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[linux.git] / drivers / char / vt.c
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1da177e4
LT		 1/*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <[email protected]>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <[email protected]>.
23 *
24 * Dynamic allocation of consoles, [email protected], May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <[email protected]>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <[email protected]> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <[email protected]>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <[email protected]>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <[email protected]>
41 * - David Carter <[email protected]>
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 <[email protected]>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <[email protected]>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <[email protected]>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <[email protected]>
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 <[email protected]>, 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;
c2c88f10 727 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 728 visual_init(vc, currcons, 1);
729 if (!*vc->vc_uni_pagedir_loc)
730 con_set_default_unimap(vc);
254e948b
CM		 731 if (!vc->vc_kmalloced)
732 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 733 if (!vc->vc_screenbuf) {
734 kfree(vc);
735 vc_cons[currcons].d = NULL;
736 return -ENOMEM;
737 }
738 vc->vc_kmalloced = 1;
739 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
740 }
741 return 0;
742}
743
744static inline int resize_screen(struct vc_data *vc, int width, int height)
745{
746 /* Resizes the resolution of the display adapater */
747 int err = 0;
748
749 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
750 err = vc->vc_sw->con_resize(vc, width, height);
751 return err;
752}
753
754/*
755 * Change # of rows and columns (0 means unchanged/the size of fg_console)
756 * [this is to be used together with some user program
757 * like resize that changes the hardware videomode]
758 */
759#define VC_RESIZE_MAXCOL (32767)
760#define VC_RESIZE_MAXROW (32767)
761int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
762{
763 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
764 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
765 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
3b41dc1a 766 unsigned int end;
1da177e4
LT		 767 unsigned short *newscreen;
768
769 WARN_CONSOLE_UNLOCKED();
770
771 if (!vc)
772 return -ENXIO;
773
774 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
775 return -EINVAL;
776
777 new_cols = (cols ? cols : vc->vc_cols);
778 new_rows = (lines ? lines : vc->vc_rows);
779 new_row_size = new_cols << 1;
780 new_screen_size = new_row_size * new_rows;
781
782 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
783 return 0;
784
5cbded58 785 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 786 if (!newscreen)
787 return -ENOMEM;
788
789 old_rows = vc->vc_rows;
790 old_cols = vc->vc_cols;
791 old_row_size = vc->vc_size_row;
792 old_screen_size = vc->vc_screenbuf_size;
793
794 err = resize_screen(vc, new_cols, new_rows);
795 if (err) {
796 kfree(newscreen);
797 return err;
798 }
799
800 vc->vc_rows = new_rows;
801 vc->vc_cols = new_cols;
802 vc->vc_size_row = new_row_size;
803 vc->vc_screenbuf_size = new_screen_size;
804
805 rlth = min(old_row_size, new_row_size);
806 rrem = new_row_size - rlth;
807 old_origin = vc->vc_origin;
808 new_origin = (long) newscreen;
809 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 810
811 if (vc->vc_y > new_rows) {
812 if (old_rows - vc->vc_y < new_rows) {
813 /*
814 * Cursor near the bottom, copy contents from the
815 * bottom of buffer
816 */
817 old_origin += (old_rows - new_rows) * old_row_size;
818 end = vc->vc_scr_end;
819 } else {
820 /*
821 * Cursor is in no man's land, copy 1/2 screenful
822 * from the top and bottom of cursor position
823 */
824 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 825 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 826 }
827 } else
828 /*
829 * Cursor near the top, copy contents from the top of buffer
830 */
065d9cac
AD		 831 end = (old_rows > new_rows) ? old_origin +
832 (old_row_size * new_rows) :
3b41dc1a 833 vc->vc_scr_end;
1da177e4
LT		 834
835 update_attr(vc);
836
3b41dc1a
AD		 837 while (old_origin < end) {
838 scr_memcpyw((unsigned short *) new_origin,
839 (unsigned short *) old_origin, rlth);
1da177e4 840 if (rrem)
3b41dc1a
AD		 841 scr_memsetw((void *)(new_origin + rlth),
842 vc->vc_video_erase_char, rrem);
1da177e4
LT		 843 old_origin += old_row_size;
844 new_origin += new_row_size;
845 }
846 if (new_scr_end > new_origin)
3b41dc1a
AD		 847 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
848 new_scr_end - new_origin);
1da177e4
LT		 849 if (vc->vc_kmalloced)
850 kfree(vc->vc_screenbuf);
851 vc->vc_screenbuf = newscreen;
852 vc->vc_kmalloced = 1;
853 vc->vc_screenbuf_size = new_screen_size;
854 set_origin(vc);
855
856 /* do part of a reset_terminal() */
857 vc->vc_top = 0;
858 vc->vc_bottom = vc->vc_rows;
859 gotoxy(vc, vc->vc_x, vc->vc_y);
860 save_cur(vc);
861
862 if (vc->vc_tty) {
863 struct winsize ws, *cws = &vc->vc_tty->winsize;
864
865 memset(&ws, 0, sizeof(ws));
866 ws.ws_row = vc->vc_rows;
867 ws.ws_col = vc->vc_cols;
868 ws.ws_ypixel = vc->vc_scan_lines;
869 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
ab521dc0
EB		 870 vc->vc_tty->pgrp)
871 kill_pgrp(vc->vc_tty->pgrp, SIGWINCH, 1);
1da177e4
LT		 872 *cws = ws;
873 }
874
875 if (CON_IS_VISIBLE(vc))
876 update_screen(vc);
877 return err;
878}
879
ca9bda00
AC		 880int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
881{
882 int rc;
883
884 acquire_console_sem();
885 rc = vc_resize(vc, cols, lines);
886 release_console_sem();
887 return rc;
888}
1da177e4 889
ca9bda00 890void vc_deallocate(unsigned int currcons)
1da177e4
LT		 891{
892 WARN_CONSOLE_UNLOCKED();
893
894 if (vc_cons_allocated(currcons)) {
895 struct vc_data *vc = vc_cons[currcons].d;
896 vc->vc_sw->con_deinit(vc);
bde0d2c9 897 put_pid(vc->vt_pid);
d459ec0b 898 module_put(vc->vc_sw->owner);
1da177e4
LT		 899 if (vc->vc_kmalloced)
900 kfree(vc->vc_screenbuf);
901 if (currcons >= MIN_NR_CONSOLES)
902 kfree(vc);
903 vc_cons[currcons].d = NULL;
904 }
905}
906
907/*
908 * VT102 emulator
909 */
910
911#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
912#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
913#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
914
915#define decarm VC_REPEAT
916#define decckm VC_CKMODE
917#define kbdapplic VC_APPLIC
918#define lnm VC_CRLF
919
920/*
921 * this is what the terminal answers to a ESC-Z or csi0c query.
922 */
923#define VT100ID "\033[?1;2c"
924#define VT102ID "\033[?6c"
925
926unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
927 8,12,10,14, 9,13,11,15 };
928
929/* the default colour table, for VGA+ colour systems */
930int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
931 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
932int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
933 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
934int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
935 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
936
937/*
938 * gotoxy() must verify all boundaries, because the arguments
939 * might also be negative. If the given position is out of
940 * bounds, the cursor is placed at the nearest margin.
941 */
942static void gotoxy(struct vc_data *vc, int new_x, int new_y)
943{
944 int min_y, max_y;
945
946 if (new_x < 0)
947 vc->vc_x = 0;
948 else {
949 if (new_x >= vc->vc_cols)
950 vc->vc_x = vc->vc_cols - 1;
951 else
952 vc->vc_x = new_x;
953 }
954
955 if (vc->vc_decom) {
956 min_y = vc->vc_top;
957 max_y = vc->vc_bottom;
958 } else {
959 min_y = 0;
960 max_y = vc->vc_rows;
961 }
962 if (new_y < min_y)
963 vc->vc_y = min_y;
964 else if (new_y >= max_y)
965 vc->vc_y = max_y - 1;
966 else
967 vc->vc_y = new_y;
968 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
969 vc->vc_need_wrap = 0;
970}
971
972/* for absolute user moves, when decom is set */
973static void gotoxay(struct vc_data *vc, int new_x, int new_y)
974{
975 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
976}
977
978void scrollback(struct vc_data *vc, int lines)
979{
980 if (!lines)
981 lines = vc->vc_rows / 2;
982 scrolldelta(-lines);
983}
984
985void scrollfront(struct vc_data *vc, int lines)
986{
987 if (!lines)
988 lines = vc->vc_rows / 2;
989 scrolldelta(lines);
990}
991
992static void lf(struct vc_data *vc)
993{
994 /* don't scroll if above bottom of scrolling region, or
995 * if below scrolling region
996 */
997 if (vc->vc_y + 1 == vc->vc_bottom)
998 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
999 else if (vc->vc_y < vc->vc_rows - 1) {
1000 vc->vc_y++;
1001 vc->vc_pos += vc->vc_size_row;
1002 }
1003 vc->vc_need_wrap = 0;
1004}
1005
1006static void ri(struct vc_data *vc)
1007{
1008 /* don't scroll if below top of scrolling region, or
1009 * if above scrolling region
1010 */
1011 if (vc->vc_y == vc->vc_top)
1012 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1013 else if (vc->vc_y > 0) {
1014 vc->vc_y--;
1015 vc->vc_pos -= vc->vc_size_row;
1016 }
1017 vc->vc_need_wrap = 0;
1018}
1019
1020static inline void cr(struct vc_data *vc)
1021{
1022 vc->vc_pos -= vc->vc_x << 1;
1023 vc->vc_need_wrap = vc->vc_x = 0;
1024}
1025
1026static inline void bs(struct vc_data *vc)
1027{
1028 if (vc->vc_x) {
1029 vc->vc_pos -= 2;
1030 vc->vc_x--;
1031 vc->vc_need_wrap = 0;
1032 }
1033}
1034
1035static inline void del(struct vc_data *vc)
1036{
1037 /* ignored */
1038}
1039
1040static void csi_J(struct vc_data *vc, int vpar)
1041{
1042 unsigned int count;
1043 unsigned short * start;
1044
1045 switch (vpar) {
1046 case 0: /* erase from cursor to end of display */
1047 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1048 start = (unsigned short *)vc->vc_pos;
1049 if (DO_UPDATE(vc)) {
1050 /* do in two stages */
1051 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1052 vc->vc_cols - vc->vc_x);
1053 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1054 vc->vc_rows - vc->vc_y - 1,
1055 vc->vc_cols);
1056 }
1057 break;
1058 case 1: /* erase from start to cursor */
1059 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1060 start = (unsigned short *)vc->vc_origin;
1061 if (DO_UPDATE(vc)) {
1062 /* do in two stages */
1063 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1064 vc->vc_cols);
1065 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1066 vc->vc_x + 1);
1067 }
1068 break;
1069 case 2: /* erase whole display */
1070 count = vc->vc_cols * vc->vc_rows;
1071 start = (unsigned short *)vc->vc_origin;
1072 if (DO_UPDATE(vc))
1073 vc->vc_sw->con_clear(vc, 0, 0,
1074 vc->vc_rows,
1075 vc->vc_cols);
1076 break;
1077 default:
1078 return;
1079 }
1080 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1081 vc->vc_need_wrap = 0;
1082}
1083
1084static void csi_K(struct vc_data *vc, int vpar)
1085{
1086 unsigned int count;
1087 unsigned short * start;
1088
1089 switch (vpar) {
1090 case 0: /* erase from cursor to end of line */
1091 count = vc->vc_cols - vc->vc_x;
1092 start = (unsigned short *)vc->vc_pos;
1093 if (DO_UPDATE(vc))
1094 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1095 vc->vc_cols - vc->vc_x);
1096 break;
1097 case 1: /* erase from start of line to cursor */
1098 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1099 count = vc->vc_x + 1;
1100 if (DO_UPDATE(vc))
1101 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1102 vc->vc_x + 1);
1103 break;
1104 case 2: /* erase whole line */
1105 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1106 count = vc->vc_cols;
1107 if (DO_UPDATE(vc))
1108 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1109 vc->vc_cols);
1110 break;
1111 default:
1112 return;
1113 }
1114 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1115 vc->vc_need_wrap = 0;
1116}
1117
1118static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1119{ /* not vt100? */
1120 int count;
1121
1122 if (!vpar)
1123 vpar++;
1124 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1125
1126 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1127 if (DO_UPDATE(vc))
1128 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1129 vc->vc_need_wrap = 0;
1130}
1131
1132static void default_attr(struct vc_data *vc)
1133{
1134 vc->vc_intensity = 1;
1135 vc->vc_underline = 0;
1136 vc->vc_reverse = 0;
1137 vc->vc_blink = 0;
1138 vc->vc_color = vc->vc_def_color;
1139}
1140
1141/* console_sem is held */
1142static void csi_m(struct vc_data *vc)
1143{
1144 int i;
1145
1146 for (i = 0; i <= vc->vc_npar; i++)
1147 switch (vc->vc_par[i]) {
1148 case 0: /* all attributes off */
1149 default_attr(vc);
1150 break;
1151 case 1:
1152 vc->vc_intensity = 2;
1153 break;
1154 case 2:
1155 vc->vc_intensity = 0;
1156 break;
1157 case 4:
1158 vc->vc_underline = 1;
1159 break;
1160 case 5:
1161 vc->vc_blink = 1;
1162 break;
1163 case 7:
1164 vc->vc_reverse = 1;
1165 break;
1166 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1167 * Select primary font, don't display
1168 * control chars if defined, don't set
1169 * bit 8 on output.
