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[PATCH] vt: rework the console spawning variables
[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>
1da177e4
LT		 89#include <linux/vt_kern.h>
90#include <linux/selection.h>
91#include <linux/tiocl.h>
92#include <linux/kbd_kern.h>
93#include <linux/consolemap.h>
94#include <linux/timer.h>
95#include <linux/interrupt.h>
1da177e4
LT		 96#include <linux/workqueue.h>
97#include <linux/bootmem.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101
102#include <asm/io.h>
103#include <asm/system.h>
104#include <asm/uaccess.h>
105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
3e795de7
AD		 109#define CON_DRIVER_FLAG_INIT 2
110
111struct con_driver {
112 const struct consw *con;
113 const char *desc;
6db4063c
AD		 114 struct class_device *class_dev;
115 int node;
3e795de7
AD		 116 int first;
117 int last;
118 int flag;
119};
120
121static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 122const struct consw *conswitchp;
123
124/* A bitmap for codes <32. A bit of 1 indicates that the code
125 * corresponding to that bit number invokes some special action
126 * (such as cursor movement) and should not be displayed as a
127 * glyph unless the disp_ctrl mode is explicitly enabled.
128 */
129#define CTRL_ACTION 0x0d00ff81
130#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
131
132/*
133 * Here is the default bell parameters: 750HZ, 1/8th of a second
134 */
135#define DEFAULT_BELL_PITCH 750
136#define DEFAULT_BELL_DURATION (HZ/8)
137
d09d7ddf
AC		 138extern void vcs_make_sysfs(struct tty_struct *tty);
139extern void vcs_remove_sysfs(struct tty_struct *tty);
1da177e4
LT		 140
141extern void console_map_init(void);
142#ifdef CONFIG_PROM_CONSOLE
143extern void prom_con_init(void);
144#endif
145#ifdef CONFIG_MDA_CONSOLE
146extern int mda_console_init(void);
147#endif
148
149struct vc vc_cons [MAX_NR_CONSOLES];
150
151#ifndef VT_SINGLE_DRIVER
152static const struct consw *con_driver_map[MAX_NR_CONSOLES];
153#endif
154
155static int con_open(struct tty_struct *, struct file *);
156static void vc_init(struct vc_data *vc, unsigned int rows,
157 unsigned int cols, int do_clear);
158static void gotoxy(struct vc_data *vc, int new_x, int new_y);
159static void save_cur(struct vc_data *vc);
160static void reset_terminal(struct vc_data *vc, int do_clear);
161static void con_flush_chars(struct tty_struct *tty);
162static void set_vesa_blanking(char __user *p);
163static void set_cursor(struct vc_data *vc);
164static void hide_cursor(struct vc_data *vc);
165static void console_callback(void *ignored);
166static void blank_screen_t(unsigned long dummy);
167static void set_palette(struct vc_data *vc);
168
169static int printable; /* Is console ready for printing? */
170
171/*
172 * ignore_poke: don't unblank the screen when things are typed. This is
173 * mainly for the privacy of braille terminal users.
174 */
175static int ignore_poke;
176
177int do_poke_blanked_console;
178int console_blanked;
179
180static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
181static int blankinterval = 10*60*HZ;
182static int vesa_off_interval;
183
184static DECLARE_WORK(console_work, console_callback, NULL);
185
186/*
187 * fg_console is the current virtual console,
188 * last_console is the last used one,
189 * want_console is the console we want to switch to,
190 * kmsg_redirect is the console for kernel messages,
191 */
192int fg_console;
193int last_console;
194int want_console = -1;
195int kmsg_redirect;
196
197/*
198 * For each existing display, we have a pointer to console currently visible
199 * on that display, allowing consoles other than fg_console to be refreshed
200 * appropriately. Unless the low-level driver supplies its own display_fg
201 * variable, we use this one for the "master display".
202 */
203static struct vc_data *master_display_fg;
204
205/*
206 * Unfortunately, we need to delay tty echo when we're currently writing to the
207 * console since the code is (and always was) not re-entrant, so we schedule
208 * all flip requests to process context with schedule-task() and run it from
209 * console_callback().
210 */
211
212/*
213 * For the same reason, we defer scrollback to the console callback.
214 */
215static int scrollback_delta;
216
217/*
218 * Hook so that the power management routines can (un)blank
219 * the console on our behalf.
220 */
221int (*console_blank_hook)(int);
222
223static struct timer_list console_timer;
224static int blank_state;
225static int blank_timer_expired;
226enum {
227 blank_off = 0,
228 blank_normal_wait,
229 blank_vesa_wait,
230};
231
232/*
233 * Low-Level Functions
234 */
235
236#define IS_FG(vc) ((vc)->vc_num == fg_console)
237
238#ifdef VT_BUF_VRAM_ONLY
239#define DO_UPDATE(vc) 0
240#else
241#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
242#endif
243
244static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
245{
246 unsigned short *p;
247
248 if (!viewed)
249 p = (unsigned short *)(vc->vc_origin + offset);
250 else if (!vc->vc_sw->con_screen_pos)
251 p = (unsigned short *)(vc->vc_visible_origin + offset);
252 else
253 p = vc->vc_sw->con_screen_pos(vc, offset);
254 return p;
255}
256
257static inline void scrolldelta(int lines)
258{
259 scrollback_delta += lines;
260 schedule_console_callback();
261}
262
263void schedule_console_callback(void)
264{
265 schedule_work(&console_work);
266}
267
268static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
269{
270 unsigned short *d, *s;
271
272 if (t+nr >= b)
273 nr = b - t - 1;
274 if (b > vc->vc_rows || t >= b || nr < 1)
275 return;
276 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
277 return;
278 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
279 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
280 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
281 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
282 vc->vc_size_row * nr);
283}
284
285static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
286{
287 unsigned short *s;
288 unsigned int step;
289
290 if (t+nr >= b)
291 nr = b - t - 1;
292 if (b > vc->vc_rows || t >= b || nr < 1)
293 return;
294 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
295 return;
296 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
297 step = vc->vc_cols * nr;
298 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
299 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
300}
301
302static void do_update_region(struct vc_data *vc, unsigned long start, int count)
303{
304#ifndef VT_BUF_VRAM_ONLY
305 unsigned int xx, yy, offset;
306 u16 *p;
307
308 p = (u16 *) start;
309 if (!vc->vc_sw->con_getxy) {
310 offset = (start - vc->vc_origin) / 2;
311 xx = offset % vc->vc_cols;
312 yy = offset / vc->vc_cols;
313 } else {
314 int nxx, nyy;
315 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
316 xx = nxx; yy = nyy;
317 }
318 for(;;) {
319 u16 attrib = scr_readw(p) & 0xff00;
320 int startx = xx;
321 u16 *q = p;
322 while (xx < vc->vc_cols && count) {
323 if (attrib != (scr_readw(p) & 0xff00)) {
324 if (p > q)
325 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
326 startx = xx;
327 q = p;
328 attrib = scr_readw(p) & 0xff00;
329 }
330 p++;
331 xx++;
332 count--;
333 }
334 if (p > q)
335 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
336 if (!count)
337 break;
338 xx = 0;
339 yy++;
340 if (vc->vc_sw->con_getxy) {
341 p = (u16 *)start;
342 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
343 }
344 }
345#endif
346}
347
348void update_region(struct vc_data *vc, unsigned long start, int count)
349{
350 WARN_CONSOLE_UNLOCKED();
351
352 if (DO_UPDATE(vc)) {
353 hide_cursor(vc);
354 do_update_region(vc, start, count);
355 set_cursor(vc);
356 }
357}
358
359/* Structure of attributes is hardware-dependent */
360
361static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
362{
363 if (vc->vc_sw->con_build_attr)
364 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
365
366#ifndef VT_BUF_VRAM_ONLY
367/*
368 * ++roman: I completely changed the attribute format for monochrome
369 * mode (!can_do_color). The formerly used MDA (monochrome display
370 * adapter) format didn't allow the combination of certain effects.
371 * Now the attribute is just a bit vector:
372 * Bit 0..1: intensity (0..2)
373 * Bit 2 : underline
374 * Bit 3 : reverse
375 * Bit 7 : blink
376 */
377 {
378 u8 a = vc->vc_color;
379 if (!vc->vc_can_do_color)
380 return _intensity |
381 (_underline ? 4 : 0) |
382 (_reverse ? 8 : 0) |
383 (_blink ? 0x80 : 0);
384 if (_underline)
385 a = (a & 0xf0) | vc->vc_ulcolor;
386 else if (_intensity == 0)
387 a = (a & 0xf0) | vc->vc_ulcolor;
388 if (_reverse)
389 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
390 if (_blink)
391 a ^= 0x80;
392 if (_intensity == 2)
393 a ^= 0x08;
394 if (vc->vc_hi_font_mask == 0x100)
395 a <<= 1;
396 return a;
397 }
398#else
399 return 0;
400#endif
401}
402
403static void update_attr(struct vc_data *vc)
404{
405 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
406 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
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 */
732 vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
733 if (!vc)
734 return -ENOMEM;
735 memset(vc, 0, sizeof(*vc));
736 vc_cons[currcons].d = vc;
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
753static inline int resize_screen(struct vc_data *vc, int width, int height)
754{
755 /* Resizes the resolution of the display adapater */
756 int err = 0;
757
758 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
759 err = vc->vc_sw->con_resize(vc, width, height);
760 return err;
761}
762
763/*
764 * Change # of rows and columns (0 means unchanged/the size of fg_console)
765 * [this is to be used together with some user program
766 * like resize that changes the hardware videomode]
767 */
768#define VC_RESIZE_MAXCOL (32767)
769#define VC_RESIZE_MAXROW (32767)
770int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
771{
772 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
773 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
774 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
3b41dc1a 775 unsigned int end;
1da177e4
LT		 776 unsigned short *newscreen;
777
778 WARN_CONSOLE_UNLOCKED();
779
780 if (!vc)
781 return -ENXIO;
782
783 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
784 return -EINVAL;
785
786 new_cols = (cols ? cols : vc->vc_cols);
787 new_rows = (lines ? lines : vc->vc_rows);
788 new_row_size = new_cols << 1;
789 new_screen_size = new_row_size * new_rows;
790
791 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
792 return 0;
793
794 newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
795 if (!newscreen)
796 return -ENOMEM;
797
798 old_rows = vc->vc_rows;
799 old_cols = vc->vc_cols;
800 old_row_size = vc->vc_size_row;
801 old_screen_size = vc->vc_screenbuf_size;
802
803 err = resize_screen(vc, new_cols, new_rows);
804 if (err) {
805 kfree(newscreen);
806 return err;
807 }
808
809 vc->vc_rows = new_rows;
810 vc->vc_cols = new_cols;
811 vc->vc_size_row = new_row_size;
812 vc->vc_screenbuf_size = new_screen_size;
813
814 rlth = min(old_row_size, new_row_size);
815 rrem = new_row_size - rlth;
816 old_origin = vc->vc_origin;
817 new_origin = (long) newscreen;
818 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 819
820 if (vc->vc_y > new_rows) {
821 if (old_rows - vc->vc_y < new_rows) {
822 /*
823 * Cursor near the bottom, copy contents from the
824 * bottom of buffer
825 */
826 old_origin += (old_rows - new_rows) * old_row_size;
827 end = vc->vc_scr_end;
828 } else {
829 /*
830 * Cursor is in no man's land, copy 1/2 screenful
831 * from the top and bottom of cursor position
832 */
833 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 834 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 835 }
836 } else
837 /*
838 * Cursor near the top, copy contents from the top of buffer
839 */
065d9cac
AD		 840 end = (old_rows > new_rows) ? old_origin +
841 (old_row_size * new_rows) :
3b41dc1a 842 vc->vc_scr_end;
1da177e4
LT		 843
844 update_attr(vc);
845
3b41dc1a
AD		 846 while (old_origin < end) {
847 scr_memcpyw((unsigned short *) new_origin,
848 (unsigned short *) old_origin, rlth);
1da177e4 849 if (rrem)
3b41dc1a
AD		 850 scr_memsetw((void *)(new_origin + rlth),
851 vc->vc_video_erase_char, rrem);
1da177e4
LT		 852 old_origin += old_row_size;
853 new_origin += new_row_size;
854 }
855 if (new_scr_end > new_origin)
3b41dc1a
AD		 856 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
857 new_scr_end - new_origin);
1da177e4
LT		 858 if (vc->vc_kmalloced)
859 kfree(vc->vc_screenbuf);
860 vc->vc_screenbuf = newscreen;
861 vc->vc_kmalloced = 1;
862 vc->vc_screenbuf_size = new_screen_size;
863 set_origin(vc);
864
865 /* do part of a reset_terminal() */
866 vc->vc_top = 0;
867 vc->vc_bottom = vc->vc_rows;
868 gotoxy(vc, vc->vc_x, vc->vc_y);
869 save_cur(vc);
870
871 if (vc->vc_tty) {
872 struct winsize ws, *cws = &vc->vc_tty->winsize;
873
874 memset(&ws, 0, sizeof(ws));
875 ws.ws_row = vc->vc_rows;
876 ws.ws_col = vc->vc_cols;
877 ws.ws_ypixel = vc->vc_scan_lines;
878 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
879 vc->vc_tty->pgrp > 0)
880 kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
881 *cws = ws;
882 }
883
884 if (CON_IS_VISIBLE(vc))
885 update_screen(vc);
886 return err;
887}
888
ca9bda00
AC		 889int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
890{
891 int rc;
892
893 acquire_console_sem();
894 rc = vc_resize(vc, cols, lines);
895 release_console_sem();
896 return rc;
897}
1da177e4 898
ca9bda00 899void vc_deallocate(unsigned int currcons)
1da177e4
LT		 900{
901 WARN_CONSOLE_UNLOCKED();
902
903 if (vc_cons_allocated(currcons)) {
904 struct vc_data *vc = vc_cons[currcons].d;
905 vc->vc_sw->con_deinit(vc);
d459ec0b 906 module_put(vc->vc_sw->owner);
1da177e4
LT		 907 if (vc->vc_kmalloced)
908 kfree(vc->vc_screenbuf);
909 if (currcons >= MIN_NR_CONSOLES)
910 kfree(vc);
911 vc_cons[currcons].d = NULL;
912 }
913}
914
915/*
916 * VT102 emulator
917 */
918
919#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
920#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
921#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
922
923#define decarm VC_REPEAT
924#define decckm VC_CKMODE
925#define kbdapplic VC_APPLIC
926#define lnm VC_CRLF
927
928/*
929 * this is what the terminal answers to a ESC-Z or csi0c query.
