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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
928e964f
AD		 109#define CON_DRIVER_FLAG_INIT 2
110#define CON_DRIVER_FLAG_ATTR 4
3e795de7
AD		 111
112struct con_driver {
113 const struct consw *con;
114 const char *desc;
6db4063c
AD		 115 struct class_device *class_dev;
116 int node;
3e795de7
AD		 117 int first;
118 int last;
119 int flag;
120};
121
122static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 123const struct consw *conswitchp;
124
125/* A bitmap for codes <32. A bit of 1 indicates that the code
126 * corresponding to that bit number invokes some special action
127 * (such as cursor movement) and should not be displayed as a
128 * glyph unless the disp_ctrl mode is explicitly enabled.
129 */
130#define CTRL_ACTION 0x0d00ff81
131#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
132
133/*
134 * Here is the default bell parameters: 750HZ, 1/8th of a second
135 */
136#define DEFAULT_BELL_PITCH 750
137#define DEFAULT_BELL_DURATION (HZ/8)
138
d09d7ddf
AC		 139extern void vcs_make_sysfs(struct tty_struct *tty);
140extern void vcs_remove_sysfs(struct tty_struct *tty);
1da177e4 141
1da177e4
LT		 142struct vc vc_cons [MAX_NR_CONSOLES];
143
144#ifndef VT_SINGLE_DRIVER
145static const struct consw *con_driver_map[MAX_NR_CONSOLES];
146#endif
147
148static int con_open(struct tty_struct *, struct file *);
149static void vc_init(struct vc_data *vc, unsigned int rows,
150 unsigned int cols, int do_clear);
151static void gotoxy(struct vc_data *vc, int new_x, int new_y);
152static void save_cur(struct vc_data *vc);
153static void reset_terminal(struct vc_data *vc, int do_clear);
154static void con_flush_chars(struct tty_struct *tty);
155static void set_vesa_blanking(char __user *p);
156static void set_cursor(struct vc_data *vc);
157static void hide_cursor(struct vc_data *vc);
158static void console_callback(void *ignored);
159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
162static int printable; /* Is console ready for printing? */
163
164/*
165 * ignore_poke: don't unblank the screen when things are typed. This is
166 * mainly for the privacy of braille terminal users.
167 */
168static int ignore_poke;
169
170int do_poke_blanked_console;
171int console_blanked;
172
173static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
174static int blankinterval = 10*60*HZ;
175static int vesa_off_interval;
176
177static DECLARE_WORK(console_work, console_callback, NULL);
178
179/*
180 * fg_console is the current virtual console,
181 * last_console is the last used one,
182 * want_console is the console we want to switch to,
183 * kmsg_redirect is the console for kernel messages,
184 */
185int fg_console;
186int last_console;
187int want_console = -1;
188int kmsg_redirect;
189
190/*
191 * For each existing display, we have a pointer to console currently visible
192 * on that display, allowing consoles other than fg_console to be refreshed
193 * appropriately. Unless the low-level driver supplies its own display_fg
194 * variable, we use this one for the "master display".
195 */
196static struct vc_data *master_display_fg;
197
198/*
199 * Unfortunately, we need to delay tty echo when we're currently writing to the
200 * console since the code is (and always was) not re-entrant, so we schedule
201 * all flip requests to process context with schedule-task() and run it from
202 * console_callback().
203 */
204
205/*
206 * For the same reason, we defer scrollback to the console callback.
207 */
208static int scrollback_delta;
209
210/*
211 * Hook so that the power management routines can (un)blank
212 * the console on our behalf.
213 */
214int (*console_blank_hook)(int);
215
216static struct timer_list console_timer;
217static int blank_state;
218static int blank_timer_expired;
219enum {
220 blank_off = 0,
221 blank_normal_wait,
222 blank_vesa_wait,
223};
224
225/*
226 * Low-Level Functions
227 */
228
229#define IS_FG(vc) ((vc)->vc_num == fg_console)
230
231#ifdef VT_BUF_VRAM_ONLY
232#define DO_UPDATE(vc) 0
233#else
234#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
235#endif
236
237static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
238{
239 unsigned short *p;
240
241 if (!viewed)
242 p = (unsigned short *)(vc->vc_origin + offset);
243 else if (!vc->vc_sw->con_screen_pos)
244 p = (unsigned short *)(vc->vc_visible_origin + offset);
245 else
246 p = vc->vc_sw->con_screen_pos(vc, offset);
247 return p;
248}
249
250static inline void scrolldelta(int lines)
251{
252 scrollback_delta += lines;
253 schedule_console_callback();
254}
255
256void schedule_console_callback(void)
257{
258 schedule_work(&console_work);
259}
260
261static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
262{
263 unsigned short *d, *s;
264
265 if (t+nr >= b)
266 nr = b - t - 1;
267 if (b > vc->vc_rows || t >= b || nr < 1)
268 return;
269 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
270 return;
271 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
272 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
273 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
274 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
275 vc->vc_size_row * nr);
276}
277
278static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
279{
280 unsigned short *s;
281 unsigned int step;
282
283 if (t+nr >= b)
284 nr = b - t - 1;
285 if (b > vc->vc_rows || t >= b || nr < 1)
286 return;
287 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
288 return;
289 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
290 step = vc->vc_cols * nr;
291 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
292 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
293}
294
295static void do_update_region(struct vc_data *vc, unsigned long start, int count)
296{
297#ifndef VT_BUF_VRAM_ONLY
298 unsigned int xx, yy, offset;
299 u16 *p;
300
301 p = (u16 *) start;
302 if (!vc->vc_sw->con_getxy) {
303 offset = (start - vc->vc_origin) / 2;
304 xx = offset % vc->vc_cols;
305 yy = offset / vc->vc_cols;
306 } else {
307 int nxx, nyy;
308 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
309 xx = nxx; yy = nyy;
310 }
311 for(;;) {
312 u16 attrib = scr_readw(p) & 0xff00;
313 int startx = xx;
314 u16 *q = p;
315 while (xx < vc->vc_cols && count) {
316 if (attrib != (scr_readw(p) & 0xff00)) {
317 if (p > q)
318 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
319 startx = xx;
320 q = p;
321 attrib = scr_readw(p) & 0xff00;
322 }
323 p++;
324 xx++;
325 count--;
326 }
327 if (p > q)
328 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
329 if (!count)
330 break;
331 xx = 0;
332 yy++;
333 if (vc->vc_sw->con_getxy) {
334 p = (u16 *)start;
335 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
336 }
337 }
338#endif
339}
340
341void update_region(struct vc_data *vc, unsigned long start, int count)
342{
343 WARN_CONSOLE_UNLOCKED();
344
345 if (DO_UPDATE(vc)) {
346 hide_cursor(vc);
347 do_update_region(vc, start, count);
348 set_cursor(vc);
349 }
350}
351
352/* Structure of attributes is hardware-dependent */
353
354static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
355{
356 if (vc->vc_sw->con_build_attr)
357 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
358
359#ifndef VT_BUF_VRAM_ONLY
360/*
361 * ++roman: I completely changed the attribute format for monochrome
362 * mode (!can_do_color). The formerly used MDA (monochrome display
363 * adapter) format didn't allow the combination of certain effects.
364 * Now the attribute is just a bit vector:
365 * Bit 0..1: intensity (0..2)
366 * Bit 2 : underline
367 * Bit 3 : reverse
368 * Bit 7 : blink
369 */
370 {
371 u8 a = vc->vc_color;
372 if (!vc->vc_can_do_color)
373 return _intensity |
374 (_underline ? 4 : 0) |
375 (_reverse ? 8 : 0) |
376 (_blink ? 0x80 : 0);
377 if (_underline)
378 a = (a & 0xf0) | vc->vc_ulcolor;
379 else if (_intensity == 0)
380 a = (a & 0xf0) | vc->vc_ulcolor;
381 if (_reverse)
382 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
383 if (_blink)
384 a ^= 0x80;
385 if (_intensity == 2)
386 a ^= 0x08;
387 if (vc->vc_hi_font_mask == 0x100)
388 a <<= 1;
389 return a;
390 }
391#else
392 return 0;
393#endif
394}
395
396static void update_attr(struct vc_data *vc)
397{
398 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
399 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
400}
401
402/* Note: inverting the screen twice should revert to the original state */
403void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
404{
405 unsigned short *p;
406
407 WARN_CONSOLE_UNLOCKED();
408
409 count /= 2;
410 p = screenpos(vc, offset, viewed);
411 if (vc->vc_sw->con_invert_region)
412 vc->vc_sw->con_invert_region(vc, p, count);
413#ifndef VT_BUF_VRAM_ONLY
414 else {
415 u16 *q = p;
416 int cnt = count;
417 u16 a;
418
419 if (!vc->vc_can_do_color) {
420 while (cnt--) {
421 a = scr_readw(q);
422 a ^= 0x0800;
423 scr_writew(a, q);
424 q++;
425 }
426 } else if (vc->vc_hi_font_mask == 0x100) {
427 while (cnt--) {
428 a = scr_readw(q);
429 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
430 scr_writew(a, q);
431 q++;
432 }
433 } else {
434 while (cnt--) {
435 a = scr_readw(q);
436 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
437 scr_writew(a, q);
438 q++;
439 }
440 }
441 }
442#endif
443 if (DO_UPDATE(vc))
444 do_update_region(vc, (unsigned long) p, count);
445}
446
447/* used by selection: complement pointer position */
448void complement_pos(struct vc_data *vc, int offset)
449{
414edcd3 450 static int old_offset = -1;
1da177e4
LT		 451 static unsigned short old;
452 static unsigned short oldx, oldy;
453
454 WARN_CONSOLE_UNLOCKED();
455
414edcd3
AD		 456 if (old_offset != -1 && old_offset >= 0 &&
457 old_offset < vc->vc_screenbuf_size) {
458 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 459 if (DO_UPDATE(vc))
460 vc->vc_sw->con_putc(vc, old, oldy, oldx);
461 }
414edcd3
AD		 462
463 old_offset = offset;
464
465 if (offset != -1 && offset >= 0 &&
466 offset < vc->vc_screenbuf_size) {
1da177e4 467 unsigned short new;
414edcd3 468 unsigned short *p;
1da177e4
LT		 469 p = screenpos(vc, offset, 1);
470 old = scr_readw(p);
471 new = old ^ vc->vc_complement_mask;
472 scr_writew(new, p);
473 if (DO_UPDATE(vc)) {
474 oldx = (offset >> 1) % vc->vc_cols;
475 oldy = (offset >> 1) / vc->vc_cols;
476 vc->vc_sw->con_putc(vc, new, oldy, oldx);
477 }
478 }
414edcd3 479
1da177e4
LT		 480}
481
482static void insert_char(struct vc_data *vc, unsigned int nr)
483{
484 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
485
486 p = q + vc->vc_cols - nr - vc->vc_x;
487 while (--p >= q)
488 scr_writew(scr_readw(p), p + nr);
489 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
490 vc->vc_need_wrap = 0;
491 if (DO_UPDATE(vc)) {
492 unsigned short oldattr = vc->vc_attr;
493 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
494 vc->vc_cols - vc->vc_x - nr);
495 vc->vc_attr = vc->vc_video_erase_char >> 8;
496 while (nr--)
497 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
498 vc->vc_attr = oldattr;
499 }
500}
501
502static void delete_char(struct vc_data *vc, unsigned int nr)
503{
504 unsigned int i = vc->vc_x;
505 unsigned short *p = (unsigned short *)vc->vc_pos;
506
507 while (++i <= vc->vc_cols - nr) {
508 scr_writew(scr_readw(p+nr), p);
509 p++;
510 }
511 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
512 vc->vc_need_wrap = 0;
513 if (DO_UPDATE(vc)) {
514 unsigned short oldattr = vc->vc_attr;
515 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
516 vc->vc_cols - vc->vc_x - nr);
517 vc->vc_attr = vc->vc_video_erase_char >> 8;
518 while (nr--)
519 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
520 vc->vc_cols - 1 - nr);
521 vc->vc_attr = oldattr;
522 }
523}
524
525static int softcursor_original;
526
527static void add_softcursor(struct vc_data *vc)
528{
529 int i = scr_readw((u16 *) vc->vc_pos);
530 u32 type = vc->vc_cursor_type;
531
532 if (! (type & 0x10)) return;
533 if (softcursor_original != -1) return;
534 softcursor_original = i;
535 i |= ((type >> 8) & 0xff00 );
536 i ^= ((type) & 0xff00 );
537 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
538 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
539 scr_writew(i, (u16 *) vc->vc_pos);
540 if (DO_UPDATE(vc))
541 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
542}
543
544static void hide_softcursor(struct vc_data *vc)
545{
546 if (softcursor_original != -1) {
547 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
548 if (DO_UPDATE(vc))
549 vc->vc_sw->con_putc(vc, softcursor_original,
550 vc->vc_y, vc->vc_x);
551 softcursor_original = -1;
552 }
553}
554
555static void hide_cursor(struct vc_data *vc)
556{
557 if (vc == sel_cons)
558 clear_selection();
559 vc->vc_sw->con_cursor(vc, CM_ERASE);
560 hide_softcursor(vc);
561}
562
563static void set_cursor(struct vc_data *vc)
564{
565 if (!IS_FG(vc) || console_blanked ||
566 vc->vc_mode == KD_GRAPHICS)
567 return;
568 if (vc->vc_deccm) {
569 if (vc == sel_cons)
570 clear_selection();
571 add_softcursor(vc);
572 if ((vc->vc_cursor_type & 0x0f) != 1)
573 vc->vc_sw->con_cursor(vc, CM_DRAW);
574 } else
575 hide_cursor(vc);
576}
577
578static void set_origin(struct vc_data *vc)
579{
580 WARN_CONSOLE_UNLOCKED();
581
582 if (!CON_IS_VISIBLE(vc) ||
583 !vc->vc_sw->con_set_origin ||
584 !vc->vc_sw->con_set_origin(vc))
585 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
586 vc->vc_visible_origin = vc->vc_origin;
587 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
588 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
589}
590
591static inline void save_screen(struct vc_data *vc)
592{
593 WARN_CONSOLE_UNLOCKED();
594
595 if (vc->vc_sw->con_save_screen)
596 vc->vc_sw->con_save_screen(vc);
597}
598
599/*
600 * Redrawing of screen
601 */
602
603static void clear_buffer_attributes(struct vc_data *vc)
604{
605 unsigned short *p = (unsigned short *)vc->vc_origin;
606 int count = vc->vc_screenbuf_size / 2;
607 int mask = vc->vc_hi_font_mask | 0xff;
608
609 for (; count > 0; count--, p++) {
610 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
611 }
612}
613
614void redraw_screen(struct vc_data *vc, int is_switch)
615{
616 int redraw = 0;
617
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!vc) {
621 /* strange ... */
622 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
623 return;
624 }
625
626 if (is_switch) {
627 struct vc_data *old_vc = vc_cons[fg_console].d;
628 if (old_vc == vc)
629 return;
630 if (!CON_IS_VISIBLE(vc))
631 redraw = 1;
632 *vc->vc_display_fg = vc;
633 fg_console = vc->vc_num;
634 hide_cursor(old_vc);
635 if (!CON_IS_VISIBLE(old_vc)) {
636 save_screen(old_vc);
637 set_origin(old_vc);
638 }
639 } else {
640 hide_cursor(vc);
641 redraw = 1;
642 }
643
644 if (redraw) {
645 int update;
646 int old_was_color = vc->vc_can_do_color;
647
648 set_origin(vc);
649 update = vc->vc_sw->con_switch(vc);
650 set_palette(vc);
651 /*
652 * If console changed from mono<->color, the best we can do
653 * is to clear the buffer attributes. As it currently stands,
654 * rebuilding new attributes from the old buffer is not doable
655 * without overly complex code.
