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[PATCH] Fix SAK_work workqueue initialization.
[linux-2.6-block.git] / drivers / char / vt.c
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1da177e4
LT		 1/*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
d4328b40
AT		 66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
1da177e4
LT		 73 */
74
75#include <linux/module.h>
76#include <linux/types.h>
77#include <linux/sched.h>
78#include <linux/tty.h>
79#include <linux/tty_flip.h>
80#include <linux/kernel.h>
81#include <linux/string.h>
82#include <linux/errno.h>
83#include <linux/kd.h>
84#include <linux/slab.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
1da177e4
LT		 89#include <linux/vt_kern.h>
90#include <linux/selection.h>
91#include <linux/tiocl.h>
92#include <linux/kbd_kern.h>
93#include <linux/consolemap.h>
94#include <linux/timer.h>
95#include <linux/interrupt.h>
1da177e4
LT		 96#include <linux/workqueue.h>
97#include <linux/bootmem.h>
98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
101
102#include <asm/io.h>
103#include <asm/system.h>
104#include <asm/uaccess.h>
105
3e795de7 106#define MAX_NR_CON_DRIVER 16
1da177e4 107
6db4063c 108#define CON_DRIVER_FLAG_MODULE 1
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;
805952a8 115 struct device *dev;
6db4063c 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
1da177e4
LT		 139struct vc vc_cons [MAX_NR_CONSOLES];
140
141#ifndef VT_SINGLE_DRIVER
142static const struct consw *con_driver_map[MAX_NR_CONSOLES];
143#endif
144
145static int con_open(struct tty_struct *, struct file *);
146static void vc_init(struct vc_data *vc, unsigned int rows,
147 unsigned int cols, int do_clear);
148static void gotoxy(struct vc_data *vc, int new_x, int new_y);
149static void save_cur(struct vc_data *vc);
150static void reset_terminal(struct vc_data *vc, int do_clear);
151static void con_flush_chars(struct tty_struct *tty);
403aac96 152static int set_vesa_blanking(char __user *p);
1da177e4
LT		 153static void set_cursor(struct vc_data *vc);
154static void hide_cursor(struct vc_data *vc);
65f27f38 155static void console_callback(struct work_struct *ignored);
1da177e4
LT		 156static void blank_screen_t(unsigned long dummy);
157static void set_palette(struct vc_data *vc);
158
159static int printable; /* Is console ready for printing? */
160
161/*
162 * ignore_poke: don't unblank the screen when things are typed. This is
163 * mainly for the privacy of braille terminal users.
164 */
165static int ignore_poke;
166
167int do_poke_blanked_console;
168int console_blanked;
169
170static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
171static int blankinterval = 10*60*HZ;
172static int vesa_off_interval;
173
65f27f38 174static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 175
176/*
177 * fg_console is the current virtual console,
178 * last_console is the last used one,
179 * want_console is the console we want to switch to,
180 * kmsg_redirect is the console for kernel messages,
181 */
182int fg_console;
183int last_console;
184int want_console = -1;
185int kmsg_redirect;
186
187/*
188 * For each existing display, we have a pointer to console currently visible
189 * on that display, allowing consoles other than fg_console to be refreshed
190 * appropriately. Unless the low-level driver supplies its own display_fg
191 * variable, we use this one for the "master display".
192 */
193static struct vc_data *master_display_fg;
194
195/*
196 * Unfortunately, we need to delay tty echo when we're currently writing to the
197 * console since the code is (and always was) not re-entrant, so we schedule
198 * all flip requests to process context with schedule-task() and run it from
199 * console_callback().
200 */
201
202/*
203 * For the same reason, we defer scrollback to the console callback.
204 */
205static int scrollback_delta;
206
207/*
208 * Hook so that the power management routines can (un)blank
209 * the console on our behalf.
210 */
211int (*console_blank_hook)(int);
212
40565f19 213static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 214static int blank_state;
215static int blank_timer_expired;
216enum {
217 blank_off = 0,
218 blank_normal_wait,
219 blank_vesa_wait,
220};
221
222/*
223 * Low-Level Functions
224 */
225
226#define IS_FG(vc) ((vc)->vc_num == fg_console)
227
228#ifdef VT_BUF_VRAM_ONLY
229#define DO_UPDATE(vc) 0
230#else
231#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
232#endif
233
234static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
235{
236 unsigned short *p;
237
238 if (!viewed)
239 p = (unsigned short *)(vc->vc_origin + offset);
240 else if (!vc->vc_sw->con_screen_pos)
241 p = (unsigned short *)(vc->vc_visible_origin + offset);
242 else
243 p = vc->vc_sw->con_screen_pos(vc, offset);
244 return p;
245}
246
247static inline void scrolldelta(int lines)
248{
249 scrollback_delta += lines;
250 schedule_console_callback();
251}
252
253void schedule_console_callback(void)
254{
255 schedule_work(&console_work);
256}
257
258static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
259{
260 unsigned short *d, *s;
261
262 if (t+nr >= b)
263 nr = b - t - 1;
264 if (b > vc->vc_rows || t >= b || nr < 1)
265 return;
266 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
267 return;
268 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
269 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
270 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
271 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
272 vc->vc_size_row * nr);
273}
274
275static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
276{
277 unsigned short *s;
278 unsigned int step;
279
280 if (t+nr >= b)
281 nr = b - t - 1;
282 if (b > vc->vc_rows || t >= b || nr < 1)
283 return;
284 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
285 return;
286 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
287 step = vc->vc_cols * nr;
288 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
289 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
290}
291
292static void do_update_region(struct vc_data *vc, unsigned long start, int count)
293{
294#ifndef VT_BUF_VRAM_ONLY
295 unsigned int xx, yy, offset;
296 u16 *p;
297
298 p = (u16 *) start;
299 if (!vc->vc_sw->con_getxy) {
300 offset = (start - vc->vc_origin) / 2;
301 xx = offset % vc->vc_cols;
302 yy = offset / vc->vc_cols;
303 } else {
304 int nxx, nyy;
305 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
306 xx = nxx; yy = nyy;
307 }
308 for(;;) {
309 u16 attrib = scr_readw(p) & 0xff00;
310 int startx = xx;
311 u16 *q = p;
312 while (xx < vc->vc_cols && count) {
313 if (attrib != (scr_readw(p) & 0xff00)) {
314 if (p > q)
315 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
316 startx = xx;
317 q = p;
318 attrib = scr_readw(p) & 0xff00;
319 }
320 p++;
321 xx++;
322 count--;
323 }
324 if (p > q)
325 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
326 if (!count)
327 break;
328 xx = 0;
329 yy++;
330 if (vc->vc_sw->con_getxy) {
331 p = (u16 *)start;
332 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
333 }
334 }
335#endif
336}
337
338void update_region(struct vc_data *vc, unsigned long start, int count)
339{
340 WARN_CONSOLE_UNLOCKED();
341
342 if (DO_UPDATE(vc)) {
343 hide_cursor(vc);
344 do_update_region(vc, start, count);
345 set_cursor(vc);
346 }
347}
348
349/* Structure of attributes is hardware-dependent */
350
351static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
352{
353 if (vc->vc_sw->con_build_attr)
354 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
355
356#ifndef VT_BUF_VRAM_ONLY
357/*
358 * ++roman: I completely changed the attribute format for monochrome
359 * mode (!can_do_color). The formerly used MDA (monochrome display
360 * adapter) format didn't allow the combination of certain effects.
361 * Now the attribute is just a bit vector:
362 * Bit 0..1: intensity (0..2)
363 * Bit 2 : underline
364 * Bit 3 : reverse
365 * Bit 7 : blink
366 */
367 {
368 u8 a = vc->vc_color;
369 if (!vc->vc_can_do_color)
370 return _intensity |
371 (_underline ? 4 : 0) |
372 (_reverse ? 8 : 0) |
373 (_blink ? 0x80 : 0);
374 if (_underline)
375 a = (a & 0xf0) | vc->vc_ulcolor;
376 else if (_intensity == 0)
377 a = (a & 0xf0) | vc->vc_ulcolor;
378 if (_reverse)
379 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
380 if (_blink)
381 a ^= 0x80;
382 if (_intensity == 2)
383 a ^= 0x08;
384 if (vc->vc_hi_font_mask == 0x100)
385 a <<= 1;
386 return a;
387 }
388#else
389 return 0;
390#endif
391}
392
393static void update_attr(struct vc_data *vc)
394{
395 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
396 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
397}
398
399/* Note: inverting the screen twice should revert to the original state */
400void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
401{
402 unsigned short *p;
403
404 WARN_CONSOLE_UNLOCKED();
405
406 count /= 2;
407 p = screenpos(vc, offset, viewed);
408 if (vc->vc_sw->con_invert_region)
409 vc->vc_sw->con_invert_region(vc, p, count);
410#ifndef VT_BUF_VRAM_ONLY
411 else {
412 u16 *q = p;
413 int cnt = count;
414 u16 a;
415
416 if (!vc->vc_can_do_color) {
417 while (cnt--) {
418 a = scr_readw(q);
419 a ^= 0x0800;
420 scr_writew(a, q);
421 q++;
422 }
423 } else if (vc->vc_hi_font_mask == 0x100) {
424 while (cnt--) {
425 a = scr_readw(q);
426 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
427 scr_writew(a, q);
428 q++;
429 }
430 } else {
431 while (cnt--) {
432 a = scr_readw(q);
433 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
434 scr_writew(a, q);
435 q++;
436 }
437 }
438 }
439#endif
440 if (DO_UPDATE(vc))
441 do_update_region(vc, (unsigned long) p, count);
442}
443
444/* used by selection: complement pointer position */
445void complement_pos(struct vc_data *vc, int offset)
446{
414edcd3 447 static int old_offset = -1;
1da177e4
LT		 448 static unsigned short old;
449 static unsigned short oldx, oldy;
450
451 WARN_CONSOLE_UNLOCKED();
452
414edcd3
AD		 453 if (old_offset != -1 && old_offset >= 0 &&
454 old_offset < vc->vc_screenbuf_size) {
455 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 456 if (DO_UPDATE(vc))
457 vc->vc_sw->con_putc(vc, old, oldy, oldx);
458 }
414edcd3
AD		 459
460 old_offset = offset;
461
462 if (offset != -1 && offset >= 0 &&
463 offset < vc->vc_screenbuf_size) {
1da177e4 464 unsigned short new;
414edcd3 465 unsigned short *p;
1da177e4
LT		 466 p = screenpos(vc, offset, 1);
467 old = scr_readw(p);
468 new = old ^ vc->vc_complement_mask;
469 scr_writew(new, p);
470 if (DO_UPDATE(vc)) {
471 oldx = (offset >> 1) % vc->vc_cols;
472 oldy = (offset >> 1) / vc->vc_cols;
473 vc->vc_sw->con_putc(vc, new, oldy, oldx);
474 }
475 }
414edcd3 476
1da177e4
LT		 477}
478
479static void insert_char(struct vc_data *vc, unsigned int nr)
480{
481 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
482
483 p = q + vc->vc_cols - nr - vc->vc_x;
484 while (--p >= q)
485 scr_writew(scr_readw(p), p + nr);
486 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
487 vc->vc_need_wrap = 0;
488 if (DO_UPDATE(vc)) {
489 unsigned short oldattr = vc->vc_attr;
490 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
491 vc->vc_cols - vc->vc_x - nr);
492 vc->vc_attr = vc->vc_video_erase_char >> 8;
493 while (nr--)
494 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
495 vc->vc_attr = oldattr;
496 }
497}
498
499static void delete_char(struct vc_data *vc, unsigned int nr)
500{
501 unsigned int i = vc->vc_x;
502 unsigned short *p = (unsigned short *)vc->vc_pos;
503
504 while (++i <= vc->vc_cols - nr) {
505 scr_writew(scr_readw(p+nr), p);
506 p++;
507 }
508 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
509 vc->vc_need_wrap = 0;
510 if (DO_UPDATE(vc)) {
511 unsigned short oldattr = vc->vc_attr;
512 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
513 vc->vc_cols - vc->vc_x - nr);
514 vc->vc_attr = vc->vc_video_erase_char >> 8;
515 while (nr--)
516 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
517 vc->vc_cols - 1 - nr);
518 vc->vc_attr = oldattr;
519 }
520}
521
522static int softcursor_original;
523
524static void add_softcursor(struct vc_data *vc)
525{
526 int i = scr_readw((u16 *) vc->vc_pos);
527 u32 type = vc->vc_cursor_type;
528
529 if (! (type & 0x10)) return;
530 if (softcursor_original != -1) return;
531 softcursor_original = i;
532 i |= ((type >> 8) & 0xff00 );
533 i ^= ((type) & 0xff00 );
534 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
535 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
536 scr_writew(i, (u16 *) vc->vc_pos);
537 if (DO_UPDATE(vc))
538 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
539}
540
541static void hide_softcursor(struct vc_data *vc)
542{
543 if (softcursor_original != -1) {
544 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
545 if (DO_UPDATE(vc))
546 vc->vc_sw->con_putc(vc, softcursor_original,
547 vc->vc_y, vc->vc_x);
548 softcursor_original = -1;
549 }
550}
551
552static void hide_cursor(struct vc_data *vc)
553{
554 if (vc == sel_cons)
555 clear_selection();
556 vc->vc_sw->con_cursor(vc, CM_ERASE);
557 hide_softcursor(vc);
558}
559
560static void set_cursor(struct vc_data *vc)
561{
562 if (!IS_FG(vc) || console_blanked ||
563 vc->vc_mode == KD_GRAPHICS)
564 return;
565 if (vc->vc_deccm) {
566 if (vc == sel_cons)
567 clear_selection();
568 add_softcursor(vc);
569 if ((vc->vc_cursor_type & 0x0f) != 1)
570 vc->vc_sw->con_cursor(vc, CM_DRAW);
571 } else
572 hide_cursor(vc);
573}
574
575static void set_origin(struct vc_data *vc)
576{
577 WARN_CONSOLE_UNLOCKED();
578
579 if (!CON_IS_VISIBLE(vc) ||
580 !vc->vc_sw->con_set_origin ||
581 !vc->vc_sw->con_set_origin(vc))
582 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
583 vc->vc_visible_origin = vc->vc_origin;
584 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
585 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
586}
587
588static inline void save_screen(struct vc_data *vc)
589{
590 WARN_CONSOLE_UNLOCKED();
591
592 if (vc->vc_sw->con_save_screen)
593 vc->vc_sw->con_save_screen(vc);
594}
595
596/*
597 * Redrawing of screen
598 */
599
600static void clear_buffer_attributes(struct vc_data *vc)
601{
602 unsigned short *p = (unsigned short *)vc->vc_origin;
603 int count = vc->vc_screenbuf_size / 2;
604 int mask = vc->vc_hi_font_mask | 0xff;
605
606 for (; count > 0; count--, p++) {
607 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
608 }
609}
610
611void redraw_screen(struct vc_data *vc, int is_switch)
612{
613 int redraw = 0;
614
615 WARN_CONSOLE_UNLOCKED();
616
617 if (!vc) {
618 /* strange ... */
619 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
620 return;
621 }
622
623 if (is_switch) {
624 struct vc_data *old_vc = vc_cons[fg_console].d;
625 if (old_vc == vc)
626 return;
627 if (!CON_IS_VISIBLE(vc))
628 redraw = 1;
629 *vc->vc_display_fg = vc;
630 fg_console = vc->vc_num;
631 hide_cursor(old_vc);
632 if (!CON_IS_VISIBLE(old_vc)) {
633 save_screen(old_vc);
634 set_origin(old_vc);
635 }
636 } else {
637 hide_cursor(vc);
638 redraw = 1;
639 }
640
641 if (redraw) {
642 int update;
643 int old_was_color = vc->vc_can_do_color;
644
645 set_origin(vc);
646 update = vc->vc_sw->con_switch(vc);
647 set_palette(vc);
648 /*
649 * If console changed from mono<->color, the best we can do
650 * is to clear the buffer attributes. As it currently stands,
651 * rebuilding new attributes from the old buffer is not doable
652 * without overly complex code.
