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-rw-r--r--drivers/char/vt.c3242
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diff --git a/drivers/char/vt.c b/drivers/char/vt.c
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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
101
102const struct consw *conswitchp;
103
104/* A bitmap for codes <32. A bit of 1 indicates that the code
105 * corresponding to that bit number invokes some special action
106 * (such as cursor movement) and should not be displayed as a
107 * glyph unless the disp_ctrl mode is explicitly enabled.
108 */
109#define CTRL_ACTION 0x0d00ff81
110#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
111
112/*
113 * Here is the default bell parameters: 750HZ, 1/8th of a second
114 */
115#define DEFAULT_BELL_PITCH 750
116#define DEFAULT_BELL_DURATION (HZ/8)
117
118extern void vcs_make_devfs(struct tty_struct *tty);
119extern void vcs_remove_devfs(struct tty_struct *tty);
120
121extern void console_map_init(void);
122#ifdef CONFIG_PROM_CONSOLE
123extern void prom_con_init(void);
124#endif
125#ifdef CONFIG_MDA_CONSOLE
126extern int mda_console_init(void);
127#endif
128
129struct vc vc_cons [MAX_NR_CONSOLES];
130
131#ifndef VT_SINGLE_DRIVER
132static const struct consw *con_driver_map[MAX_NR_CONSOLES];
133#endif
134
135static int con_open(struct tty_struct *, struct file *);
136static void vc_init(struct vc_data *vc, unsigned int rows,
137 unsigned int cols, int do_clear);
138static void gotoxy(struct vc_data *vc, int new_x, int new_y);
139static void save_cur(struct vc_data *vc);
140static void reset_terminal(struct vc_data *vc, int do_clear);
141static void con_flush_chars(struct tty_struct *tty);
142static void set_vesa_blanking(char __user *p);
143static void set_cursor(struct vc_data *vc);
144static void hide_cursor(struct vc_data *vc);
145static void console_callback(void *ignored);
146static void blank_screen_t(unsigned long dummy);
147static void set_palette(struct vc_data *vc);
148
149static int printable; /* Is console ready for printing? */
150
151/*
152 * ignore_poke: don't unblank the screen when things are typed. This is
153 * mainly for the privacy of braille terminal users.
154 */
155static int ignore_poke;
156
157int do_poke_blanked_console;
158int console_blanked;
159
160static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
161static int blankinterval = 10*60*HZ;
162static int vesa_off_interval;
163
164static DECLARE_WORK(console_work, console_callback, NULL);
165
166/*
167 * fg_console is the current virtual console,
168 * last_console is the last used one,
169 * want_console is the console we want to switch to,
170 * kmsg_redirect is the console for kernel messages,
171 */
172int fg_console;
173int last_console;
174int want_console = -1;
175int kmsg_redirect;
176
177/*
178 * For each existing display, we have a pointer to console currently visible
179 * on that display, allowing consoles other than fg_console to be refreshed
180 * appropriately. Unless the low-level driver supplies its own display_fg
181 * variable, we use this one for the "master display".
182 */
183static struct vc_data *master_display_fg;
184
185/*
186 * Unfortunately, we need to delay tty echo when we're currently writing to the
187 * console since the code is (and always was) not re-entrant, so we schedule
188 * all flip requests to process context with schedule-task() and run it from
189 * console_callback().
190 */
191
192/*
193 * For the same reason, we defer scrollback to the console callback.
194 */
195static int scrollback_delta;
196
197/*
198 * Hook so that the power management routines can (un)blank
199 * the console on our behalf.
200 */
201int (*console_blank_hook)(int);
202
203static struct timer_list console_timer;
204static int blank_state;
205static int blank_timer_expired;
206enum {
207 blank_off = 0,
208 blank_normal_wait,
209 blank_vesa_wait,
210};
211
212/*
213 * Low-Level Functions
214 */
215
216#define IS_FG(vc) ((vc)->vc_num == fg_console)
217
218#ifdef VT_BUF_VRAM_ONLY
219#define DO_UPDATE(vc) 0
220#else
221#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
222#endif
223
224static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
225{
226 unsigned short *p;
227
228 if (!viewed)
229 p = (unsigned short *)(vc->vc_origin + offset);
230 else if (!vc->vc_sw->con_screen_pos)
231 p = (unsigned short *)(vc->vc_visible_origin + offset);
232 else
233 p = vc->vc_sw->con_screen_pos(vc, offset);
234 return p;
235}
236
237static inline void scrolldelta(int lines)
238{
239 scrollback_delta += lines;
240 schedule_console_callback();
241}
242
243void schedule_console_callback(void)
244{
245 schedule_work(&console_work);
246}
247
248static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
249{
250 unsigned short *d, *s;
251
252 if (t+nr >= b)
253 nr = b - t - 1;
254 if (b > vc->vc_rows || t >= b || nr < 1)
255 return;
256 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
257 return;
258 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
259 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
260 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
261 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
262 vc->vc_size_row * nr);
263}
264
265static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
266{
267 unsigned short *s;
268 unsigned int step;
269
270 if (t+nr >= b)
271 nr = b - t - 1;
272 if (b > vc->vc_rows || t >= b || nr < 1)
273 return;
274 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
275 return;
276 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
277 step = vc->vc_cols * nr;
278 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
279 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
280}
281
282static void do_update_region(struct vc_data *vc, unsigned long start, int count)
283{
284#ifndef VT_BUF_VRAM_ONLY
285 unsigned int xx, yy, offset;
286 u16 *p;
287
288 p = (u16 *) start;
289 if (!vc->vc_sw->con_getxy) {
290 offset = (start - vc->vc_origin) / 2;
291 xx = offset % vc->vc_cols;
292 yy = offset / vc->vc_cols;
293 } else {
294 int nxx, nyy;
295 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
296 xx = nxx; yy = nyy;
297 }
298 for(;;) {
299 u16 attrib = scr_readw(p) & 0xff00;
300 int startx = xx;
301 u16 *q = p;
302 while (xx < vc->vc_cols && count) {
303 if (attrib != (scr_readw(p) & 0xff00)) {
304 if (p > q)
305 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
306 startx = xx;
307 q = p;
308 attrib = scr_readw(p) & 0xff00;
309 }
310 p++;
311 xx++;
312 count--;
313 }
314 if (p > q)
315 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
316 if (!count)
317 break;
318 xx = 0;
319 yy++;
320 if (vc->vc_sw->con_getxy) {
321 p = (u16 *)start;
322 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
323 }
324 }
325#endif
326}
327
328void update_region(struct vc_data *vc, unsigned long start, int count)
329{
330 WARN_CONSOLE_UNLOCKED();
331
332 if (DO_UPDATE(vc)) {
333 hide_cursor(vc);
334 do_update_region(vc, start, count);
335 set_cursor(vc);
336 }
337}
338
339/* Structure of attributes is hardware-dependent */
340
341static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
342{
343 if (vc->vc_sw->con_build_attr)
344 return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
345
346#ifndef VT_BUF_VRAM_ONLY
347/*
348 * ++roman: I completely changed the attribute format for monochrome
349 * mode (!can_do_color). The formerly used MDA (monochrome display
350 * adapter) format didn't allow the combination of certain effects.
351 * Now the attribute is just a bit vector:
352 * Bit 0..1: intensity (0..2)
353 * Bit 2 : underline
354 * Bit 3 : reverse
355 * Bit 7 : blink
356 */
357 {
358 u8 a = vc->vc_color;
359 if (!vc->vc_can_do_color)
360 return _intensity |
361 (_underline ? 4 : 0) |
362 (_reverse ? 8 : 0) |
363 (_blink ? 0x80 : 0);
364 if (_underline)
365 a = (a & 0xf0) | vc->vc_ulcolor;
366 else if (_intensity == 0)
367 a = (a & 0xf0) | vc->vc_ulcolor;
368 if (_reverse)
369 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
370 if (_blink)
371 a ^= 0x80;
372 if (_intensity == 2)
373 a ^= 0x08;
374 if (vc->vc_hi_font_mask == 0x100)
375 a <<= 1;
376 return a;
377 }
378#else
379 return 0;
380#endif
381}
382
383static void update_attr(struct vc_data *vc)
384{
385 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
386 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
387}
388
389/* Note: inverting the screen twice should revert to the original state */
390void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
391{
392 unsigned short *p;
393
394 WARN_CONSOLE_UNLOCKED();
395
396 count /= 2;
397 p = screenpos(vc, offset, viewed);
398 if (vc->vc_sw->con_invert_region)
399 vc->vc_sw->con_invert_region(vc, p, count);
400#ifndef VT_BUF_VRAM_ONLY
401 else {
402 u16 *q = p;
403 int cnt = count;
404 u16 a;
405
406 if (!vc->vc_can_do_color) {
407 while (cnt--) {
408 a = scr_readw(q);
409 a ^= 0x0800;
410 scr_writew(a, q);
411 q++;
412 }
413 } else if (vc->vc_hi_font_mask == 0x100) {
414 while (cnt--) {
415 a = scr_readw(q);
416 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
417 scr_writew(a, q);
418 q++;
419 }
420 } else {
421 while (cnt--) {
422 a = scr_readw(q);
423 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
424 scr_writew(a, q);
425 q++;
426 }
427 }
428 }
429#endif
430 if (DO_UPDATE(vc))
431 do_update_region(vc, (unsigned long) p, count);
432}
433
434/* used by selection: complement pointer position */
435void complement_pos(struct vc_data *vc, int offset)
436{
437 static unsigned short *p;
438 static unsigned short old;
439 static unsigned short oldx, oldy;
440
441 WARN_CONSOLE_UNLOCKED();
442
443 if (p) {
444 scr_writew(old, p);
445 if (DO_UPDATE(vc))
446 vc->vc_sw->con_putc(vc, old, oldy, oldx);
447 }
448 if (offset == -1)
449 p = NULL;
450 else {
451 unsigned short new;
452 p = screenpos(vc, offset, 1);
453 old = scr_readw(p);
454 new = old ^ vc->vc_complement_mask;
455 scr_writew(new, p);
456 if (DO_UPDATE(vc)) {
457 oldx = (offset >> 1) % vc->vc_cols;
458 oldy = (offset >> 1) / vc->vc_cols;
459 vc->vc_sw->con_putc(vc, new, oldy, oldx);
460 }
461 }
462}
463
464static void insert_char(struct vc_data *vc, unsigned int nr)
465{
466 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
467
468 p = q + vc->vc_cols - nr - vc->vc_x;
469 while (--p >= q)
470 scr_writew(scr_readw(p), p + nr);
471 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
472 vc->vc_need_wrap = 0;
473 if (DO_UPDATE(vc)) {
474 unsigned short oldattr = vc->vc_attr;
475 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
476 vc->vc_cols - vc->vc_x - nr);
477 vc->vc_attr = vc->vc_video_erase_char >> 8;
478 while (nr--)
479 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
480 vc->vc_attr = oldattr;
481 }
482}
483
484static void delete_char(struct vc_data *vc, unsigned int nr)
485{
486 unsigned int i = vc->vc_x;
487 unsigned short *p = (unsigned short *)vc->vc_pos;
488
489 while (++i <= vc->vc_cols - nr) {
490 scr_writew(scr_readw(p+nr), p);
491 p++;
492 }
493 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
494 vc->vc_need_wrap = 0;
495 if (DO_UPDATE(vc)) {
496 unsigned short oldattr = vc->vc_attr;