1170 */
1171 vc->vc_translate = set_translate(vc->vc_charset == 0
1172 ? vc->vc_G0_charset
1173 : vc->vc_G1_charset, vc);
1174 vc->vc_disp_ctrl = 0;
1175 vc->vc_toggle_meta = 0;
1176 break;
1177 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1178 * Select first alternate font, lets
1179 * chars < 32 be displayed as ROM chars.
1180 */
1181 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1182 vc->vc_disp_ctrl = 1;
1183 vc->vc_toggle_meta = 0;
1184 break;
1185 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1186 * Select second alternate font, toggle
1187 * high bit before displaying as ROM char.
1188 */
1189 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1190 vc->vc_disp_ctrl = 1;
1191 vc->vc_toggle_meta = 1;
1192 break;
1193 case 21:
1194 case 22:
1195 vc->vc_intensity = 1;
1196 break;
1197 case 24:
1198 vc->vc_underline = 0;
1199 break;
1200 case 25:
1201 vc->vc_blink = 0;
1202 break;
1203 case 27:
1204 vc->vc_reverse = 0;
1205 break;
1206 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1207 * Enables underscore, white foreground
1208 * with white underscore (Linux - use
1209 * default foreground).
1210 */
1211 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1212 vc->vc_underline = 1;
1213 break;
1214 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1215 * Disable underline option.
1216 * Reset colour to default? It did this
1217 * before...
1218 */
1219 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1220 vc->vc_underline = 0;
1221 break;
1222 case 49:
1223 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1224 break;
1225 default:
1226 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1227 vc->vc_color = color_table[vc->vc_par[i] - 30]
1228 | (vc->vc_color & 0xf0);
1229 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1230 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1231 | (vc->vc_color & 0x0f);
1232 break;
1233 }
1234 update_attr(vc);
1235}
1236
1237static void respond_string(const char *p, struct tty_struct *tty)
1238{
1239 while (*p) {
1240 tty_insert_flip_char(tty, *p, 0);
1241 p++;
1242 }
1243 con_schedule_flip(tty);
1244}
1245
1246static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1247{
1248 char buf[40];
1249
1250 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1251 respond_string(buf, tty);
1252}
1253
1254static inline void status_report(struct tty_struct *tty)
1255{
1256 respond_string("\033[0n", tty); /* Terminal ok */
1257}
1258
1259static inline void respond_ID(struct tty_struct * tty)
1260{
1261 respond_string(VT102ID, tty);
1262}
1263
1264void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1265{
1266 char buf[8];
1267
1268 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1269 (char)('!' + mry));
1270 respond_string(buf, tty);
1271}
1272
1273/* invoked via ioctl(TIOCLINUX) and through set_selection */
1274int mouse_reporting(void)
1275{
1276 return vc_cons[fg_console].d->vc_report_mouse;
1277}
1278
1279/* console_sem is held */
1280static void set_mode(struct vc_data *vc, int on_off)
1281{
1282 int i;
1283
1284 for (i = 0; i <= vc->vc_npar; i++)
1285 if (vc->vc_ques) {
1286 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1287 case 1: /* Cursor keys send ^[Ox/^[[x */
1288 if (on_off)
1289 set_kbd(vc, decckm);
1290 else
1291 clr_kbd(vc, decckm);
1292 break;
1293 case 3: /* 80/132 mode switch unimplemented */
1294 vc->vc_deccolm = on_off;
1295#if 0
1296 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1297 /* this alone does not suffice; some user mode
1298 utility has to change the hardware regs */
1299#endif
1300 break;
1301 case 5: /* Inverted screen on/off */
1302 if (vc->vc_decscnm != on_off) {
1303 vc->vc_decscnm = on_off;
1304 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1305 update_attr(vc);
1306 }
1307 break;
1308 case 6: /* Origin relative/absolute */
1309 vc->vc_decom = on_off;
1310 gotoxay(vc, 0, 0);
1311 break;
1312 case 7: /* Autowrap on/off */
1313 vc->vc_decawm = on_off;
1314 break;
1315 case 8: /* Autorepeat on/off */
1316 if (on_off)
1317 set_kbd(vc, decarm);
1318 else
1319 clr_kbd(vc, decarm);
1320 break;
1321 case 9:
1322 vc->vc_report_mouse = on_off ? 1 : 0;
1323 break;
1324 case 25: /* Cursor on/off */
1325 vc->vc_deccm = on_off;
1326 break;
1327 case 1000:
1328 vc->vc_report_mouse = on_off ? 2 : 0;
1329 break;
1330 }
1331 } else {
1332 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1333 case 3: /* Monitor (display ctrls) */
1334 vc->vc_disp_ctrl = on_off;
1335 break;
1336 case 4: /* Insert Mode on/off */
1337 vc->vc_decim = on_off;
1338 break;
1339 case 20: /* Lf, Enter == CrLf/Lf */
1340 if (on_off)
1341 set_kbd(vc, lnm);
1342 else
1343 clr_kbd(vc, lnm);
1344 break;
1345 }
1346 }
1347}
1348
1349/* console_sem is held */
1350static void setterm_command(struct vc_data *vc)
1351{
1352 switch(vc->vc_par[0]) {
1353 case 1: /* set color for underline mode */
1354 if (vc->vc_can_do_color &&
1355 vc->vc_par[1] < 16) {
1356 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1357 if (vc->vc_underline)
1358 update_attr(vc);
1359 }
1360 break;
1361 case 2: /* set color for half intensity mode */
1362 if (vc->vc_can_do_color &&
1363 vc->vc_par[1] < 16) {
1364 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1365 if (vc->vc_intensity == 0)
1366 update_attr(vc);
1367 }
1368 break;
1369 case 8: /* store colors as defaults */
1370 vc->vc_def_color = vc->vc_attr;
1371 if (vc->vc_hi_font_mask == 0x100)
1372 vc->vc_def_color >>= 1;
1373 default_attr(vc);
1374 update_attr(vc);
1375 break;
1376 case 9: /* set blanking interval */
1377 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1378 poke_blanked_console();
1379 break;
1380 case 10: /* set bell frequency in Hz */
1381 if (vc->vc_npar >= 1)
1382 vc->vc_bell_pitch = vc->vc_par[1];
1383 else
1384 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1385 break;
1386 case 11: /* set bell duration in msec */
1387 if (vc->vc_npar >= 1)
1388 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1389 vc->vc_par[1] * HZ / 1000 : 0;
1390 else
1391 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1392 break;
1393 case 12: /* bring specified console to the front */
1394 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1395 set_console(vc->vc_par[1] - 1);
1396 break;
1397 case 13: /* unblank the screen */
1398 poke_blanked_console();
1399 break;
1400 case 14: /* set vesa powerdown interval */
1401 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1402 break;
1403 case 15: /* activate the previous console */
1404 set_console(last_console);
1405 break;
1406 }
1407}
1408
1409/* console_sem is held */
1410static void csi_at(struct vc_data *vc, unsigned int nr)
1411{
1412 if (nr > vc->vc_cols - vc->vc_x)
1413 nr = vc->vc_cols - vc->vc_x;
1414 else if (!nr)
1415 nr = 1;
1416 insert_char(vc, nr);
1417}
1418
1419/* console_sem is held */
1420static void csi_L(struct vc_data *vc, unsigned int nr)
1421{
1422 if (nr > vc->vc_rows - vc->vc_y)
1423 nr = vc->vc_rows - vc->vc_y;
1424 else if (!nr)
1425 nr = 1;
1426 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1427 vc->vc_need_wrap = 0;
1428}
1429
1430/* console_sem is held */
1431static void csi_P(struct vc_data *vc, unsigned int nr)
1432{
1433 if (nr > vc->vc_cols - vc->vc_x)
1434 nr = vc->vc_cols - vc->vc_x;
1435 else if (!nr)
1436 nr = 1;
1437 delete_char(vc, nr);
1438}
1439
1440/* console_sem is held */
1441static void csi_M(struct vc_data *vc, unsigned int nr)
1442{
1443 if (nr > vc->vc_rows - vc->vc_y)
1444 nr = vc->vc_rows - vc->vc_y;
1445 else if (!nr)
1446 nr=1;
1447 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1448 vc->vc_need_wrap = 0;
1449}
1450
1451/* console_sem is held (except via vc_init->reset_terminal */
1452static void save_cur(struct vc_data *vc)
1453{
1454 vc->vc_saved_x = vc->vc_x;
1455 vc->vc_saved_y = vc->vc_y;
1456 vc->vc_s_intensity = vc->vc_intensity;
1457 vc->vc_s_underline = vc->vc_underline;
1458 vc->vc_s_blink = vc->vc_blink;
1459 vc->vc_s_reverse = vc->vc_reverse;
1460 vc->vc_s_charset = vc->vc_charset;
1461 vc->vc_s_color = vc->vc_color;
1462 vc->vc_saved_G0 = vc->vc_G0_charset;
1463 vc->vc_saved_G1 = vc->vc_G1_charset;
1464}
1465
1466/* console_sem is held */
1467static void restore_cur(struct vc_data *vc)
1468{
1469 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1470 vc->vc_intensity = vc->vc_s_intensity;
1471 vc->vc_underline = vc->vc_s_underline;
1472 vc->vc_blink = vc->vc_s_blink;
1473 vc->vc_reverse = vc->vc_s_reverse;
1474 vc->vc_charset = vc->vc_s_charset;
1475 vc->vc_color = vc->vc_s_color;
1476 vc->vc_G0_charset = vc->vc_saved_G0;
1477 vc->vc_G1_charset = vc->vc_saved_G1;
1478 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1479 update_attr(vc);
1480 vc->vc_need_wrap = 0;
1481}
1482
1483enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1484 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1485 ESpalette };
1486
1487/* console_sem is held (except via vc_init()) */
1488static void reset_terminal(struct vc_data *vc, int do_clear)
1489{
1490 vc->vc_top = 0;
1491 vc->vc_bottom = vc->vc_rows;
1492 vc->vc_state = ESnormal;
1493 vc->vc_ques = 0;
1494 vc->vc_translate = set_translate(LAT1_MAP, vc);
1495 vc->vc_G0_charset = LAT1_MAP;
1496 vc->vc_G1_charset = GRAF_MAP;
1497 vc->vc_charset = 0;
1498 vc->vc_need_wrap = 0;
1499 vc->vc_report_mouse = 0;
1500 vc->vc_utf = 0;
1501 vc->vc_utf_count = 0;
1502
1503 vc->vc_disp_ctrl = 0;
1504 vc->vc_toggle_meta = 0;
1505
1506 vc->vc_decscnm = 0;
1507 vc->vc_decom = 0;
1508 vc->vc_decawm = 1;
1509 vc->vc_deccm = 1;
1510 vc->vc_decim = 0;
1511
1512 set_kbd(vc, decarm);
1513 clr_kbd(vc, decckm);
1514 clr_kbd(vc, kbdapplic);
1515 clr_kbd(vc, lnm);
1516 kbd_table[vc->vc_num].lockstate = 0;
1517 kbd_table[vc->vc_num].slockstate = 0;
1518 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1519 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1520 /* do not do set_leds here because this causes an endless tasklet loop
1521 when the keyboard hasn't been initialized yet */
1522
1523 vc->vc_cursor_type = CUR_DEFAULT;
1524 vc->vc_complement_mask = vc->vc_s_complement_mask;
1525
1526 default_attr(vc);
1527 update_attr(vc);
1528
1529 vc->vc_tab_stop[0] = 0x01010100;
1530 vc->vc_tab_stop[1] =
1531 vc->vc_tab_stop[2] =
1532 vc->vc_tab_stop[3] =
1533 vc->vc_tab_stop[4] = 0x01010101;
1534
1535 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1536 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1537
1538 gotoxy(vc, 0, 0);
1539 save_cur(vc);
1540 if (do_clear)
1541 csi_J(vc, 2);
1542}
1543
1544/* console_sem is held */
1545static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1546{
1547 /*
1548 * Control characters can be used in the _middle_
1549 * of an escape sequence.
