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[PATCH] VT binding: Add new doc file describing the feature
[thirdparty/linux.git] / drivers / char / vt.c
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1da177e4
LT		 1/*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <g-hunt@ee.utah.edu>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
23 *
24 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <poe@daimi.aau.dk>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <geert@linux-m68k.org>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <arno@usn.nl>
41 * - David Carter <carter@cs.bris.ac.uk>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <core@ggi-project.org>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
62 * deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
66 */
67
68#include <linux/module.h>
69#include <linux/types.h>
70#include <linux/sched.h>
71#include <linux/tty.h>
72#include <linux/tty_flip.h>
73#include <linux/kernel.h>
74#include <linux/string.h>
75#include <linux/errno.h>
76#include <linux/kd.h>
77#include <linux/slab.h>
78#include <linux/major.h>
79#include <linux/mm.h>
80#include <linux/console.h>
81#include <linux/init.h>
82#include <linux/devfs_fs_kernel.h>
83#include <linux/vt_kern.h>
84#include <linux/selection.h>
85#include <linux/tiocl.h>
86#include <linux/kbd_kern.h>
87#include <linux/consolemap.h>
88#include <linux/timer.h>
89#include <linux/interrupt.h>
90#include <linux/config.h>
91#include <linux/workqueue.h>
92#include <linux/bootmem.h>
93#include <linux/pm.h>
94#include <linux/font.h>
95#include <linux/bitops.h>
96
97#include <asm/io.h>
98#include <asm/system.h>
99#include <asm/uaccess.h>
100
3e795de7 101#define MAX_NR_CON_DRIVER 16
1da177e4 102
3e795de7
AD		 103#define CON_DRIVER_FLAG_BIND 1
104#define CON_DRIVER_FLAG_INIT 2
105
106struct con_driver {
107 const struct consw *con;
108 const char *desc;
109 int first;
110 int last;
111 int flag;
112};
113
114static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 115const struct consw *conswitchp;
116
117/* A bitmap for codes <32. A bit of 1 indicates that the code
118 * corresponding to that bit number invokes some special action
119 * (such as cursor movement) and should not be displayed as a
120 * glyph unless the disp_ctrl mode is explicitly enabled.
121 */
122#define CTRL_ACTION 0x0d00ff81
123#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
124
125/*
126 * Here is the default bell parameters: 750HZ, 1/8th of a second
127 */
128#define DEFAULT_BELL_PITCH 750
129#define DEFAULT_BELL_DURATION (HZ/8)
130
131extern void vcs_make_devfs(struct tty_struct *tty);
132extern void vcs_remove_devfs(struct tty_struct *tty);
133
134extern void console_map_init(void);
135#ifdef CONFIG_PROM_CONSOLE
136extern void prom_con_init(void);
137#endif
138#ifdef CONFIG_MDA_CONSOLE
139extern int mda_console_init(void);
140#endif
141
142struct vc vc_cons [MAX_NR_CONSOLES];
143
144#ifndef VT_SINGLE_DRIVER
145static const struct consw *con_driver_map[MAX_NR_CONSOLES];
146#endif
147
148static int con_open(struct tty_struct *, struct file *);
149static void vc_init(struct vc_data *vc, unsigned int rows,
150 unsigned int cols, int do_clear);
151static void gotoxy(struct vc_data *vc, int new_x, int new_y);
152static void save_cur(struct vc_data *vc);
153static void reset_terminal(struct vc_data *vc, int do_clear);
154static void con_flush_chars(struct tty_struct *tty);
155static void set_vesa_blanking(char __user *p);
156static void set_cursor(struct vc_data *vc);
157static void hide_cursor(struct vc_data *vc);
158static void console_callback(void *ignored);
159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
162static int printable; /* Is console ready for printing? */
163
164/*
165 * ignore_poke: don't unblank the screen when things are typed. This is
166 * mainly for the privacy of braille terminal users.
167 */
168static int ignore_poke;
169
170int do_poke_blanked_console;
171int console_blanked;
172
173static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
174static int blankinterval = 10*60*HZ;
175static int vesa_off_interval;
176
177static DECLARE_WORK(console_work, console_callback, NULL);
178
179/*
180 * fg_console is the current virtual console,
181 * last_console is the last used one,
182 * want_console is the console we want to switch to,
183 * kmsg_redirect is the console for kernel messages,
184 */
185int fg_console;
186int last_console;
187int want_console = -1;
188int kmsg_redirect;
189
190/*
191 * For each existing display, we have a pointer to console currently visible
192 * on that display, allowing consoles other than fg_console to be refreshed
193 * appropriately. Unless the low-level driver supplies its own display_fg
194 * variable, we use this one for the "master display".
195 */
196static struct vc_data *master_display_fg;
197
198/*
199 * Unfortunately, we need to delay tty echo when we're currently writing to the
200 * console since the code is (and always was) not re-entrant, so we schedule
201 * all flip requests to process context with schedule-task() and run it from
202 * console_callback().
203 */
204
205/*
206 * For the same reason, we defer scrollback to the console callback.
207 */
208static int scrollback_delta;
209
210/*
211 * Hook so that the power management routines can (un)blank
212 * the console on our behalf.
213 */
214int (*console_blank_hook)(int);
215
216static struct timer_list console_timer;
217static int blank_state;
218static int blank_timer_expired;
219enum {
220 blank_off = 0,
221 blank_normal_wait,
222 blank_vesa_wait,
223};
224
225/*
226 * Low-Level Functions
227 */
228
229#define IS_FG(vc) ((vc)->vc_num == fg_console)
230
231#ifdef VT_BUF_VRAM_ONLY
232#define DO_UPDATE(vc) 0
233#else
234#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
235#endif
236
237static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
238{
239 unsigned short *p;
240
241 if (!viewed)
242 p = (unsigned short *)(vc->vc_origin + offset);
243 else if (!vc->vc_sw->con_screen_pos)
244 p = (unsigned short *)(vc->vc_visible_origin + offset);
245 else
246 p = vc->vc_sw->con_screen_pos(vc, offset);
247 return p;
248}
249
250static inline void scrolldelta(int lines)
251{
252 scrollback_delta += lines;
253 schedule_console_callback();
254}
255
256void schedule_console_callback(void)
257{
258 schedule_work(&console_work);
259}
260
261static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
262{
263 unsigned short *d, *s;
264
265 if (t+nr >= b)
266 nr = b - t - 1;
267 if (b > vc->vc_rows || t >= b || nr < 1)
268 return;
269 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
270 return;
271 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
272 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
273 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
274 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
275 vc->vc_size_row * nr);
276}
277
278static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
279{
280 unsigned short *s;
281 unsigned int step;
282
283 if (t+nr >= b)
284 nr = b - t - 1;
285 if (b > vc->vc_rows || t >= b || nr < 1)
286 return;
287 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
288 return;
289 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
290 step = vc->vc_cols * nr;
291 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
292 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
293}
294
295static void do_update_region(struct vc_data *vc, unsigned long start, int count)
296{
297#ifndef VT_BUF_VRAM_ONLY
298 unsigned int xx, yy, offset;
299 u16 *p;
300
301 p = (u16 *) start;
302 if (!vc->vc_sw->con_getxy) {
303 offset = (start - vc->vc_origin) / 2;
304 xx = offset % vc->vc_cols;
305 yy = offset / vc->vc_cols;
306 } else {
307 int nxx, nyy;
308 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
309 xx = nxx; yy = nyy;
310 }
311 for(;;) {
312 u16 attrib = scr_readw(p) & 0xff00;
313 int startx = xx;
314 u16 *q = p;
315 while (xx < vc->vc_cols && count) {
316 if (attrib != (scr_readw(p) & 0xff00)) {
317 if (p > q)
318 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
319 startx = xx;
320 q = p;
321 attrib = scr_readw(p) & 0xff00;
322 }
323 p++;
324 xx++;
325 count--;
326 }
327 if (p > q)
328 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
329 if (!count)
330 break;
331 xx = 0;
332 yy++;
333 if (vc->vc_sw->con_getxy) {
334 p = (u16 *)start;
335 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
336 }
337 }
338#endif
339}
340
341void update_region(struct vc_data *vc, unsigned long start, int count)
342{
343 WARN_CONSOLE_UNLOCKED();
344
345 if (DO_UPDATE(vc)) {
346 hide_cursor(vc);
347 do_update_region(vc, start, count);
348 set_cursor(vc);
349 }
350}
351
352/* Structure of attributes is hardware-dependent */
353
354static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
355{
356 if (vc->vc_sw->con_build_attr)
357 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
358
359#ifndef VT_BUF_VRAM_ONLY
360/*
361 * ++roman: I completely changed the attribute format for monochrome
362 * mode (!can_do_color). The formerly used MDA (monochrome display
363 * adapter) format didn't allow the combination of certain effects.
364 * Now the attribute is just a bit vector:
365 * Bit 0..1: intensity (0..2)
366 * Bit 2 : underline
367 * Bit 3 : reverse
368 * Bit 7 : blink
369 */
370 {
371 u8 a = vc->vc_color;
372 if (!vc->vc_can_do_color)
373 return _intensity |
374 (_underline ? 4 : 0) |
375 (_reverse ? 8 : 0) |
376 (_blink ? 0x80 : 0);
377 if (_underline)
378 a = (a & 0xf0) | vc->vc_ulcolor;
379 else if (_intensity == 0)
380 a = (a & 0xf0) | vc->vc_ulcolor;
381 if (_reverse)
382 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
383 if (_blink)
384 a ^= 0x80;
385 if (_intensity == 2)
386 a ^= 0x08;
387 if (vc->vc_hi_font_mask == 0x100)
388 a <<= 1;
389 return a;
390 }
391#else
392 return 0;
393#endif
394}
395
396static void update_attr(struct vc_data *vc)
397{
398 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
399 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
400}
401
402/* Note: inverting the screen twice should revert to the original state */
403void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
404{
405 unsigned short *p;
406
407 WARN_CONSOLE_UNLOCKED();
408
409 count /= 2;
410 p = screenpos(vc, offset, viewed);
411 if (vc->vc_sw->con_invert_region)
412 vc->vc_sw->con_invert_region(vc, p, count);
413#ifndef VT_BUF_VRAM_ONLY
414 else {
415 u16 *q = p;
416 int cnt = count;
417 u16 a;
418
419 if (!vc->vc_can_do_color) {
420 while (cnt--) {
421 a = scr_readw(q);
422 a ^= 0x0800;
423 scr_writew(a, q);
424 q++;
425 }
426 } else if (vc->vc_hi_font_mask == 0x100) {
427 while (cnt--) {
428 a = scr_readw(q);
429 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
430 scr_writew(a, q);
431 q++;
432 }
433 } else {
434 while (cnt--) {
435 a = scr_readw(q);
436 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
437 scr_writew(a, q);
438 q++;
439 }
440 }
441 }
442#endif
443 if (DO_UPDATE(vc))
444 do_update_region(vc, (unsigned long) p, count);
445}
446
447/* used by selection: complement pointer position */
448void complement_pos(struct vc_data *vc, int offset)
449{
414edcd3 450 static int old_offset = -1;
1da177e4
LT		 451 static unsigned short old;
452 static unsigned short oldx, oldy;
453
454 WARN_CONSOLE_UNLOCKED();
455
414edcd3
AD		 456 if (old_offset != -1 && old_offset >= 0 &&
457 old_offset < vc->vc_screenbuf_size) {
458 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 459 if (DO_UPDATE(vc))
460 vc->vc_sw->con_putc(vc, old, oldy, oldx);
461 }
414edcd3
AD		 462
463 old_offset = offset;
464
465 if (offset != -1 && offset >= 0 &&
466 offset < vc->vc_screenbuf_size) {
1da177e4 467 unsigned short new;
414edcd3 468 unsigned short *p;
1da177e4
LT		 469 p = screenpos(vc, offset, 1);
470 old = scr_readw(p);
471 new = old ^ vc->vc_complement_mask;
472 scr_writew(new, p);
473 if (DO_UPDATE(vc)) {
474 oldx = (offset >> 1) % vc->vc_cols;
475 oldy = (offset >> 1) / vc->vc_cols;
476 vc->vc_sw->con_putc(vc, new, oldy, oldx);
477 }
478 }
414edcd3 479
1da177e4
LT		 480}
481
482static void insert_char(struct vc_data *vc, unsigned int nr)
483{
484 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
485
486 p = q + vc->vc_cols - nr - vc->vc_x;
487 while (--p >= q)
488 scr_writew(scr_readw(p), p + nr);
489 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
490 vc->vc_need_wrap = 0;
491 if (DO_UPDATE(vc)) {
492 unsigned short oldattr = vc->vc_attr;
493 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
494 vc->vc_cols - vc->vc_x - nr);
495 vc->vc_attr = vc->vc_video_erase_char >> 8;
496 while (nr--)
497 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
498 vc->vc_attr = oldattr;
499 }
500}
501
502static void delete_char(struct vc_data *vc, unsigned int nr)
503{
504 unsigned int i = vc->vc_x;
505 unsigned short *p = (unsigned short *)vc->vc_pos;
506
507 while (++i <= vc->vc_cols - nr) {
508 scr_writew(scr_readw(p+nr), p);
509 p++;
510 }
511 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
512 vc->vc_need_wrap = 0;
513 if (DO_UPDATE(vc)) {
514 unsigned short oldattr = vc->vc_attr;
515 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
516 vc->vc_cols - vc->vc_x - nr);
517 vc->vc_attr = vc->vc_video_erase_char >> 8;
518 while (nr--)
519 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
520 vc->vc_cols - 1 - nr);
521 vc->vc_attr = oldattr;
522 }
523}
524
525static int softcursor_original;
526
527static void add_softcursor(struct vc_data *vc)
528{
529 int i = scr_readw((u16 *) vc->vc_pos);
530 u32 type = vc->vc_cursor_type;
531
532 if (! (type & 0x10)) return;
533 if (softcursor_original != -1) return;
534 softcursor_original = i;
535 i |= ((type >> 8) & 0xff00 );
536 i ^= ((type) & 0xff00 );
537 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
538 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
539 scr_writew(i, (u16 *) vc->vc_pos);
540 if (DO_UPDATE(vc))
541 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
542}
543
544static void hide_softcursor(struct vc_data *vc)
545{
546 if (softcursor_original != -1) {
547 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
548 if (DO_UPDATE(vc))
549 vc->vc_sw->con_putc(vc, softcursor_original,
550 vc->vc_y, vc->vc_x);
551 softcursor_original = -1;
552 }
553}
554
555static void hide_cursor(struct vc_data *vc)
556{
557 if (vc == sel_cons)
558 clear_selection();
559 vc->vc_sw->con_cursor(vc, CM_ERASE);
560 hide_softcursor(vc);
561}
562
563static void set_cursor(struct vc_data *vc)
564{
565 if (!IS_FG(vc) || console_blanked ||
566 vc->vc_mode == KD_GRAPHICS)
567 return;
568 if (vc->vc_deccm) {
569 if (vc == sel_cons)
570 clear_selection();
571 add_softcursor(vc);
572 if ((vc->vc_cursor_type & 0x0f) != 1)
573 vc->vc_sw->con_cursor(vc, CM_DRAW);
574 } else
575 hide_cursor(vc);
576}
577
578static void set_origin(struct vc_data *vc)
579{
580 WARN_CONSOLE_UNLOCKED();
581
582 if (!CON_IS_VISIBLE(vc) ||
583 !vc->vc_sw->con_set_origin ||
584 !vc->vc_sw->con_set_origin(vc))
585 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
586 vc->vc_visible_origin = vc->vc_origin;
587 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
588 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
589}
590
591static inline void save_screen(struct vc_data *vc)
592{
593 WARN_CONSOLE_UNLOCKED();
594
595 if (vc->vc_sw->con_save_screen)
596 vc->vc_sw->con_save_screen(vc);
597}
598
599/*
600 * Redrawing of screen
601 */
602
603static void clear_buffer_attributes(struct vc_data *vc)
604{
605 unsigned short *p = (unsigned short *)vc->vc_origin;
606 int count = vc->vc_screenbuf_size / 2;
607 int mask = vc->vc_hi_font_mask | 0xff;
608
609 for (; count > 0; count--, p++) {
610 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
611 }
612}
613
614void redraw_screen(struct vc_data *vc, int is_switch)
615{
616 int redraw = 0;
617
618 WARN_CONSOLE_UNLOCKED();
619
620 if (!vc) {
621 /* strange ... */
622 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
623 return;
624 }
625
626 if (is_switch) {
627 struct vc_data *old_vc = vc_cons[fg_console].d;
628 if (old_vc == vc)
629 return;
630 if (!CON_IS_VISIBLE(vc))
631 redraw = 1;
632 *vc->vc_display_fg = vc;
633 fg_console = vc->vc_num;
634 hide_cursor(old_vc);
635 if (!CON_IS_VISIBLE(old_vc)) {
636 save_screen(old_vc);
637 set_origin(old_vc);
638 }
639 } else {
640 hide_cursor(vc);
641 redraw = 1;
642 }
643
644 if (redraw) {
645 int update;
646 int old_was_color = vc->vc_can_do_color;
647
648 set_origin(vc);
649 update = vc->vc_sw->con_switch(vc);
650 set_palette(vc);
651 /*
652 * If console changed from mono<->color, the best we can do
653 * is to clear the buffer attributes. As it currently stands,
654 * rebuilding new attributes from the old buffer is not doable
655 * without overly complex code.