497 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
498 vc->vc_cols - vc->vc_x - nr);
499 vc->vc_attr = vc->vc_video_erase_char >> 8;
500 while (nr--)
501 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
502 vc->vc_cols - 1 - nr);
503 vc->vc_attr = oldattr;
504 }
505}
506
507static int softcursor_original;
508
509static void add_softcursor(struct vc_data *vc)
510{
511 int i = scr_readw((u16 *) vc->vc_pos);
512 u32 type = vc->vc_cursor_type;
513
514 if (! (type & 0x10)) return;
515 if (softcursor_original != -1) return;
516 softcursor_original = i;
517 i |= ((type >> 8) & 0xff00 );
518 i ^= ((type) & 0xff00 );
519 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
520 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
521 scr_writew(i, (u16 *) vc->vc_pos);
522 if (DO_UPDATE(vc))
523 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
524}
525
526static void hide_softcursor(struct vc_data *vc)
527{
528 if (softcursor_original != -1) {
529 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
530 if (DO_UPDATE(vc))
531 vc->vc_sw->con_putc(vc, softcursor_original,
532 vc->vc_y, vc->vc_x);
533 softcursor_original = -1;
534 }
535}
536
537static void hide_cursor(struct vc_data *vc)
538{
539 if (vc == sel_cons)
540 clear_selection();
541 vc->vc_sw->con_cursor(vc, CM_ERASE);
542 hide_softcursor(vc);
543}
544
545static void set_cursor(struct vc_data *vc)
546{
547 if (!IS_FG(vc) || console_blanked ||
548 vc->vc_mode == KD_GRAPHICS)
549 return;
550 if (vc->vc_deccm) {
551 if (vc == sel_cons)
552 clear_selection();
553 add_softcursor(vc);
554 if ((vc->vc_cursor_type & 0x0f) != 1)
555 vc->vc_sw->con_cursor(vc, CM_DRAW);
556 } else
557 hide_cursor(vc);
558}
559
560static void set_origin(struct vc_data *vc)
561{
562 WARN_CONSOLE_UNLOCKED();
563
564 if (!CON_IS_VISIBLE(vc) ||
565 !vc->vc_sw->con_set_origin ||
566 !vc->vc_sw->con_set_origin(vc))
567 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
568 vc->vc_visible_origin = vc->vc_origin;
569 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
570 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
571}
572
573static inline void save_screen(struct vc_data *vc)
574{
575 WARN_CONSOLE_UNLOCKED();
576
577 if (vc->vc_sw->con_save_screen)
578 vc->vc_sw->con_save_screen(vc);
579}
580
581/*
582 * Redrawing of screen
583 */
584
585static void clear_buffer_attributes(struct vc_data *vc)
586{
587 unsigned short *p = (unsigned short *)vc->vc_origin;
588 int count = vc->vc_screenbuf_size / 2;
589 int mask = vc->vc_hi_font_mask | 0xff;
590
591 for (; count > 0; count--, p++) {
592 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
593 }
594}
595
596void redraw_screen(struct vc_data *vc, int is_switch)
597{
598 int redraw = 0;
599
600 WARN_CONSOLE_UNLOCKED();
601
602 if (!vc) {
603 /* strange ... */
604 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
605 return;
606 }
607
608 if (is_switch) {
609 struct vc_data *old_vc = vc_cons[fg_console].d;
610 if (old_vc == vc)
611 return;
612 if (!CON_IS_VISIBLE(vc))
613 redraw = 1;
614 *vc->vc_display_fg = vc;
615 fg_console = vc->vc_num;
616 hide_cursor(old_vc);
617 if (!CON_IS_VISIBLE(old_vc)) {
618 save_screen(old_vc);
619 set_origin(old_vc);
620 }
621 } else {
622 hide_cursor(vc);
623 redraw = 1;
624 }
625
626 if (redraw) {
627 int update;
628 int old_was_color = vc->vc_can_do_color;
629
630 set_origin(vc);
631 update = vc->vc_sw->con_switch(vc);
632 set_palette(vc);
633 /*
634 * If console changed from mono<->color, the best we can do
635 * is to clear the buffer attributes. As it currently stands,
636 * rebuilding new attributes from the old buffer is not doable
637 * without overly complex code.
638 */
639 if (old_was_color != vc->vc_can_do_color) {
640 update_attr(vc);
641 clear_buffer_attributes(vc);
642 }
643 if (update && vc->vc_mode != KD_GRAPHICS)
644 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
645 }
646 set_cursor(vc);
647 if (is_switch) {
648 set_leds();
649 compute_shiftstate();
650 }
651}
652
653/*
654 * Allocation, freeing and resizing of VTs.
655 */
656
657int vc_cons_allocated(unsigned int i)
658{
659 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
660}
661
662static void visual_init(struct vc_data *vc, int num, int init)
663{
664 /* ++Geert: vc->vc_sw->con_init determines console size */
665 if (vc->vc_sw)
666 module_put(vc->vc_sw->owner);
667 vc->vc_sw = conswitchp;
668#ifndef VT_SINGLE_DRIVER
669 if (con_driver_map[num])
670 vc->vc_sw = con_driver_map[num];
671#endif
672 __module_get(vc->vc_sw->owner);
673 vc->vc_num = num;
674 vc->vc_display_fg = &master_display_fg;
675 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
676 vc->vc_uni_pagedir = 0;
677 vc->vc_hi_font_mask = 0;
678 vc->vc_complement_mask = 0;
679 vc->vc_can_do_color = 0;
680 vc->vc_sw->con_init(vc, init);
681 if (!vc->vc_complement_mask)
682 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
683 vc->vc_s_complement_mask = vc->vc_complement_mask;
684 vc->vc_size_row = vc->vc_cols << 1;
685 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
686}
687
688int vc_allocate(unsigned int currcons) /* return 0 on success */
689{
690 WARN_CONSOLE_UNLOCKED();
691
692 if (currcons >= MAX_NR_CONSOLES)
693 return -ENXIO;
694 if (!vc_cons[currcons].d) {
695 struct vc_data *vc;
696
697 /* prevent users from taking too much memory */
698 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
699 return -EPERM;
700
701 /* due to the granularity of kmalloc, we waste some memory here */
702 /* the alloc is done in two steps, to optimize the common situation
703 of a 25x80 console (structsize=216, screenbuf_size=4000) */
704 /* although the numbers above are not valid since long ago, the
705 point is still up-to-date and the comment still has its value
706 even if only as a historical artifact. --mj, July 1998 */
707 vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
708 if (!vc)
709 return -ENOMEM;
710 memset(vc, 0, sizeof(*vc));
711 vc_cons[currcons].d = vc;
712 visual_init(vc, currcons, 1);
713 if (!*vc->vc_uni_pagedir_loc)
714 con_set_default_unimap(vc);
715 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
716 if (!vc->vc_screenbuf) {
717 kfree(vc);
718 vc_cons[currcons].d = NULL;
719 return -ENOMEM;
720 }
721 vc->vc_kmalloced = 1;
722 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
723 }
724 return 0;
725}
726
727static inline int resize_screen(struct vc_data *vc, int width, int height)
728{
729 /* Resizes the resolution of the display adapater */
730 int err = 0;
731
732 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
733 err = vc->vc_sw->con_resize(vc, width, height);
734 return err;
735}
736
737/*
738 * Change # of rows and columns (0 means unchanged/the size of fg_console)
739 * [this is to be used together with some user program
740 * like resize that changes the hardware videomode]
741 */
742#define VC_RESIZE_MAXCOL (32767)
743#define VC_RESIZE_MAXROW (32767)
744int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
745{
746 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
747 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
748 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
749 unsigned short *newscreen;
750
751 WARN_CONSOLE_UNLOCKED();
752
753 if (!vc)
754 return -ENXIO;
755
756 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
757 return -EINVAL;
758
759 new_cols = (cols ? cols : vc->vc_cols);
760 new_rows = (lines ? lines : vc->vc_rows);
761 new_row_size = new_cols << 1;
762 new_screen_size = new_row_size * new_rows;
763
764 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
765 return 0;
766
767 newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
768 if (!newscreen)
769 return -ENOMEM;
770
771 old_rows = vc->vc_rows;
772 old_cols = vc->vc_cols;
773 old_row_size = vc->vc_size_row;
774 old_screen_size = vc->vc_screenbuf_size;
775
776 err = resize_screen(vc, new_cols, new_rows);
777 if (err) {
778 kfree(newscreen);
779 return err;
780 }
781
782 vc->vc_rows = new_rows;
783 vc->vc_cols = new_cols;
784 vc->vc_size_row = new_row_size;
785 vc->vc_screenbuf_size = new_screen_size;
786
787 rlth = min(old_row_size, new_row_size);
788 rrem = new_row_size - rlth;
789 old_origin = vc->vc_origin;
790 new_origin = (long) newscreen;
791 new_scr_end = new_origin + new_screen_size;
792 if (new_rows < old_rows)
793 old_origin += (old_rows - new_rows) * old_row_size;
794
795 update_attr(vc);
796
797 while (old_origin < vc->vc_scr_end) {
798 scr_memcpyw((unsigned short *) new_origin, (unsigned short *) old_origin, rlth);
799 if (rrem)
800 scr_memsetw((void *)(new_origin + rlth), vc->vc_video_erase_char, rrem);
801 old_origin += old_row_size;
802 new_origin += new_row_size;
803 }
804 if (new_scr_end > new_origin)
805 scr_memsetw((void *)new_origin, vc->vc_video_erase_char, new_scr_end - new_origin);
806 if (vc->vc_kmalloced)
807 kfree(vc->vc_screenbuf);
808 vc->vc_screenbuf = newscreen;
809 vc->vc_kmalloced = 1;
810 vc->vc_screenbuf_size = new_screen_size;
811 set_origin(vc);
812
813 /* do part of a reset_terminal() */
814 vc->vc_top = 0;
815 vc->vc_bottom = vc->vc_rows;
816 gotoxy(vc, vc->vc_x, vc->vc_y);
817 save_cur(vc);
818
819 if (vc->vc_tty) {
820 struct winsize ws, *cws = &vc->vc_tty->winsize;
821
822 memset(&ws, 0, sizeof(ws));
823 ws.ws_row = vc->vc_rows;
824 ws.ws_col = vc->vc_cols;
825 ws.ws_ypixel = vc->vc_scan_lines;
826 if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
827 vc->vc_tty->pgrp > 0)
828 kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
829 *cws = ws;
830 }
831
832 if (CON_IS_VISIBLE(vc))
833 update_screen(vc);
834 return err;
835}
836
837
838void vc_disallocate(unsigned int currcons)
839{
840 WARN_CONSOLE_UNLOCKED();
841
842 if (vc_cons_allocated(currcons)) {
843 struct vc_data *vc = vc_cons[currcons].d;
844 vc->vc_sw->con_deinit(vc);
845 if (vc->vc_kmalloced)
846 kfree(vc->vc_screenbuf);
847 if (currcons >= MIN_NR_CONSOLES)
848 kfree(vc);
849 vc_cons[currcons].d = NULL;
850 }
851}
852
853/*
854 * VT102 emulator
855 */
856
857#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
858#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
859#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
860
861#define decarm VC_REPEAT
862#define decckm VC_CKMODE
863#define kbdapplic VC_APPLIC
864#define lnm VC_CRLF
865
866/*
867 * this is what the terminal answers to a ESC-Z or csi0c query.
868 */
869#define VT100ID "\033[?1;2c"
870#define VT102ID "\033[?6c"
871
872unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
873 8,12,10,14, 9,13,11,15 };
874
875/* the default colour table, for VGA+ colour systems */
876int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
877 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
878int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
879 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
880int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
881 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
882
883/*
884 * gotoxy() must verify all boundaries, because the arguments
885 * might also be negative. If the given position is out of
886 * bounds, the cursor is placed at the nearest margin.
