned char *orig_buf = NULL;
2123 int orig_count;
2124
2125 if (in_interrupt())
2126 return count;
2127
2128 might_sleep();
2129
2130 acquire_console_sem();
2131 vc = tty->driver_data;
2132 if (vc == NULL) {
2133 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2134 release_console_sem();
2135 return 0;
2136 }
2137
2138 currcons = vc->vc_num;
2139 if (!vc_cons_allocated(currcons)) {
2140 /* could this happen? */
2141 printk_once("con_write: tty %d not allocated\n", currcons+1);
2142 release_console_sem();
2143 return 0;
2144 }
2145 orig_buf = buf;
2146 orig_count = count;
2147
2148 himask = vc->vc_hi_font_mask;
2149 charmask = himask ? 0x1ff : 0xff;
2150
2151 /* undraw cursor first */
2152 if (IS_FG(vc))
2153 hide_cursor(vc);
2154
2155 param.vc = vc;
2156
2157 while (!tty->stopped && count) {
2158 int orig = *buf;
2159 c = orig;
2160 buf++;
2161 n++;
2162 count--;
2163 rescan = 0;
2164 inverse = 0;
2165 width = 1;
2166
2167 /* Do no translation at all in control states */
2168 if (vc->vc_state != ESnormal) {
2169 tc = c;
2170 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2171 /* Combine UTF-8 into Unicode in vc_utf_char.
2172 * vc_utf_count is the number of continuation bytes still
2173 * expected to arrive.
2174 * vc_npar is the number of continuation bytes arrived so
2175 * far
2176 */
2177 rescan_last_byte:
2178 if ((c & 0xc0) == 0x80) {
2179 /* Continuation byte received */
2180 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2181 if (vc->vc_utf_count) {
2182 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2183 vc->vc_npar++;
2184 if (--vc->vc_utf_count) {
2185 /* Still need some bytes */
2186 continue;
2187 }
2188 /* Got a whole character */
2189 c = vc->vc_utf_char;
2190 /* Reject overlong sequences */
2191 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2192 c > utf8_length_changes[vc->vc_npar])
2193 c = 0xfffd;
2194 } else {
2195 /* Unexpected continuation byte */
2196 vc->vc_utf_count = 0;
2197 c = 0xfffd;
2198 }
2199 } else {
2200 /* Single ASCII byte or first byte of a sequence received */
2201 if (vc->vc_utf_count) {
2202 /* Continuation byte expected */
2203 rescan = 1;
2204 vc->vc_utf_count = 0;
2205 c = 0xfffd;
2206 } else if (c > 0x7f) {
2207 /* First byte of a multibyte sequence received */
2208 vc->vc_npar = 0;
2209 if ((c & 0xe0) == 0xc0) {
2210 vc->vc_utf_count = 1;
2211 vc->vc_utf_char = (c & 0x1f);
2212 } else if ((c & 0xf0) == 0xe0) {
2213 vc->vc_utf_count = 2;
2214 vc->vc_utf_char = (c & 0x0f);
2215 } else if ((c & 0xf8) == 0xf0) {
2216 vc->vc_utf_count = 3;
2217 vc->vc_utf_char = (c & 0x07);
2218 } else if ((c & 0xfc) == 0xf8) {
2219 vc->vc_utf_count = 4;
2220 vc->vc_utf_char = (c & 0x03);
2221 } else if ((c & 0xfe) == 0xfc) {
2222 vc->vc_utf_count = 5;
2223 vc->vc_utf_char = (c & 0x01);
2224 } else {
2225 /* 254 and 255 are invalid */
2226 c = 0xfffd;
2227 }
2228 if (vc->vc_utf_count) {
2229 /* Still need some bytes */
2230 continue;
2231 }
2232 }
2233 /* Nothing to do if an ASCII byte was received */
2234 }
2235 /* End of UTF-8 decoding. */
2236 /* c is the received character, or U+FFFD for invalid sequences. */
2237 /* Replace invalid Unicode code points with U+FFFD too */
2238 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2239 c = 0xfffd;
2240 tc = c;
2241 } else { /* no utf or alternate charset mode */
2242 tc = vc_translate(vc, c);
2243 }
2244
2245 param.c = tc;
2246 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2247 &param) == NOTIFY_STOP)
2248 continue;
2249
2250 /* If the original code was a control character we
2251 * only allow a glyph to be displayed if the code is
2252 * not normally used (such as for cursor movement) or
2253 * if the disp_ctrl mode has been explicitly enabled.
2254 * Certain characters (as given by the CTRL_ALWAYS
2255 * bitmap) are always displayed as control characters,
2256 * as the console would be pretty useless without
2257 * them; to display an arbitrary font position use the
2258 * direct-to-font zone in UTF-8 mode.
2259 */
2260 ok = tc && (c >= 32 ||
2261 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2262 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2263 && (c != 127 || vc->vc_disp_ctrl)
2264 && (c != 128+27);
2265
2266 if (vc->vc_state == ESnormal && ok) {
2267 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2268 if (is_double_width(c))
2269 width = 2;
2270 }
2271 /* Now try to find out how to display it */
2272 tc = conv_uni_to_pc(vc, tc);
2273 if (tc & ~charmask) {
2274 if (tc == -1 || tc == -2) {
2275 continue; /* nothing to display */
2276 }
2277 /* Glyph not found */
2278 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2279 /* In legacy mode use the glyph we get by a 1:1 mapping.
2280 This would make absolutely no sense with Unicode in mind,
2281 but do this for ASCII characters since a font may lack
2282 Unicode mapping info and we don't want to end up with
2283 having question marks only. */
2284 tc = c;
2285 } else {
2286 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2287 tc = conv_uni_to_pc(vc, 0xfffd);
2288 if (tc < 0) {
2289 inverse = 1;
2290 tc = conv_uni_to_pc(vc, '?');
2291 if (tc < 0) tc = '?';
2292 }
2293 }
2294 }
2295
2296 if (!inverse) {
2297 vc_attr = vc->vc_attr;
2298 } else {
2299 /* invert vc_attr */
2300 if (!vc->vc_can_do_color) {
2301 vc_attr = (vc->vc_attr) ^ 0x08;
2302 } else if (vc->vc_hi_font_mask == 0x100) {
2303 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2304 } else {
2305 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2306 }
2307 FLUSH
2308 }
2309
2310 while (1) {
2311 if (vc->vc_need_wrap || vc->vc_decim)
2312 FLUSH
2313 if (vc->vc_need_wrap) {
2314 cr(vc);
2315 lf(vc);
2316 }
2317 if (vc->vc_decim)
2318 insert_char(vc, 1);
2319 scr_writew(himask ?
2320 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2321 (vc_attr << 8) + tc,
2322 (u16 *) vc->vc_pos);
2323 if (DO_UPDATE(vc) && draw_x < 0) {
2324 draw_x = vc->vc_x;
2325 draw_from = vc->vc_pos;
2326 }
2327 if (vc->vc_x == vc->vc_cols - 1) {
2328 vc->vc_need_wrap = vc->vc_decawm;
2329 draw_to = vc->vc_pos + 2;
2330 } else {
2331 vc->vc_x++;
2332 draw_to = (vc->vc_pos += 2);
2333 }
2334
2335 if (!--width) break;
2336
2337 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2338 if (tc < 0) tc = ' ';
2339 }
2340 notify_write(vc, c);
2341
2342 if (inverse) {
2343 FLUSH
2344 }
2345
2346 if (rescan) {
2347 rescan = 0;
2348 inverse = 0;
2349 width = 1;
2350 c = orig;
2351 goto rescan_last_byte;
2352 }
2353 continue;
2354 }
2355 FLUSH
2356 do_con_trol(tty, vc, orig);
2357 }
2358 FLUSH
2359 console_conditional_schedule();
2360 release_console_sem();
2361 notify_update(vc);
2362 return n;
2363 #undef FLUSH
2364 }
2365
2366 /*
2367 * This is the console switching callback.
