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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
[linux.git] / drivers / tty / vt / vt.c
CommitLineData
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>
92#include <linux/tiocl.h>
93#include <linux/kbd_kern.h>
94#include <linux/consolemap.h>
95#include <linux/timer.h>
96#include <linux/interrupt.h>
1da177e4 97#include <linux/workqueue.h>
1da177e4
LT		 98#include <linux/pm.h>
99#include <linux/font.h>
100#include <linux/bitops.h>
b293d758 101#include <linux/notifier.h>
d81ed103
AC		 102#include <linux/device.h>
103#include <linux/io.h>
1da177e4 104#include <asm/system.h>
d81ed103 105#include <linux/uaccess.h>
81d44507 106#include <linux/kdb.h>
74c807ce 107#include <linux/ctype.h>
1da177e4 108
3e795de7 109#define MAX_NR_CON_DRIVER 16
1da177e4 110
6db4063c 111#define CON_DRIVER_FLAG_MODULE 1
928e964f
AD		 112#define CON_DRIVER_FLAG_INIT 2
113#define CON_DRIVER_FLAG_ATTR 4
3e795de7
AD		 114
115struct con_driver {
116 const struct consw *con;
117 const char *desc;
805952a8 118 struct device *dev;
6db4063c 119 int node;
3e795de7
AD		 120 int first;
121 int last;
122 int flag;
123};
124
125static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
1da177e4
LT		 126const struct consw *conswitchp;
127
128/* A bitmap for codes <32. A bit of 1 indicates that the code
129 * corresponding to that bit number invokes some special action
130 * (such as cursor movement) and should not be displayed as a
131 * glyph unless the disp_ctrl mode is explicitly enabled.
132 */
133#define CTRL_ACTION 0x0d00ff81
134#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
135
136/*
137 * Here is the default bell parameters: 750HZ, 1/8th of a second
138 */
139#define DEFAULT_BELL_PITCH 750
140#define DEFAULT_BELL_DURATION (HZ/8)
141
1da177e4
LT		 142struct vc vc_cons [MAX_NR_CONSOLES];
143
144#ifndef VT_SINGLE_DRIVER
145static const struct consw *con_driver_map[MAX_NR_CONSOLES];
146#endif
147
148static int con_open(struct tty_struct *, struct file *);
149static void vc_init(struct vc_data *vc, unsigned int rows,
150 unsigned int cols, int do_clear);
151static void gotoxy(struct vc_data *vc, int new_x, int new_y);
152static void save_cur(struct vc_data *vc);
153static void reset_terminal(struct vc_data *vc, int do_clear);
154static void con_flush_chars(struct tty_struct *tty);
403aac96 155static int set_vesa_blanking(char __user *p);
1da177e4
LT		 156static void set_cursor(struct vc_data *vc);
157static void hide_cursor(struct vc_data *vc);
65f27f38 158static void console_callback(struct work_struct *ignored);
1da177e4
LT		 159static void blank_screen_t(unsigned long dummy);
160static void set_palette(struct vc_data *vc);
161
162static int printable; /* Is console ready for printing? */
77bf2bab 163int default_utf8 = true;
042f10ec 164module_param(default_utf8, int, S_IRUGO | S_IWUSR);
f6c06b68
MG		 165int global_cursor_default = -1;
166module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
1da177e4 167
9ea9a886
CL		 168static int cur_default = CUR_DEFAULT;
169module_param(cur_default, int, S_IRUGO | S_IWUSR);
170
1da177e4
LT		 171/*
172 * ignore_poke: don't unblank the screen when things are typed. This is
173 * mainly for the privacy of braille terminal users.
174 */
175static int ignore_poke;
176
177int do_poke_blanked_console;
178int console_blanked;
179
180static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
1da177e4 181static int vesa_off_interval;
f324edc8
DM		 182static int blankinterval = 10*60;
183core_param(consoleblank, blankinterval, int, 0444);
1da177e4 184
65f27f38 185static DECLARE_WORK(console_work, console_callback);
1da177e4
LT		 186
187/*
188 * fg_console is the current virtual console,
189 * last_console is the last used one,
190 * want_console is the console we want to switch to,
b45cfba4 191 * saved_* variants are for save/restore around kernel debugger enter/leave
1da177e4
LT		 192 */
193int fg_console;
194int last_console;
195int want_console = -1;
fed891c8
JW		 196static int saved_fg_console;
197static int saved_last_console;
198static int saved_want_console;
199static int saved_vc_mode;
beed5336 200static int saved_console_blanked;
1da177e4
LT		 201
202/*
203 * For each existing display, we have a pointer to console currently visible
204 * on that display, allowing consoles other than fg_console to be refreshed
205 * appropriately. Unless the low-level driver supplies its own display_fg
206 * variable, we use this one for the "master display".
207 */
208static struct vc_data *master_display_fg;
209
210/*
211 * Unfortunately, we need to delay tty echo when we're currently writing to the
212 * console since the code is (and always was) not re-entrant, so we schedule
213 * all flip requests to process context with schedule-task() and run it from
214 * console_callback().
215 */
216
217/*
218 * For the same reason, we defer scrollback to the console callback.
219 */
220static int scrollback_delta;
221
222/*
223 * Hook so that the power management routines can (un)blank
224 * the console on our behalf.
225 */
226int (*console_blank_hook)(int);
227
40565f19 228static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
1da177e4
LT		 229static int blank_state;
230static int blank_timer_expired;
231enum {
232 blank_off = 0,
233 blank_normal_wait,
234 blank_vesa_wait,
235};
236
fbc92a34
KS		 237/*
238 * /sys/class/tty/tty0/
239 *
240 * the attribute 'active' contains the name of the current vc
241 * console and it supports poll() to detect vc switches
242 */
243static struct device *tty0dev;
244
b293d758
ST		 245/*
246 * Notifier list for console events.
247 */
248static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
249
250int register_vt_notifier(struct notifier_block *nb)
251{
252 return atomic_notifier_chain_register(&vt_notifier_list, nb);
253}
254EXPORT_SYMBOL_GPL(register_vt_notifier);
255
256int unregister_vt_notifier(struct notifier_block *nb)
257{
258 return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
259}
260EXPORT_SYMBOL_GPL(unregister_vt_notifier);
261
262static void notify_write(struct vc_data *vc, unsigned int unicode)
263{
264 struct vt_notifier_param param = { .vc = vc, unicode = unicode };
265 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
266}
267
268static void notify_update(struct vc_data *vc)
269{
270 struct vt_notifier_param param = { .vc = vc };
271 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
272}
1da177e4
LT		 273/*
274 * Low-Level Functions
275 */
276
277#define IS_FG(vc) ((vc)->vc_num == fg_console)
278
279#ifdef VT_BUF_VRAM_ONLY
280#define DO_UPDATE(vc) 0
281#else
f700d6e5 282#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked)
1da177e4
LT		 283#endif
284
285static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
286{
287 unsigned short *p;
288
289 if (!viewed)
290 p = (unsigned short *)(vc->vc_origin + offset);
291 else if (!vc->vc_sw->con_screen_pos)
292 p = (unsigned short *)(vc->vc_visible_origin + offset);
293 else
294 p = vc->vc_sw->con_screen_pos(vc, offset);
295 return p;
296}
297
e33ac1c1 298/* Called from the keyboard irq path.. */
1da177e4
LT		 299static inline void scrolldelta(int lines)
300{
e33ac1c1
AC		 301 /* FIXME */
302 /* scrolldelta needs some kind of consistency lock, but the BKL was
303 and still is not protecting versus the scheduled back end */
1da177e4
LT		 304 scrollback_delta += lines;
305 schedule_console_callback();
306}
307
308void schedule_console_callback(void)
309{
310 schedule_work(&console_work);
311}
312
313static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
314{
315 unsigned short *d, *s;
316
317 if (t+nr >= b)
318 nr = b - t - 1;
319 if (b > vc->vc_rows || t >= b || nr < 1)
320 return;
321 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
322 return;
323 d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
324 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
325 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
386f40c8 326 scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
1da177e4
LT		 327 vc->vc_size_row * nr);
328}
329
330static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
331{
332 unsigned short *s;
333 unsigned int step;
334
335 if (t+nr >= b)
336 nr = b - t - 1;
337 if (b > vc->vc_rows || t >= b || nr < 1)
338 return;
339 if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
340 return;
341 s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
342 step = vc->vc_cols * nr;
343 scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
93f78da4 344 scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
1da177e4
LT		 345}
346
347static void do_update_region(struct vc_data *vc, unsigned long start, int count)
348{
349#ifndef VT_BUF_VRAM_ONLY
350 unsigned int xx, yy, offset;
351 u16 *p;
352
353 p = (u16 *) start;
354 if (!vc->vc_sw->con_getxy) {
355 offset = (start - vc->vc_origin) / 2;
356 xx = offset % vc->vc_cols;
357 yy = offset / vc->vc_cols;
358 } else {
359 int nxx, nyy;
360 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
361 xx = nxx; yy = nyy;
362 }
363 for(;;) {
364 u16 attrib = scr_readw(p) & 0xff00;
365 int startx = xx;
366 u16 *q = p;
367 while (xx < vc->vc_cols && count) {
368 if (attrib != (scr_readw(p) & 0xff00)) {
369 if (p > q)
370 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
371 startx = xx;
372 q = p;
373 attrib = scr_readw(p) & 0xff00;
374 }
375 p++;
376 xx++;
377 count--;
378 }
379 if (p > q)
380 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
381 if (!count)
382 break;
383 xx = 0;
384 yy++;
385 if (vc->vc_sw->con_getxy) {
386 p = (u16 *)start;
387 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
388 }
389 }
390#endif
391}
392
393void update_region(struct vc_data *vc, unsigned long start, int count)
394{
395 WARN_CONSOLE_UNLOCKED();
396
397 if (DO_UPDATE(vc)) {
398 hide_cursor(vc);
399 do_update_region(vc, start, count);
400 set_cursor(vc);
401 }
402}
403
404/* Structure of attributes is hardware-dependent */
405
fa6ce9ab
JE		 406static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
407 u8 _underline, u8 _reverse, u8 _italic)
1da177e4
LT		 408{
409 if (vc->vc_sw->con_build_attr)
fa6ce9ab
JE		 410 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
411 _blink, _underline, _reverse, _italic);
1da177e4
LT		 412
413#ifndef VT_BUF_VRAM_ONLY
414/*
415 * ++roman: I completely changed the attribute format for monochrome
416 * mode (!can_do_color). The formerly used MDA (monochrome display
417 * adapter) format didn't allow the combination of certain effects.
418 * Now the attribute is just a bit vector:
419 * Bit 0..1: intensity (0..2)
420 * Bit 2 : underline
421 * Bit 3 : reverse
422 * Bit 7 : blink
423 */
424 {
c9e587ab 425 u8 a = _color;
1da177e4
LT		 426 if (!vc->vc_can_do_color)
427 return _intensity |
fa6ce9ab 428 (_italic ? 2 : 0) |
1da177e4
LT		 429 (_underline ? 4 : 0) |
430 (_reverse ? 8 : 0) |
431 (_blink ? 0x80 : 0);
fa6ce9ab
JE		 432 if (_italic)
433 a = (a & 0xF0) | vc->vc_itcolor;
434 else if (_underline)
1da177e4
LT		 435 a = (a & 0xf0) | vc->vc_ulcolor;
436 else if (_intensity == 0)
437 a = (a & 0xf0) | vc->vc_ulcolor;
438 if (_reverse)
439 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
440 if (_blink)
441 a ^= 0x80;
442 if (_intensity == 2)
443 a ^= 0x08;
444 if (vc->vc_hi_font_mask == 0x100)
445 a <<= 1;
446 return a;
447 }
448#else
449 return 0;
450#endif
451}
452
453static void update_attr(struct vc_data *vc)
454{
fa6ce9ab
JE		 455 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
456 vc->vc_blink, vc->vc_underline,
457 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
458 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
1da177e4
LT		 459}
460
461/* Note: inverting the screen twice should revert to the original state */
462void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
463{
464 unsigned short *p;
465
466 WARN_CONSOLE_UNLOCKED();
467
468 count /= 2;
469 p = screenpos(vc, offset, viewed);
470 if (vc->vc_sw->con_invert_region)
471 vc->vc_sw->con_invert_region(vc, p, count);
472#ifndef VT_BUF_VRAM_ONLY
473 else {
474 u16 *q = p;
475 int cnt = count;
476 u16 a;
477
478 if (!vc->vc_can_do_color) {
479 while (cnt--) {
480 a = scr_readw(q);
481 a ^= 0x0800;
482 scr_writew(a, q);
483 q++;
484 }
485 } else if (vc->vc_hi_font_mask == 0x100) {
486 while (cnt--) {
487 a = scr_readw(q);
488 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
489 scr_writew(a, q);
490 q++;
491 }
492 } else {
493 while (cnt--) {
494 a = scr_readw(q);
495 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
496 scr_writew(a, q);
497 q++;
498 }
499 }
500 }
501#endif
502 if (DO_UPDATE(vc))
503 do_update_region(vc, (unsigned long) p, count);
504}
505
506/* used by selection: complement pointer position */
507void complement_pos(struct vc_data *vc, int offset)
508{
414edcd3 509 static int old_offset = -1;
1da177e4
LT		 510 static unsigned short old;
511 static unsigned short oldx, oldy;
512
513 WARN_CONSOLE_UNLOCKED();
514
414edcd3
AD		 515 if (old_offset != -1 && old_offset >= 0 &&
516 old_offset < vc->vc_screenbuf_size) {
517 scr_writew(old, screenpos(vc, old_offset, 1));
1da177e4
LT		 518 if (DO_UPDATE(vc))
519 vc->vc_sw->con_putc(vc, old, oldy, oldx);
520 }
414edcd3
AD		 521
522 old_offset = offset;
523
524 if (offset != -1 && offset >= 0 &&
525 offset < vc->vc_screenbuf_size) {
1da177e4 526 unsigned short new;
414edcd3 527 unsigned short *p;
1da177e4
LT		 528 p = screenpos(vc, offset, 1);
529 old = scr_readw(p);
530 new = old ^ vc->vc_complement_mask;
531 scr_writew(new, p);
532 if (DO_UPDATE(vc)) {
533 oldx = (offset >> 1) % vc->vc_cols;
534 oldy = (offset >> 1) / vc->vc_cols;
535 vc->vc_sw->con_putc(vc, new, oldy, oldx);
536 }
537 }
414edcd3 538
1da177e4
LT		 539}
540
541static void insert_char(struct vc_data *vc, unsigned int nr)
542{
543 unsigned short *p, *q = (unsigned short *)vc->vc_pos;
544
545 p = q + vc->vc_cols - nr - vc->vc_x;
546 while (--p >= q)
547 scr_writew(scr_readw(p), p + nr);
548 scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
549 vc->vc_need_wrap = 0;
550 if (DO_UPDATE(vc)) {
551 unsigned short oldattr = vc->vc_attr;
552 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
553 vc->vc_cols - vc->vc_x - nr);
554 vc->vc_attr = vc->vc_video_erase_char >> 8;
555 while (nr--)
556 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
557 vc->vc_attr = oldattr;
558 }
559}
560
561static void delete_char(struct vc_data *vc, unsigned int nr)
562{
563 unsigned int i = vc->vc_x;
564 unsigned short *p = (unsigned short *)vc->vc_pos;
565
566 while (++i <= vc->vc_cols - nr) {
567 scr_writew(scr_readw(p+nr), p);
568 p++;
569 }
570 scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
571 vc->vc_need_wrap = 0;
572 if (DO_UPDATE(vc)) {
573 unsigned short oldattr = vc->vc_attr;
574 vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
575 vc->vc_cols - vc->vc_x - nr);
576 vc->vc_attr = vc->vc_video_erase_char >> 8;
577 while (nr--)
578 vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
579 vc->vc_cols - 1 - nr);
580 vc->vc_attr = oldattr;
581 }
582}
583
584static int softcursor_original;
585
586static void add_softcursor(struct vc_data *vc)
587{
588 int i = scr_readw((u16 *) vc->vc_pos);
589 u32 type = vc->vc_cursor_type;
590
591 if (! (type & 0x10)) return;
592 if (softcursor_original != -1) return;
593 softcursor_original = i;
594 i |= ((type >> 8) & 0xff00 );
595 i ^= ((type) & 0xff00 );
596 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
597 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
598 scr_writew(i, (u16 *) vc->vc_pos);
599 if (DO_UPDATE(vc))
600 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
601}
602
603static void hide_softcursor(struct vc_data *vc)
604{
605 if (softcursor_original != -1) {
606 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
607 if (DO_UPDATE(vc))
608 vc->vc_sw->con_putc(vc, softcursor_original,
609 vc->vc_y, vc->vc_x);
610 softcursor_original = -1;
611 }
612}
613
614static void hide_cursor(struct vc_data *vc)
615{
616 if (vc == sel_cons)
617 clear_selection();
618 vc->vc_sw->con_cursor(vc, CM_ERASE);
619 hide_softcursor(vc);
620}
621
622static void set_cursor(struct vc_data *vc)
623{
624 if (!IS_FG(vc) || console_blanked ||
625 vc->vc_mode == KD_GRAPHICS)
626 return;
627 if (vc->vc_deccm) {
628 if (vc == sel_cons)
629 clear_selection();
630 add_softcursor(vc);
631 if ((vc->vc_cursor_type & 0x0f) != 1)
632 vc->vc_sw->con_cursor(vc, CM_DRAW);
633 } else
634 hide_cursor(vc);
635}
636
637static void set_origin(struct vc_data *vc)
638{
639 WARN_CONSOLE_UNLOCKED();
640
641 if (!CON_IS_VISIBLE(vc) ||
642 !vc->vc_sw->con_set_origin ||
643 !vc->vc_sw->con_set_origin(vc))
644 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
645 vc->vc_visible_origin = vc->vc_origin;
646 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
647 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
648}
649
650static inline void save_screen(struct vc_data *vc)
651{
652 WARN_CONSOLE_UNLOCKED();
653
654 if (vc->vc_sw->con_save_screen)
655 vc->vc_sw->con_save_screen(vc);
656}
657
658/*
659 * Redrawing of screen
660 */
661
662static void clear_buffer_attributes(struct vc_data *vc)
663{
664 unsigned short *p = (unsigned short *)vc->vc_origin;
665 int count = vc->vc_screenbuf_size / 2;
666 int mask = vc->vc_hi_font_mask | 0xff;
667
668 for (; count > 0; count--, p++) {
669 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
670 }
671}
672
673void redraw_screen(struct vc_data *vc, int is_switch)
674{
675 int redraw = 0;
676
677 WARN_CONSOLE_UNLOCKED();
678
679 if (!vc) {
680 /* strange ... */
681 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
682 return;
683 }
684
685 if (is_switch) {
686 struct vc_data *old_vc = vc_cons[fg_console].d;
687 if (old_vc == vc)
688 return;
689 if (!CON_IS_VISIBLE(vc))
690 redraw = 1;
691 *vc->vc_display_fg = vc;
692 fg_console = vc->vc_num;
693 hide_cursor(old_vc);
694 if (!CON_IS_VISIBLE(old_vc)) {
695 save_screen(old_vc);
696 set_origin(old_vc);
697 }
fbc92a34
KS		 698 if (tty0dev)
699 sysfs_notify(&tty0dev->kobj, NULL, "active");
1da177e4
LT		 700 } else {
701 hide_cursor(vc);
702 redraw = 1;
703 }
704
705 if (redraw) {
706 int update;
707 int old_was_color = vc->vc_can_do_color;
708
709 set_origin(vc);
710 update = vc->vc_sw->con_switch(vc);
711 set_palette(vc);
712 /*
713 * If console changed from mono<->color, the best we can do
714 * is to clear the buffer attributes. As it currently stands,
715 * rebuilding new attributes from the old buffer is not doable
716 * without overly complex code.