887 */
888static void gotoxy(struct vc_data *vc, int new_x, int new_y)
889{
890 int min_y, max_y;
891
892 if (new_x < 0)
893 vc->vc_x = 0;
894 else {
895 if (new_x >= vc->vc_cols)
896 vc->vc_x = vc->vc_cols - 1;
897 else
898 vc->vc_x = new_x;
899 }
900
901 if (vc->vc_decom) {
902 min_y = vc->vc_top;
903 max_y = vc->vc_bottom;
904 } else {
905 min_y = 0;
906 max_y = vc->vc_rows;
907 }
908 if (new_y < min_y)
909 vc->vc_y = min_y;
910 else if (new_y >= max_y)
911 vc->vc_y = max_y - 1;
912 else
913 vc->vc_y = new_y;
914 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
915 vc->vc_need_wrap = 0;
916}
917
918/* for absolute user moves, when decom is set */
919static void gotoxay(struct vc_data *vc, int new_x, int new_y)
920{
921 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
922}
923
924void scrollback(struct vc_data *vc, int lines)
925{
926 if (!lines)
927 lines = vc->vc_rows / 2;
928 scrolldelta(-lines);
929}
930
931void scrollfront(struct vc_data *vc, int lines)
932{
933 if (!lines)
934 lines = vc->vc_rows / 2;
935 scrolldelta(lines);
936}
937
938static void lf(struct vc_data *vc)
939{
940 /* don't scroll if above bottom of scrolling region, or
941 * if below scrolling region
942 */
943 if (vc->vc_y + 1 == vc->vc_bottom)
944 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
945 else if (vc->vc_y < vc->vc_rows - 1) {
946 vc->vc_y++;
947 vc->vc_pos += vc->vc_size_row;
948 }
949 vc->vc_need_wrap = 0;
950}
951
952static void ri(struct vc_data *vc)
953{
954 /* don't scroll if below top of scrolling region, or
955 * if above scrolling region
956 */
957 if (vc->vc_y == vc->vc_top)
958 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
959 else if (vc->vc_y > 0) {
960 vc->vc_y--;
961 vc->vc_pos -= vc->vc_size_row;
962 }
963 vc->vc_need_wrap = 0;
964}
965
966static inline void cr(struct vc_data *vc)
967{
968 vc->vc_pos -= vc->vc_x << 1;
969 vc->vc_need_wrap = vc->vc_x = 0;
970}
971
972static inline void bs(struct vc_data *vc)
973{
974 if (vc->vc_x) {
975 vc->vc_pos -= 2;
976 vc->vc_x--;
977 vc->vc_need_wrap = 0;
978 }
979}
980
981static inline void del(struct vc_data *vc)
982{
983 /* ignored */
984}
985
986static void csi_J(struct vc_data *vc, int vpar)
987{
988 unsigned int count;
989 unsigned short * start;
990
991 switch (vpar) {
992 case 0: /* erase from cursor to end of display */
993 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
994 start = (unsigned short *)vc->vc_pos;
995 if (DO_UPDATE(vc)) {
996 /* do in two stages */
997 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
998 vc->vc_cols - vc->vc_x);
999 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1000 vc->vc_rows - vc->vc_y - 1,
1001 vc->vc_cols);
1002 }
1003 break;
1004 case 1: /* erase from start to cursor */
1005 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1006 start = (unsigned short *)vc->vc_origin;
1007 if (DO_UPDATE(vc)) {
1008 /* do in two stages */
1009 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1010 vc->vc_cols);
1011 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1012 vc->vc_x + 1);
1013 }
1014 break;
1015 case 2: /* erase whole display */
1016 count = vc->vc_cols * vc->vc_rows;
1017 start = (unsigned short *)vc->vc_origin;
1018 if (DO_UPDATE(vc))
1019 vc->vc_sw->con_clear(vc, 0, 0,
1020 vc->vc_rows,
1021 vc->vc_cols);
1022 break;
1023 default:
1024 return;
1025 }
1026 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1027 vc->vc_need_wrap = 0;
1028}
1029
1030static void csi_K(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 line */
1037 count = vc->vc_cols - vc->vc_x;
1038 start = (unsigned short *)vc->vc_pos;
1039 if (DO_UPDATE(vc))
1040 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1041 vc->vc_cols - vc->vc_x);
1042 break;
1043 case 1: /* erase from start of line to cursor */
1044 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1045 count = vc->vc_x + 1;
1046 if (DO_UPDATE(vc))
1047 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1048 vc->vc_x + 1);
1049 break;
1050 case 2: /* erase whole line */
1051 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1052 count = vc->vc_cols;
1053 if (DO_UPDATE(vc))
1054 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1055 vc->vc_cols);
1056 break;
1057 default:
1058 return;
1059 }
1060 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1061 vc->vc_need_wrap = 0;
1062}
1063
1064static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1065{ /* not vt100? */
1066 int count;
1067
1068 if (!vpar)
1069 vpar++;
1070 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1071
1072 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1073 if (DO_UPDATE(vc))
1074 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1075 vc->vc_need_wrap = 0;
1076}
1077
1078static void default_attr(struct vc_data *vc)
1079{
1080 vc->vc_intensity = 1;
1081 vc->vc_underline = 0;
1082 vc->vc_reverse = 0;
1083 vc->vc_blink = 0;
1084 vc->vc_color = vc->vc_def_color;
1085}
1086
1087/* console_sem is held */
1088static void csi_m(struct vc_data *vc)
1089{
1090 int i;
1091
1092 for (i = 0; i <= vc->vc_npar; i++)
1093 switch (vc->vc_par[i]) {
1094 case 0: /* all attributes off */
1095 default_attr(vc);
1096 break;
1097 case 1:
1098 vc->vc_intensity = 2;
1099 break;
1100 case 2:
1101 vc->vc_intensity = 0;
1102 break;
1103 case 4:
1104 vc->vc_underline = 1;
1105 break;
1106 case 5:
1107 vc->vc_blink = 1;
1108 break;
1109 case 7:
1110 vc->vc_reverse = 1;
1111 break;
1112 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1113 * Select primary font, don't display
1114 * control chars if defined, don't set
1115 * bit 8 on output.
1116 */
1117 vc->vc_translate = set_translate(vc->vc_charset == 0
1118 ? vc->vc_G0_charset
1119 : vc->vc_G1_charset, vc);
1120 vc->vc_disp_ctrl = 0;
1121 vc->vc_toggle_meta = 0;
1122 break;
1123 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1124 * Select first alternate font, lets
1125 * chars < 32 be displayed as ROM chars.
1126 */
1127 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1128 vc->vc_disp_ctrl = 1;
1129 vc->vc_toggle_meta = 0;
1130 break;
1131 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1132 * Select second alternate font, toggle
1133 * high bit before displaying as ROM char.
1134 */
1135 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1136 vc->vc_disp_ctrl = 1;
1137 vc->vc_toggle_meta = 1;
1138 break;
1139 case 21:
1140 case 22:
1141 vc->vc_intensity = 1;
1142 break;
1143 case 24:
1144 vc->vc_underline = 0;
1145 break;
1146 case 25:
1147 vc->vc_blink = 0;
1148 break;
1149 case 27:
1150 vc->vc_reverse = 0;
1151 break;
1152 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1153 * Enables underscore, white foreground
1154 * with white underscore (Linux - use
1155 * default foreground).
1156 */
1157 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1158 vc->vc_underline = 1;
1159 break;
1160 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1161 * Disable underline option.
1162 * Reset colour to default? It did this
1163 * before...
1164 */
1165 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1166 vc->vc_underline = 0;
1167 break;
1168 case 49:
1169 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1170 break;
1171 default:
1172 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1173 vc->vc_color = color_table[vc->vc_par[i] - 30]
1174 | (vc->vc_color & 0xf0);
1175 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1176 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1177 | (vc->vc_color & 0x0f);
1178 break;
1179 }
1180 update_attr(vc);
1181}
1182
1183static void respond_string(const char *p, struct tty_struct *tty)
1184{
1185 while (*p) {
1186 tty_insert_flip_char(tty, *p, 0);
1187 p++;
1188 }
1189 con_schedule_flip(tty);
1190}
1191
1192static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1193{
1194 char buf[40];
1195
1196 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1197 respond_string(buf, tty);
1198}
1199
1200static inline void status_report(struct tty_struct *tty)
1201{
1202 respond_string("\033[0n", tty); /* Terminal ok */
1203}
1204
1205static inline void respond_ID(struct tty_struct * tty)
1206{
1207 respond_string(VT102ID, tty);
1208}
1209
1210void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1211{
1212 char buf[8];
1213
1214 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1215 (char)('!' + mry));
1216 respond_string(buf, tty);
1217}
1218
1219/* invoked via ioctl(TIOCLINUX) and through set_selection */
1220int mouse_reporting(void)
1221{
1222 return vc_cons[fg_console].d->vc_report_mouse;
1223}
1224
1225/* console_sem is held */
1226static void set_mode(struct vc_data *vc, int on_off)
1227{
1228 int i;
1229
1230 for (i = 0; i <= vc->vc_npar; i++)
1231 if (vc->vc_ques) {
1232 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1233 case 1: /* Cursor keys send ^[Ox/^[[x */
1234 if (on_off)
1235 set_kbd(vc, decckm);
1236 else
1237 clr_kbd(vc, decckm);
1238 break;
1239 case 3: /* 80/132 mode switch unimplemented */
1240 vc->vc_deccolm = on_off;
1241#if 0
1242 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1243 /* this alone does not suffice; some user mode
1244 utility has to change the hardware regs */
1245#endif
1246 break;
1247 case 5: /* Inverted screen on/off */
1248 if (vc->vc_decscnm != on_off) {
1249 vc->vc_decscnm = on_off;
1250 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1251 update_attr(vc);
1252 }
1253 break;
1254 case 6: /* Origin relative/absolute */
1255 vc->vc_decom = on_off;
1256 gotoxay(vc, 0, 0);
1257 break;
1258 case 7: /* Autowrap on/off */
1259 vc->vc_decawm = on_off;
1260 break;
1261 case 8: /* Autorepeat on/off */
1262 if (on_off)
1263 set_kbd(vc, decarm);
1264 else
1265 clr_kbd(vc, decarm);
1266 break;
1267 case 9:
1268 vc->vc_report_mouse = on_off ? 1 : 0;
1269 break;
1270 case 25: /* Cursor on/off */
1271 vc->vc_deccm = on_off;
1272 break;
1273 case 1000:
1274 vc->vc_report_mouse = on_off ? 2 : 0;
1275 break;
1276 }
1277 } else {
1278 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1279 case 3: /* Monitor (display ctrls) */
1280 vc->vc_disp_ctrl = on_off;
1281 break;
1282 case 4: /* Insert Mode on/off */
1283 vc->vc_decim = on_off;
1284 break;
1285 case 20: /* Lf, Enter == CrLf/Lf */
1286 if (on_off)
1287 set_kbd(vc, lnm);
1288 else
1289 clr_kbd(vc, lnm);
1290 break;
1291 }
1292 }
1293}
1294
1295/* console_sem is held */
1296static void setterm_command(struct vc_data *vc)
1297{