930 */
931#define VT100ID "\033[?1;2c"
932#define VT102ID "\033[?6c"
933
934unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
935 8,12,10,14, 9,13,11,15 };
936
937/* the default colour table, for VGA+ colour systems */
938int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
939 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
940int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
941 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
942int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
943 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
944
945/*
946 * gotoxy() must verify all boundaries, because the arguments
947 * might also be negative. If the given position is out of
948 * bounds, the cursor is placed at the nearest margin.
949 */
950static void gotoxy(struct vc_data *vc, int new_x, int new_y)
951{
952 int min_y, max_y;
953
954 if (new_x < 0)
955 vc->vc_x = 0;
956 else {
957 if (new_x >= vc->vc_cols)
958 vc->vc_x = vc->vc_cols - 1;
959 else
960 vc->vc_x = new_x;
961 }
962
963 if (vc->vc_decom) {
964 min_y = vc->vc_top;
965 max_y = vc->vc_bottom;
966 } else {
967 min_y = 0;
968 max_y = vc->vc_rows;
969 }
970 if (new_y < min_y)
971 vc->vc_y = min_y;
972 else if (new_y >= max_y)
973 vc->vc_y = max_y - 1;
974 else
975 vc->vc_y = new_y;
976 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
977 vc->vc_need_wrap = 0;
978}
979
980/* for absolute user moves, when decom is set */
981static void gotoxay(struct vc_data *vc, int new_x, int new_y)
982{
983 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
984}
985
986void scrollback(struct vc_data *vc, int lines)
987{
988 if (!lines)
989 lines = vc->vc_rows / 2;
990 scrolldelta(-lines);
991}
992
993void scrollfront(struct vc_data *vc, int lines)
994{
995 if (!lines)
996 lines = vc->vc_rows / 2;
997 scrolldelta(lines);
998}
999
1000static void lf(struct vc_data *vc)
1001{
1002 /* don't scroll if above bottom of scrolling region, or
1003 * if below scrolling region
1004 */
1005 if (vc->vc_y + 1 == vc->vc_bottom)
1006 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1007 else if (vc->vc_y < vc->vc_rows - 1) {
1008 vc->vc_y++;
1009 vc->vc_pos += vc->vc_size_row;
1010 }
1011 vc->vc_need_wrap = 0;
1012}
1013
1014static void ri(struct vc_data *vc)
1015{
1016 /* don't scroll if below top of scrolling region, or
1017 * if above scrolling region
1018 */
1019 if (vc->vc_y == vc->vc_top)
1020 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1021 else if (vc->vc_y > 0) {
1022 vc->vc_y--;
1023 vc->vc_pos -= vc->vc_size_row;
1024 }
1025 vc->vc_need_wrap = 0;
1026}
1027
1028static inline void cr(struct vc_data *vc)
1029{
1030 vc->vc_pos -= vc->vc_x << 1;
1031 vc->vc_need_wrap = vc->vc_x = 0;
1032}
1033
1034static inline void bs(struct vc_data *vc)
1035{
1036 if (vc->vc_x) {
1037 vc->vc_pos -= 2;
1038 vc->vc_x--;
1039 vc->vc_need_wrap = 0;
1040 }
1041}
1042
1043static inline void del(struct vc_data *vc)
1044{
1045 /* ignored */
1046}
1047
1048static void csi_J(struct vc_data *vc, int vpar)
1049{
1050 unsigned int count;
1051 unsigned short * start;
1052
1053 switch (vpar) {
1054 case 0: /* erase from cursor to end of display */
1055 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1056 start = (unsigned short *)vc->vc_pos;
1057 if (DO_UPDATE(vc)) {
1058 /* do in two stages */
1059 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1060 vc->vc_cols - vc->vc_x);
1061 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1062 vc->vc_rows - vc->vc_y - 1,
1063 vc->vc_cols);
1064 }
1065 break;
1066 case 1: /* erase from start to cursor */
1067 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1068 start = (unsigned short *)vc->vc_origin;
1069 if (DO_UPDATE(vc)) {
1070 /* do in two stages */
1071 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1072 vc->vc_cols);
1073 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1074 vc->vc_x + 1);
1075 }
1076 break;
1077 case 2: /* erase whole display */
1078 count = vc->vc_cols * vc->vc_rows;
1079 start = (unsigned short *)vc->vc_origin;
1080 if (DO_UPDATE(vc))
1081 vc->vc_sw->con_clear(vc, 0, 0,
1082 vc->vc_rows,
1083 vc->vc_cols);
1084 break;
1085 default:
1086 return;
1087 }
1088 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1089 vc->vc_need_wrap = 0;
1090}
1091
1092static void csi_K(struct vc_data *vc, int vpar)
1093{
1094 unsigned int count;
1095 unsigned short * start;
1096
1097 switch (vpar) {
1098 case 0: /* erase from cursor to end of line */
1099 count = vc->vc_cols - vc->vc_x;
1100 start = (unsigned short *)vc->vc_pos;
1101 if (DO_UPDATE(vc))
1102 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1103 vc->vc_cols - vc->vc_x);
1104 break;
1105 case 1: /* erase from start of line to cursor */
1106 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1107 count = vc->vc_x + 1;
1108 if (DO_UPDATE(vc))
1109 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1110 vc->vc_x + 1);
1111 break;
1112 case 2: /* erase whole line */
1113 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1114 count = vc->vc_cols;
1115 if (DO_UPDATE(vc))
1116 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1117 vc->vc_cols);
1118 break;
1119 default:
1120 return;
1121 }
1122 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1123 vc->vc_need_wrap = 0;
1124}
1125
1126static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1127{ /* not vt100? */
1128 int count;
1129
1130 if (!vpar)
1131 vpar++;
1132 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1133
1134 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1135 if (DO_UPDATE(vc))
1136 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1137 vc->vc_need_wrap = 0;
1138}
1139
1140static void default_attr(struct vc_data *vc)
1141{
1142 vc->vc_intensity = 1;
1143 vc->vc_underline = 0;
1144 vc->vc_reverse = 0;
1145 vc->vc_blink = 0;
1146 vc->vc_color = vc->vc_def_color;
1147}
1148
1149/* console_sem is held */
1150static void csi_m(struct vc_data *vc)
1151{
1152 int i;
1153
1154 for (i = 0; i <= vc->vc_npar; i++)
1155 switch (vc->vc_par[i]) {
1156 case 0: /* all attributes off */
1157 default_attr(vc);
1158 break;
1159 case 1:
1160 vc->vc_intensity = 2;
1161 break;
1162 case 2:
1163 vc->vc_intensity = 0;
1164 break;
1165 case 4:
1166 vc->vc_underline = 1;
1167 break;
1168 case 5:
1169 vc->vc_blink = 1;
1170 break;
1171 case 7:
1172 vc->vc_reverse = 1;
1173 break;
1174 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1175 * Select primary font, don't display
1176 * control chars if defined, don't set
1177 * bit 8 on output.
1178 */
1179 vc->vc_translate = set_translate(vc->vc_charset == 0
1180 ? vc->vc_G0_charset
1181 : vc->vc_G1_charset, vc);
1182 vc->vc_disp_ctrl = 0;
1183 vc->vc_toggle_meta = 0;
1184 break;
1185 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1186 * Select first alternate font, lets
1187 * chars < 32 be displayed as ROM chars.
1188 */
1189 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1190 vc->vc_disp_ctrl = 1;
1191 vc->vc_toggle_meta = 0;
1192 break;
1193 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1194 * Select second alternate font, toggle
1195 * high bit before displaying as ROM char.
1196 */
1197 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1198 vc->vc_disp_ctrl = 1;
1199 vc->vc_toggle_meta = 1;
1200 break;
1201 case 21:
1202 case 22:
1203 vc->vc_intensity = 1;
1204 break;
1205 case 24:
1206 vc->vc_underline = 0;
1207 break;
1208 case 25:
1209 vc->vc_blink = 0;
1210 break;
1211 case 27:
1212 vc->vc_reverse = 0;
1213 break;
1214 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1215 * Enables underscore, white foreground
1216 * with white underscore (Linux - use
1217 * default foreground).
1218 */
1219 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1220 vc->vc_underline = 1;
1221 break;
1222 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1223 * Disable underline option.
1224 * Reset colour to default? It did this
1225 * before...