717 */
718 if (old_was_color != vc->vc_can_do_color) {
719 update_attr(vc);
720 clear_buffer_attributes(vc);
721 }
8fd4bd22
JB		 722
723 /* Forcibly update if we're panicing */
724 if ((update && vc->vc_mode != KD_GRAPHICS) ||
725 vt_force_oops_output(vc))
1da177e4
LT		 726 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
727 }
728 set_cursor(vc);
729 if (is_switch) {
730 set_leds();
731 compute_shiftstate();
8182ec49 732 notify_update(vc);
1da177e4
LT		 733 }
734}
735
736/*
737 * Allocation, freeing and resizing of VTs.
738 */
739
740int vc_cons_allocated(unsigned int i)
741{
742 return (i < MAX_NR_CONSOLES && vc_cons[i].d);
743}
744
745static void visual_init(struct vc_data *vc, int num, int init)
746{
747 /* ++Geert: vc->vc_sw->con_init determines console size */
748 if (vc->vc_sw)
749 module_put(vc->vc_sw->owner);
750 vc->vc_sw = conswitchp;
751#ifndef VT_SINGLE_DRIVER
752 if (con_driver_map[num])
753 vc->vc_sw = con_driver_map[num];
754#endif
755 __module_get(vc->vc_sw->owner);
756 vc->vc_num = num;
757 vc->vc_display_fg = &master_display_fg;
758 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
759 vc->vc_uni_pagedir = 0;
760 vc->vc_hi_font_mask = 0;
761 vc->vc_complement_mask = 0;
762 vc->vc_can_do_color = 0;
8fd4bd22 763 vc->vc_panic_force_write = false;
1da177e4
LT		 764 vc->vc_sw->con_init(vc, init);
765 if (!vc->vc_complement_mask)
766 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
767 vc->vc_s_complement_mask = vc->vc_complement_mask;
768 vc->vc_size_row = vc->vc_cols << 1;
769 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
770}
771
772int vc_allocate(unsigned int currcons) /* return 0 on success */
773{
774 WARN_CONSOLE_UNLOCKED();
775
776 if (currcons >= MAX_NR_CONSOLES)
777 return -ENXIO;
778 if (!vc_cons[currcons].d) {
779 struct vc_data *vc;
b293d758 780 struct vt_notifier_param param;
1da177e4
LT		 781
782 /* prevent users from taking too much memory */
783 if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
784 return -EPERM;
785
786 /* due to the granularity of kmalloc, we waste some memory here */
787 /* the alloc is done in two steps, to optimize the common situation
788 of a 25x80 console (structsize=216, screenbuf_size=4000) */
789 /* although the numbers above are not valid since long ago, the
790 point is still up-to-date and the comment still has its value
791 even if only as a historical artifact. --mj, July 1998 */
b293d758 792 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1da177e4
LT		 793 if (!vc)
794 return -ENOMEM;
1da177e4 795 vc_cons[currcons].d = vc;
ff917ba4 796 tty_port_init(&vc->port);
c2c88f10 797 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1da177e4
LT		 798 visual_init(vc, currcons, 1);
799 if (!*vc->vc_uni_pagedir_loc)
800 con_set_default_unimap(vc);
5c9228f0 801 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1da177e4
LT		 802 if (!vc->vc_screenbuf) {
803 kfree(vc);
804 vc_cons[currcons].d = NULL;
805 return -ENOMEM;
806 }
f6c06b68
MG		 807
808 /* If no drivers have overridden us and the user didn't pass a
809 boot option, default to displaying the cursor */
810 if (global_cursor_default == -1)
811 global_cursor_default = 1;
812
1da177e4 813 vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
4995f8ef 814 vcs_make_sysfs(currcons);
b293d758 815 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1da177e4
LT		 816 }
817 return 0;
818}
819
e400b6ec
AD		 820static inline int resize_screen(struct vc_data *vc, int width, int height,
821 int user)
1da177e4
LT		 822{
823 /* Resizes the resolution of the display adapater */
824 int err = 0;
825
826 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
e400b6ec
AD		 827 err = vc->vc_sw->con_resize(vc, width, height, user);
828
1da177e4
LT		 829 return err;
830}
831
832/*
833 * Change # of rows and columns (0 means unchanged/the size of fg_console)
834 * [this is to be used together with some user program
835 * like resize that changes the hardware videomode]
836 */
837#define VC_RESIZE_MAXCOL (32767)
838#define VC_RESIZE_MAXROW (32767)
8c9a9dd0
AC		 839
840/**
841 * vc_do_resize - resizing method for the tty
842 * @tty: tty being resized
843 * @real_tty: real tty (different to tty if a pty/tty pair)
844 * @vc: virtual console private data
845 * @cols: columns
846 * @lines: lines
847 *
848 * Resize a virtual console, clipping according to the actual constraints.
849 * If the caller passes a tty structure then update the termios winsize
3ad2f3fb 850 * information and perform any necessary signal handling.
8c9a9dd0
AC		 851 *
852 * Caller must hold the console semaphore. Takes the termios mutex and
853 * ctrl_lock of the tty IFF a tty is passed.
854 */
855
fc6f6238
AC		 856static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
857 unsigned int cols, unsigned int lines)
1da177e4
LT		 858{
859 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
9e0ba741 860 unsigned long end;
1da177e4
LT		 861 unsigned int old_cols, old_rows, old_row_size, old_screen_size;
862 unsigned int new_cols, new_rows, new_row_size, new_screen_size;
9e0ba741 863 unsigned int user;
1da177e4
LT		 864 unsigned short *newscreen;
865
866 WARN_CONSOLE_UNLOCKED();
867
868 if (!vc)
869 return -ENXIO;
870
e400b6ec
AD		 871 user = vc->vc_resize_user;
872 vc->vc_resize_user = 0;
873
1da177e4
LT		 874 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
875 return -EINVAL;
876
877 new_cols = (cols ? cols : vc->vc_cols);
878 new_rows = (lines ? lines : vc->vc_rows);
879 new_row_size = new_cols << 1;
880 new_screen_size = new_row_size * new_rows;
881
882 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
883 return 0;
884
5cbded58 885 newscreen = kmalloc(new_screen_size, GFP_USER);
1da177e4
LT		 886 if (!newscreen)
887 return -ENOMEM;
888
889 old_rows = vc->vc_rows;
890 old_cols = vc->vc_cols;
891 old_row_size = vc->vc_size_row;
892 old_screen_size = vc->vc_screenbuf_size;
893
e400b6ec 894 err = resize_screen(vc, new_cols, new_rows, user);
1da177e4
LT		 895 if (err) {
896 kfree(newscreen);
897 return err;
898 }
899
900 vc->vc_rows = new_rows;
901 vc->vc_cols = new_cols;
902 vc->vc_size_row = new_row_size;
903 vc->vc_screenbuf_size = new_screen_size;
904
905 rlth = min(old_row_size, new_row_size);
906 rrem = new_row_size - rlth;
907 old_origin = vc->vc_origin;
908 new_origin = (long) newscreen;
909 new_scr_end = new_origin + new_screen_size;
3b41dc1a
AD		 910
911 if (vc->vc_y > new_rows) {
912 if (old_rows - vc->vc_y < new_rows) {
913 /*
914 * Cursor near the bottom, copy contents from the
915 * bottom of buffer
916 */
917 old_origin += (old_rows - new_rows) * old_row_size;
3b41dc1a
AD		 918 } else {
919 /*
920 * Cursor is in no man's land, copy 1/2 screenful
921 * from the top and bottom of cursor position
922 */
923 old_origin += (vc->vc_y - new_rows/2) * old_row_size;
3b41dc1a 924 }
9fc2b2d0
FJ		 925 }
926
927 end = old_origin + old_row_size * min(old_rows, new_rows);
1da177e4
LT		 928
929 update_attr(vc);
930
3b41dc1a
AD		 931 while (old_origin < end) {
932 scr_memcpyw((unsigned short *) new_origin,
933 (unsigned short *) old_origin, rlth);
1da177e4 934 if (rrem)
3b41dc1a
AD		 935 scr_memsetw((void *)(new_origin + rlth),
936 vc->vc_video_erase_char, rrem);
1da177e4
LT		 937 old_origin += old_row_size;
938 new_origin += new_row_size;
939 }
940 if (new_scr_end > new_origin)
3b41dc1a
AD		 941 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
942 new_scr_end - new_origin);
5c9228f0 943 kfree(vc->vc_screenbuf);
1da177e4 944 vc->vc_screenbuf = newscreen;
1da177e4
LT		 945 vc->vc_screenbuf_size = new_screen_size;
946 set_origin(vc);
947
948 /* do part of a reset_terminal() */
949 vc->vc_top = 0;
950 vc->vc_bottom = vc->vc_rows;
951 gotoxy(vc, vc->vc_x, vc->vc_y);
952 save_cur(vc);
953
8c9a9dd0
AC		 954 if (tty) {
955 /* Rewrite the requested winsize data with the actual
956 resulting sizes */
957 struct winsize ws;
1da177e4
LT		 958 memset(&ws, 0, sizeof(ws));
959 ws.ws_row = vc->vc_rows;
960 ws.ws_col = vc->vc_cols;
961 ws.ws_ypixel = vc->vc_scan_lines;
fc6f6238 962 tty_do_resize(tty, &ws);
1da177e4
LT		 963 }
964
965 if (CON_IS_VISIBLE(vc))
966 update_screen(vc);
8b92e87d 967 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1da177e4
LT		 968 return err;
969}
970
8c9a9dd0
AC		 971/**
972 * vc_resize - resize a VT
973 * @vc: virtual console
974 * @cols: columns
975 * @rows: rows
976 *
977 * Resize a virtual console as seen from the console end of things. We
978 * use the common vc_do_resize methods to update the structures. The
979 * caller must hold the console sem to protect console internals and
8ce73264 980 * vc->port.tty
8c9a9dd0
AC		 981 */
982
983int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
984{
8ce73264 985 return vc_do_resize(vc->port.tty, vc, cols, rows);
8c9a9dd0
AC		 986}
987
988/**
989 * vt_resize - resize a VT
990 * @tty: tty to resize
8c9a9dd0
AC		 991 * @ws: winsize attributes
992 *
993 * Resize a virtual terminal. This is called by the tty layer as we
994 * register our own handler for resizing. The mutual helper does all
995 * the actual work.
996 *
997 * Takes the console sem and the called methods then take the tty
998 * termios_mutex and the tty ctrl_lock in that order.
999 */
da2bdf9a 1000static int vt_resize(struct tty_struct *tty, struct winsize *ws)
ca9bda00 1001{
8c9a9dd0
AC		 1002 struct vc_data *vc = tty->driver_data;
1003 int ret;
ca9bda00 1004
ac751efa 1005 console_lock();
fc6f6238 1006 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
ac751efa 1007 console_unlock();
8c9a9dd0 1008 return ret;
ca9bda00 1009}
1da177e4 1010
ca9bda00 1011void vc_deallocate(unsigned int currcons)
1da177e4
LT		 1012{
1013 WARN_CONSOLE_UNLOCKED();
1014
1015 if (vc_cons_allocated(currcons)) {
1016 struct vc_data *vc = vc_cons[currcons].d;
b293d758 1017 struct vt_notifier_param param = { .vc = vc };
4995f8ef 1018
b293d758 1019 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
4995f8ef 1020 vcs_remove_sysfs(currcons);
1da177e4 1021 vc->vc_sw->con_deinit(vc);
bde0d2c9 1022 put_pid(vc->vt_pid);
d459ec0b 1023 module_put(vc->vc_sw->owner);
5c9228f0 1024 kfree(vc->vc_screenbuf);
1da177e4
LT		 1025 if (currcons >= MIN_NR_CONSOLES)
1026 kfree(vc);
1027 vc_cons[currcons].d = NULL;
1028 }
1029}
1030
1031/*
1032 * VT102 emulator
1033 */
1034
1035#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1036#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1037#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
1038
1039#define decarm VC_REPEAT
1040#define decckm VC_CKMODE
1041#define kbdapplic VC_APPLIC
1042#define lnm VC_CRLF
1043
1044/*
1045 * this is what the terminal answers to a ESC-Z or csi0c query.
1046 */
1047#define VT100ID "\033[?1;2c"
1048#define VT102ID "\033[?6c"
1049
1050unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1051 8,12,10,14, 9,13,11,15 };
1052
1053/* the default colour table, for VGA+ colour systems */
1054int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1055 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1056int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1057 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1058int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1059 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1060
1c2bbe6a
JE		 1061module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1062module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1063module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1064
1da177e4
LT		 1065/*
1066 * gotoxy() must verify all boundaries, because the arguments
1067 * might also be negative. If the given position is out of
1068 * bounds, the cursor is placed at the nearest margin.