1298 switch(vc->vc_par[0]) {
1299 case 1: /* set color for underline mode */
1300 if (vc->vc_can_do_color &&
1301 vc->vc_par[1] < 16) {
1302 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1303 if (vc->vc_underline)
1304 update_attr(vc);
1305 }
1306 break;
1307 case 2: /* set color for half intensity mode */
1308 if (vc->vc_can_do_color &&
1309 vc->vc_par[1] < 16) {
1310 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1311 if (vc->vc_intensity == 0)
1312 update_attr(vc);
1313 }
1314 break;
1315 case 8: /* store colors as defaults */
1316 vc->vc_def_color = vc->vc_attr;
1317 if (vc->vc_hi_font_mask == 0x100)
1318 vc->vc_def_color >>= 1;
1319 default_attr(vc);
1320 update_attr(vc);
1321 break;
1322 case 9: /* set blanking interval */
1323 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1324 poke_blanked_console();
1325 break;
1326 case 10: /* set bell frequency in Hz */
1327 if (vc->vc_npar >= 1)
1328 vc->vc_bell_pitch = vc->vc_par[1];
1329 else
1330 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1331 break;
1332 case 11: /* set bell duration in msec */
1333 if (vc->vc_npar >= 1)
1334 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1335 vc->vc_par[1] * HZ / 1000 : 0;
1336 else
1337 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1338 break;
1339 case 12: /* bring specified console to the front */
1340 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1341 set_console(vc->vc_par[1] - 1);
1342 break;
1343 case 13: /* unblank the screen */
1344 poke_blanked_console();
1345 break;
1346 case 14: /* set vesa powerdown interval */
1347 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1348 break;
1349 case 15: /* activate the previous console */
1350 set_console(last_console);
1351 break;
1352 }
1353}
1354
1355/* console_sem is held */
1356static void csi_at(struct vc_data *vc, unsigned int nr)
1357{
1358 if (nr > vc->vc_cols - vc->vc_x)
1359 nr = vc->vc_cols - vc->vc_x;
1360 else if (!nr)
1361 nr = 1;
1362 insert_char(vc, nr);
1363}
1364
1365/* console_sem is held */
1366static void csi_L(struct vc_data *vc, unsigned int nr)
1367{
1368 if (nr > vc->vc_rows - vc->vc_y)
1369 nr = vc->vc_rows - vc->vc_y;
1370 else if (!nr)
1371 nr = 1;
1372 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1373 vc->vc_need_wrap = 0;
1374}
1375
1376/* console_sem is held */
1377static void csi_P(struct vc_data *vc, unsigned int nr)
1378{
1379 if (nr > vc->vc_cols - vc->vc_x)
1380 nr = vc->vc_cols - vc->vc_x;
1381 else if (!nr)
1382 nr = 1;
1383 delete_char(vc, nr);
1384}
1385
1386/* console_sem is held */
1387static void csi_M(struct vc_data *vc, unsigned int nr)
1388{
1389 if (nr > vc->vc_rows - vc->vc_y)
1390 nr = vc->vc_rows - vc->vc_y;
1391 else if (!nr)
1392 nr=1;
1393 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1394 vc->vc_need_wrap = 0;
1395}
1396
1397/* console_sem is held (except via vc_init->reset_terminal */
1398static void save_cur(struct vc_data *vc)
1399{
1400 vc->vc_saved_x = vc->vc_x;
1401 vc->vc_saved_y = vc->vc_y;
1402 vc->vc_s_intensity = vc->vc_intensity;
1403 vc->vc_s_underline = vc->vc_underline;
1404 vc->vc_s_blink = vc->vc_blink;
1405 vc->vc_s_reverse = vc->vc_reverse;
1406 vc->vc_s_charset = vc->vc_charset;
1407 vc->vc_s_color = vc->vc_color;
1408 vc->vc_saved_G0 = vc->vc_G0_charset;
1409 vc->vc_saved_G1 = vc->vc_G1_charset;
1410}
1411
1412/* console_sem is held */
1413static void restore_cur(struct vc_data *vc)
1414{
1415 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1416 vc->vc_intensity = vc->vc_s_intensity;
1417 vc->vc_underline = vc->vc_s_underline;
1418 vc->vc_blink = vc->vc_s_blink;
1419 vc->vc_reverse = vc->vc_s_reverse;
1420 vc->vc_charset = vc->vc_s_charset;
1421 vc->vc_color = vc->vc_s_color;
1422 vc->vc_G0_charset = vc->vc_saved_G0;
1423 vc->vc_G1_charset = vc->vc_saved_G1;
1424 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1425 update_attr(vc);
1426 vc->vc_need_wrap = 0;
1427}
1428
1429enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1430 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1431 ESpalette };
1432
1433/* console_sem is held (except via vc_init()) */
1434static void reset_terminal(struct vc_data *vc, int do_clear)
1435{
1436 vc->vc_top = 0;
1437 vc->vc_bottom = vc->vc_rows;
1438 vc->vc_state = ESnormal;
1439 vc->vc_ques = 0;
1440 vc->vc_translate = set_translate(LAT1_MAP, vc);
1441 vc->vc_G0_charset = LAT1_MAP;
1442 vc->vc_G1_charset = GRAF_MAP;
1443 vc->vc_charset = 0;
1444 vc->vc_need_wrap = 0;
1445 vc->vc_report_mouse = 0;
1446 vc->vc_utf = 0;
1447 vc->vc_utf_count = 0;
1448
1449 vc->vc_disp_ctrl = 0;
1450 vc->vc_toggle_meta = 0;
1451
1452 vc->vc_decscnm = 0;
1453 vc->vc_decom = 0;
1454 vc->vc_decawm = 1;
1455 vc->vc_deccm = 1;
1456 vc->vc_decim = 0;
1457
1458 set_kbd(vc, decarm);
1459 clr_kbd(vc, decckm);
1460 clr_kbd(vc, kbdapplic);
1461 clr_kbd(vc, lnm);
1462 kbd_table[vc->vc_num].lockstate = 0;
1463 kbd_table[vc->vc_num].slockstate = 0;
1464 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1465 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1466 /* do not do set_leds here because this causes an endless tasklet loop
1467 when the keyboard hasn't been initialized yet */
1468
1469 vc->vc_cursor_type = CUR_DEFAULT;
1470 vc->vc_complement_mask = vc->vc_s_complement_mask;
1471
1472 default_attr(vc);
1473 update_attr(vc);
1474
1475 vc->vc_tab_stop[0] = 0x01010100;
1476 vc->vc_tab_stop[1] =
1477 vc->vc_tab_stop[2] =
1478 vc->vc_tab_stop[3] =
1479 vc->vc_tab_stop[4] = 0x01010101;
1480
1481 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1482 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1483
1484 gotoxy(vc, 0, 0);
1485 save_cur(vc);
1486 if (do_clear)
1487 csi_J(vc, 2);
1488}
1489
1490/* console_sem is held */
1491static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1492{
1493 /*
1494 * Control characters can be used in the _middle_
1495 * of an escape sequence.
1496 */
1497 switch (c) {
1498 case 0:
1499 return;
1500 case 7:
1501 if (vc->vc_bell_duration)
1502 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1503 return;
1504 case 8:
1505 bs(vc);
1506 return;
1507 case 9:
1508 vc->vc_pos -= (vc->vc_x << 1);
1509 while (vc->vc_x < vc->vc_cols - 1) {
1510 vc->vc_x++;
1511 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1512 break;
1513 }
1514 vc->vc_pos += (vc->vc_x << 1);
1515 return;
1516 case 10: case 11: case 12:
1517 lf(vc);
1518 if (!is_kbd(vc, lnm))
1519 return;
1520 case 13:
1521 cr(vc);
1522 return;
1523 case 14:
1524 vc->vc_charset = 1;
1525 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1526 vc->vc_disp_ctrl = 1;
1527 return;
1528 case 15:
1529 vc->vc_charset = 0;
1530 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1531 vc->vc_disp_ctrl = 0;
1532 return;
1533 case 24: case 26:
1534 vc->vc_state = ESnormal;
1535 return;
1536 case 27:
1537 vc->vc_state = ESesc;
1538 return;
1539 case 127:
1540 del(vc);
1541 return;
1542 case 128+27:
1543 vc->vc_state = ESsquare;
1544 return;
1545 }
1546 switch(vc->vc_state) {
1547 case ESesc:
1548 vc->vc_state = ESnormal;
1549 switch (c) {
1550 case '[':
1551 vc->vc_state = ESsquare;
1552 return;
1553 case ']':
1554 vc->vc_state = ESnonstd;
1555 return;
1556 case '%':
1557 vc->vc_state = ESpercent;
1558 return;
1559 case 'E':
1560 cr(vc);
1561 lf(vc);
1562 return;
1563 case 'M':
1564 ri(vc);
1565 return;
1566 case 'D':
1567 lf(vc);
1568 return;
1569 case 'H':
1570 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1571 return;
1572 case 'Z':
1573 respond_ID(tty);
1574 return;
1575 case '7':
1576 save_cur(vc);
1577 return;
1578 case '8':
1579 restore_cur(vc);
1580 return;
1581 case '(':
1582 vc->vc_state = ESsetG0;
1583 return;
1584 case ')':
1585 vc->vc_state = ESsetG1;
1586 return;
1587 case '#':
1588 vc->vc_state = EShash;
1589 return;
1590 case 'c':
1591 reset_terminal(vc, 1);
1592 return;
1593 case '>': /* Numeric keypad */
1594 clr_kbd(vc, kbdapplic);
1595 return;
1596 case '=': /* Appl. keypad */
1597 set_kbd(vc, kbdapplic);
1598 return;
1599 }
1600 return;
1601 case ESnonstd:
1602 if (c=='P') { /* palette escape sequence */
1603 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1604 vc->vc_par[vc->vc_npar] = 0;
1605 vc->vc_npar = 0;
1606 vc->vc_state = ESpalette;
1607 return;
1608 } else if (c=='R') { /* reset palette */
1609 reset_palette(vc);
1610 vc->vc_state = ESnormal;
1611 } else
1612 vc->vc_state = ESnormal;
1613 return;
1614 case ESpalette:
1615 if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
1616 vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
1617 if (vc->vc_npar == 7) {
1618 int i = vc->vc_par[0] * 3, j = 1;
1619 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1620 vc->vc_palette[i++] += vc->vc_par[j++];
1621 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1622 vc->vc_palette[i++] += vc->vc_par[j++];
1623 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1624 vc->vc_palette[i] += vc->vc_par[j];
1625 set_palette(vc);
1626 vc->vc_state = ESnormal;
1627 }
1628 } else
1629 vc->vc_state = ESnormal;
1630 return;
1631 case ESsquare:
1632 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1633 vc->vc_par[vc->vc_npar] = 0;
1634 vc->vc_npar = 0;
1635 vc->vc_state = ESgetpars;
1636 if (c == '[') { /* Function key */
1637 vc->vc_state=ESfunckey;
1638 return;
1639 }
1640 vc->vc_ques = (c == '?');
1641 if (vc->vc_ques)
1642 return;
1643 case ESgetpars:
1644 if (c == ';' && vc->vc_npar < NPAR - 1) {
1645 vc->vc_npar++;
1646 return;
1647 } else if (c>='0' && c<='9') {
1648 vc->vc_par[vc->vc_npar] *= 10;
1649 vc->vc_par[vc->vc_npar] += c - '0';
1650 return;
1651 } else
1652 vc->vc_state = ESgotpars;
1653 case ESgotpars:
1654 vc->vc_state = ESnormal;
1655 switch(c) {
1656 case 'h':
1657 set_mode(vc, 1);
1658 return;
1659 case 'l':
1660 set_mode(vc, 0);
1661 return;
1662 case 'c':
1663 if (vc->vc_ques) {
1664 if (vc->vc_par[0])
1665 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1666 else
1667 vc->vc_cursor_type = CUR_DEFAULT;
1668 return;
1669 }
1670 break;
1671 case 'm':
1672 if (vc->vc_ques) {
1673 clear_selection();
1674 if (vc->vc_par[0])
1675 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1676 else
1677 vc->vc_complement_mask = vc->vc_s_complement_mask;
1678 return;
1679 }
1680 break;
1681 case 'n':
1682 if (!vc->vc_ques) {
1683 if (vc->vc_par[0] == 5)
1684 status_report(tty);
1685 else if (vc->vc_par[0] == 6)
1686 cursor_report(vc, tty);
1687 }
1688 return;