656 */
657 if (old_was_color != vc->vc_can_do_color) {
658 update_attr(vc);
659 clear_buffer_attributes(vc);
660 }
661 if (update && vc->vc_mode != KD_GRAPHICS)
662 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
663 }
664 set_cursor(vc);
665 if (is_switch) {
666 set_leds();
667 compute_shiftstate();
668 }
669}
670
671/*
672 * Allocation, freeing and resizing of VTs.
673 */
674
675int vc_cons_allocated(unsigned int i)
676{
677 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
678}
679
680static void visual_init(struct vc_data *vc, int num, int init)
681{
682 /* ++Geert: vc->vc_sw->con_init determines console size */
683 if (vc->vc_sw)
684 module_put(vc->vc_sw->owner);
685 vc->vc_sw = conswitchp;
686#ifndef VT_SINGLE_DRIVER
687 if (con_driver_map[num])
688 vc->vc_sw = con_driver_map[num];
689#endif
690 __module_get(vc->vc_sw->owner);
691 vc->vc_num = num;
692 vc->vc_display_fg = &master_display_fg;
693 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
694 vc->vc_uni_pagedir = 0;
695 vc->vc_hi_font_mask = 0;
696 vc->vc_complement_mask = 0;
697 vc->vc_can_do_color = 0;
698 vc->vc_sw->con_init(vc, init);
699 if (!vc->vc_complement_mask)
700 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
701 vc->vc_s_complement_mask = vc->vc_complement_mask;
702 vc->vc_size_row = vc->vc_cols << 1;
703 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
704}
705
706int vc_allocate(unsigned int currcons) /* return 0 on success */
707{
708 WARN_CONSOLE_UNLOCKED();
709
710 if (currcons >= MAX_NR_CONSOLES)
711 return -ENXIO;
712 if (!vc_cons[currcons].d) {
713 struct vc_data *vc;
714
715 /* prevent users from taking too much memory */
716 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
717 return -EPERM;
718
719 /* due to the granularity of kmalloc, we waste some memory here */
720 /* the alloc is done in two steps, to optimize the common situation
721 of a 25x80 console (structsize=216, screenbuf_size=4000) */
722 /* although the numbers above are not valid since long ago, the
723 point is still up-to-date and the comment still has its value
724 even if only as a historical artifact. --mj, July 1998 */
725 vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
726 if (!vc)
727 return -ENOMEM;
728 memset(vc, 0, sizeof(*vc));
729 vc_cons[currcons].d = vc;
730 visual_init(vc, currcons, 1);
731 if (!*vc->vc_uni_pagedir_loc)
732 con_set_default_unimap(vc);
733 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
734 if (!vc->vc_screenbuf) {
735 kfree(vc);
736 vc_cons[currcons].d = NULL;
737 return -ENOMEM;
738 }
739 vc->vc_kmalloced = 1;
740 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
741 }
742 return 0;
743}
744
745static inline int resize_screen(struct vc_data *vc, int width, int height)
746{
747 /* Resizes the resolution of the display adapater */
748 int err = 0;
749
750 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
751 err = vc->vc_sw->con_resize(vc, width, height);
752 return err;
753}
754
755/*
756 * Change # of rows and columns (0 means unchanged/the size of fg_console)
757 * [this is to be used together with some user program
758 * like resize that changes the hardware videomode]
759 */
760#define VC_RESIZE_MAXCOL (32767)
761#define VC_RESIZE_MAXROW (32767)
762int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
763{
764 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
765 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
766 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
3b41dc1a 767 unsigned int end;
1da177e4
LT		 768 unsigned short *newscreen;
769
770 WARN_CONSOLE_UNLOCKED();
771
772 if (!vc)
773 return -ENXIO;
774
775 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
776 return -EINVAL;
777
778 new_cols = (cols ? cols : vc->vc_cols);
779 new_rows = (lines ? lines : vc->vc_rows);
780 new_row_size = new_cols << 1;
781 new_screen_size = new_row_size * new_rows;
782
783 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
784 return 0;
785
786 newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
787 if (!newscreen)
788 return -ENOMEM;
789
790 old_rows = vc->vc_rows;
791 old_cols = vc->vc_cols;
792 old_row_size = vc->vc_size_row;
793 old_screen_size = vc->vc_screenbuf_size;
794
795 err = resize_screen(vc, new_cols, new_rows);
796 if (err) {
797 kfree(newscreen);
798 return err;
799 }
800
801 vc->vc_rows = new_rows;
802 vc->vc_cols = new_cols;
803 vc->vc_size_row = new_row_size;
804 vc->vc_screenbuf_size = new_screen_size;
805
806 rlth = min(old_row_size, new_row_size);
807 rrem = new_row_size - rlth;
808 old_origin = vc->vc_origin;
809 new_origin = (long) newscreen;
810 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 811
812 if (vc->vc_y > new_rows) {
813 if (old_rows - vc->vc_y < new_rows) {
814 /*
815 * Cursor near the bottom, copy contents from the
816 * bottom of buffer
817 */
818 old_origin += (old_rows - new_rows) * old_row_size;
819 end = vc->vc_scr_end;
820 } else {
821 /*
822 * Cursor is in no man's land, copy 1/2 screenful
823 * from the top and bottom of cursor position
824 */
825 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
065d9cac 826 end = old_origin + (old_row_size * new_rows);
3b41dc1a
AD		 827 }
828 } else
829 /*
830 * Cursor near the top, copy contents from the top of buffer
831 */
065d9cac
AD		 832 end = (old_rows > new_rows) ? old_origin +
833 (old_row_size * new_rows) :
3b41dc1a 834 vc->vc_scr_end;
1da177e4
LT		 835
836 update_attr(vc);
837
3b41dc1a
AD		 838 while (old_origin < end) {
839 scr_memcpyw((unsigned short *) new_origin,
840 (unsigned short *) old_origin, rlth);
1da177e4 841 if (rrem)
3b41dc1a
AD		 842 scr_memsetw((void *)(new_origin + rlth),
843 vc->vc_video_erase_char, rrem);
1da177e4
LT		 844 old_origin += old_row_size;
845 new_origin += new_row_size;
846 }
847 if (new_scr_end > new_origin)
3b41dc1a
AD		 848 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
849 new_scr_end - new_origin);
1da177e4
LT		 850 if (vc->vc_kmalloced)
851 kfree(vc->vc_screenbuf);
852 vc->vc_screenbuf = newscreen;
853 vc->vc_kmalloced = 1;
854 vc->vc_screenbuf_size = new_screen_size;
855 set_origin(vc);
856
857 /* do part of a reset_terminal() */
858 vc->vc_top = 0;
859 vc->vc_bottom = vc->vc_rows;
860 gotoxy(vc, vc->vc_x, vc->vc_y);
861 save_cur(vc);
862
863 if (vc->vc_tty) {
864 struct winsize ws, *cws = &vc->vc_tty->winsize;
865
866 memset(&ws, 0, sizeof(ws));
867 ws.ws_row = vc->vc_rows;
868 ws.ws_col = vc->vc_cols;
869 ws.ws_ypixel = vc->vc_scan_lines;
870 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
871 vc->vc_tty->pgrp > 0)
872 kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
873 *cws = ws;
874 }
875
876 if (CON_IS_VISIBLE(vc))
877 update_screen(vc);
878 return err;
879}
880
881
882void vc_disallocate(unsigned int currcons)
883{
884 WARN_CONSOLE_UNLOCKED();
885
886 if (vc_cons_allocated(currcons)) {
887 struct vc_data *vc = vc_cons[currcons].d;
888 vc->vc_sw->con_deinit(vc);
889 if (vc->vc_kmalloced)
890 kfree(vc->vc_screenbuf);
891 if (currcons >= MIN_NR_CONSOLES)
892 kfree(vc);
893 vc_cons[currcons].d = NULL;
894 }
895}
896
897/*
898 * VT102 emulator
899 */
900
901#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
902#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
903#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
904
905#define decarm VC_REPEAT
906#define decckm VC_CKMODE
907#define kbdapplic VC_APPLIC
908#define lnm VC_CRLF
909
910/*
911 * this is what the terminal answers to a ESC-Z or csi0c query.
912 */
913#define VT100ID "\033[?1;2c"
914#define VT102ID "\033[?6c"
915
916unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
917 8,12,10,14, 9,13,11,15 };
918
919/* the default colour table, for VGA+ colour systems */
920int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
921 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
922int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
923 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
924int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
925 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
926
927/*
928 * gotoxy() must verify all boundaries, because the arguments
929 * might also be negative. If the given position is out of
930 * bounds, the cursor is placed at the nearest margin.
