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[linux.git] / drivers / char / vt.c
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1da177e4
LT		 1/*
2 * linux/drivers/char/vt.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * Hopefully this will be a rather complete VT102 implementation.
9 *
10 * Beeping thanks to John T Kohl.
11 *
12 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
13 * Chars, and VT100 enhancements by Peter MacDonald.
14 *
15 * Copy and paste function by Andrew Haylett,
16 * some enhancements by Alessandro Rubini.
17 *
18 * Code to check for different video-cards mostly by Galen Hunt,
19 * <[email protected]>
20 *
21 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
22 * Markus Kuhn, <[email protected]>.
23 *
24 * Dynamic allocation of consoles, [email protected], May 1994
25 * Resizing of consoles, aeb, 940926
26 *
27 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
28 * <[email protected]>
29 *
30 * User-defined bell sound, new setterm control sequences and printk
31 * redirection by Martin Mares <[email protected]> 19-Nov-95
32 *
33 * APM screenblank bug fixed Takashi Manabe <[email protected]>
34 *
35 * Merge with the abstract console driver by Geert Uytterhoeven
36 * <[email protected]>, Jan 1997.
37 *
38 * Original m68k console driver modifications by
39 *
40 * - Arno Griffioen <[email protected]>
41 * - David Carter <[email protected]>
42 *
43 * The abstract console driver provides a generic interface for a text
44 * console. It supports VGA text mode, frame buffer based graphical consoles
45 * and special graphics processors that are only accessible through some
46 * registers (e.g. a TMS340x0 GSP).
47 *
48 * The interface to the hardware is specified using a special structure
49 * (struct consw) which contains function pointers to console operations
50 * (see <linux/console.h> for more information).
51 *
52 * Support for changeable cursor shape
53 * by Pavel Machek <[email protected]>, August 1997
54 *
55 * Ported to i386 and con_scrolldelta fixed
56 * by Emmanuel Marty <[email protected]>, April 1998
57 *
58 * Resurrected character buffers in videoram plus lots of other trickery
59 * by Martin Mares <[email protected]>, July 1998
60 *
61 * Removed old-style timers, introduced console_timer, made timer
e1f8e874 62 * deletion SMP-safe. 17Jun00, Andrew Morton
1da177e4
LT		 63 *
64 * Removed console_lock, enabled interrupts across all console operations
65 * 13 March 2001, Andrew Morton
d4328b40
AT		 66 *
67 * Fixed UTF-8 mode so alternate charset modes always work according
68 * to control sequences interpreted in do_con_trol function
69 * preserving backward VT100 semigraphics compatibility,
70 * malformed UTF sequences represented as sequences of replacement glyphs,
71 * original codes or '?' as a last resort if replacement glyph is undefined
72 * by Adam Tla/lka <[email protected]>, Aug 2006
1da177e4
LT		 73 */
74
75#include <linux/module.h>
76#include <linux/types.h>
77#include <linux/sched.h>
78#include <linux/tty.h>
79#include <linux/tty_flip.h>
80#include <linux/kernel.h>
81#include <linux/string.h>
82#include <linux/errno.h>
83#include <linux/kd.h>
84#include <linux/slab.h>
85#include <linux/major.h>
86#include <linux/mm.h>
87#include <linux/console.h>
88#include <linux/init.h>
c831c338 89#include <linux/mutex.h>
1da177e4
LT		 90#include <linux/vt_kern.h>
91#include <linux/selection.h>
405f5571 92#include <linux/smp_lock.h>
1da177e4
LT		 93#include <linux/tiocl.h>
94#include <linux/kbd_kern.h>
95#include <linux/consolemap.h>
96#include <linux/timer.h>
97#include <linux/interrupt.h>
1da177e4 98#include <linux/workqueue.h>
1da177e4
LT		 99#include <linux/pm.h>
100#include <linux/font.h>
101#include <linux/bitops.h>
b293d758 102#include <linux/notifier.h>
d81ed103
AC		 103#include <linux/device.h>
104#include <linux/io.h>
1da177e4 105#include <asm/system.h>
d81ed103 106#include <linux/uaccess.h>
81d44507 107#include <linux/kdb.h>
74c807ce 108#include <linux/ctype.h>
1da177e4 109
3e795de7 110#define MAX_NR_CON_DRIVER 16
1da177e4 111
6db4063c 112#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 113#define CON_DRIVER_FLAG_INIT 2
114#define CON_DRIVER_FLAG_ATTR 4
3e795de7
AD		 115
116struct con_driver {
117 const struct consw *con;
118 const char *desc;
805952a8 119 struct device *dev;
6db4063c 120 int node;
3e795de7
AD		 121 int first;
122 int last;
123 int flag;
124};
125
126static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 127const struct consw *conswitchp;
128
129/* A bitmap for codes <32. A bit of 1 indicates that the code
130 * corresponding to that bit number invokes some special action
131 * (such as cursor movement) and should not be displayed as a
132 * glyph unless the disp_ctrl mode is explicitly enabled.
133 */
134#define CTRL_ACTION 0x0d00ff81
135#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
136
137/*
138 * Here is the default bell parameters: 750HZ, 1/8th of a second
139 */
140#define DEFAULT_BELL_PITCH 750
141#define DEFAULT_BELL_DURATION (HZ/8)
142
1da177e4
LT		 143struct vc vc_cons [MAX_NR_CONSOLES];
144
145#ifndef VT_SINGLE_DRIVER
146static const struct consw *con_driver_map[MAX_NR_CONSOLES];
147#endif
148
149static int con_open(struct tty_struct *, struct file *);
150static void vc_init(struct vc_data *vc, unsigned int rows,
151 unsigned int cols, int do_clear);
152static void gotoxy(struct vc_data *vc, int new_x, int new_y);
153static void save_cur(struct vc_data *vc);
154static void reset_terminal(struct vc_data *vc, int do_clear);
155static void con_flush_chars(struct tty_struct *tty);
403aac96 156static int set_vesa_blanking(char __user *p);
1da177e4
LT		 157static void set_cursor(struct vc_data *vc);
158static void hide_cursor(struct vc_data *vc);
65f27f38 159static void console_callback(struct work_struct *ignored);
1da177e4
LT		 160static void blank_screen_t(unsigned long dummy);
161static void set_palette(struct vc_data *vc);
162
163static int printable; /* Is console ready for printing? */
77bf2bab 164int default_utf8 = true;
042f10ec 165module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 166int global_cursor_default = -1;
167module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 168
9ea9a886
CL		 169static int cur_default = CUR_DEFAULT;
170module_param(cur_default, int, S_IRUGO | S_IWUSR);
171
1da177e4
LT		 172/*
173 * ignore_poke: don't unblank the screen when things are typed. This is
174 * mainly for the privacy of braille terminal users.
175 */
176static int ignore_poke;
177
178int do_poke_blanked_console;
179int console_blanked;
180
181static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 182static int vesa_off_interval;
f324edc8
DM		 183static int blankinterval = 10*60;
184core_param(consoleblank, blankinterval, int, 0444);
1da177e4 185
65f27f38 186static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 187
188/*
189 * fg_console is the current virtual console,
190 * last_console is the last used one,
191 * want_console is the console we want to switch to,
b45cfba4 192 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 193 */
194int fg_console;
195int last_console;
196int want_console = -1;
fed891c8
JW		 197static int saved_fg_console;
198static int saved_last_console;
199static int saved_want_console;
200static int saved_vc_mode;
beed5336 201static int saved_console_blanked;
1da177e4
LT		 202
203/*
204 * For each existing display, we have a pointer to console currently visible
205 * on that display, allowing consoles other than fg_console to be refreshed
206 * appropriately. Unless the low-level driver supplies its own display_fg
207 * variable, we use this one for the "master display".
208 */
209static struct vc_data *master_display_fg;
210
211/*
212 * Unfortunately, we need to delay tty echo when we're currently writing to the
213 * console since the code is (and always was) not re-entrant, so we schedule
214 * all flip requests to process context with schedule-task() and run it from
215 * console_callback().
216 */
217
218/*
219 * For the same reason, we defer scrollback to the console callback.
220 */
221static int scrollback_delta;
222
223/*
224 * Hook so that the power management routines can (un)blank
225 * the console on our behalf.
226 */
227int (*console_blank_hook)(int);
228
40565f19 229static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 230static int blank_state;
231static int blank_timer_expired;
232enum {
233 blank_off = 0,
234 blank_normal_wait,
235 blank_vesa_wait,
236};
237
b293d758
ST		 238/*
239 * Notifier list for console events.
240 */
241static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
242
243int register_vt_notifier(struct notifier_block *nb)
244{
245 return atomic_notifier_chain_register(&vt_notifier_list, nb);
246}
247EXPORT_SYMBOL_GPL(register_vt_notifier);
248
249int unregister_vt_notifier(struct notifier_block *nb)
250{
251 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
252}
253EXPORT_SYMBOL_GPL(unregister_vt_notifier);
254
255static void notify_write(struct vc_data *vc, unsigned int unicode)
256{
257 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
258 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
259}
260
261static void notify_update(struct vc_data *vc)
262{
263 struct vt_notifier_param param = { .vc = vc };
264 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
265}
1da177e4
LT		 266/*
267 * Low-Level Functions
268 */
269
270#define IS_FG(vc) ((vc)->vc_num == fg_console)
271
272#ifdef VT_BUF_VRAM_ONLY
273#define DO_UPDATE(vc) 0
274#else
f700d6e5 275#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 276#endif
277
278static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
279{
280 unsigned short *p;
281
282 if (!viewed)
283 p = (unsigned short *)(vc->vc_origin + offset);
284 else if (!vc->vc_sw->con_screen_pos)
285 p = (unsigned short *)(vc->vc_visible_origin + offset);
286 else
287 p = vc->vc_sw->con_screen_pos(vc, offset);
288 return p;
289}
290
e33ac1c1 291/* Called from the keyboard irq path.. */
1da177e4
LT		 292static inline void scrolldelta(int lines)
293{
e33ac1c1
AC		 294 /* FIXME */
295 /* scrolldelta needs some kind of consistency lock, but the BKL was
296 and still is not protecting versus the scheduled back end */
1da177e4
LT		 297 scrollback_delta += lines;
298 schedule_console_callback();
299}
300
301void schedule_console_callback(void)
302{
303 schedule_work(&console_work);
304}
305
306static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
307{
308 unsigned short *d, *s;
309
310 if (t+nr >= b)
311 nr = b - t - 1;
312 if (b > vc->vc_rows || t >= b || nr < 1)
313 return;
314 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
315 return;
316 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
317 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
318 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 319 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 320 vc->vc_size_row * nr);
321}
322
323static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
324{
325 unsigned short *s;
326 unsigned int step;
327
328 if (t+nr >= b)
329 nr = b - t - 1;
330 if (b > vc->vc_rows || t >= b || nr < 1)
331 return;
332 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
333 return;
334 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
335 step = vc->vc_cols * nr;
336 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 337 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 338}
339
340static void do_update_region(struct vc_data *vc, unsigned long start, int count)
341{
342#ifndef VT_BUF_VRAM_ONLY
343 unsigned int xx, yy, offset;
344 u16 *p;
345
346 p = (u16 *) start;
347 if (!vc->vc_sw->con_getxy) {
348 offset = (start - vc->vc_origin) / 2;
349 xx = offset % vc->vc_cols;
350 yy = offset / vc->vc_cols;
351 } else {
352 int nxx, nyy;
353 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
354 xx = nxx; yy = nyy;
355 }
356 for(;;) {
357 u16 attrib = scr_readw(p) & 0xff00;
358 int startx = xx;
359 u16 *q = p;
360 while (xx < vc->vc_cols && count) {
361 if (attrib != (scr_readw(p) & 0xff00)) {
362 if (p > q)
363 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
364 startx = xx;
365 q = p;
366 attrib = scr_readw(p) & 0xff00;
367 }
368 p++;
369 xx++;
370 count--;
371 }
372 if (p > q)
373 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
374 if (!count)
375 break;
376 xx = 0;
377 yy++;
378 if (vc->vc_sw->con_getxy) {
379 p = (u16 *)start;
380 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
381 }
382 }
383#endif
384}
385
386void update_region(struct vc_data *vc, unsigned long start, int count)
387{
388 WARN_CONSOLE_UNLOCKED();
389
390 if (DO_UPDATE(vc)) {
391 hide_cursor(vc);
392 do_update_region(vc, start, count);
393 set_cursor(vc);
394 }
395}
396
397/* Structure of attributes is hardware-dependent */
398
fa6ce9ab
JE		 399static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
400 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 401{
402 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 403 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
404 _blink, _underline, _reverse, _italic);
1da177e4
LT		 405
406#ifndef VT_BUF_VRAM_ONLY
407/*
408 * ++roman: I completely changed the attribute format for monochrome
409 * mode (!can_do_color). The formerly used MDA (monochrome display
410 * adapter) format didn't allow the combination of certain effects.