1226 */
1227 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1228 vc->vc_underline = 0;
1229 break;
1230 case 49:
1231 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1232 break;
1233 default:
1234 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1235 vc->vc_color = color_table[vc->vc_par[i] - 30]
1236 | (vc->vc_color & 0xf0);
1237 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1238 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1239 | (vc->vc_color & 0x0f);
1240 break;
1241 }
1242 update_attr(vc);
1243}
1244
1245static void respond_string(const char *p, struct tty_struct *tty)
1246{
1247 while (*p) {
1248 tty_insert_flip_char(tty, *p, 0);
1249 p++;
1250 }
1251 con_schedule_flip(tty);
1252}
1253
1254static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1255{
1256 char buf[40];
1257
1258 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1259 respond_string(buf, tty);
1260}
1261
1262static inline void status_report(struct tty_struct *tty)
1263{
1264 respond_string("\033[0n", tty); /* Terminal ok */
1265}
1266
1267static inline void respond_ID(struct tty_struct * tty)
1268{
1269 respond_string(VT102ID, tty);
1270}
1271
1272void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1273{
1274 char buf[8];
1275
1276 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1277 (char)('!' + mry));
1278 respond_string(buf, tty);
1279}
1280
1281/* invoked via ioctl(TIOCLINUX) and through set_selection */
1282int mouse_reporting(void)
1283{
1284 return vc_cons[fg_console].d->vc_report_mouse;
1285}
1286
1287/* console_sem is held */
1288static void set_mode(struct vc_data *vc, int on_off)
1289{
1290 int i;
1291
1292 for (i = 0; i <= vc->vc_npar; i++)
1293 if (vc->vc_ques) {
1294 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1295 case 1: /* Cursor keys send ^[Ox/^[[x */
1296 if (on_off)
1297 set_kbd(vc, decckm);
1298 else
1299 clr_kbd(vc, decckm);
1300 break;
1301 case 3: /* 80/132 mode switch unimplemented */
1302 vc->vc_deccolm = on_off;
1303#if 0
1304 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1305 /* this alone does not suffice; some user mode
1306 utility has to change the hardware regs */
1307#endif
1308 break;
1309 case 5: /* Inverted screen on/off */
1310 if (vc->vc_decscnm != on_off) {
1311 vc->vc_decscnm = on_off;
1312 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1313 update_attr(vc);
1314 }
1315 break;
1316 case 6: /* Origin relative/absolute */
1317 vc->vc_decom = on_off;
1318 gotoxay(vc, 0, 0);
1319 break;
1320 case 7: /* Autowrap on/off */
1321 vc->vc_decawm = on_off;
1322 break;
1323 case 8: /* Autorepeat on/off */
1324 if (on_off)
1325 set_kbd(vc, decarm);
1326 else
1327 clr_kbd(vc, decarm);
1328 break;
1329 case 9:
1330 vc->vc_report_mouse = on_off ? 1 : 0;
1331 break;
1332 case 25: /* Cursor on/off */
1333 vc->vc_deccm = on_off;
1334 break;
1335 case 1000:
1336 vc->vc_report_mouse = on_off ? 2 : 0;
1337 break;
1338 }
1339 } else {
1340 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1341 case 3: /* Monitor (display ctrls) */
1342 vc->vc_disp_ctrl = on_off;
1343 break;
1344 case 4: /* Insert Mode on/off */
1345 vc->vc_decim = on_off;
1346 break;
1347 case 20: /* Lf, Enter == CrLf/Lf */
1348 if (on_off)
1349 set_kbd(vc, lnm);
1350 else
1351 clr_kbd(vc, lnm);
1352 break;
1353 }
1354 }
1355}
1356
1357/* console_sem is held */
1358static void setterm_command(struct vc_data *vc)
1359{
1360 switch(vc->vc_par[0]) {
1361 case 1: /* set color for underline mode */
1362 if (vc->vc_can_do_color &&
1363 vc->vc_par[1] < 16) {
1364 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1365 if (vc->vc_underline)
1366 update_attr(vc);
1367 }
1368 break;
1369 case 2: /* set color for half intensity mode */
1370 if (vc->vc_can_do_color &&
1371 vc->vc_par[1] < 16) {
1372 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1373 if (vc->vc_intensity == 0)
1374 update_attr(vc);
1375 }
1376 break;
1377 case 8: /* store colors as defaults */
1378 vc->vc_def_color = vc->vc_attr;
1379 if (vc->vc_hi_font_mask == 0x100)
1380 vc->vc_def_color >>= 1;
1381 default_attr(vc);
1382 update_attr(vc);
1383 break;
1384 case 9: /* set blanking interval */
1385 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1386 poke_blanked_console();
1387 break;
1388 case 10: /* set bell frequency in Hz */
1389 if (vc->vc_npar >= 1)
1390 vc->vc_bell_pitch = vc->vc_par[1];
1391 else
1392 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1393 break;
1394 case 11: /* set bell duration in msec */
1395 if (vc->vc_npar >= 1)
1396 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1397 vc->vc_par[1] * HZ / 1000 : 0;
1398 else
1399 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1400 break;
1401 case 12: /* bring specified console to the front */
1402 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1403 set_console(vc->vc_par[1] - 1);
1404 break;
1405 case 13: /* unblank the screen */
1406 poke_blanked_console();
1407 break;
1408 case 14: /* set vesa powerdown interval */
1409 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1410 break;
1411 case 15: /* activate the previous console */
1412 set_console(last_console);
1413 break;
1414 }
1415}
1416
1417/* console_sem is held */
1418static void csi_at(struct vc_data *vc, unsigned int nr)
1419{
1420 if (nr > vc->vc_cols - vc->vc_x)
1421 nr = vc->vc_cols - vc->vc_x;
1422 else if (!nr)
1423 nr = 1;
1424 insert_char(vc, nr);
1425}
1426
1427/* console_sem is held */
1428static void csi_L(struct vc_data *vc, unsigned int nr)
1429{
1430 if (nr > vc->vc_rows - vc->vc_y)
1431 nr = vc->vc_rows - vc->vc_y;
1432 else if (!nr)
1433 nr = 1;
1434 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1435 vc->vc_need_wrap = 0;
1436}
1437
1438/* console_sem is held */
1439static void csi_P(struct vc_data *vc, unsigned int nr)
1440{
1441 if (nr > vc->vc_cols - vc->vc_x)
1442 nr = vc->vc_cols - vc->vc_x;
1443 else if (!nr)
1444 nr = 1;
1445 delete_char(vc, nr);
1446}
1447
1448/* console_sem is held */
1449static void csi_M(struct vc_data *vc, unsigned int nr)
1450{
1451 if (nr > vc->vc_rows - vc->vc_y)
1452 nr = vc->vc_rows - vc->vc_y;
1453 else if (!nr)
1454 nr=1;
1455 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1456 vc->vc_need_wrap = 0;
1457}
1458
1459/* console_sem is held (except via vc_init->reset_terminal */
1460static void save_cur(struct vc_data *vc)
1461{
1462 vc->vc_saved_x = vc->vc_x;
1463 vc->vc_saved_y = vc->vc_y;
1464 vc->vc_s_intensity = vc->vc_intensity;
1465 vc->vc_s_underline = vc->vc_underline;
1466 vc->vc_s_blink = vc->vc_blink;
1467 vc->vc_s_reverse = vc->vc_reverse;
1468 vc->vc_s_charset = vc->vc_charset;
1469 vc->vc_s_color = vc->vc_color;
1470 vc->vc_saved_G0 = vc->vc_G0_charset;
1471 vc->vc_saved_G1 = vc->vc_G1_charset;
1472}
1473
1474/* console_sem is held */
1475static void restore_cur(struct vc_data *vc)
1476{
1477 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1478 vc->vc_intensity = vc->vc_s_intensity;
1479 vc->vc_underline = vc->vc_s_underline;
1480 vc->vc_blink = vc->vc_s_blink;
1481 vc->vc_reverse = vc->vc_s_reverse;
1482 vc->vc_charset = vc->vc_s_charset;
1483 vc->vc_color = vc->vc_s_color;
1484 vc->vc_G0_charset = vc->vc_saved_G0;
1485 vc->vc_G1_charset = vc->vc_saved_G1;
1486 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1487 update_attr(vc);
1488 vc->vc_need_wrap = 0;
1489}
1490
1491enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1492 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1493 ESpalette };
1494
1495/* console_sem is held (except via vc_init()) */
1496static void reset_terminal(struct vc_data *vc, int do_clear)
1497{
1498 vc->vc_top = 0;
1499 vc->vc_bottom = vc->vc_rows;
1500 vc->vc_state = ESnormal;
1501 vc->vc_ques = 0;
1502 vc->vc_translate = set_translate(LAT1_MAP, vc);
1503 vc->vc_G0_charset = LAT1_MAP;
1504 vc->vc_G1_charset = GRAF_MAP;
1505 vc->vc_charset = 0;
1506 vc->vc_need_wrap = 0;
1507 vc->vc_report_mouse = 0;
1508 vc->vc_utf = 0;
1509 vc->vc_utf_count = 0;
1510
1511 vc->vc_disp_ctrl = 0;
1512 vc->vc_toggle_meta = 0;
1513
1514 vc->vc_decscnm = 0;
1515 vc->vc_decom = 0;
1516 vc->vc_decawm = 1;
1517 vc->vc_deccm = 1;
1518 vc->vc_decim = 0;
1519
1520 set_kbd(vc, decarm);
1521 clr_kbd(vc, decckm);
1522 clr_kbd(vc, kbdapplic);
1523 clr_kbd(vc, lnm);
1524 kbd_table[vc->vc_num].lockstate = 0;
1525 kbd_table[vc->vc_num].slockstate = 0;
1526 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1527 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1528 /* do not do set_leds here because this causes an endless tasklet loop
1529 when the keyboard hasn't been initialized yet */
1530
1531 vc->vc_cursor_type = CUR_DEFAULT;
1532 vc->vc_complement_mask = vc->vc_s_complement_mask;
1533
1534 default_attr(vc);
1535 update_attr(vc);
1536
1537 vc->vc_tab_stop[0] = 0x01010100;
1538 vc->vc_tab_stop[1] =
1539 vc->vc_tab_stop[2] =
1540 vc->vc_tab_stop[3] =
1541 vc->vc_tab_stop[4] = 0x01010101;
1542
1543 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1544 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1545
1546 gotoxy(vc, 0, 0);
1547 save_cur(vc);
1548 if (do_clear)
1549 csi_J(vc, 2);
1550}
1551
1552/* console_sem is held */
1553static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1554{
1555 /*
1556 * Control characters can be used in the _middle_
1557 * of an escape sequence.
1558 */
1559 switch (c) {
1560 case 0:
1561 return;
1562 case 7:
1563 if (vc->vc_bell_duration)
1564 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1565 return;
1566 case 8:
1567 bs(vc);
1568 return;
1569 case 9:
1570 vc->vc_pos -= (vc->vc_x << 1);
1571 while (vc->vc_x < vc->vc_cols - 1) {
1572 vc->vc_x++;
1573 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1574 break;
1575 }
1576 vc->vc_pos += (vc->vc_x << 1);
1577 return;
1578 case 10: case 11: case 12:
1579 lf(vc);
1580 if (!is_kbd(vc, lnm))
1581 return;
1582 case 13:
1583 cr(vc);
1584 return;
1585 case 14:
1586 vc->vc_charset = 1;
1587 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1588 vc->vc_disp_ctrl = 1;
1589 return;
1590 case 15:
1591 vc->vc_charset = 0;
1592 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1593 vc->vc_disp_ctrl = 0;
1594 return;
1595 case 24: case 26:
1596 vc->vc_state = ESnormal;
1597 return;
1598 case 27:
1599 vc->vc_state = ESesc;
1600 return;
1601 case 127:
1602 del(vc);
1603 return;
1604 case 128+27:
1605 vc->vc_state = ESsquare;
1606 return;
1607 }
1608 switch(vc->vc_state) {
1609 case ESesc:
1610 vc->vc_state = ESnormal;
1611 switch (c) {
1612 case '[':
1613 vc->vc_state = ESsquare;
1614 return;
1615 case ']':
1616 vc->vc_state = ESnonstd;
1617 return;
1618 case '%':
1619 vc->vc_state = ESpercent;
1620 return;
1621 case 'E':
1622 cr(vc);
1623 lf(vc);
1624 return;
1625 case 'M':
1626 ri(vc);
1627 return;
1628 case 'D':
1629 lf(vc);
1630 return;
1631 case 'H':
1632 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1633 return;
1634 case 'Z':
1635 respond_ID(tty);
1636 return;
1637 case '7':
1638 save_cur(vc);
1639 return;
1640 case '8':
1641 restore_cur(vc);
1642 return;
1643 case '(':
1644 vc->vc_state = ESsetG0;
1645 return;
1646 case ')':
1647 vc->vc_state = ESsetG1;
1648 return;
1649 case '#':
1650 vc->vc_state = EShash;
1651 return;
1652 case 'c':
1653 reset_terminal(vc, 1);
1654 return;
1655 case '>': /* Numeric keypad */
1656 clr_kbd(vc, kbdapplic);
1657 return;
1658 case '=': /* Appl. keypad */
1659 set_kbd(vc, kbdapplic);
1660 return;
1661 }
1662 return;
1663 case ESnonstd:
1664 if (c=='P') { /* palette escape sequence */
1665 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1666 vc->vc_par[vc->vc_npar] = 0;
1667 vc->vc_npar = 0;
1668 vc->vc_state = ESpalette;
1669 return;
1670 } else if (c=='R') { /* reset palette */
1671 reset_palette(vc);
1672 vc->vc_state = ESnormal;
1673 } else
1674 vc->vc_state = ESnormal;
1675 return;
1676 case ESpalette:
1677 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1678 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1679 if (vc->vc_npar == 7) {
1680 int i = vc->vc_par[0] * 3, j = 1;