931 */
932static void gotoxy(struct vc_data *vc, int new_x, int new_y)
933{
934 int min_y, max_y;
935
936 if (new_x < 0)
937 vc->vc_x = 0;
938 else {
939 if (new_x >= vc->vc_cols)
940 vc->vc_x = vc->vc_cols - 1;
941 else
942 vc->vc_x = new_x;
943 }
944
945 if (vc->vc_decom) {
946 min_y = vc->vc_top;
947 max_y = vc->vc_bottom;
948 } else {
949 min_y = 0;
950 max_y = vc->vc_rows;
951 }
952 if (new_y < min_y)
953 vc->vc_y = min_y;
954 else if (new_y >= max_y)
955 vc->vc_y = max_y - 1;
956 else
957 vc->vc_y = new_y;
958 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
959 vc->vc_need_wrap = 0;
960}
961
962/* for absolute user moves, when decom is set */
963static void gotoxay(struct vc_data *vc, int new_x, int new_y)
964{
965 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
966}
967
968void scrollback(struct vc_data *vc, int lines)
969{
970 if (!lines)
971 lines = vc->vc_rows / 2;
972 scrolldelta(-lines);
973}
974
975void scrollfront(struct vc_data *vc, int lines)
976{
977 if (!lines)
978 lines = vc->vc_rows / 2;
979 scrolldelta(lines);
980}
981
982static void lf(struct vc_data *vc)
983{
984 /* don't scroll if above bottom of scrolling region, or
985 * if below scrolling region
986 */
987 if (vc->vc_y + 1 == vc->vc_bottom)
988 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
989 else if (vc->vc_y < vc->vc_rows - 1) {
990 vc->vc_y++;
991 vc->vc_pos += vc->vc_size_row;
992 }
993 vc->vc_need_wrap = 0;
994}
995
996static void ri(struct vc_data *vc)
997{
998 /* don't scroll if below top of scrolling region, or
999 * if above scrolling region
1000 */
1001 if (vc->vc_y == vc->vc_top)
1002 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1003 else if (vc->vc_y > 0) {
1004 vc->vc_y--;
1005 vc->vc_pos -= vc->vc_size_row;
1006 }
1007 vc->vc_need_wrap = 0;
1008}
1009
1010static inline void cr(struct vc_data *vc)
1011{
1012 vc->vc_pos -= vc->vc_x << 1;
1013 vc->vc_need_wrap = vc->vc_x = 0;
1014}
1015
1016static inline void bs(struct vc_data *vc)
1017{
1018 if (vc->vc_x) {
1019 vc->vc_pos -= 2;
1020 vc->vc_x--;
1021 vc->vc_need_wrap = 0;
1022 }
1023}
1024
1025static inline void del(struct vc_data *vc)
1026{
1027 /* ignored */
1028}
1029
1030static void csi_J(struct vc_data *vc, int vpar)
1031{
1032 unsigned int count;
1033 unsigned short * start;
1034
1035 switch (vpar) {
1036 case 0: /* erase from cursor to end of display */
1037 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1038 start = (unsigned short *)vc->vc_pos;
1039 if (DO_UPDATE(vc)) {
1040 /* do in two stages */
1041 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1042 vc->vc_cols - vc->vc_x);
1043 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1044 vc->vc_rows - vc->vc_y - 1,
1045 vc->vc_cols);
1046 }
1047 break;
1048 case 1: /* erase from start to cursor */
1049 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1050 start = (unsigned short *)vc->vc_origin;
1051 if (DO_UPDATE(vc)) {
1052 /* do in two stages */
1053 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1054 vc->vc_cols);
1055 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1056 vc->vc_x + 1);
1057 }
1058 break;
1059 case 2: /* erase whole display */
1060 count = vc->vc_cols * vc->vc_rows;
1061 start = (unsigned short *)vc->vc_origin;
1062 if (DO_UPDATE(vc))
1063 vc->vc_sw->con_clear(vc, 0, 0,
1064 vc->vc_rows,
1065 vc->vc_cols);
1066 break;
1067 default:
1068 return;
1069 }
1070 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1071 vc->vc_need_wrap = 0;
1072}
1073
1074static void csi_K(struct vc_data *vc, int vpar)
1075{
1076 unsigned int count;
1077 unsigned short * start;
1078
1079 switch (vpar) {
1080 case 0: /* erase from cursor to end of line */
1081 count = vc->vc_cols - vc->vc_x;
1082 start = (unsigned short *)vc->vc_pos;
1083 if (DO_UPDATE(vc))
1084 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1085 vc->vc_cols - vc->vc_x);
1086 break;
1087 case 1: /* erase from start of line to cursor */
1088 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1089 count = vc->vc_x + 1;
1090 if (DO_UPDATE(vc))
1091 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1092 vc->vc_x + 1);
1093 break;
1094 case 2: /* erase whole line */
1095 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1096 count = vc->vc_cols;
1097 if (DO_UPDATE(vc))
1098 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1099 vc->vc_cols);
1100 break;
1101 default:
1102 return;
1103 }
1104 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1105 vc->vc_need_wrap = 0;
1106}
1107
1108static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1109{ /* not vt100? */
1110 int count;
1111
1112 if (!vpar)
1113 vpar++;
1114 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1115
1116 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1117 if (DO_UPDATE(vc))
1118 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1119 vc->vc_need_wrap = 0;
1120}
1121
1122static void default_attr(struct vc_data *vc)
1123{
1124 vc->vc_intensity = 1;
1125 vc->vc_underline = 0;
1126 vc->vc_reverse = 0;
1127 vc->vc_blink = 0;
1128 vc->vc_color = vc->vc_def_color;
1129}
1130
1131/* console_sem is held */
1132static void csi_m(struct vc_data *vc)
1133{
1134 int i;
1135
1136 for (i = 0; i <= vc->vc_npar; i++)
1137 switch (vc->vc_par[i]) {
1138 case 0: /* all attributes off */
1139 default_attr(vc);
1140 break;
1141 case 1:
1142 vc->vc_intensity = 2;
1143 break;
1144 case 2:
1145 vc->vc_intensity = 0;
1146 break;
1147 case 4:
1148 vc->vc_underline = 1;
1149 break;
1150 case 5:
1151 vc->vc_blink = 1;
1152 break;
1153 case 7:
1154 vc->vc_reverse = 1;
1155 break;
1156 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1157 * Select primary font, don't display
1158 * control chars if defined, don't set
1159 * bit 8 on output.
1160 */
1161 vc->vc_translate = set_translate(vc->vc_charset == 0
1162 ? vc->vc_G0_charset
1163 : vc->vc_G1_charset, vc);
1164 vc->vc_disp_ctrl = 0;
1165 vc->vc_toggle_meta = 0;
1166 break;
1167 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1168 * Select first alternate font, lets
1169 * chars < 32 be displayed as ROM chars.
1170 */
1171 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1172 vc->vc_disp_ctrl = 1;
1173 vc->vc_toggle_meta = 0;
1174 break;
1175 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1176 * Select second alternate font, toggle
1177 * high bit before displaying as ROM char.
1178 */
1179 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1180 vc->vc_disp_ctrl = 1;
1181 vc->vc_toggle_meta = 1;
1182 break;
1183 case 21:
1184 case 22:
1185 vc->vc_intensity = 1;
1186 break;
1187 case 24:
1188 vc->vc_underline = 0;
1189 break;
1190 case 25:
1191 vc->vc_blink = 0;
1192 break;
1193 case 27:
1194 vc->vc_reverse = 0;
1195 break;
1196 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1197 * Enables underscore, white foreground
1198 * with white underscore (Linux - use
1199 * default foreground).
1200 */
1201 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1202 vc->vc_underline = 1;
1203 break;
1204 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1205 * Disable underline option.
1206 * Reset colour to default? It did this
1207 * before...
1208 */
1209 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1210 vc->vc_underline = 0;
1211 break;
1212 case 49:
1213 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1214 break;
1215 default:
1216 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1217 vc->vc_color = color_table[vc->vc_par[i] - 30]
1218 | (vc->vc_color & 0xf0);
1219 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1220 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1221 | (vc->vc_color & 0x0f);
1222 break;
1223 }
1224 update_attr(vc);
1225}
1226
1227static void respond_string(const char *p, struct tty_struct *tty)
1228{
1229 while (*p) {
1230 tty_insert_flip_char(tty, *p, 0);
1231 p++;
1232 }
1233 con_schedule_flip(tty);
1234}
1235
1236static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1237{
1238 char buf[40];
1239
1240 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1241 respond_string(buf, tty);
1242}
1243
1244static inline void status_report(struct tty_struct *tty)
1245{
1246 respond_string("\033[0n", tty); /* Terminal ok */
1247}
1248
1249static inline void respond_ID(struct tty_struct * tty)
1250{
1251 respond_string(VT102ID, tty);
1252}
1253
1254void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1255{
1256 char buf[8];
1257
1258 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1259 (char)('!' + mry));
1260 respond_string(buf, tty);
1261}
1262
1263/* invoked via ioctl(TIOCLINUX) and through set_selection */
1264int mouse_reporting(void)
1265{
1266 return vc_cons[fg_console].d->vc_report_mouse;
1267}
1268
1269/* console_sem is held */
1270static void set_mode(struct vc_data *vc, int on_off)
1271{
1272 int i;
1273
1274 for (i = 0; i <= vc->vc_npar; i++)
1275 if (vc->vc_ques) {
1276 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1277 case 1: /* Cursor keys send ^[Ox/^[[x */
1278 if (on_off)
1279 set_kbd(vc, decckm);
1280 else
1281 clr_kbd(vc, decckm);
1282 break;
1283 case 3: /* 80/132 mode switch unimplemented */
1284 vc->vc_deccolm = on_off;
1285#if 0
1286 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1287 /* this alone does not suffice; some user mode
1288 utility has to change the hardware regs */
1289#endif
1290 break;
1291 case 5: /* Inverted screen on/off */
1292 if (vc->vc_decscnm != on_off) {
1293 vc->vc_decscnm = on_off;
1294 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1295 update_attr(vc);
1296 }
1297 break;
1298 case 6: /* Origin relative/absolute */
1299 vc->vc_decom = on_off;
1300 gotoxay(vc, 0, 0);
1301 break;
1302 case 7: /* Autowrap on/off */
1303 vc->vc_decawm = on_off;
1304 break;
1305 case 8: /* Autorepeat on/off */
1306 if (on_off)
1307 set_kbd(vc, decarm);
1308 else
1309 clr_kbd(vc, decarm);
1310 break;
1311 case 9:
1312 vc->vc_report_mouse = on_off ? 1 : 0;
1313 break;
1314 case 25: /* Cursor on/off */
1315 vc->vc_deccm = on_off;
1316 break;
1317 case 1000:
1318 vc->vc_report_mouse = on_off ? 2 : 0;
1319 break;
1320 }
1321 } else {
1322 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1323 case 3: /* Monitor (display ctrls) */
1324 vc->vc_disp_ctrl = on_off;
1325 break;
1326 case 4: /* Insert Mode on/off */
1327 vc->vc_decim = on_off;
1328 break;
1329 case 20: /* Lf, Enter == CrLf/Lf */
1330 if (on_off)
1331 set_kbd(vc, lnm);
1332 else
1333 clr_kbd(vc, lnm);
1334 break;
1335 }
1336 }
1337}
1338
1339/* console_sem is held */
1340static void setterm_command(struct vc_data *vc)
1341{
1342 switch(vc->vc_par[0]) {
1343 case 1: /* set color for underline mode */
1344 if (vc->vc_can_do_color &&
1345 vc->vc_par[1] < 16) {
1346 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1347 if (vc->vc_underline)
1348 update_attr(vc);
1349 }
1350 break;
1351 case 2: /* set color for half intensity mode */
1352 if (vc->vc_can_do_color &&
1353 vc->vc_par[1] < 16) {
1354 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1355 if (vc->vc_intensity == 0)
1356 update_attr(vc);
1357 }
1358 break;
1359 case 8: /* store colors as defaults */
1360 vc->vc_def_color = vc->vc_attr;
1361 if (vc->vc_hi_font_mask == 0x100)
1362 vc->vc_def_color >>= 1;
1363 default_attr(vc);
1364 update_attr(vc);
1365 break;
1366 case 9: /* set blanking interval */
1367 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1368 poke_blanked_console();
1369 break;
1370 case 10: /* set bell frequency in Hz */
1371 if (vc->vc_npar >= 1)
1372 vc->vc_bell_pitch = vc->vc_par[1];
1373 else
1374 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1375 break;
1376 case 11: /* set bell duration in msec */
1377 if (vc->vc_npar >= 1)
1378 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1379 vc->vc_par[1] * HZ / 1000 : 0;
1380 else
1381 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1382 break;
1383 case 12: /* bring specified console to the front */
1384 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1385 set_console(vc->vc_par[1] - 1);
1386 break;
1387 case 13: /* unblank the screen */
1388 poke_blanked_console();
1389 break;
1390 case 14: /* set vesa powerdown interval */
1391 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1392 break;
1393 case 15: /* activate the previous console */
1394 set_console(last_console);
1395 break;
1396 }
1397}
1398
1399/* console_sem is held */
1400static void csi_at(struct vc_data *vc, unsigned int nr)
1401{
1402 if (nr > vc->vc_cols - vc->vc_x)
1403 nr = vc->vc_cols - vc->vc_x;
1404 else if (!nr)
1405 nr = 1;
1406 insert_char(vc, nr);
1407}
1408
1409/* console_sem is held */
1410static void csi_L(struct vc_data *vc, unsigned int nr)
1411{
1412 if (nr > vc->vc_rows - vc->vc_y)
1413 nr = vc->vc_rows - vc->vc_y;
1414 else if (!nr)
1415 nr = 1;
1416 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1417 vc->vc_need_wrap = 0;
1418}
1419
1420/* console_sem is held */
1421static void csi_P(struct vc_data *vc, unsigned int nr)
1422{
1423 if (nr > vc->vc_cols - vc->vc_x)
1424 nr = vc->vc_cols - vc->vc_x;
1425 else if (!nr)
1426 nr = 1;
1427 delete_char(vc, nr);
1428}
1429
1430/* console_sem is held */
1431static void csi_M(struct vc_data *vc, unsigned int nr)
1432{
1433 if (nr > vc->vc_rows - vc->vc_y)
1434 nr = vc->vc_rows - vc->vc_y;
1435 else if (!nr)
1436 nr=1;
1437 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1438 vc->vc_need_wrap = 0;
1439}
1440
1441/* console_sem is held (except via vc_init->reset_terminal */
1442static void save_cur(struct vc_data *vc)
1443{
1444 vc->vc_saved_x = vc->vc_x;
1445 vc->vc_saved_y = vc->vc_y;
1446 vc->vc_s_intensity = vc->vc_intensity;
1447 vc->vc_s_underline = vc->vc_underline;
1448 vc->vc_s_blink = vc->vc_blink;
1449 vc->vc_s_reverse = vc->vc_reverse;
1450 vc->vc_s_charset = vc->vc_charset;
1451 vc->vc_s_color = vc->vc_color;
1452 vc->vc_saved_G0 = vc->vc_G0_charset;
1453 vc->vc_saved_G1 = vc->vc_G1_charset;
1454}
1455
1456/* console_sem is held */
1457static void restore_cur(struct vc_data *vc)
1458{
1459 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1460 vc->vc_intensity = vc->vc_s_intensity;
1461 vc->vc_underline = vc->vc_s_underline;
1462 vc->vc_blink = vc->vc_s_blink;
1463 vc->vc_reverse = vc->vc_s_reverse;
1464 vc->vc_charset = vc->vc_s_charset;
1465 vc->vc_color = vc->vc_s_color;
1466 vc->vc_G0_charset = vc->vc_saved_G0;
1467 vc->vc_G1_charset = vc->vc_saved_G1;
1468 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1469 update_attr(vc);
1470 vc->vc_need_wrap = 0;
1471}
1472
1473enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1474 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1475 ESpalette };
1476
1477/* console_sem is held (except via vc_init()) */
1478static void reset_terminal(struct vc_data *vc, int do_clear)
1479{
1480 vc->vc_top = 0;
1481 vc->vc_bottom = vc->vc_rows;
1482 vc->vc_state = ESnormal;
1483 vc->vc_ques = 0;
1484 vc->vc_translate = set_translate(LAT1_MAP, vc);
1485 vc->vc_G0_charset = LAT1_MAP;
1486 vc->vc_G1_charset = GRAF_MAP;
1487 vc->vc_charset = 0;
1488 vc->vc_need_wrap = 0;
1489 vc->vc_report_mouse = 0;
1490 vc->vc_utf = 0;
1491 vc->vc_utf_count = 0;
1492
1493 vc->vc_disp_ctrl = 0;
1494 vc->vc_toggle_meta = 0;
1495
1496 vc->vc_decscnm = 0;
1497 vc->vc_decom = 0;
1498 vc->vc_decawm = 1;
1499 vc->vc_deccm = 1;
1500 vc->vc_decim = 0;
1501
1502 set_kbd(vc, decarm);
1503 clr_kbd(vc, decckm);
1504 clr_kbd(vc, kbdapplic);
1505 clr_kbd(vc, lnm);
1506 kbd_table[vc->vc_num].lockstate = 0;
1507 kbd_table[vc->vc_num].slockstate = 0;
1508 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1509 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1510 /* do not do set_leds here because this causes an endless tasklet loop
1511 when the keyboard hasn't been initialized yet */
1512
1513 vc->vc_cursor_type = CUR_DEFAULT;
1514 vc->vc_complement_mask = vc->vc_s_complement_mask;
1515
1516 default_attr(vc);
1517 update_attr(vc);
1518
1519 vc->vc_tab_stop[0] = 0x01010100;
1520 vc->vc_tab_stop[1] =
1521 vc->vc_tab_stop[2] =
1522 vc->vc_tab_stop[3] =
1523 vc->vc_tab_stop[4] = 0x01010101;
1524
1525 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1526 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1527
1528 gotoxy(vc, 0, 0);
1529 save_cur(vc);
1530 if (do_clear)
1531 csi_J(vc, 2);
1532}
1533
1534/* console_sem is held */
1535static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1536{
1537 /*
1538 * Control characters can be used in the _middle_
1539 * of an escape sequence.
