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Add kernel/notifier.c
[deliverable/linux.git] / drivers / char / vt.c
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1da177e4
LT		 1/*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
d4328b40
AT		 66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 73 */
74
75#include <linux/module.h>
76#include <linux/types.h>
77#include <linux/sched.h>
78#include <linux/tty.h>
79#include <linux/tty_flip.h>
80#include <linux/kernel.h>
81#include <linux/string.h>
82#include <linux/errno.h>
83#include <linux/kd.h>
84#include <linux/slab.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
c831c338 89#include <linux/mutex.h>
1da177e4
LT		 90#include <linux/vt_kern.h>
91#include <linux/selection.h>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
1da177e4
LT		 97#include <linux/workqueue.h>
98#include <linux/bootmem.h>
99#include <linux/pm.h>
100#include <linux/font.h>
101#include <linux/bitops.h>
102
103#include <asm/io.h>
104#include <asm/system.h>
105#include <asm/uaccess.h>
106
3e795de7 107#define MAX_NR_CON_DRIVER 16
1da177e4 108
6db4063c 109#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 110#define CON_DRIVER_FLAG_INIT 2
111#define CON_DRIVER_FLAG_ATTR 4
3e795de7
AD		 112
113struct con_driver {
114 const struct consw *con;
115 const char *desc;
805952a8 116 struct device *dev;
6db4063c 117 int node;
3e795de7
AD		 118 int first;
119 int last;
120 int flag;
121};
122
123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 124const 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
1da177e4
LT		 140struct vc vc_cons [MAX_NR_CONSOLES];
141
142#ifndef VT_SINGLE_DRIVER
143static const struct consw *con_driver_map[MAX_NR_CONSOLES];
144#endif
145
146static int con_open(struct tty_struct *, struct file *);
147static void vc_init(struct vc_data *vc, unsigned int rows,
148 unsigned int cols, int do_clear);
149static void gotoxy(struct vc_data *vc, int new_x, int new_y);
150static void save_cur(struct vc_data *vc);
151static void reset_terminal(struct vc_data *vc, int do_clear);
152static void con_flush_chars(struct tty_struct *tty);
403aac96 153static int set_vesa_blanking(char __user *p);
1da177e4
LT		 154static void set_cursor(struct vc_data *vc);
155static void hide_cursor(struct vc_data *vc);
65f27f38 156static void console_callback(struct work_struct *ignored);
1da177e4
LT		 157static void blank_screen_t(unsigned long dummy);
158static void set_palette(struct vc_data *vc);
159
160static int printable; /* Is console ready for printing? */
77bf2bab 161int default_utf8 = true;
042f10ec 162module_param(default_utf8, int, S_IRUGO | S_IWUSR);
1da177e4
LT		 163
164/*
165 * ignore_poke: don't unblank the screen when things are typed. This is
166 * mainly for the privacy of braille terminal users.
167 */
168static int ignore_poke;
169
170int do_poke_blanked_console;
171int console_blanked;
172
173static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
174static int blankinterval = 10*60*HZ;
175static int vesa_off_interval;
176
65f27f38 177static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 178
179/*
180 * fg_console is the current virtual console,
181 * last_console is the last used one,
182 * want_console is the console we want to switch to,
183 * kmsg_redirect is the console for kernel messages,
184 */
185int fg_console;
186int last_console;
187int want_console = -1;
188int kmsg_redirect;
189
190/*
191 * For each existing display, we have a pointer to console currently visible
192 * on that display, allowing consoles other than fg_console to be refreshed
193 * appropriately. Unless the low-level driver supplies its own display_fg
194 * variable, we use this one for the "master display".
195 */
196static struct vc_data *master_display_fg;
197
198/*
199 * Unfortunately, we need to delay tty echo when we're currently writing to the
200 * console since the code is (and always was) not re-entrant, so we schedule
201 * all flip requests to process context with schedule-task() and run it from
202 * console_callback().
203 */
204
205/*
206 * For the same reason, we defer scrollback to the console callback.
207 */
208static int scrollback_delta;
209
210/*
211 * Hook so that the power management routines can (un)blank
212 * the console on our behalf.
213 */
214int (*console_blank_hook)(int);
215
40565f19 216static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 217static int blank_state;
218static int blank_timer_expired;
219enum {
220 blank_off = 0,
221 blank_normal_wait,
222 blank_vesa_wait,
223};
224
225/*
226 * Low-Level Functions
227 */
228
229#define IS_FG(vc) ((vc)->vc_num == fg_console)
230
231#ifdef VT_BUF_VRAM_ONLY
232#define DO_UPDATE(vc) 0
233#else
234#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
235#endif
236
237static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
238{
239 unsigned short *p;
240
241 if (!viewed)
242 p = (unsigned short *)(vc->vc_origin + offset);
243 else if (!vc->vc_sw->con_screen_pos)
244 p = (unsigned short *)(vc->vc_visible_origin + offset);
245 else
246 p = vc->vc_sw->con_screen_pos(vc, offset);
247 return p;
248}
249
250static inline void scrolldelta(int lines)
251{
252 scrollback_delta += lines;
253 schedule_console_callback();
254}
255
256void schedule_console_callback(void)
257{
258 schedule_work(&console_work);
259}
260
261static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
262{
263 unsigned short *d, *s;
264
265 if (t+nr >= b)
266 nr = b - t - 1;
267 if (b > vc->vc_rows || t >= b || nr < 1)
268 return;
269 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
270 return;
271 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
272 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
273 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
274 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
275 vc->vc_size_row * nr);
276}
277
278static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
279{
280 unsigned short *s;
281 unsigned int step;
282
283 if (t+nr >= b)
284 nr = b - t - 1;
285 if (b > vc->vc_rows || t >= b || nr < 1)
286 return;
287 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
288 return;
289 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
290 step = vc->vc_cols * nr;
291 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
292 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
293}
294
295static void do_update_region(struct vc_data *vc, unsigned long start, int count)
296{
297#ifndef VT_BUF_VRAM_ONLY
298 unsigned int xx, yy, offset;
299 u16 *p;
300
301 p = (u16 *) start;
302 if (!vc->vc_sw->con_getxy) {
303 offset = (start - vc->vc_origin) / 2;
304 xx = offset % vc->vc_cols;
305 yy = offset / vc->vc_cols;
306 } else {
307 int nxx, nyy;
308 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
309 xx = nxx; yy = nyy;
310 }
311 for(;;) {
312 u16 attrib = scr_readw(p) & 0xff00;
313 int startx = xx;
314 u16 *q = p;
315 while (xx < vc->vc_cols && count) {
316 if (attrib != (scr_readw(p) & 0xff00)) {
317 if (p > q)
318 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
319 startx = xx;
320 q = p;
321 attrib = scr_readw(p) & 0xff00;
322 }
323 p++;
324 xx++;
325 count--;
326 }
327 if (p > q)
328 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
329 if (!count)
330 break;
331 xx = 0;
332 yy++;
333 if (vc->vc_sw->con_getxy) {
334 p = (u16 *)start;
335 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
336 }
337 }
338#endif
339}
340
341void update_region(struct vc_data *vc, unsigned long start, int count)
342{
343 WARN_CONSOLE_UNLOCKED();
344
345 if (DO_UPDATE(vc)) {
346 hide_cursor(vc);
347 do_update_region(vc, start, count);
348 set_cursor(vc);
349 }
350}
351
352/* Structure of attributes is hardware-dependent */
353
fa6ce9ab
JE		 354static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
355 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 356{
357 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 358 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
359 _blink, _underline, _reverse, _italic);
1da177e4
LT		 360
361#ifndef VT_BUF_VRAM_ONLY
362/*
363 * ++roman: I completely changed the attribute format for monochrome
364 * mode (!can_do_color). The formerly used MDA (monochrome display
365 * adapter) format didn't allow the combination of certain effects.
366 * Now the attribute is just a bit vector:
367 * Bit 0..1: intensity (0..2)
368 * Bit 2 : underline
369 * Bit 3 : reverse
370 * Bit 7 : blink
371 */
372 {
373 u8 a = vc->vc_color;
374 if (!vc->vc_can_do_color)
375 return _intensity |
fa6ce9ab 376 (_italic ? 2 : 0) |
1da177e4
LT		 377 (_underline ? 4 : 0) |
378 (_reverse ? 8 : 0) |
379 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 380 if (_italic)
381 a = (a & 0xF0) | vc->vc_itcolor;
382 else if (_underline)
1da177e4
LT		 383 a = (a & 0xf0) | vc->vc_ulcolor;
384 else if (_intensity == 0)
385 a = (a & 0xf0) | vc->vc_ulcolor;
386 if (_reverse)
387 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
388 if (_blink)
389 a ^= 0x80;
390 if (_intensity == 2)
391 a ^= 0x08;
392 if (vc->vc_hi_font_mask == 0x100)
393 a <<= 1;
394 return a;
395 }
396#else
397 return 0;
398#endif
399}
400
401static void update_attr(struct vc_data *vc)
402{
fa6ce9ab
JE		 403 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
404 vc->vc_blink, vc->vc_underline,
405 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
406 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 407}
408
409/* Note: inverting the screen twice should revert to the original state */
410void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
411{
412 unsigned short *p;
413
414 WARN_CONSOLE_UNLOCKED();
415
416 count /= 2;
417 p = screenpos(vc, offset, viewed);
418 if (vc->vc_sw->con_invert_region)
419 vc->vc_sw->con_invert_region(vc, p, count);
420#ifndef VT_BUF_VRAM_ONLY
421 else {
422 u16 *q = p;
423 int cnt = count;
424 u16 a;
425
426 if (!vc->vc_can_do_color) {
427 while (cnt--) {
428 a = scr_readw(q);
429 a ^= 0x0800;
430 scr_writew(a, q);
431 q++;
432 }
433 } else if (vc->vc_hi_font_mask == 0x100) {
434 while (cnt--) {
435 a = scr_readw(q);
436 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
437 scr_writew(a, q);
438 q++;
439 }
440 } else {
441 while (cnt--) {
442 a = scr_readw(q);
443 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
444 scr_writew(a, q);
445 q++;
446 }
447 }
448 }
449#endif
450 if (DO_UPDATE(vc))
451 do_update_region(vc, (unsigned long) p, count);
452}
453
454/* used by selection: complement pointer position */
455void complement_pos(struct vc_data *vc, int offset)
456{
414edcd3 457 static int old_offset = -1;
1da177e4
LT		 458 static unsigned short old;
459 static unsigned short oldx, oldy;
460
461 WARN_CONSOLE_UNLOCKED();
462
414edcd3
AD		 463 if (old_offset != -1 && old_offset >= 0 &&
464 old_offset < vc->vc_screenbuf_size) {
465 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 466 if (DO_UPDATE(vc))
467 vc->vc_sw->con_putc(vc, old, oldy, oldx);
468 }
414edcd3
AD		 469
470 old_offset = offset;
471
472 if (offset != -1 && offset >= 0 &&
473 offset < vc->vc_screenbuf_size) {
1da177e4 474 unsigned short new;
414edcd3 475 unsigned short *p;
1da177e4
LT		 476 p = screenpos(vc, offset, 1);
477 old = scr_readw(p);
478 new = old ^ vc->vc_complement_mask;
479 scr_writew(new, p);
480 if (DO_UPDATE(vc)) {
481 oldx = (offset >> 1) % vc->vc_cols;
482 oldy = (offset >> 1) / vc->vc_cols;
483 vc->vc_sw->con_putc(vc, new, oldy, oldx);
484 }
485 }
414edcd3 486
1da177e4
LT		 487}
488
489static void insert_char(struct vc_data *vc, unsigned int nr)
490{
491 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
492
493 p = q + vc->vc_cols - nr - vc->vc_x;
494 while (--p >= q)
495 scr_writew(scr_readw(p), p + nr);
496 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
497 vc->vc_need_wrap = 0;
498 if (DO_UPDATE(vc)) {
499 unsigned short oldattr = vc->vc_attr;
500 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
501 vc->vc_cols - vc->vc_x - nr);
502 vc->vc_attr = vc->vc_video_erase_char >> 8;
503 while (nr--)
504 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
505 vc->vc_attr = oldattr;
506 }
507}
508
509static void delete_char(struct vc_data *vc, unsigned int nr)
510{
511 unsigned int i = vc->vc_x;
512 unsigned short *p = (unsigned short *)vc->vc_pos;
513
514 while (++i <= vc->vc_cols - nr) {
515 scr_writew(scr_readw(p+nr), p);
516 p++;
517 }
518 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
519 vc->vc_need_wrap = 0;
520 if (DO_UPDATE(vc)) {
521 unsigned short oldattr = vc->vc_attr;
522 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
523 vc->vc_cols - vc->vc_x - nr);
524 vc->vc_attr = vc->vc_video_erase_char >> 8;
525 while (nr--)
526 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
527 vc->vc_cols - 1 - nr);
528 vc->vc_attr = oldattr;
529 }
530}
531
532static int softcursor_original;
533
534static void add_softcursor(struct vc_data *vc)
535{
536 int i = scr_readw((u16 *) vc->vc_pos);
537 u32 type = vc->vc_cursor_type;
538
539 if (! (type & 0x10)) return;
540 if (softcursor_original != -1) return;
541 softcursor_original = i;
542 i |= ((type >> 8) & 0xff00 );
543 i ^= ((type) & 0xff00 );
544 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
545 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
546 scr_writew(i, (u16 *) vc->vc_pos);
547 if (DO_UPDATE(vc))
548 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
549}
550
551static void hide_softcursor(struct vc_data *vc)
552{
553 if (softcursor_original != -1) {
554 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
555 if (DO_UPDATE(vc))
556 vc->vc_sw->con_putc(vc, softcursor_original,
557 vc->vc_y, vc->vc_x);
558 softcursor_original = -1;
559 }
560}
561
562static void hide_cursor(struct vc_data *vc)
563{
564 if (vc == sel_cons)
565 clear_selection();
566 vc->vc_sw->con_cursor(vc, CM_ERASE);
567 hide_softcursor(vc);
568}
569
570static void set_cursor(struct vc_data *vc)
571{
572 if (!IS_FG(vc) || console_blanked ||
573 vc->vc_mode == KD_GRAPHICS)
574 return;
575 if (vc->vc_deccm) {
576 if (vc == sel_cons)
577 clear_selection();
578 add_softcursor(vc);
579 if ((vc->vc_cursor_type & 0x0f) != 1)
580 vc->vc_sw->con_cursor(vc, CM_DRAW);
581 } else
582 hide_cursor(vc);
583}
584
585static void set_origin(struct vc_data *vc)
586{
587 WARN_CONSOLE_UNLOCKED();
588
589 if (!CON_IS_VISIBLE(vc) ||
590 !vc->vc_sw->con_set_origin ||
591 !vc->vc_sw->con_set_origin(vc))
592 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
593 vc->vc_visible_origin = vc->vc_origin;
594 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
595 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
596}
597
598static inline void save_screen(struct vc_data *vc)
599{
600 WARN_CONSOLE_UNLOCKED();
601
602 if (vc->vc_sw->con_save_screen)
603 vc->vc_sw->con_save_screen(vc);
604}
605
606/*
607 * Redrawing of screen
608 */
609
610static void clear_buffer_attributes(struct vc_data *vc)
611{
612 unsigned short *p = (unsigned short *)vc->vc_origin;
613 int count = vc->vc_screenbuf_size / 2;
614 int mask = vc->vc_hi_font_mask | 0xff;
615
616 for (; count > 0; count--, p++) {
617 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
618 }
619}
620
621void redraw_screen(struct vc_data *vc, int is_switch)
622{
623 int redraw = 0;
624
625 WARN_CONSOLE_UNLOCKED();
626
627 if (!vc) {
628 /* strange ... */
629 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
630 return;
631 }
632
633 if (is_switch) {
634 struct vc_data *old_vc = vc_cons[fg_console].d;
635 if (old_vc == vc)
636 return;
637 if (!CON_IS_VISIBLE(vc))
638 redraw = 1;
639 *vc->vc_display_fg = vc;
640 fg_console = vc->vc_num;
641 hide_cursor(old_vc);
642 if (!CON_IS_VISIBLE(old_vc)) {
643 save_screen(old_vc);
644 set_origin(old_vc);
645 }
646 } else {
647 hide_cursor(vc);
648 redraw = 1;
649 }
650
651 if (redraw) {
652 int update;
653 int old_was_color = vc->vc_can_do_color;
654
655 set_origin(vc);
656 update = vc->vc_sw->con_switch(vc);
657 set_palette(vc);
658 /*
659 * If console changed from mono<->color, the best we can do
660 * is to clear the buffer attributes. As it currently stands,
661 * rebuilding new attributes from the old buffer is not doable
662 * without overly complex code.