656 */
657 if (old_was_color != vc->vc_can_do_color) {
658 update_attr(vc);
659 clear_buffer_attributes(vc);
660 }
661 if (update && vc->vc_mode != KD_GRAPHICS)
662 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
663 }
664 set_cursor(vc);
665 if (is_switch) {
666 set_leds();
667 compute_shiftstate();
668 }
669}
670
671/*
672 * Allocation, freeing and resizing of VTs.
673 */
674
675int vc_cons_allocated(unsigned int i)
676{
677 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
678}
679
680static void visual_init(struct vc_data *vc, int num, int init)
681{
682 /* ++Geert: vc->vc_sw->con_init determines console size */
683 if (vc->vc_sw)
684 module_put(vc->vc_sw->owner);
685 vc->vc_sw = conswitchp;
686#ifndef VT_SINGLE_DRIVER
687 if (con_driver_map[num])
688 vc->vc_sw = con_driver_map[num];
689#endif
690 __module_get(vc->vc_sw->owner);
691 vc->vc_num = num;
692 vc->vc_display_fg = &master_display_fg;
693 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
694 vc->vc_uni_pagedir = 0;
695 vc->vc_hi_font_mask = 0;
696 vc->vc_complement_mask = 0;
697 vc->vc_can_do_color = 0;
698 vc->vc_sw->con_init(vc, init);
699 if (!vc->vc_complement_mask)
700 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
701 vc->vc_s_complement_mask = vc->vc_complement_mask;
702 vc->vc_size_row = vc->vc_cols << 1;
703 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
704}
705
706int vc_allocate(unsigned int currcons) /* return 0 on success */
707{
708 WARN_CONSOLE_UNLOCKED();
709
710 if (currcons >= MAX_NR_CONSOLES)
711 return -ENXIO;
712 if (!vc_cons[currcons].d) {
713 struct vc_data *vc;
714
715 /* prevent users from taking too much memory */
716 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
717 return -EPERM;
718
719 /* due to the granularity of kmalloc, we waste some memory here */
720 /* the alloc is done in two steps, to optimize the common situation
721 of a 25x80 console (structsize=216, screenbuf_size=4000) */
722 /* although the numbers above are not valid since long ago, the
723 point is still up-to-date and the comment still has its value
724 even if only as a historical artifact. --mj, July 1998 */
725 vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
726 if (!vc)
727 return -ENOMEM;
728 memset(vc, 0, sizeof(*vc));
729 vc_cons[currcons].d = vc;
730 visual_init(vc, currcons, 1);
731 if (!*vc->vc_uni_pagedir_loc)
732 con_set_default_unimap(vc);
254e948b
CM		 733 if (!vc->vc_kmalloced)
734 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 735 if (!vc->vc_screenbuf) {
736 kfree(vc);
737 vc_cons[currcons].d = NULL;
738 return -ENOMEM;
739 }
740 vc->vc_kmalloced = 1;
741 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
742 }
743 return 0;
744}
745
746static inline int resize_screen(struct vc_data *vc, int width, int height)
747{
748 /* Resizes the resolution of the display adapater */
749 int err = 0;
750
751 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
752 err = vc->vc_sw->con_resize(vc, width, height);
753 return err;
754}
755
756/*
757 * Change # of rows and columns (0 means unchanged/the size of fg_console)
758 * [this is to be used together with some user program
759 * like resize that changes the hardware videomode]
760 */
761#define VC_RESIZE_MAXCOL (32767)
762#define VC_RESIZE_MAXROW (32767)
763int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
764{
765 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
766 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
767 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
3b41dc1a 768 unsigned int end;
1da177e4
LT		 769 unsigned short *newscreen;
770
771 WARN_CONSOLE_UNLOCKED();
772
773 if (!vc)
774 return -ENXIO;
775
776 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
777 return -EINVAL;
778
779 new_cols = (cols ? cols : vc->vc_cols);
780 new_rows = (lines ? lines : vc->vc_rows);
781 new_row_size = new_cols << 1;
782 new_screen_size = new_row_size * new_rows;
783
784 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
785 return 0;
786
787 newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
788 if (!newscreen)
789 return -ENOMEM;
790
791 old_rows = vc->vc_rows;
792 old_cols = vc->vc_cols;
793 old_row_size = vc->vc_size_row;
794 old_screen_size = vc->vc_screenbuf_size;
795
796 err = resize_screen(vc, new_cols, new_rows);
797 if (err) {
798 kfree(newscreen);
799 return err;
800 }
801
802 vc->vc_rows = new_rows;
803 vc->vc_cols = new_cols;
804 vc->vc_size_row = new_row_size;
805 vc->vc_screenbuf_size = new_screen_size;
806
807 rlth = min(old_row_size, new_row_size);
808 rrem = new_row_size - rlth;
809 old_origin = vc->vc_origin;
810 new_origin = (long) newscreen;
811 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 812
813 if (vc->vc_y > new_rows) {
814 if (old_rows - vc->vc_y < new_rows) {
815 /*
816 * Cursor near the bottom, copy contents from the
817 * bottom of buffer
818 */
819 old_origin += (old_rows - new_rows) * old_row_size;
820 end = vc->vc_scr_end;
821 } else {
822 /*
823 * Cursor is in no man's land, copy 1/2 screenful
824 * from the top and bottom of cursor position
825 */
826 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 827 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 828 }
829 } else
830 /*
831 * Cursor near the top, copy contents from the top of buffer
832 */
065d9cac
AD		 833 end = (old_rows > new_rows) ? old_origin +
834 (old_row_size * new_rows) :
3b41dc1a 835 vc->vc_scr_end;
1da177e4
LT		 836
837 update_attr(vc);
838
3b41dc1a
AD		 839 while (old_origin < end) {
840 scr_memcpyw((unsigned short *) new_origin,
841 (unsigned short *) old_origin, rlth);
1da177e4 842 if (rrem)
3b41dc1a
AD		 843 scr_memsetw((void *)(new_origin + rlth),
844 vc->vc_video_erase_char, rrem);
1da177e4
LT		 845 old_origin += old_row_size;
846 new_origin += new_row_size;
847 }
848 if (new_scr_end > new_origin)
3b41dc1a
AD		 849 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
850 new_scr_end - new_origin);
1da177e4
LT		 851 if (vc->vc_kmalloced)
852 kfree(vc->vc_screenbuf);
853 vc->vc_screenbuf = newscreen;
854 vc->vc_kmalloced = 1;
855 vc->vc_screenbuf_size = new_screen_size;
856 set_origin(vc);
857
858 /* do part of a reset_terminal() */
859 vc->vc_top = 0;
860 vc->vc_bottom = vc->vc_rows;
861 gotoxy(vc, vc->vc_x, vc->vc_y);
862 save_cur(vc);
863
864 if (vc->vc_tty) {
865 struct winsize ws, *cws = &vc->vc_tty->winsize;
866
867 memset(&ws, 0, sizeof(ws));
868 ws.ws_row = vc->vc_rows;
869 ws.ws_col = vc->vc_cols;
870 ws.ws_ypixel = vc->vc_scan_lines;
871 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
872 vc->vc_tty->pgrp > 0)
873 kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
874 *cws = ws;
875 }
876
877 if (CON_IS_VISIBLE(vc))
878 update_screen(vc);
879 return err;
880}
881
ca9bda00
AC		 882int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
883{
884 int rc;
885
886 acquire_console_sem();
887 rc = vc_resize(vc, cols, lines);
888 release_console_sem();
889 return rc;
890}
1da177e4 891
ca9bda00 892void vc_deallocate(unsigned int currcons)
1da177e4
LT		 893{
894 WARN_CONSOLE_UNLOCKED();
895
896 if (vc_cons_allocated(currcons)) {
897 struct vc_data *vc = vc_cons[currcons].d;
898 vc->vc_sw->con_deinit(vc);
bde0d2c9 899 put_pid(vc->vt_pid);
d459ec0b 900 module_put(vc->vc_sw->owner);
1da177e4
LT		 901 if (vc->vc_kmalloced)
902 kfree(vc->vc_screenbuf);
903 if (currcons >= MIN_NR_CONSOLES)
904 kfree(vc);
905 vc_cons[currcons].d = NULL;
906 }
907}
908
909/*
910 * VT102 emulator
911 */
912
913#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
914#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
915#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
916
917#define decarm VC_REPEAT
918#define decckm VC_CKMODE
919#define kbdapplic VC_APPLIC
920#define lnm VC_CRLF
921
922/*
923 * this is what the terminal answers to a ESC-Z or csi0c query.
924 */
925#define VT100ID "\033[?1;2c"
926#define VT102ID "\033[?6c"
927
928unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
929 8,12,10,14, 9,13,11,15 };
930
931/* the default colour table, for VGA+ colour systems */
932int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
933 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
934int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
935 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
936int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
937 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
938
939/*
940 * gotoxy() must verify all boundaries, because the arguments
941 * might also be negative. If the given position is out of
942 * bounds, the cursor is placed at the nearest margin.
943 */
944static void gotoxy(struct vc_data *vc, int new_x, int new_y)
945{
946 int min_y, max_y;
947
948 if (new_x < 0)
949 vc->vc_x = 0;
950 else {
951 if (new_x >= vc->vc_cols)
952 vc->vc_x = vc->vc_cols - 1;
953 else
954 vc->vc_x = new_x;
955 }
956
957 if (vc->vc_decom) {
958 min_y = vc->vc_top;
959 max_y = vc->vc_bottom;
960 } else {
961 min_y = 0;
962 max_y = vc->vc_rows;
963 }
964 if (new_y < min_y)
965 vc->vc_y = min_y;
966 else if (new_y >= max_y)
967 vc->vc_y = max_y - 1;
968 else
969 vc->vc_y = new_y;
970 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
971 vc->vc_need_wrap = 0;
972}
973
974/* for absolute user moves, when decom is set */
975static void gotoxay(struct vc_data *vc, int new_x, int new_y)
976{
977 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
978}
979
980void scrollback(struct vc_data *vc, int lines)
981{
982 if (!lines)
983 lines = vc->vc_rows / 2;
984 scrolldelta(-lines);
985}
986
987void scrollfront(struct vc_data *vc, int lines)
988{
989 if (!lines)
990 lines = vc->vc_rows / 2;
991 scrolldelta(lines);
992}
993
994static void lf(struct vc_data *vc)
995{
996 /* don't scroll if above bottom of scrolling region, or
997 * if below scrolling region
998 */
999 if (vc->vc_y + 1 == vc->vc_bottom)
1000 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1001 else if (vc->vc_y < vc->vc_rows - 1) {
1002 vc->vc_y++;
1003 vc->vc_pos += vc->vc_size_row;
1004 }
1005 vc->vc_need_wrap = 0;
1006}
1007
1008static void ri(struct vc_data *vc)
1009{
1010 /* don't scroll if below top of scrolling region, or
1011 * if above scrolling region
1012 */
1013 if (vc->vc_y == vc->vc_top)
1014 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1015 else if (vc->vc_y > 0) {
1016 vc->vc_y--;
1017 vc->vc_pos -= vc->vc_size_row;
1018 }
1019 vc->vc_need_wrap = 0;
1020}
1021
1022static inline void cr(struct vc_data *vc)
1023{
1024 vc->vc_pos -= vc->vc_x << 1;
1025 vc->vc_need_wrap = vc->vc_x = 0;
1026}
1027
1028static inline void bs(struct vc_data *vc)
1029{
1030 if (vc->vc_x) {
1031 vc->vc_pos -= 2;
1032 vc->vc_x--;
1033 vc->vc_need_wrap = 0;
1034 }
1035}
1036
1037static inline void del(struct vc_data *vc)
1038{
1039 /* ignored */
1040}
1041
1042static void csi_J(struct vc_data *vc, int vpar)
1043{
1044 unsigned int count;
1045 unsigned short * start;
1046
1047 switch (vpar) {
1048 case 0: /* erase from cursor to end of display */
1049 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1050 start = (unsigned short *)vc->vc_pos;
1051 if (DO_UPDATE(vc)) {
1052 /* do in two stages */
1053 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1054 vc->vc_cols - vc->vc_x);
1055 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1056 vc->vc_rows - vc->vc_y - 1,
1057 vc->vc_cols);
1058 }
1059 break;
1060 case 1: /* erase from start to cursor */
1061 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1062 start = (unsigned short *)vc->vc_origin;
1063 if (DO_UPDATE(vc)) {
1064 /* do in two stages */
1065 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1066 vc->vc_cols);
1067 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1068 vc->vc_x + 1);
1069 }
1070 break;
1071 case 2: /* erase whole display */
1072 count = vc->vc_cols * vc->vc_rows;
1073 start = (unsigned short *)vc->vc_origin;
1074 if (DO_UPDATE(vc))
1075 vc->vc_sw->con_clear(vc, 0, 0,
1076 vc->vc_rows,
1077 vc->vc_cols);
1078 break;
1079 default:
1080 return;
1081 }
1082 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1083 vc->vc_need_wrap = 0;
1084}
1085
1086static void csi_K(struct vc_data *vc, int vpar)
1087{
1088 unsigned int count;
1089 unsigned short * start;
1090
1091 switch (vpar) {
1092 case 0: /* erase from cursor to end of line */
1093 count = vc->vc_cols - vc->vc_x;
1094 start = (unsigned short *)vc->vc_pos;
1095 if (DO_UPDATE(vc))
1096 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1097 vc->vc_cols - vc->vc_x);
1098 break;
1099 case 1: /* erase from start of line to cursor */
1100 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1101 count = vc->vc_x + 1;
1102 if (DO_UPDATE(vc))
1103 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1104 vc->vc_x + 1);
1105 break;
1106 case 2: /* erase whole line */
1107 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1108 count = vc->vc_cols;
1109 if (DO_UPDATE(vc))
1110 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1111 vc->vc_cols);
1112 break;
1113 default:
1114 return;
1115 }
1116 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1117 vc->vc_need_wrap = 0;
1118}
1119
1120static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1121{ /* not vt100? */
1122 int count;
1123
1124 if (!vpar)
1125 vpar++;
1126 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1127
1128 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1129 if (DO_UPDATE(vc))
1130 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1131 vc->vc_need_wrap = 0;
1132}
1133
1134static void default_attr(struct vc_data *vc)
1135{
1136 vc->vc_intensity = 1;
1137 vc->vc_underline = 0;
1138 vc->vc_reverse = 0;
1139 vc->vc_blink = 0;
1140 vc->vc_color = vc->vc_def_color;
1141}
1142
1143/* console_sem is held */
1144static void csi_m(struct vc_data *vc)
1145{
1146 int i;
1147
1148 for (i = 0; i <= vc->vc_npar; i++)
1149 switch (vc->vc_par[i]) {
1150 case 0: /* all attributes off */
1151 default_attr(vc);
1152 break;
1153 case 1:
1154 vc->vc_intensity = 2;
1155 break;
1156 case 2:
1157 vc->vc_intensity = 0;
1158 break;
1159 case 4:
1160 vc->vc_underline = 1;
1161 break;
1162 case 5:
1163 vc->vc_blink = 1;
1164 break;
1165 case 7:
1166 vc->vc_reverse = 1;
1167 break;
1168 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1169 * Select primary font, don't display
1170 * control chars if defined, don't set
1171 * bit 8 on output.