1069 */
1070static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1071{
1072 int min_y, max_y;
1073
1074 if (new_x < 0)
1075 vc->vc_x = 0;
1076 else {
1077 if (new_x >= vc->vc_cols)
1078 vc->vc_x = vc->vc_cols - 1;
1079 else
1080 vc->vc_x = new_x;
1081 }
1082
1083 if (vc->vc_decom) {
1084 min_y = vc->vc_top;
1085 max_y = vc->vc_bottom;
1086 } else {
1087 min_y = 0;
1088 max_y = vc->vc_rows;
1089 }
1090 if (new_y < min_y)
1091 vc->vc_y = min_y;
1092 else if (new_y >= max_y)
1093 vc->vc_y = max_y - 1;
1094 else
1095 vc->vc_y = new_y;
1096 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1097 vc->vc_need_wrap = 0;
1098}
1099
1100/* for absolute user moves, when decom is set */
1101static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1102{
1103 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1104}
1105
1106void scrollback(struct vc_data *vc, int lines)
1107{
1108 if (!lines)
1109 lines = vc->vc_rows / 2;
1110 scrolldelta(-lines);
1111}
1112
1113void scrollfront(struct vc_data *vc, int lines)
1114{
1115 if (!lines)
1116 lines = vc->vc_rows / 2;
1117 scrolldelta(lines);
1118}
1119
1120static void lf(struct vc_data *vc)
1121{
1122 /* don't scroll if above bottom of scrolling region, or
1123 * if below scrolling region
1124 */
1125 if (vc->vc_y + 1 == vc->vc_bottom)
1126 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1127 else if (vc->vc_y < vc->vc_rows - 1) {
1128 vc->vc_y++;
1129 vc->vc_pos += vc->vc_size_row;
1130 }
1131 vc->vc_need_wrap = 0;
b293d758 1132 notify_write(vc, '\n');
1da177e4
LT		 1133}
1134
1135static void ri(struct vc_data *vc)
1136{
1137 /* don't scroll if below top of scrolling region, or
1138 * if above scrolling region
1139 */
1140 if (vc->vc_y == vc->vc_top)
1141 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1142 else if (vc->vc_y > 0) {
1143 vc->vc_y--;
1144 vc->vc_pos -= vc->vc_size_row;
1145 }
1146 vc->vc_need_wrap = 0;
1147}
1148
1149static inline void cr(struct vc_data *vc)
1150{
1151 vc->vc_pos -= vc->vc_x << 1;
1152 vc->vc_need_wrap = vc->vc_x = 0;
b293d758 1153 notify_write(vc, '\r');
1da177e4
LT		 1154}
1155
1156static inline void bs(struct vc_data *vc)
1157{
1158 if (vc->vc_x) {
1159 vc->vc_pos -= 2;
1160 vc->vc_x--;
1161 vc->vc_need_wrap = 0;
b293d758 1162 notify_write(vc, '\b');
1da177e4
LT		 1163 }
1164}
1165
1166static inline void del(struct vc_data *vc)
1167{
1168 /* ignored */
1169}
1170
1171static void csi_J(struct vc_data *vc, int vpar)
1172{
1173 unsigned int count;
1174 unsigned short * start;
1175
1176 switch (vpar) {
1177 case 0: /* erase from cursor to end of display */
1178 count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1179 start = (unsigned short *)vc->vc_pos;
1180 if (DO_UPDATE(vc)) {
1181 /* do in two stages */
1182 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1183 vc->vc_cols - vc->vc_x);
1184 vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
1185 vc->vc_rows - vc->vc_y - 1,
1186 vc->vc_cols);
1187 }
1188 break;
1189 case 1: /* erase from start to cursor */
1190 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1191 start = (unsigned short *)vc->vc_origin;
1192 if (DO_UPDATE(vc)) {
1193 /* do in two stages */
1194 vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
1195 vc->vc_cols);
1196 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1197 vc->vc_x + 1);
1198 }
1199 break;
1200 case 2: /* erase whole display */
1201 count = vc->vc_cols * vc->vc_rows;
1202 start = (unsigned short *)vc->vc_origin;
1203 if (DO_UPDATE(vc))
1204 vc->vc_sw->con_clear(vc, 0, 0,
1205 vc->vc_rows,
1206 vc->vc_cols);
1207 break;
1208 default:
1209 return;
1210 }
1211 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1212 vc->vc_need_wrap = 0;
1213}
1214
1215static void csi_K(struct vc_data *vc, int vpar)
1216{
1217 unsigned int count;
1218 unsigned short * start;
1219
1220 switch (vpar) {
1221 case 0: /* erase from cursor to end of line */
1222 count = vc->vc_cols - vc->vc_x;
1223 start = (unsigned short *)vc->vc_pos;
1224 if (DO_UPDATE(vc))
1225 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
1226 vc->vc_cols - vc->vc_x);
1227 break;
1228 case 1: /* erase from start of line to cursor */
1229 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1230 count = vc->vc_x + 1;
1231 if (DO_UPDATE(vc))
1232 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1233 vc->vc_x + 1);
1234 break;
1235 case 2: /* erase whole line */
1236 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1237 count = vc->vc_cols;
1238 if (DO_UPDATE(vc))
1239 vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
1240 vc->vc_cols);
1241 break;
1242 default:
1243 return;
1244 }
1245 scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1246 vc->vc_need_wrap = 0;
1247}
1248
1249static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1250{ /* not vt100? */
1251 int count;
1252
1253 if (!vpar)
1254 vpar++;
1255 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1256
1257 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1258 if (DO_UPDATE(vc))
1259 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1260 vc->vc_need_wrap = 0;
1261}
1262
1263static void default_attr(struct vc_data *vc)
1264{
1265 vc->vc_intensity = 1;
fa6ce9ab 1266 vc->vc_italic = 0;
1da177e4
LT		 1267 vc->vc_underline = 0;
1268 vc->vc_reverse = 0;
1269 vc->vc_blink = 0;
1270 vc->vc_color = vc->vc_def_color;
1271}
1272
ac751efa 1273/* console_lock is held */
1da177e4
LT		 1274static void csi_m(struct vc_data *vc)
1275{
1276 int i;
1277
1278 for (i = 0; i <= vc->vc_npar; i++)
1279 switch (vc->vc_par[i]) {
1280 case 0: /* all attributes off */
1281 default_attr(vc);
1282 break;
1283 case 1:
1284 vc->vc_intensity = 2;
1285 break;
1286 case 2:
1287 vc->vc_intensity = 0;
1288 break;
fa6ce9ab
JE		 1289 case 3:
1290 vc->vc_italic = 1;
1291 break;
1da177e4
LT		 1292 case 4:
1293 vc->vc_underline = 1;
1294 break;
1295 case 5:
1296 vc->vc_blink = 1;
1297 break;
1298 case 7:
1299 vc->vc_reverse = 1;
1300 break;
1301 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1302 * Select primary font, don't display
1303 * control chars if defined, don't set
1304 * bit 8 on output.
1305 */
1306 vc->vc_translate = set_translate(vc->vc_charset == 0
1307 ? vc->vc_G0_charset
1308 : vc->vc_G1_charset, vc);
1309 vc->vc_disp_ctrl = 0;
1310 vc->vc_toggle_meta = 0;
1311 break;
1312 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1313 * Select first alternate font, lets
1314 * chars < 32 be displayed as ROM chars.
1315 */
1316 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1317 vc->vc_disp_ctrl = 1;
1318 vc->vc_toggle_meta = 0;
1319 break;
1320 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1321 * Select second alternate font, toggle
1322 * high bit before displaying as ROM char.
1323 */
1324 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1325 vc->vc_disp_ctrl = 1;
1326 vc->vc_toggle_meta = 1;
1327 break;
1328 case 21:
1329 case 22:
1330 vc->vc_intensity = 1;
1331 break;
fa6ce9ab
JE		 1332 case 23:
1333 vc->vc_italic = 0;
1334 break;
1da177e4
LT		 1335 case 24:
1336 vc->vc_underline = 0;
1337 break;
1338 case 25:
1339 vc->vc_blink = 0;
1340 break;
1341 case 27:
1342 vc->vc_reverse = 0;
1343 break;
1344 case 38: /* ANSI X3.64-1979 (SCO-ish?)
1345 * Enables underscore, white foreground
1346 * with white underscore (Linux - use
1347 * default foreground).
1348 */
1349 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1350 vc->vc_underline = 1;
1351 break;
1352 case 39: /* ANSI X3.64-1979 (SCO-ish?)
1353 * Disable underline option.
1354 * Reset colour to default? It did this
1355 * before...
1356 */
1357 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1358 vc->vc_underline = 0;
1359 break;
1360 case 49:
1361 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1362 break;
1363 default:
1364 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1365 vc->vc_color = color_table[vc->vc_par[i] - 30]
1366 | (vc->vc_color & 0xf0);
1367 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1368 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1369 | (vc->vc_color & 0x0f);
1370 break;
1371 }
1372 update_attr(vc);
1373}
1374
1375static void respond_string(const char *p, struct tty_struct *tty)
1376{
1377 while (*p) {
1378 tty_insert_flip_char(tty, *p, 0);
1379 p++;
1380 }
1381 con_schedule_flip(tty);
1382}
1383
1384static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1385{
1386 char buf[40];
1387
1388 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1389 respond_string(buf, tty);
1390}
1391
1392static inline void status_report(struct tty_struct *tty)
1393{
1394 respond_string("\033[0n", tty); /* Terminal ok */
1395}
1396
1397static inline void respond_ID(struct tty_struct * tty)
1398{
1399 respond_string(VT102ID, tty);
1400}
1401
1402void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1403{
1404 char buf[8];
1405
1406 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1407 (char)('!' + mry));
1408 respond_string(buf, tty);
1409}
1410
1411/* invoked via ioctl(TIOCLINUX) and through set_selection */
1412int mouse_reporting(void)
1413{
1414 return vc_cons[fg_console].d->vc_report_mouse;
1415}
1416
ac751efa 1417/* console_lock is held */
1da177e4
LT		 1418static void set_mode(struct vc_data *vc, int on_off)
1419{
1420 int i;
1421
1422 for (i = 0; i <= vc->vc_npar; i++)
1423 if (vc->vc_ques) {
1424 switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1425 case 1: /* Cursor keys send ^[Ox/^[[x */
1426 if (on_off)
1427 set_kbd(vc, decckm);
1428 else
1429 clr_kbd(vc, decckm);
1430 break;
1431 case 3: /* 80/132 mode switch unimplemented */
1432 vc->vc_deccolm = on_off;
1433#if 0
1434 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1435 /* this alone does not suffice; some user mode
1436 utility has to change the hardware regs */
1437#endif
1438 break;
1439 case 5: /* Inverted screen on/off */
1440 if (vc->vc_decscnm != on_off) {
1441 vc->vc_decscnm = on_off;
1442 invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1443 update_attr(vc);
1444 }
1445 break;
1446 case 6: /* Origin relative/absolute */
1447 vc->vc_decom = on_off;
1448 gotoxay(vc, 0, 0);
1449 break;
1450 case 7: /* Autowrap on/off */
1451 vc->vc_decawm = on_off;
1452 break;
1453 case 8: /* Autorepeat on/off */
1454 if (on_off)
1455 set_kbd(vc, decarm);
1456 else
1457 clr_kbd(vc, decarm);
1458 break;
1459 case 9:
1460 vc->vc_report_mouse = on_off ? 1 : 0;
1461 break;
1462 case 25: /* Cursor on/off */
1463 vc->vc_deccm = on_off;
1464 break;
1465 case 1000:
1466 vc->vc_report_mouse = on_off ? 2 : 0;
1467 break;
1468 }
1469 } else {
1470 switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1471 case 3: /* Monitor (display ctrls) */
1472 vc->vc_disp_ctrl = on_off;
1473 break;
1474 case 4: /* Insert Mode on/off */
1475 vc->vc_decim = on_off;
1476 break;
1477 case 20: /* Lf, Enter == CrLf/Lf */
1478 if (on_off)
1479 set_kbd(vc, lnm);
1480 else
1481 clr_kbd(vc, lnm);
1482 break;
1483 }
1484 }
1485}
1486
ac751efa 1487/* console_lock is held */
1da177e4
LT		 1488static void setterm_command(struct vc_data *vc)
1489{
1490 switch(vc->vc_par[0]) {
1491 case 1: /* set color for underline mode */
1492 if (vc->vc_can_do_color &&
1493 vc->vc_par[1] < 16) {
1494 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1495 if (vc->vc_underline)
1496 update_attr(vc);
1497 }
1498 break;
1499 case 2: /* set color for half intensity mode */
1500 if (vc->vc_can_do_color &&
1501 vc->vc_par[1] < 16) {
1502 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1503 if (vc->vc_intensity == 0)
1504 update_attr(vc);
1505 }
1506 break;
1507 case 8: /* store colors as defaults */
1508 vc->vc_def_color = vc->vc_attr;
1509 if (vc->vc_hi_font_mask == 0x100)
1510 vc->vc_def_color >>= 1;
1511 default_attr(vc);
1512 update_attr(vc);
1513 break;
1514 case 9: /* set blanking interval */
f324edc8 1515 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1da177e4
LT		 1516 poke_blanked_console();
1517 break;
1518 case 10: /* set bell frequency in Hz */
1519 if (vc->vc_npar >= 1)
1520 vc->vc_bell_pitch = vc->vc_par[1];
1521 else
1522 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1523 break;
1524 case 11: /* set bell duration in msec */
1525 if (vc->vc_npar >= 1)
1526 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1527 vc->vc_par[1] * HZ / 1000 : 0;
1528 else
1529 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1530 break;
1531 case 12: /* bring specified console to the front */
1532 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1533 set_console(vc->vc_par[1] - 1);
1534 break;
1535 case 13: /* unblank the screen */
1536 poke_blanked_console();
1537 break;
1538 case 14: /* set vesa powerdown interval */
1539 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1540 break;
1541 case 15: /* activate the previous console */
1542 set_console(last_console);
1543 break;
1544 }
1545}
1546
ac751efa 1547/* console_lock is held */
1da177e4
LT		 1548static void csi_at(struct vc_data *vc, unsigned int nr)
1549{
1550 if (nr > vc->vc_cols - vc->vc_x)
1551 nr = vc->vc_cols - vc->vc_x;
1552 else if (!nr)
1553 nr = 1;
1554 insert_char(vc, nr);
1555}
1556
ac751efa 1557/* console_lock is held */
1da177e4
LT		 1558static void csi_L(struct vc_data *vc, unsigned int nr)
1559{
1560 if (nr > vc->vc_rows - vc->vc_y)
1561 nr = vc->vc_rows - vc->vc_y;
1562 else if (!nr)
1563 nr = 1;
1564 scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1565 vc->vc_need_wrap = 0;
1566}
1567
ac751efa 1568/* console_lock is held */
1da177e4
LT		 1569static void csi_P(struct vc_data *vc, unsigned int nr)
1570{
1571 if (nr > vc->vc_cols - vc->vc_x)
1572 nr = vc->vc_cols - vc->vc_x;
1573 else if (!nr)
1574 nr = 1;
1575 delete_char(vc, nr);
1576}
1577
ac751efa 1578/* console_lock is held */
1da177e4
LT		 1579static void csi_M(struct vc_data *vc, unsigned int nr)
1580{
1581 if (nr > vc->vc_rows - vc->vc_y)
1582 nr = vc->vc_rows - vc->vc_y;
1583 else if (!nr)
1584 nr=1;
1585 scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1586 vc->vc_need_wrap = 0;
1587}
1588
ac751efa 1589/* console_lock is held (except via vc_init->reset_terminal */
1da177e4
LT		 1590static void save_cur(struct vc_data *vc)
1591{
1592 vc->vc_saved_x = vc->vc_x;
1593 vc->vc_saved_y = vc->vc_y;
1594 vc->vc_s_intensity = vc->vc_intensity;
fa6ce9ab 1595 vc->vc_s_italic = vc->vc_italic;
1da177e4
LT		 1596 vc->vc_s_underline = vc->vc_underline;
1597 vc->vc_s_blink = vc->vc_blink;
1598 vc->vc_s_reverse = vc->vc_reverse;
1599 vc->vc_s_charset = vc->vc_charset;
1600 vc->vc_s_color = vc->vc_color;
1601 vc->vc_saved_G0 = vc->vc_G0_charset;
1602 vc->vc_saved_G1 = vc->vc_G1_charset;
1603}
1604
ac751efa 1605/* console_lock is held */
1da177e4
LT		 1606static void restore_cur(struct vc_data *vc)
1607{
1608 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1609 vc->vc_intensity = vc->vc_s_intensity;
fa6ce9ab 1610 vc->vc_italic = vc->vc_s_italic;
1da177e4
LT		 1611 vc->vc_underline = vc->vc_s_underline;
1612 vc->vc_blink = vc->vc_s_blink;
1613 vc->vc_reverse = vc->vc_s_reverse;
1614 vc->vc_charset = vc->vc_s_charset;
1615 vc->vc_color = vc->vc_s_color;
1616 vc->vc_G0_charset = vc->vc_saved_G0;
1617 vc->vc_G1_charset = vc->vc_saved_G1;
1618 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1619 update_attr(vc);
1620 vc->vc_need_wrap = 0;
1621}
1622
1623enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
1624 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1625 ESpalette };
1626
ac751efa 1627/* console_lock is held (except via vc_init()) */
1da177e4
LT		 1628static void reset_terminal(struct vc_data *vc, int do_clear)
1629{
1630 vc->vc_top = 0;
1631 vc->vc_bottom = vc->vc_rows;
1632 vc->vc_state = ESnormal;
1633 vc->vc_ques = 0;
1634 vc->vc_translate = set_translate(LAT1_MAP, vc);
1635 vc->vc_G0_charset = LAT1_MAP;
1636 vc->vc_G1_charset = GRAF_MAP;
1637 vc->vc_charset = 0;
1638 vc->vc_need_wrap = 0;
1639 vc->vc_report_mouse = 0;
042f10ec 1640 vc->vc_utf = default_utf8;
1da177e4
LT		 1641 vc->vc_utf_count = 0;
1642
1643 vc->vc_disp_ctrl = 0;
1644 vc->vc_toggle_meta = 0;
1645
1646 vc->vc_decscnm = 0;
1647 vc->vc_decom = 0;
1648 vc->vc_decawm = 1;
f6c06b68 1649 vc->vc_deccm = global_cursor_default;
1da177e4
LT		 1650 vc->vc_decim = 0;
1651
1652 set_kbd(vc, decarm);
1653 clr_kbd(vc, decckm);
1654 clr_kbd(vc, kbdapplic);
1655 clr_kbd(vc, lnm);
1656 kbd_table[vc->vc_num].lockstate = 0;
1657 kbd_table[vc->vc_num].slockstate = 0;
1658 kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
1659 kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
1660 /* do not do set_leds here because this causes an endless tasklet loop
1661 when the keyboard hasn't been initialized yet */
1662
9ea9a886 1663 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1664 vc->vc_complement_mask = vc->vc_s_complement_mask;
1665
1666 default_attr(vc);
1667 update_attr(vc);
1668
1669 vc->vc_tab_stop[0] = 0x01010100;
1670 vc->vc_tab_stop[1] =
1671 vc->vc_tab_stop[2] =
1672 vc->vc_tab_stop[3] =
a564738c
WK		 1673 vc->vc_tab_stop[4] =
1674 vc->vc_tab_stop[5] =
1675 vc->vc_tab_stop[6] =
1676 vc->vc_tab_stop[7] = 0x01010101;
1da177e4
LT		 1677
1678 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1679 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1680
1681 gotoxy(vc, 0, 0);
1682 save_cur(vc);
1683 if (do_clear)
1684 csi_J(vc, 2);
1685}
1686
ac751efa 1687/* console_lock is held */
1da177e4
LT		 1688static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1689{
1690 /*
1691 * Control characters can be used in the _middle_
1692 * of an escape sequence.