411 * Now the attribute is just a bit vector:
412 * Bit 0..1: intensity (0..2)
413 * Bit 2 : underline
414 * Bit 3 : reverse
415 * Bit 7 : blink
416 */
417 {
c9e587ab 418 u8 a = _color;
1da177e4
LT		 419 if (!vc->vc_can_do_color)
420 return _intensity |
fa6ce9ab 421 (_italic ? 2 : 0) |
1da177e4
LT		 422 (_underline ? 4 : 0) |
423 (_reverse ? 8 : 0) |
424 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 425 if (_italic)
426 a = (a & 0xF0) | vc->vc_itcolor;
427 else if (_underline)
1da177e4
LT		 428 a = (a & 0xf0) | vc->vc_ulcolor;
429 else if (_intensity == 0)
430 a = (a & 0xf0) | vc->vc_ulcolor;
431 if (_reverse)
432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
433 if (_blink)
434 a ^= 0x80;
435 if (_intensity == 2)
436 a ^= 0x08;
437 if (vc->vc_hi_font_mask == 0x100)
438 a <<= 1;
439 return a;
440 }
441#else
442 return 0;
443#endif
444}
445
446static void update_attr(struct vc_data *vc)
447{
fa6ce9ab
JE		 448 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
449 vc->vc_blink, vc->vc_underline,
450 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
451 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 452}
453
454/* Note: inverting the screen twice should revert to the original state */
455void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
456{
457 unsigned short *p;
458
459 WARN_CONSOLE_UNLOCKED();
460
461 count /= 2;
462 p = screenpos(vc, offset, viewed);
463 if (vc->vc_sw->con_invert_region)
464 vc->vc_sw->con_invert_region(vc, p, count);
465#ifndef VT_BUF_VRAM_ONLY
466 else {
467 u16 *q = p;
468 int cnt = count;
469 u16 a;
470
471 if (!vc->vc_can_do_color) {
472 while (cnt--) {
473 a = scr_readw(q);
474 a ^= 0x0800;
475 scr_writew(a, q);
476 q++;
477 }
478 } else if (vc->vc_hi_font_mask == 0x100) {
479 while (cnt--) {
480 a = scr_readw(q);
481 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
482 scr_writew(a, q);
483 q++;
484 }
485 } else {
486 while (cnt--) {
487 a = scr_readw(q);
488 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
489 scr_writew(a, q);
490 q++;
491 }
492 }
493 }
494#endif
495 if (DO_UPDATE(vc))
496 do_update_region(vc, (unsigned long) p, count);
497}
498
499/* used by selection: complement pointer position */
500void complement_pos(struct vc_data *vc, int offset)
501{
414edcd3 502 static int old_offset = -1;
1da177e4
LT		 503 static unsigned short old;
504 static unsigned short oldx, oldy;
505
506 WARN_CONSOLE_UNLOCKED();
507
414edcd3
AD		 508 if (old_offset != -1 && old_offset >= 0 &&
509 old_offset < vc->vc_screenbuf_size) {
510 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 511 if (DO_UPDATE(vc))
512 vc->vc_sw->con_putc(vc, old, oldy, oldx);
513 }
414edcd3
AD		 514
515 old_offset = offset;
516
517 if (offset != -1 && offset >= 0 &&
518 offset < vc->vc_screenbuf_size) {
1da177e4 519 unsigned short new;
414edcd3 520 unsigned short *p;
1da177e4
LT		 521 p = screenpos(vc, offset, 1);
522 old = scr_readw(p);
523 new = old ^ vc->vc_complement_mask;
524 scr_writew(new, p);
525 if (DO_UPDATE(vc)) {
526 oldx = (offset >> 1) % vc->vc_cols;
527 oldy = (offset >> 1) / vc->vc_cols;
528 vc->vc_sw->con_putc(vc, new, oldy, oldx);
529 }
530 }
414edcd3 531
1da177e4
LT		 532}
533
534static void insert_char(struct vc_data *vc, unsigned int nr)
535{
536 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
537
538 p = q + vc->vc_cols - nr - vc->vc_x;
539 while (--p >= q)
540 scr_writew(scr_readw(p), p + nr);
541 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
542 vc->vc_need_wrap = 0;
543 if (DO_UPDATE(vc)) {
544 unsigned short oldattr = vc->vc_attr;
545 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
546 vc->vc_cols - vc->vc_x - nr);
547 vc->vc_attr = vc->vc_video_erase_char >> 8;
548 while (nr--)
549 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
550 vc->vc_attr = oldattr;
551 }
552}
553
554static void delete_char(struct vc_data *vc, unsigned int nr)
555{
556 unsigned int i = vc->vc_x;
557 unsigned short *p = (unsigned short *)vc->vc_pos;
558
559 while (++i <= vc->vc_cols - nr) {
560 scr_writew(scr_readw(p+nr), p);
561 p++;
562 }
563 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
564 vc->vc_need_wrap = 0;
565 if (DO_UPDATE(vc)) {
566 unsigned short oldattr = vc->vc_attr;
567 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
568 vc->vc_cols - vc->vc_x - nr);
569 vc->vc_attr = vc->vc_video_erase_char >> 8;
570 while (nr--)
571 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
572 vc->vc_cols - 1 - nr);
573 vc->vc_attr = oldattr;
574 }
575}
576
577static int softcursor_original;
578
579static void add_softcursor(struct vc_data *vc)
580{
581 int i = scr_readw((u16 *) vc->vc_pos);
582 u32 type = vc->vc_cursor_type;
583
584 if (! (type & 0x10)) return;
585 if (softcursor_original != -1) return;
586 softcursor_original = i;
587 i |= ((type >> 8) & 0xff00 );
588 i ^= ((type) & 0xff00 );
589 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
590 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
591 scr_writew(i, (u16 *) vc->vc_pos);
592 if (DO_UPDATE(vc))
593 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
594}
595
596static void hide_softcursor(struct vc_data *vc)
597{
598 if (softcursor_original != -1) {
599 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
600 if (DO_UPDATE(vc))
601 vc->vc_sw->con_putc(vc, softcursor_original,
602 vc->vc_y, vc->vc_x);
603 softcursor_original = -1;
604 }
605}
606
607static void hide_cursor(struct vc_data *vc)
608{
609 if (vc == sel_cons)
610 clear_selection();
611 vc->vc_sw->con_cursor(vc, CM_ERASE);
612 hide_softcursor(vc);
613}
614
615static void set_cursor(struct vc_data *vc)
616{
617 if (!IS_FG(vc) || console_blanked ||
618 vc->vc_mode == KD_GRAPHICS)
619 return;
620 if (vc->vc_deccm) {
621 if (vc == sel_cons)
622 clear_selection();
623 add_softcursor(vc);
624 if ((vc->vc_cursor_type & 0x0f) != 1)
625 vc->vc_sw->con_cursor(vc, CM_DRAW);
626 } else
627 hide_cursor(vc);
628}
629
630static void set_origin(struct vc_data *vc)
631{
632 WARN_CONSOLE_UNLOCKED();
633
634 if (!CON_IS_VISIBLE(vc) ||
635 !vc->vc_sw->con_set_origin ||
636 !vc->vc_sw->con_set_origin(vc))
637 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
638 vc->vc_visible_origin = vc->vc_origin;
639 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
640 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
641}
642
643static inline void save_screen(struct vc_data *vc)
644{
645 WARN_CONSOLE_UNLOCKED();
646
647 if (vc->vc_sw->con_save_screen)
648 vc->vc_sw->con_save_screen(vc);
649}
650
651/*
652 * Redrawing of screen
653 */
654
655static void clear_buffer_attributes(struct vc_data *vc)
656{
657 unsigned short *p = (unsigned short *)vc->vc_origin;
658 int count = vc->vc_screenbuf_size / 2;
659 int mask = vc->vc_hi_font_mask | 0xff;
660
661 for (; count > 0; count--, p++) {
662 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
663 }
664}
665
666void redraw_screen(struct vc_data *vc, int is_switch)
667{
668 int redraw = 0;
669
670 WARN_CONSOLE_UNLOCKED();
671
672 if (!vc) {
673 /* strange ... */
674 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
675 return;
676 }
677
678 if (is_switch) {
679 struct vc_data *old_vc = vc_cons[fg_console].d;
680 if (old_vc == vc)
681 return;
682 if (!CON_IS_VISIBLE(vc))
683 redraw = 1;
684 *vc->vc_display_fg = vc;
685 fg_console = vc->vc_num;
686 hide_cursor(old_vc);
687 if (!CON_IS_VISIBLE(old_vc)) {
688 save_screen(old_vc);
689 set_origin(old_vc);
690 }
691 } else {
692 hide_cursor(vc);
693 redraw = 1;
694 }
695
696 if (redraw) {
697 int update;
698 int old_was_color = vc->vc_can_do_color;
699
700 set_origin(vc);
701 update = vc->vc_sw->con_switch(vc);
702 set_palette(vc);
703 /*
704 * If console changed from mono<->color, the best we can do
705 * is to clear the buffer attributes. As it currently stands,
706 * rebuilding new attributes from the old buffer is not doable
707 * without overly complex code.
708 */
709 if (old_was_color != vc->vc_can_do_color) {
710 update_attr(vc);
711 clear_buffer_attributes(vc);
712 }
8fd4bd22
JB		 713
714 /* Forcibly update if we're panicing */
715 if ((update && vc->vc_mode != KD_GRAPHICS) ||
716 vt_force_oops_output(vc))
1da177e4
LT		 717 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
718 }
719 set_cursor(vc);
720 if (is_switch) {
721 set_leds();
722 compute_shiftstate();
8182ec49 723 notify_update(vc);
1da177e4
LT		 724 }
725}
726
727/*
728 * Allocation, freeing and resizing of VTs.
729 */
730
731int vc_cons_allocated(unsigned int i)
732{
733 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
734}
735
736static void visual_init(struct vc_data *vc, int num, int init)
737{
738 /* ++Geert: vc->vc_sw->con_init determines console size */
739 if (vc->vc_sw)
740 module_put(vc->vc_sw->owner);
741 vc->vc_sw = conswitchp;
742#ifndef VT_SINGLE_DRIVER
743 if (con_driver_map[num])
744 vc->vc_sw = con_driver_map[num];
745#endif
746 __module_get(vc->vc_sw->owner);
747 vc->vc_num = num;
748 vc->vc_display_fg = &master_display_fg;
749 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
750 vc->vc_uni_pagedir = 0;
751 vc->vc_hi_font_mask = 0;
752 vc->vc_complement_mask = 0;
753 vc->vc_can_do_color = 0;
8fd4bd22 754 vc->vc_panic_force_write = false;
1da177e4
LT		 755 vc->vc_sw->con_init(vc, init);
756 if (!vc->vc_complement_mask)
757 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
758 vc->vc_s_complement_mask = vc->vc_complement_mask;
759 vc->vc_size_row = vc->vc_cols << 1;
760 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
761}
762
763int vc_allocate(unsigned int currcons) /* return 0 on success */
764{
765 WARN_CONSOLE_UNLOCKED();
766
767 if (currcons >= MAX_NR_CONSOLES)
768 return -ENXIO;
769 if (!vc_cons[currcons].d) {
770 struct vc_data *vc;
b293d758 771 struct vt_notifier_param param;
1da177e4
LT		 772
773 /* prevent users from taking too much memory */
774 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
775 return -EPERM;
776
777 /* due to the granularity of kmalloc, we waste some memory here */
778 /* the alloc is done in two steps, to optimize the common situation
779 of a 25x80 console (structsize=216, screenbuf_size=4000) */
780 /* although the numbers above are not valid since long ago, the
781 point is still up-to-date and the comment still has its value
782 even if only as a historical artifact. --mj, July 1998 */
b293d758 783 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 784 if (!vc)
785 return -ENOMEM;
1da177e4 786 vc_cons[currcons].d = vc;
ff917ba4 787 tty_port_init(&vc->port);
c2c88f10 788 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 789 visual_init(vc, currcons, 1);
790 if (!*vc->vc_uni_pagedir_loc)
791 con_set_default_unimap(vc);
5c9228f0 792 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 793 if (!vc->vc_screenbuf) {
794 kfree(vc);
795 vc_cons[currcons].d = NULL;
796 return -ENOMEM;
797 }
f6c06b68
MG		 798
799 /* If no drivers have overridden us and the user didn't pass a
800 boot option, default to displaying the cursor */
801 if (global_cursor_default == -1)
802 global_cursor_default = 1;
803
1da177e4 804 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 805 vcs_make_sysfs(currcons);
b293d758 806 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 807 }
808 return 0;
809}
810
e400b6ec
AD		 811static inline int resize_screen(struct vc_data *vc, int width, int height,
812 int user)
1da177e4
LT		 813{
814 /* Resizes the resolution of the display adapater */
815 int err = 0;
816
817 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 818 err = vc->vc_sw->con_resize(vc, width, height, user);
819
1da177e4
LT		 820 return err;
821}
822
823/*
824 * Change # of rows and columns (0 means unchanged/the size of fg_console)
825 * [this is to be used together with some user program
826 * like resize that changes the hardware videomode]
827 */
828#define VC_RESIZE_MAXCOL (32767)
829#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 830
831/**
832 * vc_do_resize - resizing method for the tty
833 * @tty: tty being resized
834 * @real_tty: real tty (different to tty if a pty/tty pair)
835 * @vc: virtual console private data
836 * @cols: columns
837 * @lines: lines
838 *
839 * Resize a virtual console, clipping according to the actual constraints.
840 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 841 * information and perform any necessary signal handling.
8c9a9dd0
AC		 842 *
843 * Caller must hold the console semaphore. Takes the termios mutex and
844 * ctrl_lock of the tty IFF a tty is passed.
845 */
846
fc6f6238
AC		 847static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
848 unsigned int cols, unsigned int lines)
1da177e4
LT		 849{
850 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 851 unsigned long end;
1da177e4
LT		 852 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
853 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 854 unsigned int user;
1da177e4
LT		 855 unsigned short *newscreen;
856
857 WARN_CONSOLE_UNLOCKED();
858
859 if (!vc)
860 return -ENXIO;
861
e400b6ec
AD		 862 user = vc->vc_resize_user;
863 vc->vc_resize_user = 0;
864
1da177e4
LT		 865 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
866 return -EINVAL;
867
868 new_cols = (cols ? cols : vc->vc_cols);
869 new_rows = (lines ? lines : vc->vc_rows);
870 new_row_size = new_cols << 1;
871 new_screen_size = new_row_size * new_rows;
872
873 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
874 return 0;
875
5cbded58 876 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 877 if (!newscreen)
878 return -ENOMEM;
879
880 old_rows = vc->vc_rows;
881 old_cols = vc->vc_cols;
882 old_row_size = vc->vc_size_row;
883 old_screen_size = vc->vc_screenbuf_size;
884
e400b6ec 885 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 886 if (err) {
887 kfree(newscreen);
888 return err;
889 }
890
891 vc->vc_rows = new_rows;
892 vc->vc_cols = new_cols;
893 vc->vc_size_row = new_row_size;
894 vc->vc_screenbuf_size = new_screen_size;
895
896 rlth = min(old_row_size, new_row_size);
897 rrem = new_row_size - rlth;
898 old_origin = vc->vc_origin;
899 new_origin = (long) newscreen;
900 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 901
902 if (vc->vc_y > new_rows) {
903 if (old_rows - vc->vc_y < new_rows) {
904 /*
905 * Cursor near the bottom, copy contents from the
906 * bottom of buffer
907 */
908 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 909 } else {
910 /*
911 * Cursor is in no man's land, copy 1/2 screenful
912 * from the top and bottom of cursor position
913 */
914 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 915 }
9fc2b2d0
FJ		 916 }
917
918 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 919
920 update_attr(vc);
921
3b41dc1a
AD		 922 while (old_origin < end) {
923 scr_memcpyw((unsigned short *) new_origin,
924 (unsigned short *) old_origin, rlth);
1da177e4 925 if (rrem)
3b41dc1a
AD		 926 scr_memsetw((void *)(new_origin + rlth),
927 vc->vc_video_erase_char, rrem);
1da177e4
LT		 928 old_origin += old_row_size;
929 new_origin += new_row_size;
930 }
931 if (new_scr_end > new_origin)
3b41dc1a
AD		 932 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
933 new_scr_end - new_origin);
5c9228f0 934 kfree(vc->vc_screenbuf);
1da177e4 935 vc->vc_screenbuf = newscreen;
1da177e4
LT		 936 vc->vc_screenbuf_size = new_screen_size;
937 set_origin(vc);
938
939 /* do part of a reset_terminal() */
940 vc->vc_top = 0;
941 vc->vc_bottom = vc->vc_rows;
942 gotoxy(vc, vc->vc_x, vc->vc_y);
943 save_cur(vc);
944
8c9a9dd0
AC		 945 if (tty) {
946 /* Rewrite the requested winsize data with the actual
947 resulting sizes */
948 struct winsize ws;
1da177e4
LT		 949 memset(&ws, 0, sizeof(ws));
950 ws.ws_row = vc->vc_rows;
951 ws.ws_col = vc->vc_cols;
952 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 953 tty_do_resize(tty, &ws);
1da177e4
LT		 954 }
955
956 if (CON_IS_VISIBLE(vc))
957 update_screen(vc);
8b92e87d 958 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 959 return err;
960}
961
8c9a9dd0
AC		 962/**
963 * vc_resize - resize a VT
964 * @vc: virtual console
965 * @cols: columns
966 * @rows: rows
967 *
968 * Resize a virtual console as seen from the console end of things. We
969 * use the common vc_do_resize methods to update the structures. The
970 * caller must hold the console sem to protect console internals and
8ce73264 971 * vc->port.tty
8c9a9dd0
AC		 972 */
973
974int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
975{
8ce73264 976 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 977}
978
979/**
980 * vt_resize - resize a VT
981 * @tty: tty to resize
8c9a9dd0
AC		 982 * @ws: winsize attributes
983 *
984 * Resize a virtual terminal. This is called by the tty layer as we
985 * register our own handler for resizing. The mutual helper does all
986 * the actual work.
987 *
988 * Takes the console sem and the called methods then take the tty
989 * termios_mutex and the tty ctrl_lock in that order.
990 */
da2bdf9a 991static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 992{
8c9a9dd0
AC		 993 struct vc_data *vc = tty->driver_data;
994 int ret;
ca9bda00
AC		 995
996 acquire_console_sem();
fc6f6238 997 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ca9bda00 998 release_console_sem();
8c9a9dd0 999 return ret;
ca9bda00 1000}
1da177e4 1001
ca9bda00 1002void vc_deallocate(unsigned int currcons)
1da177e4
LT		 1003{
1004 WARN_CONSOLE_UNLOCKED();
1005
1006 if (vc_cons_allocated(currcons)) {
1007 struct vc_data *vc = vc_cons[currcons].d;
b293d758 1008 struct vt_notifier_param param = { .vc = vc };
4995f8ef 1009
b293d758 1010 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1011 vcs_remove_sysfs(currcons);
1da177e4 1012 vc->vc_sw->con_deinit(vc);
bde0d2c9 1013 put_pid(vc->vt_pid);
d459ec0b 1014 module_put(vc->vc_sw->owner);
5c9228f0 1015 kfree(vc->vc_screenbuf);
1da177e4
LT		 1016 if (currcons >= MIN_NR_CONSOLES)
1017 kfree(vc);
1018 vc_cons[currcons].d = NULL;
1019 }
1020}
1021
1022/*
1023 * VT102 emulator
1024 */
1025
1026#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1027#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1028#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1029
1030#define decarm VC_REPEAT
1031#define decckm VC_CKMODE
1032#define kbdapplic VC_APPLIC
1033#define lnm VC_CRLF
1034
1035/*
1036 * this is what the terminal answers to a ESC-Z or csi0c query.