1550 */
1551 switch (c) {
1552 case 0:
1553 return;
1554 case 7:
1555 if (vc->vc_bell_duration)
1556 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1557 return;
1558 case 8:
1559 bs(vc);
1560 return;
1561 case 9:
1562 vc->vc_pos -= (vc->vc_x << 1);
1563 while (vc->vc_x < vc->vc_cols - 1) {
1564 vc->vc_x++;
1565 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1566 break;
1567 }
1568 vc->vc_pos += (vc->vc_x << 1);
1569 return;
1570 case 10: case 11: case 12:
1571 lf(vc);
1572 if (!is_kbd(vc, lnm))
1573 return;
1574 case 13:
1575 cr(vc);
1576 return;
1577 case 14:
1578 vc->vc_charset = 1;
1579 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1580 vc->vc_disp_ctrl = 1;
1581 return;
1582 case 15:
1583 vc->vc_charset = 0;
1584 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1585 vc->vc_disp_ctrl = 0;
1586 return;
1587 case 24: case 26:
1588 vc->vc_state = ESnormal;
1589 return;
1590 case 27:
1591 vc->vc_state = ESesc;
1592 return;
1593 case 127:
1594 del(vc);
1595 return;
1596 case 128+27:
1597 vc->vc_state = ESsquare;
1598 return;
1599 }
1600 switch(vc->vc_state) {
1601 case ESesc:
1602 vc->vc_state = ESnormal;
1603 switch (c) {
1604 case '[':
1605 vc->vc_state = ESsquare;
1606 return;
1607 case ']':
1608 vc->vc_state = ESnonstd;
1609 return;
1610 case '%':
1611 vc->vc_state = ESpercent;
1612 return;
1613 case 'E':
1614 cr(vc);
1615 lf(vc);
1616 return;
1617 case 'M':
1618 ri(vc);
1619 return;
1620 case 'D':
1621 lf(vc);
1622 return;
1623 case 'H':
1624 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1625 return;
1626 case 'Z':
1627 respond_ID(tty);
1628 return;
1629 case '7':
1630 save_cur(vc);
1631 return;
1632 case '8':
1633 restore_cur(vc);
1634 return;
1635 case '(':
1636 vc->vc_state = ESsetG0;
1637 return;
1638 case ')':
1639 vc->vc_state = ESsetG1;
1640 return;
1641 case '#':
1642 vc->vc_state = EShash;
1643 return;
1644 case 'c':
1645 reset_terminal(vc, 1);
1646 return;
1647 case '>': /* Numeric keypad */
1648 clr_kbd(vc, kbdapplic);
1649 return;
1650 case '=': /* Appl. keypad */
1651 set_kbd(vc, kbdapplic);
1652 return;
1653 }
1654 return;
1655 case ESnonstd:
1656 if (c=='P') { /* palette escape sequence */
1657 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1658 vc->vc_par[vc->vc_npar] = 0;
1659 vc->vc_npar = 0;
1660 vc->vc_state = ESpalette;
1661 return;
1662 } else if (c=='R') { /* reset palette */
1663 reset_palette(vc);
1664 vc->vc_state = ESnormal;
1665 } else
1666 vc->vc_state = ESnormal;
1667 return;
1668 case ESpalette:
1669 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1670 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1671 if (vc->vc_npar == 7) {
1672 int i = vc->vc_par[0] * 3, j = 1;
1673 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1674 vc->vc_palette[i++] += vc->vc_par[j++];
1675 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1676 vc->vc_palette[i++] += vc->vc_par[j++];
1677 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1678 vc->vc_palette[i] += vc->vc_par[j];
1679 set_palette(vc);
1680 vc->vc_state = ESnormal;
1681 }
1682 } else
1683 vc->vc_state = ESnormal;
1684 return;
1685 case ESsquare:
1686 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1687 vc->vc_par[vc->vc_npar] = 0;
1688 vc->vc_npar = 0;
1689 vc->vc_state = ESgetpars;
1690 if (c == '[') { /* Function key */
1691 vc->vc_state=ESfunckey;
1692 return;
1693 }
1694 vc->vc_ques = (c == '?');
1695 if (vc->vc_ques)
1696 return;
1697 case ESgetpars:
1698 if (c == ';' && vc->vc_npar < NPAR - 1) {
1699 vc->vc_npar++;
1700 return;
1701 } else if (c>='0' && c<='9') {
1702 vc->vc_par[vc->vc_npar] *= 10;
1703 vc->vc_par[vc->vc_npar] += c - '0';
1704 return;
1705 } else
1706 vc->vc_state = ESgotpars;
1707 case ESgotpars:
1708 vc->vc_state = ESnormal;
1709 switch(c) {
1710 case 'h':
1711 set_mode(vc, 1);
1712 return;
1713 case 'l':
1714 set_mode(vc, 0);
1715 return;
1716 case 'c':
1717 if (vc->vc_ques) {
1718 if (vc->vc_par[0])
1719 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1720 else
1721 vc->vc_cursor_type = CUR_DEFAULT;
1722 return;
1723 }
1724 break;
1725 case 'm':
1726 if (vc->vc_ques) {
1727 clear_selection();
1728 if (vc->vc_par[0])
1729 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1730 else
1731 vc->vc_complement_mask = vc->vc_s_complement_mask;
1732 return;
1733 }
1734 break;
1735 case 'n':
1736 if (!vc->vc_ques) {
1737 if (vc->vc_par[0] == 5)
1738 status_report(tty);
1739 else if (vc->vc_par[0] == 6)
1740 cursor_report(vc, tty);
1741 }
1742 return;
1743 }
1744 if (vc->vc_ques) {
1745 vc->vc_ques = 0;
1746 return;
1747 }
1748 switch(c) {
1749 case 'G': case '`':
1750 if (vc->vc_par[0])
1751 vc->vc_par[0]--;
1752 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1753 return;
1754 case 'A':
1755 if (!vc->vc_par[0])
1756 vc->vc_par[0]++;
1757 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1758 return;
1759 case 'B': case 'e':
1760 if (!vc->vc_par[0])
1761 vc->vc_par[0]++;
1762 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1763 return;
1764 case 'C': case 'a':
1765 if (!vc->vc_par[0])
1766 vc->vc_par[0]++;
1767 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1768 return;
1769 case 'D':
1770 if (!vc->vc_par[0])
1771 vc->vc_par[0]++;
1772 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1773 return;
1774 case 'E':
1775 if (!vc->vc_par[0])
1776 vc->vc_par[0]++;
1777 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1778 return;
1779 case 'F':
1780 if (!vc->vc_par[0])
1781 vc->vc_par[0]++;
1782 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1783 return;
1784 case 'd':
1785 if (vc->vc_par[0])
1786 vc->vc_par[0]--;
1787 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1788 return;
1789 case 'H': case 'f':
1790 if (vc->vc_par[0])
1791 vc->vc_par[0]--;
1792 if (vc->vc_par[1])
1793 vc->vc_par[1]--;
1794 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1795 return;
1796 case 'J':
1797 csi_J(vc, vc->vc_par[0]);
1798 return;
1799 case 'K':
1800 csi_K(vc, vc->vc_par[0]);
1801 return;
1802 case 'L':
1803 csi_L(vc, vc->vc_par[0]);
1804 return;
1805 case 'M':
1806 csi_M(vc, vc->vc_par[0]);
1807 return;
1808 case 'P':
1809 csi_P(vc, vc->vc_par[0]);
1810 return;
1811 case 'c':
1812 if (!vc->vc_par[0])
1813 respond_ID(tty);
1814 return;
1815 case 'g':
1816 if (!vc->vc_par[0])
1817 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1818 else if (vc->vc_par[0] == 3) {
1819 vc->vc_tab_stop[0] =
1820 vc->vc_tab_stop[1] =
1821 vc->vc_tab_stop[2] =
1822 vc->vc_tab_stop[3] =
1823 vc->vc_tab_stop[4] = 0;
1824 }
1825 return;
1826 case 'm':
1827 csi_m(vc);
1828 return;
1829 case 'q': /* DECLL - but only 3 leds */
1830 /* map 0,1,2,3 to 0,1,2,4 */
1831 if (vc->vc_par[0] < 4)
1832 setledstate(kbd_table + vc->vc_num,
1833 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1834 return;
1835 case 'r':
1836 if (!vc->vc_par[0])
1837 vc->vc_par[0]++;
1838 if (!vc->vc_par[1])
1839 vc->vc_par[1] = vc->vc_rows;
1840 /* Minimum allowed region is 2 lines */
1841 if (vc->vc_par[0] < vc->vc_par[1] &&
1842 vc->vc_par[1] <= vc->vc_rows) {
1843 vc->vc_top = vc->vc_par[0] - 1;
1844 vc->vc_bottom = vc->vc_par[1];
1845 gotoxay(vc, 0, 0);
1846 }
1847 return;
1848 case 's':
1849 save_cur(vc);
1850 return;
1851 case 'u':
1852 restore_cur(vc);
1853 return;
1854 case 'X':
1855 csi_X(vc, vc->vc_par[0]);
1856 return;
1857 case '@':
1858 csi_at(vc, vc->vc_par[0]);
1859 return;
1860 case ']': /* setterm functions */
1861 setterm_command(vc);
1862 return;
1863 }
1864 return;
1865 case ESpercent:
1866 vc->vc_state = ESnormal;
1867 switch (c) {
1868 case '@': /* defined in ISO 2022 */
1869 vc->vc_utf = 0;
1870 return;
1871 case 'G': /* prelim official escape code */
1872 case '8': /* retained for compatibility */
1873 vc->vc_utf = 1;
1874 return;
1875 }
1876 return;
1877 case ESfunckey:
1878 vc->vc_state = ESnormal;
1879 return;
1880 case EShash:
1881 vc->vc_state = ESnormal;
1882 if (c == '8') {
1883 /* DEC screen alignment test. kludge :-) */
1884 vc->vc_video_erase_char =
1885 (vc->vc_video_erase_char & 0xff00) | 'E';
1886 csi_J(vc, 2);
1887 vc->vc_video_erase_char =
1888 (vc->vc_video_erase_char & 0xff00) | ' ';
1889 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1890 }
1891 return;
1892 case ESsetG0:
1893 if (c == '0')
1894 vc->vc_G0_charset = GRAF_MAP;
1895 else if (c == 'B')
1896 vc->vc_G0_charset = LAT1_MAP;
1897 else if (c == 'U')
1898 vc->vc_G0_charset = IBMPC_MAP;
1899 else if (c == 'K')
1900 vc->vc_G0_charset = USER_MAP;
1901 if (vc->vc_charset == 0)
1902 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1903 vc->vc_state = ESnormal;
1904 return;
1905 case ESsetG1:
1906 if (c == '0')
1907 vc->vc_G1_charset = GRAF_MAP;
1908 else if (c == 'B')
1909 vc->vc_G1_charset = LAT1_MAP;
1910 else if (c == 'U')
1911 vc->vc_G1_charset = IBMPC_MAP;
1912 else if (c == 'K')
1913 vc->vc_G1_charset = USER_MAP;
1914 if (vc->vc_charset == 1)
1915 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1916 vc->vc_state = ESnormal;
1917 return;
1918 default:
1919 vc->vc_state = ESnormal;
1920 }
1921}
1922
1923/* This is a temporary buffer used to prepare a tty console write
1924 * so that we can easily avoid touching user space while holding the
1925 * console spinlock. It is allocated in con_init and is shared by
1926 * this code and the vc_screen read/write tty calls.
