?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / tty / vt / vt.c
blob61b1137d7e56d877fad8b2339c368cd09a5419e1
1 /*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5 /*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71 */
72
73 #include <linux/module.h>
74 #include <linux/types.h>
75 #include <linux/sched.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
81 #include <linux/kd.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
84 #include <linux/mm.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111
112 struct con_driver {
113 const struct consw *con;
114 const char *desc;
115 struct device *dev;
116 int node;
117 int first;
118 int last;
119 int flag;
120 };
121
122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
123 const struct consw *conswitchp;
124
125 /* A bitmap for codes <32. A bit of 1 indicates that the code
126 * corresponding to that bit number invokes some special action
127 * (such as cursor movement) and should not be displayed as a
128 * glyph unless the disp_ctrl mode is explicitly enabled.
129 */
130 #define CTRL_ACTION 0x0d00ff81
131 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
132
133 /*
134 * Here is the default bell parameters: 750HZ, 1/8th of a second
135 */
136 #define DEFAULT_BELL_PITCH 750
137 #define DEFAULT_BELL_DURATION (HZ/8)
138
139 struct vc vc_cons [MAX_NR_CONSOLES];
140
141 #ifndef VT_SINGLE_DRIVER
142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143 #endif
144
145 static int con_open(struct tty_struct *, struct file *);
146 static void vc_init(struct vc_data *vc, unsigned int rows,
147 unsigned int cols, int do_clear);
148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149 static void save_cur(struct vc_data *vc);
150 static void reset_terminal(struct vc_data *vc, int do_clear);
151 static void con_flush_chars(struct tty_struct *tty);
152 static int set_vesa_blanking(char __user *p);
153 static void set_cursor(struct vc_data *vc);
154 static void hide_cursor(struct vc_data *vc);
155 static void console_callback(struct work_struct *ignored);
156 static void blank_screen_t(unsigned long dummy);
157 static void set_palette(struct vc_data *vc);
158
159 static int printable; /* Is console ready for printing? */
160 int default_utf8 = true;
161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
162 int global_cursor_default = -1;
163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
164
165 static int cur_default = CUR_DEFAULT;
166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
167
168 /*
169 * ignore_poke: don't unblank the screen when things are typed. This is
170 * mainly for the privacy of braille terminal users.
171 */
172 static int ignore_poke;
173
174 int do_poke_blanked_console;
175 int console_blanked;
176
177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
178 static int vesa_off_interval;
179 static int blankinterval = 10*60;
180 core_param(consoleblank, blankinterval, int, 0444);
181
182 static DECLARE_WORK(console_work, console_callback);
183
184 /*
185 * fg_console is the current virtual console,
186 * last_console is the last used one,
187 * want_console is the console we want to switch to,
188 * saved_* variants are for save/restore around kernel debugger enter/leave
189 */
190 int fg_console;
191 int last_console;
192 int want_console = -1;
193 static int saved_fg_console;
194 static int saved_last_console;
195 static int saved_want_console;
196 static int saved_vc_mode;
197 static int saved_console_blanked;
198
199 /*
200 * For each existing display, we have a pointer to console currently visible
201 * on that display, allowing consoles other than fg_console to be refreshed
202 * appropriately. Unless the low-level driver supplies its own display_fg
203 * variable, we use this one for the "master display".
204 */
205 static struct vc_data *master_display_fg;
206
207 /*
208 * Unfortunately, we need to delay tty echo when we're currently writing to the
209 * console since the code is (and always was) not re-entrant, so we schedule
210 * all flip requests to process context with schedule-task() and run it from
211 * console_callback().
212 */
213
214 /*
215 * For the same reason, we defer scrollback to the console callback.
216 */
217 static int scrollback_delta;
218
219 /*
220 * Hook so that the power management routines can (un)blank
221 * the console on our behalf.
222 */
223 int (*console_blank_hook)(int);
224
225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
226 static int blank_state;
227 static int blank_timer_expired;
228 enum {
229 blank_off = 0,
230 blank_normal_wait,
231 blank_vesa_wait,
232 };
233
234 /*
235 * /sys/class/tty/tty0/
236 *
237 * the attribute 'active' contains the name of the current vc
238 * console and it supports poll() to detect vc switches
239 */
240 static struct device *tty0dev;
241
242 /*
243 * Notifier list for console events.
244 */
245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
246
247 int register_vt_notifier(struct notifier_block *nb)
248 {
249 return atomic_notifier_chain_register(&vt_notifier_list, nb);
250 }
251 EXPORT_SYMBOL_GPL(register_vt_notifier);
252
253 int unregister_vt_notifier(struct notifier_block *nb)
254 {
255 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
256 }
257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
258
259 static void notify_write(struct vc_data *vc, unsigned int unicode)
260 {
261 struct vt_notifier_param param = { .vc = vc, .c = unicode };
262 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
263 }
264
265 static void notify_update(struct vc_data *vc)
266 {
267 struct vt_notifier_param param = { .vc = vc };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
269 }
270 /*
271 * Low-Level Functions
272 */
273
274 #define IS_FG(vc) ((vc)->vc_num == fg_console)
275
276 #ifdef VT_BUF_VRAM_ONLY
277 #define DO_UPDATE(vc) 0
278 #else
279 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
280 #endif
281
282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
283 {
284 unsigned short *p;
285
286 if (!viewed)
287 p = (unsigned short *)(vc->vc_origin + offset);
288 else if (!vc->vc_sw->con_screen_pos)
289 p = (unsigned short *)(vc->vc_visible_origin + offset);
290 else
291 p = vc->vc_sw->con_screen_pos(vc, offset);
292 return p;
293 }
294
295 /* Called from the keyboard irq path.. */
296 static inline void scrolldelta(int lines)
297 {
298 /* FIXME */
299 /* scrolldelta needs some kind of consistency lock, but the BKL was
300 and still is not protecting versus the scheduled back end */
301 scrollback_delta += lines;
302 schedule_console_callback();
303 }
304
305 void schedule_console_callback(void)
306 {
307 schedule_work(&console_work);
308 }
309
310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
311 {
312 unsigned short *d, *s;
313
314 if (t+nr >= b)
315 nr = b - t - 1;
316 if (b > vc->vc_rows || t >= b || nr < 1)
317 return;
318 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
319 return;
320 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
321 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
322 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
323 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
324 vc->vc_size_row * nr);
325 }
326
327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
328 {
329 unsigned short *s;
330 unsigned int step;
331
332 if (t+nr >= b)
333 nr = b - t - 1;
334 if (b > vc->vc_rows || t >= b || nr < 1)
335 return;
336 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
337 return;
338 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
339 step = vc->vc_cols * nr;
340 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
341 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
342 }
343
344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
345 {
346 #ifndef VT_BUF_VRAM_ONLY
347 unsigned int xx, yy, offset;
348 u16 *p;
349
350 p = (u16 *) start;
351 if (!vc->vc_sw->con_getxy) {
352 offset = (start - vc->vc_origin) / 2;
353 xx = offset % vc->vc_cols;
354 yy = offset / vc->vc_cols;
355 } else {
356 int nxx, nyy;
357 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
358 xx = nxx; yy = nyy;
359 }
360 for(;;) {
361 u16 attrib = scr_readw(p) & 0xff00;
362 int startx = xx;
363 u16 *q = p;
364 while (xx < vc->vc_cols && count) {
365 if (attrib != (scr_readw(p) & 0xff00)) {
366 if (p > q)
367 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
368 startx = xx;
369 q = p;
370 attrib = scr_readw(p) & 0xff00;
371 }
372 p++;
373 xx++;
374 count--;
375 }
376 if (p > q)
377 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
378 if (!count)
379 break;
380 xx = 0;
381 yy++;
382 if (vc->vc_sw->con_getxy) {
383 p = (u16 *)start;
384 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
385 }
386 }
387 #endif
388 }
389
390 void update_region(struct vc_data *vc, unsigned long start, int count)
391 {
392 WARN_CONSOLE_UNLOCKED();
393
394 if (DO_UPDATE(vc)) {
395 hide_cursor(vc);
396 do_update_region(vc, start, count);
397 set_cursor(vc);
398 }
399 }
400
401 /* Structure of attributes is hardware-dependent */
402
403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
404 u8 _underline, u8 _reverse, u8 _italic)
405 {
406 if (vc->vc_sw->con_build_attr)
407 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
408 _blink, _underline, _reverse, _italic);
409
410 #ifndef VT_BUF_VRAM_ONLY
411 /*
412 * ++roman: I completely changed the attribute format for monochrome
413 * mode (!can_do_color). The formerly used MDA (monochrome display
414 * adapter) format didn't allow the combination of certain effects.
415 * Now the attribute is just a bit vector:
416 * Bit 0..1: intensity (0..2)
417 * Bit 2 : underline
418 * Bit 3 : reverse
419 * Bit 7 : blink
420 */
421 {
422 u8 a = _color;
423 if (!vc->vc_can_do_color)
424 return _intensity |
425 (_italic ? 2 : 0) |
426 (_underline ? 4 : 0) |
427 (_reverse ? 8 : 0) |
428 (_blink ? 0x80 : 0);
429 if (_italic)
430 a = (a & 0xF0) | vc->vc_itcolor;
431 else if (_underline)
432 a = (a & 0xf0) | vc->vc_ulcolor;
433 else if (_intensity == 0)
434 a = (a & 0xf0) | vc->vc_ulcolor;
435 if (_reverse)
436 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
437 if (_blink)
438 a ^= 0x80;
439 if (_intensity == 2)
440 a ^= 0x08;
441 if (vc->vc_hi_font_mask == 0x100)
442 a <<= 1;
443 return a;
444 }
445 #else
446 return 0;
447 #endif
448 }
449
450 static void update_attr(struct vc_data *vc)
451 {
452 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
453 vc->vc_blink, vc->vc_underline,
454 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
455 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
456 }
457
458 /* Note: inverting the screen twice should revert to the original state */
459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
460 {
461 unsigned short *p;
462
463 WARN_CONSOLE_UNLOCKED();
464
465 count /= 2;
466 p = screenpos(vc, offset, viewed);
467 if (vc->vc_sw->con_invert_region)
468 vc->vc_sw->con_invert_region(vc, p, count);
469 #ifndef VT_BUF_VRAM_ONLY
470 else {
471 u16 *q = p;
472 int cnt = count;
473 u16 a;
474
475 if (!vc->vc_can_do_color) {
476 while (cnt--) {
477 a = scr_readw(q);
478 a ^= 0x0800;
479 scr_writew(a, q);
480 q++;
481 }
482 } else if (vc->vc_hi_font_mask == 0x100) {
483 while (cnt--) {
484 a = scr_readw(q);
485 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
486 scr_writew(a, q);
487 q++;
488 }
489 } else {
490 while (cnt--) {
491 a = scr_readw(q);
492 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
493 scr_writew(a, q);
494 q++;
495 }
496 }
497 }
498 #endif
499 if (DO_UPDATE(vc))
500 do_update_region(vc, (unsigned long) p, count);
501 }
502
503 /* used by selection: complement pointer position */
504 void complement_pos(struct vc_data *vc, int offset)
505 {
506 static int old_offset = -1;
507 static unsigned short old;
508 static unsigned short oldx, oldy;
509
510 WARN_CONSOLE_UNLOCKED();
511
512 if (old_offset != -1 && old_offset >= 0 &&
513 old_offset < vc->vc_screenbuf_size) {
514 scr_writew(old, screenpos(vc, old_offset, 1));
515 if (DO_UPDATE(vc))
516 vc->vc_sw->con_putc(vc, old, oldy, oldx);
517 }
518
519 old_offset = offset;
520
521 if (offset != -1 && offset >= 0 &&
522 offset < vc->vc_screenbuf_size) {
523 unsigned short new;
524 unsigned short *p;
525 p = screenpos(vc, offset, 1);
526 old = scr_readw(p);
527 new = old ^ vc->vc_complement_mask;
528 scr_writew(new, p);
529 if (DO_UPDATE(vc)) {
530 oldx = (offset >> 1) % vc->vc_cols;
531 oldy = (offset >> 1) / vc->vc_cols;
532 vc->vc_sw->con_putc(vc, new, oldy, oldx);
533 }
534 }
535
536 }
537
538 static void insert_char(struct vc_data *vc, unsigned int nr)
539 {
540 unsigned short *p = (unsigned short *) vc->vc_pos;
541
542 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
543 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
544 vc->vc_need_wrap = 0;
545 if (DO_UPDATE(vc))
546 do_update_region(vc, (unsigned long) p,
547 vc->vc_cols - vc->vc_x);
548 }
549
550 static void delete_char(struct vc_data *vc, unsigned int nr)
551 {
552 unsigned short *p = (unsigned short *) vc->vc_pos;
553
554 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
555 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
556 nr * 2);
557 vc->vc_need_wrap = 0;
558 if (DO_UPDATE(vc))
559 do_update_region(vc, (unsigned long) p,
560 vc->vc_cols - vc->vc_x);
561 }
562
563 static int softcursor_original;
564
565 static void add_softcursor(struct vc_data *vc)
566 {
567 int i = scr_readw((u16 *) vc->vc_pos);
568 u32 type = vc->vc_cursor_type;
569
570 if (! (type & 0x10)) return;
571 if (softcursor_original != -1) return;
572 softcursor_original = i;
573 i |= ((type >> 8) & 0xff00 );
574 i ^= ((type) & 0xff00 );
575 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
576 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
577 scr_writew(i, (u16 *) vc->vc_pos);
578 if (DO_UPDATE(vc))
579 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
580 }
581
582 static void hide_softcursor(struct vc_data *vc)
583 {
584 if (softcursor_original != -1) {
585 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, softcursor_original,
588 vc->vc_y, vc->vc_x);
589 softcursor_original = -1;
590 }
591 }
592
593 static void hide_cursor(struct vc_data *vc)
594 {
595 if (vc == sel_cons)
596 clear_selection();
597 vc->vc_sw->con_cursor(vc, CM_ERASE);
598 hide_softcursor(vc);
599 }
600
601 static void set_cursor(struct vc_data *vc)
602 {
603 if (!IS_FG(vc) || console_blanked ||
604 vc->vc_mode == KD_GRAPHICS)
605 return;
606 if (vc->vc_deccm) {
607 if (vc == sel_cons)
608 clear_selection();
609 add_softcursor(vc);
610 if ((vc->vc_cursor_type & 0x0f) != 1)
611 vc->vc_sw->con_cursor(vc, CM_DRAW);
612 } else
613 hide_cursor(vc);
614 }
615
616 static void set_origin(struct vc_data *vc)
617 {
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!CON_IS_VISIBLE(vc) ||
621 !vc->vc_sw->con_set_origin ||
622 !vc->vc_sw->con_set_origin(vc))
623 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
624 vc->vc_visible_origin = vc->vc_origin;
625 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
626 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
627 }
628
629 static inline void save_screen(struct vc_data *vc)
630 {
631 WARN_CONSOLE_UNLOCKED();
632
633 if (vc->vc_sw->con_save_screen)
634 vc->vc_sw->con_save_screen(vc);
635 }
636
637 /*
638 * Redrawing of screen
639 */
640
641 void clear_buffer_attributes(struct vc_data *vc)
642 {
643 unsigned short *p = (unsigned short *)vc->vc_origin;
644 int count = vc->vc_screenbuf_size / 2;
645 int mask = vc->vc_hi_font_mask | 0xff;
646
647 for (; count > 0; count--, p++) {
648 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
649 }
650 }
651
652 void redraw_screen(struct vc_data *vc, int is_switch)
653 {
654 int redraw = 0;
655
656 WARN_CONSOLE_UNLOCKED();
657
658 if (!vc) {
659 /* strange ... */
660 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
661 return;
662 }
663
664 if (is_switch) {
665 struct vc_data *old_vc = vc_cons[fg_console].d;
666 if (old_vc == vc)
667 return;
668 if (!CON_IS_VISIBLE(vc))
669 redraw = 1;
670 *vc->vc_display_fg = vc;
671 fg_console = vc->vc_num;
672 hide_cursor(old_vc);
673 if (!CON_IS_VISIBLE(old_vc)) {
674 save_screen(old_vc);
675 set_origin(old_vc);
676 }
677 if (tty0dev)
678 sysfs_notify(&tty0dev->kobj, NULL, "active");
679 } else {
680 hide_cursor(vc);
681 redraw = 1;
682 }
683
684 if (redraw) {
685 int update;
686 int old_was_color = vc->vc_can_do_color;
687
688 set_origin(vc);
689 update = vc->vc_sw->con_switch(vc);
690 set_palette(vc);
691 /*
692 * If console changed from mono<->color, the best we can do
693 * is to clear the buffer attributes. As it currently stands,
694 * rebuilding new attributes from the old buffer is not doable
695 * without overly complex code.