2368 *
2369 * Doing console switching in a process context allows
2370 * us to do the switches asynchronously (needed when we want
2371 * to switch due to a keyboard interrupt). Synchronization
2372 * with other console code and prevention of re-entrancy is
2373 * ensured with console_sem.
2374 */
2375 static void console_callback(struct work_struct *ignored)
2376 {
2377 acquire_console_sem();
2378
2379 if (want_console >= 0) {
2380 if (want_console != fg_console &&
2381 vc_cons_allocated(want_console)) {
2382 hide_cursor(vc_cons[fg_console].d);
2383 change_console(vc_cons[want_console].d);
2384 /* we only changed when the console had already
2385 been allocated - a new console is not created
2386 in an interrupt routine */
2387 }
2388 want_console = -1;
2389 }
2390 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2391 do_poke_blanked_console = 0;
2392 poke_blanked_console();
2393 }
2394 if (scrollback_delta) {
2395 struct vc_data *vc = vc_cons[fg_console].d;
2396 clear_selection();
2397 if (vc->vc_mode == KD_TEXT)
2398 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2399 scrollback_delta = 0;
2400 }
2401 if (blank_timer_expired) {
2402 do_blank_screen(0);
2403 blank_timer_expired = 0;
2404 }
2405 notify_update(vc_cons[fg_console].d);
2406
2407 release_console_sem();
2408 }
2409
2410 int set_console(int nr)
2411 {
2412 struct vc_data *vc = vc_cons[fg_console].d;
2413
2414 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2415 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2416
2417 /*
2418 * Console switch will fail in console_callback() or
2419 * change_console() so there is no point scheduling
2420 * the callback
2421 *
2422 * Existing set_console() users don't check the return
2423 * value so this shouldn't break anything
2424 */
2425 return -EINVAL;
2426 }
2427
2428 want_console = nr;
2429 schedule_console_callback();
2430
2431 return 0;
2432 }
2433
2434 struct tty_driver *console_driver;
2435
2436 #ifdef CONFIG_VT_CONSOLE
2437
2438 /**
2439 * vt_kmsg_redirect() - Sets/gets the kernel message console
2440 * @new: The new virtual terminal number or -1 if the console should stay
2441 * unchanged
2442 *
2443 * By default, the kernel messages are always printed on the current virtual
2444 * console. However, the user may modify that default with the
2445 * TIOCL_SETKMSGREDIRECT ioctl call.
2446 *
2447 * This function sets the kernel message console to be @new. It returns the old
2448 * virtual console number. The virtual terminal number 0 (both as parameter and
2449 * return value) means no redirection (i.e. always printed on the currently
2450 * active console).
2451 *
2452 * The parameter -1 means that only the current console is returned, but the
2453 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2454 * case to make the code more understandable.
2455 *
2456 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2457 * the parameter and always returns 0.
2458 */
2459 int vt_kmsg_redirect(int new)
2460 {
2461 static int kmsg_con;
2462
2463 if (new != -1)
2464 return xchg(&kmsg_con, new);
2465 else
2466 return kmsg_con;
2467 }
2468
2469 /*
2470 * Console on virtual terminal
2471 *
2472 * The console must be locked when we get here.
2473 */
2474
2475 static void vt_console_print(struct console *co, const char *b, unsigned count)
2476 {
2477 struct vc_data *vc = vc_cons[fg_console].d;
2478 unsigned char c;
2479 static DEFINE_SPINLOCK(printing_lock);
2480 const ushort *start;
2481 ushort cnt = 0;
2482 ushort myx;
2483 int kmsg_console;
2484
2485 /* console busy or not yet initialized */
2486 if (!printable)
2487 return;
2488 if (!spin_trylock(&printing_lock))
2489 return;
2490
2491 kmsg_console = vt_get_kmsg_redirect();
2492 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2493 vc = vc_cons[kmsg_console - 1].d;
2494
2495 /* read `x' only after setting currcons properly (otherwise
2496 the `x' macro will read the x of the foreground console). */
2497 myx = vc->vc_x;
2498
2499 if (!vc_cons_allocated(fg_console)) {
2500 /* impossible */
2501 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2502 goto quit;
2503 }
2504
2505 if (vc->vc_mode != KD_TEXT)
2506 goto quit;
2507
2508 /* undraw cursor first */
2509 if (IS_FG(vc))
2510 hide_cursor(vc);
2511
2512 start = (ushort *)vc->vc_pos;
2513
2514 /* Contrived structure to try to emulate original need_wrap behaviour
2515 * Problems caused when we have need_wrap set on '\n' character */
2516 while (count--) {
2517 c = *b++;
2518 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2519 if (cnt > 0) {
2520 if (CON_IS_VISIBLE(vc))
2521 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2522 vc->vc_x += cnt;
2523 if (vc->vc_need_wrap)
2524 vc->vc_x--;
2525 cnt = 0;
2526 }
2527 if (c == 8) { /* backspace */
2528 bs(vc);
2529 start = (ushort *)vc->vc_pos;
2530 myx = vc->vc_x;
2531 continue;
2532 }
2533 if (c != 13)
2534 lf(vc);
2535 cr(vc);
2536 start = (ushort *)vc->vc_pos;
2537 myx = vc->vc_x;
2538 if (c == 10 || c == 13)
2539 continue;
2540 }
2541 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2542 notify_write(vc, c);
2543 cnt++;
2544 if (myx == vc->vc_cols - 1) {
2545 vc->vc_need_wrap = 1;
2546 continue;
2547 }
2548 vc->vc_pos += 2;
2549 myx++;
2550 }
2551 if (cnt > 0) {
2552 if (CON_IS_VISIBLE(vc))
2553 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2554 vc->vc_x += cnt;
2555 if (vc->vc_x == vc->vc_cols) {
2556 vc->vc_x--;
2557 vc->vc_need_wrap = 1;
2558 }
2559 }
2560 set_cursor(vc);
2561 notify_update(vc);
2562
2563 quit:
2564 spin_unlock(&printing_lock);
2565 }
2566
2567 static struct tty_driver *vt_console_device(struct console *c, int *index)
2568 {
2569 *index = c->index ? c->index-1 : fg_console;
2570 return console_driver;
2571 }
2572
2573 static struct console vt_console_driver = {
2574 .name = "tty",
2575 .write = vt_console_print,
2576 .device = vt_console_device,
2577 .unblank = unblank_screen,
2578 .flags = CON_PRINTBUFFER,
2579 .index = -1,
2580 };
2581 #endif
2582
2583 /*
2584 * Handling of Linux-specific VC ioctls
2585 */
2586
2587 /*
2588 * Generally a bit racy with respect to console_sem().
2589 *
2590 * There are some functions which don't need it.
2591 *
2592 * There are some functions which can sleep for arbitrary periods
2593 * (paste_selection) but we don't need the lock there anyway.