1927 *
1928 * We have to allocate this statically in the kernel data section
1929 * since console_init (and thus con_init) are called before any
1930 * kernel memory allocation is available.
1931 */
1932char con_buf[CON_BUF_SIZE];
1933DECLARE_MUTEX(con_buf_sem);
1934
2f1a2ccb
EK		 1935/* is_double_width() is based on the wcwidth() implementation by
1936 * Markus Kuhn -- 2003-05-20 (Unicode 4.0)
1937 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
1938 */
1939struct interval {
1940 uint32_t first;
1941 uint32_t last;
1942};
1943
1944static int bisearch(uint32_t ucs, const struct interval *table, int max)
1945{
1946 int min = 0;
1947 int mid;
1948
1949 if (ucs < table[0].first || ucs > table[max].last)
1950 return 0;
1951 while (max >= min) {
1952 mid = (min + max) / 2;
1953 if (ucs > table[mid].last)
1954 min = mid + 1;
1955 else if (ucs < table[mid].first)
1956 max = mid - 1;
1957 else
1958 return 1;
1959 }
1960 return 0;
1961}
1962
1963static int is_double_width(uint32_t ucs)
1964{
1965 static const struct interval double_width[] = {
1966 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
1967 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1968 { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, { 0xFFE0, 0xFFE6 },
1969 { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
1970 };
1971 return bisearch(ucs, double_width,
1972 sizeof(double_width) / sizeof(*double_width) - 1);
1973}
1974
1da177e4
LT		 1975/* acquires console_sem */
1976static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1977{
1978#ifdef VT_BUF_VRAM_ONLY
1979#define FLUSH do { } while(0);
1980#else
1981#define FLUSH if (draw_x >= 0) { \
1982 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1983 draw_x = -1; \
1984 }
1985#endif
1986
1987 int c, tc, ok, n = 0, draw_x = -1;
1988 unsigned int currcons;
1989 unsigned long draw_from = 0, draw_to = 0;
1990 struct vc_data *vc;
2f1a2ccb
EK		 1991 unsigned char vc_attr;
1992 uint8_t rescan;
1993 uint8_t inverse;
1994 uint8_t width;
1da177e4
LT		 1995 u16 himask, charmask;
1996 const unsigned char *orig_buf = NULL;
1997 int orig_count;
1998
1999 if (in_interrupt())
2000 return count;
2001
2002 might_sleep();
2003
2004 acquire_console_sem();
2005 vc = tty->driver_data;
2006 if (vc == NULL) {
2007 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2008 release_console_sem();
2009 return 0;
2010 }
2011
2012 currcons = vc->vc_num;
2013 if (!vc_cons_allocated(currcons)) {
2014 /* could this happen? */
2015 static int error = 0;
2016 if (!error) {
2017 error = 1;
2018 printk("con_write: tty %d not allocated\n", currcons+1);
2019 }
2020 release_console_sem();
2021 return 0;
2022 }
2023 release_console_sem();
2024
2025 orig_buf = buf;
2026 orig_count = count;
2027
2028 /* At this point 'buf' is guaranteed to be a kernel buffer
2029 * and therefore no access to userspace (and therefore sleeping)
2030 * will be needed. The con_buf_sem serializes all tty based
2031 * console rendering and vcs write/read operations. We hold
2032 * the console spinlock during the entire write.
2033 */
2034
2035 acquire_console_sem();
2036
2037 vc = tty->driver_data;
2038 if (vc == NULL) {
2039 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
2040 release_console_sem();
2041 goto out;
2042 }
2043
2044 himask = vc->vc_hi_font_mask;
2045 charmask = himask ? 0x1ff : 0xff;
2046
2047 /* undraw cursor first */
2048 if (IS_FG(vc))
2049 hide_cursor(vc);
2050
2051 while (!tty->stopped && count) {
2052 int orig = *buf;
2053 c = orig;
2054 buf++;
2055 n++;
2056 count--;
2f1a2ccb
EK		 2057 rescan = 0;
2058 inverse = 0;
2059 width = 1;
1da177e4
LT		 2060
2061 /* Do no translation at all in control states */
2062 if (vc->vc_state != ESnormal) {
2063 tc = c;
d4328b40 2064 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2065 /* Combine UTF-8 into Unicode in vc_utf_char.
2066 * vc_utf_count is the number of continuation bytes still
2067 * expected to arrive.
2068 * vc_npar is the number of continuation bytes arrived so
2069 * far
2070 */
d4328b40 2071rescan_last_byte:
2f1a2ccb
EK		 2072 if ((c & 0xc0) == 0x80) {
2073 /* Continuation byte received */
2074 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2075 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2076 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2077 vc->vc_npar++;
2078 if (--vc->vc_utf_count) {
2079 /* Still need some bytes */
1da177e4 2080 continue;
2f1a2ccb
EK		 2081 }
2082 /* Got a whole character */
2083 c = vc->vc_utf_char;
2084 /* Reject overlong sequences */
2085 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2086 c > utf8_length_changes[vc->vc_npar])
2087 c = 0xfffd;
2088 } else {
2089 /* Unexpected continuation byte */
2090 vc->vc_utf_count = 0;
2091 c = 0xfffd;
2092 }
1da177e4 2093 } else {
2f1a2ccb
EK		 2094 /* Single ASCII byte or first byte of a sequence received */
2095 if (vc->vc_utf_count) {
2096 /* Continuation byte expected */
2097 rescan = 1;
2098 vc->vc_utf_count = 0;
2099 c = 0xfffd;
2100 } else if (c > 0x7f) {
2101 /* First byte of a multibyte sequence received */
2102 vc->vc_npar = 0;
2103 if ((c & 0xe0) == 0xc0) {
2104 vc->vc_utf_count = 1;
2105 vc->vc_utf_char = (c & 0x1f);
2106 } else if ((c & 0xf0) == 0xe0) {
2107 vc->vc_utf_count = 2;
2108 vc->vc_utf_char = (c & 0x0f);
2109 } else if ((c & 0xf8) == 0xf0) {
2110 vc->vc_utf_count = 3;
2111 vc->vc_utf_char = (c & 0x07);
2112 } else if ((c & 0xfc) == 0xf8) {
2113 vc->vc_utf_count = 4;
2114 vc->vc_utf_char = (c & 0x03);
2115 } else if ((c & 0xfe) == 0xfc) {
2116 vc->vc_utf_count = 5;
2117 vc->vc_utf_char = (c & 0x01);
2118 } else {
2119 /* 254 and 255 are invalid */
2120 c = 0xfffd;
2121 }
2122 if (vc->vc_utf_count) {
2123 /* Still need some bytes */
2124 continue;
2125 }
2126 }
2127 /* Nothing to do if an ASCII byte was received */
1da177e4 2128 }
2f1a2ccb
EK		 2129 /* End of UTF-8 decoding. */
2130 /* c is the received character, or U+FFFD for invalid sequences. */
2131 /* Replace invalid Unicode code points with U+FFFD too */
2132 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2133 c = 0xfffd;
2134 tc = c;
d4328b40 2135 } else { /* no utf or alternate charset mode */
2f1a2ccb 2136 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
1da177e4
LT		 2137 }
2138
2139 /* If the original code was a control character we
2140 * only allow a glyph to be displayed if the code is
2141 * not normally used (such as for cursor movement) or
2142 * if the disp_ctrl mode has been explicitly enabled.
2143 * Certain characters (as given by the CTRL_ALWAYS
2144 * bitmap) are always displayed as control characters,
2145 * as the console would be pretty useless without
2146 * them; to display an arbitrary font position use the
2147 * direct-to-font zone in UTF-8 mode.
2148 */
2149 ok = tc && (c >= 32 ||
d4328b40
AT		 2150 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2151 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2152 && (c != 127 || vc->vc_disp_ctrl)
2153 && (c != 128+27);
2154
2155 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2156 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2157 if (is_double_width(c))
2158 width = 2;
2159 }
1da177e4
LT		 2160 /* Now try to find out how to display it */
2161 tc = conv_uni_to_pc(vc, tc);
d4328b40 2162 if (tc & ~charmask) {
2f1a2ccb
EK		 2163 if (tc == -1 || tc == -2) {
2164 continue; /* nothing to display */
2165 }
2166 /* Glyph not found */
2167 if (!(vc->vc_utf && !vc->vc_disp_ctrl) && !(c & ~charmask)) {
2168 /* In legacy mode use the glyph we get by a 1:1 mapping.
2169 This would make absolutely no sense with Unicode in mind. */
2170 tc = c;
2171 } else {
2172 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2173 tc = conv_uni_to_pc(vc, 0xfffd);
2174 if (tc < 0) {
2175 inverse = 1;
2176 tc = conv_uni_to_pc(vc, '?');
2177 if (tc < 0) tc = '?';
2178 }
2179 }
d4328b40 2180 }
1da177e4 2181
2f1a2ccb
EK		 2182 if (!inverse) {
2183 vc_attr = vc->vc_attr;
1da177e4 2184 } else {
2f1a2ccb
EK		 2185 /* invert vc_attr */
2186 if (!vc->vc_can_do_color) {
2187 vc_attr = (vc->vc_attr) ^ 0x08;
2188 } else if (vc->vc_hi_font_mask == 0x100) {
2189 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2190 } else {
2191 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2192 }
1da177e4 2193 }
2f1a2ccb
EK		 2194
2195 while (1) {
2196 if (vc->vc_need_wrap || vc->vc_decim)
2197 FLUSH
2198 if (vc->vc_need_wrap) {
2199 cr(vc);
2200 lf(vc);
2201 }
2202 if (vc->vc_decim)
2203 insert_char(vc, 1);
2204 scr_writew(himask ?
2205 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2206 (vc_attr << 8) + tc,
2207 (u16 *) vc->vc_pos);
2208 if (DO_UPDATE(vc) && draw_x < 0) {
2209 draw_x = vc->vc_x;
2210 draw_from = vc->vc_pos;
2211 }
2212 if (vc->vc_x == vc->vc_cols - 1) {
2213 vc->vc_need_wrap = vc->vc_decawm;
2214 draw_to = vc->vc_pos + 2;
2215 } else {
2216 vc->vc_x++;
2217 draw_to = (vc->vc_pos += 2);
d4328b40 2218 }
2f1a2ccb
EK		 2219
2220 if (!--width) break;
2221
2222 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2223 if (tc < 0) tc = ' ';
2224 }
2225
2226 if (rescan) {
2227 rescan = 0;
2228 inverse = 0;
2229 width = 1;
d4328b40
AT		 2230 c = orig;
2231 goto rescan_last_byte;
2232 }
1da177e4
LT		 2233 continue;
2234 }
2235 FLUSH
2236 do_con_trol(tty, vc, orig);
2237 }
2238 FLUSH
2239 console_conditional_schedule();
2240 release_console_sem();
2241
2242out:
2243 return n;
2244#undef FLUSH
2245}
2246
2247/*
2248 * This is the console switching callback.
2249 *
2250 * Doing console switching in a process context allows
2251 * us to do the switches asynchronously (needed when we want
2252 * to switch due to a keyboard interrupt). Synchronization
2253 * with other console code and prevention of re-entrancy is
2254 * ensured with console_sem.