696 */
697 if (old_was_color != vc->vc_can_do_color) {
698 update_attr(vc);
699 clear_buffer_attributes(vc);
700 }
701
702 /* Forcibly update if we're panicing */
703 if ((update && vc->vc_mode != KD_GRAPHICS) ||
704 vt_force_oops_output(vc))
705 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
706 }
707 set_cursor(vc);
708 if (is_switch) {
709 set_leds();
710 compute_shiftstate();
711 notify_update(vc);
712 }
713 }
714
715 /*
716 * Allocation, freeing and resizing of VTs.
717 */
718
719 int vc_cons_allocated(unsigned int i)
720 {
721 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
722 }
723
724 static void visual_init(struct vc_data *vc, int num, int init)
725 {
726 /* ++Geert: vc->vc_sw->con_init determines console size */
727 if (vc->vc_sw)
728 module_put(vc->vc_sw->owner);
729 vc->vc_sw = conswitchp;
730 #ifndef VT_SINGLE_DRIVER
731 if (con_driver_map[num])
732 vc->vc_sw = con_driver_map[num];
733 #endif
734 __module_get(vc->vc_sw->owner);
735 vc->vc_num = num;
736 vc->vc_display_fg = &master_display_fg;
737 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
738 vc->vc_uni_pagedir = 0;
739 vc->vc_hi_font_mask = 0;
740 vc->vc_complement_mask = 0;
741 vc->vc_can_do_color = 0;
742 vc->vc_panic_force_write = false;
743 vc->vc_sw->con_init(vc, init);
744 if (!vc->vc_complement_mask)
745 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
746 vc->vc_s_complement_mask = vc->vc_complement_mask;
747 vc->vc_size_row = vc->vc_cols << 1;
748 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
749 }
750
751 int vc_allocate(unsigned int currcons) /* return 0 on success */
752 {
753 WARN_CONSOLE_UNLOCKED();
754
755 if (currcons >= MAX_NR_CONSOLES)
756 return -ENXIO;
757 if (!vc_cons[currcons].d) {
758 struct vc_data *vc;
759 struct vt_notifier_param param;
760
761 /* prevent users from taking too much memory */
762 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
763 return -EPERM;
764
765 /* due to the granularity of kmalloc, we waste some memory here */
766 /* the alloc is done in two steps, to optimize the common situation
767 of a 25x80 console (structsize=216, screenbuf_size=4000) */
768 /* although the numbers above are not valid since long ago, the
769 point is still up-to-date and the comment still has its value
770 even if only as a historical artifact. --mj, July 1998 */
771 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
772 if (!vc)
773 return -ENOMEM;
774 vc_cons[currcons].d = vc;
775 tty_port_init(&vc->port);
776 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
777 visual_init(vc, currcons, 1);
778 if (!*vc->vc_uni_pagedir_loc)
779 con_set_default_unimap(vc);
780 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
781 if (!vc->vc_screenbuf) {
782 kfree(vc);
783 vc_cons[currcons].d = NULL;
784 return -ENOMEM;
785 }
786
787 /* If no drivers have overridden us and the user didn't pass a
788 boot option, default to displaying the cursor */
789 if (global_cursor_default == -1)
790 global_cursor_default = 1;
791
792 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
793 vcs_make_sysfs(currcons);
794 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
795 }
796 return 0;
797 }
798
799 static inline int resize_screen(struct vc_data *vc, int width, int height,
800 int user)
801 {
802 /* Resizes the resolution of the display adapater */
803 int err = 0;
804
805 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
806 err = vc->vc_sw->con_resize(vc, width, height, user);
807
808 return err;
809 }
810
811 /*
812 * Change # of rows and columns (0 means unchanged/the size of fg_console)
813 * [this is to be used together with some user program
814 * like resize that changes the hardware videomode]
815 */
816 #define VC_RESIZE_MAXCOL (32767)
817 #define VC_RESIZE_MAXROW (32767)
818
819 /**
820 * vc_do_resize - resizing method for the tty
821 * @tty: tty being resized
822 * @real_tty: real tty (different to tty if a pty/tty pair)
823 * @vc: virtual console private data
824 * @cols: columns
825 * @lines: lines
826 *
827 * Resize a virtual console, clipping according to the actual constraints.
828 * If the caller passes a tty structure then update the termios winsize
829 * information and perform any necessary signal handling.
830 *
831 * Caller must hold the console semaphore. Takes the termios rwsem and
832 * ctrl_lock of the tty IFF a tty is passed.
833 */
834
835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
836 unsigned int cols, unsigned int lines)
837 {
838 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
839 unsigned long end;
840 unsigned int old_rows, old_row_size;
841 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
842 unsigned int user;
843 unsigned short *newscreen;
844
845 WARN_CONSOLE_UNLOCKED();
846
847 if (!vc)
848 return -ENXIO;
849
850 user = vc->vc_resize_user;
851 vc->vc_resize_user = 0;
852
853 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
854 return -EINVAL;
855
856 new_cols = (cols ? cols : vc->vc_cols);
857 new_rows = (lines ? lines : vc->vc_rows);
858 new_row_size = new_cols << 1;
859 new_screen_size = new_row_size * new_rows;
860
861 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
862 return 0;
863
864 newscreen = kmalloc(new_screen_size, GFP_USER);
865 if (!newscreen)
866 return -ENOMEM;
867
868 old_rows = vc->vc_rows;
869 old_row_size = vc->vc_size_row;
870
871 err = resize_screen(vc, new_cols, new_rows, user);
872 if (err) {
873 kfree(newscreen);
874 return err;
875 }
876
877 vc->vc_rows = new_rows;
878 vc->vc_cols = new_cols;
879 vc->vc_size_row = new_row_size;
880 vc->vc_screenbuf_size = new_screen_size;
881
882 rlth = min(old_row_size, new_row_size);
883 rrem = new_row_size - rlth;
884 old_origin = vc->vc_origin;
885 new_origin = (long) newscreen;
886 new_scr_end = new_origin + new_screen_size;
887
888 if (vc->vc_y > new_rows) {
889 if (old_rows - vc->vc_y < new_rows) {
890 /*
891 * Cursor near the bottom, copy contents from the
892 * bottom of buffer
893 */
894 old_origin += (old_rows - new_rows) * old_row_size;
895 } else {
896 /*
897 * Cursor is in no man's land, copy 1/2 screenful
898 * from the top and bottom of cursor position
899 */
900 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
901 }
902 }
903
904 end = old_origin + old_row_size * min(old_rows, new_rows);
905
906 update_attr(vc);
907
908 while (old_origin < end) {
909 scr_memcpyw((unsigned short *) new_origin,
910 (unsigned short *) old_origin, rlth);
911 if (rrem)
912 scr_memsetw((void *)(new_origin + rlth),
913 vc->vc_video_erase_char, rrem);
914 old_origin += old_row_size;
915 new_origin += new_row_size;
916 }
917 if (new_scr_end > new_origin)
918 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
919 new_scr_end - new_origin);
920 kfree(vc->vc_screenbuf);
921 vc->vc_screenbuf = newscreen;
922 vc->vc_screenbuf_size = new_screen_size;
923 set_origin(vc);
924
925 /* do part of a reset_terminal() */
926 vc->vc_top = 0;
927 vc->vc_bottom = vc->vc_rows;
928 gotoxy(vc, vc->vc_x, vc->vc_y);
929 save_cur(vc);
930
931 if (tty) {
932 /* Rewrite the requested winsize data with the actual
933 resulting sizes */
934 struct winsize ws;
935 memset(&ws, 0, sizeof(ws));
936 ws.ws_row = vc->vc_rows;
937 ws.ws_col = vc->vc_cols;
938 ws.ws_ypixel = vc->vc_scan_lines;
939 tty_do_resize(tty, &ws);
940 }
941
942 if (CON_IS_VISIBLE(vc))
943 update_screen(vc);
944 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
945 return err;
946 }
947
948 /**
949 * vc_resize - resize a VT
950 * @vc: virtual console
951 * @cols: columns
952 * @rows: rows
953 *
954 * Resize a virtual console as seen from the console end of things. We
955 * use the common vc_do_resize methods to update the structures. The
956 * caller must hold the console sem to protect console internals and
957 * vc->port.tty
958 */
959
960 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
961 {
962 return vc_do_resize(vc->port.tty, vc, cols, rows);
963 }
964
965 /**
966 * vt_resize - resize a VT
967 * @tty: tty to resize
968 * @ws: winsize attributes
969 *
970 * Resize a virtual terminal. This is called by the tty layer as we
971 * register our own handler for resizing. The mutual helper does all
972 * the actual work.
973 *
974 * Takes the console sem and the called methods then take the tty
975 * termios_rwsem and the tty ctrl_lock in that order.
976 */
977 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
978 {
979 struct vc_data *vc = tty->driver_data;
980 int ret;
981
982 console_lock();
983 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
984 console_unlock();
985 return ret;
986 }
987
988 struct vc_data *vc_deallocate(unsigned int currcons)
989 {
990 struct vc_data *vc = NULL;
991
992 WARN_CONSOLE_UNLOCKED();
993
994 if (vc_cons_allocated(currcons)) {
995 struct vt_notifier_param param;
996
997 param.vc = vc = vc_cons[currcons].d;
998 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
999 vcs_remove_sysfs(currcons);
1000 vc->vc_sw->con_deinit(vc);
1001 put_pid(vc->vt_pid);
1002 module_put(vc->vc_sw->owner);
1003 kfree(vc->vc_screenbuf);
1004 vc_cons[currcons].d = NULL;
1005 }
1006 return vc;
1007 }
1008
1009 /*
1010 * VT102 emulator
1011 */
1012
1013 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1014 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1015 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1016
1017 #define decarm VC_REPEAT
1018 #define decckm VC_CKMODE
1019 #define kbdapplic VC_APPLIC
1020 #define lnm VC_CRLF
1021
1022 /*
1023 * this is what the terminal answers to a ESC-Z or csi0c query.
1024 */
1025 #define VT100ID "\033[?1;2c"
1026 #define VT102ID "\033[?6c"
1027
1028 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1029 8,12,10,14, 9,13,11,15 };
1030
1031 /* the default colour table, for VGA+ colour systems */
1032 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1033 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1034 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1035 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1036 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1037 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1038
1039 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042
1043 /*
1044 * gotoxy() must verify all boundaries, because the arguments
1045 * might also be negative. If the given position is out of
1046 * bounds, the cursor is placed at the nearest margin.