1037 */
1038#define VT100ID "\033[?1;2c"
1039#define VT102ID "\033[?6c"
1040
1041unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1042 8,12,10,14, 9,13,11,15 };
1043
1044/* the default colour table, for VGA+ colour systems */
1045int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1046 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1047int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1048 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1049int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1050 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1051
1c2bbe6a
JE		 1052module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1053module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1054module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1055
1da177e4
LT		 1056/*
1057 * gotoxy() must verify all boundaries, because the arguments
1058 * might also be negative. If the given position is out of
1059 * bounds, the cursor is placed at the nearest margin.
1060 */
1061static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1062{
1063 int min_y, max_y;
1064
1065 if (new_x < 0)
1066 vc->vc_x = 0;
1067 else {
1068 if (new_x >= vc->vc_cols)
1069 vc->vc_x = vc->vc_cols - 1;
1070 else
1071 vc->vc_x = new_x;
1072 }
1073
1074 if (vc->vc_decom) {
1075 min_y = vc->vc_top;
1076 max_y = vc->vc_bottom;
1077 } else {
1078 min_y = 0;
1079 max_y = vc->vc_rows;
1080 }
1081 if (new_y < min_y)
1082 vc->vc_y = min_y;
1083 else if (new_y >= max_y)
1084 vc->vc_y = max_y - 1;
1085 else
1086 vc->vc_y = new_y;
1087 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1088 vc->vc_need_wrap = 0;
1089}
1090
1091/* for absolute user moves, when decom is set */
1092static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1093{
1094 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1095}
1096
1097void scrollback(struct vc_data *vc, int lines)
1098{
1099 if (!lines)
1100 lines = vc->vc_rows / 2;
1101 scrolldelta(-lines);
1102}
1103
1104void scrollfront(struct vc_data *vc, int lines)
1105{
1106 if (!lines)
1107 lines = vc->vc_rows / 2;
1108 scrolldelta(lines);
1109}
1110
1111static void lf(struct vc_data *vc)
1112{
1113 /* don't scroll if above bottom of scrolling region, or
1114 * if below scrolling region
1115 */
1116 if (vc->vc_y + 1 == vc->vc_bottom)
1117 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1118 else if (vc->vc_y < vc->vc_rows - 1) {
1119 vc->vc_y++;
1120 vc->vc_pos += vc->vc_size_row;
1121 }
1122 vc->vc_need_wrap = 0;
b293d758 1123 notify_write(vc, '\n');
1da177e4
LT		 1124}
1125
1126static void ri(struct vc_data *vc)
1127{
1128 /* don't scroll if below top of scrolling region, or
1129 * if above scrolling region
1130 */
1131 if (vc->vc_y == vc->vc_top)
1132 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1133 else if (vc->vc_y > 0) {
1134 vc->vc_y--;
1135 vc->vc_pos -= vc->vc_size_row;
1136 }
1137 vc->vc_need_wrap = 0;
1138}
1139
1140static inline void cr(struct vc_data *vc)
1141{
1142 vc->vc_pos -= vc->vc_x << 1;
1143 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1144 notify_write(vc, '\r');
1da177e4
LT		 1145}
1146
1147static inline void bs(struct vc_data *vc)
1148{
1149 if (vc->vc_x) {
1150 vc->vc_pos -= 2;
1151 vc->vc_x--;
1152 vc->vc_need_wrap = 0;
b293d758 1153 notify_write(vc, '\b');
1da177e4
LT		 1154 }
1155}
1156
1157static inline void del(struct vc_data *vc)
1158{
1159 /* ignored */
1160}
1161
1162static void csi_J(struct vc_data *vc, int vpar)
1163{
1164 unsigned int count;
1165 unsigned short * start;
1166
1167 switch (vpar) {
1168 case 0: /* erase from cursor to end of display */
1169 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1170 start = (unsigned short *)vc->vc_pos;
1171 if (DO_UPDATE(vc)) {
1172 /* do in two stages */
1173 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1174 vc->vc_cols - vc->vc_x);
1175 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1176 vc->vc_rows - vc->vc_y - 1,
1177 vc->vc_cols);
1178 }
1179 break;
1180 case 1: /* erase from start to cursor */
1181 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1182 start = (unsigned short *)vc->vc_origin;
1183 if (DO_UPDATE(vc)) {
1184 /* do in two stages */
1185 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1186 vc->vc_cols);
1187 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1188 vc->vc_x + 1);
1189 }
1190 break;
1191 case 2: /* erase whole display */
1192 count = vc->vc_cols * vc->vc_rows;
1193 start = (unsigned short *)vc->vc_origin;
1194 if (DO_UPDATE(vc))
1195 vc->vc_sw->con_clear(vc, 0, 0,
1196 vc->vc_rows,
1197 vc->vc_cols);
1198 break;
1199 default:
1200 return;
1201 }
1202 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1203 vc->vc_need_wrap = 0;
1204}
1205
1206static void csi_K(struct vc_data *vc, int vpar)
1207{
1208 unsigned int count;
1209 unsigned short * start;
1210
1211 switch (vpar) {
1212 case 0: /* erase from cursor to end of line */
1213 count = vc->vc_cols - vc->vc_x;
1214 start = (unsigned short *)vc->vc_pos;
1215 if (DO_UPDATE(vc))
1216 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1217 vc->vc_cols - vc->vc_x);
1218 break;
1219 case 1: /* erase from start of line to cursor */
1220 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1221 count = vc->vc_x + 1;
1222 if (DO_UPDATE(vc))
1223 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1224 vc->vc_x + 1);
1225 break;
1226 case 2: /* erase whole line */
1227 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1228 count = vc->vc_cols;
1229 if (DO_UPDATE(vc))
1230 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1231 vc->vc_cols);
1232 break;
1233 default:
1234 return;
1235 }
1236 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1237 vc->vc_need_wrap = 0;
1238}
1239
1240static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1241{ /* not vt100? */
1242 int count;
1243
1244 if (!vpar)
1245 vpar++;
1246 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1247
1248 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1249 if (DO_UPDATE(vc))
1250 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1251 vc->vc_need_wrap = 0;
1252}
1253
1254static void default_attr(struct vc_data *vc)
1255{
1256 vc->vc_intensity = 1;
fa6ce9ab 1257 vc->vc_italic = 0;
1da177e4
LT		 1258 vc->vc_underline = 0;
1259 vc->vc_reverse = 0;
1260 vc->vc_blink = 0;
1261 vc->vc_color = vc->vc_def_color;
1262}
1263
1264/* console_sem is held */
1265static void csi_m(struct vc_data *vc)
1266{
1267 int i;
1268
1269 for (i = 0; i <= vc->vc_npar; i++)
1270 switch (vc->vc_par[i]) {
1271 case 0: /* all attributes off */
1272 default_attr(vc);
1273 break;
1274 case 1:
1275 vc->vc_intensity = 2;
1276 break;
1277 case 2:
1278 vc->vc_intensity = 0;
1279 break;
fa6ce9ab
JE		 1280 case 3:
1281 vc->vc_italic = 1;
1282 break;
1da177e4
LT		 1283 case 4:
1284 vc->vc_underline = 1;
1285 break;
1286 case 5:
1287 vc->vc_blink = 1;
1288 break;
1289 case 7:
1290 vc->vc_reverse = 1;
1291 break;
1292 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1293 * Select primary font, don't display
1294 * control chars if defined, don't set
1295 * bit 8 on output.
1296 */
1297 vc->vc_translate = set_translate(vc->vc_charset == 0
1298 ? vc->vc_G0_charset
1299 : vc->vc_G1_charset, vc);
1300 vc->vc_disp_ctrl = 0;
1301 vc->vc_toggle_meta = 0;
1302 break;
1303 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1304 * Select first alternate font, lets
1305 * chars < 32 be displayed as ROM chars.
1306 */
1307 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1308 vc->vc_disp_ctrl = 1;
1309 vc->vc_toggle_meta = 0;
1310 break;
1311 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1312 * Select second alternate font, toggle
1313 * high bit before displaying as ROM char.
1314 */
1315 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1316 vc->vc_disp_ctrl = 1;
1317 vc->vc_toggle_meta = 1;
1318 break;
1319 case 21:
1320 case 22:
1321 vc->vc_intensity = 1;
1322 break;
fa6ce9ab
JE		 1323 case 23:
1324 vc->vc_italic = 0;
1325 break;
1da177e4
LT		 1326 case 24:
1327 vc->vc_underline = 0;
1328 break;
1329 case 25:
1330 vc->vc_blink = 0;
1331 break;
1332 case 27:
1333 vc->vc_reverse = 0;
1334 break;
1335 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1336 * Enables underscore, white foreground
1337 * with white underscore (Linux - use
1338 * default foreground).
1339 */
1340 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1341 vc->vc_underline = 1;
1342 break;
1343 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1344 * Disable underline option.
1345 * Reset colour to default? It did this
1346 * before...
1347 */
1348 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1349 vc->vc_underline = 0;
1350 break;
1351 case 49:
1352 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1353 break;
1354 default:
1355 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1356 vc->vc_color = color_table[vc->vc_par[i] - 30]
1357 | (vc->vc_color & 0xf0);
1358 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1359 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1360 | (vc->vc_color & 0x0f);
1361 break;
1362 }
1363 update_attr(vc);
1364}
1365
1366static void respond_string(const char *p, struct tty_struct *tty)
1367{
1368 while (*p) {
1369 tty_insert_flip_char(tty, *p, 0);
1370 p++;
1371 }
1372 con_schedule_flip(tty);
1373}
1374
1375static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1376{
1377 char buf[40];
1378
1379 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1380 respond_string(buf, tty);
1381}
1382
1383static inline void status_report(struct tty_struct *tty)
1384{
1385 respond_string("\033[0n", tty); /* Terminal ok */
1386}
1387
1388static inline void respond_ID(struct tty_struct * tty)
1389{
1390 respond_string(VT102ID, tty);
1391}
1392
1393void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1394{
1395 char buf[8];
1396
1397 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1398 (char)('!' + mry));
1399 respond_string(buf, tty);
1400}
1401
1402/* invoked via ioctl(TIOCLINUX) and through set_selection */
1403int mouse_reporting(void)
1404{
1405 return vc_cons[fg_console].d->vc_report_mouse;
1406}
1407
1408/* console_sem is held */
1409static void set_mode(struct vc_data *vc, int on_off)
1410{
1411 int i;
1412
1413 for (i = 0; i <= vc->vc_npar; i++)
1414 if (vc->vc_ques) {
1415 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1416 case 1: /* Cursor keys send ^[Ox/^[[x */
1417 if (on_off)
1418 set_kbd(vc, decckm);
1419 else
1420 clr_kbd(vc, decckm);
1421 break;
1422 case 3: /* 80/132 mode switch unimplemented */
1423 vc->vc_deccolm = on_off;
1424#if 0
1425 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1426 /* this alone does not suffice; some user mode
1427 utility has to change the hardware regs */
1428#endif
1429 break;
1430 case 5: /* Inverted screen on/off */
1431 if (vc->vc_decscnm != on_off) {
1432 vc->vc_decscnm = on_off;
1433 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1434 update_attr(vc);
1435 }
1436 break;
1437 case 6: /* Origin relative/absolute */
1438 vc->vc_decom = on_off;
1439 gotoxay(vc, 0, 0);
1440 break;
1441 case 7: /* Autowrap on/off */
1442 vc->vc_decawm = on_off;
1443 break;
1444 case 8: /* Autorepeat on/off */
1445 if (on_off)
1446 set_kbd(vc, decarm);
1447 else
1448 clr_kbd(vc, decarm);
1449 break;
1450 case 9:
1451 vc->vc_report_mouse = on_off ? 1 : 0;
1452 break;
1453 case 25: /* Cursor on/off */
1454 vc->vc_deccm = on_off;
1455 break;
1456 case 1000:
1457 vc->vc_report_mouse = on_off ? 2 : 0;
1458 break;
1459 }
1460 } else {
1461 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1462 case 3: /* Monitor (display ctrls) */
1463 vc->vc_disp_ctrl = on_off;
1464 break;
1465 case 4: /* Insert Mode on/off */
1466 vc->vc_decim = on_off;
1467 break;
1468 case 20: /* Lf, Enter == CrLf/Lf */
1469 if (on_off)
1470 set_kbd(vc, lnm);
1471 else
1472 clr_kbd(vc, lnm);
1473 break;
1474 }
1475 }
1476}
1477
1478/* console_sem is held */
1479static void setterm_command(struct vc_data *vc)
1480{
1481 switch(vc->vc_par[0]) {
1482 case 1: /* set color for underline mode */
1483 if (vc->vc_can_do_color &&
1484 vc->vc_par[1] < 16) {
1485 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1486 if (vc->vc_underline)
1487 update_attr(vc);
1488 }
1489 break;
1490 case 2: /* set color for half intensity mode */
1491 if (vc->vc_can_do_color &&
1492 vc->vc_par[1] < 16) {
1493 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1494 if (vc->vc_intensity == 0)
1495 update_attr(vc);
1496 }
1497 break;
1498 case 8: /* store colors as defaults */
1499 vc->vc_def_color = vc->vc_attr;
1500 if (vc->vc_hi_font_mask == 0x100)
1501 vc->vc_def_color >>= 1;
1502 default_attr(vc);
1503 update_attr(vc);
1504 break;
1505 case 9: /* set blanking interval */
f324edc8 1506 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1507 poke_blanked_console();
1508 break;
1509 case 10: /* set bell frequency in Hz */
1510 if (vc->vc_npar >= 1)
1511 vc->vc_bell_pitch = vc->vc_par[1];
1512 else
1513 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1514 break;
1515 case 11: /* set bell duration in msec */
1516 if (vc->vc_npar >= 1)
1517 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1518 vc->vc_par[1] * HZ / 1000 : 0;
1519 else
1520 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1521 break;
1522 case 12: /* bring specified console to the front */
1523 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1524 set_console(vc->vc_par[1] - 1);
1525 break;
1526 case 13: /* unblank the screen */
1527 poke_blanked_console();
1528 break;
1529 case 14: /* set vesa powerdown interval */
1530 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1531 break;
1532 case 15: /* activate the previous console */
1533 set_console(last_console);
1534 break;
1535 }
1536}
1537
1538/* console_sem is held */
1539static void csi_at(struct vc_data *vc, unsigned int nr)
1540{
1541 if (nr > vc->vc_cols - vc->vc_x)
1542 nr = vc->vc_cols - vc->vc_x;
1543 else if (!nr)
1544 nr = 1;
1545 insert_char(vc, nr);
1546}
1547
1548/* console_sem is held */
1549static void csi_L(struct vc_data *vc, unsigned int nr)
1550{
1551 if (nr > vc->vc_rows - vc->vc_y)
1552 nr = vc->vc_rows - vc->vc_y;
1553 else if (!nr)
1554 nr = 1;
1555 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1556 vc->vc_need_wrap = 0;
1557}
1558
1559/* console_sem is held */
1560static void csi_P(struct vc_data *vc, unsigned int nr)
1561{
1562 if (nr > vc->vc_cols - vc->vc_x)
1563 nr = vc->vc_cols - vc->vc_x;
1564 else if (!nr)
1565 nr = 1;
1566 delete_char(vc, nr);
1567}
1568
1569/* console_sem is held */
1570static void csi_M(struct vc_data *vc, unsigned int nr)
1571{
1572 if (nr > vc->vc_rows - vc->vc_y)
1573 nr = vc->vc_rows - vc->vc_y;
1574 else if (!nr)
1575 nr=1;
1576 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1577 vc->vc_need_wrap = 0;
1578}
1579
1580/* console_sem is held (except via vc_init->reset_terminal */
1581static void save_cur(struct vc_data *vc)
1582{
1583 vc->vc_saved_x = vc->vc_x;
1584 vc->vc_saved_y = vc->vc_y;
1585 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1586 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1587 vc->vc_s_underline = vc->vc_underline;
1588 vc->vc_s_blink = vc->vc_blink;
1589 vc->vc_s_reverse = vc->vc_reverse;
1590 vc->vc_s_charset = vc->vc_charset;
1591 vc->vc_s_color = vc->vc_color;
1592 vc->vc_saved_G0 = vc->vc_G0_charset;
1593 vc->vc_saved_G1 = vc->vc_G1_charset;
1594}
1595
1596/* console_sem is held */
1597static void restore_cur(struct vc_data *vc)
1598{
1599 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1600 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1601 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1602 vc->vc_underline = vc->vc_s_underline;
1603 vc->vc_blink = vc->vc_s_blink;
1604 vc->vc_reverse = vc->vc_s_reverse;
1605 vc->vc_charset = vc->vc_s_charset;
1606 vc->vc_color = vc->vc_s_color;
1607 vc->vc_G0_charset = vc->vc_saved_G0;
1608 vc->vc_G1_charset = vc->vc_saved_G1;
1609 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1610 update_attr(vc);
1611 vc->vc_need_wrap = 0;
1612}
1613
1614enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1615 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1616 ESpalette };
1617
1618/* console_sem is held (except via vc_init()) */
1619static void reset_terminal(struct vc_data *vc, int do_clear)
1620{
1621 vc->vc_top = 0;
1622 vc->vc_bottom = vc->vc_rows;
1623 vc->vc_state = ESnormal;
1624 vc->vc_ques = 0;
1625 vc->vc_translate = set_translate(LAT1_MAP, vc);
1626 vc->vc_G0_charset = LAT1_MAP;
1627 vc->vc_G1_charset = GRAF_MAP;
1628 vc->vc_charset = 0;
1629 vc->vc_need_wrap = 0;
1630 vc->vc_report_mouse = 0;
042f10ec 1631 vc->vc_utf = default_utf8;
1da177e4
LT		 1632 vc->vc_utf_count = 0;
1633
1634 vc->vc_disp_ctrl = 0;
1635 vc->vc_toggle_meta = 0;
1636
1637 vc->vc_decscnm = 0;
1638 vc->vc_decom = 0;
1639 vc->vc_decawm = 1;
f6c06b68 1640 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1641 vc->vc_decim = 0;
1642
1643 set_kbd(vc, decarm);
1644 clr_kbd(vc, decckm);
1645 clr_kbd(vc, kbdapplic);
1646 clr_kbd(vc, lnm);
1647 kbd_table[vc->vc_num].lockstate = 0;
1648 kbd_table[vc->vc_num].slockstate = 0;
1649 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1650 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1651 /* do not do set_leds here because this causes an endless tasklet loop
1652 when the keyboard hasn't been initialized yet */
1653
9ea9a886 1654 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1655 vc->vc_complement_mask = vc->vc_s_complement_mask;
1656
1657 default_attr(vc);
1658 update_attr(vc);
1659
1660 vc->vc_tab_stop[0] = 0x01010100;
1661 vc->vc_tab_stop[1] =
1662 vc->vc_tab_stop[2] =
1663 vc->vc_tab_stop[3] =
a564738c
WK		 1664 vc->vc_tab_stop[4] =
1665 vc->vc_tab_stop[5] =
1666 vc->vc_tab_stop[6] =
1667 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1668
1669 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1670 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1671
1672 gotoxy(vc, 0, 0);
1673 save_cur(vc);
1674 if (do_clear)
1675 csi_J(vc, 2);
1676}
1677
1678/* console_sem is held */
1679static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1680{
1681 /*
1682 * Control characters can be used in the _middle_
1683 * of an escape sequence.