663 */
664 if (old_was_color != vc->vc_can_do_color) {
665 update_attr(vc);
666 clear_buffer_attributes(vc);
667 }
668 if (update && vc->vc_mode != KD_GRAPHICS)
669 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
670 }
671 set_cursor(vc);
672 if (is_switch) {
673 set_leds();
674 compute_shiftstate();
675 }
676}
677
678/*
679 * Allocation, freeing and resizing of VTs.
680 */
681
682int vc_cons_allocated(unsigned int i)
683{
684 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
685}
686
687static void visual_init(struct vc_data *vc, int num, int init)
688{
689 /* ++Geert: vc->vc_sw->con_init determines console size */
690 if (vc->vc_sw)
691 module_put(vc->vc_sw->owner);
692 vc->vc_sw = conswitchp;
693#ifndef VT_SINGLE_DRIVER
694 if (con_driver_map[num])
695 vc->vc_sw = con_driver_map[num];
696#endif
697 __module_get(vc->vc_sw->owner);
698 vc->vc_num = num;
699 vc->vc_display_fg = &master_display_fg;
700 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
701 vc->vc_uni_pagedir = 0;
702 vc->vc_hi_font_mask = 0;
703 vc->vc_complement_mask = 0;
704 vc->vc_can_do_color = 0;
705 vc->vc_sw->con_init(vc, init);
706 if (!vc->vc_complement_mask)
707 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
708 vc->vc_s_complement_mask = vc->vc_complement_mask;
709 vc->vc_size_row = vc->vc_cols << 1;
710 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
711}
712
713int vc_allocate(unsigned int currcons) /* return 0 on success */
714{
715 WARN_CONSOLE_UNLOCKED();
716
717 if (currcons >= MAX_NR_CONSOLES)
718 return -ENXIO;
719 if (!vc_cons[currcons].d) {
720 struct vc_data *vc;
721
722 /* prevent users from taking too much memory */
723 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
724 return -EPERM;
725
726 /* due to the granularity of kmalloc, we waste some memory here */
727 /* the alloc is done in two steps, to optimize the common situation
728 of a 25x80 console (structsize=216, screenbuf_size=4000) */
729 /* although the numbers above are not valid since long ago, the
730 point is still up-to-date and the comment still has its value
731 even if only as a historical artifact. --mj, July 1998 */
a1152934 732 vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 733 if (!vc)
734 return -ENOMEM;
1da177e4 735 vc_cons[currcons].d = vc;
c2c88f10 736 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 737 visual_init(vc, currcons, 1);
738 if (!*vc->vc_uni_pagedir_loc)
739 con_set_default_unimap(vc);
254e948b
CM		 740 if (!vc->vc_kmalloced)
741 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 742 if (!vc->vc_screenbuf) {
743 kfree(vc);
744 vc_cons[currcons].d = NULL;
745 return -ENOMEM;
746 }
747 vc->vc_kmalloced = 1;
748 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
749 }
750 return 0;
751}
752
e400b6ec
AD		 753static inline int resize_screen(struct vc_data *vc, int width, int height,
754 int user)
1da177e4
LT		 755{
756 /* Resizes the resolution of the display adapater */
757 int err = 0;
758
759 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 760 err = vc->vc_sw->con_resize(vc, width, height, user);
761
1da177e4
LT		 762 return err;
763}
764
765/*
766 * Change # of rows and columns (0 means unchanged/the size of fg_console)
767 * [this is to be used together with some user program
768 * like resize that changes the hardware videomode]
769 */
770#define VC_RESIZE_MAXCOL (32767)
771#define VC_RESIZE_MAXROW (32767)
772int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
773{
774 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
775 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
776 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
e400b6ec 777 unsigned int end, user;
1da177e4
LT		 778 unsigned short *newscreen;
779
780 WARN_CONSOLE_UNLOCKED();
781
782 if (!vc)
783 return -ENXIO;
784
e400b6ec
AD		 785 user = vc->vc_resize_user;
786 vc->vc_resize_user = 0;
787
1da177e4
LT		 788 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
789 return -EINVAL;
790
791 new_cols = (cols ? cols : vc->vc_cols);
792 new_rows = (lines ? lines : vc->vc_rows);
793 new_row_size = new_cols << 1;
794 new_screen_size = new_row_size * new_rows;
795
796 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
797 return 0;
798
5cbded58 799 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 800 if (!newscreen)
801 return -ENOMEM;
802
803 old_rows = vc->vc_rows;
804 old_cols = vc->vc_cols;
805 old_row_size = vc->vc_size_row;
806 old_screen_size = vc->vc_screenbuf_size;
807
e400b6ec 808 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 809 if (err) {
810 kfree(newscreen);
811 return err;
812 }
813
814 vc->vc_rows = new_rows;
815 vc->vc_cols = new_cols;
816 vc->vc_size_row = new_row_size;
817 vc->vc_screenbuf_size = new_screen_size;
818
819 rlth = min(old_row_size, new_row_size);
820 rrem = new_row_size - rlth;
821 old_origin = vc->vc_origin;
822 new_origin = (long) newscreen;
823 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 824
825 if (vc->vc_y > new_rows) {
826 if (old_rows - vc->vc_y < new_rows) {
827 /*
828 * Cursor near the bottom, copy contents from the
829 * bottom of buffer
830 */
831 old_origin += (old_rows - new_rows) * old_row_size;
832 end = vc->vc_scr_end;
833 } else {
834 /*
835 * Cursor is in no man's land, copy 1/2 screenful
836 * from the top and bottom of cursor position
837 */
838 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 839 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 840 }
841 } else
842 /*
843 * Cursor near the top, copy contents from the top of buffer
844 */
065d9cac
AD		 845 end = (old_rows > new_rows) ? old_origin +
846 (old_row_size * new_rows) :
3b41dc1a 847 vc->vc_scr_end;
1da177e4
LT		 848
849 update_attr(vc);
850
3b41dc1a
AD		 851 while (old_origin < end) {
852 scr_memcpyw((unsigned short *) new_origin,
853 (unsigned short *) old_origin, rlth);
1da177e4 854 if (rrem)
3b41dc1a
AD		 855 scr_memsetw((void *)(new_origin + rlth),
856 vc->vc_video_erase_char, rrem);
1da177e4
LT		 857 old_origin += old_row_size;
858 new_origin += new_row_size;
859 }
860 if (new_scr_end > new_origin)
3b41dc1a
AD		 861 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
862 new_scr_end - new_origin);
1da177e4
LT		 863 if (vc->vc_kmalloced)
864 kfree(vc->vc_screenbuf);
865 vc->vc_screenbuf = newscreen;
866 vc->vc_kmalloced = 1;
867 vc->vc_screenbuf_size = new_screen_size;
868 set_origin(vc);
869
870 /* do part of a reset_terminal() */
871 vc->vc_top = 0;
872 vc->vc_bottom = vc->vc_rows;
873 gotoxy(vc, vc->vc_x, vc->vc_y);
874 save_cur(vc);
875
876 if (vc->vc_tty) {
877 struct winsize ws, *cws = &vc->vc_tty->winsize;
878
879 memset(&ws, 0, sizeof(ws));
880 ws.ws_row = vc->vc_rows;
881 ws.ws_col = vc->vc_cols;
882 ws.ws_ypixel = vc->vc_scan_lines;
883 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
ab521dc0
EB		 884 vc->vc_tty->pgrp)
885 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
1da177e4
LT		 886 *cws = ws;
887 }
888
889 if (CON_IS_VISIBLE(vc))
890 update_screen(vc);
891 return err;
892}
893
ca9bda00
AC		 894int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
895{
896 int rc;
897
898 acquire_console_sem();
899 rc = vc_resize(vc, cols, lines);
900 release_console_sem();
901 return rc;
902}
1da177e4 903
ca9bda00 904void vc_deallocate(unsigned int currcons)
1da177e4
LT		 905{
906 WARN_CONSOLE_UNLOCKED();
907
908 if (vc_cons_allocated(currcons)) {
909 struct vc_data *vc = vc_cons[currcons].d;
910 vc->vc_sw->con_deinit(vc);
bde0d2c9 911 put_pid(vc->vt_pid);
d459ec0b 912 module_put(vc->vc_sw->owner);
1da177e4
LT		 913 if (vc->vc_kmalloced)
914 kfree(vc->vc_screenbuf);
915 if (currcons >= MIN_NR_CONSOLES)
916 kfree(vc);
917 vc_cons[currcons].d = NULL;
918 }
919}
920
921/*
922 * VT102 emulator
923 */
924
925#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
926#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
927#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
928
929#define decarm VC_REPEAT
930#define decckm VC_CKMODE
931#define kbdapplic VC_APPLIC
932#define lnm VC_CRLF
933
934/*
935 * this is what the terminal answers to a ESC-Z or csi0c query.
936 */
937#define VT100ID "\033[?1;2c"
938#define VT102ID "\033[?6c"
939
940unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
941 8,12,10,14, 9,13,11,15 };
942
943/* the default colour table, for VGA+ colour systems */
944int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
945 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
946int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
947 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
948int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
949 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
950
1c2bbe6a
JE		 951module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
952module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
953module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
954
1da177e4
LT		 955/*
956 * gotoxy() must verify all boundaries, because the arguments
957 * might also be negative. If the given position is out of
958 * bounds, the cursor is placed at the nearest margin.
959 */
960static void gotoxy(struct vc_data *vc, int new_x, int new_y)
961{
962 int min_y, max_y;
963
964 if (new_x < 0)
965 vc->vc_x = 0;
966 else {
967 if (new_x >= vc->vc_cols)
968 vc->vc_x = vc->vc_cols - 1;
969 else
970 vc->vc_x = new_x;
971 }
972
973 if (vc->vc_decom) {
974 min_y = vc->vc_top;
975 max_y = vc->vc_bottom;
976 } else {
977 min_y = 0;
978 max_y = vc->vc_rows;
979 }
980 if (new_y < min_y)
981 vc->vc_y = min_y;
982 else if (new_y >= max_y)
983 vc->vc_y = max_y - 1;
984 else
985 vc->vc_y = new_y;
986 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
987 vc->vc_need_wrap = 0;
988}
989
990/* for absolute user moves, when decom is set */
991static void gotoxay(struct vc_data *vc, int new_x, int new_y)
992{
993 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
994}
995
996void scrollback(struct vc_data *vc, int lines)
997{
998 if (!lines)
999 lines = vc->vc_rows / 2;
1000 scrolldelta(-lines);
1001}
1002
1003void scrollfront(struct vc_data *vc, int lines)
1004{
1005 if (!lines)
1006 lines = vc->vc_rows / 2;
1007 scrolldelta(lines);
1008}
1009
1010static void lf(struct vc_data *vc)
1011{
1012 /* don't scroll if above bottom of scrolling region, or
1013 * if below scrolling region
1014 */
1015 if (vc->vc_y + 1 == vc->vc_bottom)
1016 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1017 else if (vc->vc_y < vc->vc_rows - 1) {
1018 vc->vc_y++;
1019 vc->vc_pos += vc->vc_size_row;
1020 }
1021 vc->vc_need_wrap = 0;
1022}
1023
1024static void ri(struct vc_data *vc)
1025{
1026 /* don't scroll if below top of scrolling region, or
1027 * if above scrolling region
1028 */
1029 if (vc->vc_y == vc->vc_top)
1030 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1031 else if (vc->vc_y > 0) {
1032 vc->vc_y--;
1033 vc->vc_pos -= vc->vc_size_row;
1034 }
1035 vc->vc_need_wrap = 0;
1036}
1037
1038static inline void cr(struct vc_data *vc)
1039{
1040 vc->vc_pos -= vc->vc_x << 1;
1041 vc->vc_need_wrap = vc->vc_x = 0;
1042}
1043
1044static inline void bs(struct vc_data *vc)
1045{
1046 if (vc->vc_x) {
1047 vc->vc_pos -= 2;
1048 vc->vc_x--;
1049 vc->vc_need_wrap = 0;
1050 }
1051}
1052
1053static inline void del(struct vc_data *vc)
1054{
1055 /* ignored */
1056}
1057
1058static void csi_J(struct vc_data *vc, int vpar)
1059{
1060 unsigned int count;
1061 unsigned short * start;
1062
1063 switch (vpar) {
1064 case 0: /* erase from cursor to end of display */
1065 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1066 start = (unsigned short *)vc->vc_pos;
1067 if (DO_UPDATE(vc)) {
1068 /* do in two stages */
1069 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1070 vc->vc_cols - vc->vc_x);
1071 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1072 vc->vc_rows - vc->vc_y - 1,
1073 vc->vc_cols);
1074 }
1075 break;
1076 case 1: /* erase from start to cursor */
1077 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1078 start = (unsigned short *)vc->vc_origin;
1079 if (DO_UPDATE(vc)) {
1080 /* do in two stages */
1081 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1082 vc->vc_cols);
1083 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1084 vc->vc_x + 1);
1085 }
1086 break;
1087 case 2: /* erase whole display */
1088 count = vc->vc_cols * vc->vc_rows;
1089 start = (unsigned short *)vc->vc_origin;
1090 if (DO_UPDATE(vc))
1091 vc->vc_sw->con_clear(vc, 0, 0,
1092 vc->vc_rows,
1093 vc->vc_cols);
1094 break;
1095 default:
1096 return;
1097 }
1098 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1099 vc->vc_need_wrap = 0;
1100}
1101
1102static void csi_K(struct vc_data *vc, int vpar)
1103{
1104 unsigned int count;
1105 unsigned short * start;
1106
1107 switch (vpar) {
1108 case 0: /* erase from cursor to end of line */
1109 count = vc->vc_cols - vc->vc_x;
1110 start = (unsigned short *)vc->vc_pos;
1111 if (DO_UPDATE(vc))
1112 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1113 vc->vc_cols - vc->vc_x);
1114 break;
1115 case 1: /* erase from start of line to cursor */
1116 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1117 count = vc->vc_x + 1;
1118 if (DO_UPDATE(vc))
1119 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1120 vc->vc_x + 1);
1121 break;
1122 case 2: /* erase whole line */
1123 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1124 count = vc->vc_cols;
1125 if (DO_UPDATE(vc))
1126 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1127 vc->vc_cols);
1128 break;
1129 default:
1130 return;
1131 }
1132 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1133 vc->vc_need_wrap = 0;
1134}
1135
1136static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1137{ /* not vt100? */
1138 int count;
1139
1140 if (!vpar)
1141 vpar++;
1142 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1143
1144 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1145 if (DO_UPDATE(vc))
1146 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1147 vc->vc_need_wrap = 0;
1148}
1149
1150static void default_attr(struct vc_data *vc)
1151{
1152 vc->vc_intensity = 1;
fa6ce9ab 1153 vc->vc_italic = 0;
1da177e4
LT		 1154 vc->vc_underline = 0;
1155 vc->vc_reverse = 0;
1156 vc->vc_blink = 0;
1157 vc->vc_color = vc->vc_def_color;
1158}
1159
1160/* console_sem is held */
1161static void csi_m(struct vc_data *vc)
1162{
1163 int i;
1164
1165 for (i = 0; i <= vc->vc_npar; i++)
1166 switch (vc->vc_par[i]) {
1167 case 0: /* all attributes off */
1168 default_attr(vc);
1169 break;
1170 case 1:
1171 vc->vc_intensity = 2;
1172 break;
1173 case 2:
1174 vc->vc_intensity = 0;
1175 break;
fa6ce9ab
JE		 1176 case 3:
1177 vc->vc_italic = 1;
1178 break;
1da177e4
LT		 1179 case 4:
1180 vc->vc_underline = 1;
1181 break;
1182 case 5:
1183 vc->vc_blink = 1;
1184 break;
1185 case 7:
1186 vc->vc_reverse = 1;
1187 break;
1188 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1189 * Select primary font, don't display
1190 * control chars if defined, don't set
1191 * bit 8 on output.