2255 */
65f27f38 2256static void console_callback(struct work_struct *ignored)
1da177e4
LT		 2257{
2258 acquire_console_sem();
2259
2260 if (want_console >= 0) {
2261 if (want_console != fg_console &&
2262 vc_cons_allocated(want_console)) {
2263 hide_cursor(vc_cons[fg_console].d);
2264 change_console(vc_cons[want_console].d);
2265 /* we only changed when the console had already
2266 been allocated - a new console is not created
2267 in an interrupt routine */
2268 }
2269 want_console = -1;
2270 }
2271 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2272 do_poke_blanked_console = 0;
2273 poke_blanked_console();
2274 }
2275 if (scrollback_delta) {
2276 struct vc_data *vc = vc_cons[fg_console].d;
2277 clear_selection();
2278 if (vc->vc_mode == KD_TEXT)
2279 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2280 scrollback_delta = 0;
2281 }
2282 if (blank_timer_expired) {
2283 do_blank_screen(0);
2284 blank_timer_expired = 0;
2285 }
2286
2287 release_console_sem();
2288}
2289
b257bc05 2290int set_console(int nr)
1da177e4 2291{
b257bc05
AJ		 2292 struct vc_data *vc = vc_cons[fg_console].d;
2293
2294 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2295 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2296
2297 /*
2298 * Console switch will fail in console_callback() or
2299 * change_console() so there is no point scheduling
2300 * the callback
2301 *
2302 * Existing set_console() users don't check the return
2303 * value so this shouldn't break anything
2304 */
2305 return -EINVAL;
2306 }
2307
1da177e4
LT		 2308 want_console = nr;
2309 schedule_console_callback();
b257bc05
AJ		 2310
2311 return 0;
1da177e4
LT		 2312}
2313
2314struct tty_driver *console_driver;
2315
2316#ifdef CONFIG_VT_CONSOLE
2317
2318/*
2319 * Console on virtual terminal
2320 *
2321 * The console must be locked when we get here.
2322 */
2323
2324static void vt_console_print(struct console *co, const char *b, unsigned count)
2325{
2326 struct vc_data *vc = vc_cons[fg_console].d;
2327 unsigned char c;
2328 static unsigned long printing;
2329 const ushort *start;
2330 ushort cnt = 0;
2331 ushort myx;
2332
2333 /* console busy or not yet initialized */
2334 if (!printable || test_and_set_bit(0, &printing))
2335 return;
2336
2337 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2338 vc = vc_cons[kmsg_redirect - 1].d;
2339
2340 /* read `x' only after setting currcons properly (otherwise
2341 the `x' macro will read the x of the foreground console). */
2342 myx = vc->vc_x;
2343
2344 if (!vc_cons_allocated(fg_console)) {
2345 /* impossible */
2346 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2347 goto quit;
2348 }
2349
2350 if (vc->vc_mode != KD_TEXT)
2351 goto quit;
2352
2353 /* undraw cursor first */
2354 if (IS_FG(vc))
2355 hide_cursor(vc);
2356
2357 start = (ushort *)vc->vc_pos;
2358
2359 /* Contrived structure to try to emulate original need_wrap behaviour
2360 * Problems caused when we have need_wrap set on '\n' character */
2361 while (count--) {
2362 c = *b++;
2363 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2364 if (cnt > 0) {
2365 if (CON_IS_VISIBLE(vc))
2366 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2367 vc->vc_x += cnt;
2368 if (vc->vc_need_wrap)
2369 vc->vc_x--;
2370 cnt = 0;
2371 }
2372 if (c == 8) { /* backspace */
2373 bs(vc);
2374 start = (ushort *)vc->vc_pos;
2375 myx = vc->vc_x;
2376 continue;
2377 }
2378 if (c != 13)
2379 lf(vc);
2380 cr(vc);
2381 start = (ushort *)vc->vc_pos;
2382 myx = vc->vc_x;
2383 if (c == 10 || c == 13)
2384 continue;
2385 }
2386 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2387 cnt++;
2388 if (myx == vc->vc_cols - 1) {
2389 vc->vc_need_wrap = 1;
2390 continue;
2391 }
2392 vc->vc_pos += 2;
2393 myx++;
2394 }
2395 if (cnt > 0) {
2396 if (CON_IS_VISIBLE(vc))
2397 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2398 vc->vc_x += cnt;
2399 if (vc->vc_x == vc->vc_cols) {
2400 vc->vc_x--;
2401 vc->vc_need_wrap = 1;
2402 }
2403 }
2404 set_cursor(vc);
2405
2406quit:
2407 clear_bit(0, &printing);
2408}
2409
2410static struct tty_driver *vt_console_device(struct console *c, int *index)
2411{
2412 *index = c->index ? c->index-1 : fg_console;
2413 return console_driver;
2414}
2415
2416static struct console vt_console_driver = {
2417 .name = "tty",
2418 .write = vt_console_print,
2419 .device = vt_console_device,
2420 .unblank = unblank_screen,
2421 .flags = CON_PRINTBUFFER,
2422 .index = -1,
2423};
2424#endif
2425
2426/*
2427 * Handling of Linux-specific VC ioctls
2428 */
2429
2430/*
2431 * Generally a bit racy with respect to console_sem().
2432 *
2433 * There are some functions which don't need it.
2434 *
2435 * There are some functions which can sleep for arbitrary periods
2436 * (paste_selection) but we don't need the lock there anyway.
2437 *
2438 * set_selection has locking, and definitely needs it
2439 */
2440
2441int tioclinux(struct tty_struct *tty, unsigned long arg)
2442{
2443 char type, data;
2444 char __user *p = (char __user *)arg;
2445 int lines;
2446 int ret;
2447
2448 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2449 return -EINVAL;
2450 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2451 return -EPERM;
2452 if (get_user(type, p))
2453 return -EFAULT;
2454 ret = 0;
2455 switch (type)
2456 {
2457 case TIOCL_SETSEL:
2458 acquire_console_sem();
2459 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2460 release_console_sem();
2461 break;
2462 case TIOCL_PASTESEL:
2463 ret = paste_selection(tty);
2464 break;
2465 case TIOCL_UNBLANKSCREEN:
2d237c63 2466 acquire_console_sem();
1da177e4 2467 unblank_screen();
2d237c63 2468 release_console_sem();
1da177e4
LT		 2469 break;
2470 case TIOCL_SELLOADLUT:
2471 ret = sel_loadlut(p);
2472 break;
2473 case TIOCL_GETSHIFTSTATE:
2474
2475 /*
2476 * Make it possible to react to Shift+Mousebutton.
2477 * Note that 'shift_state' is an undocumented
2478 * kernel-internal variable; programs not closely
2479 * related to the kernel should not use this.
2480 */
2481 data = shift_state;
2482 ret = __put_user(data, p);
2483 break;
2484 case TIOCL_GETMOUSEREPORTING:
2485 data = mouse_reporting();
2486 ret = __put_user(data, p);
2487 break;
2488 case TIOCL_SETVESABLANK:
403aac96 2489 ret = set_vesa_blanking(p);
1da177e4 2490 break;
0ca07731
RW		 2491 case TIOCL_GETKMSGREDIRECT:
2492 data = kmsg_redirect;
2493 ret = __put_user(data, p);
2494 break;
1da177e4
LT		 2495 case TIOCL_SETKMSGREDIRECT:
2496 if (!capable(CAP_SYS_ADMIN)) {
2497 ret = -EPERM;
2498 } else {
2499 if (get_user(data, p+1))
2500 ret = -EFAULT;
2501 else
2502 kmsg_redirect = data;
2503 }
2504 break;
2505 case TIOCL_GETFGCONSOLE:
2506 ret = fg_console;
2507 break;
2508 case TIOCL_SCROLLCONSOLE:
2509 if (get_user(lines, (s32 __user *)(p+4))) {
2510 ret = -EFAULT;
2511 } else {
2512 scrollfront(vc_cons[fg_console].d, lines);
2513 ret = 0;
2514 }
2515 break;
2516 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2517 acquire_console_sem();
1da177e4
LT		 2518 ignore_poke = 1;
2519 do_blank_screen(0);
2d237c63 2520 release_console_sem();
1da177e4
LT		 2521 break;
2522 case TIOCL_BLANKEDSCREEN:
2523 ret = console_blanked;
2524 break;
2525 default:
2526 ret = -EINVAL;
2527 break;
2528 }
2529 return ret;
2530}
2531
2532/*
2533 * /dev/ttyN handling
2534 */
2535
2536static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2537{
2538 int retval;
2539
2540 retval = do_con_write(tty, buf, count);
2541 con_flush_chars(tty);
2542
2543 return retval;
2544}
2545
2546static void con_put_char(struct tty_struct *tty, unsigned char ch)
2547{
2548 if (in_interrupt())
2549 return; /* n_r3964 calls put_char() from interrupt context */
2550 do_con_write(tty, &ch, 1);
2551}
2552
2553static int con_write_room(struct tty_struct *tty)
2554{
2555 if (tty->stopped)
2556 return 0;
2557 return 4096; /* No limit, really; we're not buffering */
2558}
2559
2560static int con_chars_in_buffer(struct tty_struct *tty)
2561{
2562 return 0; /* we're not buffering */
2563}
2564
2565/*
2566 * con_throttle and con_unthrottle are only used for
2567 * paste_selection(), which has to stuff in a large number of
2568 * characters...
2569 */
2570static void con_throttle(struct tty_struct *tty)
2571{
2572}
2573
2574static void con_unthrottle(struct tty_struct *tty)
2575{
2576 struct vc_data *vc = tty->driver_data;
2577
2578 wake_up_interruptible(&vc->paste_wait);
2579}
2580
2581/*
2582 * Turn the Scroll-Lock LED on when the tty is stopped
2583 */
2584static void con_stop(struct tty_struct *tty)
2585{
2586 int console_num;
2587 if (!tty)
2588 return;
2589 console_num = tty->index;
2590 if (!vc_cons_allocated(console_num))
2591 return;
2592 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2593 set_leds();
2594}
2595
2596/*
2597 * Turn the Scroll-Lock LED off when the console is started
2598 */
2599static void con_start(struct tty_struct *tty)
2600{
2601 int console_num;
2602 if (!tty)
2603 return;
2604 console_num = tty->index;
2605 if (!vc_cons_allocated(console_num))
2606 return;
2607 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2608 set_leds();
2609}
2610
2611static void con_flush_chars(struct tty_struct *tty)
2612{
2613 struct vc_data *vc;
2614
2615 if (in_interrupt()) /* from flush_to_ldisc */
2616 return;
2617
2618 /* if we race with con_close(), vt may be null */
2619 acquire_console_sem();
2620 vc = tty->driver_data;
2621 if (vc)
2622 set_cursor(vc);
2623 release_console_sem();
2624}
2625
2626/*
2627 * Allocate the console screen memory.
2628 */
2629static int con_open(struct tty_struct *tty, struct file *filp)
2630{
2631 unsigned int currcons = tty->index;
2632 int ret = 0;
2633
2634 acquire_console_sem();
f786648b 2635 if (tty->driver_data == NULL) {
1da177e4
LT		 2636 ret = vc_allocate(currcons);
2637 if (ret == 0) {
2638 struct vc_data *vc = vc_cons[currcons].d;
2639 tty->driver_data = vc;
2640 vc->vc_tty = tty;
2641
2642 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2643 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2644 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2645 }
2646 release_console_sem();
d09d7ddf 2647 vcs_make_sysfs(tty);
1da177e4
LT		 2648 return ret;
2649 }
2650 }
2651 release_console_sem();
2652 return ret;
2653}
2654
2655/*
70522e12 2656 * We take tty_mutex in here to prevent another thread from coming in via init_dev
1da177e4
LT		 2657 * and taking a ref against the tty while we're in the process of forgetting
2658 * about it and cleaning things up.
2659 *
d09d7ddf 2660 * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
1da177e4
LT		 2661 */
2662static void con_close(struct tty_struct *tty, struct file *filp)
2663{
70522e12 2664 mutex_lock(&tty_mutex);
1da177e4
LT		 2665 acquire_console_sem();
2666 if (tty && tty->count == 1) {
2667 struct vc_data *vc = tty->driver_data;
2668
2669 if (vc)
2670 vc->vc_tty = NULL;
2671 tty->driver_data = NULL;
2672 release_console_sem();
d09d7ddf 2673 vcs_remove_sysfs(tty);
70522e12 2674 mutex_unlock(&tty_mutex);
1da177e4 2675 /*
70522e12 2676 * tty_mutex is released, but we still hold BKL, so there is
1da177e4
LT		 2677 * still exclusion against init_dev()
2678 */
2679 return;
2680 }
2681 release_console_sem();
70522e12 2682 mutex_unlock(&tty_mutex);
1da177e4
LT		 2683}
2684
2685static void vc_init(struct vc_data *vc, unsigned int rows,
2686 unsigned int cols, int do_clear)
2687{
2688 int j, k ;
2689
2690 vc->vc_cols = cols;
2691 vc->vc_rows = rows;
2692 vc->vc_size_row = cols << 1;
2693 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2694
2695 set_origin(vc);
2696 vc->vc_pos = vc->vc_origin;
2697 reset_vc(vc);
2698 for (j=k=0; j<16; j++) {
2699 vc->vc_palette[k++] = default_red[j] ;
2700 vc->vc_palette[k++] = default_grn[j] ;
2701 vc->vc_palette[k++] = default_blu[j] ;
2702 }
2703 vc->vc_def_color = 0x07; /* white */
2704 vc->vc_ulcolor = 0x0f; /* bold white */
2705 vc->vc_halfcolor = 0x08; /* grey */
2706 init_waitqueue_head(&vc->paste_wait);
2707 reset_terminal(vc, do_clear);
2708}
2709
2710/*
2711 * This routine initializes console interrupts, and does nothing
2712 * else. If you want the screen to clear, call tty_write with
2713 * the appropriate escape-sequence.