1681 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1682 vc->vc_palette[i++] += vc->vc_par[j++];
1683 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1684 vc->vc_palette[i++] += vc->vc_par[j++];
1685 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1686 vc->vc_palette[i] += vc->vc_par[j];
1687 set_palette(vc);
1688 vc->vc_state = ESnormal;
1689 }
1690 } else
1691 vc->vc_state = ESnormal;
1692 return;
1693 case ESsquare:
1694 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1695 vc->vc_par[vc->vc_npar] = 0;
1696 vc->vc_npar = 0;
1697 vc->vc_state = ESgetpars;
1698 if (c == '[') { /* Function key */
1699 vc->vc_state=ESfunckey;
1700 return;
1701 }
1702 vc->vc_ques = (c == '?');
1703 if (vc->vc_ques)
1704 return;
1705 case ESgetpars:
1706 if (c == ';' && vc->vc_npar < NPAR - 1) {
1707 vc->vc_npar++;
1708 return;
1709 } else if (c>='0' && c<='9') {
1710 vc->vc_par[vc->vc_npar] *= 10;
1711 vc->vc_par[vc->vc_npar] += c - '0';
1712 return;
1713 } else
1714 vc->vc_state = ESgotpars;
1715 case ESgotpars:
1716 vc->vc_state = ESnormal;
1717 switch(c) {
1718 case 'h':
1719 set_mode(vc, 1);
1720 return;
1721 case 'l':
1722 set_mode(vc, 0);
1723 return;
1724 case 'c':
1725 if (vc->vc_ques) {
1726 if (vc->vc_par[0])
1727 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1728 else
1729 vc->vc_cursor_type = CUR_DEFAULT;
1730 return;
1731 }
1732 break;
1733 case 'm':
1734 if (vc->vc_ques) {
1735 clear_selection();
1736 if (vc->vc_par[0])
1737 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1738 else
1739 vc->vc_complement_mask = vc->vc_s_complement_mask;
1740 return;
1741 }
1742 break;
1743 case 'n':
1744 if (!vc->vc_ques) {
1745 if (vc->vc_par[0] == 5)
1746 status_report(tty);
1747 else if (vc->vc_par[0] == 6)
1748 cursor_report(vc, tty);
1749 }
1750 return;
1751 }
1752 if (vc->vc_ques) {
1753 vc->vc_ques = 0;
1754 return;
1755 }
1756 switch(c) {
1757 case 'G': case '`':
1758 if (vc->vc_par[0])
1759 vc->vc_par[0]--;
1760 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1761 return;
1762 case 'A':
1763 if (!vc->vc_par[0])
1764 vc->vc_par[0]++;
1765 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1766 return;
1767 case 'B': case 'e':
1768 if (!vc->vc_par[0])
1769 vc->vc_par[0]++;
1770 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1771 return;
1772 case 'C': case 'a':
1773 if (!vc->vc_par[0])
1774 vc->vc_par[0]++;
1775 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1776 return;
1777 case 'D':
1778 if (!vc->vc_par[0])
1779 vc->vc_par[0]++;
1780 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1781 return;
1782 case 'E':
1783 if (!vc->vc_par[0])
1784 vc->vc_par[0]++;
1785 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1786 return;
1787 case 'F':
1788 if (!vc->vc_par[0])
1789 vc->vc_par[0]++;
1790 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1791 return;
1792 case 'd':
1793 if (vc->vc_par[0])
1794 vc->vc_par[0]--;
1795 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1796 return;
1797 case 'H': case 'f':
1798 if (vc->vc_par[0])
1799 vc->vc_par[0]--;
1800 if (vc->vc_par[1])
1801 vc->vc_par[1]--;
1802 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1803 return;
1804 case 'J':
1805 csi_J(vc, vc->vc_par[0]);
1806 return;
1807 case 'K':
1808 csi_K(vc, vc->vc_par[0]);
1809 return;
1810 case 'L':
1811 csi_L(vc, vc->vc_par[0]);
1812 return;
1813 case 'M':
1814 csi_M(vc, vc->vc_par[0]);
1815 return;
1816 case 'P':
1817 csi_P(vc, vc->vc_par[0]);
1818 return;
1819 case 'c':
1820 if (!vc->vc_par[0])
1821 respond_ID(tty);
1822 return;
1823 case 'g':
1824 if (!vc->vc_par[0])
1825 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1826 else if (vc->vc_par[0] == 3) {
1827 vc->vc_tab_stop[0] =
1828 vc->vc_tab_stop[1] =
1829 vc->vc_tab_stop[2] =
1830 vc->vc_tab_stop[3] =
1831 vc->vc_tab_stop[4] = 0;
1832 }
1833 return;
1834 case 'm':
1835 csi_m(vc);
1836 return;
1837 case 'q': /* DECLL - but only 3 leds */
1838 /* map 0,1,2,3 to 0,1,2,4 */
1839 if (vc->vc_par[0] < 4)
1840 setledstate(kbd_table + vc->vc_num,
1841 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1842 return;
1843 case 'r':
1844 if (!vc->vc_par[0])
1845 vc->vc_par[0]++;
1846 if (!vc->vc_par[1])
1847 vc->vc_par[1] = vc->vc_rows;
1848 /* Minimum allowed region is 2 lines */
1849 if (vc->vc_par[0] < vc->vc_par[1] &&
1850 vc->vc_par[1] <= vc->vc_rows) {
1851 vc->vc_top = vc->vc_par[0] - 1;
1852 vc->vc_bottom = vc->vc_par[1];
1853 gotoxay(vc, 0, 0);
1854 }
1855 return;
1856 case 's':
1857 save_cur(vc);
1858 return;
1859 case 'u':
1860 restore_cur(vc);
1861 return;
1862 case 'X':
1863 csi_X(vc, vc->vc_par[0]);
1864 return;
1865 case '@':
1866 csi_at(vc, vc->vc_par[0]);
1867 return;
1868 case ']': /* setterm functions */
1869 setterm_command(vc);
1870 return;
1871 }
1872 return;
1873 case ESpercent:
1874 vc->vc_state = ESnormal;
1875 switch (c) {
1876 case '@': /* defined in ISO 2022 */
1877 vc->vc_utf = 0;
1878 return;
1879 case 'G': /* prelim official escape code */
1880 case '8': /* retained for compatibility */
1881 vc->vc_utf = 1;
1882 return;
1883 }
1884 return;
1885 case ESfunckey:
1886 vc->vc_state = ESnormal;
1887 return;
1888 case EShash:
1889 vc->vc_state = ESnormal;
1890 if (c == '8') {
1891 /* DEC screen alignment test. kludge :-) */
1892 vc->vc_video_erase_char =
1893 (vc->vc_video_erase_char & 0xff00) | 'E';
1894 csi_J(vc, 2);
1895 vc->vc_video_erase_char =
1896 (vc->vc_video_erase_char & 0xff00) | ' ';
1897 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1898 }
1899 return;
1900 case ESsetG0:
1901 if (c == '0')
1902 vc->vc_G0_charset = GRAF_MAP;
1903 else if (c == 'B')
1904 vc->vc_G0_charset = LAT1_MAP;
1905 else if (c == 'U')
1906 vc->vc_G0_charset = IBMPC_MAP;
1907 else if (c == 'K')
1908 vc->vc_G0_charset = USER_MAP;
1909 if (vc->vc_charset == 0)
1910 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1911 vc->vc_state = ESnormal;
1912 return;
1913 case ESsetG1:
1914 if (c == '0')
1915 vc->vc_G1_charset = GRAF_MAP;
1916 else if (c == 'B')
1917 vc->vc_G1_charset = LAT1_MAP;
1918 else if (c == 'U')
1919 vc->vc_G1_charset = IBMPC_MAP;
1920 else if (c == 'K')
1921 vc->vc_G1_charset = USER_MAP;
1922 if (vc->vc_charset == 1)
1923 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1924 vc->vc_state = ESnormal;
1925 return;
1926 default:
1927 vc->vc_state = ESnormal;
1928 }
1929}
1930
1931/* This is a temporary buffer used to prepare a tty console write
1932 * so that we can easily avoid touching user space while holding the
1933 * console spinlock. It is allocated in con_init and is shared by
1934 * this code and the vc_screen read/write tty calls.
1935 *
1936 * We have to allocate this statically in the kernel data section
1937 * since console_init (and thus con_init) are called before any
1938 * kernel memory allocation is available.
1939 */
1940char con_buf[CON_BUF_SIZE];
1941DECLARE_MUTEX(con_buf_sem);
1942
1943/* acquires console_sem */
1944static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1945{
1946#ifdef VT_BUF_VRAM_ONLY
1947#define FLUSH do { } while(0);
1948#else
1949#define FLUSH if (draw_x >= 0) { \
1950 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1951 draw_x = -1; \
1952 }
1953#endif
1954
1955 int c, tc, ok, n = 0, draw_x = -1;
1956 unsigned int currcons;
1957 unsigned long draw_from = 0, draw_to = 0;
1958 struct vc_data *vc;
1959 u16 himask, charmask;
1960 const unsigned char *orig_buf = NULL;
1961 int orig_count;
1962
1963 if (in_interrupt())
1964 return count;
1965
1966 might_sleep();
1967
1968 acquire_console_sem();
1969 vc = tty->driver_data;
1970 if (vc == NULL) {
1971 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1972 release_console_sem();
1973 return 0;
1974 }
1975
1976 currcons = vc->vc_num;
1977 if (!vc_cons_allocated(currcons)) {
1978 /* could this happen? */
1979 static int error = 0;
1980 if (!error) {
1981 error = 1;
1982 printk("con_write: tty %d not allocated\n", currcons+1);
1983 }
1984 release_console_sem();
1985 return 0;
1986 }
1987 release_console_sem();
1988
1989 orig_buf = buf;
1990 orig_count = count;
1991
1992 /* At this point 'buf' is guaranteed to be a kernel buffer
1993 * and therefore no access to userspace (and therefore sleeping)
1994 * will be needed. The con_buf_sem serializes all tty based
1995 * console rendering and vcs write/read operations. We hold
1996 * the console spinlock during the entire write.
1997 */
1998
1999 acquire_console_sem();
2000
2001 vc = tty->driver_data;
2002 if (vc == NULL) {
2003 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2004 release_console_sem();
2005 goto out;
2006 }
2007
2008 himask = vc->vc_hi_font_mask;
2009 charmask = himask ? 0x1ff : 0xff;
2010
2011 /* undraw cursor first */
2012 if (IS_FG(vc))
2013 hide_cursor(vc);
2014
2015 while (!tty->stopped && count) {
2016 int orig = *buf;
2017 c = orig;
2018 buf++;
2019 n++;
2020 count--;
2021
2022 /* Do no translation at all in control states */
2023 if (vc->vc_state != ESnormal) {
2024 tc = c;
d4328b40 2025 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
1da177e4 2026 /* Combine UTF-8 into Unicode */
d4328b40
AT		 2027 /* Malformed sequences as sequences of replacement glyphs */
2028rescan_last_byte:
1da177e4 2029 if(c > 0x7f) {
d4328b40
AT		 2030 if (vc->vc_utf_count) {
2031 if ((c & 0xc0) == 0x80) {
2032 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2033 if (--vc->vc_utf_count) {
2034 vc->vc_npar++;
2035 continue;
2036 }
2037 tc = c = vc->vc_utf_char;
2038 } else
2039 goto replacement_glyph;
1da177e4 2040 } else {
d4328b40 2041 vc->vc_npar = 0;
1da177e4
LT		 2042 if ((c & 0xe0) == 0xc0) {
2043 vc->vc_utf_count = 1;
2044 vc->vc_utf_char = (c & 0x1f);
2045 } else if ((c & 0xf0) == 0xe0) {
2046 vc->vc_utf_count = 2;
2047 vc->vc_utf_char = (c & 0x0f);
2048 } else if ((c & 0xf8) == 0xf0) {
2049 vc->vc_utf_count = 3;
2050 vc->vc_utf_char = (c & 0x07);
2051 } else if ((c & 0xfc) == 0xf8) {
2052 vc->vc_utf_count = 4;
2053 vc->vc_utf_char = (c & 0x03);
2054 } else if ((c & 0xfe) == 0xfc) {
2055 vc->vc_utf_count = 5;
2056 vc->vc_utf_char = (c & 0x01);
2057 } else
d4328b40 2058 goto replacement_glyph;
1da177e4
LT		 2059 continue;
2060 }
2061 } else {
d4328b40
AT		 2062 if (vc->vc_utf_count)
2063 goto replacement_glyph;
1da177e4 2064 tc = c;
1da177e4 2065 }
d4328b40 2066 } else { /* no utf or alternate charset mode */
1da177e4
LT		 2067 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2068 }
2069
2070 /* If the original code was a control character we
2071 * only allow a glyph to be displayed if the code is
2072 * not normally used (such as for cursor movement) or
2073 * if the disp_ctrl mode has been explicitly enabled.
2074 * Certain characters (as given by the CTRL_ALWAYS
2075 * bitmap) are always displayed as control characters,
2076 * as the console would be pretty useless without
2077 * them; to display an arbitrary font position use the
2078 * direct-to-font zone in UTF-8 mode.
2079 */
2080 ok = tc && (c >= 32 ||
d4328b40
AT		 2081 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2082 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2083 && (c != 127 || vc->vc_disp_ctrl)
2084 && (c != 128+27);
2085
2086 if (vc->vc_state == ESnormal && ok) {
2087 /* Now try to find out how to display it */
2088 tc = conv_uni_to_pc(vc, tc);
d4328b40
AT		 2089 if (tc & ~charmask) {
2090 if ( tc == -4 ) {
1da177e4
LT		 2091 /* If we got -4 (not found) then see if we have
2092 defined a replacement character (U+FFFD) */
d4328b40
AT		 2093replacement_glyph:
2094 tc = conv_uni_to_pc(vc, 0xfffd);
2095 if (!(tc & ~charmask))
2096 goto display_glyph;
2097 } else if ( tc != -3 )
2098 continue; /* nothing to display */
2099 /* no hash table or no replacement --
2100 * hope for the best */
2101 if ( c & ~charmask )
2102 tc = '?';
2103 else
2104 tc = c;
2105 }
1da177e4 2106
d4328b40 2107display_glyph:
1da177e4
LT		 2108 if (vc->vc_need_wrap || vc->vc_decim)
2109 FLUSH
2110 if (vc->vc_need_wrap) {
2111 cr(vc);
2112 lf(vc);
2113 }
2114 if (vc->vc_decim)
2115 insert_char(vc, 1);
2116 scr_writew(himask ?