1693 */
1694 switch (c) {
1695 case 0:
1696 return;
1697 case 7:
1698 if (vc->vc_bell_duration)
1699 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1700 return;
1701 case 8:
1702 bs(vc);
1703 return;
1704 case 9:
1705 vc->vc_pos -= (vc->vc_x << 1);
1706 while (vc->vc_x < vc->vc_cols - 1) {
1707 vc->vc_x++;
1708 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1709 break;
1710 }
1711 vc->vc_pos += (vc->vc_x << 1);
b293d758 1712 notify_write(vc, '\t');
1da177e4
LT		 1713 return;
1714 case 10: case 11: case 12:
1715 lf(vc);
1716 if (!is_kbd(vc, lnm))
1717 return;
1718 case 13:
1719 cr(vc);
1720 return;
1721 case 14:
1722 vc->vc_charset = 1;
1723 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1724 vc->vc_disp_ctrl = 1;
1725 return;
1726 case 15:
1727 vc->vc_charset = 0;
1728 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1729 vc->vc_disp_ctrl = 0;
1730 return;
1731 case 24: case 26:
1732 vc->vc_state = ESnormal;
1733 return;
1734 case 27:
1735 vc->vc_state = ESesc;
1736 return;
1737 case 127:
1738 del(vc);
1739 return;
1740 case 128+27:
1741 vc->vc_state = ESsquare;
1742 return;
1743 }
1744 switch(vc->vc_state) {
1745 case ESesc:
1746 vc->vc_state = ESnormal;
1747 switch (c) {
1748 case '[':
1749 vc->vc_state = ESsquare;
1750 return;
1751 case ']':
1752 vc->vc_state = ESnonstd;
1753 return;
1754 case '%':
1755 vc->vc_state = ESpercent;
1756 return;
1757 case 'E':
1758 cr(vc);
1759 lf(vc);
1760 return;
1761 case 'M':
1762 ri(vc);
1763 return;
1764 case 'D':
1765 lf(vc);
1766 return;
1767 case 'H':
1768 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1769 return;
1770 case 'Z':
1771 respond_ID(tty);
1772 return;
1773 case '7':
1774 save_cur(vc);
1775 return;
1776 case '8':
1777 restore_cur(vc);
1778 return;
1779 case '(':
1780 vc->vc_state = ESsetG0;
1781 return;
1782 case ')':
1783 vc->vc_state = ESsetG1;
1784 return;
1785 case '#':
1786 vc->vc_state = EShash;
1787 return;
1788 case 'c':
1789 reset_terminal(vc, 1);
1790 return;
1791 case '>': /* Numeric keypad */
1792 clr_kbd(vc, kbdapplic);
1793 return;
1794 case '=': /* Appl. keypad */
1795 set_kbd(vc, kbdapplic);
1796 return;
1797 }
1798 return;
1799 case ESnonstd:
1800 if (c=='P') { /* palette escape sequence */
1801 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1802 vc->vc_par[vc->vc_npar] = 0;
1803 vc->vc_npar = 0;
1804 vc->vc_state = ESpalette;
1805 return;
1806 } else if (c=='R') { /* reset palette */
1807 reset_palette(vc);
1808 vc->vc_state = ESnormal;
1809 } else
1810 vc->vc_state = ESnormal;
1811 return;
1812 case ESpalette:
74c807ce
AS		 1813 if (isxdigit(c)) {
1814 vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1da177e4
LT		 1815 if (vc->vc_npar == 7) {
1816 int i = vc->vc_par[0] * 3, j = 1;
1817 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1818 vc->vc_palette[i++] += vc->vc_par[j++];
1819 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1820 vc->vc_palette[i++] += vc->vc_par[j++];
1821 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1822 vc->vc_palette[i] += vc->vc_par[j];
1823 set_palette(vc);
1824 vc->vc_state = ESnormal;
1825 }
1826 } else
1827 vc->vc_state = ESnormal;
1828 return;
1829 case ESsquare:
1830 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1831 vc->vc_par[vc->vc_npar] = 0;
1832 vc->vc_npar = 0;
1833 vc->vc_state = ESgetpars;
1834 if (c == '[') { /* Function key */
1835 vc->vc_state=ESfunckey;
1836 return;
1837 }
1838 vc->vc_ques = (c == '?');
1839 if (vc->vc_ques)
1840 return;
1841 case ESgetpars:
1842 if (c == ';' && vc->vc_npar < NPAR - 1) {
1843 vc->vc_npar++;
1844 return;
1845 } else if (c>='0' && c<='9') {
1846 vc->vc_par[vc->vc_npar] *= 10;
1847 vc->vc_par[vc->vc_npar] += c - '0';
1848 return;
1849 } else
1850 vc->vc_state = ESgotpars;
1851 case ESgotpars:
1852 vc->vc_state = ESnormal;
1853 switch(c) {
1854 case 'h':
1855 set_mode(vc, 1);
1856 return;
1857 case 'l':
1858 set_mode(vc, 0);
1859 return;
1860 case 'c':
1861 if (vc->vc_ques) {
1862 if (vc->vc_par[0])
1863 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1864 else
9ea9a886 1865 vc->vc_cursor_type = cur_default;
1da177e4
LT		 1866 return;
1867 }
1868 break;
1869 case 'm':
1870 if (vc->vc_ques) {
1871 clear_selection();
1872 if (vc->vc_par[0])
1873 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1874 else
1875 vc->vc_complement_mask = vc->vc_s_complement_mask;
1876 return;
1877 }
1878 break;
1879 case 'n':
1880 if (!vc->vc_ques) {
1881 if (vc->vc_par[0] == 5)
1882 status_report(tty);
1883 else if (vc->vc_par[0] == 6)
1884 cursor_report(vc, tty);
1885 }
1886 return;
1887 }
1888 if (vc->vc_ques) {
1889 vc->vc_ques = 0;
1890 return;
1891 }
1892 switch(c) {
1893 case 'G': case '`':
1894 if (vc->vc_par[0])
1895 vc->vc_par[0]--;
1896 gotoxy(vc, vc->vc_par[0], vc->vc_y);
1897 return;
1898 case 'A':
1899 if (!vc->vc_par[0])
1900 vc->vc_par[0]++;
1901 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1902 return;
1903 case 'B': case 'e':
1904 if (!vc->vc_par[0])
1905 vc->vc_par[0]++;
1906 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1907 return;
1908 case 'C': case 'a':
1909 if (!vc->vc_par[0])
1910 vc->vc_par[0]++;
1911 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1912 return;
1913 case 'D':
1914 if (!vc->vc_par[0])
1915 vc->vc_par[0]++;
1916 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1917 return;
1918 case 'E':
1919 if (!vc->vc_par[0])
1920 vc->vc_par[0]++;
1921 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1922 return;
1923 case 'F':
1924 if (!vc->vc_par[0])
1925 vc->vc_par[0]++;
1926 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1927 return;
1928 case 'd':
1929 if (vc->vc_par[0])
1930 vc->vc_par[0]--;
1931 gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1932 return;
1933 case 'H': case 'f':
1934 if (vc->vc_par[0])
1935 vc->vc_par[0]--;
1936 if (vc->vc_par[1])
1937 vc->vc_par[1]--;
1938 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1939 return;
1940 case 'J':
1941 csi_J(vc, vc->vc_par[0]);
1942 return;
1943 case 'K':
1944 csi_K(vc, vc->vc_par[0]);
1945 return;
1946 case 'L':
1947 csi_L(vc, vc->vc_par[0]);
1948 return;
1949 case 'M':
1950 csi_M(vc, vc->vc_par[0]);
1951 return;
1952 case 'P':
1953 csi_P(vc, vc->vc_par[0]);
1954 return;
1955 case 'c':
1956 if (!vc->vc_par[0])
1957 respond_ID(tty);
1958 return;
1959 case 'g':
1960 if (!vc->vc_par[0])
1961 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1962 else if (vc->vc_par[0] == 3) {
1963 vc->vc_tab_stop[0] =
1964 vc->vc_tab_stop[1] =
1965 vc->vc_tab_stop[2] =
1966 vc->vc_tab_stop[3] =
a564738c
WK		 1967 vc->vc_tab_stop[4] =
1968 vc->vc_tab_stop[5] =
1969 vc->vc_tab_stop[6] =
1970 vc->vc_tab_stop[7] = 0;
1da177e4
LT		 1971 }
1972 return;
1973 case 'm':
1974 csi_m(vc);
1975 return;
1976 case 'q': /* DECLL - but only 3 leds */
1977 /* map 0,1,2,3 to 0,1,2,4 */
1978 if (vc->vc_par[0] < 4)
1979 setledstate(kbd_table + vc->vc_num,
1980 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1981 return;
1982 case 'r':
1983 if (!vc->vc_par[0])
1984 vc->vc_par[0]++;
1985 if (!vc->vc_par[1])
1986 vc->vc_par[1] = vc->vc_rows;
1987 /* Minimum allowed region is 2 lines */
1988 if (vc->vc_par[0] < vc->vc_par[1] &&
1989 vc->vc_par[1] <= vc->vc_rows) {
1990 vc->vc_top = vc->vc_par[0] - 1;
1991 vc->vc_bottom = vc->vc_par[1];
1992 gotoxay(vc, 0, 0);
1993 }
1994 return;
1995 case 's':
1996 save_cur(vc);
1997 return;
1998 case 'u':
1999 restore_cur(vc);
2000 return;
2001 case 'X':
2002 csi_X(vc, vc->vc_par[0]);
2003 return;
2004 case '@':
2005 csi_at(vc, vc->vc_par[0]);
2006 return;
2007 case ']': /* setterm functions */
2008 setterm_command(vc);
2009 return;
2010 }
2011 return;
2012 case ESpercent:
2013 vc->vc_state = ESnormal;
2014 switch (c) {
2015 case '@': /* defined in ISO 2022 */
2016 vc->vc_utf = 0;
2017 return;
2018 case 'G': /* prelim official escape code */
2019 case '8': /* retained for compatibility */
2020 vc->vc_utf = 1;
2021 return;
2022 }
2023 return;
2024 case ESfunckey:
2025 vc->vc_state = ESnormal;
2026 return;
2027 case EShash:
2028 vc->vc_state = ESnormal;
2029 if (c == '8') {
2030 /* DEC screen alignment test. kludge :-) */
2031 vc->vc_video_erase_char =
2032 (vc->vc_video_erase_char & 0xff00) | 'E';
2033 csi_J(vc, 2);
2034 vc->vc_video_erase_char =
2035 (vc->vc_video_erase_char & 0xff00) | ' ';
2036 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2037 }
2038 return;
2039 case ESsetG0:
2040 if (c == '0')
2041 vc->vc_G0_charset = GRAF_MAP;
2042 else if (c == 'B')
2043 vc->vc_G0_charset = LAT1_MAP;
2044 else if (c == 'U')
2045 vc->vc_G0_charset = IBMPC_MAP;
2046 else if (c == 'K')
2047 vc->vc_G0_charset = USER_MAP;
2048 if (vc->vc_charset == 0)
2049 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2050 vc->vc_state = ESnormal;
2051 return;
2052 case ESsetG1:
2053 if (c == '0')
2054 vc->vc_G1_charset = GRAF_MAP;
2055 else if (c == 'B')
2056 vc->vc_G1_charset = LAT1_MAP;
2057 else if (c == 'U')
2058 vc->vc_G1_charset = IBMPC_MAP;
2059 else if (c == 'K')
2060 vc->vc_G1_charset = USER_MAP;
2061 if (vc->vc_charset == 1)
2062 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2063 vc->vc_state = ESnormal;
2064 return;
2065 default:
2066 vc->vc_state = ESnormal;
2067 }
2068}
2069
2f1a2ccb 2070/* is_double_width() is based on the wcwidth() implementation by
1ed8a2b3 2071 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2f1a2ccb
EK		 2072 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2073 */
2074struct interval {
2075 uint32_t first;
2076 uint32_t last;
2077};
2078
2079static int bisearch(uint32_t ucs, const struct interval *table, int max)
2080{
2081 int min = 0;
2082 int mid;
2083
2084 if (ucs < table[0].first || ucs > table[max].last)
2085 return 0;
2086 while (max >= min) {
2087 mid = (min + max) / 2;
2088 if (ucs > table[mid].last)
2089 min = mid + 1;
2090 else if (ucs < table[mid].first)
2091 max = mid - 1;
2092 else
2093 return 1;
2094 }
2095 return 0;
2096}
2097
2098static int is_double_width(uint32_t ucs)
2099{
2100 static const struct interval double_width[] = {
2101 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2102 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
1ed8a2b3
EK		 2103 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2104 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2f1a2ccb 2105 };
0f11541b 2106 return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2f1a2ccb
EK		 2107}
2108
ac751efa 2109/* acquires console_lock */
1da177e4
LT		 2110static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2111{
2112#ifdef VT_BUF_VRAM_ONLY
2113#define FLUSH do { } while(0);
2114#else
2115#define FLUSH if (draw_x >= 0) { \
2116 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2117 draw_x = -1; \
2118 }
2119#endif
2120
2121 int c, tc, ok, n = 0, draw_x = -1;
2122 unsigned int currcons;
2123 unsigned long draw_from = 0, draw_to = 0;
2124 struct vc_data *vc;
2f1a2ccb 2125 unsigned char vc_attr;
0341a4d0 2126 struct vt_notifier_param param;
2f1a2ccb
EK		 2127 uint8_t rescan;
2128 uint8_t inverse;
2129 uint8_t width;
1da177e4 2130 u16 himask, charmask;
1da177e4
LT		 2131
2132 if (in_interrupt())
2133 return count;
2134
2135 might_sleep();
2136
ac751efa 2137 console_lock();
1da177e4
LT		 2138 vc = tty->driver_data;
2139 if (vc == NULL) {
2140 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
ac751efa 2141 console_unlock();
1da177e4
LT		 2142 return 0;
2143 }
2144
2145 currcons = vc->vc_num;
2146 if (!vc_cons_allocated(currcons)) {
1ffdda95
MSB		 2147 /* could this happen? */
2148 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2149 console_unlock();
2150 return 0;
1da177e4 2151 }
1da177e4 2152
1da177e4
LT		 2153 himask = vc->vc_hi_font_mask;
2154 charmask = himask ? 0x1ff : 0xff;
2155
2156 /* undraw cursor first */
2157 if (IS_FG(vc))
2158 hide_cursor(vc);
2159
0341a4d0
KD		 2160 param.vc = vc;
2161
1da177e4
LT		 2162 while (!tty->stopped && count) {
2163 int orig = *buf;
2164 c = orig;
2165 buf++;
2166 n++;
2167 count--;
2f1a2ccb
EK		 2168 rescan = 0;
2169 inverse = 0;
2170 width = 1;
1da177e4
LT		 2171
2172 /* Do no translation at all in control states */
2173 if (vc->vc_state != ESnormal) {
2174 tc = c;
d4328b40 2175 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2f1a2ccb
EK		 2176 /* Combine UTF-8 into Unicode in vc_utf_char.
2177 * vc_utf_count is the number of continuation bytes still
2178 * expected to arrive.