1540 */
1541 switch (c) {
1542 case 0:
1543 return;
1544 case 7:
1545 if (vc->vc_bell_duration)
1546 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1547 return;
1548 case 8:
1549 bs(vc);
1550 return;
1551 case 9:
1552 vc->vc_pos -= (vc->vc_x << 1);
1553 while (vc->vc_x < vc->vc_cols - 1) {
1554 vc->vc_x++;
1555 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1556 break;
1557 }
1558 vc->vc_pos += (vc->vc_x << 1);
1559 return;
1560 case 10: case 11: case 12:
1561 lf(vc);
1562 if (!is_kbd(vc, lnm))
1563 return;
1564 case 13:
1565 cr(vc);
1566 return;
1567 case 14:
1568 vc->vc_charset = 1;
1569 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1570 vc->vc_disp_ctrl = 1;
1571 return;
1572 case 15:
1573 vc->vc_charset = 0;
1574 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1575 vc->vc_disp_ctrl = 0;
1576 return;
1577 case 24: case 26:
1578 vc->vc_state = ESnormal;
1579 return;
1580 case 27:
1581 vc->vc_state = ESesc;
1582 return;
1583 case 127:
1584 del(vc);
1585 return;
1586 case 128+27:
1587 vc->vc_state = ESsquare;
1588 return;
1589 }
1590 switch(vc->vc_state) {
1591 case ESesc:
1592 vc->vc_state = ESnormal;
1593 switch (c) {
1594 case '[':
1595 vc->vc_state = ESsquare;
1596 return;
1597 case ']':
1598 vc->vc_state = ESnonstd;
1599 return;
1600 case '%':
1601 vc->vc_state = ESpercent;
1602 return;
1603 case 'E':
1604 cr(vc);
1605 lf(vc);
1606 return;
1607 case 'M':
1608 ri(vc);
1609 return;
1610 case 'D':
1611 lf(vc);
1612 return;
1613 case 'H':
1614 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1615 return;
1616 case 'Z':
1617 respond_ID(tty);
1618 return;
1619 case '7':
1620 save_cur(vc);
1621 return;
1622 case '8':
1623 restore_cur(vc);
1624 return;
1625 case '(':
1626 vc->vc_state = ESsetG0;
1627 return;
1628 case ')':
1629 vc->vc_state = ESsetG1;
1630 return;
1631 case '#':
1632 vc->vc_state = EShash;
1633 return;
1634 case 'c':
1635 reset_terminal(vc, 1);
1636 return;
1637 case '>': /* Numeric keypad */
1638 clr_kbd(vc, kbdapplic);
1639 return;
1640 case '=': /* Appl. keypad */
1641 set_kbd(vc, kbdapplic);
1642 return;
1643 }
1644 return;
1645 case ESnonstd:
1646 if (c=='P') { /* palette escape sequence */
1647 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1648 vc->vc_par[vc->vc_npar] = 0;
1649 vc->vc_npar = 0;
1650 vc->vc_state = ESpalette;
1651 return;
1652 } else if (c=='R') { /* reset palette */
1653 reset_palette(vc);
1654 vc->vc_state = ESnormal;
1655 } else
1656 vc->vc_state = ESnormal;
1657 return;
1658 case ESpalette:
1659 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1660 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1661 if (vc->vc_npar == 7) {
1662 int i = vc->vc_par[0] * 3, j = 1;
1663 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1664 vc->vc_palette[i++] += vc->vc_par[j++];
1665 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1666 vc->vc_palette[i++] += vc->vc_par[j++];
1667 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1668 vc->vc_palette[i] += vc->vc_par[j];
1669 set_palette(vc);
1670 vc->vc_state = ESnormal;
1671 }
1672 } else
1673 vc->vc_state = ESnormal;
1674 return;
1675 case ESsquare:
1676 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1677 vc->vc_par[vc->vc_npar] = 0;
1678 vc->vc_npar = 0;
1679 vc->vc_state = ESgetpars;
1680 if (c == '[') { /* Function key */
1681 vc->vc_state=ESfunckey;
1682 return;
1683 }
1684 vc->vc_ques = (c == '?');
1685 if (vc->vc_ques)
1686 return;
1687 case ESgetpars:
1688 if (c == ';' && vc->vc_npar < NPAR - 1) {
1689 vc->vc_npar++;
1690 return;
1691 } else if (c>='0' && c<='9') {
1692 vc->vc_par[vc->vc_npar] *= 10;
1693 vc->vc_par[vc->vc_npar] += c - '0';
1694 return;
1695 } else
1696 vc->vc_state = ESgotpars;
1697 case ESgotpars:
1698 vc->vc_state = ESnormal;
1699 switch(c) {
1700 case 'h':
1701 set_mode(vc, 1);
1702 return;
1703 case 'l':
1704 set_mode(vc, 0);
1705 return;
1706 case 'c':
1707 if (vc->vc_ques) {
1708 if (vc->vc_par[0])
1709 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1710 else
1711 vc->vc_cursor_type = CUR_DEFAULT;
1712 return;
1713 }
1714 break;
1715 case 'm':
1716 if (vc->vc_ques) {
1717 clear_selection();
1718 if (vc->vc_par[0])
1719 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1720 else
1721 vc->vc_complement_mask = vc->vc_s_complement_mask;
1722 return;
1723 }
1724 break;
1725 case 'n':
1726 if (!vc->vc_ques) {
1727 if (vc->vc_par[0] == 5)
1728 status_report(tty);
1729 else if (vc->vc_par[0] == 6)
1730 cursor_report(vc, tty);
1731 }
1732 return;
1733 }
1734 if (vc->vc_ques) {
1735 vc->vc_ques = 0;
1736 return;
1737 }
1738 switch(c) {
1739 case 'G': case '`':
1740 if (vc->vc_par[0])
1741 vc->vc_par[0]--;
1742 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1743 return;
1744 case 'A':
1745 if (!vc->vc_par[0])
1746 vc->vc_par[0]++;
1747 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1748 return;
1749 case 'B': case 'e':
1750 if (!vc->vc_par[0])
1751 vc->vc_par[0]++;
1752 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1753 return;
1754 case 'C': case 'a':
1755 if (!vc->vc_par[0])
1756 vc->vc_par[0]++;
1757 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1758 return;
1759 case 'D':
1760 if (!vc->vc_par[0])
1761 vc->vc_par[0]++;
1762 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1763 return;
1764 case 'E':
1765 if (!vc->vc_par[0])
1766 vc->vc_par[0]++;
1767 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1768 return;
1769 case 'F':
1770 if (!vc->vc_par[0])
1771 vc->vc_par[0]++;
1772 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1773 return;
1774 case 'd':
1775 if (vc->vc_par[0])
1776 vc->vc_par[0]--;
1777 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1778 return;
1779 case 'H': case 'f':
1780 if (vc->vc_par[0])
1781 vc->vc_par[0]--;
1782 if (vc->vc_par[1])
1783 vc->vc_par[1]--;
1784 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1785 return;
1786 case 'J':
1787 csi_J(vc, vc->vc_par[0]);
1788 return;
1789 case 'K':
1790 csi_K(vc, vc->vc_par[0]);
1791 return;
1792 case 'L':
1793 csi_L(vc, vc->vc_par[0]);
1794 return;
1795 case 'M':
1796 csi_M(vc, vc->vc_par[0]);
1797 return;
1798 case 'P':
1799 csi_P(vc, vc->vc_par[0]);
1800 return;
1801 case 'c':
1802 if (!vc->vc_par[0])
1803 respond_ID(tty);
1804 return;
1805 case 'g':
1806 if (!vc->vc_par[0])
1807 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1808 else if (vc->vc_par[0] == 3) {
1809 vc->vc_tab_stop[0] =
1810 vc->vc_tab_stop[1] =
1811 vc->vc_tab_stop[2] =
1812 vc->vc_tab_stop[3] =
1813 vc->vc_tab_stop[4] = 0;
1814 }
1815 return;
1816 case 'm':
1817 csi_m(vc);
1818 return;
1819 case 'q': /* DECLL - but only 3 leds */
1820 /* map 0,1,2,3 to 0,1,2,4 */
1821 if (vc->vc_par[0] < 4)
1822 setledstate(kbd_table + vc->vc_num,
1823 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1824 return;
1825 case 'r':
1826 if (!vc->vc_par[0])
1827 vc->vc_par[0]++;
1828 if (!vc->vc_par[1])
1829 vc->vc_par[1] = vc->vc_rows;
1830 /* Minimum allowed region is 2 lines */
1831 if (vc->vc_par[0] < vc->vc_par[1] &&
1832 vc->vc_par[1] <= vc->vc_rows) {
1833 vc->vc_top = vc->vc_par[0] - 1;
1834 vc->vc_bottom = vc->vc_par[1];
1835 gotoxay(vc, 0, 0);
1836 }
1837 return;
1838 case 's':
1839 save_cur(vc);
1840 return;
1841 case 'u':
1842 restore_cur(vc);
1843 return;
1844 case 'X':
1845 csi_X(vc, vc->vc_par[0]);
1846 return;
1847 case '@':
1848 csi_at(vc, vc->vc_par[0]);
1849 return;
1850 case ']': /* setterm functions */
1851 setterm_command(vc);
1852 return;
1853 }
1854 return;
1855 case ESpercent:
1856 vc->vc_state = ESnormal;
1857 switch (c) {
1858 case '@': /* defined in ISO 2022 */
1859 vc->vc_utf = 0;
1860 return;
1861 case 'G': /* prelim official escape code */
1862 case '8': /* retained for compatibility */
1863 vc->vc_utf = 1;
1864 return;
1865 }
1866 return;
1867 case ESfunckey:
1868 vc->vc_state = ESnormal;
1869 return;
1870 case EShash:
1871 vc->vc_state = ESnormal;
1872 if (c == '8') {
1873 /* DEC screen alignment test. kludge :-) */
1874 vc->vc_video_erase_char =
1875 (vc->vc_video_erase_char & 0xff00) | 'E';
1876 csi_J(vc, 2);
1877 vc->vc_video_erase_char =
1878 (vc->vc_video_erase_char & 0xff00) | ' ';
1879 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1880 }
1881 return;
1882 case ESsetG0:
1883 if (c == '0')
1884 vc->vc_G0_charset = GRAF_MAP;
1885 else if (c == 'B')
1886 vc->vc_G0_charset = LAT1_MAP;
1887 else if (c == 'U')
1888 vc->vc_G0_charset = IBMPC_MAP;
1889 else if (c == 'K')
1890 vc->vc_G0_charset = USER_MAP;
1891 if (vc->vc_charset == 0)
1892 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1893 vc->vc_state = ESnormal;
1894 return;
1895 case ESsetG1:
1896 if (c == '0')
1897 vc->vc_G1_charset = GRAF_MAP;
1898 else if (c == 'B')
1899 vc->vc_G1_charset = LAT1_MAP;
1900 else if (c == 'U')
1901 vc->vc_G1_charset = IBMPC_MAP;
1902 else if (c == 'K')
1903 vc->vc_G1_charset = USER_MAP;
1904 if (vc->vc_charset == 1)
1905 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1906 vc->vc_state = ESnormal;
1907 return;
1908 default:
1909 vc->vc_state = ESnormal;
1910 }
1911}
1912
1913/* This is a temporary buffer used to prepare a tty console write
1914 * so that we can easily avoid touching user space while holding the
1915 * console spinlock. It is allocated in con_init and is shared by
1916 * this code and the vc_screen read/write tty calls.