1047 */
1048 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1049 {
1050 int min_y, max_y;
1051
1052 if (new_x < 0)
1053 vc->vc_x = 0;
1054 else {
1055 if (new_x >= vc->vc_cols)
1056 vc->vc_x = vc->vc_cols - 1;
1057 else
1058 vc->vc_x = new_x;
1059 }
1060
1061 if (vc->vc_decom) {
1062 min_y = vc->vc_top;
1063 max_y = vc->vc_bottom;
1064 } else {
1065 min_y = 0;
1066 max_y = vc->vc_rows;
1067 }
1068 if (new_y < min_y)
1069 vc->vc_y = min_y;
1070 else if (new_y >= max_y)
1071 vc->vc_y = max_y - 1;
1072 else
1073 vc->vc_y = new_y;
1074 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1075 vc->vc_need_wrap = 0;
1076 }
1077
1078 /* for absolute user moves, when decom is set */
1079 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1080 {
1081 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082 }
1083
1084 void scrollback(struct vc_data *vc, int lines)
1085 {
1086 if (!lines)
1087 lines = vc->vc_rows / 2;
1088 scrolldelta(-lines);
1089 }
1090
1091 void scrollfront(struct vc_data *vc, int lines)
1092 {
1093 if (!lines)
1094 lines = vc->vc_rows / 2;
1095 scrolldelta(lines);
1096 }
1097
1098 static void lf(struct vc_data *vc)
1099 {
1100 /* don't scroll if above bottom of scrolling region, or
1101 * if below scrolling region
1102 */
1103 if (vc->vc_y + 1 == vc->vc_bottom)
1104 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1105 else if (vc->vc_y < vc->vc_rows - 1) {
1106 vc->vc_y++;
1107 vc->vc_pos += vc->vc_size_row;
1108 }
1109 vc->vc_need_wrap = 0;
1110 notify_write(vc, '\n');
1111 }
1112
1113 static void ri(struct vc_data *vc)
1114 {
1115 /* don't scroll if below top of scrolling region, or
1116 * if above scrolling region
1117 */
1118 if (vc->vc_y == vc->vc_top)
1119 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1120 else if (vc->vc_y > 0) {
1121 vc->vc_y--;
1122 vc->vc_pos -= vc->vc_size_row;
1123 }
1124 vc->vc_need_wrap = 0;
1125 }
1126
1127 static inline void cr(struct vc_data *vc)
1128 {
1129 vc->vc_pos -= vc->vc_x << 1;
1130 vc->vc_need_wrap = vc->vc_x = 0;
1131 notify_write(vc, '\r');
1132 }
1133
1134 static inline void bs(struct vc_data *vc)
1135 {
1136 if (vc->vc_x) {
1137 vc->vc_pos -= 2;
1138 vc->vc_x--;
1139 vc->vc_need_wrap = 0;
1140 notify_write(vc, '\b');
1141 }
1142 }
1143
1144 static inline void del(struct vc_data *vc)
1145 {
1146 /* ignored */
1147 }
1148
1149 static void csi_J(struct vc_data *vc, int vpar)
1150 {
1151 unsigned int count;
1152 unsigned short * start;
1153
1154 switch (vpar) {
1155 case 0: /* erase from cursor to end of display */
1156 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1157 start = (unsigned short *)vc->vc_pos;
1158 break;
1159 case 1: /* erase from start to cursor */
1160 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161 start = (unsigned short *)vc->vc_origin;
1162 break;
1163 case 3: /* erase scroll-back buffer (and whole display) */
1164 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1165 vc->vc_screenbuf_size >> 1);
1166 set_origin(vc);
1167 /* fall through */
1168 case 2: /* erase whole display */
1169 count = vc->vc_cols * vc->vc_rows;
1170 start = (unsigned short *)vc->vc_origin;
1171 break;
1172 default:
1173 return;
1174 }
1175 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1176 if (DO_UPDATE(vc))
1177 do_update_region(vc, (unsigned long) start, count);
1178 vc->vc_need_wrap = 0;
1179 }
1180
1181 static void csi_K(struct vc_data *vc, int vpar)
1182 {
1183 unsigned int count;
1184 unsigned short * start;
1185
1186 switch (vpar) {
1187 case 0: /* erase from cursor to end of line */
1188 count = vc->vc_cols - vc->vc_x;
1189 start = (unsigned short *)vc->vc_pos;
1190 break;
1191 case 1: /* erase from start of line to cursor */
1192 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1193 count = vc->vc_x + 1;
1194 break;
1195 case 2: /* erase whole line */
1196 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1197 count = vc->vc_cols;
1198 break;
1199 default:
1200 return;
1201 }
1202 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1203 vc->vc_need_wrap = 0;
1204 if (DO_UPDATE(vc))
1205 do_update_region(vc, (unsigned long) start, count);
1206 }
1207
1208 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1209 { /* not vt100? */
1210 int count;
1211
1212 if (!vpar)
1213 vpar++;
1214 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1215
1216 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1217 if (DO_UPDATE(vc))
1218 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1219 vc->vc_need_wrap = 0;
1220 }
1221
1222 static void default_attr(struct vc_data *vc)
1223 {
1224 vc->vc_intensity = 1;
1225 vc->vc_italic = 0;
1226 vc->vc_underline = 0;
1227 vc->vc_reverse = 0;
1228 vc->vc_blink = 0;
1229 vc->vc_color = vc->vc_def_color;
1230 }
1231
1232 /* console_lock is held */
1233 static void csi_m(struct vc_data *vc)
1234 {
1235 int i;
1236
1237 for (i = 0; i <= vc->vc_npar; i++)
1238 switch (vc->vc_par[i]) {
1239 case 0: /* all attributes off */
1240 default_attr(vc);
1241 break;
1242 case 1:
1243 vc->vc_intensity = 2;
1244 break;
1245 case 2:
1246 vc->vc_intensity = 0;
1247 break;
1248 case 3:
1249 vc->vc_italic = 1;
1250 break;
1251 case 4:
1252 vc->vc_underline = 1;
1253 break;
1254 case 5:
1255 vc->vc_blink = 1;
1256 break;
1257 case 7:
1258 vc->vc_reverse = 1;
1259 break;
1260 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1261 * Select primary font, don't display
1262 * control chars if defined, don't set
1263 * bit 8 on output.
1264 */
1265 vc->vc_translate = set_translate(vc->vc_charset == 0
1266 ? vc->vc_G0_charset
1267 : vc->vc_G1_charset, vc);
1268 vc->vc_disp_ctrl = 0;
1269 vc->vc_toggle_meta = 0;
1270 break;
1271 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1272 * Select first alternate font, lets
1273 * chars < 32 be displayed as ROM chars.
1274 */
1275 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1276 vc->vc_disp_ctrl = 1;
1277 vc->vc_toggle_meta = 0;
1278 break;
1279 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1280 * Select second alternate font, toggle
1281 * high bit before displaying as ROM char.
1282 */
1283 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1284 vc->vc_disp_ctrl = 1;
1285 vc->vc_toggle_meta = 1;
1286 break;
1287 case 21:
1288 case 22:
1289 vc->vc_intensity = 1;
1290 break;
1291 case 23:
1292 vc->vc_italic = 0;
1293 break;
1294 case 24:
1295 vc->vc_underline = 0;
1296 break;
1297 case 25:
1298 vc->vc_blink = 0;
1299 break;
1300 case 27:
1301 vc->vc_reverse = 0;
1302 break;
1303 case 38:
1304 case 48: /* ITU T.416
1305 * Higher colour modes.
1306 * They break the usual properties of SGR codes
1307 * and thus need to be detected and ignored by
1308 * hand. Strictly speaking, that standard also
1309 * wants : rather than ; as separators, contrary
1310 * to ECMA-48, but no one produces such codes
1311 * and almost no one accepts them.
1312 */
1313 i++;
1314 if (i > vc->vc_npar)
1315 break;
1316 if (vc->vc_par[i] == 5) /* 256 colours */
1317 i++; /* ubiquitous */
1318 else if (vc->vc_par[i] == 2) /* 24 bit colours */
1319 i += 3; /* extremely rare */
1320 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1321 * that detecting them is not worth the few extra
1322 * bytes of kernel's size.
1323 */
1324 break;
1325 case 39:
1326 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1327 break;
1328 case 49:
1329 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1330 break;
1331 default:
1332 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1333 vc->vc_color = color_table[vc->vc_par[i] - 30]
1334 | (vc->vc_color & 0xf0);
1335 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1336 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1337 | (vc->vc_color & 0x0f);
1338 break;
1339 }
1340 update_attr(vc);
1341 }
1342
1343 static void respond_string(const char *p, struct tty_port *port)
1344 {
1345 while (*p) {
1346 tty_insert_flip_char(port, *p, 0);
1347 p++;
1348 }
1349 tty_schedule_flip(port);
1350 }
1351
1352 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1353 {
1354 char buf[40];
1355
1356 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1357 respond_string(buf, tty->port);
1358 }
1359
1360 static inline void status_report(struct tty_struct *tty)
1361 {
1362 respond_string("\033[0n", tty->port); /* Terminal ok */
1363 }
1364
1365 static inline void respond_ID(struct tty_struct *tty)
1366 {
1367 respond_string(VT102ID, tty->port);
1368 }
1369
1370 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1371 {
1372 char buf[8];
1373
1374 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1375 (char)('!' + mry));
1376 respond_string(buf, tty->port);
1377 }
1378
1379 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1380 int mouse_reporting(void)
1381 {
1382 return vc_cons[fg_console].d->vc_report_mouse;
1383 }
1384
1385 /* console_lock is held */
1386 static void set_mode(struct vc_data *vc, int on_off)
1387 {
1388 int i;
1389
1390 for (i = 0; i <= vc->vc_npar; i++)
1391 if (vc->vc_ques) {
1392 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1393 case 1: /* Cursor keys send ^[Ox/^[[x */
1394 if (on_off)
1395 set_kbd(vc, decckm);
1396 else
1397 clr_kbd(vc, decckm);
1398 break;
1399 case 3: /* 80/132 mode switch unimplemented */
1400 vc->vc_deccolm = on_off;
1401 #if 0
1402 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1403 /* this alone does not suffice; some user mode
1404 utility has to change the hardware regs */
1405 #endif
1406 break;
1407 case 5: /* Inverted screen on/off */
1408 if (vc->vc_decscnm != on_off) {
1409 vc->vc_decscnm = on_off;
1410 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1411 update_attr(vc);
1412 }
1413 break;
1414 case 6: /* Origin relative/absolute */
1415 vc->vc_decom = on_off;
1416 gotoxay(vc, 0, 0);
1417 break;
1418 case 7: /* Autowrap on/off */
1419 vc->vc_decawm = on_off;
1420 break;
1421 case 8: /* Autorepeat on/off */
1422 if (on_off)
1423 set_kbd(vc, decarm);
1424 else
1425 clr_kbd(vc, decarm);
1426 break;
1427 case 9:
1428 vc->vc_report_mouse = on_off ? 1 : 0;
1429 break;
1430 case 25: /* Cursor on/off */
1431 vc->vc_deccm = on_off;
1432 break;
1433 case 1000:
1434 vc->vc_report_mouse = on_off ? 2 : 0;
1435 break;
1436 }
1437 } else {
1438 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1439 case 3: /* Monitor (display ctrls) */
1440 vc->vc_disp_ctrl = on_off;
1441 break;
1442 case 4: /* Insert Mode on/off */
1443 vc->vc_decim = on_off;
1444 break;
1445 case 20: /* Lf, Enter == CrLf/Lf */
1446 if (on_off)
1447 set_kbd(vc, lnm);
1448 else
1449 clr_kbd(vc, lnm);
1450 break;
1451 }
1452 }
1453 }
1454
1455 /* console_lock is held */
1456 static void setterm_command(struct vc_data *vc)
1457 {
1458 switch(vc->vc_par[0]) {
1459 case 1: /* set color for underline mode */
1460 if (vc->vc_can_do_color &&
1461 vc->vc_par[1] < 16) {
1462 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1463 if (vc->vc_underline)
1464 update_attr(vc);
1465 }
1466 break;
1467 case 2: /* set color for half intensity mode */
1468 if (vc->vc_can_do_color &&
1469 vc->vc_par[1] < 16) {
1470 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1471 if (vc->vc_intensity == 0)
1472 update_attr(vc);
1473 }
1474 break;
1475 case 8: /* store colors as defaults */
1476 vc->vc_def_color = vc->vc_attr;
1477 if (vc->vc_hi_font_mask == 0x100)
1478 vc->vc_def_color >>= 1;
1479 default_attr(vc);
1480 update_attr(vc);
1481 break;
1482 case 9: /* set blanking interval */
1483 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1484 poke_blanked_console();
1485 break;
1486 case 10: /* set bell frequency in Hz */
1487 if (vc->vc_npar >= 1)
1488 vc->vc_bell_pitch = vc->vc_par[1];
1489 else
1490 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1491 break;
1492 case 11: /* set bell duration in msec */
1493 if (vc->vc_npar >= 1)
1494 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1495 vc->vc_par[1] * HZ / 1000 : 0;
1496 else
1497 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1498 break;
1499 case 12: /* bring specified console to the front */
1500 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1501 set_console(vc->vc_par[1] - 1);
1502 break;
1503 case 13: /* unblank the screen */
1504 poke_blanked_console();
1505 break;
1506 case 14: /* set vesa powerdown interval */
1507 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1508 break;
1509 case 15: /* activate the previous console */
1510 set_console(last_console);
1511 break;
1512 }
1513 }
1514
1515 /* console_lock is held */
1516 static void csi_at(struct vc_data *vc, unsigned int nr)
1517 {
1518 if (nr > vc->vc_cols - vc->vc_x)
1519 nr = vc->vc_cols - vc->vc_x;
1520 else if (!nr)
1521 nr = 1;
1522 insert_char(vc, nr);
1523 }
1524
1525 /* console_lock is held */
1526 static void csi_L(struct vc_data *vc, unsigned int nr)
1527 {
1528 if (nr > vc->vc_rows - vc->vc_y)
1529 nr = vc->vc_rows - vc->vc_y;
1530 else if (!nr)
1531 nr = 1;
1532 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1533 vc->vc_need_wrap = 0;
1534 }
1535
1536 /* console_lock is held */
1537 static void csi_P(struct vc_data *vc, unsigned int nr)
1538 {
1539 if (nr > vc->vc_cols - vc->vc_x)
1540 nr = vc->vc_cols - vc->vc_x;
1541 else if (!nr)
1542 nr = 1;
1543 delete_char(vc, nr);
1544 }
1545
1546 /* console_lock is held */
1547 static void csi_M(struct vc_data *vc, unsigned int nr)
1548 {
1549 if (nr > vc->vc_rows - vc->vc_y)
1550 nr = vc->vc_rows - vc->vc_y;
1551 else if (!nr)
1552 nr=1;
1553 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1554 vc->vc_need_wrap = 0;
1555 }
1556
1557 /* console_lock is held (except via vc_init->reset_terminal */
1558 static void save_cur(struct vc_data *vc)
1559 {
1560 vc->vc_saved_x = vc->vc_x;
1561 vc->vc_saved_y = vc->vc_y;
1562 vc->vc_s_intensity = vc->vc_intensity;
1563 vc->vc_s_italic = vc->vc_italic;
1564 vc->vc_s_underline = vc->vc_underline;
1565 vc->vc_s_blink = vc->vc_blink;
1566 vc->vc_s_reverse = vc->vc_reverse;
1567 vc->vc_s_charset = vc->vc_charset;
1568 vc->vc_s_color = vc->vc_color;
1569 vc->vc_saved_G0 = vc->vc_G0_charset;
1570 vc->vc_saved_G1 = vc->vc_G1_charset;
1571 }
1572
1573 /* console_lock is held */
1574 static void restore_cur(struct vc_data *vc)
1575 {
1576 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1577 vc->vc_intensity = vc->vc_s_intensity;
1578 vc->vc_italic = vc->vc_s_italic;
1579 vc->vc_underline = vc->vc_s_underline;
1580 vc->vc_blink = vc->vc_s_blink;
1581 vc->vc_reverse = vc->vc_s_reverse;
1582 vc->vc_charset = vc->vc_s_charset;
1583 vc->vc_color = vc->vc_s_color;
1584 vc->vc_G0_charset = vc->vc_saved_G0;
1585 vc->vc_G1_charset = vc->vc_saved_G1;
1586 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1587 update_attr(vc);
1588 vc->vc_need_wrap = 0;
1589 }
1590
1591 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1592 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1593 ESpalette };
1594
1595 /* console_lock is held (except via vc_init()) */
1596 static void reset_terminal(struct vc_data *vc, int do_clear)
1597 {
1598 vc->vc_top = 0;
1599 vc->vc_bottom = vc->vc_rows;
1600 vc->vc_state = ESnormal;
1601 vc->vc_ques = 0;
1602 vc->vc_translate = set_translate(LAT1_MAP, vc);
1603 vc->vc_G0_charset = LAT1_MAP;
1604 vc->vc_G1_charset = GRAF_MAP;
1605 vc->vc_charset = 0;
1606 vc->vc_need_wrap = 0;
1607 vc->vc_report_mouse = 0;
1608 vc->vc_utf = default_utf8;
1609 vc->vc_utf_count = 0;
1610
1611 vc->vc_disp_ctrl = 0;
1612 vc->vc_toggle_meta = 0;
1613
1614 vc->vc_decscnm = 0;
1615 vc->vc_decom = 0;
1616 vc->vc_decawm = 1;
1617 vc->vc_deccm = global_cursor_default;
1618 vc->vc_decim = 0;
1619
1620 vt_reset_keyboard(vc->vc_num);
1621
1622 vc->vc_cursor_type = cur_default;
1623 vc->vc_complement_mask = vc->vc_s_complement_mask;
1624
1625 default_attr(vc);
1626 update_attr(vc);
1627
1628 vc->vc_tab_stop[0] = 0x01010100;
1629 vc->vc_tab_stop[1] =
1630 vc->vc_tab_stop[2] =
1631 vc->vc_tab_stop[3] =
1632 vc->vc_tab_stop[4] =
1633 vc->vc_tab_stop[5] =
1634 vc->vc_tab_stop[6] =
1635 vc->vc_tab_stop[7] = 0x01010101;
1636
1637 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1638 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1639
1640 gotoxy(vc, 0, 0);
1641 save_cur(vc);
1642 if (do_clear)
1643 csi_J(vc, 2);
1644 }
1645
1646 /* console_lock is held */
1647 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1648 {
1649 /*
1650 * Control characters can be used in the _middle_
1651 * of an escape sequence.