2179 * vc_npar is the number of continuation bytes arrived so
2180 * far
2181 */
d4328b40 2182rescan_last_byte:
2f1a2ccb
EK		 2183 if ((c & 0xc0) == 0x80) {
2184 /* Continuation byte received */
2185 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
d4328b40 2186 if (vc->vc_utf_count) {
2f1a2ccb
EK		 2187 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2188 vc->vc_npar++;
2189 if (--vc->vc_utf_count) {
2190 /* Still need some bytes */
1da177e4 2191 continue;
2f1a2ccb
EK		 2192 }
2193 /* Got a whole character */
2194 c = vc->vc_utf_char;
2195 /* Reject overlong sequences */
2196 if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2197 c > utf8_length_changes[vc->vc_npar])
2198 c = 0xfffd;
2199 } else {
2200 /* Unexpected continuation byte */
2201 vc->vc_utf_count = 0;
2202 c = 0xfffd;
2203 }
1da177e4 2204 } else {
2f1a2ccb
EK		 2205 /* Single ASCII byte or first byte of a sequence received */
2206 if (vc->vc_utf_count) {
2207 /* Continuation byte expected */
2208 rescan = 1;
2209 vc->vc_utf_count = 0;
2210 c = 0xfffd;
2211 } else if (c > 0x7f) {
2212 /* First byte of a multibyte sequence received */
2213 vc->vc_npar = 0;
2214 if ((c & 0xe0) == 0xc0) {
2215 vc->vc_utf_count = 1;
2216 vc->vc_utf_char = (c & 0x1f);
2217 } else if ((c & 0xf0) == 0xe0) {
2218 vc->vc_utf_count = 2;
2219 vc->vc_utf_char = (c & 0x0f);
2220 } else if ((c & 0xf8) == 0xf0) {
2221 vc->vc_utf_count = 3;
2222 vc->vc_utf_char = (c & 0x07);
2223 } else if ((c & 0xfc) == 0xf8) {
2224 vc->vc_utf_count = 4;
2225 vc->vc_utf_char = (c & 0x03);
2226 } else if ((c & 0xfe) == 0xfc) {
2227 vc->vc_utf_count = 5;
2228 vc->vc_utf_char = (c & 0x01);
2229 } else {
2230 /* 254 and 255 are invalid */
2231 c = 0xfffd;
2232 }
2233 if (vc->vc_utf_count) {
2234 /* Still need some bytes */
2235 continue;
2236 }
2237 }
2238 /* Nothing to do if an ASCII byte was received */
1da177e4 2239 }
2f1a2ccb
EK		 2240 /* End of UTF-8 decoding. */
2241 /* c is the received character, or U+FFFD for invalid sequences. */
2242 /* Replace invalid Unicode code points with U+FFFD too */
2243 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2244 c = 0xfffd;
2245 tc = c;
d4328b40 2246 } else { /* no utf or alternate charset mode */
a29ccf6f 2247 tc = vc_translate(vc, c);
1da177e4
LT		 2248 }
2249
0341a4d0
KD		 2250 param.c = tc;
2251 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2252 &param) == NOTIFY_STOP)
2253 continue;
2254
1da177e4
LT		 2255 /* If the original code was a control character we
2256 * only allow a glyph to be displayed if the code is
2257 * not normally used (such as for cursor movement) or
2258 * if the disp_ctrl mode has been explicitly enabled.
2259 * Certain characters (as given by the CTRL_ALWAYS
2260 * bitmap) are always displayed as control characters,
2261 * as the console would be pretty useless without
2262 * them; to display an arbitrary font position use the
2263 * direct-to-font zone in UTF-8 mode.
2264 */
2265 ok = tc && (c >= 32 ||
d4328b40
AT		 2266 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2267 vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
1da177e4
LT		 2268 && (c != 127 || vc->vc_disp_ctrl)
2269 && (c != 128+27);
2270
2271 if (vc->vc_state == ESnormal && ok) {
2f1a2ccb
EK		 2272 if (vc->vc_utf && !vc->vc_disp_ctrl) {
2273 if (is_double_width(c))
2274 width = 2;
2275 }
1da177e4
LT		 2276 /* Now try to find out how to display it */
2277 tc = conv_uni_to_pc(vc, tc);
d4328b40 2278 if (tc & ~charmask) {
2f1a2ccb
EK		 2279 if (tc == -1 || tc == -2) {
2280 continue; /* nothing to display */
2281 }
2282 /* Glyph not found */
c0b79882 2283 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2f1a2ccb 2284 /* In legacy mode use the glyph we get by a 1:1 mapping.
1ed8a2b3
EK		 2285 This would make absolutely no sense with Unicode in mind,
2286 but do this for ASCII characters since a font may lack
2287 Unicode mapping info and we don't want to end up with
2288 having question marks only. */
2f1a2ccb
EK		 2289 tc = c;
2290 } else {
2291 /* Display U+FFFD. If it's not found, display an inverse question mark. */
2292 tc = conv_uni_to_pc(vc, 0xfffd);
2293 if (tc < 0) {
2294 inverse = 1;
2295 tc = conv_uni_to_pc(vc, '?');
2296 if (tc < 0) tc = '?';
2297 }
2298 }
d4328b40 2299 }
1da177e4 2300
2f1a2ccb
EK		 2301 if (!inverse) {
2302 vc_attr = vc->vc_attr;
1da177e4 2303 } else {
2f1a2ccb
EK		 2304 /* invert vc_attr */
2305 if (!vc->vc_can_do_color) {
2306 vc_attr = (vc->vc_attr) ^ 0x08;
2307 } else if (vc->vc_hi_font_mask == 0x100) {
2308 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2309 } else {
2310 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2311 }
1ed8a2b3 2312 FLUSH
1da177e4 2313 }
2f1a2ccb
EK		 2314
2315 while (1) {
2316 if (vc->vc_need_wrap || vc->vc_decim)
2317 FLUSH
2318 if (vc->vc_need_wrap) {
2319 cr(vc);
2320 lf(vc);
2321 }
2322 if (vc->vc_decim)
2323 insert_char(vc, 1);
2324 scr_writew(himask ?
2325 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2326 (vc_attr << 8) + tc,
2327 (u16 *) vc->vc_pos);
2328 if (DO_UPDATE(vc) && draw_x < 0) {
2329 draw_x = vc->vc_x;
2330 draw_from = vc->vc_pos;
2331 }
2332 if (vc->vc_x == vc->vc_cols - 1) {
2333 vc->vc_need_wrap = vc->vc_decawm;
2334 draw_to = vc->vc_pos + 2;
2335 } else {
2336 vc->vc_x++;
2337 draw_to = (vc->vc_pos += 2);
d4328b40 2338 }
2f1a2ccb
EK		 2339
2340 if (!--width) break;
2341
2342 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2343 if (tc < 0) tc = ' ';
2344 }
b293d758 2345 notify_write(vc, c);
2f1a2ccb 2346
1ed8a2b3
EK		 2347 if (inverse) {
2348 FLUSH
2349 }
2350
2f1a2ccb
EK		 2351 if (rescan) {
2352 rescan = 0;
2353 inverse = 0;
2354 width = 1;
d4328b40
AT		 2355 c = orig;
2356 goto rescan_last_byte;
2357 }
1da177e4
LT		 2358 continue;
2359 }
2360 FLUSH
2361 do_con_trol(tty, vc, orig);
2362 }
2363 FLUSH
2364 console_conditional_schedule();
ac751efa 2365 console_unlock();
b293d758 2366 notify_update(vc);
1da177e4
LT		 2367 return n;
2368#undef FLUSH
2369}
2370
2371/*
2372 * This is the console switching callback.
2373 *
2374 * Doing console switching in a process context allows
2375 * us to do the switches asynchronously (needed when we want
2376 * to switch due to a keyboard interrupt). Synchronization
2377 * with other console code and prevention of re-entrancy is
ac751efa 2378 * ensured with console_lock.
1da177e4 2379 */
65f27f38 2380static void console_callback(struct work_struct *ignored)
1da177e4 2381{
ac751efa 2382 console_lock();
1da177e4
LT		 2383
2384 if (want_console >= 0) {
2385 if (want_console != fg_console &&
2386 vc_cons_allocated(want_console)) {
2387 hide_cursor(vc_cons[fg_console].d);
2388 change_console(vc_cons[want_console].d);
2389 /* we only changed when the console had already
2390 been allocated - a new console is not created
2391 in an interrupt routine */
2392 }
2393 want_console = -1;
2394 }
2395 if (do_poke_blanked_console) { /* do not unblank for a LED change */
2396 do_poke_blanked_console = 0;
2397 poke_blanked_console();
2398 }
2399 if (scrollback_delta) {
2400 struct vc_data *vc = vc_cons[fg_console].d;
2401 clear_selection();
2402 if (vc->vc_mode == KD_TEXT)
2403 vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2404 scrollback_delta = 0;
2405 }
2406 if (blank_timer_expired) {
2407 do_blank_screen(0);
2408 blank_timer_expired = 0;
2409 }
b293d758 2410 notify_update(vc_cons[fg_console].d);
1da177e4 2411
ac751efa 2412 console_unlock();
1da177e4
LT		 2413}
2414
b257bc05 2415int set_console(int nr)
1da177e4 2416{
b257bc05
AJ		 2417 struct vc_data *vc = vc_cons[fg_console].d;
2418
2419 if (!vc_cons_allocated(nr) || vt_dont_switch ||
2420 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2421
2422 /*
2423 * Console switch will fail in console_callback() or
2424 * change_console() so there is no point scheduling
2425 * the callback
2426 *
2427 * Existing set_console() users don't check the return
2428 * value so this shouldn't break anything
2429 */
2430 return -EINVAL;
2431 }
2432
1da177e4
LT		 2433 want_console = nr;
2434 schedule_console_callback();
b257bc05
AJ		 2435
2436 return 0;
1da177e4
LT		 2437}
2438
2439struct tty_driver *console_driver;
2440
2441#ifdef CONFIG_VT_CONSOLE
2442
5ada918b
BW		 2443/**
2444 * vt_kmsg_redirect() - Sets/gets the kernel message console
2445 * @new: The new virtual terminal number or -1 if the console should stay
2446 * unchanged
2447 *
2448 * By default, the kernel messages are always printed on the current virtual
2449 * console. However, the user may modify that default with the
2450 * TIOCL_SETKMSGREDIRECT ioctl call.
2451 *
2452 * This function sets the kernel message console to be @new. It returns the old
2453 * virtual console number. The virtual terminal number 0 (both as parameter and
2454 * return value) means no redirection (i.e. always printed on the currently
2455 * active console).
2456 *
2457 * The parameter -1 means that only the current console is returned, but the
2458 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2459 * case to make the code more understandable.
2460 *
2461 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2462 * the parameter and always returns 0.
2463 */
2464int vt_kmsg_redirect(int new)
2465{
2466 static int kmsg_con;
2467
2468 if (new != -1)
2469 return xchg(&kmsg_con, new);
2470 else
2471 return kmsg_con;
2472}
2473
1da177e4
LT		 2474/*
2475 * Console on virtual terminal
2476 *
2477 * The console must be locked when we get here.
2478 */
2479
2480static void vt_console_print(struct console *co, const char *b, unsigned count)
2481{
2482 struct vc_data *vc = vc_cons[fg_console].d;
2483 unsigned char c;
b0940003 2484 static DEFINE_SPINLOCK(printing_lock);
1da177e4
LT		 2485 const ushort *start;
2486 ushort cnt = 0;
2487 ushort myx;
5ada918b 2488 int kmsg_console;
1da177e4
LT		 2489
2490 /* console busy or not yet initialized */
b0940003
NP		 2491 if (!printable)
2492 return;
2493 if (!spin_trylock(&printing_lock))
1da177e4
LT		 2494 return;
2495
5ada918b
BW		 2496 kmsg_console = vt_get_kmsg_redirect();
2497 if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2498 vc = vc_cons[kmsg_console - 1].d;
1da177e4
LT		 2499
2500 /* read `x' only after setting currcons properly (otherwise
2501 the `x' macro will read the x of the foreground console). */
2502 myx = vc->vc_x;
2503
2504 if (!vc_cons_allocated(fg_console)) {
2505 /* impossible */
2506 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2507 goto quit;
2508 }
2509
8fd4bd22 2510 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 2511 goto quit;
2512
2513 /* undraw cursor first */
2514 if (IS_FG(vc))
2515 hide_cursor(vc);
2516
2517 start = (ushort *)vc->vc_pos;
2518
2519 /* Contrived structure to try to emulate original need_wrap behaviour
2520 * Problems caused when we have need_wrap set on '\n' character */
2521 while (count--) {
2522 c = *b++;
2523 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2524 if (cnt > 0) {
2525 if (CON_IS_VISIBLE(vc))
2526 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2527 vc->vc_x += cnt;
2528 if (vc->vc_need_wrap)
2529 vc->vc_x--;
2530 cnt = 0;
2531 }
2532 if (c == 8) { /* backspace */
2533 bs(vc);
2534 start = (ushort *)vc->vc_pos;
2535 myx = vc->vc_x;
2536 continue;
2537 }
2538 if (c != 13)
2539 lf(vc);
2540 cr(vc);
2541 start = (ushort *)vc->vc_pos;
2542 myx = vc->vc_x;
2543 if (c == 10 || c == 13)
2544 continue;
2545 }
2546 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
b293d758 2547 notify_write(vc, c);
1da177e4
LT		 2548 cnt++;
2549 if (myx == vc->vc_cols - 1) {
2550 vc->vc_need_wrap = 1;
2551 continue;
2552 }
2553 vc->vc_pos += 2;
2554 myx++;
2555 }
2556 if (cnt > 0) {
2557 if (CON_IS_VISIBLE(vc))
2558 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2559 vc->vc_x += cnt;
2560 if (vc->vc_x == vc->vc_cols) {
2561 vc->vc_x--;
2562 vc->vc_need_wrap = 1;
2563 }
2564 }
2565 set_cursor(vc);
b293d758 2566 notify_update(vc);
1da177e4
LT		 2567
2568quit:
b0940003 2569 spin_unlock(&printing_lock);
1da177e4
LT		 2570}
2571
2572static struct tty_driver *vt_console_device(struct console *c, int *index)
2573{
2574 *index = c->index ? c->index-1 : fg_console;
2575 return console_driver;
2576}
2577
2578static struct console vt_console_driver = {
2579 .name = "tty",
2580 .write = vt_console_print,
2581 .device = vt_console_device,
2582 .unblank = unblank_screen,
2583 .flags = CON_PRINTBUFFER,
2584 .index = -1,
2585};
2586#endif
2587
2588/*
2589 * Handling of Linux-specific VC ioctls
2590 */
2591
2592/*
ac751efa 2593 * Generally a bit racy with respect to console_lock();.
1da177e4
LT		 2594 *
2595 * There are some functions which don't need it.
2596 *
2597 * There are some functions which can sleep for arbitrary periods
2598 * (paste_selection) but we don't need the lock there anyway.
2599 *
2600 * set_selection has locking, and definitely needs it
2601 */
2602
2603int tioclinux(struct tty_struct *tty, unsigned long arg)
2604{
2605 char type, data;
2606 char __user *p = (char __user *)arg;
2607 int lines;
2608 int ret;
2609
1da177e4
LT		 2610 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2611 return -EPERM;
2612 if (get_user(type, p))
2613 return -EFAULT;
2614 ret = 0;
04f378b1 2615
1da177e4
LT		 2616 switch (type)
2617 {
2618 case TIOCL_SETSEL:
ac751efa 2619 console_lock();
1da177e4 2620 ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
ac751efa 2621 console_unlock();
1da177e4
LT		 2622 break;
2623 case TIOCL_PASTESEL:
2624 ret = paste_selection(tty);
2625 break;
2626 case TIOCL_UNBLANKSCREEN:
ac751efa 2627 console_lock();
1da177e4 2628 unblank_screen();
ac751efa 2629 console_unlock();
1da177e4
LT		 2630 break;
2631 case TIOCL_SELLOADLUT:
2632 ret = sel_loadlut(p);
2633 break;
2634 case TIOCL_GETSHIFTSTATE:
04f378b1 2635
1da177e4
LT		 2636 /*
2637 * Make it possible to react to Shift+Mousebutton.
2638 * Note that 'shift_state' is an undocumented
2639 * kernel-internal variable; programs not closely
2640 * related to the kernel should not use this.