1917 *
1918 * We have to allocate this statically in the kernel data section
1919 * since console_init (and thus con_init) are called before any
1920 * kernel memory allocation is available.
1921 */
1922char con_buf[CON_BUF_SIZE];
1923DECLARE_MUTEX(con_buf_sem);
1924
1925/* acquires console_sem */
1926static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1927{
1928#ifdef VT_BUF_VRAM_ONLY
1929#define FLUSH do { } while(0);
1930#else
1931#define FLUSH if (draw_x >= 0) { \
1932 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1933 draw_x = -1; \
1934 }
1935#endif
1936
1937 int c, tc, ok, n = 0, draw_x = -1;
1938 unsigned int currcons;
1939 unsigned long draw_from = 0, draw_to = 0;
1940 struct vc_data *vc;
1941 u16 himask, charmask;
1942 const unsigned char *orig_buf = NULL;
1943 int orig_count;
1944
1945 if (in_interrupt())
1946 return count;
1947
1948 might_sleep();
1949
1950 acquire_console_sem();
1951 vc = tty->driver_data;
1952 if (vc == NULL) {
1953 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1954 release_console_sem();
1955 return 0;
1956 }
1957
1958 currcons = vc->vc_num;
1959 if (!vc_cons_allocated(currcons)) {
1960 /* could this happen? */
1961 static int error = 0;
1962 if (!error) {
1963 error = 1;
1964 printk("con_write: tty %d not allocated\n", currcons+1);
1965 }
1966 release_console_sem();
1967 return 0;
1968 }
1969 release_console_sem();
1970
1971 orig_buf = buf;
1972 orig_count = count;
1973
1974 /* At this point 'buf' is guaranteed to be a kernel buffer
1975 * and therefore no access to userspace (and therefore sleeping)
1976 * will be needed. The con_buf_sem serializes all tty based
1977 * console rendering and vcs write/read operations. We hold
1978 * the console spinlock during the entire write.
1979 */
1980
1981 acquire_console_sem();
1982
1983 vc = tty->driver_data;
1984 if (vc == NULL) {
1985 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1986 release_console_sem();
1987 goto out;
1988 }
1989
1990 himask = vc->vc_hi_font_mask;
1991 charmask = himask ? 0x1ff : 0xff;
1992
1993 /* undraw cursor first */
1994 if (IS_FG(vc))
1995 hide_cursor(vc);
1996
1997 while (!tty->stopped && count) {
1998 int orig = *buf;
1999 c = orig;
2000 buf++;
2001 n++;
2002 count--;
2003
2004 /* Do no translation at all in control states */
2005 if (vc->vc_state != ESnormal) {
2006 tc = c;
2007 } else if (vc->vc_utf) {
2008 /* Combine UTF-8 into Unicode */
2009 /* Incomplete characters silently ignored */
2010 if(c > 0x7f) {
2011 if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
2012 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2013 vc->vc_utf_count--;
2014 if (vc->vc_utf_count == 0)
2015 tc = c = vc->vc_utf_char;
2016 else continue;
2017 } else {
2018 if ((c & 0xe0) == 0xc0) {
2019 vc->vc_utf_count = 1;
2020 vc->vc_utf_char = (c & 0x1f);
2021 } else if ((c & 0xf0) == 0xe0) {
2022 vc->vc_utf_count = 2;
2023 vc->vc_utf_char = (c & 0x0f);
2024 } else if ((c & 0xf8) == 0xf0) {
2025 vc->vc_utf_count = 3;
2026 vc->vc_utf_char = (c & 0x07);
2027 } else if ((c & 0xfc) == 0xf8) {
2028 vc->vc_utf_count = 4;
2029 vc->vc_utf_char = (c & 0x03);
2030 } else if ((c & 0xfe) == 0xfc) {
2031 vc->vc_utf_count = 5;
2032 vc->vc_utf_char = (c & 0x01);
2033 } else
2034 vc->vc_utf_count = 0;
2035 continue;
2036 }
2037 } else {
2038 tc = c;
2039 vc->vc_utf_count = 0;
2040 }
2041 } else { /* no utf */
2042 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
2043 }
2044
2045 /* If the original code was a control character we
2046 * only allow a glyph to be displayed if the code is
2047 * not normally used (such as for cursor movement) or
2048 * if the disp_ctrl mode has been explicitly enabled.
2049 * Certain characters (as given by the CTRL_ALWAYS
2050 * bitmap) are always displayed as control characters,
2051 * as the console would be pretty useless without
2052 * them; to display an arbitrary font position use the
2053 * direct-to-font zone in UTF-8 mode.
2054 */
2055 ok = tc && (c >= 32 ||
2056 (!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
2057 : CTRL_ACTION) >> c) & 1)))
2058 && (c != 127 || vc->vc_disp_ctrl)
2059 && (c != 128+27);
2060
2061 if (vc->vc_state == ESnormal && ok) {
2062 /* Now try to find out how to display it */
2063 tc = conv_uni_to_pc(vc, tc);
2064 if ( tc == -4 ) {
2065 /* If we got -4 (not found) then see if we have
2066 defined a replacement character (U+FFFD) */
2067 tc = conv_uni_to_pc(vc, 0xfffd);
2068
2069 /* One reason for the -4 can be that we just
2070 did a clear_unimap();
2071 try at least to show something. */
2072 if (tc == -4)
2073 tc = c;
2074 } else if ( tc == -3 ) {
2075 /* Bad hash table -- hope for the best */
2076 tc = c;
2077 }
2078 if (tc & ~charmask)
2079 continue; /* Conversion failed */
2080
2081 if (vc->vc_need_wrap || vc->vc_decim)
2082 FLUSH
2083 if (vc->vc_need_wrap) {
2084 cr(vc);
2085 lf(vc);
2086 }
2087 if (vc->vc_decim)
2088 insert_char(vc, 1);
2089 scr_writew(himask ?
2090 ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2091 (vc->vc_attr << 8) + tc,
2092 (u16 *) vc->vc_pos);
2093 if (DO_UPDATE(vc) && draw_x < 0) {
2094 draw_x = vc->vc_x;
2095 draw_from = vc->vc_pos;
2096 }
2097 if (vc->vc_x == vc->vc_cols - 1) {
2098 vc->vc_need_wrap = vc->vc_decawm;
2099 draw_to = vc->vc_pos + 2;
2100 } else {
2101 vc->vc_x++;
2102 draw_to = (vc->vc_pos += 2);
2103 }
2104 continue;
2105 }
2106 FLUSH
2107 do_con_trol(tty, vc, orig);
2108 }
2109 FLUSH
2110 console_conditional_schedule();
2111 release_console_sem();
2112
2113out:
2114 return n;
2115#undef FLUSH
2116}
2117
2118/*
2119 * This is the console switching callback.
2120 *
2121 * Doing console switching in a process context allows
2122 * us to do the switches asynchronously (needed when we want
2123 * to switch due to a keyboard interrupt). Synchronization
2124 * with other console code and prevention of re-entrancy is
2125 * ensured with console_sem.
2126 */
2127static void console_callback(void *ignored)
2128{
2129 acquire_console_sem();
2130
2131 if (want_console >= 0) {
2132 if (want_console != fg_console &&
2133 vc_cons_allocated(want_console)) {
2134 hide_cursor(vc_cons[fg_console].d);
2135 change_console(vc_cons[want_console].d);
2136 /* we only changed when the console had already
2137 been allocated - a new console is not created
2138 in an interrupt routine */
2139 }
2140 want_console = -1;
2141 }
2142 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2143 do_poke_blanked_console = 0;
2144 poke_blanked_console();
2145 }
2146 if (scrollback_delta) {
2147 struct vc_data *vc = vc_cons[fg_console].d;
2148 clear_selection();
2149 if (vc->vc_mode == KD_TEXT)
2150 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2151 scrollback_delta = 0;
2152 }
2153 if (blank_timer_expired) {
2154 do_blank_screen(0);
2155 blank_timer_expired = 0;
2156 }
2157
2158 release_console_sem();
2159}
2160
2161void set_console(int nr)
2162{
2163 want_console = nr;
2164 schedule_console_callback();
2165}
2166
2167struct tty_driver *console_driver;
2168
2169#ifdef CONFIG_VT_CONSOLE
2170
2171/*
2172 * Console on virtual terminal
2173 *
2174 * The console must be locked when we get here.
2175 */
2176
2177static void vt_console_print(struct console *co, const char *b, unsigned count)
2178{
2179 struct vc_data *vc = vc_cons[fg_console].d;
2180 unsigned char c;
2181 static unsigned long printing;
2182 const ushort *start;
2183 ushort cnt = 0;
2184 ushort myx;
2185
2186 /* console busy or not yet initialized */
2187 if (!printable || test_and_set_bit(0, &printing))
2188 return;
2189
2190 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2191 vc = vc_cons[kmsg_redirect - 1].d;
2192
2193 /* read `x' only after setting currcons properly (otherwise
2194 the `x' macro will read the x of the foreground console). */
2195 myx = vc->vc_x;
2196
2197 if (!vc_cons_allocated(fg_console)) {
2198 /* impossible */
2199 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2200 goto quit;
2201 }
2202
2203 if (vc->vc_mode != KD_TEXT)
2204 goto quit;
2205
2206 /* undraw cursor first */
2207 if (IS_FG(vc))
2208 hide_cursor(vc);
2209
2210 start = (ushort *)vc->vc_pos;
2211
2212 /* Contrived structure to try to emulate original need_wrap behaviour
2213 * Problems caused when we have need_wrap set on '\n' character */
2214 while (count--) {
2215 c = *b++;
2216 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2217 if (cnt > 0) {
2218 if (CON_IS_VISIBLE(vc))
2219 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2220 vc->vc_x += cnt;
2221 if (vc->vc_need_wrap)
2222 vc->vc_x--;
2223 cnt = 0;
2224 }
2225 if (c == 8) { /* backspace */
2226 bs(vc);
2227 start = (ushort *)vc->vc_pos;
2228 myx = vc->vc_x;
2229 continue;
2230 }
2231 if (c != 13)
2232 lf(vc);
2233 cr(vc);
2234 start = (ushort *)vc->vc_pos;
2235 myx = vc->vc_x;
2236 if (c == 10 || c == 13)
2237 continue;
2238 }
2239 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2240 cnt++;
2241 if (myx == vc->vc_cols - 1) {
2242 vc->vc_need_wrap = 1;
2243 continue;
2244 }
2245 vc->vc_pos += 2;
2246 myx++;
2247 }
2248 if (cnt > 0) {
2249 if (CON_IS_VISIBLE(vc))
2250 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2251 vc->vc_x += cnt;
2252 if (vc->vc_x == vc->vc_cols) {
2253 vc->vc_x--;
2254 vc->vc_need_wrap = 1;
2255 }
2256 }
2257 set_cursor(vc);
2258
2259quit:
2260 clear_bit(0, &printing);
2261}
2262
2263static struct tty_driver *vt_console_device(struct console *c, int *index)
2264{
2265 *index = c->index ? c->index-1 : fg_console;
2266 return console_driver;
2267}
2268
2269static struct console vt_console_driver = {
2270 .name = "tty",
2271 .write = vt_console_print,
2272 .device = vt_console_device,
2273 .unblank = unblank_screen,
2274 .flags = CON_PRINTBUFFER,
2275 .index = -1,
2276};
2277#endif
2278
2279/*
2280 * Handling of Linux-specific VC ioctls
2281 */
2282
2283/*
2284 * Generally a bit racy with respect to console_sem().
2285 *
2286 * There are some functions which don't need it.
2287 *
2288 * There are some functions which can sleep for arbitrary periods
2289 * (paste_selection) but we don't need the lock there anyway.
2290 *
2291 * set_selection has locking, and definitely needs it
2292 */
2293
2294int tioclinux(struct tty_struct *tty, unsigned long arg)
2295{
2296 char type, data;
2297 char __user *p = (char __user *)arg;
2298 int lines;
2299 int ret;
2300
2301 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2302 return -EINVAL;
2303 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2304 return -EPERM;
2305 if (get_user(type, p))
2306 return -EFAULT;
2307 ret = 0;
2308 switch (type)
2309 {
2310 case TIOCL_SETSEL:
2311 acquire_console_sem();
2312 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2313 release_console_sem();
2314 break;
2315 case TIOCL_PASTESEL:
2316 ret = paste_selection(tty);
2317 break;
2318 case TIOCL_UNBLANKSCREEN:
2d237c63 2319 acquire_console_sem();
1da177e4 2320 unblank_screen();
2d237c63 2321 release_console_sem();
1da177e4
LT		 2322 break;
2323 case TIOCL_SELLOADLUT:
2324 ret = sel_loadlut(p);
2325 break;
2326 case TIOCL_GETSHIFTSTATE:
2327
2328 /*
2329 * Make it possible to react to Shift+Mousebutton.