2594 *
2595 * set_selection has locking, and definitely needs it
2596 */
2597
2598 int tioclinux(struct tty_struct *tty, unsigned long arg)
2599 {
2600 char type, data;
2601 char __user *p = (char __user *)arg;
2602 int lines;
2603 int ret;
2604
2605 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2606 return -EPERM;
2607 if (get_user(type, p))
2608 return -EFAULT;
2609 ret = 0;
2610
2611 lock_kernel();
2612
2613 switch (type)
2614 {
2615 case TIOCL_SETSEL:
2616 acquire_console_sem();
2617 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2618 release_console_sem();
2619 break;
2620 case TIOCL_PASTESEL:
2621 ret = paste_selection(tty);
2622 break;
2623 case TIOCL_UNBLANKSCREEN:
2624 acquire_console_sem();
2625 unblank_screen();
2626 release_console_sem();
2627 break;
2628 case TIOCL_SELLOADLUT:
2629 ret = sel_loadlut(p);
2630 break;
2631 case TIOCL_GETSHIFTSTATE:
2632
2633 /*
2634 * Make it possible to react to Shift+Mousebutton.
2635 * Note that 'shift_state' is an undocumented
2636 * kernel-internal variable; programs not closely
2637 * related to the kernel should not use this.
2638 */
2639 data = shift_state;
2640 ret = __put_user(data, p);
2641 break;
2642 case TIOCL_GETMOUSEREPORTING:
2643 data = mouse_reporting();
2644 ret = __put_user(data, p);
2645 break;
2646 case TIOCL_SETVESABLANK:
2647 ret = set_vesa_blanking(p);
2648 break;
2649 case TIOCL_GETKMSGREDIRECT:
2650 data = vt_get_kmsg_redirect();
2651 ret = __put_user(data, p);
2652 break;
2653 case TIOCL_SETKMSGREDIRECT:
2654 if (!capable(CAP_SYS_ADMIN)) {
2655 ret = -EPERM;
2656 } else {
2657 if (get_user(data, p+1))
2658 ret = -EFAULT;
2659 else
2660 vt_kmsg_redirect(data);
2661 }
2662 break;
2663 case TIOCL_GETFGCONSOLE:
2664 ret = fg_console;
2665 break;
2666 case TIOCL_SCROLLCONSOLE:
2667 if (get_user(lines, (s32 __user *)(p+4))) {
2668 ret = -EFAULT;
2669 } else {
2670 scrollfront(vc_cons[fg_console].d, lines);
2671 ret = 0;
2672 }
2673 break;
2674 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2675 acquire_console_sem();
2676 ignore_poke = 1;
2677 do_blank_screen(0);
2678 release_console_sem();
2679 break;
2680 case TIOCL_BLANKEDSCREEN:
2681 ret = console_blanked;
2682 break;
2683 default:
2684 ret = -EINVAL;
2685 break;
2686 }
2687 unlock_kernel();
2688 return ret;
2689 }
2690
2691 /*
2692 * /dev/ttyN handling
2693 */
2694
2695 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2696 {
2697 int retval;
2698
2699 retval = do_con_write(tty, buf, count);
2700 con_flush_chars(tty);
2701
2702 return retval;
2703 }
2704
2705 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2706 {
2707 if (in_interrupt())
2708 return 0; /* n_r3964 calls put_char() from interrupt context */
2709 return do_con_write(tty, &ch, 1);
2710 }
2711
2712 static int con_write_room(struct tty_struct *tty)
2713 {
2714 if (tty->stopped)
2715 return 0;
2716 return 32768; /* No limit, really; we're not buffering */
2717 }
2718
2719 static int con_chars_in_buffer(struct tty_struct *tty)
2720 {
2721 return 0; /* we're not buffering */
2722 }
2723
2724 /*
2725 * con_throttle and con_unthrottle are only used for
2726 * paste_selection(), which has to stuff in a large number of
2727 * characters...
2728 */
2729 static void con_throttle(struct tty_struct *tty)
2730 {
2731 }
2732
2733 static void con_unthrottle(struct tty_struct *tty)
2734 {
2735 struct vc_data *vc = tty->driver_data;
2736
2737 wake_up_interruptible(&vc->paste_wait);
2738 }
2739
2740 /*
2741 * Turn the Scroll-Lock LED on when the tty is stopped
2742 */
2743 static void con_stop(struct tty_struct *tty)
2744 {
2745 int console_num;
2746 if (!tty)
2747 return;
2748 console_num = tty->index;
2749 if (!vc_cons_allocated(console_num))
2750 return;
2751 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2752 set_leds();
2753 }
2754
2755 /*
2756 * Turn the Scroll-Lock LED off when the console is started
2757 */
2758 static void con_start(struct tty_struct *tty)
2759 {
2760 int console_num;
2761 if (!tty)
2762 return;
2763 console_num = tty->index;
2764 if (!vc_cons_allocated(console_num))
2765 return;
2766 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2767 set_leds();
2768 }
2769
2770 static void con_flush_chars(struct tty_struct *tty)
2771 {
2772 struct vc_data *vc;
2773
2774 if (in_interrupt()) /* from flush_to_ldisc */
2775 return;
2776
2777 /* if we race with con_close(), vt may be null */
2778 acquire_console_sem();
2779 vc = tty->driver_data;
2780 if (vc)
2781 set_cursor(vc);
2782 release_console_sem();
2783 }
2784
2785 /*
2786 * Allocate the console screen memory.
2787 */
2788 static int con_open(struct tty_struct *tty, struct file *filp)
2789 {
2790 unsigned int currcons = tty->index;
2791 int ret = 0;
2792
2793 acquire_console_sem();
2794 if (tty->driver_data == NULL) {
2795 ret = vc_allocate(currcons);
2796 if (ret == 0) {
2797 struct vc_data *vc = vc_cons[currcons].d;
2798
2799 /* Still being freed */
2800 if (vc->vc_tty) {
2801 release_console_sem();
2802 return -ERESTARTSYS;
2803 }
2804 tty->driver_data = vc;
2805 vc->vc_tty = tty;
2806
2807 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2808 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2809 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2810 }
2811 if (vc->vc_utf)
2812 tty->termios->c_iflag |= IUTF8;
2813 else
2814 tty->termios->c_iflag &= ~IUTF8;
2815 release_console_sem();
2816 return ret;
2817 }
2818 }
2819 release_console_sem();
2820 return ret;
2821 }
2822
2823 static void con_close(struct tty_struct *tty, struct file *filp)
2824 {
2825 /* Nothing to do - we defer to shutdown */
2826 }
2827
2828 static void con_shutdown(struct tty_struct *tty)
2829 {
2830 struct vc_data *vc = tty->driver_data;
2831 BUG_ON(vc == NULL);
2832 acquire_console_sem();
2833 vc->vc_tty = NULL;
2834 release_console_sem();
2835 tty_shutdown(tty);
2836 }
2837
2838 static int default_italic_color = 2; // green (ASCII)
2839 static int default_underline_color = 3; // cyan (ASCII)
2840 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2841 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2842
2843 static void vc_init(struct vc_data *vc, unsigned int rows,
2844 unsigned int cols, int do_clear)
2845 {
2846 int j, k ;
2847
2848 vc->vc_cols = cols;
2849 vc->vc_rows = rows;
2850 vc->vc_size_row = cols << 1;
2851 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2852
2853 set_origin(vc);
2854 vc->vc_pos = vc->vc_origin;
2855 reset_vc(vc);
2856 for (j=k=0; j<16; j++) {
2857 vc->vc_palette[k++] = default_red[j] ;
2858 vc->vc_palette[k++] = default_grn[j] ;
2859 vc->vc_palette[k++] = default_blu[j] ;
2860 }
2861 vc->vc_def_color = 0x07; /* white */
2862 vc->vc_ulcolor = default_underline_color;
2863 vc->vc_itcolor = default_italic_color;
2864 vc->vc_halfcolor = 0x08; /* grey */
2865 init_waitqueue_head(&vc->paste_wait);
2866 reset_terminal(vc, do_clear);
2867 }
2868
2869 /*
2870 * This routine initializes console interrupts, and does nothing
2871 * else. If you want the screen to clear, call tty_write with
2872 * the appropriate escape-sequence.
