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Merge tag 'microblaze-4.7-rc1' of git://git.monstr.eu/linux-2.6-microblaze
[deliverable/linux.git] / drivers / tty / vt / vt.c
1 /*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 */
4
5 /*
6 * Hopefully this will be a rather complete VT102 implementation.
7 *
8 * Beeping thanks to John T Kohl.
9 *
10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
11 * Chars, and VT100 enhancements by Peter MacDonald.
12 *
13 * Copy and paste function by Andrew Haylett,
14 * some enhancements by Alessandro Rubini.
15 *
16 * Code to check for different video-cards mostly by Galen Hunt,
17 * <g-hunt@ee.utah.edu>
18 *
19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
21 *
22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
23 * Resizing of consoles, aeb, 940926
24 *
25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
26 * <poe@daimi.aau.dk>
27 *
28 * User-defined bell sound, new setterm control sequences and printk
29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
30 *
31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
32 *
33 * Merge with the abstract console driver by Geert Uytterhoeven
34 * <geert@linux-m68k.org>, Jan 1997.
35 *
36 * Original m68k console driver modifications by
37 *
38 * - Arno Griffioen <arno@usn.nl>
39 * - David Carter <carter@cs.bris.ac.uk>
40 *
41 * The abstract console driver provides a generic interface for a text
42 * console. It supports VGA text mode, frame buffer based graphical consoles
43 * and special graphics processors that are only accessible through some
44 * registers (e.g. a TMS340x0 GSP).
45 *
46 * The interface to the hardware is specified using a special structure
47 * (struct consw) which contains function pointers to console operations
48 * (see <linux/console.h> for more information).
49 *
50 * Support for changeable cursor shape
51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
52 *
53 * Ported to i386 and con_scrolldelta fixed
54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
55 *
56 * Resurrected character buffers in videoram plus lots of other trickery
57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
58 *
59 * Removed old-style timers, introduced console_timer, made timer
60 * deletion SMP-safe. 17Jun00, Andrew Morton
61 *
62 * Removed console_lock, enabled interrupts across all console operations
63 * 13 March 2001, Andrew Morton
64 *
65 * Fixed UTF-8 mode so alternate charset modes always work according
66 * to control sequences interpreted in do_con_trol function
67 * preserving backward VT100 semigraphics compatibility,
68 * malformed UTF sequences represented as sequences of replacement glyphs,
69 * original codes or '?' as a last resort if replacement glyph is undefined
70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
71 */
72
73 #include <linux/module.h>
74 #include <linux/types.h>
75 #include <linux/sched.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/kernel.h>
79 #include <linux/string.h>
80 #include <linux/errno.h>
81 #include <linux/kd.h>
82 #include <linux/slab.h>
83 #include <linux/major.h>
84 #include <linux/mm.h>
85 #include <linux/console.h>
86 #include <linux/init.h>
87 #include <linux/mutex.h>
88 #include <linux/vt_kern.h>
89 #include <linux/selection.h>
90 #include <linux/tiocl.h>
91 #include <linux/kbd_kern.h>
92 #include <linux/consolemap.h>
93 #include <linux/timer.h>
94 #include <linux/interrupt.h>
95 #include <linux/workqueue.h>
96 #include <linux/pm.h>
97 #include <linux/font.h>
98 #include <linux/bitops.h>
99 #include <linux/notifier.h>
100 #include <linux/device.h>
101 #include <linux/io.h>
102 #include <linux/uaccess.h>
103 #include <linux/kdb.h>
104 #include <linux/ctype.h>
105
106 #define MAX_NR_CON_DRIVER 16
107
108 #define CON_DRIVER_FLAG_MODULE 1
109 #define CON_DRIVER_FLAG_INIT 2
110 #define CON_DRIVER_FLAG_ATTR 4
111 #define CON_DRIVER_FLAG_ZOMBIE 8
112
113 struct con_driver {
114 const struct consw *con;
115 const char *desc;
116 struct device *dev;
117 int node;
118 int first;
119 int last;
120 int flag;
121 };
122
123 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
124 const struct consw *conswitchp;
125
126 /* A bitmap for codes <32. A bit of 1 indicates that the code
127 * corresponding to that bit number invokes some special action
128 * (such as cursor movement) and should not be displayed as a
129 * glyph unless the disp_ctrl mode is explicitly enabled.
130 */
131 #define CTRL_ACTION 0x0d00ff81
132 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
133
134 /*
135 * Here is the default bell parameters: 750HZ, 1/8th of a second
136 */
137 #define DEFAULT_BELL_PITCH 750
138 #define DEFAULT_BELL_DURATION (HZ/8)
139 #define DEFAULT_CURSOR_BLINK_MS 200
140
141 struct vc vc_cons [MAX_NR_CONSOLES];
142
143 #ifndef VT_SINGLE_DRIVER
144 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
145 #endif
146
147 static int con_open(struct tty_struct *, struct file *);
148 static void vc_init(struct vc_data *vc, unsigned int rows,
149 unsigned int cols, int do_clear);
150 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
151 static void save_cur(struct vc_data *vc);
152 static void reset_terminal(struct vc_data *vc, int do_clear);
153 static void con_flush_chars(struct tty_struct *tty);
154 static int set_vesa_blanking(char __user *p);
155 static void set_cursor(struct vc_data *vc);
156 static void hide_cursor(struct vc_data *vc);
157 static void console_callback(struct work_struct *ignored);
158 static void con_driver_unregister_callback(struct work_struct *ignored);
159 static void blank_screen_t(unsigned long dummy);
160 static void set_palette(struct vc_data *vc);
161
162 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
163
164 static int printable; /* Is console ready for printing? */
165 int default_utf8 = true;
166 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
167 int global_cursor_default = -1;
168 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
169
170 static int cur_default = CUR_DEFAULT;
171 module_param(cur_default, int, S_IRUGO | S_IWUSR);
172
173 /*
174 * ignore_poke: don't unblank the screen when things are typed. This is
175 * mainly for the privacy of braille terminal users.
176 */
177 static int ignore_poke;
178
179 int do_poke_blanked_console;
180 int console_blanked;
181
182 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
183 static int vesa_off_interval;
184 static int blankinterval = 10*60;
185 core_param(consoleblank, blankinterval, int, 0444);
186
187 static DECLARE_WORK(console_work, console_callback);
188 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
189
190 /*
191 * fg_console is the current virtual console,
192 * last_console is the last used one,
193 * want_console is the console we want to switch to,
194 * saved_* variants are for save/restore around kernel debugger enter/leave
195 */
196 int fg_console;
197 int last_console;
198 int want_console = -1;
199 static int saved_fg_console;
200 static int saved_last_console;
201 static int saved_want_console;
202 static int saved_vc_mode;
203 static int saved_console_blanked;
204
205 /*
206 * For each existing display, we have a pointer to console currently visible
207 * on that display, allowing consoles other than fg_console to be refreshed
208 * appropriately. Unless the low-level driver supplies its own display_fg
209 * variable, we use this one for the "master display".
210 */
211 static struct vc_data *master_display_fg;
212
213 /*
214 * Unfortunately, we need to delay tty echo when we're currently writing to the
215 * console since the code is (and always was) not re-entrant, so we schedule
216 * all flip requests to process context with schedule-task() and run it from
217 * console_callback().
218 */
219
220 /*
221 * For the same reason, we defer scrollback to the console callback.
222 */
223 static int scrollback_delta;
224
225 /*
226 * Hook so that the power management routines can (un)blank
227 * the console on our behalf.
228 */
229 int (*console_blank_hook)(int);
230
231 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
232 static int blank_state;
233 static int blank_timer_expired;
234 enum {
235 blank_off = 0,
236 blank_normal_wait,
237 blank_vesa_wait,
238 };
239
240 /*
241 * /sys/class/tty/tty0/
242 *
243 * the attribute 'active' contains the name of the current vc
244 * console and it supports poll() to detect vc switches
245 */
246 static struct device *tty0dev;
247
248 /*
249 * Notifier list for console events.
250 */
251 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
252
253 int register_vt_notifier(struct notifier_block *nb)
254 {
255 return atomic_notifier_chain_register(&vt_notifier_list, nb);
256 }
257 EXPORT_SYMBOL_GPL(register_vt_notifier);
258
259 int unregister_vt_notifier(struct notifier_block *nb)
260 {
261 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
262 }
263 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
264
265 static void notify_write(struct vc_data *vc, unsigned int unicode)
266 {
267 struct vt_notifier_param param = { .vc = vc, .c = unicode };
268 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
269 }
270
271 static void notify_update(struct vc_data *vc)
272 {
273 struct vt_notifier_param param = { .vc = vc };
274 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
275 }
276 /*
277 * Low-Level Functions
278 */
279
280 #define IS_FG(vc) ((vc)->vc_num == fg_console)
281
282 #ifdef VT_BUF_VRAM_ONLY
283 #define DO_UPDATE(vc) 0
284 #else
285 #define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
286 #endif
287
288 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
289 {
290 unsigned short *p;
291
292 if (!viewed)
293 p = (unsigned short *)(vc->vc_origin + offset);
294 else if (!vc->vc_sw->con_screen_pos)
295 p = (unsigned short *)(vc->vc_visible_origin + offset);
296 else
297 p = vc->vc_sw->con_screen_pos(vc, offset);
298 return p;
299 }
300
301 /* Called from the keyboard irq path.. */
302 static inline void scrolldelta(int lines)
303 {
304 /* FIXME */
305 /* scrolldelta needs some kind of consistency lock, but the BKL was
306 and still is not protecting versus the scheduled back end */
307 scrollback_delta += lines;
308 schedule_console_callback();
309 }
310
311 void schedule_console_callback(void)
312 {
313 schedule_work(&console_work);
314 }
315
316 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
317 {
318 unsigned short *d, *s;
319
320 if (t+nr >= b)
321 nr = b - t - 1;
322 if (b > vc->vc_rows || t >= b || nr < 1)
323 return;
324 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
325 return;
326 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
327 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
328 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
329 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
330 vc->vc_size_row * nr);
331 }
332
333 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
334 {
335 unsigned short *s;
336 unsigned int step;
337
338 if (t+nr >= b)
339 nr = b - t - 1;
340 if (b > vc->vc_rows || t >= b || nr < 1)
341 return;
342 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
343 return;
344 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
345 step = vc->vc_cols * nr;
346 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
347 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
348 }
349
350 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
351 {
352 #ifndef VT_BUF_VRAM_ONLY
353 unsigned int xx, yy, offset;
354 u16 *p;
355
356 p = (u16 *) start;
357 if (!vc->vc_sw->con_getxy) {
358 offset = (start - vc->vc_origin) / 2;
359 xx = offset % vc->vc_cols;
360 yy = offset / vc->vc_cols;
361 } else {
362 int nxx, nyy;
363 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
364 xx = nxx; yy = nyy;
365 }
366 for(;;) {
367 u16 attrib = scr_readw(p) & 0xff00;
368 int startx = xx;
369 u16 *q = p;
370 while (xx < vc->vc_cols && count) {
371 if (attrib != (scr_readw(p) & 0xff00)) {
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 startx = xx;
375 q = p;
376 attrib = scr_readw(p) & 0xff00;
377 }
378 p++;
379 xx++;
380 count--;
381 }
382 if (p > q)
383 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
384 if (!count)
385 break;
386 xx = 0;
387 yy++;
388 if (vc->vc_sw->con_getxy) {
389 p = (u16 *)start;
390 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
391 }
392 }
393 #endif
394 }
395
396 void update_region(struct vc_data *vc, unsigned long start, int count)
397 {
398 WARN_CONSOLE_UNLOCKED();
399
400 if (DO_UPDATE(vc)) {
401 hide_cursor(vc);
402 do_update_region(vc, start, count);
403 set_cursor(vc);
404 }
405 }
406
407 /* Structure of attributes is hardware-dependent */
408
409 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
410 u8 _underline, u8 _reverse, u8 _italic)
411 {
412 if (vc->vc_sw->con_build_attr)
413 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
414 _blink, _underline, _reverse, _italic);
415
416 #ifndef VT_BUF_VRAM_ONLY
417 /*
418 * ++roman: I completely changed the attribute format for monochrome
419 * mode (!can_do_color). The formerly used MDA (monochrome display
420 * adapter) format didn't allow the combination of certain effects.