1172 */
1173 vc->vc_translate = set_translate(vc->vc_charset == 0
1174 ? vc->vc_G0_charset
1175 : vc->vc_G1_charset, vc);
1176 vc->vc_disp_ctrl = 0;
1177 vc->vc_toggle_meta = 0;
1178 break;
1179 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1180 * Select first alternate font, lets
1181 * chars < 32 be displayed as ROM chars.
1182 */
1183 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1184 vc->vc_disp_ctrl = 1;
1185 vc->vc_toggle_meta = 0;
1186 break;
1187 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1188 * Select second alternate font, toggle
1189 * high bit before displaying as ROM char.
1190 */
1191 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1192 vc->vc_disp_ctrl = 1;
1193 vc->vc_toggle_meta = 1;
1194 break;
1195 case 21:
1196 case 22:
1197 vc->vc_intensity = 1;
1198 break;
1199 case 24:
1200 vc->vc_underline = 0;
1201 break;
1202 case 25:
1203 vc->vc_blink = 0;
1204 break;
1205 case 27:
1206 vc->vc_reverse = 0;
1207 break;
1208 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1209 * Enables underscore, white foreground
1210 * with white underscore (Linux - use
1211 * default foreground).
1212 */
1213 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1214 vc->vc_underline = 1;
1215 break;
1216 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1217 * Disable underline option.
1218 * Reset colour to default? It did this
1219 * before...
1220 */
1221 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1222 vc->vc_underline = 0;
1223 break;
1224 case 49:
1225 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1226 break;
1227 default:
1228 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1229 vc->vc_color = color_table[vc->vc_par[i] - 30]
1230 | (vc->vc_color & 0xf0);
1231 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1232 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1233 | (vc->vc_color & 0x0f);
1234 break;
1235 }
1236 update_attr(vc);
1237}
1238
1239static void respond_string(const char *p, struct tty_struct *tty)
1240{
1241 while (*p) {
1242 tty_insert_flip_char(tty, *p, 0);
1243 p++;
1244 }
1245 con_schedule_flip(tty);
1246}
1247
1248static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1249{
1250 char buf[40];
1251
1252 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1253 respond_string(buf, tty);
1254}
1255
1256static inline void status_report(struct tty_struct *tty)
1257{
1258 respond_string("\033[0n", tty); /* Terminal ok */
1259}
1260
1261static inline void respond_ID(struct tty_struct * tty)
1262{
1263 respond_string(VT102ID, tty);
1264}
1265
1266void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1267{
1268 char buf[8];
1269
1270 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1271 (char)('!' + mry));
1272 respond_string(buf, tty);
1273}
1274
1275/* invoked via ioctl(TIOCLINUX) and through set_selection */
1276int mouse_reporting(void)
1277{
1278 return vc_cons[fg_console].d->vc_report_mouse;
1279}
1280
1281/* console_sem is held */
1282static void set_mode(struct vc_data *vc, int on_off)
1283{
1284 int i;
1285
1286 for (i = 0; i <= vc->vc_npar; i++)
1287 if (vc->vc_ques) {
1288 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1289 case 1: /* Cursor keys send ^[Ox/^[[x */
1290 if (on_off)
1291 set_kbd(vc, decckm);
1292 else
1293 clr_kbd(vc, decckm);
1294 break;
1295 case 3: /* 80/132 mode switch unimplemented */
1296 vc->vc_deccolm = on_off;
1297#if 0
1298 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1299 /* this alone does not suffice; some user mode
1300 utility has to change the hardware regs */
1301#endif
1302 break;
1303 case 5: /* Inverted screen on/off */
1304 if (vc->vc_decscnm != on_off) {
1305 vc->vc_decscnm = on_off;
1306 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1307 update_attr(vc);
1308 }
1309 break;
1310 case 6: /* Origin relative/absolute */
1311 vc->vc_decom = on_off;
1312 gotoxay(vc, 0, 0);
1313 break;
1314 case 7: /* Autowrap on/off */
1315 vc->vc_decawm = on_off;
1316 break;
1317 case 8: /* Autorepeat on/off */
1318 if (on_off)
1319 set_kbd(vc, decarm);
1320 else
1321 clr_kbd(vc, decarm);
1322 break;
1323 case 9:
1324 vc->vc_report_mouse = on_off ? 1 : 0;
1325 break;
1326 case 25: /* Cursor on/off */
1327 vc->vc_deccm = on_off;
1328 break;
1329 case 1000:
1330 vc->vc_report_mouse = on_off ? 2 : 0;
1331 break;
1332 }
1333 } else {
1334 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1335 case 3: /* Monitor (display ctrls) */
1336 vc->vc_disp_ctrl = on_off;
1337 break;
1338 case 4: /* Insert Mode on/off */
1339 vc->vc_decim = on_off;
1340 break;
1341 case 20: /* Lf, Enter == CrLf/Lf */
1342 if (on_off)
1343 set_kbd(vc, lnm);
1344 else
1345 clr_kbd(vc, lnm);
1346 break;
1347 }
1348 }
1349}
1350
1351/* console_sem is held */
1352static void setterm_command(struct vc_data *vc)
1353{
1354 switch(vc->vc_par[0]) {
1355 case 1: /* set color for underline mode */
1356 if (vc->vc_can_do_color &&
1357 vc->vc_par[1] < 16) {
1358 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1359 if (vc->vc_underline)
1360 update_attr(vc);
1361 }
1362 break;
1363 case 2: /* set color for half intensity mode */
1364 if (vc->vc_can_do_color &&
1365 vc->vc_par[1] < 16) {
1366 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1367 if (vc->vc_intensity == 0)
1368 update_attr(vc);
1369 }
1370 break;
1371 case 8: /* store colors as defaults */
1372 vc->vc_def_color = vc->vc_attr;
1373 if (vc->vc_hi_font_mask == 0x100)
1374 vc->vc_def_color >>= 1;
1375 default_attr(vc);
1376 update_attr(vc);
1377 break;
1378 case 9: /* set blanking interval */
1379 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1380 poke_blanked_console();
1381 break;
1382 case 10: /* set bell frequency in Hz */
1383 if (vc->vc_npar >= 1)
1384 vc->vc_bell_pitch = vc->vc_par[1];
1385 else
1386 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1387 break;
1388 case 11: /* set bell duration in msec */
1389 if (vc->vc_npar >= 1)
1390 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1391 vc->vc_par[1] * HZ / 1000 : 0;
1392 else
1393 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1394 break;
1395 case 12: /* bring specified console to the front */
1396 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1397 set_console(vc->vc_par[1] - 1);
1398 break;
1399 case 13: /* unblank the screen */
1400 poke_blanked_console();
1401 break;
1402 case 14: /* set vesa powerdown interval */
1403 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1404 break;
1405 case 15: /* activate the previous console */
1406 set_console(last_console);
1407 break;
1408 }
1409}
1410
1411/* console_sem is held */
1412static void csi_at(struct vc_data *vc, unsigned int nr)
1413{
1414 if (nr > vc->vc_cols - vc->vc_x)
1415 nr = vc->vc_cols - vc->vc_x;
1416 else if (!nr)
1417 nr = 1;
1418 insert_char(vc, nr);
1419}
1420
1421/* console_sem is held */
1422static void csi_L(struct vc_data *vc, unsigned int nr)
1423{
1424 if (nr > vc->vc_rows - vc->vc_y)
1425 nr = vc->vc_rows - vc->vc_y;
1426 else if (!nr)
1427 nr = 1;
1428 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1429 vc->vc_need_wrap = 0;
1430}
1431
1432/* console_sem is held */
1433static void csi_P(struct vc_data *vc, unsigned int nr)
1434{
1435 if (nr > vc->vc_cols - vc->vc_x)
1436 nr = vc->vc_cols - vc->vc_x;
1437 else if (!nr)
1438 nr = 1;
1439 delete_char(vc, nr);
1440}
1441
1442/* console_sem is held */
1443static void csi_M(struct vc_data *vc, unsigned int nr)
1444{
1445 if (nr > vc->vc_rows - vc->vc_y)
1446 nr = vc->vc_rows - vc->vc_y;
1447 else if (!nr)
1448 nr=1;
1449 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1450 vc->vc_need_wrap = 0;
1451}
1452
1453/* console_sem is held (except via vc_init->reset_terminal */
1454static void save_cur(struct vc_data *vc)
1455{
1456 vc->vc_saved_x = vc->vc_x;
1457 vc->vc_saved_y = vc->vc_y;
1458 vc->vc_s_intensity = vc->vc_intensity;
1459 vc->vc_s_underline = vc->vc_underline;
1460 vc->vc_s_blink = vc->vc_blink;
1461 vc->vc_s_reverse = vc->vc_reverse;
1462 vc->vc_s_charset = vc->vc_charset;
1463 vc->vc_s_color = vc->vc_color;
1464 vc->vc_saved_G0 = vc->vc_G0_charset;
1465 vc->vc_saved_G1 = vc->vc_G1_charset;
1466}
1467
1468/* console_sem is held */
1469static void restore_cur(struct vc_data *vc)
1470{
1471 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1472 vc->vc_intensity = vc->vc_s_intensity;
1473 vc->vc_underline = vc->vc_s_underline;
1474 vc->vc_blink = vc->vc_s_blink;
1475 vc->vc_reverse = vc->vc_s_reverse;
1476 vc->vc_charset = vc->vc_s_charset;
1477 vc->vc_color = vc->vc_s_color;
1478 vc->vc_G0_charset = vc->vc_saved_G0;
1479 vc->vc_G1_charset = vc->vc_saved_G1;
1480 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1481 update_attr(vc);
1482 vc->vc_need_wrap = 0;
1483}
1484
1485enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1486 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1487 ESpalette };
1488
1489/* console_sem is held (except via vc_init()) */
1490static void reset_terminal(struct vc_data *vc, int do_clear)
1491{
1492 vc->vc_top = 0;
1493 vc->vc_bottom = vc->vc_rows;
1494 vc->vc_state = ESnormal;
1495 vc->vc_ques = 0;
1496 vc->vc_translate = set_translate(LAT1_MAP, vc);
1497 vc->vc_G0_charset = LAT1_MAP;
1498 vc->vc_G1_charset = GRAF_MAP;
1499 vc->vc_charset = 0;
1500 vc->vc_need_wrap = 0;
1501 vc->vc_report_mouse = 0;
1502 vc->vc_utf = 0;
1503 vc->vc_utf_count = 0;
1504
1505 vc->vc_disp_ctrl = 0;
1506 vc->vc_toggle_meta = 0;
1507
1508 vc->vc_decscnm = 0;
1509 vc->vc_decom = 0;
1510 vc->vc_decawm = 1;
1511 vc->vc_deccm = 1;
1512 vc->vc_decim = 0;
1513
1514 set_kbd(vc, decarm);
1515 clr_kbd(vc, decckm);
1516 clr_kbd(vc, kbdapplic);
1517 clr_kbd(vc, lnm);
1518 kbd_table[vc->vc_num].lockstate = 0;
1519 kbd_table[vc->vc_num].slockstate = 0;
1520 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1521 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1522 /* do not do set_leds here because this causes an endless tasklet loop
1523 when the keyboard hasn't been initialized yet */
1524
1525 vc->vc_cursor_type = CUR_DEFAULT;
1526 vc->vc_complement_mask = vc->vc_s_complement_mask;
1527
1528 default_attr(vc);
1529 update_attr(vc);
1530
1531 vc->vc_tab_stop[0] = 0x01010100;
1532 vc->vc_tab_stop[1] =
1533 vc->vc_tab_stop[2] =
1534 vc->vc_tab_stop[3] =
1535 vc->vc_tab_stop[4] = 0x01010101;
1536
1537 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1538 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1539
1540 gotoxy(vc, 0, 0);
1541 save_cur(vc);
1542 if (do_clear)
1543 csi_J(vc, 2);
1544}
1545
1546/* console_sem is held */
1547static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1548{
1549 /*
1550 * Control characters can be used in the _middle_
1551 * of an escape sequence.