2641 */
2642 data = shift_state;
2643 ret = __put_user(data, p);
2644 break;
2645 case TIOCL_GETMOUSEREPORTING:
2646 data = mouse_reporting();
2647 ret = __put_user(data, p);
2648 break;
2649 case TIOCL_SETVESABLANK:
403aac96 2650 ret = set_vesa_blanking(p);
1da177e4 2651 break;
0ca07731 2652 case TIOCL_GETKMSGREDIRECT:
5ada918b 2653 data = vt_get_kmsg_redirect();
0ca07731
RW		 2654 ret = __put_user(data, p);
2655 break;
1da177e4
LT		 2656 case TIOCL_SETKMSGREDIRECT:
2657 if (!capable(CAP_SYS_ADMIN)) {
2658 ret = -EPERM;
2659 } else {
2660 if (get_user(data, p+1))
2661 ret = -EFAULT;
2662 else
5ada918b 2663 vt_kmsg_redirect(data);
1da177e4
LT		 2664 }
2665 break;
2666 case TIOCL_GETFGCONSOLE:
2667 ret = fg_console;
2668 break;
2669 case TIOCL_SCROLLCONSOLE:
2670 if (get_user(lines, (s32 __user *)(p+4))) {
2671 ret = -EFAULT;
2672 } else {
2673 scrollfront(vc_cons[fg_console].d, lines);
2674 ret = 0;
2675 }
2676 break;
2677 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
ac751efa 2678 console_lock();
1da177e4
LT		 2679 ignore_poke = 1;
2680 do_blank_screen(0);
ac751efa 2681 console_unlock();
1da177e4
LT		 2682 break;
2683 case TIOCL_BLANKEDSCREEN:
2684 ret = console_blanked;
2685 break;
2686 default:
2687 ret = -EINVAL;
2688 break;
2689 }
2690 return ret;
2691}
2692
2693/*
2694 * /dev/ttyN handling
2695 */
2696
2697static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2698{
2699 int retval;
2700
2701 retval = do_con_write(tty, buf, count);
2702 con_flush_chars(tty);
2703
2704 return retval;
2705}
2706
5d19f546 2707static int con_put_char(struct tty_struct *tty, unsigned char ch)
1da177e4
LT		 2708{
2709 if (in_interrupt())
5d19f546
AC		 2710 return 0; /* n_r3964 calls put_char() from interrupt context */
2711 return do_con_write(tty, &ch, 1);
1da177e4
LT		 2712}
2713
2714static int con_write_room(struct tty_struct *tty)
2715{
2716 if (tty->stopped)
2717 return 0;
a88a69c9 2718 return 32768; /* No limit, really; we're not buffering */
1da177e4
LT		 2719}
2720
2721static int con_chars_in_buffer(struct tty_struct *tty)
2722{
2723 return 0; /* we're not buffering */
2724}
2725
2726/*
2727 * con_throttle and con_unthrottle are only used for
2728 * paste_selection(), which has to stuff in a large number of
2729 * characters...
2730 */
2731static void con_throttle(struct tty_struct *tty)
2732{
2733}
2734
2735static void con_unthrottle(struct tty_struct *tty)
2736{
2737 struct vc_data *vc = tty->driver_data;
2738
2739 wake_up_interruptible(&vc->paste_wait);
2740}
2741
2742/*
2743 * Turn the Scroll-Lock LED on when the tty is stopped
2744 */
2745static void con_stop(struct tty_struct *tty)
2746{
2747 int console_num;
2748 if (!tty)
2749 return;
2750 console_num = tty->index;
2751 if (!vc_cons_allocated(console_num))
2752 return;
2753 set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2754 set_leds();
2755}
2756
2757/*
2758 * Turn the Scroll-Lock LED off when the console is started
2759 */
2760static void con_start(struct tty_struct *tty)
2761{
2762 int console_num;
2763 if (!tty)
2764 return;
2765 console_num = tty->index;
2766 if (!vc_cons_allocated(console_num))
2767 return;
2768 clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
2769 set_leds();
2770}
2771
2772static void con_flush_chars(struct tty_struct *tty)
2773{
2774 struct vc_data *vc;
2775
2776 if (in_interrupt()) /* from flush_to_ldisc */
2777 return;
2778
2779 /* if we race with con_close(), vt may be null */
ac751efa 2780 console_lock();
1da177e4
LT		 2781 vc = tty->driver_data;
2782 if (vc)
2783 set_cursor(vc);
ac751efa 2784 console_unlock();
1da177e4
LT		 2785}
2786
2787/*
2788 * Allocate the console screen memory.
2789 */
2790static int con_open(struct tty_struct *tty, struct file *filp)
2791{
2792 unsigned int currcons = tty->index;
2793 int ret = 0;
2794
ac751efa 2795 console_lock();
f786648b 2796 if (tty->driver_data == NULL) {
1da177e4
LT		 2797 ret = vc_allocate(currcons);
2798 if (ret == 0) {
2799 struct vc_data *vc = vc_cons[currcons].d;
feebed65
AC		 2800
2801 /* Still being freed */
8ce73264 2802 if (vc->port.tty) {
ac751efa 2803 console_unlock();
feebed65
AC		 2804 return -ERESTARTSYS;
2805 }
1da177e4 2806 tty->driver_data = vc;
8ce73264 2807 vc->port.tty = tty;
1da177e4
LT		 2808
2809 if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2810 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2811 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2812 }
c1236d31
ST		 2813 if (vc->vc_utf)
2814 tty->termios->c_iflag |= IUTF8;
2815 else
2816 tty->termios->c_iflag &= ~IUTF8;
ac751efa 2817 console_unlock();
1da177e4
LT		 2818 return ret;
2819 }
2820 }
ac751efa 2821 console_unlock();
1da177e4
LT		 2822 return ret;
2823}
2824
1da177e4
LT		 2825static void con_close(struct tty_struct *tty, struct file *filp)
2826{
feebed65
AC		 2827 /* Nothing to do - we defer to shutdown */
2828}
1da177e4 2829
feebed65
AC		 2830static void con_shutdown(struct tty_struct *tty)
2831{
2832 struct vc_data *vc = tty->driver_data;
2833 BUG_ON(vc == NULL);
ac751efa 2834 console_lock();
8ce73264 2835 vc->port.tty = NULL;
ac751efa 2836 console_unlock();
feebed65 2837 tty_shutdown(tty);
1da177e4
LT		 2838}
2839
fa6ce9ab
JE		 2840static int default_italic_color = 2; // green (ASCII)
2841static int default_underline_color = 3; // cyan (ASCII)
2842module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2843module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2844
1da177e4
LT		 2845static void vc_init(struct vc_data *vc, unsigned int rows,
2846 unsigned int cols, int do_clear)
2847{
2848 int j, k ;
2849
2850 vc->vc_cols = cols;
2851 vc->vc_rows = rows;
2852 vc->vc_size_row = cols << 1;
2853 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2854
2855 set_origin(vc);
2856 vc->vc_pos = vc->vc_origin;
2857 reset_vc(vc);
2858 for (j=k=0; j<16; j++) {
2859 vc->vc_palette[k++] = default_red[j] ;
2860 vc->vc_palette[k++] = default_grn[j] ;
2861 vc->vc_palette[k++] = default_blu[j] ;
2862 }
2863 vc->vc_def_color = 0x07; /* white */
fa6ce9ab
JE		 2864 vc->vc_ulcolor = default_underline_color;
2865 vc->vc_itcolor = default_italic_color;
1da177e4
LT		 2866 vc->vc_halfcolor = 0x08; /* grey */
2867 init_waitqueue_head(&vc->paste_wait);
2868 reset_terminal(vc, do_clear);
2869}
2870
2871/*
2872 * This routine initializes console interrupts, and does nothing
2873 * else. If you want the screen to clear, call tty_write with
2874 * the appropriate escape-sequence.
2875 */
2876
2877static int __init con_init(void)
2878{
2879 const char *display_desc = NULL;
2880 struct vc_data *vc;
3e795de7 2881 unsigned int currcons = 0, i;
1da177e4 2882
ac751efa 2883 console_lock();
1da177e4
LT		 2884
2885 if (conswitchp)
2886 display_desc = conswitchp->con_startup();
2887 if (!display_desc) {
2888 fg_console = 0;
ac751efa 2889 console_unlock();
1da177e4
LT		 2890 return 0;
2891 }
2892
3e795de7
AD		 2893 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2894 struct con_driver *con_driver = &registered_con_driver[i];
2895
2896 if (con_driver->con == NULL) {
2897 con_driver->con = conswitchp;
2898 con_driver->desc = display_desc;
2899 con_driver->flag = CON_DRIVER_FLAG_INIT;
2900 con_driver->first = 0;
2901 con_driver->last = MAX_NR_CONSOLES - 1;
2902 break;
2903 }
2904 }
2905
2906 for (i = 0; i < MAX_NR_CONSOLES; i++)
2907 con_driver_map[i] = conswitchp;
2908
1da177e4
LT		 2909 if (blankinterval) {
2910 blank_state = blank_normal_wait;
f324edc8 2911 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 2912 }
2913
1da177e4 2914 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
a5f4f52e 2915 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
7f1f86a0 2916 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
ff917ba4 2917 tty_port_init(&vc->port);
1da177e4 2918 visual_init(vc, currcons, 1);
a5f4f52e 2919 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
1da177e4
LT		 2920 vc_init(vc, vc->vc_rows, vc->vc_cols,
2921 currcons || !vc->vc_sw->con_save_screen);
2922 }
2923 currcons = fg_console = 0;
2924 master_display_fg = vc = vc_cons[currcons].d;
2925 set_origin(vc);
2926 save_screen(vc);
2927 gotoxy(vc, vc->vc_x, vc->vc_y);
2928 csi_J(vc, 0);
2929 update_screen(vc);
1ffdda95 2930 pr_info("Console: %s %s %dx%d",
1da177e4
LT		 2931 vc->vc_can_do_color ? "colour" : "mono",
2932 display_desc, vc->vc_cols, vc->vc_rows);
2933 printable = 1;
2934 printk("\n");
2935
ac751efa 2936 console_unlock();
1da177e4
LT		 2937
2938#ifdef CONFIG_VT_CONSOLE
2939 register_console(&vt_console_driver);
2940#endif
2941 return 0;
2942}
2943console_initcall(con_init);
2944
b68e31d0 2945static const struct tty_operations con_ops = {
1da177e4
LT		 2946 .open = con_open,
2947 .close = con_close,
2948 .write = con_write,
2949 .write_room = con_write_room,
2950 .put_char = con_put_char,
2951 .flush_chars = con_flush_chars,
2952 .chars_in_buffer = con_chars_in_buffer,
2953 .ioctl = vt_ioctl,
e9216651
AB		 2954#ifdef CONFIG_COMPAT
2955 .compat_ioctl = vt_compat_ioctl,
2956#endif
1da177e4
LT		 2957 .stop = con_stop,
2958 .start = con_start,
2959 .throttle = con_throttle,
2960 .unthrottle = con_unthrottle,
8c9a9dd0 2961 .resize = vt_resize,
feebed65 2962 .shutdown = con_shutdown
1da177e4
LT		 2963};
2964
d81ed103
AC		 2965static struct cdev vc0_cdev;
2966
fbc92a34
KS		 2967static ssize_t show_tty_active(struct device *dev,
2968 struct device_attribute *attr, char *buf)
2969{
2970 return sprintf(buf, "tty%d\n", fg_console + 1);
2971}
2972static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2973
d81ed103 2974int __init vty_init(const struct file_operations *console_fops)
1da177e4 2975{
d81ed103
AC		 2976 cdev_init(&vc0_cdev, console_fops);
2977 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2978 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2979 panic("Couldn't register /dev/tty0 driver\n");
fbc92a34
KS		 2980 tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2981 if (IS_ERR(tty0dev))
2982 tty0dev = NULL;
2983 else
a2a6a822 2984 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
d81ed103 2985
1da177e4
LT		 2986 vcs_init();
2987
2988 console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2989 if (!console_driver)
2990 panic("Couldn't allocate console driver\n");
2991 console_driver->owner = THIS_MODULE;
1da177e4
LT		 2992 console_driver->name = "tty";
2993 console_driver->name_base = 1;
2994 console_driver->major = TTY_MAJOR;
2995 console_driver->minor_start = 1;
2996 console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2997 console_driver->init_termios = tty_std_termios;
c1236d31
ST		 2998 if (default_utf8)
2999 console_driver->init_termios.c_iflag |= IUTF8;
1da177e4
LT		 3000 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3001 tty_set_operations(console_driver, &con_ops);
3002 if (tty_register_driver(console_driver))
3003 panic("Couldn't register console driver\n");
1da177e4
LT		 3004 kbd_init();
3005 console_map_init();
1da177e4
LT		 3006#ifdef CONFIG_MDA_CONSOLE
3007 mda_console_init();
3008#endif
3009 return 0;
3010}
3011
3012#ifndef VT_SINGLE_DRIVER
6db4063c
AD		 3013
3014static struct class *vtconsole_class;
3015
b7269dd2
JB		 3016static int bind_con_driver(const struct consw *csw, int first, int last,
3017 int deflt)
1da177e4 3018{
3e795de7
AD		 3019 struct module *owner = csw->owner;
3020 const char *desc = NULL;
3021 struct con_driver *con_driver;
3022 int i, j = -1, k = -1, retval = -ENODEV;
1da177e4 3023
1da177e4
LT		 3024 if (!try_module_get(owner))
3025 return -ENODEV;
3026
ac751efa 3027 console_lock();
1c8ce271 3028
3e795de7
AD		 3029 /* check if driver is registered */
3030 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3031 con_driver = &registered_con_driver[i];
3032
3033 if (con_driver->con == csw) {
3034 desc = con_driver->desc;
3035 retval = 0;
3036 break;
3037 }
3038 }
3039
3040 if (retval)
3041 goto err;
3042
3043 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3044 csw->con_startup();
3045 con_driver->flag |= CON_DRIVER_FLAG_INIT;
1da177e4 3046 }
1c8ce271 3047
1da177e4
LT		 3048 if (deflt) {
3049 if (conswitchp)
3050 module_put(conswitchp->owner);
1c8ce271 3051
1da177e4
LT		 3052 __module_get(owner);
3053 conswitchp = csw;
3054 }
3055
3e795de7
AD		 3056 first = max(first, con_driver->first);
3057 last = min(last, con_driver->last);
3058
1da177e4
LT		 3059 for (i = first; i <= last; i++) {
3060 int old_was_color;
3061 struct vc_data *vc = vc_cons[i].d;
3062
3063 if (con_driver_map[i])
3064 module_put(con_driver_map[i]->owner);
3065 __module_get(owner);
3066 con_driver_map[i] = csw;
3067
3068 if (!vc || !vc->vc_sw)
3069 continue;
3070
3071 j = i;
1c8ce271 3072
4ee1acce
DH		 3073 if (CON_IS_VISIBLE(vc)) {
3074 k = i;
1da177e4 3075 save_screen(vc);
4ee1acce
DH		 3076 }
3077
1da177e4
LT		 3078 old_was_color = vc->vc_can_do_color;
3079 vc->vc_sw->con_deinit(vc);
9fc2b2d0 3080 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
1da177e4 3081 visual_init(vc, i, 0);
1c8ce271 3082 set_origin(vc);
1da177e4
LT		 3083 update_attr(vc);
3084
3085 /* If the console changed between mono <-> color, then
3086 * the attributes in the screenbuf will be wrong. The
3087 * following resets all attributes to something sane.
3088 */
3089 if (old_was_color != vc->vc_can_do_color)
3090 clear_buffer_attributes(vc);
1da177e4 3091 }
4ee1acce 3092
1ffdda95 3093 pr_info("Console: switching ");
1da177e4
LT		 3094 if (!deflt)
3095 printk("consoles %d-%d ", first+1, last+1);
4ee1acce
DH		 3096 if (j >= 0) {
3097 struct vc_data *vc = vc_cons[j].d;
3098
1da177e4 3099 printk("to %s %s %dx%d\n",
4ee1acce
DH		 3100 vc->vc_can_do_color ? "colour" : "mono",
3101 desc, vc->vc_cols, vc->vc_rows);
3102
3103 if (k >= 0) {
3104 vc = vc_cons[k].d;
3105 update_screen(vc);
3106 }
3107 } else
1da177e4
LT		 3108 printk("to %s\n", desc);
3109
3e795de7
AD		 3110 retval = 0;
3111err:
ac751efa 3112 console_unlock();
1da177e4 3113 module_put(owner);
3e795de7
AD		 3114 return retval;
3115};
1da177e4 3116
13ae6645
AD		 3117#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3118static int con_is_graphics(const struct consw *csw, int first, int last)
3119{
3120 int i, retval = 0;
3121
3122 for (i = first; i <= last; i++) {
3123 struct vc_data *vc = vc_cons[i].d;
3124
3125 if (vc && vc->vc_mode == KD_GRAPHICS) {
3126 retval = 1;
3127 break;
3128 }
3129 }
3130
3131 return retval;
3132}
3133
b7269dd2
JB		 3134/**
3135 * unbind_con_driver - unbind a console driver
3136 * @csw: pointer to console driver to unregister
3137 * @first: first in range of consoles that @csw should be unbound from
3138 * @last: last in range of consoles that @csw should be unbound from
3139 * @deflt: should next bound console driver be default after @csw is unbound?
3140 *
3141 * To unbind a driver from all possible consoles, pass 0 as @first and
3142 * %MAX_NR_CONSOLES as @last.
3143 *
3144 * @deflt controls whether the console that ends up replacing @csw should be
3145 * the default console.
3146 *
3147 * RETURNS:
3148 * -ENODEV if @csw isn't a registered console driver or can't be unregistered
3149 * or 0 on success.