2330 * Note that 'shift_state' is an undocumented
2331 * kernel-internal variable; programs not closely
2332 * related to the kernel should not use this.
2333 */
2334 data = shift_state;
2335 ret = __put_user(data, p);
2336 break;
2337 case TIOCL_GETMOUSEREPORTING:
2338 data = mouse_reporting();
2339 ret = __put_user(data, p);
2340 break;
2341 case TIOCL_SETVESABLANK:
2342 set_vesa_blanking(p);
2343 break;
0ca07731
RW		 2344 case TIOCL_GETKMSGREDIRECT:
2345 data = kmsg_redirect;
2346 ret = __put_user(data, p);
2347 break;
1da177e4
LT		 2348 case TIOCL_SETKMSGREDIRECT:
2349 if (!capable(CAP_SYS_ADMIN)) {
2350 ret = -EPERM;
2351 } else {
2352 if (get_user(data, p+1))
2353 ret = -EFAULT;
2354 else
2355 kmsg_redirect = data;
2356 }
2357 break;
2358 case TIOCL_GETFGCONSOLE:
2359 ret = fg_console;
2360 break;
2361 case TIOCL_SCROLLCONSOLE:
2362 if (get_user(lines, (s32 __user *)(p+4))) {
2363 ret = -EFAULT;
2364 } else {
2365 scrollfront(vc_cons[fg_console].d, lines);
2366 ret = 0;
2367 }
2368 break;
2369 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2370 acquire_console_sem();
1da177e4
LT		 2371 ignore_poke = 1;
2372 do_blank_screen(0);
2d237c63 2373 release_console_sem();
1da177e4
LT		 2374 break;
2375 case TIOCL_BLANKEDSCREEN:
2376 ret = console_blanked;
2377 break;
2378 default:
2379 ret = -EINVAL;
2380 break;
2381 }
2382 return ret;
2383}
2384
2385/*
2386 * /dev/ttyN handling
2387 */
2388
2389static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2390{
2391 int retval;
2392
2393 retval = do_con_write(tty, buf, count);
2394 con_flush_chars(tty);
2395
2396 return retval;
2397}
2398
2399static void con_put_char(struct tty_struct *tty, unsigned char ch)
2400{
2401 if (in_interrupt())
2402 return; /* n_r3964 calls put_char() from interrupt context */
2403 do_con_write(tty, &ch, 1);
2404}
2405
2406static int con_write_room(struct tty_struct *tty)
2407{
2408 if (tty->stopped)
2409 return 0;
2410 return 4096; /* No limit, really; we're not buffering */
2411}
2412
2413static int con_chars_in_buffer(struct tty_struct *tty)
2414{
2415 return 0; /* we're not buffering */
2416}
2417
2418/*
2419 * con_throttle and con_unthrottle are only used for
2420 * paste_selection(), which has to stuff in a large number of
2421 * characters...
2422 */
2423static void con_throttle(struct tty_struct *tty)
2424{
2425}
2426
2427static void con_unthrottle(struct tty_struct *tty)
2428{
2429 struct vc_data *vc = tty->driver_data;
2430
2431 wake_up_interruptible(&vc->paste_wait);
2432}
2433
2434/*
2435 * Turn the Scroll-Lock LED on when the tty is stopped
2436 */
2437static void con_stop(struct tty_struct *tty)
2438{
2439 int console_num;
2440 if (!tty)
2441 return;
2442 console_num = tty->index;
2443 if (!vc_cons_allocated(console_num))
2444 return;
2445 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2446 set_leds();
2447}
2448
2449/*
2450 * Turn the Scroll-Lock LED off when the console is started
2451 */
2452static void con_start(struct tty_struct *tty)
2453{
2454 int console_num;
2455 if (!tty)
2456 return;
2457 console_num = tty->index;
2458 if (!vc_cons_allocated(console_num))
2459 return;
2460 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2461 set_leds();
2462}
2463
2464static void con_flush_chars(struct tty_struct *tty)
2465{
2466 struct vc_data *vc;
2467
2468 if (in_interrupt()) /* from flush_to_ldisc */
2469 return;
2470
2471 /* if we race with con_close(), vt may be null */
2472 acquire_console_sem();
2473 vc = tty->driver_data;
2474 if (vc)
2475 set_cursor(vc);
2476 release_console_sem();
2477}
2478
2479/*
2480 * Allocate the console screen memory.
2481 */
2482static int con_open(struct tty_struct *tty, struct file *filp)
2483{
2484 unsigned int currcons = tty->index;
2485 int ret = 0;
2486
2487 acquire_console_sem();
f786648b 2488 if (tty->driver_data == NULL) {
1da177e4
LT		 2489 ret = vc_allocate(currcons);
2490 if (ret == 0) {
2491 struct vc_data *vc = vc_cons[currcons].d;
2492 tty->driver_data = vc;
2493 vc->vc_tty = tty;
2494
2495 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2496 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2497 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2498 }
2499 release_console_sem();
2500 vcs_make_devfs(tty);
2501 return ret;
2502 }
2503 }
2504 release_console_sem();
2505 return ret;
2506}
2507
2508/*
70522e12 2509 * We take tty_mutex in here to prevent another thread from coming in via init_dev
1da177e4
LT		 2510 * and taking a ref against the tty while we're in the process of forgetting
2511 * about it and cleaning things up.
2512 *
2513 * This is because vcs_remove_devfs() can sleep and will drop the BKL.
2514 */
2515static void con_close(struct tty_struct *tty, struct file *filp)
2516{
70522e12 2517 mutex_lock(&tty_mutex);
1da177e4
LT		 2518 acquire_console_sem();
2519 if (tty && tty->count == 1) {
2520 struct vc_data *vc = tty->driver_data;
2521
2522 if (vc)
2523 vc->vc_tty = NULL;
2524 tty->driver_data = NULL;
2525 release_console_sem();
2526 vcs_remove_devfs(tty);
70522e12 2527 mutex_unlock(&tty_mutex);
1da177e4 2528 /*
70522e12 2529 * tty_mutex is released, but we still hold BKL, so there is
1da177e4
LT		 2530 * still exclusion against init_dev()
2531 */
2532 return;
2533 }
2534 release_console_sem();
70522e12 2535 mutex_unlock(&tty_mutex);
1da177e4
LT		 2536}
2537
2538static void vc_init(struct vc_data *vc, unsigned int rows,
2539 unsigned int cols, int do_clear)
2540{
2541 int j, k ;
2542
2543 vc->vc_cols = cols;
2544 vc->vc_rows = rows;
2545 vc->vc_size_row = cols << 1;
2546 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2547
2548 set_origin(vc);
2549 vc->vc_pos = vc->vc_origin;
2550 reset_vc(vc);
2551 for (j=k=0; j<16; j++) {
2552 vc->vc_palette[k++] = default_red[j] ;
2553 vc->vc_palette[k++] = default_grn[j] ;
2554 vc->vc_palette[k++] = default_blu[j] ;
2555 }
2556 vc->vc_def_color = 0x07; /* white */
2557 vc->vc_ulcolor = 0x0f; /* bold white */
2558 vc->vc_halfcolor = 0x08; /* grey */
2559 init_waitqueue_head(&vc->paste_wait);
2560 reset_terminal(vc, do_clear);
2561}
2562
2563/*
2564 * This routine initializes console interrupts, and does nothing
2565 * else. If you want the screen to clear, call tty_write with
2566 * the appropriate escape-sequence.
2567 */
2568
2569static int __init con_init(void)
2570{
2571 const char *display_desc = NULL;
2572 struct vc_data *vc;
3e795de7 2573 unsigned int currcons = 0, i;
1da177e4
LT		 2574
2575 acquire_console_sem();
2576
2577 if (conswitchp)
2578 display_desc = conswitchp->con_startup();
2579 if (!display_desc) {
2580 fg_console = 0;
2581 release_console_sem();
2582 return 0;
2583 }
2584
3e795de7
AD		 2585 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2586 struct con_driver *con_driver = &registered_con_driver[i];
2587
2588 if (con_driver->con == NULL) {
2589 con_driver->con = conswitchp;
2590 con_driver->desc = display_desc;
2591 con_driver->flag = CON_DRIVER_FLAG_INIT;
2592 con_driver->first = 0;
2593 con_driver->last = MAX_NR_CONSOLES - 1;
2594 break;
2595 }
2596 }
2597
2598 for (i = 0; i < MAX_NR_CONSOLES; i++)
2599 con_driver_map[i] = conswitchp;
2600
1da177e4
LT		 2601 init_timer(&console_timer);
2602 console_timer.function = blank_screen_t;
2603 if (blankinterval) {
2604 blank_state = blank_normal_wait;
2605 mod_timer(&console_timer, jiffies + blankinterval);
2606 }
2607
2608 /*
2609 * kmalloc is not running yet - we use the bootmem allocator.
2610 */
2611 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2612 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2613 visual_init(vc, currcons, 1);
2614 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2615 vc->vc_kmalloced = 0;
2616 vc_init(vc, vc->vc_rows, vc->vc_cols,
2617 currcons || !vc->vc_sw->con_save_screen);
2618 }
2619 currcons = fg_console = 0;
2620 master_display_fg = vc = vc_cons[currcons].d;
2621 set_origin(vc);
2622 save_screen(vc);
2623 gotoxy(vc, vc->vc_x, vc->vc_y);
2624 csi_J(vc, 0);
2625 update_screen(vc);
2626 printk("Console: %s %s %dx%d",
2627 vc->vc_can_do_color ? "colour" : "mono",
2628 display_desc, vc->vc_cols, vc->vc_rows);
2629 printable = 1;
2630 printk("\n");
2631
2632 release_console_sem();
2633
2634#ifdef CONFIG_VT_CONSOLE
2635 register_console(&vt_console_driver);
2636#endif
2637 return 0;
2638}
2639console_initcall(con_init);
2640
2641static struct tty_operations con_ops = {
2642 .open = con_open,
2643 .close = con_close,
2644 .write = con_write,
2645 .write_room = con_write_room,
2646 .put_char = con_put_char,
2647 .flush_chars = con_flush_chars,
2648 .chars_in_buffer = con_chars_in_buffer,
2649 .ioctl = vt_ioctl,
2650 .stop = con_stop,
2651 .start = con_start,
2652 .throttle = con_throttle,
2653 .unthrottle = con_unthrottle,
2654};
2655
2656int __init vty_init(void)
2657{
2658 vcs_init();
2659
2660 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2661 if (!console_driver)
2662 panic("Couldn't allocate console driver\n");
2663 console_driver->owner = THIS_MODULE;
2664 console_driver->devfs_name = "vc/";
2665 console_driver->name = "tty";
2666 console_driver->name_base = 1;
2667 console_driver->major = TTY_MAJOR;
2668 console_driver->minor_start = 1;
2669 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2670 console_driver->init_termios = tty_std_termios;
2671 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2672 tty_set_operations(console_driver, &con_ops);
2673 if (tty_register_driver(console_driver))
2674 panic("Couldn't register console driver\n");
2675
2676 kbd_init();
2677 console_map_init();
2678#ifdef CONFIG_PROM_CONSOLE
2679 prom_con_init();
2680#endif
2681#ifdef CONFIG_MDA_CONSOLE
2682 mda_console_init();
2683#endif
2684 return 0;
2685}
2686
2687#ifndef VT_SINGLE_DRIVER
2688
3e795de7
AD		 2689static int bind_con_driver(const struct consw *csw, int first, int last,
2690 int deflt)
1da177e4 2691{
3e795de7
AD		 2692 struct module *owner = csw->owner;
2693 const char *desc = NULL;
2694 struct con_driver *con_driver;
2695 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 2696
1da177e4
LT		 2697 if (!try_module_get(owner))
2698 return -ENODEV;
2699
1c8ce271 2700 acquire_console_sem();
1c8ce271 2701
3e795de7
AD		 2702 /* check if driver is registered */
2703 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2704 con_driver = &registered_con_driver[i];
2705
2706 if (con_driver->con == csw) {
2707 desc = con_driver->desc;
2708 retval = 0;
2709 break;
2710 }
2711 }
2712
2713 if (retval)
2714 goto err;
2715
2716 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
2717 csw->con_startup();
2718 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 2719 }
1c8ce271 2720
1da177e4
LT		 2721 if (deflt) {
2722 if (conswitchp)
2723 module_put(conswitchp->owner);
1c8ce271 2724
1da177e4
LT		 2725 __module_get(owner);
2726 conswitchp = csw;
2727 }
2728
3e795de7
AD		 2729 first = max(first, con_driver->first);
2730 last = min(last, con_driver->last);
2731
1da177e4
LT		 2732 for (i = first; i <= last; i++) {
2733 int old_was_color;
2734 struct vc_data *vc = vc_cons[i].d;
2735
2736 if (con_driver_map[i])
2737 module_put(con_driver_map[i]->owner);
2738 __module_get(owner);
2739 con_driver_map[i] = csw;
2740
2741 if (!vc || !vc->vc_sw)
2742 continue;
2743
2744 j = i;
1c8ce271 2745
4ee1acce
DH		 2746 if (CON_IS_VISIBLE(vc)) {
2747 k = i;
1da177e4 2748 save_screen(vc);
4ee1acce
DH		 2749 }
2750
1da177e4
LT		 2751 old_was_color = vc->vc_can_do_color;
2752 vc->vc_sw->con_deinit(vc);
2753 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 2754 visual_init(vc, i, 0);
1c8ce271 2755 set_origin(vc);
1da177e4
LT		 2756 update_attr(vc);
2757
2758 /* If the console changed between mono <-> color, then
2759 * the attributes in the screenbuf will be wrong. The
2760 * following resets all attributes to something sane.