1552 */
1553 switch (c) {
1554 case 0:
1555 return;
1556 case 7:
1557 if (vc->vc_bell_duration)
1558 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1559 return;
1560 case 8:
1561 bs(vc);
1562 return;
1563 case 9:
1564 vc->vc_pos -= (vc->vc_x << 1);
1565 while (vc->vc_x < vc->vc_cols - 1) {
1566 vc->vc_x++;
1567 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1568 break;
1569 }
1570 vc->vc_pos += (vc->vc_x << 1);
1571 return;
1572 case 10: case 11: case 12:
1573 lf(vc);
1574 if (!is_kbd(vc, lnm))
1575 return;
1576 case 13:
1577 cr(vc);
1578 return;
1579 case 14:
1580 vc->vc_charset = 1;
1581 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1582 vc->vc_disp_ctrl = 1;
1583 return;
1584 case 15:
1585 vc->vc_charset = 0;
1586 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1587 vc->vc_disp_ctrl = 0;
1588 return;
1589 case 24: case 26:
1590 vc->vc_state = ESnormal;
1591 return;
1592 case 27:
1593 vc->vc_state = ESesc;
1594 return;
1595 case 127:
1596 del(vc);
1597 return;
1598 case 128+27:
1599 vc->vc_state = ESsquare;
1600 return;
1601 }
1602 switch(vc->vc_state) {
1603 case ESesc:
1604 vc->vc_state = ESnormal;
1605 switch (c) {
1606 case '[':
1607 vc->vc_state = ESsquare;
1608 return;
1609 case ']':
1610 vc->vc_state = ESnonstd;
1611 return;
1612 case '%':
1613 vc->vc_state = ESpercent;
1614 return;
1615 case 'E':
1616 cr(vc);
1617 lf(vc);
1618 return;
1619 case 'M':
1620 ri(vc);
1621 return;
1622 case 'D':
1623 lf(vc);
1624 return;
1625 case 'H':
1626 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1627 return;
1628 case 'Z':
1629 respond_ID(tty);
1630 return;
1631 case '7':
1632 save_cur(vc);
1633 return;
1634 case '8':
1635 restore_cur(vc);
1636 return;
1637 case '(':
1638 vc->vc_state = ESsetG0;
1639 return;
1640 case ')':
1641 vc->vc_state = ESsetG1;
1642 return;
1643 case '#':
1644 vc->vc_state = EShash;
1645 return;
1646 case 'c':
1647 reset_terminal(vc, 1);
1648 return;
1649 case '>': /* Numeric keypad */
1650 clr_kbd(vc, kbdapplic);
1651 return;
1652 case '=': /* Appl. keypad */
1653 set_kbd(vc, kbdapplic);
1654 return;
1655 }
1656 return;
1657 case ESnonstd:
1658 if (c=='P') { /* palette escape sequence */
1659 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1660 vc->vc_par[vc->vc_npar] = 0;
1661 vc->vc_npar = 0;
1662 vc->vc_state = ESpalette;
1663 return;
1664 } else if (c=='R') { /* reset palette */
1665 reset_palette(vc);
1666 vc->vc_state = ESnormal;
1667 } else
1668 vc->vc_state = ESnormal;
1669 return;
1670 case ESpalette:
1671 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1672 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1673 if (vc->vc_npar == 7) {
1674 int i = vc->vc_par[0] * 3, j = 1;
1675 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1676 vc->vc_palette[i++] += vc->vc_par[j++];
1677 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678 vc->vc_palette[i++] += vc->vc_par[j++];
1679 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1680 vc->vc_palette[i] += vc->vc_par[j];
1681 set_palette(vc);
1682 vc->vc_state = ESnormal;
1683 }
1684 } else
1685 vc->vc_state = ESnormal;
1686 return;
1687 case ESsquare:
1688 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1689 vc->vc_par[vc->vc_npar] = 0;
1690 vc->vc_npar = 0;
1691 vc->vc_state = ESgetpars;
1692 if (c == '[') { /* Function key */
1693 vc->vc_state=ESfunckey;
1694 return;
1695 }
1696 vc->vc_ques = (c == '?');
1697 if (vc->vc_ques)
1698 return;
1699 case ESgetpars:
1700 if (c == ';' && vc->vc_npar < NPAR - 1) {
1701 vc->vc_npar++;
1702 return;
1703 } else if (c>='0' && c<='9') {
1704 vc->vc_par[vc->vc_npar] *= 10;
1705 vc->vc_par[vc->vc_npar] += c - '0';
1706 return;
1707 } else
1708 vc->vc_state = ESgotpars;
1709 case ESgotpars:
1710 vc->vc_state = ESnormal;
1711 switch(c) {
1712 case 'h':
1713 set_mode(vc, 1);
1714 return;
1715 case 'l':
1716 set_mode(vc, 0);
1717 return;
1718 case 'c':
1719 if (vc->vc_ques) {
1720 if (vc->vc_par[0])
1721 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1722 else
1723 vc->vc_cursor_type = CUR_DEFAULT;
1724 return;
1725 }
1726 break;
1727 case 'm':
1728 if (vc->vc_ques) {
1729 clear_selection();
1730 if (vc->vc_par[0])
1731 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1732 else
1733 vc->vc_complement_mask = vc->vc_s_complement_mask;
1734 return;
1735 }
1736 break;
1737 case 'n':
1738 if (!vc->vc_ques) {
1739 if (vc->vc_par[0] == 5)
1740 status_report(tty);
1741 else if (vc->vc_par[0] == 6)
1742 cursor_report(vc, tty);
1743 }
1744 return;
1745 }
1746 if (vc->vc_ques) {
1747 vc->vc_ques = 0;
1748 return;
1749 }
1750 switch(c) {
1751 case 'G': case '`':
1752 if (vc->vc_par[0])
1753 vc->vc_par[0]--;
1754 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1755 return;
1756 case 'A':
1757 if (!vc->vc_par[0])
1758 vc->vc_par[0]++;
1759 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1760 return;
1761 case 'B': case 'e':
1762 if (!vc->vc_par[0])
1763 vc->vc_par[0]++;
1764 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1765 return;
1766 case 'C': case 'a':
1767 if (!vc->vc_par[0])
1768 vc->vc_par[0]++;
1769 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1770 return;
1771 case 'D':
1772 if (!vc->vc_par[0])
1773 vc->vc_par[0]++;
1774 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1775 return;
1776 case 'E':
1777 if (!vc->vc_par[0])
1778 vc->vc_par[0]++;
1779 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1780 return;
1781 case 'F':
1782 if (!vc->vc_par[0])
1783 vc->vc_par[0]++;
1784 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1785 return;
1786 case 'd':
1787 if (vc->vc_par[0])
1788 vc->vc_par[0]--;
1789 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1790 return;
1791 case 'H': case 'f':
1792 if (vc->vc_par[0])
1793 vc->vc_par[0]--;
1794 if (vc->vc_par[1])
1795 vc->vc_par[1]--;
1796 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1797 return;
1798 case 'J':
1799 csi_J(vc, vc->vc_par[0]);
1800 return;
1801 case 'K':
1802 csi_K(vc, vc->vc_par[0]);
1803 return;
1804 case 'L':
1805 csi_L(vc, vc->vc_par[0]);
1806 return;
1807 case 'M':
1808 csi_M(vc, vc->vc_par[0]);
1809 return;
1810 case 'P':
1811 csi_P(vc, vc->vc_par[0]);
1812 return;
1813 case 'c':
1814 if (!vc->vc_par[0])
1815 respond_ID(tty);
1816 return;
1817 case 'g':
1818 if (!vc->vc_par[0])
1819 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1820 else if (vc->vc_par[0] == 3) {
1821 vc->vc_tab_stop[0] =
1822 vc->vc_tab_stop[1] =
1823 vc->vc_tab_stop[2] =
1824 vc->vc_tab_stop[3] =
1825 vc->vc_tab_stop[4] = 0;
1826 }
1827 return;
1828 case 'm':
1829 csi_m(vc);
1830 return;
1831 case 'q': /* DECLL - but only 3 leds */
1832 /* map 0,1,2,3 to 0,1,2,4 */
1833 if (vc->vc_par[0] < 4)
1834 setledstate(kbd_table + vc->vc_num,
1835 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1836 return;
1837 case 'r':
1838 if (!vc->vc_par[0])
1839 vc->vc_par[0]++;
1840 if (!vc->vc_par[1])
1841 vc->vc_par[1] = vc->vc_rows;
1842 /* Minimum allowed region is 2 lines */
1843 if (vc->vc_par[0] < vc->vc_par[1] &&
1844 vc->vc_par[1] <= vc->vc_rows) {
1845 vc->vc_top = vc->vc_par[0] - 1;
1846 vc->vc_bottom = vc->vc_par[1];
1847 gotoxay(vc, 0, 0);
1848 }
1849 return;
1850 case 's':
1851 save_cur(vc);
1852 return;
1853 case 'u':
1854 restore_cur(vc);
1855 return;
1856 case 'X':
1857 csi_X(vc, vc->vc_par[0]);
1858 return;
1859 case '@':
1860 csi_at(vc, vc->vc_par[0]);
1861 return;
1862 case ']': /* setterm functions */
1863 setterm_command(vc);
1864 return;
1865 }
1866 return;
1867 case ESpercent:
1868 vc->vc_state = ESnormal;
1869 switch (c) {
1870 case '@': /* defined in ISO 2022 */
1871 vc->vc_utf = 0;
1872 return;
1873 case 'G': /* prelim official escape code */
1874 case '8': /* retained for compatibility */
1875 vc->vc_utf = 1;
1876 return;
1877 }
1878 return;
1879 case ESfunckey:
1880 vc->vc_state = ESnormal;
1881 return;
1882 case EShash:
1883 vc->vc_state = ESnormal;
1884 if (c == '8') {
1885 /* DEC screen alignment test. kludge :-) */
1886 vc->vc_video_erase_char =
1887 (vc->vc_video_erase_char & 0xff00) | 'E';
1888 csi_J(vc, 2);
1889 vc->vc_video_erase_char =
1890 (vc->vc_video_erase_char & 0xff00) | ' ';
1891 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1892 }
1893 return;
1894 case ESsetG0:
1895 if (c == '0')
1896 vc->vc_G0_charset = GRAF_MAP;
1897 else if (c == 'B')
1898 vc->vc_G0_charset = LAT1_MAP;
1899 else if (c == 'U')
1900 vc->vc_G0_charset = IBMPC_MAP;
1901 else if (c == 'K')
1902 vc->vc_G0_charset = USER_MAP;
1903 if (vc->vc_charset == 0)
1904 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1905 vc->vc_state = ESnormal;
1906 return;
1907 case ESsetG1:
1908 if (c == '0')
1909 vc->vc_G1_charset = GRAF_MAP;
1910 else if (c == 'B')
1911 vc->vc_G1_charset = LAT1_MAP;
1912 else if (c == 'U')
1913 vc->vc_G1_charset = IBMPC_MAP;
1914 else if (c == 'K')
1915 vc->vc_G1_charset = USER_MAP;
1916 if (vc->vc_charset == 1)
1917 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1918 vc->vc_state = ESnormal;
1919 return;
1920 default:
1921 vc->vc_state = ESnormal;
1922 }
1923}
1924
1925/* This is a temporary buffer used to prepare a tty console write
1926 * so that we can easily avoid touching user space while holding the
1927 * console spinlock. It is allocated in con_init and is shared by
1928 * this code and the vc_screen read/write tty calls.
1929 *
1930 * We have to allocate this statically in the kernel data section
1931 * since console_init (and thus con_init) are called before any
1932 * kernel memory allocation is available.
1933 */
1934char con_buf[CON_BUF_SIZE];
1935DECLARE_MUTEX(con_buf_sem);
1936
1937/* acquires console_sem */
1938static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1939{
1940#ifdef VT_BUF_VRAM_ONLY
1941#define FLUSH do { } while(0);
1942#else
1943#define FLUSH if (draw_x >= 0) { \
1944 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1945 draw_x = -1; \
1946 }
1947#endif
1948
1949 int c, tc, ok, n = 0, draw_x = -1;
1950 unsigned int currcons;
1951 unsigned long draw_from = 0, draw_to = 0;
1952 struct vc_data *vc;
1953 u16 himask, charmask;
1954 const unsigned char *orig_buf = NULL;
1955 int orig_count;
1956
1957 if (in_interrupt())
1958 return count;
1959
1960 might_sleep();
1961
1962 acquire_console_sem();
1963 vc = tty->driver_data;
1964 if (vc == NULL) {
1965 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1966 release_console_sem();
1967 return 0;
1968 }
1969
1970 currcons = vc->vc_num;
1971 if (!vc_cons_allocated(currcons)) {
1972 /* could this happen? */
1973 static int error = 0;
1974 if (!error) {
1975 error = 1;
1976 printk("con_write: tty %d not allocated\n", currcons+1);
1977 }
1978 release_console_sem();
1979 return 0;
1980 }
1981 release_console_sem();
1982
1983 orig_buf = buf;
1984 orig_count = count;
1985
1986 /* At this point 'buf' is guaranteed to be a kernel buffer
1987 * and therefore no access to userspace (and therefore sleeping)
1988 * will be needed. The con_buf_sem serializes all tty based
1989 * console rendering and vcs write/read operations. We hold
1990 * the console spinlock during the entire write.