1192 */
1193 vc->vc_translate = set_translate(vc->vc_charset == 0
1194 ? vc->vc_G0_charset
1195 : vc->vc_G1_charset, vc);
1196 vc->vc_disp_ctrl = 0;
1197 vc->vc_toggle_meta = 0;
1198 break;
1199 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1200 * Select first alternate font, lets
1201 * chars < 32 be displayed as ROM chars.
1202 */
1203 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1204 vc->vc_disp_ctrl = 1;
1205 vc->vc_toggle_meta = 0;
1206 break;
1207 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1208 * Select second alternate font, toggle
1209 * high bit before displaying as ROM char.
1210 */
1211 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1212 vc->vc_disp_ctrl = 1;
1213 vc->vc_toggle_meta = 1;
1214 break;
1215 case 21:
1216 case 22:
1217 vc->vc_intensity = 1;
1218 break;
fa6ce9ab
JE		 1219 case 23:
1220 vc->vc_italic = 0;
1221 break;
1da177e4
LT		 1222 case 24:
1223 vc->vc_underline = 0;
1224 break;
1225 case 25:
1226 vc->vc_blink = 0;
1227 break;
1228 case 27:
1229 vc->vc_reverse = 0;
1230 break;
1231 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1232 * Enables underscore, white foreground
1233 * with white underscore (Linux - use
1234 * default foreground).
1235 */
1236 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1237 vc->vc_underline = 1;
1238 break;
1239 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1240 * Disable underline option.
1241 * Reset colour to default? It did this
1242 * before...
1243 */
1244 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1245 vc->vc_underline = 0;
1246 break;
1247 case 49:
1248 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1249 break;
1250 default:
1251 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1252 vc->vc_color = color_table[vc->vc_par[i] - 30]
1253 | (vc->vc_color & 0xf0);
1254 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1255 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1256 | (vc->vc_color & 0x0f);
1257 break;
1258 }
1259 update_attr(vc);
1260}
1261
1262static void respond_string(const char *p, struct tty_struct *tty)
1263{
1264 while (*p) {
1265 tty_insert_flip_char(tty, *p, 0);
1266 p++;
1267 }
1268 con_schedule_flip(tty);
1269}
1270
1271static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1272{
1273 char buf[40];
1274
1275 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1276 respond_string(buf, tty);
1277}
1278
1279static inline void status_report(struct tty_struct *tty)
1280{
1281 respond_string("\033[0n", tty); /* Terminal ok */
1282}
1283
1284static inline void respond_ID(struct tty_struct * tty)
1285{
1286 respond_string(VT102ID, tty);
1287}
1288
1289void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1290{
1291 char buf[8];
1292
1293 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1294 (char)('!' + mry));
1295 respond_string(buf, tty);
1296}
1297
1298/* invoked via ioctl(TIOCLINUX) and through set_selection */
1299int mouse_reporting(void)
1300{
1301 return vc_cons[fg_console].d->vc_report_mouse;
1302}
1303
1304/* console_sem is held */
1305static void set_mode(struct vc_data *vc, int on_off)
1306{
1307 int i;
1308
1309 for (i = 0; i <= vc->vc_npar; i++)
1310 if (vc->vc_ques) {
1311 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1312 case 1: /* Cursor keys send ^[Ox/^[[x */
1313 if (on_off)
1314 set_kbd(vc, decckm);
1315 else
1316 clr_kbd(vc, decckm);
1317 break;
1318 case 3: /* 80/132 mode switch unimplemented */
1319 vc->vc_deccolm = on_off;
1320#if 0
1321 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1322 /* this alone does not suffice; some user mode
1323 utility has to change the hardware regs */
1324#endif
1325 break;
1326 case 5: /* Inverted screen on/off */
1327 if (vc->vc_decscnm != on_off) {
1328 vc->vc_decscnm = on_off;
1329 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1330 update_attr(vc);
1331 }
1332 break;
1333 case 6: /* Origin relative/absolute */
1334 vc->vc_decom = on_off;
1335 gotoxay(vc, 0, 0);
1336 break;
1337 case 7: /* Autowrap on/off */
1338 vc->vc_decawm = on_off;
1339 break;
1340 case 8: /* Autorepeat on/off */
1341 if (on_off)
1342 set_kbd(vc, decarm);
1343 else
1344 clr_kbd(vc, decarm);
1345 break;
1346 case 9:
1347 vc->vc_report_mouse = on_off ? 1 : 0;
1348 break;
1349 case 25: /* Cursor on/off */
1350 vc->vc_deccm = on_off;
1351 break;
1352 case 1000:
1353 vc->vc_report_mouse = on_off ? 2 : 0;
1354 break;
1355 }
1356 } else {
1357 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1358 case 3: /* Monitor (display ctrls) */
1359 vc->vc_disp_ctrl = on_off;
1360 break;
1361 case 4: /* Insert Mode on/off */
1362 vc->vc_decim = on_off;
1363 break;
1364 case 20: /* Lf, Enter == CrLf/Lf */
1365 if (on_off)
1366 set_kbd(vc, lnm);
1367 else
1368 clr_kbd(vc, lnm);
1369 break;
1370 }
1371 }
1372}
1373
1374/* console_sem is held */
1375static void setterm_command(struct vc_data *vc)
1376{
1377 switch(vc->vc_par[0]) {
1378 case 1: /* set color for underline mode */
1379 if (vc->vc_can_do_color &&
1380 vc->vc_par[1] < 16) {
1381 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1382 if (vc->vc_underline)
1383 update_attr(vc);
1384 }
1385 break;
1386 case 2: /* set color for half intensity mode */
1387 if (vc->vc_can_do_color &&
1388 vc->vc_par[1] < 16) {
1389 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1390 if (vc->vc_intensity == 0)
1391 update_attr(vc);
1392 }
1393 break;
1394 case 8: /* store colors as defaults */
1395 vc->vc_def_color = vc->vc_attr;
1396 if (vc->vc_hi_font_mask == 0x100)
1397 vc->vc_def_color >>= 1;
1398 default_attr(vc);
1399 update_attr(vc);
1400 break;
1401 case 9: /* set blanking interval */
1402 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1403 poke_blanked_console();
1404 break;
1405 case 10: /* set bell frequency in Hz */
1406 if (vc->vc_npar >= 1)
1407 vc->vc_bell_pitch = vc->vc_par[1];
1408 else
1409 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1410 break;
1411 case 11: /* set bell duration in msec */
1412 if (vc->vc_npar >= 1)
1413 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1414 vc->vc_par[1] * HZ / 1000 : 0;
1415 else
1416 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1417 break;
1418 case 12: /* bring specified console to the front */
1419 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1420 set_console(vc->vc_par[1] - 1);
1421 break;
1422 case 13: /* unblank the screen */
1423 poke_blanked_console();
1424 break;
1425 case 14: /* set vesa powerdown interval */
1426 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1427 break;
1428 case 15: /* activate the previous console */
1429 set_console(last_console);
1430 break;
1431 }
1432}
1433
1434/* console_sem is held */
1435static void csi_at(struct vc_data *vc, unsigned int nr)
1436{
1437 if (nr > vc->vc_cols - vc->vc_x)
1438 nr = vc->vc_cols - vc->vc_x;
1439 else if (!nr)
1440 nr = 1;
1441 insert_char(vc, nr);
1442}
1443
1444/* console_sem is held */
1445static void csi_L(struct vc_data *vc, unsigned int nr)
1446{
1447 if (nr > vc->vc_rows - vc->vc_y)
1448 nr = vc->vc_rows - vc->vc_y;
1449 else if (!nr)
1450 nr = 1;
1451 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1452 vc->vc_need_wrap = 0;
1453}
1454
1455/* console_sem is held */
1456static void csi_P(struct vc_data *vc, unsigned int nr)
1457{
1458 if (nr > vc->vc_cols - vc->vc_x)
1459 nr = vc->vc_cols - vc->vc_x;
1460 else if (!nr)
1461 nr = 1;
1462 delete_char(vc, nr);
1463}
1464
1465/* console_sem is held */
1466static void csi_M(struct vc_data *vc, unsigned int nr)
1467{
1468 if (nr > vc->vc_rows - vc->vc_y)
1469 nr = vc->vc_rows - vc->vc_y;
1470 else if (!nr)
1471 nr=1;
1472 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1473 vc->vc_need_wrap = 0;
1474}
1475
1476/* console_sem is held (except via vc_init->reset_terminal */
1477static void save_cur(struct vc_data *vc)
1478{
1479 vc->vc_saved_x = vc->vc_x;
1480 vc->vc_saved_y = vc->vc_y;
1481 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1482 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1483 vc->vc_s_underline = vc->vc_underline;
1484 vc->vc_s_blink = vc->vc_blink;
1485 vc->vc_s_reverse = vc->vc_reverse;
1486 vc->vc_s_charset = vc->vc_charset;
1487 vc->vc_s_color = vc->vc_color;
1488 vc->vc_saved_G0 = vc->vc_G0_charset;
1489 vc->vc_saved_G1 = vc->vc_G1_charset;
1490}
1491
1492/* console_sem is held */
1493static void restore_cur(struct vc_data *vc)
1494{
1495 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1496 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1497 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1498 vc->vc_underline = vc->vc_s_underline;
1499 vc->vc_blink = vc->vc_s_blink;
1500 vc->vc_reverse = vc->vc_s_reverse;
1501 vc->vc_charset = vc->vc_s_charset;
1502 vc->vc_color = vc->vc_s_color;
1503 vc->vc_G0_charset = vc->vc_saved_G0;
1504 vc->vc_G1_charset = vc->vc_saved_G1;
1505 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1506 update_attr(vc);
1507 vc->vc_need_wrap = 0;
1508}
1509
1510enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1511 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1512 ESpalette };
1513
1514/* console_sem is held (except via vc_init()) */
1515static void reset_terminal(struct vc_data *vc, int do_clear)
1516{
1517 vc->vc_top = 0;
1518 vc->vc_bottom = vc->vc_rows;
1519 vc->vc_state = ESnormal;
1520 vc->vc_ques = 0;
1521 vc->vc_translate = set_translate(LAT1_MAP, vc);
1522 vc->vc_G0_charset = LAT1_MAP;
1523 vc->vc_G1_charset = GRAF_MAP;
1524 vc->vc_charset = 0;
1525 vc->vc_need_wrap = 0;
1526 vc->vc_report_mouse = 0;
042f10ec 1527 vc->vc_utf = default_utf8;
1da177e4
LT		 1528 vc->vc_utf_count = 0;
1529
1530 vc->vc_disp_ctrl = 0;
1531 vc->vc_toggle_meta = 0;
1532
1533 vc->vc_decscnm = 0;
1534 vc->vc_decom = 0;
1535 vc->vc_decawm = 1;
1536 vc->vc_deccm = 1;
1537 vc->vc_decim = 0;
1538
1539 set_kbd(vc, decarm);
1540 clr_kbd(vc, decckm);
1541 clr_kbd(vc, kbdapplic);
1542 clr_kbd(vc, lnm);
1543 kbd_table[vc->vc_num].lockstate = 0;
1544 kbd_table[vc->vc_num].slockstate = 0;
1545 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1546 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1547 /* do not do set_leds here because this causes an endless tasklet loop
1548 when the keyboard hasn't been initialized yet */
1549
1550 vc->vc_cursor_type = CUR_DEFAULT;
1551 vc->vc_complement_mask = vc->vc_s_complement_mask;
1552
1553 default_attr(vc);
1554 update_attr(vc);
1555
1556 vc->vc_tab_stop[0] = 0x01010100;
1557 vc->vc_tab_stop[1] =
1558 vc->vc_tab_stop[2] =
1559 vc->vc_tab_stop[3] =
1560 vc->vc_tab_stop[4] = 0x01010101;
1561
1562 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1563 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1564
1565 gotoxy(vc, 0, 0);
1566 save_cur(vc);
1567 if (do_clear)
1568 csi_J(vc, 2);
1569}
1570
1571/* console_sem is held */
1572static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1573{
1574 /*
1575 * Control characters can be used in the _middle_
1576 * of an escape sequence.