653 */
654 if (old_was_color != vc->vc_can_do_color) {
655 update_attr(vc);
656 clear_buffer_attributes(vc);
657 }
658 if (update && vc->vc_mode != KD_GRAPHICS)
659 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
660 }
661 set_cursor(vc);
662 if (is_switch) {
663 set_leds();
664 compute_shiftstate();
665 }
666}
667
668/*
669 * Allocation, freeing and resizing of VTs.
670 */
671
672int vc_cons_allocated(unsigned int i)
673{
674 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
675}
676
677static void visual_init(struct vc_data *vc, int num, int init)
678{
679 /* ++Geert: vc->vc_sw->con_init determines console size */
680 if (vc->vc_sw)
681 module_put(vc->vc_sw->owner);
682 vc->vc_sw = conswitchp;
683#ifndef VT_SINGLE_DRIVER
684 if (con_driver_map[num])
685 vc->vc_sw = con_driver_map[num];
686#endif
687 __module_get(vc->vc_sw->owner);
688 vc->vc_num = num;
689 vc->vc_display_fg = &master_display_fg;
690 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
691 vc->vc_uni_pagedir = 0;
692 vc->vc_hi_font_mask = 0;
693 vc->vc_complement_mask = 0;
694 vc->vc_can_do_color = 0;
695 vc->vc_sw->con_init(vc, init);
696 if (!vc->vc_complement_mask)
697 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
698 vc->vc_s_complement_mask = vc->vc_complement_mask;
699 vc->vc_size_row = vc->vc_cols << 1;
700 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
701}
702
703int vc_allocate(unsigned int currcons) /* return 0 on success */
704{
705 WARN_CONSOLE_UNLOCKED();
706
707 if (currcons >= MAX_NR_CONSOLES)
708 return -ENXIO;
709 if (!vc_cons[currcons].d) {
710 struct vc_data *vc;
711
712 /* prevent users from taking too much memory */
713 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
714 return -EPERM;
715
716 /* due to the granularity of kmalloc, we waste some memory here */
717 /* the alloc is done in two steps, to optimize the common situation
718 of a 25x80 console (structsize=216, screenbuf_size=4000) */
719 /* although the numbers above are not valid since long ago, the
720 point is still up-to-date and the comment still has its value
721 even if only as a historical artifact. --mj, July 1998 */
722 vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
723 if (!vc)
724 return -ENOMEM;
725 memset(vc, 0, sizeof(*vc));
726 vc_cons[currcons].d = vc;
727 visual_init(vc, currcons, 1);
728 if (!*vc->vc_uni_pagedir_loc)
729 con_set_default_unimap(vc);
254e948b
CM		 730 if (!vc->vc_kmalloced)
731 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 732 if (!vc->vc_screenbuf) {
733 kfree(vc);
734 vc_cons[currcons].d = NULL;
735 return -ENOMEM;
736 }
737 vc->vc_kmalloced = 1;
738 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
739 }
740 return 0;
741}
742
743static inline int resize_screen(struct vc_data *vc, int width, int height)
744{
745 /* Resizes the resolution of the display adapater */
746 int err = 0;
747
748 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
749 err = vc->vc_sw->con_resize(vc, width, height);
750 return err;
751}
752
753/*
754 * Change # of rows and columns (0 means unchanged/the size of fg_console)
755 * [this is to be used together with some user program
756 * like resize that changes the hardware videomode]
757 */
758#define VC_RESIZE_MAXCOL (32767)
759#define VC_RESIZE_MAXROW (32767)
760int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
761{
762 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
763 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
764 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
3b41dc1a 765 unsigned int end;
1da177e4
LT		 766 unsigned short *newscreen;
767
768 WARN_CONSOLE_UNLOCKED();
769
770 if (!vc)
771 return -ENXIO;
772
773 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
774 return -EINVAL;
775
776 new_cols = (cols ? cols : vc->vc_cols);
777 new_rows = (lines ? lines : vc->vc_rows);
778 new_row_size = new_cols << 1;
779 new_screen_size = new_row_size * new_rows;
780
781 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
782 return 0;
783
5cbded58 784 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 785 if (!newscreen)
786 return -ENOMEM;
787
788 old_rows = vc->vc_rows;
789 old_cols = vc->vc_cols;
790 old_row_size = vc->vc_size_row;
791 old_screen_size = vc->vc_screenbuf_size;
792
793 err = resize_screen(vc, new_cols, new_rows);
794 if (err) {
795 kfree(newscreen);
796 return err;
797 }
798
799 vc->vc_rows = new_rows;
800 vc->vc_cols = new_cols;
801 vc->vc_size_row = new_row_size;
802 vc->vc_screenbuf_size = new_screen_size;
803
804 rlth = min(old_row_size, new_row_size);
805 rrem = new_row_size - rlth;
806 old_origin = vc->vc_origin;
807 new_origin = (long) newscreen;
808 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 809
810 if (vc->vc_y > new_rows) {
811 if (old_rows - vc->vc_y < new_rows) {
812 /*
813 * Cursor near the bottom, copy contents from the
814 * bottom of buffer
815 */
816 old_origin += (old_rows - new_rows) * old_row_size;
817 end = vc->vc_scr_end;
818 } else {
819 /*
820 * Cursor is in no man's land, copy 1/2 screenful
821 * from the top and bottom of cursor position
822 */
823 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 824 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 825 }
826 } else
827 /*
828 * Cursor near the top, copy contents from the top of buffer
829 */
065d9cac
AD		 830 end = (old_rows > new_rows) ? old_origin +
831 (old_row_size * new_rows) :
3b41dc1a 832 vc->vc_scr_end;
1da177e4
LT		 833
834 update_attr(vc);
835
3b41dc1a
AD		 836 while (old_origin < end) {
837 scr_memcpyw((unsigned short *) new_origin,
838 (unsigned short *) old_origin, rlth);
1da177e4 839 if (rrem)
3b41dc1a
AD		 840 scr_memsetw((void *)(new_origin + rlth),
841 vc->vc_video_erase_char, rrem);
1da177e4
LT		 842 old_origin += old_row_size;
843 new_origin += new_row_size;
844 }
845 if (new_scr_end > new_origin)
3b41dc1a
AD		 846 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
847 new_scr_end - new_origin);
1da177e4
LT		 848 if (vc->vc_kmalloced)
849 kfree(vc->vc_screenbuf);
850 vc->vc_screenbuf = newscreen;
851 vc->vc_kmalloced = 1;
852 vc->vc_screenbuf_size = new_screen_size;
853 set_origin(vc);
854
855 /* do part of a reset_terminal() */
856 vc->vc_top = 0;
857 vc->vc_bottom = vc->vc_rows;
858 gotoxy(vc, vc->vc_x, vc->vc_y);
859 save_cur(vc);
860
861 if (vc->vc_tty) {
862 struct winsize ws, *cws = &vc->vc_tty->winsize;
863
864 memset(&ws, 0, sizeof(ws));
865 ws.ws_row = vc->vc_rows;
866 ws.ws_col = vc->vc_cols;
867 ws.ws_ypixel = vc->vc_scan_lines;
868 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
ab521dc0
EB		 869 vc->vc_tty->pgrp)
870 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
1da177e4
LT		 871 *cws = ws;
872 }
873
874 if (CON_IS_VISIBLE(vc))
875 update_screen(vc);
876 return err;
877}
878
ca9bda00
AC		 879int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
880{
881 int rc;
882
883 acquire_console_sem();
884 rc = vc_resize(vc, cols, lines);
885 release_console_sem();
886 return rc;
887}
1da177e4 888
ca9bda00 889void vc_deallocate(unsigned int currcons)
1da177e4
LT		 890{
891 WARN_CONSOLE_UNLOCKED();
892
893 if (vc_cons_allocated(currcons)) {
894 struct vc_data *vc = vc_cons[currcons].d;
895 vc->vc_sw->con_deinit(vc);
bde0d2c9 896 put_pid(vc->vt_pid);
d459ec0b 897 module_put(vc->vc_sw->owner);
1da177e4
LT		 898 if (vc->vc_kmalloced)
899 kfree(vc->vc_screenbuf);
900 if (currcons >= MIN_NR_CONSOLES)
901 kfree(vc);
902 vc_cons[currcons].d = NULL;
903 }
904}
905
906/*
907 * VT102 emulator
908 */
909
910#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
911#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
912#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
913
914#define decarm VC_REPEAT
915#define decckm VC_CKMODE
916#define kbdapplic VC_APPLIC
917#define lnm VC_CRLF
918
919/*
920 * this is what the terminal answers to a ESC-Z or csi0c query.
921 */
922#define VT100ID "\033[?1;2c"
923#define VT102ID "\033[?6c"
924
925unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
926 8,12,10,14, 9,13,11,15 };
927
928/* the default colour table, for VGA+ colour systems */
929int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
930 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
931int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
932 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
933int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
934 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
935
936/*
937 * gotoxy() must verify all boundaries, because the arguments
938 * might also be negative. If the given position is out of
939 * bounds, the cursor is placed at the nearest margin.
