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