1577 */
1578 switch (c) {
1579 case 0:
1580 return;
1581 case 7:
1582 if (vc->vc_bell_duration)
1583 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1584 return;
1585 case 8:
1586 bs(vc);
1587 return;
1588 case 9:
1589 vc->vc_pos -= (vc->vc_x << 1);
1590 while (vc->vc_x < vc->vc_cols - 1) {
1591 vc->vc_x++;
1592 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1593 break;
1594 }
1595 vc->vc_pos += (vc->vc_x << 1);
1596 return;
1597 case 10: case 11: case 12:
1598 lf(vc);
1599 if (!is_kbd(vc, lnm))
1600 return;
1601 case 13:
1602 cr(vc);
1603 return;
1604 case 14:
1605 vc->vc_charset = 1;
1606 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1607 vc->vc_disp_ctrl = 1;
1608 return;
1609 case 15:
1610 vc->vc_charset = 0;
1611 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1612 vc->vc_disp_ctrl = 0;
1613 return;
1614 case 24: case 26:
1615 vc->vc_state = ESnormal;
1616 return;
1617 case 27:
1618 vc->vc_state = ESesc;
1619 return;
1620 case 127:
1621 del(vc);
1622 return;
1623 case 128+27:
1624 vc->vc_state = ESsquare;
1625 return;
1626 }
1627 switch(vc->vc_state) {
1628 case ESesc:
1629 vc->vc_state = ESnormal;
1630 switch (c) {
1631 case '[':
1632 vc->vc_state = ESsquare;
1633 return;
1634 case ']':
1635 vc->vc_state = ESnonstd;
1636 return;
1637 case '%':
1638 vc->vc_state = ESpercent;
1639 return;
1640 case 'E':
1641 cr(vc);
1642 lf(vc);
1643 return;
1644 case 'M':
1645 ri(vc);
1646 return;
1647 case 'D':
1648 lf(vc);
1649 return;
1650 case 'H':
1651 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1652 return;
1653 case 'Z':
1654 respond_ID(tty);
1655 return;
1656 case '7':
1657 save_cur(vc);
1658 return;
1659 case '8':
1660 restore_cur(vc);
1661 return;
1662 case '(':
1663 vc->vc_state = ESsetG0;
1664 return;
1665 case ')':
1666 vc->vc_state = ESsetG1;
1667 return;
1668 case '#':
1669 vc->vc_state = EShash;
1670 return;
1671 case 'c':
1672 reset_terminal(vc, 1);
1673 return;
1674 case '>': /* Numeric keypad */
1675 clr_kbd(vc, kbdapplic);
1676 return;
1677 case '=': /* Appl. keypad */
1678 set_kbd(vc, kbdapplic);
1679 return;
1680 }
1681 return;
1682 case ESnonstd:
1683 if (c=='P') { /* palette escape sequence */
1684 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1685 vc->vc_par[vc->vc_npar] = 0;
1686 vc->vc_npar = 0;
1687 vc->vc_state = ESpalette;
1688 return;
1689 } else if (c=='R') { /* reset palette */
1690 reset_palette(vc);
1691 vc->vc_state = ESnormal;
1692 } else
1693 vc->vc_state = ESnormal;
1694 return;
1695 case ESpalette:
1696 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1697 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1698 if (vc->vc_npar == 7) {
1699 int i = vc->vc_par[0] * 3, j = 1;
1700 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1701 vc->vc_palette[i++] += vc->vc_par[j++];
1702 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1703 vc->vc_palette[i++] += vc->vc_par[j++];
1704 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1705 vc->vc_palette[i] += vc->vc_par[j];
1706 set_palette(vc);
1707 vc->vc_state = ESnormal;
1708 }
1709 } else
1710 vc->vc_state = ESnormal;
1711 return;
1712 case ESsquare:
1713 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1714 vc->vc_par[vc->vc_npar] = 0;
1715 vc->vc_npar = 0;
1716 vc->vc_state = ESgetpars;
1717 if (c == '[') { /* Function key */
1718 vc->vc_state=ESfunckey;
1719 return;
1720 }
1721 vc->vc_ques = (c == '?');
1722 if (vc->vc_ques)
1723 return;
1724 case ESgetpars:
1725 if (c == ';' && vc->vc_npar < NPAR - 1) {
1726 vc->vc_npar++;
1727 return;
1728 } else if (c>='0' && c<='9') {
1729 vc->vc_par[vc->vc_npar] *= 10;
1730 vc->vc_par[vc->vc_npar] += c - '0';
1731 return;
1732 } else
1733 vc->vc_state = ESgotpars;
1734 case ESgotpars:
1735 vc->vc_state = ESnormal;
1736 switch(c) {
1737 case 'h':
1738 set_mode(vc, 1);
1739 return;
1740 case 'l':
1741 set_mode(vc, 0);
1742 return;
1743 case 'c':
1744 if (vc->vc_ques) {
1745 if (vc->vc_par[0])
1746 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1747 else
1748 vc->vc_cursor_type = CUR_DEFAULT;
1749 return;
1750 }
1751 break;
1752 case 'm':
1753 if (vc->vc_ques) {
1754 clear_selection();
1755 if (vc->vc_par[0])
1756 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1757 else
1758 vc->vc_complement_mask = vc->vc_s_complement_mask;
1759 return;
1760 }
1761 break;
1762 case 'n':
1763 if (!vc->vc_ques) {
1764 if (vc->vc_par[0] == 5)
1765 status_report(tty);
1766 else if (vc->vc_par[0] == 6)
1767 cursor_report(vc, tty);
1768 }
1769 return;
1770 }
1771 if (vc->vc_ques) {
1772 vc->vc_ques = 0;
1773 return;
1774 }
1775 switch(c) {
1776 case 'G': case '`':
1777 if (vc->vc_par[0])
1778 vc->vc_par[0]--;
1779 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1780 return;
1781 case 'A':
1782 if (!vc->vc_par[0])
1783 vc->vc_par[0]++;
1784 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1785 return;
1786 case 'B': case 'e':
1787 if (!vc->vc_par[0])
1788 vc->vc_par[0]++;
1789 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1790 return;
1791 case 'C': case 'a':
1792 if (!vc->vc_par[0])
1793 vc->vc_par[0]++;
1794 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1795 return;
1796 case 'D':
1797 if (!vc->vc_par[0])
1798 vc->vc_par[0]++;
1799 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1800 return;
1801 case 'E':
1802 if (!vc->vc_par[0])
1803 vc->vc_par[0]++;
1804 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1805 return;
1806 case 'F':
1807 if (!vc->vc_par[0])
1808 vc->vc_par[0]++;
1809 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1810 return;
1811 case 'd':
1812 if (vc->vc_par[0])
1813 vc->vc_par[0]--;
1814 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1815 return;
1816 case 'H': case 'f':
1817 if (vc->vc_par[0])
1818 vc->vc_par[0]--;
1819 if (vc->vc_par[1])
1820 vc->vc_par[1]--;
1821 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1822 return;
1823 case 'J':
1824 csi_J(vc, vc->vc_par[0]);
1825 return;
1826 case 'K':
1827 csi_K(vc, vc->vc_par[0]);
1828 return;
1829 case 'L':
1830 csi_L(vc, vc->vc_par[0]);
1831 return;
1832 case 'M':
1833 csi_M(vc, vc->vc_par[0]);
1834 return;
1835 case 'P':
1836 csi_P(vc, vc->vc_par[0]);
1837 return;
1838 case 'c':
1839 if (!vc->vc_par[0])
1840 respond_ID(tty);
1841 return;
1842 case 'g':
1843 if (!vc->vc_par[0])
1844 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1845 else if (vc->vc_par[0] == 3) {
1846 vc->vc_tab_stop[0] =
1847 vc->vc_tab_stop[1] =
1848 vc->vc_tab_stop[2] =
1849 vc->vc_tab_stop[3] =
1850 vc->vc_tab_stop[4] = 0;
1851 }
1852 return;
1853 case 'm':
1854 csi_m(vc);
1855 return;
1856 case 'q': /* DECLL - but only 3 leds */
1857 /* map 0,1,2,3 to 0,1,2,4 */
1858 if (vc->vc_par[0] < 4)
1859 setledstate(kbd_table + vc->vc_num,
1860 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1861 return;
1862 case 'r':
1863 if (!vc->vc_par[0])
1864 vc->vc_par[0]++;
1865 if (!vc->vc_par[1])
1866 vc->vc_par[1] = vc->vc_rows;
1867 /* Minimum allowed region is 2 lines */
1868 if (vc->vc_par[0] < vc->vc_par[1] &&
1869 vc->vc_par[1] <= vc->vc_rows) {
1870 vc->vc_top = vc->vc_par[0] - 1;
1871 vc->vc_bottom = vc->vc_par[1];
1872 gotoxay(vc, 0, 0);
1873 }
1874 return;
1875 case 's':
1876 save_cur(vc);
1877 return;
1878 case 'u':
1879 restore_cur(vc);
1880 return;
1881 case 'X':
1882 csi_X(vc, vc->vc_par[0]);
1883 return;
1884 case '@':
1885 csi_at(vc, vc->vc_par[0]);
1886 return;
1887 case ']': /* setterm functions */
1888 setterm_command(vc);
1889 return;
1890 }
1891 return;
1892 case ESpercent:
1893 vc->vc_state = ESnormal;
1894 switch (c) {
1895 case '@': /* defined in ISO 2022 */
1896 vc->vc_utf = 0;
1897 return;
1898 case 'G': /* prelim official escape code */
1899 case '8': /* retained for compatibility */
1900 vc->vc_utf = 1;
1901 return;
1902 }
1903 return;
1904 case ESfunckey:
1905 vc->vc_state = ESnormal;
1906 return;
1907 case EShash:
1908 vc->vc_state = ESnormal;
1909 if (c == '8') {
1910 /* DEC screen alignment test. kludge :-) */
1911 vc->vc_video_erase_char =
1912 (vc->vc_video_erase_char & 0xff00) | 'E';
1913 csi_J(vc, 2);
1914 vc->vc_video_erase_char =
1915 (vc->vc_video_erase_char & 0xff00) | ' ';
1916 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1917 }
1918 return;
1919 case ESsetG0:
1920 if (c == '0')
1921 vc->vc_G0_charset = GRAF_MAP;
1922 else if (c == 'B')
1923 vc->vc_G0_charset = LAT1_MAP;
1924 else if (c == 'U')
1925 vc->vc_G0_charset = IBMPC_MAP;
1926 else if (c == 'K')
1927 vc->vc_G0_charset = USER_MAP;
1928 if (vc->vc_charset == 0)
1929 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1930 vc->vc_state = ESnormal;
1931 return;
1932 case ESsetG1:
1933 if (c == '0')
1934 vc->vc_G1_charset = GRAF_MAP;
1935 else if (c == 'B')
1936 vc->vc_G1_charset = LAT1_MAP;
1937 else if (c == 'U')
1938 vc->vc_G1_charset = IBMPC_MAP;
1939 else if (c == 'K')
1940 vc->vc_G1_charset = USER_MAP;
1941 if (vc->vc_charset == 1)
1942 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1943 vc->vc_state = ESnormal;
1944 return;
1945 default:
1946 vc->vc_state = ESnormal;
1947 }
1948}
1949
1950/* This is a temporary buffer used to prepare a tty console write
1951 * so that we can easily avoid touching user space while holding the
1952 * console spinlock. It is allocated in con_init and is shared by
1953 * this code and the vc_screen read/write tty calls.
1954 *
1955 * We have to allocate this statically in the kernel data section
1956 * since console_init (and thus con_init) are called before any
1957 * kernel memory allocation is available.
1958 */
1959char con_buf[CON_BUF_SIZE];
c831c338 1960DEFINE_MUTEX(con_buf_mtx);
1da177e4 1961
2f1a2ccb 1962/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 1963 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 1964 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1965 */
1966struct interval {
1967 uint32_t first;
1968 uint32_t last;
1969};
1970
1971static int bisearch(uint32_t ucs, const struct interval *table, int max)
1972{
1973 int min = 0;
1974 int mid;
1975
1976 if (ucs < table[0].first || ucs > table[max].last)
1977 return 0;
1978 while (max >= min) {
1979 mid = (min + max) / 2;
1980 if (ucs > table[mid].last)
1981 min = mid + 1;
1982 else if (ucs < table[mid].first)
1983 max = mid - 1;
1984 else
1985 return 1;
1986 }
1987 return 0;
1988}
1989
1990static int is_double_width(uint32_t ucs)
1991{
1992 static const struct interval double_width[] = {
1993 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1994 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 1995 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
1996 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 1997 };
0f11541b 1998 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 1999}
2000
1da177e4
LT		 2001/* acquires console_sem */
2002static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2003{
2004#ifdef VT_BUF_VRAM_ONLY
2005#define FLUSH do { } while(0);
2006#else
2007#define FLUSH if (draw_x >= 0) { \
2008 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2009 draw_x = -1; \
2010 }
2011#endif
2012
2013 int c, tc, ok, n = 0, draw_x = -1;
2014 unsigned int currcons;
2015 unsigned long draw_from = 0, draw_to = 0;
2016 struct vc_data *vc;
2f1a2ccb
EK		 2017 unsigned char vc_attr;
2018 uint8_t rescan;
2019 uint8_t inverse;
2020 uint8_t width;
1da177e4
LT		 2021 u16 himask, charmask;
2022 const unsigned char *orig_buf = NULL;
2023 int orig_count;
2024
2025 if (in_interrupt())
2026 return count;
2027
2028 might_sleep();
2029
2030 acquire_console_sem();
2031 vc = tty->driver_data;
2032 if (vc == NULL) {
2033 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2034 release_console_sem();
2035 return 0;
2036 }
2037
2038 currcons = vc->vc_num;
2039 if (!vc_cons_allocated(currcons)) {
2040 /* could this happen? */
2041 static int error = 0;
2042 if (!error) {
2043 error = 1;
2044 printk("con_write: tty %d not allocated\n", currcons+1);
2045 }
2046 release_console_sem();
2047 return 0;
2048 }
2049 release_console_sem();
2050
2051 orig_buf = buf;
2052 orig_count = count;
2053
2054 /* At this point 'buf' is guaranteed to be a kernel buffer
2055 * and therefore no access to userspace (and therefore sleeping)
c831c338 2056 * will be needed. The con_buf_mtx serializes all tty based
1da177e4
LT		 2057 * console rendering and vcs write/read operations. We hold
2058 * the console spinlock during the entire write.