940 */
941static void gotoxy(struct vc_data *vc, int new_x, int new_y)
942{
943 int min_y, max_y;
944
945 if (new_x < 0)
946 vc->vc_x = 0;
947 else {
948 if (new_x >= vc->vc_cols)
949 vc->vc_x = vc->vc_cols - 1;
950 else
951 vc->vc_x = new_x;
952 }
953
954 if (vc->vc_decom) {
955 min_y = vc->vc_top;
956 max_y = vc->vc_bottom;
957 } else {
958 min_y = 0;
959 max_y = vc->vc_rows;
960 }
961 if (new_y < min_y)
962 vc->vc_y = min_y;
963 else if (new_y >= max_y)
964 vc->vc_y = max_y - 1;
965 else
966 vc->vc_y = new_y;
967 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
968 vc->vc_need_wrap = 0;
969}
970
971/* for absolute user moves, when decom is set */
972static void gotoxay(struct vc_data *vc, int new_x, int new_y)
973{
974 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
975}
976
977void scrollback(struct vc_data *vc, int lines)
978{
979 if (!lines)
980 lines = vc->vc_rows / 2;
981 scrolldelta(-lines);
982}
983
984void scrollfront(struct vc_data *vc, int lines)
985{
986 if (!lines)
987 lines = vc->vc_rows / 2;
988 scrolldelta(lines);
989}
990
991static void lf(struct vc_data *vc)
992{
993 /* don't scroll if above bottom of scrolling region, or
994 * if below scrolling region
995 */
996 if (vc->vc_y + 1 == vc->vc_bottom)
997 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
998 else if (vc->vc_y < vc->vc_rows - 1) {
999 vc->vc_y++;
1000 vc->vc_pos += vc->vc_size_row;
1001 }
1002 vc->vc_need_wrap = 0;
1003}
1004
1005static void ri(struct vc_data *vc)
1006{
1007 /* don't scroll if below top of scrolling region, or
1008 * if above scrolling region
1009 */
1010 if (vc->vc_y == vc->vc_top)
1011 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1012 else if (vc->vc_y > 0) {
1013 vc->vc_y--;
1014 vc->vc_pos -= vc->vc_size_row;
1015 }
1016 vc->vc_need_wrap = 0;
1017}
1018
1019static inline void cr(struct vc_data *vc)
1020{
1021 vc->vc_pos -= vc->vc_x << 1;
1022 vc->vc_need_wrap = vc->vc_x = 0;
1023}
1024
1025static inline void bs(struct vc_data *vc)
1026{
1027 if (vc->vc_x) {
1028 vc->vc_pos -= 2;
1029 vc->vc_x--;
1030 vc->vc_need_wrap = 0;
1031 }
1032}
1033
1034static inline void del(struct vc_data *vc)
1035{
1036 /* ignored */
1037}
1038
1039static void csi_J(struct vc_data *vc, int vpar)
1040{
1041 unsigned int count;
1042 unsigned short * start;
1043
1044 switch (vpar) {
1045 case 0: /* erase from cursor to end of display */
1046 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1047 start = (unsigned short *)vc->vc_pos;
1048 if (DO_UPDATE(vc)) {
1049 /* do in two stages */
1050 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1051 vc->vc_cols - vc->vc_x);
1052 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1053 vc->vc_rows - vc->vc_y - 1,
1054 vc->vc_cols);
1055 }
1056 break;
1057 case 1: /* erase from start to cursor */
1058 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1059 start = (unsigned short *)vc->vc_origin;
1060 if (DO_UPDATE(vc)) {
1061 /* do in two stages */
1062 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1063 vc->vc_cols);
1064 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1065 vc->vc_x + 1);
1066 }
1067 break;
1068 case 2: /* erase whole display */
1069 count = vc->vc_cols * vc->vc_rows;
1070 start = (unsigned short *)vc->vc_origin;
1071 if (DO_UPDATE(vc))
1072 vc->vc_sw->con_clear(vc, 0, 0,
1073 vc->vc_rows,
1074 vc->vc_cols);
1075 break;
1076 default:
1077 return;
1078 }
1079 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1080 vc->vc_need_wrap = 0;
1081}
1082
1083static void csi_K(struct vc_data *vc, int vpar)
1084{
1085 unsigned int count;
1086 unsigned short * start;
1087
1088 switch (vpar) {
1089 case 0: /* erase from cursor to end of line */
1090 count = vc->vc_cols - vc->vc_x;
1091 start = (unsigned short *)vc->vc_pos;
1092 if (DO_UPDATE(vc))
1093 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1094 vc->vc_cols - vc->vc_x);
1095 break;
1096 case 1: /* erase from start of line to cursor */
1097 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1098 count = vc->vc_x + 1;
1099 if (DO_UPDATE(vc))
1100 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1101 vc->vc_x + 1);
1102 break;
1103 case 2: /* erase whole line */
1104 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1105 count = vc->vc_cols;
1106 if (DO_UPDATE(vc))
1107 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1108 vc->vc_cols);
1109 break;
1110 default:
1111 return;
1112 }
1113 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1114 vc->vc_need_wrap = 0;
1115}
1116
1117static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1118{ /* not vt100? */
1119 int count;
1120
1121 if (!vpar)
1122 vpar++;
1123 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1124
1125 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1126 if (DO_UPDATE(vc))
1127 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1128 vc->vc_need_wrap = 0;
1129}
1130
1131static void default_attr(struct vc_data *vc)
1132{
1133 vc->vc_intensity = 1;
1134 vc->vc_underline = 0;
1135 vc->vc_reverse = 0;
1136 vc->vc_blink = 0;
1137 vc->vc_color = vc->vc_def_color;
1138}
1139
1140/* console_sem is held */
1141static void csi_m(struct vc_data *vc)
1142{
1143 int i;
1144
1145 for (i = 0; i <= vc->vc_npar; i++)
1146 switch (vc->vc_par[i]) {
1147 case 0: /* all attributes off */
1148 default_attr(vc);
1149 break;
1150 case 1:
1151 vc->vc_intensity = 2;
1152 break;
1153 case 2:
1154 vc->vc_intensity = 0;
1155 break;
1156 case 4:
1157 vc->vc_underline = 1;
1158 break;
1159 case 5:
1160 vc->vc_blink = 1;
1161 break;
1162 case 7:
1163 vc->vc_reverse = 1;
1164 break;
1165 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1166 * Select primary font, don't display
1167 * control chars if defined, don't set
1168 * bit 8 on output.
1169 */
1170 vc->vc_translate = set_translate(vc->vc_charset == 0
1171 ? vc->vc_G0_charset
1172 : vc->vc_G1_charset, vc);
1173 vc->vc_disp_ctrl = 0;
1174 vc->vc_toggle_meta = 0;
1175 break;
1176 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1177 * Select first alternate font, lets
1178 * chars < 32 be displayed as ROM chars.
1179 */
1180 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1181 vc->vc_disp_ctrl = 1;
1182 vc->vc_toggle_meta = 0;
1183 break;
1184 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1185 * Select second alternate font, toggle
1186 * high bit before displaying as ROM char.
1187 */
1188 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1189 vc->vc_disp_ctrl = 1;
1190 vc->vc_toggle_meta = 1;
1191 break;
1192 case 21:
1193 case 22:
1194 vc->vc_intensity = 1;
1195 break;
1196 case 24:
1197 vc->vc_underline = 0;
1198 break;
1199 case 25:
1200 vc->vc_blink = 0;
1201 break;
1202 case 27:
1203 vc->vc_reverse = 0;
1204 break;
1205 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1206 * Enables underscore, white foreground
1207 * with white underscore (Linux - use
1208 * default foreground).
1209 */
1210 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1211 vc->vc_underline = 1;
1212 break;
1213 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1214 * Disable underline option.
1215 * Reset colour to default? It did this
1216 * before...
1217 */
1218 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1219 vc->vc_underline = 0;
1220 break;
1221 case 49:
1222 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1223 break;
1224 default:
1225 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1226 vc->vc_color = color_table[vc->vc_par[i] - 30]
1227 | (vc->vc_color & 0xf0);
1228 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1229 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1230 | (vc->vc_color & 0x0f);
1231 break;
1232 }
1233 update_attr(vc);
1234}
1235
1236static void respond_string(const char *p, struct tty_struct *tty)
1237{
1238 while (*p) {
1239 tty_insert_flip_char(tty, *p, 0);
1240 p++;
1241 }
1242 con_schedule_flip(tty);
1243}
1244
1245static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1246{
1247 char buf[40];
1248
1249 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1250 respond_string(buf, tty);
1251}
1252
1253static inline void status_report(struct tty_struct *tty)
1254{
1255 respond_string("\033[0n", tty); /* Terminal ok */
1256}
1257
1258static inline void respond_ID(struct tty_struct * tty)
1259{
1260 respond_string(VT102ID, tty);
1261}
1262
1263void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1264{
1265 char buf[8];
1266
1267 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1268 (char)('!' + mry));
1269 respond_string(buf, tty);
1270}
1271
1272/* invoked via ioctl(TIOCLINUX) and through set_selection */
1273int mouse_reporting(void)
1274{
1275 return vc_cons[fg_console].d->vc_report_mouse;
1276}
1277
1278/* console_sem is held */
1279static void set_mode(struct vc_data *vc, int on_off)
1280{
1281 int i;
1282
1283 for (i = 0; i <= vc->vc_npar; i++)
1284 if (vc->vc_ques) {
1285 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1286 case 1: /* Cursor keys send ^[Ox/^[[x */
1287 if (on_off)
1288 set_kbd(vc, decckm);
1289 else
1290 clr_kbd(vc, decckm);
1291 break;
1292 case 3: /* 80/132 mode switch unimplemented */
1293 vc->vc_deccolm = on_off;
1294#if 0
1295 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1296 /* this alone does not suffice; some user mode
1297 utility has to change the hardware regs */
1298#endif
1299 break;
1300 case 5: /* Inverted screen on/off */
1301 if (vc->vc_decscnm != on_off) {
1302 vc->vc_decscnm = on_off;
1303 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1304 update_attr(vc);
1305 }
1306 break;
1307 case 6: /* Origin relative/absolute */
1308 vc->vc_decom = on_off;
1309 gotoxay(vc, 0, 0);
1310 break;
1311 case 7: /* Autowrap on/off */
1312 vc->vc_decawm = on_off;
1313 break;
1314 case 8: /* Autorepeat on/off */
1315 if (on_off)
1316 set_kbd(vc, decarm);
1317 else
1318 clr_kbd(vc, decarm);
1319 break;
1320 case 9:
1321 vc->vc_report_mouse = on_off ? 1 : 0;
1322 break;
1323 case 25: /* Cursor on/off */
1324 vc->vc_deccm = on_off;
1325 break;
1326 case 1000:
1327 vc->vc_report_mouse = on_off ? 2 : 0;
1328 break;
1329 }
1330 } else {
1331 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1332 case 3: /* Monitor (display ctrls) */
1333 vc->vc_disp_ctrl = on_off;
1334 break;
1335 case 4: /* Insert Mode on/off */
1336 vc->vc_decim = on_off;
1337 break;
1338 case 20: /* Lf, Enter == CrLf/Lf */
1339 if (on_off)
1340 set_kbd(vc, lnm);
1341 else
1342 clr_kbd(vc, lnm);
1343 break;
1344 }
1345 }
1346}
1347
1348/* console_sem is held */
1349static void setterm_command(struct vc_data *vc)
1350{
1351 switch(vc->vc_par[0]) {
1352 case 1: /* set color for underline mode */
1353 if (vc->vc_can_do_color &&
1354 vc->vc_par[1] < 16) {
1355 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1356 if (vc->vc_underline)
1357 update_attr(vc);
1358 }
1359 break;
1360 case 2: /* set color for half intensity mode */
1361 if (vc->vc_can_do_color &&
1362 vc->vc_par[1] < 16) {
1363 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1364 if (vc->vc_intensity == 0)
1365 update_attr(vc);
1366 }
1367 break;
1368 case 8: /* store colors as defaults */
1369 vc->vc_def_color = vc->vc_attr;
1370 if (vc->vc_hi_font_mask == 0x100)
1371 vc->vc_def_color >>= 1;
1372 default_attr(vc);
1373 update_attr(vc);
1374 break;
1375 case 9: /* set blanking interval */
1376 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1377 poke_blanked_console();
1378 break;
1379 case 10: /* set bell frequency in Hz */
1380 if (vc->vc_npar >= 1)
1381 vc->vc_bell_pitch = vc->vc_par[1];
1382 else
1383 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1384 break;
1385 case 11: /* set bell duration in msec */
1386 if (vc->vc_npar >= 1)
1387 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1388 vc->vc_par[1] * HZ / 1000 : 0;
1389 else
1390 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1391 break;
1392 case 12: /* bring specified console to the front */
1393 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1394 set_console(vc->vc_par[1] - 1);
1395 break;
1396 case 13: /* unblank the screen */
1397 poke_blanked_console();
1398 break;
1399 case 14: /* set vesa powerdown interval */
1400 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1401 break;
1402 case 15: /* activate the previous console */
1403 set_console(last_console);
1404 break;
1405 }
1406}
1407
1408/* console_sem is held */
1409static void csi_at(struct vc_data *vc, unsigned int nr)
1410{
1411 if (nr > vc->vc_cols - vc->vc_x)
1412 nr = vc->vc_cols - vc->vc_x;
1413 else if (!nr)
1414 nr = 1;
1415 insert_char(vc, nr);
1416}
1417
1418/* console_sem is held */
1419static void csi_L(struct vc_data *vc, unsigned int nr)
1420{
1421 if (nr > vc->vc_rows - vc->vc_y)
1422 nr = vc->vc_rows - vc->vc_y;
1423 else if (!nr)
1424 nr = 1;
1425 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1426 vc->vc_need_wrap = 0;
1427}
1428
1429/* console_sem is held */
1430static void csi_P(struct vc_data *vc, unsigned int nr)
1431{
1432 if (nr > vc->vc_cols - vc->vc_x)
1433 nr = vc->vc_cols - vc->vc_x;
1434 else if (!nr)
1435 nr = 1;
1436 delete_char(vc, nr);
1437}
1438
1439/* console_sem is held */
1440static void csi_M(struct vc_data *vc, unsigned int nr)
1441{
1442 if (nr > vc->vc_rows - vc->vc_y)
1443 nr = vc->vc_rows - vc->vc_y;
1444 else if (!nr)
1445 nr=1;
1446 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1447 vc->vc_need_wrap = 0;
1448}
1449
1450/* console_sem is held (except via vc_init->reset_terminal */
1451static void save_cur(struct vc_data *vc)
1452{
1453 vc->vc_saved_x = vc->vc_x;
1454 vc->vc_saved_y = vc->vc_y;
1455 vc->vc_s_intensity = vc->vc_intensity;
1456 vc->vc_s_underline = vc->vc_underline;
1457 vc->vc_s_blink = vc->vc_blink;
1458 vc->vc_s_reverse = vc->vc_reverse;
1459 vc->vc_s_charset = vc->vc_charset;
1460 vc->vc_s_color = vc->vc_color;
1461 vc->vc_saved_G0 = vc->vc_G0_charset;
1462 vc->vc_saved_G1 = vc->vc_G1_charset;
1463}
1464
1465/* console_sem is held */
1466static void restore_cur(struct vc_data *vc)
1467{
1468 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1469 vc->vc_intensity = vc->vc_s_intensity;
1470 vc->vc_underline = vc->vc_s_underline;
1471 vc->vc_blink = vc->vc_s_blink;
1472 vc->vc_reverse = vc->vc_s_reverse;
1473 vc->vc_charset = vc->vc_s_charset;
1474 vc->vc_color = vc->vc_s_color;
1475 vc->vc_G0_charset = vc->vc_saved_G0;
1476 vc->vc_G1_charset = vc->vc_saved_G1;
1477 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1478 update_attr(vc);
1479 vc->vc_need_wrap = 0;
1480}
1481
1482enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1483 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1484 ESpalette };
1485
1486/* console_sem is held (except via vc_init()) */
1487static void reset_terminal(struct vc_data *vc, int do_clear)
1488{
1489 vc->vc_top = 0;
1490 vc->vc_bottom = vc->vc_rows;
1491 vc->vc_state = ESnormal;
1492 vc->vc_ques = 0;
1493 vc->vc_translate = set_translate(LAT1_MAP, vc);
1494 vc->vc_G0_charset = LAT1_MAP;
1495 vc->vc_G1_charset = GRAF_MAP;
1496 vc->vc_charset = 0;
1497 vc->vc_need_wrap = 0;
1498 vc->vc_report_mouse = 0;
1499 vc->vc_utf = 0;
1500 vc->vc_utf_count = 0;
1501
1502 vc->vc_disp_ctrl = 0;
1503 vc->vc_toggle_meta = 0;
1504
1505 vc->vc_decscnm = 0;
1506 vc->vc_decom = 0;
1507 vc->vc_decawm = 1;
1508 vc->vc_deccm = 1;
1509 vc->vc_decim = 0;
1510
1511 set_kbd(vc, decarm);
1512 clr_kbd(vc, decckm);
1513 clr_kbd(vc, kbdapplic);
1514 clr_kbd(vc, lnm);
1515 kbd_table[vc->vc_num].lockstate = 0;
1516 kbd_table[vc->vc_num].slockstate = 0;
1517 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1518 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1519 /* do not do set_leds here because this causes an endless tasklet loop
1520 when the keyboard hasn't been initialized yet */
1521
1522 vc->vc_cursor_type = CUR_DEFAULT;
1523 vc->vc_complement_mask = vc->vc_s_complement_mask;
1524
1525 default_attr(vc);
1526 update_attr(vc);
1527
1528 vc->vc_tab_stop[0] = 0x01010100;
1529 vc->vc_tab_stop[1] =
1530 vc->vc_tab_stop[2] =
1531 vc->vc_tab_stop[3] =
1532 vc->vc_tab_stop[4] = 0x01010101;
1533
1534 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1535 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1536
1537 gotoxy(vc, 0, 0);
1538 save_cur(vc);
1539 if (do_clear)
1540 csi_J(vc, 2);
1541}
1542
1543/* console_sem is held */
1544static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1545{
1546 /*
1547 * Control characters can be used in the _middle_
1548 * of an escape sequence.