1652 */
1653 switch (c) {
1654 case 0:
1655 return;
1656 case 7:
1657 if (vc->vc_bell_duration)
1658 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1659 return;
1660 case 8:
1661 bs(vc);
1662 return;
1663 case 9:
1664 vc->vc_pos -= (vc->vc_x << 1);
1665 while (vc->vc_x < vc->vc_cols - 1) {
1666 vc->vc_x++;
1667 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1668 break;
1669 }
1670 vc->vc_pos += (vc->vc_x << 1);
1671 notify_write(vc, '\t');
1672 return;
1673 case 10: case 11: case 12:
1674 lf(vc);
1675 if (!is_kbd(vc, lnm))
1676 return;
1677 case 13:
1678 cr(vc);
1679 return;
1680 case 14:
1681 vc->vc_charset = 1;
1682 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1683 vc->vc_disp_ctrl = 1;
1684 return;
1685 case 15:
1686 vc->vc_charset = 0;
1687 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1688 vc->vc_disp_ctrl = 0;
1689 return;
1690 case 24: case 26:
1691 vc->vc_state = ESnormal;
1692 return;
1693 case 27:
1694 vc->vc_state = ESesc;
1695 return;
1696 case 127:
1697 del(vc);
1698 return;
1699 case 128+27:
1700 vc->vc_state = ESsquare;
1701 return;
1702 }
1703 switch(vc->vc_state) {
1704 case ESesc:
1705 vc->vc_state = ESnormal;
1706 switch (c) {
1707 case '[':
1708 vc->vc_state = ESsquare;
1709 return;
1710 case ']':
1711 vc->vc_state = ESnonstd;
1712 return;
1713 case '%':
1714 vc->vc_state = ESpercent;
1715 return;
1716 case 'E':
1717 cr(vc);
1718 lf(vc);
1719 return;
1720 case 'M':
1721 ri(vc);
1722 return;
1723 case 'D':
1724 lf(vc);
1725 return;
1726 case 'H':
1727 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1728 return;
1729 case 'Z':
1730 respond_ID(tty);
1731 return;
1732 case '7':
1733 save_cur(vc);
1734 return;
1735 case '8':
1736 restore_cur(vc);
1737 return;
1738 case '(':
1739 vc->vc_state = ESsetG0;
1740 return;
1741 case ')':
1742 vc->vc_state = ESsetG1;
1743 return;
1744 case '#':
1745 vc->vc_state = EShash;
1746 return;
1747 case 'c':
1748 reset_terminal(vc, 1);
1749 return;
1750 case '>': /* Numeric keypad */
1751 clr_kbd(vc, kbdapplic);
1752 return;
1753 case '=': /* Appl. keypad */
1754 set_kbd(vc, kbdapplic);
1755 return;
1756 }
1757 return;
1758 case ESnonstd:
1759 if (c=='P') { /* palette escape sequence */
1760 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1761 vc->vc_par[vc->vc_npar] = 0;
1762 vc->vc_npar = 0;
1763 vc->vc_state = ESpalette;
1764 return;
1765 } else if (c=='R') { /* reset palette */
1766 reset_palette(vc);
1767 vc->vc_state = ESnormal;
1768 } else
1769 vc->vc_state = ESnormal;
1770 return;
1771 case ESpalette:
1772 if (isxdigit(c)) {
1773 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1774 if (vc->vc_npar == 7) {
1775 int i = vc->vc_par[0] * 3, j = 1;
1776 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1777 vc->vc_palette[i++] += vc->vc_par[j++];
1778 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1779 vc->vc_palette[i++] += vc->vc_par[j++];
1780 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1781 vc->vc_palette[i] += vc->vc_par[j];
1782 set_palette(vc);
1783 vc->vc_state = ESnormal;
1784 }
1785 } else
1786 vc->vc_state = ESnormal;
1787 return;
1788 case ESsquare:
1789 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1790 vc->vc_par[vc->vc_npar] = 0;
1791 vc->vc_npar = 0;
1792 vc->vc_state = ESgetpars;
1793 if (c == '[') { /* Function key */
1794 vc->vc_state=ESfunckey;
1795 return;
1796 }
1797 vc->vc_ques = (c == '?');
1798 if (vc->vc_ques)
1799 return;
1800 case ESgetpars:
1801 if (c == ';' && vc->vc_npar < NPAR - 1) {
1802 vc->vc_npar++;
1803 return;
1804 } else if (c>='0' && c<='9') {
1805 vc->vc_par[vc->vc_npar] *= 10;
1806 vc->vc_par[vc->vc_npar] += c - '0';
1807 return;
1808 } else
1809 vc->vc_state = ESgotpars;
1810 case ESgotpars:
1811 vc->vc_state = ESnormal;
1812 switch(c) {
1813 case 'h':
1814 set_mode(vc, 1);
1815 return;
1816 case 'l':
1817 set_mode(vc, 0);
1818 return;
1819 case 'c':
1820 if (vc->vc_ques) {
1821 if (vc->vc_par[0])
1822 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1823 else
1824 vc->vc_cursor_type = cur_default;
1825 return;
1826 }
1827 break;
1828 case 'm':
1829 if (vc->vc_ques) {
1830 clear_selection();
1831 if (vc->vc_par[0])
1832 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1833 else
1834 vc->vc_complement_mask = vc->vc_s_complement_mask;
1835 return;
1836 }
1837 break;
1838 case 'n':
1839 if (!vc->vc_ques) {
1840 if (vc->vc_par[0] == 5)
1841 status_report(tty);
1842 else if (vc->vc_par[0] == 6)
1843 cursor_report(vc, tty);
1844 }
1845 return;
1846 }
1847 if (vc->vc_ques) {
1848 vc->vc_ques = 0;
1849 return;
1850 }
1851 switch(c) {
1852 case 'G': case '`':
1853 if (vc->vc_par[0])
1854 vc->vc_par[0]--;
1855 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1856 return;
1857 case 'A':
1858 if (!vc->vc_par[0])
1859 vc->vc_par[0]++;
1860 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1861 return;
1862 case 'B': case 'e':
1863 if (!vc->vc_par[0])
1864 vc->vc_par[0]++;
1865 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1866 return;
1867 case 'C': case 'a':
1868 if (!vc->vc_par[0])
1869 vc->vc_par[0]++;
1870 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1871 return;
1872 case 'D':
1873 if (!vc->vc_par[0])
1874 vc->vc_par[0]++;
1875 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1876 return;
1877 case 'E':
1878 if (!vc->vc_par[0])
1879 vc->vc_par[0]++;
1880 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1881 return;
1882 case 'F':
1883 if (!vc->vc_par[0])
1884 vc->vc_par[0]++;
1885 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1886 return;
1887 case 'd':
1888 if (vc->vc_par[0])
1889 vc->vc_par[0]--;
1890 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1891 return;
1892 case 'H': case 'f':
1893 if (vc->vc_par[0])
1894 vc->vc_par[0]--;
1895 if (vc->vc_par[1])
1896 vc->vc_par[1]--;
1897 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1898 return;
1899 case 'J':
1900 csi_J(vc, vc->vc_par[0]);
1901 return;
1902 case 'K':
1903 csi_K(vc, vc->vc_par[0]);
1904 return;
1905 case 'L':
1906 csi_L(vc, vc->vc_par[0]);
1907 return;
1908 case 'M':
1909 csi_M(vc, vc->vc_par[0]);
1910 return;
1911 case 'P':
1912 csi_P(vc, vc->vc_par[0]);
1913 return;
1914 case 'c':
1915 if (!vc->vc_par[0])
1916 respond_ID(tty);
1917 return;
1918 case 'g':
1919 if (!vc->vc_par[0])
1920 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1921 else if (vc->vc_par[0] == 3) {
1922 vc->vc_tab_stop[0] =
1923 vc->vc_tab_stop[1] =
1924 vc->vc_tab_stop[2] =
1925 vc->vc_tab_stop[3] =
1926 vc->vc_tab_stop[4] =
1927 vc->vc_tab_stop[5] =
1928 vc->vc_tab_stop[6] =
1929 vc->vc_tab_stop[7] = 0;
1930 }
1931 return;
1932 case 'm':
1933 csi_m(vc);
1934 return;
1935 case 'q': /* DECLL - but only 3 leds */
1936 /* map 0,1,2,3 to 0,1,2,4 */
1937 if (vc->vc_par[0] < 4)
1938 vt_set_led_state(vc->vc_num,
1939 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1940 return;
1941 case 'r':
1942 if (!vc->vc_par[0])
1943 vc->vc_par[0]++;
1944 if (!vc->vc_par[1])
1945 vc->vc_par[1] = vc->vc_rows;
1946 /* Minimum allowed region is 2 lines */
1947 if (vc->vc_par[0] < vc->vc_par[1] &&
1948 vc->vc_par[1] <= vc->vc_rows) {
1949 vc->vc_top = vc->vc_par[0] - 1;
1950 vc->vc_bottom = vc->vc_par[1];
1951 gotoxay(vc, 0, 0);
1952 }
1953 return;
1954 case 's':
1955 save_cur(vc);
1956 return;
1957 case 'u':
1958 restore_cur(vc);
1959 return;
1960 case 'X':
1961 csi_X(vc, vc->vc_par[0]);
1962 return;
1963 case '@':
1964 csi_at(vc, vc->vc_par[0]);
1965 return;
1966 case ']': /* setterm functions */
1967 setterm_command(vc);
1968 return;
1969 }
1970 return;
1971 case ESpercent:
1972 vc->vc_state = ESnormal;
1973 switch (c) {
1974 case '@': /* defined in ISO 2022 */
1975 vc->vc_utf = 0;
1976 return;
1977 case 'G': /* prelim official escape code */
1978 case '8': /* retained for compatibility */
1979 vc->vc_utf = 1;
1980 return;
1981 }
1982 return;
1983 case ESfunckey:
1984 vc->vc_state = ESnormal;
1985 return;
1986 case EShash:
1987 vc->vc_state = ESnormal;
1988 if (c == '8') {
1989 /* DEC screen alignment test. kludge :-) */
1990 vc->vc_video_erase_char =
1991 (vc->vc_video_erase_char & 0xff00) | 'E';
1992 csi_J(vc, 2);
1993 vc->vc_video_erase_char =
1994 (vc->vc_video_erase_char & 0xff00) | ' ';
1995 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1996 }
1997 return;
1998 case ESsetG0:
1999 if (c == '0')
2000 vc->vc_G0_charset = GRAF_MAP;
2001 else if (c == 'B')
2002 vc->vc_G0_charset = LAT1_MAP;
2003 else if (c == 'U')
2004 vc->vc_G0_charset = IBMPC_MAP;
2005 else if (c == 'K')
2006 vc->vc_G0_charset = USER_MAP;
2007 if (vc->vc_charset == 0)
2008 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2009 vc->vc_state = ESnormal;
2010 return;
2011 case ESsetG1:
2012 if (c == '0')
2013 vc->vc_G1_charset = GRAF_MAP;
2014 else if (c == 'B')
2015 vc->vc_G1_charset = LAT1_MAP;
2016 else if (c == 'U')
2017 vc->vc_G1_charset = IBMPC_MAP;
2018 else if (c == 'K')
2019 vc->vc_G1_charset = USER_MAP;
2020 if (vc->vc_charset == 1)
2021 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2022 vc->vc_state = ESnormal;
2023 return;
2024 default:
2025 vc->vc_state = ESnormal;
2026 }
2027 }
2028
2029 /* is_double_width() is based on the wcwidth() implementation by
2030 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2031 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2032 */
2033 struct interval {
2034 uint32_t first;
2035 uint32_t last;
2036 };
2037
2038 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2039 {
2040 int min = 0;
2041 int mid;
2042
2043 if (ucs < table[0].first || ucs > table[max].last)
2044 return 0;
2045 while (max >= min) {
2046 mid = (min + max) / 2;
2047 if (ucs > table[mid].last)
2048 min = mid + 1;
2049 else if (ucs < table[mid].first)
2050 max = mid - 1;
2051 else
2052 return 1;
2053 }
2054 return 0;
2055 }
2056
2057 static int is_double_width(uint32_t ucs)
2058 {
2059 static const struct interval double_width[] = {
2060 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2061 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2062 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2063 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2064 };
2065 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2066 }
2067
2068 /* acquires console_lock */
2069 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2070 {
2071 #ifdef VT_BUF_VRAM_ONLY
2072 #define FLUSH do { } while(0);
2073 #else
2074 #define FLUSH if (draw_x >= 0) { \
2075 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2076 draw_x = -1; \
2077 }
2078 #endif
2079
2080 int c, tc, ok, n = 0, draw_x = -1;
2081 unsigned int currcons;
2082 unsigned long draw_from = 0, draw_to = 0;
2083 struct vc_data *vc;
2084 unsigned char vc_attr;
2085 struct vt_notifier_param param;
2086 uint8_t rescan;
2087 uint8_t inverse;
2088 uint8_t width;
2089 u16 himask, charmask;
2090
2091 if (in_interrupt())
2092 return count;
2093
2094 might_sleep();
2095
2096 console_lock();
2097 vc = tty->driver_data;
2098 if (vc == NULL) {
2099 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2100 console_unlock();
2101 return 0;
2102 }
2103
2104 currcons = vc->vc_num;
2105 if (!vc_cons_allocated(currcons)) {
2106 /* could this happen? */
2107 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2108 console_unlock();
2109 return 0;
2110 }
2111
2112 himask = vc->vc_hi_font_mask;
2113 charmask = himask ? 0x1ff : 0xff;
2114
2115 /* undraw cursor first */
2116 if (IS_FG(vc))
2117 hide_cursor(vc);
2118
2119 param.vc = vc;
2120
2121 while (!tty->stopped && count) {
2122 int orig = *buf;
2123 c = orig;
2124 buf++;
2125 n++;
2126 count--;
2127 rescan = 0;
2128 inverse = 0;
2129 width = 1;
2130
2131 /* Do no translation at all in control states */
2132 if (vc->vc_state != ESnormal) {
2133 tc = c;
2134 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2135 /* Combine UTF-8 into Unicode in vc_utf_char.