2059 */
2060
2061 acquire_console_sem();
2062
2063 vc = tty->driver_data;
2064 if (vc == NULL) {
2065 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2066 release_console_sem();
2067 goto out;
2068 }
2069
2070 himask = vc->vc_hi_font_mask;
2071 charmask = himask ? 0x1ff : 0xff;
2072
2073 /* undraw cursor first */
2074 if (IS_FG(vc))
2075 hide_cursor(vc);
2076
2077 while (!tty->stopped && count) {
2078 int orig = *buf;
2079 c = orig;
2080 buf++;
2081 n++;
2082 count--;
2f1a2ccb
EK		 2083 rescan = 0;
2084 inverse = 0;
2085 width = 1;
1da177e4
LT		 2086
2087 /* Do no translation at all in control states */
2088 if (vc->vc_state != ESnormal) {
2089 tc = c;
d4328b40 2090 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2091 /* Combine UTF-8 into Unicode in vc_utf_char.
2092 * vc_utf_count is the number of continuation bytes still
2093 * expected to arrive.
2094 * vc_npar is the number of continuation bytes arrived so
2095 * far
2096 */
d4328b40 2097rescan_last_byte:
2f1a2ccb
EK		 2098 if ((c & 0xc0) == 0x80) {
2099 /* Continuation byte received */
2100 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2101 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2102 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2103 vc->vc_npar++;
2104 if (--vc->vc_utf_count) {
2105 /* Still need some bytes */
1da177e4 2106 continue;
2f1a2ccb
EK		 2107 }
2108 /* Got a whole character */
2109 c = vc->vc_utf_char;
2110 /* Reject overlong sequences */
2111 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2112 c > utf8_length_changes[vc->vc_npar])
2113 c = 0xfffd;
2114 } else {
2115 /* Unexpected continuation byte */
2116 vc->vc_utf_count = 0;
2117 c = 0xfffd;
2118 }
1da177e4 2119 } else {
2f1a2ccb
EK		 2120 /* Single ASCII byte or first byte of a sequence received */
2121 if (vc->vc_utf_count) {
2122 /* Continuation byte expected */
2123 rescan = 1;
2124 vc->vc_utf_count = 0;
2125 c = 0xfffd;
2126 } else if (c > 0x7f) {
2127 /* First byte of a multibyte sequence received */
2128 vc->vc_npar = 0;
2129 if ((c & 0xe0) == 0xc0) {
2130 vc->vc_utf_count = 1;
2131 vc->vc_utf_char = (c & 0x1f);
2132 } else if ((c & 0xf0) == 0xe0) {
2133 vc->vc_utf_count = 2;
2134 vc->vc_utf_char = (c & 0x0f);
2135 } else if ((c & 0xf8) == 0xf0) {
2136 vc->vc_utf_count = 3;
2137 vc->vc_utf_char = (c & 0x07);
2138 } else if ((c & 0xfc) == 0xf8) {
2139 vc->vc_utf_count = 4;
2140 vc->vc_utf_char = (c & 0x03);
2141 } else if ((c & 0xfe) == 0xfc) {
2142 vc->vc_utf_count = 5;
2143 vc->vc_utf_char = (c & 0x01);
2144 } else {
2145 /* 254 and 255 are invalid */
2146 c = 0xfffd;
2147 }
2148 if (vc->vc_utf_count) {
2149 /* Still need some bytes */
2150 continue;
2151 }
2152 }
2153 /* Nothing to do if an ASCII byte was received */
1da177e4 2154 }
2f1a2ccb
EK		 2155 /* End of UTF-8 decoding. */
2156 /* c is the received character, or U+FFFD for invalid sequences. */
2157 /* Replace invalid Unicode code points with U+FFFD too */
2158 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2159 c = 0xfffd;
2160 tc = c;
d4328b40 2161 } else { /* no utf or alternate charset mode */
2f1a2ccb 2162 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
1da177e4
LT		 2163 }
2164
2165 /* If the original code was a control character we
2166 * only allow a glyph to be displayed if the code is
2167 * not normally used (such as for cursor movement) or
2168 * if the disp_ctrl mode has been explicitly enabled.
2169 * Certain characters (as given by the CTRL_ALWAYS
2170 * bitmap) are always displayed as control characters,
2171 * as the console would be pretty useless without
2172 * them; to display an arbitrary font position use the
2173 * direct-to-font zone in UTF-8 mode.
2174 */
2175 ok = tc && (c >= 32 ||
d4328b40
AT		 2176 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2177 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2178 && (c != 127 || vc->vc_disp_ctrl)
2179 && (c != 128+27);
2180
2181 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2182 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2183 if (is_double_width(c))
2184 width = 2;
2185 }
1da177e4
LT		 2186 /* Now try to find out how to display it */
2187 tc = conv_uni_to_pc(vc, tc);
d4328b40 2188 if (tc & ~charmask) {
2f1a2ccb
EK		 2189 if (tc == -1 || tc == -2) {
2190 continue; /* nothing to display */
2191 }
2192 /* Glyph not found */
1ed8a2b3 2193 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2194 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2195 This would make absolutely no sense with Unicode in mind,
2196 but do this for ASCII characters since a font may lack
2197 Unicode mapping info and we don't want to end up with
2198 having question marks only. */
2f1a2ccb
EK		 2199 tc = c;
2200 } else {
2201 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2202 tc = conv_uni_to_pc(vc, 0xfffd);
2203 if (tc < 0) {
2204 inverse = 1;
2205 tc = conv_uni_to_pc(vc, '?');
2206 if (tc < 0) tc = '?';
2207 }
2208 }
d4328b40 2209 }
1da177e4 2210
2f1a2ccb
EK		 2211 if (!inverse) {
2212 vc_attr = vc->vc_attr;
1da177e4 2213 } else {
2f1a2ccb
EK		 2214 /* invert vc_attr */
2215 if (!vc->vc_can_do_color) {
2216 vc_attr = (vc->vc_attr) ^ 0x08;
2217 } else if (vc->vc_hi_font_mask == 0x100) {
2218 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2219 } else {
2220 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2221 }
1ed8a2b3 2222 FLUSH
1da177e4 2223 }
2f1a2ccb
EK		 2224
2225 while (1) {
2226 if (vc->vc_need_wrap || vc->vc_decim)
2227 FLUSH
2228 if (vc->vc_need_wrap) {
2229 cr(vc);
2230 lf(vc);
2231 }
2232 if (vc->vc_decim)
2233 insert_char(vc, 1);
2234 scr_writew(himask ?
2235 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2236 (vc_attr << 8) + tc,
2237 (u16 *) vc->vc_pos);
2238 if (DO_UPDATE(vc) && draw_x < 0) {
2239 draw_x = vc->vc_x;
2240 draw_from = vc->vc_pos;
2241 }
2242 if (vc->vc_x == vc->vc_cols - 1) {
2243 vc->vc_need_wrap = vc->vc_decawm;
2244 draw_to = vc->vc_pos + 2;
2245 } else {
2246 vc->vc_x++;
2247 draw_to = (vc->vc_pos += 2);
d4328b40 2248 }
2f1a2ccb
EK		 2249
2250 if (!--width) break;
2251
2252 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2253 if (tc < 0) tc = ' ';
2254 }
2255
1ed8a2b3
EK		 2256 if (inverse) {
2257 FLUSH
2258 }
2259
2f1a2ccb
EK		 2260 if (rescan) {
2261 rescan = 0;
2262 inverse = 0;
2263 width = 1;
d4328b40
AT		 2264 c = orig;
2265 goto rescan_last_byte;
2266 }
1da177e4
LT		 2267 continue;
2268 }
2269 FLUSH
2270 do_con_trol(tty, vc, orig);
2271 }
2272 FLUSH
2273 console_conditional_schedule();
2274 release_console_sem();
2275
2276out:
2277 return n;
2278#undef FLUSH
2279}
2280
2281/*
2282 * This is the console switching callback.
2283 *
2284 * Doing console switching in a process context allows
2285 * us to do the switches asynchronously (needed when we want
2286 * to switch due to a keyboard interrupt). Synchronization
2287 * with other console code and prevention of re-entrancy is
2288 * ensured with console_sem.
2289 */
65f27f38 2290static void console_callback(struct work_struct *ignored)
1da177e4
LT		 2291{
2292 acquire_console_sem();
2293
2294 if (want_console >= 0) {
2295 if (want_console != fg_console &&
2296 vc_cons_allocated(want_console)) {
2297 hide_cursor(vc_cons[fg_console].d);
2298 change_console(vc_cons[want_console].d);
2299 /* we only changed when the console had already
2300 been allocated - a new console is not created
2301 in an interrupt routine */
2302 }
2303 want_console = -1;
2304 }
2305 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2306 do_poke_blanked_console = 0;
2307 poke_blanked_console();
2308 }
2309 if (scrollback_delta) {
2310 struct vc_data *vc = vc_cons[fg_console].d;
2311 clear_selection();
2312 if (vc->vc_mode == KD_TEXT)
2313 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2314 scrollback_delta = 0;
2315 }
2316 if (blank_timer_expired) {
2317 do_blank_screen(0);
2318 blank_timer_expired = 0;
2319 }
2320
2321 release_console_sem();
2322}
2323
b257bc05 2324int set_console(int nr)
1da177e4 2325{
b257bc05
AJ		 2326 struct vc_data *vc = vc_cons[fg_console].d;
2327
2328 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2329 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2330
2331 /*
2332 * Console switch will fail in console_callback() or
2333 * change_console() so there is no point scheduling
2334 * the callback
2335 *
2336 * Existing set_console() users don't check the return
2337 * value so this shouldn't break anything
2338 */
2339 return -EINVAL;
2340 }
2341
1da177e4
LT		 2342 want_console = nr;
2343 schedule_console_callback();
b257bc05
AJ		 2344
2345 return 0;
1da177e4
LT		 2346}
2347
2348struct tty_driver *console_driver;
2349
2350#ifdef CONFIG_VT_CONSOLE
2351
2352/*
2353 * Console on virtual terminal
2354 *
2355 * The console must be locked when we get here.
2356 */
2357
2358static void vt_console_print(struct console *co, const char *b, unsigned count)
2359{
2360 struct vc_data *vc = vc_cons[fg_console].d;
2361 unsigned char c;
2362 static unsigned long printing;
2363 const ushort *start;
2364 ushort cnt = 0;
2365 ushort myx;
2366
2367 /* console busy or not yet initialized */
2368 if (!printable || test_and_set_bit(0, &printing))
2369 return;
2370
2371 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2372 vc = vc_cons[kmsg_redirect - 1].d;
2373
2374 /* read `x' only after setting currcons properly (otherwise
2375 the `x' macro will read the x of the foreground console). */
2376 myx = vc->vc_x;
2377
2378 if (!vc_cons_allocated(fg_console)) {
2379 /* impossible */
2380 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2381 goto quit;
2382 }
2383
2384 if (vc->vc_mode != KD_TEXT)
2385 goto quit;
2386
2387 /* undraw cursor first */
2388 if (IS_FG(vc))
2389 hide_cursor(vc);
2390
2391 start = (ushort *)vc->vc_pos;
2392
2393 /* Contrived structure to try to emulate original need_wrap behaviour
2394 * Problems caused when we have need_wrap set on '\n' character */
2395 while (count--) {
2396 c = *b++;
2397 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2398 if (cnt > 0) {
2399 if (CON_IS_VISIBLE(vc))
2400 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2401 vc->vc_x += cnt;
2402 if (vc->vc_need_wrap)
2403 vc->vc_x--;
2404 cnt = 0;
2405 }
2406 if (c == 8) { /* backspace */
2407 bs(vc);
2408 start = (ushort *)vc->vc_pos;
2409 myx = vc->vc_x;
2410 continue;
2411 }
2412 if (c != 13)
2413 lf(vc);
2414 cr(vc);
2415 start = (ushort *)vc->vc_pos;
2416 myx = vc->vc_x;
2417 if (c == 10 || c == 13)
2418 continue;
2419 }
2420 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2421 cnt++;
2422 if (myx == vc->vc_cols - 1) {
2423 vc->vc_need_wrap = 1;
2424 continue;
2425 }
2426 vc->vc_pos += 2;
2427 myx++;
2428 }
2429 if (cnt > 0) {
2430 if (CON_IS_VISIBLE(vc))
2431 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2432 vc->vc_x += cnt;
2433 if (vc->vc_x == vc->vc_cols) {
2434 vc->vc_x--;
2435 vc->vc_need_wrap = 1;
2436 }
2437 }
2438 set_cursor(vc);
2439
2440quit:
2441 clear_bit(0, &printing);
2442}
2443
2444static struct tty_driver *vt_console_device(struct console *c, int *index)
2445{
2446 *index = c->index ? c->index-1 : fg_console;
2447 return console_driver;
2448}
2449
2450static struct console vt_console_driver = {
2451 .name = "tty",
2452 .write = vt_console_print,
2453 .device = vt_console_device,
2454 .unblank = unblank_screen,
2455 .flags = CON_PRINTBUFFER,
2456 .index = -1,
2457};
2458#endif
2459
2460/*
2461 * Handling of Linux-specific VC ioctls
2462 */
2463
2464/*
2465 * Generally a bit racy with respect to console_sem().
2466 *
2467 * There are some functions which don't need it.
2468 *
2469 * There are some functions which can sleep for arbitrary periods
2470 * (paste_selection) but we don't need the lock there anyway.
2471 *
2472 * set_selection has locking, and definitely needs it
2473 */
2474
2475int tioclinux(struct tty_struct *tty, unsigned long arg)
2476{
2477 char type, data;
2478 char __user *p = (char __user *)arg;
2479 int lines;
2480 int ret;
2481
2482 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2483 return -EINVAL;
2484 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2485 return -EPERM;
2486 if (get_user(type, p))
2487 return -EFAULT;
2488 ret = 0;
2489 switch (type)
2490 {
2491 case TIOCL_SETSEL:
2492 acquire_console_sem();
2493 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2494 release_console_sem();
2495 break;
2496 case TIOCL_PASTESEL:
2497 ret = paste_selection(tty);
2498 break;
2499 case TIOCL_UNBLANKSCREEN:
2d237c63 2500 acquire_console_sem();
1da177e4 2501 unblank_screen();
2d237c63 2502 release_console_sem();
1da177e4
LT		 2503 break;
2504 case TIOCL_SELLOADLUT:
2505 ret = sel_loadlut(p);
2506 break;
2507 case TIOCL_GETSHIFTSTATE:
2508
2509 /*
2510 * Make it possible to react to Shift+Mousebutton.