1549 */
1550 switch (c) {
1551 case 0:
1552 return;
1553 case 7:
1554 if (vc->vc_bell_duration)
1555 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1556 return;
1557 case 8:
1558 bs(vc);
1559 return;
1560 case 9:
1561 vc->vc_pos -= (vc->vc_x << 1);
1562 while (vc->vc_x < vc->vc_cols - 1) {
1563 vc->vc_x++;
1564 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1565 break;
1566 }
1567 vc->vc_pos += (vc->vc_x << 1);
1568 return;
1569 case 10: case 11: case 12:
1570 lf(vc);
1571 if (!is_kbd(vc, lnm))
1572 return;
1573 case 13:
1574 cr(vc);
1575 return;
1576 case 14:
1577 vc->vc_charset = 1;
1578 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1579 vc->vc_disp_ctrl = 1;
1580 return;
1581 case 15:
1582 vc->vc_charset = 0;
1583 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1584 vc->vc_disp_ctrl = 0;
1585 return;
1586 case 24: case 26:
1587 vc->vc_state = ESnormal;
1588 return;
1589 case 27:
1590 vc->vc_state = ESesc;
1591 return;
1592 case 127:
1593 del(vc);
1594 return;
1595 case 128+27:
1596 vc->vc_state = ESsquare;
1597 return;
1598 }
1599 switch(vc->vc_state) {
1600 case ESesc:
1601 vc->vc_state = ESnormal;
1602 switch (c) {
1603 case '[':
1604 vc->vc_state = ESsquare;
1605 return;
1606 case ']':
1607 vc->vc_state = ESnonstd;
1608 return;
1609 case '%':
1610 vc->vc_state = ESpercent;
1611 return;
1612 case 'E':
1613 cr(vc);
1614 lf(vc);
1615 return;
1616 case 'M':
1617 ri(vc);
1618 return;
1619 case 'D':
1620 lf(vc);
1621 return;
1622 case 'H':
1623 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1624 return;
1625 case 'Z':
1626 respond_ID(tty);
1627 return;
1628 case '7':
1629 save_cur(vc);
1630 return;
1631 case '8':
1632 restore_cur(vc);
1633 return;
1634 case '(':
1635 vc->vc_state = ESsetG0;
1636 return;
1637 case ')':
1638 vc->vc_state = ESsetG1;
1639 return;
1640 case '#':
1641 vc->vc_state = EShash;
1642 return;
1643 case 'c':
1644 reset_terminal(vc, 1);
1645 return;
1646 case '>': /* Numeric keypad */
1647 clr_kbd(vc, kbdapplic);
1648 return;
1649 case '=': /* Appl. keypad */
1650 set_kbd(vc, kbdapplic);
1651 return;
1652 }
1653 return;
1654 case ESnonstd:
1655 if (c=='P') { /* palette escape sequence */
1656 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1657 vc->vc_par[vc->vc_npar] = 0;
1658 vc->vc_npar = 0;
1659 vc->vc_state = ESpalette;
1660 return;
1661 } else if (c=='R') { /* reset palette */
1662 reset_palette(vc);
1663 vc->vc_state = ESnormal;
1664 } else
1665 vc->vc_state = ESnormal;
1666 return;
1667 case ESpalette:
1668 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1669 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1670 if (vc->vc_npar == 7) {
1671 int i = vc->vc_par[0] * 3, j = 1;
1672 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1673 vc->vc_palette[i++] += vc->vc_par[j++];
1674 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1675 vc->vc_palette[i++] += vc->vc_par[j++];
1676 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1677 vc->vc_palette[i] += vc->vc_par[j];
1678 set_palette(vc);
1679 vc->vc_state = ESnormal;
1680 }
1681 } else
1682 vc->vc_state = ESnormal;
1683 return;
1684 case ESsquare:
1685 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1686 vc->vc_par[vc->vc_npar] = 0;
1687 vc->vc_npar = 0;
1688 vc->vc_state = ESgetpars;
1689 if (c == '[') { /* Function key */
1690 vc->vc_state=ESfunckey;
1691 return;
1692 }
1693 vc->vc_ques = (c == '?');
1694 if (vc->vc_ques)
1695 return;
1696 case ESgetpars:
1697 if (c == ';' && vc->vc_npar < NPAR - 1) {
1698 vc->vc_npar++;
1699 return;
1700 } else if (c>='0' && c<='9') {
1701 vc->vc_par[vc->vc_npar] *= 10;
1702 vc->vc_par[vc->vc_npar] += c - '0';
1703 return;
1704 } else
1705 vc->vc_state = ESgotpars;
1706 case ESgotpars:
1707 vc->vc_state = ESnormal;
1708 switch(c) {
1709 case 'h':
1710 set_mode(vc, 1);
1711 return;
1712 case 'l':
1713 set_mode(vc, 0);
1714 return;
1715 case 'c':
1716 if (vc->vc_ques) {
1717 if (vc->vc_par[0])
1718 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1719 else
1720 vc->vc_cursor_type = CUR_DEFAULT;
1721 return;
1722 }
1723 break;
1724 case 'm':
1725 if (vc->vc_ques) {
1726 clear_selection();
1727 if (vc->vc_par[0])
1728 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1729 else
1730 vc->vc_complement_mask = vc->vc_s_complement_mask;
1731 return;
1732 }
1733 break;
1734 case 'n':
1735 if (!vc->vc_ques) {
1736 if (vc->vc_par[0] == 5)
1737 status_report(tty);
1738 else if (vc->vc_par[0] == 6)
1739 cursor_report(vc, tty);
1740 }
1741 return;
1742 }
1743 if (vc->vc_ques) {
1744 vc->vc_ques = 0;
1745 return;
1746 }
1747 switch(c) {
1748 case 'G': case '`':
1749 if (vc->vc_par[0])
1750 vc->vc_par[0]--;
1751 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1752 return;
1753 case 'A':
1754 if (!vc->vc_par[0])
1755 vc->vc_par[0]++;
1756 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1757 return;
1758 case 'B': case 'e':
1759 if (!vc->vc_par[0])
1760 vc->vc_par[0]++;
1761 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1762 return;
1763 case 'C': case 'a':
1764 if (!vc->vc_par[0])
1765 vc->vc_par[0]++;
1766 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1767 return;
1768 case 'D':
1769 if (!vc->vc_par[0])
1770 vc->vc_par[0]++;
1771 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1772 return;
1773 case 'E':
1774 if (!vc->vc_par[0])
1775 vc->vc_par[0]++;
1776 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1777 return;
1778 case 'F':
1779 if (!vc->vc_par[0])
1780 vc->vc_par[0]++;
1781 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1782 return;
1783 case 'd':
1784 if (vc->vc_par[0])
1785 vc->vc_par[0]--;
1786 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1787 return;
1788 case 'H': case 'f':
1789 if (vc->vc_par[0])
1790 vc->vc_par[0]--;
1791 if (vc->vc_par[1])
1792 vc->vc_par[1]--;
1793 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1794 return;
1795 case 'J':
1796 csi_J(vc, vc->vc_par[0]);
1797 return;
1798 case 'K':
1799 csi_K(vc, vc->vc_par[0]);
1800 return;
1801 case 'L':
1802 csi_L(vc, vc->vc_par[0]);
1803 return;
1804 case 'M':
1805 csi_M(vc, vc->vc_par[0]);
1806 return;
1807 case 'P':
1808 csi_P(vc, vc->vc_par[0]);
1809 return;
1810 case 'c':
1811 if (!vc->vc_par[0])
1812 respond_ID(tty);
1813 return;
1814 case 'g':
1815 if (!vc->vc_par[0])
1816 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1817 else if (vc->vc_par[0] == 3) {
1818 vc->vc_tab_stop[0] =
1819 vc->vc_tab_stop[1] =
1820 vc->vc_tab_stop[2] =
1821 vc->vc_tab_stop[3] =
1822 vc->vc_tab_stop[4] = 0;
1823 }
1824 return;
1825 case 'm':
1826 csi_m(vc);
1827 return;
1828 case 'q': /* DECLL - but only 3 leds */
1829 /* map 0,1,2,3 to 0,1,2,4 */
1830 if (vc->vc_par[0] < 4)
1831 setledstate(kbd_table + vc->vc_num,
1832 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1833 return;
1834 case 'r':
1835 if (!vc->vc_par[0])
1836 vc->vc_par[0]++;
1837 if (!vc->vc_par[1])
1838 vc->vc_par[1] = vc->vc_rows;
1839 /* Minimum allowed region is 2 lines */
1840 if (vc->vc_par[0] < vc->vc_par[1] &&
1841 vc->vc_par[1] <= vc->vc_rows) {
1842 vc->vc_top = vc->vc_par[0] - 1;
1843 vc->vc_bottom = vc->vc_par[1];
1844 gotoxay(vc, 0, 0);
1845 }
1846 return;
1847 case 's':
1848 save_cur(vc);
1849 return;
1850 case 'u':
1851 restore_cur(vc);
1852 return;
1853 case 'X':
1854 csi_X(vc, vc->vc_par[0]);
1855 return;
1856 case '@':
1857 csi_at(vc, vc->vc_par[0]);
1858 return;
1859 case ']': /* setterm functions */
1860 setterm_command(vc);
1861 return;
1862 }
1863 return;
1864 case ESpercent:
1865 vc->vc_state = ESnormal;
1866 switch (c) {
1867 case '@': /* defined in ISO 2022 */
1868 vc->vc_utf = 0;
1869 return;
1870 case 'G': /* prelim official escape code */
1871 case '8': /* retained for compatibility */
1872 vc->vc_utf = 1;
1873 return;
1874 }
1875 return;
1876 case ESfunckey:
1877 vc->vc_state = ESnormal;
1878 return;
1879 case EShash:
1880 vc->vc_state = ESnormal;
1881 if (c == '8') {
1882 /* DEC screen alignment test. kludge :-) */
1883 vc->vc_video_erase_char =
1884 (vc->vc_video_erase_char & 0xff00) | 'E';
1885 csi_J(vc, 2);
1886 vc->vc_video_erase_char =
1887 (vc->vc_video_erase_char & 0xff00) | ' ';
1888 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1889 }
1890 return;
1891 case ESsetG0:
1892 if (c == '0')
1893 vc->vc_G0_charset = GRAF_MAP;
1894 else if (c == 'B')
1895 vc->vc_G0_charset = LAT1_MAP;
1896 else if (c == 'U')
1897 vc->vc_G0_charset = IBMPC_MAP;
1898 else if (c == 'K')
1899 vc->vc_G0_charset = USER_MAP;
1900 if (vc->vc_charset == 0)
1901 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1902 vc->vc_state = ESnormal;
1903 return;
1904 case ESsetG1:
1905 if (c == '0')
1906 vc->vc_G1_charset = GRAF_MAP;
1907 else if (c == 'B')
1908 vc->vc_G1_charset = LAT1_MAP;
1909 else if (c == 'U')
1910 vc->vc_G1_charset = IBMPC_MAP;
1911 else if (c == 'K')
1912 vc->vc_G1_charset = USER_MAP;
1913 if (vc->vc_charset == 1)
1914 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1915 vc->vc_state = ESnormal;
1916 return;
1917 default:
1918 vc->vc_state = ESnormal;
1919 }
1920}
1921
1922/* This is a temporary buffer used to prepare a tty console write
1923 * so that we can easily avoid touching user space while holding the
1924 * console spinlock. It is allocated in con_init and is shared by
1925 * this code and the vc_screen read/write tty calls.
1926 *
1927 * We have to allocate this statically in the kernel data section
1928 * since console_init (and thus con_init) are called before any
1929 * kernel memory allocation is available.
1930 */
1931char con_buf[CON_BUF_SIZE];
1932DECLARE_MUTEX(con_buf_sem);
1933
1934/* acquires console_sem */
1935static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1936{
1937#ifdef VT_BUF_VRAM_ONLY
1938#define FLUSH do { } while(0);
1939#else
1940#define FLUSH if (draw_x >= 0) { \
1941 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1942 draw_x = -1; \
1943 }
1944#endif
1945
1946 int c, tc, ok, n = 0, draw_x = -1;
1947 unsigned int currcons;
1948 unsigned long draw_from = 0, draw_to = 0;
1949 struct vc_data *vc;
1950 u16 himask, charmask;
1951 const unsigned char *orig_buf = NULL;
1952 int orig_count;
1953
1954 if (in_interrupt())
1955 return count;
1956
1957 might_sleep();
1958
1959 acquire_console_sem();
1960 vc = tty->driver_data;
1961 if (vc == NULL) {
1962 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1963 release_console_sem();
1964 return 0;
1965 }
1966
1967 currcons = vc->vc_num;
1968 if (!vc_cons_allocated(currcons)) {
1969 /* could this happen? */
1970 static int error = 0;
1971 if (!error) {
1972 error = 1;
1973 printk("con_write: tty %d not allocated\n", currcons+1);
1974 }
1975 release_console_sem();
1976 return 0;
1977 }
1978 release_console_sem();
1979
1980 orig_buf = buf;
1981 orig_count = count;
1982
1983 /* At this point 'buf' is guaranteed to be a kernel buffer
1984 * and therefore no access to userspace (and therefore sleeping)
1985 * will be needed. The con_buf_sem serializes all tty based
1986 * console rendering and vcs write/read operations. We hold
1987 * the console spinlock during the entire write.