1684 */
1685 switch (c) {
1686 case 0:
1687 return;
1688 case 7:
1689 if (vc->vc_bell_duration)
1690 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1691 return;
1692 case 8:
1693 bs(vc);
1694 return;
1695 case 9:
1696 vc->vc_pos -= (vc->vc_x << 1);
1697 while (vc->vc_x < vc->vc_cols - 1) {
1698 vc->vc_x++;
1699 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1700 break;
1701 }
1702 vc->vc_pos += (vc->vc_x << 1);
b293d758 1703 notify_write(vc, '\t');
1da177e4
LT		 1704 return;
1705 case 10: case 11: case 12:
1706 lf(vc);
1707 if (!is_kbd(vc, lnm))
1708 return;
1709 case 13:
1710 cr(vc);
1711 return;
1712 case 14:
1713 vc->vc_charset = 1;
1714 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1715 vc->vc_disp_ctrl = 1;
1716 return;
1717 case 15:
1718 vc->vc_charset = 0;
1719 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1720 vc->vc_disp_ctrl = 0;
1721 return;
1722 case 24: case 26:
1723 vc->vc_state = ESnormal;
1724 return;
1725 case 27:
1726 vc->vc_state = ESesc;
1727 return;
1728 case 127:
1729 del(vc);
1730 return;
1731 case 128+27:
1732 vc->vc_state = ESsquare;
1733 return;
1734 }
1735 switch(vc->vc_state) {
1736 case ESesc:
1737 vc->vc_state = ESnormal;
1738 switch (c) {
1739 case '[':
1740 vc->vc_state = ESsquare;
1741 return;
1742 case ']':
1743 vc->vc_state = ESnonstd;
1744 return;
1745 case '%':
1746 vc->vc_state = ESpercent;
1747 return;
1748 case 'E':
1749 cr(vc);
1750 lf(vc);
1751 return;
1752 case 'M':
1753 ri(vc);
1754 return;
1755 case 'D':
1756 lf(vc);
1757 return;
1758 case 'H':
1759 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1760 return;
1761 case 'Z':
1762 respond_ID(tty);
1763 return;
1764 case '7':
1765 save_cur(vc);
1766 return;
1767 case '8':
1768 restore_cur(vc);
1769 return;
1770 case '(':
1771 vc->vc_state = ESsetG0;
1772 return;
1773 case ')':
1774 vc->vc_state = ESsetG1;
1775 return;
1776 case '#':
1777 vc->vc_state = EShash;
1778 return;
1779 case 'c':
1780 reset_terminal(vc, 1);
1781 return;
1782 case '>': /* Numeric keypad */
1783 clr_kbd(vc, kbdapplic);
1784 return;
1785 case '=': /* Appl. keypad */
1786 set_kbd(vc, kbdapplic);
1787 return;
1788 }
1789 return;
1790 case ESnonstd:
1791 if (c=='P') { /* palette escape sequence */
1792 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1793 vc->vc_par[vc->vc_npar] = 0;
1794 vc->vc_npar = 0;
1795 vc->vc_state = ESpalette;
1796 return;
1797 } else if (c=='R') { /* reset palette */
1798 reset_palette(vc);
1799 vc->vc_state = ESnormal;
1800 } else
1801 vc->vc_state = ESnormal;
1802 return;
1803 case ESpalette:
74c807ce
AS		 1804 if (isxdigit(c)) {
1805 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1806 if (vc->vc_npar == 7) {
1807 int i = vc->vc_par[0] * 3, j = 1;
1808 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1809 vc->vc_palette[i++] += vc->vc_par[j++];
1810 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1811 vc->vc_palette[i++] += vc->vc_par[j++];
1812 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1813 vc->vc_palette[i] += vc->vc_par[j];
1814 set_palette(vc);
1815 vc->vc_state = ESnormal;
1816 }
1817 } else
1818 vc->vc_state = ESnormal;
1819 return;
1820 case ESsquare:
1821 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1822 vc->vc_par[vc->vc_npar] = 0;
1823 vc->vc_npar = 0;
1824 vc->vc_state = ESgetpars;
1825 if (c == '[') { /* Function key */
1826 vc->vc_state=ESfunckey;
1827 return;
1828 }
1829 vc->vc_ques = (c == '?');
1830 if (vc->vc_ques)
1831 return;
1832 case ESgetpars:
1833 if (c == ';' && vc->vc_npar < NPAR - 1) {
1834 vc->vc_npar++;
1835 return;
1836 } else if (c>='0' && c<='9') {
1837 vc->vc_par[vc->vc_npar] *= 10;
1838 vc->vc_par[vc->vc_npar] += c - '0';
1839 return;
1840 } else
1841 vc->vc_state = ESgotpars;
1842 case ESgotpars:
1843 vc->vc_state = ESnormal;
1844 switch(c) {
1845 case 'h':
1846 set_mode(vc, 1);
1847 return;
1848 case 'l':
1849 set_mode(vc, 0);
1850 return;
1851 case 'c':
1852 if (vc->vc_ques) {
1853 if (vc->vc_par[0])
1854 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1855 else
9ea9a886 1856 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1857 return;
1858 }
1859 break;
1860 case 'm':
1861 if (vc->vc_ques) {
1862 clear_selection();
1863 if (vc->vc_par[0])
1864 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1865 else
1866 vc->vc_complement_mask = vc->vc_s_complement_mask;
1867 return;
1868 }
1869 break;
1870 case 'n':
1871 if (!vc->vc_ques) {
1872 if (vc->vc_par[0] == 5)
1873 status_report(tty);
1874 else if (vc->vc_par[0] == 6)
1875 cursor_report(vc, tty);
1876 }
1877 return;
1878 }
1879 if (vc->vc_ques) {
1880 vc->vc_ques = 0;
1881 return;
1882 }
1883 switch(c) {
1884 case 'G': case '`':
1885 if (vc->vc_par[0])
1886 vc->vc_par[0]--;
1887 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1888 return;
1889 case 'A':
1890 if (!vc->vc_par[0])
1891 vc->vc_par[0]++;
1892 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1893 return;
1894 case 'B': case 'e':
1895 if (!vc->vc_par[0])
1896 vc->vc_par[0]++;
1897 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1898 return;
1899 case 'C': case 'a':
1900 if (!vc->vc_par[0])
1901 vc->vc_par[0]++;
1902 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1903 return;
1904 case 'D':
1905 if (!vc->vc_par[0])
1906 vc->vc_par[0]++;
1907 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1908 return;
1909 case 'E':
1910 if (!vc->vc_par[0])
1911 vc->vc_par[0]++;
1912 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1913 return;
1914 case 'F':
1915 if (!vc->vc_par[0])
1916 vc->vc_par[0]++;
1917 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1918 return;
1919 case 'd':
1920 if (vc->vc_par[0])
1921 vc->vc_par[0]--;
1922 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1923 return;
1924 case 'H': case 'f':
1925 if (vc->vc_par[0])
1926 vc->vc_par[0]--;
1927 if (vc->vc_par[1])
1928 vc->vc_par[1]--;
1929 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1930 return;
1931 case 'J':
1932 csi_J(vc, vc->vc_par[0]);
1933 return;
1934 case 'K':
1935 csi_K(vc, vc->vc_par[0]);
1936 return;
1937 case 'L':
1938 csi_L(vc, vc->vc_par[0]);
1939 return;
1940 case 'M':
1941 csi_M(vc, vc->vc_par[0]);
1942 return;
1943 case 'P':
1944 csi_P(vc, vc->vc_par[0]);
1945 return;
1946 case 'c':
1947 if (!vc->vc_par[0])
1948 respond_ID(tty);
1949 return;
1950 case 'g':
1951 if (!vc->vc_par[0])
1952 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1953 else if (vc->vc_par[0] == 3) {
1954 vc->vc_tab_stop[0] =
1955 vc->vc_tab_stop[1] =
1956 vc->vc_tab_stop[2] =
1957 vc->vc_tab_stop[3] =
a564738c
WK		 1958 vc->vc_tab_stop[4] =
1959 vc->vc_tab_stop[5] =
1960 vc->vc_tab_stop[6] =
1961 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1962 }
1963 return;
1964 case 'm':
1965 csi_m(vc);
1966 return;
1967 case 'q': /* DECLL - but only 3 leds */
1968 /* map 0,1,2,3 to 0,1,2,4 */
1969 if (vc->vc_par[0] < 4)
1970 setledstate(kbd_table + vc->vc_num,
1971 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1972 return;
1973 case 'r':
1974 if (!vc->vc_par[0])
1975 vc->vc_par[0]++;
1976 if (!vc->vc_par[1])
1977 vc->vc_par[1] = vc->vc_rows;
1978 /* Minimum allowed region is 2 lines */
1979 if (vc->vc_par[0] < vc->vc_par[1] &&
1980 vc->vc_par[1] <= vc->vc_rows) {
1981 vc->vc_top = vc->vc_par[0] - 1;
1982 vc->vc_bottom = vc->vc_par[1];
1983 gotoxay(vc, 0, 0);
1984 }
1985 return;
1986 case 's':
1987 save_cur(vc);
1988 return;
1989 case 'u':
1990 restore_cur(vc);
1991 return;
1992 case 'X':
1993 csi_X(vc, vc->vc_par[0]);
1994 return;
1995 case '@':
1996 csi_at(vc, vc->vc_par[0]);
1997 return;
1998 case ']': /* setterm functions */
1999 setterm_command(vc);
2000 return;
2001 }
2002 return;
2003 case ESpercent:
2004 vc->vc_state = ESnormal;
2005 switch (c) {
2006 case '@': /* defined in ISO 2022 */
2007 vc->vc_utf = 0;
2008 return;
2009 case 'G': /* prelim official escape code */
2010 case '8': /* retained for compatibility */
2011 vc->vc_utf = 1;
2012 return;
2013 }
2014 return;
2015 case ESfunckey:
2016 vc->vc_state = ESnormal;
2017 return;
2018 case EShash:
2019 vc->vc_state = ESnormal;
2020 if (c == '8') {
2021 /* DEC screen alignment test. kludge :-) */
2022 vc->vc_video_erase_char =
2023 (vc->vc_video_erase_char & 0xff00) | 'E';
2024 csi_J(vc, 2);
2025 vc->vc_video_erase_char =
2026 (vc->vc_video_erase_char & 0xff00) | ' ';
2027 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2028 }
2029 return;
2030 case ESsetG0:
2031 if (c == '0')
2032 vc->vc_G0_charset = GRAF_MAP;
2033 else if (c == 'B')
2034 vc->vc_G0_charset = LAT1_MAP;
2035 else if (c == 'U')
2036 vc->vc_G0_charset = IBMPC_MAP;
2037 else if (c == 'K')
2038 vc->vc_G0_charset = USER_MAP;
2039 if (vc->vc_charset == 0)
2040 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2041 vc->vc_state = ESnormal;
2042 return;
2043 case ESsetG1:
2044 if (c == '0')
2045 vc->vc_G1_charset = GRAF_MAP;
2046 else if (c == 'B')
2047 vc->vc_G1_charset = LAT1_MAP;
2048 else if (c == 'U')
2049 vc->vc_G1_charset = IBMPC_MAP;
2050 else if (c == 'K')
2051 vc->vc_G1_charset = USER_MAP;
2052 if (vc->vc_charset == 1)
2053 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2054 vc->vc_state = ESnormal;
2055 return;
2056 default:
2057 vc->vc_state = ESnormal;
2058 }
2059}
2060
2061/* This is a temporary buffer used to prepare a tty console write
2062 * so that we can easily avoid touching user space while holding the
2063 * console spinlock. It is allocated in con_init and is shared by
2064 * this code and the vc_screen read/write tty calls.
2065 *
2066 * We have to allocate this statically in the kernel data section
2067 * since console_init (and thus con_init) are called before any
2068 * kernel memory allocation is available.