2873 */
2874
2875 static int __init con_init(void)
2876 {
2877 const char *display_desc = NULL;
2878 struct vc_data *vc;
2879 unsigned int currcons = 0, i;
2880
2881 acquire_console_sem();
2882
2883 if (conswitchp)
2884 display_desc = conswitchp->con_startup();
2885 if (!display_desc) {
2886 fg_console = 0;
2887 release_console_sem();
2888 return 0;
2889 }
2890
2891 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2892 struct con_driver *con_driver = &registered_con_driver[i];
2893
2894 if (con_driver->con == NULL) {
2895 con_driver->con = conswitchp;
2896 con_driver->desc = display_desc;
2897 con_driver->flag = CON_DRIVER_FLAG_INIT;
2898 con_driver->first = 0;
2899 con_driver->last = MAX_NR_CONSOLES - 1;
2900 break;
2901 }
2902 }
2903
2904 for (i = 0; i < MAX_NR_CONSOLES; i++)
2905 con_driver_map[i] = conswitchp;
2906
2907 if (blankinterval) {
2908 blank_state = blank_normal_wait;
2909 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2910 }
2911
2912 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2913 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2914 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2915 visual_init(vc, currcons, 1);
2916 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2917 vc_init(vc, vc->vc_rows, vc->vc_cols,
2918 currcons || !vc->vc_sw->con_save_screen);
2919 }
2920 currcons = fg_console = 0;
2921 master_display_fg = vc = vc_cons[currcons].d;
2922 set_origin(vc);
2923 save_screen(vc);
2924 gotoxy(vc, vc->vc_x, vc->vc_y);
2925 csi_J(vc, 0);
2926 update_screen(vc);
2927 printk("Console: %s %s %dx%d",
2928 vc->vc_can_do_color ? "colour" : "mono",
2929 display_desc, vc->vc_cols, vc->vc_rows);
2930 printable = 1;
2931 printk("\n");
2932
2933 release_console_sem();
2934
2935 #ifdef CONFIG_VT_CONSOLE
2936 register_console(&vt_console_driver);
2937 #endif
2938 return 0;
2939 }
2940 console_initcall(con_init);
2941
2942 static const struct tty_operations con_ops = {
2943 .open = con_open,
2944 .close = con_close,
2945 .write = con_write,
2946 .write_room = con_write_room,
2947 .put_char = con_put_char,
2948 .flush_chars = con_flush_chars,
2949 .chars_in_buffer = con_chars_in_buffer,
2950 .ioctl = vt_ioctl,
2951 #ifdef CONFIG_COMPAT
2952 .compat_ioctl = vt_compat_ioctl,
2953 #endif
2954 .stop = con_stop,
2955 .start = con_start,
2956 .throttle = con_throttle,
2957 .unthrottle = con_unthrottle,
2958 .resize = vt_resize,
2959 .shutdown = con_shutdown
2960 };
2961
2962 static struct cdev vc0_cdev;
2963
2964 int __init vty_init(const struct file_operations *console_fops)
2965 {
2966 cdev_init(&vc0_cdev, console_fops);
2967 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2968 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2969 panic("Couldn't register /dev/tty0 driver\n");
2970 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2971
2972 vcs_init();
2973
2974 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2975 if (!console_driver)
2976 panic("Couldn't allocate console driver\n");
2977 console_driver->owner = THIS_MODULE;
2978 console_driver->name = "tty";
2979 console_driver->name_base = 1;
2980 console_driver->major = TTY_MAJOR;
2981 console_driver->minor_start = 1;
2982 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2983 console_driver->init_termios = tty_std_termios;
2984 if (default_utf8)
2985 console_driver->init_termios.c_iflag |= IUTF8;
2986 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2987 tty_set_operations(console_driver, &con_ops);
2988 if (tty_register_driver(console_driver))
2989 panic("Couldn't register console driver\n");
2990 kbd_init();
2991 console_map_init();
2992 #ifdef CONFIG_MDA_CONSOLE
2993 mda_console_init();
2994 #endif
2995 return 0;
2996 }
2997
2998 #ifndef VT_SINGLE_DRIVER
2999
3000 static struct class *vtconsole_class;
3001
3002 static int bind_con_driver(const struct consw *csw, int first, int last,
3003 int deflt)
3004 {
3005 struct module *owner = csw->owner;
3006 const char *desc = NULL;
3007 struct con_driver *con_driver;
3008 int i, j = -1, k = -1, retval = -ENODEV;
3009
3010 if (!try_module_get(owner))
3011 return -ENODEV;
3012
3013 acquire_console_sem();
3014
3015 /* check if driver is registered */
3016 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3017 con_driver = &registered_con_driver[i];
3018
3019 if (con_driver->con == csw) {
3020 desc = con_driver->desc;
3021 retval = 0;
3022 break;
3023 }
3024 }
3025
3026 if (retval)
3027 goto err;
3028
3029 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3030 csw->con_startup();
3031 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3032 }
3033
3034 if (deflt) {
3035 if (conswitchp)
3036 module_put(conswitchp->owner);
3037
3038 __module_get(owner);
3039 conswitchp = csw;
3040 }
3041
3042 first = max(first, con_driver->first);
3043 last = min(last, con_driver->last);
3044
3045 for (i = first; i <= last; i++) {
3046 int old_was_color;
3047 struct vc_data *vc = vc_cons[i].d;
3048
3049 if (con_driver_map[i])
3050 module_put(con_driver_map[i]->owner);
3051 __module_get(owner);
3052 con_driver_map[i] = csw;
3053
3054 if (!vc || !vc->vc_sw)
3055 continue;
3056
3057 j = i;
3058
3059 if (CON_IS_VISIBLE(vc)) {
3060 k = i;
3061 save_screen(vc);
3062 }
3063
3064 old_was_color = vc->vc_can_do_color;
3065 vc->vc_sw->con_deinit(vc);
3066 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3067 visual_init(vc, i, 0);
3068 set_origin(vc);
3069 update_attr(vc);
3070
3071 /* If the console changed between mono <-> color, then
3072 * the attributes in the screenbuf will be wrong. The
3073 * following resets all attributes to something sane.