1988 */
1989
1990 acquire_console_sem();
1991
1992 vc = tty->driver_data;
1993 if (vc == NULL) {
1994 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1995 release_console_sem();
1996 goto out;
1997 }
1998
1999 himask = vc->vc_hi_font_mask;
2000 charmask = himask ? 0x1ff : 0xff;
2001
2002 /* undraw cursor first */
2003 if (IS_FG(vc))
2004 hide_cursor(vc);
2005
2006 while (!tty->stopped && count) {
2007 int orig = *buf;
2008 c = orig;
2009 buf++;
2010 n++;
2011 count--;
2012
2013 /* Do no translation at all in control states */
2014 if (vc->vc_state != ESnormal) {
2015 tc = c;
d4328b40 2016 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
1da177e4 2017 /* Combine UTF-8 into Unicode */
d4328b40
AT		 2018 /* Malformed sequences as sequences of replacement glyphs */
2019rescan_last_byte:
1da177e4 2020 if(c > 0x7f) {
d4328b40
AT		 2021 if (vc->vc_utf_count) {
2022 if ((c & 0xc0) == 0x80) {
2023 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2024 if (--vc->vc_utf_count) {
2025 vc->vc_npar++;
2026 continue;
2027 }
2028 tc = c = vc->vc_utf_char;
2029 } else
2030 goto replacement_glyph;
1da177e4 2031 } else {
d4328b40 2032 vc->vc_npar = 0;
1da177e4
LT		 2033 if ((c & 0xe0) == 0xc0) {
2034 vc->vc_utf_count = 1;
2035 vc->vc_utf_char = (c & 0x1f);
2036 } else if ((c & 0xf0) == 0xe0) {
2037 vc->vc_utf_count = 2;
2038 vc->vc_utf_char = (c & 0x0f);
2039 } else if ((c & 0xf8) == 0xf0) {
2040 vc->vc_utf_count = 3;
2041 vc->vc_utf_char = (c & 0x07);
2042 } else if ((c & 0xfc) == 0xf8) {
2043 vc->vc_utf_count = 4;
2044 vc->vc_utf_char = (c & 0x03);
2045 } else if ((c & 0xfe) == 0xfc) {
2046 vc->vc_utf_count = 5;
2047 vc->vc_utf_char = (c & 0x01);
2048 } else
d4328b40 2049 goto replacement_glyph;
1da177e4
LT		 2050 continue;
2051 }
2052 } else {
d4328b40
AT		 2053 if (vc->vc_utf_count)
2054 goto replacement_glyph;
1da177e4 2055 tc = c;
1da177e4 2056 }
d4328b40 2057 } else { /* no utf or alternate charset mode */
1da177e4
LT		 2058 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2059 }
2060
2061 /* If the original code was a control character we
2062 * only allow a glyph to be displayed if the code is
2063 * not normally used (such as for cursor movement) or
2064 * if the disp_ctrl mode has been explicitly enabled.
2065 * Certain characters (as given by the CTRL_ALWAYS
2066 * bitmap) are always displayed as control characters,
2067 * as the console would be pretty useless without
2068 * them; to display an arbitrary font position use the
2069 * direct-to-font zone in UTF-8 mode.
2070 */
2071 ok = tc && (c >= 32 ||
d4328b40
AT		 2072 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2073 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2074 && (c != 127 || vc->vc_disp_ctrl)
2075 && (c != 128+27);
2076
2077 if (vc->vc_state == ESnormal && ok) {
2078 /* Now try to find out how to display it */
2079 tc = conv_uni_to_pc(vc, tc);
d4328b40
AT		 2080 if (tc & ~charmask) {
2081 if ( tc == -4 ) {
1da177e4
LT		 2082 /* If we got -4 (not found) then see if we have
2083 defined a replacement character (U+FFFD) */
d4328b40
AT		 2084replacement_glyph:
2085 tc = conv_uni_to_pc(vc, 0xfffd);
2086 if (!(tc & ~charmask))
2087 goto display_glyph;
2088 } else if ( tc != -3 )
2089 continue; /* nothing to display */
2090 /* no hash table or no replacement --
2091 * hope for the best */
2092 if ( c & ~charmask )
2093 tc = '?';
2094 else
2095 tc = c;
2096 }
1da177e4 2097
d4328b40 2098display_glyph:
1da177e4
LT		 2099 if (vc->vc_need_wrap || vc->vc_decim)
2100 FLUSH
2101 if (vc->vc_need_wrap) {
2102 cr(vc);
2103 lf(vc);
2104 }
2105 if (vc->vc_decim)
2106 insert_char(vc, 1);
2107 scr_writew(himask ?
2108 ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2109 (vc->vc_attr << 8) + tc,
2110 (u16 *) vc->vc_pos);
2111 if (DO_UPDATE(vc) && draw_x < 0) {
2112 draw_x = vc->vc_x;
2113 draw_from = vc->vc_pos;
2114 }
2115 if (vc->vc_x == vc->vc_cols - 1) {
2116 vc->vc_need_wrap = vc->vc_decawm;
2117 draw_to = vc->vc_pos + 2;
2118 } else {
2119 vc->vc_x++;
2120 draw_to = (vc->vc_pos += 2);
2121 }
d4328b40
AT		 2122 if (vc->vc_utf_count) {
2123 if (vc->vc_npar) {
2124 vc->vc_npar--;
2125 goto display_glyph;
2126 }
2127 vc->vc_utf_count = 0;
2128 c = orig;
2129 goto rescan_last_byte;
2130 }
1da177e4
LT		 2131 continue;
2132 }
2133 FLUSH
2134 do_con_trol(tty, vc, orig);
2135 }
2136 FLUSH
2137 console_conditional_schedule();
2138 release_console_sem();
2139
2140out:
2141 return n;
2142#undef FLUSH
2143}
2144
2145/*
2146 * This is the console switching callback.
2147 *
2148 * Doing console switching in a process context allows
2149 * us to do the switches asynchronously (needed when we want
2150 * to switch due to a keyboard interrupt). Synchronization
2151 * with other console code and prevention of re-entrancy is
2152 * ensured with console_sem.
2153 */
65f27f38 2154static void console_callback(struct work_struct *ignored)
1da177e4
LT		 2155{
2156 acquire_console_sem();
2157
2158 if (want_console >= 0) {
2159 if (want_console != fg_console &&
2160 vc_cons_allocated(want_console)) {
2161 hide_cursor(vc_cons[fg_console].d);
2162 change_console(vc_cons[want_console].d);
2163 /* we only changed when the console had already
2164 been allocated - a new console is not created
2165 in an interrupt routine */
2166 }
2167 want_console = -1;
2168 }
2169 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2170 do_poke_blanked_console = 0;
2171 poke_blanked_console();
2172 }
2173 if (scrollback_delta) {
2174 struct vc_data *vc = vc_cons[fg_console].d;
2175 clear_selection();
2176 if (vc->vc_mode == KD_TEXT)
2177 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2178 scrollback_delta = 0;
2179 }
2180 if (blank_timer_expired) {
2181 do_blank_screen(0);
2182 blank_timer_expired = 0;
2183 }
2184
2185 release_console_sem();
2186}
2187
2188void set_console(int nr)
2189{
2190 want_console = nr;
2191 schedule_console_callback();
2192}
2193
2194struct tty_driver *console_driver;
2195
2196#ifdef CONFIG_VT_CONSOLE
2197
2198/*
2199 * Console on virtual terminal
2200 *
2201 * The console must be locked when we get here.
2202 */
2203
2204static void vt_console_print(struct console *co, const char *b, unsigned count)
2205{
2206 struct vc_data *vc = vc_cons[fg_console].d;
2207 unsigned char c;
2208 static unsigned long printing;
2209 const ushort *start;
2210 ushort cnt = 0;
2211 ushort myx;
2212
2213 /* console busy or not yet initialized */
2214 if (!printable || test_and_set_bit(0, &printing))
2215 return;
2216
2217 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2218 vc = vc_cons[kmsg_redirect - 1].d;
2219
2220 /* read `x' only after setting currcons properly (otherwise
2221 the `x' macro will read the x of the foreground console). */
2222 myx = vc->vc_x;
2223
2224 if (!vc_cons_allocated(fg_console)) {
2225 /* impossible */
2226 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2227 goto quit;
2228 }
2229
2230 if (vc->vc_mode != KD_TEXT)
2231 goto quit;
2232
2233 /* undraw cursor first */
2234 if (IS_FG(vc))
2235 hide_cursor(vc);
2236
2237 start = (ushort *)vc->vc_pos;
2238
2239 /* Contrived structure to try to emulate original need_wrap behaviour
2240 * Problems caused when we have need_wrap set on '\n' character */
2241 while (count--) {
2242 c = *b++;
2243 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2244 if (cnt > 0) {
2245 if (CON_IS_VISIBLE(vc))
2246 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2247 vc->vc_x += cnt;
2248 if (vc->vc_need_wrap)
2249 vc->vc_x--;
2250 cnt = 0;
2251 }
2252 if (c == 8) { /* backspace */
2253 bs(vc);
2254 start = (ushort *)vc->vc_pos;
2255 myx = vc->vc_x;
2256 continue;
2257 }
2258 if (c != 13)
2259 lf(vc);
2260 cr(vc);
2261 start = (ushort *)vc->vc_pos;
2262 myx = vc->vc_x;
2263 if (c == 10 || c == 13)
2264 continue;
2265 }
2266 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2267 cnt++;
2268 if (myx == vc->vc_cols - 1) {
2269 vc->vc_need_wrap = 1;
2270 continue;
2271 }
2272 vc->vc_pos += 2;
2273 myx++;
2274 }
2275 if (cnt > 0) {
2276 if (CON_IS_VISIBLE(vc))
2277 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2278 vc->vc_x += cnt;
2279 if (vc->vc_x == vc->vc_cols) {
2280 vc->vc_x--;
2281 vc->vc_need_wrap = 1;
2282 }
2283 }
2284 set_cursor(vc);
2285
2286quit:
2287 clear_bit(0, &printing);
2288}
2289
2290static struct tty_driver *vt_console_device(struct console *c, int *index)
2291{
2292 *index = c->index ? c->index-1 : fg_console;
2293 return console_driver;
2294}
2295
2296static struct console vt_console_driver = {
2297 .name = "tty",
2298 .write = vt_console_print,
2299 .device = vt_console_device,
2300 .unblank = unblank_screen,
2301 .flags = CON_PRINTBUFFER,
2302 .index = -1,
2303};
2304#endif
2305
2306/*
2307 * Handling of Linux-specific VC ioctls
2308 */
2309
2310/*
2311 * Generally a bit racy with respect to console_sem().
2312 *
2313 * There are some functions which don't need it.
2314 *
2315 * There are some functions which can sleep for arbitrary periods
2316 * (paste_selection) but we don't need the lock there anyway.
2317 *
2318 * set_selection has locking, and definitely needs it
2319 */
2320
2321int tioclinux(struct tty_struct *tty, unsigned long arg)
2322{
2323 char type, data;
2324 char __user *p = (char __user *)arg;
2325 int lines;
2326 int ret;
2327
2328 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2329 return -EINVAL;
2330 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2331 return -EPERM;
2332 if (get_user(type, p))
2333 return -EFAULT;
2334 ret = 0;
2335 switch (type)
2336 {
2337 case TIOCL_SETSEL:
2338 acquire_console_sem();
2339 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2340 release_console_sem();
2341 break;
2342 case TIOCL_PASTESEL:
2343 ret = paste_selection(tty);
2344 break;
2345 case TIOCL_UNBLANKSCREEN:
2d237c63 2346 acquire_console_sem();
1da177e4 2347 unblank_screen();
2d237c63 2348 release_console_sem();
1da177e4
LT		 2349 break;
2350 case TIOCL_SELLOADLUT:
2351 ret = sel_loadlut(p);
2352 break;
2353 case TIOCL_GETSHIFTSTATE:
2354
2355 /*
2356 * Make it possible to react to Shift+Mousebutton.
2357 * Note that 'shift_state' is an undocumented
2358 * kernel-internal variable; programs not closely
2359 * related to the kernel should not use this.