2069 */
2070char con_buf[CON_BUF_SIZE];
c831c338 2071DEFINE_MUTEX(con_buf_mtx);
1da177e4 2072
2f1a2ccb 2073/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2074 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2075 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2076 */
2077struct interval {
2078 uint32_t first;
2079 uint32_t last;
2080};
2081
2082static int bisearch(uint32_t ucs, const struct interval *table, int max)
2083{
2084 int min = 0;
2085 int mid;
2086
2087 if (ucs < table[0].first || ucs > table[max].last)
2088 return 0;
2089 while (max >= min) {
2090 mid = (min + max) / 2;
2091 if (ucs > table[mid].last)
2092 min = mid + 1;
2093 else if (ucs < table[mid].first)
2094 max = mid - 1;
2095 else
2096 return 1;
2097 }
2098 return 0;
2099}
2100
2101static int is_double_width(uint32_t ucs)
2102{
2103 static const struct interval double_width[] = {
2104 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2105 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2106 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2107 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2108 };
0f11541b 2109 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2110}
2111
1da177e4
LT		 2112/* acquires console_sem */
2113static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2114{
2115#ifdef VT_BUF_VRAM_ONLY
2116#define FLUSH do { } while(0);
2117#else
2118#define FLUSH if (draw_x >= 0) { \
2119 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2120 draw_x = -1; \
2121 }
2122#endif
2123
2124 int c, tc, ok, n = 0, draw_x = -1;
2125 unsigned int currcons;
2126 unsigned long draw_from = 0, draw_to = 0;
2127 struct vc_data *vc;
2f1a2ccb 2128 unsigned char vc_attr;
0341a4d0 2129 struct vt_notifier_param param;
2f1a2ccb
EK		 2130 uint8_t rescan;
2131 uint8_t inverse;
2132 uint8_t width;
1da177e4 2133 u16 himask, charmask;
1da177e4
LT		 2134
2135 if (in_interrupt())
2136 return count;
2137
2138 might_sleep();
2139
2140 acquire_console_sem();
2141 vc = tty->driver_data;
2142 if (vc == NULL) {
2143 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2144 release_console_sem();
2145 return 0;
2146 }
2147
2148 currcons = vc->vc_num;
2149 if (!vc_cons_allocated(currcons)) {
2150 /* could this happen? */
9074d963 2151 printk_once("con_write: tty %d not allocated\n", currcons+1);
1da177e4
LT		 2152 release_console_sem();
2153 return 0;
2154 }
1da177e4 2155
1da177e4
LT		 2156 himask = vc->vc_hi_font_mask;
2157 charmask = himask ? 0x1ff : 0xff;
2158
2159 /* undraw cursor first */
2160 if (IS_FG(vc))
2161 hide_cursor(vc);
2162
0341a4d0
KD		 2163 param.vc = vc;
2164
1da177e4
LT		 2165 while (!tty->stopped && count) {
2166 int orig = *buf;
2167 c = orig;
2168 buf++;
2169 n++;
2170 count--;
2f1a2ccb
EK		 2171 rescan = 0;
2172 inverse = 0;
2173 width = 1;
1da177e4
LT		 2174
2175 /* Do no translation at all in control states */
2176 if (vc->vc_state != ESnormal) {
2177 tc = c;
d4328b40 2178 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2179 /* Combine UTF-8 into Unicode in vc_utf_char.
2180 * vc_utf_count is the number of continuation bytes still
2181 * expected to arrive.
2182 * vc_npar is the number of continuation bytes arrived so
2183 * far
2184 */
d4328b40 2185rescan_last_byte:
2f1a2ccb
EK		 2186 if ((c & 0xc0) == 0x80) {
2187 /* Continuation byte received */
2188 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2189 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2190 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2191 vc->vc_npar++;
2192 if (--vc->vc_utf_count) {
2193 /* Still need some bytes */
1da177e4 2194 continue;
2f1a2ccb
EK		 2195 }
2196 /* Got a whole character */
2197 c = vc->vc_utf_char;
2198 /* Reject overlong sequences */
2199 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2200 c > utf8_length_changes[vc->vc_npar])
2201 c = 0xfffd;
2202 } else {
2203 /* Unexpected continuation byte */
2204 vc->vc_utf_count = 0;
2205 c = 0xfffd;
2206 }
1da177e4 2207 } else {
2f1a2ccb
EK		 2208 /* Single ASCII byte or first byte of a sequence received */
2209 if (vc->vc_utf_count) {
2210 /* Continuation byte expected */
2211 rescan = 1;
2212 vc->vc_utf_count = 0;
2213 c = 0xfffd;
2214 } else if (c > 0x7f) {
2215 /* First byte of a multibyte sequence received */
2216 vc->vc_npar = 0;
2217 if ((c & 0xe0) == 0xc0) {
2218 vc->vc_utf_count = 1;
2219 vc->vc_utf_char = (c & 0x1f);
2220 } else if ((c & 0xf0) == 0xe0) {
2221 vc->vc_utf_count = 2;
2222 vc->vc_utf_char = (c & 0x0f);
2223 } else if ((c & 0xf8) == 0xf0) {
2224 vc->vc_utf_count = 3;
2225 vc->vc_utf_char = (c & 0x07);
2226 } else if ((c & 0xfc) == 0xf8) {
2227 vc->vc_utf_count = 4;
2228 vc->vc_utf_char = (c & 0x03);
2229 } else if ((c & 0xfe) == 0xfc) {
2230 vc->vc_utf_count = 5;
2231 vc->vc_utf_char = (c & 0x01);
2232 } else {
2233 /* 254 and 255 are invalid */
2234 c = 0xfffd;
2235 }
2236 if (vc->vc_utf_count) {
2237 /* Still need some bytes */
2238 continue;
2239 }
2240 }
2241 /* Nothing to do if an ASCII byte was received */
1da177e4 2242 }
2f1a2ccb
EK		 2243 /* End of UTF-8 decoding. */
2244 /* c is the received character, or U+FFFD for invalid sequences. */
2245 /* Replace invalid Unicode code points with U+FFFD too */
2246 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2247 c = 0xfffd;
2248 tc = c;
d4328b40 2249 } else { /* no utf or alternate charset mode */
a29ccf6f 2250 tc = vc_translate(vc, c);
1da177e4
LT		 2251 }
2252
0341a4d0
KD		 2253 param.c = tc;
2254 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2255 &param) == NOTIFY_STOP)
2256 continue;
2257
1da177e4
LT		 2258 /* If the original code was a control character we
2259 * only allow a glyph to be displayed if the code is
2260 * not normally used (such as for cursor movement) or
2261 * if the disp_ctrl mode has been explicitly enabled.
2262 * Certain characters (as given by the CTRL_ALWAYS
2263 * bitmap) are always displayed as control characters,
2264 * as the console would be pretty useless without
2265 * them; to display an arbitrary font position use the
2266 * direct-to-font zone in UTF-8 mode.
2267 */
2268 ok = tc && (c >= 32 ||
d4328b40
AT		 2269 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2270 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2271 && (c != 127 || vc->vc_disp_ctrl)
2272 && (c != 128+27);
2273
2274 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2275 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2276 if (is_double_width(c))
2277 width = 2;
2278 }
1da177e4
LT		 2279 /* Now try to find out how to display it */
2280 tc = conv_uni_to_pc(vc, tc);
d4328b40 2281 if (tc & ~charmask) {
2f1a2ccb
EK		 2282 if (tc == -1 || tc == -2) {
2283 continue; /* nothing to display */
2284 }
2285 /* Glyph not found */
c0b79882 2286 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2287 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2288 This would make absolutely no sense with Unicode in mind,
2289 but do this for ASCII characters since a font may lack
2290 Unicode mapping info and we don't want to end up with
2291 having question marks only. */
2f1a2ccb
EK		 2292 tc = c;
2293 } else {
2294 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2295 tc = conv_uni_to_pc(vc, 0xfffd);
2296 if (tc < 0) {
2297 inverse = 1;
2298 tc = conv_uni_to_pc(vc, '?');
2299 if (tc < 0) tc = '?';
2300 }
2301 }
d4328b40 2302 }
1da177e4 2303
2f1a2ccb
EK		 2304 if (!inverse) {
2305 vc_attr = vc->vc_attr;
1da177e4 2306 } else {
2f1a2ccb
EK		 2307 /* invert vc_attr */
2308 if (!vc->vc_can_do_color) {
2309 vc_attr = (vc->vc_attr) ^ 0x08;
2310 } else if (vc->vc_hi_font_mask == 0x100) {
2311 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2312 } else {
2313 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2314 }
1ed8a2b3 2315 FLUSH
1da177e4 2316 }
2f1a2ccb
EK		 2317
2318 while (1) {
2319 if (vc->vc_need_wrap || vc->vc_decim)
2320 FLUSH
2321 if (vc->vc_need_wrap) {
2322 cr(vc);
2323 lf(vc);
2324 }
2325 if (vc->vc_decim)
2326 insert_char(vc, 1);
2327 scr_writew(himask ?
2328 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2329 (vc_attr << 8) + tc,
2330 (u16 *) vc->vc_pos);
2331 if (DO_UPDATE(vc) && draw_x < 0) {
2332 draw_x = vc->vc_x;
2333 draw_from = vc->vc_pos;
2334 }
2335 if (vc->vc_x == vc->vc_cols - 1) {
2336 vc->vc_need_wrap = vc->vc_decawm;
2337 draw_to = vc->vc_pos + 2;
2338 } else {
2339 vc->vc_x++;
2340 draw_to = (vc->vc_pos += 2);
d4328b40 2341 }
2f1a2ccb
EK		 2342
2343 if (!--width) break;
2344
2345 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2346 if (tc < 0) tc = ' ';
2347 }
b293d758 2348 notify_write(vc, c);
2f1a2ccb 2349
1ed8a2b3
EK		 2350 if (inverse) {
2351 FLUSH
2352 }
2353
2f1a2ccb
EK		 2354 if (rescan) {
2355 rescan = 0;
2356 inverse = 0;
2357 width = 1;
d4328b40
AT		 2358 c = orig;
2359 goto rescan_last_byte;
2360 }
1da177e4
LT		 2361 continue;
2362 }
2363 FLUSH
2364 do_con_trol(tty, vc, orig);
2365 }
2366 FLUSH
2367 console_conditional_schedule();
2368 release_console_sem();
b293d758 2369 notify_update(vc);
1da177e4
LT		 2370 return n;
2371#undef FLUSH
2372}
2373
2374/*
2375 * This is the console switching callback.
2376 *
2377 * Doing console switching in a process context allows
2378 * us to do the switches asynchronously (needed when we want
2379 * to switch due to a keyboard interrupt). Synchronization
2380 * with other console code and prevention of re-entrancy is
2381 * ensured with console_sem.
2382 */
65f27f38 2383static void console_callback(struct work_struct *ignored)
1da177e4
LT		 2384{
2385 acquire_console_sem();
2386
2387 if (want_console >= 0) {
2388 if (want_console != fg_console &&
2389 vc_cons_allocated(want_console)) {
2390 hide_cursor(vc_cons[fg_console].d);
2391 change_console(vc_cons[want_console].d);
2392 /* we only changed when the console had already
2393 been allocated - a new console is not created
2394 in an interrupt routine */
2395 }
2396 want_console = -1;
2397 }
2398 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2399 do_poke_blanked_console = 0;
2400 poke_blanked_console();
2401 }
2402 if (scrollback_delta) {
2403 struct vc_data *vc = vc_cons[fg_console].d;
2404 clear_selection();
2405 if (vc->vc_mode == KD_TEXT)
2406 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2407 scrollback_delta = 0;
2408 }
2409 if (blank_timer_expired) {
2410 do_blank_screen(0);
2411 blank_timer_expired = 0;
2412 }
b293d758 2413 notify_update(vc_cons[fg_console].d);
1da177e4
LT		 2414
2415 release_console_sem();
2416}
2417
b257bc05 2418int set_console(int nr)
1da177e4 2419{
b257bc05
AJ		 2420 struct vc_data *vc = vc_cons[fg_console].d;
2421
2422 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2423 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2424
2425 /*
2426 * Console switch will fail in console_callback() or
2427 * change_console() so there is no point scheduling
2428 * the callback
2429 *
2430 * Existing set_console() users don't check the return
2431 * value so this shouldn't break anything
2432 */
2433 return -EINVAL;
2434 }
2435
1da177e4
LT		 2436 want_console = nr;
2437 schedule_console_callback();
b257bc05
AJ		 2438
2439 return 0;
1da177e4
LT		 2440}
2441
2442struct tty_driver *console_driver;
2443
2444#ifdef CONFIG_VT_CONSOLE
2445
5ada918b
BW		 2446/**
2447 * vt_kmsg_redirect() - Sets/gets the kernel message console
2448 * @new: The new virtual terminal number or -1 if the console should stay
2449 * unchanged
2450 *
2451 * By default, the kernel messages are always printed on the current virtual
2452 * console. However, the user may modify that default with the
2453 * TIOCL_SETKMSGREDIRECT ioctl call.
2454 *
2455 * This function sets the kernel message console to be @new. It returns the old
2456 * virtual console number. The virtual terminal number 0 (both as parameter and
2457 * return value) means no redirection (i.e. always printed on the currently
2458 * active console).
2459 *
2460 * The parameter -1 means that only the current console is returned, but the
2461 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2462 * case to make the code more understandable.
2463 *
2464 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2465 * the parameter and always returns 0.
2466 */
2467int vt_kmsg_redirect(int new)
2468{
2469 static int kmsg_con;
2470
2471 if (new != -1)
2472 return xchg(&kmsg_con, new);
2473 else
2474 return kmsg_con;
2475}
2476
1da177e4
LT		 2477/*
2478 * Console on virtual terminal
2479 *
2480 * The console must be locked when we get here.
2481 */
2482
2483static void vt_console_print(struct console *co, const char *b, unsigned count)
2484{
2485 struct vc_data *vc = vc_cons[fg_console].d;
2486 unsigned char c;
b0940003 2487 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2488 const ushort *start;
2489 ushort cnt = 0;
2490 ushort myx;
5ada918b 2491 int kmsg_console;
1da177e4
LT		 2492
2493 /* console busy or not yet initialized */
b0940003
NP		 2494 if (!printable)
2495 return;
2496 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2497 return;
2498
5ada918b
BW		 2499 kmsg_console = vt_get_kmsg_redirect();
2500 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2501 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2502
2503 /* read `x' only after setting currcons properly (otherwise
2504 the `x' macro will read the x of the foreground console). */
2505 myx = vc->vc_x;
2506
2507 if (!vc_cons_allocated(fg_console)) {
2508 /* impossible */
2509 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2510 goto quit;
2511 }
2512
8fd4bd22 2513 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2514 goto quit;
2515
2516 /* undraw cursor first */
2517 if (IS_FG(vc))
2518 hide_cursor(vc);
2519
2520 start = (ushort *)vc->vc_pos;
2521
2522 /* Contrived structure to try to emulate original need_wrap behaviour
2523 * Problems caused when we have need_wrap set on '\n' character */
2524 while (count--) {
2525 c = *b++;
2526 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2527 if (cnt > 0) {
2528 if (CON_IS_VISIBLE(vc))
2529 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2530 vc->vc_x += cnt;
2531 if (vc->vc_need_wrap)
2532 vc->vc_x--;
2533 cnt = 0;
2534 }
2535 if (c == 8) { /* backspace */
2536 bs(vc);
2537 start = (ushort *)vc->vc_pos;
2538 myx = vc->vc_x;
2539 continue;
2540 }
2541 if (c != 13)
2542 lf(vc);
2543 cr(vc);
2544 start = (ushort *)vc->vc_pos;
2545 myx = vc->vc_x;
2546 if (c == 10 || c == 13)
2547 continue;
2548 }
2549 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2550 notify_write(vc, c);
1da177e4
LT		 2551 cnt++;
2552 if (myx == vc->vc_cols - 1) {
2553 vc->vc_need_wrap = 1;
2554 continue;
2555 }
2556 vc->vc_pos += 2;
2557 myx++;
2558 }
2559 if (cnt > 0) {
2560 if (CON_IS_VISIBLE(vc))
2561 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2562 vc->vc_x += cnt;
2563 if (vc->vc_x == vc->vc_cols) {
2564 vc->vc_x--;
2565 vc->vc_need_wrap = 1;
2566 }
2567 }
2568 set_cursor(vc);
b293d758 2569 notify_update(vc);
1da177e4
LT		 2570
2571quit:
b0940003 2572 spin_unlock(&printing_lock);
1da177e4
LT		 2573}
2574
2575static struct tty_driver *vt_console_device(struct console *c, int *index)
2576{
2577 *index = c->index ? c->index-1 : fg_console;
2578 return console_driver;
2579}
2580
2581static struct console vt_console_driver = {
2582 .name = "tty",
2583 .write = vt_console_print,
2584 .device = vt_console_device,
2585 .unblank = unblank_screen,
2586 .flags = CON_PRINTBUFFER,
2587 .index = -1,
2588};
2589#endif
2590
2591/*
2592 * Handling of Linux-specific VC ioctls
2593 */
2594
2595/*
2596 * Generally a bit racy with respect to console_sem().