2714 */
2715
2716static int __init con_init(void)
2717{
2718 const char *display_desc = NULL;
2719 struct vc_data *vc;
3e795de7 2720 unsigned int currcons = 0, i;
1da177e4
LT		 2721
2722 acquire_console_sem();
2723
2724 if (conswitchp)
2725 display_desc = conswitchp->con_startup();
2726 if (!display_desc) {
2727 fg_console = 0;
2728 release_console_sem();
2729 return 0;
2730 }
2731
3e795de7
AD		 2732 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2733 struct con_driver *con_driver = &registered_con_driver[i];
2734
2735 if (con_driver->con == NULL) {
2736 con_driver->con = conswitchp;
2737 con_driver->desc = display_desc;
2738 con_driver->flag = CON_DRIVER_FLAG_INIT;
2739 con_driver->first = 0;
2740 con_driver->last = MAX_NR_CONSOLES - 1;
2741 break;
2742 }
2743 }
2744
2745 for (i = 0; i < MAX_NR_CONSOLES; i++)
2746 con_driver_map[i] = conswitchp;
2747
1da177e4
LT		 2748 if (blankinterval) {
2749 blank_state = blank_normal_wait;
2750 mod_timer(&console_timer, jiffies + blankinterval);
2751 }
2752
2753 /*
2754 * kmalloc is not running yet - we use the bootmem allocator.
2755 */
2756 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2757 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
7f1f86a0 2758 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 2759 visual_init(vc, currcons, 1);
2760 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2761 vc->vc_kmalloced = 0;
2762 vc_init(vc, vc->vc_rows, vc->vc_cols,
2763 currcons || !vc->vc_sw->con_save_screen);
2764 }
2765 currcons = fg_console = 0;
2766 master_display_fg = vc = vc_cons[currcons].d;
2767 set_origin(vc);
2768 save_screen(vc);
2769 gotoxy(vc, vc->vc_x, vc->vc_y);
2770 csi_J(vc, 0);
2771 update_screen(vc);
2772 printk("Console: %s %s %dx%d",
2773 vc->vc_can_do_color ? "colour" : "mono",
2774 display_desc, vc->vc_cols, vc->vc_rows);
2775 printable = 1;
2776 printk("\n");
2777
2778 release_console_sem();
2779
2780#ifdef CONFIG_VT_CONSOLE
2781 register_console(&vt_console_driver);
2782#endif
2783 return 0;
2784}
2785console_initcall(con_init);
2786
b68e31d0 2787static const struct tty_operations con_ops = {
1da177e4
LT		 2788 .open = con_open,
2789 .close = con_close,
2790 .write = con_write,
2791 .write_room = con_write_room,
2792 .put_char = con_put_char,
2793 .flush_chars = con_flush_chars,
2794 .chars_in_buffer = con_chars_in_buffer,
2795 .ioctl = vt_ioctl,
2796 .stop = con_stop,
2797 .start = con_start,
2798 .throttle = con_throttle,
2799 .unthrottle = con_unthrottle,
2800};
2801
2802int __init vty_init(void)
2803{
2804 vcs_init();
2805
2806 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2807 if (!console_driver)
2808 panic("Couldn't allocate console driver\n");
2809 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2810 console_driver->name = "tty";
2811 console_driver->name_base = 1;
2812 console_driver->major = TTY_MAJOR;
2813 console_driver->minor_start = 1;
2814 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2815 console_driver->init_termios = tty_std_termios;
2816 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2817 tty_set_operations(console_driver, &con_ops);
2818 if (tty_register_driver(console_driver))
2819 panic("Couldn't register console driver\n");
2820
2821 kbd_init();
2822 console_map_init();
2823#ifdef CONFIG_PROM_CONSOLE
2824 prom_con_init();
2825#endif
2826#ifdef CONFIG_MDA_CONSOLE
2827 mda_console_init();
2828#endif
2829 return 0;
2830}
2831
2832#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 2833#include <linux/device.h>
2834
2835static struct class *vtconsole_class;
2836
3e795de7
AD		 2837static int bind_con_driver(const struct consw *csw, int first, int last,
2838 int deflt)
1da177e4 2839{
3e795de7
AD		 2840 struct module *owner = csw->owner;
2841 const char *desc = NULL;
2842 struct con_driver *con_driver;
2843 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2844
1da177e4
LT		 2845 if (!try_module_get(owner))
2846 return -ENODEV;
2847
1c8ce271 2848 acquire_console_sem();
1c8ce271 2849
3e795de7
AD		 2850 /* check if driver is registered */
2851 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2852 con_driver = &registered_con_driver[i];
2853
2854 if (con_driver->con == csw) {
2855 desc = con_driver->desc;
2856 retval = 0;
2857 break;
2858 }
2859 }
2860
2861 if (retval)
2862 goto err;
2863
2864 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2865 csw->con_startup();
2866 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 2867 }
1c8ce271 2868
1da177e4
LT		 2869 if (deflt) {
2870 if (conswitchp)
2871 module_put(conswitchp->owner);
1c8ce271 2872
1da177e4
LT		 2873 __module_get(owner);
2874 conswitchp = csw;
2875 }
2876
3e795de7
AD		 2877 first = max(first, con_driver->first);
2878 last = min(last, con_driver->last);
2879
1da177e4
LT		 2880 for (i = first; i <= last; i++) {
2881 int old_was_color;
2882 struct vc_data *vc = vc_cons[i].d;
2883
2884 if (con_driver_map[i])
2885 module_put(con_driver_map[i]->owner);
2886 __module_get(owner);
2887 con_driver_map[i] = csw;
2888
2889 if (!vc || !vc->vc_sw)
2890 continue;
2891
2892 j = i;
1c8ce271 2893
4ee1acce
DH		 2894 if (CON_IS_VISIBLE(vc)) {
2895 k = i;
1da177e4 2896 save_screen(vc);
4ee1acce
DH		 2897 }
2898
1da177e4
LT		 2899 old_was_color = vc->vc_can_do_color;
2900 vc->vc_sw->con_deinit(vc);
2901 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 2902 visual_init(vc, i, 0);
1c8ce271 2903 set_origin(vc);
1da177e4
LT		 2904 update_attr(vc);
2905
2906 /* If the console changed between mono <-> color, then
2907 * the attributes in the screenbuf will be wrong. The
2908 * following resets all attributes to something sane.
2909 */
2910 if (old_was_color != vc->vc_can_do_color)
2911 clear_buffer_attributes(vc);
1da177e4 2912 }
4ee1acce 2913
1da177e4
LT		 2914 printk("Console: switching ");
2915 if (!deflt)
2916 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 2917 if (j >= 0) {
2918 struct vc_data *vc = vc_cons[j].d;
2919
1da177e4 2920 printk("to %s %s %dx%d\n",
4ee1acce
DH		 2921 vc->vc_can_do_color ? "colour" : "mono",
2922 desc, vc->vc_cols, vc->vc_rows);
2923
2924 if (k >= 0) {
2925 vc = vc_cons[k].d;
2926 update_screen(vc);
2927 }
2928 } else
1da177e4
LT		 2929 printk("to %s\n", desc);
2930
3e795de7
AD		 2931 retval = 0;
2932err:
1da177e4 2933 release_console_sem();
1da177e4 2934 module_put(owner);
3e795de7
AD		 2935 return retval;
2936};
1da177e4 2937
13ae6645
AD		 2938#ifdef CONFIG_VT_HW_CONSOLE_BINDING
2939static int con_is_graphics(const struct consw *csw, int first, int last)
2940{
2941 int i, retval = 0;
2942
2943 for (i = first; i <= last; i++) {
2944 struct vc_data *vc = vc_cons[i].d;
2945
2946 if (vc && vc->vc_mode == KD_GRAPHICS) {
2947 retval = 1;
2948 break;
2949 }
2950 }
2951
2952 return retval;
2953}
2954
3e795de7
AD		 2955static int unbind_con_driver(const struct consw *csw, int first, int last,
2956 int deflt)
1da177e4 2957{
3e795de7
AD		 2958 struct module *owner = csw->owner;
2959 const struct consw *defcsw = NULL;
2960 struct con_driver *con_driver = NULL, *con_back = NULL;
2961 int i, retval = -ENODEV;
1da177e4 2962
3e795de7
AD		 2963 if (!try_module_get(owner))
2964 return -ENODEV;
2965
2966 acquire_console_sem();
2967
2968 /* check if driver is registered and if it is unbindable */
2969 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2970 con_driver = &registered_con_driver[i];
2971
2972 if (con_driver->con == csw &&
6db4063c 2973 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 2974 retval = 0;
2975 break;
2976 }
2977 }
2978
2979 if (retval) {
2980 release_console_sem();
2981 goto err;
2982 }
2983
6db4063c
AD		 2984 retval = -ENODEV;
2985
3e795de7
AD		 2986 /* check if backup driver exists */
2987 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2988 con_back = &registered_con_driver[i];
2989
2990 if (con_back->con &&
6db4063c 2991 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 2992 defcsw = con_back->con;
2993 retval = 0;
2994 break;
2995 }
2996 }
2997
2998 if (retval) {
2999 release_console_sem();
3000 goto err;
3001 }
3002
3003 if (!con_is_bound(csw)) {
3004 release_console_sem();
3005 goto err;
3006 }
3007
3008 first = max(first, con_driver->first);
3009 last = min(last, con_driver->last);
3010
3011 for (i = first; i <= last; i++) {
1da177e4
LT		 3012 if (con_driver_map[i] == csw) {
3013 module_put(csw->owner);
3014 con_driver_map[i] = NULL;
3015 }
3e795de7
AD		 3016 }
3017
3018 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3019 const struct consw *defconsw = conswitchp;
3020
3e795de7
AD		 3021 defcsw->con_startup();
3022 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3023 /*
3024 * vgacon may change the default driver to point
3025 * to dummycon, we restore it here...