2136 * vc_utf_count is the number of continuation bytes still
2137 * expected to arrive.
2138 * vc_npar is the number of continuation bytes arrived so
2139 * far
2140 */
2141 rescan_last_byte:
2142 if ((c & 0xc0) == 0x80) {
2143 /* Continuation byte received */
2144 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2145 if (vc->vc_utf_count) {
2146 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2147 vc->vc_npar++;
2148 if (--vc->vc_utf_count) {
2149 /* Still need some bytes */
2150 continue;
2151 }
2152 /* Got a whole character */
2153 c = vc->vc_utf_char;
2154 /* Reject overlong sequences */
2155 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2156 c > utf8_length_changes[vc->vc_npar])
2157 c = 0xfffd;
2158 } else {
2159 /* Unexpected continuation byte */
2160 vc->vc_utf_count = 0;
2161 c = 0xfffd;
2162 }
2163 } else {
2164 /* Single ASCII byte or first byte of a sequence received */
2165 if (vc->vc_utf_count) {
2166 /* Continuation byte expected */
2167 rescan = 1;
2168 vc->vc_utf_count = 0;
2169 c = 0xfffd;
2170 } else if (c > 0x7f) {
2171 /* First byte of a multibyte sequence received */
2172 vc->vc_npar = 0;
2173 if ((c & 0xe0) == 0xc0) {
2174 vc->vc_utf_count = 1;
2175 vc->vc_utf_char = (c & 0x1f);
2176 } else if ((c & 0xf0) == 0xe0) {
2177 vc->vc_utf_count = 2;
2178 vc->vc_utf_char = (c & 0x0f);
2179 } else if ((c & 0xf8) == 0xf0) {
2180 vc->vc_utf_count = 3;
2181 vc->vc_utf_char = (c & 0x07);
2182 } else if ((c & 0xfc) == 0xf8) {
2183 vc->vc_utf_count = 4;
2184 vc->vc_utf_char = (c & 0x03);
2185 } else if ((c & 0xfe) == 0xfc) {
2186 vc->vc_utf_count = 5;
2187 vc->vc_utf_char = (c & 0x01);
2188 } else {
2189 /* 254 and 255 are invalid */
2190 c = 0xfffd;
2191 }
2192 if (vc->vc_utf_count) {
2193 /* Still need some bytes */
2194 continue;
2195 }
2196 }
2197 /* Nothing to do if an ASCII byte was received */
2198 }
2199 /* End of UTF-8 decoding. */
2200 /* c is the received character, or U+FFFD for invalid sequences. */
2201 /* Replace invalid Unicode code points with U+FFFD too */
2202 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2203 c = 0xfffd;
2204 tc = c;
2205 } else { /* no utf or alternate charset mode */
2206 tc = vc_translate(vc, c);
2207 }
2208
2209 param.c = tc;
2210 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2211 &param) == NOTIFY_STOP)
2212 continue;
2213
2214 /* If the original code was a control character we
2215 * only allow a glyph to be displayed if the code is
2216 * not normally used (such as for cursor movement) or
2217 * if the disp_ctrl mode has been explicitly enabled.
2218 * Certain characters (as given by the CTRL_ALWAYS
2219 * bitmap) are always displayed as control characters,
2220 * as the console would be pretty useless without
2221 * them; to display an arbitrary font position use the
2222 * direct-to-font zone in UTF-8 mode.
2223 */
2224 ok = tc && (c >= 32 ||
2225 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2226 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2227 && (c != 127 || vc->vc_disp_ctrl)
2228 && (c != 128+27);
2229
2230 if (vc->vc_state == ESnormal && ok) {
2231 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2232 if (is_double_width(c))
2233 width = 2;
2234 }
2235 /* Now try to find out how to display it */
2236 tc = conv_uni_to_pc(vc, tc);
2237 if (tc & ~charmask) {
2238 if (tc == -1 || tc == -2) {
2239 continue; /* nothing to display */
2240 }
2241 /* Glyph not found */
2242 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2243 /* In legacy mode use the glyph we get by a 1:1 mapping.
2244 This would make absolutely no sense with Unicode in mind,
2245 but do this for ASCII characters since a font may lack
2246 Unicode mapping info and we don't want to end up with
2247 having question marks only. */
2248 tc = c;
2249 } else {
2250 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2251 tc = conv_uni_to_pc(vc, 0xfffd);
2252 if (tc < 0) {
2253 inverse = 1;
2254 tc = conv_uni_to_pc(vc, '?');
2255 if (tc < 0) tc = '?';
2256 }
2257 }
2258 }
2259
2260 if (!inverse) {
2261 vc_attr = vc->vc_attr;
2262 } else {
2263 /* invert vc_attr */
2264 if (!vc->vc_can_do_color) {
2265 vc_attr = (vc->vc_attr) ^ 0x08;
2266 } else if (vc->vc_hi_font_mask == 0x100) {
2267 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2268 } else {
2269 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2270 }
2271 FLUSH
2272 }
2273
2274 while (1) {
2275 if (vc->vc_need_wrap || vc->vc_decim)
2276 FLUSH
2277 if (vc->vc_need_wrap) {
2278 cr(vc);
2279 lf(vc);
2280 }
2281 if (vc->vc_decim)
2282 insert_char(vc, 1);
2283 scr_writew(himask ?
2284 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2285 (vc_attr << 8) + tc,
2286 (u16 *) vc->vc_pos);
2287 if (DO_UPDATE(vc) && draw_x < 0) {
2288 draw_x = vc->vc_x;
2289 draw_from = vc->vc_pos;
2290 }
2291 if (vc->vc_x == vc->vc_cols - 1) {
2292 vc->vc_need_wrap = vc->vc_decawm;
2293 draw_to = vc->vc_pos + 2;
2294 } else {
2295 vc->vc_x++;
2296 draw_to = (vc->vc_pos += 2);
2297 }
2298
2299 if (!--width) break;
2300
2301 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2302 if (tc < 0) tc = ' ';
2303 }
2304 notify_write(vc, c);
2305
2306 if (inverse) {
2307 FLUSH
2308 }
2309
2310 if (rescan) {
2311 rescan = 0;
2312 inverse = 0;
2313 width = 1;
2314 c = orig;
2315 goto rescan_last_byte;
2316 }
2317 continue;
2318 }
2319 FLUSH
2320 do_con_trol(tty, vc, orig);
2321 }
2322 FLUSH
2323 console_conditional_schedule();
2324 console_unlock();
2325 notify_update(vc);
2326 return n;
2327 #undef FLUSH
2328 }
2329
2330 /*
2331 * This is the console switching callback.
2332 *
2333 * Doing console switching in a process context allows
2334 * us to do the switches asynchronously (needed when we want
2335 * to switch due to a keyboard interrupt). Synchronization
2336 * with other console code and prevention of re-entrancy is
2337 * ensured with console_lock.
2338 */
2339 static void console_callback(struct work_struct *ignored)
2340 {
2341 console_lock();
2342
2343 if (want_console >= 0) {
2344 if (want_console != fg_console &&
2345 vc_cons_allocated(want_console)) {
2346 hide_cursor(vc_cons[fg_console].d);
2347 change_console(vc_cons[want_console].d);
2348 /* we only changed when the console had already
2349 been allocated - a new console is not created
2350 in an interrupt routine */
2351 }
2352 want_console = -1;
2353 }
2354 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2355 do_poke_blanked_console = 0;
2356 poke_blanked_console();
2357 }
2358 if (scrollback_delta) {
2359 struct vc_data *vc = vc_cons[fg_console].d;
2360 clear_selection();
2361 if (vc->vc_mode == KD_TEXT)
2362 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2363 scrollback_delta = 0;
2364 }
2365 if (blank_timer_expired) {
2366 do_blank_screen(0);
2367 blank_timer_expired = 0;
2368 }
2369 notify_update(vc_cons[fg_console].d);
2370
2371 console_unlock();
2372 }
2373
2374 int set_console(int nr)
2375 {
2376 struct vc_data *vc = vc_cons[fg_console].d;
2377
2378 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2379 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2380
2381 /*
2382 * Console switch will fail in console_callback() or
2383 * change_console() so there is no point scheduling
2384 * the callback
2385 *
2386 * Existing set_console() users don't check the return
2387 * value so this shouldn't break anything
2388 */
2389 return -EINVAL;
2390 }
2391
2392 want_console = nr;
2393 schedule_console_callback();
2394
2395 return 0;
2396 }
2397
2398 struct tty_driver *console_driver;
2399
2400 #ifdef CONFIG_VT_CONSOLE
2401
2402 /**
2403 * vt_kmsg_redirect() - Sets/gets the kernel message console
2404 * @new: The new virtual terminal number or -1 if the console should stay
2405 * unchanged
2406 *
2407 * By default, the kernel messages are always printed on the current virtual
2408 * console. However, the user may modify that default with the
2409 * TIOCL_SETKMSGREDIRECT ioctl call.
2410 *
2411 * This function sets the kernel message console to be @new. It returns the old
2412 * virtual console number. The virtual terminal number 0 (both as parameter and
2413 * return value) means no redirection (i.e. always printed on the currently
2414 * active console).
2415 *
2416 * The parameter -1 means that only the current console is returned, but the
2417 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2418 * case to make the code more understandable.
2419 *
2420 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2421 * the parameter and always returns 0.
2422 */
2423 int vt_kmsg_redirect(int new)
2424 {
2425 static int kmsg_con;
2426
2427 if (new != -1)
2428 return xchg(&kmsg_con, new);
2429 else
2430 return kmsg_con;
2431 }
2432
2433 /*
2434 * Console on virtual terminal
2435 *
2436 * The console must be locked when we get here.
2437 */
2438
2439 static void vt_console_print(struct console *co, const char *b, unsigned count)
2440 {
2441 struct vc_data *vc = vc_cons[fg_console].d;
2442 unsigned char c;
2443 static DEFINE_SPINLOCK(printing_lock);
2444 const ushort *start;
2445 ushort cnt = 0;
2446 ushort myx;
2447 int kmsg_console;
2448
2449 /* console busy or not yet initialized */
2450 if (!printable)
2451 return;
2452 if (!spin_trylock(&printing_lock))
2453 return;
2454
2455 kmsg_console = vt_get_kmsg_redirect();
2456 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2457 vc = vc_cons[kmsg_console - 1].d;
2458
2459 /* read `x' only after setting currcons properly (otherwise
2460 the `x' macro will read the x of the foreground console). */
2461 myx = vc->vc_x;
2462
2463 if (!vc_cons_allocated(fg_console)) {
2464 /* impossible */
2465 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2466 goto quit;
2467 }
2468
2469 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2470 goto quit;
2471
2472 /* undraw cursor first */
2473 if (IS_FG(vc))
2474 hide_cursor(vc);
2475
2476 start = (ushort *)vc->vc_pos;
2477
2478 /* Contrived structure to try to emulate original need_wrap behaviour
2479 * Problems caused when we have need_wrap set on '\n' character */
2480 while (count--) {
2481 c = *b++;
2482 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2483 if (cnt > 0) {
2484 if (CON_IS_VISIBLE(vc))
2485 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2486 vc->vc_x += cnt;
2487 if (vc->vc_need_wrap)
2488 vc->vc_x--;
2489 cnt = 0;
2490 }
2491 if (c == 8) { /* backspace */
2492 bs(vc);
2493 start = (ushort *)vc->vc_pos;
2494 myx = vc->vc_x;
2495 continue;
2496 }
2497 if (c != 13)
2498 lf(vc);
2499 cr(vc);
2500 start = (ushort *)vc->vc_pos;
2501 myx = vc->vc_x;
2502 if (c == 10 || c == 13)
2503 continue;
2504 }
2505 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2506 notify_write(vc, c);
2507 cnt++;
2508 if (myx == vc->vc_cols - 1) {
2509 vc->vc_need_wrap = 1;
2510 continue;
2511 }
2512 vc->vc_pos += 2;
2513 myx++;
2514 }
2515 if (cnt > 0) {
2516 if (CON_IS_VISIBLE(vc))
2517 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2518 vc->vc_x += cnt;
2519 if (vc->vc_x == vc->vc_cols) {
2520 vc->vc_x--;
2521 vc->vc_need_wrap = 1;
2522 }
2523 }
2524 set_cursor(vc);
2525 notify_update(vc);
2526
2527 quit:
2528 spin_unlock(&printing_lock);
2529 }
2530
2531 static struct tty_driver *vt_console_device(struct console *c, int *index)
2532 {
2533 *index = c->index ? c->index-1 : fg_console;
2534 return console_driver;
2535 }
2536
2537 static struct console vt_console_driver = {
2538 .name = "tty",
2539 .write = vt_console_print,
2540 .device = vt_console_device,
2541 .unblank = unblank_screen,
2542 .flags = CON_PRINTBUFFER,
2543 .index = -1,
2544 };
2545 #endif
2546
2547 /*
2548 * Handling of Linux-specific VC ioctls
2549 */
2550
2551 /*
2552 * Generally a bit racy with respect to console_lock();.
2553 *
2554 * There are some functions which don't need it.
2555 *
2556 * There are some functions which can sleep for arbitrary periods
2557 * (paste_selection) but we don't need the lock there anyway.
2558 *
2559 * set_selection has locking, and definitely needs it
2560 */
2561
2562 int tioclinux(struct tty_struct *tty, unsigned long arg)
2563 {
2564 char type, data;
2565 char __user *p = (char __user *)arg;
2566 int lines;
2567 int ret;
2568
2569 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2570 return -EPERM;
2571 if (get_user(type, p))
2572 return -EFAULT;
2573 ret = 0;
2574
2575 switch (type)
2576 {
2577 case TIOCL_SETSEL:
2578 console_lock();
2579 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2580 console_unlock();
2581 break;
2582 case TIOCL_PASTESEL:
2583 ret = paste_selection(tty);
2584 break;
2585 case TIOCL_UNBLANKSCREEN:
2586 console_lock();
2587 unblank_screen();
2588 console_unlock();
2589 break;
2590 case TIOCL_SELLOADLUT:
2591 console_lock();
2592 ret = sel_loadlut(p);
2593 console_unlock();
2594 break;
2595 case TIOCL_GETSHIFTSTATE:
2596
2597 /*
2598 * Make it possible to react to Shift+Mousebutton.
2599 * Note that 'shift_state' is an undocumented
2600 * kernel-internal variable; programs not closely
2601 * related to the kernel should not use this.