3074 */
3075 if (old_was_color != vc->vc_can_do_color)
3076 clear_buffer_attributes(vc);
3077 }
3078
3079 printk("Console: switching ");
3080 if (!deflt)
3081 printk("consoles %d-%d ", first+1, last+1);
3082 if (j >= 0) {
3083 struct vc_data *vc = vc_cons[j].d;
3084
3085 printk("to %s %s %dx%d\n",
3086 vc->vc_can_do_color ? "colour" : "mono",
3087 desc, vc->vc_cols, vc->vc_rows);
3088
3089 if (k >= 0) {
3090 vc = vc_cons[k].d;
3091 update_screen(vc);
3092 }
3093 } else
3094 printk("to %s\n", desc);
3095
3096 retval = 0;
3097 err:
3098 release_console_sem();
3099 module_put(owner);
3100 return retval;
3101 };
3102
3103 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3104 static int con_is_graphics(const struct consw *csw, int first, int last)
3105 {
3106 int i, retval = 0;
3107
3108 for (i = first; i <= last; i++) {
3109 struct vc_data *vc = vc_cons[i].d;
3110
3111 if (vc && vc->vc_mode == KD_GRAPHICS) {
3112 retval = 1;
3113 break;
3114 }
3115 }
3116
3117 return retval;
3118 }
3119
3120 /**
3121 * unbind_con_driver - unbind a console driver
3122 * @csw: pointer to console driver to unregister
3123 * @first: first in range of consoles that @csw should be unbound from
3124 * @last: last in range of consoles that @csw should be unbound from
3125 * @deflt: should next bound console driver be default after @csw is unbound?
3126 *
3127 * To unbind a driver from all possible consoles, pass 0 as @first and
3128 * %MAX_NR_CONSOLES as @last.
3129 *
3130 * @deflt controls whether the console that ends up replacing @csw should be
3131 * the default console.
3132 *
3133 * RETURNS:
3134 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3135 * or 0 on success.
3136 */
3137 int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3138 {
3139 struct module *owner = csw->owner;
3140 const struct consw *defcsw = NULL;
3141 struct con_driver *con_driver = NULL, *con_back = NULL;
3142 int i, retval = -ENODEV;
3143
3144 if (!try_module_get(owner))
3145 return -ENODEV;
3146
3147 acquire_console_sem();
3148
3149 /* check if driver is registered and if it is unbindable */
3150 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3151 con_driver = &registered_con_driver[i];
3152
3153 if (con_driver->con == csw &&
3154 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3155 retval = 0;
3156 break;
3157 }
3158 }
3159
3160 if (retval) {
3161 release_console_sem();
3162 goto err;
3163 }
3164
3165 retval = -ENODEV;
3166
3167 /* check if backup driver exists */
3168 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3169 con_back = &registered_con_driver[i];
3170
3171 if (con_back->con &&
3172 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3173 defcsw = con_back->con;
3174 retval = 0;
3175 break;
3176 }
3177 }
3178
3179 if (retval) {
3180 release_console_sem();
3181 goto err;
3182 }
3183
3184 if (!con_is_bound(csw)) {
3185 release_console_sem();
3186 goto err;
3187 }
3188
3189 first = max(first, con_driver->first);
3190 last = min(last, con_driver->last);
3191
3192 for (i = first; i <= last; i++) {
3193 if (con_driver_map[i] == csw) {
3194 module_put(csw->owner);
3195 con_driver_map[i] = NULL;
3196 }
3197 }
3198
3199 if (!con_is_bound(defcsw)) {
3200 const struct consw *defconsw = conswitchp;
3201
3202 defcsw->con_startup();
3203 con_back->flag |= CON_DRIVER_FLAG_INIT;
3204 /*
3205 * vgacon may change the default driver to point
3206 * to dummycon, we restore it here...
3207 */
3208 conswitchp = defconsw;
3209 }
3210
3211 if (!con_is_bound(csw))
3212 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3213
3214 release_console_sem();
3215 /* ignore return value, binding should not fail */
3216 bind_con_driver(defcsw, first, last, deflt);
3217 err:
3218 module_put(owner);
3219 return retval;
3220
3221 }
3222 EXPORT_SYMBOL(unbind_con_driver);
3223
3224 static int vt_bind(struct con_driver *con)
3225 {
3226 const struct consw *defcsw = NULL, *csw = NULL;
3227 int i, more = 1, first = -1, last = -1, deflt = 0;
3228
3229 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3230 con_is_graphics(con->con, con->first, con->last))
3231 goto err;
3232
3233 csw = con->con;
3234
3235 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3236 struct con_driver *con = &registered_con_driver[i];
3237
3238 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3239 defcsw = con->con;
3240 break;
3241 }
3242 }
3243
3244 if (!defcsw)
3245 goto err;
3246
3247 while (more) {
3248 more = 0;
3249
3250 for (i = con->first; i <= con->last; i++) {
3251 if (con_driver_map[i] == defcsw) {
3252 if (first == -1)
3253 first = i;
3254 last = i;
3255 more = 1;
3256 } else if (first != -1)
3257 break;
3258 }
3259
3260 if (first == 0 && last == MAX_NR_CONSOLES -1)
3261 deflt = 1;
3262
3263 if (first != -1)
3264 bind_con_driver(csw, first, last, deflt);
3265
3266 first = -1;
3267 last = -1;
3268 deflt = 0;
3269 }
3270
3271 err:
3272 return 0;
3273 }
3274
3275 static int vt_unbind(struct con_driver *con)
3276 {
3277 const struct consw *csw = NULL;
3278 int i, more = 1, first = -1, last = -1, deflt = 0;
3279
3280 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3281 con_is_graphics(con->con, con->first, con->last))
3282 goto err;
3283
3284 csw = con->con;
3285
3286 while (more) {
3287 more = 0;
3288
3289 for (i = con->first; i <= con->last; i++) {
3290 if (con_driver_map[i] == csw) {
3291 if (first == -1)
3292 first = i;
3293 last = i;
3294 more = 1;
3295 } else if (first != -1)
3296 break;
3297 }
3298
3299 if (first == 0 && last == MAX_NR_CONSOLES -1)
3300 deflt = 1;
3301
3302 if (first != -1)
3303 unbind_con_driver(csw, first, last, deflt);
3304
3305 first = -1;
3306 last = -1;
3307 deflt = 0;
3308 }
3309
3310 err:
3311 return 0;
3312 }
3313 #else
3314 static inline int vt_bind(struct con_driver *con)
3315 {
3316 return 0;
3317 }
3318 static inline int vt_unbind(struct con_driver *con)
3319 {
3320 return 0;
3321 }
3322 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3323
3324 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3325 const char *buf, size_t count)
3326 {
3327 struct con_driver *con = dev_get_drvdata(dev);
3328 int bind = simple_strtoul(buf, NULL, 0);
3329
3330 if (bind)
3331 vt_bind(con);
3332 else
3333 vt_unbind(con);
3334
3335 return count;
3336 }
3337
3338 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3339 char *buf)
3340 {
3341 struct con_driver *con = dev_get_drvdata(dev);
3342 int bind = con_is_bound(con->con);
3343
3344 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3345 }
3346
3347 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3348 char *buf)
3349 {
3350 struct con_driver *con = dev_get_drvdata(dev);
3351
3352 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3353 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3354 con->desc);
3355
3356 }
3357
3358 static struct device_attribute device_attrs[] = {
3359 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3360 __ATTR(name, S_IRUGO, show_name, NULL),
3361 };
3362
3363 static int vtconsole_init_device(struct con_driver *con)
3364 {
3365 int i;
3366 int error = 0;
3367
3368 con->flag |= CON_DRIVER_FLAG_ATTR;
3369 dev_set_drvdata(con->dev, con);
3370 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3371 error = device_create_file(con->dev, &device_attrs[i]);
3372 if (error)
3373 break;
3374 }
3375
3376 if (error) {
3377 while (--i >= 0)
3378 device_remove_file(con->dev, &device_attrs[i]);
3379 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3380 }
3381
3382 return error;
3383 }
3384
3385 static void vtconsole_deinit_device(struct con_driver *con)
3386 {
3387 int i;
3388
3389 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3390 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3391 device_remove_file(con->dev, &device_attrs[i]);
3392 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3393 }
3394 }
3395
3396 /**
3397 * con_is_bound - checks if driver is bound to the console
3398 * @csw: console driver
3399 *
3400 * RETURNS: zero if unbound, nonzero if bound
3401 *
3402 * Drivers can call this and if zero, they should release
3403 * all resources allocated on con_startup()
3404 */
3405 int con_is_bound(const struct consw *csw)
3406 {
3407 int i, bound = 0;
3408
3409 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3410 if (con_driver_map[i] == csw) {
3411 bound = 1;
3412 break;
3413 }
3414 }
3415
3416 return bound;
3417 }
3418 EXPORT_SYMBOL(con_is_bound);
3419
3420 /**
3421 * register_con_driver - register console driver to console layer
3422 * @csw: console driver
3423 * @first: the first console to take over, minimum value is 0
3424 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3425 *
3426 * DESCRIPTION: This function registers a console driver which can later
3427 * bind to a range of consoles specified by @first and @last. It will
3428 * also initialize the console driver by calling con_startup().