2761 */
2762 if (old_was_color != vc->vc_can_do_color)
2763 clear_buffer_attributes(vc);
1da177e4 2764 }
4ee1acce 2765
1da177e4
LT		 2766 printk("Console: switching ");
2767 if (!deflt)
2768 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 2769 if (j >= 0) {
2770 struct vc_data *vc = vc_cons[j].d;
2771
1da177e4 2772 printk("to %s %s %dx%d\n",
4ee1acce
DH		 2773 vc->vc_can_do_color ? "colour" : "mono",
2774 desc, vc->vc_cols, vc->vc_rows);
2775
2776 if (k >= 0) {
2777 vc = vc_cons[k].d;
2778 update_screen(vc);
2779 }
2780 } else
1da177e4
LT		 2781 printk("to %s\n", desc);
2782
3e795de7
AD		 2783 retval = 0;
2784err:
1da177e4 2785 release_console_sem();
1da177e4 2786 module_put(owner);
3e795de7
AD		 2787 return retval;
2788};
1da177e4 2789
3e795de7
AD		 2790static int unbind_con_driver(const struct consw *csw, int first, int last,
2791 int deflt)
1da177e4 2792{
3e795de7
AD		 2793 struct module *owner = csw->owner;
2794 const struct consw *defcsw = NULL;
2795 struct con_driver *con_driver = NULL, *con_back = NULL;
2796 int i, retval = -ENODEV;
1da177e4 2797
3e795de7
AD		 2798 if (!try_module_get(owner))
2799 return -ENODEV;
2800
2801 acquire_console_sem();
2802
2803 /* check if driver is registered and if it is unbindable */
2804 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2805 con_driver = &registered_con_driver[i];
2806
2807 if (con_driver->con == csw &&
2808 con_driver->flag & CON_DRIVER_FLAG_BIND) {
2809 retval = 0;
2810 break;
2811 }
2812 }
2813
2814 if (retval) {
2815 release_console_sem();
2816 goto err;
2817 }
2818
2819 /* check if backup driver exists */
2820 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2821 con_back = &registered_con_driver[i];
2822
2823 if (con_back->con &&
2824 !(con_back->flag & CON_DRIVER_FLAG_BIND)) {
2825 defcsw = con_back->con;
2826 retval = 0;
2827 break;
2828 }
2829 }
2830
2831 if (retval) {
2832 release_console_sem();
2833 goto err;
2834 }
2835
2836 if (!con_is_bound(csw)) {
2837 release_console_sem();
2838 goto err;
2839 }
2840
2841 first = max(first, con_driver->first);
2842 last = min(last, con_driver->last);
2843
2844 for (i = first; i <= last; i++) {
1da177e4
LT		 2845 if (con_driver_map[i] == csw) {
2846 module_put(csw->owner);
2847 con_driver_map[i] = NULL;
2848 }
3e795de7
AD		 2849 }
2850
2851 if (!con_is_bound(defcsw)) {
2852 defcsw->con_startup();
2853 con_back->flag |= CON_DRIVER_FLAG_INIT;
2854 }
2855
2856 if (!con_is_bound(csw))
2857 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
2858
2859 release_console_sem();
2860 retval = bind_con_driver(defcsw, first, last, deflt);
2861err:
2862 module_put(owner);
2863 return retval;
2864
2865}
2866
2867/**
2868 * con_is_bound - checks if driver is bound to the console
2869 * @csw: console driver
2870 *
2871 * RETURNS: zero if unbound, nonzero if bound
2872 *
2873 * Drivers can call this and if zero, they should release
2874 * all resources allocated on con_startup()
2875 */
2876int con_is_bound(const struct consw *csw)
2877{
2878 int i, bound = 0;
2879
2880 for (i = 0; i < MAX_NR_CONSOLES; i++) {
2881 if (con_driver_map[i] == csw) {
2882 bound = 1;
2883 break;
2884 }
2885 }
2886
2887 return bound;
2888}
2889EXPORT_SYMBOL(con_is_bound);
2890
2891/**
2892 * register_con_driver - register console driver to console layer
2893 * @csw: console driver
2894 * @first: the first console to take over, minimum value is 0
2895 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
2896 *
2897 * DESCRIPTION: This function registers a console driver which can later
2898 * bind to a range of consoles specified by @first and @last. It will
2899 * also initialize the console driver by calling con_startup().
2900 */
2901int register_con_driver(const struct consw *csw, int first, int last)
2902{
2903 struct module *owner = csw->owner;
2904 struct con_driver *con_driver;
2905 const char *desc;
2906 int i, retval = 0;
2907
2908 if (!try_module_get(owner))
2909 return -ENODEV;
2910
2911 acquire_console_sem();
2912
2913 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2914 con_driver = &registered_con_driver[i];
2915
2916 /* already registered */
2917 if (con_driver->con == csw)
2918 retval = -EINVAL;
2919 }
2920
2921 if (retval)
2922 goto err;
2923
2924 desc = csw->con_startup();
2925
2926 if (!desc)
2927 goto err;
2928
2929 retval = -EINVAL;
2930
2931 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2932 con_driver = &registered_con_driver[i];
2933
2934 if (con_driver->con == NULL) {
2935 con_driver->con = csw;
2936 con_driver->desc = desc;
2937 con_driver->flag = CON_DRIVER_FLAG_BIND |
2938 CON_DRIVER_FLAG_INIT;
2939 con_driver->first = first;
2940 con_driver->last = last;
2941 retval = 0;
2942 break;
2943 }
2944 }
2945
2946err:
2947 release_console_sem();
2948 module_put(owner);
2949 return retval;
2950}
2951EXPORT_SYMBOL(register_con_driver);
2952
2953/**
2954 * unregister_con_driver - unregister console driver from console layer
2955 * @csw: console driver
2956 *
2957 * DESCRIPTION: All drivers that registers to the console layer must
2958 * call this function upon exit, or if the console driver is in a state
2959 * where it won't be able to handle console services, such as the
2960 * framebuffer console without loaded framebuffer drivers.
2961 *
2962 * The driver must unbind first prior to unregistration.
2963 */
2964int unregister_con_driver(const struct consw *csw)
2965{
2966 int i, retval = -ENODEV;
2967
2968 acquire_console_sem();
2969
2970 /* cannot unregister a bound driver */
2971 if (con_is_bound(csw))
2972 goto err;
2973
2974 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2975 struct con_driver *con_driver = &registered_con_driver[i];
2976
2977 if (con_driver->con == csw &&
2978 con_driver->flag & CON_DRIVER_FLAG_BIND) {
2979 con_driver->con = NULL;
2980 con_driver->desc = NULL;
2981 con_driver->flag = 0;
2982 con_driver->first = 0;
2983 con_driver->last = 0;
2984 retval = 0;
2985 break;
2986 }
2987 }
2988
2989err:
2990 release_console_sem();
2991 return retval;
2992}
2993EXPORT_SYMBOL(unregister_con_driver);
2994
2995/*
2996 * If we support more console drivers, this function is used
2997 * when a driver wants to take over some existing consoles
2998 * and become default driver for newly opened ones.
2999 *
3000 * take_over_console is basically a register followed by unbind
3001 */
3002int take_over_console(const struct consw *csw, int first, int last, int deflt)
3003{
3004 int err;
3005
3006 err = register_con_driver(csw, first, last);
3007
3008 if (!err)
3009 err = bind_con_driver(csw, first, last, deflt);
3010
3011 return err;
3012}
3013
3014/*
3015 * give_up_console is a wrapper to unregister_con_driver. It will only
3016 * work if driver is fully unbound.
3017 */
3018void give_up_console(const struct consw *csw)
3019{
3020 unregister_con_driver(csw);
3021}
3022
3023/*
3024 * this function is intended to be called by the tty layer only
3025 */
3026int vt_bind(int index)
3027{
3028 const struct consw *defcsw = NULL, *csw = NULL;
3029 struct con_driver *con;
3030 int i, more = 1, first = -1, last = -1, deflt = 0;
3031
3032 if (index >= MAX_NR_CON_DRIVER)
3033 goto err;
3034
3035 con = &registered_con_driver[index];
3036
3037 if (!con->con || !(con->flag & CON_DRIVER_FLAG_BIND))
3038 goto err;
3039
3040 csw = con->con;
3041
3042 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3043 struct con_driver *con = &registered_con_driver[i];
3044
3045 if (con->con && !(con->flag & CON_DRIVER_FLAG_BIND)) {
3046 defcsw = con->con;
3047 break;
3048 }
3049 }
1da177e4 3050
3e795de7
AD		 3051 if (!defcsw)
3052 goto err;
3053
3054 while (more) {
3055 more = 0;
3056
3057 for (i = con->first; i <= con->last; i++) {
3058 if (con_driver_map[i] == defcsw) {
3059 if (first == -1)
3060 first = i;
3061 last = i;
3062 more = 1;
3063 } else if (first != -1)
3064 break;
3065 }
3066
3067 if (first == 0 && last == MAX_NR_CONSOLES -1)
1c8ce271 3068 deflt = 1;
3e795de7
AD		 3069
3070 if (first != -1)
3071 bind_con_driver(csw, first, last, deflt);
3072
3073 first = -1;
3074 last = -1;
3075 deflt = 0;
1c8ce271 3076 }
3e795de7
AD		 3077
3078err:
3079 return 0;
3080}
3081
3082/*
3083 * this function is intended to be called by the tty layer only
3084 */
3085int vt_unbind(int index)
3086{
3087 const struct consw *csw = NULL;
3088 struct con_driver *con;
3089 int i, more = 1, first = -1, last = -1, deflt = 0;
3090
3091 if (index >= MAX_NR_CON_DRIVER)
3092 goto err;
3093
3094 con = &registered_con_driver[index];
3095
3096 if (!con->con || !(con->flag & CON_DRIVER_FLAG_BIND))
3097 goto err;
3098
3099 csw = con->con;
3100
3101 while (more) {
3102 more = 0;
3103
3104 for (i = con->first; i <= con->last; i++) {
3105 if (con_driver_map[i] == csw) {
3106 if (first == -1)
3107 first = i;
3108 last = i;
3109 more = 1;
3110 } else if (first != -1)
3111 break;
3112 }
3113
3114 if (first == 0 && last == MAX_NR_CONSOLES -1)
3115 deflt = 1;
3116
3117 if (first != -1)
3118 unbind_con_driver(csw, first, last, deflt);
3119
3120 first = -1;
3121 last = -1;
3122 deflt = 0;
3123 }
3124
3125err:
3126 return 0;
3127}
3128#else
3129int vt_bind(int index)
3130{
3131 return 0;
3132}
3133
3134int vt_unbind(int index)
3135{
3136 return 0;
1c8ce271 3137}
1da177e4
LT		 3138#endif
3139
3e795de7
AD		 3140/*
3141 * this function is intended to be called by the tty layer only
3142 */
3143int vt_show_drivers(char *buf)
3144{
3145 int i, j, read, offset = 0, cnt = PAGE_SIZE;
3146
3147 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3148 struct con_driver *con_driver = &registered_con_driver[i];
3149
3150 if (con_driver->con != NULL) {
3151 int sys = 0;
3152
3153 if (con_driver->flag & CON_DRIVER_FLAG_BIND) {
3154 sys = 2;
3155
3156 for (j = 0; j < MAX_NR_CONSOLES; j++) {
3157 if (con_driver_map[j] ==
3158 con_driver->con) {
3159 sys = 1;
3160 break;
3161 }
3162 }
3163 }
3164
3165 read = snprintf(buf + offset, cnt, "%i %s: %s\n",
3166 i, (sys) ? ((sys == 1) ? "B" : "U") :
3167 "S", con_driver->desc);
3168 offset += read;
3169 cnt -= read;
3170 }
3171 }
3172
3173 return offset;
3174}
3175
1da177e4
LT		 3176/*
3177 * Screen blanking
3178 */
3179
3180static void set_vesa_blanking(char __user *p)
3181{
3182 unsigned int mode;
3183 get_user(mode, p + 1);
3184 vesa_blank_mode = (mode < 4) ? mode : 0;
3185}
3186
1da177e4
LT		 3187void do_blank_screen(int entering_gfx)
3188{
3189 struct vc_data *vc = vc_cons[fg_console].d;
3190 int i;
3191
3192 WARN_CONSOLE_UNLOCKED();
3193
3194 if (console_blanked) {
3195 if (blank_state == blank_vesa_wait) {
3196 blank_state = blank_off;
d060a321 3197 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3198 }
3199 return;
3200 }
3201 if (blank_state != blank_normal_wait)
3202 return;
3203 blank_state = blank_off;
3204
3205 /* entering graphics mode? */
3206 if (entering_gfx) {
3207 hide_cursor(vc);
3208 save_screen(vc);
3209 vc->vc_sw->con_blank(vc, -1, 1);
3210 console_blanked = fg_console + 1;
3211 set_origin(vc);
3212 return;
3213 }
3214
3215 /* don't blank graphics */
3216 if (vc->vc_mode != KD_TEXT) {
3217 console_blanked = fg_console + 1;
3218 return;
3219 }
3220
3221 hide_cursor(vc);
3222 del_timer_sync(&console_timer);
3223 blank_timer_expired = 0;
3224
3225 save_screen(vc);
3226 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3227 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3228 console_blanked = fg_console + 1;
3229 if (i)
3230 set_origin(vc);
3231
3232 if (console_blank_hook && console_blank_hook(1))
3233 return;
3234
d060a321 3235 if (vesa_off_interval && vesa_blank_mode) {
030babac 3236 blank_state = blank_vesa_wait;
1da177e4
LT		 3237 mod_timer(&console_timer, jiffies + vesa_off_interval);
3238 }
1da177e4
LT		 3239}
3240EXPORT_SYMBOL(do_blank_screen);
3241
3242/*
3243 * Called by timer as well as from vt_console_driver
3244 */
3245void do_unblank_screen(int leaving_gfx)
3246{
3247 struct vc_data *vc;
3248
3249 /* This should now always be called from a "sane" (read: can schedule)
3250 * context for the sake of the low level drivers, except in the special
3251 * case of oops_in_progress
3252 */
3253 if (!oops_in_progress)
3254 might_sleep();
3255
3256 WARN_CONSOLE_UNLOCKED();
3257
3258 ignore_poke = 0;
3259 if (!console_blanked)
3260 return;
3261 if (!vc_cons_allocated(fg_console)) {
3262 /* impossible */
3263 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3264 return;
3265 }
3266 vc = vc_cons[fg_console].d;
3267 if (vc->vc_mode != KD_TEXT)
3268 return; /* but leave console_blanked != 0 */
3269
3270 if (blankinterval) {
3271 mod_timer(&console_timer, jiffies + blankinterval);
3272 blank_state = blank_normal_wait;
3273 }
3274
3275 console_blanked = 0;
3276 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
3277 /* Low-level driver cannot restore -> do it ourselves */
3278 update_screen(vc);
3279 if (console_blank_hook)
3280 console_blank_hook(0);
3281 set_palette(vc);
3282 set_cursor(vc);
3283}
3284EXPORT_SYMBOL(do_unblank_screen);
3285
3286/*
3287 * This is called by the outside world to cause a forced unblank, mostly for
3288 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3289 * call it with 1 as an argument and so force a mode restore... that may kill
3290 * X or at least garbage the screen but would also make the Oops visible...