2511 * Note that 'shift_state' is an undocumented
2512 * kernel-internal variable; programs not closely
2513 * related to the kernel should not use this.
2514 */
2515 data = shift_state;
2516 ret = __put_user(data, p);
2517 break;
2518 case TIOCL_GETMOUSEREPORTING:
2519 data = mouse_reporting();
2520 ret = __put_user(data, p);
2521 break;
2522 case TIOCL_SETVESABLANK:
403aac96 2523 ret = set_vesa_blanking(p);
1da177e4 2524 break;
0ca07731
RW		 2525 case TIOCL_GETKMSGREDIRECT:
2526 data = kmsg_redirect;
2527 ret = __put_user(data, p);
2528 break;
1da177e4
LT		 2529 case TIOCL_SETKMSGREDIRECT:
2530 if (!capable(CAP_SYS_ADMIN)) {
2531 ret = -EPERM;
2532 } else {
2533 if (get_user(data, p+1))
2534 ret = -EFAULT;
2535 else
2536 kmsg_redirect = data;
2537 }
2538 break;
2539 case TIOCL_GETFGCONSOLE:
2540 ret = fg_console;
2541 break;
2542 case TIOCL_SCROLLCONSOLE:
2543 if (get_user(lines, (s32 __user *)(p+4))) {
2544 ret = -EFAULT;
2545 } else {
2546 scrollfront(vc_cons[fg_console].d, lines);
2547 ret = 0;
2548 }
2549 break;
2550 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2551 acquire_console_sem();
1da177e4
LT		 2552 ignore_poke = 1;
2553 do_blank_screen(0);
2d237c63 2554 release_console_sem();
1da177e4
LT		 2555 break;
2556 case TIOCL_BLANKEDSCREEN:
2557 ret = console_blanked;
2558 break;
2559 default:
2560 ret = -EINVAL;
2561 break;
2562 }
2563 return ret;
2564}
2565
2566/*
2567 * /dev/ttyN handling
2568 */
2569
2570static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2571{
2572 int retval;
2573
2574 retval = do_con_write(tty, buf, count);
2575 con_flush_chars(tty);
2576
2577 return retval;
2578}
2579
2580static void con_put_char(struct tty_struct *tty, unsigned char ch)
2581{
2582 if (in_interrupt())
2583 return; /* n_r3964 calls put_char() from interrupt context */
2584 do_con_write(tty, &ch, 1);
2585}
2586
2587static int con_write_room(struct tty_struct *tty)
2588{
2589 if (tty->stopped)
2590 return 0;
2591 return 4096; /* No limit, really; we're not buffering */
2592}
2593
2594static int con_chars_in_buffer(struct tty_struct *tty)
2595{
2596 return 0; /* we're not buffering */
2597}
2598
2599/*
2600 * con_throttle and con_unthrottle are only used for
2601 * paste_selection(), which has to stuff in a large number of
2602 * characters...
2603 */
2604static void con_throttle(struct tty_struct *tty)
2605{
2606}
2607
2608static void con_unthrottle(struct tty_struct *tty)
2609{
2610 struct vc_data *vc = tty->driver_data;
2611
2612 wake_up_interruptible(&vc->paste_wait);
2613}
2614
2615/*
2616 * Turn the Scroll-Lock LED on when the tty is stopped
2617 */
2618static void con_stop(struct tty_struct *tty)
2619{
2620 int console_num;
2621 if (!tty)
2622 return;
2623 console_num = tty->index;
2624 if (!vc_cons_allocated(console_num))
2625 return;
2626 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2627 set_leds();
2628}
2629
2630/*
2631 * Turn the Scroll-Lock LED off when the console is started
2632 */
2633static void con_start(struct tty_struct *tty)
2634{
2635 int console_num;
2636 if (!tty)
2637 return;
2638 console_num = tty->index;
2639 if (!vc_cons_allocated(console_num))
2640 return;
2641 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2642 set_leds();
2643}
2644
2645static void con_flush_chars(struct tty_struct *tty)
2646{
2647 struct vc_data *vc;
2648
2649 if (in_interrupt()) /* from flush_to_ldisc */
2650 return;
2651
2652 /* if we race with con_close(), vt may be null */
2653 acquire_console_sem();
2654 vc = tty->driver_data;
2655 if (vc)
2656 set_cursor(vc);
2657 release_console_sem();
2658}
2659
2660/*
2661 * Allocate the console screen memory.
2662 */
2663static int con_open(struct tty_struct *tty, struct file *filp)
2664{
2665 unsigned int currcons = tty->index;
2666 int ret = 0;
2667
2668 acquire_console_sem();
f786648b 2669 if (tty->driver_data == NULL) {
1da177e4
LT		 2670 ret = vc_allocate(currcons);
2671 if (ret == 0) {
2672 struct vc_data *vc = vc_cons[currcons].d;
2673 tty->driver_data = vc;
2674 vc->vc_tty = tty;
2675
2676 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2677 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2678 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2679 }
2680 release_console_sem();
d09d7ddf 2681 vcs_make_sysfs(tty);
1da177e4
LT		 2682 return ret;
2683 }
2684 }
2685 release_console_sem();
2686 return ret;
2687}
2688
2689/*
70522e12 2690 * We take tty_mutex in here to prevent another thread from coming in via init_dev
1da177e4
LT		 2691 * and taking a ref against the tty while we're in the process of forgetting
2692 * about it and cleaning things up.
2693 *
d09d7ddf 2694 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
1da177e4
LT		 2695 */
2696static void con_close(struct tty_struct *tty, struct file *filp)
2697{
70522e12 2698 mutex_lock(&tty_mutex);
1da177e4
LT		 2699 acquire_console_sem();
2700 if (tty && tty->count == 1) {
2701 struct vc_data *vc = tty->driver_data;
2702
2703 if (vc)
2704 vc->vc_tty = NULL;
2705 tty->driver_data = NULL;
2706 release_console_sem();
d09d7ddf 2707 vcs_remove_sysfs(tty);
70522e12 2708 mutex_unlock(&tty_mutex);
1da177e4 2709 /*
70522e12 2710 * tty_mutex is released, but we still hold BKL, so there is
1da177e4
LT		 2711 * still exclusion against init_dev()
2712 */
2713 return;
2714 }
2715 release_console_sem();
70522e12 2716 mutex_unlock(&tty_mutex);
1da177e4
LT		 2717}
2718
fa6ce9ab
JE		 2719static int default_italic_color = 2; // green (ASCII)
2720static int default_underline_color = 3; // cyan (ASCII)
2721module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2722module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2723
1da177e4
LT		 2724static void vc_init(struct vc_data *vc, unsigned int rows,
2725 unsigned int cols, int do_clear)
2726{
2727 int j, k ;
2728
2729 vc->vc_cols = cols;
2730 vc->vc_rows = rows;
2731 vc->vc_size_row = cols << 1;
2732 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2733
2734 set_origin(vc);
2735 vc->vc_pos = vc->vc_origin;
2736 reset_vc(vc);
2737 for (j=k=0; j<16; j++) {
2738 vc->vc_palette[k++] = default_red[j] ;
2739 vc->vc_palette[k++] = default_grn[j] ;
2740 vc->vc_palette[k++] = default_blu[j] ;
2741 }
2742 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2743 vc->vc_ulcolor = default_underline_color;
2744 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2745 vc->vc_halfcolor = 0x08; /* grey */
2746 init_waitqueue_head(&vc->paste_wait);
2747 reset_terminal(vc, do_clear);
2748}
2749
2750/*
2751 * This routine initializes console interrupts, and does nothing
2752 * else. If you want the screen to clear, call tty_write with
2753 * the appropriate escape-sequence.
2754 */
2755
2756static int __init con_init(void)
2757{
2758 const char *display_desc = NULL;
2759 struct vc_data *vc;
3e795de7 2760 unsigned int currcons = 0, i;
1da177e4
LT		 2761
2762 acquire_console_sem();
2763
2764 if (conswitchp)
2765 display_desc = conswitchp->con_startup();
2766 if (!display_desc) {
2767 fg_console = 0;
2768 release_console_sem();
2769 return 0;
2770 }
2771
3e795de7
AD		 2772 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2773 struct con_driver *con_driver = &registered_con_driver[i];
2774
2775 if (con_driver->con == NULL) {
2776 con_driver->con = conswitchp;
2777 con_driver->desc = display_desc;
2778 con_driver->flag = CON_DRIVER_FLAG_INIT;
2779 con_driver->first = 0;
2780 con_driver->last = MAX_NR_CONSOLES - 1;
2781 break;
2782 }
2783 }
2784
2785 for (i = 0; i < MAX_NR_CONSOLES; i++)
2786 con_driver_map[i] = conswitchp;
2787
1da177e4
LT		 2788 if (blankinterval) {
2789 blank_state = blank_normal_wait;
2790 mod_timer(&console_timer, jiffies + blankinterval);
2791 }
2792
2793 /*
2794 * kmalloc is not running yet - we use the bootmem allocator.
2795 */
2796 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2797 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
7f1f86a0 2798 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 2799 visual_init(vc, currcons, 1);
2800 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2801 vc->vc_kmalloced = 0;
2802 vc_init(vc, vc->vc_rows, vc->vc_cols,
2803 currcons || !vc->vc_sw->con_save_screen);
2804 }
2805 currcons = fg_console = 0;
2806 master_display_fg = vc = vc_cons[currcons].d;
2807 set_origin(vc);
2808 save_screen(vc);
2809 gotoxy(vc, vc->vc_x, vc->vc_y);
2810 csi_J(vc, 0);
2811 update_screen(vc);
2812 printk("Console: %s %s %dx%d",
2813 vc->vc_can_do_color ? "colour" : "mono",
2814 display_desc, vc->vc_cols, vc->vc_rows);
2815 printable = 1;
2816 printk("\n");
2817
2818 release_console_sem();
2819
2820#ifdef CONFIG_VT_CONSOLE
2821 register_console(&vt_console_driver);
2822#endif
2823 return 0;
2824}
2825console_initcall(con_init);
2826
b68e31d0 2827static const struct tty_operations con_ops = {
1da177e4
LT		 2828 .open = con_open,
2829 .close = con_close,
2830 .write = con_write,
2831 .write_room = con_write_room,
2832 .put_char = con_put_char,
2833 .flush_chars = con_flush_chars,
2834 .chars_in_buffer = con_chars_in_buffer,
2835 .ioctl = vt_ioctl,
2836 .stop = con_stop,
2837 .start = con_start,
2838 .throttle = con_throttle,
2839 .unthrottle = con_unthrottle,
2840};
2841
2842int __init vty_init(void)
2843{
2844 vcs_init();
2845
2846 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2847 if (!console_driver)
2848 panic("Couldn't allocate console driver\n");
2849 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2850 console_driver->name = "tty";
2851 console_driver->name_base = 1;
2852 console_driver->major = TTY_MAJOR;
2853 console_driver->minor_start = 1;
2854 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2855 console_driver->init_termios = tty_std_termios;
2856 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2857 tty_set_operations(console_driver, &con_ops);
2858 if (tty_register_driver(console_driver))
2859 panic("Couldn't register console driver\n");
2860
2861 kbd_init();
2862 console_map_init();
2863#ifdef CONFIG_PROM_CONSOLE
2864 prom_con_init();
2865#endif
2866#ifdef CONFIG_MDA_CONSOLE
2867 mda_console_init();
2868#endif
2869 return 0;
2870}
2871
2872#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 2873#include <linux/device.h>
2874
2875static struct class *vtconsole_class;
2876
b7269dd2
JB		 2877static int bind_con_driver(const struct consw *csw, int first, int last,
2878 int deflt)
1da177e4 2879{
3e795de7
AD		 2880 struct module *owner = csw->owner;
2881 const char *desc = NULL;
2882 struct con_driver *con_driver;
2883 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2884
1da177e4
LT		 2885 if (!try_module_get(owner))
2886 return -ENODEV;
2887
1c8ce271 2888 acquire_console_sem();
1c8ce271 2889
3e795de7
AD		 2890 /* check if driver is registered */
2891 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2892 con_driver = &registered_con_driver[i];
2893
2894 if (con_driver->con == csw) {
2895 desc = con_driver->desc;
2896 retval = 0;
2897 break;
2898 }
2899 }
2900
2901 if (retval)
2902 goto err;
2903
2904 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2905 csw->con_startup();
2906 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 2907 }
1c8ce271 2908
1da177e4
LT		 2909 if (deflt) {
2910 if (conswitchp)
2911 module_put(conswitchp->owner);
1c8ce271 2912
1da177e4
LT		 2913 __module_get(owner);
2914 conswitchp = csw;
2915 }
2916
3e795de7
AD		 2917 first = max(first, con_driver->first);
2918 last = min(last, con_driver->last);
2919
1da177e4
LT		 2920 for (i = first; i <= last; i++) {
2921 int old_was_color;
2922 struct vc_data *vc = vc_cons[i].d;
2923
2924 if (con_driver_map[i])
2925 module_put(con_driver_map[i]->owner);
2926 __module_get(owner);
2927 con_driver_map[i] = csw;
2928
2929 if (!vc || !vc->vc_sw)
2930 continue;
2931
2932 j = i;
1c8ce271 2933
4ee1acce
DH		 2934 if (CON_IS_VISIBLE(vc)) {
2935 k = i;
1da177e4 2936 save_screen(vc);
4ee1acce
DH		 2937 }
2938
1da177e4
LT		 2939 old_was_color = vc->vc_can_do_color;
2940 vc->vc_sw->con_deinit(vc);
2941 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 2942 visual_init(vc, i, 0);
1c8ce271 2943 set_origin(vc);
1da177e4
LT		 2944 update_attr(vc);
2945
2946 /* If the console changed between mono <-> color, then
2947 * the attributes in the screenbuf will be wrong. The
2948 * following resets all attributes to something sane.
2949 */
2950 if (old_was_color != vc->vc_can_do_color)
2951 clear_buffer_attributes(vc);
1da177e4 2952 }
4ee1acce 2953
1da177e4
LT		 2954 printk("Console: switching ");
2955 if (!deflt)
2956 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 2957 if (j >= 0) {
2958 struct vc_data *vc = vc_cons[j].d;
2959
1da177e4 2960 printk("to %s %s %dx%d\n",
4ee1acce
DH		 2961 vc->vc_can_do_color ? "colour" : "mono",
2962 desc, vc->vc_cols, vc->vc_rows);
2963
2964 if (k >= 0) {
2965 vc = vc_cons[k].d;
2966 update_screen(vc);
2967 }
2968 } else
1da177e4
LT		 2969 printk("to %s\n", desc);
2970
3e795de7
AD		 2971 retval = 0;
2972err:
1da177e4 2973 release_console_sem();
1da177e4 2974 module_put(owner);
3e795de7
AD		 2975 return retval;
2976};
1da177e4 2977
13ae6645
AD		 2978#ifdef CONFIG_VT_HW_CONSOLE_BINDING
2979static int con_is_graphics(const struct consw *csw, int first, int last)
2980{
2981 int i, retval = 0;
2982
2983 for (i = first; i <= last; i++) {
2984 struct vc_data *vc = vc_cons[i].d;
2985
2986 if (vc && vc->vc_mode == KD_GRAPHICS) {
2987 retval = 1;
2988 break;
2989 }
2990 }
2991
2992 return retval;
2993}
2994
b7269dd2
JB		 2995/**
2996 * unbind_con_driver - unbind a console driver
2997 * @csw: pointer to console driver to unregister
2998 * @first: first in range of consoles that @csw should be unbound from
2999 * @last: last in range of consoles that @csw should be unbound from
3000 * @deflt: should next bound console driver be default after @csw is unbound?