3429 */
3430 int register_con_driver(const struct consw *csw, int first, int last)
3431 {
3432 struct module *owner = csw->owner;
3433 struct con_driver *con_driver;
3434 const char *desc;
3435 int i, retval = 0;
3436
3437 if (!try_module_get(owner))
3438 return -ENODEV;
3439
3440 acquire_console_sem();
3441
3442 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3443 con_driver = &registered_con_driver[i];
3444
3445 /* already registered */
3446 if (con_driver->con == csw)
3447 retval = -EINVAL;
3448 }
3449
3450 if (retval)
3451 goto err;
3452
3453 desc = csw->con_startup();
3454
3455 if (!desc)
3456 goto err;
3457
3458 retval = -EINVAL;
3459
3460 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3461 con_driver = &registered_con_driver[i];
3462
3463 if (con_driver->con == NULL) {
3464 con_driver->con = csw;
3465 con_driver->desc = desc;
3466 con_driver->node = i;
3467 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3468 CON_DRIVER_FLAG_INIT;
3469 con_driver->first = first;
3470 con_driver->last = last;
3471 retval = 0;
3472 break;
3473 }
3474 }
3475
3476 if (retval)
3477 goto err;
3478
3479 con_driver->dev = device_create(vtconsole_class, NULL,
3480 MKDEV(0, con_driver->node),
3481 NULL, "vtcon%i",
3482 con_driver->node);
3483
3484 if (IS_ERR(con_driver->dev)) {
3485 printk(KERN_WARNING "Unable to create device for %s; "
3486 "errno = %ld\n", con_driver->desc,
3487 PTR_ERR(con_driver->dev));
3488 con_driver->dev = NULL;
3489 } else {
3490 vtconsole_init_device(con_driver);
3491 }
3492
3493 err:
3494 release_console_sem();
3495 module_put(owner);
3496 return retval;
3497 }
3498 EXPORT_SYMBOL(register_con_driver);
3499
3500 /**
3501 * unregister_con_driver - unregister console driver from console layer
3502 * @csw: console driver
3503 *
3504 * DESCRIPTION: All drivers that registers to the console layer must
3505 * call this function upon exit, or if the console driver is in a state
3506 * where it won't be able to handle console services, such as the
3507 * framebuffer console without loaded framebuffer drivers.
3508 *
3509 * The driver must unbind first prior to unregistration.
3510 */
3511 int unregister_con_driver(const struct consw *csw)
3512 {
3513 int i, retval = -ENODEV;
3514
3515 acquire_console_sem();
3516
3517 /* cannot unregister a bound driver */
3518 if (con_is_bound(csw))
3519 goto err;
3520
3521 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3522 struct con_driver *con_driver = &registered_con_driver[i];
3523
3524 if (con_driver->con == csw &&
3525 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3526 vtconsole_deinit_device(con_driver);
3527 device_destroy(vtconsole_class,
3528 MKDEV(0, con_driver->node));
3529 con_driver->con = NULL;
3530 con_driver->desc = NULL;
3531 con_driver->dev = NULL;
3532 con_driver->node = 0;
3533 con_driver->flag = 0;
3534 con_driver->first = 0;
3535 con_driver->last = 0;
3536 retval = 0;
3537 break;
3538 }
3539 }
3540 err:
3541 release_console_sem();
3542 return retval;
3543 }
3544 EXPORT_SYMBOL(unregister_con_driver);
3545
3546 /*
3547 * If we support more console drivers, this function is used
3548 * when a driver wants to take over some existing consoles
3549 * and become default driver for newly opened ones.
3550 *
3551 * take_over_console is basically a register followed by unbind
3552 */
3553 int take_over_console(const struct consw *csw, int first, int last, int deflt)
3554 {
3555 int err;
3556
3557 err = register_con_driver(csw, first, last);
3558
3559 if (!err)
3560 bind_con_driver(csw, first, last, deflt);
3561
3562 return err;
3563 }
3564
3565 /*
3566 * give_up_console is a wrapper to unregister_con_driver. It will only
3567 * work if driver is fully unbound.