2360 */
2361 data = shift_state;
2362 ret = __put_user(data, p);
2363 break;
2364 case TIOCL_GETMOUSEREPORTING:
2365 data = mouse_reporting();
2366 ret = __put_user(data, p);
2367 break;
2368 case TIOCL_SETVESABLANK:
403aac96 2369 ret = set_vesa_blanking(p);
1da177e4 2370 break;
0ca07731
RW		 2371 case TIOCL_GETKMSGREDIRECT:
2372 data = kmsg_redirect;
2373 ret = __put_user(data, p);
2374 break;
1da177e4
LT		 2375 case TIOCL_SETKMSGREDIRECT:
2376 if (!capable(CAP_SYS_ADMIN)) {
2377 ret = -EPERM;
2378 } else {
2379 if (get_user(data, p+1))
2380 ret = -EFAULT;
2381 else
2382 kmsg_redirect = data;
2383 }
2384 break;
2385 case TIOCL_GETFGCONSOLE:
2386 ret = fg_console;
2387 break;
2388 case TIOCL_SCROLLCONSOLE:
2389 if (get_user(lines, (s32 __user *)(p+4))) {
2390 ret = -EFAULT;
2391 } else {
2392 scrollfront(vc_cons[fg_console].d, lines);
2393 ret = 0;
2394 }
2395 break;
2396 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2397 acquire_console_sem();
1da177e4
LT		 2398 ignore_poke = 1;
2399 do_blank_screen(0);
2d237c63 2400 release_console_sem();
1da177e4
LT		 2401 break;
2402 case TIOCL_BLANKEDSCREEN:
2403 ret = console_blanked;
2404 break;
2405 default:
2406 ret = -EINVAL;
2407 break;
2408 }
2409 return ret;
2410}
2411
2412/*
2413 * /dev/ttyN handling
2414 */
2415
2416static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2417{
2418 int retval;
2419
2420 retval = do_con_write(tty, buf, count);
2421 con_flush_chars(tty);
2422
2423 return retval;
2424}
2425
2426static void con_put_char(struct tty_struct *tty, unsigned char ch)
2427{
2428 if (in_interrupt())
2429 return; /* n_r3964 calls put_char() from interrupt context */
2430 do_con_write(tty, &ch, 1);
2431}
2432
2433static int con_write_room(struct tty_struct *tty)
2434{
2435 if (tty->stopped)
2436 return 0;
2437 return 4096; /* No limit, really; we're not buffering */
2438}
2439
2440static int con_chars_in_buffer(struct tty_struct *tty)
2441{
2442 return 0; /* we're not buffering */
2443}
2444
2445/*
2446 * con_throttle and con_unthrottle are only used for
2447 * paste_selection(), which has to stuff in a large number of
2448 * characters...
2449 */
2450static void con_throttle(struct tty_struct *tty)
2451{
2452}
2453
2454static void con_unthrottle(struct tty_struct *tty)
2455{
2456 struct vc_data *vc = tty->driver_data;
2457
2458 wake_up_interruptible(&vc->paste_wait);
2459}
2460
2461/*
2462 * Turn the Scroll-Lock LED on when the tty is stopped
2463 */
2464static void con_stop(struct tty_struct *tty)
2465{
2466 int console_num;
2467 if (!tty)
2468 return;
2469 console_num = tty->index;
2470 if (!vc_cons_allocated(console_num))
2471 return;
2472 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2473 set_leds();
2474}
2475
2476/*
2477 * Turn the Scroll-Lock LED off when the console is started
2478 */
2479static void con_start(struct tty_struct *tty)
2480{
2481 int console_num;
2482 if (!tty)
2483 return;
2484 console_num = tty->index;
2485 if (!vc_cons_allocated(console_num))
2486 return;
2487 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2488 set_leds();
2489}
2490
2491static void con_flush_chars(struct tty_struct *tty)
2492{
2493 struct vc_data *vc;
2494
2495 if (in_interrupt()) /* from flush_to_ldisc */
2496 return;
2497
2498 /* if we race with con_close(), vt may be null */
2499 acquire_console_sem();
2500 vc = tty->driver_data;
2501 if (vc)
2502 set_cursor(vc);
2503 release_console_sem();
2504}
2505
2506/*
2507 * Allocate the console screen memory.
2508 */
2509static int con_open(struct tty_struct *tty, struct file *filp)
2510{
2511 unsigned int currcons = tty->index;
2512 int ret = 0;
2513
2514 acquire_console_sem();
f786648b 2515 if (tty->driver_data == NULL) {
1da177e4
LT		 2516 ret = vc_allocate(currcons);
2517 if (ret == 0) {
2518 struct vc_data *vc = vc_cons[currcons].d;
2519 tty->driver_data = vc;
2520 vc->vc_tty = tty;
2521
2522 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2523 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2524 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2525 }
2526 release_console_sem();
d09d7ddf 2527 vcs_make_sysfs(tty);
1da177e4
LT		 2528 return ret;
2529 }
2530 }
2531 release_console_sem();
2532 return ret;
2533}
2534
2535/*
70522e12 2536 * We take tty_mutex in here to prevent another thread from coming in via init_dev
1da177e4
LT		 2537 * and taking a ref against the tty while we're in the process of forgetting
2538 * about it and cleaning things up.
2539 *
d09d7ddf 2540 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
1da177e4
LT		 2541 */
2542static void con_close(struct tty_struct *tty, struct file *filp)
2543{
70522e12 2544 mutex_lock(&tty_mutex);
1da177e4
LT		 2545 acquire_console_sem();
2546 if (tty && tty->count == 1) {
2547 struct vc_data *vc = tty->driver_data;
2548
2549 if (vc)
2550 vc->vc_tty = NULL;
2551 tty->driver_data = NULL;
2552 release_console_sem();
d09d7ddf 2553 vcs_remove_sysfs(tty);
70522e12 2554 mutex_unlock(&tty_mutex);
1da177e4 2555 /*
70522e12 2556 * tty_mutex is released, but we still hold BKL, so there is
1da177e4
LT		 2557 * still exclusion against init_dev()
2558 */
2559 return;
2560 }
2561 release_console_sem();
70522e12 2562 mutex_unlock(&tty_mutex);
1da177e4
LT		 2563}
2564
2565static void vc_init(struct vc_data *vc, unsigned int rows,
2566 unsigned int cols, int do_clear)
2567{
2568 int j, k ;
2569
2570 vc->vc_cols = cols;
2571 vc->vc_rows = rows;
2572 vc->vc_size_row = cols << 1;
2573 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2574
2575 set_origin(vc);
2576 vc->vc_pos = vc->vc_origin;
2577 reset_vc(vc);
2578 for (j=k=0; j<16; j++) {
2579 vc->vc_palette[k++] = default_red[j] ;
2580 vc->vc_palette[k++] = default_grn[j] ;
2581 vc->vc_palette[k++] = default_blu[j] ;
2582 }
2583 vc->vc_def_color = 0x07; /* white */
2584 vc->vc_ulcolor = 0x0f; /* bold white */
2585 vc->vc_halfcolor = 0x08; /* grey */
2586 init_waitqueue_head(&vc->paste_wait);
2587 reset_terminal(vc, do_clear);
2588}
2589
2590/*
2591 * This routine initializes console interrupts, and does nothing
2592 * else. If you want the screen to clear, call tty_write with
2593 * the appropriate escape-sequence.
2594 */
2595
2596static int __init con_init(void)
2597{
2598 const char *display_desc = NULL;
2599 struct vc_data *vc;
3e795de7 2600 unsigned int currcons = 0, i;
1da177e4
LT		 2601
2602 acquire_console_sem();
2603
2604 if (conswitchp)
2605 display_desc = conswitchp->con_startup();
2606 if (!display_desc) {
2607 fg_console = 0;
2608 release_console_sem();
2609 return 0;
2610 }
2611
3e795de7
AD		 2612 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2613 struct con_driver *con_driver = &registered_con_driver[i];
2614
2615 if (con_driver->con == NULL) {
2616 con_driver->con = conswitchp;
2617 con_driver->desc = display_desc;
2618 con_driver->flag = CON_DRIVER_FLAG_INIT;
2619 con_driver->first = 0;
2620 con_driver->last = MAX_NR_CONSOLES - 1;
2621 break;
2622 }
2623 }
2624
2625 for (i = 0; i < MAX_NR_CONSOLES; i++)
2626 con_driver_map[i] = conswitchp;
2627
1da177e4
LT		 2628 if (blankinterval) {
2629 blank_state = blank_normal_wait;
2630 mod_timer(&console_timer, jiffies + blankinterval);
2631 }
2632
2633 /*
2634 * kmalloc is not running yet - we use the bootmem allocator.
2635 */
2636 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2637 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
7f1f86a0 2638 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 2639 visual_init(vc, currcons, 1);
2640 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2641 vc->vc_kmalloced = 0;
2642 vc_init(vc, vc->vc_rows, vc->vc_cols,
2643 currcons || !vc->vc_sw->con_save_screen);
2644 }
2645 currcons = fg_console = 0;
2646 master_display_fg = vc = vc_cons[currcons].d;
2647 set_origin(vc);
2648 save_screen(vc);
2649 gotoxy(vc, vc->vc_x, vc->vc_y);
2650 csi_J(vc, 0);
2651 update_screen(vc);
2652 printk("Console: %s %s %dx%d",
2653 vc->vc_can_do_color ? "colour" : "mono",
2654 display_desc, vc->vc_cols, vc->vc_rows);
2655 printable = 1;
2656 printk("\n");
2657
2658 release_console_sem();
2659
2660#ifdef CONFIG_VT_CONSOLE
2661 register_console(&vt_console_driver);
2662#endif
2663 return 0;
2664}
2665console_initcall(con_init);
2666
b68e31d0 2667static const struct tty_operations con_ops = {
1da177e4
LT		 2668 .open = con_open,
2669 .close = con_close,
2670 .write = con_write,
2671 .write_room = con_write_room,
2672 .put_char = con_put_char,
2673 .flush_chars = con_flush_chars,
2674 .chars_in_buffer = con_chars_in_buffer,
2675 .ioctl = vt_ioctl,
2676 .stop = con_stop,
2677 .start = con_start,
2678 .throttle = con_throttle,
2679 .unthrottle = con_unthrottle,
2680};
2681
2682int __init vty_init(void)
2683{
2684 vcs_init();
2685
2686 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2687 if (!console_driver)
2688 panic("Couldn't allocate console driver\n");
2689 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2690 console_driver->name = "tty";
2691 console_driver->name_base = 1;
2692 console_driver->major = TTY_MAJOR;
2693 console_driver->minor_start = 1;
2694 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2695 console_driver->init_termios = tty_std_termios;
2696 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2697 tty_set_operations(console_driver, &con_ops);
2698 if (tty_register_driver(console_driver))
2699 panic("Couldn't register console driver\n");
2700
2701 kbd_init();
2702 console_map_init();
2703#ifdef CONFIG_PROM_CONSOLE
2704 prom_con_init();
2705#endif
2706#ifdef CONFIG_MDA_CONSOLE
2707 mda_console_init();
2708#endif
2709 return 0;
2710}
2711
2712#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 2713#include <linux/device.h>
2714
2715static struct class *vtconsole_class;
2716
3e795de7
AD		 2717static int bind_con_driver(const struct consw *csw, int first, int last,
2718 int deflt)
1da177e4 2719{
3e795de7
AD		 2720 struct module *owner = csw->owner;
2721 const char *desc = NULL;
2722 struct con_driver *con_driver;
2723 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2724
1da177e4
LT		 2725 if (!try_module_get(owner))
2726 return -ENODEV;
2727
1c8ce271 2728 acquire_console_sem();
1c8ce271 2729
3e795de7
AD		 2730 /* check if driver is registered */
2731 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2732 con_driver = &registered_con_driver[i];
2733
2734 if (con_driver->con == csw) {
2735 desc = con_driver->desc;
2736 retval = 0;
2737 break;
2738 }
2739 }
2740
2741 if (retval)
2742 goto err;
2743
2744 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2745 csw->con_startup();
2746 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 2747 }
1c8ce271 2748
1da177e4
LT		 2749 if (deflt) {
2750 if (conswitchp)
2751 module_put(conswitchp->owner);
1c8ce271 2752
1da177e4
LT		 2753 __module_get(owner);
2754 conswitchp = csw;
2755 }
2756
3e795de7
AD		 2757 first = max(first, con_driver->first);
2758 last = min(last, con_driver->last);
2759
1da177e4
LT		 2760 for (i = first; i <= last; i++) {
2761 int old_was_color;
2762 struct vc_data *vc = vc_cons[i].d;
2763
2764 if (con_driver_map[i])
2765 module_put(con_driver_map[i]->owner);
2766 __module_get(owner);
2767 con_driver_map[i] = csw;
2768
2769 if (!vc || !vc->vc_sw)
2770 continue;
2771
2772 j = i;
1c8ce271 2773
4ee1acce
DH		 2774 if (CON_IS_VISIBLE(vc)) {
2775 k = i;
1da177e4 2776 save_screen(vc);
4ee1acce
DH		 2777 }
2778
1da177e4
LT		 2779 old_was_color = vc->vc_can_do_color;
2780 vc->vc_sw->con_deinit(vc);
2781 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 2782 visual_init(vc, i, 0);
1c8ce271 2783 set_origin(vc);
1da177e4
LT		 2784 update_attr(vc);
2785
2786 /* If the console changed between mono <-> color, then
2787 * the attributes in the screenbuf will be wrong. The
2788 * following resets all attributes to something sane.
2789 */
2790 if (old_was_color != vc->vc_can_do_color)
2791 clear_buffer_attributes(vc);
1da177e4 2792 }
4ee1acce 2793
1da177e4
LT		 2794 printk("Console: switching ");
2795 if (!deflt)
2796 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 2797 if (j >= 0) {
2798 struct vc_data *vc = vc_cons[j].d;
2799
1da177e4 2800 printk("to %s %s %dx%d\n",
4ee1acce
DH		 2801 vc->vc_can_do_color ? "colour" : "mono",
2802 desc, vc->vc_cols, vc->vc_rows);
2803
2804 if (k >= 0) {
2805 vc = vc_cons[k].d;
2806 update_screen(vc);
2807 }
2808 } else
1da177e4
LT		 2809 printk("to %s\n", desc);
2810
3e795de7
AD		 2811 retval = 0;
2812err:
1da177e4 2813 release_console_sem();
1da177e4 2814 module_put(owner);
3e795de7
AD		 2815 return retval;
2816};
1da177e4 2817
13ae6645
AD		 2818#ifdef CONFIG_VT_HW_CONSOLE_BINDING
2819static int con_is_graphics(const struct consw *csw, int first, int last)
2820{
2821 int i, retval = 0;
2822
2823 for (i = first; i <= last; i++) {
2824 struct vc_data *vc = vc_cons[i].d;
2825
2826 if (vc && vc->vc_mode == KD_GRAPHICS) {
2827 retval = 1;
2828 break;
2829 }
2830 }
2831
2832 return retval;
2833}
2834
3e795de7
AD		 2835static int unbind_con_driver(const struct consw *csw, int first, int last,
2836 int deflt)
1da177e4 2837{
3e795de7
AD		 2838 struct module *owner = csw->owner;
2839 const struct consw *defcsw = NULL;
2840 struct con_driver *con_driver = NULL, *con_back = NULL;
2841 int i, retval = -ENODEV;
1da177e4 2842
3e795de7
AD		 2843 if (!try_module_get(owner))
2844 return -ENODEV;
2845
2846 acquire_console_sem();
2847
2848 /* check if driver is registered and if it is unbindable */
2849 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2850 con_driver = &registered_con_driver[i];
2851
2852 if (con_driver->con == csw &&
6db4063c 2853 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 2854 retval = 0;
2855 break;
2856 }
2857 }
2858
2859 if (retval) {
2860 release_console_sem();
2861 goto err;
2862 }
2863
6db4063c
AD		 2864 retval = -ENODEV;
2865
3e795de7
AD		 2866 /* check if backup driver exists */
2867 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2868 con_back = &registered_con_driver[i];
2869
2870 if (con_back->con &&
6db4063c 2871 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 2872 defcsw = con_back->con;
2873 retval = 0;
2874 break;
2875 }
2876 }
2877
2878 if (retval) {
2879 release_console_sem();
2880 goto err;
2881 }
2882
2883 if (!con_is_bound(csw)) {
2884 release_console_sem();
2885 goto err;
2886 }
2887
2888 first = max(first, con_driver->first);
2889 last = min(last, con_driver->last);
2890
2891 for (i = first; i <= last; i++) {
1da177e4
LT		 2892 if (con_driver_map[i] == csw) {
2893 module_put(csw->owner);
2894 con_driver_map[i] = NULL;
2895 }
3e795de7
AD		 2896 }
2897
2898 if (!con_is_bound(defcsw)) {
6db4063c
AD		 2899 const struct consw *defconsw = conswitchp;
2900
3e795de7
AD		 2901 defcsw->con_startup();
2902 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 2903 /*
2904 * vgacon may change the default driver to point
2905 * to dummycon, we restore it here...