3150 */
623e71b0 3151int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
1da177e4 3152{
3e795de7
AD		 3153 struct module *owner = csw->owner;
3154 const struct consw *defcsw = NULL;
3155 struct con_driver *con_driver = NULL, *con_back = NULL;
3156 int i, retval = -ENODEV;
1da177e4 3157
3e795de7
AD		 3158 if (!try_module_get(owner))
3159 return -ENODEV;
3160
ac751efa 3161 console_lock();
3e795de7
AD		 3162
3163 /* check if driver is registered and if it is unbindable */
3164 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3165 con_driver = &registered_con_driver[i];
3166
3167 if (con_driver->con == csw &&
6db4063c 3168 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3e795de7
AD		 3169 retval = 0;
3170 break;
3171 }
3172 }
3173
3174 if (retval) {
ac751efa 3175 console_unlock();
3e795de7
AD		 3176 goto err;
3177 }
3178
6db4063c
AD		 3179 retval = -ENODEV;
3180
3e795de7
AD		 3181 /* check if backup driver exists */
3182 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3183 con_back = &registered_con_driver[i];
3184
3185 if (con_back->con &&
6db4063c 3186 !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3e795de7
AD		 3187 defcsw = con_back->con;
3188 retval = 0;
3189 break;
3190 }
3191 }
3192
3193 if (retval) {
ac751efa 3194 console_unlock();
3e795de7
AD		 3195 goto err;
3196 }
3197
3198 if (!con_is_bound(csw)) {
ac751efa 3199 console_unlock();
3e795de7
AD		 3200 goto err;
3201 }
3202
3203 first = max(first, con_driver->first);
3204 last = min(last, con_driver->last);
3205
3206 for (i = first; i <= last; i++) {
1da177e4
LT		 3207 if (con_driver_map[i] == csw) {
3208 module_put(csw->owner);
3209 con_driver_map[i] = NULL;
3210 }
3e795de7
AD		 3211 }
3212
3213 if (!con_is_bound(defcsw)) {
6db4063c
AD		 3214 const struct consw *defconsw = conswitchp;
3215
3e795de7
AD		 3216 defcsw->con_startup();
3217 con_back->flag |= CON_DRIVER_FLAG_INIT;
6db4063c
AD		 3218 /*
3219 * vgacon may change the default driver to point
3220 * to dummycon, we restore it here...
3221 */
3222 conswitchp = defconsw;
3e795de7
AD		 3223 }
3224
3225 if (!con_is_bound(csw))
3226 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3227
ac751efa 3228 console_unlock();
6db4063c
AD		 3229 /* ignore return value, binding should not fail */
3230 bind_con_driver(defcsw, first, last, deflt);
3e795de7
AD		 3231err:
3232 module_put(owner);
3233 return retval;
3234
3235}
623e71b0 3236EXPORT_SYMBOL(unbind_con_driver);
3e795de7 3237
6db4063c
AD		 3238static int vt_bind(struct con_driver *con)
3239{
3240 const struct consw *defcsw = NULL, *csw = NULL;
3241 int i, more = 1, first = -1, last = -1, deflt = 0;
3242
3243 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3244 con_is_graphics(con->con, con->first, con->last))
3245 goto err;
3246
3247 csw = con->con;
3248
3249 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3250 struct con_driver *con = &registered_con_driver[i];
3251
3252 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3253 defcsw = con->con;
3254 break;
3255 }
3256 }
3257
3258 if (!defcsw)
3259 goto err;
3260
3261 while (more) {
3262 more = 0;
3263
3264 for (i = con->first; i <= con->last; i++) {
3265 if (con_driver_map[i] == defcsw) {
3266 if (first == -1)
3267 first = i;
3268 last = i;
3269 more = 1;
3270 } else if (first != -1)
3271 break;
3272 }
3273
3274 if (first == 0 && last == MAX_NR_CONSOLES -1)
3275 deflt = 1;
3276
3277 if (first != -1)
3278 bind_con_driver(csw, first, last, deflt);
3279
3280 first = -1;
3281 last = -1;
3282 deflt = 0;
3283 }
3284
3285err:
3286 return 0;
3287}
3288
3289static int vt_unbind(struct con_driver *con)
3290{
3291 const struct consw *csw = NULL;
3292 int i, more = 1, first = -1, last = -1, deflt = 0;
3293
3294 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3295 con_is_graphics(con->con, con->first, con->last))
3296 goto err;
3297
3298 csw = con->con;
3299
3300 while (more) {
3301 more = 0;
3302
3303 for (i = con->first; i <= con->last; i++) {
3304 if (con_driver_map[i] == csw) {
3305 if (first == -1)
3306 first = i;
3307 last = i;
3308 more = 1;
3309 } else if (first != -1)
3310 break;
3311 }
3312
3313 if (first == 0 && last == MAX_NR_CONSOLES -1)
3314 deflt = 1;
3315
3316 if (first != -1)
3317 unbind_con_driver(csw, first, last, deflt);
3318
3319 first = -1;
3320 last = -1;
3321 deflt = 0;
3322 }
3323
3324err:
3325 return 0;
3326}
13ae6645
AD		 3327#else
3328static inline int vt_bind(struct con_driver *con)
3329{
3330 return 0;
3331}
3332static inline int vt_unbind(struct con_driver *con)
3333{
3334 return 0;
3335}
3336#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
6db4063c 3337
805952a8 3338static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
6db4063c
AD		 3339 const char *buf, size_t count)
3340{
805952a8 3341 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3342 int bind = simple_strtoul(buf, NULL, 0);
3343
3344 if (bind)
3345 vt_bind(con);
3346 else
3347 vt_unbind(con);
3348
3349 return count;
3350}
3351
805952a8
GKH		 3352static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3353 char *buf)
6db4063c 3354{
805952a8 3355 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3356 int bind = con_is_bound(con->con);
3357
3358 return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3359}
3360
805952a8
GKH		 3361static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3362 char *buf)
6db4063c 3363{
805952a8 3364 struct con_driver *con = dev_get_drvdata(dev);
6db4063c
AD		 3365
3366 return snprintf(buf, PAGE_SIZE, "%s %s\n",
3367 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3368 con->desc);
3369
3370}
3371
805952a8 3372static struct device_attribute device_attrs[] = {
6db4063c
AD		 3373 __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3374 __ATTR(name, S_IRUGO, show_name, NULL),
3375};
3376
805952a8 3377static int vtconsole_init_device(struct con_driver *con)
6db4063c
AD		 3378{
3379 int i;
928e964f 3380 int error = 0;
6db4063c 3381
928e964f 3382 con->flag |= CON_DRIVER_FLAG_ATTR;
805952a8
GKH		 3383 dev_set_drvdata(con->dev, con);
3384 for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3385 error = device_create_file(con->dev, &device_attrs[i]);
928e964f
AD		 3386 if (error)
3387 break;
3388 }
6db4063c 3389
928e964f
AD		 3390 if (error) {
3391 while (--i >= 0)
805952a8 3392 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3393 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3394 }
3395
3396 return error;
6db4063c
AD		 3397}
3398
805952a8 3399static void vtconsole_deinit_device(struct con_driver *con)
6db4063c
AD		 3400{
3401 int i;
3402
928e964f 3403 if (con->flag & CON_DRIVER_FLAG_ATTR) {
805952a8
GKH		 3404 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3405 device_remove_file(con->dev, &device_attrs[i]);
928e964f
AD		 3406 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3407 }
6db4063c
AD		 3408}
3409
3e795de7
AD		 3410/**
3411 * con_is_bound - checks if driver is bound to the console
3412 * @csw: console driver
3413 *
3414 * RETURNS: zero if unbound, nonzero if bound
3415 *
3416 * Drivers can call this and if zero, they should release
3417 * all resources allocated on con_startup()
3418 */
3419int con_is_bound(const struct consw *csw)
3420{
3421 int i, bound = 0;
3422
3423 for (i = 0; i < MAX_NR_CONSOLES; i++) {
3424 if (con_driver_map[i] == csw) {
3425 bound = 1;
3426 break;
3427 }
3428 }
3429
3430 return bound;
3431}
3432EXPORT_SYMBOL(con_is_bound);
3433
b45cfba4
JB		 3434/**
3435 * con_debug_enter - prepare the console for the kernel debugger
3436 * @sw: console driver
3437 *
3438 * Called when the console is taken over by the kernel debugger, this
3439 * function needs to save the current console state, then put the console
3440 * into a state suitable for the kernel debugger.
3441 *
3442 * RETURNS:
3443 * Zero on success, nonzero if a failure occurred when trying to prepare
3444 * the console for the debugger.
3445 */
3446int con_debug_enter(struct vc_data *vc)
3447{
3448 int ret = 0;
3449
3450 saved_fg_console = fg_console;
3451 saved_last_console = last_console;
3452 saved_want_console = want_console;
3453 saved_vc_mode = vc->vc_mode;
beed5336 3454 saved_console_blanked = console_blanked;
b45cfba4
JB		 3455 vc->vc_mode = KD_TEXT;
3456 console_blanked = 0;
3457 if (vc->vc_sw->con_debug_enter)
3458 ret = vc->vc_sw->con_debug_enter(vc);
81d44507
JW		 3459#ifdef CONFIG_KGDB_KDB
3460 /* Set the initial LINES variable if it is not already set */
3461 if (vc->vc_rows < 999) {
3462 int linecount;
3463 char lns[4];
3464 const char *setargs[3] = {
3465 "set",
3466 "LINES",
3467 lns,
3468 };
3469 if (kdbgetintenv(setargs[0], &linecount)) {
3470 snprintf(lns, 4, "%i", vc->vc_rows);
3471 kdb_set(2, setargs);
3472 }
3473 }
3474#endif /* CONFIG_KGDB_KDB */
b45cfba4
JB		 3475 return ret;
3476}
3477EXPORT_SYMBOL_GPL(con_debug_enter);
3478
3479/**
3480 * con_debug_leave - restore console state
3481 * @sw: console driver
3482 *
3483 * Restore the console state to what it was before the kernel debugger
3484 * was invoked.
3485 *
3486 * RETURNS:
3487 * Zero on success, nonzero if a failure occurred when trying to restore
3488 * the console.
3489 */
3490int con_debug_leave(void)
3491{
3492 struct vc_data *vc;
3493 int ret = 0;
3494
3495 fg_console = saved_fg_console;
3496 last_console = saved_last_console;
3497 want_console = saved_want_console;
beed5336 3498 console_blanked = saved_console_blanked;
b45cfba4
JB		 3499 vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3500
3501 vc = vc_cons[fg_console].d;
3502 if (vc->vc_sw->con_debug_leave)
3503 ret = vc->vc_sw->con_debug_leave(vc);
3504 return ret;
3505}
3506EXPORT_SYMBOL_GPL(con_debug_leave);
3507
3e795de7
AD		 3508/**
3509 * register_con_driver - register console driver to console layer
3510 * @csw: console driver
3511 * @first: the first console to take over, minimum value is 0
3512 * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
3513 *
3514 * DESCRIPTION: This function registers a console driver which can later
3515 * bind to a range of consoles specified by @first and @last. It will
3516 * also initialize the console driver by calling con_startup().
3517 */
3518int register_con_driver(const struct consw *csw, int first, int last)
3519{
3520 struct module *owner = csw->owner;
3521 struct con_driver *con_driver;
3522 const char *desc;
3523 int i, retval = 0;
3524
3525 if (!try_module_get(owner))
3526 return -ENODEV;
3527
ac751efa 3528 console_lock();
3e795de7
AD		 3529
3530 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3531 con_driver = &registered_con_driver[i];
3532
3533 /* already registered */
3534 if (con_driver->con == csw)
c55c63c6 3535 retval = -EBUSY;
3e795de7
AD		 3536 }
3537
3538 if (retval)
3539 goto err;
3540
3541 desc = csw->con_startup();
3542
3543 if (!desc)
3544 goto err;
3545
3546 retval = -EINVAL;
3547
3548 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3549 con_driver = &registered_con_driver[i];
3550
3551 if (con_driver->con == NULL) {
3552 con_driver->con = csw;
3553 con_driver->desc = desc;
6db4063c
AD		 3554 con_driver->node = i;
3555 con_driver->flag = CON_DRIVER_FLAG_MODULE |
3e795de7
AD		 3556 CON_DRIVER_FLAG_INIT;
3557 con_driver->first = first;
3558 con_driver->last = last;
3559 retval = 0;
3560 break;
3561 }
3562 }
3563
6db4063c
AD		 3564 if (retval)
3565 goto err;
3566
d81ed103 3567 con_driver->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3568 MKDEV(0, con_driver->node),
3569 NULL, "vtcon%i",
3570 con_driver->node);
6db4063c 3571
805952a8
GKH		 3572 if (IS_ERR(con_driver->dev)) {
3573 printk(KERN_WARNING "Unable to create device for %s; "
6db4063c 3574 "errno = %ld\n", con_driver->desc,
805952a8
GKH		 3575 PTR_ERR(con_driver->dev));
3576 con_driver->dev = NULL;
6db4063c 3577 } else {
805952a8 3578 vtconsole_init_device(con_driver);
6db4063c 3579 }
928e964f 3580
3e795de7 3581err:
ac751efa 3582 console_unlock();
3e795de7
AD		 3583 module_put(owner);
3584 return retval;
3585}
3586EXPORT_SYMBOL(register_con_driver);
3587
3588/**
3589 * unregister_con_driver - unregister console driver from console layer
3590 * @csw: console driver
3591 *
3592 * DESCRIPTION: All drivers that registers to the console layer must
3593 * call this function upon exit, or if the console driver is in a state
3594 * where it won't be able to handle console services, such as the
3595 * framebuffer console without loaded framebuffer drivers.
3596 *
3597 * The driver must unbind first prior to unregistration.
3598 */
3599int unregister_con_driver(const struct consw *csw)
3600{
3601 int i, retval = -ENODEV;
3602
ac751efa 3603 console_lock();
3e795de7
AD		 3604
3605 /* cannot unregister a bound driver */
3606 if (con_is_bound(csw))
3607 goto err;
3608
3609 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3610 struct con_driver *con_driver = &registered_con_driver[i];
3611
3612 if (con_driver->con == csw &&
6db4063c 3613 con_driver->flag & CON_DRIVER_FLAG_MODULE) {
805952a8
GKH		 3614 vtconsole_deinit_device(con_driver);
3615 device_destroy(vtconsole_class,
3616 MKDEV(0, con_driver->node));
3e795de7
AD		 3617 con_driver->con = NULL;
3618 con_driver->desc = NULL;
805952a8 3619 con_driver->dev = NULL;
6db4063c 3620 con_driver->node = 0;
3e795de7
AD		 3621 con_driver->flag = 0;
3622 con_driver->first = 0;
3623 con_driver->last = 0;
3624 retval = 0;
3625 break;
3626 }
3627 }
3e795de7 3628err:
ac751efa 3629 console_unlock();
3e795de7
AD		 3630 return retval;
3631}
3632EXPORT_SYMBOL(unregister_con_driver);
3633
3634/*
3635 * If we support more console drivers, this function is used
3636 * when a driver wants to take over some existing consoles
3637 * and become default driver for newly opened ones.
3638 *
3639 * take_over_console is basically a register followed by unbind
3640 */
3641int take_over_console(const struct consw *csw, int first, int last, int deflt)
3642{
3643 int err;
3644
3645 err = register_con_driver(csw, first, last);
c55c63c6
DA		 3646 /* if we get an busy error we still want to bind the console driver
3647 * and return success, as we may have unbound the console driver
3648  * but not unregistered it.
3649 */
3650 if (err == -EBUSY)
3651 err = 0;
3e795de7 3652 if (!err)
6db4063c 3653 bind_con_driver(csw, first, last, deflt);
3e795de7
AD		 3654
3655 return err;
3656}
3657
3658/*
3659 * give_up_console is a wrapper to unregister_con_driver. It will only
3660 * work if driver is fully unbound.