3568 */
3569 void give_up_console(const struct consw *csw)
3570 {
3571 unregister_con_driver(csw);
3572 }
3573
3574 static int __init vtconsole_class_init(void)
3575 {
3576 int i;
3577
3578 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3579 if (IS_ERR(vtconsole_class)) {
3580 printk(KERN_WARNING "Unable to create vt console class; "
3581 "errno = %ld\n", PTR_ERR(vtconsole_class));
3582 vtconsole_class = NULL;
3583 }
3584
3585 /* Add system drivers to sysfs */
3586 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3587 struct con_driver *con = &registered_con_driver[i];
3588
3589 if (con->con && !con->dev) {
3590 con->dev = device_create(vtconsole_class, NULL,
3591 MKDEV(0, con->node),
3592 NULL, "vtcon%i",
3593 con->node);
3594
3595 if (IS_ERR(con->dev)) {
3596 printk(KERN_WARNING "Unable to create "
3597 "device for %s; errno = %ld\n",
3598 con->desc, PTR_ERR(con->dev));
3599 con->dev = NULL;
3600 } else {
3601 vtconsole_init_device(con);
3602 }
3603 }
3604 }
3605
3606 return 0;
3607 }
3608 postcore_initcall(vtconsole_class_init);
3609
3610 #endif
3611
3612 /*
3613 * Screen blanking
3614 */
3615
3616 static int set_vesa_blanking(char __user *p)
3617 {
3618 unsigned int mode;
3619
3620 if (get_user(mode, p + 1))
3621 return -EFAULT;
3622
3623 vesa_blank_mode = (mode < 4) ? mode : 0;
3624 return 0;
3625 }
3626
3627 void do_blank_screen(int entering_gfx)
3628 {
3629 struct vc_data *vc = vc_cons[fg_console].d;
3630 int i;
3631
3632 WARN_CONSOLE_UNLOCKED();
3633
3634 if (console_blanked) {
3635 if (blank_state == blank_vesa_wait) {
3636 blank_state = blank_off;
3637 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3638 }
3639 return;
3640 }
3641
3642 /* entering graphics mode? */
3643 if (entering_gfx) {
3644 hide_cursor(vc);
3645 save_screen(vc);
3646 vc->vc_sw->con_blank(vc, -1, 1);
3647 console_blanked = fg_console + 1;
3648 blank_state = blank_off;
3649 set_origin(vc);
3650 return;
3651 }
3652
3653 if (blank_state != blank_normal_wait)
3654 return;
3655 blank_state = blank_off;
3656
3657 /* don't blank graphics */
3658 if (vc->vc_mode != KD_TEXT) {
3659 console_blanked = fg_console + 1;
3660 return;
3661 }
3662
3663 hide_cursor(vc);
3664 del_timer_sync(&console_timer);
3665 blank_timer_expired = 0;
3666
3667 save_screen(vc);
3668 /* In case we need to reset origin, blanking hook returns 1 */
3669 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3670 console_blanked = fg_console + 1;
3671 if (i)
3672 set_origin(vc);
3673
3674 if (console_blank_hook && console_blank_hook(1))
3675 return;
3676
3677 if (vesa_off_interval && vesa_blank_mode) {
3678 blank_state = blank_vesa_wait;
3679 mod_timer(&console_timer, jiffies + vesa_off_interval);
3680 }
3681 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3682 }
3683 EXPORT_SYMBOL(do_blank_screen);
3684
3685 /*
3686 * Called by timer as well as from vt_console_driver
3687 */
3688 void do_unblank_screen(int leaving_gfx)
3689 {
3690 struct vc_data *vc;
3691
3692 /* This should now always be called from a "sane" (read: can schedule)
3693 * context for the sake of the low level drivers, except in the special
3694 * case of oops_in_progress
3695 */
3696 if (!oops_in_progress)
3697 might_sleep();
3698
3699 WARN_CONSOLE_UNLOCKED();
3700
3701 ignore_poke = 0;
3702 if (!console_blanked)
3703 return;
3704 if (!vc_cons_allocated(fg_console)) {
3705 /* impossible */
3706 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3707 return;
3708 }
3709 vc = vc_cons[fg_console].d;
3710 if (vc->vc_mode != KD_TEXT)
3711 return; /* but leave console_blanked != 0 */
3712
3713 if (blankinterval) {
3714 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3715 blank_state = blank_normal_wait;
3716 }
3717
3718 console_blanked = 0;
3719 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3720 /* Low-level driver cannot restore -> do it ourselves */
3721 update_screen(vc);
3722 if (console_blank_hook)
3723 console_blank_hook(0);
3724 set_palette(vc);
3725 set_cursor(vc);
3726 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3727 }
3728 EXPORT_SYMBOL(do_unblank_screen);
3729
3730 /*
3731 * This is called by the outside world to cause a forced unblank, mostly for
3732 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3733 * call it with 1 as an argument and so force a mode restore... that may kill
3734 * X or at least garbage the screen but would also make the Oops visible...
3735 */
3736 void unblank_screen(void)
3737 {
3738 do_unblank_screen(0);
3739 }
3740
3741 /*
3742 * We defer the timer blanking to work queue so it can take the console mutex
3743 * (console operations can still happen at irq time, but only from printk which
3744 * has the console mutex. Not perfect yet, but better than no locking
3745 */
3746 static void blank_screen_t(unsigned long dummy)
3747 {
3748 if (unlikely(!keventd_up())) {
3749 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3750 return;
3751 }
3752 blank_timer_expired = 1;
3753 schedule_work(&console_work);
3754 }
3755
3756 void poke_blanked_console(void)
3757 {
3758 WARN_CONSOLE_UNLOCKED();
3759
3760 /* Add this so we quickly catch whoever might call us in a non
3761 * safe context. Nowadays, unblank_screen() isn't to be called in
3762 * atomic contexts and is allowed to schedule (with the special case
3763 * of oops_in_progress, but that isn't of any concern for this
3764 * function. --BenH.
3765 */
3766 might_sleep();
3767
3768 /* This isn't perfectly race free, but a race here would be mostly harmless,
3769 * at worse, we'll do a spurrious blank and it's unlikely
3770 */
3771 del_timer(&console_timer);
3772 blank_timer_expired = 0;
3773
3774 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3775 return;
3776 if (console_blanked)
3777 unblank_screen();
3778 else if (blankinterval) {
3779 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3780 blank_state = blank_normal_wait;
3781 }
3782 }
3783
3784 /*
3785 * Palettes
3786 */
3787
3788 static void set_palette(struct vc_data *vc)
3789 {
3790 WARN_CONSOLE_UNLOCKED();
3791
3792 if (vc->vc_mode != KD_GRAPHICS)
3793 vc->vc_sw->con_set_palette(vc, color_table);
3794 }
3795
3796 static int set_get_cmap(unsigned char __user *arg, int set)
3797 {
3798 int i, j, k;
3799
3800 WARN_CONSOLE_UNLOCKED();
3801
3802 for (i = 0; i < 16; i++)
3803 if (set) {
3804 get_user(default_red[i], arg++);
3805 get_user(default_grn[i], arg++);
3806 get_user(default_blu[i], arg++);
3807 } else {
3808 put_user(default_red[i], arg++);
3809 put_user(default_grn[i], arg++);
3810 put_user(default_blu[i], arg++);
3811 }
3812 if (set) {
3813 for (i = 0; i < MAX_NR_CONSOLES; i++)
3814 if (vc_cons_allocated(i)) {
3815 for (j = k = 0; j < 16; j++) {
3816 vc_cons[i].d->vc_palette[k++] = default_red[j];
3817 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3818 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3819 }
3820 set_palette(vc_cons[i].d);
3821 }
3822 }
3823 return 0;
3824 }
3825
3826 /*
3827 * Load palette into the DAC registers. arg points to a colour
3828 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3829 */
3830
3831 int con_set_cmap(unsigned char __user *arg)
3832 {
3833 int rc;
3834
3835 acquire_console_sem();
3836 rc = set_get_cmap (arg,1);
3837 release_console_sem();
3838
3839 return rc;
3840 }
3841
3842 int con_get_cmap(unsigned char __user *arg)
3843 {
3844 int rc;
3845
3846 acquire_console_sem();
3847 rc = set_get_cmap (arg,0);
3848 release_console_sem();
3849
3850 return rc;
3851 }
3852
3853 void reset_palette(struct vc_data *vc)
3854 {
3855 int j, k;
3856 for (j=k=0; j<16; j++) {
3857 vc->vc_palette[k++] = default_red[j];
3858 vc->vc_palette[k++] = default_grn[j];
3859 vc->vc_palette[k++] = default_blu[j];
3860 }
3861 set_palette(vc);
3862 }
3863
3864 /*
3865 * Font switching
3866 *
3867 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3868 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3869 * depending on width) reserved for each character which is kinda wasty, but
3870 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3871 * is upto the actual low-level console-driver convert data into its favorite
3872 * format (maybe we should add a `fontoffset' field to the `display'
3873 * structure so we won't have to convert the fontdata all the time.