2906 */
2907 conswitchp = defconsw;
3e795de7
AD		 2908 }
2909
2910 if (!con_is_bound(csw))
2911 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2912
2913 release_console_sem();
6db4063c
AD		 2914 /* ignore return value, binding should not fail */
2915 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 2916err:
2917 module_put(owner);
2918 return retval;
2919
2920}
2921
6db4063c
AD		 2922static int vt_bind(struct con_driver *con)
2923{
2924 const struct consw *defcsw = NULL, *csw = NULL;
2925 int i, more = 1, first = -1, last = -1, deflt = 0;
2926
2927 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2928 con_is_graphics(con->con, con->first, con->last))
2929 goto err;
2930
2931 csw = con->con;
2932
2933 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2934 struct con_driver *con = &registered_con_driver[i];
2935
2936 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
2937 defcsw = con->con;
2938 break;
2939 }
2940 }
2941
2942 if (!defcsw)
2943 goto err;
2944
2945 while (more) {
2946 more = 0;
2947
2948 for (i = con->first; i <= con->last; i++) {
2949 if (con_driver_map[i] == defcsw) {
2950 if (first == -1)
2951 first = i;
2952 last = i;
2953 more = 1;
2954 } else if (first != -1)
2955 break;
2956 }
2957
2958 if (first == 0 && last == MAX_NR_CONSOLES -1)
2959 deflt = 1;
2960
2961 if (first != -1)
2962 bind_con_driver(csw, first, last, deflt);
2963
2964 first = -1;
2965 last = -1;
2966 deflt = 0;
2967 }
2968
2969err:
2970 return 0;
2971}
2972
2973static int vt_unbind(struct con_driver *con)
2974{
2975 const struct consw *csw = NULL;
2976 int i, more = 1, first = -1, last = -1, deflt = 0;
2977
2978 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
2979 con_is_graphics(con->con, con->first, con->last))
2980 goto err;
2981
2982 csw = con->con;
2983
2984 while (more) {
2985 more = 0;
2986
2987 for (i = con->first; i <= con->last; i++) {
2988 if (con_driver_map[i] == csw) {
2989 if (first == -1)
2990 first = i;
2991 last = i;
2992 more = 1;
2993 } else if (first != -1)
2994 break;
2995 }
2996
2997 if (first == 0 && last == MAX_NR_CONSOLES -1)
2998 deflt = 1;
2999
3000 if (first != -1)
3001 unbind_con_driver(csw, first, last, deflt);
3002
3003 first = -1;
3004 last = -1;
3005 deflt = 0;
3006 }
3007
3008err:
3009 return 0;
3010}
13ae6645
AD		 3011#else
3012static inline int vt_bind(struct con_driver *con)
3013{
3014 return 0;
3015}
3016static inline int vt_unbind(struct con_driver *con)
3017{
3018 return 0;
3019}
3020#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3021
805952a8 3022static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3023 const char *buf, size_t count)
3024{
805952a8 3025 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3026 int bind = simple_strtoul(buf, NULL, 0);
3027
3028 if (bind)
3029 vt_bind(con);
3030 else
3031 vt_unbind(con);
3032
3033 return count;
3034}
3035
805952a8
GKH		 3036static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3037 char *buf)
6db4063c 3038{
805952a8 3039 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3040 int bind = con_is_bound(con->con);
3041
3042 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3043}
3044
805952a8
GKH		 3045static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3046 char *buf)
6db4063c 3047{
805952a8 3048 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3049
3050 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3051 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3052 con->desc);
3053
3054}
3055
805952a8 3056static struct device_attribute device_attrs[] = {
6db4063c
AD		 3057 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3058 __ATTR(name, S_IRUGO, show_name, NULL),
3059};
3060
805952a8 3061static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3062{
3063 int i;
928e964f 3064 int error = 0;
6db4063c 3065
928e964f 3066 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3067 dev_set_drvdata(con->dev, con);
3068 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3069 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3070 if (error)
3071 break;
3072 }
6db4063c 3073
928e964f
AD		 3074 if (error) {
3075 while (--i >= 0)
805952a8 3076 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3077 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3078 }
3079
3080 return error;
6db4063c
AD		 3081}
3082
805952a8 3083static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3084{
3085 int i;
3086
928e964f 3087 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3088 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3089 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3090 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3091 }
6db4063c
AD		 3092}
3093
3e795de7
AD		 3094/**
3095 * con_is_bound - checks if driver is bound to the console
3096 * @csw: console driver
3097 *
3098 * RETURNS: zero if unbound, nonzero if bound
3099 *
3100 * Drivers can call this and if zero, they should release
3101 * all resources allocated on con_startup()
3102 */
3103int con_is_bound(const struct consw *csw)
3104{
3105 int i, bound = 0;
3106
3107 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3108 if (con_driver_map[i] == csw) {
3109 bound = 1;
3110 break;
3111 }
3112 }
3113
3114 return bound;
3115}
3116EXPORT_SYMBOL(con_is_bound);
3117
3118/**
3119 * register_con_driver - register console driver to console layer
3120 * @csw: console driver
3121 * @first: the first console to take over, minimum value is 0
3122 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3123 *
3124 * DESCRIPTION: This function registers a console driver which can later
3125 * bind to a range of consoles specified by @first and @last. It will
3126 * also initialize the console driver by calling con_startup().
3127 */
3128int register_con_driver(const struct consw *csw, int first, int last)
3129{
3130 struct module *owner = csw->owner;
3131 struct con_driver *con_driver;
3132 const char *desc;
3133 int i, retval = 0;
3134
3135 if (!try_module_get(owner))
3136 return -ENODEV;
3137
3138 acquire_console_sem();
3139
3140 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3141 con_driver = &registered_con_driver[i];
3142
3143 /* already registered */
3144 if (con_driver->con == csw)
3145 retval = -EINVAL;
3146 }
3147
3148 if (retval)
3149 goto err;
3150
3151 desc = csw->con_startup();
3152
3153 if (!desc)
3154 goto err;
3155
3156 retval = -EINVAL;
3157
3158 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3159 con_driver = &registered_con_driver[i];
3160
3161 if (con_driver->con == NULL) {
3162 con_driver->con = csw;
3163 con_driver->desc = desc;
6db4063c
AD		 3164 con_driver->node = i;
3165 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3166 CON_DRIVER_FLAG_INIT;
3167 con_driver->first = first;
3168 con_driver->last = last;
3169 retval = 0;
3170 break;
3171 }
3172 }
3173
6db4063c
AD		 3174 if (retval)
3175 goto err;
3176
805952a8
GKH		 3177 con_driver->dev = device_create(vtconsole_class, NULL,
3178 MKDEV(0, con_driver->node),
3179 "vtcon%i", con_driver->node);
6db4063c 3180
805952a8
GKH		 3181 if (IS_ERR(con_driver->dev)) {
3182 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3183 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3184 PTR_ERR(con_driver->dev));
3185 con_driver->dev = NULL;
6db4063c 3186 } else {
805952a8 3187 vtconsole_init_device(con_driver);
6db4063c 3188 }
928e964f 3189
3e795de7
AD		 3190err:
3191 release_console_sem();
3192 module_put(owner);
3193 return retval;
3194}
3195EXPORT_SYMBOL(register_con_driver);
3196
3197/**
3198 * unregister_con_driver - unregister console driver from console layer
3199 * @csw: console driver
3200 *
3201 * DESCRIPTION: All drivers that registers to the console layer must
3202 * call this function upon exit, or if the console driver is in a state
3203 * where it won't be able to handle console services, such as the
3204 * framebuffer console without loaded framebuffer drivers.
3205 *
3206 * The driver must unbind first prior to unregistration.
3207 */
3208int unregister_con_driver(const struct consw *csw)
3209{
3210 int i, retval = -ENODEV;
3211
3212 acquire_console_sem();
3213
3214 /* cannot unregister a bound driver */
3215 if (con_is_bound(csw))
3216 goto err;
3217
3218 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3219 struct con_driver *con_driver = &registered_con_driver[i];
3220
3221 if (con_driver->con == csw &&
6db4063c 3222 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3223 vtconsole_deinit_device(con_driver);
3224 device_destroy(vtconsole_class,
3225 MKDEV(0, con_driver->node));
3e795de7
AD		 3226 con_driver->con = NULL;
3227 con_driver->desc = NULL;
805952a8 3228 con_driver->dev = NULL;
6db4063c 3229 con_driver->node = 0;
3e795de7
AD		 3230 con_driver->flag = 0;
3231 con_driver->first = 0;
3232 con_driver->last = 0;
3233 retval = 0;
3234 break;
3235 }
3236 }
3e795de7
AD		 3237err:
3238 release_console_sem();
3239 return retval;
3240}
3241EXPORT_SYMBOL(unregister_con_driver);
3242
3243/*
3244 * If we support more console drivers, this function is used
3245 * when a driver wants to take over some existing consoles
3246 * and become default driver for newly opened ones.
3247 *
3248 * take_over_console is basically a register followed by unbind
3249 */
3250int take_over_console(const struct consw *csw, int first, int last, int deflt)
3251{
3252 int err;
3253
3254 err = register_con_driver(csw, first, last);
3255
3256 if (!err)
6db4063c 3257 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3258
3259 return err;
3260}
3261
3262/*
3263 * give_up_console is a wrapper to unregister_con_driver. It will only
3264 * work if driver is fully unbound.
3265 */
3266void give_up_console(const struct consw *csw)
3267{
3268 unregister_con_driver(csw);
3269}
3270
6db4063c 3271static int __init vtconsole_class_init(void)
3e795de7 3272{
6db4063c 3273 int i;
3e795de7 3274
6db4063c
AD		 3275 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3276 if (IS_ERR(vtconsole_class)) {
3277 printk(KERN_WARNING "Unable to create vt console class; "
3278 "errno = %ld\n", PTR_ERR(vtconsole_class));
3279 vtconsole_class = NULL;
3280 }
3e795de7 3281
6db4063c 3282 /* Add system drivers to sysfs */
3e795de7
AD		 3283 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3284 struct con_driver *con = &registered_con_driver[i];
3285
805952a8
GKH		 3286 if (con->con && !con->dev) {
3287 con->dev = device_create(vtconsole_class, NULL,
3288 MKDEV(0, con->node),
3289 "vtcon%i", con->node);
6db4063c 3290
805952a8 3291 if (IS_ERR(con->dev)) {
6db4063c 3292 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3293 "device for %s; errno = %ld\n",
3294 con->desc, PTR_ERR(con->dev));
3295 con->dev = NULL;
6db4063c 3296 } else {
805952a8 3297 vtconsole_init_device(con);
6db4063c 3298 }
3e795de7 3299 }
3e795de7
AD		 3300 }
3301
3e795de7
AD		 3302 return 0;
3303}
6db4063c 3304postcore_initcall(vtconsole_class_init);
3e795de7 3305
1da177e4
LT		 3306#endif
3307
3308/*
3309 * Screen blanking
3310 */
3311
403aac96 3312static int set_vesa_blanking(char __user *p)
1da177e4 3313{
403aac96
YY		 3314 unsigned int mode;
3315
3316 if (get_user(mode, p + 1))
3317 return -EFAULT;
3318
3319 vesa_blank_mode = (mode < 4) ? mode : 0;
3320 return 0;
1da177e4
LT		 3321}
3322
1da177e4
LT		 3323void do_blank_screen(int entering_gfx)
3324{
3325 struct vc_data *vc = vc_cons[fg_console].d;
3326 int i;
3327
3328 WARN_CONSOLE_UNLOCKED();
3329
3330 if (console_blanked) {
3331 if (blank_state == blank_vesa_wait) {
3332 blank_state = blank_off;
d060a321 3333 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3334 }
3335 return;
3336 }
3337 if (blank_state != blank_normal_wait)
3338 return;
3339 blank_state = blank_off;
3340
3341 /* entering graphics mode? */
3342 if (entering_gfx) {
3343 hide_cursor(vc);
3344 save_screen(vc);
3345 vc->vc_sw->con_blank(vc, -1, 1);
3346 console_blanked = fg_console + 1;
3347 set_origin(vc);
3348 return;
3349 }
3350
3351 /* don't blank graphics */
3352 if (vc->vc_mode != KD_TEXT) {
3353 console_blanked = fg_console + 1;
3354 return;
3355 }
3356
3357 hide_cursor(vc);
3358 del_timer_sync(&console_timer);
3359 blank_timer_expired = 0;
3360
3361 save_screen(vc);
3362 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3363 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3364 console_blanked = fg_console + 1;
3365 if (i)
3366 set_origin(vc);
3367
3368 if (console_blank_hook && console_blank_hook(1))
3369 return;
3370
d060a321 3371 if (vesa_off_interval && vesa_blank_mode) {
030babac 3372 blank_state = blank_vesa_wait;
1da177e4
LT		 3373 mod_timer(&console_timer, jiffies + vesa_off_interval);
3374 }
1da177e4
LT		 3375}
3376EXPORT_SYMBOL(do_blank_screen);
3377
3378/*
3379 * Called by timer as well as from vt_console_driver
3380 */
3381void do_unblank_screen(int leaving_gfx)
3382{
3383 struct vc_data *vc;
3384
3385 /* This should now always be called from a "sane" (read: can schedule)
3386 * context for the sake of the low level drivers, except in the special
3387 * case of oops_in_progress
3388 */
3389 if (!oops_in_progress)
3390 might_sleep();
3391
3392 WARN_CONSOLE_UNLOCKED();
3393
3394 ignore_poke = 0;
3395 if (!console_blanked)
3396 return;
3397 if (!vc_cons_allocated(fg_console)) {
3398 /* impossible */
3399 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3400 return;
3401 }
3402 vc = vc_cons[fg_console].d;
3403 if (vc->vc_mode != KD_TEXT)
3404 return; /* but leave console_blanked != 0 */
3405
3406 if (blankinterval) {
3407 mod_timer(&console_timer, jiffies + blankinterval);
3408 blank_state = blank_normal_wait;
3409 }
3410
3411 console_blanked = 0;
3412 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3413 /* Low-level driver cannot restore -> do it ourselves */
3414 update_screen(vc);
3415 if (console_blank_hook)
3416 console_blank_hook(0);
3417 set_palette(vc);
3418 set_cursor(vc);
3419}
3420EXPORT_SYMBOL(do_unblank_screen);
3421
3422/*
3423 * This is called by the outside world to cause a forced unblank, mostly for
3424 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3425 * call it with 1 as an argument and so force a mode restore... that may kill
3426 * X or at least garbage the screen but would also make the Oops visible...