421 * Now the attribute is just a bit vector:
422 * Bit 0..1: intensity (0..2)
423 * Bit 2 : underline
424 * Bit 3 : reverse
425 * Bit 7 : blink
426 */
427 {
428 u8 a = _color;
429 if (!vc->vc_can_do_color)
430 return _intensity |
431 (_italic ? 2 : 0) |
432 (_underline ? 4 : 0) |
433 (_reverse ? 8 : 0) |
434 (_blink ? 0x80 : 0);
435 if (_italic)
436 a = (a & 0xF0) | vc->vc_itcolor;
437 else if (_underline)
438 a = (a & 0xf0) | vc->vc_ulcolor;
439 else if (_intensity == 0)
440 a = (a & 0xf0) | vc->vc_ulcolor;
441 if (_reverse)
442 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
443 if (_blink)
444 a ^= 0x80;
445 if (_intensity == 2)
446 a ^= 0x08;
447 if (vc->vc_hi_font_mask == 0x100)
448 a <<= 1;
449 return a;
450 }
451 #else
452 return 0;
453 #endif
454 }
455
456 static void update_attr(struct vc_data *vc)
457 {
458 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
459 vc->vc_blink, vc->vc_underline,
460 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
461 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
462 }
463
464 /* Note: inverting the screen twice should revert to the original state */
465 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
466 {
467 unsigned short *p;
468
469 WARN_CONSOLE_UNLOCKED();
470
471 count /= 2;
472 p = screenpos(vc, offset, viewed);
473 if (vc->vc_sw->con_invert_region)
474 vc->vc_sw->con_invert_region(vc, p, count);
475 #ifndef VT_BUF_VRAM_ONLY
476 else {
477 u16 *q = p;
478 int cnt = count;
479 u16 a;
480
481 if (!vc->vc_can_do_color) {
482 while (cnt--) {
483 a = scr_readw(q);
484 a ^= 0x0800;
485 scr_writew(a, q);
486 q++;
487 }
488 } else if (vc->vc_hi_font_mask == 0x100) {
489 while (cnt--) {
490 a = scr_readw(q);
491 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
492 scr_writew(a, q);
493 q++;
494 }
495 } else {
496 while (cnt--) {
497 a = scr_readw(q);
498 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
499 scr_writew(a, q);
500 q++;
501 }
502 }
503 }
504 #endif
505 if (DO_UPDATE(vc))
506 do_update_region(vc, (unsigned long) p, count);
507 notify_update(vc);
508 }
509
510 /* used by selection: complement pointer position */
511 void complement_pos(struct vc_data *vc, int offset)
512 {
513 static int old_offset = -1;
514 static unsigned short old;
515 static unsigned short oldx, oldy;
516
517 WARN_CONSOLE_UNLOCKED();
518
519 if (old_offset != -1 && old_offset >= 0 &&
520 old_offset < vc->vc_screenbuf_size) {
521 scr_writew(old, screenpos(vc, old_offset, 1));
522 if (DO_UPDATE(vc))
523 vc->vc_sw->con_putc(vc, old, oldy, oldx);
524 notify_update(vc);
525 }
526
527 old_offset = offset;
528
529 if (offset != -1 && offset >= 0 &&
530 offset < vc->vc_screenbuf_size) {
531 unsigned short new;
532 unsigned short *p;
533 p = screenpos(vc, offset, 1);
534 old = scr_readw(p);
535 new = old ^ vc->vc_complement_mask;
536 scr_writew(new, p);
537 if (DO_UPDATE(vc)) {
538 oldx = (offset >> 1) % vc->vc_cols;
539 oldy = (offset >> 1) / vc->vc_cols;
540 vc->vc_sw->con_putc(vc, new, oldy, oldx);
541 }
542 notify_update(vc);
543 }
544 }
545
546 static void insert_char(struct vc_data *vc, unsigned int nr)
547 {
548 unsigned short *p = (unsigned short *) vc->vc_pos;
549
550 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
551 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
552 vc->vc_need_wrap = 0;
553 if (DO_UPDATE(vc))
554 do_update_region(vc, (unsigned long) p,
555 vc->vc_cols - vc->vc_x);
556 }
557
558 static void delete_char(struct vc_data *vc, unsigned int nr)
559 {
560 unsigned short *p = (unsigned short *) vc->vc_pos;
561
562 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
563 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
564 nr * 2);
565 vc->vc_need_wrap = 0;
566 if (DO_UPDATE(vc))
567 do_update_region(vc, (unsigned long) p,
568 vc->vc_cols - vc->vc_x);
569 }
570
571 static int softcursor_original = -1;
572
573 static void add_softcursor(struct vc_data *vc)
574 {
575 int i = scr_readw((u16 *) vc->vc_pos);
576 u32 type = vc->vc_cursor_type;
577
578 if (! (type & 0x10)) return;
579 if (softcursor_original != -1) return;
580 softcursor_original = i;
581 i |= ((type >> 8) & 0xff00 );
582 i ^= ((type) & 0xff00 );
583 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
584 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
585 scr_writew(i, (u16 *) vc->vc_pos);
586 if (DO_UPDATE(vc))
587 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
588 }
589
590 static void hide_softcursor(struct vc_data *vc)
591 {
592 if (softcursor_original != -1) {
593 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
594 if (DO_UPDATE(vc))
595 vc->vc_sw->con_putc(vc, softcursor_original,
596 vc->vc_y, vc->vc_x);
597 softcursor_original = -1;
598 }
599 }
600
601 static void hide_cursor(struct vc_data *vc)
602 {
603 if (vc == sel_cons)
604 clear_selection();
605 vc->vc_sw->con_cursor(vc, CM_ERASE);
606 hide_softcursor(vc);
607 }
608
609 static void set_cursor(struct vc_data *vc)
610 {
611 if (!IS_FG(vc) || console_blanked ||
612 vc->vc_mode == KD_GRAPHICS)
613 return;
614 if (vc->vc_deccm) {
615 if (vc == sel_cons)
616 clear_selection();
617 add_softcursor(vc);
618 if ((vc->vc_cursor_type & 0x0f) != 1)
619 vc->vc_sw->con_cursor(vc, CM_DRAW);
620 } else
621 hide_cursor(vc);
622 }
623
624 static void set_origin(struct vc_data *vc)
625 {
626 WARN_CONSOLE_UNLOCKED();
627
628 if (!CON_IS_VISIBLE(vc) ||
629 !vc->vc_sw->con_set_origin ||
630 !vc->vc_sw->con_set_origin(vc))
631 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
632 vc->vc_visible_origin = vc->vc_origin;
633 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
634 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
635 }
636
637 static void save_screen(struct vc_data *vc)
638 {
639 WARN_CONSOLE_UNLOCKED();
640
641 if (vc->vc_sw->con_save_screen)
642 vc->vc_sw->con_save_screen(vc);
643 }
644
645 /*
646 * Redrawing of screen
647 */
648
649 void clear_buffer_attributes(struct vc_data *vc)
650 {
651 unsigned short *p = (unsigned short *)vc->vc_origin;
652 int count = vc->vc_screenbuf_size / 2;
653 int mask = vc->vc_hi_font_mask | 0xff;
654
655 for (; count > 0; count--, p++) {
656 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
657 }
658 }
659
660 void redraw_screen(struct vc_data *vc, int is_switch)
661 {
662 int redraw = 0;
663
664 WARN_CONSOLE_UNLOCKED();
665
666 if (!vc) {
667 /* strange ... */
668 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
669 return;
670 }
671
672 if (is_switch) {
673 struct vc_data *old_vc = vc_cons[fg_console].d;
674 if (old_vc == vc)
675 return;
676 if (!CON_IS_VISIBLE(vc))
677 redraw = 1;
678 *vc->vc_display_fg = vc;
679 fg_console = vc->vc_num;
680 hide_cursor(old_vc);
681 if (!CON_IS_VISIBLE(old_vc)) {
682 save_screen(old_vc);
683 set_origin(old_vc);
684 }
685 if (tty0dev)
686 sysfs_notify(&tty0dev->kobj, NULL, "active");
687 } else {
688 hide_cursor(vc);
689 redraw = 1;
690 }
691
692 if (redraw) {
693 int update;
694 int old_was_color = vc->vc_can_do_color;
695
696 set_origin(vc);
697 update = vc->vc_sw->con_switch(vc);
698 set_palette(vc);
699 /*
700 * If console changed from mono<->color, the best we can do
701 * is to clear the buffer attributes. As it currently stands,
702 * rebuilding new attributes from the old buffer is not doable
703 * without overly complex code.
704 */
705 if (old_was_color != vc->vc_can_do_color) {
706 update_attr(vc);
707 clear_buffer_attributes(vc);
708 }
709
710 /* Forcibly update if we're panicing */
711 if ((update && vc->vc_mode != KD_GRAPHICS) ||
712 vt_force_oops_output(vc))
713 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
714 }
715 set_cursor(vc);
716 if (is_switch) {
717 set_leds();
718 compute_shiftstate();
719 notify_update(vc);
720 }
721 }
722
723 /*
724 * Allocation, freeing and resizing of VTs.
725 */
726
727 int vc_cons_allocated(unsigned int i)
728 {
729 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
730 }
731
732 static void visual_init(struct vc_data *vc, int num, int init)
733 {
734 /* ++Geert: vc->vc_sw->con_init determines console size */
735 if (vc->vc_sw)
736 module_put(vc->vc_sw->owner);
737 vc->vc_sw = conswitchp;
738 #ifndef VT_SINGLE_DRIVER
739 if (con_driver_map[num])
740 vc->vc_sw = con_driver_map[num];
741 #endif
742 __module_get(vc->vc_sw->owner);
743 vc->vc_num = num;
744 vc->vc_display_fg = &master_display_fg;
745 if (vc->vc_uni_pagedir_loc)
746 con_free_unimap(vc);
747 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
748 vc->vc_uni_pagedir = NULL;
749 vc->vc_hi_font_mask = 0;
750 vc->vc_complement_mask = 0;
751 vc->vc_can_do_color = 0;
752 vc->vc_panic_force_write = false;
753 vc->vc_sw->con_init(vc, init);
754 if (!vc->vc_complement_mask)
755 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
756 vc->vc_s_complement_mask = vc->vc_complement_mask;
757 vc->vc_size_row = vc->vc_cols << 1;
758 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
759 }
760
761 int vc_allocate(unsigned int currcons) /* return 0 on success */
762 {
763 struct vt_notifier_param param;
764 struct vc_data *vc;
765
766 WARN_CONSOLE_UNLOCKED();
767
768 if (currcons >= MAX_NR_CONSOLES)
769 return -ENXIO;
770
771 if (vc_cons[currcons].d)
772 return 0;
773
774 /* due to the granularity of kmalloc, we waste some memory here */
775 /* the alloc is done in two steps, to optimize the common situation
776 of a 25x80 console (structsize=216, screenbuf_size=4000) */
777 /* although the numbers above are not valid since long ago, the
778 point is still up-to-date and the comment still has its value
779 even if only as a historical artifact. --mj, July 1998 */
780 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
781 if (!vc)
782 return -ENOMEM;
783
784 vc_cons[currcons].d = vc;
785 tty_port_init(&vc->port);
786 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
787
788 visual_init(vc, currcons, 1);
789
790 if (!*vc->vc_uni_pagedir_loc)
791 con_set_default_unimap(vc);
792
793 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
794 if (!vc->vc_screenbuf)
795 goto err_free;
796
797 /* If no drivers have overridden us and the user didn't pass a
798 boot option, default to displaying the cursor */
799 if (global_cursor_default == -1)
800 global_cursor_default = 1;
801
802 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
803 vcs_make_sysfs(currcons);
804 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
805
806 return 0;
807 err_free:
808 kfree(vc);
809 vc_cons[currcons].d = NULL;
810 return -ENOMEM;
811 }
812
813 static inline int resize_screen(struct vc_data *vc, int width, int height,
814 int user)
815 {
816 /* Resizes the resolution of the display adapater */
817 int err = 0;
818
819 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
820 err = vc->vc_sw->con_resize(vc, width, height, user);
821
822 return err;
823 }
824
825 /*
826 * Change # of rows and columns (0 means unchanged/the size of fg_console)
827 * [this is to be used together with some user program
828 * like resize that changes the hardware videomode]
829 */
830 #define VC_RESIZE_MAXCOL (32767)
831 #define VC_RESIZE_MAXROW (32767)
832
833 /**
834 * vc_do_resize - resizing method for the tty
835 * @tty: tty being resized
836 * @real_tty: real tty (different to tty if a pty/tty pair)
837 * @vc: virtual console private data
838 * @cols: columns
839 * @lines: lines
840 *
841 * Resize a virtual console, clipping according to the actual constraints.
842 * If the caller passes a tty structure then update the termios winsize
843 * information and perform any necessary signal handling.
844 *
845 * Caller must hold the console semaphore. Takes the termios rwsem and
846 * ctrl_lock of the tty IFF a tty is passed.
847 */
848
849 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
850 unsigned int cols, unsigned int lines)
851 {
852 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
853 unsigned long end;
854 unsigned int old_rows, old_row_size;
855 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
856 unsigned int user;
857 unsigned short *newscreen;
858
859 WARN_CONSOLE_UNLOCKED();
860
861 if (!vc)
862 return -ENXIO;
863
864 user = vc->vc_resize_user;
865 vc->vc_resize_user = 0;
866
867 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
868 return -EINVAL;
869
870 new_cols = (cols ? cols : vc->vc_cols);
871 new_rows = (lines ? lines : vc->vc_rows);
872 new_row_size = new_cols << 1;
873 new_screen_size = new_row_size * new_rows;
874
875 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
876 return 0;
877
878 newscreen = kmalloc(new_screen_size, GFP_USER);
879 if (!newscreen)
880 return -ENOMEM;
881
882 old_rows = vc->vc_rows;
883 old_row_size = vc->vc_size_row;
884
885 err = resize_screen(vc, new_cols, new_rows, user);
886 if (err) {
887 kfree(newscreen);
888 return err;
889 }
890
891 vc->vc_rows = new_rows;
892 vc->vc_cols = new_cols;
893 vc->vc_size_row = new_row_size;
894 vc->vc_screenbuf_size = new_screen_size;
895
896 rlth = min(old_row_size, new_row_size);
897 rrem = new_row_size - rlth;
898 old_origin = vc->vc_origin;
899 new_origin = (long) newscreen;
900 new_scr_end = new_origin + new_screen_size;
901
902 if (vc->vc_y > new_rows) {
903 if (old_rows - vc->vc_y < new_rows) {
904 /*
905 * Cursor near the bottom, copy contents from the
906 * bottom of buffer
907 */
908 old_origin += (old_rows - new_rows) * old_row_size;
909 } else {
910 /*
911 * Cursor is in no man's land, copy 1/2 screenful
912 * from the top and bottom of cursor position
913 */
914 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
915 }
916 }
917
918 end = old_origin + old_row_size * min(old_rows, new_rows);
919
920 update_attr(vc);
921
922 while (old_origin < end) {
923 scr_memcpyw((unsigned short *) new_origin,
924 (unsigned short *) old_origin, rlth);
925 if (rrem)
926 scr_memsetw((void *)(new_origin + rlth),
927 vc->vc_video_erase_char, rrem);
928 old_origin += old_row_size;
929 new_origin += new_row_size;
930 }
931 if (new_scr_end > new_origin)
932 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
933 new_scr_end - new_origin);
934 kfree(vc->vc_screenbuf);
935 vc->vc_screenbuf = newscreen;
936 vc->vc_screenbuf_size = new_screen_size;
937 set_origin(vc);
938
939 /* do part of a reset_terminal() */
940 vc->vc_top = 0;
941 vc->vc_bottom = vc->vc_rows;
942 gotoxy(vc, vc->vc_x, vc->vc_y);
943 save_cur(vc);
944
945 if (tty) {
946 /* Rewrite the requested winsize data with the actual
947 resulting sizes */
948 struct winsize ws;
949 memset(&ws, 0, sizeof(ws));
950 ws.ws_row = vc->vc_rows;
951 ws.ws_col = vc->vc_cols;
952 ws.ws_ypixel = vc->vc_scan_lines;
953 tty_do_resize(tty, &ws);
954 }
955
956 if (CON_IS_VISIBLE(vc))
957 update_screen(vc);
958 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
959 return err;
960 }
961
962 /**
963 * vc_resize - resize a VT
964 * @vc: virtual console
965 * @cols: columns
966 * @rows: rows
967 *
968 * Resize a virtual console as seen from the console end of things. We
969 * use the common vc_do_resize methods to update the structures. The
970 * caller must hold the console sem to protect console internals and
971 * vc->port.tty
972 */
973
974 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
975 {
976 return vc_do_resize(vc->port.tty, vc, cols, rows);
977 }
978
979 /**
980 * vt_resize - resize a VT
981 * @tty: tty to resize
982 * @ws: winsize attributes
983 *
984 * Resize a virtual terminal. This is called by the tty layer as we
985 * register our own handler for resizing. The mutual helper does all
986 * the actual work.
987 *
988 * Takes the console sem and the called methods then take the tty
989 * termios_rwsem and the tty ctrl_lock in that order.
990 */
991 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
992 {
993 struct vc_data *vc = tty->driver_data;
994 int ret;
995
996 console_lock();
997 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
998 console_unlock();
999 return ret;
1000 }
1001
1002 struct vc_data *vc_deallocate(unsigned int currcons)
1003 {
1004 struct vc_data *vc = NULL;
1005
1006 WARN_CONSOLE_UNLOCKED();
1007
1008 if (vc_cons_allocated(currcons)) {
1009 struct vt_notifier_param param;
1010
1011 param.vc = vc = vc_cons[currcons].d;
1012 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1013 vcs_remove_sysfs(currcons);
1014 vc->vc_sw->con_deinit(vc);
1015 put_pid(vc->vt_pid);
1016 module_put(vc->vc_sw->owner);
1017 kfree(vc->vc_screenbuf);
1018 vc_cons[currcons].d = NULL;
1019 }
1020 return vc;
1021 }
1022
1023 /*
1024 * VT102 emulator
1025 */
1026
1027 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1028 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1029 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1030
1031 #define decarm VC_REPEAT
1032 #define decckm VC_CKMODE
1033 #define kbdapplic VC_APPLIC
1034 #define lnm VC_CRLF
1035
1036 /*
1037 * this is what the terminal answers to a ESC-Z or csi0c query.
1038 */
1039 #define VT100ID "\033[?1;2c"
1040 #define VT102ID "\033[?6c"
1041
1042 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1043 8,12,10,14, 9,13,11,15 };
1044
1045 /* the default colour table, for VGA+ colour systems */
1046 unsigned char default_red[] = {
1047 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1048 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1049 };
1050 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1051
1052 unsigned char default_grn[] = {
1053 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1054 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1055 };
1056 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1057
1058 unsigned char default_blu[] = {
1059 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1060 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1061 };
1062 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1063
1064 /*
1065 * gotoxy() must verify all boundaries, because the arguments
1066 * might also be negative. If the given position is out of
1067 * bounds, the cursor is placed at the nearest margin.
1068 */
1069 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1070 {
1071 int min_y, max_y;
1072
1073 if (new_x < 0)
1074 vc->vc_x = 0;
1075 else {
1076 if (new_x >= vc->vc_cols)
1077 vc->vc_x = vc->vc_cols - 1;
1078 else
1079 vc->vc_x = new_x;
1080 }
1081
1082 if (vc->vc_decom) {
1083 min_y = vc->vc_top;
1084 max_y = vc->vc_bottom;
1085 } else {
1086 min_y = 0;
1087 max_y = vc->vc_rows;
1088 }
1089 if (new_y < min_y)
1090 vc->vc_y = min_y;
1091 else if (new_y >= max_y)
1092 vc->vc_y = max_y - 1;
1093 else
1094 vc->vc_y = new_y;
1095 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1096 vc->vc_need_wrap = 0;
1097 }
1098
1099 /* for absolute user moves, when decom is set */
1100 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1101 {
1102 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1103 }
1104
1105 void scrollback(struct vc_data *vc, int lines)
1106 {
1107 if (!lines)
1108 lines = vc->vc_rows / 2;
1109 scrolldelta(-lines);
1110 }
1111
1112 void scrollfront(struct vc_data *vc, int lines)
1113 {
1114 if (!lines)
1115 lines = vc->vc_rows / 2;
1116 scrolldelta(lines);
1117 }
1118
1119 static void lf(struct vc_data *vc)
1120 {
1121 /* don't scroll if above bottom of scrolling region, or
1122 * if below scrolling region
1123 */
1124 if (vc->vc_y + 1 == vc->vc_bottom)
1125 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1126 else if (vc->vc_y < vc->vc_rows - 1) {
1127 vc->vc_y++;
1128 vc->vc_pos += vc->vc_size_row;
1129 }
1130 vc->vc_need_wrap = 0;
1131 notify_write(vc, '\n');
1132 }
1133
1134 static void ri(struct vc_data *vc)
1135 {
1136 /* don't scroll if below top of scrolling region, or
1137 * if above scrolling region
1138 */
1139 if (vc->vc_y == vc->vc_top)
1140 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1141 else if (vc->vc_y > 0) {
1142 vc->vc_y--;
1143 vc->vc_pos -= vc->vc_size_row;
1144 }
1145 vc->vc_need_wrap = 0;
1146 }
1147
1148 static inline void cr(struct vc_data *vc)
1149 {
1150 vc->vc_pos -= vc->vc_x << 1;
1151 vc->vc_need_wrap = vc->vc_x = 0;
1152 notify_write(vc, '\r');
1153 }
1154
1155 static inline void bs(struct vc_data *vc)
1156 {
1157 if (vc->vc_x) {
1158 vc->vc_pos -= 2;
1159 vc->vc_x--;
1160 vc->vc_need_wrap = 0;
1161 notify_write(vc, '\b');
1162 }
1163 }
1164
1165 static inline void del(struct vc_data *vc)
1166 {
1167 /* ignored */
1168 }
1169
1170 static void csi_J(struct vc_data *vc, int vpar)
1171 {
1172 unsigned int count;
1173 unsigned short * start;
1174
1175 switch (vpar) {
1176 case 0: /* erase from cursor to end of display */
1177 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1178 start = (unsigned short *)vc->vc_pos;
1179 break;
1180 case 1: /* erase from start to cursor */
1181 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1182 start = (unsigned short *)vc->vc_origin;
1183 break;
1184 case 3: /* erase scroll-back buffer (and whole display) */
1185 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1186 vc->vc_screenbuf_size >> 1);
1187 set_origin(vc);
1188 if (CON_IS_VISIBLE(vc))
1189 update_screen(vc);
1190 /* fall through */
1191 case 2: /* erase whole display */
1192 count = vc->vc_cols * vc->vc_rows;
1193 start = (unsigned short *)vc->vc_origin;
1194 break;
1195 default:
1196 return;
1197 }
1198 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1199 if (DO_UPDATE(vc))
1200 do_update_region(vc, (unsigned long) start, count);
1201 vc->vc_need_wrap = 0;
1202 }
1203
1204 static void csi_K(struct vc_data *vc, int vpar)
1205 {
1206 unsigned int count;
1207 unsigned short * start;
1208
1209 switch (vpar) {
1210 case 0: /* erase from cursor to end of line */
1211 count = vc->vc_cols - vc->vc_x;
1212 start = (unsigned short *)vc->vc_pos;
1213 break;
1214 case 1: /* erase from start of line to cursor */
1215 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1216 count = vc->vc_x + 1;
1217 break;
1218 case 2: /* erase whole line */
1219 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1220 count = vc->vc_cols;
1221 break;
1222 default:
1223 return;
1224 }
1225 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1226 vc->vc_need_wrap = 0;
1227 if (DO_UPDATE(vc))
1228 do_update_region(vc, (unsigned long) start, count);
1229 }
1230
1231 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1232 { /* not vt100? */
1233 int count;
1234
1235 if (!vpar)
1236 vpar++;
1237 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1238
1239 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1240 if (DO_UPDATE(vc))
1241 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1242 vc->vc_need_wrap = 0;
1243 }
1244
1245 static void default_attr(struct vc_data *vc)
1246 {
1247 vc->vc_intensity = 1;
1248 vc->vc_italic = 0;
1249 vc->vc_underline = 0;
1250 vc->vc_reverse = 0;
1251 vc->vc_blink = 0;
1252 vc->vc_color = vc->vc_def_color;
1253 }
1254
1255 struct rgb { u8 r; u8 g; u8 b; };
1256
1257 static struct rgb rgb_from_256(int i)
1258 {
1259 struct rgb c;
1260 if (i < 8) { /* Standard colours. */
1261 c.r = i&1 ? 0xaa : 0x00;
1262 c.g = i&2 ? 0xaa : 0x00;
1263 c.b = i&4 ? 0xaa : 0x00;
1264 } else if (i < 16) {
1265 c.r = i&1 ? 0xff : 0x55;
1266 c.g = i&2 ? 0xff : 0x55;
1267 c.b = i&4 ? 0xff : 0x55;
1268 } else if (i < 232) { /* 6x6x6 colour cube. */
1269 c.r = (i - 16) / 36 * 85 / 2;
1270 c.g = (i - 16) / 6 % 6 * 85 / 2;
1271 c.b = (i - 16) % 6 * 85 / 2;
1272 } else /* Grayscale ramp. */
1273 c.r = c.g = c.b = i * 10 - 2312;
1274 return c;
1275 }
1276
1277 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1278 {
1279 u8 hue, max = c.r;
1280 if (c.g > max)
1281 max = c.g;
1282 if (c.b > max)
1283 max = c.b;
1284 hue = (c.r > max/2 ? 4 : 0)
1285 | (c.g > max/2 ? 2 : 0)
1286 | (c.b > max/2 ? 1 : 0);
1287 if (hue == 7 && max <= 0x55)
1288 hue = 0, vc->vc_intensity = 2;
1289 else
1290 vc->vc_intensity = (max > 0xaa) + 1;
1291 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1292 }
1293
1294 static void rgb_background(struct vc_data *vc, struct rgb c)
1295 {
1296 /* For backgrounds, err on the dark side. */
1297 vc->vc_color = (vc->vc_color & 0x0f)
1298 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1299 }
1300
1301 /* console_lock is held */
1302 static void csi_m(struct vc_data *vc)
1303 {
1304 int i;
1305
1306 for (i = 0; i <= vc->vc_npar; i++)
1307 switch (vc->vc_par[i]) {
1308 case 0: /* all attributes off */
1309 default_attr(vc);
1310 break;
1311 case 1:
1312 vc->vc_intensity = 2;
1313 break;
1314 case 2:
1315 vc->vc_intensity = 0;
1316 break;
1317 case 3:
1318 vc->vc_italic = 1;
1319 break;
1320 case 4:
1321 vc->vc_underline = 1;
1322 break;
1323 case 5:
1324 vc->vc_blink = 1;
1325 break;
1326 case 7:
1327 vc->vc_reverse = 1;
1328 break;
1329 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1330 * Select primary font, don't display
1331 * control chars if defined, don't set
1332 * bit 8 on output.
1333 */
1334 vc->vc_translate = set_translate(vc->vc_charset == 0
1335 ? vc->vc_G0_charset
1336 : vc->vc_G1_charset, vc);
1337 vc->vc_disp_ctrl = 0;
1338 vc->vc_toggle_meta = 0;
1339 break;
1340 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1341 * Select first alternate font, lets
1342 * chars < 32 be displayed as ROM chars.
1343 */
1344 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1345 vc->vc_disp_ctrl = 1;
1346 vc->vc_toggle_meta = 0;
1347 break;
1348 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1349 * Select second alternate font, toggle
1350 * high bit before displaying as ROM char.
1351 */
1352 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1353 vc->vc_disp_ctrl = 1;
1354 vc->vc_toggle_meta = 1;
1355 break;
1356 case 21:
1357 case 22:
1358 vc->vc_intensity = 1;
1359 break;
1360 case 23:
1361 vc->vc_italic = 0;
1362 break;
1363 case 24:
1364 vc->vc_underline = 0;
1365 break;
1366 case 25:
1367 vc->vc_blink = 0;
1368 break;
1369 case 27:
1370 vc->vc_reverse = 0;
1371 break;
1372 case 38: /* ITU T.416
1373 * Higher colour modes.
1374 * They break the usual properties of SGR codes
1375 * and thus need to be detected and ignored by
1376 * hand. Strictly speaking, that standard also
1377 * wants : rather than ; as separators, contrary
1378 * to ECMA-48, but no one produces such codes
1379 * and almost no one accepts them.
1380 */
1381 i++;
1382 if (i > vc->vc_npar)
1383 break;
1384 if (vc->vc_par[i] == 5 && /* 256 colours */
1385 i < vc->vc_npar) { /* ubiquitous */
1386 i++;
1387 rgb_foreground(vc,
1388 rgb_from_256(vc->vc_par[i]));
1389 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1390 i <= vc->vc_npar + 3) {/* extremely rare */
1391 struct rgb c = {
1392 .r = vc->vc_par[i + 1],
1393 .g = vc->vc_par[i + 2],
1394 .b = vc->vc_par[i + 3],
1395 };
1396 rgb_foreground(vc, c);
1397 i += 3;
1398 }
1399 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1400 * there's no point in supporting them.
1401 */
1402 break;
1403 case 48:
1404 i++;
1405 if (i > vc->vc_npar)
1406 break;
1407 if (vc->vc_par[i] == 5 && /* 256 colours */
1408 i < vc->vc_npar) {
1409 i++;
1410 rgb_background(vc,
1411 rgb_from_256(vc->vc_par[i]));
1412 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1413 i <= vc->vc_npar + 3) {
1414 struct rgb c = {
1415 .r = vc->vc_par[i + 1],
1416 .g = vc->vc_par[i + 2],
1417 .b = vc->vc_par[i + 3],
1418 };
1419 rgb_background(vc, c);
1420 i += 3;
1421 }
1422 break;
1423 case 39:
1424 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1425 break;
1426 case 49:
1427 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1428 break;
1429 default:
1430 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1431 vc->vc_color = color_table[vc->vc_par[i] - 30]
1432 | (vc->vc_color & 0xf0);
1433 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1434 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1435 | (vc->vc_color & 0x0f);
1436 break;
1437 }
1438 update_attr(vc);
1439 }
1440
1441 static void respond_string(const char *p, struct tty_port *port)
1442 {
1443 while (*p) {
1444 tty_insert_flip_char(port, *p, 0);
1445 p++;
1446 }
1447 tty_schedule_flip(port);
1448 }
1449
1450 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1451 {
1452 char buf[40];
1453
1454 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1455 respond_string(buf, tty->port);
1456 }
1457
1458 static inline void status_report(struct tty_struct *tty)
1459 {
1460 respond_string("\033[0n", tty->port); /* Terminal ok */
1461 }
1462
1463 static inline void respond_ID(struct tty_struct *tty)
1464 {
1465 respond_string(VT102ID, tty->port);
1466 }
1467
1468 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1469 {
1470 char buf[8];
1471
1472 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1473 (char)('!' + mry));
1474 respond_string(buf, tty->port);
1475 }
1476
1477 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1478 int mouse_reporting(void)
1479 {
1480 return vc_cons[fg_console].d->vc_report_mouse;
1481 }
1482
1483 /* console_lock is held */
1484 static void set_mode(struct vc_data *vc, int on_off)
1485 {
1486 int i;
1487
1488 for (i = 0; i <= vc->vc_npar; i++)
1489 if (vc->vc_ques) {
1490 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1491 case 1: /* Cursor keys send ^[Ox/^[[x */
1492 if (on_off)
1493 set_kbd(vc, decckm);
1494 else
1495 clr_kbd(vc, decckm);
1496 break;
1497 case 3: /* 80/132 mode switch unimplemented */
1498 vc->vc_deccolm = on_off;
1499 #if 0
1500 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1501 /* this alone does not suffice; some user mode
1502 utility has to change the hardware regs */
1503 #endif
1504 break;
1505 case 5: /* Inverted screen on/off */
1506 if (vc->vc_decscnm != on_off) {
1507 vc->vc_decscnm = on_off;
1508 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1509 update_attr(vc);
1510 }
1511 break;
1512 case 6: /* Origin relative/absolute */
1513 vc->vc_decom = on_off;
1514 gotoxay(vc, 0, 0);
1515 break;
1516 case 7: /* Autowrap on/off */
1517 vc->vc_decawm = on_off;
1518 break;
1519 case 8: /* Autorepeat on/off */
1520 if (on_off)
1521 set_kbd(vc, decarm);
1522 else
1523 clr_kbd(vc, decarm);
1524 break;
1525 case 9:
1526 vc->vc_report_mouse = on_off ? 1 : 0;
1527 break;
1528 case 25: /* Cursor on/off */
1529 vc->vc_deccm = on_off;
1530 break;
1531 case 1000:
1532 vc->vc_report_mouse = on_off ? 2 : 0;
1533 break;
1534 }
1535 } else {
1536 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1537 case 3: /* Monitor (display ctrls) */
1538 vc->vc_disp_ctrl = on_off;
1539 break;
1540 case 4: /* Insert Mode on/off */
1541 vc->vc_decim = on_off;
1542 break;
1543 case 20: /* Lf, Enter == CrLf/Lf */
1544 if (on_off)
1545 set_kbd(vc, lnm);
1546 else
1547 clr_kbd(vc, lnm);
1548 break;
1549 }
1550 }
1551 }
1552
1553 /* console_lock is held */
1554 static void setterm_command(struct vc_data *vc)
1555 {
1556 switch(vc->vc_par[0]) {
1557 case 1: /* set color for underline mode */
1558 if (vc->vc_can_do_color &&
1559 vc->vc_par[1] < 16) {
1560 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1561 if (vc->vc_underline)
1562 update_attr(vc);
1563 }
1564 break;
1565 case 2: /* set color for half intensity mode */
1566 if (vc->vc_can_do_color &&
1567 vc->vc_par[1] < 16) {
1568 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1569 if (vc->vc_intensity == 0)
1570 update_attr(vc);
1571 }
1572 break;
1573 case 8: /* store colors as defaults */
1574 vc->vc_def_color = vc->vc_attr;
1575 if (vc->vc_hi_font_mask == 0x100)
1576 vc->vc_def_color >>= 1;
1577 default_attr(vc);
1578 update_attr(vc);
1579 break;
1580 case 9: /* set blanking interval */
1581 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1582 poke_blanked_console();
1583 break;
1584 case 10: /* set bell frequency in Hz */
1585 if (vc->vc_npar >= 1)
1586 vc->vc_bell_pitch = vc->vc_par[1];
1587 else
1588 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1589 break;
1590 case 11: /* set bell duration in msec */
1591 if (vc->vc_npar >= 1)
1592 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1593 msecs_to_jiffies(vc->vc_par[1]) : 0;
1594 else
1595 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1596 break;
1597 case 12: /* bring specified console to the front */
1598 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1599 set_console(vc->vc_par[1] - 1);
1600 break;
1601 case 13: /* unblank the screen */
1602 poke_blanked_console();
1603 break;
1604 case 14: /* set vesa powerdown interval */
1605 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1606 break;
1607 case 15: /* activate the previous console */
1608 set_console(last_console);
1609 break;
1610 case 16: /* set cursor blink duration in msec */
1611 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1612 vc->vc_par[1] <= USHRT_MAX)
1613 vc->vc_cur_blink_ms = vc->vc_par[1];
1614 else
1615 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1616 break;
1617 }
1618 }
1619
1620 /* console_lock is held */
1621 static void csi_at(struct vc_data *vc, unsigned int nr)
1622 {
1623 if (nr > vc->vc_cols - vc->vc_x)
1624 nr = vc->vc_cols - vc->vc_x;
1625 else if (!nr)
1626 nr = 1;
1627 insert_char(vc, nr);
1628 }
1629
1630 /* console_lock is held */
1631 static void csi_L(struct vc_data *vc, unsigned int nr)
1632 {
1633 if (nr > vc->vc_rows - vc->vc_y)
1634 nr = vc->vc_rows - vc->vc_y;
1635 else if (!nr)
1636 nr = 1;
1637 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1638 vc->vc_need_wrap = 0;
1639 }
1640
1641 /* console_lock is held */
1642 static void csi_P(struct vc_data *vc, unsigned int nr)
1643 {
1644 if (nr > vc->vc_cols - vc->vc_x)
1645 nr = vc->vc_cols - vc->vc_x;
1646 else if (!nr)
1647 nr = 1;
1648 delete_char(vc, nr);
1649 }
1650
1651 /* console_lock is held */
1652 static void csi_M(struct vc_data *vc, unsigned int nr)
1653 {
1654 if (nr > vc->vc_rows - vc->vc_y)
1655 nr = vc->vc_rows - vc->vc_y;
1656 else if (!nr)
1657 nr=1;
1658 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1659 vc->vc_need_wrap = 0;
1660 }
1661
1662 /* console_lock is held (except via vc_init->reset_terminal */
1663 static void save_cur(struct vc_data *vc)
1664 {
1665 vc->vc_saved_x = vc->vc_x;
1666 vc->vc_saved_y = vc->vc_y;
1667 vc->vc_s_intensity = vc->vc_intensity;
1668 vc->vc_s_italic = vc->vc_italic;
1669 vc->vc_s_underline = vc->vc_underline;
1670 vc->vc_s_blink = vc->vc_blink;
1671 vc->vc_s_reverse = vc->vc_reverse;
1672 vc->vc_s_charset = vc->vc_charset;
1673 vc->vc_s_color = vc->vc_color;
1674 vc->vc_saved_G0 = vc->vc_G0_charset;
1675 vc->vc_saved_G1 = vc->vc_G1_charset;
1676 }
1677
1678 /* console_lock is held */
1679 static void restore_cur(struct vc_data *vc)
1680 {
1681 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1682 vc->vc_intensity = vc->vc_s_intensity;
1683 vc->vc_italic = vc->vc_s_italic;
1684 vc->vc_underline = vc->vc_s_underline;
1685 vc->vc_blink = vc->vc_s_blink;
1686 vc->vc_reverse = vc->vc_s_reverse;
1687 vc->vc_charset = vc->vc_s_charset;
1688 vc->vc_color = vc->vc_s_color;
1689 vc->vc_G0_charset = vc->vc_saved_G0;
1690 vc->vc_G1_charset = vc->vc_saved_G1;
1691 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1692 update_attr(vc);
1693 vc->vc_need_wrap = 0;
1694 }
1695
1696 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1697 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1698 ESpalette, ESosc };
1699
1700 /* console_lock is held (except via vc_init()) */
1701 static void reset_terminal(struct vc_data *vc, int do_clear)
1702 {
1703 vc->vc_top = 0;
1704 vc->vc_bottom = vc->vc_rows;
1705 vc->vc_state = ESnormal;
1706 vc->vc_ques = 0;
1707 vc->vc_translate = set_translate(LAT1_MAP, vc);
1708 vc->vc_G0_charset = LAT1_MAP;
1709 vc->vc_G1_charset = GRAF_MAP;
1710 vc->vc_charset = 0;
1711 vc->vc_need_wrap = 0;
1712 vc->vc_report_mouse = 0;
1713 vc->vc_utf = default_utf8;
1714 vc->vc_utf_count = 0;
1715
1716 vc->vc_disp_ctrl = 0;
1717 vc->vc_toggle_meta = 0;
1718
1719 vc->vc_decscnm = 0;
1720 vc->vc_decom = 0;
1721 vc->vc_decawm = 1;
1722 vc->vc_deccm = global_cursor_default;
1723 vc->vc_decim = 0;
1724
1725 vt_reset_keyboard(vc->vc_num);
1726
1727 vc->vc_cursor_type = cur_default;
1728 vc->vc_complement_mask = vc->vc_s_complement_mask;
1729
1730 default_attr(vc);
1731 update_attr(vc);
1732
1733 vc->vc_tab_stop[0] = 0x01010100;
1734 vc->vc_tab_stop[1] =
1735 vc->vc_tab_stop[2] =
1736 vc->vc_tab_stop[3] =
1737 vc->vc_tab_stop[4] =
1738 vc->vc_tab_stop[5] =
1739 vc->vc_tab_stop[6] =
1740 vc->vc_tab_stop[7] = 0x01010101;
1741
1742 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1743 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1744 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1745
1746 gotoxy(vc, 0, 0);
1747 save_cur(vc);
1748 if (do_clear)
1749 csi_J(vc, 2);
1750 }
1751
1752 /* console_lock is held */
1753 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1754 {
1755 /*
1756 * Control characters can be used in the _middle_
1757 * of an escape sequence.
1758 */
1759 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1760 return;
1761 switch (c) {
1762 case 0:
1763 return;
1764 case 7:
1765 if (vc->vc_state == ESosc)
1766 vc->vc_state = ESnormal;
1767 else if (vc->vc_bell_duration)
1768 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1769 return;
1770 case 8:
1771 bs(vc);
1772 return;
1773 case 9:
1774 vc->vc_pos -= (vc->vc_x << 1);
1775 while (vc->vc_x < vc->vc_cols - 1) {
1776 vc->vc_x++;
1777 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1778 break;
1779 }
1780 vc->vc_pos += (vc->vc_x << 1);
1781 notify_write(vc, '\t');
1782 return;
1783 case 10: case 11: case 12:
1784 lf(vc);
1785 if (!is_kbd(vc, lnm))
1786 return;
1787 case 13:
1788 cr(vc);
1789 return;
1790 case 14:
1791 vc->vc_charset = 1;
1792 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1793 vc->vc_disp_ctrl = 1;
1794 return;
1795 case 15:
1796 vc->vc_charset = 0;
1797 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1798 vc->vc_disp_ctrl = 0;
1799 return;
1800 case 24: case 26:
1801 vc->vc_state = ESnormal;
1802 return;
1803 case 27:
1804 vc->vc_state = ESesc;
1805 return;
1806 case 127:
1807 del(vc);
1808 return;
1809 case 128+27:
1810 vc->vc_state = ESsquare;
1811 return;
1812 }
1813 switch(vc->vc_state) {
1814 case ESesc:
1815 vc->vc_state = ESnormal;
1816 switch (c) {
1817 case '[':
1818 vc->vc_state = ESsquare;
1819 return;
1820 case ']':
1821 vc->vc_state = ESnonstd;
1822 return;
1823 case '%':
1824 vc->vc_state = ESpercent;
1825 return;
1826 case 'E':
1827 cr(vc);
1828 lf(vc);
1829 return;
1830 case 'M':
1831 ri(vc);
1832 return;
1833 case 'D':
1834 lf(vc);
1835 return;
1836 case 'H':
1837 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1838 return;
1839 case 'Z':
1840 respond_ID(tty);
1841 return;
1842 case '7':
1843 save_cur(vc);
1844 return;
1845 case '8':
1846 restore_cur(vc);
1847 return;
1848 case '(':
1849 vc->vc_state = ESsetG0;
1850 return;
1851 case ')':
1852 vc->vc_state = ESsetG1;
1853 return;
1854 case '#':
1855 vc->vc_state = EShash;
1856 return;
1857 case 'c':
1858 reset_terminal(vc, 1);
1859 return;
1860 case '>': /* Numeric keypad */
1861 clr_kbd(vc, kbdapplic);
1862 return;
1863 case '=': /* Appl. keypad */
1864 set_kbd(vc, kbdapplic);
1865 return;
1866 }
1867 return;
1868 case ESnonstd:
1869 if (c=='P') { /* palette escape sequence */
1870 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1871 vc->vc_par[vc->vc_npar] = 0;
1872 vc->vc_npar = 0;
1873 vc->vc_state = ESpalette;
1874 return;
1875 } else if (c=='R') { /* reset palette */
1876 reset_palette(vc);
1877 vc->vc_state = ESnormal;
1878 } else if (c>='0' && c<='9')
1879 vc->vc_state = ESosc;
1880 else
1881 vc->vc_state = ESnormal;
1882 return;
1883 case ESpalette:
1884 if (isxdigit(c)) {
1885 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1886 if (vc->vc_npar == 7) {
1887 int i = vc->vc_par[0] * 3, j = 1;
1888 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1889 vc->vc_palette[i++] += vc->vc_par[j++];
1890 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1891 vc->vc_palette[i++] += vc->vc_par[j++];
1892 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1893 vc->vc_palette[i] += vc->vc_par[j];
1894 set_palette(vc);
1895 vc->vc_state = ESnormal;
1896 }
1897 } else
1898 vc->vc_state = ESnormal;
1899 return;
1900 case ESsquare:
1901 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1902 vc->vc_par[vc->vc_npar] = 0;
1903 vc->vc_npar = 0;
1904 vc->vc_state = ESgetpars;
1905 if (c == '[') { /* Function key */
1906 vc->vc_state=ESfunckey;
1907 return;
1908 }
1909 vc->vc_ques = (c == '?');
1910 if (vc->vc_ques)
1911 return;
1912 case ESgetpars:
1913 if (c == ';' && vc->vc_npar < NPAR - 1) {
1914 vc->vc_npar++;
1915 return;
1916 } else if (c>='0' && c<='9') {
1917 vc->vc_par[vc->vc_npar] *= 10;
1918 vc->vc_par[vc->vc_npar] += c - '0';
1919 return;
1920 }
1921 vc->vc_state = ESnormal;
1922 switch(c) {
1923 case 'h':
1924 set_mode(vc, 1);
1925 return;
1926 case 'l':
1927 set_mode(vc, 0);
1928 return;
1929 case 'c':
1930 if (vc->vc_ques) {
1931 if (vc->vc_par[0])
1932 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1933 else
1934 vc->vc_cursor_type = cur_default;
1935 return;
1936 }
1937 break;
1938 case 'm':
1939 if (vc->vc_ques) {
1940 clear_selection();
1941 if (vc->vc_par[0])
1942 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1943 else
1944 vc->vc_complement_mask = vc->vc_s_complement_mask;
1945 return;
1946 }
1947 break;
1948 case 'n':
1949 if (!vc->vc_ques) {
1950 if (vc->vc_par[0] == 5)
1951 status_report(tty);
1952 else if (vc->vc_par[0] == 6)
1953 cursor_report(vc, tty);
1954 }
1955 return;
1956 }
1957 if (vc->vc_ques) {
1958 vc->vc_ques = 0;
1959 return;
1960 }
1961 switch(c) {
1962 case 'G': case '`':
1963 if (vc->vc_par[0])
1964 vc->vc_par[0]--;
1965 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1966 return;
1967 case 'A':
1968 if (!vc->vc_par[0])
1969 vc->vc_par[0]++;
1970 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1971 return;
1972 case 'B': case 'e':
1973 if (!vc->vc_par[0])
1974 vc->vc_par[0]++;
1975 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1976 return;
1977 case 'C': case 'a':
1978 if (!vc->vc_par[0])
1979 vc->vc_par[0]++;
1980 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1981 return;
1982 case 'D':
1983 if (!vc->vc_par[0])
1984 vc->vc_par[0]++;
1985 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1986 return;
1987 case 'E':
1988 if (!vc->vc_par[0])
1989 vc->vc_par[0]++;
1990 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1991 return;
1992 case 'F':
1993 if (!vc->vc_par[0])
1994 vc->vc_par[0]++;
1995 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1996 return;
1997 case 'd':
1998 if (vc->vc_par[0])
1999 vc->vc_par[0]--;
2000 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2001 return;
2002 case 'H': case 'f':
2003 if (vc->vc_par[0])
2004 vc->vc_par[0]--;
2005 if (vc->vc_par[1])
2006 vc->vc_par[1]--;
2007 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2008 return;
2009 case 'J':
2010 csi_J(vc, vc->vc_par[0]);
2011 return;
2012 case 'K':
2013 csi_K(vc, vc->vc_par[0]);
2014 return;
2015 case 'L':
2016 csi_L(vc, vc->vc_par[0]);
2017 return;
2018 case 'M':
2019 csi_M(vc, vc->vc_par[0]);
2020 return;
2021 case 'P':
2022 csi_P(vc, vc->vc_par[0]);
2023 return;
2024 case 'c':
2025 if (!vc->vc_par[0])
2026 respond_ID(tty);
2027 return;
2028 case 'g':
2029 if (!vc->vc_par[0])
2030 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2031 else if (vc->vc_par[0] == 3) {
2032 vc->vc_tab_stop[0] =
2033 vc->vc_tab_stop[1] =
2034 vc->vc_tab_stop[2] =
2035 vc->vc_tab_stop[3] =
2036 vc->vc_tab_stop[4] =
2037 vc->vc_tab_stop[5] =
2038 vc->vc_tab_stop[6] =
2039 vc->vc_tab_stop[7] = 0;
2040 }
2041 return;
2042 case 'm':
2043 csi_m(vc);
2044 return;
2045 case 'q': /* DECLL - but only 3 leds */
2046 /* map 0,1,2,3 to 0,1,2,4 */
2047 if (vc->vc_par[0] < 4)
2048 vt_set_led_state(vc->vc_num,
2049 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2050 return;
2051 case 'r':
2052 if (!vc->vc_par[0])
2053 vc->vc_par[0]++;
2054 if (!vc->vc_par[1])
2055 vc->vc_par[1] = vc->vc_rows;
2056 /* Minimum allowed region is 2 lines */
2057 if (vc->vc_par[0] < vc->vc_par[1] &&
2058 vc->vc_par[1] <= vc->vc_rows) {
2059 vc->vc_top = vc->vc_par[0] - 1;
2060 vc->vc_bottom = vc->vc_par[1];
2061 gotoxay(vc, 0, 0);
2062 }
2063 return;
2064 case 's':
2065 save_cur(vc);
2066 return;
2067 case 'u':
2068 restore_cur(vc);
2069 return;
2070 case 'X':
2071 csi_X(vc, vc->vc_par[0]);
2072 return;
2073 case '@':
2074 csi_at(vc, vc->vc_par[0]);
2075 return;
2076 case ']': /* setterm functions */
2077 setterm_command(vc);
2078 return;
2079 }
2080 return;
2081 case ESpercent:
2082 vc->vc_state = ESnormal;
2083 switch (c) {
2084 case '@': /* defined in ISO 2022 */
2085 vc->vc_utf = 0;
2086 return;
2087 case 'G': /* prelim official escape code */
2088 case '8': /* retained for compatibility */
2089 vc->vc_utf = 1;
2090 return;
2091 }
2092 return;
2093 case ESfunckey:
2094 vc->vc_state = ESnormal;
2095 return;
2096 case EShash:
2097 vc->vc_state = ESnormal;
2098 if (c == '8') {
2099 /* DEC screen alignment test. kludge :-) */
2100 vc->vc_video_erase_char =
2101 (vc->vc_video_erase_char & 0xff00) | 'E';
2102 csi_J(vc, 2);
2103 vc->vc_video_erase_char =
2104 (vc->vc_video_erase_char & 0xff00) | ' ';
2105 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2106 }
2107 return;
2108 case ESsetG0:
2109 if (c == '0')
2110 vc->vc_G0_charset = GRAF_MAP;
2111 else if (c == 'B')
2112 vc->vc_G0_charset = LAT1_MAP;
2113 else if (c == 'U')
2114 vc->vc_G0_charset = IBMPC_MAP;
2115 else if (c == 'K')
2116 vc->vc_G0_charset = USER_MAP;
2117 if (vc->vc_charset == 0)
2118 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2119 vc->vc_state = ESnormal;
2120 return;
2121 case ESsetG1:
2122 if (c == '0')
2123 vc->vc_G1_charset = GRAF_MAP;
2124 else if (c == 'B')
2125 vc->vc_G1_charset = LAT1_MAP;
2126 else if (c == 'U')
2127 vc->vc_G1_charset = IBMPC_MAP;
2128 else if (c == 'K')
2129 vc->vc_G1_charset = USER_MAP;
2130 if (vc->vc_charset == 1)
2131 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2132 vc->vc_state = ESnormal;
2133 return;
2134 case ESosc:
2135 return;
2136 default:
2137 vc->vc_state = ESnormal;
2138 }
2139 }
2140
2141 /* is_double_width() is based on the wcwidth() implementation by
2142 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2143 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2144 */
2145 struct interval {
2146 uint32_t first;
2147 uint32_t last;
2148 };
2149
2150 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2151 {
2152 int min = 0;
2153 int mid;
2154
2155 if (ucs < table[0].first || ucs > table[max].last)
2156 return 0;
2157 while (max >= min) {
2158 mid = (min + max) / 2;
2159 if (ucs > table[mid].last)
2160 min = mid + 1;
2161 else if (ucs < table[mid].first)
2162 max = mid - 1;
2163 else
2164 return 1;
2165 }
2166 return 0;
2167 }
2168
2169 static int is_double_width(uint32_t ucs)
2170 {
2171 static const struct interval double_width[] = {
2172 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2173 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2174 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2175 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2176 };
2177 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2178 }
2179
2180 /* acquires console_lock */
2181 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2182 {
2183 #ifdef VT_BUF_VRAM_ONLY
2184 #define FLUSH do { } while(0);
2185 #else
2186 #define FLUSH if (draw_x >= 0) { \
2187 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2188 draw_x = -1; \
2189 }
2190 #endif
2191
2192 int c, tc, ok, n = 0, draw_x = -1;
2193 unsigned int currcons;
2194 unsigned long draw_from = 0, draw_to = 0;
2195 struct vc_data *vc;
2196 unsigned char vc_attr;
2197 struct vt_notifier_param param;
2198 uint8_t rescan;
2199 uint8_t inverse;
2200 uint8_t width;
2201 u16 himask, charmask;
2202
2203 if (in_interrupt())
2204 return count;
2205
2206 might_sleep();
2207
2208 console_lock();
2209 vc = tty->driver_data;
2210 if (vc == NULL) {
2211 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2212 console_unlock();
2213 return 0;
2214 }
2215
2216 currcons = vc->vc_num;
2217 if (!vc_cons_allocated(currcons)) {
2218 /* could this happen? */
2219 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2220 console_unlock();
2221 return 0;
2222 }
2223
2224 himask = vc->vc_hi_font_mask;
2225 charmask = himask ? 0x1ff : 0xff;
2226
2227 /* undraw cursor first */
2228 if (IS_FG(vc))
2229 hide_cursor(vc);
2230
2231 param.vc = vc;
2232
2233 while (!tty->stopped && count) {
2234 int orig = *buf;
2235 c = orig;
2236 buf++;
2237 n++;
2238 count--;
2239 rescan = 0;
2240 inverse = 0;
2241 width = 1;
2242
2243 /* Do no translation at all in control states */
2244 if (vc->vc_state != ESnormal) {
2245 tc = c;
2246 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2247 /* Combine UTF-8 into Unicode in vc_utf_char.
2248 * vc_utf_count is the number of continuation bytes still
2249 * expected to arrive.
2250 * vc_npar is the number of continuation bytes arrived so
2251 * far
2252 */
2253 rescan_last_byte:
2254 if ((c & 0xc0) == 0x80) {
2255 /* Continuation byte received */
2256 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2257 if (vc->vc_utf_count) {
2258 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2259 vc->vc_npar++;
2260 if (--vc->vc_utf_count) {
2261 /* Still need some bytes */
2262 continue;
2263 }
2264 /* Got a whole character */
2265 c = vc->vc_utf_char;
2266 /* Reject overlong sequences */
2267 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2268 c > utf8_length_changes[vc->vc_npar])
2269 c = 0xfffd;
2270 } else {
2271 /* Unexpected continuation byte */
2272 vc->vc_utf_count = 0;
2273 c = 0xfffd;
2274 }
2275 } else {
2276 /* Single ASCII byte or first byte of a sequence received */
2277 if (vc->vc_utf_count) {
2278 /* Continuation byte expected */
2279 rescan = 1;
2280 vc->vc_utf_count = 0;
2281 c = 0xfffd;
2282 } else if (c > 0x7f) {
2283 /* First byte of a multibyte sequence received */
2284 vc->vc_npar = 0;
2285 if ((c & 0xe0) == 0xc0) {
2286 vc->vc_utf_count = 1;
2287 vc->vc_utf_char = (c & 0x1f);
2288 } else if ((c & 0xf0) == 0xe0) {
2289 vc->vc_utf_count = 2;
2290 vc->vc_utf_char = (c & 0x0f);
2291 } else if ((c & 0xf8) == 0xf0) {
2292 vc->vc_utf_count = 3;
2293 vc->vc_utf_char = (c & 0x07);
2294 } else if ((c & 0xfc) == 0xf8) {
2295 vc->vc_utf_count = 4;
2296 vc->vc_utf_char = (c & 0x03);
2297 } else if ((c & 0xfe) == 0xfc) {
2298 vc->vc_utf_count = 5;
2299 vc->vc_utf_char = (c & 0x01);
2300 } else {
2301 /* 254 and 255 are invalid */
2302 c = 0xfffd;
2303 }
2304 if (vc->vc_utf_count) {
2305 /* Still need some bytes */
2306 continue;
2307 }
2308 }
2309 /* Nothing to do if an ASCII byte was received */
2310 }
2311 /* End of UTF-8 decoding. */
2312 /* c is the received character, or U+FFFD for invalid sequences. */
2313 /* Replace invalid Unicode code points with U+FFFD too */
2314 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2315 c = 0xfffd;
2316 tc = c;
2317 } else { /* no utf or alternate charset mode */
2318 tc = vc_translate(vc, c);
2319 }
2320
2321 param.c = tc;
2322 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2323 &param) == NOTIFY_STOP)
2324 continue;
2325
2326 /* If the original code was a control character we
2327 * only allow a glyph to be displayed if the code is
2328 * not normally used (such as for cursor movement) or
2329 * if the disp_ctrl mode has been explicitly enabled.
2330 * Certain characters (as given by the CTRL_ALWAYS
2331 * bitmap) are always displayed as control characters,
2332 * as the console would be pretty useless without
2333 * them; to display an arbitrary font position use the
2334 * direct-to-font zone in UTF-8 mode.
2335 */
2336 ok = tc && (c >= 32 ||
2337 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2338 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2339 && (c != 127 || vc->vc_disp_ctrl)
2340 && (c != 128+27);
2341
2342 if (vc->vc_state == ESnormal && ok) {
2343 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2344 if (is_double_width(c))
2345 width = 2;
2346 }
2347 /* Now try to find out how to display it */
2348 tc = conv_uni_to_pc(vc, tc);
2349 if (tc & ~charmask) {
2350 if (tc == -1 || tc == -2) {
2351 continue; /* nothing to display */
2352 }
2353 /* Glyph not found */
2354 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2355 /* In legacy mode use the glyph we get by a 1:1 mapping.
2356 This would make absolutely no sense with Unicode in mind,
2357 but do this for ASCII characters since a font may lack
2358 Unicode mapping info and we don't want to end up with
2359 having question marks only. */
2360 tc = c;
2361 } else {
2362 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2363 tc = conv_uni_to_pc(vc, 0xfffd);
2364 if (tc < 0) {
2365 inverse = 1;
2366 tc = conv_uni_to_pc(vc, '?');
2367 if (tc < 0) tc = '?';
2368 }
2369 }
2370 }
2371
2372 if (!inverse) {
2373 vc_attr = vc->vc_attr;
2374 } else {
2375 /* invert vc_attr */
2376 if (!vc->vc_can_do_color) {
2377 vc_attr = (vc->vc_attr) ^ 0x08;
2378 } else if (vc->vc_hi_font_mask == 0x100) {
2379 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2380 } else {
2381 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2382 }
2383 FLUSH
2384 }
2385
2386 while (1) {
2387 if (vc->vc_need_wrap || vc->vc_decim)
2388 FLUSH
2389 if (vc->vc_need_wrap) {
2390 cr(vc);
2391 lf(vc);
2392 }
2393 if (vc->vc_decim)
2394 insert_char(vc, 1);
2395 scr_writew(himask ?
2396 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2397 (vc_attr << 8) + tc,
2398 (u16 *) vc->vc_pos);
2399 if (DO_UPDATE(vc) && draw_x < 0) {
2400 draw_x = vc->vc_x;
2401 draw_from = vc->vc_pos;
2402 }
2403 if (vc->vc_x == vc->vc_cols - 1) {
2404 vc->vc_need_wrap = vc->vc_decawm;
2405 draw_to = vc->vc_pos + 2;
2406 } else {
2407 vc->vc_x++;
2408 draw_to = (vc->vc_pos += 2);
2409 }
2410
2411 if (!--width) break;
2412
2413 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2414 if (tc < 0) tc = ' ';
2415 }
2416 notify_write(vc, c);
2417
2418 if (inverse) {
2419 FLUSH
2420 }
2421
2422 if (rescan) {
2423 rescan = 0;
2424 inverse = 0;
2425 width = 1;
2426 c = orig;
2427 goto rescan_last_byte;
2428 }
2429 continue;
2430 }
2431 FLUSH
2432 do_con_trol(tty, vc, orig);
2433 }
2434 FLUSH
2435 console_conditional_schedule();
2436 console_unlock();
2437 notify_update(vc);
2438 return n;
2439 #undef FLUSH
2440 }
2441
2442 /*
2443 * This is the console switching callback.
2444 *
2445 * Doing console switching in a process context allows
2446 * us to do the switches asynchronously (needed when we want
2447 * to switch due to a keyboard interrupt). Synchronization
2448 * with other console code and prevention of re-entrancy is
2449 * ensured with console_lock.
2450 */
2451 static void console_callback(struct work_struct *ignored)
2452 {
2453 console_lock();
2454
2455 if (want_console >= 0) {
2456 if (want_console != fg_console &&
2457 vc_cons_allocated(want_console)) {
2458 hide_cursor(vc_cons[fg_console].d);
2459 change_console(vc_cons[want_console].d);
2460 /* we only changed when the console had already
2461 been allocated - a new console is not created
2462 in an interrupt routine */
2463 }
2464 want_console = -1;
2465 }
2466 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2467 do_poke_blanked_console = 0;
2468 poke_blanked_console();
2469 }
2470 if (scrollback_delta) {
2471 struct vc_data *vc = vc_cons[fg_console].d;
2472 clear_selection();
2473 if (vc->vc_mode == KD_TEXT)
2474 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2475 scrollback_delta = 0;
2476 }
2477 if (blank_timer_expired) {
2478 do_blank_screen(0);
2479 blank_timer_expired = 0;
2480 }
2481 notify_update(vc_cons[fg_console].d);
2482
2483 console_unlock();
2484 }
2485
2486 int set_console(int nr)
2487 {
2488 struct vc_data *vc = vc_cons[fg_console].d;
2489
2490 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2491 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2492
2493 /*
2494 * Console switch will fail in console_callback() or
2495 * change_console() so there is no point scheduling
2496 * the callback
2497 *
2498 * Existing set_console() users don't check the return
2499 * value so this shouldn't break anything
2500 */
2501 return -EINVAL;
2502 }
2503
2504 want_console = nr;
2505 schedule_console_callback();
2506
2507 return 0;
2508 }
2509
2510 struct tty_driver *console_driver;
2511
2512 #ifdef CONFIG_VT_CONSOLE
2513
2514 /**
2515 * vt_kmsg_redirect() - Sets/gets the kernel message console
2516 * @new: The new virtual terminal number or -1 if the console should stay
2517 * unchanged
2518 *
2519 * By default, the kernel messages are always printed on the current virtual
2520 * console. However, the user may modify that default with the
2521 * TIOCL_SETKMSGREDIRECT ioctl call.
2522 *
2523 * This function sets the kernel message console to be @new. It returns the old
2524 * virtual console number. The virtual terminal number 0 (both as parameter and
2525 * return value) means no redirection (i.e. always printed on the currently
2526 * active console).
2527 *
2528 * The parameter -1 means that only the current console is returned, but the
2529 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2530 * case to make the code more understandable.
2531 *
2532 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2533 * the parameter and always returns 0.
2534 */
2535 int vt_kmsg_redirect(int new)
2536 {
2537 static int kmsg_con;
2538
2539 if (new != -1)
2540 return xchg(&kmsg_con, new);
2541 else
2542 return kmsg_con;
2543 }
2544
2545 /*
2546 * Console on virtual terminal
2547 *
2548 * The console must be locked when we get here.
2549 */
2550
2551 static void vt_console_print(struct console *co, const char *b, unsigned count)
2552 {
2553 struct vc_data *vc = vc_cons[fg_console].d;
2554 unsigned char c;
2555 static DEFINE_SPINLOCK(printing_lock);
2556 const ushort *start;
2557 ushort cnt = 0;
2558 ushort myx;
2559 int kmsg_console;
2560
2561 /* console busy or not yet initialized */
2562 if (!printable)
2563 return;
2564 if (!spin_trylock(&printing_lock))
2565 return;
2566
2567 kmsg_console = vt_get_kmsg_redirect();
2568 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2569 vc = vc_cons[kmsg_console - 1].d;
2570
2571 /* read `x' only after setting currcons properly (otherwise
2572 the `x' macro will read the x of the foreground console). */
2573 myx = vc->vc_x;
2574
2575 if (!vc_cons_allocated(fg_console)) {
2576 /* impossible */
2577 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2578 goto quit;
2579 }
2580
2581 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2582 goto quit;
2583
2584 /* undraw cursor first */
2585 if (IS_FG(vc))
2586 hide_cursor(vc);
2587
2588 start = (ushort *)vc->vc_pos;
2589
2590 /* Contrived structure to try to emulate original need_wrap behaviour
2591 * Problems caused when we have need_wrap set on '\n' character */
2592 while (count--) {
2593 c = *b++;
2594 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2595 if (cnt > 0) {
2596 if (CON_IS_VISIBLE(vc))
2597 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2598 vc->vc_x += cnt;
2599 if (vc->vc_need_wrap)
2600 vc->vc_x--;
2601 cnt = 0;
2602 }
2603 if (c == 8) { /* backspace */
2604 bs(vc);
2605 start = (ushort *)vc->vc_pos;
2606 myx = vc->vc_x;
2607 continue;
2608 }
2609 if (c != 13)
2610 lf(vc);
2611 cr(vc);
2612 start = (ushort *)vc->vc_pos;
2613 myx = vc->vc_x;
2614 if (c == 10 || c == 13)
2615 continue;
2616 }
2617 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2618 notify_write(vc, c);
2619 cnt++;
2620 if (myx == vc->vc_cols - 1) {
2621 vc->vc_need_wrap = 1;
2622 continue;
2623 }
2624 vc->vc_pos += 2;
2625 myx++;
2626 }
2627 if (cnt > 0) {
2628 if (CON_IS_VISIBLE(vc))
2629 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2630 vc->vc_x += cnt;
2631 if (vc->vc_x == vc->vc_cols) {
2632 vc->vc_x--;
2633 vc->vc_need_wrap = 1;
2634 }
2635 }
2636 set_cursor(vc);
2637 notify_update(vc);
2638
2639 quit:
2640 spin_unlock(&printing_lock);
2641 }
2642
2643 static struct tty_driver *vt_console_device(struct console *c, int *index)
2644 {
2645 *index = c->index ? c->index-1 : fg_console;
2646 return console_driver;
2647 }
2648
2649 static struct console vt_console_driver = {
2650 .name = "tty",
2651 .write = vt_console_print,
2652 .device = vt_console_device,
2653 .unblank = unblank_screen,
2654 .flags = CON_PRINTBUFFER,
2655 .index = -1,
2656 };
2657 #endif
2658
2659 /*
2660 * Handling of Linux-specific VC ioctls
2661 */
2662
2663 /*
2664 * Generally a bit racy with respect to console_lock();.
2665 *
2666 * There are some functions which don't need it.
2667 *
2668 * There are some functions which can sleep for arbitrary periods
2669 * (paste_selection) but we don't need the lock there anyway.
2670 *
2671 * set_selection has locking, and definitely needs it
2672 */
2673
2674 int tioclinux(struct tty_struct *tty, unsigned long arg)
2675 {
2676 char type, data;
2677 char __user *p = (char __user *)arg;
2678 int lines;
2679 int ret;
2680
2681 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2682 return -EPERM;
2683 if (get_user(type, p))
2684 return -EFAULT;
2685 ret = 0;
2686
2687 switch (type)
2688 {
2689 case TIOCL_SETSEL:
2690 console_lock();
2691 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2692 console_unlock();
2693 break;
2694 case TIOCL_PASTESEL:
2695 ret = paste_selection(tty);
2696 break;
2697 case TIOCL_UNBLANKSCREEN:
2698 console_lock();
2699 unblank_screen();
2700 console_unlock();
2701 break;
2702 case TIOCL_SELLOADLUT:
2703 console_lock();
2704 ret = sel_loadlut(p);
2705 console_unlock();
2706 break;
2707 case TIOCL_GETSHIFTSTATE:
2708
2709 /*
2710 * Make it possible to react to Shift+Mousebutton.
2711 * Note that 'shift_state' is an undocumented
2712 * kernel-internal variable; programs not closely
2713 * related to the kernel should not use this.
2714 */
2715 data = vt_get_shift_state();
2716 ret = __put_user(data, p);
2717 break;
2718 case TIOCL_GETMOUSEREPORTING:
2719 console_lock(); /* May be overkill */
2720 data = mouse_reporting();
2721 console_unlock();
2722 ret = __put_user(data, p);
2723 break;
2724 case TIOCL_SETVESABLANK:
2725 console_lock();
2726 ret = set_vesa_blanking(p);
2727 console_unlock();
2728 break;
2729 case TIOCL_GETKMSGREDIRECT:
2730 data = vt_get_kmsg_redirect();
2731 ret = __put_user(data, p);
2732 break;
2733 case TIOCL_SETKMSGREDIRECT:
2734 if (!capable(CAP_SYS_ADMIN)) {
2735 ret = -EPERM;
2736 } else {
2737 if (get_user(data, p+1))
2738 ret = -EFAULT;
2739 else
2740 vt_kmsg_redirect(data);
2741 }
2742 break;
2743 case TIOCL_GETFGCONSOLE:
2744 /* No locking needed as this is a transiently
2745 correct return anyway if the caller hasn't
2746 disabled switching */
2747 ret = fg_console;
2748 break;
2749 case TIOCL_SCROLLCONSOLE:
2750 if (get_user(lines, (s32 __user *)(p+4))) {
2751 ret = -EFAULT;
2752 } else {
2753 /* Need the console lock here. Note that lots
2754 of other calls need fixing before the lock
2755 is actually useful ! */
2756 console_lock();
2757 scrollfront(vc_cons[fg_console].d, lines);
2758 console_unlock();
2759 ret = 0;
2760 }
2761 break;
2762 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2763 console_lock();
2764 ignore_poke = 1;
2765 do_blank_screen(0);
2766 console_unlock();
2767 break;
2768 case TIOCL_BLANKEDSCREEN:
2769 ret = console_blanked;
2770 break;
2771 default:
2772 ret = -EINVAL;
2773 break;
2774 }
2775 return ret;
2776 }
2777
2778 /*
2779 * /dev/ttyN handling
2780 */
2781
2782 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2783 {
2784 int retval;
2785
2786 retval = do_con_write(tty, buf, count);
2787 con_flush_chars(tty);
2788
2789 return retval;
2790 }
2791
2792 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2793 {
2794 if (in_interrupt())
2795 return 0; /* n_r3964 calls put_char() from interrupt context */
2796 return do_con_write(tty, &ch, 1);
2797 }
2798
2799 static int con_write_room(struct tty_struct *tty)
2800 {
2801 if (tty->stopped)
2802 return 0;
2803 return 32768; /* No limit, really; we're not buffering */
2804 }
2805
2806 static int con_chars_in_buffer(struct tty_struct *tty)
2807 {
2808 return 0; /* we're not buffering */
2809 }
2810
2811 /*
2812 * con_throttle and con_unthrottle are only used for
2813 * paste_selection(), which has to stuff in a large number of
2814 * characters...
2815 */
2816 static void con_throttle(struct tty_struct *tty)
2817 {
2818 }
2819
2820 static void con_unthrottle(struct tty_struct *tty)
2821 {
2822 struct vc_data *vc = tty->driver_data;
2823
2824 wake_up_interruptible(&vc->paste_wait);
2825 }
2826
2827 /*
2828 * Turn the Scroll-Lock LED on when the tty is stopped
2829 */
2830 static void con_stop(struct tty_struct *tty)
2831 {
2832 int console_num;
2833 if (!tty)
2834 return;
2835 console_num = tty->index;
2836 if (!vc_cons_allocated(console_num))
2837 return;
2838 vt_kbd_con_stop(console_num);
2839 }
2840
2841 /*
2842 * Turn the Scroll-Lock LED off when the console is started
2843 */
2844 static void con_start(struct tty_struct *tty)
2845 {
2846 int console_num;
2847 if (!tty)
2848 return;
2849 console_num = tty->index;
2850 if (!vc_cons_allocated(console_num))
2851 return;
2852 vt_kbd_con_start(console_num);
2853 }
2854
2855 static void con_flush_chars(struct tty_struct *tty)
2856 {
2857 struct vc_data *vc;
2858
2859 if (in_interrupt()) /* from flush_to_ldisc */
2860 return;
2861
2862 /* if we race with con_close(), vt may be null */
2863 console_lock();
2864 vc = tty->driver_data;
2865 if (vc)
2866 set_cursor(vc);
2867 console_unlock();
2868 }
2869
2870 /*
2871 * Allocate the console screen memory.
2872 */
2873 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2874 {
2875 unsigned int currcons = tty->index;
2876 struct vc_data *vc;
2877 int ret;
2878
2879 console_lock();
2880 ret = vc_allocate(currcons);
2881 if (ret)
2882 goto unlock;
2883
2884 vc = vc_cons[currcons].d;
2885
2886 /* Still being freed */
2887 if (vc->port.tty) {
2888 ret = -ERESTARTSYS;
2889 goto unlock;
2890 }
2891
2892 ret = tty_port_install(&vc->port, driver, tty);
2893 if (ret)
2894 goto unlock;
2895
2896 tty->driver_data = vc;
2897 vc->port.tty = tty;
2898
2899 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2900 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2901 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2902 }
2903 if (vc->vc_utf)
2904 tty->termios.c_iflag |= IUTF8;
2905 else
2906 tty->termios.c_iflag &= ~IUTF8;
2907 unlock:
2908 console_unlock();
2909 return ret;
2910 }
2911
2912 static int con_open(struct tty_struct *tty, struct file *filp)
2913 {
2914 /* everything done in install */
2915 return 0;
2916 }
2917
2918
2919 static void con_close(struct tty_struct *tty, struct file *filp)
2920 {
2921 /* Nothing to do - we defer to shutdown */
2922 }
2923
2924 static void con_shutdown(struct tty_struct *tty)
2925 {
2926 struct vc_data *vc = tty->driver_data;
2927 BUG_ON(vc == NULL);
2928 console_lock();
2929 vc->port.tty = NULL;
2930 console_unlock();
2931 }
2932
2933 static int default_color = 7; /* white */
2934 static int default_italic_color = 2; // green (ASCII)
2935 static int default_underline_color = 3; // cyan (ASCII)
2936 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2937 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2938 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2939
2940 static void vc_init(struct vc_data *vc, unsigned int rows,
2941 unsigned int cols, int do_clear)
2942 {
2943 int j, k ;
2944
2945 vc->vc_cols = cols;
2946 vc->vc_rows = rows;
2947 vc->vc_size_row = cols << 1;
2948 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2949
2950 set_origin(vc);
2951 vc->vc_pos = vc->vc_origin;
2952 reset_vc(vc);
2953 for (j=k=0; j<16; j++) {
2954 vc->vc_palette[k++] = default_red[j] ;
2955 vc->vc_palette[k++] = default_grn[j] ;
2956 vc->vc_palette[k++] = default_blu[j] ;
2957 }
2958 vc->vc_def_color = default_color;
2959 vc->vc_ulcolor = default_underline_color;
2960 vc->vc_itcolor = default_italic_color;
2961 vc->vc_halfcolor = 0x08; /* grey */
2962 init_waitqueue_head(&vc->paste_wait);
2963 reset_terminal(vc, do_clear);
2964 }
2965
2966 /*
2967 * This routine initializes console interrupts, and does nothing
2968 * else. If you want the screen to clear, call tty_write with
2969 * the appropriate escape-sequence.
2970 */
2971
2972 static int __init con_init(void)
2973 {
2974 const char *display_desc = NULL;
2975 struct vc_data *vc;
2976 unsigned int currcons = 0, i;
2977
2978 console_lock();
2979
2980 if (conswitchp)
2981 display_desc = conswitchp->con_startup();
2982 if (!display_desc) {
2983 fg_console = 0;
2984 console_unlock();
2985 return 0;
2986 }
2987
2988 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2989 struct con_driver *con_driver = &registered_con_driver[i];
2990
2991 if (con_driver->con == NULL) {
2992 con_driver->con = conswitchp;
2993 con_driver->desc = display_desc;
2994 con_driver->flag = CON_DRIVER_FLAG_INIT;
2995 con_driver->first = 0;
2996 con_driver->last = MAX_NR_CONSOLES - 1;
2997 break;
2998 }
2999 }
3000
3001 for (i = 0; i < MAX_NR_CONSOLES; i++)
3002 con_driver_map[i] = conswitchp;
3003
3004 if (blankinterval) {
3005 blank_state = blank_normal_wait;
3006 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3007 }
3008
3009 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3010 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3011 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3012 tty_port_init(&vc->port);
3013 visual_init(vc, currcons, 1);
3014 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3015 vc_init(vc, vc->vc_rows, vc->vc_cols,
3016 currcons || !vc->vc_sw->con_save_screen);
3017 }
3018 currcons = fg_console = 0;
3019 master_display_fg = vc = vc_cons[currcons].d;
3020 set_origin(vc);
3021 save_screen(vc);
3022 gotoxy(vc, vc->vc_x, vc->vc_y);
3023 csi_J(vc, 0);
3024 update_screen(vc);
3025 pr_info("Console: %s %s %dx%d\n",
3026 vc->vc_can_do_color ? "colour" : "mono",
3027 display_desc, vc->vc_cols, vc->vc_rows);
3028 printable = 1;
3029
3030 console_unlock();
3031
3032 #ifdef CONFIG_VT_CONSOLE
3033 register_console(&vt_console_driver);
3034 #endif
3035 return 0;
3036 }
3037 console_initcall(con_init);
3038
3039 static const struct tty_operations con_ops = {
3040 .install = con_install,
3041 .open = con_open,
3042 .close = con_close,
3043 .write = con_write,
3044 .write_room = con_write_room,
3045 .put_char = con_put_char,
3046 .flush_chars = con_flush_chars,
3047 .chars_in_buffer = con_chars_in_buffer,
3048 .ioctl = vt_ioctl,
3049 #ifdef CONFIG_COMPAT
3050 .compat_ioctl = vt_compat_ioctl,
3051 #endif
3052 .stop = con_stop,
3053 .start = con_start,
3054 .throttle = con_throttle,
3055 .unthrottle = con_unthrottle,
3056 .resize = vt_resize,
3057 .shutdown = con_shutdown
3058 };
3059
3060 static struct cdev vc0_cdev;
3061
3062 static ssize_t show_tty_active(struct device *dev,
3063 struct device_attribute *attr, char *buf)
3064 {
3065 return sprintf(buf, "tty%d\n", fg_console + 1);
3066 }
3067 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3068
3069 static struct attribute *vt_dev_attrs[] = {
3070 &dev_attr_active.attr,
3071 NULL
3072 };
3073
3074 ATTRIBUTE_GROUPS(vt_dev);
3075
3076 int __init vty_init(const struct file_operations *console_fops)
3077 {
3078 cdev_init(&vc0_cdev, console_fops);
3079 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3080 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3081 panic("Couldn't register /dev/tty0 driver\n");
3082 tty0dev = device_create_with_groups(tty_class, NULL,
3083 MKDEV(TTY_MAJOR, 0), NULL,
3084 vt_dev_groups, "tty0");
3085 if (IS_ERR(tty0dev))
3086 tty0dev = NULL;
3087
3088 vcs_init();
3089
3090 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3091 if (!console_driver)
3092 panic("Couldn't allocate console driver\n");
3093
3094 console_driver->name = "tty";
3095 console_driver->name_base = 1;
3096 console_driver->major = TTY_MAJOR;
3097 console_driver->minor_start = 1;
3098 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3099 console_driver->init_termios = tty_std_termios;
3100 if (default_utf8)
3101 console_driver->init_termios.c_iflag |= IUTF8;
3102 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3103 tty_set_operations(console_driver, &con_ops);
3104 if (tty_register_driver(console_driver))
3105 panic("Couldn't register console driver\n");
3106 kbd_init();
3107 console_map_init();
3108 #ifdef CONFIG_MDA_CONSOLE
3109 mda_console_init();
3110 #endif
3111 return 0;
3112 }
3113
3114 #ifndef VT_SINGLE_DRIVER
3115
3116 static struct class *vtconsole_class;
3117
3118 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3119 int deflt)
3120 {
3121 struct module *owner = csw->owner;
3122 const char *desc = NULL;
3123 struct con_driver *con_driver;
3124 int i, j = -1, k = -1, retval = -ENODEV;
3125
3126 if (!try_module_get(owner))
3127 return -ENODEV;
3128
3129 WARN_CONSOLE_UNLOCKED();
3130
3131 /* check if driver is registered */
3132 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3133 con_driver = &registered_con_driver[i];
3134
3135 if (con_driver->con == csw) {
3136 desc = con_driver->desc;
3137 retval = 0;
3138 break;
3139 }
3140 }
3141
3142 if (retval)
3143 goto err;
3144
3145 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3146 csw->con_startup();
3147 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3148 }
3149
3150 if (deflt) {
3151 if (conswitchp)
3152 module_put(conswitchp->owner);
3153
3154 __module_get(owner);
3155 conswitchp = csw;
3156 }
3157
3158 first = max(first, con_driver->first);
3159 last = min(last, con_driver->last);
3160
3161 for (i = first; i <= last; i++) {
3162 int old_was_color;
3163 struct vc_data *vc = vc_cons[i].d;
3164
3165 if (con_driver_map[i])
3166 module_put(con_driver_map[i]->owner);
3167 __module_get(owner);
3168 con_driver_map[i] = csw;
3169
3170 if (!vc || !vc->vc_sw)
3171 continue;
3172
3173 j = i;
3174
3175 if (CON_IS_VISIBLE(vc)) {
3176 k = i;
3177 save_screen(vc);
3178 }
3179
3180 old_was_color = vc->vc_can_do_color;
3181 vc->vc_sw->con_deinit(vc);
3182 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3183 visual_init(vc, i, 0);
3184 set_origin(vc);
3185 update_attr(vc);
3186
3187 /* If the console changed between mono <-> color, then
3188 * the attributes in the screenbuf will be wrong. The
3189 * following resets all attributes to something sane.
3190 */
3191 if (old_was_color != vc->vc_can_do_color)
3192 clear_buffer_attributes(vc);
3193 }
3194
3195 pr_info("Console: switching ");
3196 if (!deflt)
3197 printk("consoles %d-%d ", first+1, last+1);
3198 if (j >= 0) {
3199 struct vc_data *vc = vc_cons[j].d;
3200
3201 printk("to %s %s %dx%d\n",
3202 vc->vc_can_do_color ? "colour" : "mono",
3203 desc, vc->vc_cols, vc->vc_rows);
3204
3205 if (k >= 0) {
3206 vc = vc_cons[k].d;
3207 update_screen(vc);
3208 }
3209 } else
3210 printk("to %s\n", desc);
3211
3212 retval = 0;
3213 err:
3214 module_put(owner);
3215 return retval;
3216 };
3217
3218
3219 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3220 /* unlocked version of unbind_con_driver() */
3221 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3222 {
3223 struct module *owner = csw->owner;
3224 const struct consw *defcsw = NULL;
3225 struct con_driver *con_driver = NULL, *con_back = NULL;
3226 int i, retval = -ENODEV;
3227
3228 if (!try_module_get(owner))
3229 return -ENODEV;
3230
3231 WARN_CONSOLE_UNLOCKED();
3232
3233 /* check if driver is registered and if it is unbindable */
3234 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3235 con_driver = &registered_con_driver[i];
3236
3237 if (con_driver->con == csw &&
3238 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3239 retval = 0;
3240 break;
3241 }
3242 }
3243
3244 if (retval)
3245 goto err;
3246
3247 retval = -ENODEV;
3248
3249 /* check if backup driver exists */
3250 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3251 con_back = &registered_con_driver[i];
3252
3253 if (con_back->con && con_back->con != csw) {
3254 defcsw = con_back->con;
3255 retval = 0;
3256 break;
3257 }
3258 }
3259
3260 if (retval)
3261 goto err;
3262
3263 if (!con_is_bound(csw))
3264 goto err;
3265
3266 first = max(first, con_driver->first);
3267 last = min(last, con_driver->last);
3268
3269 for (i = first; i <= last; i++) {
3270 if (con_driver_map[i] == csw) {
3271 module_put(csw->owner);
3272 con_driver_map[i] = NULL;
3273 }
3274 }
3275
3276 if (!con_is_bound(defcsw)) {
3277 const struct consw *defconsw = conswitchp;
3278
3279 defcsw->con_startup();
3280 con_back->flag |= CON_DRIVER_FLAG_INIT;
3281 /*
3282 * vgacon may change the default driver to point
3283 * to dummycon, we restore it here...
3284 */
3285 conswitchp = defconsw;
3286 }
3287
3288 if (!con_is_bound(csw))
3289 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3290
3291 /* ignore return value, binding should not fail */
3292 do_bind_con_driver(defcsw, first, last, deflt);
3293 err:
3294 module_put(owner);
3295 return retval;
3296
3297 }
3298 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3299
3300 static int vt_bind(struct con_driver *con)
3301 {
3302 const struct consw *defcsw = NULL, *csw = NULL;
3303 int i, more = 1, first = -1, last = -1, deflt = 0;
3304
3305 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3306 goto err;
3307
3308 csw = con->con;
3309
3310 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3311 struct con_driver *con = &registered_con_driver[i];
3312
3313 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3314 defcsw = con->con;
3315 break;
3316 }
3317 }
3318
3319 if (!defcsw)
3320 goto err;
3321
3322 while (more) {
3323 more = 0;
3324
3325 for (i = con->first; i <= con->last; i++) {
3326 if (con_driver_map[i] == defcsw) {
3327 if (first == -1)
3328 first = i;
3329 last = i;
3330 more = 1;
3331 } else if (first != -1)
3332 break;
3333 }
3334
3335 if (first == 0 && last == MAX_NR_CONSOLES -1)
3336 deflt = 1;
3337
3338 if (first != -1)
3339 do_bind_con_driver(csw, first, last, deflt);
3340
3341 first = -1;
3342 last = -1;
3343 deflt = 0;
3344 }
3345
3346 err:
3347 return 0;
3348 }
3349
3350 static int vt_unbind(struct con_driver *con)
3351 {
3352 const struct consw *csw = NULL;
3353 int i, more = 1, first = -1, last = -1, deflt = 0;
3354 int ret;
3355
3356 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3357 goto err;
3358
3359 csw = con->con;
3360
3361 while (more) {
3362 more = 0;
3363
3364 for (i = con->first; i <= con->last; i++) {
3365 if (con_driver_map[i] == csw) {
3366 if (first == -1)
3367 first = i;
3368 last = i;
3369 more = 1;
3370 } else if (first != -1)
3371 break;
3372 }
3373
3374 if (first == 0 && last == MAX_NR_CONSOLES -1)
3375 deflt = 1;
3376
3377 if (first != -1) {
3378 ret = do_unbind_con_driver(csw, first, last, deflt);
3379 if (ret != 0)
3380 return ret;
3381 }
3382
3383 first = -1;
3384 last = -1;
3385 deflt = 0;
3386 }
3387
3388 err:
3389 return 0;
3390 }
3391 #else
3392 static inline int vt_bind(struct con_driver *con)
3393 {
3394 return 0;
3395 }
3396 static inline int vt_unbind(struct con_driver *con)
3397 {
3398 return 0;
3399 }
3400 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3401
3402 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3403 const char *buf, size_t count)
3404 {
3405 struct con_driver *con = dev_get_drvdata(dev);
3406 int bind = simple_strtoul(buf, NULL, 0);
3407
3408 console_lock();
3409
3410 if (bind)
3411 vt_bind(con);
3412 else
3413 vt_unbind(con);
3414
3415 console_unlock();
3416
3417 return count;
3418 }
3419
3420 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3421 char *buf)
3422 {
3423 struct con_driver *con = dev_get_drvdata(dev);
3424 int bind = con_is_bound(con->con);
3425
3426 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3427 }
3428
3429 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3430 char *buf)
3431 {
3432 struct con_driver *con = dev_get_drvdata(dev);
3433
3434 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3435 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3436 con->desc);
3437
3438 }
3439
3440 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3441 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3442
3443 static struct attribute *con_dev_attrs[] = {
3444 &dev_attr_bind.attr,
3445 &dev_attr_name.attr,
3446 NULL
3447 };
3448
3449 ATTRIBUTE_GROUPS(con_dev);
3450
3451 static int vtconsole_init_device(struct con_driver *con)
3452 {
3453 con->flag |= CON_DRIVER_FLAG_ATTR;
3454 return 0;
3455 }
3456
3457 static void vtconsole_deinit_device(struct con_driver *con)
3458 {
3459 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3460 }
3461
3462 /**
3463 * con_is_bound - checks if driver is bound to the console
3464 * @csw: console driver
3465 *
3466 * RETURNS: zero if unbound, nonzero if bound
3467 *
3468 * Drivers can call this and if zero, they should release
3469 * all resources allocated on con_startup()
3470 */
3471 int con_is_bound(const struct consw *csw)
3472 {
3473 int i, bound = 0;
3474
3475 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3476 if (con_driver_map[i] == csw) {
3477 bound = 1;
3478 break;
3479 }
3480 }
3481
3482 return bound;
3483 }
3484 EXPORT_SYMBOL(con_is_bound);
3485
3486 /**
3487 * con_debug_enter - prepare the console for the kernel debugger
3488 * @sw: console driver
3489 *
3490 * Called when the console is taken over by the kernel debugger, this
3491 * function needs to save the current console state, then put the console
3492 * into a state suitable for the kernel debugger.
3493 *
3494 * RETURNS:
3495 * Zero on success, nonzero if a failure occurred when trying to prepare
3496 * the console for the debugger.
3497 */
3498 int con_debug_enter(struct vc_data *vc)
3499 {
3500 int ret = 0;
3501
3502 saved_fg_console = fg_console;
3503 saved_last_console = last_console;
3504 saved_want_console = want_console;
3505 saved_vc_mode = vc->vc_mode;
3506 saved_console_blanked = console_blanked;
3507 vc->vc_mode = KD_TEXT;
3508 console_blanked = 0;
3509 if (vc->vc_sw->con_debug_enter)
3510 ret = vc->vc_sw->con_debug_enter(vc);
3511 #ifdef CONFIG_KGDB_KDB
3512 /* Set the initial LINES variable if it is not already set */
3513 if (vc->vc_rows < 999) {
3514 int linecount;
3515 char lns[4];
3516 const char *setargs[3] = {
3517 "set",
3518 "LINES",
3519 lns,
3520 };
3521 if (kdbgetintenv(setargs[0], &linecount)) {
3522 snprintf(lns, 4, "%i", vc->vc_rows);
3523 kdb_set(2, setargs);
3524 }
3525 }
3526 if (vc->vc_cols < 999) {
3527 int colcount;
3528 char cols[4];
3529 const char *setargs[3] = {
3530 "set",
3531 "COLUMNS",
3532 cols,
3533 };
3534 if (kdbgetintenv(setargs[0], &colcount)) {
3535 snprintf(cols, 4, "%i", vc->vc_cols);
3536 kdb_set(2, setargs);
3537 }
3538 }
3539 #endif /* CONFIG_KGDB_KDB */
3540 return ret;
3541 }
3542 EXPORT_SYMBOL_GPL(con_debug_enter);
3543
3544 /**
3545 * con_debug_leave - restore console state
3546 * @sw: console driver
3547 *
3548 * Restore the console state to what it was before the kernel debugger
3549 * was invoked.
3550 *
3551 * RETURNS:
3552 * Zero on success, nonzero if a failure occurred when trying to restore
3553 * the console.
3554 */
3555 int con_debug_leave(void)
3556 {
3557 struct vc_data *vc;
3558 int ret = 0;
3559
3560 fg_console = saved_fg_console;
3561 last_console = saved_last_console;
3562 want_console = saved_want_console;
3563 console_blanked = saved_console_blanked;
3564 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3565
3566 vc = vc_cons[fg_console].d;
3567 if (vc->vc_sw->con_debug_leave)
3568 ret = vc->vc_sw->con_debug_leave(vc);
3569 return ret;
3570 }
3571 EXPORT_SYMBOL_GPL(con_debug_leave);
3572
3573 static int do_register_con_driver(const struct consw *csw, int first, int last)
3574 {
3575 struct module *owner = csw->owner;
3576 struct con_driver *con_driver;
3577 const char *desc;
3578 int i, retval;
3579
3580 WARN_CONSOLE_UNLOCKED();
3581
3582 if (!try_module_get(owner))
3583 return -ENODEV;
3584
3585 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3586 con_driver = &registered_con_driver[i];
3587
3588 /* already registered */
3589 if (con_driver->con == csw) {
3590 retval = -EBUSY;
3591 goto err;
3592 }
3593 }
3594
3595 desc = csw->con_startup();
3596 if (!desc) {
3597 retval = -ENODEV;
3598 goto err;
3599 }
3600
3601 retval = -EINVAL;
3602
3603 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3604 con_driver = &registered_con_driver[i];
3605
3606 if (con_driver->con == NULL &&
3607 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3608 con_driver->con = csw;
3609 con_driver->desc = desc;
3610 con_driver->node = i;
3611 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3612 CON_DRIVER_FLAG_INIT;
3613 con_driver->first = first;
3614 con_driver->last = last;
3615 retval = 0;
3616 break;
3617 }
3618 }
3619
3620 if (retval)
3621 goto err;
3622
3623 con_driver->dev =
3624 device_create_with_groups(vtconsole_class, NULL,
3625 MKDEV(0, con_driver->node),
3626 con_driver, con_dev_groups,
3627 "vtcon%i", con_driver->node);
3628 if (IS_ERR(con_driver->dev)) {
3629 printk(KERN_WARNING "Unable to create device for %s; "
3630 "errno = %ld\n", con_driver->desc,
3631 PTR_ERR(con_driver->dev));
3632 con_driver->dev = NULL;
3633 } else {
3634 vtconsole_init_device(con_driver);
3635 }
3636
3637 err:
3638 module_put(owner);
3639 return retval;
3640 }
3641
3642
3643 /**
3644 * do_unregister_con_driver - unregister console driver from console layer
3645 * @csw: console driver
3646 *
3647 * DESCRIPTION: All drivers that registers to the console layer must
3648 * call this function upon exit, or if the console driver is in a state
3649 * where it won't be able to handle console services, such as the
3650 * framebuffer console without loaded framebuffer drivers.
3651 *
3652 * The driver must unbind first prior to unregistration.
3653 */
3654 int do_unregister_con_driver(const struct consw *csw)
3655 {
3656 int i;
3657
3658 /* cannot unregister a bound driver */
3659 if (con_is_bound(csw))
3660 return -EBUSY;
3661
3662 if (csw == conswitchp)
3663 return -EINVAL;
3664
3665 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3666 struct con_driver *con_driver = &registered_con_driver[i];
3667
3668 if (con_driver->con == csw) {
3669 /*
3670 * Defer the removal of the sysfs entries since that
3671 * will acquire the kernfs s_active lock and we can't
3672 * acquire this lock while holding the console lock:
3673 * the unbind sysfs entry imposes already the opposite
3674 * order. Reset con already here to prevent any later
3675 * lookup to succeed and mark this slot as zombie, so
3676 * it won't get reused until we complete the removal
3677 * in the deferred work.
3678 */
3679 con_driver->con = NULL;
3680 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3681 schedule_work(&con_driver_unregister_work);
3682
3683 return 0;
3684 }
3685 }
3686
3687 return -ENODEV;
3688 }
3689 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3690
3691 static void con_driver_unregister_callback(struct work_struct *ignored)
3692 {
3693 int i;
3694
3695 console_lock();
3696
3697 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3698 struct con_driver *con_driver = &registered_con_driver[i];
3699
3700 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3701 continue;
3702
3703 console_unlock();
3704
3705 vtconsole_deinit_device(con_driver);
3706 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3707
3708 console_lock();
3709
3710 if (WARN_ON_ONCE(con_driver->con))
3711 con_driver->con = NULL;
3712 con_driver->desc = NULL;
3713 con_driver->dev = NULL;
3714 con_driver->node = 0;
3715 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3716 con_driver->flag = 0;
3717 con_driver->first = 0;
3718 con_driver->last = 0;
3719 }
3720
3721 console_unlock();
3722 }
3723
3724 /*
3725 * If we support more console drivers, this function is used
3726 * when a driver wants to take over some existing consoles
3727 * and become default driver for newly opened ones.
3728 *
3729 * do_take_over_console is basically a register followed by unbind
3730 */
3731 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3732 {
3733 int err;
3734
3735 err = do_register_con_driver(csw, first, last);
3736 /*
3737 * If we get an busy error we still want to bind the console driver
3738 * and return success, as we may have unbound the console driver
3739 * but not unregistered it.
3740 */
3741 if (err == -EBUSY)
3742 err = 0;
3743 if (!err)
3744 do_bind_con_driver(csw, first, last, deflt);
3745
3746 return err;
3747 }
3748 EXPORT_SYMBOL_GPL(do_take_over_console);
3749
3750
3751 /*
3752 * give_up_console is a wrapper to unregister_con_driver. It will only
3753 * work if driver is fully unbound.