3001 *
3002 * To unbind a driver from all possible consoles, pass 0 as @first and
3003 * %MAX_NR_CONSOLES as @last.
3004 *
3005 * @deflt controls whether the console that ends up replacing @csw should be
3006 * the default console.
3007 *
3008 * RETURNS:
3009 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3010 * or 0 on success.
3011 */
623e71b0 3012int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3013{
3e795de7
AD		 3014 struct module *owner = csw->owner;
3015 const struct consw *defcsw = NULL;
3016 struct con_driver *con_driver = NULL, *con_back = NULL;
3017 int i, retval = -ENODEV;
1da177e4 3018
3e795de7
AD		 3019 if (!try_module_get(owner))
3020 return -ENODEV;
3021
3022 acquire_console_sem();
3023
3024 /* check if driver is registered and if it is unbindable */
3025 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3026 con_driver = &registered_con_driver[i];
3027
3028 if (con_driver->con == csw &&
6db4063c 3029 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3030 retval = 0;
3031 break;
3032 }
3033 }
3034
3035 if (retval) {
3036 release_console_sem();
3037 goto err;
3038 }
3039
6db4063c
AD		 3040 retval = -ENODEV;
3041
3e795de7
AD		 3042 /* check if backup driver exists */
3043 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3044 con_back = &registered_con_driver[i];
3045
3046 if (con_back->con &&
6db4063c 3047 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3048 defcsw = con_back->con;
3049 retval = 0;
3050 break;
3051 }
3052 }
3053
3054 if (retval) {
3055 release_console_sem();
3056 goto err;
3057 }
3058
3059 if (!con_is_bound(csw)) {
3060 release_console_sem();
3061 goto err;
3062 }
3063
3064 first = max(first, con_driver->first);
3065 last = min(last, con_driver->last);
3066
3067 for (i = first; i <= last; i++) {
1da177e4
LT		 3068 if (con_driver_map[i] == csw) {
3069 module_put(csw->owner);
3070 con_driver_map[i] = NULL;
3071 }
3e795de7
AD		 3072 }
3073
3074 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3075 const struct consw *defconsw = conswitchp;
3076
3e795de7
AD		 3077 defcsw->con_startup();
3078 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3079 /*
3080 * vgacon may change the default driver to point
3081 * to dummycon, we restore it here...
3082 */
3083 conswitchp = defconsw;
3e795de7
AD		 3084 }
3085
3086 if (!con_is_bound(csw))
3087 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3088
3089 release_console_sem();
6db4063c
AD		 3090 /* ignore return value, binding should not fail */
3091 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3092err:
3093 module_put(owner);
3094 return retval;
3095
3096}
623e71b0 3097EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3098
6db4063c
AD		 3099static int vt_bind(struct con_driver *con)
3100{
3101 const struct consw *defcsw = NULL, *csw = NULL;
3102 int i, more = 1, first = -1, last = -1, deflt = 0;
3103
3104 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3105 con_is_graphics(con->con, con->first, con->last))
3106 goto err;
3107
3108 csw = con->con;
3109
3110 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3111 struct con_driver *con = &registered_con_driver[i];
3112
3113 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3114 defcsw = con->con;
3115 break;
3116 }
3117 }
3118
3119 if (!defcsw)
3120 goto err;
3121
3122 while (more) {
3123 more = 0;
3124
3125 for (i = con->first; i <= con->last; i++) {
3126 if (con_driver_map[i] == defcsw) {
3127 if (first == -1)
3128 first = i;
3129 last = i;
3130 more = 1;
3131 } else if (first != -1)
3132 break;
3133 }
3134
3135 if (first == 0 && last == MAX_NR_CONSOLES -1)
3136 deflt = 1;
3137
3138 if (first != -1)
3139 bind_con_driver(csw, first, last, deflt);
3140
3141 first = -1;
3142 last = -1;
3143 deflt = 0;
3144 }
3145
3146err:
3147 return 0;
3148}
3149
3150static int vt_unbind(struct con_driver *con)
3151{
3152 const struct consw *csw = NULL;
3153 int i, more = 1, first = -1, last = -1, deflt = 0;
3154
3155 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3156 con_is_graphics(con->con, con->first, con->last))
3157 goto err;
3158
3159 csw = con->con;
3160
3161 while (more) {
3162 more = 0;
3163
3164 for (i = con->first; i <= con->last; i++) {
3165 if (con_driver_map[i] == csw) {
3166 if (first == -1)
3167 first = i;
3168 last = i;
3169 more = 1;
3170 } else if (first != -1)
3171 break;
3172 }
3173
3174 if (first == 0 && last == MAX_NR_CONSOLES -1)
3175 deflt = 1;
3176
3177 if (first != -1)
3178 unbind_con_driver(csw, first, last, deflt);
3179
3180 first = -1;
3181 last = -1;
3182 deflt = 0;
3183 }
3184
3185err:
3186 return 0;
3187}
13ae6645
AD		 3188#else
3189static inline int vt_bind(struct con_driver *con)
3190{
3191 return 0;
3192}
3193static inline int vt_unbind(struct con_driver *con)
3194{
3195 return 0;
3196}
3197#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3198
805952a8 3199static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3200 const char *buf, size_t count)
3201{
805952a8 3202 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3203 int bind = simple_strtoul(buf, NULL, 0);
3204
3205 if (bind)
3206 vt_bind(con);
3207 else
3208 vt_unbind(con);
3209
3210 return count;
3211}
3212
805952a8
GKH		 3213static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3214 char *buf)
6db4063c 3215{
805952a8 3216 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3217 int bind = con_is_bound(con->con);
3218
3219 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3220}
3221
805952a8
GKH		 3222static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3223 char *buf)
6db4063c 3224{
805952a8 3225 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3226
3227 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3228 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3229 con->desc);
3230
3231}
3232
805952a8 3233static struct device_attribute device_attrs[] = {
6db4063c
AD		 3234 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3235 __ATTR(name, S_IRUGO, show_name, NULL),
3236};
3237
805952a8 3238static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3239{
3240 int i;
928e964f 3241 int error = 0;
6db4063c 3242
928e964f 3243 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3244 dev_set_drvdata(con->dev, con);
3245 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3246 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3247 if (error)
3248 break;
3249 }
6db4063c 3250
928e964f
AD		 3251 if (error) {
3252 while (--i >= 0)
805952a8 3253 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3254 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3255 }
3256
3257 return error;
6db4063c
AD		 3258}
3259
805952a8 3260static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3261{
3262 int i;
3263
928e964f 3264 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3265 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3266 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3267 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3268 }
6db4063c
AD		 3269}
3270
3e795de7
AD		 3271/**
3272 * con_is_bound - checks if driver is bound to the console
3273 * @csw: console driver
3274 *
3275 * RETURNS: zero if unbound, nonzero if bound
3276 *
3277 * Drivers can call this and if zero, they should release
3278 * all resources allocated on con_startup()
3279 */
3280int con_is_bound(const struct consw *csw)
3281{
3282 int i, bound = 0;
3283
3284 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3285 if (con_driver_map[i] == csw) {
3286 bound = 1;
3287 break;
3288 }
3289 }
3290
3291 return bound;
3292}
3293EXPORT_SYMBOL(con_is_bound);
3294
3295/**
3296 * register_con_driver - register console driver to console layer
3297 * @csw: console driver
3298 * @first: the first console to take over, minimum value is 0
3299 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3300 *
3301 * DESCRIPTION: This function registers a console driver which can later
3302 * bind to a range of consoles specified by @first and @last. It will
3303 * also initialize the console driver by calling con_startup().
3304 */
3305int register_con_driver(const struct consw *csw, int first, int last)
3306{
3307 struct module *owner = csw->owner;
3308 struct con_driver *con_driver;
3309 const char *desc;
3310 int i, retval = 0;
3311
3312 if (!try_module_get(owner))
3313 return -ENODEV;
3314
3315 acquire_console_sem();
3316
3317 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3318 con_driver = &registered_con_driver[i];
3319
3320 /* already registered */
3321 if (con_driver->con == csw)
3322 retval = -EINVAL;
3323 }
3324
3325 if (retval)
3326 goto err;
3327
3328 desc = csw->con_startup();
3329
3330 if (!desc)
3331 goto err;
3332
3333 retval = -EINVAL;
3334
3335 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3336 con_driver = &registered_con_driver[i];
3337
3338 if (con_driver->con == NULL) {
3339 con_driver->con = csw;
3340 con_driver->desc = desc;
6db4063c
AD		 3341 con_driver->node = i;
3342 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3343 CON_DRIVER_FLAG_INIT;
3344 con_driver->first = first;
3345 con_driver->last = last;
3346 retval = 0;
3347 break;
3348 }
3349 }
3350
6db4063c
AD		 3351 if (retval)
3352 goto err;
3353
805952a8
GKH		 3354 con_driver->dev = device_create(vtconsole_class, NULL,
3355 MKDEV(0, con_driver->node),
3356 "vtcon%i", con_driver->node);
6db4063c 3357
805952a8
GKH		 3358 if (IS_ERR(con_driver->dev)) {
3359 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3360 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3361 PTR_ERR(con_driver->dev));
3362 con_driver->dev = NULL;
6db4063c 3363 } else {
805952a8 3364 vtconsole_init_device(con_driver);
6db4063c 3365 }
928e964f 3366
3e795de7
AD		 3367err:
3368 release_console_sem();
3369 module_put(owner);
3370 return retval;
3371}
3372EXPORT_SYMBOL(register_con_driver);
3373
3374/**
3375 * unregister_con_driver - unregister console driver from console layer
3376 * @csw: console driver
3377 *
3378 * DESCRIPTION: All drivers that registers to the console layer must
3379 * call this function upon exit, or if the console driver is in a state
3380 * where it won't be able to handle console services, such as the
3381 * framebuffer console without loaded framebuffer drivers.
3382 *
3383 * The driver must unbind first prior to unregistration.
3384 */
3385int unregister_con_driver(const struct consw *csw)
3386{
3387 int i, retval = -ENODEV;
3388
3389 acquire_console_sem();
3390
3391 /* cannot unregister a bound driver */
3392 if (con_is_bound(csw))
3393 goto err;
3394
3395 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3396 struct con_driver *con_driver = &registered_con_driver[i];
3397
3398 if (con_driver->con == csw &&
6db4063c 3399 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3400 vtconsole_deinit_device(con_driver);
3401 device_destroy(vtconsole_class,
3402 MKDEV(0, con_driver->node));
3e795de7
AD		 3403 con_driver->con = NULL;
3404 con_driver->desc = NULL;
805952a8 3405 con_driver->dev = NULL;
6db4063c 3406 con_driver->node = 0;
3e795de7
AD		 3407 con_driver->flag = 0;
3408 con_driver->first = 0;
3409 con_driver->last = 0;
3410 retval = 0;
3411 break;
3412 }
3413 }
3e795de7
AD		 3414err:
3415 release_console_sem();
3416 return retval;
3417}
3418EXPORT_SYMBOL(unregister_con_driver);
3419
3420/*
3421 * If we support more console drivers, this function is used
3422 * when a driver wants to take over some existing consoles
3423 * and become default driver for newly opened ones.
3424 *
3425 * take_over_console is basically a register followed by unbind
3426 */
3427int take_over_console(const struct consw *csw, int first, int last, int deflt)
3428{
3429 int err;
3430
3431 err = register_con_driver(csw, first, last);
3432
3433 if (!err)
6db4063c 3434 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3435
3436 return err;
3437}
3438
3439/*
3440 * give_up_console is a wrapper to unregister_con_driver. It will only
3441 * work if driver is fully unbound.