2602 */
2603 data = vt_get_shift_state();
2604 ret = __put_user(data, p);
2605 break;
2606 case TIOCL_GETMOUSEREPORTING:
2607 console_lock(); /* May be overkill */
2608 data = mouse_reporting();
2609 console_unlock();
2610 ret = __put_user(data, p);
2611 break;
2612 case TIOCL_SETVESABLANK:
2613 console_lock();
2614 ret = set_vesa_blanking(p);
2615 console_unlock();
2616 break;
2617 case TIOCL_GETKMSGREDIRECT:
2618 data = vt_get_kmsg_redirect();
2619 ret = __put_user(data, p);
2620 break;
2621 case TIOCL_SETKMSGREDIRECT:
2622 if (!capable(CAP_SYS_ADMIN)) {
2623 ret = -EPERM;
2624 } else {
2625 if (get_user(data, p+1))
2626 ret = -EFAULT;
2627 else
2628 vt_kmsg_redirect(data);
2629 }
2630 break;
2631 case TIOCL_GETFGCONSOLE:
2632 /* No locking needed as this is a transiently
2633 correct return anyway if the caller hasn't
2634 disabled switching */
2635 ret = fg_console;
2636 break;
2637 case TIOCL_SCROLLCONSOLE:
2638 if (get_user(lines, (s32 __user *)(p+4))) {
2639 ret = -EFAULT;
2640 } else {
2641 /* Need the console lock here. Note that lots
2642 of other calls need fixing before the lock
2643 is actually useful ! */
2644 console_lock();
2645 scrollfront(vc_cons[fg_console].d, lines);
2646 console_unlock();
2647 ret = 0;
2648 }
2649 break;
2650 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2651 console_lock();
2652 ignore_poke = 1;
2653 do_blank_screen(0);
2654 console_unlock();
2655 break;
2656 case TIOCL_BLANKEDSCREEN:
2657 ret = console_blanked;
2658 break;
2659 default:
2660 ret = -EINVAL;
2661 break;
2662 }
2663 return ret;
2664 }
2665
2666 /*
2667 * /dev/ttyN handling
2668 */
2669
2670 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2671 {
2672 int retval;
2673
2674 retval = do_con_write(tty, buf, count);
2675 con_flush_chars(tty);
2676
2677 return retval;
2678 }
2679
2680 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2681 {
2682 if (in_interrupt())
2683 return 0; /* n_r3964 calls put_char() from interrupt context */
2684 return do_con_write(tty, &ch, 1);
2685 }
2686
2687 static int con_write_room(struct tty_struct *tty)
2688 {
2689 if (tty->stopped)
2690 return 0;
2691 return 32768; /* No limit, really; we're not buffering */
2692 }
2693
2694 static int con_chars_in_buffer(struct tty_struct *tty)
2695 {
2696 return 0; /* we're not buffering */
2697 }
2698
2699 /*
2700 * con_throttle and con_unthrottle are only used for
2701 * paste_selection(), which has to stuff in a large number of
2702 * characters...
2703 */
2704 static void con_throttle(struct tty_struct *tty)
2705 {
2706 }
2707
2708 static void con_unthrottle(struct tty_struct *tty)
2709 {
2710 struct vc_data *vc = tty->driver_data;
2711
2712 wake_up_interruptible(&vc->paste_wait);
2713 }
2714
2715 /*
2716 * Turn the Scroll-Lock LED on when the tty is stopped
2717 */
2718 static void con_stop(struct tty_struct *tty)
2719 {
2720 int console_num;
2721 if (!tty)
2722 return;
2723 console_num = tty->index;
2724 if (!vc_cons_allocated(console_num))
2725 return;
2726 vt_kbd_con_stop(console_num);
2727 }
2728
2729 /*
2730 * Turn the Scroll-Lock LED off when the console is started
2731 */
2732 static void con_start(struct tty_struct *tty)
2733 {
2734 int console_num;
2735 if (!tty)
2736 return;
2737 console_num = tty->index;
2738 if (!vc_cons_allocated(console_num))
2739 return;
2740 vt_kbd_con_start(console_num);
2741 }
2742
2743 static void con_flush_chars(struct tty_struct *tty)
2744 {
2745 struct vc_data *vc;
2746
2747 if (in_interrupt()) /* from flush_to_ldisc */
2748 return;
2749
2750 /* if we race with con_close(), vt may be null */
2751 console_lock();
2752 vc = tty->driver_data;
2753 if (vc)
2754 set_cursor(vc);
2755 console_unlock();
2756 }
2757
2758 /*
2759 * Allocate the console screen memory.
2760 */
2761 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2762 {
2763 unsigned int currcons = tty->index;
2764 struct vc_data *vc;
2765 int ret;
2766
2767 console_lock();
2768 ret = vc_allocate(currcons);
2769 if (ret)
2770 goto unlock;
2771
2772 vc = vc_cons[currcons].d;
2773
2774 /* Still being freed */
2775 if (vc->port.tty) {
2776 ret = -ERESTARTSYS;
2777 goto unlock;
2778 }
2779
2780 ret = tty_port_install(&vc->port, driver, tty);
2781 if (ret)
2782 goto unlock;
2783
2784 tty->driver_data = vc;
2785 vc->port.tty = tty;
2786
2787 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2788 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2789 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2790 }
2791 if (vc->vc_utf)
2792 tty->termios.c_iflag |= IUTF8;
2793 else
2794 tty->termios.c_iflag &= ~IUTF8;
2795 unlock:
2796 console_unlock();
2797 return ret;
2798 }
2799
2800 static int con_open(struct tty_struct *tty, struct file *filp)
2801 {
2802 /* everything done in install */
2803 return 0;
2804 }
2805
2806
2807 static void con_close(struct tty_struct *tty, struct file *filp)
2808 {
2809 /* Nothing to do - we defer to shutdown */
2810 }
2811
2812 static void con_shutdown(struct tty_struct *tty)
2813 {
2814 struct vc_data *vc = tty->driver_data;
2815 BUG_ON(vc == NULL);
2816 console_lock();
2817 vc->port.tty = NULL;
2818 console_unlock();
2819 }
2820
2821 static int default_color = 7; /* white */
2822 static int default_italic_color = 2; // green (ASCII)
2823 static int default_underline_color = 3; // cyan (ASCII)
2824 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2825 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2826 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2827
2828 static void vc_init(struct vc_data *vc, unsigned int rows,
2829 unsigned int cols, int do_clear)
2830 {
2831 int j, k ;
2832
2833 vc->vc_cols = cols;
2834 vc->vc_rows = rows;
2835 vc->vc_size_row = cols << 1;
2836 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2837
2838 set_origin(vc);
2839 vc->vc_pos = vc->vc_origin;
2840 reset_vc(vc);
2841 for (j=k=0; j<16; j++) {
2842 vc->vc_palette[k++] = default_red[j] ;
2843 vc->vc_palette[k++] = default_grn[j] ;
2844 vc->vc_palette[k++] = default_blu[j] ;
2845 }
2846 vc->vc_def_color = default_color;
2847 vc->vc_ulcolor = default_underline_color;
2848 vc->vc_itcolor = default_italic_color;
2849 vc->vc_halfcolor = 0x08; /* grey */
2850 init_waitqueue_head(&vc->paste_wait);
2851 reset_terminal(vc, do_clear);
2852 }
2853
2854 /*
2855 * This routine initializes console interrupts, and does nothing
2856 * else. If you want the screen to clear, call tty_write with
2857 * the appropriate escape-sequence.
2858 */
2859
2860 static int __init con_init(void)
2861 {
2862 const char *display_desc = NULL;
2863 struct vc_data *vc;
2864 unsigned int currcons = 0, i;
2865
2866 console_lock();
2867
2868 if (conswitchp)
2869 display_desc = conswitchp->con_startup();
2870 if (!display_desc) {
2871 fg_console = 0;
2872 console_unlock();
2873 return 0;
2874 }
2875
2876 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2877 struct con_driver *con_driver = &registered_con_driver[i];
2878
2879 if (con_driver->con == NULL) {
2880 con_driver->con = conswitchp;
2881 con_driver->desc = display_desc;
2882 con_driver->flag = CON_DRIVER_FLAG_INIT;
2883 con_driver->first = 0;
2884 con_driver->last = MAX_NR_CONSOLES - 1;
2885 break;
2886 }
2887 }
2888
2889 for (i = 0; i < MAX_NR_CONSOLES; i++)
2890 con_driver_map[i] = conswitchp;
2891
2892 if (blankinterval) {
2893 blank_state = blank_normal_wait;
2894 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2895 }
2896
2897 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2898 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2899 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2900 tty_port_init(&vc->port);
2901 visual_init(vc, currcons, 1);
2902 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2903 vc_init(vc, vc->vc_rows, vc->vc_cols,
2904 currcons || !vc->vc_sw->con_save_screen);
2905 }
2906 currcons = fg_console = 0;
2907 master_display_fg = vc = vc_cons[currcons].d;
2908 set_origin(vc);
2909 save_screen(vc);
2910 gotoxy(vc, vc->vc_x, vc->vc_y);
2911 csi_J(vc, 0);
2912 update_screen(vc);
2913 pr_info("Console: %s %s %dx%d\n",
2914 vc->vc_can_do_color ? "colour" : "mono",
2915 display_desc, vc->vc_cols, vc->vc_rows);
2916 printable = 1;
2917
2918 console_unlock();
2919
2920 #ifdef CONFIG_VT_CONSOLE
2921 register_console(&vt_console_driver);
2922 #endif
2923 return 0;
2924 }
2925 console_initcall(con_init);
2926
2927 static const struct tty_operations con_ops = {
2928 .install = con_install,
2929 .open = con_open,
2930 .close = con_close,
2931 .write = con_write,
2932 .write_room = con_write_room,
2933 .put_char = con_put_char,
2934 .flush_chars = con_flush_chars,
2935 .chars_in_buffer = con_chars_in_buffer,
2936 .ioctl = vt_ioctl,
2937 #ifdef CONFIG_COMPAT
2938 .compat_ioctl = vt_compat_ioctl,
2939 #endif
2940 .stop = con_stop,
2941 .start = con_start,
2942 .throttle = con_throttle,
2943 .unthrottle = con_unthrottle,
2944 .resize = vt_resize,
2945 .shutdown = con_shutdown
2946 };
2947
2948 static struct cdev vc0_cdev;
2949
2950 static ssize_t show_tty_active(struct device *dev,
2951 struct device_attribute *attr, char *buf)
2952 {
2953 return sprintf(buf, "tty%d\n", fg_console + 1);
2954 }
2955 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2956
2957 int __init vty_init(const struct file_operations *console_fops)
2958 {
2959 cdev_init(&vc0_cdev, console_fops);
2960 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2961 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2962 panic("Couldn't register /dev/tty0 driver\n");
2963 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2964 if (IS_ERR(tty0dev))
2965 tty0dev = NULL;
2966 else
2967 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2968
2969 vcs_init();
2970
2971 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2972 if (!console_driver)
2973 panic("Couldn't allocate console driver\n");
2974
2975 console_driver->name = "tty";
2976 console_driver->name_base = 1;
2977 console_driver->major = TTY_MAJOR;
2978 console_driver->minor_start = 1;
2979 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2980 console_driver->init_termios = tty_std_termios;
2981 if (default_utf8)
2982 console_driver->init_termios.c_iflag |= IUTF8;
2983 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2984 tty_set_operations(console_driver, &con_ops);
2985 if (tty_register_driver(console_driver))
2986 panic("Couldn't register console driver\n");
2987 kbd_init();
2988 console_map_init();
2989 #ifdef CONFIG_MDA_CONSOLE
2990 mda_console_init();
2991 #endif
2992 return 0;
2993 }
2994
2995 #ifndef VT_SINGLE_DRIVER
2996
2997 static struct class *vtconsole_class;
2998
2999 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3000 int deflt)
3001 {
3002 struct module *owner = csw->owner;
3003 const char *desc = NULL;
3004 struct con_driver *con_driver;
3005 int i, j = -1, k = -1, retval = -ENODEV;
3006
3007 if (!try_module_get(owner))
3008 return -ENODEV;
3009
3010 WARN_CONSOLE_UNLOCKED();
3011
3012 /* check if driver is registered */
3013 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3014 con_driver = &registered_con_driver[i];
3015
3016 if (con_driver->con == csw) {
3017 desc = con_driver->desc;
3018 retval = 0;
3019 break;
3020 }
3021 }
3022
3023 if (retval)
3024 goto err;
3025
3026 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3027 csw->con_startup();
3028 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3029 }
3030
3031 if (deflt) {
3032 if (conswitchp)
3033 module_put(conswitchp->owner);
3034
3035 __module_get(owner);
3036 conswitchp = csw;
3037 }
3038
3039 first = max(first, con_driver->first);
3040 last = min(last, con_driver->last);
3041
3042 for (i = first; i <= last; i++) {
3043 int old_was_color;
3044 struct vc_data *vc = vc_cons[i].d;
3045
3046 if (con_driver_map[i])
3047 module_put(con_driver_map[i]->owner);
3048 __module_get(owner);
3049 con_driver_map[i] = csw;
3050
3051 if (!vc || !vc->vc_sw)
3052 continue;
3053
3054 j = i;
3055
3056 if (CON_IS_VISIBLE(vc)) {
3057 k = i;
3058 save_screen(vc);
3059 }
3060
3061 old_was_color = vc->vc_can_do_color;
3062 vc->vc_sw->con_deinit(vc);
3063 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3064 visual_init(vc, i, 0);
3065 set_origin(vc);
3066 update_attr(vc);
3067
3068 /* If the console changed between mono <-> color, then
3069 * the attributes in the screenbuf will be wrong. The
3070 * following resets all attributes to something sane.
3071 */
3072 if (old_was_color != vc->vc_can_do_color)
3073 clear_buffer_attributes(vc);
3074 }
3075
3076 pr_info("Console: switching ");
3077 if (!deflt)
3078 printk("consoles %d-%d ", first+1, last+1);
3079 if (j >= 0) {
3080 struct vc_data *vc = vc_cons[j].d;
3081
3082 printk("to %s %s %dx%d\n",
3083 vc->vc_can_do_color ? "colour" : "mono",
3084 desc, vc->vc_cols, vc->vc_rows);
3085
3086 if (k >= 0) {
3087 vc = vc_cons[k].d;
3088 update_screen(vc);
3089 }
3090 } else
3091 printk("to %s\n", desc);
3092
3093 retval = 0;
3094 err:
3095 module_put(owner);
3096 return retval;
3097 };
3098
3099
3100 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3101 static int con_is_graphics(const struct consw *csw, int first, int last)
3102 {
3103 int i, retval = 0;
3104
3105 for (i = first; i <= last; i++) {
3106 struct vc_data *vc = vc_cons[i].d;
3107
3108 if (vc && vc->vc_mode == KD_GRAPHICS) {
3109 retval = 1;
3110 break;
3111 }
3112 }
3113
3114 return retval;
3115 }
3116
3117 /* unlocked version of unbind_con_driver() */
3118 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3119 {
3120 struct module *owner = csw->owner;
3121 const struct consw *defcsw = NULL;
3122 struct con_driver *con_driver = NULL, *con_back = NULL;
3123 int i, retval = -ENODEV;
3124
3125 if (!try_module_get(owner))
3126 return -ENODEV;
3127
3128 WARN_CONSOLE_UNLOCKED();
3129
3130 /* check if driver is registered and if it is unbindable */
3131 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3132 con_driver = &registered_con_driver[i];
3133
3134 if (con_driver->con == csw &&
3135 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3136 retval = 0;
3137 break;
3138 }
3139 }
3140
3141 if (retval)
3142 goto err;
3143
3144 retval = -ENODEV;
3145
3146 /* check if backup driver exists */
3147 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3148 con_back = &registered_con_driver[i];
3149
3150 if (con_back->con &&
3151 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3152 defcsw = con_back->con;
3153 retval = 0;
3154 break;
3155 }
3156 }
3157
3158 if (retval)
3159 goto err;
3160
3161 if (!con_is_bound(csw))
3162 goto err;
3163
3164 first = max(first, con_driver->first);
3165 last = min(last, con_driver->last);
3166
3167 for (i = first; i <= last; i++) {
3168 if (con_driver_map[i] == csw) {
3169 module_put(csw->owner);
3170 con_driver_map[i] = NULL;
3171 }
3172 }
3173
3174 if (!con_is_bound(defcsw)) {
3175 const struct consw *defconsw = conswitchp;
3176
3177 defcsw->con_startup();
3178 con_back->flag |= CON_DRIVER_FLAG_INIT;
3179 /*
3180 * vgacon may change the default driver to point
3181 * to dummycon, we restore it here...