1689 }
1690 if (vc->vc_ques) {
1691 vc->vc_ques = 0;
1692 return;
1693 }
1694 switch(c) {
1695 case 'G': case '`':
1696 if (vc->vc_par[0])
1697 vc->vc_par[0]--;
1698 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1699 return;
1700 case 'A':
1701 if (!vc->vc_par[0])
1702 vc->vc_par[0]++;
1703 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1704 return;
1705 case 'B': case 'e':
1706 if (!vc->vc_par[0])
1707 vc->vc_par[0]++;
1708 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1709 return;
1710 case 'C': case 'a':
1711 if (!vc->vc_par[0])
1712 vc->vc_par[0]++;
1713 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1714 return;
1715 case 'D':
1716 if (!vc->vc_par[0])
1717 vc->vc_par[0]++;
1718 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1719 return;
1720 case 'E':
1721 if (!vc->vc_par[0])
1722 vc->vc_par[0]++;
1723 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1724 return;
1725 case 'F':
1726 if (!vc->vc_par[0])
1727 vc->vc_par[0]++;
1728 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1729 return;
1730 case 'd':
1731 if (vc->vc_par[0])
1732 vc->vc_par[0]--;
1733 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1734 return;
1735 case 'H': case 'f':
1736 if (vc->vc_par[0])
1737 vc->vc_par[0]--;
1738 if (vc->vc_par[1])
1739 vc->vc_par[1]--;
1740 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1741 return;
1742 case 'J':
1743 csi_J(vc, vc->vc_par[0]);
1744 return;
1745 case 'K':
1746 csi_K(vc, vc->vc_par[0]);
1747 return;
1748 case 'L':
1749 csi_L(vc, vc->vc_par[0]);
1750 return;
1751 case 'M':
1752 csi_M(vc, vc->vc_par[0]);
1753 return;
1754 case 'P':
1755 csi_P(vc, vc->vc_par[0]);
1756 return;
1757 case 'c':
1758 if (!vc->vc_par[0])
1759 respond_ID(tty);
1760 return;
1761 case 'g':
1762 if (!vc->vc_par[0])
1763 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1764 else if (vc->vc_par[0] == 3) {
1765 vc->vc_tab_stop[0] =
1766 vc->vc_tab_stop[1] =
1767 vc->vc_tab_stop[2] =
1768 vc->vc_tab_stop[3] =
1769 vc->vc_tab_stop[4] = 0;
1770 }
1771 return;
1772 case 'm':
1773 csi_m(vc);
1774 return;
1775 case 'q': /* DECLL - but only 3 leds */
1776 /* map 0,1,2,3 to 0,1,2,4 */
1777 if (vc->vc_par[0] < 4)
1778 setledstate(kbd_table + vc->vc_num,
1779 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1780 return;
1781 case 'r':
1782 if (!vc->vc_par[0])
1783 vc->vc_par[0]++;
1784 if (!vc->vc_par[1])
1785 vc->vc_par[1] = vc->vc_rows;
1786 /* Minimum allowed region is 2 lines */
1787 if (vc->vc_par[0] < vc->vc_par[1] &&
1788 vc->vc_par[1] <= vc->vc_rows) {
1789 vc->vc_top = vc->vc_par[0] - 1;
1790 vc->vc_bottom = vc->vc_par[1];
1791 gotoxay(vc, 0, 0);
1792 }
1793 return;
1794 case 's':
1795 save_cur(vc);
1796 return;
1797 case 'u':
1798 restore_cur(vc);
1799 return;
1800 case 'X':
1801 csi_X(vc, vc->vc_par[0]);
1802 return;
1803 case '@':
1804 csi_at(vc, vc->vc_par[0]);
1805 return;
1806 case ']': /* setterm functions */
1807 setterm_command(vc);
1808 return;
1809 }
1810 return;
1811 case ESpercent:
1812 vc->vc_state = ESnormal;
1813 switch (c) {
1814 case '@': /* defined in ISO 2022 */
1815 vc->vc_utf = 0;
1816 return;
1817 case 'G': /* prelim official escape code */
1818 case '8': /* retained for compatibility */
1819 vc->vc_utf = 1;
1820 return;
1821 }
1822 return;
1823 case ESfunckey:
1824 vc->vc_state = ESnormal;
1825 return;
1826 case EShash:
1827 vc->vc_state = ESnormal;
1828 if (c == '8') {
1829 /* DEC screen alignment test. kludge :-) */
1830 vc->vc_video_erase_char =
1831 (vc->vc_video_erase_char & 0xff00) | 'E';
1832 csi_J(vc, 2);
1833 vc->vc_video_erase_char =
1834 (vc->vc_video_erase_char & 0xff00) | ' ';
1835 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1836 }
1837 return;
1838 case ESsetG0:
1839 if (c == '0')
1840 vc->vc_G0_charset = GRAF_MAP;
1841 else if (c == 'B')
1842 vc->vc_G0_charset = LAT1_MAP;
1843 else if (c == 'U')
1844 vc->vc_G0_charset = IBMPC_MAP;
1845 else if (c == 'K')
1846 vc->vc_G0_charset = USER_MAP;
1847 if (vc->vc_charset == 0)
1848 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1849 vc->vc_state = ESnormal;
1850 return;
1851 case ESsetG1:
1852 if (c == '0')
1853 vc->vc_G1_charset = GRAF_MAP;
1854 else if (c == 'B')
1855 vc->vc_G1_charset = LAT1_MAP;
1856 else if (c == 'U')
1857 vc->vc_G1_charset = IBMPC_MAP;
1858 else if (c == 'K')
1859 vc->vc_G1_charset = USER_MAP;
1860 if (vc->vc_charset == 1)
1861 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1862 vc->vc_state = ESnormal;
1863 return;
1864 default:
1865 vc->vc_state = ESnormal;
1866 }
1867}
1868
1869/* This is a temporary buffer used to prepare a tty console write
1870 * so that we can easily avoid touching user space while holding the
1871 * console spinlock. It is allocated in con_init and is shared by
1872 * this code and the vc_screen read/write tty calls.
1873 *
1874 * We have to allocate this statically in the kernel data section
1875 * since console_init (and thus con_init) are called before any
1876 * kernel memory allocation is available.
1877 */
1878char con_buf[CON_BUF_SIZE];
1879DECLARE_MUTEX(con_buf_sem);
1880
1881/* acquires console_sem */
1882static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
1883{
1884#ifdef VT_BUF_VRAM_ONLY
1885#define FLUSH do { } while(0);
1886#else
1887#define FLUSH if (draw_x >= 0) { \
1888 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
1889 draw_x = -1; \
1890 }
1891#endif
1892
1893 int c, tc, ok, n = 0, draw_x = -1;
1894 unsigned int currcons;
1895 unsigned long draw_from = 0, draw_to = 0;
1896 struct vc_data *vc;
1897 u16 himask, charmask;
1898 const unsigned char *orig_buf = NULL;
1899 int orig_count;
1900
1901 if (in_interrupt())
1902 return count;
1903
1904 might_sleep();
1905
1906 acquire_console_sem();
1907 vc = tty->driver_data;
1908 if (vc == NULL) {
1909 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
1910 release_console_sem();
1911 return 0;
1912 }
1913
1914 currcons = vc->vc_num;
1915 if (!vc_cons_allocated(currcons)) {
1916 /* could this happen? */
1917 static int error = 0;
1918 if (!error) {
1919 error = 1;
1920 printk("con_write: tty %d not allocated\n", currcons+1);
1921 }
1922 release_console_sem();
1923 return 0;
1924 }
1925 release_console_sem();
1926
1927 orig_buf = buf;
1928 orig_count = count;
1929
1930 /* At this point 'buf' is guaranteed to be a kernel buffer
1931 * and therefore no access to userspace (and therefore sleeping)
1932 * will be needed. The con_buf_sem serializes all tty based
1933 * console rendering and vcs write/read operations. We hold
1934 * the console spinlock during the entire write.
1935 */
1936
1937 acquire_console_sem();
1938
1939 vc = tty->driver_data;
1940 if (vc == NULL) {
1941 printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
1942 release_console_sem();
1943 goto out;
1944 }
1945
1946 himask = vc->vc_hi_font_mask;
1947 charmask = himask ? 0x1ff : 0xff;
1948
1949 /* undraw cursor first */
1950 if (IS_FG(vc))
1951 hide_cursor(vc);
1952
1953 while (!tty->stopped && count) {
1954 int orig = *buf;
1955 c = orig;
1956 buf++;
1957 n++;
1958 count--;
1959
1960 /* Do no translation at all in control states */
1961 if (vc->vc_state != ESnormal) {
1962 tc = c;
1963 } else if (vc->vc_utf) {
1964 /* Combine UTF-8 into Unicode */
1965 /* Incomplete characters silently ignored */
1966 if(c > 0x7f) {
1967 if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
1968 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
1969 vc->vc_utf_count--;
1970 if (vc->vc_utf_count == 0)
1971 tc = c = vc->vc_utf_char;
1972 else continue;
1973 } else {
1974 if ((c & 0xe0) == 0xc0) {
1975 vc->vc_utf_count = 1;
1976 vc->vc_utf_char = (c & 0x1f);
1977 } else if ((c & 0xf0) == 0xe0) {
1978 vc->vc_utf_count = 2;
1979 vc->vc_utf_char = (c & 0x0f);
1980 } else if ((c & 0xf8) == 0xf0) {
1981 vc->vc_utf_count = 3;
1982 vc->vc_utf_char = (c & 0x07);
1983 } else if ((c & 0xfc) == 0xf8) {
1984 vc->vc_utf_count = 4;
1985 vc->vc_utf_char = (c & 0x03);
1986 } else if ((c & 0xfe) == 0xfc) {
1987 vc->vc_utf_count = 5;
1988 vc->vc_utf_char = (c & 0x01);
1989 } else
1990 vc->vc_utf_count = 0;
1991 continue;
1992 }
1993 } else {
1994 tc = c;
1995 vc->vc_utf_count = 0;
1996 }
1997 } else { /* no utf */
1998 tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
1999 }
2000
2001 /* If the original code was a control character we
2002 * only allow a glyph to be displayed if the code is
2003 * not normally used (such as for cursor movement) or
2004 * if the disp_ctrl mode has been explicitly enabled.
2005 * Certain characters (as given by the CTRL_ALWAYS
2006 * bitmap) are always displayed as control characters,
2007 * as the console would be pretty useless without
2008 * them; to display an arbitrary font position use the
2009 * direct-to-font zone in UTF-8 mode.
2010 */
2011 ok = tc && (c >= 32 ||
2012 (!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
2013 : CTRL_ACTION) >> c) & 1)))
2014 && (c != 127 || vc->vc_disp_ctrl)
2015 && (c != 128+27);
2016
2017 if (vc->vc_state == ESnormal && ok) {
2018 /* Now try to find out how to display it */
2019 tc = conv_uni_to_pc(vc, tc);
2020 if ( tc == -4 ) {
2021 /* If we got -4 (not found) then see if we have
2022 defined a replacement character (U+FFFD) */
2023 tc = conv_uni_to_pc(vc, 0xfffd);
2024
2025 /* One reason for the -4 can be that we just
2026 did a clear_unimap();
2027 try at least to show something. */
2028 if (tc == -4)
2029 tc = c;
2030 } else if ( tc == -3 ) {
2031 /* Bad hash table -- hope for the best */
2032 tc = c;
2033 }
2034 if (tc & ~charmask)
2035 continue; /* Conversion failed */
2036
2037 if (vc->vc_need_wrap || vc->vc_decim)
2038 FLUSH
2039 if (vc->vc_need_wrap) {
2040 cr(vc);
2041 lf(vc);
2042 }
2043 if (vc->vc_decim)
2044 insert_char(vc, 1);
2045 scr_writew(himask ?
2046 ((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2047 (vc->vc_attr << 8) + tc,
2048 (u16 *) vc->vc_pos);
2049 if (DO_UPDATE(vc) && draw_x < 0) {
2050 draw_x = vc->vc_x;
2051 draw_from = vc->vc_pos;
2052 }
2053 if (vc->vc_x == vc->vc_cols - 1) {
2054 vc->vc_need_wrap = vc->vc_decawm;
2055 draw_to = vc->vc_pos + 2;
2056 } else {
2057 vc->vc_x++;
2058 draw_to = (vc->vc_pos += 2);
2059 }
2060 continue;
2061 }
2062 FLUSH
2063 do_con_trol(tty, vc, orig);
2064 }
2065 FLUSH
2066 console_conditional_schedule();
2067 release_console_sem();
2068
2069out:
2070 return n;
2071#undef FLUSH
2072}
2073
2074/*
2075 * This is the console switching callback.