2117 ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2118 (vc->vc_attr << 8) + tc,
2119 (u16 *) vc->vc_pos);
2120 if (DO_UPDATE(vc) && draw_x < 0) {
2121 draw_x = vc->vc_x;
2122 draw_from = vc->vc_pos;
2123 }
2124 if (vc->vc_x == vc->vc_cols - 1) {
2125 vc->vc_need_wrap = vc->vc_decawm;
2126 draw_to = vc->vc_pos + 2;
2127 } else {
2128 vc->vc_x++;
2129 draw_to = (vc->vc_pos += 2);
2130 }
d4328b40
AT		 2131 if (vc->vc_utf_count) {
2132 if (vc->vc_npar) {
2133 vc->vc_npar--;
2134 goto display_glyph;
2135 }
2136 vc->vc_utf_count = 0;
2137 c = orig;
2138 goto rescan_last_byte;
2139 }
1da177e4
LT		 2140 continue;
2141 }
2142 FLUSH
2143 do_con_trol(tty, vc, orig);
2144 }
2145 FLUSH
2146 console_conditional_schedule();
2147 release_console_sem();
2148
2149out:
2150 return n;
2151#undef FLUSH
2152}
2153
2154/*
2155 * This is the console switching callback.
2156 *
2157 * Doing console switching in a process context allows
2158 * us to do the switches asynchronously (needed when we want
2159 * to switch due to a keyboard interrupt). Synchronization
2160 * with other console code and prevention of re-entrancy is
2161 * ensured with console_sem.
2162 */
2163static void console_callback(void *ignored)
2164{
2165 acquire_console_sem();
2166
2167 if (want_console >= 0) {
2168 if (want_console != fg_console &&
2169 vc_cons_allocated(want_console)) {
2170 hide_cursor(vc_cons[fg_console].d);
2171 change_console(vc_cons[want_console].d);
2172 /* we only changed when the console had already
2173 been allocated - a new console is not created
2174 in an interrupt routine */
2175 }
2176 want_console = -1;
2177 }
2178 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2179 do_poke_blanked_console = 0;
2180 poke_blanked_console();
2181 }
2182 if (scrollback_delta) {
2183 struct vc_data *vc = vc_cons[fg_console].d;
2184 clear_selection();
2185 if (vc->vc_mode == KD_TEXT)
2186 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2187 scrollback_delta = 0;
2188 }
2189 if (blank_timer_expired) {
2190 do_blank_screen(0);
2191 blank_timer_expired = 0;
2192 }
2193
2194 release_console_sem();
2195}
2196
2197void set_console(int nr)
2198{
2199 want_console = nr;
2200 schedule_console_callback();
2201}
2202
2203struct tty_driver *console_driver;
2204
2205#ifdef CONFIG_VT_CONSOLE
2206
2207/*
2208 * Console on virtual terminal
2209 *
2210 * The console must be locked when we get here.
2211 */
2212
2213static void vt_console_print(struct console *co, const char *b, unsigned count)
2214{
2215 struct vc_data *vc = vc_cons[fg_console].d;
2216 unsigned char c;
2217 static unsigned long printing;
2218 const ushort *start;
2219 ushort cnt = 0;
2220 ushort myx;
2221
2222 /* console busy or not yet initialized */
2223 if (!printable || test_and_set_bit(0, &printing))
2224 return;
2225
2226 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2227 vc = vc_cons[kmsg_redirect - 1].d;
2228
2229 /* read `x' only after setting currcons properly (otherwise
2230 the `x' macro will read the x of the foreground console). */
2231 myx = vc->vc_x;
2232
2233 if (!vc_cons_allocated(fg_console)) {
2234 /* impossible */
2235 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2236 goto quit;
2237 }
2238
2239 if (vc->vc_mode != KD_TEXT)
2240 goto quit;
2241
2242 /* undraw cursor first */
2243 if (IS_FG(vc))
2244 hide_cursor(vc);
2245
2246 start = (ushort *)vc->vc_pos;
2247
2248 /* Contrived structure to try to emulate original need_wrap behaviour
2249 * Problems caused when we have need_wrap set on '\n' character */
2250 while (count--) {
2251 c = *b++;
2252 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2253 if (cnt > 0) {
2254 if (CON_IS_VISIBLE(vc))
2255 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2256 vc->vc_x += cnt;
2257 if (vc->vc_need_wrap)
2258 vc->vc_x--;
2259 cnt = 0;
2260 }
2261 if (c == 8) { /* backspace */
2262 bs(vc);
2263 start = (ushort *)vc->vc_pos;
2264 myx = vc->vc_x;
2265 continue;
2266 }
2267 if (c != 13)
2268 lf(vc);
2269 cr(vc);
2270 start = (ushort *)vc->vc_pos;
2271 myx = vc->vc_x;
2272 if (c == 10 || c == 13)
2273 continue;
2274 }
2275 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2276 cnt++;
2277 if (myx == vc->vc_cols - 1) {
2278 vc->vc_need_wrap = 1;
2279 continue;
2280 }
2281 vc->vc_pos += 2;
2282 myx++;
2283 }
2284 if (cnt > 0) {
2285 if (CON_IS_VISIBLE(vc))
2286 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2287 vc->vc_x += cnt;
2288 if (vc->vc_x == vc->vc_cols) {
2289 vc->vc_x--;
2290 vc->vc_need_wrap = 1;
2291 }
2292 }
2293 set_cursor(vc);
2294
2295quit:
2296 clear_bit(0, &printing);
2297}
2298
2299static struct tty_driver *vt_console_device(struct console *c, int *index)
2300{
2301 *index = c->index ? c->index-1 : fg_console;
2302 return console_driver;
2303}
2304
2305static struct console vt_console_driver = {
2306 .name = "tty",
2307 .write = vt_console_print,
2308 .device = vt_console_device,
2309 .unblank = unblank_screen,
2310 .flags = CON_PRINTBUFFER,
2311 .index = -1,
2312};
2313#endif
2314
2315/*
2316 * Handling of Linux-specific VC ioctls
2317 */
2318
2319/*
2320 * Generally a bit racy with respect to console_sem().
2321 *
2322 * There are some functions which don't need it.
2323 *
2324 * There are some functions which can sleep for arbitrary periods
2325 * (paste_selection) but we don't need the lock there anyway.
2326 *
2327 * set_selection has locking, and definitely needs it
2328 */
2329
2330int tioclinux(struct tty_struct *tty, unsigned long arg)
2331{
2332 char type, data;
2333 char __user *p = (char __user *)arg;
2334 int lines;
2335 int ret;
2336
2337 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2338 return -EINVAL;
2339 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2340 return -EPERM;
2341 if (get_user(type, p))
2342 return -EFAULT;
2343 ret = 0;
2344 switch (type)
2345 {
2346 case TIOCL_SETSEL:
2347 acquire_console_sem();
2348 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2349 release_console_sem();
2350 break;
2351 case TIOCL_PASTESEL:
2352 ret = paste_selection(tty);
2353 break;
2354 case TIOCL_UNBLANKSCREEN:
2d237c63 2355 acquire_console_sem();
1da177e4 2356 unblank_screen();
2d237c63 2357 release_console_sem();
1da177e4
LT		 2358 break;
2359 case TIOCL_SELLOADLUT:
2360 ret = sel_loadlut(p);
2361 break;
2362 case TIOCL_GETSHIFTSTATE:
2363
2364 /*
2365 * Make it possible to react to Shift+Mousebutton.
2366 * Note that 'shift_state' is an undocumented
2367 * kernel-internal variable; programs not closely
2368 * related to the kernel should not use this.
2369 */
2370 data = shift_state;
2371 ret = __put_user(data, p);
2372 break;
2373 case TIOCL_GETMOUSEREPORTING:
2374 data = mouse_reporting();
2375 ret = __put_user(data, p);
2376 break;
2377 case TIOCL_SETVESABLANK:
2378 set_vesa_blanking(p);
2379 break;
0ca07731
RW		 2380 case TIOCL_GETKMSGREDIRECT:
2381 data = kmsg_redirect;
2382 ret = __put_user(data, p);
2383 break;
1da177e4
LT		 2384 case TIOCL_SETKMSGREDIRECT:
2385 if (!capable(CAP_SYS_ADMIN)) {
2386 ret = -EPERM;
2387 } else {
2388 if (get_user(data, p+1))
2389 ret = -EFAULT;
2390 else
2391 kmsg_redirect = data;
2392 }
2393 break;
2394 case TIOCL_GETFGCONSOLE:
2395 ret = fg_console;
2396 break;
2397 case TIOCL_SCROLLCONSOLE:
2398 if (get_user(lines, (s32 __user *)(p+4))) {
2399 ret = -EFAULT;
2400 } else {
2401 scrollfront(vc_cons[fg_console].d, lines);
2402 ret = 0;
2403 }
2404 break;
2405 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2406 acquire_console_sem();
1da177e4
LT		 2407 ignore_poke = 1;
2408 do_blank_screen(0);
2d237c63 2409 release_console_sem();
1da177e4
LT		 2410 break;
2411 case TIOCL_BLANKEDSCREEN:
2412 ret = console_blanked;
2413 break;
2414 default:
2415 ret = -EINVAL;
2416 break;
2417 }
2418 return ret;
2419}
2420
2421/*
2422 * /dev/ttyN handling
2423 */
2424
2425static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2426{
2427 int retval;
2428
2429 retval = do_con_write(tty, buf, count);
2430 con_flush_chars(tty);
2431
2432 return retval;
2433}
2434
2435static void con_put_char(struct tty_struct *tty, unsigned char ch)
2436{
2437 if (in_interrupt())
2438 return; /* n_r3964 calls put_char() from interrupt context */
2439 do_con_write(tty, &ch, 1);
2440}
2441
2442static int con_write_room(struct tty_struct *tty)
2443{
2444 if (tty->stopped)
2445 return 0;
2446 return 4096; /* No limit, really; we're not buffering */
2447}
2448
2449static int con_chars_in_buffer(struct tty_struct *tty)
2450{
2451 return 0; /* we're not buffering */
2452}
2453
2454/*
2455 * con_throttle and con_unthrottle are only used for
2456 * paste_selection(), which has to stuff in a large number of
2457 * characters...
2458 */
2459static void con_throttle(struct tty_struct *tty)
2460{
2461}
2462
2463static void con_unthrottle(struct tty_struct *tty)
2464{
2465 struct vc_data *vc = tty->driver_data;
2466
2467 wake_up_interruptible(&vc->paste_wait);
2468}
2469
2470/*
2471 * Turn the Scroll-Lock LED on when the tty is stopped
2472 */
2473static void con_stop(struct tty_struct *tty)
2474{
2475 int console_num;
2476 if (!tty)
2477 return;
2478 console_num = tty->index;
2479 if (!vc_cons_allocated(console_num))
2480 return;
2481 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2482 set_leds();
2483}
2484
2485/*
2486 * Turn the Scroll-Lock LED off when the console is started
2487 */
2488static void con_start(struct tty_struct *tty)
2489{
2490 int console_num;
2491 if (!tty)
2492 return;
2493 console_num = tty->index;
2494 if (!vc_cons_allocated(console_num))
2495 return;
2496 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2497 set_leds();
2498}
2499
2500static void con_flush_chars(struct tty_struct *tty)
2501{
2502 struct vc_data *vc;
2503
2504 if (in_interrupt()) /* from flush_to_ldisc */
2505 return;
2506
2507 /* if we race with con_close(), vt may be null */
2508 acquire_console_sem();
2509 vc = tty->driver_data;
2510 if (vc)
2511 set_cursor(vc);
2512 release_console_sem();
2513}
2514
2515/*
2516 * Allocate the console screen memory.
2517 */
2518static int con_open(struct tty_struct *tty, struct file *filp)
2519{
2520 unsigned int currcons = tty->index;
2521 int ret = 0;
2522
2523 acquire_console_sem();
f786648b 2524 if (tty->driver_data == NULL) {
1da177e4
LT		 2525 ret = vc_allocate(currcons);
2526 if (ret == 0) {
2527 struct vc_data *vc = vc_cons[currcons].d;
2528 tty->driver_data = vc;
2529 vc->vc_tty = tty;
2530
2531 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2532 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2533 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2534 }
2535 release_console_sem();
d09d7ddf 2536 vcs_make_sysfs(tty);
1da177e4
LT		 2537 return ret;
2538 }
2539 }
2540 release_console_sem();
2541 return ret;
2542}
2543
2544/*
70522e12 2545 * We take tty_mutex in here to prevent another thread from coming in via init_dev
1da177e4
LT		 2546 * and taking a ref against the tty while we're in the process of forgetting
2547 * about it and cleaning things up.