1991 */
1992
1993 acquire_console_sem();
1994
1995 vc = tty->driver_data;
1996 if (vc == NULL) {
1997 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1998 release_console_sem();
1999 goto out;
2000 }
2001
2002 himask = vc->vc_hi_font_mask;
2003 charmask = himask ? 0x1ff : 0xff;
2004
2005 /* undraw cursor first */
2006 if (IS_FG(vc))
2007 hide_cursor(vc);
2008
2009 while (!tty->stopped && count) {
2010 int orig = *buf;
2011 c = orig;
2012 buf++;
2013 n++;
2014 count--;
2015
2016 /* Do no translation at all in control states */
2017 if (vc->vc_state != ESnormal) {
2018 tc = c;
d4328b40 2019 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
1da177e4 2020 /* Combine UTF-8 into Unicode */
d4328b40
AT		 2021 /* Malformed sequences as sequences of replacement glyphs */
2022rescan_last_byte:
1da177e4 2023 if(c > 0x7f) {
d4328b40
AT		 2024 if (vc->vc_utf_count) {
2025 if ((c & 0xc0) == 0x80) {
2026 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2027 if (--vc->vc_utf_count) {
2028 vc->vc_npar++;
2029 continue;
2030 }
2031 tc = c = vc->vc_utf_char;
2032 } else
2033 goto replacement_glyph;
1da177e4 2034 } else {
d4328b40 2035 vc->vc_npar = 0;
1da177e4
LT		 2036 if ((c & 0xe0) == 0xc0) {
2037 vc->vc_utf_count = 1;
2038 vc->vc_utf_char = (c & 0x1f);
2039 } else if ((c & 0xf0) == 0xe0) {
2040 vc->vc_utf_count = 2;
2041 vc->vc_utf_char = (c & 0x0f);
2042 } else if ((c & 0xf8) == 0xf0) {
2043 vc->vc_utf_count = 3;
2044 vc->vc_utf_char = (c & 0x07);
2045 } else if ((c & 0xfc) == 0xf8) {
2046 vc->vc_utf_count = 4;
2047 vc->vc_utf_char = (c & 0x03);
2048 } else if ((c & 0xfe) == 0xfc) {
2049 vc->vc_utf_count = 5;
2050 vc->vc_utf_char = (c & 0x01);
2051 } else
d4328b40 2052 goto replacement_glyph;
1da177e4
LT		 2053 continue;
2054 }
2055 } else {
d4328b40
AT		 2056 if (vc->vc_utf_count)
2057 goto replacement_glyph;
1da177e4 2058 tc = c;
1da177e4 2059 }
d4328b40 2060 } else { /* no utf or alternate charset mode */
1da177e4
LT		 2061 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2062 }
2063
2064 /* If the original code was a control character we
2065 * only allow a glyph to be displayed if the code is
2066 * not normally used (such as for cursor movement) or
2067 * if the disp_ctrl mode has been explicitly enabled.
2068 * Certain characters (as given by the CTRL_ALWAYS
2069 * bitmap) are always displayed as control characters,
2070 * as the console would be pretty useless without
2071 * them; to display an arbitrary font position use the
2072 * direct-to-font zone in UTF-8 mode.
2073 */
2074 ok = tc && (c >= 32 ||
d4328b40
AT		 2075 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2076 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2077 && (c != 127 || vc->vc_disp_ctrl)
2078 && (c != 128+27);
2079
2080 if (vc->vc_state == ESnormal && ok) {
2081 /* Now try to find out how to display it */
2082 tc = conv_uni_to_pc(vc, tc);
d4328b40
AT		 2083 if (tc & ~charmask) {
2084 if ( tc == -4 ) {
1da177e4
LT		 2085 /* If we got -4 (not found) then see if we have
2086 defined a replacement character (U+FFFD) */
d4328b40
AT		 2087replacement_glyph:
2088 tc = conv_uni_to_pc(vc, 0xfffd);
2089 if (!(tc & ~charmask))
2090 goto display_glyph;
2091 } else if ( tc != -3 )
2092 continue; /* nothing to display */
2093 /* no hash table or no replacement --
2094 * hope for the best */
2095 if ( c & ~charmask )
2096 tc = '?';
2097 else
2098 tc = c;
2099 }
1da177e4 2100
d4328b40 2101display_glyph:
1da177e4
LT		 2102 if (vc->vc_need_wrap || vc->vc_decim)
2103 FLUSH
2104 if (vc->vc_need_wrap) {
2105 cr(vc);
2106 lf(vc);
2107 }
2108 if (vc->vc_decim)
2109 insert_char(vc, 1);
2110 scr_writew(himask ?
2111 ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2112 (vc->vc_attr << 8) + tc,
2113 (u16 *) vc->vc_pos);
2114 if (DO_UPDATE(vc) && draw_x < 0) {
2115 draw_x = vc->vc_x;
2116 draw_from = vc->vc_pos;
2117 }
2118 if (vc->vc_x == vc->vc_cols - 1) {
2119 vc->vc_need_wrap = vc->vc_decawm;
2120 draw_to = vc->vc_pos + 2;
2121 } else {
2122 vc->vc_x++;
2123 draw_to = (vc->vc_pos += 2);
2124 }
d4328b40
AT		 2125 if (vc->vc_utf_count) {
2126 if (vc->vc_npar) {
2127 vc->vc_npar--;
2128 goto display_glyph;
2129 }
2130 vc->vc_utf_count = 0;
2131 c = orig;
2132 goto rescan_last_byte;
2133 }
1da177e4
LT		 2134 continue;
2135 }
2136 FLUSH
2137 do_con_trol(tty, vc, orig);
2138 }
2139 FLUSH
2140 console_conditional_schedule();
2141 release_console_sem();
2142
2143out:
2144 return n;
2145#undef FLUSH
2146}
2147
2148/*
2149 * This is the console switching callback.
2150 *
2151 * Doing console switching in a process context allows
2152 * us to do the switches asynchronously (needed when we want
2153 * to switch due to a keyboard interrupt). Synchronization
2154 * with other console code and prevention of re-entrancy is
2155 * ensured with console_sem.
2156 */
2157static void console_callback(void *ignored)
2158{
2159 acquire_console_sem();
2160
2161 if (want_console >= 0) {
2162 if (want_console != fg_console &&
2163 vc_cons_allocated(want_console)) {
2164 hide_cursor(vc_cons[fg_console].d);
2165 change_console(vc_cons[want_console].d);
2166 /* we only changed when the console had already
2167 been allocated - a new console is not created
2168 in an interrupt routine */
2169 }
2170 want_console = -1;
2171 }
2172 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2173 do_poke_blanked_console = 0;
2174 poke_blanked_console();
2175 }
2176 if (scrollback_delta) {
2177 struct vc_data *vc = vc_cons[fg_console].d;
2178 clear_selection();
2179 if (vc->vc_mode == KD_TEXT)
2180 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2181 scrollback_delta = 0;
2182 }
2183 if (blank_timer_expired) {
2184 do_blank_screen(0);
2185 blank_timer_expired = 0;
2186 }
2187
2188 release_console_sem();
2189}
2190
2191void set_console(int nr)
2192{
2193 want_console = nr;
2194 schedule_console_callback();
2195}
2196
2197struct tty_driver *console_driver;
2198
2199#ifdef CONFIG_VT_CONSOLE
2200
2201/*
2202 * Console on virtual terminal
2203 *
2204 * The console must be locked when we get here.
2205 */
2206
2207static void vt_console_print(struct console *co, const char *b, unsigned count)
2208{
2209 struct vc_data *vc = vc_cons[fg_console].d;
2210 unsigned char c;
2211 static unsigned long printing;
2212 const ushort *start;
2213 ushort cnt = 0;
2214 ushort myx;
2215
2216 /* console busy or not yet initialized */
2217 if (!printable || test_and_set_bit(0, &printing))
2218 return;
2219
2220 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2221 vc = vc_cons[kmsg_redirect - 1].d;
2222
2223 /* read `x' only after setting currcons properly (otherwise
2224 the `x' macro will read the x of the foreground console). */
2225 myx = vc->vc_x;
2226
2227 if (!vc_cons_allocated(fg_console)) {
2228 /* impossible */
2229 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2230 goto quit;
2231 }
2232
2233 if (vc->vc_mode != KD_TEXT)
2234 goto quit;
2235
2236 /* undraw cursor first */
2237 if (IS_FG(vc))
2238 hide_cursor(vc);
2239
2240 start = (ushort *)vc->vc_pos;
2241
2242 /* Contrived structure to try to emulate original need_wrap behaviour
2243 * Problems caused when we have need_wrap set on '\n' character */
2244 while (count--) {
2245 c = *b++;
2246 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2247 if (cnt > 0) {
2248 if (CON_IS_VISIBLE(vc))
2249 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2250 vc->vc_x += cnt;
2251 if (vc->vc_need_wrap)
2252 vc->vc_x--;
2253 cnt = 0;
2254 }
2255 if (c == 8) { /* backspace */
2256 bs(vc);
2257 start = (ushort *)vc->vc_pos;
2258 myx = vc->vc_x;
2259 continue;
2260 }
2261 if (c != 13)
2262 lf(vc);
2263 cr(vc);
2264 start = (ushort *)vc->vc_pos;
2265 myx = vc->vc_x;
2266 if (c == 10 || c == 13)
2267 continue;
2268 }
2269 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2270 cnt++;
2271 if (myx == vc->vc_cols - 1) {
2272 vc->vc_need_wrap = 1;
2273 continue;
2274 }
2275 vc->vc_pos += 2;
2276 myx++;
2277 }
2278 if (cnt > 0) {
2279 if (CON_IS_VISIBLE(vc))
2280 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2281 vc->vc_x += cnt;
2282 if (vc->vc_x == vc->vc_cols) {
2283 vc->vc_x--;
2284 vc->vc_need_wrap = 1;
2285 }
2286 }
2287 set_cursor(vc);
2288
2289quit:
2290 clear_bit(0, &printing);
2291}
2292
2293static struct tty_driver *vt_console_device(struct console *c, int *index)
2294{
2295 *index = c->index ? c->index-1 : fg_console;
2296 return console_driver;
2297}
2298
2299static struct console vt_console_driver = {
2300 .name = "tty",
2301 .write = vt_console_print,
2302 .device = vt_console_device,
2303 .unblank = unblank_screen,
2304 .flags = CON_PRINTBUFFER,
2305 .index = -1,
2306};
2307#endif
2308
2309/*
2310 * Handling of Linux-specific VC ioctls
2311 */
2312
2313/*
2314 * Generally a bit racy with respect to console_sem().
2315 *
2316 * There are some functions which don't need it.
2317 *
2318 * There are some functions which can sleep for arbitrary periods
2319 * (paste_selection) but we don't need the lock there anyway.
2320 *
2321 * set_selection has locking, and definitely needs it
2322 */
2323
2324int tioclinux(struct tty_struct *tty, unsigned long arg)
2325{
2326 char type, data;
2327 char __user *p = (char __user *)arg;
2328 int lines;
2329 int ret;
2330
2331 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2332 return -EINVAL;
2333 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2334 return -EPERM;
2335 if (get_user(type, p))
2336 return -EFAULT;
2337 ret = 0;
2338 switch (type)
2339 {
2340 case TIOCL_SETSEL:
2341 acquire_console_sem();
2342 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2343 release_console_sem();
2344 break;
2345 case TIOCL_PASTESEL:
2346 ret = paste_selection(tty);
2347 break;
2348 case TIOCL_UNBLANKSCREEN:
2d237c63 2349 acquire_console_sem();
1da177e4 2350 unblank_screen();
2d237c63 2351 release_console_sem();
1da177e4
LT		 2352 break;
2353 case TIOCL_SELLOADLUT:
2354 ret = sel_loadlut(p);
2355 break;
2356 case TIOCL_GETSHIFTSTATE:
2357
2358 /*
2359 * Make it possible to react to Shift+Mousebutton.
2360 * Note that 'shift_state' is an undocumented
2361 * kernel-internal variable; programs not closely
2362 * related to the kernel should not use this.
2363 */
2364 data = shift_state;
2365 ret = __put_user(data, p);
2366 break;
2367 case TIOCL_GETMOUSEREPORTING:
2368 data = mouse_reporting();
2369 ret = __put_user(data, p);
2370 break;
2371 case TIOCL_SETVESABLANK:
2372 set_vesa_blanking(p);
2373 break;
0ca07731
RW		 2374 case TIOCL_GETKMSGREDIRECT:
2375 data = kmsg_redirect;
2376 ret = __put_user(data, p);
2377 break;
1da177e4
LT		 2378 case TIOCL_SETKMSGREDIRECT:
2379 if (!capable(CAP_SYS_ADMIN)) {
2380 ret = -EPERM;
2381 } else {
2382 if (get_user(data, p+1))
2383 ret = -EFAULT;
2384 else
2385 kmsg_redirect = data;
2386 }
2387 break;
2388 case TIOCL_GETFGCONSOLE:
2389 ret = fg_console;
2390 break;
2391 case TIOCL_SCROLLCONSOLE:
2392 if (get_user(lines, (s32 __user *)(p+4))) {
2393 ret = -EFAULT;
2394 } else {
2395 scrollfront(vc_cons[fg_console].d, lines);
2396 ret = 0;
2397 }
2398 break;
2399 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2400 acquire_console_sem();
1da177e4
LT		 2401 ignore_poke = 1;
2402 do_blank_screen(0);
2d237c63 2403 release_console_sem();
1da177e4
LT		 2404 break;
2405 case TIOCL_BLANKEDSCREEN:
2406 ret = console_blanked;
2407 break;
2408 default:
2409 ret = -EINVAL;
2410 break;
2411 }
2412 return ret;
2413}
2414
2415/*
2416 * /dev/ttyN handling
2417 */
2418
2419static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2420{
2421 int retval;
2422
2423 retval = do_con_write(tty, buf, count);
2424 con_flush_chars(tty);
2425
2426 return retval;
2427}
2428
2429static void con_put_char(struct tty_struct *tty, unsigned char ch)
2430{
2431 if (in_interrupt())
2432 return; /* n_r3964 calls put_char() from interrupt context */
2433 do_con_write(tty, &ch, 1);
2434}
2435
2436static int con_write_room(struct tty_struct *tty)
2437{
2438 if (tty->stopped)
2439 return 0;
2440 return 4096; /* No limit, really; we're not buffering */
2441}
2442
2443static int con_chars_in_buffer(struct tty_struct *tty)
2444{
2445 return 0; /* we're not buffering */
2446}
2447
2448/*
2449 * con_throttle and con_unthrottle are only used for
2450 * paste_selection(), which has to stuff in a large number of
2451 * characters...