3026 */
3027 conswitchp = defconsw;
3e795de7
AD		 3028 }
3029
3030 if (!con_is_bound(csw))
3031 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3032
3033 release_console_sem();
6db4063c
AD		 3034 /* ignore return value, binding should not fail */
3035 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3036err:
3037 module_put(owner);
3038 return retval;
3039
3040}
3041
6db4063c
AD		 3042static int vt_bind(struct con_driver *con)
3043{
3044 const struct consw *defcsw = NULL, *csw = NULL;
3045 int i, more = 1, first = -1, last = -1, deflt = 0;
3046
3047 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3048 con_is_graphics(con->con, con->first, con->last))
3049 goto err;
3050
3051 csw = con->con;
3052
3053 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3054 struct con_driver *con = &registered_con_driver[i];
3055
3056 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3057 defcsw = con->con;
3058 break;
3059 }
3060 }
3061
3062 if (!defcsw)
3063 goto err;
3064
3065 while (more) {
3066 more = 0;
3067
3068 for (i = con->first; i <= con->last; i++) {
3069 if (con_driver_map[i] == defcsw) {
3070 if (first == -1)
3071 first = i;
3072 last = i;
3073 more = 1;
3074 } else if (first != -1)
3075 break;
3076 }
3077
3078 if (first == 0 && last == MAX_NR_CONSOLES -1)
3079 deflt = 1;
3080
3081 if (first != -1)
3082 bind_con_driver(csw, first, last, deflt);
3083
3084 first = -1;
3085 last = -1;
3086 deflt = 0;
3087 }
3088
3089err:
3090 return 0;
3091}
3092
3093static int vt_unbind(struct con_driver *con)
3094{
3095 const struct consw *csw = NULL;
3096 int i, more = 1, first = -1, last = -1, deflt = 0;
3097
3098 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3099 con_is_graphics(con->con, con->first, con->last))
3100 goto err;
3101
3102 csw = con->con;
3103
3104 while (more) {
3105 more = 0;
3106
3107 for (i = con->first; i <= con->last; i++) {
3108 if (con_driver_map[i] == csw) {
3109 if (first == -1)
3110 first = i;
3111 last = i;
3112 more = 1;
3113 } else if (first != -1)
3114 break;
3115 }
3116
3117 if (first == 0 && last == MAX_NR_CONSOLES -1)
3118 deflt = 1;
3119
3120 if (first != -1)
3121 unbind_con_driver(csw, first, last, deflt);
3122
3123 first = -1;
3124 last = -1;
3125 deflt = 0;
3126 }
3127
3128err:
3129 return 0;
3130}
13ae6645
AD		 3131#else
3132static inline int vt_bind(struct con_driver *con)
3133{
3134 return 0;
3135}
3136static inline int vt_unbind(struct con_driver *con)
3137{
3138 return 0;
3139}
3140#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3141
805952a8 3142static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3143 const char *buf, size_t count)
3144{
805952a8 3145 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3146 int bind = simple_strtoul(buf, NULL, 0);
3147
3148 if (bind)
3149 vt_bind(con);
3150 else
3151 vt_unbind(con);
3152
3153 return count;
3154}
3155
805952a8
GKH		 3156static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3157 char *buf)
6db4063c 3158{
805952a8 3159 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3160 int bind = con_is_bound(con->con);
3161
3162 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3163}
3164
805952a8
GKH		 3165static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3166 char *buf)
6db4063c 3167{
805952a8 3168 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3169
3170 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3171 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3172 con->desc);
3173
3174}
3175
805952a8 3176static struct device_attribute device_attrs[] = {
6db4063c
AD		 3177 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3178 __ATTR(name, S_IRUGO, show_name, NULL),
3179};
3180
805952a8 3181static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3182{
3183 int i;
928e964f 3184 int error = 0;
6db4063c 3185
928e964f 3186 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3187 dev_set_drvdata(con->dev, con);
3188 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3189 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3190 if (error)
3191 break;
3192 }
6db4063c 3193
928e964f
AD		 3194 if (error) {
3195 while (--i >= 0)
805952a8 3196 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3197 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3198 }
3199
3200 return error;
6db4063c
AD		 3201}
3202
805952a8 3203static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3204{
3205 int i;
3206
928e964f 3207 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3208 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3209 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3210 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3211 }
6db4063c
AD		 3212}
3213
3e795de7
AD		 3214/**
3215 * con_is_bound - checks if driver is bound to the console
3216 * @csw: console driver
3217 *
3218 * RETURNS: zero if unbound, nonzero if bound
3219 *
3220 * Drivers can call this and if zero, they should release
3221 * all resources allocated on con_startup()
3222 */
3223int con_is_bound(const struct consw *csw)
3224{
3225 int i, bound = 0;
3226
3227 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3228 if (con_driver_map[i] == csw) {
3229 bound = 1;
3230 break;
3231 }
3232 }
3233
3234 return bound;
3235}
3236EXPORT_SYMBOL(con_is_bound);
3237
3238/**
3239 * register_con_driver - register console driver to console layer
3240 * @csw: console driver
3241 * @first: the first console to take over, minimum value is 0
3242 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3243 *
3244 * DESCRIPTION: This function registers a console driver which can later
3245 * bind to a range of consoles specified by @first and @last. It will
3246 * also initialize the console driver by calling con_startup().
3247 */
3248int register_con_driver(const struct consw *csw, int first, int last)
3249{
3250 struct module *owner = csw->owner;
3251 struct con_driver *con_driver;
3252 const char *desc;
3253 int i, retval = 0;
3254
3255 if (!try_module_get(owner))
3256 return -ENODEV;
3257
3258 acquire_console_sem();
3259
3260 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3261 con_driver = &registered_con_driver[i];
3262
3263 /* already registered */
3264 if (con_driver->con == csw)
3265 retval = -EINVAL;
3266 }
3267
3268 if (retval)
3269 goto err;
3270
3271 desc = csw->con_startup();
3272
3273 if (!desc)
3274 goto err;
3275
3276 retval = -EINVAL;
3277
3278 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3279 con_driver = &registered_con_driver[i];
3280
3281 if (con_driver->con == NULL) {
3282 con_driver->con = csw;
3283 con_driver->desc = desc;
6db4063c
AD		 3284 con_driver->node = i;
3285 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3286 CON_DRIVER_FLAG_INIT;
3287 con_driver->first = first;
3288 con_driver->last = last;
3289 retval = 0;
3290 break;
3291 }
3292 }
3293
6db4063c
AD		 3294 if (retval)
3295 goto err;
3296
805952a8
GKH		 3297 con_driver->dev = device_create(vtconsole_class, NULL,
3298 MKDEV(0, con_driver->node),
3299 "vtcon%i", con_driver->node);
6db4063c 3300
805952a8
GKH		 3301 if (IS_ERR(con_driver->dev)) {
3302 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3303 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3304 PTR_ERR(con_driver->dev));
3305 con_driver->dev = NULL;
6db4063c 3306 } else {
805952a8 3307 vtconsole_init_device(con_driver);
6db4063c 3308 }
928e964f 3309
3e795de7
AD		 3310err:
3311 release_console_sem();
3312 module_put(owner);
3313 return retval;
3314}
3315EXPORT_SYMBOL(register_con_driver);
3316
3317/**
3318 * unregister_con_driver - unregister console driver from console layer
3319 * @csw: console driver
3320 *
3321 * DESCRIPTION: All drivers that registers to the console layer must
3322 * call this function upon exit, or if the console driver is in a state
3323 * where it won't be able to handle console services, such as the
3324 * framebuffer console without loaded framebuffer drivers.
3325 *
3326 * The driver must unbind first prior to unregistration.
3327 */
3328int unregister_con_driver(const struct consw *csw)
3329{
3330 int i, retval = -ENODEV;
3331
3332 acquire_console_sem();
3333
3334 /* cannot unregister a bound driver */
3335 if (con_is_bound(csw))
3336 goto err;
3337
3338 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3339 struct con_driver *con_driver = &registered_con_driver[i];
3340
3341 if (con_driver->con == csw &&
6db4063c 3342 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3343 vtconsole_deinit_device(con_driver);
3344 device_destroy(vtconsole_class,
3345 MKDEV(0, con_driver->node));
3e795de7
AD		 3346 con_driver->con = NULL;
3347 con_driver->desc = NULL;
805952a8 3348 con_driver->dev = NULL;
6db4063c 3349 con_driver->node = 0;
3e795de7
AD		 3350 con_driver->flag = 0;
3351 con_driver->first = 0;
3352 con_driver->last = 0;
3353 retval = 0;
3354 break;
3355 }
3356 }
3e795de7
AD		 3357err:
3358 release_console_sem();
3359 return retval;
3360}
3361EXPORT_SYMBOL(unregister_con_driver);
3362
3363/*
3364 * If we support more console drivers, this function is used
3365 * when a driver wants to take over some existing consoles
3366 * and become default driver for newly opened ones.
3367 *
3368 * take_over_console is basically a register followed by unbind
3369 */
3370int take_over_console(const struct consw *csw, int first, int last, int deflt)
3371{
3372 int err;
3373
3374 err = register_con_driver(csw, first, last);
3375
3376 if (!err)
6db4063c 3377 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3378
3379 return err;
3380}
3381
3382/*
3383 * give_up_console is a wrapper to unregister_con_driver. It will only
3384 * work if driver is fully unbound.
3385 */
3386void give_up_console(const struct consw *csw)
3387{
3388 unregister_con_driver(csw);
3389}
3390
6db4063c 3391static int __init vtconsole_class_init(void)
3e795de7 3392{
6db4063c 3393 int i;
3e795de7 3394
6db4063c
AD		 3395 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3396 if (IS_ERR(vtconsole_class)) {
3397 printk(KERN_WARNING "Unable to create vt console class; "
3398 "errno = %ld\n", PTR_ERR(vtconsole_class));
3399 vtconsole_class = NULL;
3400 }
3e795de7 3401
6db4063c 3402 /* Add system drivers to sysfs */
3e795de7
AD		 3403 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3404 struct con_driver *con = &registered_con_driver[i];
3405
805952a8
GKH		 3406 if (con->con && !con->dev) {
3407 con->dev = device_create(vtconsole_class, NULL,
3408 MKDEV(0, con->node),
3409 "vtcon%i", con->node);
6db4063c 3410
805952a8 3411 if (IS_ERR(con->dev)) {
6db4063c 3412 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3413 "device for %s; errno = %ld\n",
3414 con->desc, PTR_ERR(con->dev));
3415 con->dev = NULL;
6db4063c 3416 } else {
805952a8 3417 vtconsole_init_device(con);
6db4063c 3418 }
3e795de7 3419 }
3e795de7
AD		 3420 }
3421
3e795de7
AD		 3422 return 0;
3423}
6db4063c 3424postcore_initcall(vtconsole_class_init);
3e795de7 3425
1da177e4
LT		 3426#endif
3427
3428/*
3429 * Screen blanking
3430 */
3431
403aac96 3432static int set_vesa_blanking(char __user *p)
1da177e4 3433{
403aac96
YY		 3434 unsigned int mode;
3435
3436 if (get_user(mode, p + 1))
3437 return -EFAULT;
3438
3439 vesa_blank_mode = (mode < 4) ? mode : 0;
3440 return 0;
1da177e4
LT		 3441}
3442
1da177e4
LT		 3443void do_blank_screen(int entering_gfx)
3444{
3445 struct vc_data *vc = vc_cons[fg_console].d;
3446 int i;
3447
3448 WARN_CONSOLE_UNLOCKED();
3449
3450 if (console_blanked) {
3451 if (blank_state == blank_vesa_wait) {
3452 blank_state = blank_off;
d060a321 3453 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3454 }
3455 return;
3456 }
3457 if (blank_state != blank_normal_wait)
3458 return;
3459 blank_state = blank_off;
3460
3461 /* entering graphics mode? */
3462 if (entering_gfx) {
3463 hide_cursor(vc);
3464 save_screen(vc);
3465 vc->vc_sw->con_blank(vc, -1, 1);
3466 console_blanked = fg_console + 1;
3467 set_origin(vc);
3468 return;
3469 }
3470
3471 /* don't blank graphics */
3472 if (vc->vc_mode != KD_TEXT) {
3473 console_blanked = fg_console + 1;
3474 return;
3475 }
3476
3477 hide_cursor(vc);
3478 del_timer_sync(&console_timer);
3479 blank_timer_expired = 0;
3480
3481 save_screen(vc);
3482 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3483 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3484 console_blanked = fg_console + 1;
3485 if (i)
3486 set_origin(vc);
3487
3488 if (console_blank_hook && console_blank_hook(1))
3489 return;
3490
d060a321 3491 if (vesa_off_interval && vesa_blank_mode) {
030babac 3492 blank_state = blank_vesa_wait;
1da177e4
LT		 3493 mod_timer(&console_timer, jiffies + vesa_off_interval);
3494 }
1da177e4
LT		 3495}
3496EXPORT_SYMBOL(do_blank_screen);
3497
3498/*
3499 * Called by timer as well as from vt_console_driver
3500 */
3501void do_unblank_screen(int leaving_gfx)
3502{
3503 struct vc_data *vc;
3504
3505 /* This should now always be called from a "sane" (read: can schedule)
3506 * context for the sake of the low level drivers, except in the special
3507 * case of oops_in_progress
3508 */
3509 if (!oops_in_progress)
3510 might_sleep();
3511
3512 WARN_CONSOLE_UNLOCKED();
3513
3514 ignore_poke = 0;
3515 if (!console_blanked)
3516 return;
3517 if (!vc_cons_allocated(fg_console)) {
3518 /* impossible */
3519 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3520 return;
3521 }
3522 vc = vc_cons[fg_console].d;
3523 if (vc->vc_mode != KD_TEXT)
3524 return; /* but leave console_blanked != 0 */
3525
3526 if (blankinterval) {
3527 mod_timer(&console_timer, jiffies + blankinterval);
3528 blank_state = blank_normal_wait;
3529 }
3530
3531 console_blanked = 0;
3532 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3533 /* Low-level driver cannot restore -> do it ourselves */
3534 update_screen(vc);
3535 if (console_blank_hook)
3536 console_blank_hook(0);
3537 set_palette(vc);
3538 set_cursor(vc);
3539}
3540EXPORT_SYMBOL(do_unblank_screen);
3541
3542/*
3543 * This is called by the outside world to cause a forced unblank, mostly for
3544 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3545 * call it with 1 as an argument and so force a mode restore... that may kill
3546 * X or at least garbage the screen but would also make the Oops visible...