3874 * /Jes
3875 */
3876
3877 #define max_font_size 65536
3878
3879 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3880 {
3881 struct console_font font;
3882 int rc = -EINVAL;
3883 int c;
3884
3885 if (vc->vc_mode != KD_TEXT)
3886 return -EINVAL;
3887
3888 if (op->data) {
3889 font.data = kmalloc(max_font_size, GFP_KERNEL);
3890 if (!font.data)
3891 return -ENOMEM;
3892 } else
3893 font.data = NULL;
3894
3895 acquire_console_sem();
3896 if (vc->vc_sw->con_font_get)
3897 rc = vc->vc_sw->con_font_get(vc, &font);
3898 else
3899 rc = -ENOSYS;
3900 release_console_sem();
3901
3902 if (rc)
3903 goto out;
3904
3905 c = (font.width+7)/8 * 32 * font.charcount;
3906
3907 if (op->data && font.charcount > op->charcount)
3908 rc = -ENOSPC;
3909 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3910 if (font.width > op->width || font.height > op->height)
3911 rc = -ENOSPC;
3912 } else {
3913 if (font.width != 8)
3914 rc = -EIO;
3915 else if ((op->height && font.height > op->height) ||
3916 font.height > 32)
3917 rc = -ENOSPC;
3918 }
3919 if (rc)
3920 goto out;
3921
3922 op->height = font.height;
3923 op->width = font.width;
3924 op->charcount = font.charcount;
3925
3926 if (op->data && copy_to_user(op->data, font.data, c))
3927 rc = -EFAULT;
3928
3929 out:
3930 kfree(font.data);
3931 return rc;
3932 }
3933
3934 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3935 {
3936 struct console_font font;
3937 int rc = -EINVAL;
3938 int size;
3939
3940 if (vc->vc_mode != KD_TEXT)
3941 return -EINVAL;
3942 if (!op->data)
3943 return -EINVAL;
3944 if (op->charcount > 512)
3945 return -EINVAL;
3946 if (!op->height) { /* Need to guess font height [compat] */
3947 int h, i;
3948 u8 __user *charmap = op->data;
3949 u8 tmp;
3950
3951 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3952 so that we can get rid of this soon */
3953 if (!(op->flags & KD_FONT_FLAG_OLD))
3954 return -EINVAL;
3955 for (h = 32; h > 0; h--)
3956 for (i = 0; i < op->charcount; i++) {
3957 if (get_user(tmp, &charmap[32*i+h-1]))
3958 return -EFAULT;
3959 if (tmp)
3960 goto nonzero;
3961 }
3962 return -EINVAL;
3963 nonzero:
3964 op->height = h;
3965 }
3966 if (op->width <= 0 || op->width > 32 || op->height > 32)
3967 return -EINVAL;
3968 size = (op->width+7)/8 * 32 * op->charcount;
3969 if (size > max_font_size)
3970 return -ENOSPC;
3971 font.charcount = op->charcount;
3972 font.height = op->height;
3973 font.width = op->width;
3974 font.data = kmalloc(size, GFP_KERNEL);
3975 if (!font.data)
3976 return -ENOMEM;
3977 if (copy_from_user(font.data, op->data, size)) {
3978 kfree(font.data);
3979 return -EFAULT;
3980 }
3981 acquire_console_sem();
3982 if (vc->vc_sw->con_font_set)
3983 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3984 else
3985 rc = -ENOSYS;
3986 release_console_sem();
3987 kfree(font.data);
3988 return rc;
3989 }
3990
3991 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3992 {
3993 struct console_font font = {.width = op->width, .height = op->height};
3994 char name[MAX_FONT_NAME];
3995 char *s = name;
3996 int rc;
3997
3998 if (vc->vc_mode != KD_TEXT)
3999 return -EINVAL;
4000
4001 if (!op->data)
4002 s = NULL;
4003 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4004 return -EFAULT;
4005 else
4006 name[MAX_FONT_NAME - 1] = 0;
4007
4008 acquire_console_sem();
4009 if (vc->vc_sw->con_font_default)
4010 rc = vc->vc_sw->con_font_default(vc, &font, s);
4011 else
4012 rc = -ENOSYS;
4013 release_console_sem();
4014 if (!rc) {
4015 op->width = font.width;
4016 op->height = font.height;
4017 }
4018 return rc;
4019 }
4020
4021 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4022 {
4023 int con = op->height;
4024 int rc;
4025
4026 if (vc->vc_mode != KD_TEXT)
4027 return -EINVAL;
4028
4029 acquire_console_sem();
4030 if (!vc->vc_sw->con_font_copy)
4031 rc = -ENOSYS;
4032 else if (con < 0 || !vc_cons_allocated(con))
4033 rc = -ENOTTY;
4034 else if (con == vc->vc_num) /* nothing to do */
4035 rc = 0;
4036 else
4037 rc = vc->vc_sw->con_font_copy(vc, con);
4038 release_console_sem();
4039 return rc;
4040 }
4041
4042 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4043 {
4044 switch (op->op) {
4045 case KD_FONT_OP_SET:
4046 return con_font_set(vc, op);
4047 case KD_FONT_OP_GET:
4048 return con_font_get(vc, op);
4049 case KD_FONT_OP_SET_DEFAULT:
4050 return con_font_default(vc, op);
4051 case KD_FONT_OP_COPY:
4052 return con_font_copy(vc, op);
4053 }
4054 return -ENOSYS;
4055 }
4056
4057 /*
4058 * Interface exported to selection and vcs.
4059 */
4060
4061 /* used by selection */
4062 u16 screen_glyph(struct vc_data *vc, int offset)
4063 {
4064 u16 w = scr_readw(screenpos(vc, offset, 1));
4065 u16 c = w & 0xff;
4066
4067 if (w & vc->vc_hi_font_mask)
4068 c |= 0x100;
4069 return c;
4070 }
4071 EXPORT_SYMBOL_GPL(screen_glyph);
4072
4073 /* used by vcs - note the word offset */
4074 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4075 {
4076 return screenpos(vc, 2 * w_offset, viewed);
4077 }
4078
4079 void getconsxy(struct vc_data *vc, unsigned char *p)
4080 {
4081 p[0] = vc->vc_x;
4082 p[1] = vc->vc_y;
4083 }
4084
4085 void putconsxy(struct vc_data *vc, unsigned char *p)
4086 {
4087 hide_cursor(vc);
4088 gotoxy(vc, p[0], p[1]);
4089 set_cursor(vc);
4090 }
4091
4092 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4093 {
4094 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4095 return softcursor_original;
4096 return scr_readw(org);
4097 }
4098
4099 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4100 {
4101 scr_writew(val, org);
4102 if ((unsigned long)org == vc->vc_pos) {
4103 softcursor_original = -1;
4104 add_softcursor(vc);
4105 }
4106 }
4107
4108 /*
4109 * Visible symbols for modules
4110 */
4111
4112 EXPORT_SYMBOL(color_table);
4113 EXPORT_SYMBOL(default_red);
4114 EXPORT_SYMBOL(default_grn);
4115 EXPORT_SYMBOL(default_blu);
4116 EXPORT_SYMBOL(update_region);
4117 EXPORT_SYMBOL(redraw_screen);
4118 EXPORT_SYMBOL(vc_resize);
4119 EXPORT_SYMBOL(fg_console);
4120 EXPORT_SYMBOL(console_blank_hook);
4121 EXPORT_SYMBOL(console_blanked);
4122 EXPORT_SYMBOL(vc_cons);
4123 EXPORT_SYMBOL(global_cursor_default);
4124 #ifndef VT_SINGLE_DRIVER
4125 EXPORT_SYMBOL(take_over_console);
4126 EXPORT_SYMBOL(give_up_console);
4127 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree