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Merge tag 'tegra-for-4.3-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-eoan-kernel.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;
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 inline 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 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
746 vc->vc_uni_pagedir = NULL;
747 vc->vc_hi_font_mask = 0;
748 vc->vc_complement_mask = 0;
749 vc->vc_can_do_color = 0;
750 vc->vc_panic_force_write = false;
751 vc->vc_sw->con_init(vc, init);
752 if (!vc->vc_complement_mask)
753 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
754 vc->vc_s_complement_mask = vc->vc_complement_mask;
755 vc->vc_size_row = vc->vc_cols << 1;
756 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
757 }
758
759 int vc_allocate(unsigned int currcons) /* return 0 on success */
760 {
761 WARN_CONSOLE_UNLOCKED();
762
763 if (currcons >= MAX_NR_CONSOLES)
764 return -ENXIO;
765 if (!vc_cons[currcons].d) {
766 struct vc_data *vc;
767 struct vt_notifier_param param;
768
769 /* prevent users from taking too much memory */
770 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
771 return -EPERM;
772
773 /* due to the granularity of kmalloc, we waste some memory here */
774 /* the alloc is done in two steps, to optimize the common situation
775 of a 25x80 console (structsize=216, screenbuf_size=4000) */
776 /* although the numbers above are not valid since long ago, the
777 point is still up-to-date and the comment still has its value
778 even if only as a historical artifact. --mj, July 1998 */
779 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
780 if (!vc)
781 return -ENOMEM;
782 vc_cons[currcons].d = vc;
783 tty_port_init(&vc->port);
784 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
785 visual_init(vc, currcons, 1);
786 if (!*vc->vc_uni_pagedir_loc)
787 con_set_default_unimap(vc);
788 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
789 if (!vc->vc_screenbuf) {
790 kfree(vc);
791 vc_cons[currcons].d = NULL;
792 return -ENOMEM;
793 }
794
795 /* If no drivers have overridden us and the user didn't pass a
796 boot option, default to displaying the cursor */
797 if (global_cursor_default == -1)
798 global_cursor_default = 1;
799
800 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
801 vcs_make_sysfs(currcons);
802 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
803 }
804 return 0;
805 }
806
807 static inline int resize_screen(struct vc_data *vc, int width, int height,
808 int user)
809 {
810 /* Resizes the resolution of the display adapater */
811 int err = 0;
812
813 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
814 err = vc->vc_sw->con_resize(vc, width, height, user);
815
816 return err;
817 }
818
819 /*
820 * Change # of rows and columns (0 means unchanged/the size of fg_console)
821 * [this is to be used together with some user program
822 * like resize that changes the hardware videomode]
823 */
824 #define VC_RESIZE_MAXCOL (32767)
825 #define VC_RESIZE_MAXROW (32767)
826
827 /**
828 * vc_do_resize - resizing method for the tty
829 * @tty: tty being resized
830 * @real_tty: real tty (different to tty if a pty/tty pair)
831 * @vc: virtual console private data
832 * @cols: columns
833 * @lines: lines
834 *
835 * Resize a virtual console, clipping according to the actual constraints.
836 * If the caller passes a tty structure then update the termios winsize
837 * information and perform any necessary signal handling.
838 *
839 * Caller must hold the console semaphore. Takes the termios rwsem and
840 * ctrl_lock of the tty IFF a tty is passed.
841 */
842
843 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
844 unsigned int cols, unsigned int lines)
845 {
846 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
847 unsigned long end;
848 unsigned int old_rows, old_row_size;
849 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
850 unsigned int user;
851 unsigned short *newscreen;
852
853 WARN_CONSOLE_UNLOCKED();
854
855 if (!vc)
856 return -ENXIO;
857
858 user = vc->vc_resize_user;
859 vc->vc_resize_user = 0;
860
861 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
862 return -EINVAL;
863
864 new_cols = (cols ? cols : vc->vc_cols);
865 new_rows = (lines ? lines : vc->vc_rows);
866 new_row_size = new_cols << 1;
867 new_screen_size = new_row_size * new_rows;
868
869 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
870 return 0;
871
872 newscreen = kmalloc(new_screen_size, GFP_USER);
873 if (!newscreen)
874 return -ENOMEM;
875
876 old_rows = vc->vc_rows;
877 old_row_size = vc->vc_size_row;
878
879 err = resize_screen(vc, new_cols, new_rows, user);
880 if (err) {
881 kfree(newscreen);
882 return err;
883 }
884
885 vc->vc_rows = new_rows;
886 vc->vc_cols = new_cols;
887 vc->vc_size_row = new_row_size;
888 vc->vc_screenbuf_size = new_screen_size;
889
890 rlth = min(old_row_size, new_row_size);
891 rrem = new_row_size - rlth;
892 old_origin = vc->vc_origin;
893 new_origin = (long) newscreen;
894 new_scr_end = new_origin + new_screen_size;
895
896 if (vc->vc_y > new_rows) {
897 if (old_rows - vc->vc_y < new_rows) {
898 /*
899 * Cursor near the bottom, copy contents from the
900 * bottom of buffer
901 */
902 old_origin += (old_rows - new_rows) * old_row_size;
903 } else {
904 /*
905 * Cursor is in no man's land, copy 1/2 screenful
906 * from the top and bottom of cursor position
907 */
908 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
909 }
910 }
911
912 end = old_origin + old_row_size * min(old_rows, new_rows);
913
914 update_attr(vc);
915
916 while (old_origin < end) {
917 scr_memcpyw((unsigned short *) new_origin,
918 (unsigned short *) old_origin, rlth);
919 if (rrem)
920 scr_memsetw((void *)(new_origin + rlth),
921 vc->vc_video_erase_char, rrem);
922 old_origin += old_row_size;
923 new_origin += new_row_size;
924 }
925 if (new_scr_end > new_origin)
926 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
927 new_scr_end - new_origin);
928 kfree(vc->vc_screenbuf);
929 vc->vc_screenbuf = newscreen;
930 vc->vc_screenbuf_size = new_screen_size;
931 set_origin(vc);
932
933 /* do part of a reset_terminal() */
934 vc->vc_top = 0;
935 vc->vc_bottom = vc->vc_rows;
936 gotoxy(vc, vc->vc_x, vc->vc_y);
937 save_cur(vc);
938
939 if (tty) {
940 /* Rewrite the requested winsize data with the actual
941 resulting sizes */
942 struct winsize ws;
943 memset(&ws, 0, sizeof(ws));
944 ws.ws_row = vc->vc_rows;
945 ws.ws_col = vc->vc_cols;
946 ws.ws_ypixel = vc->vc_scan_lines;
947 tty_do_resize(tty, &ws);
948 }
949
950 if (CON_IS_VISIBLE(vc))
951 update_screen(vc);
952 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
953 return err;
954 }
955
956 /**
957 * vc_resize - resize a VT
958 * @vc: virtual console
959 * @cols: columns
960 * @rows: rows
961 *
962 * Resize a virtual console as seen from the console end of things. We
963 * use the common vc_do_resize methods to update the structures. The
964 * caller must hold the console sem to protect console internals and
965 * vc->port.tty
966 */
967
968 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
969 {
970 return vc_do_resize(vc->port.tty, vc, cols, rows);
971 }
972
973 /**
974 * vt_resize - resize a VT
975 * @tty: tty to resize
976 * @ws: winsize attributes
977 *
978 * Resize a virtual terminal. This is called by the tty layer as we
979 * register our own handler for resizing. The mutual helper does all
980 * the actual work.
981 *
982 * Takes the console sem and the called methods then take the tty
983 * termios_rwsem and the tty ctrl_lock in that order.
984 */
985 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
986 {
987 struct vc_data *vc = tty->driver_data;
988 int ret;
989
990 console_lock();
991 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
992 console_unlock();
993 return ret;
994 }
995
996 struct vc_data *vc_deallocate(unsigned int currcons)
997 {
998 struct vc_data *vc = NULL;
999
1000 WARN_CONSOLE_UNLOCKED();
1001
1002 if (vc_cons_allocated(currcons)) {
1003 struct vt_notifier_param param;
1004
1005 param.vc = vc = vc_cons[currcons].d;
1006 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1007 vcs_remove_sysfs(currcons);
1008 vc->vc_sw->con_deinit(vc);
1009 put_pid(vc->vt_pid);
1010 module_put(vc->vc_sw->owner);
1011 kfree(vc->vc_screenbuf);
1012 vc_cons[currcons].d = NULL;
1013 }
1014 return vc;
1015 }
1016
1017 /*
1018 * VT102 emulator
1019 */
1020
1021 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
1022 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1023 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
1024
1025 #define decarm VC_REPEAT
1026 #define decckm VC_CKMODE
1027 #define kbdapplic VC_APPLIC
1028 #define lnm VC_CRLF
1029
1030 /*
1031 * this is what the terminal answers to a ESC-Z or csi0c query.
1032 */
1033 #define VT100ID "\033[?1;2c"
1034 #define VT102ID "\033[?6c"
1035
1036 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1037 8,12,10,14, 9,13,11,15 };
1038
1039 /* the default colour table, for VGA+ colour systems */
1040 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1041 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1042 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1043 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1044 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1045 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1046
1047 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1048 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1049 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1050
1051 /*
1052 * gotoxy() must verify all boundaries, because the arguments
1053 * might also be negative. If the given position is out of
1054 * bounds, the cursor is placed at the nearest margin.
1055 */
1056 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1057 {
1058 int min_y, max_y;
1059
1060 if (new_x < 0)
1061 vc->vc_x = 0;
1062 else {
1063 if (new_x >= vc->vc_cols)
1064 vc->vc_x = vc->vc_cols - 1;
1065 else
1066 vc->vc_x = new_x;
1067 }
1068
1069 if (vc->vc_decom) {
1070 min_y = vc->vc_top;
1071 max_y = vc->vc_bottom;
1072 } else {
1073 min_y = 0;
1074 max_y = vc->vc_rows;
1075 }
1076 if (new_y < min_y)
1077 vc->vc_y = min_y;
1078 else if (new_y >= max_y)
1079 vc->vc_y = max_y - 1;
1080 else
1081 vc->vc_y = new_y;
1082 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1083 vc->vc_need_wrap = 0;
1084 }
1085
1086 /* for absolute user moves, when decom is set */
1087 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1088 {
1089 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1090 }
1091
1092 void scrollback(struct vc_data *vc, int lines)
1093 {
1094 if (!lines)
1095 lines = vc->vc_rows / 2;
1096 scrolldelta(-lines);
1097 }
1098
1099 void scrollfront(struct vc_data *vc, int lines)
1100 {
1101 if (!lines)
1102 lines = vc->vc_rows / 2;
1103 scrolldelta(lines);
1104 }
1105
1106 static void lf(struct vc_data *vc)
1107 {
1108 /* don't scroll if above bottom of scrolling region, or
1109 * if below scrolling region
1110 */
1111 if (vc->vc_y + 1 == vc->vc_bottom)
1112 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1113 else if (vc->vc_y < vc->vc_rows - 1) {
1114 vc->vc_y++;
1115 vc->vc_pos += vc->vc_size_row;
1116 }
1117 vc->vc_need_wrap = 0;
1118 notify_write(vc, '\n');
1119 }
1120
1121 static void ri(struct vc_data *vc)
1122 {
1123 /* don't scroll if below top of scrolling region, or
1124 * if above scrolling region
1125 */
1126 if (vc->vc_y == vc->vc_top)
1127 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1128 else if (vc->vc_y > 0) {
1129 vc->vc_y--;
1130 vc->vc_pos -= vc->vc_size_row;
1131 }
1132 vc->vc_need_wrap = 0;
1133 }
1134
1135 static inline void cr(struct vc_data *vc)
1136 {
1137 vc->vc_pos -= vc->vc_x << 1;
1138 vc->vc_need_wrap = vc->vc_x = 0;
1139 notify_write(vc, '\r');
1140 }
1141
1142 static inline void bs(struct vc_data *vc)
1143 {
1144 if (vc->vc_x) {
1145 vc->vc_pos -= 2;
1146 vc->vc_x--;
1147 vc->vc_need_wrap = 0;
1148 notify_write(vc, '\b');
1149 }
1150 }
1151
1152 static inline void del(struct vc_data *vc)
1153 {
1154 /* ignored */
1155 }
1156
1157 static void csi_J(struct vc_data *vc, int vpar)
1158 {
1159 unsigned int count;
1160 unsigned short * start;
1161
1162 switch (vpar) {
1163 case 0: /* erase from cursor to end of display */
1164 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1165 start = (unsigned short *)vc->vc_pos;
1166 break;
1167 case 1: /* erase from start to cursor */
1168 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1169 start = (unsigned short *)vc->vc_origin;
1170 break;
1171 case 3: /* erase scroll-back buffer (and whole display) */
1172 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1173 vc->vc_screenbuf_size >> 1);
1174 set_origin(vc);
1175 if (CON_IS_VISIBLE(vc))
1176 update_screen(vc);
1177 /* fall through */
1178 case 2: /* erase whole display */
1179 count = vc->vc_cols * vc->vc_rows;
1180 start = (unsigned short *)vc->vc_origin;
1181 break;
1182 default:
1183 return;
1184 }
1185 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1186 if (DO_UPDATE(vc))
1187 do_update_region(vc, (unsigned long) start, count);
1188 vc->vc_need_wrap = 0;
1189 }
1190
1191 static void csi_K(struct vc_data *vc, int vpar)
1192 {
1193 unsigned int count;
1194 unsigned short * start;
1195
1196 switch (vpar) {
1197 case 0: /* erase from cursor to end of line */
1198 count = vc->vc_cols - vc->vc_x;
1199 start = (unsigned short *)vc->vc_pos;
1200 break;
1201 case 1: /* erase from start of line to cursor */
1202 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1203 count = vc->vc_x + 1;
1204 break;
1205 case 2: /* erase whole line */
1206 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1207 count = vc->vc_cols;
1208 break;
1209 default:
1210 return;
1211 }
1212 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1213 vc->vc_need_wrap = 0;
1214 if (DO_UPDATE(vc))
1215 do_update_region(vc, (unsigned long) start, count);
1216 }
1217
1218 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1219 { /* not vt100? */
1220 int count;
1221
1222 if (!vpar)
1223 vpar++;
1224 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1225
1226 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1227 if (DO_UPDATE(vc))
1228 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1229 vc->vc_need_wrap = 0;
1230 }
1231
1232 static void default_attr(struct vc_data *vc)
1233 {
1234 vc->vc_intensity = 1;
1235 vc->vc_italic = 0;
1236 vc->vc_underline = 0;
1237 vc->vc_reverse = 0;
1238 vc->vc_blink = 0;
1239 vc->vc_color = vc->vc_def_color;
1240 }
1241
1242 struct rgb { u8 r; u8 g; u8 b; };
1243
1244 static struct rgb rgb_from_256(int i)
1245 {
1246 struct rgb c;
1247 if (i < 8) { /* Standard colours. */
1248 c.r = i&1 ? 0xaa : 0x00;
1249 c.g = i&2 ? 0xaa : 0x00;
1250 c.b = i&4 ? 0xaa : 0x00;
1251 } else if (i < 16) {
1252 c.r = i&1 ? 0xff : 0x55;
1253 c.g = i&2 ? 0xff : 0x55;
1254 c.b = i&4 ? 0xff : 0x55;
1255 } else if (i < 232) { /* 6x6x6 colour cube. */
1256 c.r = (i - 16) / 36 * 85 / 2;
1257 c.g = (i - 16) / 6 % 6 * 85 / 2;
1258 c.b = (i - 16) % 6 * 85 / 2;
1259 } else /* Grayscale ramp. */
1260 c.r = c.g = c.b = i * 10 - 2312;
1261 return c;
1262 }
1263
1264 static void rgb_foreground(struct vc_data *vc, struct rgb c)
1265 {
1266 u8 hue, max = c.r;
1267 if (c.g > max)
1268 max = c.g;
1269 if (c.b > max)
1270 max = c.b;
1271 hue = (c.r > max/2 ? 4 : 0)
1272 | (c.g > max/2 ? 2 : 0)
1273 | (c.b > max/2 ? 1 : 0);
1274 if (hue == 7 && max <= 0x55)
1275 hue = 0, vc->vc_intensity = 2;
1276 else
1277 vc->vc_intensity = (max > 0xaa) + 1;
1278 vc->vc_color = (vc->vc_color & 0xf0) | hue;
1279 }
1280
1281 static void rgb_background(struct vc_data *vc, struct rgb c)
1282 {
1283 /* For backgrounds, err on the dark side. */
1284 vc->vc_color = (vc->vc_color & 0x0f)
1285 | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1286 }
1287
1288 /* console_lock is held */
1289 static void csi_m(struct vc_data *vc)
1290 {
1291 int i;
1292
1293 for (i = 0; i <= vc->vc_npar; i++)
1294 switch (vc->vc_par[i]) {
1295 case 0: /* all attributes off */
1296 default_attr(vc);
1297 break;
1298 case 1:
1299 vc->vc_intensity = 2;
1300 break;
1301 case 2:
1302 vc->vc_intensity = 0;
1303 break;
1304 case 3:
1305 vc->vc_italic = 1;
1306 break;
1307 case 4:
1308 vc->vc_underline = 1;
1309 break;
1310 case 5:
1311 vc->vc_blink = 1;
1312 break;
1313 case 7:
1314 vc->vc_reverse = 1;
1315 break;
1316 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1317 * Select primary font, don't display
1318 * control chars if defined, don't set
1319 * bit 8 on output.
1320 */
1321 vc->vc_translate = set_translate(vc->vc_charset == 0
1322 ? vc->vc_G0_charset
1323 : vc->vc_G1_charset, vc);
1324 vc->vc_disp_ctrl = 0;
1325 vc->vc_toggle_meta = 0;
1326 break;
1327 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1328 * Select first alternate font, lets
1329 * chars < 32 be displayed as ROM chars.
1330 */
1331 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1332 vc->vc_disp_ctrl = 1;
1333 vc->vc_toggle_meta = 0;
1334 break;
1335 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1336 * Select second alternate font, toggle
1337 * high bit before displaying as ROM char.
1338 */
1339 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1340 vc->vc_disp_ctrl = 1;
1341 vc->vc_toggle_meta = 1;
1342 break;
1343 case 21:
1344 case 22:
1345 vc->vc_intensity = 1;
1346 break;
1347 case 23:
1348 vc->vc_italic = 0;
1349 break;
1350 case 24:
1351 vc->vc_underline = 0;
1352 break;
1353 case 25:
1354 vc->vc_blink = 0;
1355 break;
1356 case 27:
1357 vc->vc_reverse = 0;
1358 break;
1359 case 38: /* ITU T.416
1360 * Higher colour modes.
1361 * They break the usual properties of SGR codes
1362 * and thus need to be detected and ignored by
1363 * hand. Strictly speaking, that standard also
1364 * wants : rather than ; as separators, contrary
1365 * to ECMA-48, but no one produces such codes
1366 * and almost no one accepts them.
1367 */
1368 i++;
1369 if (i > vc->vc_npar)
1370 break;
1371 if (vc->vc_par[i] == 5 && /* 256 colours */
1372 i < vc->vc_npar) { /* ubiquitous */
1373 i++;
1374 rgb_foreground(vc,
1375 rgb_from_256(vc->vc_par[i]));
1376 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1377 i <= vc->vc_npar + 3) {/* extremely rare */
1378 struct rgb c = {
1379 .r = vc->vc_par[i + 1],
1380 .g = vc->vc_par[i + 2],
1381 .b = vc->vc_par[i + 3],
1382 };
1383 rgb_foreground(vc, c);
1384 i += 3;
1385 }
1386 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1387 * there's no point in supporting them.
1388 */
1389 break;
1390 case 48:
1391 i++;
1392 if (i > vc->vc_npar)
1393 break;
1394 if (vc->vc_par[i] == 5 && /* 256 colours */
1395 i < vc->vc_npar) {
1396 i++;
1397 rgb_background(vc,
1398 rgb_from_256(vc->vc_par[i]));
1399 } else if (vc->vc_par[i] == 2 && /* 24 bit */
1400 i <= vc->vc_npar + 3) {
1401 struct rgb c = {
1402 .r = vc->vc_par[i + 1],
1403 .g = vc->vc_par[i + 2],
1404 .b = vc->vc_par[i + 3],
1405 };
1406 rgb_background(vc, c);
1407 i += 3;
1408 }
1409 break;
1410 case 39:
1411 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1412 break;
1413 case 49:
1414 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1415 break;
1416 default:
1417 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1418 vc->vc_color = color_table[vc->vc_par[i] - 30]
1419 | (vc->vc_color & 0xf0);
1420 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1421 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1422 | (vc->vc_color & 0x0f);
1423 break;
1424 }
1425 update_attr(vc);
1426 }
1427
1428 static void respond_string(const char *p, struct tty_port *port)
1429 {
1430 while (*p) {
1431 tty_insert_flip_char(port, *p, 0);
1432 p++;
1433 }
1434 tty_schedule_flip(port);
1435 }
1436
1437 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1438 {
1439 char buf[40];
1440
1441 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1442 respond_string(buf, tty->port);
1443 }
1444
1445 static inline void status_report(struct tty_struct *tty)
1446 {
1447 respond_string("\033[0n", tty->port); /* Terminal ok */
1448 }
1449
1450 static inline void respond_ID(struct tty_struct *tty)
1451 {
1452 respond_string(VT102ID, tty->port);
1453 }
1454
1455 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1456 {
1457 char buf[8];
1458
1459 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1460 (char)('!' + mry));
1461 respond_string(buf, tty->port);
1462 }
1463
1464 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1465 int mouse_reporting(void)
1466 {
1467 return vc_cons[fg_console].d->vc_report_mouse;
1468 }
1469
1470 /* console_lock is held */
1471 static void set_mode(struct vc_data *vc, int on_off)
1472 {
1473 int i;
1474
1475 for (i = 0; i <= vc->vc_npar; i++)
1476 if (vc->vc_ques) {
1477 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1478 case 1: /* Cursor keys send ^[Ox/^[[x */
1479 if (on_off)
1480 set_kbd(vc, decckm);
1481 else
1482 clr_kbd(vc, decckm);
1483 break;
1484 case 3: /* 80/132 mode switch unimplemented */
1485 vc->vc_deccolm = on_off;
1486 #if 0
1487 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1488 /* this alone does not suffice; some user mode
1489 utility has to change the hardware regs */
1490 #endif
1491 break;
1492 case 5: /* Inverted screen on/off */
1493 if (vc->vc_decscnm != on_off) {
1494 vc->vc_decscnm = on_off;
1495 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1496 update_attr(vc);
1497 }
1498 break;
1499 case 6: /* Origin relative/absolute */
1500 vc->vc_decom = on_off;
1501 gotoxay(vc, 0, 0);
1502 break;
1503 case 7: /* Autowrap on/off */
1504 vc->vc_decawm = on_off;
1505 break;
1506 case 8: /* Autorepeat on/off */
1507 if (on_off)
1508 set_kbd(vc, decarm);
1509 else
1510 clr_kbd(vc, decarm);
1511 break;
1512 case 9:
1513 vc->vc_report_mouse = on_off ? 1 : 0;
1514 break;
1515 case 25: /* Cursor on/off */
1516 vc->vc_deccm = on_off;
1517 break;
1518 case 1000:
1519 vc->vc_report_mouse = on_off ? 2 : 0;
1520 break;
1521 }
1522 } else {
1523 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1524 case 3: /* Monitor (display ctrls) */
1525 vc->vc_disp_ctrl = on_off;
1526 break;
1527 case 4: /* Insert Mode on/off */
1528 vc->vc_decim = on_off;
1529 break;
1530 case 20: /* Lf, Enter == CrLf/Lf */
1531 if (on_off)
1532 set_kbd(vc, lnm);
1533 else
1534 clr_kbd(vc, lnm);
1535 break;
1536 }
1537 }
1538 }
1539
1540 /* console_lock is held */
1541 static void setterm_command(struct vc_data *vc)
1542 {
1543 switch(vc->vc_par[0]) {
1544 case 1: /* set color for underline mode */
1545 if (vc->vc_can_do_color &&
1546 vc->vc_par[1] < 16) {
1547 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1548 if (vc->vc_underline)
1549 update_attr(vc);
1550 }
1551 break;
1552 case 2: /* set color for half intensity mode */
1553 if (vc->vc_can_do_color &&
1554 vc->vc_par[1] < 16) {
1555 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1556 if (vc->vc_intensity == 0)
1557 update_attr(vc);
1558 }
1559 break;
1560 case 8: /* store colors as defaults */
1561 vc->vc_def_color = vc->vc_attr;
1562 if (vc->vc_hi_font_mask == 0x100)
1563 vc->vc_def_color >>= 1;
1564 default_attr(vc);
1565 update_attr(vc);
1566 break;
1567 case 9: /* set blanking interval */
1568 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1569 poke_blanked_console();
1570 break;
1571 case 10: /* set bell frequency in Hz */
1572 if (vc->vc_npar >= 1)
1573 vc->vc_bell_pitch = vc->vc_par[1];
1574 else
1575 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1576 break;
1577 case 11: /* set bell duration in msec */
1578 if (vc->vc_npar >= 1)
1579 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1580 msecs_to_jiffies(vc->vc_par[1]) : 0;
1581 else
1582 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1583 break;
1584 case 12: /* bring specified console to the front */
1585 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1586 set_console(vc->vc_par[1] - 1);
1587 break;
1588 case 13: /* unblank the screen */
1589 poke_blanked_console();
1590 break;
1591 case 14: /* set vesa powerdown interval */
1592 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1593 break;
1594 case 15: /* activate the previous console */
1595 set_console(last_console);
1596 break;
1597 case 16: /* set cursor blink duration in msec */
1598 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1599 vc->vc_par[1] <= USHRT_MAX)
1600 vc->vc_cur_blink_ms = vc->vc_par[1];
1601 else
1602 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1603 break;
1604 }
1605 }
1606
1607 /* console_lock is held */
1608 static void csi_at(struct vc_data *vc, unsigned int nr)
1609 {
1610 if (nr > vc->vc_cols - vc->vc_x)
1611 nr = vc->vc_cols - vc->vc_x;
1612 else if (!nr)
1613 nr = 1;
1614 insert_char(vc, nr);
1615 }
1616
1617 /* console_lock is held */
1618 static void csi_L(struct vc_data *vc, unsigned int nr)
1619 {
1620 if (nr > vc->vc_rows - vc->vc_y)
1621 nr = vc->vc_rows - vc->vc_y;
1622 else if (!nr)
1623 nr = 1;
1624 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1625 vc->vc_need_wrap = 0;
1626 }
1627
1628 /* console_lock is held */
1629 static void csi_P(struct vc_data *vc, unsigned int nr)
1630 {
1631 if (nr > vc->vc_cols - vc->vc_x)
1632 nr = vc->vc_cols - vc->vc_x;
1633 else if (!nr)
1634 nr = 1;
1635 delete_char(vc, nr);
1636 }
1637
1638 /* console_lock is held */
1639 static void csi_M(struct vc_data *vc, unsigned int nr)
1640 {
1641 if (nr > vc->vc_rows - vc->vc_y)
1642 nr = vc->vc_rows - vc->vc_y;
1643 else if (!nr)
1644 nr=1;
1645 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1646 vc->vc_need_wrap = 0;
1647 }
1648
1649 /* console_lock is held (except via vc_init->reset_terminal */
1650 static void save_cur(struct vc_data *vc)
1651 {
1652 vc->vc_saved_x = vc->vc_x;
1653 vc->vc_saved_y = vc->vc_y;
1654 vc->vc_s_intensity = vc->vc_intensity;
1655 vc->vc_s_italic = vc->vc_italic;
1656 vc->vc_s_underline = vc->vc_underline;
1657 vc->vc_s_blink = vc->vc_blink;
1658 vc->vc_s_reverse = vc->vc_reverse;
1659 vc->vc_s_charset = vc->vc_charset;
1660 vc->vc_s_color = vc->vc_color;
1661 vc->vc_saved_G0 = vc->vc_G0_charset;
1662 vc->vc_saved_G1 = vc->vc_G1_charset;
1663 }
1664
1665 /* console_lock is held */
1666 static void restore_cur(struct vc_data *vc)
1667 {
1668 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1669 vc->vc_intensity = vc->vc_s_intensity;
1670 vc->vc_italic = vc->vc_s_italic;
1671 vc->vc_underline = vc->vc_s_underline;
1672 vc->vc_blink = vc->vc_s_blink;
1673 vc->vc_reverse = vc->vc_s_reverse;
1674 vc->vc_charset = vc->vc_s_charset;
1675 vc->vc_color = vc->vc_s_color;
1676 vc->vc_G0_charset = vc->vc_saved_G0;
1677 vc->vc_G1_charset = vc->vc_saved_G1;
1678 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1679 update_attr(vc);
1680 vc->vc_need_wrap = 0;
1681 }
1682
1683 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1684 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1685 ESpalette, ESosc };
1686
1687 /* console_lock is held (except via vc_init()) */
1688 static void reset_terminal(struct vc_data *vc, int do_clear)
1689 {
1690 vc->vc_top = 0;
1691 vc->vc_bottom = vc->vc_rows;
1692 vc->vc_state = ESnormal;
1693 vc->vc_ques = 0;
1694 vc->vc_translate = set_translate(LAT1_MAP, vc);
1695 vc->vc_G0_charset = LAT1_MAP;
1696 vc->vc_G1_charset = GRAF_MAP;
1697 vc->vc_charset = 0;
1698 vc->vc_need_wrap = 0;
1699 vc->vc_report_mouse = 0;
1700 vc->vc_utf = default_utf8;
1701 vc->vc_utf_count = 0;
1702
1703 vc->vc_disp_ctrl = 0;
1704 vc->vc_toggle_meta = 0;
1705
1706 vc->vc_decscnm = 0;
1707 vc->vc_decom = 0;
1708 vc->vc_decawm = 1;
1709 vc->vc_deccm = global_cursor_default;
1710 vc->vc_decim = 0;
1711
1712 vt_reset_keyboard(vc->vc_num);
1713
1714 vc->vc_cursor_type = cur_default;
1715 vc->vc_complement_mask = vc->vc_s_complement_mask;
1716
1717 default_attr(vc);
1718 update_attr(vc);
1719
1720 vc->vc_tab_stop[0] = 0x01010100;
1721 vc->vc_tab_stop[1] =
1722 vc->vc_tab_stop[2] =
1723 vc->vc_tab_stop[3] =
1724 vc->vc_tab_stop[4] =
1725 vc->vc_tab_stop[5] =
1726 vc->vc_tab_stop[6] =
1727 vc->vc_tab_stop[7] = 0x01010101;
1728
1729 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1730 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1731 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1732
1733 gotoxy(vc, 0, 0);
1734 save_cur(vc);
1735 if (do_clear)
1736 csi_J(vc, 2);
1737 }
1738
1739 /* console_lock is held */
1740 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1741 {
1742 /*
1743 * Control characters can be used in the _middle_
1744 * of an escape sequence.
1745 */
1746 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1747 return;
1748 switch (c) {
1749 case 0:
1750 return;
1751 case 7:
1752 if (vc->vc_state == ESosc)
1753 vc->vc_state = ESnormal;
1754 else if (vc->vc_bell_duration)
1755 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1756 return;
1757 case 8:
1758 bs(vc);
1759 return;
1760 case 9:
1761 vc->vc_pos -= (vc->vc_x << 1);
1762 while (vc->vc_x < vc->vc_cols - 1) {
1763 vc->vc_x++;
1764 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1765 break;
1766 }
1767 vc->vc_pos += (vc->vc_x << 1);
1768 notify_write(vc, '\t');
1769 return;
1770 case 10: case 11: case 12:
1771 lf(vc);
1772 if (!is_kbd(vc, lnm))
1773 return;
1774 case 13:
1775 cr(vc);
1776 return;
1777 case 14:
1778 vc->vc_charset = 1;
1779 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1780 vc->vc_disp_ctrl = 1;
1781 return;
1782 case 15:
1783 vc->vc_charset = 0;
1784 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1785 vc->vc_disp_ctrl = 0;
1786 return;
1787 case 24: case 26:
1788 vc->vc_state = ESnormal;
1789 return;
1790 case 27:
1791 vc->vc_state = ESesc;
1792 return;
1793 case 127:
1794 del(vc);
1795 return;
1796 case 128+27:
1797 vc->vc_state = ESsquare;
1798 return;
1799 }
1800 switch(vc->vc_state) {
1801 case ESesc:
1802 vc->vc_state = ESnormal;
1803 switch (c) {
1804 case '[':
1805 vc->vc_state = ESsquare;
1806 return;
1807 case ']':
1808 vc->vc_state = ESnonstd;
1809 return;
1810 case '%':
1811 vc->vc_state = ESpercent;
1812 return;
1813 case 'E':
1814 cr(vc);
1815 lf(vc);
1816 return;
1817 case 'M':
1818 ri(vc);
1819 return;
1820 case 'D':
1821 lf(vc);
1822 return;
1823 case 'H':
1824 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1825 return;
1826 case 'Z':
1827 respond_ID(tty);
1828 return;
1829 case '7':
1830 save_cur(vc);
1831 return;
1832 case '8':
1833 restore_cur(vc);
1834 return;
1835 case '(':
1836 vc->vc_state = ESsetG0;
1837 return;
1838 case ')':
1839 vc->vc_state = ESsetG1;
1840 return;
1841 case '#':
1842 vc->vc_state = EShash;
1843 return;
1844 case 'c':
1845 reset_terminal(vc, 1);
1846 return;
1847 case '>': /* Numeric keypad */
1848 clr_kbd(vc, kbdapplic);
1849 return;
1850 case '=': /* Appl. keypad */
1851 set_kbd(vc, kbdapplic);
1852 return;
1853 }
1854 return;
1855 case ESnonstd:
1856 if (c=='P') { /* palette escape sequence */
1857 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1858 vc->vc_par[vc->vc_npar] = 0;
1859 vc->vc_npar = 0;
1860 vc->vc_state = ESpalette;
1861 return;
1862 } else if (c=='R') { /* reset palette */
1863 reset_palette(vc);
1864 vc->vc_state = ESnormal;
1865 } else if (c>='0' && c<='9')
1866 vc->vc_state = ESosc;
1867 else
1868 vc->vc_state = ESnormal;
1869 return;
1870 case ESpalette:
1871 if (isxdigit(c)) {
1872 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1873 if (vc->vc_npar == 7) {
1874 int i = vc->vc_par[0] * 3, j = 1;
1875 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1876 vc->vc_palette[i++] += vc->vc_par[j++];
1877 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1878 vc->vc_palette[i++] += vc->vc_par[j++];
1879 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1880 vc->vc_palette[i] += vc->vc_par[j];
1881 set_palette(vc);
1882 vc->vc_state = ESnormal;
1883 }
1884 } else
1885 vc->vc_state = ESnormal;
1886 return;
1887 case ESsquare:
1888 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1889 vc->vc_par[vc->vc_npar] = 0;
1890 vc->vc_npar = 0;
1891 vc->vc_state = ESgetpars;
1892 if (c == '[') { /* Function key */
1893 vc->vc_state=ESfunckey;
1894 return;
1895 }
1896 vc->vc_ques = (c == '?');
1897 if (vc->vc_ques)
1898 return;
1899 case ESgetpars:
1900 if (c == ';' && vc->vc_npar < NPAR - 1) {
1901 vc->vc_npar++;
1902 return;
1903 } else if (c>='0' && c<='9') {
1904 vc->vc_par[vc->vc_npar] *= 10;
1905 vc->vc_par[vc->vc_npar] += c - '0';
1906 return;
1907 }
1908 vc->vc_state = ESnormal;
1909 switch(c) {
1910 case 'h':
1911 set_mode(vc, 1);
1912 return;
1913 case 'l':
1914 set_mode(vc, 0);
1915 return;
1916 case 'c':
1917 if (vc->vc_ques) {
1918 if (vc->vc_par[0])
1919 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1920 else
1921 vc->vc_cursor_type = cur_default;
1922 return;
1923 }
1924 break;
1925 case 'm':
1926 if (vc->vc_ques) {
1927 clear_selection();
1928 if (vc->vc_par[0])
1929 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1930 else
1931 vc->vc_complement_mask = vc->vc_s_complement_mask;
1932 return;
1933 }
1934 break;
1935 case 'n':
1936 if (!vc->vc_ques) {
1937 if (vc->vc_par[0] == 5)
1938 status_report(tty);
1939 else if (vc->vc_par[0] == 6)
1940 cursor_report(vc, tty);
1941 }
1942 return;
1943 }
1944 if (vc->vc_ques) {
1945 vc->vc_ques = 0;
1946 return;
1947 }
1948 switch(c) {
1949 case 'G': case '`':
1950 if (vc->vc_par[0])
1951 vc->vc_par[0]--;
1952 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1953 return;
1954 case 'A':
1955 if (!vc->vc_par[0])
1956 vc->vc_par[0]++;
1957 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1958 return;
1959 case 'B': case 'e':
1960 if (!vc->vc_par[0])
1961 vc->vc_par[0]++;
1962 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1963 return;
1964 case 'C': case 'a':
1965 if (!vc->vc_par[0])
1966 vc->vc_par[0]++;
1967 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1968 return;
1969 case 'D':
1970 if (!vc->vc_par[0])
1971 vc->vc_par[0]++;
1972 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1973 return;
1974 case 'E':
1975 if (!vc->vc_par[0])
1976 vc->vc_par[0]++;
1977 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1978 return;
1979 case 'F':
1980 if (!vc->vc_par[0])
1981 vc->vc_par[0]++;
1982 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1983 return;
1984 case 'd':
1985 if (vc->vc_par[0])
1986 vc->vc_par[0]--;
1987 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1988 return;
1989 case 'H': case 'f':
1990 if (vc->vc_par[0])
1991 vc->vc_par[0]--;
1992 if (vc->vc_par[1])
1993 vc->vc_par[1]--;
1994 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1995 return;
1996 case 'J':
1997 csi_J(vc, vc->vc_par[0]);
1998 return;
1999 case 'K':
2000 csi_K(vc, vc->vc_par[0]);
2001 return;
2002 case 'L':
2003 csi_L(vc, vc->vc_par[0]);
2004 return;
2005 case 'M':
2006 csi_M(vc, vc->vc_par[0]);
2007 return;
2008 case 'P':
2009 csi_P(vc, vc->vc_par[0]);
2010 return;
2011 case 'c':
2012 if (!vc->vc_par[0])
2013 respond_ID(tty);
2014 return;
2015 case 'g':
2016 if (!vc->vc_par[0])
2017 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2018 else if (vc->vc_par[0] == 3) {
2019 vc->vc_tab_stop[0] =
2020 vc->vc_tab_stop[1] =
2021 vc->vc_tab_stop[2] =
2022 vc->vc_tab_stop[3] =
2023 vc->vc_tab_stop[4] =
2024 vc->vc_tab_stop[5] =
2025 vc->vc_tab_stop[6] =
2026 vc->vc_tab_stop[7] = 0;
2027 }
2028 return;
2029 case 'm':
2030 csi_m(vc);
2031 return;
2032 case 'q': /* DECLL - but only 3 leds */
2033 /* map 0,1,2,3 to 0,1,2,4 */
2034 if (vc->vc_par[0] < 4)
2035 vt_set_led_state(vc->vc_num,
2036 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2037 return;
2038 case 'r':
2039 if (!vc->vc_par[0])
2040 vc->vc_par[0]++;
2041 if (!vc->vc_par[1])
2042 vc->vc_par[1] = vc->vc_rows;
2043 /* Minimum allowed region is 2 lines */
2044 if (vc->vc_par[0] < vc->vc_par[1] &&
2045 vc->vc_par[1] <= vc->vc_rows) {
2046 vc->vc_top = vc->vc_par[0] - 1;
2047 vc->vc_bottom = vc->vc_par[1];
2048 gotoxay(vc, 0, 0);
2049 }
2050 return;
2051 case 's':
2052 save_cur(vc);
2053 return;
2054 case 'u':
2055 restore_cur(vc);
2056 return;
2057 case 'X':
2058 csi_X(vc, vc->vc_par[0]);
2059 return;
2060 case '@':
2061 csi_at(vc, vc->vc_par[0]);
2062 return;
2063 case ']': /* setterm functions */
2064 setterm_command(vc);
2065 return;
2066 }
2067 return;
2068 case ESpercent:
2069 vc->vc_state = ESnormal;
2070 switch (c) {
2071 case '@': /* defined in ISO 2022 */
2072 vc->vc_utf = 0;
2073 return;
2074 case 'G': /* prelim official escape code */
2075 case '8': /* retained for compatibility */
2076 vc->vc_utf = 1;
2077 return;
2078 }
2079 return;
2080 case ESfunckey:
2081 vc->vc_state = ESnormal;
2082 return;
2083 case EShash:
2084 vc->vc_state = ESnormal;
2085 if (c == '8') {
2086 /* DEC screen alignment test. kludge :-) */
2087 vc->vc_video_erase_char =
2088 (vc->vc_video_erase_char & 0xff00) | 'E';
2089 csi_J(vc, 2);
2090 vc->vc_video_erase_char =
2091 (vc->vc_video_erase_char & 0xff00) | ' ';
2092 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2093 }
2094 return;
2095 case ESsetG0:
2096 if (c == '0')
2097 vc->vc_G0_charset = GRAF_MAP;
2098 else if (c == 'B')
2099 vc->vc_G0_charset = LAT1_MAP;
2100 else if (c == 'U')
2101 vc->vc_G0_charset = IBMPC_MAP;
2102 else if (c == 'K')
2103 vc->vc_G0_charset = USER_MAP;
2104 if (vc->vc_charset == 0)
2105 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2106 vc->vc_state = ESnormal;
2107 return;
2108 case ESsetG1:
2109 if (c == '0')
2110 vc->vc_G1_charset = GRAF_MAP;
2111 else if (c == 'B')
2112 vc->vc_G1_charset = LAT1_MAP;
2113 else if (c == 'U')
2114 vc->vc_G1_charset = IBMPC_MAP;
2115 else if (c == 'K')
2116 vc->vc_G1_charset = USER_MAP;
2117 if (vc->vc_charset == 1)
2118 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2119 vc->vc_state = ESnormal;
2120 return;
2121 case ESosc:
2122 return;
2123 default:
2124 vc->vc_state = ESnormal;
2125 }
2126 }
2127
2128 /* is_double_width() is based on the wcwidth() implementation by
2129 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2130 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2131 */
2132 struct interval {
2133 uint32_t first;
2134 uint32_t last;
2135 };
2136
2137 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2138 {
2139 int min = 0;
2140 int mid;
2141
2142 if (ucs < table[0].first || ucs > table[max].last)
2143 return 0;
2144 while (max >= min) {
2145 mid = (min + max) / 2;
2146 if (ucs > table[mid].last)
2147 min = mid + 1;
2148 else if (ucs < table[mid].first)
2149 max = mid - 1;
2150 else
2151 return 1;
2152 }
2153 return 0;
2154 }
2155
2156 static int is_double_width(uint32_t ucs)
2157 {
2158 static const struct interval double_width[] = {
2159 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2160 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2161 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2162 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2163 };
2164 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2165 }
2166
2167 /* acquires console_lock */
2168 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2169 {
2170 #ifdef VT_BUF_VRAM_ONLY
2171 #define FLUSH do { } while(0);
2172 #else
2173 #define FLUSH if (draw_x >= 0) { \
2174 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2175 draw_x = -1; \
2176 }
2177 #endif
2178
2179 int c, tc, ok, n = 0, draw_x = -1;
2180 unsigned int currcons;
2181 unsigned long draw_from = 0, draw_to = 0;
2182 struct vc_data *vc;
2183 unsigned char vc_attr;
2184 struct vt_notifier_param param;
2185 uint8_t rescan;
2186 uint8_t inverse;
2187 uint8_t width;
2188 u16 himask, charmask;
2189
2190 if (in_interrupt())
2191 return count;
2192
2193 might_sleep();
2194
2195 console_lock();
2196 vc = tty->driver_data;
2197 if (vc == NULL) {
2198 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2199 console_unlock();
2200 return 0;
2201 }
2202
2203 currcons = vc->vc_num;
2204 if (!vc_cons_allocated(currcons)) {
2205 /* could this happen? */
2206 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2207 console_unlock();
2208 return 0;
2209 }
2210
2211 himask = vc->vc_hi_font_mask;
2212 charmask = himask ? 0x1ff : 0xff;
2213
2214 /* undraw cursor first */
2215 if (IS_FG(vc))
2216 hide_cursor(vc);
2217
2218 param.vc = vc;
2219
2220 while (!tty->stopped && count) {
2221 int orig = *buf;
2222 c = orig;
2223 buf++;
2224 n++;
2225 count--;
2226 rescan = 0;
2227 inverse = 0;
2228 width = 1;
2229
2230 /* Do no translation at all in control states */
2231 if (vc->vc_state != ESnormal) {
2232 tc = c;
2233 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2234 /* Combine UTF-8 into Unicode in vc_utf_char.
2235 * vc_utf_count is the number of continuation bytes still
2236 * expected to arrive.
2237 * vc_npar is the number of continuation bytes arrived so
2238 * far
2239 */
2240 rescan_last_byte:
2241 if ((c & 0xc0) == 0x80) {
2242 /* Continuation byte received */
2243 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2244 if (vc->vc_utf_count) {
2245 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2246 vc->vc_npar++;
2247 if (--vc->vc_utf_count) {
2248 /* Still need some bytes */
2249 continue;
2250 }
2251 /* Got a whole character */
2252 c = vc->vc_utf_char;
2253 /* Reject overlong sequences */
2254 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2255 c > utf8_length_changes[vc->vc_npar])
2256 c = 0xfffd;
2257 } else {
2258 /* Unexpected continuation byte */
2259 vc->vc_utf_count = 0;
2260 c = 0xfffd;
2261 }
2262 } else {
2263 /* Single ASCII byte or first byte of a sequence received */
2264 if (vc->vc_utf_count) {
2265 /* Continuation byte expected */
2266 rescan = 1;
2267 vc->vc_utf_count = 0;
2268 c = 0xfffd;
2269 } else if (c > 0x7f) {
2270 /* First byte of a multibyte sequence received */
2271 vc->vc_npar = 0;
2272 if ((c & 0xe0) == 0xc0) {
2273 vc->vc_utf_count = 1;
2274 vc->vc_utf_char = (c & 0x1f);
2275 } else if ((c & 0xf0) == 0xe0) {
2276 vc->vc_utf_count = 2;
2277 vc->vc_utf_char = (c & 0x0f);
2278 } else if ((c & 0xf8) == 0xf0) {
2279 vc->vc_utf_count = 3;
2280 vc->vc_utf_char = (c & 0x07);
2281 } else if ((c & 0xfc) == 0xf8) {
2282 vc->vc_utf_count = 4;
2283 vc->vc_utf_char = (c & 0x03);
2284 } else if ((c & 0xfe) == 0xfc) {
2285 vc->vc_utf_count = 5;
2286 vc->vc_utf_char = (c & 0x01);
2287 } else {
2288 /* 254 and 255 are invalid */
2289 c = 0xfffd;
2290 }
2291 if (vc->vc_utf_count) {
2292 /* Still need some bytes */
2293 continue;
2294 }
2295 }
2296 /* Nothing to do if an ASCII byte was received */
2297 }
2298 /* End of UTF-8 decoding. */
2299 /* c is the received character, or U+FFFD for invalid sequences. */
2300 /* Replace invalid Unicode code points with U+FFFD too */
2301 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2302 c = 0xfffd;
2303 tc = c;
2304 } else { /* no utf or alternate charset mode */
2305 tc = vc_translate(vc, c);
2306 }
2307
2308 param.c = tc;
2309 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2310 &param) == NOTIFY_STOP)
2311 continue;
2312
2313 /* If the original code was a control character we
2314 * only allow a glyph to be displayed if the code is
2315 * not normally used (such as for cursor movement) or
2316 * if the disp_ctrl mode has been explicitly enabled.
2317 * Certain characters (as given by the CTRL_ALWAYS
2318 * bitmap) are always displayed as control characters,
2319 * as the console would be pretty useless without
2320 * them; to display an arbitrary font position use the
2321 * direct-to-font zone in UTF-8 mode.
2322 */
2323 ok = tc && (c >= 32 ||
2324 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2325 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2326 && (c != 127 || vc->vc_disp_ctrl)
2327 && (c != 128+27);
2328
2329 if (vc->vc_state == ESnormal && ok) {
2330 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2331 if (is_double_width(c))
2332 width = 2;
2333 }
2334 /* Now try to find out how to display it */
2335 tc = conv_uni_to_pc(vc, tc);
2336 if (tc & ~charmask) {
2337 if (tc == -1 || tc == -2) {
2338 continue; /* nothing to display */
2339 }
2340 /* Glyph not found */
2341 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2342 /* In legacy mode use the glyph we get by a 1:1 mapping.
2343 This would make absolutely no sense with Unicode in mind,
2344 but do this for ASCII characters since a font may lack
2345 Unicode mapping info and we don't want to end up with
2346 having question marks only. */
2347 tc = c;
2348 } else {
2349 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2350 tc = conv_uni_to_pc(vc, 0xfffd);
2351 if (tc < 0) {
2352 inverse = 1;
2353 tc = conv_uni_to_pc(vc, '?');
2354 if (tc < 0) tc = '?';
2355 }
2356 }
2357 }
2358
2359 if (!inverse) {
2360 vc_attr = vc->vc_attr;
2361 } else {
2362 /* invert vc_attr */
2363 if (!vc->vc_can_do_color) {
2364 vc_attr = (vc->vc_attr) ^ 0x08;
2365 } else if (vc->vc_hi_font_mask == 0x100) {
2366 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2367 } else {
2368 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2369 }
2370 FLUSH
2371 }
2372
2373 while (1) {
2374 if (vc->vc_need_wrap || vc->vc_decim)
2375 FLUSH
2376 if (vc->vc_need_wrap) {
2377 cr(vc);
2378 lf(vc);
2379 }
2380 if (vc->vc_decim)
2381 insert_char(vc, 1);
2382 scr_writew(himask ?
2383 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2384 (vc_attr << 8) + tc,
2385 (u16 *) vc->vc_pos);
2386 if (DO_UPDATE(vc) && draw_x < 0) {
2387 draw_x = vc->vc_x;
2388 draw_from = vc->vc_pos;
2389 }
2390 if (vc->vc_x == vc->vc_cols - 1) {
2391 vc->vc_need_wrap = vc->vc_decawm;
2392 draw_to = vc->vc_pos + 2;
2393 } else {
2394 vc->vc_x++;
2395 draw_to = (vc->vc_pos += 2);
2396 }
2397
2398 if (!--width) break;
2399
2400 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2401 if (tc < 0) tc = ' ';
2402 }
2403 notify_write(vc, c);
2404
2405 if (inverse) {
2406 FLUSH
2407 }
2408
2409 if (rescan) {
2410 rescan = 0;
2411 inverse = 0;
2412 width = 1;
2413 c = orig;
2414 goto rescan_last_byte;
2415 }
2416 continue;
2417 }
2418 FLUSH
2419 do_con_trol(tty, vc, orig);
2420 }
2421 FLUSH
2422 console_conditional_schedule();
2423 console_unlock();
2424 notify_update(vc);
2425 return n;
2426 #undef FLUSH
2427 }
2428
2429 /*
2430 * This is the console switching callback.
2431 *
2432 * Doing console switching in a process context allows
2433 * us to do the switches asynchronously (needed when we want
2434 * to switch due to a keyboard interrupt). Synchronization
2435 * with other console code and prevention of re-entrancy is
2436 * ensured with console_lock.
2437 */
2438 static void console_callback(struct work_struct *ignored)
2439 {
2440 console_lock();
2441
2442 if (want_console >= 0) {
2443 if (want_console != fg_console &&
2444 vc_cons_allocated(want_console)) {
2445 hide_cursor(vc_cons[fg_console].d);
2446 change_console(vc_cons[want_console].d);
2447 /* we only changed when the console had already
2448 been allocated - a new console is not created
2449 in an interrupt routine */
2450 }
2451 want_console = -1;
2452 }
2453 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2454 do_poke_blanked_console = 0;
2455 poke_blanked_console();
2456 }
2457 if (scrollback_delta) {
2458 struct vc_data *vc = vc_cons[fg_console].d;
2459 clear_selection();
2460 if (vc->vc_mode == KD_TEXT)
2461 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2462 scrollback_delta = 0;
2463 }
2464 if (blank_timer_expired) {
2465 do_blank_screen(0);
2466 blank_timer_expired = 0;
2467 }
2468 notify_update(vc_cons[fg_console].d);
2469
2470 console_unlock();
2471 }
2472
2473 int set_console(int nr)
2474 {
2475 struct vc_data *vc = vc_cons[fg_console].d;
2476
2477 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2478 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2479
2480 /*
2481 * Console switch will fail in console_callback() or
2482 * change_console() so there is no point scheduling
2483 * the callback
2484 *
2485 * Existing set_console() users don't check the return
2486 * value so this shouldn't break anything
2487 */
2488 return -EINVAL;
2489 }
2490
2491 want_console = nr;
2492 schedule_console_callback();
2493
2494 return 0;
2495 }
2496
2497 struct tty_driver *console_driver;
2498
2499 #ifdef CONFIG_VT_CONSOLE
2500
2501 /**
2502 * vt_kmsg_redirect() - Sets/gets the kernel message console
2503 * @new: The new virtual terminal number or -1 if the console should stay
2504 * unchanged
2505 *
2506 * By default, the kernel messages are always printed on the current virtual
2507 * console. However, the user may modify that default with the
2508 * TIOCL_SETKMSGREDIRECT ioctl call.
2509 *
2510 * This function sets the kernel message console to be @new. It returns the old
2511 * virtual console number. The virtual terminal number 0 (both as parameter and
2512 * return value) means no redirection (i.e. always printed on the currently
2513 * active console).
2514 *
2515 * The parameter -1 means that only the current console is returned, but the
2516 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2517 * case to make the code more understandable.
2518 *
2519 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2520 * the parameter and always returns 0.
2521 */
2522 int vt_kmsg_redirect(int new)
2523 {
2524 static int kmsg_con;
2525
2526 if (new != -1)
2527 return xchg(&kmsg_con, new);
2528 else
2529 return kmsg_con;
2530 }
2531
2532 /*
2533 * Console on virtual terminal
2534 *
2535 * The console must be locked when we get here.
2536 */
2537
2538 static void vt_console_print(struct console *co, const char *b, unsigned count)
2539 {
2540 struct vc_data *vc = vc_cons[fg_console].d;
2541 unsigned char c;
2542 static DEFINE_SPINLOCK(printing_lock);
2543 const ushort *start;
2544 ushort cnt = 0;
2545 ushort myx;
2546 int kmsg_console;
2547
2548 /* console busy or not yet initialized */
2549 if (!printable)
2550 return;
2551 if (!spin_trylock(&printing_lock))
2552 return;
2553
2554 kmsg_console = vt_get_kmsg_redirect();
2555 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2556 vc = vc_cons[kmsg_console - 1].d;
2557
2558 /* read `x' only after setting currcons properly (otherwise
2559 the `x' macro will read the x of the foreground console). */
2560 myx = vc->vc_x;
2561
2562 if (!vc_cons_allocated(fg_console)) {
2563 /* impossible */
2564 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2565 goto quit;
2566 }
2567
2568 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2569 goto quit;
2570
2571 /* undraw cursor first */
2572 if (IS_FG(vc))
2573 hide_cursor(vc);
2574
2575 start = (ushort *)vc->vc_pos;
2576
2577 /* Contrived structure to try to emulate original need_wrap behaviour
2578 * Problems caused when we have need_wrap set on '\n' character */
2579 while (count--) {
2580 c = *b++;
2581 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2582 if (cnt > 0) {
2583 if (CON_IS_VISIBLE(vc))
2584 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2585 vc->vc_x += cnt;
2586 if (vc->vc_need_wrap)
2587 vc->vc_x--;
2588 cnt = 0;
2589 }
2590 if (c == 8) { /* backspace */
2591 bs(vc);
2592 start = (ushort *)vc->vc_pos;
2593 myx = vc->vc_x;
2594 continue;
2595 }
2596 if (c != 13)
2597 lf(vc);
2598 cr(vc);
2599 start = (ushort *)vc->vc_pos;
2600 myx = vc->vc_x;
2601 if (c == 10 || c == 13)
2602 continue;
2603 }
2604 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2605 notify_write(vc, c);
2606 cnt++;
2607 if (myx == vc->vc_cols - 1) {
2608 vc->vc_need_wrap = 1;
2609 continue;
2610 }
2611 vc->vc_pos += 2;
2612 myx++;
2613 }
2614 if (cnt > 0) {
2615 if (CON_IS_VISIBLE(vc))
2616 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2617 vc->vc_x += cnt;
2618 if (vc->vc_x == vc->vc_cols) {
2619 vc->vc_x--;
2620 vc->vc_need_wrap = 1;
2621 }
2622 }
2623 set_cursor(vc);
2624 notify_update(vc);
2625
2626 quit:
2627 spin_unlock(&printing_lock);
2628 }
2629
2630 static struct tty_driver *vt_console_device(struct console *c, int *index)
2631 {
2632 *index = c->index ? c->index-1 : fg_console;
2633 return console_driver;
2634 }
2635
2636 static struct console vt_console_driver = {
2637 .name = "tty",
2638 .write = vt_console_print,
2639 .device = vt_console_device,
2640 .unblank = unblank_screen,
2641 .flags = CON_PRINTBUFFER,
2642 .index = -1,
2643 };
2644 #endif
2645
2646 /*
2647 * Handling of Linux-specific VC ioctls
2648 */
2649
2650 /*
2651 * Generally a bit racy with respect to console_lock();.
2652 *
2653 * There are some functions which don't need it.
2654 *
2655 * There are some functions which can sleep for arbitrary periods
2656 * (paste_selection) but we don't need the lock there anyway.
2657 *
2658 * set_selection has locking, and definitely needs it
2659 */
2660
2661 int tioclinux(struct tty_struct *tty, unsigned long arg)
2662 {
2663 char type, data;
2664 char __user *p = (char __user *)arg;
2665 int lines;
2666 int ret;
2667
2668 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2669 return -EPERM;
2670 if (get_user(type, p))
2671 return -EFAULT;
2672 ret = 0;
2673
2674 switch (type)
2675 {
2676 case TIOCL_SETSEL:
2677 console_lock();
2678 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2679 console_unlock();
2680 break;
2681 case TIOCL_PASTESEL:
2682 ret = paste_selection(tty);
2683 break;
2684 case TIOCL_UNBLANKSCREEN:
2685 console_lock();
2686 unblank_screen();
2687 console_unlock();
2688 break;
2689 case TIOCL_SELLOADLUT:
2690 console_lock();
2691 ret = sel_loadlut(p);
2692 console_unlock();
2693 break;
2694 case TIOCL_GETSHIFTSTATE:
2695
2696 /*
2697 * Make it possible to react to Shift+Mousebutton.
2698 * Note that 'shift_state' is an undocumented
2699 * kernel-internal variable; programs not closely
2700 * related to the kernel should not use this.
2701 */
2702 data = vt_get_shift_state();
2703 ret = __put_user(data, p);
2704 break;
2705 case TIOCL_GETMOUSEREPORTING:
2706 console_lock(); /* May be overkill */
2707 data = mouse_reporting();
2708 console_unlock();
2709 ret = __put_user(data, p);
2710 break;
2711 case TIOCL_SETVESABLANK:
2712 console_lock();
2713 ret = set_vesa_blanking(p);
2714 console_unlock();
2715 break;
2716 case TIOCL_GETKMSGREDIRECT:
2717 data = vt_get_kmsg_redirect();
2718 ret = __put_user(data, p);
2719 break;
2720 case TIOCL_SETKMSGREDIRECT:
2721 if (!capable(CAP_SYS_ADMIN)) {
2722 ret = -EPERM;
2723 } else {
2724 if (get_user(data, p+1))
2725 ret = -EFAULT;
2726 else
2727 vt_kmsg_redirect(data);
2728 }
2729 break;
2730 case TIOCL_GETFGCONSOLE:
2731 /* No locking needed as this is a transiently
2732 correct return anyway if the caller hasn't
2733 disabled switching */
2734 ret = fg_console;
2735 break;
2736 case TIOCL_SCROLLCONSOLE:
2737 if (get_user(lines, (s32 __user *)(p+4))) {
2738 ret = -EFAULT;
2739 } else {
2740 /* Need the console lock here. Note that lots
2741 of other calls need fixing before the lock
2742 is actually useful ! */
2743 console_lock();
2744 scrollfront(vc_cons[fg_console].d, lines);
2745 console_unlock();
2746 ret = 0;
2747 }
2748 break;
2749 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2750 console_lock();
2751 ignore_poke = 1;
2752 do_blank_screen(0);
2753 console_unlock();
2754 break;
2755 case TIOCL_BLANKEDSCREEN:
2756 ret = console_blanked;
2757 break;
2758 default:
2759 ret = -EINVAL;
2760 break;
2761 }
2762 return ret;
2763 }
2764
2765 /*
2766 * /dev/ttyN handling
2767 */
2768
2769 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2770 {
2771 int retval;
2772
2773 retval = do_con_write(tty, buf, count);
2774 con_flush_chars(tty);
2775
2776 return retval;
2777 }
2778
2779 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2780 {
2781 if (in_interrupt())
2782 return 0; /* n_r3964 calls put_char() from interrupt context */
2783 return do_con_write(tty, &ch, 1);
2784 }
2785
2786 static int con_write_room(struct tty_struct *tty)
2787 {
2788 if (tty->stopped)
2789 return 0;
2790 return 32768; /* No limit, really; we're not buffering */
2791 }
2792
2793 static int con_chars_in_buffer(struct tty_struct *tty)
2794 {
2795 return 0; /* we're not buffering */
2796 }
2797
2798 /*
2799 * con_throttle and con_unthrottle are only used for
2800 * paste_selection(), which has to stuff in a large number of
2801 * characters...
2802 */
2803 static void con_throttle(struct tty_struct *tty)
2804 {
2805 }
2806
2807 static void con_unthrottle(struct tty_struct *tty)
2808 {
2809 struct vc_data *vc = tty->driver_data;
2810
2811 wake_up_interruptible(&vc->paste_wait);
2812 }
2813
2814 /*
2815 * Turn the Scroll-Lock LED on when the tty is stopped
2816 */
2817 static void con_stop(struct tty_struct *tty)
2818 {
2819 int console_num;
2820 if (!tty)
2821 return;
2822 console_num = tty->index;
2823 if (!vc_cons_allocated(console_num))
2824 return;
2825 vt_kbd_con_stop(console_num);
2826 }
2827
2828 /*
2829 * Turn the Scroll-Lock LED off when the console is started
2830 */
2831 static void con_start(struct tty_struct *tty)
2832 {
2833 int console_num;
2834 if (!tty)
2835 return;
2836 console_num = tty->index;
2837 if (!vc_cons_allocated(console_num))
2838 return;
2839 vt_kbd_con_start(console_num);
2840 }
2841
2842 static void con_flush_chars(struct tty_struct *tty)
2843 {
2844 struct vc_data *vc;
2845
2846 if (in_interrupt()) /* from flush_to_ldisc */
2847 return;
2848
2849 /* if we race with con_close(), vt may be null */
2850 console_lock();
2851 vc = tty->driver_data;
2852 if (vc)
2853 set_cursor(vc);
2854 console_unlock();
2855 }
2856
2857 /*
2858 * Allocate the console screen memory.
2859 */
2860 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2861 {
2862 unsigned int currcons = tty->index;
2863 struct vc_data *vc;
2864 int ret;
2865
2866 console_lock();
2867 ret = vc_allocate(currcons);
2868 if (ret)
2869 goto unlock;
2870
2871 vc = vc_cons[currcons].d;
2872
2873 /* Still being freed */
2874 if (vc->port.tty) {
2875 ret = -ERESTARTSYS;
2876 goto unlock;
2877 }
2878
2879 ret = tty_port_install(&vc->port, driver, tty);
2880 if (ret)
2881 goto unlock;
2882
2883 tty->driver_data = vc;
2884 vc->port.tty = tty;
2885
2886 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2887 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2888 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2889 }
2890 if (vc->vc_utf)
2891 tty->termios.c_iflag |= IUTF8;
2892 else
2893 tty->termios.c_iflag &= ~IUTF8;
2894 unlock:
2895 console_unlock();
2896 return ret;
2897 }
2898
2899 static int con_open(struct tty_struct *tty, struct file *filp)
2900 {
2901 /* everything done in install */
2902 return 0;
2903 }
2904
2905
2906 static void con_close(struct tty_struct *tty, struct file *filp)
2907 {
2908 /* Nothing to do - we defer to shutdown */
2909 }
2910
2911 static void con_shutdown(struct tty_struct *tty)
2912 {
2913 struct vc_data *vc = tty->driver_data;
2914 BUG_ON(vc == NULL);
2915 console_lock();
2916 vc->port.tty = NULL;
2917 console_unlock();
2918 }
2919
2920 static int default_color = 7; /* white */
2921 static int default_italic_color = 2; // green (ASCII)
2922 static int default_underline_color = 3; // cyan (ASCII)
2923 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2924 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2925 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2926
2927 static void vc_init(struct vc_data *vc, unsigned int rows,
2928 unsigned int cols, int do_clear)
2929 {
2930 int j, k ;
2931
2932 vc->vc_cols = cols;
2933 vc->vc_rows = rows;
2934 vc->vc_size_row = cols << 1;
2935 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2936
2937 set_origin(vc);
2938 vc->vc_pos = vc->vc_origin;
2939 reset_vc(vc);
2940 for (j=k=0; j<16; j++) {
2941 vc->vc_palette[k++] = default_red[j] ;
2942 vc->vc_palette[k++] = default_grn[j] ;
2943 vc->vc_palette[k++] = default_blu[j] ;
2944 }
2945 vc->vc_def_color = default_color;
2946 vc->vc_ulcolor = default_underline_color;
2947 vc->vc_itcolor = default_italic_color;
2948 vc->vc_halfcolor = 0x08; /* grey */
2949 init_waitqueue_head(&vc->paste_wait);
2950 reset_terminal(vc, do_clear);
2951 }
2952
2953 /*
2954 * This routine initializes console interrupts, and does nothing
2955 * else. If you want the screen to clear, call tty_write with
2956 * the appropriate escape-sequence.
2957 */
2958
2959 static int __init con_init(void)
2960 {
2961 const char *display_desc = NULL;
2962 struct vc_data *vc;
2963 unsigned int currcons = 0, i;
2964
2965 console_lock();
2966
2967 if (conswitchp)
2968 display_desc = conswitchp->con_startup();
2969 if (!display_desc) {
2970 fg_console = 0;
2971 console_unlock();
2972 return 0;
2973 }
2974
2975 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2976 struct con_driver *con_driver = &registered_con_driver[i];
2977
2978 if (con_driver->con == NULL) {
2979 con_driver->con = conswitchp;
2980 con_driver->desc = display_desc;
2981 con_driver->flag = CON_DRIVER_FLAG_INIT;
2982 con_driver->first = 0;
2983 con_driver->last = MAX_NR_CONSOLES - 1;
2984 break;
2985 }
2986 }
2987
2988 for (i = 0; i < MAX_NR_CONSOLES; i++)
2989 con_driver_map[i] = conswitchp;
2990
2991 if (blankinterval) {
2992 blank_state = blank_normal_wait;
2993 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2994 }
2995
2996 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2997 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2998 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2999 tty_port_init(&vc->port);
3000 visual_init(vc, currcons, 1);
3001 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3002 vc_init(vc, vc->vc_rows, vc->vc_cols,
3003 currcons || !vc->vc_sw->con_save_screen);
3004 }
3005 currcons = fg_console = 0;
3006 master_display_fg = vc = vc_cons[currcons].d;
3007 set_origin(vc);
3008 save_screen(vc);
3009 gotoxy(vc, vc->vc_x, vc->vc_y);
3010 csi_J(vc, 0);
3011 update_screen(vc);
3012 pr_info("Console: %s %s %dx%d\n",
3013 vc->vc_can_do_color ? "colour" : "mono",
3014 display_desc, vc->vc_cols, vc->vc_rows);
3015 printable = 1;
3016
3017 console_unlock();
3018
3019 #ifdef CONFIG_VT_CONSOLE
3020 register_console(&vt_console_driver);
3021 #endif
3022 return 0;
3023 }
3024 console_initcall(con_init);
3025
3026 static const struct tty_operations con_ops = {
3027 .install = con_install,
3028 .open = con_open,
3029 .close = con_close,
3030 .write = con_write,
3031 .write_room = con_write_room,
3032 .put_char = con_put_char,
3033 .flush_chars = con_flush_chars,
3034 .chars_in_buffer = con_chars_in_buffer,
3035 .ioctl = vt_ioctl,
3036 #ifdef CONFIG_COMPAT
3037 .compat_ioctl = vt_compat_ioctl,
3038 #endif
3039 .stop = con_stop,
3040 .start = con_start,
3041 .throttle = con_throttle,
3042 .unthrottle = con_unthrottle,
3043 .resize = vt_resize,
3044 .shutdown = con_shutdown
3045 };
3046
3047 static struct cdev vc0_cdev;
3048
3049 static ssize_t show_tty_active(struct device *dev,
3050 struct device_attribute *attr, char *buf)
3051 {
3052 return sprintf(buf, "tty%d\n", fg_console + 1);
3053 }
3054 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3055
3056 static struct attribute *vt_dev_attrs[] = {
3057 &dev_attr_active.attr,
3058 NULL
3059 };
3060
3061 ATTRIBUTE_GROUPS(vt_dev);
3062
3063 int __init vty_init(const struct file_operations *console_fops)
3064 {
3065 cdev_init(&vc0_cdev, console_fops);
3066 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3067 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3068 panic("Couldn't register /dev/tty0 driver\n");
3069 tty0dev = device_create_with_groups(tty_class, NULL,
3070 MKDEV(TTY_MAJOR, 0), NULL,
3071 vt_dev_groups, "tty0");
3072 if (IS_ERR(tty0dev))
3073 tty0dev = NULL;
3074
3075 vcs_init();
3076
3077 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3078 if (!console_driver)
3079 panic("Couldn't allocate console driver\n");
3080
3081 console_driver->name = "tty";
3082 console_driver->name_base = 1;
3083 console_driver->major = TTY_MAJOR;
3084 console_driver->minor_start = 1;
3085 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3086 console_driver->init_termios = tty_std_termios;
3087 if (default_utf8)
3088 console_driver->init_termios.c_iflag |= IUTF8;
3089 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3090 tty_set_operations(console_driver, &con_ops);
3091 if (tty_register_driver(console_driver))
3092 panic("Couldn't register console driver\n");
3093 kbd_init();
3094 console_map_init();
3095 #ifdef CONFIG_MDA_CONSOLE
3096 mda_console_init();
3097 #endif
3098 return 0;
3099 }
3100
3101 #ifndef VT_SINGLE_DRIVER
3102
3103 static struct class *vtconsole_class;
3104
3105 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3106 int deflt)
3107 {
3108 struct module *owner = csw->owner;
3109 const char *desc = NULL;
3110 struct con_driver *con_driver;
3111 int i, j = -1, k = -1, retval = -ENODEV;
3112
3113 if (!try_module_get(owner))
3114 return -ENODEV;
3115
3116 WARN_CONSOLE_UNLOCKED();
3117
3118 /* check if driver is registered */
3119 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3120 con_driver = &registered_con_driver[i];
3121
3122 if (con_driver->con == csw) {
3123 desc = con_driver->desc;
3124 retval = 0;
3125 break;
3126 }
3127 }
3128
3129 if (retval)
3130 goto err;
3131
3132 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3133 csw->con_startup();
3134 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3135 }
3136
3137 if (deflt) {
3138 if (conswitchp)
3139 module_put(conswitchp->owner);
3140
3141 __module_get(owner);
3142 conswitchp = csw;
3143 }
3144
3145 first = max(first, con_driver->first);
3146 last = min(last, con_driver->last);
3147
3148 for (i = first; i <= last; i++) {
3149 int old_was_color;
3150 struct vc_data *vc = vc_cons[i].d;
3151
3152 if (con_driver_map[i])
3153 module_put(con_driver_map[i]->owner);
3154 __module_get(owner);
3155 con_driver_map[i] = csw;
3156
3157 if (!vc || !vc->vc_sw)
3158 continue;
3159
3160 j = i;
3161
3162 if (CON_IS_VISIBLE(vc)) {
3163 k = i;
3164 save_screen(vc);
3165 }
3166
3167 old_was_color = vc->vc_can_do_color;
3168 vc->vc_sw->con_deinit(vc);
3169 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3170 visual_init(vc, i, 0);
3171 set_origin(vc);
3172 update_attr(vc);
3173
3174 /* If the console changed between mono <-> color, then
3175 * the attributes in the screenbuf will be wrong. The
3176 * following resets all attributes to something sane.
3177 */
3178 if (old_was_color != vc->vc_can_do_color)
3179 clear_buffer_attributes(vc);
3180 }
3181
3182 pr_info("Console: switching ");
3183 if (!deflt)
3184 printk("consoles %d-%d ", first+1, last+1);
3185 if (j >= 0) {
3186 struct vc_data *vc = vc_cons[j].d;
3187
3188 printk("to %s %s %dx%d\n",
3189 vc->vc_can_do_color ? "colour" : "mono",
3190 desc, vc->vc_cols, vc->vc_rows);
3191
3192 if (k >= 0) {
3193 vc = vc_cons[k].d;
3194 update_screen(vc);
3195 }
3196 } else
3197 printk("to %s\n", desc);
3198
3199 retval = 0;
3200 err:
3201 module_put(owner);
3202 return retval;
3203 };
3204
3205
3206 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3207 /* unlocked version of unbind_con_driver() */
3208 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3209 {
3210 struct module *owner = csw->owner;
3211 const struct consw *defcsw = NULL;
3212 struct con_driver *con_driver = NULL, *con_back = NULL;
3213 int i, retval = -ENODEV;
3214
3215 if (!try_module_get(owner))
3216 return -ENODEV;
3217
3218 WARN_CONSOLE_UNLOCKED();
3219
3220 /* check if driver is registered and if it is unbindable */
3221 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3222 con_driver = &registered_con_driver[i];
3223
3224 if (con_driver->con == csw &&
3225 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3226 retval = 0;
3227 break;
3228 }
3229 }
3230
3231 if (retval)
3232 goto err;
3233
3234 retval = -ENODEV;
3235
3236 /* check if backup driver exists */
3237 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3238 con_back = &registered_con_driver[i];
3239
3240 if (con_back->con && con_back->con != csw) {
3241 defcsw = con_back->con;
3242 retval = 0;
3243 break;
3244 }
3245 }
3246
3247 if (retval)
3248 goto err;
3249
3250 if (!con_is_bound(csw))
3251 goto err;
3252
3253 first = max(first, con_driver->first);
3254 last = min(last, con_driver->last);
3255
3256 for (i = first; i <= last; i++) {
3257 if (con_driver_map[i] == csw) {
3258 module_put(csw->owner);
3259 con_driver_map[i] = NULL;
3260 }
3261 }
3262
3263 if (!con_is_bound(defcsw)) {
3264 const struct consw *defconsw = conswitchp;
3265
3266 defcsw->con_startup();
3267 con_back->flag |= CON_DRIVER_FLAG_INIT;
3268 /*
3269 * vgacon may change the default driver to point
3270 * to dummycon, we restore it here...
3271 */
3272 conswitchp = defconsw;
3273 }
3274
3275 if (!con_is_bound(csw))
3276 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3277
3278 /* ignore return value, binding should not fail */
3279 do_bind_con_driver(defcsw, first, last, deflt);
3280 err:
3281 module_put(owner);
3282 return retval;
3283
3284 }
3285 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3286
3287 static int vt_bind(struct con_driver *con)
3288 {
3289 const struct consw *defcsw = NULL, *csw = NULL;
3290 int i, more = 1, first = -1, last = -1, deflt = 0;
3291
3292 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3293 goto err;
3294
3295 csw = con->con;
3296
3297 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3298 struct con_driver *con = &registered_con_driver[i];
3299
3300 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3301 defcsw = con->con;
3302 break;
3303 }
3304 }
3305
3306 if (!defcsw)
3307 goto err;
3308
3309 while (more) {
3310 more = 0;
3311
3312 for (i = con->first; i <= con->last; i++) {
3313 if (con_driver_map[i] == defcsw) {
3314 if (first == -1)
3315 first = i;
3316 last = i;
3317 more = 1;
3318 } else if (first != -1)
3319 break;
3320 }
3321
3322 if (first == 0 && last == MAX_NR_CONSOLES -1)
3323 deflt = 1;
3324
3325 if (first != -1)
3326 do_bind_con_driver(csw, first, last, deflt);
3327
3328 first = -1;
3329 last = -1;
3330 deflt = 0;
3331 }
3332
3333 err:
3334 return 0;
3335 }
3336
3337 static int vt_unbind(struct con_driver *con)
3338 {
3339 const struct consw *csw = NULL;
3340 int i, more = 1, first = -1, last = -1, deflt = 0;
3341 int ret;
3342
3343 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3344 goto err;
3345
3346 csw = con->con;
3347
3348 while (more) {
3349 more = 0;
3350
3351 for (i = con->first; i <= con->last; i++) {
3352 if (con_driver_map[i] == csw) {
3353 if (first == -1)
3354 first = i;
3355 last = i;
3356 more = 1;
3357 } else if (first != -1)
3358 break;
3359 }
3360
3361 if (first == 0 && last == MAX_NR_CONSOLES -1)
3362 deflt = 1;
3363
3364 if (first != -1) {
3365 ret = do_unbind_con_driver(csw, first, last, deflt);
3366 if (ret != 0)
3367 return ret;
3368 }
3369
3370 first = -1;
3371 last = -1;
3372 deflt = 0;
3373 }
3374
3375 err:
3376 return 0;
3377 }
3378 #else
3379 static inline int vt_bind(struct con_driver *con)
3380 {
3381 return 0;
3382 }
3383 static inline int vt_unbind(struct con_driver *con)
3384 {
3385 return 0;
3386 }
3387 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3388
3389 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3390 const char *buf, size_t count)
3391 {
3392 struct con_driver *con = dev_get_drvdata(dev);
3393 int bind = simple_strtoul(buf, NULL, 0);
3394
3395 console_lock();
3396
3397 if (bind)
3398 vt_bind(con);
3399 else
3400 vt_unbind(con);
3401
3402 console_unlock();
3403
3404 return count;
3405 }
3406
3407 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3408 char *buf)
3409 {
3410 struct con_driver *con = dev_get_drvdata(dev);
3411 int bind = con_is_bound(con->con);
3412
3413 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3414 }
3415
3416 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3417 char *buf)
3418 {
3419 struct con_driver *con = dev_get_drvdata(dev);
3420
3421 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3422 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3423 con->desc);
3424
3425 }
3426
3427 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3428 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3429
3430 static struct attribute *con_dev_attrs[] = {
3431 &dev_attr_bind.attr,
3432 &dev_attr_name.attr,
3433 NULL
3434 };
3435
3436 ATTRIBUTE_GROUPS(con_dev);
3437
3438 static int vtconsole_init_device(struct con_driver *con)
3439 {
3440 con->flag |= CON_DRIVER_FLAG_ATTR;
3441 return 0;
3442 }
3443
3444 static void vtconsole_deinit_device(struct con_driver *con)
3445 {
3446 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3447 }
3448
3449 /**
3450 * con_is_bound - checks if driver is bound to the console
3451 * @csw: console driver
3452 *
3453 * RETURNS: zero if unbound, nonzero if bound
3454 *
3455 * Drivers can call this and if zero, they should release
3456 * all resources allocated on con_startup()
3457 */
3458 int con_is_bound(const struct consw *csw)
3459 {
3460 int i, bound = 0;
3461
3462 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3463 if (con_driver_map[i] == csw) {
3464 bound = 1;
3465 break;
3466 }
3467 }
3468
3469 return bound;
3470 }
3471 EXPORT_SYMBOL(con_is_bound);
3472
3473 /**
3474 * con_debug_enter - prepare the console for the kernel debugger
3475 * @sw: console driver
3476 *
3477 * Called when the console is taken over by the kernel debugger, this
3478 * function needs to save the current console state, then put the console
3479 * into a state suitable for the kernel debugger.
3480 *
3481 * RETURNS:
3482 * Zero on success, nonzero if a failure occurred when trying to prepare
3483 * the console for the debugger.
3484 */
3485 int con_debug_enter(struct vc_data *vc)
3486 {
3487 int ret = 0;
3488
3489 saved_fg_console = fg_console;
3490 saved_last_console = last_console;
3491 saved_want_console = want_console;
3492 saved_vc_mode = vc->vc_mode;
3493 saved_console_blanked = console_blanked;
3494 vc->vc_mode = KD_TEXT;
3495 console_blanked = 0;
3496 if (vc->vc_sw->con_debug_enter)
3497 ret = vc->vc_sw->con_debug_enter(vc);
3498 #ifdef CONFIG_KGDB_KDB
3499 /* Set the initial LINES variable if it is not already set */
3500 if (vc->vc_rows < 999) {
3501 int linecount;
3502 char lns[4];
3503 const char *setargs[3] = {
3504 "set",
3505 "LINES",
3506 lns,
3507 };
3508 if (kdbgetintenv(setargs[0], &linecount)) {
3509 snprintf(lns, 4, "%i", vc->vc_rows);
3510 kdb_set(2, setargs);
3511 }
3512 }
3513 if (vc->vc_cols < 999) {
3514 int colcount;
3515 char cols[4];
3516 const char *setargs[3] = {
3517 "set",
3518 "COLUMNS",
3519 cols,
3520 };
3521 if (kdbgetintenv(setargs[0], &colcount)) {
3522 snprintf(cols, 4, "%i", vc->vc_cols);
3523 kdb_set(2, setargs);
3524 }
3525 }
3526 #endif /* CONFIG_KGDB_KDB */
3527 return ret;
3528 }
3529 EXPORT_SYMBOL_GPL(con_debug_enter);
3530
3531 /**
3532 * con_debug_leave - restore console state
3533 * @sw: console driver
3534 *
3535 * Restore the console state to what it was before the kernel debugger
3536 * was invoked.
3537 *
3538 * RETURNS:
3539 * Zero on success, nonzero if a failure occurred when trying to restore
3540 * the console.
3541 */
3542 int con_debug_leave(void)
3543 {
3544 struct vc_data *vc;
3545 int ret = 0;
3546
3547 fg_console = saved_fg_console;
3548 last_console = saved_last_console;
3549 want_console = saved_want_console;
3550 console_blanked = saved_console_blanked;
3551 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3552
3553 vc = vc_cons[fg_console].d;
3554 if (vc->vc_sw->con_debug_leave)
3555 ret = vc->vc_sw->con_debug_leave(vc);
3556 return ret;
3557 }
3558 EXPORT_SYMBOL_GPL(con_debug_leave);
3559
3560 static int do_register_con_driver(const struct consw *csw, int first, int last)
3561 {
3562 struct module *owner = csw->owner;
3563 struct con_driver *con_driver;
3564 const char *desc;
3565 int i, retval = 0;
3566
3567 WARN_CONSOLE_UNLOCKED();
3568
3569 if (!try_module_get(owner))
3570 return -ENODEV;
3571
3572 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3573 con_driver = &registered_con_driver[i];
3574
3575 /* already registered */
3576 if (con_driver->con == csw)
3577 retval = -EBUSY;
3578 }
3579
3580 if (retval)
3581 goto err;
3582
3583 desc = csw->con_startup();
3584
3585 if (!desc)
3586 goto err;
3587
3588 retval = -EINVAL;
3589
3590 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3591 con_driver = &registered_con_driver[i];
3592
3593 if (con_driver->con == NULL &&
3594 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3595 con_driver->con = csw;
3596 con_driver->desc = desc;
3597 con_driver->node = i;
3598 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3599 CON_DRIVER_FLAG_INIT;
3600 con_driver->first = first;
3601 con_driver->last = last;
3602 retval = 0;
3603 break;
3604 }
3605 }
3606
3607 if (retval)
3608 goto err;
3609
3610 con_driver->dev =
3611 device_create_with_groups(vtconsole_class, NULL,
3612 MKDEV(0, con_driver->node),
3613 con_driver, con_dev_groups,
3614 "vtcon%i", con_driver->node);
3615 if (IS_ERR(con_driver->dev)) {
3616 printk(KERN_WARNING "Unable to create device for %s; "
3617 "errno = %ld\n", con_driver->desc,
3618 PTR_ERR(con_driver->dev));
3619 con_driver->dev = NULL;
3620 } else {
3621 vtconsole_init_device(con_driver);
3622 }
3623
3624 err:
3625 module_put(owner);
3626 return retval;
3627 }
3628
3629
3630 /**
3631 * do_unregister_con_driver - unregister console driver from console layer
3632 * @csw: console driver
3633 *
3634 * DESCRIPTION: All drivers that registers to the console layer must
3635 * call this function upon exit, or if the console driver is in a state
3636 * where it won't be able to handle console services, such as the
3637 * framebuffer console without loaded framebuffer drivers.
3638 *
3639 * The driver must unbind first prior to unregistration.
3640 */
3641 int do_unregister_con_driver(const struct consw *csw)
3642 {
3643 int i;
3644
3645 /* cannot unregister a bound driver */
3646 if (con_is_bound(csw))
3647 return -EBUSY;
3648
3649 if (csw == conswitchp)
3650 return -EINVAL;
3651
3652 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3653 struct con_driver *con_driver = &registered_con_driver[i];
3654
3655 if (con_driver->con == csw) {
3656 /*
3657 * Defer the removal of the sysfs entries since that
3658 * will acquire the kernfs s_active lock and we can't
3659 * acquire this lock while holding the console lock:
3660 * the unbind sysfs entry imposes already the opposite
3661 * order. Reset con already here to prevent any later
3662 * lookup to succeed and mark this slot as zombie, so
3663 * it won't get reused until we complete the removal
3664 * in the deferred work.
3665 */
3666 con_driver->con = NULL;
3667 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3668 schedule_work(&con_driver_unregister_work);
3669
3670 return 0;
3671 }
3672 }
3673
3674 return -ENODEV;
3675 }
3676 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3677
3678 static void con_driver_unregister_callback(struct work_struct *ignored)
3679 {
3680 int i;
3681
3682 console_lock();
3683
3684 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3685 struct con_driver *con_driver = &registered_con_driver[i];
3686
3687 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3688 continue;
3689
3690 console_unlock();
3691
3692 vtconsole_deinit_device(con_driver);
3693 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3694
3695 console_lock();
3696
3697 if (WARN_ON_ONCE(con_driver->con))
3698 con_driver->con = NULL;
3699 con_driver->desc = NULL;
3700 con_driver->dev = NULL;
3701 con_driver->node = 0;
3702 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3703 con_driver->flag = 0;
3704 con_driver->first = 0;
3705 con_driver->last = 0;
3706 }
3707
3708 console_unlock();
3709 }
3710
3711 /*
3712 * If we support more console drivers, this function is used
3713 * when a driver wants to take over some existing consoles
3714 * and become default driver for newly opened ones.
3715 *
3716 * do_take_over_console is basically a register followed by unbind
3717 */
3718 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3719 {
3720 int err;
3721
3722 err = do_register_con_driver(csw, first, last);
3723 /*
3724 * If we get an busy error we still want to bind the console driver
3725 * and return success, as we may have unbound the console driver
3726 * but not unregistered it.
3727 */
3728 if (err == -EBUSY)
3729 err = 0;
3730 if (!err)
3731 do_bind_con_driver(csw, first, last, deflt);
3732
3733 return err;
3734 }
3735 EXPORT_SYMBOL_GPL(do_take_over_console);
3736
3737
3738 /*
3739 * give_up_console is a wrapper to unregister_con_driver. It will only
3740 * work if driver is fully unbound.
3741 */
3742 void give_up_console(const struct consw *csw)
3743 {
3744 console_lock();
3745 do_unregister_con_driver(csw);
3746 console_unlock();
3747 }
3748
3749 static int __init vtconsole_class_init(void)
3750 {
3751 int i;
3752
3753 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3754 if (IS_ERR(vtconsole_class)) {
3755 printk(KERN_WARNING "Unable to create vt console class; "
3756 "errno = %ld\n", PTR_ERR(vtconsole_class));
3757 vtconsole_class = NULL;
3758 }
3759
3760 /* Add system drivers to sysfs */
3761 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3762 struct con_driver *con = &registered_con_driver[i];
3763
3764 if (con->con && !con->dev) {
3765 con->dev =
3766 device_create_with_groups(vtconsole_class, NULL,
3767 MKDEV(0, con->node),
3768 con, con_dev_groups,
3769 "vtcon%i", con->node);
3770
3771 if (IS_ERR(con->dev)) {
3772 printk(KERN_WARNING "Unable to create "
3773 "device for %s; errno = %ld\n",
3774 con->desc, PTR_ERR(con->dev));
3775 con->dev = NULL;
3776 } else {
3777 vtconsole_init_device(con);
3778 }
3779 }
3780 }
3781
3782 return 0;
3783 }
3784 postcore_initcall(vtconsole_class_init);
3785
3786 #endif
3787
3788 /*
3789 * Screen blanking
3790 */
3791
3792 static int set_vesa_blanking(char __user *p)
3793 {
3794 unsigned int mode;
3795
3796 if (get_user(mode, p + 1))
3797 return -EFAULT;
3798
3799 vesa_blank_mode = (mode < 4) ? mode : 0;
3800 return 0;
3801 }
3802
3803 void do_blank_screen(int entering_gfx)
3804 {
3805 struct vc_data *vc = vc_cons[fg_console].d;
3806 int i;
3807
3808 WARN_CONSOLE_UNLOCKED();
3809
3810 if (console_blanked) {
3811 if (blank_state == blank_vesa_wait) {
3812 blank_state = blank_off;
3813 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3814 }
3815 return;
3816 }
3817
3818 /* entering graphics mode? */
3819 if (entering_gfx) {
3820 hide_cursor(vc);
3821 save_screen(vc);
3822 vc->vc_sw->con_blank(vc, -1, 1);
3823 console_blanked = fg_console + 1;
3824 blank_state = blank_off;
3825 set_origin(vc);
3826 return;
3827 }
3828
3829 if (blank_state != blank_normal_wait)
3830 return;
3831 blank_state = blank_off;
3832
3833 /* don't blank graphics */
3834 if (vc->vc_mode != KD_TEXT) {
3835 console_blanked = fg_console + 1;
3836 return;
3837 }
3838
3839 hide_cursor(vc);
3840 del_timer_sync(&console_timer);
3841 blank_timer_expired = 0;
3842
3843 save_screen(vc);
3844 /* In case we need to reset origin, blanking hook returns 1 */
3845 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3846 console_blanked = fg_console + 1;
3847 if (i)
3848 set_origin(vc);
3849
3850 if (console_blank_hook && console_blank_hook(1))
3851 return;
3852
3853 if (vesa_off_interval && vesa_blank_mode) {
3854 blank_state = blank_vesa_wait;
3855 mod_timer(&console_timer, jiffies + vesa_off_interval);
3856 }
3857 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3858 }
3859 EXPORT_SYMBOL(do_blank_screen);
3860
3861 /*
3862 * Called by timer as well as from vt_console_driver
3863 */
3864 void do_unblank_screen(int leaving_gfx)
3865 {
3866 struct vc_data *vc;
3867
3868 /* This should now always be called from a "sane" (read: can schedule)
3869 * context for the sake of the low level drivers, except in the special
3870 * case of oops_in_progress
3871 */
3872 if (!oops_in_progress)
3873 might_sleep();
3874
3875 WARN_CONSOLE_UNLOCKED();
3876
3877 ignore_poke = 0;
3878 if (!console_blanked)
3879 return;
3880 if (!vc_cons_allocated(fg_console)) {
3881 /* impossible */
3882 pr_warn("unblank_screen: tty %d not allocated ??\n",
3883 fg_console + 1);
3884 return;
3885 }
3886 vc = vc_cons[fg_console].d;
3887 /* Try to unblank in oops case too */
3888 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3889 return; /* but leave console_blanked != 0 */
3890
3891 if (blankinterval) {
3892 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3893 blank_state = blank_normal_wait;
3894 }
3895
3896 console_blanked = 0;
3897 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3898 /* Low-level driver cannot restore -> do it ourselves */
3899 update_screen(vc);
3900 if (console_blank_hook)
3901 console_blank_hook(0);
3902 set_palette(vc);
3903 set_cursor(vc);
3904 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3905 }
3906 EXPORT_SYMBOL(do_unblank_screen);
3907
3908 /*
3909 * This is called by the outside world to cause a forced unblank, mostly for
3910 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3911 * call it with 1 as an argument and so force a mode restore... that may kill
3912 * X or at least garbage the screen but would also make the Oops visible...
3913 */
3914 void unblank_screen(void)
3915 {
3916 do_unblank_screen(0);
3917 }
3918
3919 /*
3920 * We defer the timer blanking to work queue so it can take the console mutex
3921 * (console operations can still happen at irq time, but only from printk which
3922 * has the console mutex. Not perfect yet, but better than no locking
3923 */
3924 static void blank_screen_t(unsigned long dummy)
3925 {
3926 if (unlikely(!keventd_up())) {
3927 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3928 return;
3929 }
3930 blank_timer_expired = 1;
3931 schedule_work(&console_work);
3932 }
3933
3934 void poke_blanked_console(void)
3935 {
3936 WARN_CONSOLE_UNLOCKED();
3937
3938 /* Add this so we quickly catch whoever might call us in a non
3939 * safe context. Nowadays, unblank_screen() isn't to be called in
3940 * atomic contexts and is allowed to schedule (with the special case
3941 * of oops_in_progress, but that isn't of any concern for this
3942 * function. --BenH.
3943 */
3944 might_sleep();
3945
3946 /* This isn't perfectly race free, but a race here would be mostly harmless,
3947 * at worse, we'll do a spurrious blank and it's unlikely
3948 */
3949 del_timer(&console_timer);
3950 blank_timer_expired = 0;
3951
3952 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3953 return;
3954 if (console_blanked)
3955 unblank_screen();
3956 else if (blankinterval) {
3957 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3958 blank_state = blank_normal_wait;
3959 }
3960 }
3961
3962 /*
3963 * Palettes
3964 */
3965
3966 static void set_palette(struct vc_data *vc)
3967 {
3968 WARN_CONSOLE_UNLOCKED();
3969
3970 if (vc->vc_mode != KD_GRAPHICS)
3971 vc->vc_sw->con_set_palette(vc, color_table);
3972 }
3973
3974 /*
3975 * Load palette into the DAC registers. arg points to a colour
3976 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3977 */
3978
3979 int con_set_cmap(unsigned char __user *arg)
3980 {
3981 int i, j, k;
3982 unsigned char colormap[3*16];
3983
3984 if (copy_from_user(colormap, arg, sizeof(colormap)))
3985 return -EFAULT;
3986
3987 console_lock();
3988 for (i = k = 0; i < 16; i++) {
3989 default_red[i] = colormap[k++];
3990 default_grn[i] = colormap[k++];
3991 default_blu[i] = colormap[k++];
3992 }
3993 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3994 if (!vc_cons_allocated(i))
3995 continue;
3996 for (j = k = 0; j < 16; j++) {
3997 vc_cons[i].d->vc_palette[k++] = default_red[j];
3998 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3999 vc_cons[i].d->vc_palette[k++] = default_blu[j];
4000 }
4001 set_palette(vc_cons[i].d);
4002 }
4003 console_unlock();
4004
4005 return 0;
4006 }
4007
4008 int con_get_cmap(unsigned char __user *arg)
4009 {
4010 int i, k;
4011 unsigned char colormap[3*16];
4012
4013 console_lock();
4014 for (i = k = 0; i < 16; i++) {
4015 colormap[k++] = default_red[i];
4016 colormap[k++] = default_grn[i];
4017 colormap[k++] = default_blu[i];
4018 }
4019 console_unlock();
4020
4021 if (copy_to_user(arg, colormap, sizeof(colormap)))
4022 return -EFAULT;
4023
4024 return 0;
4025 }
4026
4027 void reset_palette(struct vc_data *vc)
4028 {
4029 int j, k;
4030 for (j=k=0; j<16; j++) {
4031 vc->vc_palette[k++] = default_red[j];
4032 vc->vc_palette[k++] = default_grn[j];
4033 vc->vc_palette[k++] = default_blu[j];
4034 }
4035 set_palette(vc);
4036 }
4037
4038 /*
4039 * Font switching
4040 *
4041 * Currently we only support fonts up to 32 pixels wide, at a maximum height
4042 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
4043 * depending on width) reserved for each character which is kinda wasty, but
4044 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
4045 * is up to the actual low-level console-driver convert data into its favorite
4046 * format (maybe we should add a `fontoffset' field to the `display'
4047 * structure so we won't have to convert the fontdata all the time.
4048 * /Jes
4049 */
4050
4051 #define max_font_size 65536
4052
4053 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4054 {
4055 struct console_font font;
4056 int rc = -EINVAL;
4057 int c;
4058
4059 if (op->data) {
4060 font.data = kmalloc(max_font_size, GFP_KERNEL);
4061 if (!font.data)
4062 return -ENOMEM;
4063 } else
4064 font.data = NULL;
4065
4066 console_lock();
4067 if (vc->vc_mode != KD_TEXT)
4068 rc = -EINVAL;
4069 else if (vc->vc_sw->con_font_get)
4070 rc = vc->vc_sw->con_font_get(vc, &font);
4071 else
4072 rc = -ENOSYS;
4073 console_unlock();
4074
4075 if (rc)
4076 goto out;
4077
4078 c = (font.width+7)/8 * 32 * font.charcount;
4079
4080 if (op->data && font.charcount > op->charcount)
4081 rc = -ENOSPC;
4082 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4083 if (font.width > op->width || font.height > op->height)
4084 rc = -ENOSPC;
4085 } else {
4086 if (font.width != 8)
4087 rc = -EIO;
4088 else if ((op->height && font.height > op->height) ||
4089 font.height > 32)
4090 rc = -ENOSPC;
4091 }
4092 if (rc)
4093 goto out;
4094
4095 op->height = font.height;
4096 op->width = font.width;
4097 op->charcount = font.charcount;
4098
4099 if (op->data && copy_to_user(op->data, font.data, c))
4100 rc = -EFAULT;
4101
4102 out:
4103 kfree(font.data);
4104 return rc;
4105 }
4106
4107 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4108 {
4109 struct console_font font;
4110 int rc = -EINVAL;
4111 int size;
4112
4113 if (vc->vc_mode != KD_TEXT)
4114 return -EINVAL;
4115 if (!op->data)
4116 return -EINVAL;
4117 if (op->charcount > 512)
4118 return -EINVAL;
4119 if (!op->height) { /* Need to guess font height [compat] */
4120 int h, i;
4121 u8 __user *charmap = op->data;
4122 u8 tmp;
4123
4124 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4125 so that we can get rid of this soon */
4126 if (!(op->flags & KD_FONT_FLAG_OLD))
4127 return -EINVAL;
4128 for (h = 32; h > 0; h--)
4129 for (i = 0; i < op->charcount; i++) {
4130 if (get_user(tmp, &charmap[32*i+h-1]))
4131 return -EFAULT;
4132 if (tmp)
4133 goto nonzero;
4134 }
4135 return -EINVAL;
4136 nonzero:
4137 op->height = h;
4138 }
4139 if (op->width <= 0 || op->width > 32 || op->height > 32)
4140 return -EINVAL;
4141 size = (op->width+7)/8 * 32 * op->charcount;
4142 if (size > max_font_size)
4143 return -ENOSPC;
4144 font.charcount = op->charcount;
4145 font.height = op->height;
4146 font.width = op->width;
4147 font.data = memdup_user(op->data, size);
4148 if (IS_ERR(font.data))
4149 return PTR_ERR(font.data);
4150 console_lock();
4151 if (vc->vc_mode != KD_TEXT)
4152 rc = -EINVAL;
4153 else if (vc->vc_sw->con_font_set)
4154 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4155 else
4156 rc = -ENOSYS;
4157 console_unlock();
4158 kfree(font.data);
4159 return rc;
4160 }
4161
4162 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4163 {
4164 struct console_font font = {.width = op->width, .height = op->height};
4165 char name[MAX_FONT_NAME];
4166 char *s = name;
4167 int rc;
4168
4169
4170 if (!op->data)
4171 s = NULL;
4172 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4173 return -EFAULT;
4174 else
4175 name[MAX_FONT_NAME - 1] = 0;
4176
4177 console_lock();
4178 if (vc->vc_mode != KD_TEXT) {
4179 console_unlock();
4180 return -EINVAL;
4181 }
4182 if (vc->vc_sw->con_font_default)
4183 rc = vc->vc_sw->con_font_default(vc, &font, s);
4184 else
4185 rc = -ENOSYS;
4186 console_unlock();
4187 if (!rc) {
4188 op->width = font.width;
4189 op->height = font.height;
4190 }
4191 return rc;
4192 }
4193
4194 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4195 {
4196 int con = op->height;
4197 int rc;
4198
4199
4200 console_lock();
4201 if (vc->vc_mode != KD_TEXT)
4202 rc = -EINVAL;
4203 else if (!vc->vc_sw->con_font_copy)
4204 rc = -ENOSYS;
4205 else if (con < 0 || !vc_cons_allocated(con))
4206 rc = -ENOTTY;
4207 else if (con == vc->vc_num) /* nothing to do */
4208 rc = 0;
4209 else
4210 rc = vc->vc_sw->con_font_copy(vc, con);
4211 console_unlock();
4212 return rc;
4213 }
4214
4215 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4216 {
4217 switch (op->op) {
4218 case KD_FONT_OP_SET:
4219 return con_font_set(vc, op);
4220 case KD_FONT_OP_GET:
4221 return con_font_get(vc, op);
4222 case KD_FONT_OP_SET_DEFAULT:
4223 return con_font_default(vc, op);
4224 case KD_FONT_OP_COPY:
4225 return con_font_copy(vc, op);
4226 }
4227 return -ENOSYS;
4228 }
4229
4230 /*
4231 * Interface exported to selection and vcs.
4232 */
4233
4234 /* used by selection */
4235 u16 screen_glyph(struct vc_data *vc, int offset)
4236 {
4237 u16 w = scr_readw(screenpos(vc, offset, 1));
4238 u16 c = w & 0xff;
4239
4240 if (w & vc->vc_hi_font_mask)
4241 c |= 0x100;
4242 return c;
4243 }
4244 EXPORT_SYMBOL_GPL(screen_glyph);
4245
4246 /* used by vcs - note the word offset */
4247 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4248 {
4249 return screenpos(vc, 2 * w_offset, viewed);
4250 }
4251
4252 void getconsxy(struct vc_data *vc, unsigned char *p)
4253 {
4254 p[0] = vc->vc_x;
4255 p[1] = vc->vc_y;
4256 }
4257
4258 void putconsxy(struct vc_data *vc, unsigned char *p)
4259 {
4260 hide_cursor(vc);
4261 gotoxy(vc, p[0], p[1]);
4262 set_cursor(vc);
4263 }
4264
4265 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4266 {
4267 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4268 return softcursor_original;
4269 return scr_readw(org);
4270 }
4271
4272 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4273 {
4274 scr_writew(val, org);
4275 if ((unsigned long)org == vc->vc_pos) {
4276 softcursor_original = -1;
4277 add_softcursor(vc);
4278 }
4279 }
4280
4281 void vcs_scr_updated(struct vc_data *vc)
4282 {
4283 notify_update(vc);
4284 }
4285
4286 /*
4287 * Visible symbols for modules
4288 */
4289
4290 EXPORT_SYMBOL(color_table);
4291 EXPORT_SYMBOL(default_red);
4292 EXPORT_SYMBOL(default_grn);
4293 EXPORT_SYMBOL(default_blu);
4294 EXPORT_SYMBOL(update_region);
4295 EXPORT_SYMBOL(redraw_screen);
4296 EXPORT_SYMBOL(vc_resize);
4297 EXPORT_SYMBOL(fg_console);
4298 EXPORT_SYMBOL(console_blank_hook);
4299 EXPORT_SYMBOL(console_blanked);
4300 EXPORT_SYMBOL(vc_cons);
4301 EXPORT_SYMBOL(global_cursor_default);
4302 #ifndef VT_SINGLE_DRIVER
4303 EXPORT_SYMBOL(give_up_console);
4304 #endif
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