2452 */
2453static void con_throttle(struct tty_struct *tty)
2454{
2455}
2456
2457static void con_unthrottle(struct tty_struct *tty)
2458{
2459 struct vc_data *vc = tty->driver_data;
2460
2461 wake_up_interruptible(&vc->paste_wait);
2462}
2463
2464/*
2465 * Turn the Scroll-Lock LED on when the tty is stopped
2466 */
2467static void con_stop(struct tty_struct *tty)
2468{
2469 int console_num;
2470 if (!tty)
2471 return;
2472 console_num = tty->index;
2473 if (!vc_cons_allocated(console_num))
2474 return;
2475 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2476 set_leds();
2477}
2478
2479/*
2480 * Turn the Scroll-Lock LED off when the console is started
2481 */
2482static void con_start(struct tty_struct *tty)
2483{
2484 int console_num;
2485 if (!tty)
2486 return;
2487 console_num = tty->index;
2488 if (!vc_cons_allocated(console_num))
2489 return;
2490 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2491 set_leds();
2492}
2493
2494static void con_flush_chars(struct tty_struct *tty)
2495{
2496 struct vc_data *vc;
2497
2498 if (in_interrupt()) /* from flush_to_ldisc */
2499 return;
2500
2501 /* if we race with con_close(), vt may be null */
2502 acquire_console_sem();
2503 vc = tty->driver_data;
2504 if (vc)
2505 set_cursor(vc);
2506 release_console_sem();
2507}
2508
2509/*
2510 * Allocate the console screen memory.
2511 */
2512static int con_open(struct tty_struct *tty, struct file *filp)
2513{
2514 unsigned int currcons = tty->index;
2515 int ret = 0;
2516
2517 acquire_console_sem();
f786648b 2518 if (tty->driver_data == NULL) {
1da177e4
LT		 2519 ret = vc_allocate(currcons);
2520 if (ret == 0) {
2521 struct vc_data *vc = vc_cons[currcons].d;
2522 tty->driver_data = vc;
2523 vc->vc_tty = tty;
2524
2525 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2526 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2527 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2528 }
2529 release_console_sem();
d09d7ddf 2530 vcs_make_sysfs(tty);
1da177e4
LT		 2531 return ret;
2532 }
2533 }
2534 release_console_sem();
2535 return ret;
2536}
2537
2538/*
70522e12 2539 * We take tty_mutex in here to prevent another thread from coming in via init_dev
1da177e4
LT		 2540 * and taking a ref against the tty while we're in the process of forgetting
2541 * about it and cleaning things up.
2542 *
d09d7ddf 2543 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
1da177e4
LT		 2544 */
2545static void con_close(struct tty_struct *tty, struct file *filp)
2546{
70522e12 2547 mutex_lock(&tty_mutex);
1da177e4
LT		 2548 acquire_console_sem();
2549 if (tty && tty->count == 1) {
2550 struct vc_data *vc = tty->driver_data;
2551
2552 if (vc)
2553 vc->vc_tty = NULL;
2554 tty->driver_data = NULL;
2555 release_console_sem();
d09d7ddf 2556 vcs_remove_sysfs(tty);
70522e12 2557 mutex_unlock(&tty_mutex);
1da177e4 2558 /*
70522e12 2559 * tty_mutex is released, but we still hold BKL, so there is
1da177e4
LT		 2560 * still exclusion against init_dev()
2561 */
2562 return;
2563 }
2564 release_console_sem();
70522e12 2565 mutex_unlock(&tty_mutex);
1da177e4
LT		 2566}
2567
2568static void vc_init(struct vc_data *vc, unsigned int rows,
2569 unsigned int cols, int do_clear)
2570{
2571 int j, k ;
2572
2573 vc->vc_cols = cols;
2574 vc->vc_rows = rows;
2575 vc->vc_size_row = cols << 1;
2576 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2577
2578 set_origin(vc);
2579 vc->vc_pos = vc->vc_origin;
2580 reset_vc(vc);
2581 for (j=k=0; j<16; j++) {
2582 vc->vc_palette[k++] = default_red[j] ;
2583 vc->vc_palette[k++] = default_grn[j] ;
2584 vc->vc_palette[k++] = default_blu[j] ;
2585 }
2586 vc->vc_def_color = 0x07; /* white */
2587 vc->vc_ulcolor = 0x0f; /* bold white */
2588 vc->vc_halfcolor = 0x08; /* grey */
2589 init_waitqueue_head(&vc->paste_wait);
2590 reset_terminal(vc, do_clear);
2591}
2592
2593/*
2594 * This routine initializes console interrupts, and does nothing
2595 * else. If you want the screen to clear, call tty_write with
2596 * the appropriate escape-sequence.
2597 */
2598
2599static int __init con_init(void)
2600{
2601 const char *display_desc = NULL;
2602 struct vc_data *vc;
3e795de7 2603 unsigned int currcons = 0, i;
1da177e4
LT		 2604
2605 acquire_console_sem();
2606
2607 if (conswitchp)
2608 display_desc = conswitchp->con_startup();
2609 if (!display_desc) {
2610 fg_console = 0;
2611 release_console_sem();
2612 return 0;
2613 }
2614
3e795de7
AD		 2615 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2616 struct con_driver *con_driver = &registered_con_driver[i];
2617
2618 if (con_driver->con == NULL) {
2619 con_driver->con = conswitchp;
2620 con_driver->desc = display_desc;
2621 con_driver->flag = CON_DRIVER_FLAG_INIT;
2622 con_driver->first = 0;
2623 con_driver->last = MAX_NR_CONSOLES - 1;
2624 break;
2625 }
2626 }
2627
2628 for (i = 0; i < MAX_NR_CONSOLES; i++)
2629 con_driver_map[i] = conswitchp;
2630
1da177e4
LT		 2631 init_timer(&console_timer);
2632 console_timer.function = blank_screen_t;
2633 if (blankinterval) {
2634 blank_state = blank_normal_wait;
2635 mod_timer(&console_timer, jiffies + blankinterval);
2636 }
2637
2638 /*
2639 * kmalloc is not running yet - we use the bootmem allocator.
2640 */
2641 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2642 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2643 visual_init(vc, currcons, 1);
2644 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2645 vc->vc_kmalloced = 0;
2646 vc_init(vc, vc->vc_rows, vc->vc_cols,
2647 currcons || !vc->vc_sw->con_save_screen);
2648 }
2649 currcons = fg_console = 0;
2650 master_display_fg = vc = vc_cons[currcons].d;
2651 set_origin(vc);
2652 save_screen(vc);
2653 gotoxy(vc, vc->vc_x, vc->vc_y);
2654 csi_J(vc, 0);
2655 update_screen(vc);
2656 printk("Console: %s %s %dx%d",
2657 vc->vc_can_do_color ? "colour" : "mono",
2658 display_desc, vc->vc_cols, vc->vc_rows);
2659 printable = 1;
2660 printk("\n");
2661
2662 release_console_sem();
2663
2664#ifdef CONFIG_VT_CONSOLE
2665 register_console(&vt_console_driver);
2666#endif
2667 return 0;
2668}
2669console_initcall(con_init);
2670
b68e31d0 2671static const struct tty_operations con_ops = {
1da177e4
LT		 2672 .open = con_open,
2673 .close = con_close,
2674 .write = con_write,
2675 .write_room = con_write_room,
2676 .put_char = con_put_char,
2677 .flush_chars = con_flush_chars,
2678 .chars_in_buffer = con_chars_in_buffer,
2679 .ioctl = vt_ioctl,
2680 .stop = con_stop,
2681 .start = con_start,
2682 .throttle = con_throttle,
2683 .unthrottle = con_unthrottle,
2684};
2685
2686int __init vty_init(void)
2687{
2688 vcs_init();
2689
2690 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2691 if (!console_driver)
2692 panic("Couldn't allocate console driver\n");
2693 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2694 console_driver->name = "tty";
2695 console_driver->name_base = 1;
2696 console_driver->major = TTY_MAJOR;
2697 console_driver->minor_start = 1;
2698 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2699 console_driver->init_termios = tty_std_termios;
2700 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2701 tty_set_operations(console_driver, &con_ops);
2702 if (tty_register_driver(console_driver))
2703 panic("Couldn't register console driver\n");
2704
2705 kbd_init();
2706 console_map_init();
2707#ifdef CONFIG_PROM_CONSOLE
2708 prom_con_init();
2709#endif
2710#ifdef CONFIG_MDA_CONSOLE
2711 mda_console_init();
2712#endif
2713 return 0;
2714}
2715
2716#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 2717#include <linux/device.h>
2718
2719static struct class *vtconsole_class;
2720
3e795de7
AD		 2721static int bind_con_driver(const struct consw *csw, int first, int last,
2722 int deflt)
1da177e4 2723{
3e795de7
AD		 2724 struct module *owner = csw->owner;
2725 const char *desc = NULL;
2726 struct con_driver *con_driver;
2727 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2728
1da177e4
LT		 2729 if (!try_module_get(owner))
2730 return -ENODEV;
2731
1c8ce271 2732 acquire_console_sem();
1c8ce271 2733
3e795de7
AD		 2734 /* check if driver is registered */
2735 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2736 con_driver = &registered_con_driver[i];
2737
2738 if (con_driver->con == csw) {
2739 desc = con_driver->desc;
2740 retval = 0;
2741 break;
2742 }
2743 }
2744
2745 if (retval)
2746 goto err;
2747
2748 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2749 csw->con_startup();
2750 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 2751 }
1c8ce271 2752
1da177e4
LT		 2753 if (deflt) {
2754 if (conswitchp)
2755 module_put(conswitchp->owner);
1c8ce271 2756
1da177e4
LT		 2757 __module_get(owner);
2758 conswitchp = csw;
2759 }
2760
3e795de7
AD		 2761 first = max(first, con_driver->first);
2762 last = min(last, con_driver->last);
2763
1da177e4
LT		 2764 for (i = first; i <= last; i++) {
2765 int old_was_color;
2766 struct vc_data *vc = vc_cons[i].d;
2767
2768 if (con_driver_map[i])
2769 module_put(con_driver_map[i]->owner);
2770 __module_get(owner);
2771 con_driver_map[i] = csw;
2772
2773 if (!vc || !vc->vc_sw)
2774 continue;
2775
2776 j = i;
1c8ce271 2777
4ee1acce
DH		 2778 if (CON_IS_VISIBLE(vc)) {
2779 k = i;
1da177e4 2780 save_screen(vc);
4ee1acce
DH		 2781 }
2782
1da177e4
LT		 2783 old_was_color = vc->vc_can_do_color;
2784 vc->vc_sw->con_deinit(vc);
2785 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 2786 visual_init(vc, i, 0);
1c8ce271 2787 set_origin(vc);
1da177e4
LT		 2788 update_attr(vc);
2789
2790 /* If the console changed between mono <-> color, then
2791 * the attributes in the screenbuf will be wrong. The
2792 * following resets all attributes to something sane.
2793 */
2794 if (old_was_color != vc->vc_can_do_color)
2795 clear_buffer_attributes(vc);
1da177e4 2796 }
4ee1acce 2797
1da177e4
LT		 2798 printk("Console: switching ");
2799 if (!deflt)
2800 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 2801 if (j >= 0) {
2802 struct vc_data *vc = vc_cons[j].d;
2803
1da177e4 2804 printk("to %s %s %dx%d\n",
4ee1acce
DH		 2805 vc->vc_can_do_color ? "colour" : "mono",
2806 desc, vc->vc_cols, vc->vc_rows);
2807
2808 if (k >= 0) {
2809 vc = vc_cons[k].d;
2810 update_screen(vc);
2811 }
2812 } else
1da177e4
LT		 2813 printk("to %s\n", desc);
2814
3e795de7
AD		 2815 retval = 0;
2816err:
1da177e4 2817 release_console_sem();
1da177e4 2818 module_put(owner);
3e795de7
AD		 2819 return retval;
2820};
1da177e4 2821
13ae6645
AD		 2822#ifdef CONFIG_VT_HW_CONSOLE_BINDING
2823static int con_is_graphics(const struct consw *csw, int first, int last)
2824{
2825 int i, retval = 0;
2826
2827 for (i = first; i <= last; i++) {
2828 struct vc_data *vc = vc_cons[i].d;
2829
2830 if (vc && vc->vc_mode == KD_GRAPHICS) {
2831 retval = 1;
2832 break;
2833 }
2834 }
2835
2836 return retval;
2837}
2838
3e795de7
AD		 2839static int unbind_con_driver(const struct consw *csw, int first, int last,
2840 int deflt)
1da177e4 2841{
3e795de7
AD		 2842 struct module *owner = csw->owner;
2843 const struct consw *defcsw = NULL;
2844 struct con_driver *con_driver = NULL, *con_back = NULL;
2845 int i, retval = -ENODEV;
1da177e4 2846
3e795de7
AD		 2847 if (!try_module_get(owner))
2848 return -ENODEV;
2849
2850 acquire_console_sem();
2851
2852 /* check if driver is registered and if it is unbindable */
2853 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2854 con_driver = &registered_con_driver[i];
2855
2856 if (con_driver->con == csw &&
6db4063c 2857 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 2858 retval = 0;
2859 break;
2860 }
2861 }
2862
2863 if (retval) {
2864 release_console_sem();
2865 goto err;
2866 }
2867
6db4063c
AD		 2868 retval = -ENODEV;
2869
3e795de7
AD		 2870 /* check if backup driver exists */
2871 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2872 con_back = &registered_con_driver[i];
2873
2874 if (con_back->con &&
6db4063c 2875 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 2876 defcsw = con_back->con;
2877 retval = 0;
2878 break;
2879 }
2880 }
2881
2882 if (retval) {
2883 release_console_sem();
2884 goto err;
2885 }
2886
2887 if (!con_is_bound(csw)) {
2888 release_console_sem();
2889 goto err;
2890 }
2891
2892 first = max(first, con_driver->first);
2893 last = min(last, con_driver->last);
2894
2895 for (i = first; i <= last; i++) {
1da177e4
LT		 2896 if (con_driver_map[i] == csw) {
2897 module_put(csw->owner);
2898 con_driver_map[i] = NULL;
2899 }
3e795de7
AD		 2900 }
2901
2902 if (!con_is_bound(defcsw)) {
6db4063c
AD		 2903 const struct consw *defconsw = conswitchp;
2904
3e795de7
AD		 2905 defcsw->con_startup();
2906 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 2907 /*
2908 * vgacon may change the default driver to point
2909 * to dummycon, we restore it here...