2548 *
d09d7ddf 2549 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
1da177e4
LT		 2550 */
2551static void con_close(struct tty_struct *tty, struct file *filp)
2552{
70522e12 2553 mutex_lock(&tty_mutex);
1da177e4
LT		 2554 acquire_console_sem();
2555 if (tty && tty->count == 1) {
2556 struct vc_data *vc = tty->driver_data;
2557
2558 if (vc)
2559 vc->vc_tty = NULL;
2560 tty->driver_data = NULL;
2561 release_console_sem();
d09d7ddf 2562 vcs_remove_sysfs(tty);
70522e12 2563 mutex_unlock(&tty_mutex);
1da177e4 2564 /*
70522e12 2565 * tty_mutex is released, but we still hold BKL, so there is
1da177e4
LT		 2566 * still exclusion against init_dev()
2567 */
2568 return;
2569 }
2570 release_console_sem();
70522e12 2571 mutex_unlock(&tty_mutex);
1da177e4
LT		 2572}
2573
2574static void vc_init(struct vc_data *vc, unsigned int rows,
2575 unsigned int cols, int do_clear)
2576{
2577 int j, k ;
2578
2579 vc->vc_cols = cols;
2580 vc->vc_rows = rows;
2581 vc->vc_size_row = cols << 1;
2582 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2583
2584 set_origin(vc);
2585 vc->vc_pos = vc->vc_origin;
2586 reset_vc(vc);
2587 for (j=k=0; j<16; j++) {
2588 vc->vc_palette[k++] = default_red[j] ;
2589 vc->vc_palette[k++] = default_grn[j] ;
2590 vc->vc_palette[k++] = default_blu[j] ;
2591 }
2592 vc->vc_def_color = 0x07; /* white */
2593 vc->vc_ulcolor = 0x0f; /* bold white */
2594 vc->vc_halfcolor = 0x08; /* grey */
2595 init_waitqueue_head(&vc->paste_wait);
2596 reset_terminal(vc, do_clear);
2597}
2598
2599/*
2600 * This routine initializes console interrupts, and does nothing
2601 * else. If you want the screen to clear, call tty_write with
2602 * the appropriate escape-sequence.
2603 */
2604
2605static int __init con_init(void)
2606{
2607 const char *display_desc = NULL;
2608 struct vc_data *vc;
3e795de7 2609 unsigned int currcons = 0, i;
1da177e4
LT		 2610
2611 acquire_console_sem();
2612
2613 if (conswitchp)
2614 display_desc = conswitchp->con_startup();
2615 if (!display_desc) {
2616 fg_console = 0;
2617 release_console_sem();
2618 return 0;
2619 }
2620
3e795de7
AD		 2621 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2622 struct con_driver *con_driver = &registered_con_driver[i];
2623
2624 if (con_driver->con == NULL) {
2625 con_driver->con = conswitchp;
2626 con_driver->desc = display_desc;
2627 con_driver->flag = CON_DRIVER_FLAG_INIT;
2628 con_driver->first = 0;
2629 con_driver->last = MAX_NR_CONSOLES - 1;
2630 break;
2631 }
2632 }
2633
2634 for (i = 0; i < MAX_NR_CONSOLES; i++)
2635 con_driver_map[i] = conswitchp;
2636
1da177e4
LT		 2637 init_timer(&console_timer);
2638 console_timer.function = blank_screen_t;
2639 if (blankinterval) {
2640 blank_state = blank_normal_wait;
2641 mod_timer(&console_timer, jiffies + blankinterval);
2642 }
2643
2644 /*
2645 * kmalloc is not running yet - we use the bootmem allocator.
2646 */
2647 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2648 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2649 visual_init(vc, currcons, 1);
2650 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2651 vc->vc_kmalloced = 0;
2652 vc_init(vc, vc->vc_rows, vc->vc_cols,
2653 currcons || !vc->vc_sw->con_save_screen);
2654 }
2655 currcons = fg_console = 0;
2656 master_display_fg = vc = vc_cons[currcons].d;
2657 set_origin(vc);
2658 save_screen(vc);
2659 gotoxy(vc, vc->vc_x, vc->vc_y);
2660 csi_J(vc, 0);
2661 update_screen(vc);
2662 printk("Console: %s %s %dx%d",
2663 vc->vc_can_do_color ? "colour" : "mono",
2664 display_desc, vc->vc_cols, vc->vc_rows);
2665 printable = 1;
2666 printk("\n");
2667
2668 release_console_sem();
2669
2670#ifdef CONFIG_VT_CONSOLE
2671 register_console(&vt_console_driver);
2672#endif
2673 return 0;
2674}
2675console_initcall(con_init);
2676
2677static struct tty_operations con_ops = {
2678 .open = con_open,
2679 .close = con_close,
2680 .write = con_write,
2681 .write_room = con_write_room,
2682 .put_char = con_put_char,
2683 .flush_chars = con_flush_chars,
2684 .chars_in_buffer = con_chars_in_buffer,
2685 .ioctl = vt_ioctl,
2686 .stop = con_stop,
2687 .start = con_start,
2688 .throttle = con_throttle,
2689 .unthrottle = con_unthrottle,
2690};
2691
2692int __init vty_init(void)
2693{
2694 vcs_init();
2695
2696 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2697 if (!console_driver)
2698 panic("Couldn't allocate console driver\n");
2699 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2700 console_driver->name = "tty";
2701 console_driver->name_base = 1;
2702 console_driver->major = TTY_MAJOR;
2703 console_driver->minor_start = 1;
2704 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2705 console_driver->init_termios = tty_std_termios;
2706 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2707 tty_set_operations(console_driver, &con_ops);
2708 if (tty_register_driver(console_driver))
2709 panic("Couldn't register console driver\n");
2710
2711 kbd_init();
2712 console_map_init();
2713#ifdef CONFIG_PROM_CONSOLE
2714 prom_con_init();
2715#endif
2716#ifdef CONFIG_MDA_CONSOLE
2717 mda_console_init();
2718#endif
2719 return 0;
2720}
2721
2722#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 2723#include <linux/device.h>
2724
2725static struct class *vtconsole_class;
2726
3e795de7
AD		 2727static int bind_con_driver(const struct consw *csw, int first, int last,
2728 int deflt)
1da177e4 2729{
3e795de7
AD		 2730 struct module *owner = csw->owner;
2731 const char *desc = NULL;
2732 struct con_driver *con_driver;
2733 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2734
1da177e4
LT		 2735 if (!try_module_get(owner))
2736 return -ENODEV;
2737
1c8ce271 2738 acquire_console_sem();
1c8ce271 2739
3e795de7
AD		 2740 /* check if driver is registered */
2741 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2742 con_driver = &registered_con_driver[i];
2743
2744 if (con_driver->con == csw) {
2745 desc = con_driver->desc;
2746 retval = 0;
2747 break;
2748 }
2749 }
2750
2751 if (retval)
2752 goto err;
2753
2754 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2755 csw->con_startup();
2756 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 2757 }
1c8ce271 2758
1da177e4
LT		 2759 if (deflt) {
2760 if (conswitchp)
2761 module_put(conswitchp->owner);
1c8ce271 2762
1da177e4
LT		 2763 __module_get(owner);
2764 conswitchp = csw;
2765 }
2766
3e795de7
AD		 2767 first = max(first, con_driver->first);
2768 last = min(last, con_driver->last);
2769
1da177e4
LT		 2770 for (i = first; i <= last; i++) {
2771 int old_was_color;
2772 struct vc_data *vc = vc_cons[i].d;
2773
2774 if (con_driver_map[i])
2775 module_put(con_driver_map[i]->owner);
2776 __module_get(owner);
2777 con_driver_map[i] = csw;
2778
2779 if (!vc || !vc->vc_sw)
2780 continue;
2781
2782 j = i;
1c8ce271 2783
4ee1acce
DH		 2784 if (CON_IS_VISIBLE(vc)) {
2785 k = i;
1da177e4 2786 save_screen(vc);
4ee1acce
DH		 2787 }
2788
1da177e4
LT		 2789 old_was_color = vc->vc_can_do_color;
2790 vc->vc_sw->con_deinit(vc);
2791 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 2792 visual_init(vc, i, 0);
1c8ce271 2793 set_origin(vc);
1da177e4
LT		 2794 update_attr(vc);
2795
2796 /* If the console changed between mono <-> color, then
2797 * the attributes in the screenbuf will be wrong. The
2798 * following resets all attributes to something sane.
2799 */
2800 if (old_was_color != vc->vc_can_do_color)
2801 clear_buffer_attributes(vc);
1da177e4 2802 }
4ee1acce 2803
1da177e4
LT		 2804 printk("Console: switching ");
2805 if (!deflt)
2806 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 2807 if (j >= 0) {
2808 struct vc_data *vc = vc_cons[j].d;
2809
1da177e4 2810 printk("to %s %s %dx%d\n",
4ee1acce
DH		 2811 vc->vc_can_do_color ? "colour" : "mono",
2812 desc, vc->vc_cols, vc->vc_rows);
2813
2814 if (k >= 0) {
2815 vc = vc_cons[k].d;
2816 update_screen(vc);
2817 }
2818 } else
1da177e4
LT		 2819 printk("to %s\n", desc);
2820
3e795de7
AD		 2821 retval = 0;
2822err:
1da177e4 2823 release_console_sem();
1da177e4 2824 module_put(owner);
3e795de7
AD		 2825 return retval;
2826};
1da177e4 2827
13ae6645
AD		 2828#ifdef CONFIG_VT_HW_CONSOLE_BINDING
2829static int con_is_graphics(const struct consw *csw, int first, int last)
2830{
2831 int i, retval = 0;
2832
2833 for (i = first; i <= last; i++) {
2834 struct vc_data *vc = vc_cons[i].d;
2835
2836 if (vc && vc->vc_mode == KD_GRAPHICS) {
2837 retval = 1;
2838 break;
2839 }
2840 }
2841
2842 return retval;
2843}
2844
3e795de7
AD		 2845static int unbind_con_driver(const struct consw *csw, int first, int last,
2846 int deflt)
1da177e4 2847{
3e795de7
AD		 2848 struct module *owner = csw->owner;
2849 const struct consw *defcsw = NULL;
2850 struct con_driver *con_driver = NULL, *con_back = NULL;
2851 int i, retval = -ENODEV;
1da177e4 2852
3e795de7
AD		 2853 if (!try_module_get(owner))
2854 return -ENODEV;
2855
2856 acquire_console_sem();
2857
2858 /* check if driver is registered and if it is unbindable */
2859 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2860 con_driver = &registered_con_driver[i];
2861
2862 if (con_driver->con == csw &&
6db4063c 2863 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 2864 retval = 0;
2865 break;
2866 }
2867 }
2868
2869 if (retval) {
2870 release_console_sem();
2871 goto err;
2872 }
2873
6db4063c
AD		 2874 retval = -ENODEV;
2875
3e795de7
AD		 2876 /* check if backup driver exists */
2877 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2878 con_back = &registered_con_driver[i];
2879
2880 if (con_back->con &&
6db4063c 2881 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 2882 defcsw = con_back->con;
2883 retval = 0;
2884 break;
2885 }
2886 }
2887
2888 if (retval) {
2889 release_console_sem();
2890 goto err;
2891 }
2892
2893 if (!con_is_bound(csw)) {
2894 release_console_sem();
2895 goto err;
2896 }
2897
2898 first = max(first, con_driver->first);
2899 last = min(last, con_driver->last);
2900
2901 for (i = first; i <= last; i++) {
1da177e4
LT		 2902 if (con_driver_map[i] == csw) {
2903 module_put(csw->owner);
2904 con_driver_map[i] = NULL;
2905 }
3e795de7
AD		 2906 }
2907
2908 if (!con_is_bound(defcsw)) {
6db4063c
AD		 2909 const struct consw *defconsw = conswitchp;
2910
3e795de7
AD		 2911 defcsw->con_startup();
2912 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 2913 /*
2914 * vgacon may change the default driver to point
2915 * to dummycon, we restore it here...