2076 *
2077 * Doing console switching in a process context allows
2078 * us to do the switches asynchronously (needed when we want
2079 * to switch due to a keyboard interrupt). Synchronization
2080 * with other console code and prevention of re-entrancy is
2081 * ensured with console_sem.
2082 */
2083static void console_callback(void *ignored)
2084{
2085 acquire_console_sem();
2086
2087 if (want_console >= 0) {
2088 if (want_console != fg_console &&
2089 vc_cons_allocated(want_console)) {
2090 hide_cursor(vc_cons[fg_console].d);
2091 change_console(vc_cons[want_console].d);
2092 /* we only changed when the console had already
2093 been allocated - a new console is not created
2094 in an interrupt routine */
2095 }
2096 want_console = -1;
2097 }
2098 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2099 do_poke_blanked_console = 0;
2100 poke_blanked_console();
2101 }
2102 if (scrollback_delta) {
2103 struct vc_data *vc = vc_cons[fg_console].d;
2104 clear_selection();
2105 if (vc->vc_mode == KD_TEXT)
2106 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2107 scrollback_delta = 0;
2108 }
2109 if (blank_timer_expired) {
2110 do_blank_screen(0);
2111 blank_timer_expired = 0;
2112 }
2113
2114 release_console_sem();
2115}
2116
2117void set_console(int nr)
2118{
2119 want_console = nr;
2120 schedule_console_callback();
2121}
2122
2123struct tty_driver *console_driver;
2124
2125#ifdef CONFIG_VT_CONSOLE
2126
2127/*
2128 * Console on virtual terminal
2129 *
2130 * The console must be locked when we get here.
2131 */
2132
2133static void vt_console_print(struct console *co, const char *b, unsigned count)
2134{
2135 struct vc_data *vc = vc_cons[fg_console].d;
2136 unsigned char c;
2137 static unsigned long printing;
2138 const ushort *start;
2139 ushort cnt = 0;
2140 ushort myx;
2141
2142 /* console busy or not yet initialized */
2143 if (!printable || test_and_set_bit(0, &printing))
2144 return;
2145
2146 if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
2147 vc = vc_cons[kmsg_redirect - 1].d;
2148
2149 /* read `x' only after setting currcons properly (otherwise
2150 the `x' macro will read the x of the foreground console). */
2151 myx = vc->vc_x;
2152
2153 if (!vc_cons_allocated(fg_console)) {
2154 /* impossible */
2155 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2156 goto quit;
2157 }
2158
2159 if (vc->vc_mode != KD_TEXT)
2160 goto quit;
2161
2162 /* undraw cursor first */
2163 if (IS_FG(vc))
2164 hide_cursor(vc);
2165
2166 start = (ushort *)vc->vc_pos;
2167
2168 /* Contrived structure to try to emulate original need_wrap behaviour
2169 * Problems caused when we have need_wrap set on '\n' character */
2170 while (count--) {
2171 c = *b++;
2172 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2173 if (cnt > 0) {
2174 if (CON_IS_VISIBLE(vc))
2175 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2176 vc->vc_x += cnt;
2177 if (vc->vc_need_wrap)
2178 vc->vc_x--;
2179 cnt = 0;
2180 }
2181 if (c == 8) { /* backspace */
2182 bs(vc);
2183 start = (ushort *)vc->vc_pos;
2184 myx = vc->vc_x;
2185 continue;
2186 }
2187 if (c != 13)
2188 lf(vc);
2189 cr(vc);
2190 start = (ushort *)vc->vc_pos;
2191 myx = vc->vc_x;
2192 if (c == 10 || c == 13)
2193 continue;
2194 }
2195 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2196 cnt++;
2197 if (myx == vc->vc_cols - 1) {
2198 vc->vc_need_wrap = 1;
2199 continue;
2200 }
2201 vc->vc_pos += 2;
2202 myx++;
2203 }
2204 if (cnt > 0) {
2205 if (CON_IS_VISIBLE(vc))
2206 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2207 vc->vc_x += cnt;
2208 if (vc->vc_x == vc->vc_cols) {
2209 vc->vc_x--;
2210 vc->vc_need_wrap = 1;
2211 }
2212 }
2213 set_cursor(vc);
2214
2215quit:
2216 clear_bit(0, &printing);
2217}
2218
2219static struct tty_driver *vt_console_device(struct console *c, int *index)
2220{
2221 *index = c->index ? c->index-1 : fg_console;
2222 return console_driver;
2223}
2224
2225static struct console vt_console_driver = {
2226 .name = "tty",
2227 .write = vt_console_print,
2228 .device = vt_console_device,
2229 .unblank = unblank_screen,
2230 .flags = CON_PRINTBUFFER,
2231 .index = -1,
2232};
2233#endif
2234
2235/*
2236 * Handling of Linux-specific VC ioctls
2237 */
2238
2239/*
2240 * Generally a bit racy with respect to console_sem().
2241 *
2242 * There are some functions which don't need it.
2243 *
2244 * There are some functions which can sleep for arbitrary periods
2245 * (paste_selection) but we don't need the lock there anyway.
2246 *
2247 * set_selection has locking, and definitely needs it
2248 */
2249
2250int tioclinux(struct tty_struct *tty, unsigned long arg)
2251{
2252 char type, data;
2253 char __user *p = (char __user *)arg;
2254 int lines;
2255 int ret;
2256
2257 if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
2258 return -EINVAL;
2259 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2260 return -EPERM;
2261 if (get_user(type, p))
2262 return -EFAULT;
2263 ret = 0;
2264 switch (type)
2265 {
2266 case TIOCL_SETSEL:
2267 acquire_console_sem();
2268 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2269 release_console_sem();
2270 break;
2271 case TIOCL_PASTESEL:
2272 ret = paste_selection(tty);
2273 break;
2274 case TIOCL_UNBLANKSCREEN:
2275 unblank_screen();
2276 break;
2277 case TIOCL_SELLOADLUT:
2278 ret = sel_loadlut(p);
2279 break;
2280 case TIOCL_GETSHIFTSTATE:
2281
2282 /*
2283 * Make it possible to react to Shift+Mousebutton.
2284 * Note that 'shift_state' is an undocumented
2285 * kernel-internal variable; programs not closely
2286 * related to the kernel should not use this.
2287 */
2288 data = shift_state;
2289 ret = __put_user(data, p);
2290 break;
2291 case TIOCL_GETMOUSEREPORTING:
2292 data = mouse_reporting();
2293 ret = __put_user(data, p);
2294 break;
2295 case TIOCL_SETVESABLANK:
2296 set_vesa_blanking(p);
2297 break;
2298 case TIOCL_SETKMSGREDIRECT:
2299 if (!capable(CAP_SYS_ADMIN)) {
2300 ret = -EPERM;
2301 } else {
2302 if (get_user(data, p+1))
2303 ret = -EFAULT;
2304 else
2305 kmsg_redirect = data;
2306 }
2307 break;
2308 case TIOCL_GETFGCONSOLE:
2309 ret = fg_console;
2310 break;
2311 case TIOCL_SCROLLCONSOLE:
2312 if (get_user(lines, (s32 __user *)(p+4))) {
2313 ret = -EFAULT;
2314 } else {
2315 scrollfront(vc_cons[fg_console].d, lines);
2316 ret = 0;
2317 }
2318 break;
2319 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2320 ignore_poke = 1;
2321 do_blank_screen(0);
2322 break;
2323 case TIOCL_BLANKEDSCREEN:
2324 ret = console_blanked;
2325 break;
2326 default:
2327 ret = -EINVAL;
2328 break;
2329 }
2330 return ret;
2331}
2332
2333/*
2334 * /dev/ttyN handling
2335 */
2336
2337static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2338{
2339 int retval;
2340
2341 retval = do_con_write(tty, buf, count);
2342 con_flush_chars(tty);
2343
2344 return retval;
2345}
2346
2347static void con_put_char(struct tty_struct *tty, unsigned char ch)
2348{
2349 if (in_interrupt())
2350 return; /* n_r3964 calls put_char() from interrupt context */
2351 do_con_write(tty, &ch, 1);
2352}
2353
2354static int con_write_room(struct tty_struct *tty)
2355{
2356 if (tty->stopped)
2357 return 0;
2358 return 4096; /* No limit, really; we're not buffering */
2359}
2360
2361static int con_chars_in_buffer(struct tty_struct *tty)
2362{
2363 return 0; /* we're not buffering */
2364}
2365
2366/*
2367 * con_throttle and con_unthrottle are only used for
2368 * paste_selection(), which has to stuff in a large number of
2369 * characters...
2370 */
2371static void con_throttle(struct tty_struct *tty)
2372{
2373}
2374
2375static void con_unthrottle(struct tty_struct *tty)
2376{
2377 struct vc_data *vc = tty->driver_data;
2378
2379 wake_up_interruptible(&vc->paste_wait);
2380}
2381
2382/*
2383 * Turn the Scroll-Lock LED on when the tty is stopped
2384 */
2385static void con_stop(struct tty_struct *tty)
2386{
2387 int console_num;
2388 if (!tty)
2389 return;
2390 console_num = tty->index;
2391 if (!vc_cons_allocated(console_num))
2392 return;
2393 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2394 set_leds();
2395}
2396
2397/*
2398 * Turn the Scroll-Lock LED off when the console is started
2399 */
2400static void con_start(struct tty_struct *tty)
2401{
2402 int console_num;
2403 if (!tty)
2404 return;
2405 console_num = tty->index;
2406 if (!vc_cons_allocated(console_num))
2407 return;
2408 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2409 set_leds();
2410}
2411
2412static void con_flush_chars(struct tty_struct *tty)
2413{
2414 struct vc_data *vc;
2415
2416 if (in_interrupt()) /* from flush_to_ldisc */
2417 return;
2418
2419 /* if we race with con_close(), vt may be null */
2420 acquire_console_sem();
2421 vc = tty->driver_data;
2422 if (vc)
2423 set_cursor(vc);
2424 release_console_sem();
2425}
2426
2427/*
2428 * Allocate the console screen memory.
2429 */
2430static int con_open(struct tty_struct *tty, struct file *filp)
2431{
2432 unsigned int currcons = tty->index;
2433 int ret = 0;
2434
2435 acquire_console_sem();
2436 if (tty->count == 1) {
2437 ret = vc_allocate(currcons);
2438 if (ret == 0) {
2439 struct vc_data *vc = vc_cons[currcons].d;
2440 tty->driver_data = vc;
2441 vc->vc_tty = tty;
2442
2443 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2444 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2445 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2446 }
2447 release_console_sem();
2448 vcs_make_devfs(tty);
2449 return ret;
2450 }
2451 }
2452 release_console_sem();
2453 return ret;
2454}
2455
2456/*
2457 * We take tty_sem in here to prevent another thread from coming in via init_dev
2458 * and taking a ref against the tty while we're in the process of forgetting
2459 * about it and cleaning things up.
2460 *
2461 * This is because vcs_remove_devfs() can sleep and will drop the BKL.