2910 */
2911 conswitchp = defconsw;
3e795de7
AD		 2912 }
2913
2914 if (!con_is_bound(csw))
2915 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2916
2917 release_console_sem();
6db4063c
AD		 2918 /* ignore return value, binding should not fail */
2919 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 2920err:
2921 module_put(owner);
2922 return retval;
2923
2924}
2925
6db4063c
AD		 2926static int vt_bind(struct con_driver *con)
2927{
2928 const struct consw *defcsw = NULL, *csw = NULL;
2929 int i, more = 1, first = -1, last = -1, deflt = 0;
2930
2931 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2932 con_is_graphics(con->con, con->first, con->last))
2933 goto err;
2934
2935 csw = con->con;
2936
2937 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2938 struct con_driver *con = &registered_con_driver[i];
2939
2940 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2941 defcsw = con->con;
2942 break;
2943 }
2944 }
2945
2946 if (!defcsw)
2947 goto err;
2948
2949 while (more) {
2950 more = 0;
2951
2952 for (i = con->first; i <= con->last; i++) {
2953 if (con_driver_map[i] == defcsw) {
2954 if (first == -1)
2955 first = i;
2956 last = i;
2957 more = 1;
2958 } else if (first != -1)
2959 break;
2960 }
2961
2962 if (first == 0 && last == MAX_NR_CONSOLES -1)
2963 deflt = 1;
2964
2965 if (first != -1)
2966 bind_con_driver(csw, first, last, deflt);
2967
2968 first = -1;
2969 last = -1;
2970 deflt = 0;
2971 }
2972
2973err:
2974 return 0;
2975}
2976
2977static int vt_unbind(struct con_driver *con)
2978{
2979 const struct consw *csw = NULL;
2980 int i, more = 1, first = -1, last = -1, deflt = 0;
2981
2982 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2983 con_is_graphics(con->con, con->first, con->last))
2984 goto err;
2985
2986 csw = con->con;
2987
2988 while (more) {
2989 more = 0;
2990
2991 for (i = con->first; i <= con->last; i++) {
2992 if (con_driver_map[i] == csw) {
2993 if (first == -1)
2994 first = i;
2995 last = i;
2996 more = 1;
2997 } else if (first != -1)
2998 break;
2999 }
3000
3001 if (first == 0 && last == MAX_NR_CONSOLES -1)
3002 deflt = 1;
3003
3004 if (first != -1)
3005 unbind_con_driver(csw, first, last, deflt);
3006
3007 first = -1;
3008 last = -1;
3009 deflt = 0;
3010 }
3011
3012err:
3013 return 0;
3014}
13ae6645
AD		 3015#else
3016static inline int vt_bind(struct con_driver *con)
3017{
3018 return 0;
3019}
3020static inline int vt_unbind(struct con_driver *con)
3021{
3022 return 0;
3023}
3024#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c
AD		 3025
3026static ssize_t store_bind(struct class_device *class_device,
3027 const char *buf, size_t count)
3028{
3029 struct con_driver *con = class_get_devdata(class_device);
3030 int bind = simple_strtoul(buf, NULL, 0);
3031
3032 if (bind)
3033 vt_bind(con);
3034 else
3035 vt_unbind(con);
3036
3037 return count;
3038}
3039
3040static ssize_t show_bind(struct class_device *class_device, char *buf)
3041{
3042 struct con_driver *con = class_get_devdata(class_device);
3043 int bind = con_is_bound(con->con);
3044
3045 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3046}
3047
3048static ssize_t show_name(struct class_device *class_device, char *buf)
3049{
3050 struct con_driver *con = class_get_devdata(class_device);
3051
3052 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3053 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3054 con->desc);
3055
3056}
3057
3058static struct class_device_attribute class_device_attrs[] = {
3059 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3060 __ATTR(name, S_IRUGO, show_name, NULL),
3061};
3062
3063static int vtconsole_init_class_device(struct con_driver *con)
3064{
3065 int i;
928e964f 3066 int error = 0;
6db4063c 3067
928e964f 3068 con->flag |= CON_DRIVER_FLAG_ATTR;
6db4063c 3069 class_set_devdata(con->class_dev, con);
928e964f
AD		 3070 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) {
3071 error = class_device_create_file(con->class_dev,
6db4063c 3072 &class_device_attrs[i]);
928e964f
AD		 3073 if (error)
3074 break;
3075 }
6db4063c 3076
928e964f
AD		 3077 if (error) {
3078 while (--i >= 0)
3079 class_device_remove_file(con->class_dev,
3080 &class_device_attrs[i]);
3081 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3082 }
3083
3084 return error;
6db4063c
AD		 3085}
3086
3087static void vtconsole_deinit_class_device(struct con_driver *con)
3088{
3089 int i;
3090
928e964f
AD		 3091 if (con->flag & CON_DRIVER_FLAG_ATTR) {
3092 for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
3093 class_device_remove_file(con->class_dev,
3094 &class_device_attrs[i]);
3095 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3096 }
6db4063c
AD		 3097}
3098
3e795de7
AD		 3099/**
3100 * con_is_bound - checks if driver is bound to the console
3101 * @csw: console driver
3102 *
3103 * RETURNS: zero if unbound, nonzero if bound
3104 *
3105 * Drivers can call this and if zero, they should release
3106 * all resources allocated on con_startup()
3107 */
3108int con_is_bound(const struct consw *csw)
3109{
3110 int i, bound = 0;
3111
3112 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3113 if (con_driver_map[i] == csw) {
3114 bound = 1;
3115 break;
3116 }
3117 }
3118
3119 return bound;
3120}
3121EXPORT_SYMBOL(con_is_bound);
3122
3123/**
3124 * register_con_driver - register console driver to console layer
3125 * @csw: console driver
3126 * @first: the first console to take over, minimum value is 0
3127 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3128 *
3129 * DESCRIPTION: This function registers a console driver which can later
3130 * bind to a range of consoles specified by @first and @last. It will
3131 * also initialize the console driver by calling con_startup().
3132 */
3133int register_con_driver(const struct consw *csw, int first, int last)
3134{
3135 struct module *owner = csw->owner;
3136 struct con_driver *con_driver;
3137 const char *desc;
3138 int i, retval = 0;
3139
3140 if (!try_module_get(owner))
3141 return -ENODEV;
3142
3143 acquire_console_sem();
3144
3145 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3146 con_driver = &registered_con_driver[i];
3147
3148 /* already registered */
3149 if (con_driver->con == csw)
3150 retval = -EINVAL;
3151 }
3152
3153 if (retval)
3154 goto err;
3155
3156 desc = csw->con_startup();
3157
3158 if (!desc)
3159 goto err;
3160
3161 retval = -EINVAL;
3162
3163 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3164 con_driver = &registered_con_driver[i];
3165
3166 if (con_driver->con == NULL) {
3167 con_driver->con = csw;
3168 con_driver->desc = desc;
6db4063c
AD		 3169 con_driver->node = i;
3170 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3171 CON_DRIVER_FLAG_INIT;
3172 con_driver->first = first;
3173 con_driver->last = last;
3174 retval = 0;
3175 break;
3176 }
3177 }
3178
6db4063c
AD		 3179 if (retval)
3180 goto err;
3181
3182 con_driver->class_dev = class_device_create(vtconsole_class, NULL,
3183 MKDEV(0, con_driver->node),
3184 NULL, "vtcon%i",
3185 con_driver->node);
3186
3187 if (IS_ERR(con_driver->class_dev)) {
3188 printk(KERN_WARNING "Unable to create class_device for %s; "
3189 "errno = %ld\n", con_driver->desc,
3190 PTR_ERR(con_driver->class_dev));
3191 con_driver->class_dev = NULL;
3192 } else {
3193 vtconsole_init_class_device(con_driver);
3194 }
928e964f 3195
3e795de7
AD		 3196err:
3197 release_console_sem();
3198 module_put(owner);
3199 return retval;
3200}
3201EXPORT_SYMBOL(register_con_driver);
3202
3203/**
3204 * unregister_con_driver - unregister console driver from console layer
3205 * @csw: console driver
3206 *
3207 * DESCRIPTION: All drivers that registers to the console layer must
3208 * call this function upon exit, or if the console driver is in a state
3209 * where it won't be able to handle console services, such as the
3210 * framebuffer console without loaded framebuffer drivers.
3211 *
3212 * The driver must unbind first prior to unregistration.
3213 */
3214int unregister_con_driver(const struct consw *csw)
3215{
3216 int i, retval = -ENODEV;
3217
3218 acquire_console_sem();
3219
3220 /* cannot unregister a bound driver */
3221 if (con_is_bound(csw))
3222 goto err;
3223
3224 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3225 struct con_driver *con_driver = &registered_con_driver[i];
3226
3227 if (con_driver->con == csw &&
6db4063c
AD		 3228 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3229 vtconsole_deinit_class_device(con_driver);
3230 class_device_destroy(vtconsole_class,
3231 MKDEV(0, con_driver->node));
3e795de7
AD		 3232 con_driver->con = NULL;
3233 con_driver->desc = NULL;
6db4063c
AD		 3234 con_driver->class_dev = NULL;
3235 con_driver->node = 0;
3e795de7
AD		 3236 con_driver->flag = 0;
3237 con_driver->first = 0;
3238 con_driver->last = 0;
3239 retval = 0;
3240 break;
3241 }
3242 }
3e795de7
AD		 3243err:
3244 release_console_sem();
3245 return retval;
3246}
3247EXPORT_SYMBOL(unregister_con_driver);
3248
3249/*
3250 * If we support more console drivers, this function is used
3251 * when a driver wants to take over some existing consoles
3252 * and become default driver for newly opened ones.
3253 *
3254 * take_over_console is basically a register followed by unbind
3255 */
3256int take_over_console(const struct consw *csw, int first, int last, int deflt)
3257{
3258 int err;
3259
3260 err = register_con_driver(csw, first, last);
3261
3262 if (!err)
6db4063c 3263 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3264
3265 return err;
3266}
3267
3268/*
3269 * give_up_console is a wrapper to unregister_con_driver. It will only
3270 * work if driver is fully unbound.
3271 */
3272void give_up_console(const struct consw *csw)
3273{
3274 unregister_con_driver(csw);
3275}
3276
6db4063c 3277static int __init vtconsole_class_init(void)
3e795de7 3278{
6db4063c 3279 int i;
3e795de7 3280
6db4063c
AD		 3281 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3282 if (IS_ERR(vtconsole_class)) {
3283 printk(KERN_WARNING "Unable to create vt console class; "
3284 "errno = %ld\n", PTR_ERR(vtconsole_class));
3285 vtconsole_class = NULL;
3286 }
3e795de7 3287
6db4063c 3288 /* Add system drivers to sysfs */
3e795de7
AD		 3289 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3290 struct con_driver *con = &registered_con_driver[i];
3291
6db4063c
AD		 3292 if (con->con && !con->class_dev) {
3293 con->class_dev =
3294 class_device_create(vtconsole_class, NULL,
3295 MKDEV(0, con->node), NULL,
3296 "vtcon%i", con->node);
3297
3298 if (IS_ERR(con->class_dev)) {
3299 printk(KERN_WARNING "Unable to create "
3300 "class_device for %s; errno = %ld\n",
3301 con->desc, PTR_ERR(con->class_dev));
3302 con->class_dev = NULL;
3303 } else {
3304 vtconsole_init_class_device(con);
3305 }
3e795de7 3306 }
3e795de7
AD		 3307 }
3308
3e795de7
AD		 3309 return 0;
3310}
6db4063c 3311postcore_initcall(vtconsole_class_init);
3e795de7 3312
1da177e4
LT		 3313#endif
3314
3315/*
3316 * Screen blanking
3317 */
3318
3319static void set_vesa_blanking(char __user *p)
3320{
3321 unsigned int mode;
3322 get_user(mode, p + 1);
3323 vesa_blank_mode = (mode < 4) ? mode : 0;
3324}
3325
1da177e4
LT		 3326void do_blank_screen(int entering_gfx)
3327{
3328 struct vc_data *vc = vc_cons[fg_console].d;
3329 int i;
3330
3331 WARN_CONSOLE_UNLOCKED();
3332
3333 if (console_blanked) {
3334 if (blank_state == blank_vesa_wait) {
3335 blank_state = blank_off;
d060a321 3336 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3337 }
3338 return;
3339 }
3340 if (blank_state != blank_normal_wait)
3341 return;
3342 blank_state = blank_off;
3343
3344 /* entering graphics mode? */
3345 if (entering_gfx) {
3346 hide_cursor(vc);
3347 save_screen(vc);
3348 vc->vc_sw->con_blank(vc, -1, 1);
3349 console_blanked = fg_console + 1;
3350 set_origin(vc);
3351 return;
3352 }
3353
3354 /* don't blank graphics */
3355 if (vc->vc_mode != KD_TEXT) {
3356 console_blanked = fg_console + 1;
3357 return;
3358 }
3359
3360 hide_cursor(vc);
3361 del_timer_sync(&console_timer);
3362 blank_timer_expired = 0;
3363
3364 save_screen(vc);
3365 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3366 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3367 console_blanked = fg_console + 1;
3368 if (i)
3369 set_origin(vc);
3370
3371 if (console_blank_hook && console_blank_hook(1))
3372 return;
3373
d060a321 3374 if (vesa_off_interval && vesa_blank_mode) {
030babac 3375 blank_state = blank_vesa_wait;
1da177e4
LT		 3376 mod_timer(&console_timer, jiffies + vesa_off_interval);
3377 }
1da177e4
LT		 3378}
3379EXPORT_SYMBOL(do_blank_screen);
3380
3381/*
3382 * Called by timer as well as from vt_console_driver
3383 */
3384void do_unblank_screen(int leaving_gfx)
3385{
3386 struct vc_data *vc;
3387
3388 /* This should now always be called from a "sane" (read: can schedule)
3389 * context for the sake of the low level drivers, except in the special
3390 * case of oops_in_progress
3391 */
3392 if (!oops_in_progress)
3393 might_sleep();
3394
3395 WARN_CONSOLE_UNLOCKED();
3396
3397 ignore_poke = 0;
3398 if (!console_blanked)
3399 return;
3400 if (!vc_cons_allocated(fg_console)) {
3401 /* impossible */
3402 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3403 return;
3404 }
3405 vc = vc_cons[fg_console].d;
3406 if (vc->vc_mode != KD_TEXT)
3407 return; /* but leave console_blanked != 0 */
3408
3409 if (blankinterval) {
3410 mod_timer(&console_timer, jiffies + blankinterval);
3411 blank_state = blank_normal_wait;
3412 }
3413
3414 console_blanked = 0;
3415 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3416 /* Low-level driver cannot restore -> do it ourselves */
3417 update_screen(vc);
3418 if (console_blank_hook)
3419 console_blank_hook(0);
3420 set_palette(vc);
3421 set_cursor(vc);
3422}
3423EXPORT_SYMBOL(do_unblank_screen);
3424
3425/*
3426 * This is called by the outside world to cause a forced unblank, mostly for
3427 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3428 * call it with 1 as an argument and so force a mode restore... that may kill
3429 * X or at least garbage the screen but would also make the Oops visible...