3754 */
3755 void give_up_console(const struct consw *csw)
3756 {
3757 console_lock();
3758 do_unregister_con_driver(csw);
3759 console_unlock();
3760 }
3761
3762 static int __init vtconsole_class_init(void)
3763 {
3764 int i;
3765
3766 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3767 if (IS_ERR(vtconsole_class)) {
3768 printk(KERN_WARNING "Unable to create vt console class; "
3769 "errno = %ld\n", PTR_ERR(vtconsole_class));
3770 vtconsole_class = NULL;
3771 }
3772
3773 /* Add system drivers to sysfs */
3774 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3775 struct con_driver *con = &registered_con_driver[i];
3776
3777 if (con->con && !con->dev) {
3778 con->dev =
3779 device_create_with_groups(vtconsole_class, NULL,
3780 MKDEV(0, con->node),
3781 con, con_dev_groups,
3782 "vtcon%i", con->node);
3783
3784 if (IS_ERR(con->dev)) {
3785 printk(KERN_WARNING "Unable to create "
3786 "device for %s; errno = %ld\n",
3787 con->desc, PTR_ERR(con->dev));
3788 con->dev = NULL;
3789 } else {
3790 vtconsole_init_device(con);
3791 }
3792 }
3793 }
3794
3795 return 0;
3796 }
3797 postcore_initcall(vtconsole_class_init);
3798
3799 #endif
3800
3801 /*
3802 * Screen blanking
3803 */
3804
3805 static int set_vesa_blanking(char __user *p)
3806 {
3807 unsigned int mode;
3808
3809 if (get_user(mode, p + 1))
3810 return -EFAULT;
3811
3812 vesa_blank_mode = (mode < 4) ? mode : 0;
3813 return 0;
3814 }
3815
3816 void do_blank_screen(int entering_gfx)
3817 {
3818 struct vc_data *vc = vc_cons[fg_console].d;
3819 int i;
3820
3821 WARN_CONSOLE_UNLOCKED();
3822
3823 if (console_blanked) {
3824 if (blank_state == blank_vesa_wait) {
3825 blank_state = blank_off;
3826 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3827 }
3828 return;
3829 }
3830
3831 /* entering graphics mode? */
3832 if (entering_gfx) {
3833 hide_cursor(vc);
3834 save_screen(vc);
3835 vc->vc_sw->con_blank(vc, -1, 1);
3836 console_blanked = fg_console + 1;
3837 blank_state = blank_off;
3838 set_origin(vc);
3839 return;
3840 }
3841
3842 if (blank_state != blank_normal_wait)
3843 return;
3844 blank_state = blank_off;
3845
3846 /* don't blank graphics */
3847 if (vc->vc_mode != KD_TEXT) {
3848 console_blanked = fg_console + 1;
3849 return;
3850 }
3851
3852 hide_cursor(vc);
3853 del_timer_sync(&console_timer);
3854 blank_timer_expired = 0;
3855
3856 save_screen(vc);
3857 /* In case we need to reset origin, blanking hook returns 1 */
3858 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3859 console_blanked = fg_console + 1;
3860 if (i)
3861 set_origin(vc);
3862
3863 if (console_blank_hook && console_blank_hook(1))
3864 return;
3865
3866 if (vesa_off_interval && vesa_blank_mode) {
3867 blank_state = blank_vesa_wait;
3868 mod_timer(&console_timer, jiffies + vesa_off_interval);
3869 }
3870 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3871 }
3872 EXPORT_SYMBOL(do_blank_screen);
3873
3874 /*
3875 * Called by timer as well as from vt_console_driver
3876 */
3877 void do_unblank_screen(int leaving_gfx)
3878 {
3879 struct vc_data *vc;
3880
3881 /* This should now always be called from a "sane" (read: can schedule)
3882 * context for the sake of the low level drivers, except in the special
3883 * case of oops_in_progress
3884 */
3885 if (!oops_in_progress)
3886 might_sleep();
3887
3888 WARN_CONSOLE_UNLOCKED();
3889
3890 ignore_poke = 0;
3891 if (!console_blanked)
3892 return;
3893 if (!vc_cons_allocated(fg_console)) {
3894 /* impossible */
3895 pr_warn("unblank_screen: tty %d not allocated ??\n",
3896 fg_console + 1);
3897 return;
3898 }
3899 vc = vc_cons[fg_console].d;
3900 /* Try to unblank in oops case too */
3901 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3902 return; /* but leave console_blanked != 0 */
3903
3904 if (blankinterval) {
3905 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3906 blank_state = blank_normal_wait;
3907 }
3908
3909 console_blanked = 0;
3910 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3911 /* Low-level driver cannot restore -> do it ourselves */
3912 update_screen(vc);
3913 if (console_blank_hook)
3914 console_blank_hook(0);
3915 set_palette(vc);
3916 set_cursor(vc);
3917 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3918 }
3919 EXPORT_SYMBOL(do_unblank_screen);
3920
3921 /*
3922 * This is called by the outside world to cause a forced unblank, mostly for
3923 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3924 * call it with 1 as an argument and so force a mode restore... that may kill
3925 * X or at least garbage the screen but would also make the Oops visible...
3926 */
3927 void unblank_screen(void)
3928 {
3929 do_unblank_screen(0);
3930 }
3931
3932 /*
3933 * We defer the timer blanking to work queue so it can take the console mutex
3934 * (console operations can still happen at irq time, but only from printk which
3935 * has the console mutex. Not perfect yet, but better than no locking
3936 */
3937 static void blank_screen_t(unsigned long dummy)
3938 {
3939 if (unlikely(!keventd_up())) {
3940 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3941 return;
3942 }
3943 blank_timer_expired = 1;
3944 schedule_work(&console_work);
3945 }
3946
3947 void poke_blanked_console(void)
3948 {
3949 WARN_CONSOLE_UNLOCKED();
3950
3951 /* Add this so we quickly catch whoever might call us in a non
3952 * safe context. Nowadays, unblank_screen() isn't to be called in
3953 * atomic contexts and is allowed to schedule (with the special case
3954 * of oops_in_progress, but that isn't of any concern for this
3955 * function. --BenH.
3956 */
3957 might_sleep();
3958
3959 /* This isn't perfectly race free, but a race here would be mostly harmless,
3960 * at worse, we'll do a spurrious blank and it's unlikely
3961 */
3962 del_timer(&console_timer);
3963 blank_timer_expired = 0;
3964
3965 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3966 return;
3967 if (console_blanked)
3968 unblank_screen();
3969 else if (blankinterval) {
3970 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3971 blank_state = blank_normal_wait;
3972 }
3973 }
3974
3975 /*
3976 * Palettes
3977 */
3978
3979 static void set_palette(struct vc_data *vc)
3980 {
3981 WARN_CONSOLE_UNLOCKED();
3982
3983 if (vc->vc_mode != KD_GRAPHICS)
3984 vc->vc_sw->con_set_palette(vc, color_table);
3985 }
3986
3987 /*
3988 * Load palette into the DAC registers. arg points to a colour
3989 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3990 */
3991
3992 int con_set_cmap(unsigned char __user *arg)
3993 {
3994 int i, j, k;
3995 unsigned char colormap[3*16];
3996
3997 if (copy_from_user(colormap, arg, sizeof(colormap)))
3998 return -EFAULT;
3999
4000 console_lock();
4001 for (i = k = 0; i < 16; i++) {
4002 default_red[i] = colormap[k++];
4003 default_grn[i] = colormap[k++];
4004 default_blu[i] = colormap[k++];
4005 }
4006 for (i = 0; i < MAX_NR_CONSOLES; i++) {
4007 if (!vc_cons_allocated(i))
4008 continue;
4009 for (j = k = 0; j < 16; j++) {
4010 vc_cons[i].d->vc_palette[k++] = default_red[j];
4011 vc_cons[i].d->vc_palette[k++] = default_grn[j];
4012 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4013 }
4014 set_palette(vc_cons[i].d);
4015 }
4016 console_unlock();
4017
4018 return 0;
4019 }
4020
4021 int con_get_cmap(unsigned char __user *arg)
4022 {
4023 int i, k;
4024 unsigned char colormap[3*16];
4025
4026 console_lock();
4027 for (i = k = 0; i < 16; i++) {
4028 colormap[k++] = default_red[i];
4029 colormap[k++] = default_grn[i];
4030 colormap[k++] = default_blu[i];
4031 }
4032 console_unlock();
4033
4034 if (copy_to_user(arg, colormap, sizeof(colormap)))
4035 return -EFAULT;
4036
4037 return 0;
4038 }
4039
4040 void reset_palette(struct vc_data *vc)
4041 {
4042 int j, k;
4043 for (j=k=0; j<16; j++) {
4044 vc->vc_palette[k++] = default_red[j];
4045 vc->vc_palette[k++] = default_grn[j];
4046 vc->vc_palette[k++] = default_blu[j];
4047 }
4048 set_palette(vc);
4049 }
4050
4051 /*
4052 * Font switching
4053 *
4054 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4055 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4056 * depending on width) reserved for each character which is kinda wasty, but
4057 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4058 * is up to the actual low-level console-driver convert data into its favorite
4059 * format (maybe we should add a `fontoffset' field to the `display'
4060 * structure so we won't have to convert the fontdata all the time.
4061 * /Jes
4062 */
4063
4064 #define max_font_size 65536
4065
4066 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4067 {
4068 struct console_font font;
4069 int rc = -EINVAL;
4070 int c;
4071
4072 if (op->data) {
4073 font.data = kmalloc(max_font_size, GFP_KERNEL);
4074 if (!font.data)
4075 return -ENOMEM;
4076 } else
4077 font.data = NULL;
4078
4079 console_lock();
4080 if (vc->vc_mode != KD_TEXT)
4081 rc = -EINVAL;
4082 else if (vc->vc_sw->con_font_get)
4083 rc = vc->vc_sw->con_font_get(vc, &font);
4084 else
4085 rc = -ENOSYS;
4086 console_unlock();
4087
4088 if (rc)
4089 goto out;
4090
4091 c = (font.width+7)/8 * 32 * font.charcount;
4092
4093 if (op->data && font.charcount > op->charcount)
4094 rc = -ENOSPC;
4095 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4096 if (font.width > op->width || font.height > op->height)
4097 rc = -ENOSPC;
4098 } else {
4099 if (font.width != 8)
4100 rc = -EIO;
4101 else if ((op->height && font.height > op->height) ||
4102 font.height > 32)
4103 rc = -ENOSPC;
4104 }
4105 if (rc)
4106 goto out;
4107
4108 op->height = font.height;
4109 op->width = font.width;
4110 op->charcount = font.charcount;
4111
4112 if (op->data && copy_to_user(op->data, font.data, c))
4113 rc = -EFAULT;
4114
4115 out:
4116 kfree(font.data);
4117 return rc;
4118 }
4119
4120 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4121 {
4122 struct console_font font;
4123 int rc = -EINVAL;
4124 int size;
4125
4126 if (vc->vc_mode != KD_TEXT)
4127 return -EINVAL;
4128 if (!op->data)
4129 return -EINVAL;
4130 if (op->charcount > 512)
4131 return -EINVAL;
4132 if (!op->height) { /* Need to guess font height [compat] */
4133 int h, i;
4134 u8 __user *charmap = op->data;
4135 u8 tmp;
4136
4137 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4138 so that we can get rid of this soon */
4139 if (!(op->flags & KD_FONT_FLAG_OLD))
4140 return -EINVAL;
4141 for (h = 32; h > 0; h--)
4142 for (i = 0; i < op->charcount; i++) {
4143 if (get_user(tmp, &charmap[32*i+h-1]))
4144 return -EFAULT;
4145 if (tmp)
4146 goto nonzero;
4147 }
4148 return -EINVAL;
4149 nonzero:
4150 op->height = h;
4151 }
4152 if (op->width <= 0 || op->width > 32 || op->height > 32)
4153 return -EINVAL;
4154 size = (op->width+7)/8 * 32 * op->charcount;
4155 if (size > max_font_size)
4156 return -ENOSPC;
4157 font.charcount = op->charcount;
4158 font.height = op->height;
4159 font.width = op->width;
4160 font.data = memdup_user(op->data, size);
4161 if (IS_ERR(font.data))
4162 return PTR_ERR(font.data);
4163 console_lock();
4164 if (vc->vc_mode != KD_TEXT)
4165 rc = -EINVAL;
4166 else if (vc->vc_sw->con_font_set)
4167 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4168 else
4169 rc = -ENOSYS;
4170 console_unlock();
4171 kfree(font.data);
4172 return rc;
4173 }
4174
4175 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4176 {
4177 struct console_font font = {.width = op->width, .height = op->height};
4178 char name[MAX_FONT_NAME];
4179 char *s = name;
4180 int rc;
4181
4182
4183 if (!op->data)
4184 s = NULL;
4185 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4186 return -EFAULT;
4187 else
4188 name[MAX_FONT_NAME - 1] = 0;
4189
4190 console_lock();
4191 if (vc->vc_mode != KD_TEXT) {
4192 console_unlock();
4193 return -EINVAL;
4194 }
4195 if (vc->vc_sw->con_font_default)
4196 rc = vc->vc_sw->con_font_default(vc, &font, s);
4197 else
4198 rc = -ENOSYS;
4199 console_unlock();
4200 if (!rc) {
4201 op->width = font.width;
4202 op->height = font.height;
4203 }
4204 return rc;
4205 }
4206
4207 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4208 {
4209 int con = op->height;
4210 int rc;
4211
4212
4213 console_lock();
4214 if (vc->vc_mode != KD_TEXT)
4215 rc = -EINVAL;
4216 else if (!vc->vc_sw->con_font_copy)
4217 rc = -ENOSYS;
4218 else if (con < 0 || !vc_cons_allocated(con))
4219 rc = -ENOTTY;
4220 else if (con == vc->vc_num) /* nothing to do */
4221 rc = 0;
4222 else
4223 rc = vc->vc_sw->con_font_copy(vc, con);
4224 console_unlock();
4225 return rc;
4226 }
4227
4228 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4229 {
4230 switch (op->op) {
4231 case KD_FONT_OP_SET:
4232 return con_font_set(vc, op);
4233 case KD_FONT_OP_GET:
4234 return con_font_get(vc, op);
4235 case KD_FONT_OP_SET_DEFAULT:
4236 return con_font_default(vc, op);
4237 case KD_FONT_OP_COPY:
4238 return con_font_copy(vc, op);
4239 }
4240 return -ENOSYS;
4241 }
4242
4243 /*
4244 * Interface exported to selection and vcs.
4245 */
4246
4247 /* used by selection */
4248 u16 screen_glyph(struct vc_data *vc, int offset)
4249 {
4250 u16 w = scr_readw(screenpos(vc, offset, 1));
4251 u16 c = w & 0xff;
4252
4253 if (w & vc->vc_hi_font_mask)
4254 c |= 0x100;
4255 return c;
4256 }
4257 EXPORT_SYMBOL_GPL(screen_glyph);
4258
4259 /* used by vcs - note the word offset */
4260 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4261 {
4262 return screenpos(vc, 2 * w_offset, viewed);
4263 }
4264 EXPORT_SYMBOL_GPL(screen_pos);
4265
4266 void getconsxy(struct vc_data *vc, unsigned char *p)
4267 {
4268 p[0] = vc->vc_x;
4269 p[1] = vc->vc_y;
4270 }
4271
4272 void putconsxy(struct vc_data *vc, unsigned char *p)
4273 {
4274 hide_cursor(vc);
4275 gotoxy(vc, p[0], p[1]);
4276 set_cursor(vc);
4277 }
4278
4279 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4280 {
4281 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4282 return softcursor_original;
4283 return scr_readw(org);
4284 }
4285
4286 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4287 {
4288 scr_writew(val, org);
4289 if ((unsigned long)org == vc->vc_pos) {
4290 softcursor_original = -1;
4291 add_softcursor(vc);
4292 }
4293 }
4294
4295 void vcs_scr_updated(struct vc_data *vc)
4296 {
4297 notify_update(vc);
4298 }
4299
4300 /*
4301 * Visible symbols for modules
4302 */
4303
4304 EXPORT_SYMBOL(color_table);
4305 EXPORT_SYMBOL(default_red);
4306 EXPORT_SYMBOL(default_grn);
4307 EXPORT_SYMBOL(default_blu);
4308 EXPORT_SYMBOL(update_region);
4309 EXPORT_SYMBOL(redraw_screen);
4310 EXPORT_SYMBOL(vc_resize);
4311 EXPORT_SYMBOL(fg_console);
4312 EXPORT_SYMBOL(console_blank_hook);
4313 EXPORT_SYMBOL(console_blanked);
4314 EXPORT_SYMBOL(vc_cons);
4315 EXPORT_SYMBOL(global_cursor_default);
4316 #ifndef VT_SINGLE_DRIVER
4317 EXPORT_SYMBOL(give_up_console);
4318 #endif
Linux kernel - Deliverables
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