3182 */
3183 conswitchp = defconsw;
3184 }
3185
3186 if (!con_is_bound(csw))
3187 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3188
3189 /* ignore return value, binding should not fail */
3190 do_bind_con_driver(defcsw, first, last, deflt);
3191 err:
3192 module_put(owner);
3193 return retval;
3194
3195 }
3196 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3197
3198 static int vt_bind(struct con_driver *con)
3199 {
3200 const struct consw *defcsw = NULL, *csw = NULL;
3201 int i, more = 1, first = -1, last = -1, deflt = 0;
3202
3203 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3204 con_is_graphics(con->con, con->first, con->last))
3205 goto err;
3206
3207 csw = con->con;
3208
3209 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3210 struct con_driver *con = &registered_con_driver[i];
3211
3212 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3213 defcsw = con->con;
3214 break;
3215 }
3216 }
3217
3218 if (!defcsw)
3219 goto err;
3220
3221 while (more) {
3222 more = 0;
3223
3224 for (i = con->first; i <= con->last; i++) {
3225 if (con_driver_map[i] == defcsw) {
3226 if (first == -1)
3227 first = i;
3228 last = i;
3229 more = 1;
3230 } else if (first != -1)
3231 break;
3232 }
3233
3234 if (first == 0 && last == MAX_NR_CONSOLES -1)
3235 deflt = 1;
3236
3237 if (first != -1) {
3238 console_lock();
3239 do_bind_con_driver(csw, first, last, deflt);
3240 console_unlock();
3241 }
3242
3243 first = -1;
3244 last = -1;
3245 deflt = 0;
3246 }
3247
3248 err:
3249 return 0;
3250 }
3251
3252 static int vt_unbind(struct con_driver *con)
3253 {
3254 const struct consw *csw = NULL;
3255 int i, more = 1, first = -1, last = -1, deflt = 0;
3256
3257 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3258 con_is_graphics(con->con, con->first, con->last))
3259 goto err;
3260
3261 csw = con->con;
3262
3263 while (more) {
3264 more = 0;
3265
3266 for (i = con->first; i <= con->last; i++) {
3267 if (con_driver_map[i] == csw) {
3268 if (first == -1)
3269 first = i;
3270 last = i;
3271 more = 1;
3272 } else if (first != -1)
3273 break;
3274 }
3275
3276 if (first == 0 && last == MAX_NR_CONSOLES -1)
3277 deflt = 1;
3278
3279 if (first != -1) {
3280 console_lock();
3281 do_unbind_con_driver(csw, first, last, deflt);
3282 console_unlock();
3283 }
3284
3285 first = -1;
3286 last = -1;
3287 deflt = 0;
3288 }
3289
3290 err:
3291 return 0;
3292 }
3293 #else
3294 static inline int vt_bind(struct con_driver *con)
3295 {
3296 return 0;
3297 }
3298 static inline int vt_unbind(struct con_driver *con)
3299 {
3300 return 0;
3301 }
3302 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3303
3304 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3305 const char *buf, size_t count)
3306 {
3307 struct con_driver *con = dev_get_drvdata(dev);
3308 int bind = simple_strtoul(buf, NULL, 0);
3309
3310 if (bind)
3311 vt_bind(con);
3312 else
3313 vt_unbind(con);
3314
3315 return count;
3316 }
3317
3318 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3319 char *buf)
3320 {
3321 struct con_driver *con = dev_get_drvdata(dev);
3322 int bind = con_is_bound(con->con);
3323
3324 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3325 }
3326
3327 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3328 char *buf)
3329 {
3330 struct con_driver *con = dev_get_drvdata(dev);
3331
3332 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3333 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3334 con->desc);
3335
3336 }
3337
3338 static struct device_attribute device_attrs[] = {
3339 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3340 __ATTR(name, S_IRUGO, show_name, NULL),
3341 };
3342
3343 static int vtconsole_init_device(struct con_driver *con)
3344 {
3345 int i;
3346 int error = 0;
3347
3348 con->flag |= CON_DRIVER_FLAG_ATTR;
3349 dev_set_drvdata(con->dev, con);
3350 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3351 error = device_create_file(con->dev, &device_attrs[i]);
3352 if (error)
3353 break;
3354 }
3355
3356 if (error) {
3357 while (--i >= 0)
3358 device_remove_file(con->dev, &device_attrs[i]);
3359 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3360 }
3361
3362 return error;
3363 }
3364
3365 static void vtconsole_deinit_device(struct con_driver *con)
3366 {
3367 int i;
3368
3369 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3370 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3371 device_remove_file(con->dev, &device_attrs[i]);
3372 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3373 }
3374 }
3375
3376 /**
3377 * con_is_bound - checks if driver is bound to the console
3378 * @csw: console driver
3379 *
3380 * RETURNS: zero if unbound, nonzero if bound
3381 *
3382 * Drivers can call this and if zero, they should release
3383 * all resources allocated on con_startup()
3384 */
3385 int con_is_bound(const struct consw *csw)
3386 {
3387 int i, bound = 0;
3388
3389 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3390 if (con_driver_map[i] == csw) {
3391 bound = 1;
3392 break;
3393 }
3394 }
3395
3396 return bound;
3397 }
3398 EXPORT_SYMBOL(con_is_bound);
3399
3400 /**
3401 * con_debug_enter - prepare the console for the kernel debugger
3402 * @sw: console driver
3403 *
3404 * Called when the console is taken over by the kernel debugger, this
3405 * function needs to save the current console state, then put the console
3406 * into a state suitable for the kernel debugger.
3407 *
3408 * RETURNS:
3409 * Zero on success, nonzero if a failure occurred when trying to prepare
3410 * the console for the debugger.
3411 */
3412 int con_debug_enter(struct vc_data *vc)
3413 {
3414 int ret = 0;
3415
3416 saved_fg_console = fg_console;
3417 saved_last_console = last_console;
3418 saved_want_console = want_console;
3419 saved_vc_mode = vc->vc_mode;
3420 saved_console_blanked = console_blanked;
3421 vc->vc_mode = KD_TEXT;
3422 console_blanked = 0;
3423 if (vc->vc_sw->con_debug_enter)
3424 ret = vc->vc_sw->con_debug_enter(vc);
3425 #ifdef CONFIG_KGDB_KDB
3426 /* Set the initial LINES variable if it is not already set */
3427 if (vc->vc_rows < 999) {
3428 int linecount;
3429 char lns[4];
3430 const char *setargs[3] = {
3431 "set",
3432 "LINES",
3433 lns,
3434 };
3435 if (kdbgetintenv(setargs[0], &linecount)) {
3436 snprintf(lns, 4, "%i", vc->vc_rows);
3437 kdb_set(2, setargs);
3438 }
3439 }
3440 if (vc->vc_cols < 999) {
3441 int colcount;
3442 char cols[4];
3443 const char *setargs[3] = {
3444 "set",
3445 "COLUMNS",
3446 cols,
3447 };
3448 if (kdbgetintenv(setargs[0], &colcount)) {
3449 snprintf(cols, 4, "%i", vc->vc_cols);
3450 kdb_set(2, setargs);
3451 }
3452 }
3453 #endif /* CONFIG_KGDB_KDB */
3454 return ret;
3455 }
3456 EXPORT_SYMBOL_GPL(con_debug_enter);
3457
3458 /**
3459 * con_debug_leave - restore console state
3460 * @sw: console driver
3461 *
3462 * Restore the console state to what it was before the kernel debugger
3463 * was invoked.
3464 *
3465 * RETURNS:
3466 * Zero on success, nonzero if a failure occurred when trying to restore
3467 * the console.
3468 */
3469 int con_debug_leave(void)
3470 {
3471 struct vc_data *vc;
3472 int ret = 0;
3473
3474 fg_console = saved_fg_console;
3475 last_console = saved_last_console;
3476 want_console = saved_want_console;
3477 console_blanked = saved_console_blanked;
3478 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3479
3480 vc = vc_cons[fg_console].d;
3481 if (vc->vc_sw->con_debug_leave)
3482 ret = vc->vc_sw->con_debug_leave(vc);
3483 return ret;
3484 }
3485 EXPORT_SYMBOL_GPL(con_debug_leave);
3486
3487 static int do_register_con_driver(const struct consw *csw, int first, int last)
3488 {
3489 struct module *owner = csw->owner;
3490 struct con_driver *con_driver;
3491 const char *desc;
3492 int i, retval = 0;
3493
3494 WARN_CONSOLE_UNLOCKED();
3495
3496 if (!try_module_get(owner))
3497 return -ENODEV;
3498
3499 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500 con_driver = &registered_con_driver[i];
3501
3502 /* already registered */
3503 if (con_driver->con == csw)
3504 retval = -EBUSY;
3505 }
3506
3507 if (retval)
3508 goto err;
3509
3510 desc = csw->con_startup();
3511
3512 if (!desc)
3513 goto err;
3514
3515 retval = -EINVAL;
3516
3517 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3518 con_driver = &registered_con_driver[i];
3519
3520 if (con_driver->con == NULL) {
3521 con_driver->con = csw;
3522 con_driver->desc = desc;
3523 con_driver->node = i;
3524 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3525 CON_DRIVER_FLAG_INIT;
3526 con_driver->first = first;
3527 con_driver->last = last;
3528 retval = 0;
3529 break;
3530 }
3531 }
3532
3533 if (retval)
3534 goto err;
3535
3536 con_driver->dev = device_create(vtconsole_class, NULL,
3537 MKDEV(0, con_driver->node),
3538 NULL, "vtcon%i",
3539 con_driver->node);
3540
3541 if (IS_ERR(con_driver->dev)) {
3542 printk(KERN_WARNING "Unable to create device for %s; "
3543 "errno = %ld\n", con_driver->desc,
3544 PTR_ERR(con_driver->dev));
3545 con_driver->dev = NULL;
3546 } else {
3547 vtconsole_init_device(con_driver);
3548 }
3549
3550 err:
3551 module_put(owner);
3552 return retval;
3553 }
3554
3555
3556 /**
3557 * do_unregister_con_driver - unregister console driver from console layer
3558 * @csw: console driver
3559 *
3560 * DESCRIPTION: All drivers that registers to the console layer must
3561 * call this function upon exit, or if the console driver is in a state
3562 * where it won't be able to handle console services, such as the
3563 * framebuffer console without loaded framebuffer drivers.
3564 *
3565 * The driver must unbind first prior to unregistration.
3566 */
3567 int do_unregister_con_driver(const struct consw *csw)
3568 {
3569 int i, retval = -ENODEV;
3570
3571 /* cannot unregister a bound driver */
3572 if (con_is_bound(csw))
3573 goto err;
3574
3575 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3576 struct con_driver *con_driver = &registered_con_driver[i];
3577
3578 if (con_driver->con == csw &&
3579 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3580 vtconsole_deinit_device(con_driver);
3581 device_destroy(vtconsole_class,
3582 MKDEV(0, con_driver->node));
3583 con_driver->con = NULL;
3584 con_driver->desc = NULL;
3585 con_driver->dev = NULL;
3586 con_driver->node = 0;
3587 con_driver->flag = 0;
3588 con_driver->first = 0;
3589 con_driver->last = 0;
3590 retval = 0;
3591 break;
3592 }
3593 }
3594 err:
3595 return retval;
3596 }
3597 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3598
3599 /*
3600 * If we support more console drivers, this function is used
3601 * when a driver wants to take over some existing consoles
3602 * and become default driver for newly opened ones.
3603 *
3604 * do_take_over_console is basically a register followed by unbind
3605 */
3606 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3607 {
3608 int err;
3609
3610 err = do_register_con_driver(csw, first, last);
3611 /*
3612 * If we get an busy error we still want to bind the console driver
3613 * and return success, as we may have unbound the console driver
3614 * but not unregistered it.
3615 */
3616 if (err == -EBUSY)
3617 err = 0;
3618 if (!err)
3619 do_bind_con_driver(csw, first, last, deflt);
3620
3621 return err;
3622 }
3623 EXPORT_SYMBOL_GPL(do_take_over_console);
3624
3625
3626 /*
3627 * give_up_console is a wrapper to unregister_con_driver. It will only
3628 * work if driver is fully unbound.