3442 */
3443void give_up_console(const struct consw *csw)
3444{
3445 unregister_con_driver(csw);
3446}
3447
6db4063c 3448static int __init vtconsole_class_init(void)
3e795de7 3449{
6db4063c 3450 int i;
3e795de7 3451
6db4063c
AD		 3452 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3453 if (IS_ERR(vtconsole_class)) {
3454 printk(KERN_WARNING "Unable to create vt console class; "
3455 "errno = %ld\n", PTR_ERR(vtconsole_class));
3456 vtconsole_class = NULL;
3457 }
3e795de7 3458
6db4063c 3459 /* Add system drivers to sysfs */
3e795de7
AD		 3460 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3461 struct con_driver *con = &registered_con_driver[i];
3462
805952a8
GKH		 3463 if (con->con && !con->dev) {
3464 con->dev = device_create(vtconsole_class, NULL,
3465 MKDEV(0, con->node),
3466 "vtcon%i", con->node);
6db4063c 3467
805952a8 3468 if (IS_ERR(con->dev)) {
6db4063c 3469 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3470 "device for %s; errno = %ld\n",
3471 con->desc, PTR_ERR(con->dev));
3472 con->dev = NULL;
6db4063c 3473 } else {
805952a8 3474 vtconsole_init_device(con);
6db4063c 3475 }
3e795de7 3476 }
3e795de7
AD		 3477 }
3478
3e795de7
AD		 3479 return 0;
3480}
6db4063c 3481postcore_initcall(vtconsole_class_init);
3e795de7 3482
1da177e4
LT		 3483#endif
3484
3485/*
3486 * Screen blanking
3487 */
3488
403aac96 3489static int set_vesa_blanking(char __user *p)
1da177e4 3490{
403aac96
YY		 3491 unsigned int mode;
3492
3493 if (get_user(mode, p + 1))
3494 return -EFAULT;
3495
3496 vesa_blank_mode = (mode < 4) ? mode : 0;
3497 return 0;
1da177e4
LT		 3498}
3499
1da177e4
LT		 3500void do_blank_screen(int entering_gfx)
3501{
3502 struct vc_data *vc = vc_cons[fg_console].d;
3503 int i;
3504
3505 WARN_CONSOLE_UNLOCKED();
3506
3507 if (console_blanked) {
3508 if (blank_state == blank_vesa_wait) {
3509 blank_state = blank_off;
d060a321 3510 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3511 }
3512 return;
3513 }
1da177e4
LT		 3514
3515 /* entering graphics mode? */
3516 if (entering_gfx) {
3517 hide_cursor(vc);
3518 save_screen(vc);
3519 vc->vc_sw->con_blank(vc, -1, 1);
3520 console_blanked = fg_console + 1;
b6e8f00f 3521 blank_state = blank_off;
1da177e4
LT		 3522 set_origin(vc);
3523 return;
3524 }
3525
b6e8f00f 3526 if (blank_state != blank_normal_wait)
3527 return;
3528 blank_state = blank_off;
3529
1da177e4
LT		 3530 /* don't blank graphics */
3531 if (vc->vc_mode != KD_TEXT) {
3532 console_blanked = fg_console + 1;
3533 return;
3534 }
3535
3536 hide_cursor(vc);
3537 del_timer_sync(&console_timer);
3538 blank_timer_expired = 0;
3539
3540 save_screen(vc);
3541 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3542 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3543 console_blanked = fg_console + 1;
3544 if (i)
3545 set_origin(vc);
3546
3547 if (console_blank_hook && console_blank_hook(1))
3548 return;
3549
d060a321 3550 if (vesa_off_interval && vesa_blank_mode) {
030babac 3551 blank_state = blank_vesa_wait;
1da177e4
LT		 3552 mod_timer(&console_timer, jiffies + vesa_off_interval);
3553 }
1da177e4
LT		 3554}
3555EXPORT_SYMBOL(do_blank_screen);
3556
3557/*
3558 * Called by timer as well as from vt_console_driver
3559 */
3560void do_unblank_screen(int leaving_gfx)
3561{
3562 struct vc_data *vc;
3563
3564 /* This should now always be called from a "sane" (read: can schedule)
3565 * context for the sake of the low level drivers, except in the special
3566 * case of oops_in_progress
3567 */
3568 if (!oops_in_progress)
3569 might_sleep();
3570
3571 WARN_CONSOLE_UNLOCKED();
3572
3573 ignore_poke = 0;
3574 if (!console_blanked)
3575 return;
3576 if (!vc_cons_allocated(fg_console)) {
3577 /* impossible */
3578 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3579 return;
3580 }
3581 vc = vc_cons[fg_console].d;
3582 if (vc->vc_mode != KD_TEXT)
3583 return; /* but leave console_blanked != 0 */
3584
3585 if (blankinterval) {
3586 mod_timer(&console_timer, jiffies + blankinterval);
3587 blank_state = blank_normal_wait;
3588 }
3589
3590 console_blanked = 0;
3591 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3592 /* Low-level driver cannot restore -> do it ourselves */
3593 update_screen(vc);
3594 if (console_blank_hook)
3595 console_blank_hook(0);
3596 set_palette(vc);
3597 set_cursor(vc);
3598}
3599EXPORT_SYMBOL(do_unblank_screen);
3600
3601/*
3602 * This is called by the outside world to cause a forced unblank, mostly for
3603 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3604 * call it with 1 as an argument and so force a mode restore... that may kill
3605 * X or at least garbage the screen but would also make the Oops visible...
3606 */
3607void unblank_screen(void)
3608{
3609 do_unblank_screen(0);
3610}
3611
3612/*
70522e12 3613 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3614 * (console operations can still happen at irq time, but only from printk which
70522e12 3615 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3616 */
3617static void blank_screen_t(unsigned long dummy)
3618{
cc63b1e1
JB		 3619 if (unlikely(!keventd_up())) {
3620 mod_timer(&console_timer, jiffies + blankinterval);
3621 return;
3622 }
1da177e4
LT		 3623 blank_timer_expired = 1;
3624 schedule_work(&console_work);
3625}
3626
3627void poke_blanked_console(void)
3628{
3629 WARN_CONSOLE_UNLOCKED();
3630
3631 /* Add this so we quickly catch whoever might call us in a non
3632 * safe context. Nowadays, unblank_screen() isn't to be called in
3633 * atomic contexts and is allowed to schedule (with the special case
3634 * of oops_in_progress, but that isn't of any concern for this
3635 * function. --BenH.
3636 */
3637 might_sleep();
3638
3639 /* This isn't perfectly race free, but a race here would be mostly harmless,
3640 * at worse, we'll do a spurrious blank and it's unlikely
3641 */
3642 del_timer(&console_timer);
3643 blank_timer_expired = 0;
3644
3645 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3646 return;
3647 if (console_blanked)
3648 unblank_screen();
3649 else if (blankinterval) {
3650 mod_timer(&console_timer, jiffies + blankinterval);
3651 blank_state = blank_normal_wait;
3652 }
3653}
3654
3655/*
3656 * Palettes
3657 */
3658
3659static void set_palette(struct vc_data *vc)
3660{
3661 WARN_CONSOLE_UNLOCKED();
3662
3663 if (vc->vc_mode != KD_GRAPHICS)
3664 vc->vc_sw->con_set_palette(vc, color_table);
3665}
3666
3667static int set_get_cmap(unsigned char __user *arg, int set)
3668{
3669 int i, j, k;
3670
3671 WARN_CONSOLE_UNLOCKED();
3672
3673 for (i = 0; i < 16; i++)
3674 if (set) {
3675 get_user(default_red[i], arg++);
3676 get_user(default_grn[i], arg++);
3677 get_user(default_blu[i], arg++);
3678 } else {
3679 put_user(default_red[i], arg++);
3680 put_user(default_grn[i], arg++);
3681 put_user(default_blu[i], arg++);
3682 }
3683 if (set) {
3684 for (i = 0; i < MAX_NR_CONSOLES; i++)
3685 if (vc_cons_allocated(i)) {
3686 for (j = k = 0; j < 16; j++) {
3687 vc_cons[i].d->vc_palette[k++] = default_red[j];
3688 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3689 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3690 }
3691 set_palette(vc_cons[i].d);
3692 }
3693 }
3694 return 0;
3695}
3696
3697/*
3698 * Load palette into the DAC registers. arg points to a colour
3699 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3700 */
3701
3702int con_set_cmap(unsigned char __user *arg)
3703{
3704 int rc;
3705
3706 acquire_console_sem();
3707 rc = set_get_cmap (arg,1);
3708 release_console_sem();
3709
3710 return rc;
3711}
3712
3713int con_get_cmap(unsigned char __user *arg)
3714{
3715 int rc;
3716
3717 acquire_console_sem();
3718 rc = set_get_cmap (arg,0);
3719 release_console_sem();
3720
3721 return rc;
3722}
3723
3724void reset_palette(struct vc_data *vc)
3725{
3726 int j, k;
3727 for (j=k=0; j<16; j++) {
3728 vc->vc_palette[k++] = default_red[j];
3729 vc->vc_palette[k++] = default_grn[j];
3730 vc->vc_palette[k++] = default_blu[j];
3731 }
3732 set_palette(vc);
3733}
3734
3735/*
3736 * Font switching
3737 *
3738 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3739 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3740 * depending on width) reserved for each character which is kinda wasty, but
3741 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3742 * is upto the actual low-level console-driver convert data into its favorite
3743 * format (maybe we should add a `fontoffset' field to the `display'
3744 * structure so we won't have to convert the fontdata all the time.
3745 * /Jes
3746 */
3747
3748#define max_font_size 65536
3749
3750static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3751{
3752 struct console_font font;
3753 int rc = -EINVAL;
3754 int c;
3755
3756 if (vc->vc_mode != KD_TEXT)
3757 return -EINVAL;
3758
3759 if (op->data) {
3760 font.data = kmalloc(max_font_size, GFP_KERNEL);
3761 if (!font.data)
3762 return -ENOMEM;
3763 } else
3764 font.data = NULL;
3765
3766 acquire_console_sem();
3767 if (vc->vc_sw->con_font_get)
3768 rc = vc->vc_sw->con_font_get(vc, &font);
3769 else
3770 rc = -ENOSYS;
3771 release_console_sem();
3772
3773 if (rc)
3774 goto out;
3775
3776 c = (font.width+7)/8 * 32 * font.charcount;
3777
3778 if (op->data && font.charcount > op->charcount)
3779 rc = -ENOSPC;
3780 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3781 if (font.width > op->width || font.height > op->height)
3782 rc = -ENOSPC;
3783 } else {
3784 if (font.width != 8)
3785 rc = -EIO;
3786 else if ((op->height && font.height > op->height) ||
3787 font.height > 32)
3788 rc = -ENOSPC;
3789 }
3790 if (rc)
3791 goto out;
3792
3793 op->height = font.height;
3794 op->width = font.width;
3795 op->charcount = font.charcount;
3796
3797 if (op->data && copy_to_user(op->data, font.data, c))
3798 rc = -EFAULT;
3799
3800out:
3801 kfree(font.data);
3802 return rc;
3803}
3804
3805static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3806{
3807 struct console_font font;
3808 int rc = -EINVAL;
3809 int size;
3810
3811 if (vc->vc_mode != KD_TEXT)
3812 return -EINVAL;
3813 if (!op->data)
3814 return -EINVAL;
3815 if (op->charcount > 512)
3816 return -EINVAL;
3817 if (!op->height) { /* Need to guess font height [compat] */
3818 int h, i;
3819 u8 __user *charmap = op->data;
3820 u8 tmp;
3821
3822 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3823 so that we can get rid of this soon */
3824 if (!(op->flags & KD_FONT_FLAG_OLD))
3825 return -EINVAL;
3826 for (h = 32; h > 0; h--)
3827 for (i = 0; i < op->charcount; i++) {
3828 if (get_user(tmp, &charmap[32*i+h-1]))
3829 return -EFAULT;
3830 if (tmp)
3831 goto nonzero;
3832 }
3833 return -EINVAL;
3834 nonzero:
3835 op->height = h;
3836 }
3837 if (op->width <= 0 || op->width > 32 || op->height > 32)
3838 return -EINVAL;
3839 size = (op->width+7)/8 * 32 * op->charcount;
3840 if (size > max_font_size)
3841 return -ENOSPC;
3842 font.charcount = op->charcount;
3843 font.height = op->height;
3844 font.width = op->width;
3845 font.data = kmalloc(size, GFP_KERNEL);
3846 if (!font.data)
3847 return -ENOMEM;
3848 if (copy_from_user(font.data, op->data, size)) {
3849 kfree(font.data);
3850 return -EFAULT;
3851 }
3852 acquire_console_sem();
3853 if (vc->vc_sw->con_font_set)
3854 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3855 else
3856 rc = -ENOSYS;
3857 release_console_sem();
3858 kfree(font.data);
3859 return rc;
3860}
3861
3862static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3863{
3864 struct console_font font = {.width = op->width, .height = op->height};
3865 char name[MAX_FONT_NAME];
3866 char *s = name;
3867 int rc;
3868
3869 if (vc->vc_mode != KD_TEXT)
3870 return -EINVAL;
3871
3872 if (!op->data)
3873 s = NULL;
3874 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3875 return -EFAULT;
3876 else
3877 name[MAX_FONT_NAME - 1] = 0;
3878
3879 acquire_console_sem();
3880 if (vc->vc_sw->con_font_default)
3881 rc = vc->vc_sw->con_font_default(vc, &font, s);
3882 else
3883 rc = -ENOSYS;
3884 release_console_sem();
3885 if (!rc) {
3886 op->width = font.width;
3887 op->height = font.height;
3888 }
3889 return rc;
3890}
3891
3892static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3893{
3894 int con = op->height;
3895 int rc;
3896
3897 if (vc->vc_mode != KD_TEXT)
3898 return -EINVAL;
3899
3900 acquire_console_sem();
3901 if (!vc->vc_sw->con_font_copy)
3902 rc = -ENOSYS;
3903 else if (con < 0 || !vc_cons_allocated(con))
3904 rc = -ENOTTY;
3905 else if (con == vc->vc_num) /* nothing to do */
3906 rc = 0;
3907 else
3908 rc = vc->vc_sw->con_font_copy(vc, con);
3909 release_console_sem();
3910 return rc;
3911}
3912
3913int con_font_op(struct vc_data *vc, struct console_font_op *op)
3914{
3915 switch (op->op) {
3916 case KD_FONT_OP_SET:
3917 return con_font_set(vc, op);
3918 case KD_FONT_OP_GET:
3919 return con_font_get(vc, op);
3920 case KD_FONT_OP_SET_DEFAULT:
3921 return con_font_default(vc, op);
3922 case KD_FONT_OP_COPY:
3923 return con_font_copy(vc, op);
3924 }
3925 return -ENOSYS;
3926}
3927
3928/*
3929 * Interface exported to selection and vcs.
3930 */
3931
3932/* used by selection */
3933u16 screen_glyph(struct vc_data *vc, int offset)
3934{
3935 u16 w = scr_readw(screenpos(vc, offset, 1));
3936 u16 c = w & 0xff;
3937
3938 if (w & vc->vc_hi_font_mask)
3939 c |= 0x100;
3940 return c;
3941}
3942
3943/* used by vcs - note the word offset */
3944unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3945{
3946 return screenpos(vc, 2 * w_offset, viewed);
3947}
3948
3949void getconsxy(struct vc_data *vc, unsigned char *p)
3950{
3951 p[0] = vc->vc_x;
3952 p[1] = vc->vc_y;
3953}
3954
3955void putconsxy(struct vc_data *vc, unsigned char *p)
3956{
9477e260 3957 hide_cursor(vc);
1da177e4
LT		 3958 gotoxy(vc, p[0], p[1]);
3959 set_cursor(vc);
3960}
3961
3962u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3963{
3964 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3965 return softcursor_original;
3966 return scr_readw(org);
3967}
3968
3969void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3970{
3971 scr_writew(val, org);
3972 if ((unsigned long)org == vc->vc_pos) {
3973 softcursor_original = -1;
3974 add_softcursor(vc);
3975 }
3976}
3977
3978/*
3979 * Visible symbols for modules
3980 */
3981
3982EXPORT_SYMBOL(color_table);
3983EXPORT_SYMBOL(default_red);
3984EXPORT_SYMBOL(default_grn);
3985EXPORT_SYMBOL(default_blu);
3986EXPORT_SYMBOL(update_region);
3987EXPORT_SYMBOL(redraw_screen);
3988EXPORT_SYMBOL(vc_resize);
ca9bda00 3989EXPORT_SYMBOL(vc_lock_resize);
1da177e4
LT		 3990EXPORT_SYMBOL(fg_console);
3991EXPORT_SYMBOL(console_blank_hook);
3992EXPORT_SYMBOL(console_blanked);
3993EXPORT_SYMBOL(vc_cons);
3994#ifndef VT_SINGLE_DRIVER
3995EXPORT_SYMBOL(take_over_console);
3996EXPORT_SYMBOL(give_up_console);
3997#endif
Linux kernel - Deliverables
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