3430 */
3431void unblank_screen(void)
3432{
3433 do_unblank_screen(0);
3434}
3435
3436/*
70522e12 3437 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3438 * (console operations can still happen at irq time, but only from printk which
70522e12 3439 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3440 */
3441static void blank_screen_t(unsigned long dummy)
3442{
cc63b1e1
JB		 3443 if (unlikely(!keventd_up())) {
3444 mod_timer(&console_timer, jiffies + blankinterval);
3445 return;
3446 }
1da177e4
LT		 3447 blank_timer_expired = 1;
3448 schedule_work(&console_work);
3449}
3450
3451void poke_blanked_console(void)
3452{
3453 WARN_CONSOLE_UNLOCKED();
3454
3455 /* Add this so we quickly catch whoever might call us in a non
3456 * safe context. Nowadays, unblank_screen() isn't to be called in
3457 * atomic contexts and is allowed to schedule (with the special case
3458 * of oops_in_progress, but that isn't of any concern for this
3459 * function. --BenH.
3460 */
3461 might_sleep();
3462
3463 /* This isn't perfectly race free, but a race here would be mostly harmless,
3464 * at worse, we'll do a spurrious blank and it's unlikely
3465 */
3466 del_timer(&console_timer);
3467 blank_timer_expired = 0;
3468
3469 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3470 return;
3471 if (console_blanked)
3472 unblank_screen();
3473 else if (blankinterval) {
3474 mod_timer(&console_timer, jiffies + blankinterval);
3475 blank_state = blank_normal_wait;
3476 }
3477}
3478
3479/*
3480 * Palettes
3481 */
3482
3483static void set_palette(struct vc_data *vc)
3484{
3485 WARN_CONSOLE_UNLOCKED();
3486
3487 if (vc->vc_mode != KD_GRAPHICS)
3488 vc->vc_sw->con_set_palette(vc, color_table);
3489}
3490
3491static int set_get_cmap(unsigned char __user *arg, int set)
3492{
3493 int i, j, k;
3494
3495 WARN_CONSOLE_UNLOCKED();
3496
3497 for (i = 0; i < 16; i++)
3498 if (set) {
3499 get_user(default_red[i], arg++);
3500 get_user(default_grn[i], arg++);
3501 get_user(default_blu[i], arg++);
3502 } else {
3503 put_user(default_red[i], arg++);
3504 put_user(default_grn[i], arg++);
3505 put_user(default_blu[i], arg++);
3506 }
3507 if (set) {
3508 for (i = 0; i < MAX_NR_CONSOLES; i++)
3509 if (vc_cons_allocated(i)) {
3510 for (j = k = 0; j < 16; j++) {
3511 vc_cons[i].d->vc_palette[k++] = default_red[j];
3512 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3513 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3514 }
3515 set_palette(vc_cons[i].d);
3516 }
3517 }
3518 return 0;
3519}
3520
3521/*
3522 * Load palette into the DAC registers. arg points to a colour
3523 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3524 */
3525
3526int con_set_cmap(unsigned char __user *arg)
3527{
3528 int rc;
3529
3530 acquire_console_sem();
3531 rc = set_get_cmap (arg,1);
3532 release_console_sem();
3533
3534 return rc;
3535}
3536
3537int con_get_cmap(unsigned char __user *arg)
3538{
3539 int rc;
3540
3541 acquire_console_sem();
3542 rc = set_get_cmap (arg,0);
3543 release_console_sem();
3544
3545 return rc;
3546}
3547
3548void reset_palette(struct vc_data *vc)
3549{
3550 int j, k;
3551 for (j=k=0; j<16; j++) {
3552 vc->vc_palette[k++] = default_red[j];
3553 vc->vc_palette[k++] = default_grn[j];
3554 vc->vc_palette[k++] = default_blu[j];
3555 }
3556 set_palette(vc);
3557}
3558
3559/*
3560 * Font switching
3561 *
3562 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3563 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3564 * depending on width) reserved for each character which is kinda wasty, but
3565 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3566 * is upto the actual low-level console-driver convert data into its favorite
3567 * format (maybe we should add a `fontoffset' field to the `display'
3568 * structure so we won't have to convert the fontdata all the time.
3569 * /Jes
3570 */
3571
3572#define max_font_size 65536
3573
3574static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3575{
3576 struct console_font font;
3577 int rc = -EINVAL;
3578 int c;
3579
3580 if (vc->vc_mode != KD_TEXT)
3581 return -EINVAL;
3582
3583 if (op->data) {
3584 font.data = kmalloc(max_font_size, GFP_KERNEL);
3585 if (!font.data)
3586 return -ENOMEM;
3587 } else
3588 font.data = NULL;
3589
3590 acquire_console_sem();
3591 if (vc->vc_sw->con_font_get)
3592 rc = vc->vc_sw->con_font_get(vc, &font);
3593 else
3594 rc = -ENOSYS;
3595 release_console_sem();
3596
3597 if (rc)
3598 goto out;
3599
3600 c = (font.width+7)/8 * 32 * font.charcount;
3601
3602 if (op->data && font.charcount > op->charcount)
3603 rc = -ENOSPC;
3604 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3605 if (font.width > op->width || font.height > op->height)
3606 rc = -ENOSPC;
3607 } else {
3608 if (font.width != 8)
3609 rc = -EIO;
3610 else if ((op->height && font.height > op->height) ||
3611 font.height > 32)
3612 rc = -ENOSPC;
3613 }
3614 if (rc)
3615 goto out;
3616
3617 op->height = font.height;
3618 op->width = font.width;
3619 op->charcount = font.charcount;
3620
3621 if (op->data && copy_to_user(op->data, font.data, c))
3622 rc = -EFAULT;
3623
3624out:
3625 kfree(font.data);
3626 return rc;
3627}
3628
3629static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3630{
3631 struct console_font font;
3632 int rc = -EINVAL;
3633 int size;
3634
3635 if (vc->vc_mode != KD_TEXT)
3636 return -EINVAL;
3637 if (!op->data)
3638 return -EINVAL;
3639 if (op->charcount > 512)
3640 return -EINVAL;
3641 if (!op->height) { /* Need to guess font height [compat] */
3642 int h, i;
3643 u8 __user *charmap = op->data;
3644 u8 tmp;
3645
3646 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3647 so that we can get rid of this soon */
3648 if (!(op->flags & KD_FONT_FLAG_OLD))
3649 return -EINVAL;
3650 for (h = 32; h > 0; h--)
3651 for (i = 0; i < op->charcount; i++) {
3652 if (get_user(tmp, &charmap[32*i+h-1]))
3653 return -EFAULT;
3654 if (tmp)
3655 goto nonzero;
3656 }
3657 return -EINVAL;
3658 nonzero:
3659 op->height = h;
3660 }
3661 if (op->width <= 0 || op->width > 32 || op->height > 32)
3662 return -EINVAL;
3663 size = (op->width+7)/8 * 32 * op->charcount;
3664 if (size > max_font_size)
3665 return -ENOSPC;
3666 font.charcount = op->charcount;
3667 font.height = op->height;
3668 font.width = op->width;
3669 font.data = kmalloc(size, GFP_KERNEL);
3670 if (!font.data)
3671 return -ENOMEM;
3672 if (copy_from_user(font.data, op->data, size)) {
3673 kfree(font.data);
3674 return -EFAULT;
3675 }
3676 acquire_console_sem();
3677 if (vc->vc_sw->con_font_set)
3678 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3679 else
3680 rc = -ENOSYS;
3681 release_console_sem();
3682 kfree(font.data);
3683 return rc;
3684}
3685
3686static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3687{
3688 struct console_font font = {.width = op->width, .height = op->height};
3689 char name[MAX_FONT_NAME];
3690 char *s = name;
3691 int rc;
3692
3693 if (vc->vc_mode != KD_TEXT)
3694 return -EINVAL;
3695
3696 if (!op->data)
3697 s = NULL;
3698 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3699 return -EFAULT;
3700 else
3701 name[MAX_FONT_NAME - 1] = 0;
3702
3703 acquire_console_sem();
3704 if (vc->vc_sw->con_font_default)
3705 rc = vc->vc_sw->con_font_default(vc, &font, s);
3706 else
3707 rc = -ENOSYS;
3708 release_console_sem();
3709 if (!rc) {
3710 op->width = font.width;
3711 op->height = font.height;
3712 }
3713 return rc;
3714}
3715
3716static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3717{
3718 int con = op->height;
3719 int rc;
3720
3721 if (vc->vc_mode != KD_TEXT)
3722 return -EINVAL;
3723
3724 acquire_console_sem();
3725 if (!vc->vc_sw->con_font_copy)
3726 rc = -ENOSYS;
3727 else if (con < 0 || !vc_cons_allocated(con))
3728 rc = -ENOTTY;
3729 else if (con == vc->vc_num) /* nothing to do */
3730 rc = 0;
3731 else
3732 rc = vc->vc_sw->con_font_copy(vc, con);
3733 release_console_sem();
3734 return rc;
3735}
3736
3737int con_font_op(struct vc_data *vc, struct console_font_op *op)
3738{
3739 switch (op->op) {
3740 case KD_FONT_OP_SET:
3741 return con_font_set(vc, op);
3742 case KD_FONT_OP_GET:
3743 return con_font_get(vc, op);
3744 case KD_FONT_OP_SET_DEFAULT:
3745 return con_font_default(vc, op);
3746 case KD_FONT_OP_COPY:
3747 return con_font_copy(vc, op);
3748 }
3749 return -ENOSYS;
3750}
3751
3752/*
3753 * Interface exported to selection and vcs.
3754 */
3755
3756/* used by selection */
3757u16 screen_glyph(struct vc_data *vc, int offset)
3758{
3759 u16 w = scr_readw(screenpos(vc, offset, 1));
3760 u16 c = w & 0xff;
3761
3762 if (w & vc->vc_hi_font_mask)
3763 c |= 0x100;
3764 return c;
3765}
3766
3767/* used by vcs - note the word offset */
3768unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3769{
3770 return screenpos(vc, 2 * w_offset, viewed);
3771}
3772
3773void getconsxy(struct vc_data *vc, unsigned char *p)
3774{
3775 p[0] = vc->vc_x;
3776 p[1] = vc->vc_y;
3777}
3778
3779void putconsxy(struct vc_data *vc, unsigned char *p)
3780{
9477e260 3781 hide_cursor(vc);
1da177e4
LT		 3782 gotoxy(vc, p[0], p[1]);
3783 set_cursor(vc);
3784}
3785
3786u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3787{
3788 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3789 return softcursor_original;
3790 return scr_readw(org);
3791}
3792
3793void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3794{
3795 scr_writew(val, org);
3796 if ((unsigned long)org == vc->vc_pos) {
3797 softcursor_original = -1;
3798 add_softcursor(vc);
3799 }
3800}
3801
3802/*
3803 * Visible symbols for modules
3804 */
3805
3806EXPORT_SYMBOL(color_table);
3807EXPORT_SYMBOL(default_red);
3808EXPORT_SYMBOL(default_grn);
3809EXPORT_SYMBOL(default_blu);
3810EXPORT_SYMBOL(update_region);
3811EXPORT_SYMBOL(redraw_screen);
3812EXPORT_SYMBOL(vc_resize);
ca9bda00 3813EXPORT_SYMBOL(vc_lock_resize);
1da177e4
LT		 3814EXPORT_SYMBOL(fg_console);
3815EXPORT_SYMBOL(console_blank_hook);
3816EXPORT_SYMBOL(console_blanked);
3817EXPORT_SYMBOL(vc_cons);
3818#ifndef VT_SINGLE_DRIVER
3819EXPORT_SYMBOL(take_over_console);
3820EXPORT_SYMBOL(give_up_console);
3821#endif
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