2597 *
2598 * There are some functions which don't need it.
2599 *
2600 * There are some functions which can sleep for arbitrary periods
2601 * (paste_selection) but we don't need the lock there anyway.
2602 *
2603 * set_selection has locking, and definitely needs it
2604 */
2605
2606int tioclinux(struct tty_struct *tty, unsigned long arg)
2607{
2608 char type, data;
2609 char __user *p = (char __user *)arg;
2610 int lines;
2611 int ret;
2612
1da177e4
LT		 2613 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2614 return -EPERM;
2615 if (get_user(type, p))
2616 return -EFAULT;
2617 ret = 0;
04f378b1 2618
1da177e4
LT		 2619 switch (type)
2620 {
2621 case TIOCL_SETSEL:
2622 acquire_console_sem();
2623 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2624 release_console_sem();
2625 break;
2626 case TIOCL_PASTESEL:
2627 ret = paste_selection(tty);
2628 break;
2629 case TIOCL_UNBLANKSCREEN:
2d237c63 2630 acquire_console_sem();
1da177e4 2631 unblank_screen();
2d237c63 2632 release_console_sem();
1da177e4
LT		 2633 break;
2634 case TIOCL_SELLOADLUT:
2635 ret = sel_loadlut(p);
2636 break;
2637 case TIOCL_GETSHIFTSTATE:
04f378b1 2638
1da177e4
LT		 2639 /*
2640 * Make it possible to react to Shift+Mousebutton.
2641 * Note that 'shift_state' is an undocumented
2642 * kernel-internal variable; programs not closely
2643 * related to the kernel should not use this.
2644 */
2645 data = shift_state;
2646 ret = __put_user(data, p);
2647 break;
2648 case TIOCL_GETMOUSEREPORTING:
2649 data = mouse_reporting();
2650 ret = __put_user(data, p);
2651 break;
2652 case TIOCL_SETVESABLANK:
403aac96 2653 ret = set_vesa_blanking(p);
1da177e4 2654 break;
0ca07731 2655 case TIOCL_GETKMSGREDIRECT:
5ada918b 2656 data = vt_get_kmsg_redirect();
0ca07731
RW		 2657 ret = __put_user(data, p);
2658 break;
1da177e4
LT		 2659 case TIOCL_SETKMSGREDIRECT:
2660 if (!capable(CAP_SYS_ADMIN)) {
2661 ret = -EPERM;
2662 } else {
2663 if (get_user(data, p+1))
2664 ret = -EFAULT;
2665 else
5ada918b 2666 vt_kmsg_redirect(data);
1da177e4
LT		 2667 }
2668 break;
2669 case TIOCL_GETFGCONSOLE:
2670 ret = fg_console;
2671 break;
2672 case TIOCL_SCROLLCONSOLE:
2673 if (get_user(lines, (s32 __user *)(p+4))) {
2674 ret = -EFAULT;
2675 } else {
2676 scrollfront(vc_cons[fg_console].d, lines);
2677 ret = 0;
2678 }
2679 break;
2680 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2d237c63 2681 acquire_console_sem();
1da177e4
LT		 2682 ignore_poke = 1;
2683 do_blank_screen(0);
2d237c63 2684 release_console_sem();
1da177e4
LT		 2685 break;
2686 case TIOCL_BLANKEDSCREEN:
2687 ret = console_blanked;
2688 break;
2689 default:
2690 ret = -EINVAL;
2691 break;
2692 }
2693 return ret;
2694}
2695
2696/*
2697 * /dev/ttyN handling
2698 */
2699
2700static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2701{
2702 int retval;
2703
2704 retval = do_con_write(tty, buf, count);
2705 con_flush_chars(tty);
2706
2707 return retval;
2708}
2709
5d19f546 2710static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2711{
2712 if (in_interrupt())
5d19f546
AC		 2713 return 0; /* n_r3964 calls put_char() from interrupt context */
2714 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2715}
2716
2717static int con_write_room(struct tty_struct *tty)
2718{
2719 if (tty->stopped)
2720 return 0;
a88a69c9 2721 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2722}
2723
2724static int con_chars_in_buffer(struct tty_struct *tty)
2725{
2726 return 0; /* we're not buffering */
2727}
2728
2729/*
2730 * con_throttle and con_unthrottle are only used for
2731 * paste_selection(), which has to stuff in a large number of
2732 * characters...
2733 */
2734static void con_throttle(struct tty_struct *tty)
2735{
2736}
2737
2738static void con_unthrottle(struct tty_struct *tty)
2739{
2740 struct vc_data *vc = tty->driver_data;
2741
2742 wake_up_interruptible(&vc->paste_wait);
2743}
2744
2745/*
2746 * Turn the Scroll-Lock LED on when the tty is stopped
2747 */
2748static void con_stop(struct tty_struct *tty)
2749{
2750 int console_num;
2751 if (!tty)
2752 return;
2753 console_num = tty->index;
2754 if (!vc_cons_allocated(console_num))
2755 return;
2756 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2757 set_leds();
2758}
2759
2760/*
2761 * Turn the Scroll-Lock LED off when the console is started
2762 */
2763static void con_start(struct tty_struct *tty)
2764{
2765 int console_num;
2766 if (!tty)
2767 return;
2768 console_num = tty->index;
2769 if (!vc_cons_allocated(console_num))
2770 return;
2771 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2772 set_leds();
2773}
2774
2775static void con_flush_chars(struct tty_struct *tty)
2776{
2777 struct vc_data *vc;
2778
2779 if (in_interrupt()) /* from flush_to_ldisc */
2780 return;
2781
2782 /* if we race with con_close(), vt may be null */
2783 acquire_console_sem();
2784 vc = tty->driver_data;
2785 if (vc)
2786 set_cursor(vc);
2787 release_console_sem();
2788}
2789
2790/*
2791 * Allocate the console screen memory.
2792 */
2793static int con_open(struct tty_struct *tty, struct file *filp)
2794{
2795 unsigned int currcons = tty->index;
2796 int ret = 0;
2797
2798 acquire_console_sem();
f786648b 2799 if (tty->driver_data == NULL) {
1da177e4
LT		 2800 ret = vc_allocate(currcons);
2801 if (ret == 0) {
2802 struct vc_data *vc = vc_cons[currcons].d;
feebed65
AC		 2803
2804 /* Still being freed */
8ce73264 2805 if (vc->port.tty) {
feebed65
AC		 2806 release_console_sem();
2807 return -ERESTARTSYS;
2808 }
1da177e4 2809 tty->driver_data = vc;
8ce73264 2810 vc->port.tty = tty;
1da177e4
LT		 2811
2812 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2813 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2814 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2815 }
c1236d31
ST		 2816 if (vc->vc_utf)
2817 tty->termios->c_iflag |= IUTF8;
2818 else
2819 tty->termios->c_iflag &= ~IUTF8;
e0426e6a 2820 release_console_sem();
1da177e4
LT		 2821 return ret;
2822 }
2823 }
2824 release_console_sem();
2825 return ret;
2826}
2827
1da177e4
LT		 2828static void con_close(struct tty_struct *tty, struct file *filp)
2829{
feebed65
AC		 2830 /* Nothing to do - we defer to shutdown */
2831}
1da177e4 2832
feebed65
AC		 2833static void con_shutdown(struct tty_struct *tty)
2834{
2835 struct vc_data *vc = tty->driver_data;
2836 BUG_ON(vc == NULL);
2837 acquire_console_sem();
8ce73264 2838 vc->port.tty = NULL;
1da177e4 2839 release_console_sem();
feebed65 2840 tty_shutdown(tty);
1da177e4
LT		 2841}
2842
fa6ce9ab
JE		 2843static int default_italic_color = 2; // green (ASCII)
2844static int default_underline_color = 3; // cyan (ASCII)
2845module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2846module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2847
1da177e4
LT		 2848static void vc_init(struct vc_data *vc, unsigned int rows,
2849 unsigned int cols, int do_clear)
2850{
2851 int j, k ;
2852
2853 vc->vc_cols = cols;
2854 vc->vc_rows = rows;
2855 vc->vc_size_row = cols << 1;
2856 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2857
2858 set_origin(vc);
2859 vc->vc_pos = vc->vc_origin;
2860 reset_vc(vc);
2861 for (j=k=0; j<16; j++) {
2862 vc->vc_palette[k++] = default_red[j] ;
2863 vc->vc_palette[k++] = default_grn[j] ;
2864 vc->vc_palette[k++] = default_blu[j] ;
2865 }
2866 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2867 vc->vc_ulcolor = default_underline_color;
2868 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2869 vc->vc_halfcolor = 0x08; /* grey */
2870 init_waitqueue_head(&vc->paste_wait);
2871 reset_terminal(vc, do_clear);
2872}
2873
2874/*
2875 * This routine initializes console interrupts, and does nothing
2876 * else. If you want the screen to clear, call tty_write with
2877 * the appropriate escape-sequence.
2878 */
2879
2880static int __init con_init(void)
2881{
2882 const char *display_desc = NULL;
2883 struct vc_data *vc;
3e795de7 2884 unsigned int currcons = 0, i;
1da177e4
LT		 2885
2886 acquire_console_sem();
2887
2888 if (conswitchp)
2889 display_desc = conswitchp->con_startup();
2890 if (!display_desc) {
2891 fg_console = 0;
2892 release_console_sem();
2893 return 0;
2894 }
2895
3e795de7
AD		 2896 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2897 struct con_driver *con_driver = &registered_con_driver[i];
2898
2899 if (con_driver->con == NULL) {
2900 con_driver->con = conswitchp;
2901 con_driver->desc = display_desc;
2902 con_driver->flag = CON_DRIVER_FLAG_INIT;
2903 con_driver->first = 0;
2904 con_driver->last = MAX_NR_CONSOLES - 1;
2905 break;
2906 }
2907 }
2908
2909 for (i = 0; i < MAX_NR_CONSOLES; i++)
2910 con_driver_map[i] = conswitchp;
2911
1da177e4
LT		 2912 if (blankinterval) {
2913 blank_state = blank_normal_wait;
f324edc8 2914 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2915 }
2916
1da177e4 2917 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2918 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2919 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2920 tty_port_init(&vc->port);
1da177e4 2921 visual_init(vc, currcons, 1);
a5f4f52e 2922 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2923 vc_init(vc, vc->vc_rows, vc->vc_cols,
2924 currcons || !vc->vc_sw->con_save_screen);
2925 }
2926 currcons = fg_console = 0;
2927 master_display_fg = vc = vc_cons[currcons].d;
2928 set_origin(vc);
2929 save_screen(vc);
2930 gotoxy(vc, vc->vc_x, vc->vc_y);
2931 csi_J(vc, 0);
2932 update_screen(vc);
2933 printk("Console: %s %s %dx%d",
2934 vc->vc_can_do_color ? "colour" : "mono",
2935 display_desc, vc->vc_cols, vc->vc_rows);
2936 printable = 1;
2937 printk("\n");
2938
2939 release_console_sem();
2940
2941#ifdef CONFIG_VT_CONSOLE
2942 register_console(&vt_console_driver);
2943#endif
2944 return 0;
2945}
2946console_initcall(con_init);
2947
b68e31d0 2948static const struct tty_operations con_ops = {
1da177e4
LT		 2949 .open = con_open,
2950 .close = con_close,
2951 .write = con_write,
2952 .write_room = con_write_room,
2953 .put_char = con_put_char,
2954 .flush_chars = con_flush_chars,
2955 .chars_in_buffer = con_chars_in_buffer,
2956 .ioctl = vt_ioctl,
e9216651
AB		 2957#ifdef CONFIG_COMPAT
2958 .compat_ioctl = vt_compat_ioctl,
2959#endif
1da177e4
LT		 2960 .stop = con_stop,
2961 .start = con_start,
2962 .throttle = con_throttle,
2963 .unthrottle = con_unthrottle,
8c9a9dd0 2964 .resize = vt_resize,
feebed65 2965 .shutdown = con_shutdown
1da177e4
LT		 2966};
2967
d81ed103
AC		 2968static struct cdev vc0_cdev;
2969
2970int __init vty_init(const struct file_operations *console_fops)
1da177e4 2971{
d81ed103
AC		 2972 cdev_init(&vc0_cdev, console_fops);
2973 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2974 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2975 panic("Couldn't register /dev/tty0 driver\n");
2976 device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2977
1da177e4
LT		 2978 vcs_init();
2979
2980 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2981 if (!console_driver)
2982 panic("Couldn't allocate console driver\n");
2983 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2984 console_driver->name = "tty";
2985 console_driver->name_base = 1;
2986 console_driver->major = TTY_MAJOR;
2987 console_driver->minor_start = 1;
2988 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2989 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 2990 if (default_utf8)
2991 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 2992 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2993 tty_set_operations(console_driver, &con_ops);
2994 if (tty_register_driver(console_driver))
2995 panic("Couldn't register console driver\n");
1da177e4
LT		 2996 kbd_init();
2997 console_map_init();
1da177e4
LT		 2998#ifdef CONFIG_MDA_CONSOLE
2999 mda_console_init();
3000#endif
3001 return 0;
3002}
3003
3004#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3005
3006static struct class *vtconsole_class;
3007
b7269dd2
JB		 3008static int bind_con_driver(const struct consw *csw, int first, int last,
3009 int deflt)
1da177e4 3010{
3e795de7
AD		 3011 struct module *owner = csw->owner;
3012 const char *desc = NULL;
3013 struct con_driver *con_driver;
3014 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3015
1da177e4
LT		 3016 if (!try_module_get(owner))
3017 return -ENODEV;
3018
1c8ce271 3019 acquire_console_sem();
1c8ce271 3020
3e795de7
AD		 3021 /* check if driver is registered */
3022 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3023 con_driver = &registered_con_driver[i];
3024
3025 if (con_driver->con == csw) {
3026 desc = con_driver->desc;
3027 retval = 0;
3028 break;
3029 }
3030 }
3031
3032 if (retval)
3033 goto err;
3034
3035 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3036 csw->con_startup();
3037 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3038 }
1c8ce271 3039
1da177e4
LT		 3040 if (deflt) {
3041 if (conswitchp)
3042 module_put(conswitchp->owner);
1c8ce271 3043
1da177e4
LT		 3044 __module_get(owner);
3045 conswitchp = csw;
3046 }
3047
3e795de7
AD		 3048 first = max(first, con_driver->first);
3049 last = min(last, con_driver->last);
3050
1da177e4
LT		 3051 for (i = first; i <= last; i++) {
3052 int old_was_color;
3053 struct vc_data *vc = vc_cons[i].d;
3054
3055 if (con_driver_map[i])
3056 module_put(con_driver_map[i]->owner);
3057 __module_get(owner);
3058 con_driver_map[i] = csw;
3059
3060 if (!vc || !vc->vc_sw)
3061 continue;
3062
3063 j = i;
1c8ce271 3064
4ee1acce
DH		 3065 if (CON_IS_VISIBLE(vc)) {
3066 k = i;
1da177e4 3067 save_screen(vc);
4ee1acce
DH		 3068 }
3069
1da177e4
LT		 3070 old_was_color = vc->vc_can_do_color;
3071 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3072 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3073 visual_init(vc, i, 0);
1c8ce271 3074 set_origin(vc);
1da177e4
LT		 3075 update_attr(vc);
3076
3077 /* If the console changed between mono <-> color, then
3078 * the attributes in the screenbuf will be wrong. The
3079 * following resets all attributes to something sane.