3629 */
3630 void give_up_console(const struct consw *csw)
3631 {
3632 console_lock();
3633 do_unregister_con_driver(csw);
3634 console_unlock();
3635 }
3636
3637 static int __init vtconsole_class_init(void)
3638 {
3639 int i;
3640
3641 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3642 if (IS_ERR(vtconsole_class)) {
3643 printk(KERN_WARNING "Unable to create vt console class; "
3644 "errno = %ld\n", PTR_ERR(vtconsole_class));
3645 vtconsole_class = NULL;
3646 }
3647
3648 /* Add system drivers to sysfs */
3649 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3650 struct con_driver *con = &registered_con_driver[i];
3651
3652 if (con->con && !con->dev) {
3653 con->dev = device_create(vtconsole_class, NULL,
3654 MKDEV(0, con->node),
3655 NULL, "vtcon%i",
3656 con->node);
3657
3658 if (IS_ERR(con->dev)) {
3659 printk(KERN_WARNING "Unable to create "
3660 "device for %s; errno = %ld\n",
3661 con->desc, PTR_ERR(con->dev));
3662 con->dev = NULL;
3663 } else {
3664 vtconsole_init_device(con);
3665 }
3666 }
3667 }
3668
3669 return 0;
3670 }
3671 postcore_initcall(vtconsole_class_init);
3672
3673 #endif
3674
3675 /*
3676 * Screen blanking
3677 */
3678
3679 static int set_vesa_blanking(char __user *p)
3680 {
3681 unsigned int mode;
3682
3683 if (get_user(mode, p + 1))
3684 return -EFAULT;
3685
3686 vesa_blank_mode = (mode < 4) ? mode : 0;
3687 return 0;
3688 }
3689
3690 void do_blank_screen(int entering_gfx)
3691 {
3692 struct vc_data *vc = vc_cons[fg_console].d;
3693 int i;
3694
3695 WARN_CONSOLE_UNLOCKED();
3696
3697 if (console_blanked) {
3698 if (blank_state == blank_vesa_wait) {
3699 blank_state = blank_off;
3700 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3701 }
3702 return;
3703 }
3704
3705 /* entering graphics mode? */
3706 if (entering_gfx) {
3707 hide_cursor(vc);
3708 save_screen(vc);
3709 vc->vc_sw->con_blank(vc, -1, 1);
3710 console_blanked = fg_console + 1;
3711 blank_state = blank_off;
3712 set_origin(vc);
3713 return;
3714 }
3715
3716 if (blank_state != blank_normal_wait)
3717 return;
3718 blank_state = blank_off;
3719
3720 /* don't blank graphics */
3721 if (vc->vc_mode != KD_TEXT) {
3722 console_blanked = fg_console + 1;
3723 return;
3724 }
3725
3726 hide_cursor(vc);
3727 del_timer_sync(&console_timer);
3728 blank_timer_expired = 0;
3729
3730 save_screen(vc);
3731 /* In case we need to reset origin, blanking hook returns 1 */
3732 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3733 console_blanked = fg_console + 1;
3734 if (i)
3735 set_origin(vc);
3736
3737 if (console_blank_hook && console_blank_hook(1))
3738 return;
3739
3740 if (vesa_off_interval && vesa_blank_mode) {
3741 blank_state = blank_vesa_wait;
3742 mod_timer(&console_timer, jiffies + vesa_off_interval);
3743 }
3744 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3745 }
3746 EXPORT_SYMBOL(do_blank_screen);
3747
3748 /*
3749 * Called by timer as well as from vt_console_driver
3750 */
3751 void do_unblank_screen(int leaving_gfx)
3752 {
3753 struct vc_data *vc;
3754
3755 /* This should now always be called from a "sane" (read: can schedule)
3756 * context for the sake of the low level drivers, except in the special
3757 * case of oops_in_progress
3758 */
3759 if (!oops_in_progress)
3760 might_sleep();
3761
3762 WARN_CONSOLE_UNLOCKED();
3763
3764 ignore_poke = 0;
3765 if (!console_blanked)
3766 return;
3767 if (!vc_cons_allocated(fg_console)) {
3768 /* impossible */
3769 pr_warning("unblank_screen: tty %d not allocated ??\n",
3770 fg_console+1);
3771 return;
3772 }
3773 vc = vc_cons[fg_console].d;
3774 /* Try to unblank in oops case too */
3775 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3776 return; /* but leave console_blanked != 0 */
3777
3778 if (blankinterval) {
3779 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3780 blank_state = blank_normal_wait;
3781 }
3782
3783 console_blanked = 0;
3784 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3785 /* Low-level driver cannot restore -> do it ourselves */
3786 update_screen(vc);
3787 if (console_blank_hook)
3788 console_blank_hook(0);
3789 set_palette(vc);
3790 set_cursor(vc);
3791 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3792 }
3793 EXPORT_SYMBOL(do_unblank_screen);
3794
3795 /*
3796 * This is called by the outside world to cause a forced unblank, mostly for
3797 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3798 * call it with 1 as an argument and so force a mode restore... that may kill
3799 * X or at least garbage the screen but would also make the Oops visible...
3800 */
3801 void unblank_screen(void)
3802 {
3803 do_unblank_screen(0);
3804 }
3805
3806 /*
3807 * We defer the timer blanking to work queue so it can take the console mutex
3808 * (console operations can still happen at irq time, but only from printk which
3809 * has the console mutex. Not perfect yet, but better than no locking
3810 */
3811 static void blank_screen_t(unsigned long dummy)
3812 {
3813 if (unlikely(!keventd_up())) {
3814 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3815 return;
3816 }
3817 blank_timer_expired = 1;
3818 schedule_work(&console_work);
3819 }
3820
3821 void poke_blanked_console(void)
3822 {
3823 WARN_CONSOLE_UNLOCKED();
3824
3825 /* Add this so we quickly catch whoever might call us in a non
3826 * safe context. Nowadays, unblank_screen() isn't to be called in
3827 * atomic contexts and is allowed to schedule (with the special case
3828 * of oops_in_progress, but that isn't of any concern for this
3829 * function. --BenH.
3830 */
3831 might_sleep();
3832
3833 /* This isn't perfectly race free, but a race here would be mostly harmless,
3834 * at worse, we'll do a spurrious blank and it's unlikely
3835 */
3836 del_timer(&console_timer);
3837 blank_timer_expired = 0;
3838
3839 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3840 return;
3841 if (console_blanked)
3842 unblank_screen();
3843 else if (blankinterval) {
3844 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3845 blank_state = blank_normal_wait;
3846 }
3847 }
3848
3849 /*
3850 * Palettes
3851 */
3852
3853 static void set_palette(struct vc_data *vc)
3854 {
3855 WARN_CONSOLE_UNLOCKED();
3856
3857 if (vc->vc_mode != KD_GRAPHICS)
3858 vc->vc_sw->con_set_palette(vc, color_table);
3859 }
3860
3861 /*
3862 * Load palette into the DAC registers. arg points to a colour
3863 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3864 */
3865
3866 int con_set_cmap(unsigned char __user *arg)
3867 {
3868 int i, j, k;
3869 unsigned char colormap[3*16];
3870
3871 if (copy_from_user(colormap, arg, sizeof(colormap)))
3872 return -EFAULT;
3873
3874 console_lock();
3875 for (i = k = 0; i < 16; i++) {
3876 default_red[i] = colormap[k++];
3877 default_grn[i] = colormap[k++];
3878 default_blu[i] = colormap[k++];
3879 }
3880 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3881 if (!vc_cons_allocated(i))
3882 continue;
3883 for (j = k = 0; j < 16; j++) {
3884 vc_cons[i].d->vc_palette[k++] = default_red[j];
3885 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3886 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3887 }
3888 set_palette(vc_cons[i].d);
3889 }
3890 console_unlock();
3891
3892 return 0;
3893 }
3894
3895 int con_get_cmap(unsigned char __user *arg)
3896 {
3897 int i, k;
3898 unsigned char colormap[3*16];
3899
3900 console_lock();
3901 for (i = k = 0; i < 16; i++) {
3902 colormap[k++] = default_red[i];
3903 colormap[k++] = default_grn[i];
3904 colormap[k++] = default_blu[i];
3905 }
3906 console_unlock();
3907
3908 if (copy_to_user(arg, colormap, sizeof(colormap)))
3909 return -EFAULT;
3910
3911 return 0;
3912 }
3913
3914 void reset_palette(struct vc_data *vc)
3915 {
3916 int j, k;
3917 for (j=k=0; j<16; j++) {
3918 vc->vc_palette[k++] = default_red[j];
3919 vc->vc_palette[k++] = default_grn[j];
3920 vc->vc_palette[k++] = default_blu[j];
3921 }
3922 set_palette(vc);
3923 }
3924
3925 /*
3926 * Font switching
3927 *
3928 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3929 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3930 * depending on width) reserved for each character which is kinda wasty, but
3931 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3932 * is up to the actual low-level console-driver convert data into its favorite
3933 * format (maybe we should add a `fontoffset' field to the `display'
3934 * structure so we won't have to convert the fontdata all the time.
3935 * /Jes
3936 */
3937
3938 #define max_font_size 65536
3939
3940 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3941 {
3942 struct console_font font;
3943 int rc = -EINVAL;
3944 int c;
3945
3946 if (op->data) {
3947 font.data = kmalloc(max_font_size, GFP_KERNEL);
3948 if (!font.data)
3949 return -ENOMEM;
3950 } else
3951 font.data = NULL;
3952
3953 console_lock();
3954 if (vc->vc_mode != KD_TEXT)
3955 rc = -EINVAL;
3956 else if (vc->vc_sw->con_font_get)
3957 rc = vc->vc_sw->con_font_get(vc, &font);
3958 else
3959 rc = -ENOSYS;
3960 console_unlock();
3961
3962 if (rc)
3963 goto out;
3964
3965 c = (font.width+7)/8 * 32 * font.charcount;
3966
3967 if (op->data && font.charcount > op->charcount)
3968 rc = -ENOSPC;
3969 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3970 if (font.width > op->width || font.height > op->height)
3971 rc = -ENOSPC;
3972 } else {
3973 if (font.width != 8)
3974 rc = -EIO;
3975 else if ((op->height && font.height > op->height) ||
3976 font.height > 32)
3977 rc = -ENOSPC;
3978 }
3979 if (rc)
3980 goto out;
3981
3982 op->height = font.height;
3983 op->width = font.width;
3984 op->charcount = font.charcount;
3985
3986 if (op->data && copy_to_user(op->data, font.data, c))
3987 rc = -EFAULT;
3988
3989 out:
3990 kfree(font.data);
3991 return rc;
3992 }
3993
3994 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3995 {
3996 struct console_font font;
3997 int rc = -EINVAL;
3998 int size;
3999
4000 if (vc->vc_mode != KD_TEXT)
4001 return -EINVAL;
4002 if (!op->data)
4003 return -EINVAL;
4004 if (op->charcount > 512)
4005 return -EINVAL;
4006 if (!op->height) { /* Need to guess font height [compat] */
4007 int h, i;
4008 u8 __user *charmap = op->data;
4009 u8 tmp;
4010
4011 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4012 so that we can get rid of this soon */
4013 if (!(op->flags & KD_FONT_FLAG_OLD))
4014 return -EINVAL;
4015 for (h = 32; h > 0; h--)
4016 for (i = 0; i < op->charcount; i++) {
4017 if (get_user(tmp, &charmap[32*i+h-1]))
4018 return -EFAULT;
4019 if (tmp)
4020 goto nonzero;
4021 }
4022 return -EINVAL;
4023 nonzero:
4024 op->height = h;
4025 }
4026 if (op->width <= 0 || op->width > 32 || op->height > 32)
4027 return -EINVAL;
4028 size = (op->width+7)/8 * 32 * op->charcount;
4029 if (size > max_font_size)
4030 return -ENOSPC;
4031 font.charcount = op->charcount;
4032 font.height = op->height;
4033 font.width = op->width;
4034 font.data = memdup_user(op->data, size);
4035 if (IS_ERR(font.data))
4036 return PTR_ERR(font.data);
4037 console_lock();
4038 if (vc->vc_mode != KD_TEXT)
4039 rc = -EINVAL;
4040 else if (vc->vc_sw->con_font_set)
4041 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4042 else
4043 rc = -ENOSYS;
4044 console_unlock();
4045 kfree(font.data);
4046 return rc;
4047 }
4048
4049 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4050 {
4051 struct console_font font = {.width = op->width, .height = op->height};
4052 char name[MAX_FONT_NAME];
4053 char *s = name;
4054 int rc;
4055
4056
4057 if (!op->data)
4058 s = NULL;
4059 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4060 return -EFAULT;
4061 else
4062 name[MAX_FONT_NAME - 1] = 0;
4063
4064 console_lock();
4065 if (vc->vc_mode != KD_TEXT) {
4066 console_unlock();
4067 return -EINVAL;
4068 }
4069 if (vc->vc_sw->con_font_default)
4070 rc = vc->vc_sw->con_font_default(vc, &font, s);
4071 else
4072 rc = -ENOSYS;
4073 console_unlock();
4074 if (!rc) {
4075 op->width = font.width;
4076 op->height = font.height;
4077 }
4078 return rc;
4079 }
4080
4081 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4082 {
4083 int con = op->height;
4084 int rc;
4085
4086
4087 console_lock();
4088 if (vc->vc_mode != KD_TEXT)
4089 rc = -EINVAL;
4090 else if (!vc->vc_sw->con_font_copy)
4091 rc = -ENOSYS;
4092 else if (con < 0 || !vc_cons_allocated(con))
4093 rc = -ENOTTY;
4094 else if (con == vc->vc_num) /* nothing to do */
4095 rc = 0;
4096 else
4097 rc = vc->vc_sw->con_font_copy(vc, con);
4098 console_unlock();
4099 return rc;
4100 }
4101
4102 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4103 {
4104 switch (op->op) {
4105 case KD_FONT_OP_SET:
4106 return con_font_set(vc, op);
4107 case KD_FONT_OP_GET:
4108 return con_font_get(vc, op);
4109 case KD_FONT_OP_SET_DEFAULT:
4110 return con_font_default(vc, op);
4111 case KD_FONT_OP_COPY:
4112 return con_font_copy(vc, op);
4113 }
4114 return -ENOSYS;
4115 }
4116
4117 /*
4118 * Interface exported to selection and vcs.
4119 */
4120
4121 /* used by selection */
4122 u16 screen_glyph(struct vc_data *vc, int offset)
4123 {
4124 u16 w = scr_readw(screenpos(vc, offset, 1));
4125 u16 c = w & 0xff;
4126
4127 if (w & vc->vc_hi_font_mask)
4128 c |= 0x100;
4129 return c;
4130 }
4131 EXPORT_SYMBOL_GPL(screen_glyph);
4132
4133 /* used by vcs - note the word offset */
4134 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4135 {
4136 return screenpos(vc, 2 * w_offset, viewed);
4137 }
4138
4139 void getconsxy(struct vc_data *vc, unsigned char *p)
4140 {
4141 p[0] = vc->vc_x;
4142 p[1] = vc->vc_y;
4143 }
4144
4145 void putconsxy(struct vc_data *vc, unsigned char *p)
4146 {
4147 hide_cursor(vc);
4148 gotoxy(vc, p[0], p[1]);
4149 set_cursor(vc);
4150 }
4151
4152 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4153 {
4154 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4155 return softcursor_original;
4156 return scr_readw(org);
4157 }
4158
4159 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4160 {
4161 scr_writew(val, org);
4162 if ((unsigned long)org == vc->vc_pos) {
4163 softcursor_original = -1;
4164 add_softcursor(vc);
4165 }
4166 }
4167
4168 void vcs_scr_updated(struct vc_data *vc)
4169 {
4170 notify_update(vc);
4171 }
4172
4173 /*
4174 * Visible symbols for modules
4175 */
4176
4177 EXPORT_SYMBOL(color_table);
4178 EXPORT_SYMBOL(default_red);
4179 EXPORT_SYMBOL(default_grn);
4180 EXPORT_SYMBOL(default_blu);
4181 EXPORT_SYMBOL(update_region);
4182 EXPORT_SYMBOL(redraw_screen);
4183 EXPORT_SYMBOL(vc_resize);
4184 EXPORT_SYMBOL(fg_console);
4185 EXPORT_SYMBOL(console_blank_hook);
4186 EXPORT_SYMBOL(console_blanked);
4187 EXPORT_SYMBOL(vc_cons);
4188 EXPORT_SYMBOL(global_cursor_default);
4189 #ifndef VT_SINGLE_DRIVER
4190 EXPORT_SYMBOL(give_up_console);
4191 #endif
Linux with added FPC-III support