2916 */
2917 conswitchp = defconsw;
3e795de7
AD		 2918 }
2919
2920 if (!con_is_bound(csw))
2921 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2922
2923 release_console_sem();
6db4063c
AD		 2924 /* ignore return value, binding should not fail */
2925 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 2926err:
2927 module_put(owner);
2928 return retval;
2929
2930}
2931
6db4063c
AD		 2932static int vt_bind(struct con_driver *con)
2933{
2934 const struct consw *defcsw = NULL, *csw = NULL;
2935 int i, more = 1, first = -1, last = -1, deflt = 0;
2936
2937 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2938 con_is_graphics(con->con, con->first, con->last))
2939 goto err;
2940
2941 csw = con->con;
2942
2943 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2944 struct con_driver *con = &registered_con_driver[i];
2945
2946 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2947 defcsw = con->con;
2948 break;
2949 }
2950 }
2951
2952 if (!defcsw)
2953 goto err;
2954
2955 while (more) {
2956 more = 0;
2957
2958 for (i = con->first; i <= con->last; i++) {
2959 if (con_driver_map[i] == defcsw) {
2960 if (first == -1)
2961 first = i;
2962 last = i;
2963 more = 1;
2964 } else if (first != -1)
2965 break;
2966 }
2967
2968 if (first == 0 && last == MAX_NR_CONSOLES -1)
2969 deflt = 1;
2970
2971 if (first != -1)
2972 bind_con_driver(csw, first, last, deflt);
2973
2974 first = -1;
2975 last = -1;
2976 deflt = 0;
2977 }
2978
2979err:
2980 return 0;
2981}
2982
2983static int vt_unbind(struct con_driver *con)
2984{
2985 const struct consw *csw = NULL;
2986 int i, more = 1, first = -1, last = -1, deflt = 0;
2987
2988 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2989 con_is_graphics(con->con, con->first, con->last))
2990 goto err;
2991
2992 csw = con->con;
2993
2994 while (more) {
2995 more = 0;
2996
2997 for (i = con->first; i <= con->last; i++) {
2998 if (con_driver_map[i] == csw) {
2999 if (first == -1)
3000 first = i;
3001 last = i;
3002 more = 1;
3003 } else if (first != -1)
3004 break;
3005 }
3006
3007 if (first == 0 && last == MAX_NR_CONSOLES -1)
3008 deflt = 1;
3009
3010 if (first != -1)
3011 unbind_con_driver(csw, first, last, deflt);
3012
3013 first = -1;
3014 last = -1;
3015 deflt = 0;
3016 }
3017
3018err:
3019 return 0;
3020}
13ae6645
AD		 3021#else
3022static inline int vt_bind(struct con_driver *con)
3023{
3024 return 0;
3025}
3026static inline int vt_unbind(struct con_driver *con)
3027{
3028 return 0;
3029}
3030#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c
AD		 3031
3032static ssize_t store_bind(struct class_device *class_device,
3033 const char *buf, size_t count)
3034{
3035 struct con_driver *con = class_get_devdata(class_device);
3036 int bind = simple_strtoul(buf, NULL, 0);
3037
3038 if (bind)
3039 vt_bind(con);
3040 else
3041 vt_unbind(con);
3042
3043 return count;
3044}
3045
3046static ssize_t show_bind(struct class_device *class_device, char *buf)
3047{
3048 struct con_driver *con = class_get_devdata(class_device);
3049 int bind = con_is_bound(con->con);
3050
3051 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3052}
3053
3054static ssize_t show_name(struct class_device *class_device, char *buf)
3055{
3056 struct con_driver *con = class_get_devdata(class_device);
3057
3058 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3059 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3060 con->desc);
3061
3062}
3063
3064static struct class_device_attribute class_device_attrs[] = {
3065 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3066 __ATTR(name, S_IRUGO, show_name, NULL),
3067};
3068
3069static int vtconsole_init_class_device(struct con_driver *con)
3070{
3071 int i;
3072
3073 class_set_devdata(con->class_dev, con);
3074 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3075 class_device_create_file(con->class_dev,
3076 &class_device_attrs[i]);
3077
3078 return 0;
3079}
3080
3081static void vtconsole_deinit_class_device(struct con_driver *con)
3082{
3083 int i;
3084
3085 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3086 class_device_remove_file(con->class_dev,
3087 &class_device_attrs[i]);
3088}
3089
3e795de7
AD		 3090/**
3091 * con_is_bound - checks if driver is bound to the console
3092 * @csw: console driver
3093 *
3094 * RETURNS: zero if unbound, nonzero if bound
3095 *
3096 * Drivers can call this and if zero, they should release
3097 * all resources allocated on con_startup()
3098 */
3099int con_is_bound(const struct consw *csw)
3100{
3101 int i, bound = 0;
3102
3103 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3104 if (con_driver_map[i] == csw) {
3105 bound = 1;
3106 break;
3107 }
3108 }
3109
3110 return bound;
3111}
3112EXPORT_SYMBOL(con_is_bound);
3113
3114/**
3115 * register_con_driver - register console driver to console layer
3116 * @csw: console driver
3117 * @first: the first console to take over, minimum value is 0
3118 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3119 *
3120 * DESCRIPTION: This function registers a console driver which can later
3121 * bind to a range of consoles specified by @first and @last. It will
3122 * also initialize the console driver by calling con_startup().
3123 */
3124int register_con_driver(const struct consw *csw, int first, int last)
3125{
3126 struct module *owner = csw->owner;
3127 struct con_driver *con_driver;
3128 const char *desc;
3129 int i, retval = 0;
3130
3131 if (!try_module_get(owner))
3132 return -ENODEV;
3133
3134 acquire_console_sem();
3135
3136 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3137 con_driver = &registered_con_driver[i];
3138
3139 /* already registered */
3140 if (con_driver->con == csw)
3141 retval = -EINVAL;
3142 }
3143
3144 if (retval)
3145 goto err;
3146
3147 desc = csw->con_startup();
3148
3149 if (!desc)
3150 goto err;
3151
3152 retval = -EINVAL;
3153
3154 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3155 con_driver = &registered_con_driver[i];
3156
3157 if (con_driver->con == NULL) {
3158 con_driver->con = csw;
3159 con_driver->desc = desc;
6db4063c
AD		 3160 con_driver->node = i;
3161 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3162 CON_DRIVER_FLAG_INIT;
3163 con_driver->first = first;
3164 con_driver->last = last;
3165 retval = 0;
3166 break;
3167 }
3168 }
3169
6db4063c
AD		 3170 if (retval)
3171 goto err;
3172
3173 con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3174 MKDEV(0, con_driver->node),
3175 NULL, "vtcon%i",
3176 con_driver->node);
3177
3178 if (IS_ERR(con_driver->class_dev)) {
3179 printk(KERN_WARNING "Unable to create class_device for %s; "
3180 "errno = %ld\n", con_driver->desc,
3181 PTR_ERR(con_driver->class_dev));
3182 con_driver->class_dev = NULL;
3183 } else {
3184 vtconsole_init_class_device(con_driver);
3185 }
3e795de7
AD		 3186err:
3187 release_console_sem();
3188 module_put(owner);
3189 return retval;
3190}
3191EXPORT_SYMBOL(register_con_driver);
3192
3193/**
3194 * unregister_con_driver - unregister console driver from console layer
3195 * @csw: console driver
3196 *
3197 * DESCRIPTION: All drivers that registers to the console layer must
3198 * call this function upon exit, or if the console driver is in a state
3199 * where it won't be able to handle console services, such as the
3200 * framebuffer console without loaded framebuffer drivers.
3201 *
3202 * The driver must unbind first prior to unregistration.
3203 */
3204int unregister_con_driver(const struct consw *csw)
3205{
3206 int i, retval = -ENODEV;
3207
3208 acquire_console_sem();
3209
3210 /* cannot unregister a bound driver */
3211 if (con_is_bound(csw))
3212 goto err;
3213
3214 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3215 struct con_driver *con_driver = &registered_con_driver[i];
3216
3217 if (con_driver->con == csw &&
6db4063c
AD		 3218 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3219 vtconsole_deinit_class_device(con_driver);
3220 class_device_destroy(vtconsole_class,
3221 MKDEV(0, con_driver->node));
3e795de7
AD		 3222 con_driver->con = NULL;
3223 con_driver->desc = NULL;
6db4063c
AD		 3224 con_driver->class_dev = NULL;
3225 con_driver->node = 0;
3e795de7
AD		 3226 con_driver->flag = 0;
3227 con_driver->first = 0;
3228 con_driver->last = 0;
3229 retval = 0;
3230 break;
3231 }
3232 }
3e795de7
AD		 3233err:
3234 release_console_sem();
3235 return retval;
3236}
3237EXPORT_SYMBOL(unregister_con_driver);
3238
3239/*
3240 * If we support more console drivers, this function is used
3241 * when a driver wants to take over some existing consoles
3242 * and become default driver for newly opened ones.
3243 *
3244 * take_over_console is basically a register followed by unbind
3245 */
3246int take_over_console(const struct consw *csw, int first, int last, int deflt)
3247{
3248 int err;
3249
3250 err = register_con_driver(csw, first, last);
3251
3252 if (!err)
6db4063c 3253 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3254
3255 return err;
3256}
3257
3258/*
3259 * give_up_console is a wrapper to unregister_con_driver. It will only
3260 * work if driver is fully unbound.
3261 */
3262void give_up_console(const struct consw *csw)
3263{
3264 unregister_con_driver(csw);
3265}
3266
6db4063c 3267static int __init vtconsole_class_init(void)
3e795de7 3268{
6db4063c 3269 int i;
3e795de7 3270
6db4063c
AD		 3271 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3272 if (IS_ERR(vtconsole_class)) {
3273 printk(KERN_WARNING "Unable to create vt console class; "
3274 "errno = %ld\n", PTR_ERR(vtconsole_class));
3275 vtconsole_class = NULL;
3276 }
3e795de7 3277
6db4063c 3278 /* Add system drivers to sysfs */
3e795de7
AD		 3279 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3280 struct con_driver *con = &registered_con_driver[i];
3281
6db4063c
AD		 3282 if (con->con && !con->class_dev) {
3283 con->class_dev =
3284 class_device_create(vtconsole_class, NULL,
3285 MKDEV(0, con->node), NULL,
3286 "vtcon%i", con->node);
3287
3288 if (IS_ERR(con->class_dev)) {
3289 printk(KERN_WARNING "Unable to create "
3290 "class_device for %s; errno = %ld\n",
3291 con->desc, PTR_ERR(con->class_dev));
3292 con->class_dev = NULL;
3293 } else {
3294 vtconsole_init_class_device(con);
3295 }
3e795de7 3296 }
3e795de7
AD		 3297 }
3298
3e795de7
AD		 3299 return 0;
3300}
6db4063c 3301postcore_initcall(vtconsole_class_init);
3e795de7 3302
1da177e4
LT		 3303#endif
3304
3305/*
3306 * Screen blanking
3307 */
3308
3309static void set_vesa_blanking(char __user *p)
3310{
3311 unsigned int mode;
3312 get_user(mode, p + 1);
3313 vesa_blank_mode = (mode < 4) ? mode : 0;
3314}
3315
1da177e4
LT		 3316void do_blank_screen(int entering_gfx)
3317{
3318 struct vc_data *vc = vc_cons[fg_console].d;
3319 int i;
3320
3321 WARN_CONSOLE_UNLOCKED();
3322
3323 if (console_blanked) {
3324 if (blank_state == blank_vesa_wait) {
3325 blank_state = blank_off;
d060a321 3326 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3327 }
3328 return;
3329 }
3330 if (blank_state != blank_normal_wait)
3331 return;
3332 blank_state = blank_off;
3333
3334 /* entering graphics mode? */
3335 if (entering_gfx) {
3336 hide_cursor(vc);
3337 save_screen(vc);
3338 vc->vc_sw->con_blank(vc, -1, 1);
3339 console_blanked = fg_console + 1;
3340 set_origin(vc);
3341 return;
3342 }
3343
3344 /* don't blank graphics */
3345 if (vc->vc_mode != KD_TEXT) {
3346 console_blanked = fg_console + 1;
3347 return;
3348 }
3349
3350 hide_cursor(vc);
3351 del_timer_sync(&console_timer);
3352 blank_timer_expired = 0;
3353
3354 save_screen(vc);
3355 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3356 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3357 console_blanked = fg_console + 1;
3358 if (i)
3359 set_origin(vc);
3360
3361 if (console_blank_hook && console_blank_hook(1))
3362 return;
3363
d060a321 3364 if (vesa_off_interval && vesa_blank_mode) {
030babac 3365 blank_state = blank_vesa_wait;
1da177e4
LT		 3366 mod_timer(&console_timer, jiffies + vesa_off_interval);
3367 }
1da177e4
LT		 3368}
3369EXPORT_SYMBOL(do_blank_screen);
3370
3371/*
3372 * Called by timer as well as from vt_console_driver
3373 */
3374void do_unblank_screen(int leaving_gfx)
3375{
3376 struct vc_data *vc;
3377
3378 /* This should now always be called from a "sane" (read: can schedule)
3379 * context for the sake of the low level drivers, except in the special
3380 * case of oops_in_progress
3381 */
3382 if (!oops_in_progress)
3383 might_sleep();
3384
3385 WARN_CONSOLE_UNLOCKED();
3386
3387 ignore_poke = 0;
3388 if (!console_blanked)
3389 return;
3390 if (!vc_cons_allocated(fg_console)) {
3391 /* impossible */
3392 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3393 return;
3394 }
3395 vc = vc_cons[fg_console].d;
3396 if (vc->vc_mode != KD_TEXT)
3397 return; /* but leave console_blanked != 0 */
3398
3399 if (blankinterval) {
3400 mod_timer(&console_timer, jiffies + blankinterval);
3401 blank_state = blank_normal_wait;
3402 }
3403
3404 console_blanked = 0;
3405 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3406 /* Low-level driver cannot restore -> do it ourselves */
3407 update_screen(vc);
3408 if (console_blank_hook)
3409 console_blank_hook(0);
3410 set_palette(vc);
3411 set_cursor(vc);
3412}
3413EXPORT_SYMBOL(do_unblank_screen);
3414
3415/*
3416 * This is called by the outside world to cause a forced unblank, mostly for
3417 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3418 * call it with 1 as an argument and so force a mode restore... that may kill
3419 * X or at least garbage the screen but would also make the Oops visible...