3080 */
3081 if (old_was_color != vc->vc_can_do_color)
3082 clear_buffer_attributes(vc);
1da177e4 3083 }
4ee1acce 3084
1da177e4
LT		 3085 printk("Console: switching ");
3086 if (!deflt)
3087 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3088 if (j >= 0) {
3089 struct vc_data *vc = vc_cons[j].d;
3090
1da177e4 3091 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3092 vc->vc_can_do_color ? "colour" : "mono",
3093 desc, vc->vc_cols, vc->vc_rows);
3094
3095 if (k >= 0) {
3096 vc = vc_cons[k].d;
3097 update_screen(vc);
3098 }
3099 } else
1da177e4
LT		 3100 printk("to %s\n", desc);
3101
3e795de7
AD		 3102 retval = 0;
3103err:
1da177e4 3104 release_console_sem();
1da177e4 3105 module_put(owner);
3e795de7
AD		 3106 return retval;
3107};
1da177e4 3108
13ae6645
AD		 3109#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3110static int con_is_graphics(const struct consw *csw, int first, int last)
3111{
3112 int i, retval = 0;
3113
3114 for (i = first; i <= last; i++) {
3115 struct vc_data *vc = vc_cons[i].d;
3116
3117 if (vc && vc->vc_mode == KD_GRAPHICS) {
3118 retval = 1;
3119 break;
3120 }
3121 }
3122
3123 return retval;
3124}
3125
b7269dd2
JB		 3126/**
3127 * unbind_con_driver - unbind a console driver
3128 * @csw: pointer to console driver to unregister
3129 * @first: first in range of consoles that @csw should be unbound from
3130 * @last: last in range of consoles that @csw should be unbound from
3131 * @deflt: should next bound console driver be default after @csw is unbound?
3132 *
3133 * To unbind a driver from all possible consoles, pass 0 as @first and
3134 * %MAX_NR_CONSOLES as @last.
3135 *
3136 * @deflt controls whether the console that ends up replacing @csw should be
3137 * the default console.
3138 *
3139 * RETURNS:
3140 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3141 * or 0 on success.
3142 */
623e71b0 3143int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3144{
3e795de7
AD		 3145 struct module *owner = csw->owner;
3146 const struct consw *defcsw = NULL;
3147 struct con_driver *con_driver = NULL, *con_back = NULL;
3148 int i, retval = -ENODEV;
1da177e4 3149
3e795de7
AD		 3150 if (!try_module_get(owner))
3151 return -ENODEV;
3152
3153 acquire_console_sem();
3154
3155 /* check if driver is registered and if it is unbindable */
3156 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3157 con_driver = &registered_con_driver[i];
3158
3159 if (con_driver->con == csw &&
6db4063c 3160 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3161 retval = 0;
3162 break;
3163 }
3164 }
3165
3166 if (retval) {
3167 release_console_sem();
3168 goto err;
3169 }
3170
6db4063c
AD		 3171 retval = -ENODEV;
3172
3e795de7
AD		 3173 /* check if backup driver exists */
3174 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3175 con_back = &registered_con_driver[i];
3176
3177 if (con_back->con &&
6db4063c 3178 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3179 defcsw = con_back->con;
3180 retval = 0;
3181 break;
3182 }
3183 }
3184
3185 if (retval) {
3186 release_console_sem();
3187 goto err;
3188 }
3189
3190 if (!con_is_bound(csw)) {
3191 release_console_sem();
3192 goto err;
3193 }
3194
3195 first = max(first, con_driver->first);
3196 last = min(last, con_driver->last);
3197
3198 for (i = first; i <= last; i++) {
1da177e4
LT		 3199 if (con_driver_map[i] == csw) {
3200 module_put(csw->owner);
3201 con_driver_map[i] = NULL;
3202 }
3e795de7
AD		 3203 }
3204
3205 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3206 const struct consw *defconsw = conswitchp;
3207
3e795de7
AD		 3208 defcsw->con_startup();
3209 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3210 /*
3211 * vgacon may change the default driver to point
3212 * to dummycon, we restore it here...
3213 */
3214 conswitchp = defconsw;
3e795de7
AD		 3215 }
3216
3217 if (!con_is_bound(csw))
3218 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3219
3220 release_console_sem();
6db4063c
AD		 3221 /* ignore return value, binding should not fail */
3222 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3223err:
3224 module_put(owner);
3225 return retval;
3226
3227}
623e71b0 3228EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3229
6db4063c
AD		 3230static int vt_bind(struct con_driver *con)
3231{
3232 const struct consw *defcsw = NULL, *csw = NULL;
3233 int i, more = 1, first = -1, last = -1, deflt = 0;
3234
3235 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3236 con_is_graphics(con->con, con->first, con->last))
3237 goto err;
3238
3239 csw = con->con;
3240
3241 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3242 struct con_driver *con = &registered_con_driver[i];
3243
3244 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3245 defcsw = con->con;
3246 break;
3247 }
3248 }
3249
3250 if (!defcsw)
3251 goto err;
3252
3253 while (more) {
3254 more = 0;
3255
3256 for (i = con->first; i <= con->last; i++) {
3257 if (con_driver_map[i] == defcsw) {
3258 if (first == -1)
3259 first = i;
3260 last = i;
3261 more = 1;
3262 } else if (first != -1)
3263 break;
3264 }
3265
3266 if (first == 0 && last == MAX_NR_CONSOLES -1)
3267 deflt = 1;
3268
3269 if (first != -1)
3270 bind_con_driver(csw, first, last, deflt);
3271
3272 first = -1;
3273 last = -1;
3274 deflt = 0;
3275 }
3276
3277err:
3278 return 0;
3279}
3280
3281static int vt_unbind(struct con_driver *con)
3282{
3283 const struct consw *csw = NULL;
3284 int i, more = 1, first = -1, last = -1, deflt = 0;
3285
3286 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3287 con_is_graphics(con->con, con->first, con->last))
3288 goto err;
3289
3290 csw = con->con;
3291
3292 while (more) {
3293 more = 0;
3294
3295 for (i = con->first; i <= con->last; i++) {
3296 if (con_driver_map[i] == csw) {
3297 if (first == -1)
3298 first = i;
3299 last = i;
3300 more = 1;
3301 } else if (first != -1)
3302 break;
3303 }
3304
3305 if (first == 0 && last == MAX_NR_CONSOLES -1)
3306 deflt = 1;
3307
3308 if (first != -1)
3309 unbind_con_driver(csw, first, last, deflt);
3310
3311 first = -1;
3312 last = -1;
3313 deflt = 0;
3314 }
3315
3316err:
3317 return 0;
3318}
13ae6645
AD		 3319#else
3320static inline int vt_bind(struct con_driver *con)
3321{
3322 return 0;
3323}
3324static inline int vt_unbind(struct con_driver *con)
3325{
3326 return 0;
3327}
3328#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3329
805952a8 3330static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3331 const char *buf, size_t count)
3332{
805952a8 3333 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3334 int bind = simple_strtoul(buf, NULL, 0);
3335
3336 if (bind)
3337 vt_bind(con);
3338 else
3339 vt_unbind(con);
3340
3341 return count;
3342}
3343
805952a8
GKH		 3344static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3345 char *buf)
6db4063c 3346{
805952a8 3347 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3348 int bind = con_is_bound(con->con);
3349
3350 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3351}
3352
805952a8
GKH		 3353static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3354 char *buf)
6db4063c 3355{
805952a8 3356 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3357
3358 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3359 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3360 con->desc);
3361
3362}
3363
805952a8 3364static struct device_attribute device_attrs[] = {
6db4063c
AD		 3365 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3366 __ATTR(name, S_IRUGO, show_name, NULL),
3367};
3368
805952a8 3369static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3370{
3371 int i;
928e964f 3372 int error = 0;
6db4063c 3373
928e964f 3374 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3375 dev_set_drvdata(con->dev, con);
3376 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3377 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3378 if (error)
3379 break;
3380 }
6db4063c 3381
928e964f
AD		 3382 if (error) {
3383 while (--i >= 0)
805952a8 3384 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3385 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3386 }
3387
3388 return error;
6db4063c
AD		 3389}
3390
805952a8 3391static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3392{
3393 int i;
3394
928e964f 3395 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3396 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3397 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3398 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3399 }
6db4063c
AD		 3400}
3401
3e795de7
AD		 3402/**
3403 * con_is_bound - checks if driver is bound to the console
3404 * @csw: console driver
3405 *
3406 * RETURNS: zero if unbound, nonzero if bound
3407 *
3408 * Drivers can call this and if zero, they should release
3409 * all resources allocated on con_startup()
3410 */
3411int con_is_bound(const struct consw *csw)
3412{
3413 int i, bound = 0;
3414
3415 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3416 if (con_driver_map[i] == csw) {
3417 bound = 1;
3418 break;
3419 }
3420 }
3421
3422 return bound;
3423}
3424EXPORT_SYMBOL(con_is_bound);
3425
b45cfba4
JB		 3426/**
3427 * con_debug_enter - prepare the console for the kernel debugger
3428 * @sw: console driver
3429 *
3430 * Called when the console is taken over by the kernel debugger, this
3431 * function needs to save the current console state, then put the console
3432 * into a state suitable for the kernel debugger.
3433 *
3434 * RETURNS:
3435 * Zero on success, nonzero if a failure occurred when trying to prepare
3436 * the console for the debugger.
3437 */
3438int con_debug_enter(struct vc_data *vc)
3439{
3440 int ret = 0;
3441
3442 saved_fg_console = fg_console;
3443 saved_last_console = last_console;
3444 saved_want_console = want_console;
3445 saved_vc_mode = vc->vc_mode;
beed5336 3446 saved_console_blanked = console_blanked;
b45cfba4
JB		 3447 vc->vc_mode = KD_TEXT;
3448 console_blanked = 0;
3449 if (vc->vc_sw->con_debug_enter)
3450 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3451#ifdef CONFIG_KGDB_KDB
3452 /* Set the initial LINES variable if it is not already set */
3453 if (vc->vc_rows < 999) {
3454 int linecount;
3455 char lns[4];
3456 const char *setargs[3] = {
3457 "set",
3458 "LINES",
3459 lns,
3460 };
3461 if (kdbgetintenv(setargs[0], &linecount)) {
3462 snprintf(lns, 4, "%i", vc->vc_rows);
3463 kdb_set(2, setargs);
3464 }
3465 }
3466#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3467 return ret;
3468}
3469EXPORT_SYMBOL_GPL(con_debug_enter);
3470
3471/**
3472 * con_debug_leave - restore console state
3473 * @sw: console driver
3474 *
3475 * Restore the console state to what it was before the kernel debugger
3476 * was invoked.
3477 *
3478 * RETURNS:
3479 * Zero on success, nonzero if a failure occurred when trying to restore
3480 * the console.
3481 */
3482int con_debug_leave(void)
3483{
3484 struct vc_data *vc;
3485 int ret = 0;
3486
3487 fg_console = saved_fg_console;
3488 last_console = saved_last_console;
3489 want_console = saved_want_console;
beed5336 3490 console_blanked = saved_console_blanked;
b45cfba4
JB		 3491 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3492
3493 vc = vc_cons[fg_console].d;
3494 if (vc->vc_sw->con_debug_leave)
3495 ret = vc->vc_sw->con_debug_leave(vc);
3496 return ret;
3497}
3498EXPORT_SYMBOL_GPL(con_debug_leave);
3499
3e795de7
AD		 3500/**
3501 * register_con_driver - register console driver to console layer
3502 * @csw: console driver
3503 * @first: the first console to take over, minimum value is 0
3504 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3505 *
3506 * DESCRIPTION: This function registers a console driver which can later
3507 * bind to a range of consoles specified by @first and @last. It will
3508 * also initialize the console driver by calling con_startup().
3509 */
3510int register_con_driver(const struct consw *csw, int first, int last)
3511{
3512 struct module *owner = csw->owner;
3513 struct con_driver *con_driver;
3514 const char *desc;
3515 int i, retval = 0;
3516
3517 if (!try_module_get(owner))
3518 return -ENODEV;
3519
3520 acquire_console_sem();
3521
3522 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3523 con_driver = &registered_con_driver[i];
3524
3525 /* already registered */
3526 if (con_driver->con == csw)
3527 retval = -EINVAL;
3528 }
3529
3530 if (retval)
3531 goto err;
3532
3533 desc = csw->con_startup();
3534
3535 if (!desc)
3536 goto err;
3537
3538 retval = -EINVAL;
3539
3540 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3541 con_driver = &registered_con_driver[i];
3542
3543 if (con_driver->con == NULL) {
3544 con_driver->con = csw;
3545 con_driver->desc = desc;
6db4063c
AD		 3546 con_driver->node = i;
3547 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3548 CON_DRIVER_FLAG_INIT;
3549 con_driver->first = first;
3550 con_driver->last = last;
3551 retval = 0;
3552 break;
3553 }
3554 }
3555
6db4063c
AD		 3556 if (retval)
3557 goto err;
3558
d81ed103 3559 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3560 MKDEV(0, con_driver->node),
3561 NULL, "vtcon%i",
3562 con_driver->node);
6db4063c 3563
805952a8
GKH		 3564 if (IS_ERR(con_driver->dev)) {
3565 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3566 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3567 PTR_ERR(con_driver->dev));
3568 con_driver->dev = NULL;
6db4063c 3569 } else {
805952a8 3570 vtconsole_init_device(con_driver);
6db4063c 3571 }
928e964f 3572
3e795de7
AD		 3573err:
3574 release_console_sem();
3575 module_put(owner);
3576 return retval;
3577}
3578EXPORT_SYMBOL(register_con_driver);
3579
3580/**
3581 * unregister_con_driver - unregister console driver from console layer
3582 * @csw: console driver
3583 *
3584 * DESCRIPTION: All drivers that registers to the console layer must
3585 * call this function upon exit, or if the console driver is in a state
3586 * where it won't be able to handle console services, such as the
3587 * framebuffer console without loaded framebuffer drivers.
3588 *
3589 * The driver must unbind first prior to unregistration.
3590 */
3591int unregister_con_driver(const struct consw *csw)
3592{
3593 int i, retval = -ENODEV;
3594
3595 acquire_console_sem();
3596
3597 /* cannot unregister a bound driver */
3598 if (con_is_bound(csw))
3599 goto err;
3600
3601 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3602 struct con_driver *con_driver = &registered_con_driver[i];
3603
3604 if (con_driver->con == csw &&
6db4063c 3605 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3606 vtconsole_deinit_device(con_driver);
3607 device_destroy(vtconsole_class,
3608 MKDEV(0, con_driver->node));
3e795de7
AD		 3609 con_driver->con = NULL;
3610 con_driver->desc = NULL;
805952a8 3611 con_driver->dev = NULL;
6db4063c 3612 con_driver->node = 0;
3e795de7
AD		 3613 con_driver->flag = 0;
3614 con_driver->first = 0;
3615 con_driver->last = 0;
3616 retval = 0;
3617 break;
3618 }
3619 }
3e795de7
AD		 3620err:
3621 release_console_sem();
3622 return retval;
3623}
3624EXPORT_SYMBOL(unregister_con_driver);
3625
3626/*
3627 * If we support more console drivers, this function is used
3628 * when a driver wants to take over some existing consoles
3629 * and become default driver for newly opened ones.
3630 *
3631 * take_over_console is basically a register followed by unbind
3632 */
3633int take_over_console(const struct consw *csw, int first, int last, int deflt)
3634{
3635 int err;
3636
3637 err = register_con_driver(csw, first, last);
3638
3639 if (!err)
6db4063c 3640 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3641
3642 return err;
3643}
3644
3645/*
3646 * give_up_console is a wrapper to unregister_con_driver. It will only
3647 * work if driver is fully unbound.