3547 */
3548void unblank_screen(void)
3549{
3550 do_unblank_screen(0);
3551}
3552
3553/*
70522e12 3554 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3555 * (console operations can still happen at irq time, but only from printk which
70522e12 3556 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3557 */
3558static void blank_screen_t(unsigned long dummy)
3559{
cc63b1e1
JB		 3560 if (unlikely(!keventd_up())) {
3561 mod_timer(&console_timer, jiffies + blankinterval);
3562 return;
3563 }
1da177e4
LT		 3564 blank_timer_expired = 1;
3565 schedule_work(&console_work);
3566}
3567
3568void poke_blanked_console(void)
3569{
3570 WARN_CONSOLE_UNLOCKED();
3571
3572 /* Add this so we quickly catch whoever might call us in a non
3573 * safe context. Nowadays, unblank_screen() isn't to be called in
3574 * atomic contexts and is allowed to schedule (with the special case
3575 * of oops_in_progress, but that isn't of any concern for this
3576 * function. --BenH.
3577 */
3578 might_sleep();
3579
3580 /* This isn't perfectly race free, but a race here would be mostly harmless,
3581 * at worse, we'll do a spurrious blank and it's unlikely
3582 */
3583 del_timer(&console_timer);
3584 blank_timer_expired = 0;
3585
3586 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3587 return;
3588 if (console_blanked)
3589 unblank_screen();
3590 else if (blankinterval) {
3591 mod_timer(&console_timer, jiffies + blankinterval);
3592 blank_state = blank_normal_wait;
3593 }
3594}
3595
3596/*
3597 * Palettes
3598 */
3599
3600static void set_palette(struct vc_data *vc)
3601{
3602 WARN_CONSOLE_UNLOCKED();
3603
3604 if (vc->vc_mode != KD_GRAPHICS)
3605 vc->vc_sw->con_set_palette(vc, color_table);
3606}
3607
3608static int set_get_cmap(unsigned char __user *arg, int set)
3609{
3610 int i, j, k;
3611
3612 WARN_CONSOLE_UNLOCKED();
3613
3614 for (i = 0; i < 16; i++)
3615 if (set) {
3616 get_user(default_red[i], arg++);
3617 get_user(default_grn[i], arg++);
3618 get_user(default_blu[i], arg++);
3619 } else {
3620 put_user(default_red[i], arg++);
3621 put_user(default_grn[i], arg++);
3622 put_user(default_blu[i], arg++);
3623 }
3624 if (set) {
3625 for (i = 0; i < MAX_NR_CONSOLES; i++)
3626 if (vc_cons_allocated(i)) {
3627 for (j = k = 0; j < 16; j++) {
3628 vc_cons[i].d->vc_palette[k++] = default_red[j];
3629 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3630 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3631 }
3632 set_palette(vc_cons[i].d);
3633 }
3634 }
3635 return 0;
3636}
3637
3638/*
3639 * Load palette into the DAC registers. arg points to a colour
3640 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3641 */
3642
3643int con_set_cmap(unsigned char __user *arg)
3644{
3645 int rc;
3646
3647 acquire_console_sem();
3648 rc = set_get_cmap (arg,1);
3649 release_console_sem();
3650
3651 return rc;
3652}
3653
3654int con_get_cmap(unsigned char __user *arg)
3655{
3656 int rc;
3657
3658 acquire_console_sem();
3659 rc = set_get_cmap (arg,0);
3660 release_console_sem();
3661
3662 return rc;
3663}
3664
3665void reset_palette(struct vc_data *vc)
3666{
3667 int j, k;
3668 for (j=k=0; j<16; j++) {
3669 vc->vc_palette[k++] = default_red[j];
3670 vc->vc_palette[k++] = default_grn[j];
3671 vc->vc_palette[k++] = default_blu[j];
3672 }
3673 set_palette(vc);
3674}
3675
3676/*
3677 * Font switching
3678 *
3679 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3680 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3681 * depending on width) reserved for each character which is kinda wasty, but
3682 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3683 * is upto the actual low-level console-driver convert data into its favorite
3684 * format (maybe we should add a `fontoffset' field to the `display'
3685 * structure so we won't have to convert the fontdata all the time.
3686 * /Jes
3687 */
3688
3689#define max_font_size 65536
3690
3691static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3692{
3693 struct console_font font;
3694 int rc = -EINVAL;
3695 int c;
3696
3697 if (vc->vc_mode != KD_TEXT)
3698 return -EINVAL;
3699
3700 if (op->data) {
3701 font.data = kmalloc(max_font_size, GFP_KERNEL);
3702 if (!font.data)
3703 return -ENOMEM;
3704 } else
3705 font.data = NULL;
3706
3707 acquire_console_sem();
3708 if (vc->vc_sw->con_font_get)
3709 rc = vc->vc_sw->con_font_get(vc, &font);
3710 else
3711 rc = -ENOSYS;
3712 release_console_sem();
3713
3714 if (rc)
3715 goto out;
3716
3717 c = (font.width+7)/8 * 32 * font.charcount;
3718
3719 if (op->data && font.charcount > op->charcount)
3720 rc = -ENOSPC;
3721 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3722 if (font.width > op->width || font.height > op->height)
3723 rc = -ENOSPC;
3724 } else {
3725 if (font.width != 8)
3726 rc = -EIO;
3727 else if ((op->height && font.height > op->height) ||
3728 font.height > 32)
3729 rc = -ENOSPC;
3730 }
3731 if (rc)
3732 goto out;
3733
3734 op->height = font.height;
3735 op->width = font.width;
3736 op->charcount = font.charcount;
3737
3738 if (op->data && copy_to_user(op->data, font.data, c))
3739 rc = -EFAULT;
3740
3741out:
3742 kfree(font.data);
3743 return rc;
3744}
3745
3746static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3747{
3748 struct console_font font;
3749 int rc = -EINVAL;
3750 int size;
3751
3752 if (vc->vc_mode != KD_TEXT)
3753 return -EINVAL;
3754 if (!op->data)
3755 return -EINVAL;
3756 if (op->charcount > 512)
3757 return -EINVAL;
3758 if (!op->height) { /* Need to guess font height [compat] */
3759 int h, i;
3760 u8 __user *charmap = op->data;
3761 u8 tmp;
3762
3763 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3764 so that we can get rid of this soon */
3765 if (!(op->flags & KD_FONT_FLAG_OLD))
3766 return -EINVAL;
3767 for (h = 32; h > 0; h--)
3768 for (i = 0; i < op->charcount; i++) {
3769 if (get_user(tmp, &charmap[32*i+h-1]))
3770 return -EFAULT;
3771 if (tmp)
3772 goto nonzero;
3773 }
3774 return -EINVAL;
3775 nonzero:
3776 op->height = h;
3777 }
3778 if (op->width <= 0 || op->width > 32 || op->height > 32)
3779 return -EINVAL;
3780 size = (op->width+7)/8 * 32 * op->charcount;
3781 if (size > max_font_size)
3782 return -ENOSPC;
3783 font.charcount = op->charcount;
3784 font.height = op->height;
3785 font.width = op->width;
3786 font.data = kmalloc(size, GFP_KERNEL);
3787 if (!font.data)
3788 return -ENOMEM;
3789 if (copy_from_user(font.data, op->data, size)) {
3790 kfree(font.data);
3791 return -EFAULT;
3792 }
3793 acquire_console_sem();
3794 if (vc->vc_sw->con_font_set)
3795 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3796 else
3797 rc = -ENOSYS;
3798 release_console_sem();
3799 kfree(font.data);
3800 return rc;
3801}
3802
3803static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3804{
3805 struct console_font font = {.width = op->width, .height = op->height};
3806 char name[MAX_FONT_NAME];
3807 char *s = name;
3808 int rc;
3809
3810 if (vc->vc_mode != KD_TEXT)
3811 return -EINVAL;
3812
3813 if (!op->data)
3814 s = NULL;
3815 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3816 return -EFAULT;
3817 else
3818 name[MAX_FONT_NAME - 1] = 0;
3819
3820 acquire_console_sem();
3821 if (vc->vc_sw->con_font_default)
3822 rc = vc->vc_sw->con_font_default(vc, &font, s);
3823 else
3824 rc = -ENOSYS;
3825 release_console_sem();
3826 if (!rc) {
3827 op->width = font.width;
3828 op->height = font.height;
3829 }
3830 return rc;
3831}
3832
3833static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3834{
3835 int con = op->height;
3836 int rc;
3837
3838 if (vc->vc_mode != KD_TEXT)
3839 return -EINVAL;
3840
3841 acquire_console_sem();
3842 if (!vc->vc_sw->con_font_copy)
3843 rc = -ENOSYS;
3844 else if (con < 0 || !vc_cons_allocated(con))
3845 rc = -ENOTTY;
3846 else if (con == vc->vc_num) /* nothing to do */
3847 rc = 0;
3848 else
3849 rc = vc->vc_sw->con_font_copy(vc, con);
3850 release_console_sem();
3851 return rc;
3852}
3853
3854int con_font_op(struct vc_data *vc, struct console_font_op *op)
3855{
3856 switch (op->op) {
3857 case KD_FONT_OP_SET:
3858 return con_font_set(vc, op);
3859 case KD_FONT_OP_GET:
3860 return con_font_get(vc, op);
3861 case KD_FONT_OP_SET_DEFAULT:
3862 return con_font_default(vc, op);
3863 case KD_FONT_OP_COPY:
3864 return con_font_copy(vc, op);
3865 }
3866 return -ENOSYS;
3867}
3868
3869/*
3870 * Interface exported to selection and vcs.
3871 */
3872
3873/* used by selection */
3874u16 screen_glyph(struct vc_data *vc, int offset)
3875{
3876 u16 w = scr_readw(screenpos(vc, offset, 1));
3877 u16 c = w & 0xff;
3878
3879 if (w & vc->vc_hi_font_mask)
3880 c |= 0x100;
3881 return c;
3882}
3883
3884/* used by vcs - note the word offset */
3885unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3886{
3887 return screenpos(vc, 2 * w_offset, viewed);
3888}
3889
3890void getconsxy(struct vc_data *vc, unsigned char *p)
3891{
3892 p[0] = vc->vc_x;
3893 p[1] = vc->vc_y;
3894}
3895
3896void putconsxy(struct vc_data *vc, unsigned char *p)
3897{
9477e260 3898 hide_cursor(vc);
1da177e4
LT		 3899 gotoxy(vc, p[0], p[1]);
3900 set_cursor(vc);
3901}
3902
3903u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3904{
3905 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3906 return softcursor_original;
3907 return scr_readw(org);
3908}
3909
3910void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3911{
3912 scr_writew(val, org);
3913 if ((unsigned long)org == vc->vc_pos) {
3914 softcursor_original = -1;
3915 add_softcursor(vc);
3916 }
3917}
3918
3919/*
3920 * Visible symbols for modules
3921 */
3922
3923EXPORT_SYMBOL(color_table);
3924EXPORT_SYMBOL(default_red);
3925EXPORT_SYMBOL(default_grn);
3926EXPORT_SYMBOL(default_blu);
3927EXPORT_SYMBOL(update_region);
3928EXPORT_SYMBOL(redraw_screen);
3929EXPORT_SYMBOL(vc_resize);
ca9bda00 3930EXPORT_SYMBOL(vc_lock_resize);
1da177e4
LT		 3931EXPORT_SYMBOL(fg_console);
3932EXPORT_SYMBOL(console_blank_hook);
3933EXPORT_SYMBOL(console_blanked);
3934EXPORT_SYMBOL(vc_cons);
3935#ifndef VT_SINGLE_DRIVER
3936EXPORT_SYMBOL(take_over_console);
3937EXPORT_SYMBOL(give_up_console);
3938#endif
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