2462 */
2463static void con_close(struct tty_struct *tty, struct file *filp)
2464{
2465 down(&tty_sem);
2466 acquire_console_sem();
2467 if (tty && tty->count == 1) {
2468 struct vc_data *vc = tty->driver_data;
2469
2470 if (vc)
2471 vc->vc_tty = NULL;
2472 tty->driver_data = NULL;
2473 release_console_sem();
2474 vcs_remove_devfs(tty);
2475 up(&tty_sem);
2476 /*
2477 * tty_sem is released, but we still hold BKL, so there is
2478 * still exclusion against init_dev()
2479 */
2480 return;
2481 }
2482 release_console_sem();
2483 up(&tty_sem);
2484}
2485
2486static void vc_init(struct vc_data *vc, unsigned int rows,
2487 unsigned int cols, int do_clear)
2488{
2489 int j, k ;
2490
2491 vc->vc_cols = cols;
2492 vc->vc_rows = rows;
2493 vc->vc_size_row = cols << 1;
2494 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2495
2496 set_origin(vc);
2497 vc->vc_pos = vc->vc_origin;
2498 reset_vc(vc);
2499 for (j=k=0; j<16; j++) {
2500 vc->vc_palette[k++] = default_red[j] ;
2501 vc->vc_palette[k++] = default_grn[j] ;
2502 vc->vc_palette[k++] = default_blu[j] ;
2503 }
2504 vc->vc_def_color = 0x07; /* white */
2505 vc->vc_ulcolor = 0x0f; /* bold white */
2506 vc->vc_halfcolor = 0x08; /* grey */
2507 init_waitqueue_head(&vc->paste_wait);
2508 reset_terminal(vc, do_clear);
2509}
2510
2511/*
2512 * This routine initializes console interrupts, and does nothing
2513 * else. If you want the screen to clear, call tty_write with
2514 * the appropriate escape-sequence.
2515 */
2516
2517static int __init con_init(void)
2518{
2519 const char *display_desc = NULL;
2520 struct vc_data *vc;
2521 unsigned int currcons = 0;
2522
2523 acquire_console_sem();
2524
2525 if (conswitchp)
2526 display_desc = conswitchp->con_startup();
2527 if (!display_desc) {
2528 fg_console = 0;
2529 release_console_sem();
2530 return 0;
2531 }
2532
2533 init_timer(&console_timer);
2534 console_timer.function = blank_screen_t;
2535 if (blankinterval) {
2536 blank_state = blank_normal_wait;
2537 mod_timer(&console_timer, jiffies + blankinterval);
2538 }
2539
2540 /*
2541 * kmalloc is not running yet - we use the bootmem allocator.
2542 */
2543 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2544 vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
2545 visual_init(vc, currcons, 1);
2546 vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
2547 vc->vc_kmalloced = 0;
2548 vc_init(vc, vc->vc_rows, vc->vc_cols,
2549 currcons || !vc->vc_sw->con_save_screen);
2550 }
2551 currcons = fg_console = 0;
2552 master_display_fg = vc = vc_cons[currcons].d;
2553 set_origin(vc);
2554 save_screen(vc);
2555 gotoxy(vc, vc->vc_x, vc->vc_y);
2556 csi_J(vc, 0);
2557 update_screen(vc);
2558 printk("Console: %s %s %dx%d",
2559 vc->vc_can_do_color ? "colour" : "mono",
2560 display_desc, vc->vc_cols, vc->vc_rows);
2561 printable = 1;
2562 printk("\n");
2563
2564 release_console_sem();
2565
2566#ifdef CONFIG_VT_CONSOLE
2567 register_console(&vt_console_driver);
2568#endif
2569 return 0;
2570}
2571console_initcall(con_init);
2572
2573static struct tty_operations con_ops = {
2574 .open = con_open,
2575 .close = con_close,
2576 .write = con_write,
2577 .write_room = con_write_room,
2578 .put_char = con_put_char,
2579 .flush_chars = con_flush_chars,
2580 .chars_in_buffer = con_chars_in_buffer,
2581 .ioctl = vt_ioctl,
2582 .stop = con_stop,
2583 .start = con_start,
2584 .throttle = con_throttle,
2585 .unthrottle = con_unthrottle,
2586};
2587
2588int __init vty_init(void)
2589{
2590 vcs_init();
2591
2592 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2593 if (!console_driver)
2594 panic("Couldn't allocate console driver\n");
2595 console_driver->owner = THIS_MODULE;
2596 console_driver->devfs_name = "vc/";
2597 console_driver->name = "tty";
2598 console_driver->name_base = 1;
2599 console_driver->major = TTY_MAJOR;
2600 console_driver->minor_start = 1;
2601 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2602 console_driver->init_termios = tty_std_termios;
2603 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2604 tty_set_operations(console_driver, &con_ops);
2605 if (tty_register_driver(console_driver))
2606 panic("Couldn't register console driver\n");
2607
2608 kbd_init();
2609 console_map_init();
2610#ifdef CONFIG_PROM_CONSOLE
2611 prom_con_init();
2612#endif
2613#ifdef CONFIG_MDA_CONSOLE
2614 mda_console_init();
2615#endif
2616 return 0;
2617}
2618
2619#ifndef VT_SINGLE_DRIVER
2620
2621/*
2622 * If we support more console drivers, this function is used
2623 * when a driver wants to take over some existing consoles
2624 * and become default driver for newly opened ones.
2625 */
2626
2627int take_over_console(const struct consw *csw, int first, int last, int deflt)
2628{
2629 int i, j = -1;
2630 const char *desc;
2631 struct module *owner;
2632
2633 owner = csw->owner;
2634 if (!try_module_get(owner))
2635 return -ENODEV;
2636
2637 acquire_console_sem();
2638
2639 desc = csw->con_startup();
2640 if (!desc) {
2641 release_console_sem();
2642 module_put(owner);
2643 return -ENODEV;
2644 }
2645 if (deflt) {
2646 if (conswitchp)
2647 module_put(conswitchp->owner);
2648 __module_get(owner);
2649 conswitchp = csw;
2650 }
2651
2652 for (i = first; i <= last; i++) {
2653 int old_was_color;
2654 struct vc_data *vc = vc_cons[i].d;
2655
2656 if (con_driver_map[i])
2657 module_put(con_driver_map[i]->owner);
2658 __module_get(owner);
2659 con_driver_map[i] = csw;
2660
2661 if (!vc || !vc->vc_sw)
2662 continue;
2663
2664 j = i;
2665 if (CON_IS_VISIBLE(vc))
2666 save_screen(vc);
2667 old_was_color = vc->vc_can_do_color;
2668 vc->vc_sw->con_deinit(vc);
2669 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
2670 vc->vc_visible_origin = vc->vc_origin;
2671 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
2672 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
2673 visual_init(vc, i, 0);
2674 update_attr(vc);
2675
2676 /* If the console changed between mono <-> color, then
2677 * the attributes in the screenbuf will be wrong. The
2678 * following resets all attributes to something sane.
2679 */
2680 if (old_was_color != vc->vc_can_do_color)
2681 clear_buffer_attributes(vc);
2682
2683 if (CON_IS_VISIBLE(vc))
2684 update_screen(vc);
2685 }
2686 printk("Console: switching ");
2687 if (!deflt)
2688 printk("consoles %d-%d ", first+1, last+1);
2689 if (j >= 0)
2690 printk("to %s %s %dx%d\n",
2691 vc_cons[j].d->vc_can_do_color ? "colour" : "mono",
2692 desc, vc_cons[j].d->vc_cols, vc_cons[j].d->vc_rows);
2693 else
2694 printk("to %s\n", desc);
2695
2696 release_console_sem();
2697
2698 module_put(owner);
2699 return 0;
2700}
2701
2702void give_up_console(const struct consw *csw)
2703{
2704 int i;
2705
2706 for(i = 0; i < MAX_NR_CONSOLES; i++)
2707 if (con_driver_map[i] == csw) {
2708 module_put(csw->owner);
2709 con_driver_map[i] = NULL;
2710 }
2711}
2712
2713#endif
2714
2715/*
2716 * Screen blanking
2717 */
2718
2719static void set_vesa_blanking(char __user *p)
2720{
2721 unsigned int mode;
2722 get_user(mode, p + 1);
2723 vesa_blank_mode = (mode < 4) ? mode : 0;
2724}
2725
2726/*
2727 * This is called by a timer handler
2728 */
2729static void vesa_powerdown(void)
2730{
2731 struct vc_data *c = vc_cons[fg_console].d;
2732 /*
2733 * Power down if currently suspended (1 or 2),
2734 * suspend if currently blanked (0),
2735 * else do nothing (i.e. already powered down (3)).
2736 * Called only if powerdown features are allowed.
2737 */
2738 switch (vesa_blank_mode) {
2739 case VESA_NO_BLANKING:
2740 c->vc_sw->con_blank(c, VESA_VSYNC_SUSPEND+1, 0);
2741 break;
2742 case VESA_VSYNC_SUSPEND:
2743 case VESA_HSYNC_SUSPEND:
2744 c->vc_sw->con_blank(c, VESA_POWERDOWN+1, 0);
2745 break;
2746 }
2747}
2748
2749void do_blank_screen(int entering_gfx)
2750{
2751 struct vc_data *vc = vc_cons[fg_console].d;
2752 int i;
2753
2754 WARN_CONSOLE_UNLOCKED();
2755
2756 if (console_blanked) {
2757 if (blank_state == blank_vesa_wait) {
2758 blank_state = blank_off;
2759 vesa_powerdown();
2760
2761 }
2762 return;
2763 }
2764 if (blank_state != blank_normal_wait)
2765 return;
2766 blank_state = blank_off;
2767
2768 /* entering graphics mode? */
2769 if (entering_gfx) {
2770 hide_cursor(vc);
2771 save_screen(vc);
2772 vc->vc_sw->con_blank(vc, -1, 1);
2773 console_blanked = fg_console + 1;
2774 set_origin(vc);
2775 return;
2776 }
2777
2778 /* don't blank graphics */
2779 if (vc->vc_mode != KD_TEXT) {
2780 console_blanked = fg_console + 1;
2781 return;
2782 }
2783
2784 hide_cursor(vc);
2785 del_timer_sync(&console_timer);
2786 blank_timer_expired = 0;
2787
2788 save_screen(vc);
2789 /* In case we need to reset origin, blanking hook returns 1 */
2790 i = vc->vc_sw->con_blank(vc, 1, 0);
2791 console_blanked = fg_console + 1;
2792 if (i)
2793 set_origin(vc);
2794
2795 if (console_blank_hook && console_blank_hook(1))
2796 return;
2797
2798 if (vesa_off_interval) {
2799 blank_state = blank_vesa_wait,
2800 mod_timer(&console_timer, jiffies + vesa_off_interval);
2801 }
2802
2803 if (vesa_blank_mode)
2804 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
2805}
2806EXPORT_SYMBOL(do_blank_screen);
2807
2808/*
2809 * Called by timer as well as from vt_console_driver
2810 */
2811void do_unblank_screen(int leaving_gfx)
2812{
2813 struct vc_data *vc;
2814
2815 /* This should now always be called from a "sane" (read: can schedule)
2816 * context for the sake of the low level drivers, except in the special
2817 * case of oops_in_progress
2818 */
2819 if (!oops_in_progress)
2820 might_sleep();
2821
2822 WARN_CONSOLE_UNLOCKED();
2823
2824 ignore_poke = 0;
2825 if (!console_blanked)
2826 return;
2827 if (!vc_cons_allocated(fg_console)) {
2828 /* impossible */
2829 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
2830 return;
2831 }
2832 vc = vc_cons[fg_console].d;
2833 if (vc->vc_mode != KD_TEXT)
2834 return; /* but leave console_blanked != 0 */
2835
2836 if (blankinterval) {
2837 mod_timer(&console_timer, jiffies + blankinterval);
2838 blank_state = blank_normal_wait;
2839 }
2840
2841 console_blanked = 0;
2842 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
2843 /* Low-level driver cannot restore -> do it ourselves */
2844 update_screen(vc);
2845 if (console_blank_hook)
2846 console_blank_hook(0);
2847 set_palette(vc);
2848 set_cursor(vc);
2849}
2850EXPORT_SYMBOL(do_unblank_screen);
2851
2852/*
2853 * This is called by the outside world to cause a forced unblank, mostly for
2854 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
2855 * call it with 1 as an argument and so force a mode restore... that may kill
2856 * X or at least garbage the screen but would also make the Oops visible...