3420 */
3421void unblank_screen(void)
3422{
3423 do_unblank_screen(0);
3424}
3425
3426/*
70522e12 3427 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3428 * (console operations can still happen at irq time, but only from printk which
70522e12 3429 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3430 */
3431static void blank_screen_t(unsigned long dummy)
3432{
cc63b1e1
JB		 3433 if (unlikely(!keventd_up())) {
3434 mod_timer(&console_timer, jiffies + blankinterval);
3435 return;
3436 }
1da177e4
LT		 3437 blank_timer_expired = 1;
3438 schedule_work(&console_work);
3439}
3440
3441void poke_blanked_console(void)
3442{
3443 WARN_CONSOLE_UNLOCKED();
3444
3445 /* Add this so we quickly catch whoever might call us in a non
3446 * safe context. Nowadays, unblank_screen() isn't to be called in
3447 * atomic contexts and is allowed to schedule (with the special case
3448 * of oops_in_progress, but that isn't of any concern for this
3449 * function. --BenH.
3450 */
3451 might_sleep();
3452
3453 /* This isn't perfectly race free, but a race here would be mostly harmless,
3454 * at worse, we'll do a spurrious blank and it's unlikely
3455 */
3456 del_timer(&console_timer);
3457 blank_timer_expired = 0;
3458
3459 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3460 return;
3461 if (console_blanked)
3462 unblank_screen();
3463 else if (blankinterval) {
3464 mod_timer(&console_timer, jiffies + blankinterval);
3465 blank_state = blank_normal_wait;
3466 }
3467}
3468
3469/*
3470 * Palettes
3471 */
3472
3473static void set_palette(struct vc_data *vc)
3474{
3475 WARN_CONSOLE_UNLOCKED();
3476
3477 if (vc->vc_mode != KD_GRAPHICS)
3478 vc->vc_sw->con_set_palette(vc, color_table);
3479}
3480
3481static int set_get_cmap(unsigned char __user *arg, int set)
3482{
3483 int i, j, k;
3484
3485 WARN_CONSOLE_UNLOCKED();
3486
3487 for (i = 0; i < 16; i++)
3488 if (set) {
3489 get_user(default_red[i], arg++);
3490 get_user(default_grn[i], arg++);
3491 get_user(default_blu[i], arg++);
3492 } else {
3493 put_user(default_red[i], arg++);
3494 put_user(default_grn[i], arg++);
3495 put_user(default_blu[i], arg++);
3496 }
3497 if (set) {
3498 for (i = 0; i < MAX_NR_CONSOLES; i++)
3499 if (vc_cons_allocated(i)) {
3500 for (j = k = 0; j < 16; j++) {
3501 vc_cons[i].d->vc_palette[k++] = default_red[j];
3502 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3503 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3504 }
3505 set_palette(vc_cons[i].d);
3506 }
3507 }
3508 return 0;
3509}
3510
3511/*
3512 * Load palette into the DAC registers. arg points to a colour
3513 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3514 */
3515
3516int con_set_cmap(unsigned char __user *arg)
3517{
3518 int rc;
3519
3520 acquire_console_sem();
3521 rc = set_get_cmap (arg,1);
3522 release_console_sem();
3523
3524 return rc;
3525}
3526
3527int con_get_cmap(unsigned char __user *arg)
3528{
3529 int rc;
3530
3531 acquire_console_sem();
3532 rc = set_get_cmap (arg,0);
3533 release_console_sem();
3534
3535 return rc;
3536}
3537
3538void reset_palette(struct vc_data *vc)
3539{
3540 int j, k;
3541 for (j=k=0; j<16; j++) {
3542 vc->vc_palette[k++] = default_red[j];
3543 vc->vc_palette[k++] = default_grn[j];
3544 vc->vc_palette[k++] = default_blu[j];
3545 }
3546 set_palette(vc);
3547}
3548
3549/*
3550 * Font switching
3551 *
3552 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3553 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3554 * depending on width) reserved for each character which is kinda wasty, but
3555 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3556 * is upto the actual low-level console-driver convert data into its favorite
3557 * format (maybe we should add a `fontoffset' field to the `display'
3558 * structure so we won't have to convert the fontdata all the time.
3559 * /Jes
3560 */
3561
3562#define max_font_size 65536
3563
3564static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3565{
3566 struct console_font font;
3567 int rc = -EINVAL;
3568 int c;
3569
3570 if (vc->vc_mode != KD_TEXT)
3571 return -EINVAL;
3572
3573 if (op->data) {
3574 font.data = kmalloc(max_font_size, GFP_KERNEL);
3575 if (!font.data)
3576 return -ENOMEM;
3577 } else
3578 font.data = NULL;
3579
3580 acquire_console_sem();
3581 if (vc->vc_sw->con_font_get)
3582 rc = vc->vc_sw->con_font_get(vc, &font);
3583 else
3584 rc = -ENOSYS;
3585 release_console_sem();
3586
3587 if (rc)
3588 goto out;
3589
3590 c = (font.width+7)/8 * 32 * font.charcount;
3591
3592 if (op->data && font.charcount > op->charcount)
3593 rc = -ENOSPC;
3594 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3595 if (font.width > op->width || font.height > op->height)
3596 rc = -ENOSPC;
3597 } else {
3598 if (font.width != 8)
3599 rc = -EIO;
3600 else if ((op->height && font.height > op->height) ||
3601 font.height > 32)
3602 rc = -ENOSPC;
3603 }
3604 if (rc)
3605 goto out;
3606
3607 op->height = font.height;
3608 op->width = font.width;
3609 op->charcount = font.charcount;
3610
3611 if (op->data && copy_to_user(op->data, font.data, c))
3612 rc = -EFAULT;
3613
3614out:
3615 kfree(font.data);
3616 return rc;
3617}
3618
3619static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3620{
3621 struct console_font font;
3622 int rc = -EINVAL;
3623 int size;
3624
3625 if (vc->vc_mode != KD_TEXT)
3626 return -EINVAL;
3627 if (!op->data)
3628 return -EINVAL;
3629 if (op->charcount > 512)
3630 return -EINVAL;
3631 if (!op->height) { /* Need to guess font height [compat] */
3632 int h, i;
3633 u8 __user *charmap = op->data;
3634 u8 tmp;
3635
3636 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3637 so that we can get rid of this soon */
3638 if (!(op->flags & KD_FONT_FLAG_OLD))
3639 return -EINVAL;
3640 for (h = 32; h > 0; h--)
3641 for (i = 0; i < op->charcount; i++) {
3642 if (get_user(tmp, &charmap[32*i+h-1]))
3643 return -EFAULT;
3644 if (tmp)
3645 goto nonzero;
3646 }
3647 return -EINVAL;
3648 nonzero:
3649 op->height = h;
3650 }
3651 if (op->width <= 0 || op->width > 32 || op->height > 32)
3652 return -EINVAL;
3653 size = (op->width+7)/8 * 32 * op->charcount;
3654 if (size > max_font_size)
3655 return -ENOSPC;
3656 font.charcount = op->charcount;
3657 font.height = op->height;
3658 font.width = op->width;
3659 font.data = kmalloc(size, GFP_KERNEL);
3660 if (!font.data)
3661 return -ENOMEM;
3662 if (copy_from_user(font.data, op->data, size)) {
3663 kfree(font.data);
3664 return -EFAULT;
3665 }
3666 acquire_console_sem();
3667 if (vc->vc_sw->con_font_set)
3668 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3669 else
3670 rc = -ENOSYS;
3671 release_console_sem();
3672 kfree(font.data);
3673 return rc;
3674}
3675
3676static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3677{
3678 struct console_font font = {.width = op->width, .height = op->height};
3679 char name[MAX_FONT_NAME];
3680 char *s = name;
3681 int rc;
3682
3683 if (vc->vc_mode != KD_TEXT)
3684 return -EINVAL;
3685
3686 if (!op->data)
3687 s = NULL;
3688 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3689 return -EFAULT;
3690 else
3691 name[MAX_FONT_NAME - 1] = 0;
3692
3693 acquire_console_sem();
3694 if (vc->vc_sw->con_font_default)
3695 rc = vc->vc_sw->con_font_default(vc, &font, s);
3696 else
3697 rc = -ENOSYS;
3698 release_console_sem();
3699 if (!rc) {
3700 op->width = font.width;
3701 op->height = font.height;
3702 }
3703 return rc;
3704}
3705
3706static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3707{
3708 int con = op->height;
3709 int rc;
3710
3711 if (vc->vc_mode != KD_TEXT)
3712 return -EINVAL;
3713
3714 acquire_console_sem();
3715 if (!vc->vc_sw->con_font_copy)
3716 rc = -ENOSYS;
3717 else if (con < 0 || !vc_cons_allocated(con))
3718 rc = -ENOTTY;
3719 else if (con == vc->vc_num) /* nothing to do */
3720 rc = 0;
3721 else
3722 rc = vc->vc_sw->con_font_copy(vc, con);
3723 release_console_sem();
3724 return rc;
3725}
3726
3727int con_font_op(struct vc_data *vc, struct console_font_op *op)
3728{
3729 switch (op->op) {
3730 case KD_FONT_OP_SET:
3731 return con_font_set(vc, op);
3732 case KD_FONT_OP_GET:
3733 return con_font_get(vc, op);
3734 case KD_FONT_OP_SET_DEFAULT:
3735 return con_font_default(vc, op);
3736 case KD_FONT_OP_COPY:
3737 return con_font_copy(vc, op);
3738 }
3739 return -ENOSYS;
3740}
3741
3742/*
3743 * Interface exported to selection and vcs.
3744 */
3745
3746/* used by selection */
3747u16 screen_glyph(struct vc_data *vc, int offset)
3748{
3749 u16 w = scr_readw(screenpos(vc, offset, 1));
3750 u16 c = w & 0xff;
3751
3752 if (w & vc->vc_hi_font_mask)
3753 c |= 0x100;
3754 return c;
3755}
3756
3757/* used by vcs - note the word offset */
3758unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3759{
3760 return screenpos(vc, 2 * w_offset, viewed);
3761}
3762
3763void getconsxy(struct vc_data *vc, unsigned char *p)
3764{
3765 p[0] = vc->vc_x;
3766 p[1] = vc->vc_y;
3767}
3768
3769void putconsxy(struct vc_data *vc, unsigned char *p)
3770{
9477e260 3771 hide_cursor(vc);
1da177e4
LT		 3772 gotoxy(vc, p[0], p[1]);
3773 set_cursor(vc);
3774}
3775
3776u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3777{
3778 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3779 return softcursor_original;
3780 return scr_readw(org);
3781}
3782
3783void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3784{
3785 scr_writew(val, org);
3786 if ((unsigned long)org == vc->vc_pos) {
3787 softcursor_original = -1;
3788 add_softcursor(vc);
3789 }
3790}
3791
3792/*
3793 * Visible symbols for modules
3794 */
3795
3796EXPORT_SYMBOL(color_table);
3797EXPORT_SYMBOL(default_red);
3798EXPORT_SYMBOL(default_grn);
3799EXPORT_SYMBOL(default_blu);
3800EXPORT_SYMBOL(update_region);
3801EXPORT_SYMBOL(redraw_screen);
3802EXPORT_SYMBOL(vc_resize);
ca9bda00 3803EXPORT_SYMBOL(vc_lock_resize);
1da177e4
LT		 3804EXPORT_SYMBOL(fg_console);
3805EXPORT_SYMBOL(console_blank_hook);
3806EXPORT_SYMBOL(console_blanked);
3807EXPORT_SYMBOL(vc_cons);
3808#ifndef VT_SINGLE_DRIVER
3809EXPORT_SYMBOL(take_over_console);
3810EXPORT_SYMBOL(give_up_console);
3811#endif
Linux kernel - Deliverables
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