3291 */
3292void unblank_screen(void)
3293{
3294 do_unblank_screen(0);
3295}
3296
3297/*
70522e12 3298 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3299 * (console operations can still happen at irq time, but only from printk which
70522e12 3300 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3301 */
3302static void blank_screen_t(unsigned long dummy)
3303{
cc63b1e1
JB		 3304 if (unlikely(!keventd_up())) {
3305 mod_timer(&console_timer, jiffies + blankinterval);
3306 return;
3307 }
1da177e4
LT		 3308 blank_timer_expired = 1;
3309 schedule_work(&console_work);
3310}
3311
3312void poke_blanked_console(void)
3313{
3314 WARN_CONSOLE_UNLOCKED();
3315
3316 /* Add this so we quickly catch whoever might call us in a non
3317 * safe context. Nowadays, unblank_screen() isn't to be called in
3318 * atomic contexts and is allowed to schedule (with the special case
3319 * of oops_in_progress, but that isn't of any concern for this
3320 * function. --BenH.
3321 */
3322 might_sleep();
3323
3324 /* This isn't perfectly race free, but a race here would be mostly harmless,
3325 * at worse, we'll do a spurrious blank and it's unlikely
3326 */
3327 del_timer(&console_timer);
3328 blank_timer_expired = 0;
3329
3330 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3331 return;
3332 if (console_blanked)
3333 unblank_screen();
3334 else if (blankinterval) {
3335 mod_timer(&console_timer, jiffies + blankinterval);
3336 blank_state = blank_normal_wait;
3337 }
3338}
3339
3340/*
3341 * Palettes
3342 */
3343
3344static void set_palette(struct vc_data *vc)
3345{
3346 WARN_CONSOLE_UNLOCKED();
3347
3348 if (vc->vc_mode != KD_GRAPHICS)
3349 vc->vc_sw->con_set_palette(vc, color_table);
3350}
3351
3352static int set_get_cmap(unsigned char __user *arg, int set)
3353{
3354 int i, j, k;
3355
3356 WARN_CONSOLE_UNLOCKED();
3357
3358 for (i = 0; i < 16; i++)
3359 if (set) {
3360 get_user(default_red[i], arg++);
3361 get_user(default_grn[i], arg++);
3362 get_user(default_blu[i], arg++);
3363 } else {
3364 put_user(default_red[i], arg++);
3365 put_user(default_grn[i], arg++);
3366 put_user(default_blu[i], arg++);
3367 }
3368 if (set) {
3369 for (i = 0; i < MAX_NR_CONSOLES; i++)
3370 if (vc_cons_allocated(i)) {
3371 for (j = k = 0; j < 16; j++) {
3372 vc_cons[i].d->vc_palette[k++] = default_red[j];
3373 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3374 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3375 }
3376 set_palette(vc_cons[i].d);
3377 }
3378 }
3379 return 0;
3380}
3381
3382/*
3383 * Load palette into the DAC registers. arg points to a colour
3384 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3385 */
3386
3387int con_set_cmap(unsigned char __user *arg)
3388{
3389 int rc;
3390
3391 acquire_console_sem();
3392 rc = set_get_cmap (arg,1);
3393 release_console_sem();
3394
3395 return rc;
3396}
3397
3398int con_get_cmap(unsigned char __user *arg)
3399{
3400 int rc;
3401
3402 acquire_console_sem();
3403 rc = set_get_cmap (arg,0);
3404 release_console_sem();
3405
3406 return rc;
3407}
3408
3409void reset_palette(struct vc_data *vc)
3410{
3411 int j, k;
3412 for (j=k=0; j<16; j++) {
3413 vc->vc_palette[k++] = default_red[j];
3414 vc->vc_palette[k++] = default_grn[j];
3415 vc->vc_palette[k++] = default_blu[j];
3416 }
3417 set_palette(vc);
3418}
3419
3420/*
3421 * Font switching
3422 *
3423 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3424 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3425 * depending on width) reserved for each character which is kinda wasty, but
3426 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3427 * is upto the actual low-level console-driver convert data into its favorite
3428 * format (maybe we should add a `fontoffset' field to the `display'
3429 * structure so we won't have to convert the fontdata all the time.
3430 * /Jes
3431 */
3432
3433#define max_font_size 65536
3434
3435static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3436{
3437 struct console_font font;
3438 int rc = -EINVAL;
3439 int c;
3440
3441 if (vc->vc_mode != KD_TEXT)
3442 return -EINVAL;
3443
3444 if (op->data) {
3445 font.data = kmalloc(max_font_size, GFP_KERNEL);
3446 if (!font.data)
3447 return -ENOMEM;
3448 } else
3449 font.data = NULL;
3450
3451 acquire_console_sem();
3452 if (vc->vc_sw->con_font_get)
3453 rc = vc->vc_sw->con_font_get(vc, &font);
3454 else
3455 rc = -ENOSYS;
3456 release_console_sem();
3457
3458 if (rc)
3459 goto out;
3460
3461 c = (font.width+7)/8 * 32 * font.charcount;
3462
3463 if (op->data && font.charcount > op->charcount)
3464 rc = -ENOSPC;
3465 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3466 if (font.width > op->width || font.height > op->height)
3467 rc = -ENOSPC;
3468 } else {
3469 if (font.width != 8)
3470 rc = -EIO;
3471 else if ((op->height && font.height > op->height) ||
3472 font.height > 32)
3473 rc = -ENOSPC;
3474 }
3475 if (rc)
3476 goto out;
3477
3478 op->height = font.height;
3479 op->width = font.width;
3480 op->charcount = font.charcount;
3481
3482 if (op->data && copy_to_user(op->data, font.data, c))
3483 rc = -EFAULT;
3484
3485out:
3486 kfree(font.data);
3487 return rc;
3488}
3489
3490static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3491{
3492 struct console_font font;
3493 int rc = -EINVAL;
3494 int size;
3495
3496 if (vc->vc_mode != KD_TEXT)
3497 return -EINVAL;
3498 if (!op->data)
3499 return -EINVAL;
3500 if (op->charcount > 512)
3501 return -EINVAL;
3502 if (!op->height) { /* Need to guess font height [compat] */
3503 int h, i;
3504 u8 __user *charmap = op->data;
3505 u8 tmp;
3506
3507 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3508 so that we can get rid of this soon */
3509 if (!(op->flags & KD_FONT_FLAG_OLD))
3510 return -EINVAL;
3511 for (h = 32; h > 0; h--)
3512 for (i = 0; i < op->charcount; i++) {
3513 if (get_user(tmp, &charmap[32*i+h-1]))
3514 return -EFAULT;
3515 if (tmp)
3516 goto nonzero;
3517 }
3518 return -EINVAL;
3519 nonzero:
3520 op->height = h;
3521 }
3522 if (op->width <= 0 || op->width > 32 || op->height > 32)
3523 return -EINVAL;
3524 size = (op->width+7)/8 * 32 * op->charcount;
3525 if (size > max_font_size)
3526 return -ENOSPC;
3527 font.charcount = op->charcount;
3528 font.height = op->height;
3529 font.width = op->width;
3530 font.data = kmalloc(size, GFP_KERNEL);
3531 if (!font.data)
3532 return -ENOMEM;
3533 if (copy_from_user(font.data, op->data, size)) {
3534 kfree(font.data);
3535 return -EFAULT;
3536 }
3537 acquire_console_sem();
3538 if (vc->vc_sw->con_font_set)
3539 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3540 else
3541 rc = -ENOSYS;
3542 release_console_sem();
3543 kfree(font.data);
3544 return rc;
3545}
3546
3547static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3548{
3549 struct console_font font = {.width = op->width, .height = op->height};
3550 char name[MAX_FONT_NAME];
3551 char *s = name;
3552 int rc;
3553
3554 if (vc->vc_mode != KD_TEXT)
3555 return -EINVAL;
3556
3557 if (!op->data)
3558 s = NULL;
3559 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3560 return -EFAULT;
3561 else
3562 name[MAX_FONT_NAME - 1] = 0;
3563
3564 acquire_console_sem();
3565 if (vc->vc_sw->con_font_default)
3566 rc = vc->vc_sw->con_font_default(vc, &font, s);
3567 else
3568 rc = -ENOSYS;
3569 release_console_sem();
3570 if (!rc) {
3571 op->width = font.width;
3572 op->height = font.height;
3573 }
3574 return rc;
3575}
3576
3577static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3578{
3579 int con = op->height;
3580 int rc;
3581
3582 if (vc->vc_mode != KD_TEXT)
3583 return -EINVAL;
3584
3585 acquire_console_sem();
3586 if (!vc->vc_sw->con_font_copy)
3587 rc = -ENOSYS;
3588 else if (con < 0 || !vc_cons_allocated(con))
3589 rc = -ENOTTY;
3590 else if (con == vc->vc_num) /* nothing to do */
3591 rc = 0;
3592 else
3593 rc = vc->vc_sw->con_font_copy(vc, con);
3594 release_console_sem();
3595 return rc;
3596}
3597
3598int con_font_op(struct vc_data *vc, struct console_font_op *op)
3599{
3600 switch (op->op) {
3601 case KD_FONT_OP_SET:
3602 return con_font_set(vc, op);
3603 case KD_FONT_OP_GET:
3604 return con_font_get(vc, op);
3605 case KD_FONT_OP_SET_DEFAULT:
3606 return con_font_default(vc, op);
3607 case KD_FONT_OP_COPY:
3608 return con_font_copy(vc, op);
3609 }
3610 return -ENOSYS;
3611}
3612
3613/*
3614 * Interface exported to selection and vcs.
3615 */
3616
3617/* used by selection */
3618u16 screen_glyph(struct vc_data *vc, int offset)
3619{
3620 u16 w = scr_readw(screenpos(vc, offset, 1));
3621 u16 c = w & 0xff;
3622
3623 if (w & vc->vc_hi_font_mask)
3624 c |= 0x100;
3625 return c;
3626}
3627
3628/* used by vcs - note the word offset */
3629unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3630{
3631 return screenpos(vc, 2 * w_offset, viewed);
3632}
3633
3634void getconsxy(struct vc_data *vc, unsigned char *p)
3635{
3636 p[0] = vc->vc_x;
3637 p[1] = vc->vc_y;
3638}
3639
3640void putconsxy(struct vc_data *vc, unsigned char *p)
3641{
9477e260 3642 hide_cursor(vc);
1da177e4
LT		 3643 gotoxy(vc, p[0], p[1]);
3644 set_cursor(vc);
3645}
3646
3647u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3648{
3649 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3650 return softcursor_original;
3651 return scr_readw(org);
3652}
3653
3654void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3655{
3656 scr_writew(val, org);
3657 if ((unsigned long)org == vc->vc_pos) {
3658 softcursor_original = -1;
3659 add_softcursor(vc);
3660 }
3661}
3662
3663/*
3664 * Visible symbols for modules
3665 */
3666
3667EXPORT_SYMBOL(color_table);
3668EXPORT_SYMBOL(default_red);
3669EXPORT_SYMBOL(default_grn);
3670EXPORT_SYMBOL(default_blu);
3671EXPORT_SYMBOL(update_region);
3672EXPORT_SYMBOL(redraw_screen);
3673EXPORT_SYMBOL(vc_resize);
3674EXPORT_SYMBOL(fg_console);
3675EXPORT_SYMBOL(console_blank_hook);
3676EXPORT_SYMBOL(console_blanked);
3677EXPORT_SYMBOL(vc_cons);
3678#ifndef VT_SINGLE_DRIVER
3679EXPORT_SYMBOL(take_over_console);
3680EXPORT_SYMBOL(give_up_console);
3681#endif
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