2857 */
2858void unblank_screen(void)
2859{
2860 do_unblank_screen(0);
2861}
2862
2863/*
2864 * We defer the timer blanking to work queue so it can take the console semaphore
2865 * (console operations can still happen at irq time, but only from printk which
2866 * has the console semaphore. Not perfect yet, but better than no locking
2867 */
2868static void blank_screen_t(unsigned long dummy)
2869{
2870 blank_timer_expired = 1;
2871 schedule_work(&console_work);
2872}
2873
2874void poke_blanked_console(void)
2875{
2876 WARN_CONSOLE_UNLOCKED();
2877
2878 /* Add this so we quickly catch whoever might call us in a non
2879 * safe context. Nowadays, unblank_screen() isn't to be called in
2880 * atomic contexts and is allowed to schedule (with the special case
2881 * of oops_in_progress, but that isn't of any concern for this
2882 * function. --BenH.
2883 */
2884 might_sleep();
2885
2886 /* This isn't perfectly race free, but a race here would be mostly harmless,
2887 * at worse, we'll do a spurrious blank and it's unlikely
2888 */
2889 del_timer(&console_timer);
2890 blank_timer_expired = 0;
2891
2892 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
2893 return;
2894 if (console_blanked)
2895 unblank_screen();
2896 else if (blankinterval) {
2897 mod_timer(&console_timer, jiffies + blankinterval);
2898 blank_state = blank_normal_wait;
2899 }
2900}
2901
2902/*
2903 * Palettes
2904 */
2905
2906static void set_palette(struct vc_data *vc)
2907{
2908 WARN_CONSOLE_UNLOCKED();
2909
2910 if (vc->vc_mode != KD_GRAPHICS)
2911 vc->vc_sw->con_set_palette(vc, color_table);
2912}
2913
2914static int set_get_cmap(unsigned char __user *arg, int set)
2915{
2916 int i, j, k;
2917
2918 WARN_CONSOLE_UNLOCKED();
2919
2920 for (i = 0; i < 16; i++)
2921 if (set) {
2922 get_user(default_red[i], arg++);
2923 get_user(default_grn[i], arg++);
2924 get_user(default_blu[i], arg++);
2925 } else {
2926 put_user(default_red[i], arg++);
2927 put_user(default_grn[i], arg++);
2928 put_user(default_blu[i], arg++);
2929 }
2930 if (set) {
2931 for (i = 0; i < MAX_NR_CONSOLES; i++)
2932 if (vc_cons_allocated(i)) {
2933 for (j = k = 0; j < 16; j++) {
2934 vc_cons[i].d->vc_palette[k++] = default_red[j];
2935 vc_cons[i].d->vc_palette[k++] = default_grn[j];
2936 vc_cons[i].d->vc_palette[k++] = default_blu[j];
2937 }
2938 set_palette(vc_cons[i].d);
2939 }
2940 }
2941 return 0;
2942}
2943
2944/*
2945 * Load palette into the DAC registers. arg points to a colour
2946 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
2947 */
2948
2949int con_set_cmap(unsigned char __user *arg)
2950{
2951 int rc;
2952
2953 acquire_console_sem();
2954 rc = set_get_cmap (arg,1);
2955 release_console_sem();
2956
2957 return rc;
2958}
2959
2960int con_get_cmap(unsigned char __user *arg)
2961{
2962 int rc;
2963
2964 acquire_console_sem();
2965 rc = set_get_cmap (arg,0);
2966 release_console_sem();
2967
2968 return rc;
2969}
2970
2971void reset_palette(struct vc_data *vc)
2972{
2973 int j, k;
2974 for (j=k=0; j<16; j++) {
2975 vc->vc_palette[k++] = default_red[j];
2976 vc->vc_palette[k++] = default_grn[j];
2977 vc->vc_palette[k++] = default_blu[j];
2978 }
2979 set_palette(vc);
2980}
2981
2982/*
2983 * Font switching
2984 *
2985 * Currently we only support fonts up to 32 pixels wide, at a maximum height
2986 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
2987 * depending on width) reserved for each character which is kinda wasty, but
2988 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
2989 * is upto the actual low-level console-driver convert data into its favorite
2990 * format (maybe we should add a `fontoffset' field to the `display'
2991 * structure so we won't have to convert the fontdata all the time.
2992 * /Jes
2993 */
2994
2995#define max_font_size 65536
2996
2997static int con_font_get(struct vc_data *vc, struct console_font_op *op)
2998{
2999 struct console_font font;
3000 int rc = -EINVAL;
3001 int c;
3002
3003 if (vc->vc_mode != KD_TEXT)
3004 return -EINVAL;
3005
3006 if (op->data) {
3007 font.data = kmalloc(max_font_size, GFP_KERNEL);
3008 if (!font.data)
3009 return -ENOMEM;
3010 } else
3011 font.data = NULL;
3012
3013 acquire_console_sem();
3014 if (vc->vc_sw->con_font_get)
3015 rc = vc->vc_sw->con_font_get(vc, &font);
3016 else
3017 rc = -ENOSYS;
3018 release_console_sem();
3019
3020 if (rc)
3021 goto out;
3022
3023 c = (font.width+7)/8 * 32 * font.charcount;
3024
3025 if (op->data && font.charcount > op->charcount)
3026 rc = -ENOSPC;
3027 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3028 if (font.width > op->width || font.height > op->height)
3029 rc = -ENOSPC;
3030 } else {
3031 if (font.width != 8)
3032 rc = -EIO;
3033 else if ((op->height && font.height > op->height) ||
3034 font.height > 32)
3035 rc = -ENOSPC;
3036 }
3037 if (rc)
3038 goto out;
3039
3040 op->height = font.height;
3041 op->width = font.width;
3042 op->charcount = font.charcount;
3043
3044 if (op->data && copy_to_user(op->data, font.data, c))
3045 rc = -EFAULT;
3046
3047out:
3048 kfree(font.data);
3049 return rc;
3050}
3051
3052static int con_font_set(struct vc_data *vc, struct console_font_op *op)
3053{
3054 struct console_font font;
3055 int rc = -EINVAL;
3056 int size;
3057
3058 if (vc->vc_mode != KD_TEXT)
3059 return -EINVAL;
3060 if (!op->data)
3061 return -EINVAL;
3062 if (op->charcount > 512)
3063 return -EINVAL;
3064 if (!op->height) { /* Need to guess font height [compat] */
3065 int h, i;
3066 u8 __user *charmap = op->data;
3067 u8 tmp;
3068
3069 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
3070 so that we can get rid of this soon */
3071 if (!(op->flags & KD_FONT_FLAG_OLD))
3072 return -EINVAL;
3073 for (h = 32; h > 0; h--)
3074 for (i = 0; i < op->charcount; i++) {
3075 if (get_user(tmp, &charmap[32*i+h-1]))
3076 return -EFAULT;
3077 if (tmp)
3078 goto nonzero;
3079 }
3080 return -EINVAL;
3081 nonzero:
3082 op->height = h;
3083 }
3084 if (op->width <= 0 || op->width > 32 || op->height > 32)
3085 return -EINVAL;
3086 size = (op->width+7)/8 * 32 * op->charcount;
3087 if (size > max_font_size)
3088 return -ENOSPC;
3089 font.charcount = op->charcount;
3090 font.height = op->height;
3091 font.width = op->width;
3092 font.data = kmalloc(size, GFP_KERNEL);
3093 if (!font.data)
3094 return -ENOMEM;
3095 if (copy_from_user(font.data, op->data, size)) {
3096 kfree(font.data);
3097 return -EFAULT;
3098 }
3099 acquire_console_sem();
3100 if (vc->vc_sw->con_font_set)
3101 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
3102 else
3103 rc = -ENOSYS;
3104 release_console_sem();
3105 kfree(font.data);
3106 return rc;
3107}
3108
3109static int con_font_default(struct vc_data *vc, struct console_font_op *op)
3110{
3111 struct console_font font = {.width = op->width, .height = op->height};
3112 char name[MAX_FONT_NAME];
3113 char *s = name;
3114 int rc;
3115
3116 if (vc->vc_mode != KD_TEXT)
3117 return -EINVAL;
3118
3119 if (!op->data)
3120 s = NULL;
3121 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
3122 return -EFAULT;
3123 else
3124 name[MAX_FONT_NAME - 1] = 0;
3125
3126 acquire_console_sem();
3127 if (vc->vc_sw->con_font_default)
3128 rc = vc->vc_sw->con_font_default(vc, &font, s);
3129 else
3130 rc = -ENOSYS;
3131 release_console_sem();
3132 if (!rc) {
3133 op->width = font.width;
3134 op->height = font.height;
3135 }
3136 return rc;
3137}
3138
3139static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
3140{
3141 int con = op->height;
3142 int rc;
3143
3144 if (vc->vc_mode != KD_TEXT)
3145 return -EINVAL;
3146
3147 acquire_console_sem();
3148 if (!vc->vc_sw->con_font_copy)
3149 rc = -ENOSYS;
3150 else if (con < 0 || !vc_cons_allocated(con))
3151 rc = -ENOTTY;
3152 else if (con == vc->vc_num) /* nothing to do */
3153 rc = 0;
3154 else
3155 rc = vc->vc_sw->con_font_copy(vc, con);
3156 release_console_sem();
3157 return rc;
3158}
3159
3160int con_font_op(struct vc_data *vc, struct console_font_op *op)
3161{
3162 switch (op->op) {
3163 case KD_FONT_OP_SET:
3164 return con_font_set(vc, op);
3165 case KD_FONT_OP_GET:
3166 return con_font_get(vc, op);
3167 case KD_FONT_OP_SET_DEFAULT:
3168 return con_font_default(vc, op);
3169 case KD_FONT_OP_COPY:
3170 return con_font_copy(vc, op);
3171 }
3172 return -ENOSYS;
3173}
3174
3175/*
3176 * Interface exported to selection and vcs.
3177 */
3178
3179/* used by selection */
3180u16 screen_glyph(struct vc_data *vc, int offset)
3181{
3182 u16 w = scr_readw(screenpos(vc, offset, 1));
3183 u16 c = w & 0xff;
3184
3185 if (w & vc->vc_hi_font_mask)
3186 c |= 0x100;
3187 return c;
3188}
3189
3190/* used by vcs - note the word offset */
3191unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
3192{
3193 return screenpos(vc, 2 * w_offset, viewed);
3194}
3195
3196void getconsxy(struct vc_data *vc, unsigned char *p)
3197{
3198 p[0] = vc->vc_x;
3199 p[1] = vc->vc_y;
3200}
3201
3202void putconsxy(struct vc_data *vc, unsigned char *p)
3203{
3204 gotoxy(vc, p[0], p[1]);
3205 set_cursor(vc);
3206}
3207
3208u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
3209{
3210 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
3211 return softcursor_original;
3212 return scr_readw(org);
3213}
3214
3215void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
3216{
3217 scr_writew(val, org);
3218 if ((unsigned long)org == vc->vc_pos) {
3219 softcursor_original = -1;
3220 add_softcursor(vc);
3221 }
3222}
3223
3224/*
3225 * Visible symbols for modules
3226 */
3227
3228EXPORT_SYMBOL(color_table);
3229EXPORT_SYMBOL(default_red);
3230EXPORT_SYMBOL(default_grn);
3231EXPORT_SYMBOL(default_blu);
3232EXPORT_SYMBOL(update_region);
3233EXPORT_SYMBOL(redraw_screen);
3234EXPORT_SYMBOL(vc_resize);
3235EXPORT_SYMBOL(fg_console);
3236EXPORT_SYMBOL(console_blank_hook);
3237EXPORT_SYMBOL(console_blanked);
3238EXPORT_SYMBOL(vc_cons);
3239#ifndef VT_SINGLE_DRIVER
3240EXPORT_SYMBOL(take_over_console);
3241EXPORT_SYMBOL(give_up_console);
3242#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-17 12:40:10 -0500