3427 */
3428void unblank_screen(void)
3429{
3430 do_unblank_screen(0);
3431}
3432
3433/*
70522e12 3434 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3435 * (console operations can still happen at irq time, but only from printk which
70522e12 3436 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3437 */
3438static void blank_screen_t(unsigned long dummy)
3439{
cc63b1e1
JB		 3440 if (unlikely(!keventd_up())) {
3441 mod_timer(&console_timer, jiffies + blankinterval);
3442 return;
3443 }
1da177e4
LT		 3444 blank_timer_expired = 1;
3445 schedule_work(&console_work);
3446}
3447
3448void poke_blanked_console(void)
3449{
3450 WARN_CONSOLE_UNLOCKED();
3451
3452 /* Add this so we quickly catch whoever might call us in a non
3453 * safe context. Nowadays, unblank_screen() isn't to be called in
3454 * atomic contexts and is allowed to schedule (with the special case
3455 * of oops_in_progress, but that isn't of any concern for this
3456 * function. --BenH.
3457 */
3458 might_sleep();
3459
3460 /* This isn't perfectly race free, but a race here would be mostly harmless,
3461 * at worse, we'll do a spurrious blank and it's unlikely
3462 */
3463 del_timer(&console_timer);
3464 blank_timer_expired = 0;
3465
3466 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3467 return;
3468 if (console_blanked)
3469 unblank_screen();
3470 else if (blankinterval) {
3471 mod_timer(&console_timer, jiffies + blankinterval);
3472 blank_state = blank_normal_wait;
3473 }
3474}
3475
3476/*
3477 * Palettes
3478 */
3479
3480static void set_palette(struct vc_data *vc)
3481{
3482 WARN_CONSOLE_UNLOCKED();
3483
3484 if (vc->vc_mode != KD_GRAPHICS)
3485 vc->vc_sw->con_set_palette(vc, color_table);
3486}
3487
3488static int set_get_cmap(unsigned char __user *arg, int set)
3489{
3490 int i, j, k;
3491
3492 WARN_CONSOLE_UNLOCKED();
3493
3494 for (i = 0; i < 16; i++)
3495 if (set) {
3496 get_user(default_red[i], arg++);
3497 get_user(default_grn[i], arg++);
3498 get_user(default_blu[i], arg++);
3499 } else {
3500 put_user(default_red[i], arg++);
3501 put_user(default_grn[i], arg++);
3502 put_user(default_blu[i], arg++);
3503 }
3504 if (set) {
3505 for (i = 0; i < MAX_NR_CONSOLES; i++)
3506 if (vc_cons_allocated(i)) {
3507 for (j = k = 0; j < 16; j++) {
3508 vc_cons[i].d->vc_palette[k++] = default_red[j];
3509 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3510 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3511 }
3512 set_palette(vc_cons[i].d);
3513 }
3514 }
3515 return 0;
3516}
3517
3518/*
3519 * Load palette into the DAC registers. arg points to a colour
3520 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3521 */
3522
3523int con_set_cmap(unsigned char __user *arg)
3524{
3525 int rc;
3526
3527 acquire_console_sem();
3528 rc = set_get_cmap (arg,1);
3529 release_console_sem();
3530
3531 return rc;
3532}
3533
3534int con_get_cmap(unsigned char __user *arg)
3535{
3536 int rc;
3537
3538 acquire_console_sem();
3539 rc = set_get_cmap (arg,0);
3540 release_console_sem();
3541
3542 return rc;
3543}
3544
3545void reset_palette(struct vc_data *vc)
3546{
3547 int j, k;
3548 for (j=k=0; j<16; j++) {
3549 vc->vc_palette[k++] = default_red[j];
3550 vc->vc_palette[k++] = default_grn[j];
3551 vc->vc_palette[k++] = default_blu[j];
3552 }
3553 set_palette(vc);
3554}
3555
3556/*
3557 * Font switching
3558 *
3559 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3560 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3561 * depending on width) reserved for each character which is kinda wasty, but
3562 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3563 * is upto the actual low-level console-driver convert data into its favorite
3564 * format (maybe we should add a `fontoffset' field to the `display'
3565 * structure so we won't have to convert the fontdata all the time.
3566 * /Jes
3567 */
3568
3569#define max_font_size 65536
3570
3571static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3572{
3573 struct console_font font;
3574 int rc = -EINVAL;
3575 int c;
3576
3577 if (vc->vc_mode != KD_TEXT)
3578 return -EINVAL;
3579
3580 if (op->data) {
3581 font.data = kmalloc(max_font_size, GFP_KERNEL);
3582 if (!font.data)
3583 return -ENOMEM;
3584 } else
3585 font.data = NULL;
3586
3587 acquire_console_sem();
3588 if (vc->vc_sw->con_font_get)
3589 rc = vc->vc_sw->con_font_get(vc, &font);
3590 else
3591 rc = -ENOSYS;
3592 release_console_sem();
3593
3594 if (rc)
3595 goto out;
3596
3597 c = (font.width+7)/8 * 32 * font.charcount;
3598
3599 if (op->data && font.charcount > op->charcount)
3600 rc = -ENOSPC;
3601 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3602 if (font.width > op->width || font.height > op->height)
3603 rc = -ENOSPC;
3604 } else {
3605 if (font.width != 8)
3606 rc = -EIO;
3607 else if ((op->height && font.height > op->height) ||
3608 font.height > 32)
3609 rc = -ENOSPC;
3610 }
3611 if (rc)
3612 goto out;
3613
3614 op->height = font.height;
3615 op->width = font.width;
3616 op->charcount = font.charcount;
3617
3618 if (op->data && copy_to_user(op->data, font.data, c))
3619 rc = -EFAULT;
3620
3621out:
3622 kfree(font.data);
3623 return rc;
3624}
3625
3626static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3627{
3628 struct console_font font;
3629 int rc = -EINVAL;
3630 int size;
3631
3632 if (vc->vc_mode != KD_TEXT)
3633 return -EINVAL;
3634 if (!op->data)
3635 return -EINVAL;
3636 if (op->charcount > 512)
3637 return -EINVAL;
3638 if (!op->height) { /* Need to guess font height [compat] */
3639 int h, i;
3640 u8 __user *charmap = op->data;
3641 u8 tmp;
3642
3643 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3644 so that we can get rid of this soon */
3645 if (!(op->flags & KD_FONT_FLAG_OLD))
3646 return -EINVAL;
3647 for (h = 32; h > 0; h--)
3648 for (i = 0; i < op->charcount; i++) {
3649 if (get_user(tmp, &charmap[32*i+h-1]))
3650 return -EFAULT;
3651 if (tmp)
3652 goto nonzero;
3653 }
3654 return -EINVAL;
3655 nonzero:
3656 op->height = h;
3657 }
3658 if (op->width <= 0 || op->width > 32 || op->height > 32)
3659 return -EINVAL;
3660 size = (op->width+7)/8 * 32 * op->charcount;
3661 if (size > max_font_size)
3662 return -ENOSPC;
3663 font.charcount = op->charcount;
3664 font.height = op->height;
3665 font.width = op->width;
3666 font.data = kmalloc(size, GFP_KERNEL);
3667 if (!font.data)
3668 return -ENOMEM;
3669 if (copy_from_user(font.data, op->data, size)) {
3670 kfree(font.data);
3671 return -EFAULT;
3672 }
3673 acquire_console_sem();
3674 if (vc->vc_sw->con_font_set)
3675 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3676 else
3677 rc = -ENOSYS;
3678 release_console_sem();
3679 kfree(font.data);
3680 return rc;
3681}
3682
3683static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3684{
3685 struct console_font font = {.width = op->width, .height = op->height};
3686 char name[MAX_FONT_NAME];
3687 char *s = name;
3688 int rc;
3689
3690 if (vc->vc_mode != KD_TEXT)
3691 return -EINVAL;
3692
3693 if (!op->data)
3694 s = NULL;
3695 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3696 return -EFAULT;
3697 else
3698 name[MAX_FONT_NAME - 1] = 0;
3699
3700 acquire_console_sem();
3701 if (vc->vc_sw->con_font_default)
3702 rc = vc->vc_sw->con_font_default(vc, &font, s);
3703 else
3704 rc = -ENOSYS;
3705 release_console_sem();
3706 if (!rc) {
3707 op->width = font.width;
3708 op->height = font.height;
3709 }
3710 return rc;
3711}
3712
3713static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3714{
3715 int con = op->height;
3716 int rc;
3717
3718 if (vc->vc_mode != KD_TEXT)
3719 return -EINVAL;
3720
3721 acquire_console_sem();
3722 if (!vc->vc_sw->con_font_copy)
3723 rc = -ENOSYS;
3724 else if (con < 0 || !vc_cons_allocated(con))
3725 rc = -ENOTTY;
3726 else if (con == vc->vc_num) /* nothing to do */
3727 rc = 0;
3728 else
3729 rc = vc->vc_sw->con_font_copy(vc, con);
3730 release_console_sem();
3731 return rc;
3732}
3733
3734int con_font_op(struct vc_data *vc, struct console_font_op *op)
3735{
3736 switch (op->op) {
3737 case KD_FONT_OP_SET:
3738 return con_font_set(vc, op);
3739 case KD_FONT_OP_GET:
3740 return con_font_get(vc, op);
3741 case KD_FONT_OP_SET_DEFAULT:
3742 return con_font_default(vc, op);
3743 case KD_FONT_OP_COPY:
3744 return con_font_copy(vc, op);
3745 }
3746 return -ENOSYS;
3747}
3748
3749/*
3750 * Interface exported to selection and vcs.
3751 */
3752
3753/* used by selection */
3754u16 screen_glyph(struct vc_data *vc, int offset)
3755{
3756 u16 w = scr_readw(screenpos(vc, offset, 1));
3757 u16 c = w & 0xff;
3758
3759 if (w & vc->vc_hi_font_mask)
3760 c |= 0x100;
3761 return c;
3762}
3763
3764/* used by vcs - note the word offset */
3765unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3766{
3767 return screenpos(vc, 2 * w_offset, viewed);
3768}
3769
3770void getconsxy(struct vc_data *vc, unsigned char *p)
3771{
3772 p[0] = vc->vc_x;
3773 p[1] = vc->vc_y;
3774}
3775
3776void putconsxy(struct vc_data *vc, unsigned char *p)
3777{
9477e260 3778 hide_cursor(vc);
1da177e4
LT		 3779 gotoxy(vc, p[0], p[1]);
3780 set_cursor(vc);
3781}
3782
3783u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3784{
3785 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3786 return softcursor_original;
3787 return scr_readw(org);
3788}
3789
3790void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3791{
3792 scr_writew(val, org);
3793 if ((unsigned long)org == vc->vc_pos) {
3794 softcursor_original = -1;
3795 add_softcursor(vc);
3796 }
3797}
3798
3799/*
3800 * Visible symbols for modules
3801 */
3802
3803EXPORT_SYMBOL(color_table);
3804EXPORT_SYMBOL(default_red);
3805EXPORT_SYMBOL(default_grn);
3806EXPORT_SYMBOL(default_blu);
3807EXPORT_SYMBOL(update_region);
3808EXPORT_SYMBOL(redraw_screen);
3809EXPORT_SYMBOL(vc_resize);
ca9bda00 3810EXPORT_SYMBOL(vc_lock_resize);
1da177e4
LT		 3811EXPORT_SYMBOL(fg_console);
3812EXPORT_SYMBOL(console_blank_hook);
3813EXPORT_SYMBOL(console_blanked);
3814EXPORT_SYMBOL(vc_cons);
3815#ifndef VT_SINGLE_DRIVER
3816EXPORT_SYMBOL(take_over_console);
3817EXPORT_SYMBOL(give_up_console);
3818#endif
Linux 6.x block layer and io_uring tree(s)