3661 */
3662void give_up_console(const struct consw *csw)
3663{
3664 unregister_con_driver(csw);
3665}
3666
6db4063c 3667static int __init vtconsole_class_init(void)
3e795de7 3668{
6db4063c 3669 int i;
3e795de7 3670
6db4063c
AD		 3671 vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3672 if (IS_ERR(vtconsole_class)) {
3673 printk(KERN_WARNING "Unable to create vt console class; "
3674 "errno = %ld\n", PTR_ERR(vtconsole_class));
3675 vtconsole_class = NULL;
3676 }
3e795de7 3677
6db4063c 3678 /* Add system drivers to sysfs */
3e795de7
AD		 3679 for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3680 struct con_driver *con = &registered_con_driver[i];
3681
805952a8 3682 if (con->con && !con->dev) {
d81ed103 3683 con->dev = device_create(vtconsole_class, NULL,
47aa5793
GKH		 3684 MKDEV(0, con->node),
3685 NULL, "vtcon%i",
3686 con->node);
6db4063c 3687
805952a8 3688 if (IS_ERR(con->dev)) {
6db4063c 3689 printk(KERN_WARNING "Unable to create "
805952a8
GKH		 3690 "device for %s; errno = %ld\n",
3691 con->desc, PTR_ERR(con->dev));
3692 con->dev = NULL;
6db4063c 3693 } else {
805952a8 3694 vtconsole_init_device(con);
6db4063c 3695 }
3e795de7 3696 }
3e795de7
AD		 3697 }
3698
3e795de7
AD		 3699 return 0;
3700}
6db4063c 3701postcore_initcall(vtconsole_class_init);
3e795de7 3702
1da177e4
LT		 3703#endif
3704
3705/*
3706 * Screen blanking
3707 */
3708
403aac96 3709static int set_vesa_blanking(char __user *p)
1da177e4 3710{
403aac96
YY		 3711 unsigned int mode;
3712
3713 if (get_user(mode, p + 1))
3714 return -EFAULT;
3715
3716 vesa_blank_mode = (mode < 4) ? mode : 0;
3717 return 0;
1da177e4
LT		 3718}
3719
1da177e4
LT		 3720void do_blank_screen(int entering_gfx)
3721{
3722 struct vc_data *vc = vc_cons[fg_console].d;
3723 int i;
3724
3725 WARN_CONSOLE_UNLOCKED();
3726
3727 if (console_blanked) {
3728 if (blank_state == blank_vesa_wait) {
3729 blank_state = blank_off;
d060a321 3730 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
1da177e4
LT		 3731 }
3732 return;
3733 }
1da177e4
LT		 3734
3735 /* entering graphics mode? */
3736 if (entering_gfx) {
3737 hide_cursor(vc);
3738 save_screen(vc);
3739 vc->vc_sw->con_blank(vc, -1, 1);
3740 console_blanked = fg_console + 1;
b6e8f00f 3741 blank_state = blank_off;
1da177e4
LT		 3742 set_origin(vc);
3743 return;
3744 }
3745
b6e8f00f 3746 if (blank_state != blank_normal_wait)
3747 return;
3748 blank_state = blank_off;
3749
1da177e4
LT		 3750 /* don't blank graphics */
3751 if (vc->vc_mode != KD_TEXT) {
3752 console_blanked = fg_console + 1;
3753 return;
3754 }
3755
3756 hide_cursor(vc);
3757 del_timer_sync(&console_timer);
3758 blank_timer_expired = 0;
3759
3760 save_screen(vc);
3761 /* In case we need to reset origin, blanking hook returns 1 */
d060a321 3762 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
1da177e4
LT		 3763 console_blanked = fg_console + 1;
3764 if (i)
3765 set_origin(vc);
3766
3767 if (console_blank_hook && console_blank_hook(1))
3768 return;
3769
d060a321 3770 if (vesa_off_interval && vesa_blank_mode) {
030babac 3771 blank_state = blank_vesa_wait;
1da177e4
LT		 3772 mod_timer(&console_timer, jiffies + vesa_off_interval);
3773 }
8b92e87d 3774 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3775}
3776EXPORT_SYMBOL(do_blank_screen);
3777
3778/*
3779 * Called by timer as well as from vt_console_driver
3780 */
3781void do_unblank_screen(int leaving_gfx)
3782{
3783 struct vc_data *vc;
3784
3785 /* This should now always be called from a "sane" (read: can schedule)
3786 * context for the sake of the low level drivers, except in the special
3787 * case of oops_in_progress
3788 */
3789 if (!oops_in_progress)
3790 might_sleep();
3791
3792 WARN_CONSOLE_UNLOCKED();
3793
3794 ignore_poke = 0;
3795 if (!console_blanked)
3796 return;
3797 if (!vc_cons_allocated(fg_console)) {
3798 /* impossible */
1ffdda95
MSB		 3799 pr_warning("unblank_screen: tty %d not allocated ??\n",
3800 fg_console+1);
1da177e4
LT		 3801 return;
3802 }
3803 vc = vc_cons[fg_console].d;
8fd4bd22
JB		 3804 /* Try to unblank in oops case too */
3805 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
1da177e4
LT		 3806 return; /* but leave console_blanked != 0 */
3807
3808 if (blankinterval) {
f324edc8 3809 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3810 blank_state = blank_normal_wait;
3811 }
3812
3813 console_blanked = 0;
8fd4bd22 3814 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
1da177e4
LT		 3815 /* Low-level driver cannot restore -> do it ourselves */
3816 update_screen(vc);
3817 if (console_blank_hook)
3818 console_blank_hook(0);
3819 set_palette(vc);
3820 set_cursor(vc);
8b92e87d 3821 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
1da177e4
LT		 3822}
3823EXPORT_SYMBOL(do_unblank_screen);
3824
3825/*
3826 * This is called by the outside world to cause a forced unblank, mostly for
3827 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3828 * call it with 1 as an argument and so force a mode restore... that may kill
3829 * X or at least garbage the screen but would also make the Oops visible...
3830 */
3831void unblank_screen(void)
3832{
3833 do_unblank_screen(0);
3834}
3835
3836/*
70522e12 3837 * We defer the timer blanking to work queue so it can take the console mutex
1da177e4 3838 * (console operations can still happen at irq time, but only from printk which
70522e12 3839 * has the console mutex. Not perfect yet, but better than no locking
1da177e4
LT		 3840 */
3841static void blank_screen_t(unsigned long dummy)
3842{
cc63b1e1 3843 if (unlikely(!keventd_up())) {
f324edc8 3844 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
cc63b1e1
JB		 3845 return;
3846 }
1da177e4
LT		 3847 blank_timer_expired = 1;
3848 schedule_work(&console_work);
3849}
3850
3851void poke_blanked_console(void)
3852{
3853 WARN_CONSOLE_UNLOCKED();
3854
3855 /* Add this so we quickly catch whoever might call us in a non
3856 * safe context. Nowadays, unblank_screen() isn't to be called in
3857 * atomic contexts and is allowed to schedule (with the special case
3858 * of oops_in_progress, but that isn't of any concern for this
3859 * function. --BenH.
3860 */
3861 might_sleep();
3862
3863 /* This isn't perfectly race free, but a race here would be mostly harmless,
3864 * at worse, we'll do a spurrious blank and it's unlikely
3865 */
3866 del_timer(&console_timer);
3867 blank_timer_expired = 0;
3868
3869 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3870 return;
3871 if (console_blanked)
3872 unblank_screen();
3873 else if (blankinterval) {
f324edc8 3874 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
1da177e4
LT		 3875 blank_state = blank_normal_wait;
3876 }
3877}
3878
3879/*
3880 * Palettes
3881 */
3882
3883static void set_palette(struct vc_data *vc)
3884{
3885 WARN_CONSOLE_UNLOCKED();
3886
3887 if (vc->vc_mode != KD_GRAPHICS)
3888 vc->vc_sw->con_set_palette(vc, color_table);
3889}
3890
3891static int set_get_cmap(unsigned char __user *arg, int set)
3892{
3893 int i, j, k;
3894
3895 WARN_CONSOLE_UNLOCKED();
3896
3897 for (i = 0; i < 16; i++)
3898 if (set) {
3899 get_user(default_red[i], arg++);
3900 get_user(default_grn[i], arg++);
3901 get_user(default_blu[i], arg++);
3902 } else {
3903 put_user(default_red[i], arg++);
3904 put_user(default_grn[i], arg++);
3905 put_user(default_blu[i], arg++);
3906 }
3907 if (set) {
3908 for (i = 0; i < MAX_NR_CONSOLES; i++)
3909 if (vc_cons_allocated(i)) {
3910 for (j = k = 0; j < 16; j++) {
3911 vc_cons[i].d->vc_palette[k++] = default_red[j];
3912 vc_cons[i].d->vc_palette[k++] = default_grn[j];
3913 vc_cons[i].d->vc_palette[k++] = default_blu[j];
3914 }
3915 set_palette(vc_cons[i].d);
3916 }
3917 }
3918 return 0;
3919}
3920
3921/*
3922 * Load palette into the DAC registers. arg points to a colour
3923 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3924 */
3925
3926int con_set_cmap(unsigned char __user *arg)
3927{
3928 int rc;
3929
ac751efa 3930 console_lock();
1da177e4 3931 rc = set_get_cmap (arg,1);
ac751efa 3932 console_unlock();
1da177e4
LT		 3933
3934 return rc;
3935}
3936
3937int con_get_cmap(unsigned char __user *arg)
3938{
3939 int rc;
3940
ac751efa 3941 console_lock();
1da177e4 3942 rc = set_get_cmap (arg,0);
ac751efa 3943 console_unlock();
1da177e4
LT		 3944
3945 return rc;
3946}
3947
3948void reset_palette(struct vc_data *vc)
3949{
3950 int j, k;
3951 for (j=k=0; j<16; j++) {
3952 vc->vc_palette[k++] = default_red[j];
3953 vc->vc_palette[k++] = default_grn[j];
3954 vc->vc_palette[k++] = default_blu[j];
3955 }
3956 set_palette(vc);
3957}
3958
3959/*
3960 * Font switching
3961 *
3962 * Currently we only support fonts up to 32 pixels wide, at a maximum height
3963 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3964 * depending on width) reserved for each character which is kinda wasty, but
3965 * this is done in order to maintain compatibility with the EGA/VGA fonts. It
25985edc 3966 * is up to the actual low-level console-driver convert data into its favorite
1da177e4
LT		 3967 * format (maybe we should add a `fontoffset' field to the `display'
3968 * structure so we won't have to convert the fontdata all the time.
3969 * /Jes
3970 */
3971
3972#define max_font_size 65536
3973
3974static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3975{
3976 struct console_font font;
3977 int rc = -EINVAL;
3978 int c;
3979
3980 if (vc->vc_mode != KD_TEXT)
3981 return -EINVAL;
3982
3983 if (op->data) {
3984 font.data = kmalloc(max_font_size, GFP_KERNEL);
3985 if (!font.data)
3986 return -ENOMEM;
3987 } else
3988 font.data = NULL;
3989
ac751efa 3990 console_lock();
1da177e4
LT		 3991 if (vc->vc_sw->con_font_get)
3992 rc = vc->vc_sw->con_font_get(vc, &font);
3993 else
3994 rc = -ENOSYS;
ac751efa 3995 console_unlock();
1da177e4
LT		 3996
3997 if (rc)
3998 goto out;
3999
4000 c = (font.width+7)/8 * 32 * font.charcount;
04f378b1 4001
1da177e4
LT		 4002 if (op->data && font.charcount > op->charcount)
4003 rc = -ENOSPC;
4004 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4005 if (font.width > op->width || font.height > op->height)
4006 rc = -ENOSPC;
4007 } else {
4008 if (font.width != 8)
4009 rc = -EIO;
4010 else if ((op->height && font.height > op->height) ||
4011 font.height > 32)
4012 rc = -ENOSPC;
4013 }
4014 if (rc)
4015 goto out;
4016
4017 op->height = font.height;
4018 op->width = font.width;
4019 op->charcount = font.charcount;
4020
4021 if (op->data && copy_to_user(op->data, font.data, c))
4022 rc = -EFAULT;
4023
4024out:
4025 kfree(font.data);
4026 return rc;
4027}
4028
4029static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4030{
4031 struct console_font font;
4032 int rc = -EINVAL;
4033 int size;
4034
4035 if (vc->vc_mode != KD_TEXT)
4036 return -EINVAL;
4037 if (!op->data)
4038 return -EINVAL;
4039 if (op->charcount > 512)
4040 return -EINVAL;
4041 if (!op->height) { /* Need to guess font height [compat] */
4042 int h, i;
4043 u8 __user *charmap = op->data;
4044 u8 tmp;
4045
4046 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4047 so that we can get rid of this soon */
4048 if (!(op->flags & KD_FONT_FLAG_OLD))
4049 return -EINVAL;
4050 for (h = 32; h > 0; h--)
4051 for (i = 0; i < op->charcount; i++) {
4052 if (get_user(tmp, &charmap[32*i+h-1]))
4053 return -EFAULT;
4054 if (tmp)
4055 goto nonzero;
4056 }
4057 return -EINVAL;
4058 nonzero:
4059 op->height = h;
4060 }
4061 if (op->width <= 0 || op->width > 32 || op->height > 32)
4062 return -EINVAL;
4063 size = (op->width+7)/8 * 32 * op->charcount;
4064 if (size > max_font_size)
4065 return -ENOSPC;
4066 font.charcount = op->charcount;
4067 font.height = op->height;
4068 font.width = op->width;
9b71ca20
JL		 4069 font.data = memdup_user(op->data, size);
4070 if (IS_ERR(font.data))
4071 return PTR_ERR(font.data);
ac751efa 4072 console_lock();
1da177e4
LT		 4073 if (vc->vc_sw->con_font_set)
4074 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4075 else
4076 rc = -ENOSYS;
ac751efa 4077 console_unlock();
1da177e4
LT		 4078 kfree(font.data);
4079 return rc;
4080}
4081
4082static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4083{
4084 struct console_font font = {.width = op->width, .height = op->height};
4085 char name[MAX_FONT_NAME];
4086 char *s = name;
4087 int rc;
4088
4089 if (vc->vc_mode != KD_TEXT)
4090 return -EINVAL;
4091
4092 if (!op->data)
4093 s = NULL;
4094 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4095 return -EFAULT;
4096 else
4097 name[MAX_FONT_NAME - 1] = 0;
4098
ac751efa 4099 console_lock();
1da177e4
LT		 4100 if (vc->vc_sw->con_font_default)
4101 rc = vc->vc_sw->con_font_default(vc, &font, s);
4102 else
4103 rc = -ENOSYS;
ac751efa 4104 console_unlock();
1da177e4
LT		 4105 if (!rc) {
4106 op->width = font.width;
4107 op->height = font.height;
4108 }
4109 return rc;
4110}
4111
4112static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4113{
4114 int con = op->height;
4115 int rc;
4116
4117 if (vc->vc_mode != KD_TEXT)
4118 return -EINVAL;
4119
ac751efa 4120 console_lock();
1da177e4
LT		 4121 if (!vc->vc_sw->con_font_copy)
4122 rc = -ENOSYS;
4123 else if (con < 0 || !vc_cons_allocated(con))
4124 rc = -ENOTTY;
4125 else if (con == vc->vc_num) /* nothing to do */
4126 rc = 0;
4127 else
4128 rc = vc->vc_sw->con_font_copy(vc, con);
ac751efa 4129 console_unlock();
1da177e4
LT		 4130 return rc;
4131}
4132
4133int con_font_op(struct vc_data *vc, struct console_font_op *op)
4134{
4135 switch (op->op) {
4136 case KD_FONT_OP_SET:
4137 return con_font_set(vc, op);
4138 case KD_FONT_OP_GET:
4139 return con_font_get(vc, op);
4140 case KD_FONT_OP_SET_DEFAULT:
4141 return con_font_default(vc, op);
4142 case KD_FONT_OP_COPY:
4143 return con_font_copy(vc, op);
4144 }
4145 return -ENOSYS;
4146}
4147
4148/*
4149 * Interface exported to selection and vcs.
4150 */
4151
4152/* used by selection */
4153u16 screen_glyph(struct vc_data *vc, int offset)
4154{
4155 u16 w = scr_readw(screenpos(vc, offset, 1));
4156 u16 c = w & 0xff;
4157
4158 if (w & vc->vc_hi_font_mask)
4159 c |= 0x100;
4160 return c;
4161}
f7511d5f 4162EXPORT_SYMBOL_GPL(screen_glyph);
1da177e4
LT		 4163
4164/* used by vcs - note the word offset */
4165unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4166{
4167 return screenpos(vc, 2 * w_offset, viewed);
4168}
4169
4170void getconsxy(struct vc_data *vc, unsigned char *p)
4171{
4172 p[0] = vc->vc_x;
4173 p[1] = vc->vc_y;
4174}
4175
4176void putconsxy(struct vc_data *vc, unsigned char *p)
4177{
9477e260 4178 hide_cursor(vc);
1da177e4
LT		 4179 gotoxy(vc, p[0], p[1]);
4180 set_cursor(vc);
4181}
4182
4183u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4184{
4185 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4186 return softcursor_original;
4187 return scr_readw(org);
4188}
4189
4190void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4191{
4192 scr_writew(val, org);
4193 if ((unsigned long)org == vc->vc_pos) {
4194 softcursor_original = -1;
4195 add_softcursor(vc);
4196 }
4197}
4198
432c9ed2
NP		 4199void vcs_scr_updated(struct vc_data *vc)
4200{
4201 notify_update(vc);
4202}
4203
1da177e4
LT		 4204/*
4205 * Visible symbols for modules
4206 */
4207
4208EXPORT_SYMBOL(color_table);
4209EXPORT_SYMBOL(default_red);
4210EXPORT_SYMBOL(default_grn);
4211EXPORT_SYMBOL(default_blu);
4212EXPORT_SYMBOL(update_region);
4213EXPORT_SYMBOL(redraw_screen);
4214EXPORT_SYMBOL(vc_resize);
4215EXPORT_SYMBOL(fg_console);
4216EXPORT_SYMBOL(console_blank_hook);
4217EXPORT_SYMBOL(console_blanked);
4218EXPORT_SYMBOL(vc_cons);
f6c06b68 4219EXPORT_SYMBOL(global_cursor_default);
1da177e4
LT		 4220#ifndef VT_SINGLE_DRIVER
4221EXPORT_SYMBOL(take_over_console);
4222EXPORT_SYMBOL(give_up_console);
4223#endif
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