3648 */
3649void give_up_console(const struct consw *csw)
3650{
3651 unregister_con_driver(csw);
3652}
3653
6db4063c 3654static int __init vtconsole_class_init(void)
3e795de7 3655{
6db4063c 3656 int i;
3e795de7 3657
6db4063c
AD		 3658 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3659 if (IS_ERR(vtconsole_class)) {
3660 printk(KERN_WARNING "Unable to create vt console class; "
3661 "errno = %ld\n", PTR_ERR(vtconsole_class));
3662 vtconsole_class = NULL;
3663 }
3e795de7 3664
6db4063c 3665 /* Add system drivers to sysfs */
3e795de7
AD		 3666 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3667 struct con_driver *con = &registered_con_driver[i];
3668
805952a8 3669 if (con->con && !con->dev) {
d81ed103 3670 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3671 MKDEV(0, con->node),
3672 NULL, "vtcon%i",
3673 con->node);
6db4063c 3674
805952a8 3675 if (IS_ERR(con->dev)) {
6db4063c 3676 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3677 "device for %s; errno = %ld\n",
3678 con->desc, PTR_ERR(con->dev));
3679 con->dev = NULL;
6db4063c 3680 } else {
805952a8 3681 vtconsole_init_device(con);
6db4063c 3682 }
3e795de7 3683 }
3e795de7
AD		 3684 }
3685
3e795de7
AD		 3686 return 0;
3687}
6db4063c 3688postcore_initcall(vtconsole_class_init);
3e795de7 3689
1da177e4
LT		 3690#endif
3691
3692/*
3693 * Screen blanking
3694 */
3695
403aac96 3696static int set_vesa_blanking(char __user *p)
1da177e4 3697{
403aac96
YY		 3698 unsigned int mode;
3699
3700 if (get_user(mode, p + 1))
3701 return -EFAULT;
3702
3703 vesa_blank_mode = (mode < 4) ? mode : 0;
3704 return 0;
1da177e4
LT		 3705}
3706
1da177e4
LT		 3707void do_blank_screen(int entering_gfx)
3708{
3709 struct vc_data *vc = vc_cons[fg_console].d;
3710 int i;
3711
3712 WARN_CONSOLE_UNLOCKED();
3713
3714 if (console_blanked) {
3715 if (blank_state == blank_vesa_wait) {
3716 blank_state = blank_off;
d060a321 3717 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3718 }
3719 return;
3720 }
1da177e4
LT		 3721
3722 /* entering graphics mode? */
3723 if (entering_gfx) {
3724 hide_cursor(vc);
3725 save_screen(vc);
3726 vc->vc_sw->con_blank(vc, -1, 1);
3727 console_blanked = fg_console + 1;
b6e8f00f 3728 blank_state = blank_off;
1da177e4
LT		 3729 set_origin(vc);
3730 return;
3731 }
3732
b6e8f00f 3733 if (blank_state != blank_normal_wait)
3734 return;
3735 blank_state = blank_off;
3736
1da177e4
LT		 3737 /* don't blank graphics */
3738 if (vc->vc_mode != KD_TEXT) {
3739 console_blanked = fg_console + 1;
3740 return;
3741 }
3742
3743 hide_cursor(vc);
3744 del_timer_sync(&console_timer);
3745 blank_timer_expired = 0;
3746
3747 save_screen(vc);
3748 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3749 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3750 console_blanked = fg_console + 1;
3751 if (i)
3752 set_origin(vc);
3753
3754 if (console_blank_hook && console_blank_hook(1))
3755 return;
3756
d060a321 3757 if (vesa_off_interval && vesa_blank_mode) {
030babac 3758 blank_state = blank_vesa_wait;
1da177e4
LT		 3759 mod_timer(&console_timer, jiffies + vesa_off_interval);
3760 }
8b92e87d 3761 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3762}
3763EXPORT_SYMBOL(do_blank_screen);
3764
3765/*
3766 * Called by timer as well as from vt_console_driver
3767 */
3768void do_unblank_screen(int leaving_gfx)
3769{
3770 struct vc_data *vc;
3771
3772 /* This should now always be called from a "sane" (read: can schedule)
3773 * context for the sake of the low level drivers, except in the special
3774 * case of oops_in_progress
3775 */
3776 if (!oops_in_progress)
3777 might_sleep();
3778
3779 WARN_CONSOLE_UNLOCKED();
3780
3781 ignore_poke = 0;
3782 if (!console_blanked)
3783 return;
3784 if (!vc_cons_allocated(fg_console)) {
3785 /* impossible */
3786 printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
3787 return;
3788 }
3789 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3790 /* Try to unblank in oops case too */
3791 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3792 return; /* but leave console_blanked != 0 */
3793
3794 if (blankinterval) {
f324edc8 3795 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3796 blank_state = blank_normal_wait;
3797 }
3798
3799 console_blanked = 0;
8fd4bd22 3800 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3801 /* Low-level driver cannot restore -> do it ourselves */
3802 update_screen(vc);
3803 if (console_blank_hook)
3804 console_blank_hook(0);
3805 set_palette(vc);
3806 set_cursor(vc);
8b92e87d 3807 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3808}
3809EXPORT_SYMBOL(do_unblank_screen);
3810
3811/*
3812 * This is called by the outside world to cause a forced unblank, mostly for
3813 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3814 * call it with 1 as an argument and so force a mode restore... that may kill
3815 * X or at least garbage the screen but would also make the Oops visible...
3816 */
3817void unblank_screen(void)
3818{
3819 do_unblank_screen(0);
3820}
3821
3822/*
70522e12 3823 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3824 * (console operations can still happen at irq time, but only from printk which
70522e12 3825 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3826 */
3827static void blank_screen_t(unsigned long dummy)
3828{
cc63b1e1 3829 if (unlikely(!keventd_up())) {
f324edc8 3830 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3831 return;
3832 }
1da177e4
LT		 3833 blank_timer_expired = 1;
3834 schedule_work(&console_work);
3835}
3836
3837void poke_blanked_console(void)
3838{
3839 WARN_CONSOLE_UNLOCKED();
3840
3841 /* Add this so we quickly catch whoever might call us in a non
3842 * safe context. Nowadays, unblank_screen() isn't to be called in
3843 * atomic contexts and is allowed to schedule (with the special case
3844 * of oops_in_progress, but that isn't of any concern for this
3845 * function. --BenH.
3846 */
3847 might_sleep();
3848
3849 /* This isn't perfectly race free, but a race here would be mostly harmless,
3850 * at worse, we'll do a spurrious blank and it's unlikely
3851 */
3852 del_timer(&console_timer);
3853 blank_timer_expired = 0;
3854
3855 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3856 return;
3857 if (console_blanked)
3858 unblank_screen();
3859 else if (blankinterval) {
f324edc8 3860 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3861 blank_state = blank_normal_wait;
3862 }
3863}
3864
3865/*
3866 * Palettes
3867 */
3868
3869static void set_palette(struct vc_data *vc)
3870{
3871 WARN_CONSOLE_UNLOCKED();
3872
3873 if (vc->vc_mode != KD_GRAPHICS)
3874 vc->vc_sw->con_set_palette(vc, color_table);
3875}
3876
3877static int set_get_cmap(unsigned char __user *arg, int set)
3878{
3879 int i, j, k;
3880
3881 WARN_CONSOLE_UNLOCKED();
3882
3883 for (i = 0; i < 16; i++)
3884 if (set) {
3885 get_user(default_red[i], arg++);
3886 get_user(default_grn[i], arg++);
3887 get_user(default_blu[i], arg++);
3888 } else {
3889 put_user(default_red[i], arg++);
3890 put_user(default_grn[i], arg++);
3891 put_user(default_blu[i], arg++);
3892 }
3893 if (set) {
3894 for (i = 0; i < MAX_NR_CONSOLES; i++)
3895 if (vc_cons_allocated(i)) {
3896 for (j = k = 0; j < 16; j++) {
3897 vc_cons[i].d->vc_palette[k++] = default_red[j];
3898 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3899 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3900 }
3901 set_palette(vc_cons[i].d);
3902 }
3903 }
3904 return 0;
3905}
3906
3907/*
3908 * Load palette into the DAC registers. arg points to a colour
3909 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3910 */
3911
3912int con_set_cmap(unsigned char __user *arg)
3913{
3914 int rc;
3915
3916 acquire_console_sem();
3917 rc = set_get_cmap (arg,1);
3918 release_console_sem();
3919
3920 return rc;
3921}
3922
3923int con_get_cmap(unsigned char __user *arg)
3924{
3925 int rc;
3926
3927 acquire_console_sem();
3928 rc = set_get_cmap (arg,0);
3929 release_console_sem();
3930
3931 return rc;
3932}
3933
3934void reset_palette(struct vc_data *vc)
3935{
3936 int j, k;
3937 for (j=k=0; j<16; j++) {
3938 vc->vc_palette[k++] = default_red[j];
3939 vc->vc_palette[k++] = default_grn[j];
3940 vc->vc_palette[k++] = default_blu[j];
3941 }
3942 set_palette(vc);
3943}
3944
3945/*
3946 * Font switching
3947 *
3948 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3949 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3950 * depending on width) reserved for each character which is kinda wasty, but
3951 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
3952 * is upto the actual low-level console-driver convert data into its favorite
3953 * format (maybe we should add a `fontoffset' field to the `display'
3954 * structure so we won't have to convert the fontdata all the time.
3955 * /Jes
3956 */
3957
3958#define max_font_size 65536
3959
3960static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3961{
3962 struct console_font font;
3963 int rc = -EINVAL;
3964 int c;
3965
3966 if (vc->vc_mode != KD_TEXT)
3967 return -EINVAL;
3968
3969 if (op->data) {
3970 font.data = kmalloc(max_font_size, GFP_KERNEL);
3971 if (!font.data)
3972 return -ENOMEM;
3973 } else
3974 font.data = NULL;
3975
3976 acquire_console_sem();
3977 if (vc->vc_sw->con_font_get)
3978 rc = vc->vc_sw->con_font_get(vc, &font);
3979 else
3980 rc = -ENOSYS;
3981 release_console_sem();
3982
3983 if (rc)
3984 goto out;
3985
3986 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 3987
1da177e4
LT		 3988 if (op->data && font.charcount > op->charcount)
3989 rc = -ENOSPC;
3990 if (!(op->flags & KD_FONT_FLAG_OLD)) {
3991 if (font.width > op->width || font.height > op->height)
3992 rc = -ENOSPC;
3993 } else {
3994 if (font.width != 8)
3995 rc = -EIO;
3996 else if ((op->height && font.height > op->height) ||
3997 font.height > 32)
3998 rc = -ENOSPC;
3999 }
4000 if (rc)
4001 goto out;
4002
4003 op->height = font.height;
4004 op->width = font.width;
4005 op->charcount = font.charcount;
4006
4007 if (op->data && copy_to_user(op->data, font.data, c))
4008 rc = -EFAULT;
4009
4010out:
4011 kfree(font.data);
4012 return rc;
4013}
4014
4015static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4016{
4017 struct console_font font;
4018 int rc = -EINVAL;
4019 int size;
4020
4021 if (vc->vc_mode != KD_TEXT)
4022 return -EINVAL;
4023 if (!op->data)
4024 return -EINVAL;
4025 if (op->charcount > 512)
4026 return -EINVAL;
4027 if (!op->height) { /* Need to guess font height [compat] */
4028 int h, i;
4029 u8 __user *charmap = op->data;
4030 u8 tmp;
4031
4032 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4033 so that we can get rid of this soon */
4034 if (!(op->flags & KD_FONT_FLAG_OLD))
4035 return -EINVAL;
4036 for (h = 32; h > 0; h--)
4037 for (i = 0; i < op->charcount; i++) {
4038 if (get_user(tmp, &charmap[32*i+h-1]))
4039 return -EFAULT;
4040 if (tmp)
4041 goto nonzero;
4042 }
4043 return -EINVAL;
4044 nonzero:
4045 op->height = h;
4046 }
4047 if (op->width <= 0 || op->width > 32 || op->height > 32)
4048 return -EINVAL;
4049 size = (op->width+7)/8 * 32 * op->charcount;
4050 if (size > max_font_size)
4051 return -ENOSPC;
4052 font.charcount = op->charcount;
4053 font.height = op->height;
4054 font.width = op->width;
9b71ca20
JL		 4055 font.data = memdup_user(op->data, size);
4056 if (IS_ERR(font.data))
4057 return PTR_ERR(font.data);
1da177e4
LT		 4058 acquire_console_sem();
4059 if (vc->vc_sw->con_font_set)
4060 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4061 else
4062 rc = -ENOSYS;
4063 release_console_sem();
4064 kfree(font.data);
4065 return rc;
4066}
4067
4068static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4069{
4070 struct console_font font = {.width = op->width, .height = op->height};
4071 char name[MAX_FONT_NAME];
4072 char *s = name;
4073 int rc;
4074
4075 if (vc->vc_mode != KD_TEXT)
4076 return -EINVAL;
4077
4078 if (!op->data)
4079 s = NULL;
4080 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4081 return -EFAULT;
4082 else
4083 name[MAX_FONT_NAME - 1] = 0;
4084
4085 acquire_console_sem();
4086 if (vc->vc_sw->con_font_default)
4087 rc = vc->vc_sw->con_font_default(vc, &font, s);
4088 else
4089 rc = -ENOSYS;
4090 release_console_sem();
4091 if (!rc) {
4092 op->width = font.width;
4093 op->height = font.height;
4094 }
4095 return rc;
4096}
4097
4098static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4099{
4100 int con = op->height;
4101 int rc;
4102
4103 if (vc->vc_mode != KD_TEXT)
4104 return -EINVAL;
4105
4106 acquire_console_sem();
4107 if (!vc->vc_sw->con_font_copy)
4108 rc = -ENOSYS;
4109 else if (con < 0 || !vc_cons_allocated(con))
4110 rc = -ENOTTY;
4111 else if (con == vc->vc_num) /* nothing to do */
4112 rc = 0;
4113 else
4114 rc = vc->vc_sw->con_font_copy(vc, con);
4115 release_console_sem();
4116 return rc;
4117}
4118
4119int con_font_op(struct vc_data *vc, struct console_font_op *op)
4120{
4121 switch (op->op) {
4122 case KD_FONT_OP_SET:
4123 return con_font_set(vc, op);
4124 case KD_FONT_OP_GET:
4125 return con_font_get(vc, op);
4126 case KD_FONT_OP_SET_DEFAULT:
4127 return con_font_default(vc, op);
4128 case KD_FONT_OP_COPY:
4129 return con_font_copy(vc, op);
4130 }
4131 return -ENOSYS;
4132}
4133
4134/*
4135 * Interface exported to selection and vcs.
4136 */
4137
4138/* used by selection */
4139u16 screen_glyph(struct vc_data *vc, int offset)
4140{
4141 u16 w = scr_readw(screenpos(vc, offset, 1));
4142 u16 c = w & 0xff;
4143
4144 if (w & vc->vc_hi_font_mask)
4145 c |= 0x100;
4146 return c;
4147}
f7511d5f 4148EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4149
4150/* used by vcs - note the word offset */
4151unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4152{
4153 return screenpos(vc, 2 * w_offset, viewed);
4154}
4155
4156void getconsxy(struct vc_data *vc, unsigned char *p)
4157{
4158 p[0] = vc->vc_x;
4159 p[1] = vc->vc_y;
4160}
4161
4162void putconsxy(struct vc_data *vc, unsigned char *p)
4163{
9477e260 4164 hide_cursor(vc);
1da177e4
LT		 4165 gotoxy(vc, p[0], p[1]);
4166 set_cursor(vc);
4167}
4168
4169u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4170{
4171 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4172 return softcursor_original;
4173 return scr_readw(org);
4174}
4175
4176void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4177{
4178 scr_writew(val, org);
4179 if ((unsigned long)org == vc->vc_pos) {
4180 softcursor_original = -1;
4181 add_softcursor(vc);
4182 }
4183}
4184
4185/*
4186 * Visible symbols for modules
4187 */
4188
4189EXPORT_SYMBOL(color_table);
4190EXPORT_SYMBOL(default_red);
4191EXPORT_SYMBOL(default_grn);
4192EXPORT_SYMBOL(default_blu);
4193EXPORT_SYMBOL(update_region);
4194EXPORT_SYMBOL(redraw_screen);
4195EXPORT_SYMBOL(vc_resize);
4196EXPORT_SYMBOL(fg_console);
4197EXPORT_SYMBOL(console_blank_hook);
4198EXPORT_SYMBOL(console_blanked);
4199EXPORT_SYMBOL(vc_cons);
f6c06b68 4200EXPORT_SYMBOL(global_cursor_default);
1da177e4
LT		 4201#ifndef VT_SINGLE_DRIVER
4202EXPORT_SYMBOL(take_over_console);
4203EXPORT_SYMBOL(give_up_console);
4204#endif
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